Note: Descriptions are shown in the official language in which they were submitted.
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A METHOD OF EJECTING A MOLDED ARTICLE
TECHNICAL FIELD
The non-limiting embodiments disclosed herein generally relate to a molding
apparatus, and
more particularly to an in-mold shutter and a molded article transfer device
for use with an
injection mold, and a controller with which to execute related molding
processes.
BACKGROUND
United States Patent 7,351,050 to Vanderploeg et al., published on April 1,
2008 teaches a
servo side shuttle apparatus and method for a molding machine includes
structure and/or steps
whereby a shuttle plate is disposed adjacent at least one of a first mold half
and a second mold
half of the molding machine. A guidance assembly is coupled to the mold half
and guides the
shuttle plate linearly across a molding face of the mold half. A drive
mechanism is provided
to drive the shuttle plate in a linear direction. An operation structure is
coupled to the shuttle
plate and is configured to perform an operation on a molded article disposed
either in the
mold cavity or on the mold core. The operation may include removing the molded
article
from a mold core, applying a label to a mold cavity, and/or closing the lid of
a molded article
while it is resident on the mold core.
United States Patent 5,037,597 to McGinley et al., published on August, 6,
1991 teaches an
injection molding apparatus and process for forming a plurality of first parts
and a plurality of
complementary second parts during a single molding cycle has a system for
removing parts
molded during each cycle and for assembling the parts into fmished articles.
The system
includes a plurality of rotatable suction cups for removing the parts and for
aligning them
with and inserting them into a series of loading ports in a central mold
member so as to mate
respective ones of the first parts with respective ones of the second parts.
The central mold
member further has internal chute assemblies for conveying assembled articles
away from the
mold. A novel system for driving the rotatable suction cups uses a rotatable
member mounted
to various mold halves and a camming arrangement whereby relative movement of
the mold
halves during the mold closing and opening motions causes rotation of the
suction cups.
United States Patent 4,589,840 to Schad, published on May 20, 1986 teaches an
apparatus for
continuously receiving and collecting molded articles from a continuously
cycling injection
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molding machine where the articles are collected sequentially and continuously
in a uniform
physical position or orientation.
United States Patent 6,939,504 to Homann et al., published on September 6,
2005 teaches a
method and system for producing hollow rib structures for trim components and
panels using
gas assisted injection molding. Movable insert members are provided in the
mold cavity,
particularly at the ends of the structural rib members. After the plastic
material is injected into
the mold cavity, the plastic is packed in the mold, and the insert members are
locked in
position. Selectively activatable locking mechanisms are used to lock up the
insert members.
Thereafter, gas or another fluid is introduced into the rib members in order
to provide hollow
channels therein. Movement of the insert members provides a recess or groove
for placement
of the displaced resin from the rib members. The displaced resin material
completes the
formation of the molded plastic article.
United States Patent 3,982,869 to Eggers, published on September 28, 1976
teaches a
multiple mold assembly is disclosed for molding articles in an injection
molding apparatus.
The assembly includes two molding sections that are alternatively shuttled
from positions
wherein one of the molding sections is in position for a molding operation,
and the other
molding section is in position for loading of inserts, performing preparatory
or finishing
operations, or removal of molded articles, to the reverse positions. The
shuttle assembly of
this invention is particularly adapted for use in a horizontal injection
molding apparatus and
for insert molding.
United States Patent 4,981,634 to Maus et al., published on January 1, 1991
teaches an
injection molding process creates a micro clean room environment inside a mold
cavity which
can stay closed to airborne contaminants while ejecting and transferring the
molded part out.
The molded part is formed and solidified at a parting line plane within the
mold cavity, then is
carried rearward on the movable mold insert to a second plane where it is
stripped off and
transferred out through a discharge aperture which is open when the mold
cavity is in the
second plane but closed off when in the first plane. The aperture faces
substantially
downward to prevent entry by upwelling thermal air currents. External supplied
filtered gas
can provide positive pressure through vents within the moldset's internal
space. This
maximizes mold and part cleanliness while speeding up "mold-open" cycle; may
eliminate
HEPA filters/enclosures and robots. Optical disks, lenses, food packaging and
medical parts
are suggested uses.
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United States Patent 4,950,152 to Brun, published on August 21, 1990 teaches a
plurality of
injection cores are inserted by a movable platen into corresponding injection
cavities defined
by mold inserts within a stationary platen, and the cores extend through
corresponding split
transfer mold cavities. After hollow preforms with threaded neck portions are
molded within
the cavities, the preforms are removed from the mold cavities, separated from
the injection
cores, and then shifted transversely by the split transfer molds to cooling or
blow cavities
defined by blow cavity inserts within the stationary platen on opposite sides
of the
corresponding injection cavities. The transfer molds return to receive the
injection cores, and
corresponding blow core units are inserted into the preforms within the blow
cavities for
pressurizing and expanding the preforms into firm contact with the blow
inserts. The preforms
are removed from the blow cavities by the blow cores on alternate cycles of
press operation
and are then released by retraction of the blow cores. The split transfer
molds are shifted
transversely in opposite directions and are opened and closed by a cam system
which includes
cam tracks mounted on the movable platen and incorporating cam track switches.
SUMMARY
According to a first aspect described herein, there is provided a molded
article transfer device
for use with an injection mold. The molded article transfer device includes a
shuttle that is
slidably arranged, in use, within the injection mold, the shuttle defining a
first aperture, at
least in part, that alternately accommodates: (i) a first mold stack arranged
therein; and (ii) a
first molded article received therein with opening of the first mold stack to
retract it from the
first aperture. The first molded article is transferable, in use, within the
first aperture with
shuttling movement of the shuttle.
According to a second aspect described herein, there is provided an injection
mold that
includes a first mold half, a second mold half, a molded article transfer
device, and an in-
mold shutter. The first mold half includes a first mold shoe with a first
stack portion of a first
mold stack connected thereto. The second mold half includes a second mold shoe
with a
second stack portion of the first mold stack connected thereto. The in-mold
shutter being
configured to position, in use, the first stack portion and the second stack
portion relative to
each other, along a mold-stroke axis, to close and open a molding cavity that
is defined
therebetween for molding and ejecting, respectively, a first molded article.
The molded article
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transfer device being configured to receive and transfer the first molded
article with opening
of the molding cavity.
According to a third aspect described herein, there is provided a controller
including
instructions being embodied in a controller-usable memory of the controller,
the instructions
for directing the controller to execute a molding process. The molding process
includes: (i)
closing a first mold stack of an injection mold to define a molding cavity
therein, wherein the
first mold stack is arranged within a first aperture that is defined by a
shuttle of a molded
article transfer device; (ii) molding a first molded article within the
molding cavity; (iii)
opening the first mold stack to retract it from the first aperture; (iv)
arranging the first mold
stack to eject the first molded article into the first aperture of the
shuttle; and (v) shuttling of
the shuttle to transfer the first molded article within the first aperture.
According to a fourth aspect described herein, there is provided an in-mold
shutter for
embedding in an injection mold. The in-mold shutter includes a shutter
actuator that is
configured to selectively engage a first mold shoe of an injection mold with a
platen of a mold
clamping assembly to hold the first mold shoe in an extended position, along a
mold-stroke
axis, during a step of molding a first molded article in the injection mold.
According to a fifth aspect described herein, there is provided an in-mold
shutter for
embedding in an injection mold. The in-mold shutter includes a shutter member
that is
associated, in use, with one of a platen of a mold clamping assembly and a
first mold shoe of
the injection mold. The in-mold shutter also includes a link member that is
associated with a
remaining one of the platen and the first mold shoe. The shutter member and
the link member
are configured to be selectively engageable, in use, to hold the first mold
shoe in an extended
position, along a mold-stroke axis, during a step of molding a first molded
article in the
injection mold.
According to a sixth aspect described herein, there is provided a controller
including
instructions being embodied in a controller-usable memory of the controller,
the instructions
for directing the controller to execute a molding process. The molding process
includes: (i)
closing a first mold stack of an injection mold to define a molding cavity
therein; (ii)
shuttering an in-mold shutter to engage a first mold shoe of the injection
mold with one of a
moving platen and a stationary platen of a injection molding system; (iii)
molding a first
molded article within the molding cavity; (iv) un-shuttering the in-mold
shutter to disengage
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the first mold shoe from the one of the moving platen and the stationary
platen; and (v)
selectively positioning the first mold shoe, along a mold-stroke axis.
These and other aspects and features will now become apparent to those skilled
in the art
upon review of the following description of specific non-limiting embodiments
in conjunction
with the accompanying drawings.
DETAILED DESCRIPTION OF THE DRAWINGS
The detailed description of illustrative (non-limiting) embodiments will be
more fully
appreciated when taken in conjunction with the accompanying drawings, in
which:
FIG. 1 depicts a schematic representation of an injection molding system
having a non-
limiting embodiment of an injection mold arranged therein;
FIG. 2A depicts a perspective view of a portion of a first mold half of the
injection mold of
FIG. 1 and of portions of non-limiting embodiments of a molded article
transfer device and of
an in-mold shutter that are associated therewith;
FIG. 2B depicts a perspective view of a portion of a second mold half of the
injection mold of
FIG. 1 and of a further portion of the molded article transfer device of FIG.
2A that is
associated therewith;
FIG. 3 depicts another perspective view of the portion of the molded article
transfer device of
FIG. 2A;
FIG. 4 depicts a further perspective view of the portion of the molded article
transfer device
of FIG. 2A in a partially assembled state;
FIGS. 5A ¨ 5D depict a start-up molding process involving the injection mold,
the molded
article transfer device, and the in-mold shutter of FIG. 2A, wherein the
injection mold, the
molded article transfer device, and the in-mold shutter are each shown in
section as taken
along line A-A identified in FIGS 2A and 2B;
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FIGS. 5E ¨ 5K depict a production molding process involving the injection
mold, the molded
article transfer device, and the in-mold shutter of FIG. 2A;
FIGS. 6A ¨ 6G depict an alternative production molding process involving an
alternative non-
limiting embodiment of the injection mold, and the molded article transfer
device and the in-
mold shutter of FIG. 2A;
FIGS. 7A ¨ 7F depict another alternative production molding process involving
the injection
mold and the in-mold part transfer device of FIG. 6A, and that does not
involve the in-mold
shutter of FIG. 2A;
FIGS. 8A ¨ 8G depict an alternative production molding process involving an
alternative non-
limiting embodiment of the injection mold, an alternative non-limiting
embodiment of the
molded article transfer device, and the in-mold shutter of FIG. 2A;
FIG. 9 depicts a flow chart of a first aspect of the production molding
process;
FIG. 10 depicts a flow chart of a second aspect of the production molding
process;
FIG. 11A and 11B, 12A and 12B, and 13A and 13B depict various alternative non-
limiting
embodiments of an in-mold shutter in a shut position and an open position,
respectively;
FIG. 14 depicts yet another alternative non-limiting embodiment of an in-mold
shutter in a
shut position.
The drawings are not necessarily to scale and may be illustrated by phantom
lines,
diagrammatic representations and fragmentary views. In certain instances,
details that are not
necessary for an understanding of the embodiments or that render other details
difficult to
perceive may have been omitted.
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DETAILED DESCRIPTION OF THE NON-LIMITING EMBODIMENT(S)
FIG. 1 depicts a schematic representation of an injection molding system 900
with a non-
limiting embodiment of an injection mold 100 arranged therein. The injection
mold 100 is
operable to mold a first molded article 102 (FIG. 2A) such as, for example, a
container
closure.
In the description of the injection molding system 900 and the injection mold
100 that follows
many of the components thereof are known to persons skilled in the art, and as
such these
known components will not be described in detail herein. A detailed
description of these
known components may be referenced, at least in part, in the following
reference books (for
example): (i) "Injection Molding Handbook" authored by OSSWALD/TURNG/GRAMANN
(ISBN: 3-446-21669-2), (ii) "Injection Molding Handbook" authored by ROSATO
AND
ROSATO (ISBN: 0-412-10581-3), (iii) "Injection Molding Systems" 3rd Edition
authored by
JOHANNABER (ISBN 3-446-17733-7) and/or (iv) "Runner and Gating Design
Handbook"
authored by BEAUMONT (ISBN 1-446-22672-9).
The injection molding system 900 shown in FIG. 1 is shown to include, but is
not limited to, a
mold clamping assembly 996 and an injection assembly 997.
By way of example, the mold clamping assembly 996 described hereafter is
representative of
a typical three-platen variety although no such specific limitation on the
generality of the
construction and/or operation thereof is intended. As such the mold clamping
assembly 996
may have a different construction, such as, for example, one having only two-
platens. That
being said, the non-limiting embodiment of the mold clamping assembly 996
includes,
amongst other things, a moving platen 912, a stationary platen 914, a clamp
block 913, and a
tie bar 916. The tie bar 916 links the stationary platen 914 with the clamp
block 913, and
moreover slidably supports the moving platen 912 thereon. While for the sake
of simplicity of
depiction only one tie bar 916 is shown, it is typical to provide four such
tie bars 916, one
extending between each of the four corners of the moving platen 912, the
stationary platen
914, and the clamp block 913. The mold clamping assembly 996 also includes a
platen-
moving actuator 915 (such as, for example, a hydraulic actuator, a pneumatic
actuator, an
electro-mechanical actuator, or the like) that is connected between the moving
platen 912 and
the clamp block 913. The platen-moving actuator 915 is operable, in use, to
move the moving
platen 912 with respect to the stationary platen 914 and thus move a first
mold half 96 with
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respect to a second mold half 98 that are mounted thereto, respectively. The
mold clamping
assembly 996 further includes a clamp actuator 918 and a clamp shutter 920 in
association
with the clamp block 913. The clamp shutter 920 is operable, in use, to
selectively connect the
clamp actuator 918 with the moving platen 912 for sake of a clamping together
of the first
mold half 96 and the second mold half 98. Lastly, the mold clamping assembly
996 may also
include an ejector actuator 922 (such as, for example, a hydraulic actuator, a
pneumatic
actuator, an electro-mechanical actuator, or the like) that is associated with
the moving platen
912. The ejector actuator 922 is connectable to a structure that is associated
with the first
mold half 96. The structure of the first mold half 96 is driven, in use, with
actuation of the
ejector actuator 922, whereby an operation is performed, such as, for example,
ejecting the
first molded article 102 from the first mold half 96.
By way of example, the injection assembly 997 described hereafter is
representative of a
typical reciprocating screw variety although no specific limitation on the
generality of a
construction and/or operation thereof is intended. As such the injection
assembly 997 may
have a different construction, such as, for example, one having separate
plasticizing and
injection means (i.e. so-called two stage variety). The injection assembly 997
is operable to
melt and inject a molding material, such as, for example, Polyethylene or
Polyethylene-
terephthalate (PET) through a machine nozzle (not shown) and into a melt
distribution
apparatus 190 (e.g. hot runner, cold runner, insulated runner, or the like)
that is associated
with the second mold half 98. The melt distribution apparatus 190 in turn
directs the molding
material into one or more molding cavity 101 (FIG. 5A) that are defined within
the injection
mold 100 with the first mold half 96 and the second mold half 98 being closed
and clamped
together.
The first mold half 96 of the injection mold 100 is further shown as including
an in-mold
shutter 140, a molded article transfer device 150, and a first mold shoe 130
arranged
therebetween. A detailed description of the structure and operation of the
foregoing will
follow. Broadly speaking, the in-mold shutter 140 is operable to selectively
engage, in use,
the first mold shoe 130 (FIG. 2A) of the first mold half 96 to one of the
moving platen 912
and the stationary platen 914 of the mold clamping assembly 996, whereby the
injection mold
100 may be opened or closed substantially without having to move the moving
platen 912
relative to the stationary platen 914 (although such movement is not
precluded). For its part,
the first mold shoe 130 is structured to have a first stack portion 110 (FIG.
5A) of a first mold
stack 106A connected thereto. Lastly, the molded article transfer device 150
is operable to
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transfer the first molded article 102A (FIG. 2A) that is received from the
first mold stack
106A.
A detailed construction of the non-limiting embodiment of the injection mold
100 may be
appreciated with further reference to FIGS. 2A, 2B, 3, and 5A. As previously
mentioned, and
as best shown in FIG. 5A, the first stack portion 110 of the first mold stack
106A is shown
connected to the first mold shoe 130 of the first mold half 96. Also shown is
a second stack
portion 120 of the first mold stack 106A that is connected to a second mold
shoe 131 of the
second mold half 98. The first stack portion 110 and the second stack portion
120 are
positioned, in use, relative to each other, along a mold-stroke axis X of the
injection mold
100, to close and open a molding cavity 101 that is defined therebetween for
molding and
ejecting, respectively, the first molded article 102A (FIG. 2A) therein.
The first stack portion 110 of the first mold stack 106A includes an inner
core 112, an outer
core 114, and a stripper sleeve 116 that cooperate, in use, with a cavity
insert 122 of the
second stack portion 120 to define the molding cavity 101.
The outer core 114 is slidably arranged around the inner core 112 to
accommodate, in use,
relative movement thereof along the mold-stroke axis X, a technical effect of
which may
include, for example, the release of a seal portion 103 (FIG. 5D) of the first
molded article
102A. Likewise, the stripper sleeve 116 is slidably arranged around the outer
core 114 to
accommodate, in use, the relative movement thereof along the mold-stroke axis
X, a technical
effect of which may include, for example, the stripping of the first molded
article 102A from
the outer core 114.
As previously mentioned, the foregoing members of the first stack portion 110
are connected
to the first mold shoe 130. Now, in more detail, the first mold shoe 130
includes a first core
retainer 132 and a stripper retainer 136 that are slidably connected together
to accommodate
the relative movement thereof, in use, along the mold-stroke axis X, wherein
the inner core
112 is connected to the first core retainer 132, and the stripper sleeve 116
is retained with the
stripper retainer 136. As such, the stripper sleeve 116 is movable, in use,
along the mold-
stroke axis X, relative to the inner core 112, and to the outer core 114,
albeit once the outer
core 114 has reached its limit of travel with respect to the inner core 112,
between a stripper
sleeve molding position (FIG. 5A) and an ejection position (FIG. 5D), with
relative
movement between the first core retainer 132 and the stripper retainer 136.
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Of note, the inner core 112 is shown to be connected to the first core
retainer 132 in a fluid
tight manner to isolate a coolant circuit that is defined therein. The coolant
channel is defined
between a coolant dispenser 193 and a space that is defined within the inner
core 112 within
which the coolant dispenser 193 is arranged. An end portion of the coolant
dispenser 193 is
connected to the first core retainer 132 and is otherwise arranged to direct
coolant, in use,
between a coolant inlet conduit 191 and a coolant outlet conduit 194 that are
defined in the
first core retainer 132. In operation, a coolant, such as water, is circulated
through the coolant
channel to remove heat from the inner core 112, and any of the other members
of the first
mold stack 106A that are thermally connected therewith, whereby the first
molded article
102A may be rapidly cooled to ensure a faster molding cycle.
In this arrangement, the stripper sleeve 116 is fixedly arranged in a
passageway 137 that is
defined in the stripper retainer 136. More particularly, the stripper retainer
136 includes a
base plate 133, an intermediate plate 134, and a top plate 135 that are
fastened together, in
use, with the passageway 137 being defined therethrough, wherein a flange
portion 123 of the
stripper sleeve 116 is retained between the intermediate plate 134 and the top
plate 135. The
outer core 114 is slidably arranged within the passageway 137 to accommodate
relative
movement between the outer core 114 and the stripper sleeve 116, along the
mold-stroke axis
X, with the movement of the outer core 114, from an outer core molding
position (FIG. 5A) to
a stripping position (FIG. 5D).
As previously alluded to, the outer core 114 and the inner core 112 are
slidably retained
together to limit, in use, the relative movement thereof, in use, along the
mold-stroke axis X.
For example, the inner core 112 may be structured to define a bayonet 113 and
the outer core
114, 214, 314 structured to define a bayonet pocket 117, wherein the bayonet
113 and the
bayonet pocket 117 are configured to cooperate, when rotatably engaged, to
slidably retain
the outer core 114 about the inner core 112. In operation the inner core 112
and the outer core
114 are kept rotatably engaged by a key 119 that is associated with the
stripper retainer 136.
The key 119 is fixedly arranged between the base plate 133 and the
intermediate plate 134
with a portion thereof extending into the passageway 137 with which to
cooperate with the
outer core 114 to maintain an angular orientation thereof with respect to the
inner core 112.
The first stack portion 110 further includes a resilient member 115 that is
arranged between
the inner core 112 and the outer core 114, and wherein the resilient member
115 is arranged
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to bias the outer core 114 towards a forward limit of travel with respect to
the stripper sleeve
116 that corresponds with their relative arrangement during the molding of the
first molded
article 102A ¨ as shown in FIG. 5A. The forward limit of travel of the outer
core 114 with
respect to the stripper sleeve 116 is provided through cooperation of a
shoulder 121 that is
defined on the outer core 114 and a step 139 that is defined in the passageway
137 across a
bottom of the flange portion 123 of the stripper sleeve 116.
As previously mentioned, the injection mold 100 further includes the in-mold
shutter 140 that
is associated with the first mold half 96. As best shown with reference to
FIG. 5A, the in-
mold shutter 140 broadly includes a shutter member 144 and a link member 146.
As shown,
the shutter member 144 is associated with the moving platen 912 of the mold
clamping
assembly 996, and the link member 146 is associated with the first mold shoe
130. In
operation, the shutter member 144 is alternately selectively positioned, in
use, in: i) an open
position U, and ii) a shut position S. As such, the in-mold shutter 140
further includes a
shutter actuator 148 that is connected to the shutter member 144, the shutter
actuator 148
being operable, in use, to drive the movement of the shutter member 144
between the open
position U and the shut position S. With the shutter member 144 arranged in
the shut position
S, as shown in FIG. 5A, the shutter member 144 is engaged with the link member
146,
whereby the first mold shoe 130 is engaged with the moving platen 912. With
the shutter
member 144 arranged in the open position U, as shown in FIG. 5B or 5F, the
shutter member
144 is disengaged from the link member 146, whereby the first mold shoe 130
may be moved,
in use, along the mold-stroke axis X. The movement of the first mold shoe 130,
along the
mold-stroke axis X, may be driven, for example, by the ejector actuator 922 of
the mold
clamping assembly 996. The foregoing is schematically shown with reference to
FIG. 5B,
wherein the ejector actuator 922 is shown to be connected to the first core
retainer 132.
The in-mold shutter 140 further includes a support base 142 upon which the
shutter member
144 is slidably coupled, and wherein the support base 142 is structured to be
fixedly
connected, in use, by a fastener 192, or the like, to the moving platen 912.
Furthermore, the
link member 146 is connected to a back face of the first core retainer 132 of
the first mold
shoe 130. In this arrangement, the link member 146 is aligned with the first
stack portion 110
of the first mold stack 106A. Likewise, where the injection mold 100 includes
a plurality of
mold stacks, included in which is the first mold stack 106A, with which to
define a plurality
molding cavities to mold, in use, a plurality of molded articles, such as that
shown with
reference to FIGS. 2A and 2B, the in-mold shutter 140 may further include a
plurality of link
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members, included in which is the link member 146, wherein each of the
plurality of link
members is aligned with one of the plurality of mold stacks. That being said,
no such specific
limitation as to the number and arrangement of the link members is intended.
The shutter member 144 further defines a first clearance aperture 145 that is
configured to
accommodate the link member 146 being arranged therein, in use, with the
shutter member
144 being positioned in the open position U (FIG. 5B or 5F) and with the
movement of the
first mold shoe 130, along the mold-stroke axis X, towards a retracted
position B (FIG. 5D or
51). Depending on the required stroke of the first mold shoe 130, the first
clearance aperture
145 may be structured to extend, as shown, through the shutter member 144.
Furthermore, the
support base 142 may also define a second clearance aperture 143 that is
aligned, in use, with
the first clearance aperture 145, with positioning of the shutter member 144
into the open
position U. As such, the second clearance aperture 143 is configured to
accommodate the link
member 146 being arranged therein, in use, with the shutter member 144 being
positioned in
the open position U and with the movement of the first mold shoe 130, along
the mold-stroke
axis X, towards the retracted position B, as shown in FIGS. 5D or 51.
The shape and size of the link member 146 in relation to those of the first
clearance aperture
145 and the second clearance aperture 143 is not particularly limited so long
as the link
member 146 is arrangeable therethrough. In the present non-limiting example,
the link
member 146 has a cylindrical body, and wherein the first clearance aperture
145 and the
second clearance aperture 143 are provided as complementary cylindrical bores.
As mentioned previously, the first core retainer 132 and the stripper retainer
136 are slidably
connected together to accommodate the relative movement thereof, in use, along
the mold-
stroke axis X. Furthermore, the first core retainer 132 and the stripper
retainer 136 are also
slidably connected to the in-mold shutter 140. As such, and as shown with
reference to FIG.
5A, the in-mold shutter 140 further includes a guide member 141 with which to
guide the
members of the first mold shoe 130 along the mold-stroke axis X. More
particularly, the
guide member 141 may include one or more leader pins, or the like, that are
fixed to the
support base 142, wherein the guide member 141 is slidably received within a
bushing 149
that is arranged in each of the first core retainer 132 and the stripper
retainer 136.
Various other alternative non-limiting embodiments of the injection mold 100
including the
in-mold shutter 140 are contemplated, although not shown. For example, the in-
mold shutter
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140 may be associated with the second mold half 98 instead of the first mold
half 96, and as
such cooperates, in use, with the stationary platen 914 (FIG. 1). As a further
example, the
association of the shutter member 144 and the link member 146 may be
interchanged,
wherein the shutter member 144 is associated with the first mold shoe 130, and
the link
member 146 is associated with the moving platen 912. More generally, within
the various
other alternative non-limiting embodiments of the injection mold 100 one of
the shutter
member 144 and the link member 146 is associated, in use, with one of the
moving platen 912
and the stationary platen 914 of the injection molding system 900, and wherein
a remaining
one of the shutter member 144 and the link member 146 is associated, in use,
with the first
mold shoe 130.
As previously mentioned, the injection mold 100 also includes the molded
article transfer
device 150. As shown with reference to FIGS. 2A, 2B, 3, 4, and 5A, the molded
article
transfer device 150 broadly includes a shuttle 154 that is slidably arranged,
in use, within the
injection mold 100. The shuttle 154 defining a first aperture 156A, at least
in part, that
alternately accommodates: i) the first mold stack 106A arranged therein, as
shown in FIG.
5A; and ii) the first molded article 102A received therein, as shown in FIG.
51, wherein the
first molded article 102A being transferable, in use, within the first
aperture 156A with
shuttling movement of the shuttle 154.
More particularly, the shuttle 154 is slidably arranged between the first mold
shoe 130 and the
second mold shoe 131 of the injection mold 100 to accommodate the shuttling
movement
therebetween, in use, along a shuttling axis Y (FIG. 3) that is generally
perpendicular to the
mold-stroke axis X (FIG. 5A). As shown with reference to FIG. 5A, the first
aperture 156A is
configured to accommodate, when positioned in a first receiving position R,
the first stack
portion 110 of the first mold stack 106A being retractably arranged therein
during molding, in
use, of the first molded article 102A (FIG. 5B). As shown with reference to
FIG. 51, the first
aperture 156A is further configured to receive, while still positioned in the
first receiving
position R, the first molded article 102A therein with retraction of the first
stack portion 110
therefrom and with ejection thereof from the first stack portion 110.
Thereafter, the first
molded article 102A is transferred, in use, within the first aperture 156A,
with the shuttling
movement of the shuttle 154 from the first receiving position R to a first
transfer position T
(FIG. 3). To provide for the shuttling movements of the shuttle 154 the molded
article transfer
device 150 is further provided with a shuttle actuator 168 that is connected
to the shuttle 154,
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the shuttle actuator 168 being operable, in use, to drive the shuttling
movement of the shuttle
154.
In this arrangement the shuttle 154 is slidably arranged to accommodate the
shuttling
movement thereof with the first mold half 96 and the second mold half 98 of
the injection
mold 100 being positioned in a mold closed configuration C (FIG. 5A). That is,
the first mold
half 96 and the second mold half 98 of the injection mold 100 need not be
rearranged into a
mold open configuration 0 (FIG. 5B) in order to accommodate the shuttling
movement of the
shuttle 154. As such, the molded article transfer device 150 further includes
a base plate 170
upon which the shuttle 154 is slidably connected for the shuttling movement
thereof, in use,
along the shuttling axis Y. The base plate 170 is associated, as shown in FIG.
5A, with the
first mold half 96 of the injection mold 100. The manner in which the shuttle
154 is slidably
connected to the base plate 170 is not particularly limited. For example, in
the present non-
limiting embodiment the shuttle 154 is slidably connected to a face of the
base plate 170
using a linear bearing arrangement. More particularly, for ease of
manufacture, service, and
assembly, the shuttle 154 may be provided as a plurality of interconnected
shuttle modules
155, as shown with reference to FIG. 2A, each of which is connected to a
bearing block 172,
as shown with reference to FIG. 4, that is in turn slidably connected to a
linear race 174 that is
mounted to the base plate 170.
As previously mentioned, the base plate 170 is associated, as shown in FIG.
5A, with the first
mold half 96 of the injection mold 100. As such, the in-mold shutter 140 is
further provided
with an ejector box 147 with which to frame the first mold shoe 130 and
otherwise couple, in
use, the base plate 170 of the molded article transfer device 150 with the
moving platen 912
of the injection molding system 900. More particularly, a fastener 192
connects the base plate
170 to a top of the ejector box 147 and another fastener 192 connects the
support base 142 of
the in-mold shutter 140 to a bottom of the ejector box 147, recalling that the
support base 142
is fixedly connected, in use, by a fastener 192, or the like, to the moving
platen 912.
Furthermore, the ejector box 147 defines a space 151 within which the first
mold shoe 130
may be moved, in use, along the mold-stroke axis X, to provide for positioning
of the
members of the mold stacks. As previously mentioned, the movement of the first
mold shoe
130, along the mold-stroke axis X, may be driven, at least in part, by the
ejector actuator 922
of the mold clamping assembly 996. More particularly, the ejector actuator 922
is shown to be
connected to the first core retainer 132 for a repositioning thereof.
Furthermore, and as shown
in FIG. 5B, the injection mold 100 further includes a stripper actuator 153
with which to
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connect the molded article transfer device 150 with the stripper retainer 136,
the stripper
actuator 153 being operable, in use, to drive the relative movement of the
stripper retainer 136
along the mold-stroke axis X.
As shown with reference to FIG. 2B and 5A, the molded article transfer device
150 further
includes a first barricade 158A that is associated the second mold half 98.
The first barricade
158A is configured to cooperate with the shuttle 154, as shown in FIG. 5A, to
further define
the first aperture 156A when positioned in the first receiving position R.
Returning to the description of the non-limiting embodiment, and with
reference to FIG. 2A,
it is shown that the shuttle 154 further defines a first channel 160A. The
first channel 160A
and the first barricade 158A are configured to cooperate, in use, to define
the first aperture
156A with the first barricade 158A being positioned, by the shuttling movement
of the shuttle
154, within the first channel 160A. The foregoing arrangement is not clearly
shown in the
figures but may otherwise be appreciated with reference to FIG. 3 wherein a
second channel
160B and the first barricade 158A are configured to cooperate to define a
second aperture
156B with the first barricade 158A being positioned within the second channel
160B. With
positioning, in use, of the first channel 160A into the first receiving
position R, as shown in
FIG. 2A, by the shuttling movement of the shuttle 154, the first channel 160A
is positioned to
accommodate the first stack portion 110, 210, 310 being retractably arranged
therein during
molding of the first molded article 102A.
With reference to FIG. 3, it may be appreciated that the first channel 160A is
further
configured to accommodate the first molded article 102A passing therealong,
towards an exit
164 thereof, with positioning, in use, of the first channel 160A into the
first transfer position
T, by the shuttling movement of the shuttle 154, wherein the first channel
160A is positioned
beside the first stack portion 110, 210, 310 and the first barricade 158A.
As previously mentioned, the shuttle 154 further defines a second channel
160B. The second
channel 160B is adjacent to, and generally parallel with, the first channel
160A, wherein with
one of the first channel 160A and the second channel 160B being positioned in
the first
receiving position R a remaining one of the first channel 160A and the second
channel 160B
is positioned in the first transfer position T. The foregoing arrangement may
be appreciated
by contrasting FIGS. 2A and 3, wherein the shuttle 154 has undergone a
shuttling movement,
and that in FIG. 2A the first channel 160A is registered in the first
receiving position R and
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the second channel 160B is in the first transfer position T, whereas in FIG. 3
the situation is
reversed in that the first channel 160A is in the first transfer position T
and the second
channel 160B is in the first receiving position R.
As shown in FIG. 3, the second channel 160B and the first barricade 158A are
configured to
cooperate, in use, to define the second aperture 156B with the first barricade
158A being
positioned within the second channel 160B, with positioning, in use, of the
second channel
160B into the first receiving position R, by the shuttling movement of the
shuttle 154,
wherein the second channel 160B is positioned to accommodate the first stack
portion 110
being retractably arranged therein during molding of another of the first
molded article 102A.
Likewise, the second channel 160B is further configured to accommodate the
another of the
first molded article 102A passing therealong, not shown, towards the exit
thereof, with
positioning, in use, of the second channel 160B into the first transfer
position T, as shown in
FIG. 2A, by the shuttling movement of the shuttle 154, wherein the second
channel 160B is
positioned beside the first stack portion 110 and the first barricade 158A.
As may be appreciated with reference to FIGS. 2A and 3, the first channel 160A
and the
second channel 160B each include a straight portion within which the first
aperture 156A and
the second aperture 156B are defined, respectively. As such, the first channel
160A and the
second channel 160B are defined between cooperating pairs of guide bars 162
that are
associated with the shuttle 154. The pairs of guide bars 162 define gaps 166
therein through
which the first barricade 158A is slid, in use, with relative movement of the
shuttle 154 with
respect to the first barricade 158A.
As may be appreciated with reference to FIG. 2A, the injection mold 100
includes several
columns of mold stacks with which to simultaneously mold a plurality of molded
articles. Of
note, while the portion of the second mold half 98 shown in FIG. 2A depicts
only the second
stack portion 120 of the first mold stack 106A, the second mold half 98 would,
in its entirety,
further include other second stack portions, not shown, with which to
cooperate with the other
mold stacks.
As shown with reference to FIGS. 2A and 3, the columns of mold stacks includes
a first
column of mold stacks, within which is the first mold stack 106A with which to
mold the first
molded article 102A and a second mold stack 106B with which to mold a second
molded
article 102B. The molded article transfer device 150 further comprises a
second barricade
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158B that is associated with the second mold half 98. The first channel 160A
and the second
barricade 158B are configured to cooperate, in use, to define a third aperture
156C with the
second barricade 158B being positioned within the first channel 160A, with
positioning, in
use, of the first channel 160A into the first receiving position R, by the
shuttling movement of
the shuttle 154, wherein the first channel 160A is positioned to accommodate
the first stack
0 portion 110 of the second mold stack 106B being retractably arranged
therein during molding
of the second molded article 102B. As shown with reference to FIG. 3, the
first channel 160A
is further configured to accommodate the second molded article 102B passing
therealong,
towards the exit 164 thereof, with positioning, in use, of the first channel
160A into the first
transfer position T, by the shuttling movement of the shuttle 154, wherein the
first channel
160A is positioned beside the first column of mold stacks, the first barricade
158A and the
second barricade 158B. Likewise, as shown again with reference to FIG. 3, the
second
channel 160B and the second barricade 158B are configured to cooperate, in
use, to define a
fourth aperture 156D with the second barricade 158B being positioned within
the second
channel 160B, with positioning, in use, of the second channel 160B into the
first receiving
position R, by the shuttling movement of the shuttle 154, wherein the second
channel 160B is
positioned to accommodate the first stack portion 110 of the second mold stack
106B being
retractably arranged therein during molding of another of the second molded
article 102B (not
shown). As shown with reference to FIG. 3, the second channel 160B is further
configured to
accommodate the another of the second molded article 102B (not shown) passing
therealong,
not shown, towards the exit 164 thereof, with positioning, in use, of the
second channel 160B
into the first transfer position T, by the shuttling movement of the shuttle
154, wherein the
second channel 160B is positioned beside the first stack portion 110, 210, 310
of the first
column of mold stacks, the first barricade 158A and the second barricade 158B.
Also shown with reference to FIGS. 2A and 3 is that the columns of mold stacks
also includes
a second column of mold stacks having a third mold stack 106C with which to
mold a third
molded article 102C and a fourth mold stack 106D with which to mold a fourth
molded article
102D. As such, the molded article transfer device 150 further includes a third
barricade 158C
and a fourth barricade 158D that are associated with the second mold half 98.
Furthermore,
the shuttle 154 further defines a third channel 160C and a fourth channel 160D
that are
adjacent to, and generally parallel with, the first channel 160A and the
second channel 160B,
wherein with one of the third channel 160C and the fourth channel 160D being
positioned in a
second receiving position R' a remaining one of the third channel 160C and the
fourth
channel 160D is positioned in a second transfer position T'. As shown in FIG.
2A, the third
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channel 160C and the third barricade 158C are configured to cooperate, in use,
to define a
fifth aperture 156E with the third barricade 158C being positioned within the
third channel
160C, with positioning, in use, of the third channel 160C into the second
receiving position
R', by the shuttling movement of the shuttle 154, wherein the third channel
160C is
positioned to accommodate the first stack portion 110 of the third mold stack
106C being
retractably arranged therein during molding of the third molded article 102C.
Likewise, and
as shown in FIG. 3, the fourth channel 160D and the third barricade 158C are
configured to
cooperate, in use, to define a sixth aperture 156F with the third barricade
158C being
positioned within the fourth channel 160D, with positioning, in use, of the
fourth channel
160D into the second receiving position R', by the shuttling movement of the
shuttle 154,
wherein the fourth channel 160D is positioned to accommodate the first stack
portion 110,
210, 310 of the third mold stack 106C being retractably arranged therein
during molding of
another of the third molded article 102C (not shown).
Likewise, and as shown in FIG. 2A, the third channel 160C and the fourth
barricade 158D are
configured to cooperate, in use, to define a seventh aperture 156G with the
fourth barricade
158D being positioned within the third channel 160C, with positioning, in use,
of the third
channel 160C into the second receiving position R', by the shuttling movement
of the shuttle
154, wherein the third channel 160C is positioned to accommodate the first
stack portion 110,
210, 310 of the fourth mold stack 106D being retractably arranged therein
during molding of
the fourth molded article 102D. Lastly, and as shown in FIG. 3, the fourth
channel 160D and
the fourth barricade 158D are configured to cooperate, in use, to define an
eighth aperture
156H with the fourth barricade 158D being positioned within the fourth channel
160D, with
positioning, in use, of the fourth channel 160D into the second receiving
position R', by the
shuttling movement of the shuttle 154, wherein the fourth channel 160D is
positioned to
accommodate the first stack portion 110, 210, 310 of the fourth mold stack
106D being
retractably arranged therein during molding of another of the fourth molded
article 102D (not
shown). Furthermore, the third channel 160C and the fourth channel 160D are
further
configured to accommodate the third molded article 102C and the fourth molded
article 102D,
and alternately the another of the third molded article 102C and the another
of the fourth
molded article 102D, respectively, passing therealong, towards the exit 164
thereof, with
sequential arranging, in use, of the third channel 160C and the fourth channel
160D into the
second transfer position T', by the shuttling movement of the shuttle 154,
wherein the third
channel 160C and the fourth channel 160D are positioned beside the second
column of mold
stacks, the third barricade 158C and the fourth barricade 158D.
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Thus, having just described the non-limiting embodiment of the injection mold
100, and prior
to discussing the detailed operation of the foregoing, it is worth noting that
a simple
reconfiguration of the foregoing is possible, albeit not shown, wherein the
base plate 170 is
associated with the second mold half 98 of the injection mold 100, and as such
the first
barricade 158A, and the like, would instead be associated the first mold half
96.
The operation of the foregoing non-limiting embodiment of the injection mold
100 will now
be described with reference to a start-up molding process, as shown in FIGS.
5A through 5D,
and thereafter a production molding process, as shown in FIGS. 5E through 5J.
Where
reference is made to the operation of the first mold stack 106A the same
operation applies to
the remaining mold stacks in the injection mold 100 even though not
specifically mentioned.
As the name implies, the start-up molding process would typically be executed,
although not
exclusively, when starting the injection mold 100. As generally known, the
start-up of an
injection mold often requires manual intervention by a molding system operator
to clear
short-shots (i.e. molded articles that are only partially molded), to remove
molded articles that
stubbornly resist ejection (e.g. typically due to an over cooling thereof), or
to remove flash
(i.e. molding material that has seeped outside of the molding cavity 101), and
the like. Thus,
during start-up it may be necessary to position the first mold half 96 and the
second mold half
98, along the mold-stroke axis X, into the mold open configuration 0, as shown
in FIG. 5B,
with relative repositioning of the moving platen 912 and the stationary platen
914, to provide
ready access to each of the first stack portion 110 and the second stack
portion 120.
The start-up molding process begins, as shown in FIG. 5A, with the injection
mold 100 being
positioned in the mold closed configuration C with the first mold shoe 130
being positioned,
along the mold-stroke axis X, in an extended position E such that the first
mold stack 106A is
closed to define the molding cavity 101 therein. Furthermore, the shutter
member 144 of the
in-mold shutter 140 is in the shut position S, whereby the first mold shoe 130
is engaged with
the moving platen 912. Accordingly, the injection mold 100 is configured for
molding of the
first molded article 102A. Thereafter, molding of the first molded article
102A (not shown) is
performed with injection of molding material into the molding cavity 101.
The start-up molding process next includes, as shown with reference to FIG.
5B, opening of
the first mold stack 106A with positioning of the first mold half 96 and the
second mold half
98, along the mold-stroke axis X, into the mold open configuration 0, with
positioning of the
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moving platen 912 (FIG. 1) away from the stationary platen 914 (FIG. 1)
through control of
the platen-moving actuator 915 (FIG. 1). In so doing, the first molded article
102A is
withdrawn with the first stack portion 110. With the opening of the injection
mold 100 there
is also an un-shuttering of the in-mold shutter 140 to disengage the first
mold shoe 130 from
the moving platen 912. The un-shuttering of the shutter member 144 includes
shifting the
shutter member 144 into the open position U, through control of the shutter
actuator 148,
wherein the shutter member 144 is disengaged from the link member 146.
The start-up molding process next includes, as shown with reference to FIG.
5C, stripping of
a seal portion 103 of the first molded article 102A from where it was molded
in between the
inner core 112 and the outer core 114 with relative movement thereof. The
foregoing involves
holding the position of the stripper retainer 136 against the base plate 170,
through control of
the stripper actuator 153, to keep the stripper sleeve 116 that is fixed
thereto in the stripper
sleeve molding position, while at the same time retracting the first core
retainer 132, along the
mold-stroke axis X, through control of the ejector actuator 922, and thereby
retract the inner
core 112 that is retained thereto, a distance that is sufficient to strip the
seal portion 103.
The start-up molding process next includes, as shown with reference to FIG.
5D, ejecting of
the first molded article 102A from the first stack portion 110 with relative
movement between
the outer core 114 and the stripper sleeve 116, wherein the stripper sleeve
116 pushes the first
molded article 102A off of the outer core 114. The foregoing involves holding
the position of
the stripper retainer 136 against the base plate 170, through control of the
stripper actuator
153, to keep the stripper sleeve 116 that is fixed thereto in the stripper
sleeve molding
position, while at the same retracting the first core retainer 132, along the
mold stroke axis X,
into a retracted position B, through control of the ejector actuator 922, to
retract the inner core
112 that is retained thereon a distance that is sufficient to further move the
outer core 114 into
stripping position by virtue of the inner core 112 having reached its rearward
limit of travel
relative to the outer core 114 as defined by the bayonet 113 in cooperation
with the bayonet
pocket 117.
The start-up molding process ends, as shown with reference to FIG. 5E, with
closing of the
first mold stack 106A with positioning of the first mold half 96 and the
second mold half 98,
along the mold-stroke axis X, into the mold closed configuration C, with
positioning of the
moving platen 912 towards the stationary platen 914 through control of the
platen-moving
actuator 915 (FIG. 1). The closing of the first mold stack 106A further
includes extending the
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first core retainer 132, along the mold stroke axis X, into an extended
position E, through
control of the ejector actuator 922, to extend the inner core 112 that is
retained thereon into an
inner core molding position and in so doing push the outer core 114 into the
outer core
molding position by virtue of the inner core 112 having reached its forward
limit of travel
relative to the outer core 114, as defined by the bayonet 113 in cooperation
with the bayonet
pocket 117. With the closing of the injection mold 100 there is also a
shuttering of the in-
mold shutter 140 to engage the first mold shoe 130 to the moving platen 912
(FIG. 1). The
shuttering of the shutter member 144 includes shifting the shutter member 144
into the shut
position S, through control of the shutter actuator 148, wherein the shutter
member 144 is
once again engaged with the link member 146. The start-up molding process may
be repeated
many times, dependent on the operational status of the injection mold 100
(e.g. each of the
plurality of molding stacks molding molded articles of acceptable quality),
prior to execution
of the production molding process.
The production molding process for the injection mold 100 will be discussed
next. As the
name implies, the production molding process would typically be executed,
although not
exclusively, after completion of the start-up molding process. The production
molding
process is different from the start-up molding process in that it further
involves, amongst
other things, operating steps relating to the use of the molded article
transfer device 150, and
furthermore does not include the steps of opening and closing of the injection
mold 100. That
is, the production molding process does not require re-arranging of the first
mold half 96 and
the second mold half 98 between the mold open configuration 0 and the mold
closed
configuration C, and thus the relative movement of the moving platen 912 (FIG.
1) and the
stationary platen 914 (FIG. 1). A technical effect of the foregoing may
include, amongst
others, a shortening of the molding cycle time, wherein a component of time
that was
formerly contributed by the certain operations of the mold clamping assembly
996 have been
removed. That is, the production cycle no longer involves waiting for the
clamp shutter 920 to
be successively (i.e. with each molding cycle) un-shuttered and re-shuttered,
and nor does it
require waiting for the movements, to and fro, of the moving platen 912 (FIG.
1). That being
said, the rearranging of the first mold half 96 and the second mold half 98 is
not precluded.
The production molding process begins, as shown in FIG. 5E, with the injection
mold 100
being positioned in the mold closed configuration C with the first mold shoe
130 being
positioned, along the mold-stroke axis X, in an extended position E such that
the first mold
stack 106A is closed to define the molding cavity 101 therein. In so doing,
the first mold stack
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106A is arranged within the first aperture 156A that is defined by the shuttle
154 of the
molded article transfer device 150, the first aperture 154A being positioned
in the first
receiving position R. Furthermore, the shutter member 144 of the in-mold
shutter 140 is in the
shut position S, whereby the first mold shoe 130 is engaged with the moving
platen 912 (FIG.
1). Accordingly, the injection mold 100 is configured for molding of the first
molded article
102A. Thereafter, molding of the first molded article 102A (not shown) is
performed with
injection of molding material into the molding cavity 101.
The production molding process next includes, as shown with reference to FIG.
5F, the un-
shuttering of the in-mold shutter 140 to disengaged the first mold shoe 130
from the moving
platen 912 (FIG. 1). The un-shuttering of the shutter member 144 includes
shifting the shutter
member 144 into the open position U, through control of the shutter actuator
148, wherein the
shutter member 144 is disengaged from the link member 146.
The production molding process next includes, as shown with reference to FIG.
5G, opening
of the first mold stack 106A with retracting the first stack portion 110,
along the mold-stroke
axis X, to position the first molded article 102A that is arranged thereon in
the first aperture
156A. This involves retracting the stripper retainer 136 and the first core
retainer 132, in
tandem, along the mold-stroke axis X, and thus the retracting of the stripper
sleeve 116 and
the inner core 112 that are retained thereto, respectively, wherein the outer
core 114 retracts
with the inner core 112 and the stripper sleeve 116 by virtue being linked
together therewith
by the first molded article 102A. The retracting of the stripper retainer 136
and the first core
retainer 132 is provided through control of the stripper actuator 153 and the
ejector actuator
922, respectively.
The production molding process next includes, as shown with reference to FIG.
5H, a first
stage of arranging the first stack portion 110 to eject the first molded
article 102A into the
first aperture 156A of the shuttle 154, and more particularly the stripping of
the seal portion
103 of the first molded article 102A from where it was molded in between the
inner core 112
and the outer core 114 with relative movement thereof. The foregoing involves
holding the
position of the stripper retainer 136, through control of the stripper
actuator 153 (which in this
case is made quite simple given that the stripper actuator 153 has reached its
rearward limit of
travel), to keep the stripper sleeve 116 that is fixed thereto immobile,
whereby the first
molded article 102A is held in the first aperture 156A. The foregoing further
involves
retracting the first core retainer 132, through control of the ejector
actuator 922, to retract the
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inner core 112 that is retained thereon, along the mold stroke axis X, a
distance, relative to the
outer core 114 which is kept immobile by virtue of being arranged within the
first molded
article 102A, that is sufficient to strip the seal portion 103.
The production molding process next includes, as shown with reference to FIG.
51, a final
stage of arranging the first stack portion 110 to eject the first molded
article 102A into the
first aperture 156A of the shuttle 154, and furthermore retracting of the
first stack portion 110
from the first aperture 156A. The foregoing involves continuing to hold the
position of the
stripper retainer 136, through control of the stripper actuator 153, to keep
the stripper sleeve
116 that is fixed thereto immobile, whereby the first molded article 102A is
held in the first
aperture 156A. The foregoing further involves retracting the first core
retainer 132, along the
mold stroke axis X, into the retracted position B, through control of the
ejector actuator 922,
to retract the inner core 112 that is retained thereon a distance that is
sufficient to further
move the outer core 114 into stripping position by virtue of the inner core
112 having reached
its rearward limit of travel relative to the outer core 114 as defined by the
bayonet 113 in
cooperation with the bayonet pocket 117. The first molded article 102A is
stripped from the
outer core 114 as it is held in the first aperture 156A, through supporting
contact with a top of
the stripper sleeve 116, and the outer core 114 is retracted therefrom with
its retraction to the
stripping position.
The production molding process next includes, as shown with reference to FIG.
5J, shuttling
of the shuttle 154 to transfer the first molded article 102A within the first
aperture 156A. The
foregoing involves shuttling movement of the shuttle 154 between the first
mold half 96 and
the second mold half 98 of the injection mold 100, along the shuttling axis Y
(FIG. 3),
through control of the shuttle actuator 168, wherein the first channel 160A
(i.e. the movable
part of the first aperture 156A), and with it the first molded article 102A,
is moved from the
first receiving position R (FIG. 5E) to the first transfer position T.
The production molding process ends, as shown with reference to FIG. 5K, with
the passing
of the first molded article 102A along the first channel 160A towards the exit
164 (FIG. 3)
thereof (shown only by virtue of the disappearance of the first molded article
102A from the
first channel 160A), and closing of the first mold stack 106A. The closing of
the first mold
stack 106A involves rearranging the first mold shoe 130 into the extended
position E with
extension of the first core retainer 132, along the mold stroke axis X,
through control of the
ejector actuator 922, to extend the inner core 112 that is retained thereon
into the inner core
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molding position and in so doing push the outer core 114 into the outer core
molding position
by virtue of the inner core 112 having reached its forward limit of travel
relative to the outer
core 114, as defined by the bayonet 113 in cooperation with the bayonet pocket
117. In so
doing, the first stack portion 110 is arranged within the second aperture 156B
that is defined
by the shuttle 154 of the molded article transfer device 150, the second
aperture 154B being
positioned in the first receiving position R. While not shown, prior to
molding of the another
of the first molded article 102A, there is a further requirement for
shuttering of the in-mold
shutter 140 to engage the first mold shoe 130 to the moving platen 912 (FIG.
1).
In view of the foregoing, those persons of skill in the art would undoubtedly
recognize
alternative non-limiting embodiments of the injection mold including one or
both of the
molded article transfer device 150 and/or an in-mold shutter 140. One such
example of an
alternative non-limiting embodiment may be appreciated with reference to the
injection mold
200 shown in FIG. 6A. The injection mold 200 is structured similarly to the
injection mold
100 of FIG. 5A, and as such only the differences of construction and operation
thereof will be
described in detail in the description that follows.
The injection mold 200 includes an alternative non-limiting embodiment of a
first mold half
196, and the second mold half 98 described previously.
The first mold half 196 of the injection mold 200 includes the same in-mold
shutter 140 and
molded article transfer device 150 that were described previously, between
which an
alternative non-limiting embodiment of a first mold shoe 230 is arranged.
The first mold shoe 230 is structured to have a first stack portion 210 of a
first mold stack
206A connected thereto. Much the same as the first stack portion 110 described
previously,
the first stack portion 210 of the first mold stack 206A includes an inner
core 212, an outer
core 214, and the stripper sleeve 116, as described previously, that
cooperate, in use, with the
cavity insert 122 of the second stack portion 120 to define the molding cavity
101. As such,
the outer core 214 is slidably arranged around the inner core 212 to
accommodate, in use,
relative movement thereof along the mold-stroke axis X. Likewise, the stripper
sleeve 116 is
slidably arranged around the outer core 214 to accommodate, in use, the
relative movement
thereof along the mold-stroke axis X.
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Much like the first mold shoe 130 described previously, the first mold shoe
230 includes a
first core retainer 232 and a stripper retainer 236 that are slidably
connected together to
accommodate the relative movement thereof, in use, along the mold-stroke axis
X, wherein
the inner core 212 is connected to the first core retainer 232, and the
stripper sleeve 116 is
connected to the stripper retainer 236. The stripper sleeve 116 is fixedly
arranged in a
passageway 237 that is defined in the stripper retainer 236. More
particularly, the stripper
retainer 236 includes a base plate 234 and the top plate 135, as described
previously, that are
fastened together, in use, with the passageway 237 being defined therethrough,
wherein the
flange portion 123 of the stripper sleeve 116 is retained between the base
plate 234 and the
top plate 135. The outer core 214 is slidably arranged within the passageway
237 to
accommodate relative movement between the outer core 214 and the stripper
sleeve 116, in
use, along the mold-stroke axis X, with the movement of the outer core 214,
from an outer
core molding position (FIG. 6A) to a stripping position (FIG. 6E).
The first mold shoe 230 further includes a second core retainer 233. The
second core retainer
233 is slidably connected between the first core retainer 232 and the stripper
retainer 236 to
accommodate the relative movement thereto, in use, along the mold-stroke axis
X. The outer
core 214 is connected to the second core retainer 233 for movement therewith.
With reference to FIG. 6B, the first mold shoe 230 also includes the stripper
actuator 153, as
described previously, except that in this non-limiting embodiment it serves to
connect the
stripper retainer 236 with the second core retainer 233, the stripper actuator
153 being
operable, in use, to drive the relative movement thereof along the mold-stroke
axis X.
Furthermore, the first mold shoe 230 includes a core actuator 255 that
connects the first core
retainer 232 and the second core retainer 233, the core actuator 255 being
operable, in use, to
drive the relative movement thereof along the mold-stroke axis X. Lastly, the
second core
retainer 233 is shown to be connected, in use, with the ejector actuator 922
of the mold
clamping assembly 996 (FIG. 1) for movement thereof, in use, along the mold-
stroke axis X.
The start-up and production molding processes for the injection mold 200 are
similar to those
described previously. That being said, the production molding process for the
injection mold
200 will be further described owing to the differences in execution of the
various actuators
that are connected to the first mold shoe 230.
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The production molding process begins, as shown in FIG. 6A, with the injection
mold 200
being positioned in the mold closed configuration C with the first mold shoe
230 being
positioned, along the mold-stroke axis X, in an extended position E such that
the first mold
stack 206A is closed to define the molding cavity 101 therein. In so doing,
the first mold stack
206A is arranged within the first aperture 156A that is defined by the shuttle
154 of the
molded article transfer device 150, the first aperture 154A being positioned
in the first
receiving position R. Furthermore, the shutter member 144 of the in-mold
shutter 140 is in the
shut position S, whereby the first mold shoe 230 is engaged with the moving
platen 912 (FIG.
1). Accordingly, the injection mold 200 is configured for molding of the first
molded article
102A (not shown). Thereafter, molding of the first molded article 102A (not
shown) is
performed with injection of molding material into the molding cavity 101.
The production molding process next includes, as shown with reference to FIG.
6B, and as
described previously, the un-shuttering of the in-mold shutter 140 to
disengaged the first mold
shoe 130 from the moving platen 912 (FIG. 1).
The production molding process next includes, as shown with reference to FIG.
6C, opening
of the first mold stack 206A with retracting the first stack portion 210,
along the mold-stroke
axis X, to position the first molded article 102A that is arranged thereon in
the first aperture
156A. This involves retracting the stripper retainer 236, the second core
retainer 233, and the
first core retainer 232, in tandem, along the mold-stroke axis X, and thus the
retracting of the
inner core 112, the outer core 114, and the stripper sleeve 116 that are
retained thereto,
respectively. The foregoing movements are provided through control of the
ejector actuator
922 for retracting of the second core retainer 233, wherein the first core
retainer 232 and the
stripper retainer 236 follow, in tandem, by virtue of further control of the
core actuator 255 to
hold the first core retainer 232 in contact with a bottom face of the second
core retainer 233,
and likewise, control of the stripper actuator 153 to keep the stripper
retainer 236 in contact
with a top face of the second core retainer 233.
The production molding process next includes, as shown with reference to FIG.
6D, a first
stage of arranging the first stack portion 210 to eject the first molded
article 102A into the
first aperture 156A of the shuttle 154, and more particularly the stripping of
the seal portion
103 of the first molded article 102A from where it was molded in between the
inner core 212
and the outer core 214 with relative movement thereof. To do so, involves
holding the
position of the stripper retainer 236, to keep the stripper sleeve 116 that is
fixed thereto
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immobile, whereby the first molded article 102A is held in the first aperture
156A, while
further holding of the position of the second core retainer 233, to keep the
outer core 114 that
is fixed thereto immobile, and then retracting the first core retainer 232
relative thereto, and in
effect retract the inner core 112 that is retained thereon relative to the
outer core 114, along
the mold stroke axis X, a distance that is sufficient to strip the seal
portion 103. To do so, the
position of the second core retainer 233 is held through control of the
ejector actuator 922,
while the position of the stripper retainer 236 is held through control of the
stripper actuator
153 to keep the stripper retainer 236 in contact with the top face of the
second core retainer
233. The movement of the first core retainer 132 is provided through control
of the core
actuator 255 to retract the first core retainer 232 relative to the second
core retainer 233.
The production molding process next includes, as shown with reference to FIG.
6E, a final
stage of arranging the first stack portion 210 to eject the first molded
article 102A into the
first aperture 156A of the shuttle 154, and furthermore retracting of the
first stack portion 210
from the first aperture 156A. To do so involves continuing to hold the
position of the stripper
retainer 236, to keep the stripper sleeve 116 that is fixed thereto immobile,
whereby the first
molded article 102A is held in the first aperture 156A, and then retracting,
in tandem, the first
core retainer 232 and the second core retainer 233 relative thereto, and in
effect retract the
inner core 212 and the outer core 214 that are retained thereon relative to
the stripper sleeve
116. The first molded article 102A is stripped from the outer core 214 as it
is held in the first
aperture 156A, through supporting contact with a top of the stripper sleeve
116, and the outer
core 214 is retracted therefrom with its retraction to the stripping position.
The foregoing
involves coordinated control of the stripper actuator 153 and of the ejector
actuator 922,
wherein the stripper actuator 153 and the ejector actuator 922 are directed to
extend with
equal displacement, and in the opposite directions, while the core actuator
255 is controlled to
maintain the position of the first core retainer 232 relative to the second
core retainer 233, and
in effect retract therewith.
The production molding process next includes, as shown with reference to FIG.
6F, and as
described previously, shuttling of the shuttle 154 to transfer the first
molded article 102A
within the first aperture 156A.
The production molding process ends, as shown with reference to FIG. 6G, with
the passing
of the first molded article 102A along the first channel 160A towards the exit
164 (FIG. 3)
thereof (shown only by virtue of the disappearance of the first molded article
102A from the
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first channel 160A), and closing of the first mold stack 206A. The closing of
the first mold
stack 206A involves rearranging the first mold shoe 230 into the extended
position E with
extension of the first core retainer 232, the second core retainer 233, and
the stripper retainer
236, along the mold stroke axis X, to position the inner core 212, the outer
core 214, and the
stripper sleeve 116 that are retained thereon into their respective molding
positions. The
foregoing movements are provided through control of the ejector actuator 922
for extending
of the second core retainer 233, wherein the first core retainer 232 and the
stripper retainer
236 follow, in tandem, by virtue of further control of the core actuator 255
to bring the first
core retainer 232 into contact with the bottom face of the second core
retainer 233, and
likewise, control of the stripper actuator 153 to bring the stripper retainer
236 into contact
with the top face of the second core retainer 233. In so doing, the first
stack portion 210 is
arranged within the second aperture 156B that is defined by the shuttle 154 of
the molded
article transfer device 150, the second aperture 154B being positioned in the
first receiving
position R. While not shown, prior to molding of the another of the first
molded article 102A,
there is a further requirement for shuttering of the in-mold shutter 140 to
engage the first
mold shoe 230 to the moving platen 912 (FIG. 1).
Another alternative non-limiting embodiment may be appreciated with reference
to the
injection mold 200 without the in-mold shutter 140 as shown in FIG. 7A. That
is, the injection
mold 200 is the same as that previously described except for removal of the in-
mold shutter
140, and as such the first mold shoe 130 thereof is structured for direct
mounting to the
moving platen 912 (FIG. 1).
The start-up and production molding processes for the reconfigured injection
mold 200 are
similar to that described previously. That being said, the production molding
process for the
injection mold 200 will be further described for sake of differences in
execution of the various
actuators that are connected to the first mold shoe 230, and more particularly
owing to the
further involvement of the platen-moving actuator 915.
The production molding process begins, as shown in FIG. 7A, with the
reconfigured injection
mold 200 being positioned in the mold closed configuration C with the first
mold stack 206A
closed to define the molding cavity 101 therein. In so doing, the first mold
stack 206A is
arranged within the first aperture 156A that is defined by the shuttle 154 of
the molded article
transfer device 150, the first aperture 154A being positioned in the first
receiving position R.
Accordingly, the reconfigured injection mold 200 is configured for molding of
the first
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molded article 102A (not shown). Thereafter, molding of the first molded
article 102A (not
shown) is performed with injection of molding material into the molding cavity
101.
The production molding process next includes, as shown with reference to FIG.
7B, opening
of the first mold stack 206A with positioning of the first mold half 196 and
the second mold
half 98, along the mold-stroke axis X, into the mold open configuration 0, and
holding the
position of the molded article transfer device 150 in relation to the second
mold half 98,
wherein the first molded article 102A that is arranged on the first stack
portion 210 is
positioned in the first aperture 156A. The positioning of the first mold half
196 and the
second mold half 98 involves un-shuttering of the clamp shutter 920 (FIG. 1)
and positioning
of the moving platen 912 (FIG. 1) away from the stationary platen 914 (FIG. 1)
through
control of the platen-moving actuator 915 (FIG. 1). Furthermore, the opening
involves control
of the ejector actuator 922 and the core actuator 255 to fix the positions of
the first core
retainer 232, the second core retainer 233, and the stripper retainer 236
relative to the moving
platen 912 for movement therewith. The holding the position of the molded
article transfer
device 150 in relation to the second mold half 98 involves coordinated control
of the stripper
actuator 153 and the platen-moving actuator 915, wherein the stripper actuator
153 is directed
to extend with equal displacement and in the opposite direction to the platen-
moving actuator
915 with the positioning of the first mold half 196 and the second mold half
98 into the mold
open configuration 0.
The production molding process next includes, as shown with reference to FIG.
7C, a first
stage of arranging the first stack portion 210 to eject the first molded
article 102A into the
first aperture 156A of the shuttle 154, and more particularly the stripping of
the seal portion
103 of the first molded article 102A from where it was molded in between the
inner core 212
and the outer core 214 with relative movement thereof. To do so, involves
holding the
position of the stripper retainer 236, to keep the stripper sleeve 116 that is
fixed thereto
immobile, whereby the first molded article 102A is held in the first aperture
156A, while
further holding of the position of the second core retainer 233, to keep the
outer core 114 that
is fixed thereto immobile, and then retracting the first core retainer 232
relative thereto, and in
effect retract the inner core 112 that is retained thereon relative to the
outer core 114, along
the mold stroke axis X, a distance that is sufficient to strip the seal
portion 103. The foregoing
involves coordinated control of the core actuator 255, the ejector actuator
922, and the platen-
moving actuator 915, wherein the core actuator 255 and the ejector actuator
922 are directed
to extend with equal displacement, and in the opposite direction, to the
platen-moving
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actuator 915 while the stripper actuator 153 is controlled to maintain the
position of the
molded article transfer device 150 relative to the second mold half 98.
The production molding process next includes, as shown with reference to FIG.
7D, a final
stage of arranging the first stack portion 210 to eject the first molded
article 102A into the
first aperture 156A of the shuttle 154, and furthermore retracting of the
first stack portion 210
from the first aperture 156A. To do so involves continuing to hold the
position of the stripper
retainer 236, to keep the stripper sleeve 116 that is fixed thereto immobile,
whereby the first
molded article 102A is held in the first aperture 156A, and then retracting,
in tandem, the first
core retainer 232 and the second core retainer 233 relative thereto, and in
effect retract the
inner core 212 and the outer core 214 that are retained thereon relative to
the stripper sleeve
116. The first molded article 102A is stripped from the outer core 214 as it
is held in the first
aperture 156A, through supporting contact with a top of the stripper sleeve
116, and the outer
core 214 is retracted therefrom with its retraction to the stripping position.
The foregoing
involves coordinated control of the ejector actuator 922 and the platen-moving
actuator 915,
wherein the ejector actuator 922 is directed to extend with equal
displacement, and in the
opposite direction, to the platen-moving actuator 915 while the stripper
actuator 153 is
controlled to maintain the position of the molded article transfer device 150
relative to the
second mold half 98 and the core actuator 255 is controlled to maintain the
position of the
second core retainer 233 relative to the first core retainer 232.
The production molding process next includes, as shown with reference to FIG.
7E, and as
described previously, shuttling of the shuttle 154 to transfer the first
molded article 102A
within the first aperture 156A.
The production molding process ends, as shown with reference to FIG. 7F, with
the passing of
the first molded article 102A along the first channel 160A towards the exit
164 (FIG. 3)
thereof (shown only by virtue of the disappearance of the first molded article
102A from the
first channel 160A), and the closing of the first mold stack 206A. The closing
of the first mold
stack 206A involves closing of the first mold shoe 230 and positioning of the
first mold half
196 and the second mold half 98, along the mold-stroke axis X, into the mold
closed
configuration C. In so doing, the first mold stack 206A is arranged within the
second aperture
156B that is defined by the shuttle 154 of the molded article transfer device
150, the second
aperture 154B being positioned in the first receiving position R. The closing
of the first mold
shoe 230 involves the coordinated control of the stripper actuator 153, the
ejector actuator
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922 (FIG. 1) and the core actuator 255 to retract, along the mold-stroke axis
X, the molded
article transfer device 150 into contact with the stripper retainer 236, the
stripper retainer 236
into contact with the second core retainer 233, and the second core retainer
233 into contact
with the first core retainer 232. The positioning of the first mold half 196
and the second mold
half 98 involves positioning of the moving platen 912 (FIG. 1) towards the
stationary platen
914 (FIG. 1) through control of the platen-moving actuator 915 (FIG. 1) and
shuttering of the
clamp shutter 920 (FIG. 1). While not shown, prior to molding of the another
of the first
molded article 102A, there is a further requirement for shuttering of the in-
mold shutter 140
to engage the first mold shoe 230 to the moving platen 912 (FIG. 1).
Yet another alternative non-limiting embodiment may be appreciated with
reference to the
injection mold 300 shown in FIG. 8A. The injection mold 300 is structured
similarly to the
injection mold 100 of FIG. 5A, and as such only the differences of
construction and operation
thereof will be described in detail in the description that follows.
The injection mold 300 includes an alternative non-limiting embodiment of a
first mold half
296, and the second mold half 98 described previously.
The first mold half 296 of the injection mold 300 includes the same in-mold
shutter 140 that
was described previously, an alternative non-limiting embodiment of a molded
article transfer
device 250, between which another alternative non-limiting embodiment of a
first mold shoe
330 is arranged.
The first mold shoe 330 is structured to have a first stack portion 310 of a
first mold stack
306A connected thereto. Much the same as the first stack portion 110 described
previously,
the first stack portion 310 of the first mold stack 306A includes an inner
core 312, an outer
core 314, and a stripper sleeve 316, that cooperate, in use, with the cavity
insert 122 of the
second stack portion 120 to define the molding cavity 101. As such, the outer
core 314 is
slidably arranged around the inner core 312 to accommodate, in use, relative
movement
thereof along the mold-stroke axis X. Likewise, the stripper sleeve 316 is
slidably arranged
around the outer core 314 to accommodate, in use, the relative movement
thereof along the
mold-stroke axis X.
Much like the first mold shoe 130 described previously, the first mold shoe
330 includes a
first core retainer 332 and a stripper retainer 336 that are slidably
connected together to
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accommodate the relative movement thereof, in use, along the mold-stroke axis
X, wherein
the inner core 212 is connected to the first core retainer 232, and the
stripper sleeve 316 is
arranged within the stripper retainer 336.
The inner core 312 and the outer core 314 are slidably retained together in
the same manner
to as the inner core 112 and the outer core 114 that were described
previously, and as such, are
kept rotatably engaged within the first mold shoe 330 by the key 119 that is
associated with
the stripper retainer 336.
In contrast to the injection mold 100, wherein the stripper sleeve 116 is
fixedly retained to the
stripper retainer 136 for movement therewith, the stripper sleeve 316 of the
injection mold
300 is slidably arranged within a passageway 337 that is defined in the
stripper retainer 336
and as such is movable relative thereto to accommodate, in use, movement
thereof, along the
mold-stroke axis X, from the stripper sleeve molding position (FIG. 8A) to the
ejection
position (FIG. 8C). Furthermore, the stripper sleeve 216 defines a piston
portion 218 that is
slidably received in a piston cylinder 272 that is defined in a base plate 270
of the molded
article transfer device 250. The base plate 270 further defines a channel 274
therein with
which to connect, in use, the piston cylinder 272 with a source or sink of a
working fluid (e.g.
air, hydraulic fluid, etc.).
In further contrast to the injection mold 100, the stripper retainer 236 of
the injection mold
300 is connected to a bottom face of the base plate 270, wherein a top face
235 of the stripper
retainer 236 is arranged to retain, in use, the piston portion 218 of the
stripper sleeve 316 in
the piston cylinder 272 and to otherwise provide a rear limit of travel for
the stripper sleeve
316 that corresponds with an ejection position thereof.
In operation, the stripper sleeve 316 is biased to move from the stripper
sleeve molding
position towards the ejection position, along the mold-stroke axis X, with
connection of the
channel 274 to the source of the working fluid and thus is able to retract
with the outer core
314. The stripper sleeve 316 is otherwise pushed back to the stripper sleeve
molding position,
along the mold-stroke axis X, by the outer core 314, wherein a shoulder 315
that is defined on
the outer core 314 engages a bottom face of the piston portion 218.
The structure and operation of the molded article transfer device 250 is
otherwise the same as
the molded article transfer device 150 that was described previously.
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The production molding process for the injection mold 300 will be discussed
next.
The production molding process begins, as shown in FIG. 8A, with the injection
mold 300
being positioned in the mold closed configuration C with the first mold shoe
330 being
to positioned, along the mold-stroke axis X, in an extended position E such
that the first mold
stack 306A is closed to define the molding cavity 101 therein. In so doing,
the first mold stack
306A is arranged within the first aperture 156A that is defined by the shuttle
154 of the
molded article transfer device 250, the first aperture 154A being positioned
in the first
receiving position R. Furthermore, the shutter member 144 of the in-mold
shutter 140 is in the
shut position S, whereby the first mold shoe 330 is engaged with the moving
platen 912 (FIG.
1). Accordingly, the injection mold 300 is configured for molding of the first
molded article
102A. Thereafter, molding of the first molded article 102A (not shown) is
performed with
injection of molding material into the molding cavity 101.
The production molding process next includes, as shown with reference to FIG.
8B, and as
described previously, the un-shuttering of the in-mold shutter 140 to
disengaged the first mold
shoe 330 from the moving platen 912 (FIG. 1).
The production molding process next includes, as shown with reference to FIG.
8C, opening
of the first mold stack 306A with retracting the first stack portion 310,
along the mold-stroke
axis X, to position the first molded article 102A that is arranged thereon in
the first aperture
156A. This involves retracting the first core retainer 332, along the mold-
stroke axis X,
whereby the inner core 112 that is connected thereto is retracted, along with
the outer core
314 that is arranged thereon, and furthermore connecting the channel 274 to
the source of
working fluid to bias the stripper sleeve 316 to retract with the outer core
314. The retracting
of the first core retainer 332 is provided through control of the ejector
actuator 922.
The production molding process next includes, as shown with reference to FIG.
8D, a first
stage of arranging the first stack portion 310 to eject the first molded
article 102A into the
first aperture 156A of the shuttle 154, and more particularly the stripping of
the seal portion
103 of the first molded article 102A from where it was molded in between the
inner core 312
and the outer core 314 with relative movement thereof. The foregoing operation
is made
simple, relative to the foregoing non-limiting embodiments, in that it
requires only retracting
of the first core retainer 132, through control of the ejector actuator 922,
to retract the inner
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core 112 that is retained thereon, along the mold stroke axis X, a distance,
relative to the outer
core 114 which is kept immobile by virtue of being arranged within the first
molded article
102A, that is sufficient to strip the seal portion 103.
The production molding process next includes, as shown with reference to FIG.
8E, a final
stage of arranging the first stack portion 310 to eject the first molded
article 102A into the
first aperture 156A of the shuttle 154, and furthermore retracting of the
first stack portion 110
from the first aperture 156A. The foregoing involves retracting the first core
retainer 332,
along the mold stroke axis X, into the retracted position B, through control
of the ejector
actuator 922, to retract the inner core 112 that is retained thereon a
distance that is sufficient
to further move the outer core 314 into stripping position by virtue of the
inner core 312
having reached its rearward limit of travel relative to the outer core 314.
The first molded
article 102A is stripped from the outer core 314 as it is held in the first
aperture 156A,
through supporting contact with a top of the stripper sleeve 116, and the
outer core 314 is
retracted therefrom with its retraction to the stripping position.
The production molding process next includes, as shown with reference to FIG.
8F, and as
described previously, shuttling of the shuttle 154 to transfer the first
molded article 102A
within the first aperture 156A.
The production molding process ends, as shown with reference to FIG. 8G, with
the passing
of the first molded article 102A along the first channel 160A towards the exit
164 (FIG. 3)
thereof (shown only by virtue of the disappearance of the first molded article
102A from the
first channel 160A), and closing of the first mold stack 306A. The closing of
the first mold
stack 306A involves connecting the channel 274 to the sink of the working
fluid and
rearranging the first mold shoe 330 into the extended position E with
extension of the first
core retainer 332, along the mold stroke axis X, through control of the
ejector actuator 922, to
extend the inner core 312 that is retained thereon into the inner core molding
position and in
so doing push the outer core 314 into the outer core molding position by
virtue of the inner
core 312 having reached its forward limit of travel relative to the outer core
114. In so doing,
the first stack portion 310 is arranged within the second aperture 156B that
is defined by the
shuttle 154 of the molded article transfer device 150, the second aperture
154B being
positioned in the first receiving position R. While not shown, prior to
molding of the another
of the first molded article 102A, there is a further requirement for
shuttering of the in-mold
shutter 140 to engage the first mold shoe 330 to the moving platen 912 (FIG.
1).
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Thus, having described the structure and operation of several non-limiting
embodiments of
the injection mold 100, 200, 300, having one or both of the molded article
transfer device
150, 250, and the in-mold shutter 140, those persons of skill in the art would
undoubtedly
recognize further alternative non-limiting embodiments thereof. And, whereas
the production
molding processes involving the foregoing have been conveyed in quite specific
terms, no
such limit on the generality and applicability thereof is intended. As such, a
molding process
600 involving the molded article transfer device 150, 250 and another molding
process 700
involving the in-mold shutter 140 will be presented next. These molding
processes may be
practiced separately or, as demonstrated previously, in concert with one
another.
A flow chart outlining the steps of the molding process 600 is shown with
reference to FIG. 9.
The molding process 600 begins with a closing 602 of the first mold stack
106A, 206A, 306A
of the injection mold 100, 200, 300 to define the molding cavity 101 therein,
wherein the first
mold stack 106A, 206A, 306A is arranged within the first aperture 156A that is
defined by the
shuttle 154 of the molded article transfer device 150, 250. Next, the molding
process 600
involves molding 604 of the first molded article 102A within the molding
cavity 101. Next,
the molding process 600 involves opening 606 of the first mold stack 106A,
206A, 306A to
retract it from the first aperture 156A. Next, the molding process 600
involves arranging 608
the first mold stack 106A, 206A, 306A to eject the first molded article 102A
into the first
aperture 156A of the shuttle 154. The molding process 600 ends with shuttling
610 of the
shuttle 154 to transfer the first molded article 102A within the first
aperture 156A.
A flow chart outlining the steps of the molding process 700 is shown with
reference to FIG.
10. The molding process 700 begins with closing 702 of the first mold stack
106A, 206A,
306A of the injection mold 100, 200, 300 to define the molding cavity 101
therein. Next, the
molding process 700 involves shuttering 704 of the in-mold shutter 140 to
engage the first
mold shoe 130, 230, 330 of the injection mold 100, 200, 300 with one of the
moving platen
912 and the stationary platen 914 of an injection molding system 900. Next,
the molding
process 700 involves molding 706 the first molded article 102A within the
molding cavity
101. Next, the molding process 700 involves un-shuttering 708 the in-mold
shutter 140 to
disengage the first mold shoe 130, 230, 330 from the one of the moving platen
912 and the
stationary platen 914. The molding process 700 ends with selectively
positioning 710 the first
mold shoe 130, 230, 330, along the mold-stroke axis X, whereby the first stack
portion 110,
210, 310 and a second stack portion 120 of the first mold stack 106A are
repositioned relative
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to each other substantially without relative movement between the moving
platen 912 and the
stationary platen 914 (i.e. although movement is not precluded).
The foregoing steps of the molding processes 600, 700 are executable, in
practice, on a
controller 501, as shown with reference to FIG. 3, such as the one that is
typically associated
FIGS. 11A and 11B depict an alternative non-limiting embodiment of an in-mold
shutter 240
for selectively engaging, in use, a first mold shoe 130 (only the first core
retainer 132 of
The in-mold shutter 240 includes a shutter member 244 that is slidably
coupled, for example,
to a support base (not shown), in the manner described previously with
reference to the
description of the in-mold shutter 140, or directly to the platen (not shown),
and a link
30 position S (FIG. 11A) and an open position U (FIG. 11B), respectively.
In operation, with the first mold shoe 130 having been positioned into the
extended position E
(FIG. 11A), the link member 246 is oriented to engage the first core retainer
132 of the first
mold shoe with the platen (not shown) in a manner that holds the first mold
shoe 130 in the
35 extended position E during molding of the first molded article 102A (not
shown). Where the
form of the link member 246 is a simple elongate body it is best able to
support (i.e. link an
applied mold clamping force between the first mold shoe and the platen) when
oriented
substantially parallel to the mold-stroke axis X.
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FIGS. 12A and 12B depict another alternative non-limiting embodiment of an in-
mold shutter
340 for selectively engaging, in use, a first mold shoe 130 (only the first
core retainer 132 of
which is shown) with a platen (not shown) of the mold clamping assembly (not
shown).
The in-mold shutter 340 includes a shutter member 344 that is slidably
coupled, for example,
to to a support base (not shown), in the manner described previously with
reference to the
description of the in-mold shutter 140, or directly to the platen (not shown),
and a link
member 346. The link member 346 includes two parts, namely a first wedge 347
and a second
wedge 349, wherein the first wedge 347 is associated with a shutter member 344
and the
second wedge 349 is associated with the first core retainer 132 of the first
mold shoe 130.
The first wedge 347 and the second wedge 349 are configured to define a
wedging interface
351 therebetween (across complementary angled faces thereof) that is operable
to translate
movement of the shutter member 344, by the shutter actuator (not shown),
between a shut
position S (FIG. 11A) and an open position U (FIG. 11B), into movement of the
first core
retainer 132 of the first mold shoe along the mold-stroke axis X.
In operation, with the shutter member 344 positioned in the shut position S,
as depicted with
reference to FIG. 12A, the first wedge 347 and the second wedge 349 of the
link member 346
are cooperable to engage the first mold shoe 130 with the platen in a manner
that holds the
first mold shoe 130 in the extended position E during molding of the first
molded article 102A
(not shown). Conversely, with the shutter member 344 positioned in the open
position U, as
depicted with reference to FIG. 12B, the first wedge 347 and the second wedge
349 are
spaced apart, thereby disengaging the wedging interface 351 therebetween,
whereby the first
core retainer 132 of the first mold shoe may be moved along the mold stroke
axis X between
the extended position E (FIG. 12A) and a retracted position B (FIG. 12B).
FIGS. 13A and 13B depict a further alternative non-limiting embodiment of an
in-mold
shutter 440 for selectively engaging, in use, a first mold shoe 430 (only the
first core retainer
432 of which is shown) with a platen (not shown) of the mold clamping assembly
(not
shown).
The in-mold shutter 440 includes a shutter member 444 that is slidably
coupled, for example,
to a support base (not shown), in the manner described previously with
reference to the
description of the in-mold shutter 140, or directly to the platen (not shown),
and a link
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member 446. The link member 446 includes two parts, namely a first key 447 and
a second
key 449, wherein the first key 447 is associated with a shutter member 444 and
the second
key 449 is associated with the first core retainer 132 of the first mold shoe
130. The in-mold
shutter 440 also includes a pair of keyways, namely a first keyway 455 that is
defined in the
first core retainer 132 of the first mold shoe 130 and a second keyway 453
that is defined in
the shutter member 444. The keys and keyways are positioned on their
respective supporting
structures wherein with the shutter member 444 positioned in an open position
U (FIG. 13B),
the first key 447 is recessable within the first keyway 455 and likewise the
second key 449 is
recessable within the second keyway 453, whereby the first mold shoe (130) is
movable along
the mold-stroke axis (X).
In operation, with the shutter member 444 positioned in a shut position S, by
means of the
shutter actuator (not shown), the first key 447 and the second key 449 of the
link member 446
are cooperable, across a supporting interface 451 that is defined
therebetween, to engage the
first mold shoe 130 with the platen in a manner that holds the first mold shoe
130 in the
extended position E during molding of the first molded article 102A (not
shown). Conversely,
with the shutter member 444 positioned in the open position U (FIG. 13B), by
means of the
shutter actuator, the first key 447 is recessable within the first keyway 455
and likewise the
second key 449 is recessable within the second keyway 453, whereby the first
mold shoe 130
is movable along the mold-stroke axis X between the extended position E (FIG.
13A) and a
retracted position B (FIG. 13B).
It may be furthermore noted that the shutter member 444 may further include,
as shown, an
array of first keys, included in which is the first key 447, and an array of
second keyways,
included in which is the second keyway 453, and likewise the first mold shoe
130 includes an
array of second keys, included in which is the second key 449, and an array of
first keyways,
included in which is the first keyway 455. Thus, with the first mold shoe 130
positioned in the
extended position E and the shutter member 444 positioned in the shut position
S, the array of
first keys and the array of second keys are cooperable to engage the first
mold shoe 130 with
the platen in a manner that holds the first mold shoe 130 in the extended
position E during
molding of the first molded article 102A (not shown). Likewise, with the
shutter member 444
positioned in an open position U, the array of first keys are recessable
within the array of first
keyways and the array of second keys are recessable within the array of second
keyways,
whereby the first mold shoe 130 is movable along the mold-stroke axis X.
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Lastly, with reference to FIG. 14 there is depicted yet a further alternative
non-limiting
embodiment of an in-mold shutter 540 for selectively engaging, in use, a first
mold shoe 130
(only the first core retainer 132 of which is shown) with a platen (not shown)
of the mold
clamping assembly (not shown).
The in-mold shutter 540 includes a shutter actuator 548 that is configured to
selectively
engage the first core retainer 132 of the first mold shoe 130 with the platen
(not shown) to
hold the first mold shoe 130 in an extended position E, along a mold-stroke
axis X, during a
step of molding a first molded article 102A (not shown). The actuator 548 may
be configured,
as shown, as any manner of linear actuator, such as, for example, a piston
actuator, wherein a
shutter member 544 defines a piston bore 559 within which to receive a piston
557, and that a
link member 546 (i.e. rod) further connects the piston 557 with the first core
retainer 132.
In operation, with the first mold shoe 130 positioned in the extended position
E, as shown, the
shutter actuator 548 is operable to extend the link member 546 to engage the
first mold shoe
130 with the platen (not shown) in a manner that holds the first mold shoe 130
in the extended
position E during molding of the first molded article 102A (not shown).
Conversely, the
shutter actuator 548 is further operable to retract the link member 546 to
effectively disengage
(i.e. no longer provides a load path) the first mold shoe 130 from the platen
(not shown).
It is noted that the foregoing has outlined some of the more pertinent non-
limiting
embodiments. These non-limiting embodiments may be used for many applications.
Thus,
although the description is made for particular arrangements and methods, the
intent and
concept of these non-limiting embodiments may be suitable and applicable to
other
arrangements and applications. It will be clear to those skilled in the art
that modifications to
the disclosed non-limiting embodiments can be effected. The described non-
limiting
embodiments ought to be construed to be merely illustrative of some of the
more prominent
features and applications thereof. Other beneficial results can be realized by
applying these
non-limiting embodiments in a different manner or modifying them in ways known
to those
familiar with the art. This includes the mixing and matching of features,
elements and/or
functions between various non-limiting embodiments is expressly contemplated
herein, unless
described otherwise, above.
39
