Note: Descriptions are shown in the official language in which they were submitted.
~51374
14656
PARISO~ H~NDLING ASSEM13LIl:S & ~EIHODS FOR HANDLING PARISC~S
~5-
88 ABSTRACT OF THE DISCLOSURE
A parison handling assembly receives tubular plastic parisons from
a random bulk storage, orients the parisons, and feeds the parisons in a controlJed
manner to one or more blow molding machines. Parisons are stored in the
random bulk storage and fed at a controlled rate by a metering apparatus to a
parison orienter which orients the parisons into a closely grouped arrangement
wherein the parisons are both upright and side-by-side. The parisons are fed
from the parison orienter to a parison escapement mechanism which holds the
parisons temporarily. The escapement mechanism is actuated to release parisons
into a parison transporter depending on the production demands of the individualblow-molding machines. Released parisons, from the parison escapement
mechanism, move along the parison transporter to be pushed axially into stuffer
tubes. The stuffer tubes hold the parisons in properly oriented, end-to-end
relationship for delivery to the actual loading station of the blow-molding
machine.
BACKGROUND OF THE INVENTION
This invention relates generally to handling and transporting
plastic articles, such as blowable plastic parisons, from a remote bulk storage
location to the load stations of one or more blow-molding machines.
The art of forming bottles and containers by blow-molding has
advanced to the stage where several thousands of such articles can be blown eachhour. Methods and apparatus have developed to form blowable parisons at one
location which are later transported to blow-molding machines. The freshly
formed parisons are initially stored randomly in a bulk container. This
necessarily requires that the blowable parisons, from which the articles are
blown, be transported rapidly and inexpensively to the load stations of the blow-
molding machines on aemand.
.
~51374
A problem has existed with the previous methods and
apparatus for parison handling in that much of the handling was
done manually and with apparatus which handled the parisons
roughly. Thus -the previous apparatus for handling parisons
tended to cause more than an acceptable amount of marking on
the parison bodies, which markings show as a defect in the
finally blown bottle. There was a need for reliable apparatus
tllat would quickly transport the parisons fror.l the bulk storage
to the blow molding machine on demand and without r,larking the
bodies of the parisons.
SU~ARY OF THE INVENTION
The present invention overcomes the previous problems
of transporting parisons from a remote bulk storage location to
the load stations of blow molding machines. The invention in-
cludes four components which, when interconnected, make up thetotal parison handling assembly. The four components are a
metering apparatus, a multi-lane parison orienter, a multi-lane
parison escapement mechanism, and a parison transporter mechanism.
Collectively, these four component mechanisms constitute the only
equipment necessary to move parisons from a bulk storage area to
load stations of the blow molding machines.
Now and in accordance with the specific teachings
presented herein, an improvement is provided in a blow molding
machine which has a load station and a feed tube connected to
the load station for receiving parisons with each of the parisons
having an open end, a neck portion and a closed end portion with
tlle parisons moving within the feed tube end-to-end so that the
closed end of one parison is nested into the open end of the next
successive parison. The improvement which is provided resides
in the means for aligning the parisons witll the open end of the
--2--
374
feed tube comprising a spring biased holder arm located on one
side of the path of movement of the parisons and a fluid
actuated aligning cylinder which ls located on the other side
of the path of movement of the parisons, the holder arm has
a notched portion that engages a parison neck portion, and a
roller is mounted on the aligning cylinder to engage a portion
of the parison opposite the portion engaged by the holder arm.
The present invention contemplates, but is not intended
to be limited to, the use of three blow molding machines. Since
any one machine, at any given time, may require feeding at a
different rate from the other machines, each machine is provided
with its own feed lanes. The metering apparatus conveyor, the
parison orienter, the parison excapement mechanism, and the
parison transporter, each have three feed lanes so that each
blow-molding machine is fed independently. The invention is not
limited to three blow molding machines, and the present invention
may be modified to provide feeding to a greater or lesser number
of blow-molding machines as desired.
-2a-
,...
~3~S1374 14656
The metering apparatus of the present invention has a three-lane
Dg8
conveyor which supplies a three-lane parison orienter. The conveyor receives
parisons at a controlled rate from a bulk storage container. One of the featuresof the present invention is that the number of parisons at the conveyor "take"
location is kept to a minimum to minimize any stirring and abrading action on
the parisons by the conveyor.
The parison pile is kept to a minimum by a unique control system
that causes the bulk storage container to dump parisons onto a load plate
intermediate the bulk container and three-lane conveyor. Parisons slide down
the load plate into the conveyor at a rate that will satisfy the requirements ofthe blow molding machines, but the number of parisons at the conveyor "take"
location is controlled to minimize marking of the parison bodies. The control
system is automatic, so that no operator attention is required while the metering
apparatus provides parisons to the three-lane orienter at a rate such that each of
the blow molding machines is capable of producing several thousand bottles per
hour.
The three-lane parison orienter receives the parisons from the
conveyor and orients them into a closely grouped, aligned arrangement wherein
the parisons are upright and side-by-side. Each lane of the parison orienter is
independently fed by a respective feed lane of the metering apparatus conveyor
Another feature of the present invention is that the parisons undergo minimal
vibrating, tumbling, and parison-to-parison contact because of the apparatus fororienting the parisons.
The parison orienter has three pairs of spaced rotating shafts, a
pair for each feed lane. Spaced slightly above and separating the pairs of
rotating shafts are inclined directing surfaces. As the parisons fall into an
individual lane, they are immediately directed between the pair of rotating
shafts in that lane. The parison end portions tend to fall through between the
~5137~ 14656
~8 rotating shafts because of gravity. The shafts are spaced apart a distance such
that only the parison end portions fall through between them, while the parison
neck portions, which are thicker than the end portions, are held by the rotatingshafts.
Many of the parisons are quickly oriented as they fall into the
orienter because their end portions immediately pass downwardly between the
rotating shafts. The shafts rotate to keep the unoriented parisons active until
their end portions also fall through between the shafts. There will be a very few
parisons that remain unoriented and are carried along with the oriented parisons.
A roller with a flexible wiper attached thereto lies transverse to
the parison feed path and is spaced slightly above the tops of the oriented
parisons. The oriented parisons pass underneath the roller, but the unoriented
parisons are kicked back until an opening in the line of oriented parisons permits
the end portions of the unoriented parisons to fall through. All the parisons that
pass under the roller are oriented.
The oriented parisons move along three lanes from the parison
orienter to a three-lane parison escapement mechanism. The parison escapement
mechanism will release parisons to a parison transporter depending on the
demand by the individual blow molding machines. A release mechanism is
mounted to the end of each escapement ieed lane. The release mechanisms are
actuated independently of each other by high-low switches on the stuffer tubes
feeding the load stations of the individual blow molding machines.
The release mechanisms of the parison escapement mechanism
provide gentle handling of the parisons and thereby minimize parison marking.
They also permit the parison feed lanes to be closely spaced together. The
release mechanisms are designed to release one parison at a time while holding in
place the other parisons of a respective feed lane.
14656
~51374
.085- A three-lane parison transporter receives the released parisons.08~
from the escapement mechanism. The parisons are transported along the feed
lanes of the parison transporter to be fed axially into stuffer tu~es. The stuffer
tubes hold the parisons in end-to-end contact, and the parisons are pushed
through the tubes to the actual load stations of the individual blow molding
machines.
The parison transporter uses ~all-away pushers that push the
parisons into the stuffer tubes and then clear away for following parisons. The
parisons are held by an aligning mechanism at the entry of a stuffer tube so that
the end portion of one parison properly nests into the open end of the next
parison. In the event of a jam-up, the transporter has a friction drive that
prevents damage.
Other advantages and meritorious features of this invention will
be more fully appreciated from the following detailed description and the
appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure I shows the overall parison handling assembly including a
parison metering apparatus, a three-lane parison orienter, a three-lane parison
escapement mechanism, and a three-lane parison transporter.
2 0 Figure 2 is a side elevational view of the parison metering
apparatus.
Figure 3 is a cross-sectional view taken along plane 3-3 of
Figure 2 showing the load plate and metering apparatus conveyor.
~51374
1~656
)85- Figure 4 is a side elevational view, with parts broken away and in
088
section, of the load plate and its connection to the control valve.
Figure 5 is a schematic representation of the control systern for
the metering apparatus.
S Figure 6 is a side elevational view of the three-lane parison
orienter.
Figure 7 is a cross-sectional view taken along plane 7-7 of
Figure 6 showing the three feed lanes and directing surfaces.
Figure 8 i5 a top plan view of the three-lane parison orienter.
Figure 9 is a cross-sectional view along plane 9-9 of Figure 8.
Figure 10 is a cross-sectional view along plane 10-10 of Figure 8
showing the exit portion of the three-lane parison orienter.
Figure 11 is a ~ront elevational view of the three-lane parison
escapement mechanism.
Figure 12 is a side elevational view of the three-lane parison
escapement mechanism.
Figure 13 is an enlarged, fragmentary, perspective view showing
of a typical release element.
Figure 14 is a side elevational view of the three-lane parison
2 0 transporter.
14656
~151374
.0o885- Figure 15 is a cross-sectional view taken along plane 15-15 of
Figure 14 showin~ the entrance to the stuffer tubes.
Figure 16 is an end Yiew taken along plane 16-16 of Figure 14
showing the pusher elements being cammed into operative position by cam rails.
S Figure 17 is an enlarged fragmentary perspective view showing a
pusher element and a holder element.
Figure 18 is an enlarged fragmentary perspective view showing
the rollers of the aligning cylinder.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
_
PARISON HANDLING ASSEMBLY
The overall parison handling assembly is shown in Figure 1 and it
includes: a parison metering apparatus 10, a 3-lane parison orienter 100, a 3-lane
parison escapement mechanism 200, and a 3-lane parison transporter 300, each of
which will be subsequently described in detail.
PARISON METERING APPARATUS
Referring to Figure 2, the metering apparatus 10 of the present
invention has as its basic components a single bulk hopper or container 20, a load
plate 29, and a conveyt)r 37. Parisons are metered from the hopper 20 onto the
load plate 29 and then into the conveyor 37.
14656
15137~
- The parisons are not directly fed from the hopper 20 into the8
conveyor 37 because it is important that the depth of the parison stack at the
conveyor intake 36 be kept to a minimum. This minimizes stirring and abrading
action from conveyor paddles 38 that tends to mark the parisons.
The parisons are stored in the hopper 20 in amounts sufficient to
satisfy the requirements of blow-molding machines which ultimately receive the
parisons. A blow molding machine produces approximately 2,000-7,200 bottles
per hour from the parisons, and the parison feeding must be such that there is
always a backlog sufficient to keep the blow-molding machines operational.
The bulk container 20 is pivotally mounted on pivot shaft 22 for
movement from the whole line position of Figure 2 to the phantom line
positions 60, 61 of Figure 2. Pivot shaft 22 is mounted at each of its ends to
support plates 26 (Figure 3). Support plates 26 are mounted to end mounting
plates 27 (Figure 3) at the ends of an elongated L-shaped beam 28, and the beam
28 is supported in fixed position by vertical struts 65 which are mounted to base
plate 66.
A fluid operated cylinder 23 having a piston rod 53 is attached at
one of its ends 24 to the frame 25 of the metering conveyor and the rod 53 is
attached at 21 to the bulk container 20. When the fluid cylinder 23 is actuated,it causes the bulk container 20 to pivot clockwise about pivot axis 22, dumping
parisons onto the load plate 29.
Referring to Figures 2-4, the load plate 29 serves as an interme-
diate parison slide member between the bulk container 20 and conveyor 37, and italso acts as a sensor to stop the bulk container from dumping more than the
desired number of parisons into the conveyor. As shown in Figures 2 and 4, the
load plate 29 is pivoted on one end on pivot shaft 19 and engages intake
1151374 14656
5_ member 36 on its other end. Parisons pile onto the upper surface of load plate 29
88
causing it to pivot downwardly under the parison weight. A turnbuckle 31 is
connected to load plate 29 at one end and is connected to link 32 at its other end.
When the load plate 29 pivots downwardly under the weight of
parisons, turnbuckle 31 transmits the downward movement to link 32. Link 32 is
fixed to pivot shaft 34 (Figure 3). Control arm 33 is also fixed to pivot shaft 34.
Downward pivoting of link 32 turns pivot shaft 34 clockwise which in turn causescontrol link 33 to push plunger 54 (Figure 4) of control valve 47 down. Tension
spring 35 is fixed at one end to channel member 28 and at its other end to
link 32, so that it applies a constant upward force on the load plate 29 (Figure 2).
When the bulk container is in phantom line position 60 of Figure 2, parisons slide
down load plate 29 into intake 36 of conveyor 37.
Conveyor 37 has three feed lanes to transport parisons, as best
seen in Figure 3. Each of the three lanes has a plurality of paddles 38 which
convey the parisons from the conveyor intake location at 36 to a discharge
location 46 (Figure 2). As shown in Figure 3, paddles 38 are mounted on conveyorbelts 67. After being discharged from the metering conveyor, the parisons are
dropped onto the three-lane parison orienter indicated at 100 in Figure 1.
Referring to Figure 2, conveyor 37 is mounted to base 25 by
support members 39, 40, 41 and drive rollers 42, 43, 44. As best seen in Figure 3,
the three lanes of paddles 38 are separated by dividers 49. As the parisons falldown the load plate 29 into the intake 36 of conveyor 37, they move along one ofthe three lanes of paddles to the discharge end 46 of the metering apparatus 10
and then in$o the three-lane orienter 100.
1~656
~15137~
~5- In Figure 5, there is illustrated a control circuit for controlling
0~8
the dumping of the hopper 20. This circuit includes a source of air under
pressure 58, the valve 47 which is responsive to the position of the hopper (as
above explained), a manual "off-on" valve 50, and the cylinder 23.
In operation, the manual valve is moved to its "on" position at
which the valve passage 52 connects the cylinder 23 with the source 58 so long as
the pivot plate 29 is not overloaded with parisons. The cylinder rod 52 is
extended by the air from the source 58 until the plate is loaded. The weight of
the parisons on the plate 29 pivots the plate downwardly against the bias of thespring 35 and the turnbuckle 31 depresses the actuating arm 33 to actuate
valve 47 to its "off" position at which valve passage 55 cuts off the cylinder 23
from the source 58. Thus, the hopper 20 is halted in its present, raised position.
As the parisons are removed from the plate 29 by the conveyor 37,
the spring 35 progressively moves the plate 29 and the arm 33 upwardly until
finally the valve passage 56 again interconnects the source 58 and the cylinder 23
for the next parison supply operation.
A unique control feature of the present invention is that control
valve 47 normally permits a small amount of fluid to vent or escape therethroughafter the bulk container is held in the phantom position 60 shown in Figure 2.
Once stopped at phantom line position 60, the bulk container pivots slowly
downwardly counterclockwise to the phantom line position 61 (Figure 2) because
of the fluid escape from control valve 47.
When the cylinder 23 is next actuated, the bulk container 29 is at
phantom line position 61. The hopper 29 pivots clockwise about pivot axis 22
from phantom line position 61 instead of position 60 where it initially was held.
The additional movement aids in the distribution of the parisons onto the load
plate 29. Of course as the bulk container 20 is emptied, the phantom positions 60
and 61 move further clockwise around pivot axis 22.
-10-
~51374 14656
~85- When it is desired to refill the bulk container, manual valve 50 is
08S
turned to its "off" position 51 which vents the cylinder 23 to reservoir 57 and
permits the bulk container 20 to pivot counterclockwise to its whole line position
of Figure 2.
THREE-LANE PAI~ISON ORIENTER
Parisons are discharged from the rnetering apparatus 10 by the
three lanes of conveyor 37. A parison orienter 100 receives the parisons from
the metering apparatus 10 for the purpose of orienting and then feeding them, in
a controlled manner, to a parison escapement mechanism, which will be
subsequently described.
As best seen in Figure 8, parisons from the three lanes of
conveyor 37 drop into three corresponding orienting lanes 101, 102, and 103 of
parison orienter 100. Each orienting lane has two power-driven shafts and two
inclined directing surfaces.
As best seen in Figure 7, orienting lane 101 has two power-driven
shafts 104, 105, and two inclined directing surfaces 1109 111; orienting lane 102
has two power-driven shafts 106, 107, and two inclined directing surfaces 112,
113; and orienting lane 103 has two power-driven shafts 108, 109 and two inclined
directing surfaces 114, 115.
Referring to Figure6, motor 116 drives belt 117 which rotates
drive pulley 118. Drive pulley 118 is directly connected to drive gear 120
(Figure 8). A plurality of gears 119-124 are intermeshed thereby forming a drive
train that is driven by drive gear 120. The gears of the drive train are each
respectively connected to power-driven shafts 104-109. Each of the intermeshed
-11-
14656
~15137~
085- gears of the drive train rotates in a direction opposite from that of its neighbor
.088
gear (Figure 8). This means that in each orienting lane the power-driven
shafts 104-109 are driven opposite one another and the drive directions are suchthat the shafts 109, 107, 105 rotate counterclockwise and the shafts 108, 106 and
104 rotate dockwise. The counter-rotating rolls of each set do not tend to pull
the parisons between the rolls. Rather, they provide moving, non-jamming
surfaces, retaining the parisons in motion during orientation.
In operation, parisons 11 drop into each of the three orienting
lanes to be oriented into an upright side-by-side arrangement. The spacing
between adjacent power-driven shafts 104-109 is such that the parison closed
ends 12 (Figure 7) can fall between the shafts but the finish areas 13 of the
parisons cannot. Therefore, when a random pile of parisons fall into each
orienting lane, certain of the parisons immediately orient themselves in an
upright position as seen in Figure 7 due to the parison closed ends 12 falling
between the power-driven shafts by gravity.
Other parisons 11 are able to orient themselves because the
power-driven shafts 104-109 tend to keep the random pile of parisons moving
along each respective lane until the parison closed ends can drop through
between the shafts and thereby become oriented. The parison orienter 100
provides quick, unique, and efficient upright orientation to a plurality of
randomly piled parisons.
Referring to Figures 1 and 6, a downward inclination, from left to
right, of the orienter 100 (not shown in Figure 6) causes the parisons to move
along the orienting lanes 101-103. Occasionally, parisons will not fit into one of
the oriented positions and as shown in Figure7, those parisons (Il') will lie
against the finish areas of parisons that have been oriented and will be fed along
the orienter until they reach roll 128.
~ iL51374 l4656
085- Referring to Figures 6 and 8, a transverse roll 128 is provided to
088
géntly push parisons, such as 11' shown in Figure7, rearwardly along the row of
oriented parisons where the closed ends of unoriented parisons 11' can drop
through between the power-driven shafts and become oriented. Roll 128 is
driven by motor 125 by way of drive belt 126. To prevent marking of the
parisons 11', roll 128 has two flexible rubber brushes 129 which extend radiallyoutwardly from the periphery of roll 128.
As seen in Figure 6, there is sufficient clearance for oriented
parisons 11 to pass underneath roll 128 and out of the reach of brushes 129;
however, if an unoriented parison 11' (Figure 7) is carried near roll 128, it will be
pushed back until its closed end can fall through between the power-driven
shafts. Any parisons that pass under roll 128 are of necessity in an upright
oriented position.
After being oriented, the parisons respectively move along one of
the lanes 101-103 until they move off the power-driven shafts 104-109 and onto
rails 130-135. As seen in Figure 8, parisons 11 move closer together as they
progress along rails 130-135 and they become more tightly grouped for the
purpose of being fed to an escapement mechanism which will be subsequently
described.
Referring to Figures 9 and 10, power-driven shafts 104-109 are
mounted for rotation at their lower, discharge ends by support members 136-141.
As the parisons 11 arrive at the ends of the power driven shafts supported by
vertical members 136-141, they pass under horizontal support member 142 as
seen in Figure 9 and move onto guide rails 130-135 as seen in Figure 10. The
outer guide rails 130, 131, 134 and 135 are bent inwardly toward guide rails 132,
133 (Figure 8) so that the parisons 11 are grouped into a tight arrangement whenthey leave the orienter 100 at discharge point 143 (Figure 8).
~1151374 14656
0~5_ The parison orienter 100 of the present invention is unique in its
088
simple but effective orientation of parisons received from a random bulk storage.
The parison orienter not only orients the parisons but also feeds them in a
controlled manner, quickly, and without excessive parison-to-parison contact or
undesirable marking of the parisons. The orienter is capable of orienting a wideva, iety of parison designs thereby expanding its utility to the fullest amount.
THREE LANE PARISON ESCAPEMENT
After the parisons 11 are oriented and moved into a closely-
grouped arrangement by the three-lane parison orienter, the parisons move along
rails 130-135 (Figure 8) to a three-lane escapement mechanism 200. The three
lanes of the escapement mechanism are individually controlled to release
parisons to a parison transporter, to be described.
The purpose of the three-lane escapement mechanism is to release
parisons individually from any one of the three escapement lanes in response to
the demand for parisons at the corresponding blow molding machine.
Referring to Figures 11-13, the parisons 11 are released from the
escapement mechanism 200 at the right end of the mechanism as shown in
Figure 12. The escapement mechanism 200 is inclined downwardly in the
discharge direction, i.e., ~rom left to right (Figure 1), so that when the parisons
are released, they drop onto a respective feed lane of the parison trans-
porter 300.
Referring to Figures 11-13, the parison escapement mechanism
includes an air cylinder 201 and separate release elements 230 for each lane.
The cylinders 201 and the release elements 230 are mounted to a support frame
2S 202. Parisons 11 are supported at their neck regions by rails 210 for sliding
-14-
~1~5137~ 14656
085- movement toward the end of parison escapement mechanism 200, and the
.0~8
parisons in each lane are in contact, the body portions of the parisons being
separated by the abutting, larger neck portions. Each parison lane is separated
by spacer and guide elements 211. The orientation and positioning of the
parisons are shown in Figure 12.
Each parison escapement lane has two superimposed release
elements 230 pivotally mounted to support frame 202 by pivot shafts 203. A
connecting link 204 connects each pair of release elements for simultaneous
pivotal movement.
Referring to Figure 13, each release element 230 includes a
release leg 229 and a stop leg 231 Iying at 90 to one another and joined by an
arcuate surface 230a of a radius larger than the radius of teh exterior surface of
the parison body portion. The pivoting of the elements 230 thus moves the stop
legs relative to the parison, without moving the parison itself. The lateral extent
of the leg 231 is preferably less than the distance between the body portions of
adjacent parisons for the same purpose. Each cylinder 201 has actuating rod 215
that is connected to leg 232 by shaft 216 of the release elements 230. The
bottom release elements are actuated by the cylinders 201, and pivotal
movement of the bottom release elements causes simultaneous pivotal movement
of the upper release elements through the connecting links 204.
The leading parison in each lane contacts the release legs 229 of
the pair of elements 230 for that lane, so that the parisons are retained normal
to the slope of the escapement lane solely by the elements. Upon actuation of
the individual cylinder 201, the two elements 230 are pivoted 90 about the
shafts 230. This pivotal movement drops the legs 229 from the path of the
leading parison and interposes the stop legs 231 between the leading parison and
the next successive parison. The leading parison then falls by gravity from the
~ .5~L374 1~656
~5_ escapement lane onto the transporter, while the next successive parison is held
~88
by the stop legs 231. The return stroke of the cylinder 201 repositions the
release legs 229 in front of the now-loading parison without releasing this
parison. Thus, for each stroke of each cylinder 201, a parison is individually
released from the escapement mechanism.
It will be noted, for purposes of fitting within space limitations,
the elements 230 are inverted and reversed for the release mechanism on the
right in Figure 11. The two left units release a parison upon extension of the
piston rods 215, the right unit releases upon retraction of its piston rod 215.
Otherwise, the function and structure of all the mechanisms is the same.
PARISON TRANSPORTER
The oriented parisons are released from the parison escapement
mechanism 200 to be fed by a parison transporter to the actual load station of ablow molding machine. The parison escapement mechanism has three lanes of
oriented parisons and the parison transporter also has three lanes. Each lane
carries individual parisons to a stuffer tube that holds the parisons end-to-end in
a line for feeding to a blow molding machine. Each line of parisons is pushed
through the individual stuffer tubes to the load station of a blow molding
machine.
Referring to Figure 14, the parison transporter 300 has a conveyor
structure 302 with a plurality of fall-away pushers 309 that rotate around the
path established by the conveyor. Each pusher element receives a released
parison from the escapement mechanism and conveys the parison to the entry
portion of the stuffer tube 330 where the parison is taken from the pusher
2 5 element and held in a nested position relative to a previously released and
transported parison.
llS1374 14656
D85- The parison transporter 300 has a generally rectangular support
088
frame 301 for a conveyor 302. Referring to Figures 14 and 16, the conveyor 302
has three drive sprockets 305 on one of its ends and three drive sprockets 306
(Figure 16) on its other end. Sprockets 305 are mounted on shaft 303 and
sprockets 306 are mounted on shaft 304. Three separate drive chains 307 span
the sprockets 305 and 306 to provide three lanes for parison transporting.
Secured to each of the chains at regular intervals are pushers 309,
each such pusher being pivoted to the chain on pivot pins 310. Each pusher
includes a bottom plate for contacting the bottom of a parison, an indined guideplate 326 to aid in seating the parison on the bottom plate and a stabilizing
extension 325 contacting a guide bar 311 for retaining the pusher 309 in position
with its bottom plate normal to the chain 307. A parison pad 308 is also provided
for each pusher, the pad being fixed to the chain in spaced relation to the pusher
and having an arcuate upper surface for conforming, supporting contact with
each parison supported on the adjacent pusher.
As seen in Figure 14, each parison released from the escapement
mechanism of Figures 11-13 falls by gravity onto the combination pad-pusher
immediately adjacent to the released parison. The release is timed to the
conveyor operation as later expJained, so that the relative positions of Figure 14
are always obtained. Since the pusher extension contacts the bar 311 at the
point of contact and throughout the conveyance of the parison by the conveyor,
the pad-pusher combination carries the parison upwardly.
As above explained, each lane of the conveyor carries each
parison from the escapement mechanism to an upper stuffer tube 330 which
communicates at its remote end with a molding apparatus. The stuffer tube 330
is loaded by means of a loading arm 312 bridging the gap between the tube and
the conveyor 300, this arm having an undersurface interposed in the path of the
14656
~1~137~
~5- parison as it is still supported on the pad-pusher combination.
)88
The arm 312 is urged toward the conveyor by a spring assembly
shown in Figure 15 and including a spring 315 and adjusting bolts 314. The
arm 312 has a retaining notch 313 which engages the neck ledge of each parison
as the parison is pushed under the arm by the conveyor, the arm moving away
from the conveyor against the force of the spring 315 as the parison passes under
the arm. The parison is confined under the arm, after the parison leaves the
conveyor, by a roller 321 on the end of a stabilizer arm 320 positioned by a fluid
pressure cylinder 322. The arm and cylinder resiliently support the rollers 321.The parisons are also supported upon support wedges 316 defining separate feed
lanes to the individual tubes 330.
The aligned, contacting parisons are stuffed into the tubes 330 by
the conveyor which displaces the parisons upwardly to an extent such that the
parison neck ledge is positioned at or beyond the notch 313. Thus, the column ofparisons in the tube 330 is supported by the bottom parison retained in the
notch 313.
OPERAllON
Referring to Figure 1, there will be described the overall
operation of the parison handling assembly.
Parisons are metered into conveyor 37 of the parison metering
apparatus 10 and conveyed to the parison orienter 100. The conveyor 37 receives
the parisons at a controlled rate due to the unique control systern including the
pivot plate 29 and the control valve 47, as previously described.
A 3-lane parison orienter 100 receives the parisons from conveyor
37 and orients them into a closely grouped arrangement wherein the parisons are
~ 151374 14656
5_ upright and side-by-side. As the parisons fall into an individual lane, they are
8
directed by surfaces 110-115 (Figure 8) between the respective power-driven
shafts 104-109. The roller 128 with flexible rubber wipers prevents unoriented
parisons from passing under it.
Sensor elements 401, pivotally connected by shaft 403 at the end
o the parison orienter, detect the presence or absence of parisons. Sensors 401are connected to conventional signaling apparatus such as limit switches (not
shown) which energize a control timer and relays 400. When one of the sensors
401 indicate a need for parisons, an air clutch 415 for that conveyor lane is
activated by control 400. A motor 402 drives the appropriate lane of conveyor
37 through the energized clutch 415. Control 400 includes a timer that keeps theconveyor 37 running for a pre-set time, approximately eight seconds, which has
been found to be sufficient for replenishing the supply of parisons to the orienter.
After leaving the parison orienter, the parisons are held by the
parison escapement mechanism 200 until demanded by a respective load station
411 of a blow-molding machine (not shown).
A high level proximity switch 413 and a low level proximity sw;tch
412 determine when the parison escapement mechanism 200 must release
parisons to the parison transporter 300. If no parisons are sensed by the low-
level switch 412, the parison transporter control 410 is energized, which in turn,
actuates the proper cylinder 201 (Figure 11~ to release parisons into transporter
300 and starts the transporter conveyor. After a sufficient number of parisons
backlog in the stuffer tubes 330, high level switch 413 energizes control 410 tostop any further parison release and to stop the conveyor.
It will be apparent to those skilled in the art that the foregoing
disclosure is exemplary in nature ra~her than limiting, the invention being limited
only by the appended claims.
