Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02447278 2003-11-20
PRINTER
Background of the Invention
This is a divisional of Canadian Patent Application No. 2,133,121, filed
September 28, 1994.
Field of the Invention
This invention relates to the field of printers and ink ribbon cartridges and
methods
pertaining thereto.
Brief Description of the Prior Art
The following prior art is made of record: U.S. patents Des. 327,495;
2,764,934;
3,774,538; 4,160,605; 4,479,730; 4,581,616; 4,609,298; 4,611,218; 4,655,623;
4,673,304;
4,685,815; 4,702,631; 4,776,714; 4,830,523; 4,832,514;4,899,172; 4,910,602;
4,914,452;
4,915,516; 4,924,242; 4,944,619; 4,957,379; 4,970,531; 5,035,325; 5;128,763;
and British
patent 1,455,915.
Summary of the Invention
The invention relates to an improved, user-friendly, compact, portable, small-
footprint, easy-to-use printer.
It is a particular feature of the invention of the divisional to provide a
printer
having a housing, a print head and a cooperable platen. The housing has space
for a supply
roll of a composite label web, including labels releasably adhered to a Garner
web, a toggle
mechanism releasably holding the print head in cooperation with the platen,
and having a
pair of slots. The slots are disposed so that the printed label can proj ect
through one of the
slots and the carrier web from which labels have been removed can project
through the
other slot.
A feature of the invention is an improved ink ribbon cartridge. A specific
embodiment of the cartridge is comprised of a cartridge housing with a
stationary shaft
and a brake member on the shaft in frictional contact with an inner surface of
a core of an
ink ribbon roll. The brake member cooperates with the core to prevent an
excessive
amount of ink ribbon to be paid out during the printing operation and to
maintain tension
in the rink ribbon.
Another feature of the invention is the new use of a tubular member as a brake
member cooperating with the inner surface of a core of an ink ribbon roll.
CA 02447278 2003-11-20
7 1
Another feature of the invention resides in an
.improved arrangement for coupling an ink ribbon cartridge
into a printer. In a specific embodiment, the ink ribbon
cartridge includes a housing with first and second housing
members spaced apart to provide an opening. The print head
has a line of printing elements and is mounted on a support:
The cartridge is mounted onto the printer so that the
support and the print head enter the opening between the
housing members of the cartridge.
It is another feature of the invention for the
cartridge to have a flexible resilient housing wall within
which the ink ribbon is based. The housing wall deflects
resiliently while the cartridge is being inserted until the
housing wall encounters a recess which causes the cartridge
to detest essentially into its operating position.
It is a feature of the invention to provide an
improved arrangement for detesting a cartridge in a printer.
It is a feature of the invention to provide an ink
ribbon cartridge that forms part of an improved housing
assembly of a printer. In a specific embodiment, a portion
of the cartridge is received in the printer housing and
another portion extends outside the printer housing. The
print head is mounted on a support and the cartridge has as
opening for receiving the support. The printer, thus, has
a very compact organization.
It is a feature of the invention to provide an
improved housing assembly for a printer in which the printer
includes a printer housing and an ink ribbon cartridge
coupled to the printer housing. In a specific embodiment,
the cartridge is located and latched in its operating
position, preferably by a toggle mechanism.
It is a another feature of the invention to provide a
thermal printer operable in both thermal direct and thermal
transfer modes, wherein an ink ribbon cartridge housing is
2
CA 02447278 2003-11-20
x
effective for forming a portion of the guideway for the web
to be printed upon and for providing part of the printer
housing during operation in the thermal direct mode, and
wherein the cartridge housing is effective additionally for
supplying ink ribbon to the thermal print head during
operation in the thermal transfer mode.
Other features of the invention will be evident to one
skilled in the art by reference to the drawings, the
following description and the appended claims.
Brief Description of the Drawings
FIGURE 1 is a perspective view of the printer of the
invention;
FIGURE 2 is a vertical sectional view of the printer;
FIGURE 3 is a view similar to FIGURE 2 but showing the
printer in its open position and showing the ink ribbon
cartridge exploded away;
FIGURE 4 is an exploded perspective view of a mounting
section and a print head assembly mounted by the mounting
section;
FIGURE 5 is an exploded perspective view of a housing
section which mounts the mounting section of FIGURE 4;
FIGURE 6 is an assembled view of the mounting section
and print head assembly shown in FIGURE 4 and the mounting
section shown in FIGURE 5;
FIGURE 7 is an exploded perspective view of an
assembly for latching the ink ribbon cartridge and for
guiding a carrier web of composite label web;
FIGURE 8 is an enlarged sectional view of the assembly
shown in FIGURE 7 and associated components;
FIGURE 9 is a fragmentary view showing the manner in
which the print head is located relative to the platen;
FIGURE 10 is an exploded perspective view showing the
drive mechanism for the printer and the ink ribbon
cartridge;
3
CA 02447278 2004-06-30
FIGURE 11 is an exploded perspective view of the ink
ribbon cartridge;
FIGURE 12 is an exploded rotated perspective of
cartridge housing sections shown in FIGURE 11;
FIGURE 13 is a sectional view of the cartridge showing
a brake;
FIGURE 14 is a view showing a fragmentary portion of
the cartridge and a drive spindle; and
FIGURE 15 is a rear elevational view of the cartridge.
Detailed Description of the Preferred Embodiment
With reference to FIGURES 1 and 2, there is shown a
printer generally indicated at 20 which includes a housing
generally indicated at 21. The printer 20 has a relatively
small footprint so that its base 22 only occupies a small area
on a supporting surface. The housing 21 extends generally
vertically, as shown with its vertical extent being elatively
long. The printer 20 can also be worn by an operator using a
suitable carrying strap (not shown). The housing 21 and a
housing 23 of an ink ribbon cartridge generally indicated at
24 form a housing assembly 25.
The housing mounts an on/off switch 26, a light 27 for
showing whether the printer 20 is "on" or "off", and certain
printer error conditions, and aligned recesses 28 (only one of
which is shown) at opposite sides of the housing for
connecting the ends of the carrying strap to the housing 21.
With reference to FIGURE 2, the housing 21 is shown to
removably mount a battery pack 29 containing a series of
rechargeable batteries 30. A spring-urged latch 31 releasably
holds the battery pack 29 in position. The housing 21 also
mounts electronic controls generally indicated at 32.
The housing 21 mounts a pair of opposed hub members 33,
only one of which is shown, for mounting a roll R of
4
CA 02447278 2004-06-30
record members. The illustrated roll R is shown to be a
composite web C comprised of a carrier web W and labels L
releasably adhered to the carrier web W along its length.
However, the roll R can alternatively be comprised of a web of
tags (not shown). The housing 21 has a chamber 33' which
receives the roll R. The chamber 33 is comprised of opposed
concave arcuate walls 34 and 35. The wall 34 merges with a
guide 36 which helps guide the composite web C (or the tag web
as the case may be) from the roll R to between a print head 37
and a platen roll 38. The housing 21 (FIGURE 2) also includes
mounting sections 39 and 40. The mounting section 39 is
pivotally mounted on posts 41 received in opposed holes 42.
The mounting section 39 includes the wall 35. The mounting
section 40 is pivotally connected to the mounting section 39.
The mounting section 40 has a generally vertically extending
outer wall portion 43 and a shelf or generally horizontally
extending portion 44. The shelf 44 has a pair of spaced arm
or support portions 44' (FIGURE 4) which mount the cartridge
24. The arm portions 44' are received in respective U-shaped
channels 130u and 131u in the cartridge housing 23 (FIGURE 3).
The channel 130u is comprised of ribs 130a, 130b and 130c, and
the channel 131u is comprised of ribs 131a, 131b and 131c.
The shelf 44 mounts a print head assembly 45. The ink ribbon
cartridge 24 is received on the printer 20 as best shown in
FIGURE 2. An assembly generally indicated at 46 is used to
latch the housing 23 of the cartridge 24 and mounting section
40 to the housing 21 and to guide the carrier web W.
As shown in FIGURE 4, the mounting section 40 mounts the
print head assembly 45. The print head assembly 45 includes a
plate 46 which extends generally horizontally. The plate 46
has an upturned curved plate portion 47 (FIGURES 2, 3 and 4)
which terminates at a downwardly extending knife-shaped edge
48 (FIGURES 3 and 4).
CA 02447278 2003-11-20
A depending guide 49 having an inverted U-shaped guide
surface 50 is connected to each end of the plate 46. An ink
ribbon guide 51 is mounted to the plate portion 47. When
correctly adjusted the guide 51 causes the ink ribbon IR to
track correctly. The plate portion 47 has a depending stud
52 which is received in a hole 53 in the guide 51. The
guide 51 has an integrally formed plate 54. The guide 51
also has an L-shaped bracket 55 which is located above the
upper surface of the plate 46. An adjusting screw 57 passes
through a slot 58 in the plate portion 47 and is threadably
received in a threaded hole 56 in an upstanding portion 56'
of the bracket 55. The screw 57 extends through a
compression spring 59 which bears against the upstanding
portion 56' of the bracket 56 and against the plate portion
47. The angular position of the ribbon guide 51 relative to
the plate 46 and the print head 37 can be changed by
rotating the screw 57. Rotation of the screw 57 causes the
guide 51 to pivot about the stud 52. The compression spring
59 retains the guide 51 in its adjusted position. A
mounting plate 60 which constitutes a heat sink for the
print head 37 is secured to the underside of the plate 46
between the guides 49. The plate 54 is movably supported by
and against the upper surface of the plate 60. Screws 61
secure the plates 46 and 60 to each other. Compression
springs 62 are received in cup-shaped members 63 in the
shelf 44 and bear against the upper surface of the plate 46.
A tab 64 having an aperture 65 is secured to the plate
portion 46. The tab 64 projects into a cross-shaped recess
66. The recess 66 has a first slot portion 67 which
receives the tab 64 with clearance. The recess 66 also has
a second slot portion 68 which bottoms out as shown in
FIGURE 2 for example. The slot gortions 67 and 68 are
perpendicular to each other . A round pin 6 6 ' passes through
the hole 65 with clearance and rests in the slot portion 68.
6
CA 02447278 2004-06-30
When the printer is in the operating position, the springs 62
are under greater compression than when the print head 37 is
moved away from the platen roll 38. As seen in FIGURES 2 and
4, the shelf 44 has elongate grooves 69. In the position of
FIGURE 2, the knife edge 48 is spaced from parallel grooves
69. When the print head 37 and platen roll 38 are separated,
the springs 62 will urge the print head assembly 45 to a
position at which the knife edge 48 (FIGURE 2) bears against
one of the grooves 69 (FIGURE 4) as shown in FIGURE 3. Thus,
the print head assembly 45 is held in approximately aligned
position relative to the platen roll 38.
The mounting section 40 is shown to have a pair of annular
portions 70 having aligned holes 71. Mounting section 39
(FIGURE 5) also has a pair of annular portions 72 with opposed
studs 73 received in the holes 71. The annular portions 72
also have studs 74 which are received in arcuate slots 75 in
annular portions 70. The studs 74 cooperate with the ends of
the slots 75 to limit the amount of rotation of the mounting
section 40 relative to the mounting section 39.
With reference to FIGURE 5, the mounting section 39 is
shown to include an outer wall 35'. The wall 35' mounts a
pair of latches 76 guided in respective guides 77 and urged in
opposite directions by compression springs 78. The latches 76
are manually movable and accessible through openings 79. The
latches 76 have respective latch teeth 80 received in opposed
pockets 81 (only one of which is shown in FIGURE 2). The wall
35 is secured to the outer wall 35' by screws 82.
With reference to FIGURE 7, the assembly 46 is shown in
exploded form. Member 83 is shown to have a pair of latching
grippers 84. As shown in FIGURES 2 and 8, the gripper 84
grips a surface 85 in the ink ribbon cartridge housing 23.
The member 83 has a pair of spaced depending
7
CA 02447278 2003-11-20
portions 86 which have aligned holes 87. A rod 88 passes
through the holes 87 and through aligned holes 89 in a
member 90. A rod 91 passes through holes 92 in the member
9 0 and through a hole 9 3 in a f fixed member 9 4 . When the
assembly 46 is in the position shown in FIGURES 2 and 8, the
members 83 and 90, which form a toggle linkage, are in an
overcenter or latching condition. As shown for example in
FIGURE 8, the grip member 85 on the cartridge housing 23 is
gripped by the latching gripper 84. The rod 88 overcenter
with respect to a centerline CL to provide a toggle linkage
or mechanism.
As seen in FIGURES 2 and 8, a leaf spring 83' secured
to studs 89' on the member 83 is used to urge the carrier
web W against the platen roll 38. The leaf spring 83'
ensures that there is suf f icient contact between the carrier
web W and the platen roll 38. The leaf spring 83' has a
connector portion 83" with holes 83a. Oversize holes 83b in
the leaf spring 83' allow fasteners 83c to pass freely
therethrough and to be press fitted onto the studs 89'.
As seen in FIGURE 8, a screw 83d is adapted to hold an
optional tear bar (not shown).
With reference to FIGURE 10, a drive mechanism is
generally indicated at 94. The drive mechanism 94 includes
an electric motor 95 for driving a gear 96. The gear 96
meshes with gears 97 and 98. Coaxially secured to the gear
97 is a gear 99 which meshes with a gear 100. The gear 100
has a non-circular hole 100' Which receives a non-circular
end portion 101 of a shaft 102. The platen 38 is comprised
of a sleeve of resilient frictional material on the shaft
102. The shaft 102 is mounted in spaced bearings 103. The
bearings 103 are mounted in bearing housings 103' mounted in
the housing 21.
The gear 98 is secured to an axially aligned gear 104
which meshes with a gear 105. The gear 105 meshes with a
8
CA 02447278 2003-11-20
gear 106. The gear 106 is secured to an axially aligned
tubular clutch member 107. A tubular clutch member 108 has
an end wall 109 with a non-circular hole 110. A wrapped
clutch spring 111 has a first spring portion 112 received by
the outside surface of the clutch member 107 and a second
spring portion 112' received by the inside surface of the
clutch member 108. A shaft 114 having a non-circular end
portion 115 is received in the hole 110 so that the clutch
member 108 and the shaft 114 rotate as a unit. The shaft
114 is secured to a disc 116 with three hook-shaped
connectors 117 which couple to a drive member 118 for
rewinding the ink ribbon IR in the ink ribbon cartridge 24.
The drive member 118 includes a rod 119 telescopically
received in the shaft 114. A spring 120 is also received in
the shaft 114 and pushes on the rod 119. The connectors 117
couple to the drive member 118 and enable the drive member
118 to shift against the force of the spring 120 when the
cartridge is being installed into the printer. When the
motor 95 is operated, the glaten roll 38 is driven and the
drive member 118 is driven through the spring clutch 113
comprised of the clutch members 107 and 108 and the clutch
spring 111. The clutch 113 assures that the proper tension
is applied to the ink ribbon IR so that the ink ribbon is
properly wound up in the cartridge.
The drive mechanism 94 is assembled using a frame
member 121 secured to the housing 21. A bracket 122 and the
frame member 121 rotatably mount motor 95, gears 97 and 99,
98 and 104, and 105, the shaft 114, and one of the bearing
housings 103'.
With reference to FIGURE 11, there are shown housing
sections generally indicated at 130 and 131, the ink ribbon
IR, a tubular core or spool C1 on which the ink ribbon IR is
wound into a roll R1 and a tubular core or spool C2 on which
the used or spent ink ribbon is wound.
9
CA 02447278 2004-06-30
The cartridge housing 23 is comprised of the housing
sections 130 and 131. The housing section 130 has an axially
extending shaft member 132 with a planar end surface 134 and
an axial reduced-diameter end portion or projection 133
extending from the planar surface 134. There is an axial hole
135 in the projection 133. The shaft member 132 extends
outwardly from a wall 136 of the housing section 130. The
housing section 131 has a shaft member 137 projecting from a
wall or plate 138 (FIGURE 15) of the housing section 131. The
shaft member 137 terminates at a surface 139. A recess 140 in
the shaft member 137 receives the projection The housing
sections 130 and 131 can be suitably connected either
permanently as by a permanent adhesive or releasably. A screw
141 is shown to pass through a hole 142 within the shaft
member 137 and to be threadably received in the axial hole 135
in the projection 133. As shown, the shaft members 132 and
137 are hollow.
A brake generally indicated at 143 (FIGURE 13) is shown to
comprise a tubular or sleeve member 144 having a frictional
outer surface 145. The sleeve member 144 has a central hole
145' for receiving the projection 133. The sleeve member 144
is comprised of resilient closed-cell foam material and is
positioned between surfaces 134 and 140. The distance between
the surfaces 134 and 140 in their assembled position is less
than the length of the sleeve member 144 in its unassembled,
unrestrained condition so that the sleeve member 144 is
slightly compressed in the axial direction in the position
shown in FIGURE 13. In that the sleeve member 144 is
compressed, the sleeve member 144 is more dense than it is in
its unrestrained condition prior to assembly. The shaft
members 132 and 137 are stationary and the sleeve member 144
is held stationary on the projection 133. The outer surface
145 of the sleeve 144 is in frictional contact with the inner
surface 146 of the core C1. The core C1 can
CA 02447278 2004-06-30
be composed of either plastic or cardboard. This causes a
braking force or drag to be applied to the core Cl to maintain
tension in the ink ribbon IR. The rotation of the platen roll
38 is sufficient, however, to cause the braking force exerted
by the brake 143 to be overcome so that ink ribbon IR can be
paid out or drawn from the ink ribbon supply roll.
The wall 136 also mounts a drive spindle 147 as best shown
in FIGURE 14. The spindle 146 is rotatably received in an
internally-stepped annular portion 148. An internal flange
149 on the annular portion 148 is received between annular
projections 150 and 151 on the spindle 147. The drive spindle
147 is, thus, held captive in the annular portion 148. A
drive head 152 has a stud 153 which cooperates with any one of
the grooves 118' (FIGURE 10) in the drive member 118. As the
drive member 118 rotates, the drive head 152 is driven via
stud 153 to drive the core C2. The drive spindle 147 has a
drive lug 154 which engages a notch 155 (FIGURE 11) in the
core C2.
The core C2 is supported both on the spindle 147 and on a
shaft member 156. Posts 157 and 158 secured to respective
walls 136 and 138 can be connected by a screw 159 passing
through a hole 160 in the post 158 and threadably received in
the post 157.
As best seen in FIGURE 15, the housing sections 130 and
131 are positioned end-to-end. The upper housing member
generally indicated at 161 is spaced upwardly from lower
housing member 162 by an open space 163. As seen in FIGURE 3,
the cartridge 24 is inserted onto the printer 20 by moving the
cartridge 24 relative to the shelf 44 and the print head
assembly 45 until the cartridge 24 has been slid to the
position shown in FIGURE 2. The housing member 161 is tapered
toward the center CE where the housing section 130 and 131
abut and the two abutting portions 130' and 131'
11
CA 02447278 2004-06-30
which constitute the housing members 161 are flexible and
resilient enough to deflect during assembly onto the printer
20 until arcuate portion 164 enters a recess 165 in the shelf
44. Thus, as the cartridge 24 is slid onto the printer 20 and
the print head assembly 45 and the shelf 44 enter the open
space 163, the arcuate surface 164 finally detents into the
recess 165 to hold the cartridge 24 detented essentially in
its operating position.
It is to be noted that the cartridge housing 23 has slots
166 which permit the guides 49 to clear the cartridge housing
23. Upon such installation of the cartridge 24, the mounting
section 39 can be pivoted on posts 41 counterclockwise as seen
in FIGURE 3, and thereupon the mounting section 40 can be
pivoted counterclockwise about posts 73 (FIGURE 5) until the
guides 49 locate on the bearing housing 103', as seen in
FIGURE 9. This causes th.e print head 37 to be located
precisely relative to the platen roll 38.
Thereupon the assembly 46 can be moved to the generally
vertical position (FIGURE 3) so that the latching gripper 84
can engage the grip member 85 on the cartridge housing 23.
Thereupon the manually engageable member 90 can be pressed
inwardly until the shaft 88 is in the overcenter position with
respect to the centerline CL as shown in FIGURE 8.
When the assembly 46 is latched, the arm portions 44'
which have notches 44a are urged by webs 130c and 131c against
the stop 21a, thus locating the cartridge 24 in its operating
position.
Other embodiments and modifications of this invention will
suggest themselves to those skilled in the art and all such of
these as come within the spirit of this invention are included
within its scope as best defined by the appended claims.
12
