JPS59198183A - Ink ribbon driving mechanism for printer - Google Patents

Abstract

PURPOSE:To provide the titled mechanism composed of a small number of component parts, simple in construction and easy to assemble, wherein a ribbon-feeding mechanism and an interlocking member are fitted to an ink ribbon fitting base, and one end of a crank lever is engaged to the interlocking member when assembling. CONSTITUTION:The ribbon-feeding mechanism 23 and the interlocking member 24 are previously fitted to the ink ribbon fitting base 5, then the base 5 is fitted to left and right frames 1a, 1b, and the crank lever 34 is fitted by engaging it to the interlocking member 24. The interlocking member 24 is guided by a slot 37 provided in the ink ribbon fitting base 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a mechanism for feeding and driving an ink ribbon installed in a printer.

[Technical background of the invention and its problems]

An ink ribbon drive mechanism has been used in the past, in which the ink ribbon attached to the printer is fed by a fixed amount in conjunction with the movement of the carrier, but this type of mechanism requires movement in conjunction with the movement of the carrier. There were problems such as the structure for interlocking was complicated and it was difficult to assemble to the frame.

[Purpose of the invention]

The present invention was made based on these circumstances, and
The purpose is to provide an ink ribbon drive mechanism for a printer that is easy to assemble, has a small number of parts, and has a simple configuration.

[Summary of the invention]

A paper press roller support mechanism for a printer according to the present invention includes left and right frames, a platen attached to both frames, a carrier that is movable parallel to the platen and has a print head mounted so as to face the platen. An ink ribbon mount that connects both frames and supports the ink ribbon spool, a ribbon feed mechanism attached to the ribbon mount, and a ribbon feed mechanism that is connected to the ribbon feed mechanism and moves back and forth to feed the ribbon. a linking member to be operated; one end of the linking member is removably engaged with the linking member; the other end of the linking member is reciprocally guided by the ink ribbon mounting base; It is characterized by comprising a crank lever that reciprocates.

With the above configuration, the ribbon feeding mechanism and the interlocking member are attached to the ink ribbon mounting base in advance, and then,
Since the ink ribbon mount can be attached to the frame and the crank lever can be attached with one end engaging the interlocking member, assembly is easy, and the connection member can be guided by a part of the ink ribbon mount. Therefore, the number of parts can be reduced and the configuration can be simplified. C Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Figure 1 shows the appearance of a printer that prints on rolled receipt paper and journal paper.
are left and right frames, 2 is a paper holder that stores receipt paper and journal paper for supply, 3 is a print head, and 4
5 is a platen, 5 is an ink ribbon mounting base on which ink ribbon spools 6a and 6b are attached, and both spools 68.6
The ink ribbon 6 is wound alternately between times b. Further, 7 is a paper supply guide, and 8 is a rotatably mounted stamp mounting plate.

The paper holder 2 is provided with a winding shaft 9 for winding up the printed journal paper. The platen 4 has a medium paper guide 1 that guides the journal paper to the winding shaft 9.
0 is provided, and a stamp pad 1 is provided on the side of this guide 10.
1 is integrally formed. Further, a stamp 13 that moves forward and backward while being guided by a stamp guide 12 is attached to the stamp mounting plate 8 so as to face the stamp base 11, and a lever 11 connects the stamp 13 and a cutter (not shown).
An electromagnetic plunger 15 is mounted which is driven via 4.

The print head 3 is attached to a carrier 17 which is slidably attached to a carrier guide shaft 16 as shown in FIG. The left and right frames 1a, 1 are integrally connected by the ink ribbon mount 5, carrier guide shaft 16, platen 4, and paper supply guide 7. The ink ribbon mount 5 connects the front ends of the frames 1a and lb. That is, the left and right frames 1a.

1b has four through holes 1 at each front end as shown in Fig. 2.
8 are bored in the front, back, left and right positions, and a pair of through holes 19 are bored in each of the left and right legs of the ink ribbon mount 5. Therefore, when using narrow paper, the through hole 19 of the ink ribbon mount 5 should be replaced with the through hole 19 on the outside of each frame 1a, lb.
Also, when using wide paper, open the inner through hole 1.
8, both are screwed from above.

5- The carrier guide shaft 16 connects the connecting pieces 20 formed at the intermediate portions of the frames 1a and 1b.

That is, the carrier guide shaft 16 has screw holes at both shaft ends. The carrier guide shaft 16 is inserted between the connecting pieces 20 and screwed from the side of the connecting pieces 20, so that the connecting pieces 20 are connected at a predetermined interval. The platen 4 is connected by screwing the bent pieces 21 provided at the rear ends of the frames la and 1b from above.

The ink ribbon spool 6 is attached to the ink ribbon mounting base 5.
a, spool stand 22a for loading 6b.

221) and a ribbon feeding mechanism 23 that selectively drives the spool stands 22a, 22b by a fixed amount. An interlocking member 24 having one end bent into a mouth shape is connected to the ribbon feeding mechanism 23. This interlocking member 24 has a portion curved in the shape of an opening and is rotatably pivoted to the back side of the ink ribbon mount 5, and the U-shaped portion is provided on the side wall of the ink ribbon mount 5. A protrusion 6 is made to protrude outward through the opening.

A carrier drive shaft 25 is attached below the carrier guide shaft 16 for reciprocating the carrier 17 on the carrier guide shaft 16.

This shaft 25 has an endless ring 26 on its outer periphery, and as shown in FIG. 8, a cam follower 26a provided on the carrier 17 is engaged with the ring 26 to rotate in a fixed direction. The carrier 17 is moved back and forth.

Returning to FIG. 1 again, there is a gear 27 on the outer surface of the frame 1b.
．． 28, 29, eccentric gear 30, etc. are arranged.

The gear 27 is attached to the end of the carrier drive shaft 25, and the rotational force of this gear 27 is transferred to the eccentric gear 3.
0 to gears 28, 29. Further, an N magnetic plunger 31 is attached to the outer surface of the frame 1b, and an armature 32 moved by this plunger 31 is normally engaged with an engagement pin 33 protruding from the eccentric gear 30, so that the eccentric gear 30 is connected to the gear. 27 is held at a non-consolidated buy position. The eccentric gear 3o can be brought into mesh with the gear 27 by disengaging the armature 32 from the engagement pin 23 by energizing the plunger 31.

Further, one end of a crank lever 34 is pivotally supported on the gear 28 . As shown in FIGS. 3 to 5, the crank lever 34 has a guide bin 35 and a circular engagement part 36 at the other end, and the guide bin 35 is provided on the side plate of the ink ribbon mount 5. The circular engaging portion 36 is slidably fitted into the elongated hole 37, and the circular engaging portion 36 is fitted into the interlocking member 24.
It is removably fitted inside the U-shaped part. and gear 2
Each rotation of the interlocking member 24, the interlocking member 24 is reciprocated once, and each rotation of the interlocking member 24 causes the ribbon feeding mechanism 23 to rotate either the spool stand 22a or 22b by one pitch, thereby feeding the ink ribbon 6. configured to work. Note that a guide pin 35 is provided at one end of the elongated hole 37.
A large-diameter hole portion 37a is formed as shown in FIG. 5, into which the
A fitting groove 358 into which both edges of the elongated hole 37 are fitted is formed in the guide bin 35 as shown in FIG. 4.

The carrier drive shaft 25 is the left and right frame la.

1b as shown in FIGS. 6 and 7.

That is, each frame 1a, 1b is provided with a fitting recess 38 at a position below the connecting piece 2o so as to open toward the front, and a fitting recess 38 is provided at both ends of the carrier drive shaft 25 to fit into each fitting recess 38. A matching bearing 39 is attached. Further, an engagement recess 40 is formed at the opening edge of each fitting recess 38, and a retaining plate 41 is provided which is engaged with the engagement recess 40 of the left and right frames 1a, 1b. Therefore, the 6th
As shown in the figure, after fitting the bearings 39 at both ends of the carrier drive shaft 25 into the fitting recesses 38 of the left and right frames 1a, 1b from the front, both ends of the handling plate 41 are engaged with the engaging recesses 40 of the left and right frames 1a, 1b. By matching the bearing 39 and preventing it from coming off, the bearing 39 can be installed as shown in FIG. Further, a large-diameter gear 42 is attached to the end of the carrier drive shaft 25 opposite to the gear 27, and this large-diameter gear 42 is configured to be rotationally driven by a motor 43 attached to the inside of one frame 1a. It has become.

9- The ink ribbon mount 5 has a carrier guide 44 bent at a substantially right angle as shown in FIG. 8 at its front edge;
A sliding piece 45 that slides on the carrier guide 44 is attached to the lower end of the carrier 17. Therefore, the carrier 17 is guided by the carrier guide shaft 16 and the carrier guide 44, and reciprocates as the carrier drive shaft 25 rotates.

The paper supply guide 7 is for feeding the receipt paper and journal paper pulled out from the paper holder 2 between the platen 4 and the print head 3, and is provided on the lower guide plate 46 as shown in FIGS. 9 to 11. It is constructed by stacking upper guide plates 47 from above. These guide plates 46.4
7 are both made of synthetic resin and have a flat surface that is concave toward the top, and a gap is formed between both guide plates 46 and 47 that is large enough to allow paper to pass through, and the lower guide plate Partition walls 48 are formed on both sides and in the middle of the upper surface of the partition wall 46 . The intermediate partition wall 48 separates the receipt paper insertion path from the journal paper insertion path. The lower guide plate 48 is screwed to the left and right frames 1a and 1b. In addition, 49 in the figure is a wear prevention body made of a metal plate, and this has three arm parts 50, and these arm parts 50 are attached to the lower guide plate 46.
It is inserted from behind and positioned on the upper surface of each partition wall 48.

In the figure, reference numeral 51 denotes a guide plate made of a thin metal plate, which is attached by being inserted into the front end of the lower guide plate 46, and allows the paper that has passed between the lower guide 46 and the upper guide 47 to pass between the platen 4 and the print head. 3.

In the figure, reference numeral 52 denotes a pair of paper feed rollers, and roller shaft bearings 54 are attached to both ends of the roller shaft 53 of each roller 52. The roller shaft 53 is arranged on the upper surface side of the upper guide plate 47, and each paper feed roller 52 is introduced into the cash register 1 paper insertion path and the journal paper insertion path through an opening provided in the upper guide plate 47. . Also, each bearing 5
4 has a convex portion 55 as shown in FIGS. 10 and 11, and a part of the partition wall 48 of the lower guide plate 46 is connected to the upper guide plate 46.
The protrusion 55 protrudes from above through an opening provided in the protrusion, and is fitted into a recess 56 formed in the protrusion from above, as shown in FIG. Each bearing 54 is pressed from above by the lower end surface of the platen 4, and furthermore, the lower guide plate 46 is pressed by the bearing 54 from above.

The upper guide plate 47 is also held down by the platen 4 as shown in FIG. 11, and the assembly of the paper guide 7 can be completed by attaching the platen 4 to the frames 1a and 1b. A ratchet gear 57 is attached to each outer end of the roller shaft 53, and each ratchet gear 57 is rotated by one pitch each time the electromagnetic plunger 31 is energized by a ratchet pawl 58 pivotally supported by the armature 32. It is configured to

As shown in FIG. 1, a pulley 59 is coaxially provided on the gear 29, and this pulley 59 and a pulley 6° attached to the side wall of the paper holder 2 are interlocked via a belt 61. ing. Note that a gear (not shown) coaxial with the pulley 60 is disposed inside the paper holder 2, and this gear has a gear 6 attached to the winding shaft 9.
2 are interlocked. Therefore, each time the electromagnetic plunger 31 is energized and the gear 29 rotates under the rotational force of the carrier drive shaft 25, the winding shaft 9 rotates by a certain amount.

FIGS. 12 and 13 show the attached state of the pinch roller 63, which presses against the paper feed roller 52 from below. In the figure, reference numeral 64 denotes a pinch roller mounting member having a curved cross-sectional shape, and this mounting member 64 has V-shaped image fitting portions 65 at both ends, respectively. In addition, the left and right frames la,
lb is provided with a square hole 66 into which both ends of the mounting member 64 are inserted, and at the lower edge of the square hole 66, a V-shaped notch is formed at a portion corresponding to each of the V-shaped retaining portions 65. As shown in FIG.
Due to the engagement with the left and right frames ia, 1, the mounting member 64
b is rotatably supported. In addition, the mounting member 6
An operating piece 68 for manual operation is formed upward at one end of the 4, and a set of two locking pieces 69 is formed on the other side where the V-shaped image joining part 65 is not formed. is cut and formed.

Furthermore, an engagement hole 70 located between each set of locking pieces 69 and a set of two stopper protrusions 71 are provided. A pinch roller support plate 72 made of an elastic plate is inserted between each set of locking pieces 69 for installation. Each pinch roller support plate 72 is formed with an engaging piece 73 cut and raised from the lower surface side in the center, and this engaging piece 73 is engaged in the engaging hole 70, and one end is formed by two pieces. It is attached to the attachment member 64 in contact with the stopper protrusion 71 . Further, one support piece 74 extends in parallel from the other end of the pinch roller support plate 72, and both support pieces 74 are configured to support the shaft end of the pinch roller 63 from below. The pinch roller mounting member 64 is urged by two tension springs 75 to rotate in a direction that brings the pinch roller 63 into pressure contact with the paper feed roller 52.

FIG. 14 shows the state in which the stamp mounting plate 8 is attached to the ink ribbon mounting base 5.

14- That is, the stamp mounting plate 8 has left and right pivot pieces 76, and each pivot piece 76 is rotatably supported on the front end portions of the left and right frames 1a, 1. Furthermore, engagement recesses 77 are formed on the left and right sides of the tip of the stamp mounting plate 8. This engagement recess 77 is formed by forming a shallower V-shaped recess on the bottom surface of a U-shaped recess. On the other hand, the left and right frames
a.

1b, at the upper end of each of the connecting pieces 20, as shown in FIG.
, (El), each connecting piece 20 has a positioning protrusion 78 that engages with the engaging recess 77, and locking members 79a and 79b made of synthetic resin are screwed onto the outer surface of each connecting piece 20. Each of the locking members 79a and 79b has an ink ribbon guide 80 on which the ink ribbon 6 is wrapped.
They are integrally formed as shown in FIGS. 15(a) and 15(b).

One of the locking members 79a extends upwardly, and the engagement recess 7
A locking stepped portion 81 is provided near the stamp mounting plate 7 from above and reliably inhibits upward rotation of the stamp mounting plate 8. The other locking member 79b is also provided with a locking step 82 near the engagement recess 77 that is hooked from above.
This stepped portion 82 is an inclined surface, and the stamp mounting plate 8
It does not have sufficient retention function for Then, when the upper end of one of the engaging members 79a is opened outward and the locking stepped portion 81 is removed from the stamp mounting plate 8, the holding function for the stamp mounting plate 8 is insufficient with the other locking member 79b alone. ,
The stamp mounting plate 8 can be opened upward. That is, the stamp mounting plate 8 can be easily opened by simply removing one of the locking members 79a.

Next, the operation will be explained.

When rolled receipt paper and journal paper are stored in the paper holder 2 and the leading edge of each paper is inserted between the paper feed roller 52 and the pinch roller 63 and the motor 43 is driven, the carrier drive shaft 25 rotates. Also, the electromagnetic plunger 31 is energized, and the armature 32 is connected to the engagement pin 33.
When released, the eccentric gear 30 meshes with the gear 27 attached to the carrier drive shaft 25, thereby transmitting the rotational force of the carrier drive shaft 25 to the gears 28, 29.

When the electromagnetic plunger 31 is intermittently energized, the ratchet pawl 58 pivoted on the armature 32 feeds the ratchet gear 57 one pitch at a time, thereby allowing the receipt paper and journal paper to pass through the paper supply guide 7 and onto the platen 4. It is sent between the print head 3 and the print head 3. At this time, the guide plate 51 comes to regulate the traveling direction of the paper. The electromagnetic plunger 31, the armature 32, and the ratchet pawl 58 are provided separately on the outer surfaces of the left and right frames 1a and 1b, making it possible to feed receipt paper and journal paper independently.

When the paper is located between the platen 4 and the print head 3, printing can be performed by driving the print head 3. However, for journal paper, the leading edge of the paper must first be fixed to the take-up shaft 9. By doing so, the windings can be wound around the winding shaft 9 one after another. Regarding receipt paper, each time a single receipt is issued, the electromagnetic plunger 15 is energized, and the cutter operates to separate the paper at an appropriate position.At the same time, the stamp operates 17- to cut the paper at the beginning of the next receipt. Stamp printing will be performed.

Moreover, each time the electromagnetic plunger 31 is energized, the gear 28 is
The ink ribbon 6 rotates, the ribbon feeding mechanism 23 operates, and the ink ribbon 6 is wound one pitch at a time onto one of the ink ribbon spools (for example, 6a). When the ink ribbon 6 is wound up to the end, the ribbon feed mechanism 23 is switched due to the tension, and the other ink ribbon spool (for example, 6b
) is the winding side.

According to the ink ribbon drive mechanism of the printer configured as described above, the ribbon feeding mechanism 23 and the interlocking member 24 are attached to the ink ribbon mount 5 in advance, and then the ink ribbon mount 5 is moved to the left and right frames 1a, 1b, and the crank lever 34 can be attached by engaging the interlocking member 24 at one end, making assembly easy.
7 guides the interlocking member 24, the number of parts can be reduced and the configuration can be simplified.

[Effect beam of invention]

As described above based on the embodiments, according to the present invention, it is possible to provide an ink ribbon drive mechanism for a printer that is easy to assemble, has a small number of parts, and has a simple configuration.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is an external perspective view of the printer, Fig. 2 is an exploded perspective view of the main parts of the printer, and Fig. 3 is a perspective view showing the peripheral part of the ribbon feeding mechanism. , Fig. 4 is a partial cross-sectional view showing the crank lever, Fig. 5 is a side view showing the connecting part between the crank lever and the interlocking part, Fig. 6 is an exploded perspective view of the area around the carrier drive shaft, and Fig. 7 is the same. FIG. 8 is a partial sectional view of the surrounding area of the carrier, FIG. 9 is an exploded perspective view of the surrounding area of the paper supply guide, and FIG. 10 is an exploded side view showing a part of the same section in cross section. Fig. 11 is an assembled side view of the same part, Fig. 12 is an exploded perspective view of the paper pressing roller support mechanism, Fig. 13 is a side view of the same part, Fig. 14 is a perspective view showing the surrounding area of the stamp mounting plate, Figures 15a and 15b are perspective views showing the left and right locking members, and Figures 16a and 16b are perspective views showing the relationship between the left and right locking members and the stamp mounting plate.
1a, 1b...Frame, 3...Print head, 4.
...Platen, 5...Ink ribbon mounting stand, 6a,
6b... Ink ribbon spool, 17... Carrier, 23... Ribbon feeding mechanism, 24... Interlocking member, 3
4...Crank lever. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A left and right frame, a platen attached to both frames, a carrier that is movable parallel to the platen and has a print head mounted opposite to the platen, and a carrier that connects the two frames and supports an ink ribbon spool. An ink ribbon mount, a ribbon feed mechanism mounted on the ink ribbon mount, an interlocking member that is connected to the ribbon feed mechanism and reciprocates to cause the ribbon feed mechanism to feed the ribbon, and one end of the link member. and a crank lever that reciprocally engages with the ink ribbon mount and is reciprocally guided by the ink ribbon mount, the other end of which moves circularly in conjunction with the reciprocating movement of the carrier, thereby reciprocating the connecting member. An ink ribbon drive mechanism for printers featuring: