JPS59198171A - Supporting mechanism for paper press roller in printer - Google Patents

Abstract

PURPOSE:To facilitate assembling process and reduce the number of component parts, by providing a spring with both the function of supporting a fitting member with respect to a frame and the function of pressing a paper press roller against a paper-feeding roller. CONSTITUTION:The leading end of a receipt paper or the like is inserted between the paper-feeding roller 52 and a pinch roller 63, and a carrier-driving shaft is rotated. An electric current is passed to a solenoid plunger 31, and the rotating force of the driving shaft is transmitted to gears 28, 29. The passage of the electric current to the plunger 31 is intermittently effected, and the gear is fed by a pawl 58 by one pitch at a time, whereby the paper is fed between a platen 4 and a printing head 3. In this case, a tension spring 75 is provided with both the function of supporting the fitting member 64 for the pinch roller 63 with respect to left and right frames 1a, 1b and the function of pressing the paper press roller 63 against the paper-feeding roller 52.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a mechanism for supporting a paper presser roller of a printer.

[Technical background of the invention and its problems]

The printer has a paper feed device in which a paper press roller (pinch roller) is pressed against the paper feed roller by a spring force, and the paper inserted between the two rollers is fed by the rotation of the paper roller. It has been used conventionally.

Incidentally, it is desired that the pinch roller be detachably attached to the frame to facilitate assembly and to reduce the number of parts as much as possible.

(Object of the invention) The present invention was made based on the above circumstances, and
The purpose is to provide a paper press roller support mechanism for a 4R printer that is easy to assemble, has a small number of parts, and has a structure.

[Summary of the invention]

The paper press roller support mechanism of the printer according to the present invention includes left and right frames, an opening provided in opposing parts of each frame, a support part provided in a part of the frontage part, and a removable attachment to each support part. A handle (=j member) having an engaging portion that freely engages and is rotatably supported between both frames, and a paper pressing roller supported by this member via an elastic support plate. , the mounting member is rotationally biased in one direction to press the paper press roller into contact with the paper feed roller installed between the two frames, and maintains the engagement state between the engagement portion and the support portion; The device is characterized in that it is equipped with a spring.

With the above configuration, the spring has the function of holding the mounting member against the frame, and the paper pressing roller (bindge roller)
This also has the function of bringing the mounting member into pressure contact with the paper feed roller, and also eliminates the need for a shaft member for rotatably supporting the mounting member, simplifying the structure.

Further, since the mounting member is detachable from the frame and is held to the frame by a spring, assembly is extremely easy.

[Embodiments of the invention] An embodiment of the present invention will be described below 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 for storing paper and journal paper into the supply register 1, 3 is a print head,
4 is a platen, 5 is an ink ribbon mounting base on which ink ribbon spools 6a and 6b are attached, and both spools 6a
, 6b, the ink ribbon 60 is wound around the ink ribbon. Further, 7 is a paper supply guide, and 8 is a rotatably mounted stamp mounting plate.

The paper boulder 2 is provided with a winding shaft 9 for winding up the printed journal paper. Jar on platen 4,
A ready paper guide 10 is provided to guide the full paper to the winding shaft 9, and a stamp stand 11 is integrally formed on the side of this guide 10. 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 the stamp 13 and a cutter (not shown) are connected via a lever 14. An electromagnetic plunger 15 is attached which is driven by.

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 and 1b include the ink ribbon mounting base 5, the carrier guide shaft 16,
The platen 4 and paper supply guide 7 are integrally connected. The ink ribbon mount 5 connects the front end sections of the frames la and 1b. That is, the left and right frames la.

1b has four through holes 1 at each front end as shown in Fig. 2.
A pair of through holes 19 are formed in each of the left and right legs of the ink ribbon mount 5. Therefore, when using narrow paper, the through holes 19 of the ink ribbon mounting base 5 should be replaced with the through holes 19 on the outside of each frame la and 1h.
Also, when using wide paper, open the inner through hole 1.
8, both screws are tightened one turn from above.

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

That is, the carrier guide shaft 16 has screw holes at both shaft ends. Then, this carrier guide shaft 16 is inserted between the two connecting pieces 20 and screwed from the side of the connecting piece 20, so that the two connecting pieces 20 are connected at a predetermined interval. . Platen 4 is frame la
, ib are connected by screwing from above.

The ink ribbon taker 5 includes a spool stand 22a for loading ink ribbon spools 6a and 6b.

22h and this spool stand 22. A ribbon feeding mechanism 23 is provided for selectively driving the ribbons a and 22b by a fixed amount. The ribbon feeding mechanism 23 is curved into a mouth shape, has a connecting portion 24, and projects outward from the ink ribbon mounting base 5.

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

This shaft 25 has an endless spiral groove 26 on its outer periphery, and as shown in FIG. 8, a cam follower 26a provided on the carrier 17 is engaged in this spiral groove 26 to rotate in a fixed direction. This makes the carrier 17 move back and forth.

-〇- Returning to Fig. 1 again, there is a gear 27 on the outer surface of the frame 1b.
, 28, 29, an 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 electromagnetic plunger 31 is attached to the outer surface of the frame 1b, and the Amadei 1-732, which is normally moved by the plunger 31, is connected to an engaging pin 3 protruding from the eccentric gear 30.
3 to hold the eccentric gear 30 in a non-engaging position with respect to the gear 27. The eccentric gear 30 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. It is slidably fitted into the elongated hole 37, and the circular engaging part 36 is fitted into the middle connecting part 2'l of the ribbon feeder 4M23.

Then, each rotation of the gear 28 causes the connecting portion 24 to reciprocate once, and each rotation of the connecting portion 24 causes the ribbon feeding mechanism 23 to rotate either the spool stand 22i'l or 2211 by one bit. It is configured to avoid feeding the ink ribbon 6. A large diameter hole 37a is formed at one end of the elongated hole 37, as shown in FIG. 5, into which a guide bin 35 can be inserted and removed. A matching groove 35a is formed as shown in FIG.

The carrier drive shaft 25 is the left and right frame 1a.

1h as shown in FIGS. 6 and 7.

That is, each frame 1a, 1b is provided with a fitting recess 38 in the lower circle of the connecting piece 20 so as to open toward the front, and each fitting recess 38 is provided at both ends of the carrier drive shaft 25. 1β: The bearing 39 to be matched is attached.

Further, an engagement recess/IO is formed at the opening edge of each fitting recess 38, and the engagement recess 4 of the left and right frames 1a, 1h is formed in the opening edge of each fitting recess 38.
A retaining plate 41 that is locked at 0 is provided. Therefore, 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 as shown in FIG.
The bearing 39 is installed as shown in FIG. 7 by engaging with the engagement recess/IO of h to prevent the bearing 39 from coming off. Also, a large diameter gear 4 is attached to the end of the carrier drive shaft 25 opposite to the gear 27.
2 is attached, and this large-diameter gear 42 is configured to be rotationally driven by a motor 43 attached to the inside of one frame 1a.

The ink ribbon mount 5 has a carrier guide 44 bent at a substantially right angle at its front edge as shown in FIG.
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 to the platen 4 and between the print head 33, and is shown in Figs. As shown, an upper kite plate 47 is stacked on a lower guide plate 46 from above. These kite boards46. Both guide plates 46 and 47 are made of synthetic resin and have a curved shape that curves upward, and a culm gap is formed between both guide plates 46 and 47 through which paper can be inserted. Partition walls 48 are formed on both sides and in the middle of the upper surface of the F section guide plate/I 6. 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 la and lb. In addition, 49 in the figure is a wear prevention body made of metal grade, and this is a wear prevention body made of three arms 5.
0, and these arm portions 50 are inserted from behind the lower guide plate/I6 and placed on the upper surface of each partition wall 48.

In the figure, 51 is a guide plate made of thin metal plate, which is -
Part 1 is installed by inserting it into the front end of the guide plate 46,
This serves to guide the material that has passed between the lower guide 46 and the upper guide 47 to between the platen 4 and the print head 3.

In the figure, reference numeral 52 denotes a pair of paper feed rollers, and bearings 54 are provided at 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,
Each paper feed roller 52 is introduced into the receipt paper insertion path and the journal paper insertion path through an opening provided in the upper guide plate 47. Further, each bearing 54 has a first
As shown in FIG. 0 and FIG. The convex portion 55 is fitted into the four formed portions 56 from above as shown in FIG. 11. Each bearing 54 is pressed from above by the lower end surface of the platen 4, and the lower guide plate 46 is further pressed from above by the bearing 54. 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 0 can be completed by attaching the platen 4 to the frames 1a and 1b. The outer ends of the roller shafts 53 are provided with radials 1 to 57, respectively.
The claw 58 is configured to be rotated one bit at a time when the electromagnetic plunger 17, '31 is energized.

As shown in FIG. 1, a pulley 59 is coaxially disposed on the gear 29, and this pulley 59 and
The pulley 60 installed on the side wall of the bell 1-61
I am trying to link it via . Note that a tooth width (not shown) coaxial with the pulley 60 is disposed inside the paper holder 2, and a gear 62 taken up by the winding 1N19 is meshed with this tooth width. ing. Therefore, the electromagnetic plunger 31 is energized, and the gear 29 is connected to the carrier drive shaft 2.
Each time the winding shaft 9 rotates in response to the rotational force of 5, the winding shaft 9 rotates by a certain amount by 1.

FIGS. 12a3 and 13 show the pinch roller 63 in its first state, which contacts the paper j slip 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. Further, the left and right frames la, 1b are provided with square holes 66 into which both ends of the mounting member 64 are inserted, and a V-shape is formed on the lower edge of the square hole 66 at a portion corresponding to each of the V-shaped image matching portions 65. A support portion with a cutout is provided, and as shown in FIG. 13, by engaging the V-shaped image stand 6G and the support portion 67, the mounting member 64 can freely rotate in the left and right directions. Supported. Also,
An operating piece 68 for manual operation is formed upward at one end of the mounting member 64, and a set of two locking pieces 69 is formed on the other piece 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 two stopper protrusions 71 1#1'1 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 downward at the center, and this engaging piece 73 is engaged in the engaging hole 70, and one end of the -13 The mounting member 64 is brought into contact with the stopper protrusions 71.
It is attached 41 to. In addition, the pinch roller support plate 72
One support piece 74 extends in parallel from the other end, and both support pieces 7/I are configured to support the shaft end of the pinch roller 63 from below. The pinch roller mounting member 6/I is attached to the two tension springs 75, and the pinch roller mounting member 6/I
The roller 63 is rotated in the direction of pressing the paper feed Ll roller 52 into contact with the paper feed Ll roller 52.

Figure 14 shows the ink ribbon removal section of the stamp mounting plate 8.
This figure shows the state of the handle 1 for the stand 5.

That is, the stamp mounting plate 8 has a V-right pivot piece 76, and each pivot piece 76 is rotatably supported on the front end portions of the left and right frames 1a and 1b. Furthermore, an engagement recess 77 is formed on the right and left of the tip of the stamp-receiving plate 8. This engagement recess 77 is formed by forming a shallower V-shaped recess on the bottom surface of a recess that is cut out in the shape of a ]. On the other hand, the left and right frames 1a.

1b, at the child end of each of the connecting pieces 20, there is shown
As shown in (11), each connecting piece 20 has a positioning protrusion 14-78 that engages with the engaging recess 77, and locking members 79a and 79b made of synthetic resin are screwed to the outer surface of each connecting piece 20. Each of the locking members 79a and 79b has an ink ribbon guide 80 to which the ink ribbon 6 is passed for one stroke.
Fig. 15 (, '+1, (bJ) are integrally formed.

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 791 is also provided with a locking step 82 near the engagement recess 77 that is hooked from above. It does not have sufficient retention function. Then, one engaging part (the other engaging member 7 when the upper end of the off 9a is pushed outward and the engaging step part 81 is removed from the stamp removal board 8)
Since this force is insufficient to hold the stamp mounting plate 8, the stamp mounting plate 8 can be moved upward.

In other words, the stamp mounting plate 8 can be opened by using one of the locking members 7.
This can be done easily by simply removing 9a.

Next, explain the operation? J″ru.

Receipt paper and journal paper are stored in the paper holder 2, and when 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 η. Ru. Also, when the electromagnetic 1 unjar 31 is energized and the Amade +7. Yotsu-
The rotational force of the C carrier drive shaft 25 is transmitted to gears 28 and 29.

Then, when the electromagnetic plunger 31 is energized intermittently, the ratchet pawl 58 pivotally supported by the anti-first arm 32 feeds the ratchet gear 57 one pitch at a time, thereby causing the cash register to move. 1 to paper and journal paper are fed between platen 4 and print head 3 through paper supply kite 7. At this time, the guide plate 51 comes to regulate the traveling direction of the paper. In addition, the electromagnetic plunger 31, the armature 32a3
and love tab claws 58 are provided separately on the outer surfaces of the left and right frames 1a, 1b, making it possible to feed receipt paper and journal paper independently.

When the paper is positioned 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 keeping it in place, the winding shaft 9 becomes a winding opening for successive winding. Also, the cash register
For paper 1, each time a receipt is issued, the electromagnetic plunger 15 is energized to operate the cutter and cut the paper at an appropriate position, and at the same time the stamp operates to print a stamp on the starting edge of the next receipt. will be carried out.

Moreover, each time the electromagnetic plunger 31 is energized, the gear 28 is
The ribbon feed mechanism 23 operates to feed the ink ribbon 6 to one of the ink ribbon spools (for example, 6'a').
is wound up one pitch at a time. Then □Ink ribbon 6
When the ink ribbon is wound to the end, the tension causes the ribbon feeding mechanism 23 to switch, and the other ink ribbon spool (for example, 611) becomes the take-up side of the ink ribbon 17.

According to the paper press roller support mechanism of the printer configured as described above, the tension spring 75 has the function of holding the pinch roller take-up 1 member 6/I against the right flaps 1\1a, 1h, and It also has the function of pressing the presser roller (pinch roller 63) against the II (3 slides [1-1-ra 52), and also has a function such as a shaft member that rotatably supports the mounting member 64. No need for anything, very simple
The structure is as follows. In addition, the mounting member 6/l is a frame l\la,
111, and is held on the frames 1a, Ib by springs 75, so assembly is extremely easy.

〔Effect of the invention〕

As described above based on the embodiments, according to the present invention, it is possible to provide a paper presser roller support 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 18-printer, Fig. 2 is an exploded perspective view of the main parts of the printer, and Fig. 3 shows the peripheral part of the ribbon feeding mechanism. A perspective view, FIG. 4 is a partial sectional view showing the crank lever, and FIG.
The figure is a side view showing the connecting part between the crank lever and the ribbon feeding mechanism, FIG. 6 is an exploded perspective view of the area around the carrier drive shaft,
Fig. 7 is an assembled perspective view of the same part, 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 a partial cross-sectional view of the same part. Fig. 11 is an assembled side view of the same part, Fig. 12 is an exploded perspective view of the paper presser roller support mechanism, Fig. 13 is a side view of the same part, and Fig. 14 shows the surrounding area of the stamp mounting plate. Perspective view shown, 1st
5(a) and (b) are perspective views showing the left and right locking members, and FIGS. 16(a) and 16(b) are perspective views showing the relationship between the left and right locking members and the four stamp-taking plates. 1a, Ib...Frame, 52...Paper feed roller,
63...Pinch roller (paper press roller), 64...
Pinch roller mounting member, 65... V-shaped image joint, 66.
...Square hole, 72...Pinch roller support plate, 75...
Tension spring, 77...engaging recess. 19- Kazuo Wakasugi, Commissioner of the Japan Patent Office1. Indication of the case Japanese Patent Application No. 58-72399 2, Name of the invention Printer's paper press roller support mechanism 3, Person making the amendment Relationship to the case Patent applicant (356) Tokyo Electric Co., Ltd. 4, Agent 6 Subject of the amendment Column for title of invention in application, full text of specification 7, contents of amendment (1) The title of invention in application is corrected as shown in the attached sheet. (2) II of the specification? (no change in content). Procedural amendment document July 1982 298 1, Indication of the case Patent application No. 1987-072399 2, Name of the invention Printer paper presser roller support mechanism 3, Person making the amendment Relationship to the case Patent applicant (356) Tokyo Denki Co., Ltd. 4, Agent, 1-26-5 Toranomon, Minato-ku, Tokyo No. 17 Mori Building Specification 7, Contents of amendment The scope of the claims is amended as shown in the attached sheet. 2. Claims Left and right frames, an opening provided in opposing parts of each frame, a support part provided in a part of this opening, and an engaging part that removably engages with each support part. a mounting member rotatably supported between both frames; a paper pressing roller supported by the mounting member via an elastic support plate;
a spring that rotationally urges the mounting member in one direction to press the paper press roller against the paper feed roller installed between the two frames and maintains the engaged state between the engagement portion and the support portion; A paper presser roller support mechanism for a printer comprising: Applicant Attorney Patent Attorney Takehiko Suzue

Claims (1)

[Claims] Both frames have left and right frames, an opening provided in opposing parts of each frame, a support part provided in a part of this opening, and an engaging part that removably engages with each support part. a mounting member rotatably supported therebetween; a paper pressing roller supported by the mounting member via an elastic support plate;
a spring that rotationally biases the mounting member in one direction to press the paper press roller against the paper feed roller installed between the two frames and maintains the engaged state between the engagement portion and the support portion; A paper presser roller support device for a printer, comprising: