JPS59198173A - Paper-feeding mechanism for printer - Google Patents

Abstract

PURPOSE:To prevent a partition wall from being abraded due to sliding contact thereof with a printing paper, by providing an abrasion-preventing body consisting of a metallic plate in proximity to a guide plate made of a synthetic resin. CONSTITUTION:The leading end of a receipt paper or the like is inserted between a 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 paper is fed between a platen 4 and a printing head 3 through a guide 7. Then, the head 3 is driven to print. In this case, the partition wall 48 can be prevented from being abraded, by the abrasion-preventing body 49 consisting of a metallic plate which is inserted to an upper surface part of the partition wall 48 from the back side of a lower guide plate 46 and is brought into sliding contact with both side edges of a printing paper, and the lower guide plate 46 can be reinforced by the body 49.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a paper feeding mechanism for a printer.

[Technical background of the invention and its problems]

In a printer in which the left and right frames are connected by a rendaku member and a print head is installed between them, it is possible to use a platen, carrier guide shaft, paper supply guide, etc. as the connecting member without using any special connecting member. ,
It is possible to simplify the configuration.

On the other hand, in order to prevent the print paper from meandering and smoothly guide the paper to a position in front of the print head, it is desirable to provide the paper supply guide with a partition wall that restricts the movement of the paper in the paper width direction. By the way, it is effective to make a paper supply guide with such a partition wall from synthetic resin in order to reduce costs, but if it is made from synthetic resin, both edges of the printing paper will always be in sliding contact with the partition wall. However, there is a problem in that the sliding surface wears out. Moreover, in order to provide the function as a connecting member that connects the left and right frames, there is also a problem in terms of strength.

[Purpose of the invention]

The present invention was made based on these circumstances, and
The object is to provide a paper feeding mechanism for a printer that can prevent abrasion due to sliding contact of printing paper in a paper feeding guide made of synthetic resin, and can improve the strength of the paper feeding guide.

[Summary of the invention]

The paper press roller support mechanism for a printer according to the present invention includes left and right frames, a lower guide plate made of synthetic resin that connects the two frames and has a partition wall on the upper surface for regulating the movement of the printing paper in the width direction of the paper. an upper guide plate that is arranged on the upper surface side of the lower guide plate and forms an insertion path for the print paper between the lower guide plate and guides the print paper to a position in front of the print head;
The present invention is characterized by comprising a wear prevention body made of a metal plate that is inserted into the upper surface of the partition wall from the back side of the lower guide plate and makes sliding contact with both side edges of the printing paper.

With the above configuration, the wear prevention body can prevent wear of the partition wall, and can also reinforce the lower guide plate.

[Embodiments of the invention]

Hereinafter, one 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 with ink ribbon spools 6a and 6b attached, and both spools 6a
, 6b, the ink ribbon 6 is wound alternately. 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 ready-made 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 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 1a and 1b. 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 holes 19 of the ink ribbon mount 5 should be replaced with the through holes 19 on the outside of each frame ia and 1b.
Also, when using wide paper, open the inner through hole 1.
8, both are screwed from above.

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 five connecting pieces 20 and screwed from the side of the connecting piece 2o, so that the connecting pieces 2o 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 1a 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.

22b and the spool stands 22a, 22b are selectively driven by a constant 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. 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.
It is sequentially transmitted to gear wheels 28, 29 via Further, an electromagnetic plunger 31 is attached to the outer surface of the frame 1b, and the armature 32, which is normally driven by the plunger 31, is engaged with an engagement pin 33 protruding from the eccentric gear 3o, and the eccentric gear 30 is activated. It is held in a non-engaging position with respect to the gear 27. 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. It is slidably fitted into the elongated hole 37, and the circular engaging portion 36 is fitted into the mouth-shaped connecting portion 24 of the ribbon feeding mechanism 23. Then, each time the gear 28 rotates once, the connecting portion 24 is reciprocated once,
The ribbon feeding mechanism 23 is configured to rotate either the spool stand 22a or 22b by one pitch each time the connecting portion 24 rotates, thereby feeding the ink ribbon 6. Note that a guide bin 35 is provided at one end of the elongated hole 37.
But nl! A possible large diameter hole 37a is formed as shown in FIG. 5, and a fitting groove 35a into which both edges of the elongated hole 37 are fitted is formed in the guide bin 35 as shown in FIG.

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

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 connection piece 20 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, ib. 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 retaining 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.

The ink ribbon mount 5 has a carrier guide 44 bent at a substantially right angle at its front edge as shown in FIG.
This carrier guide 714 is located at the lower end of the carrier 17.
The ochiai piece 45 that slides on is the attachment. 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.

9- The paper supply guide 7 is for feeding receipt paper and journal paper pulled out from the paper holder 2 between the platen 4 and the print head 3, and as shown in FIGS. 9 to 11, a lower guide plate is provided. 46 and an upper guide plate 47 overlaid 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 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 . Partition in the middle! Reference numeral 48 separates the receipt paper insertion path from the journal paper insertion path. The lower guide plate 48 is attached to the left and right frames l.
a, It is screwed to 1t+. In the figure, reference numeral 49 denotes an abrasion prevention body made of a metal plate, which has three arms 50, which are inserted from behind the lower guide plate 46 and attached to the top surface of each partition wall 48. I'm trying to position it.

Reference numeral 51 in the figure 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 guides the paper that has passed between the lower guide 46 and the upper guide 47 to 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 attached to both ends of the roller shaft 53 of each roller 52. The roller shaft 53 is disposed on the upper surface side of the upper guide plate 47, and 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 convex portion 55 as shown in FIGS. 10 and 11, and the lower guide plate 4
A part of the partition wall 48 of No. 6 protrudes to the upper side through an opening provided in the upper guide plate 46, and the protrusion 55 is fitted into the recess 56 formed in this protrusion from above as shown in FIG. I'm letting you do it. 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 of the outer ends of the roller shaft 53, and each ratchet gear 57 has a ratchet pawl 58 pivotally supported by the armature 32.
The electromagnetic plunger 31 is configured to rotate by one pitch each time the electromagnetic plunger 31 is energized.

As shown in FIG. 1, a pulley 59 is coaxially provided on the gear 29, and this pulley 59 and a pulley 60 attached to the side wall of the paper holder 2 are interlocked via a belt 61. There is. 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 1a,
ib 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 image matching portions 65. As shown in FIG.
By engaging with the mounting members 64, the left and right frames 1a, 1
b is rotatably supported. In addition, the mounting member 6
An operating piece 68 for manual operation is formed upward at one end of 4, and a set of two locking pieces 69 are cut out on the other side where the ■-shaped image joining part 65 is not formed. and is 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 downward at the center, and this engaging piece 73 is engaged in the engaging hole 70, and one end is 2
It is attached to the mounting member 64 in contact with the stopper protrusions 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
Two tension springs 75 bias the pinch row 563 to rotate in a direction that brings it 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.

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 la and 1b. 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 has a shallower V on the bottom surface of the recess cut out in the shape of a mouth.
It is formed by forming a shaped recess. On the other hand, the left and right frames la.

1b has a positioning protrusion 78 at the upper end of each of the connecting pieces 20 that engages with the engaging recess 77 as shown in FIGS. Locking members 79a and 79b made of synthetic resin are screwed. Each locking member 79a, 79b has a front 2
An ink ribbon guide 80 on which the ink ribbon 6 is wrapped is 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 a rolled receipt paper and a 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 row 563 to drive the motor 943, 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 tooth 1130 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, lb, 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 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 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 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 tension causes the ribbon feeding mechanism 23 to switch, and one of the ink ribbon spools (for example, 6b) becomes the winding side.

According to the paper feeding mechanism of the printer configured as described above, the friction preventive body 49 can prevent wear of the partition wall 48, and can also reinforce the lower guide plate 46.

(Effects of the Invention) As described above based on the embodiments, according to the present invention, it is possible to prevent abrasion due to sliding of printing paper in a paper supply guide made of synthetic resin, and to improve the strength of the printer. A paper feeding mechanism can be provided.

[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 sectional view showing the crank lever, and FIG. 5 is a side view showing the connecting portion 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 portion 18-, and FIG. 8 is a partial sectional view of the area around the carrier.
Fig. 9 is an exploded perspective view of the surrounding area of the paper supply guide, Fig. 10 is an exploded side view showing a part of the same part in cross section, Fig. 11 is an assembled side view of the same part, and Fig. 12 is the paper presser roller. An exploded perspective view of the 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, and FIG. 15(a).
(bl is a perspective view showing the left and right locking members, FIG. 16(a)
) and (b) are perspective views showing the relationship between the left and right locking members and the stamp mounting plate. 1a, 1b...Frame, 3...Print head, 7.
...Paper supply guide, 46...Lower guide plate, 47...
- Upper guide plate, 4... partition wall, 49... wear prevention body. Applicant's agent Patent attorney Takehiko Suzue 19-

Claims (1)

[Claims] a left and right frame, a lower guide plate made of synthetic resin that has a partition wall on the upper surface for regulating the movement of the printing paper in the paper width direction and connects the two frames, and a lower guide plate disposed on the upper surface side of the lower guide plate. An upper guide plate that forms an insertion path for the print paper between them and guides the print paper to the front position of the print head; A paper feed mechanism for a printer, characterized in that it is equipped with a wear prevention body made of a metal plate whose edges are brought into sliding contact.