JPH0233307B2 - PURINTANOKAMIOKURIKIKO - Google Patents

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 that guides printing paper between a platen and a print head by sandwiching the print paper between a paper feed roller and a paper press roller, the paper feed roller, paper press roller, and paper supply guide are If the positional relationship is not kept constant,
There is a risk that the paper feed amount may fluctuate or meandering may occur. In addition, in this type of printer, the paper feed roller is generally installed by installing roller shaft bearings between the left and right frames and passing the roller shaft between the left and right bearings, but the roller shaft becomes long and it is difficult to assemble. There are some difficult issues.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and its purpose is to facilitate assembly, to easily determine the positional relationship of the paper feed roller, paper press roller, and paper supply guide with high precision, and to have a structure that is easy to assemble. The purpose of the present invention is to provide a simple printer paper feeding mechanism.

[Summary of the invention]

A paper feed roller support mechanism for a printer according to the present invention includes a platen, a printing head disposed opposite to the platen, and a paper supply guide having a partition wall for inserting printing paper and regulating movement in the width direction of the paper. , a roller shaft bearing pressed and fixed to the partition wall by the platen, a paper feed roller rotatably supported by the roller shaft bearing, and a printing paper inserted through the paper supply guide, which is sandwiched together with the paper feed roller. The apparatus is characterized by comprising a paper holding roller that guides the paper between the platen and the printing head by rotation of the paper feed roller.

With the above configuration, the roller shaft bearing of the paper feed roller is pressed and fixed against the partition wall of the paper supply guide by the platen, and a paper presser is applied to the paper feed roller to sandwich the printing paper between both rollers. Therefore, the positional relationship between the paper feed roller and the paper supply guide is maintained constant, and assembly is also facilitated. Furthermore, since the roller shaft bearing of the paper feed roller is pressed against the partition wall, there is no need for a long roller shaft that spans between the left and right frames.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

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

A winding shaft 9 is provided on the paper holder 2 for winding up the journal paper after printing. Platen 4
is provided with a printed paper guide 10 that guides the journal paper to the winding shaft 9, and this guide 1
A stamp stand 11 is integrally formed on the side of 0. Also, the stamp mounting plate 8 has a stamp guide 1.
Stamp 13 moves forward and backward guided by 2.
An electromagnetic plunger 15 is mounted opposite the stamp stand 11 and drives the stamp 13 and cutter (not shown) via a lever 14.

The printing head 3 is attached to a carrier 17 which is slidably mounted on a carrier guide shaft 16 as shown in FIG. The left and right frames 1a, 1b are connected to the ink ribbon mounting base 5.
, the carrier guide shaft 16 , the platen 4 , and the paper supply guide 7 are integrally connected. The ink ribbon mount 5 connects the front ends of the frames 1a and 1b. That is, left and right frame 1
At the front end of each of a and 1b, there are 4
The through holes 18 are arranged in the front, back, left and right.
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 hole 19 of the ink ribbon mount 5 should be replaced with the through hole 18 on the outside of each frame 1a, 1b.
When using wide paper, both are screwed from above in alignment with the inner through-holes 18. The carrier guide shaft 16 is attached to frames 1a and 1b.
The connecting pieces 20 formed in the middle part of the connecting pieces 20 are connected to each other. That is, the carrier guide shaft 16 has screw holes at both shaft ends. And 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
The bent pieces 21 provided at the rear ends of the frames 1a and 1b are connected by screwing from above.

The ink ribbon mounting base 5 includes a spool base 22a for loading the ink ribbon spools 6a and 6b,
22b and a ribbon feeding mechanism 23 that selectively drives the spool stands 22a and 22b by a fixed amount. The ribbon feeding mechanism 23 has a connecting portion 24 which is bent into a U-shape, and is made to protrude to the outside of the ink ribbon mounting base 5.

Below the carrier guide shaft 16 is a carrier 1.
A carrier drive shaft 25 for reciprocating the carrier 7 along the carrier guide shaft 16 is attached. This shaft 25 has an endless spiral groove 26 on its outer periphery, and as shown in FIG.
engage the cam follower 26a provided at 7,
The carrier 17 is moved back and forth by rotating in a fixed direction.

Returning to FIG. 1 again, gears 27, 28, 29, an eccentric gear 30, etc. are arranged on the outer surface of the frame 1b. The gear 27 is connected to the carrier drive shaft 2.
The rotational force of this gear 27 is transmitted to the gear 2 through an eccentric gear 30.
8 and 29 in sequence. Further, an electromagnetic plunger 31 is attached to the outer surface of the frame 1b.
Normally, an armature 32 moved by the plunger 31 is engaged with an engagement pin 33 protruding from the eccentric gear 30 to hold the eccentric gear 30 in a non-coupled position with respect to the gear 27. Then, by energizing the plunger 31, the armature 32 is connected to the engagement pin 2.
By removing eccentric gear 30 from gear 2,
7 can be meshed with each other.
Further, one end of a crank lever 34 is pivotally supported on the gear 28. As shown in FIGS. 3 to 5, this crank lever 34 has a guide pin 35 and a circular engagement part 36 at the other end, and the guide pin 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 U-shaped connecting portion 24 of the ribbon feeding mechanism 23. 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 move back and forth once.
is configured to rotate either the spool stand 22a or 22b one pitch at a time to feed the ink ribbon 6. A large diameter hole 37a into which a guide pin 35 can be inserted and removed is formed at one end of the elongated hole 37, as shown in FIG. 3
5a is formed as shown in FIG.

The carrier drive shaft 25 is connected to the left and right frames 1.
a, 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 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. Furthermore, the fitting recess 38
An engagement recess 40 is formed at the edge of the opening.
A retaining plate 41 is provided which is engaged with the engagement recess 40 of the left and right frames 1a, 1b. 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. By engaging with the recess 40 to prevent the bearing 39 from coming off, it is installed as shown in FIG. 7. Also, the gear 2 of the carrier drive shaft 25
A large-diameter gear 42 is attached to the end opposite to 7, 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 mounting base 5 has a carrier guide 44 bent at a substantially right angle as shown in FIG. 45 is installed. Therefore, the clutch 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 receipt paper and journal paper pulled out from the paper holder 2 between the platen 4 and the print head 3.
As shown in FIGS. 9 to 11, the lower guide plate 4
6 and an upper guide plate 47 overlaid from above. These guide plates 46 and 47 are both made of synthetic resin, and are curved upwardly to form a concave shape, and there is a gap between the two guide plates 46 and 47 that is large enough to allow paper to pass through. Partition walls 48 are formed on both sides and in the middle of the upper surface of the lower guide plate 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 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. Further, 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 guides the paper that has passed between the lower guide 46 and the upper guide 47 to the platen 4 and the printing head. 3.

In the figure, 52 is a pair of paper feed rollers, each roller 5
Roller shaft bearings 54 are provided at both ends of the roller shaft 53 of No. 2.
is installed. The roller shaft 53 is arranged on the upper surface side of the upper guide plate 47, and the roller shaft 53 is arranged on the upper surface side of the upper guide plate 47.
2 is introduced into the receipt paper insertion path and the serial paper insertion path through an opening 83 provided in the upper guide plate 47. Further, each bearing 54 has a convex portion 55 as shown in FIGS. 10 and 11,
A part of the partition wall 48 of the lower guide plate 46 protrudes to the upper surface side through an opening provided in the upper guide plate 46, and the convex portion 55 is inserted into the concave portion 56 formed in this protrusion upwardly as shown in FIG. It's a tighter fit. 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. Further, the upper guide plate 47 is also held down by the platen 4 as shown in FIG.
By attaching it to b, the assembly of the paper guide 7 can be completed. The roller shaft 53
A ratchet gear 57 is attached to each outer end of the armature 32, and each ratchet gear 57 has a ratchet pawl 58 pivotally supported on 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, the gear 29 has a pulley 5.
9 are provided coaxially, and this pulley 59 and a pulley 60 attached to the side wall of the paper holder 2 are interlocked via a belt 61. Note that the above-mentioned pulley 6 is installed inside the paper holder 2.
A gear (not shown) coaxial with the winding shaft 9 is disposed, and a gear 62 attached to the winding shaft 9 is meshed with this gear. 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 paper feed roller 5.
2, the pinch roller 63 is attached to the lower guide plate 46 from below through an opening 84 provided in the guide plate 46. In the figure, reference numeral 64 denotes a pinch roller mounting member having an L-shaped cross section, and this mounting member 64 has V-shaped engaging portions 65 at both ends. Further, the left and right frames 1a, 1b are provided with a square hole 66 into which both ends of the mounting member 64 are inserted, and a V-shaped hole is formed on the lower edge of the square hole 66 at a portion corresponding to each of the V-shaped engaging portions 65. A notched support portion 67 is provided, and as shown in FIG.
b is rotatably supported. Further, 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 is formed on the other piece where the V-shaped engagement part 65 is not formed. Piece 69
is cut and formed. Furthermore, each set of locking pieces 6
An engagement hole 70 and a set of two stopper protrusions 71 are provided. A pinch roller support plate 72 made of an elastic plate is inserted and attached between each set of locking pieces 69. 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, a pair of support pieces 74 extend in parallel from the other end of the pinch roller support plate 72, and both support pieces 74
The shaft end of the pinch roller 63 is supported 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.
That is, the stamp mounting plate 8 is attached to the left and right pivot pieces 76.
and each pivot piece 76 is connected to the left and right frames 1a, 1b.
It is rotatably supported at the front end of. Furthermore, engagement recesses 77 are formed on the left and right sides of the tip of the stamp mounting plate 8. The 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 1a, 1
b has a positioning protrusion 78 on the upper end of each connecting piece 20 that engages with the engaging recess 77 as shown in FIGS. Stop members 79a and 79b are screwed. And each locking member 79a, 79b
An ink ribbon guide 80 on which the ink ribbon 6 is wrapped is integrally formed as shown in FIGS. 15a and 15b.

One of the locking members 79a is provided with a locking stepped portion 81 that extends upwardly and is hooked from above in the vicinity of the engagement recess 77 to reliably prohibit upward rotation of the stamp mounting plate 8. ing. The other locking member 79b is also provided with a locking step 82 near the engagement recess 77 that is hooked from above.
is an inclined surface and does not have a sufficient holding function for the stamp mounting plate 8. Then, the upper end of one of the engaging members 79a is opened outward to form the locking stepped portion 81.
When the stamp mounting plate 8 is removed from the stamp mounting plate 8, the stamp mounting plate 8 can be opened upward because the holding function for the stamp mounting plate 8 is insufficient with only the other locking member 79b. 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, when the electromagnetic plunger 31 is energized and the armature 32 is removed from the engagement pin 33,
Eccentric gear 30 meshes with gear 27 attached to carrier drive shaft 25, thereby transmitting the rotational force of carrier drive shaft 25 to gears 28 and 29.
When the electromagnetic plunger 31 is intermittently energized, the ratchet pawl 58, which is pivotally supported by the armature 32, feeds the ratchet gear 57 one pitch at a time.
This causes receipt paper and journal paper to be fed through paper supply guide 7 between platen 4 and 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 separately provided 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 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 to operate the cutter and tear it off 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.

Further, each time the electromagnetic plunger 31 is energized, the gear 28 rotates once, and the ribbon feeding mechanism 23 operates to wind the ink ribbon 6 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 the other ink ribbon spool (for example, 6b) becomes the winding side.

According to the paper feeding mechanism of the printer configured as described above, the paper feeding roller 52 is moved by the platen 4.
The roller shaft bearing 54 of the paper supply guide 7 is connected to the partition wall 4 of the paper supply guide 7.
8 and fix it, and press the paper press roller (pinch roller 63) against the paper feed roller 52 to release both rollers 5.
Since the printing paper is sandwiched between the rollers 2 and 63, the positional relationship between the paper feed roller 52, the paper press roller 63, and the paper supply guide 7 is kept constant. Further, the assembly of the paper supply guide 7 and the paper feed roller 52 is completed by attaching the platen 4, so that the assembly becomes easy. Furthermore, the roller shaft 53 does not need to be long enough to span between the left and right frames 1a and 1b.

〔Effect of the invention〕

As described above based on the embodiments, according to the present invention, the printer is easy to assemble, allows the positional relationship of the paper feed roller, paper presser roller, and paper supply guide to be determined with high precision, and has a simple configuration. paper feeding mechanism.

[Brief explanation of drawings]

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 connection between the crank lever and the ribbon feeding mechanism, FIG. 6 is an exploded perspective view of the area around the carrier drive shaft, and FIG. 7 is a partial sectional view showing the crank lever. Figure 8 is an assembled perspective view of the same part, Figure 8 is a partial sectional view of the area around the carrier, Figure 9 is an exploded perspective view of the area around the paper supply guide, and Figure 10 is an exploded side view showing a part of the same part in cross section. , Figure 11 is an assembled side view of the same part, Figure 12 is an assembled side view of the same part.
The figure is an exploded perspective view of the paper presser roller support mechanism, No. 13.
The figure is a side view of the same part, Figure 14 is a perspective view showing the surrounding area of the stamp mounting plate, Figures 15a and b are perspective views showing left and right locking members, and Figures 16a and b are left and right locking members. FIG. 3 is a perspective view showing the relationship between the member and the stamp mounting plate. 1a, 1b...Frame, 4...Platen, 7
... Paper supply guide, 46 ... Lower guide plate, 47
... Upper guide plate, 4 ... Partition wall, 52 ... Paper feed roller, 53 ... Roller shaft, 54 ... Roller shaft bearing, 55 ... Convex part, 56 ... Concave part, 63 ... Pinch roller (paper presser foot roller).

Claims (1)

[Scope of Claims] 1. A platen, a printing head disposed opposite to the platen, a paper supply guide having a partition wall through which printing paper is inserted and regulating movement in the width direction of the paper, and a paper supply guide provided with the partition wall by the platen. A roller shaft bearing is pressed and fixed against a wall, a paper feed roller is rotatably supported by the roller shaft bearing, and the printing paper inserted through the paper supply guide is held between the paper feed roller and the paper feed roller. A paper feeding mechanism for a printer, comprising a paper holding roller that rotates to guide the paper between the platen and the printing head. 2. A patent claim characterized in that the paper supply guide is composed of a lower guide plate and an upper guide plate, the lower guide plate is provided with the partition wall, and both guide plates are integrated by the pressing force of a platen. A paper feeding mechanism of the printer according to item 1. 3. The paper feeding mechanism for a printer according to claim 1, wherein the partition wall and the roller shaft bearing are stably held by a concave-convex fit.