JPS63309481A - Printer - Google Patents

Abstract

PURPOSE:To obtain a printer having a movable-type hopper and capable of printing with high printing quality even when paper size is changed, by a construction wherein a pair of driving feed rollers are slidably fitted to driving shafts, and arms provided respectively for a pair of hoppers slide the driving feed rollers on the driving shafts. CONSTITUTION:Even when the size of slips 5b is changed and a side plate 22 is moved in a transverse direction A or B orthogonal to a feeding direction, each of rollers 28, 30a, 30b is moved in the direction A or B together with the side plate 22. Since the side plate 22 is provided on either side in the transverse direction of the slips 5b, the slip 5b is always driven by having left and right end parts thereof clamped between upper and lower feeding rollers 30a, 30b, irrespective of the change in the size of the slips 5b. Therefore, feeding forces exerted on the slip 5b on the left and right sides are always balanced, so that skewing or wrinkling of the slip 5b is prevented, and stable high printing quality can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer, and particularly to a sheet feeding structure for a cut sheet in an automatic sheet feeding mechanism.

[Conventional technology]

The automatic paper feed mechanism of the printer includes a paper feed roller and a paper feed roller to automatically convey each sheet from a hopper to a printing unit.

The example showing such a mechanism is Utility Model Act 1986-140.
There is a publication No. 22.

[Problem that the invention seeks to solve]

Conventionally, the feed roller is often provided on the hopper side, and the feed roller is often provided on the printer frame side. Some hoppers are movable to accommodate printing on paper of various sizes. In such a case,
Since the position of the feed roller is fixed, the position of the feed roller does not change even if the size of the paper changes, so the conveyance force that each sheet receives from the feed roller is unbalanced in the left and right directions perpendicular to the paper conveyance direction. This is often the case. This unbalanced conveyance force may cause the paper to tilt with respect to the conveyance direction during conveyance, or cause a drop in the paper, resulting in a decrease in print quality.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a printer that has a movable hopper and can provide high print quality even when the paper size changes.

[Means for solving problems]

The present invention is characterized in that each of the pair of driven feed rollers is supported by a shaft provided on a pair of hoppers together with a feeding roller, and the pair of driven feed rollers is slidably mounted on the drive shaft. An arm mounted on each of the pair of hoppers causes each drive feed roller to slide on the drive shaft.

[Effect]

In the present invention, the distance between the side plate of the hopper and the driving and driven rollers is made equal on the left and right sides.

Even if the paper size changes, the left and right sides are perpendicular to the conveyance direction.

The distance between the edge of the paper and the feed roller in the horizontal direction remains the same in both the left and right directions. Therefore, the paper receives the same conveying force in the left and right directions, and the paper is not tilted in the conveying direction.
It doesn't wrinkle or wrinkle.

〔Example〕

Embodiments of the printer according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is the printer body, 2 is a print head, 3 is a platen, 4 is a horizontal table, 5a is a manually printed sheet, and 6 is a sheet 5.
7 is a conveyor roller for continuous paper, 8 is a pull tractor for paper 7, 9 is a cover, 10 is a conveyance path for paper 7, 11 is a presser for paper 7, 20 is an automatic paper feeding mechanism for single sheet 5b, and 28 is for single sheet paper 7. A feeding roller for the slip 5, and a feeding roller 30 for the cut slip 5b.

40 is a stacker for single sheets 5a and 5b. A guide section 10 is provided below the horizontal table 4 in the printer main body 1 for inserting continuous paper 7 from the outside and guiding it to the platen 3. As shown in FIG. 2, the horizontal table 4 is connected to the printing section 2. It can rotate upward using one end on the platen 3 side as a fulcrum.

Further, the pull tractor 8 is provided within the printer main body 1 on the rear discharge side of the printing section 2 and the platen 3.

A paper presser 11 is provided on the upper surface of the guide section 10 and is bone-biased so as to press the continuous paper 7 in the direction of the guide section 10 . Further, as shown in FIG. 2, the cover 9 is rotatable upward using the vicinity of the end of the printer body 1 on the discharge side as a fulcrum.

During manual operation, the cut sheet 5a is inserted from the upper surface of the horizontal table 4, is conveyed by the conveyance roller 6, and reaches the lower part of the print head 2.

The print head 2 prints on the cut sheet 5 between the print head 2 and the platen 3, and after printing, the sheet is discharged to the stacker 40 side by the conveyance roller 6 or returned onto the horizontal table 4 again.

3 and 4 show the automatic paper feeding mechanism 20. FIG. The horizontal shafts 21a, 21b, and 21c are fixed to the printer main body 1, and a pair of opposing side plates 22 are supported on the horizontal shafts so as to be movable in the directions shown by arrows A and B. Note that in FIG. 3, only one side plate 22 is shown. A horizontal plate 23 is provided inside the side plate 22. The horizontal plate is rotatably supported by a shaft 24 in front of the side plate. Horizontal board 23
A square shaft 25 passes through the lower rear side plate 23a. A flange portion 22a is provided at the lower rear of the side plate 22, and a compression spring 26 is provided between the flange portion and the horizontal plate 23.

A paper tray 27 is fixed to the square shaft 25 between the side plates 22. Horizontal board 23. The upper surface of the paper tray 27 is positioned on the same plane, and the paper sheet 5b shown in FIG.
A large number of sheets are set. That is, the horizontal plate 23. Paper tray 27
The square shaft 25 is pressed down against the compression spring 26 by a lever (not shown) provided outside the printer main body 1, and then a large number of sheets are set.

Thereafter, by disengaging the lever, the horizontal plate 23,
The paper tray 27 rises in the direction of arrow C. At this time, horizontal axis 2
Since feed-out rollers 28 are provided at 1a and 21b, the ticket is held between the horizontal plate 23 and the feed-out rollers 28.

The feeding roller 28 is rotated in the direction of the arrow by a gear mechanism (not shown). Side plate 22. In order to maintain the gap between the paper receivers 27, a spring 29 is provided between them through the square shaft 25.

Arms 22b and 22c are provided on the side plate, and the arm 22
A driven feed roller 30a is rotatably supported on the arm 22c, and a U-shaped holder 31 that can accommodate the driving feed roller 30b is provided on the arm 22c.

Holder 31. A square shaft 32 passes through the drive speed reroller 30b. A round hole is provided in the holder 31 and a square hole is provided in the driving feed roller 30b at the point where the square shaft 32 passes through. Therefore, when the square shaft 32 rotates in synchronization with the horizontal shafts 21a and 21b, the drive roller 30a rotates, but the holder 30
b does not rotate. A slight compressive force is applied between the drive feed roller 30b and the driven feed roller 30a, and when the drive feed roller 30b rotates, the driven feed roller 30a
is rotated in the direction of the arrow by the frictional force, and the cut 5b is conveyed toward the print head 2.

The size of the cut sheet 5b has changed, and the side plate 22 is A.

Even if the rollers 28, 30a, and 30b are moved in either the right or left direction perpendicular to the conveying direction indicated by B, the rollers 28, 30a, and 30b move in the directions A and B together with the side plate 22. Since the side plates 22 are present on both sides of the edge of the cut sheet 5b in the left and right lateral directions, even if the size of the cut sheet 5b changes, the cut sheet 5b always moves the left and right ends of the cut sheet 5b to the upper and lower feed rollers 30a, 30b. It is moved by being sandwiched between.

Therefore.

The conveying force applied to the ticket 5b is not unbalanced in the left and right directions, and the ticket 5b is not tilted or wrinkled with respect to the transportation direction, making it possible to obtain stable high printing quality. can.

When setting continuous paper, feed out the side plate 22 in the direction of arrow A using roller 28. Feed roller 30a.

30b, to be moved together with the paper tray 27. This is because the pair of side plates 22 are separated from each other, and the horizontal shafts 21a to 2
This is achieved by supporting 1c and 32 so that they can slide left and right.

By moving the side plate 22, a wide space can be created between the printer main body 1 and the side plate 22, so the operator inserts his hand into this space and inserts the leading edge of the continuous paper 7 onto the guide section 10 at the bottom of the horizontal table 4. The continuous paper is guided through the paper holder 11 onto the platen 3 below the printing section 2, and is engaged with the sprocket of the pull tractor 8 through sprocket holes formed on both sides of the continuous paper.

Thereafter, the side plate 22 may be moved in the direction of arrow B to return to its original state, and the cut sheet may be set here.

At this time, if the horizontal table 4 is rotated upward around one end on the platen side as shown in FIG. 2, the operation of setting the continuous paper 7 will be facilitated.

Similarly, if the cover 9 is also rotated upward, the continuous paper 7
The operation of passing the paper between the printing section 2 and the platen 3 and engaging it with the pull tractor 8 also becomes easier.

By operating the pull tractor 8, the printing section 2 sequentially prints on the continuous paper 7, and stacks the continuous paper 7 on the lower part of the discharge side of the printer main body 1, as shown in FIG. The continuous paper 7 is inserted from the front and can be set in the printing section without passing through the conveyance roller 6, and printing can be performed. Even when printing on 1112 forms 5 by manual operation or automatic paper feeding operation, there is no need to remove the continuous paper 7 wound around the platen 3, and since simultaneous setting is possible, operability is significantly improved. Furthermore, it is possible to print on the cut sheet 5 and the continuous paper 7 at the same time.

Although the paper trays 27 shown in FIG. 3 are each independent, they may be arranged in a zigzag arrangement in which the ends are movably connected to each other. The side plate 22 also has three horizontal shafts 21a to 21. Although it is designed so that the side plate c passes through it, a single horizontal shaft may pass through it as long as the side plate can be stably supported.

〔Effect of the invention〕

As explained above, according to the present invention, even if the size changes, the conveyance force applied to the ticket does not change in the left and right directions.
A printer with high print quality can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a printer according to an embodiment of the present invention, Fig. 2 is a perspective view of the printer shown in Fig. 1, and Fig. 3 is a portion of an automatic paper feeding mechanism used in the printer shown in Fig. 1. FIG. 4 shows the automatic paper feeding mechanism used in the printer of FIG. , is a cross-sectional view taken along the BB' cutting line. 1... Printer body, 2... Print head, 3...
Platen, 5b...single sheet, 20...automatic paper feeding mechanism,
21a to 21c...horizontal axis, 22...side plate, 22b,
22c...Arm, 23...Horizontal plate, 25,32.
...square axis, 28...¥-1 second country dispute 30 64 mouths (1!Z)

Claims (1)

[Claims] 1. In a printer equipped with an automatic sheet feeding mechanism, the automatic sheet feeding mechanism is provided with a pair of opposing sheets so as to be movable along at least one horizontal axis provided on the printing unit side. Side plates are provided, a horizontal plate is rotatably supported in front of the inner side of each opposing side plate, a feeding roller is engaged with the horizontal shaft, and a roller side end of each horizontal plate is provided with a feed roller. Two arms are provided at the end of each of the side plates on the side of the printing part, each arm has a driven feed roller supported pivotally, and each other arm has a means for pressurizing the part toward the roller side. is rotated by a second horizontal shaft and has a driving feed roller that can slide on the horizontal shaft, and the driven feeding roller rotates with the rotation of the driving feeding roller, and the The pair of side plates can be moved horizontally along each horizontal axis together with the horizontal plate, each roller, and the pressure means, and a cut sheet is interposed between the feeding roller and the horizontal plate and between the driving feed roller and the driven feed roller. 1. A printer characterized in that each roller rotates in a direction that transports a ticket to a printing unit in a state in which the ticket is transferred to a printing unit. 2. The printer according to claim 1, characterized in that a flange portion is provided on the inner rear side of each side plate, and a compression spring is provided between the flange portion and each horizontal plate. 3. In claim 1 above, a vertically movable horizontal shaft is further provided near the roller, and the horizontal shaft passes through a side plate provided below the roller side end of each horizontal plate,
A printer characterized in that the horizontal axis is provided with a paper tray that is movable horizontally and is flush with the horizontal plate.