JPH1016335A - Paper pressing device in printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper pressing device in a printer fixing paper to a printing stand at a time of printing to prevent printing shift. SOLUTION: This paper pressing device is constituted so as to press and fix papers to a printing stand at a time of printing while moving a printing head to the paper placed on the printing stand 7. In this case, a paper presser 9 partially protruding on the printing stand 7 is arranged in an up and down movable manner and a drive means A for urging a press part 10 so as to press the same to the printing stand 7 and upwardly revolving the paper presser 9 against the above mentioned urging when the printing head 6 returns to a standby position in connection with the motor 4 for moving the printing head 6 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper holding device in a printer for fixing paper when printing.

[0002]

2. Description of the Related Art Conventionally, as a printer for printing a money amount on a paper such as a check or a bill, a printing wheel having numbers, symbols, symbols such as ￥ or commas engraved on a peripheral surface is arranged side by side, and the amount is adjusted according to the entered money amount. 2. Description of the Related Art There has been known a method in which a printing wheel is rotated to select an input amount of money, and then the selected printing wheel is simultaneously shot down and printed on paper. In this printer, since there are many mechanical parts and many parts, it is difficult to reduce the manufacturing process and the manufacturing cost. There are printers of the type that prints while moving one printing wheel, but the problem remains the same. For this reason, printers have been considered in which the printing wheel is replaced with a dot print head, and the dot print head is moved to print out by printing dot pins in accordance with the font.

[0003]

However, when printing on a paper such as a check or a promissory note, the print head moves while the dot pins are protruding and retracting from the print head. Rubbing the paper to move the paper, and there is a problem that a printing displacement occurs in which printing cannot be performed at a correct position on the paper.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a paper holding device in a printer for fixing a paper to a printing table at the time of printing and preventing printing displacement.

[0005]

In order to solve the above-mentioned problems, a paper holding device in a printer according to the present invention performs printing while moving a print head on a paper placed on a printing table, and also prints the paper at the time of printing. In a paper press device in a printer that presses and fixes the paper press on the print table, a paper press that partially extends over the print table is disposed so as to be vertically movable, and is urged to press the paper press against the print table, When the print head returns to the standby position in conjunction with the motor for moving the print head, a drive means is provided for rotating the paper press upward against the bias.

[0006]

1 and 2 show a printer to which a paper holding device is applied. In this printer, an amount is input from a keyboard 1, the input amount is confirmed on a display 2, and an issue key 3 is pressed. By driving the motor 4,
The belt 5 is driven via a speed reduction mechanism, and the money is printed on the paper 8 placed on the printing table 7 while the print head 6 fixed to the belt 5 is moved. This printer is in a standby position (indicated by a dotted line in FIG. 2) when the motor 4 is stopped, moves leftward when the motor 4 rotates forward, and reversely rotates when the motor 4 moves to the left end to advance the print head 6. The motor 4 is controlled so as to move rightward by switching directions and stop when the motor 4 moves to the standby position. This printer is set so that a large character can be printed with a small number of dots by changing the front and rear positions of the print head 6 between the forward path and the return path. In FIG. 2, reference numeral 23 denotes a plastic platen whose cross section for forming an emboss on the back surface of a paper such as a check or a promissory note at the time of printing is formed in a zigzag shape.

The paper presser is provided with a paper presser 9 which partially projects onto the printing table 7 so as to be vertically movable, and urges the pressing section 10 with a spring 14 so as to press the printing table 7 against the printing table 7. When the print head 6 returns to the standby position in conjunction with the motor 4 for moving the print head 6, a driving means A for rotating the paper presser 9 upward against the bias is provided. .

The paper presser 9 is a plate member disposed below the print head 6, and a presser portion 10 made of an elastic material such as a rubber plate is fixed to a lower surface of a front portion thereof. The print head 6
An opening 9a is formed in a portion where the tip 6a of the
It is formed so that printing can be performed on the paper 8 exposed from the opening 9a, and the right and left ends are provided with upright edges 1 respectively.
1 is formed. The rear end of the paper presser 9 is located at the rear of the printer, and the upright edge 1 of the paper presser 9 is
A substantially center of 1 is rotatably supported on a frame 12 by a shaft 13 so that the paper presser 9 moves up and down. A lower end of a spring 14 is attached to a rear end of the paper presser 9, and an upper end of the spring 14 is hooked on a pin 15 formed on the frame 12, so that the rear end of the paper presser 9 is always pulled upward to hold the presser. The unit 10 is urged so as to be pressed against the printing table 7 (see FIGS. 3 and 4).

A drive mechanism A for moving the presser 10 upward against the urging means A is linked to a speed reduction mechanism comprising a plurality of reduction gears for reducing the rotation of the motor 4 for moving the print head 6. .

The driving means A is a bevel gear 18 which meshes with a gear 17 fixed to an output shaft 16 linked to a reduction mechanism.
And two cams 20 fixed near both ends of the rotating shaft 19 of the bevel gear 18.

The cam 20 is formed by forming a protruding portion 21 on a part of the circumferential surface of the disk. When the print head 6 is at the standby position, the protruding portion 21 stands up as shown in FIG. Rim 11
And presses down the rear end of the paper presser 9 against the spring 14 to rotate the presser 10 by rotating the shaft 13 as a center, and the motor 4 rotates to print. When the head 6 starts moving, the cam 20 rotates via the bevel gear 18 in conjunction with the rotation of the motor 4, and the pressing down of the roller 22 by the protrusion 21 of the cam 20 is released as shown in FIG. Accordingly, the paper presser 9 is provided so that the rear end thereof is moved upward by being urged by the spring 14, and is rotated about the shaft 13, the front end is moved downward, and the presser section 10 is pressed against the printing table 7. I have.

According to the paper pressing device having the above-described configuration, when the printer is turned on, the control unit (not shown) performs initialization,
The print head 6 is moved to the standby position by rotating the motor 4. When the print head 6 returns to the standby position, the bevel gear 18 rotates in conjunction with the speed reduction mechanism, and the cam 20 fixed to the rotating shaft 19 of the bevel gear 18 rotates. Print head 6
Moves to the vicinity of the standby position, the protrusion 2
1 moves to a position where the roller 2
2 is pressed down against the spring 14, so that the paper presser 9 is
3, the presser 10 moves upward. The control section stops the rotation of the motor 4 by detecting the arrival of the print head 6 at the standby position by appropriate means, so that the rotation of the cam 20 also stops, and the holding section 10 stops in the state of being moved upward.

Since the paper press 9 is stopped with the paper press 9 raised, the paper 8 can be set on the printing table 7 without being disturbed by the paper press 9 (pressing section 10). Enter the amount from the keyboard 1 and display the entered amount on the display 2
After confirming the above, when the issue key 3 is pressed, the control unit rotates the motor 4. When the motor 4 rotates, the print head 6 starts moving via the speed reduction mechanism. The cam 20 rotates in conjunction with the movement of the print head 6, and the projection 21 of the cam 20 releases the pressing down of the roller 22, so that the rear end of the paper presser 9 is urged by the spring 14 to move upward, so that the paper presser is pressed. Reference numeral 9 rotates around the shaft 13 and the paper presser 9 moves down to transfer the paper 8 to the printing table 7.
And fix it so that the position does not shift.

The print head 6 moves to the left end according to the dot drive signal from the control unit while driving in accordance with the rotation of the motor 4 and ejecting the upper half dot pin of the character. When the control unit moves to the left end, the control unit moves the print head 6 forward, reverses the motor 4 and strikes the lower half dot pin of the character while moving the print head 6 in the direction of the standby position. When the print head 6 moves to the left end, the cam 20 rotates forward by 180 degrees, but rotates reversely in conjunction with the reverse rotation of the motor 4.

The rotation angle of the cam 20 is controlled by the gear 17.
It is determined by the gear ratio of the bevel gear 18, but is not limited to 180 degrees. It is sufficient that the protrusion 21 of the cam 20 does not rotate until the protrusion 21 of the cam 20 engages the roller 22 while the print head 6 moves to the left end.

When the print head 6 moves to the vicinity of the standby position, the protruding portion 21 of the cam 20 engages with the roller 22 and pushes it down against the spring 14. Is rotated, and the front portion of the paper presser 9 (presser portion 1) is rotated.
0) moves upward and the pressing of the sheet 8 is released. When the print head 6 returns to the standby position, the motor 4 stops, and the rotation of the cam 20 also stops.
Since 0 is stopped in a state where the pressing of the paper 8 is released, the printed paper 8 can be taken out from the printing table 7.

As described above, when the print head 6 moves in the left-right direction while ejecting dot pins, the paper presser 9
Is moved downward by being urged by the spring 14, and the paper 8 is fixed to the printing table 7. Therefore, even if the print head 6 and the dot pins move while rubbing the paper a, the paper a does not shift and the print shift does not occur. It does not occur. In particular, for a printer that divides one character into upper and lower halves and prints the upper half on the forward path and the lower half on the return path, the deviation of the paper a is fatal to the print quality, but the deviation of the paper a during printing can be prevented. Therefore, high quality printing can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a printer to which a paper pressing device according to the present invention is applied.

FIG. 2 is a plan view showing a main part of the printer.

FIG. 3 is a side view showing a main part of the printer.

FIG. 4 is a front view showing a main part of the printer.

FIGS. 5A and 5B are operation explanatory diagrams showing an operation mode of a paper presser.

[Explanation of symbols]

 4 Motor 5 Belt 6 Print head 7 Print stand 8 Paper 9 Paper presser 10 Presser section A Drive means

Claims (1)

[Claims] 1. A paper holding device in a printer for printing while moving a print head on a sheet placed on a printing table and pressing and fixing the sheet to the printing table at the time of printing. The overhanging paper press is arranged so as to be movable up and down, and the paper press is urged to press the print press against the printing table. When the print head returns to the standby position in conjunction with the motor that moves the print head, the paper press A sheet pressing device in a printer, further comprising a driving unit for rotating the pressing unit upward against the bias.