JPS58151280A - Automatic tension adjusting mechanism for paper in printer - Google Patents

Abstract

PURPOSE:To provide the titled mechanism easy to operate and capable of avoiding troubles due to a failure in operation, by interlocking a tension-adjusting mechanism for a paper with a paper thickness adjusting mechanism so that an appropriate tension on the paper can be obtained by simply operating the paper thickness adjusting mechanism. CONSTITUTION:An eccentric cam 14 is rotated by a knob 17 to slightly rotate a gate hinge 13 with a hinge shaft 15 as a center, and a gate 17 is moved to change the distance between a printing hammer 2 and a platen 8 and that between the hammer 2 and a type belt 9. On the other hand, one end of each torsion spring 5 having the other end fixed to a shaft 6 is abutted against the lower end of each of paper-pressing plates 3, and the pressure exerted on the paper by the plates 3 is changed through changing the forces of the springs 5 by rotating the shaft 6. A belt 16 connects the cam 14 and the shaft 6 to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic paper tension adjustment mechanism in a character device.

In such a printing device, in order to print clearly according to the thickness of the paper used, the distance between the printing hammer and the type carrier or platen must be set appropriately. That is, a paper thickness adjustment mechanism is required that makes the thickness narrower for one copy of paper and wider for multiple copies.

Appropriate tension must also be applied to the paper during printing. The stronger the tension applied to the paper, the less the paper will sway or fluctuate during printing and paper feeding, resulting in better print quality. On the other hand, if the tension is too strong, it may cause tears at creases such as perforations and perforations. Become. Generally, paper has different rigidity depending on its thickness, so a paper tension adjustment mechanism is required to provide an appropriate tension depending on the thickness of the paper.

Conventionally, the paper thickness adjustment and paper tension adjustment were performed separately depending on the paper thickness, which resulted in poor repeatability and problems that could occur if the user forgot to repeat the procedure.

The purpose of the present invention is to eliminate the drawbacks of the prior art mentioned in 1.
The present invention is characterized in that the pressing force by the paper tension adjustment mechanism is changed according to the thickness of the paper used. The paper thickness adjustment mechanism that changes the paper thickness is linked with the paper tension adjustment mechanism that adjusts the pressing force of the paper presser mechanism, so that the appropriate paper tension can be obtained at the same time by simply adjusting the paper thickness. It is something to do. Hereinafter, the present invention will be described with reference to drawings of 1ζ embodiments.

In the figure, the paper thickness is adjusted by the eccentric cam 1 by the /b 17.
Rotate 4 and attach the date hinge 13 to the hinge shaft 15.
Rotate slightly around the center. Accordingly, the date 7 moves and the distance between the printing hammer 2, the platen 8, and the printing belt 9 is changed.

On the other hand, the other end of the torsion spring 5, one end of which is fixed to the shaft 6, is placed against the lower end of the paper press plate 3 supported by the pivot pin 4. By rotating the shaft 6, the spring 5 is By changing the force, the paper pressing force of the presser plate 3 can be changed. As a result, an appropriate pressing force, that is, paper tension, can be applied to the paper 12 according to the thickness of the paper.

The shaft 6 is rotatably supported by the mechanical frame 1. The belt 16 connects the eccentric cam 14 and the shaft 6, and is directly connected to the eccentric cam 14. knob 1
7 to adjust the paper thickness, the shaft 6 rotates via the belt 16, and it is possible to automatically obtain an appropriate paper tension.

In the above embodiment, the paper thickness adjustment mechanism and the paper tension adjustment mechanism are linked by the belt 16, but gears, links, or cams may also be used. Furthermore, an electrical transmission method may be used instead of the mechanical transmission force method. That is, in this case, an encoder for calibrating the rotational position is attached to the shaft of the 7-piece 17, and the shaft 6 is driven by a pulse motor or a servo motor controlled by the calibrator of the encoder. When the rotational position signal of the seventh tab 17 is generated, the shaft 6 is driven by the motor so as to rotate to a position where a pressing force corresponding to the sheet thickness is generated. As a result, the pressing force by the presser plate 3 is changed by the toshishin spring 5. □As described above, according to the present invention, since the paper thickness adjustment mechanism and the paper tension adjustment mechanism are linked, the paper thickness adjustment mechanism and paper tension adjustment mechanism can be properly adjusted in one operation, and the operation is simple and easy. It is great to be able to prevent problems caused by forgetfulness.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view, and FIG. 2 is a perspective view. In the figure, 1 is a mechanical frame, 2 is a printing plate, 73 is a presser plate, 4 is a pivot pin, 5 is a toss tongue spring, 6 is a shaft, 7 is a date, 8 is a platen, 9
1 is a type belt, 1 ( ) is an ink ribbon, 11 is a tractor, 12 is paper, 13 is a date hinge 14 is an eccentric cam, 1
5 is a hinge shaft 7), 16 is a belt, and 17 is a knob. Name of patent applicant Hitachi [m Co., Ltd. Fang 1 item!

Claims (1)

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