JPS5925661Y2 - Printer paper feed mechanism - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a paper feeding mechanism for a printer used, for example, in a cash register.

Conventionally, in printers such as cash registers, as a mechanism for feeding paper into the printing section, for example, as shown in Fig. 7, a pinch roller is pressed against the paper feed roller with a leaf spring, etc., and the paper inserted between the two is fed. A mechanism for feeding the printer by rotationally driving the rollers is used, but in this case, a pinch roller is required, and a leaf spring is also required to press the pinch roller, so the structure is complicated and it is difficult to miniaturize the printer. Moreover, the cost also increases.

In addition, as shown in Figure 8, when pressing paper with a spring steel plate, the plate is shaped so as to follow the outer periphery of the paper feed roller, and the plate is pressed so as to be in direct contact with the paper feed roller, and the paper inserted between them is pressed. A mechanism that increases the friction with the paper feed roller and rotates the paper feed roller to feed the paper is also used, but in this case, if the paper feed roller rotates with no paper inserted, the paper will not be pressed against the plate. The rotation is very heavy due to friction between the paper feed roller and there are problems such as impairing the durability of parts, and if the friction is reduced, slipping will occur during normal paper feeding, resulting in poor feeding. becomes.

This invention was proposed in order to eliminate the above-mentioned conventional defects, and improves the durability and reliability of the paper feeding mechanism by improving the conventional method shown in FIG. 8 described above.

Hereinafter, the structure of the present invention will be explained with reference to the attached drawings of one embodiment. Figure 1 is a perspective view of a cash register to which this invention is applied, showing a keyboard 1, a display 2, a receipt outlet 3, etc. It has a power supply circuit and an arithmetic control circuit (both not shown) on the top surface, and is covered with a cover 4.
A drawer 6 is provided at the bottom.

Further, a printer 7 is built inside the sheet outlet 3 side as shown in FIG. 2, which is a schematic side view.
The paper 9 loaded in the roll paper holder 8 is sent by a paper feed mechanism 10 to a printing unit formed by a printing drum 11 and a hammer 12, and the printed paper is cut by a cutter 13 and discharged from the receipt output port 3. It has become.

To explain this paper feed mechanism 10, as shown in FIG.
A plurality of paper feed rollers 18 are fixed to this roller shaft 16 at appropriate intervals.

As shown in FIG. 4, which is a side view of the paper feed mechanism 10, the paper feed mechanism 10 has an arcuate portion 19 bent at a curvature that roughly follows the outer periphery of the paper feed roller 18, and a flat portion 20 that serves as a guide for paper insertion. As shown in FIG. 5, which shows a plan view of the feeding mechanism, the paper is pressed by a spring steel plate whose portion facing the paper feeding roller 18 is notched to form a root 21, and an arcuate portion 19 is formed between the paper feeding rollers 18 and The arcuate portions 19 are located at both ends of the paper feed roller 18, and as shown in FIG. 6, which shows a state in which no paper is inserted, the arcuate portions 19 are located closer to the center than the outer peripheral surface of the paper feed roller 18 plus the thickness of the paper. So this paper pressing is root 21
is fixed to the printer frame, and the paper feed roller 18 and the arcuate portion 19 of the paper pressing root 21 sandwich the paper alternately in the width direction.

Since the present invention is formed as described above, the flat portion 20
The paper 9 inserted along the paper feed roller 18 and the arcuate portion 19 alternately pinch the paper 9, but the arcuate portion 19 feeds the paper slightly more than the outer peripheral surface of the paper feed roller 18 plus the paper thickness. The paper is pushed toward the center of the roller 18, and since the root 21 has a leaf spring action, the paper is pressed against the outer periphery of the paper feed roller 18 by the arcuate portion 19.
Therefore, when the paper feed motor 14 is driven to rotate the paper feed roller 18, sufficient friction is generated between the paper feed roller 18 and the paper to move the paper, so that the paper is fed into the printing section.

When no paper is inserted, paper feed roller 1
8 and the paper presser are not in contact with the plate 21, no unnecessary frictional force acts on the paper feed roller 18, and its rotation is light, so that the durability of each part of the paper feed mechanism is not impaired.

In addition, the number of paper feed rollers 18 may be provided in a large number instead of two as in the embodiment, in which case the paper is pressed by the arc-shaped portion 19 of the root 21.
It is also possible to leave only the space between the paper feed rollers and omit both ends.

Moreover, it goes without saying that this invention is applicable not only to cash registers but also to printers as output devices for accounting machines, computers, or their application equipment.

As explained above, according to the present invention, it is possible to accurately perform paper feeding operation with an extremely simple structure.
Moreover, it has the practical effect of improving the durability of the paper feeding mechanism.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a cash register to which the printer paper feed mechanism of the present invention is applied, FIG. 2 is a schematic side view of the printer section of the same cash register, and FIG. 3 is a perspective view of the paper feed mechanism of the present invention. Figure 4 is a side view of the main part, Figure 5 is a plan view of the main part, Figure 6 is a side view of the main part without paper being inserted, and Figures 7 and 8 are the conventional paper feeding mechanism. FIG. 2 is a schematic side view and a schematic perspective view of FIG. Code explanation, 1...Keyboard, 2...
Display, 3...Receipt outlet, 4...
・Cover, 6... Drawer, 7... Printer, 8... Roll paper holder, 9...
・Paper, 10...Paper feed mechanism, 11...
・Print drum, 12...Hammer, 13...
... Cutter, 14 ... Paper feed motor, 15
．． 17... Gear, 16... Paper feed roller shaft, 18... Paper feed roller, 19...
・Arc-shaped part, 20...Flat part, 21...
The paper press is a board.

Claims (1)

[Scope of utility model registration request] A plurality of paper feed rollers 18 are fixed at appropriate intervals to a rotationally driven paper feed roller shaft 16, and the paper pressing method has an arcuate portion 19 bent to a curvature that roughly follows the outer circumference of the paper feed roller 18. The plate 21 is positioned between the paper feed rollers 18 or between the paper feed rollers 18 and at both ends thereof, and when viewed from the side, the arcuate portion 19 of the root 21 is placed on the outer circumferential surface of the paper feed roller 18 so that the paper is pressed. The paper feed roller 18 and the paper presser are positioned so as to be slightly toward the center than the added dimension, and are fixed to the printer frame, and the paper feed roller 18 and the paper pusher alternately pinch the paper inserted between the base 21 in the width direction. A paper feed mechanism for a printer, characterized in that the paper feed roller 18 is shaped so as to generate a frictional force against the paper.