JPS61166446A - Paper feeding device - Google Patents

Abstract

PURPOSE:To easily pull-out a paper sheet in the opposite direction to the paper feeding direction by prohibiting the revolution of a frictional roller for separat ing the paper sheets press-attached onto a paper feeding roller and permitting the revolution in the opposite direction to the paper feeding direction. CONSTITUTION:When a paper feeding roller 3 is revolved counterclokwise (A direction), the paper sheet 2a in the uppermost part is transported in the paper feeding direction (A direction). Since, in this case, the clockwise revolution (opposite direction to the paper feeding direction) of a frictional roller 9 is progibited by a spring clutch 13, the advance of the paper sheets 2 ... succeeding to the second paper sheet is suppressed. When the aparatus stops in the state where the paper sheet 2a is nipped between the paper feeding roller 3 and the frictional roller 9 by a certian cause, the paper sheet 2a is pulled-out in the B-direction, and then the frictional roller 9 revolves in the B-direction. Therefore, the paper sheet 2a can be easily pulled-out in the opposite direction (B direction) to the paper feeding direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to a paper feeding device incorporated into a copying machine, a printing machine, etc.

1 Port 1 Prior Art Conventional paper feeding devices, as described in Japanese Patent Publication No. 58-7582, for example, are equipped with an immovable friction plate on the downstream side of the stacked paper, so that the primary There were such inconveniences.

In order to clarify the disadvantages of the conventional technique, the conventional device will first be explained with reference to FIG.

In this figure, (1) is a paper feed tray on which sheets of paper (2), etc. are loaded and stored. A paper feed roller (3) is provided which is pressed against the paper (2a).Furthermore, the paper feed roller (3) is provided downstream of the downstream edge of the stacked paper (2). A friction plate (4) is provided which is in pressure contact with the paper (3) and separates the paper (2) one by one during paper feeding.This friction plate (4) is made of urethane rubber, and the lower part It is fixed to the upper surface of a lever (6) which is swingable about the support shaft (5).The back surface of the lever (6) and the base (7) are fixed to each other. A compression spring (8) is interposed between the levers (6
) is pressed counterclockwise, that is, toward the center of the paper feed roller (3).

In such a conventional *tl, when the paper feed roller (3) rotates in the paper feeding direction (input direction), several sheets of paper (2), including the top one (2a), are on the downstream side. will be sent to. However, the second sheet of paper from the top <2
1-... are blocked by the friction plate (4), so only the uppermost sheet (2a) is separated and fed.

However, for some reason, 1itliie paper (2a)
The apparatus may stop while the paper (2a) is being held between the paper feed roller (3) and the friction plate (4), and the paper (2a) may no longer be inserted. In such a case, the paper (2a) may be pulled in the direction (B direction) opposite to the paper feeding direction (input direction), but if this is done, the friction plate (4) will also have a counterclockwise position. A rotational force in the direction is added, and as a result, +! The paper (2a) marked 0 is held between the paper feed roller (3) and the friction plate (4) with a force that exceeds the pressing force of the compression spring (7). Therefore, the paper (2a) cannot be pulled out in the direction opposite to the paper feeding direction (direction B), and there is a risk that the paper (2a) may break if pulled out forcibly.

(C) Problems to be Solved by the Invention As mentioned above, in the conventional technology, if the apparatus stops while the paper (2a) is being held between the paper feed roller (3) and the friction plate (4), , it was difficult to pull out the paper (2a) in the direction (B direction) opposite to the paper feeding direction (input direction). In this case, if the paper (2a) is forcibly pulled out, the friction plate (4) will peel off and the paper (2a) will break.
There is a problem in that the fragments remain inside the device and cause the device to malfunction.

MEANS FOR SOLVING THE PROBLEMS The present invention provides a paper feed table on which sheets are stacked, and a paper feed table provided at the upper part of the paper feed table near the downstream edge along the paper feeding direction, so that the uppermost sheet a paper feed roller that is pressed into contact with the paper feed roller, and a friction roller that is pressed against the paper feed roller on the downstream side of the downstream edge of the stacked paper sheets and separates the paper sheets one by one during paper feeding;
This paper feeding device is equipped with means for prohibiting rotation of the friction roller in the paper feeding direction and only allowing rotation in the opposite direction to the paper feeding direction.

(E) Function In the present invention, the friction roller for paper separation that is in pressure contact with the paper feed roller has a half ring that prohibits rotation in the paper feed direction and allows rotation in the opposite direction to the paper feed direction. Since the paper is attached, when the paper is pulled out in the opposite direction to the paper feeding direction, the paper can be easily pulled out without breaking.

(F) Embodiment FIGS. 1 and 5 are a sectional view and a perspective view of essential parts showing an embodiment of the present invention. Note that the same parts as those in the conventional device (FIG. 2) are given the same reference numerals and explanations will be omitted.

In these figures, the loaded paper (2)...
A friction roller (9) made of urethane rubber that is pressed against the paper feed roller (3) is provided downstream of the downstream edge of the paper feed roller (3). This friction roller (9) is attached to a holding shaft fi fixed to an angle U that can swing around a supporting shaft CIQ.
3 through a spring clutch 0 as a one-way clutch. Therefore, the friction roller (9) is prohibited from rotating in the paper feeding direction (input direction).

Only rotation in the opposite direction (direction B) will be permitted.

α4 is a tension spring that urges the first angle (111) to rotate in the counterclockwise direction around the support shaft θQ, (15
Reference numeral 1 denotes a guide plate rotatably mounted on the support shaft α. Further, (1e is a compression spring that urges the guide plate a51 to rotate clockwise.

The friction roller (9), the support shaft a, the guide plate αS, and the tension spring (14, etc.) are unitized and incorporated into one holding fitting, and this holding fitting ηη It is fixed to the main body of the apparatus (copying machine, etc.) with a long hole and screws (not shown).

This Fil! In the embodiment, when the paper feed roller (3) rotates counterclockwise (input direction), the uppermost paper (2a) is transferred in the paper feed direction (input direction), but at this time, the friction roller ( 9) is prohibited from rotating clockwise (in the direction opposite to the paper feeding direction) by the spring clutch i1, so that the second and subsequent sheets (2) are prevented from moving forward. Therefore, only the uppermost sheet (2a) is separated and transported in the sheet feeding direction (input direction).

If the device stops for some reason while the paper (2a) is being held between the paper feed roller (3) and the friction roller (9), this paper (2a) is moved in the paper feed direction. When pulled out in the opposite direction (direction B), the friction roller (9) rotates counterclockwise (direction B). Therefore,
This paper (2a) is easily pulled out in the opposite direction to the paper feeding direction (CB direction).

FIG. 4 is a partial sectional view of a copying machine equipped with two paper feeding devices of this embodiment. In this figure.

G9■ is a paper feed tray (llf) loaded with paper (2)...
llf: A spring that pushes up the paper feed rollers (3) (3)K, and ■■ is a pair of register rollers provided on the downstream side of the paper feed rollers (3) (3).

(G1 Effects of the Invention In the present invention, the friction roller for paper separation that is in pressure contact with the paper feed roller is provided with means for prohibiting rotation in the paper feeding direction and allowing rotation in the opposite direction to the paper feeding direction. Since the paper is attached, when the paper is pulled out in the opposite direction to the paper feeding direction, the friction roller rotates in the opposite direction and the paper can be easily pulled out. It won't break down.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view showing a conventional device, Fig. 5 is a perspective view showing main parts of an embodiment of the invention, and Fig. 4 is an applied example. FIG. (1)... Paper feed tray, (2)... Loaded paper. (2a)...Top paper, (3)...Paper feed roller. (9)...Friction roller% a3...Holding shaft, 031
...Spring clutch (one-way clutch).

Claims (1)

[Claims] 1. A paper feed table on which paper is stacked, and a paper feed provided at the upper part near the downstream edge of the paper feed table along the paper feeding direction and pressed against the topmost paper. the roller and the paper feed roller on the downstream side of the downstream edge of the stacked paper;
A feeder equipped with a friction roller that separates sheets one by one during paper feeding, and a means for prohibiting rotation of this friction roller in the paper feeding direction and only allowing rotation in the opposite direction to the paper feeding direction. paper equipment. 2. A patent claim in which the means for prohibiting rotation of the friction roller in the paper feeding direction and only allowing rotation in the opposite direction to the paper feeding direction is a one-way clutch provided on the holding shaft of the friction roller. The paper feeding device according to item 1.