JPS62222944A - Separatingly feeding device for sheet material - Google Patents

Abstract

PURPOSE:To securely prevent the occurrence of the double feeding and jamming of sheet materials by providing a paper feeding roller, a separating pad, and a separating auxiliary pad on the separatingly feeding device for sheet materials of the picture image forming device of a copying machine, etc. CONSTITUTION:As for the relation between a separating pad 11, separating auxiliary pads 12, and a paper feeding roller 14, the separating pad 11 is positioned opposite to the paper feeding roller 14, and the separating auxiliary pads 12 are positioned on both sides of the separating pad 11. When a start key is pressed, the paper feeding roller 14 is rotated feeding the sheet material P1 on the topmost position. At this time, sheet materials P2-Pi on the next position and after are also moved followingly, but, due to frictional force, these sheet materials are stopped at a nip part N in the paper feeding roller 14 and the separating pad 11. However, when the frictional force G between the sheet materials P is larger than normally due to, e.g., the effect of static electricity, etc., the sheet material P2 tends to run through the nip part N. In this case, the sheet material P2 is brought into contact with the pads 12 and stopped in a position where the pads 12 are projected out of the top face of the pad 11.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sheet material separation and feeding device, specifically, a sheet material separation and feeding device for an image forming apparatus such as a copying machine, a printer, or a printing machine. The present invention relates to a sheet material separation and feeding device that feeds sheet materials by frictional separation.

[Prior Art] A conventional device of this type will be described. As shown in FIG. 7, the paper feed roller 4 is in a position where it contacts the sheet date and separation pad 1. As shown in FIG. The sheet material is stacked on the middle plate 22 and lifted upward by a middle plate pushing spring 23 from below. As a result, the sheet material is constantly in contact with the paper feed roller 2.

Then, when a start key (not shown) is pressed, the paper feed roller 2 rotates (in the illustrated example, in the counterclockwise direction) and feeds the uppermost sheet 44'Pt. At this time, the second sheet material P2 tries to move together due to the frictional force with the sheet material P1, but the sheet materials P after the sheet material P2 are stopped by the separation pad 1. This is calculated by assuming that the frictional force between the paper feed roller 2 and the sheet material P1 is F, the frictional force between the sheet material 2 is G, and the repulsive force between the tip of the sheet material P and the separation pad 1 is H. This is because the frictional force is F>>H>G.

Then, as shown in FIG. 7, the sheet materials P are separated one by one by being sequentially illuminated by the tip of the sheet material or the separation pad 1, and only the uppermost sheet material P is fed.

However, the part where the sheet material P is actually separated by the separating rose i-1 is near the point N where the paper feed roller 4 and the separation pad 1 are in contact, and the sheet material P is actually separated by the separating rose i-1, and the part passes over this point as shown in FIG. In some cases, it may not be possible to separate the material I and material P sufficiently.

This is because as the frictional force H of the separation pad 1 is increased, the balance with the frictional force F of the paper feed roller 4 becomes worse depending on the paper quality of the sheet material P, and the uppermost sheet material P1 may not be conveyed. Therefore, it is not possible to reduce the frictional force of the separated rose too much.

As a countermeasure, the separating pad 11 butt 1 may be curved so as to follow the paper feed roller A so that it can easily separate even after passing the contact point N. In this case, the center of the curved surface of the separating pad 1 and The center of the paper feed roller 4 must be roughly aligned.
Part accuracy becomes an issue.

Furthermore, if the pressure applied to the wheel is increased in order to increase the separation force, paper may jam between the separation bat and the paper feed roller.

[Object of the invention] The wooden invention was made in view of the drawbacks of the above-mentioned conventional examples.
It is an object of the present invention to provide a sheet material storage 1 feeding device that reliably prevents double feeding of sheet materials.

[Means for Solving the Problems] In order to achieve the second object, the sheet material separation feeding device according to the present invention separates the sheet materials stacked on the loading section one by one. In a sheet material separation feeding device, a rotating part that feeds the sheet material, a friction member that is provided opposite to the rotating member and frictionally separates the sheet material, and a position that is not opposed to the rotating member. It is characterized in that it has an auxiliary friction member provided at 6 and partially protruding from the friction portion blades toward the rotating member side.

[Example] Figures 1 to 6 show examples of the wooden invention, 11 is a separation pad as a friction member, 12 is a separation auxiliary pad as an auxiliary friction member, 13 is a swinging pad holder, and 14 is a separation pad holder. A paper feed roller is a rotating member. The relationship between the separation bat 11, the separation auxiliary pad 12, and the paper feed roller 14 is as follows:
A separation pad 11 is located at a position facing the paper feed roller 4, and a separating pad 11 is located on both sides thereof (at a position not facing the paper feed roller 14). P is a sheet material, 22 is an intermediate plate serving as a loading section on which the sheet material P is stacked, and 23 is a spring for pressing the sheet material P on the intermediate plate 22 against the paper feed roller 14.

The relationship between the separation butt 11 and the separation auxiliary pad 12 is as shown in FIG. The upper surface 12a of is higher (partially protrudes toward the paper feed roller 14 side).

When looking at this in cross sections OA, OB, and QC, Figure 3 (a),
The shapes are shown in (b) and (c).

The frictional force between the paper feed roller 14 and the sheet material is F, and the separation pad 1 is
If the frictional force of 71' P between 1 and sheet is H1, the frictional force of separation auxiliary pad 12 sheet material P is ■, and the frictional force between sheets P is G, then F>HlI>G, and H and I are It doesn't matter which one is bigger.

In FIG. 4, when a start key (not shown) is pressed, the paper feed roller 14 rotates and feeds the uppermost sheet material P1 that is in contact with the paper feed roller 14.

At this time, the subsequent sheets P2 to Pi also try to move, but due to the relationship between the frictional forces F, G, and H, as shown in FIG. It stops at the nip part N in 11.

However, if the frictional force G between the sheet materials 2 is larger than usual due to the influence of static electricity, etc., the next sheet material P
2 tries to get over the nip part N.

At this time, as shown in FIG. 6 (FIG. 3 (C) in the sectional view), the sheet material P2 is attached to the separation auxiliary bat 12 at a position where the auxiliary separation pad 12 protrudes from the upper surface of the separation pad 11. Contact and stop.

In other words, it becomes possible to separate the parts that were conventionally separated near the nip part N or even beyond the nip part N.

The above is a description of one embodiment of the sheet material batch feeding device according to the present invention, but the present invention is not limited to this embodiment.

For example, although the surface of the dividing auxiliary vat 12 is a straight line, it may be a curved surface that runs along the paper feed roller 14. However, it is not necessary to line up exactly with the paper feed roller 14. In FIG. 10, 31 is a separation pad having a curved surface R;
2 is a separation auxiliary noppet. 33 is a stand.

In addition, separation pad 11.31 and separation auxiliary bat 12.3
The materials of 2 may be the same or different.

In addition, the separation auxiliary pads F11.31 were provided on both sides of the separation Novet, but as shown in Fig. 11, the auxiliary pads 4
2 may be located at the center of the separation bat 41 and at both sites, or the effect can be obtained even if it is located only at the center.

Further, the paper feed roller 44 has a shape in which the center portion is cut off.

In addition, in this embodiment, nine rollers were used as the paper feed rollers, but this is also effective in a paper feed system in which a half-moon-shaped paper feed roller 54 and auxiliary rollers 55 are provided on both sides of the paper feed roller 54, as shown in FIG. It is. In this case, the auxiliary roller 55 is provided at a position facing the separation auxiliary vat 12. The outer diameter of the auxiliary roller 55 is smaller than that of the paper feed roller 54, and creates a gap m1 between the auxiliary bat 12 and the auxiliary bat 12 during paper feeding.

According to the configuration of the embodiment of the present invention, separation auxiliary butts are provided at both sites of the swinging bat, so that more opportunities can be taken to separate the fourth sheet.
This makes it possible to reliably prevent double feeding.

Furthermore, by increasing the height of the separation butt between the paper feed port and the area where there is no hole, the positional accuracy of the paper feed roller and the separation auxiliary rose 1- does not have to be so poor.

Furthermore, since the upper surface of the artificial side of the separation auxiliary bat is set at the same level or lower than the upper surface of the separation bat, when the sear 1-44 enters the separation pad portion, the entrance of the separation auxiliary bat or the sheet material is not obstructed.

In addition, by increasing the friction coefficient of the separation auxiliary pad, the separation auxiliary bat can move sufficiently even when the separation pad and paper feed roller are in contact with each other, thereby extending the life of the separation pad and paper feed roller. It was possible to extend it.

[Effect of the invention] Sheet material I according to the invention! Since the II feeding device has the above-described configuration, it has the effect of preventing double feeding of sheet materials.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the separation pad according to the present invention, FIG. 2 is a front view showing the relationship between the paper feed roller and the swing pad, and FIGS. 3(a), (b), and (c) are Similarly, cross-sectional view, No. 4
6 to 6 are front views illustrating the separation and feeding state of sheet materials, FIGS. 7 to 9 are perspective views showing other different embodiments, and FIGS. 10 and 11 are conventional FIG. 12 is a front view illustrating the partial feeding state of the sheet material, and FIG. 12 is a perspective view of the conventional example. 11.31.41--separation pad, 12.32.42-m-separation auxiliary bat, 14.44.
54--One paper feed roller.

Claims (1)

[Claims] (1) A sheet material separation and feeding device that separates and feeds sheet materials loaded on a loading section one by one, comprising: a rotating member that feeds the sheet materials; and a rotating member provided opposite to the rotating member; A sheet material separation and feeding device comprising: a friction member that frictionally separates sheet materials; and an auxiliary friction member provided at a position not facing the rotating member and partially protruding from the friction member toward the rotating member.