JPS6357446A - Paper feed device - Google Patents

Abstract

PURPOSE:To make it possible to surely feed a sheet of paper, by providing a such an arrangement that when a sheet of paper is inserted between a guide member and a paper feed member, the guide member is moved in the direction reverse to the direction of flow of the paper sheet. CONSTITUTION:A paper sheet P and another paper sheet fed together with the paper sheet P are led by a conveying guide 15 and reaches between a paper feed roller 16 and a guide member 17. A plurality paper sheets below the paper sheet P abut against a chamfered part in the forward end section of the guide member 17, and are therefore prevented from being fed together with the topmost paper sheet P. However some of them are fed together with the topmost paper sheet P, and when they are held between the feed roller 16 and a separating piece 20, the latter makes contact with the lower paper sheets. Therefore, the recovery force of a tension coil spring 21 moves the guide member 17 in the direction reverse to the direction of flow of the paper sheet P, overcoming the friction force between the topmost paper sheet P and the lower paper sheet. Due to the movement of this guide member 17 the lower paper sheets are separated from the topmost paper sheet P, and are pushed back toward a tray 11.

Description

Detailed Description of the Invention (a) Industrial Application Field This invention relates to a paper feeding device that separates one sheet from a stack of sheet materials (hereinafter referred to as paper pieces) and feeds it to a subsequent process. Regarding.

(B) Prior Art A conventional paper feeding device of this type is shown in FIGS. 5 to 7.

A pickup roller 2 is placed above the stack of paper pieces B loaded on the tray 1.
is positioned, and by the rotation of the calling roller 2, the topmost piece of paper P on the last day of the paper is pushed out together with an appropriate number of pieces of paper. The number of sheets to be pushed varies depending on the gap between the pieces of paper. A pair of transport guides 3 are provided at the front end of the tray 1 in the flow direction of the paper pieces P, and the front end of the transport guide 3 comes into contact with the paper feed roller 5 and the lower end surface of the paper feed roller 5. It faces the separation piece 6 provided at the top.

The separation piece 6 is attached to a guide member 7, and a coil spring 9 is stretched between the guide member 7 and a frame (not shown), and the elastic force of the coil spring 9 causes the separation piece to separate from the paper feed roller 5. It has a structure in which the contact pressure with 6 can be adjusted. Then, among the appropriate number of pieces of paper pushed by the calling roller 2, pieces of paper other than the topmost piece of paper P are
The paper piece P is separated from the paper pieces below it by the separating piece 6, and then sent by the paper feed roller 5 and supplied to the next process.

1 Problems to be Solved by the Invention In the conventional paper feeding device described above, the paper pieces P are separated from the appropriate number of paper pieces pushed by the pick-up roller 2, and the paper pieces P are separated from the appropriate number of paper pieces that are sent as appropriate. a guide member 7 having a paper feed roller 5 and a separation piece 6 for feeding the paper as appropriate;
It was very difficult to adjust the positional relationship. That is, if the paper feed roller 5 is located near the tip of the guide member 7 without contacting the separation piece 6 as shown in FIG. 6, the paper piece P and other paper pieces are not reliably separated. Since the paper pieces P are inserted between the paper feed roller 5 and the guide member 7, there is a risk that the pieces of paper P may be fed in duplicate. In addition, as shown in FIG. 7, when the paper feed roller 5 is far away from the guide member 7 and comes into contact with many of the separating pieces 6, the leading edge of the paper piece P separated from an appropriate number of pieces of paper is on the guide member 7 or separated. There is a risk that the piece of paper P will come into contact with the piece 6 and be bent without being inserted into the horizontal throat formed by the paper feed roller 5 and the separation piece 6, resulting in non-feeding. be.

In order to feed the pieces of paper P appropriately, the guide member 7 and the separating piece 6 are required.
It is desirable that the paper feed roller 5 be positioned near the boundary between the paper feed roller 5 and the separation piece 6, in contact with the separation piece 6; These have a short lifespan due to wear and tear. especially,
This is especially true if the piece of paper P is thin paper. Furthermore, if a large number of pieces of paper P are fed by mistake, there is a problem of double feeding.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a paper feeding device that can reliably feed a piece of paper.

(f) Means for Solving the Problem In order to achieve the above object, the paper feeding device according to the present invention provides a paper feeding device that circulates and moves paper pieces by frictional force with the paper pieces and feeds the pieces of paper to the next process. a paper member, a guide member that is in contact with the paper feed member and is capable of supplying paper pieces to the paper feed member and is capable of reciprocating along the flow direction of the paper pieces; The separating piece has a coefficient of friction smaller than that of the feeding member, and the guide member is always urged by the guide member to move in a direction opposite to the flow direction of the paper pieces, and resists the frictional force between the separating piece and the paper feeding member. It is characterized by comprising a biasing means that cannot move the guide member.

(E) When the working paper piece is not between the paper feeding member and the guide member, the guide member resists the biasing means by the paper feeding member and stops with the separation piece boundary and the paper feeding member in contact with each other. ing. If a piece of paper is inserted between the paper feed member and the guide member,
The biasing means moves the guide member in a direction opposite to the flow direction of the paper strips.

By this movement, paper pieces other than the one paper piece to be supplied to the next process are pushed back.

Embodiment Hereinafter, the paper feeding device according to the present invention will be specifically explained based on the first embodiment shown in FIGS. 1 to 3.

A large number of stacked paper sheets B are placed on a tray 11, and above this tray 11 a calling roller 12 is placed.
However, the paper strip bundle B is also provided so that its peripheral surface is in contact with the surface of the uppermost paper strip P. The feed roller 12 is rotatably supported by a support arm 13, one end of which is rotatably supported by a rotation shaft of a paper feed roller, which will be described later. It is provided so as to be rotatable about the rotation axis of the roller.

Near the tip of the tray 11 on the front side in the flow direction of the paper pieces P,
A pair of conveyance guides 15 combined in a substantially V-shape is provided, and the width of the conveyance guides 15 is narrow on the front side in the flow direction of the paper piece P.

Near the tip of the narrow side of the conveyance guide 15, that is, on the downstream side of the flow of the upper piece P, above the flow area of the paper piece P, a paper feed roller 16 as a paper feed member is rotatable with respect to a frame (not shown). and rotated by a driving means. Further, a guide member 17 for placing a piece of paper P on the lower side of the paper feed row 16 and guiding its movement is provided so as to be slidable with respect to a frame (not shown). Further, the leading end of the guide member 17 facing the conveyance guide 15 is appropriately chamfered, and this chamfer and the outer peripheral surface of the paper feed roller 16 form a horizontal throat.

The guide member 17 is moved by a pin 19 protruding from a frame (not shown) in a long hole 17a formed in the guide member 17.
is guided by being loosely inserted, and is reciprocated along the moving direction (the flow direction of the paper piece P). , a separation piece 20 is attached.The separation piece 20 and paper feed roller The material of the outer circumferential surface of 16 is selected.A tension coil spring 21 as a biasing means is tensioned between the guy 1ζ member 17 and a frame (not shown). The restoring force of the guide member 17 is always urged to move in the opposite direction to the flow direction of the paper piece P. Also, by adjusting the spring constant of the tension coil spring 21, the separation piece 20
When [t] is in contact with the outer peripheral surface of the roller 16, the restoring force of the tension coil spring 21 cannot resist the Ha force between them, thus preventing the guide member 17 from moving. In addition, the paper feeding cola 16 and the guide member 1
When there is a piece of paper P between the tension coil spring 2 and the
The restoring force of 1 is assumed to be able to move the guide member 17 against the frictional force between the separation piece 20 and the paper piece P.

Further, the guide member 17 is pressed against the paper feed roller 16 by the constant force of the tension coil spring 21.

Next, the operation will be explained.

When a copying machine, a printer, etc. equipped with the above-described paper feeding device is operated, the calling roller 2 and the paper feeding roller 16 rotate counterclockwise in FIG.

The rotation of the paper feed roller 16 in the counterclockwise direction causes the support arm 13 to rotate in the same direction, and the rotation of the support arm 13 causes the pickup roller 12 to rotate in the same direction. It will be pressed against the piece of paper P at the top of the page. Therefore, the rotation of the pick-up roller 12 forces the piece of paper P to the right in the figure. At this time, depending on the frictional force between the piece of paper P and the piece of paper below it, several pieces of paper may be sent together along with the piece of paper P. On the other hand, even though the separating piece 20 is in contact with the outer peripheral surface of the paper feed roller 16 and the guide member 17 is receiving the restoring force of the tension coil spring 21,
It does not move due to the frictional force between it and the paper feed roller 16.

When these pieces of paper P and the pieces of paper sent together with the pieces of paper P are guided by the conveyance guide 15 and reach between the paper feed roller 16 and the guide member 17, some of the pieces of paper below the pieces of paper P are guided by the conveyance guide 15. Although the member 17 is prevented from being fed together with the topmost piece of paper P by coming into contact with the chamfered portion at the tip thereof, some sheets are sent to the paper feed roller 16 together with the topmost paper piece P, and the paper feed roller 1
6 and the separation piece 20, the separation piece 2o comes into contact with the paper piece below, and the restoring force of the tension coil spring 21 resists the frictional force between the separation piece 20 and the paper piece. As a result, the guide member 17 moves in the direction opposite to the flow direction of the paper pieces P. By this movement of the guide member 17, the lower piece of paper is separated from the uppermost piece of paper P, and the paper piece is pushed back toward the tray 11.

On the other hand, the topmost piece of paper P in the stack of paper pieces B will be pushed to the next process by the rotation of the paper feed roller 16.

When the paper piece P disappears from between the paper feed roller 16 and the guide member 17, the guide member 17 is moved in the flow direction of the paper piece P by the rotation of the paper feed roller 16, stops at an appropriate position, and then the paper piece P is removed. You will have to wait for it to be sent.

Next, the second embodiment shown in FIG. 4 will be explained.

The paper feeding member is constructed by a driving pulley 22 and a driven pulley 23, with a belt 25 being passed around them.

That is, the outer surface of the belt 25 is in contact with the upper surface of the guide member 26 and the separation piece 20. The calling roller 12 is rotatably supported by the other end of a support arm 13 whose one end is supported by the drive pulley 22. Also, the fourth
As shown in the figure, the guide member 26 is made of a curved plate-like member, and the separation piece 20 is attached to the tip of the guide member 26, and the restoring force of the guide member 26 causes the tip of the guide member 26 to be pressed together with the separation piece 20 against the belt 25. It's about to get hit.

On the other hand, a rod 27 is provided at the base end 26b of the guide member 26.
is loosely inserted so that the movement of the guide member 26 is guided by this rod 27.

In addition, in this embodiment, the downstream side in the flow direction of the paper pieces P of the tray 11 is bent obliquely upward, and a pair of conveyance guides 15 are formed.
It forms one of the two.

When the piece of paper P is located between the belt 25 and the separation piece 20, the restoring force of the tension coil spring 21 causes the guide member 26 to be guided by the rod 27 and move in the opposite direction to the flow direction of the piece of paper P. As a result, the piece of paper below the piece of paper P is pushed back toward the tray 11.

(G) As described in detail, according to the paper feeder according to the present invention, the guide member that guides the paper pieces along the flow direction of the paper pieces is movable, and the paper pieces are moved between the guide member and the paper feed member. Since the guide member moves in the opposite direction to the flow direction of the paper pieces when inserted between the guide member and the guide member, the paper pieces to be fed and the paper pieces attached thereto are reliably separated. Be able to do that. Furthermore, until the piece of paper is inserted between the guide member and the paper feed member, the boundary between the paper feed member and the separation piece is in contact with each other, so that the piece of paper can be securely placed between the paper feed member and the separation piece. It can be inserted, and it is possible to reliably push out a unit number of pieces of paper. Furthermore, the guide member is movable,
Since the guide member and the paper feed member are not always in contact with each other at the same location, the service life can be increased against wear.

In addition, there is no need for a power source such as an electric motor to move the guide member, and the point at which the guide member starts moving can be determined simply by changing the coefficient of friction of the separating piece against the paper feed member and the coefficient of friction against the paper piece. Since no other detecting means or the like is required, the paper feeding device can be provided at low cost and has high practicality.

[Brief explanation of drawings]

Figures 1 to 3 show a first embodiment of the paper feeding device according to the present invention, in which Figure 1 is an overall side view, and Figure 2 shows the paper feeding roller and guide before a piece of paper is inserted. side view of the member;
FIG. 3 is a side view of the paper feed roller and guide member with a piece of paper inserted therein. FIG. 4 shows a second embodiment, and is an overall side view corresponding to FIG. 1. Figures 5 to 7 show conventional paper feeding devices. Figure 5 is an overall side view, Figure 6 is a side view when the paper feed roller is too forward, and Figure 7 is a side view when the paper feed roller is too far forward. It is a side view when it is located in the back. 11. Tray, 12. Calling roller, 13. Support arm, 15. Conveyance guide, 16. Paper feeding roller (paper feeding member), 17.. Guide member, 20 - Separation piece, 21. Tension coil spring (biasing means)
, 22-driving pulley, 23...driven pulley,
25...Belt, 26...Guide member.

Claims (1)

[Claims] (1) A paper feeding member that feeds the sheet material by frictional force with the sheet material, a separation piece made of a material whose friction coefficient with respect to the sheet material is lower than that of the paper feeding member, and the separation piece is fixed and A guide member for guiding the sheet material to the contact portion between the separating piece and the paper feeding member is provided, and the sheet material is separated from the sheet material bundle.
In the sheet feeding device configured to feed the sheet, the guide member is configured to be movable in the flow direction of the sheet material, and the guide member is always urged to move in a direction opposite to the flow direction of the sheet material. A paper feeding device characterized in that a biasing means is installed that does not allow the guide member to move against the frictional force between the separating piece and the paper feeding member.