JPH0733264A - Paper feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] With a simple structure, it is possible to prevent the tip of the paper from slipping into the separation claw, to minimize paper jams, skews, and folds in the paper, and to save space The purpose is to obtain a paper machine. A sheet feeding device having a rotatable stacking plate for stacking sheets and a separation claw for separating the stacked sheets one by one in a paper storage container. The stacking plate is provided with a projecting portion that projects downstream of the contact portion from the sheet conveying direction. Furthermore, along the moving direction of the stacking plate, a groove for moving the protruding portion is provided at a position facing the protruding portion of the sheet storage container.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a sheet feeding device for separating and feeding each sheet. More specifically, the present invention relates to a sheet feeding device of an image forming apparatus such as a printer, a copying machine, and a facsimile.

[0002]

2. Description of the Related Art Conventionally, a stacking plate is rotatably provided in a sheet feeding container, and when the sheets stacked on the stacking plate are fed by a sheet feeding roller, such sheets are fed one by one. 2. Description of the Related Art A sheet feeding device having a separating claw for separating is known.

[0003]

However, in such a conventional sheet feeding device, as shown in FIG. 5, when the number of sheets decreases and the stacking plate rises, a gap is formed between the separating claw and the stacking plate. This caused the paper to slip into the gap, causing a paper jam, skew, and fold of the paper. In addition, recycled paper has come to be diversified due to problems such as environmental destruction, but the quality of the paper is unavoidable compared to new paper, and the above-mentioned problems are more serious problems than ever before. .

The present invention has been made in view of the above points, and its purpose is to provide a simple structure.
An object of the present invention is to prevent the leading edge of the paper from slipping into the separation claw portion, to minimize paper jam, skew, and edge breakage of the paper, and to provide a space-saving paper feeding device.

[0005]

In order to achieve such an object, the invention of the present application comprises a rotatable stacking plate for stacking sheets and a separation claw for separating the stacked sheets one by one. In the paper feeding device provided in the container, the stacking plate is provided with a projecting portion projecting toward the downstream side of the sheet transport from the sheet tip contact portion of the separation claw. Furthermore, along the moving direction of the stacking plate, a groove for moving the protruding portion is provided at a position facing the protruding portion of the sheet storage container.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a sheet feeding device according to the present invention. FIG. 2 is a perspective view of the sheet feeding device according to the present invention.

The paper storage container 1 is attachable to and detachable from a predetermined position 2 of the image forming apparatus which is the main body. Paper storage container 1
A sheet stacking base 3 is provided on the sheet stacker, and sheets are stacked on the stacking plate. One end of the sheet stacking plate 3 is rotatably supported, and a spring 4 urges the sheet stacking plate 3 upward near the other end.

The uppermost sheet among the sheets stacked on the sheet stacking table is given a conveying force by the rotation of the sheet feeding roller 7, and is separated by the separating claw 6 from the sheet bundle one by one. A friction member 13 for preventing double feeding is attached to a position of the sheet stacking plate 3 facing the sheet feeding roller. The separated paper is fed along the turn guide 8 to the first transport roll.
Via the roller pair 9 and the second carrier roller pair 10
It is transported to the la pair 11.

The separation claws are also called corner claws, and are arranged at both corners at the leading end of the stacked sheets in the feeding direction. The separation claw 6 is rotatably supported with respect to the side fence 5 that regulates a sheet edge orthogonal to the sheet feeding direction,
When the paper is stored, the two corner claws are rotated upward to facilitate the work of storing the paper.

FIG. 3 is a perspective view of a main part of the paper feeding device according to the present invention. FIG. 4 is a diagram showing a positional relationship between the separation claw and the leading end of the sheet stacking table.

A plurality of protrusions 12 are provided at the tip of the sheet stacking table 3. The protruding portion is integrally provided on the metal sheet stacking plate. As is apparent from FIG. 4, the tip position of the protruding portion 12 extends to the downstream side of the sheet feeding direction with respect to the sheet tip contact portion of the separation claw 6.

In order to prevent the sheet stacking amount from decreasing and the gap between the sheet tip abutting portion of the separating claw 6 and the sheet stacking plate to increase, and to prevent the sheet from slipping into the gap, at least the sheet is stacked. At the rotation position of the sheet stacking plate when the remaining amount becomes one, the tip position of the projecting portion is substantially the same as the sheet tip contact position of the separation claw, or is located downstream in the sheet feeding direction. There must be. It is necessary to appropriately adjust the amount of protrusion of the protrusion according to the storage capacity of the paper storage container.

Grooves 14 are provided corresponding to the plurality of projecting portions of the storage container 1 respectively. The groove 14 secures a space necessary for the protrusion to move, and the groove width is slightly larger than the width of the protrusion and extends in the vertical direction as apparent from FIG. ing. The groove may be formed such that the groove bottom is curved upward and downward so as to correspond to the movement locus of the tip of the protrusion. As a result, it is not necessary to increase the size of the entire storage container, and the size can be reduced.

[0015]

As described above, according to the present invention,
With a simple configuration, it is possible to obtain a small-sized image forming apparatus with a small amount of paper jam, skew, and edge bending of the paper.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a sheet feeding device according to the present invention.

FIG. 2 is a perspective view of a sheet feeding device according to the present invention.

FIG. 3 is a perspective view of a main part of the paper feeding device according to the present invention.

FIG. 4 is a diagram showing a positional relationship between a separation claw and a leading end of a sheet stacking table.

FIG. 5 is an explanatory view of a main part of a conventional paper feeding device.

[Explanation of symbols]

 1 Paper Storage Container 3 Paper Stacking Plate 5 Side Fence 6 Separation Claw 12 Projection Part 13 Friction Member 14 Groove 15 Paper Tip Contact Position

Claims (2)

[Claims] 1. A sheet feeding device having a rotatable stacking plate for stacking sheets and a separating claw for separating the stacked sheets one by one in a sheet storage container, wherein the sheet of the separating claws is provided. A sheet feeding device, characterized in that the stacking plate is provided with a projecting portion projecting to the downstream side of the sheet conveyance from the tip abutting portion. 2. The sheet feeding device according to claim 1, wherein a groove for moving the protrusion according to the rotation of the stacking plate is provided at a position facing the protrusion of the sheet storage container. apparatus.