JPH03172246A - Paper feeder for office equipment - Google Patents

Abstract

PURPOSE:To prevent a plurality of sheets of paper form from being placed in a paper separating part between a paper feed roller and a separating surface by forming friction surface of large coefficient of friction in a part of a paper guide opposed to the paper feed roller of a paper form guide. CONSTITUTION:In the case of inserting paper forms 16, laminated in a large number of sheets, along the guide surface 12 of a paper guide 13, since a point end of the paper form 16 is brought into contact with a separating surface 11 with an obtuse angle formed for the guide surface 12, the paper form 16, even when its press-in force is strongly given, is stopped in that position. That is, the separating surface 11 acts as a stopper for the press-in of the paper form 16. In the paper form 16 thus pressed in, since the paper form in the uppermost surface is brought into contact with the peripheral surface of a paper feed roller 15, when it is started to rotate, the paper form is fed out along a direction of rotation of the roller 15. Now even when two sheets of the paper forms 16 are placed between the paper feed roller 15 and a friction surface 18, the paper form 16, brought into contact with the friction surface 18, is prevented from being fed out because friction force between the paper form 16 and the friction surface 18 is larger than friction force between the paper forms.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is used in office equipment such as facsimile machines and copying machines to separate and feed sheets one by one from a large number of stacked sheets of paper that have been supplied in advance. The present invention relates to a paper feeding device for office equipment.

2. Description of the Related Art An example of a conventional paper feeding device of this type will be described with reference to FIG. First, a paper table 2 for holding a large number of stacked sheets of paper l is provided, and a paper feed roller 3 is disposed at the end of this paper table 2. Below this paper feed roller 3, a pressing piece 5 that holds a separating piece 4 formed of a material with a large coefficient of friction such as rubber is rotatably supported by a support shaft 6, and this pressing piece 5 is supported by a pressing spring 7. is biased upward by.

In such a configuration, the tip of the paper 1 inserted onto the paper table 2 is pushed into the wedge-shaped portion formed by the paper feed roller 3 and the separation piece 4, and the paper 1 is pushed in the direction of arrow A of the paper feed roller 3. As the paper rotates, sheets of paper 1 at the top are separated and fed one by one.

Problems to be Solved by the Invention Since the separating piece 4 is pressed against the paper feed roller 3 by a pressing spring 7 via a pressing piece 5, when the stacked sheets 1 are pushed strongly, the separating piece 4 is separated from the paper feed roller 3, and as a result, there is a problem that a plurality of sheets of paper 1 are sent out in a bundle.

In order to solve this phenomenon, there are automatic sheet feeding devices with complicated shapes, but these have complicated structures and a large number of parts, and it is difficult to make a simple sheet feeding device.

Means for Solving the Problem Forming a paper guide having a wide separation surface facing the paper feed roller that is narrower than the width of the paper, and a guide surface forming an obtuse angle with the separation surface and holding the inserted paper, A friction surface with a large friction coefficient was formed on the paper guide at a portion facing the paper feed roller.

The guide surface and separation surface of the working paper guide form an obtuse angle with each other, so even if the stacked paper is strongly pushed along the guide surface, the leading edge of the paper will come into contact with the separation surface and stop.
The separation surface acts as a stopper for pushing, thereby
The structure is such that a plurality of sheets of paper do not enter the paper separation section between the paper feed roller and the separation surface, and reliable paper separation can be performed with a simple structure.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 and 2. First, a paper guide 13 is provided which has a separating surface 11 making an angle e with respect to the horizontal plane and a guide surface 12 making an angle e with the horizontal plane. This paper guide 13
The separation surface 11 and the guide surface 12 form an obtuse angle with each other.

On the other hand, a paper feed roller 15 is provided opposite to the separation surface 11 of the paper guide 13 and held by a support shaft 14 . The length of the paper feed roller 15 in the axial direction is smaller than the width dimension of the paper 16 to be fed.

A separation piece 17 made of a material with a high friction coefficient, such as thin rubber, is attached to a portion of the paper guide 13 facing the paper feed roller 15 to form a friction surface 18. The distance between this friction surface 18 and the outer peripheral surface of the paper feed roller 15 is set to match the thickness of the paper 16.

Further, a guide plate 19 is formed on the paper guide 13 to prevent the paper 16 from floating up, and the paper feed roller 15 is passed through the guide plate 19 so as to face the separating surface 11. An opening is formed to allow for.

In such a configuration, when a large number of stacked sheets of paper 16 are inserted along the guide surface 12 of the paper guide 13, the leading edge of the paper 16 will not touch the guide surface 12 even if the insertion force is strong.
The paper 16 comes into contact with the separation surface 11 forming an obtuse angle with the paper 16, and therefore, even if the pushing force of the paper 16 is strong, the paper 16 stops at that position. That is, the separating surface 11 acts as a stopper against the pushing of the paper 16.

Since the uppermost surface of the paper 12 inserted in this manner is in contact with the outer peripheral surface of the paper feed roller 15, when the paper feed roller 15 starts rotating, it is sent out along the direction of rotation. At this time, even if two sheets of paper 16 enter between the friction surface 18 of the paper feed roller 15 and the friction surface 18,
The paper 16 that is in contact with the paper 16 is not sent out because the frictional force between it and the friction surface 18 is greater than the frictional force between the sheets, and only - sheets of paper 16 are reliably separated and sent out. .

In the above embodiment, the friction surface 18 is separated by the separation piece 17.
Although the explanation has been given on the surface formed by pasting the separation surface 11, in practice, it is possible to obtain the friction surface 18 with a large friction coefficient by increasing the surface roughness of the separation surface 11 or by performing a surface treatment with a large frictional force. It is possible.

Effects of the Invention As described above, the present invention provides a paper guide having a wide separation surface facing a paper feed roller having a width narrower than the paper width, and a guide surface forming an obtuse angle with the separation surface and holding the inserted paper. , and a friction surface with a large friction coefficient is formed on the part of the paper guide facing the paper feed roller, so that the guide surface and separation surface of the paper guide form an obtuse angle with each other, so that the stacked Even if the paper is strongly pushed along the guide surface, the leading edge of the paper will come into contact with the separation surface and stop, and the separation surface will act as a stopper for pushing. This has the effect that a sheet of paper does not get stuck and that reliable paper separation can be performed with a simple structure.

DESCRIPTION OF SYMBOLS 11... Separation surface, 12... Guide surface, 13... Paper guide, 15... Paper feed roller, 16... Paper, 1
8...Friction surface application person Tokyo Electric Co., Ltd.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view showing an embodiment of the present invention, FIG. 2 is a perspective view with the guide plate omitted, and FIG. 3 is a side view showing an example of the prior art. 1” figure

Claims (1)

[Claims] A paper guide is formed that has a wide separation surface that faces the paper feed roller and has a width narrower than the paper width, and a guide surface that forms an obtuse angle with this separation surface and holds the inserted paper, and the paper guide of this paper guide A paper feed device for office equipment, characterized in that a friction surface with a large friction coefficient is formed on a portion facing a roller.