JPH04122543U - Document feeder in facsimile - Google Patents

Abstract

(57) [Summary] [Purpose] When feeding a document in a facsimile machine, the feed roller and the paper guide that presses against the feed roller and nips the document are in uniform contact with the entire width of the feed roller on the contact surface with the feed roller, and the document is To obtain a paper feeding device in which paper does not skew. [Structure] Fluororesin 8 is coated on the feed roller contact surface of a plate-shaped paper guide 3 having a curved surface approximately equal to the peripheral surface of the feed roller 2, and coated on the back surface of the paper guide 3 at approximately equal intervals over its entire width. A plurality of springs 6 are arranged to press the paper guide 3 against the feed roller 2.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention reads the transmitted original placed on the document table one by one in a facsimile machine. The present invention relates to a document feeding device for feeding a document to a storage section.

0002

[Conventional technology]

A feed roller having a circumferential surface with a large friction coefficient at the tip of the document table and the feed roller. A paper guide made of stainless steel plate is attached to the circumferential surface of the document plate. A facsimile machine that captures original documents one by one and feeds them into the reading section. In a paper feeding device, the paper guide is conventionally a paper guide that operates at one point in its central portion. Since it was being pushed in the direction of the feed roller by the pulling, it It was difficult to press the paper guide uniformly and with an appropriate force. So This may cause the document to be fed diagonally or place an excessive load on the feed roller. Something happened. If the paper feeder changes the direction of the document by 180 degrees, use the paper guide. Since the contact area between the feed roller and the feed roller is wide, the above-mentioned problems are especially noticeable. Met.

0003

[Problem that the idea aims to solve]

This invention is a feed roller of a facsimile document feeder. The contact pressure between the roller and the paper guide that comes into contact with it extends over the entire width of the feed roller. It is difficult to keep the feed constant, and the document being fed may be fed diagonally, and the feed roller may be overloaded. A manuscript that solves the problem of heavy loads and can be expected to operate smoothly and stably. The purpose is to provide a paper feeding device.

0004

[Means to solve the problem]

A feed roller has a circumferential surface with a large friction coefficient and pressure is applied to the circumferential surface of the feed roller. In a facsimile paper feeder that consists of a plate-shaped paper guide that is in contact with the A fluororesin coating is applied to the feed roller contact surface of the paper guide. Multiple springs are placed on the back of the guide at approximately equal intervals across its entire width. The paper guide was brought into pressure contact with the feed roller.

[0005]

[Effect]

The document feeding device of the present invention uses a plurality of springs arranged at equal intervals. A paper guide with a curved surface similar to the curved surface of the feed roller is placed on the back of the paper guide. Multiple springs installed on the surface apply uniform pressure across the entire width of the feed roller. let This increases the load on the feed roller circumferential surface, but The feed roller contact surface of the par guide is coated with fluororesin. By reducing the coefficient of friction between the feed roller and the document, This prevents an increase in load and facilitates paper feeding.

[0006]

【Example】

An example of implementation of the present invention will be described below with reference to the drawings.

[0007] The feed roller 2 placed at the tip of the document table 1 has a circumferential surface with a large coefficient of friction. It is a normal one made of rubber. The paper guide 3 is made of stainless steel plate, and the end It is rotatably supported by a shaft 5 in the section 4 . Back side 3 of paper guide 3 In the illustrated example, there are three leaf springs 6 arranged at equal intervals on the a side, and their tips contacts the back surface 3a of the paper guide 3 and moves the paper guide 3 to the feed roller 2. It is biased in the direction. Paper guide 3 with springs 6 installed at the three locations above Figure 2 shows the load distribution of each spring 6, 6, 6. The load distribution is shown by a thin line, and the integrated load distribution is shown by a thick line. This results in How should you choose the installation spacing of each spring 6, 6,... to ensure that the springs 6, 6, ... are installed over the entire length of the roll? This will tell you whether you can obtain a nearly uniform load. This allows the page The curved portion 7 near the tip of the par guide 3 is brought into constant pressure contact with the feed roller 2. In addition, the pressure contact force is approximately equal over the entire width of the paper guide 3. Ru. Then, the entire surface of the paper guide 3 that comes into contact with the feed roller 2 is It is coated with fluororesin 8. In addition, the stainless steel plate of Paper Guide 3 is There is a slight difference at the boundary 9 between the area coated with fluororesin 8 and the area not coated. It is bent like a crab step, and the fluororesin coating layer is bent to form a flat surface. A step is formed on the surface of the feed roller 2 side to prevent the document from being caught.

[0008] The pressure contact force of the paper guide 3 is uniform over the entire width of the paper guide 3 as described above. Due to this, when feeding with this paper feeder, document 10 is placed in the paper guide. The feed roller 2 moves while being held between the feed roller 3 and the feed roller 2 with uniform pressure, and moves diagonally. It is sent to the reading section without any problems. Also, the pedals biased by the plurality of leaf springs 6 With the super guide 3, the peripheral surface of the feed roller 2 is fitted with a conventional single leaf spring. Although a larger load is applied than in the case of The surface is coated with fluororesin 8 and has a low coefficient of friction. No excessive load is applied to the feed roller 2.

[0009]

[Effect of the idea]

As mentioned above, this invention uses fluororesin on the feed roller contact surface of the paper guide. The coating is applied to the back of the paper guide, and the coating is applied to the back side of the paper guide at approximately equal intervals across its entire width. Since several springs were arranged to press the paper guide against the feed roller, The document is reliably fed to the reading section without putting excessive load on the feed roller. It is possible to easily feed paper with a 180 degree change in direction.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a diagram showing the pressure distribution of nip pressure between a feed roller and a paper guide.

FIG. 3 is a partial cross-sectional view of the paper guide.

[Explanation of symbols]

1 Document table 2 Feed roller 3 Paper guide 6 Leaf spring 8 Fluororesin

Claims (1)

[Scope of utility model registration request] Claim 1: In a facsimile paper feeding device consisting of a feed roller having a peripheral surface with a large coefficient of friction and a plate-shaped paper guide that is pressed against the peripheral surface of the feed roller, the contact surface of the paper guide with the feed roller is coated with fluororesin. A document feeding device for a facsimile machine, which is coated and has a plurality of springs arranged at approximately equal intervals over its entire width on the back surface of the paper guide, and these springs press the paper guide into contact with a feed roller.