JPS6175750A - Automatic original text sheet supplying device - Google Patents

Abstract

PURPOSE:To enhance durability and reduce frictional noise while maintaining excellency in separating performance by making the separator rubber, which is to separate original text sheets one after another in co-operation with a separator roller, of polyurethane rubber, and by providing its surface with unevenness. CONSTITUTION:This sheet feeding device includes a payoff roll 1 to transport original text sheets, a separator roller 2 and separator rubber 3 to serve in co-operation for separating the paid-off originals one for another, and a bracket 4 and a spring 4' to work in cooperation for putting the separator rubber 3 in pressure contact with the separator roller 2. Here the separator roller 3 in formed from polyurethane, and its surface is provided with unevenness. This will reduce its contact area with the separator roller 2 to lead to decrease of the frictional noise lokely to be generated at the time of separation. Further, urethane rubber is excellent in durability as well as has a great coefficient of friction, so that excellent separating performance can be maintained despite unevenness on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an automatic document feeder for copying machines, facsimile machines, and the like.

■Prior Art Conventionally, the separation mechanism used in document feeders has generally used a combination of chloroprene rubber for the separation roller and carbon-containing natural rubber for the separation rubber. However, the color of the carbon contained in the 1-separation rubber blackens the surface of the white reading roller of the 1-magnification sensor, which interferes with reading. has the disadvantage that wear becomes noticeable.

■ Purpose The present invention is intended to solve the above problems.

Despite its simplified mechanism, it has excellent separation and paper feeding performance,
Furthermore, it is an object of the present invention to realize an automatic document feeder for copying machines, facsimile machines, etc., which can improve reliability and durability.

■Structure For example, in a device that uses a full-size sensor for reading, a white roller (silicon, etc.) is used for conveyance (reading). Therefore, if a colored roller containing carbon or the like (gloloprene, natural rubber, etc.) is used for the minute 111 com, the roller surface may be contaminated and reading may be hindered. However, white rubber has poor strength and is easily abraded.

In that respect, urethane rubber has excellent strength and durability, but
When used in separating rubber, it generates noise when separated due to its coefficient of friction. The countermeasures are described below.

FIG. 1 is an embodiment diagram showing the configuration of the main parts of the device of the present invention, in which 1 is a feeding roller for feeding set documents to a separation roller, 2 and 3 are feed rollers for conveying set documents to a separation roller, Separation roller and separation rubber for separating the original into one sheet, 4
are a bracket and spring for pressing the separation rubber against the separation roller.

FIG. 2 is a perspective view of an embodiment showing the structure of the separation roller and separation rubber in the present invention, in which the surface of the separation rubber 3 made of polyurethane is roughened.

By making the surface uneven, the contact area with the separation roller 2 is reduced, and it is possible to reduce the friction noise caused by the paper during one separation.

Furthermore, since urethane rubber is inherently durable and has a large coefficient of friction, even if one surface is made uneven, the separation performance is excellent.

FIG. 3 is a perspective view of another embodiment showing the structure of the separation roller and separation rubber in the present invention, and is an example in which polyurethane rubber and other rubber are formed into a layered sandwich structure.

The sand inch structure is easier to process than one where the surface is uneven, and since the surface is flat, wrinkles at the tip can be prevented.

In this case as well, by sandwiching the polyurethane rubber, the durability, friction coefficient, etc. are the same as in the case of the uneven state.

■Effects As explained above, the present invention uses polyurethane rubber in layers to improve the durability of the separation rubber without impairing separation performance, and further reduces friction noise. be. Furthermore, even when a white roller is used for reading, there is almost no concern that the surface will be contaminated.

[Brief explanation of the drawing]

Fig. 1 is an embodiment diagram showing the configuration of the main parts of the present invention device, Fig. 2 is a perspective view of an embodiment showing the composition of the separation roller and separation rubber in the present invention, and Fig. 3 is a separation diagram in the present invention. FIG. 7 is a perspective view of another embodiment showing the configuration of a roller and a separating rubber. 1...Feeding roller, 2...Separation roller, 3...
・Separation rubber, 4...Pressure bracket and spring. Patent applicant Ricoh Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] Equipped with an auxiliary mechanism for feeding the original to the separation roller, a separation roller and separation rubber for separating the fed original into one sheet, and a pressure mechanism for pressing the separation rubber against the separation roller. An automatic document feeder characterized by using polyurethane rubber for the separating rubber and having a stepped rubber surface for the purpose of reducing friction noise and controlling the coefficient of friction.