JP2652562B2 - Rubber member to prevent paper feed double feed - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber member for preventing double feed of paper feed, and more specifically, a rubber plate for preventing double feed of paper in a paper feeder of a copying machine, a facsimile, a printing machine, or the like. Or improvement of rubber rollers and the like.

[Conventional technology]

In a copying machine, a facsimile machine, a printing machine, or the like, a rubber plate for preventing paper feeding and double feeding is provided as shown in FIG.
Alternatively, a member B such as a rubber roller (a rubber plate in the illustrated example) is provided.

The rubber member B for preventing double feed of paper feed has a surface frictional resistance smaller than the surface frictional resistance of the paper feed roller A against the paper C, but is larger than the surface frictional resistance of the papers. When the paper C is fed, only the paper C in contact with the paper feed roller A is fed, and the paper C in contact with the paper feed double feed prevention rubber member B is stopped in place, thereby achieving the purpose of preventing double feed.

As the above-mentioned rubber member B for preventing paper feed and double feed, for example, as disclosed in Japanese Utility Model Application Laid-Open No. Sho 60-12546, the surface of a plate formed of kneadable urethane (millable urethane) is buffed to form a paper. To have an appropriate surface friction resistance, urethane rubber, nitrile butadiene copolymer rubber, as disclosed in JP-B-62-56061,
10 to oil resistant rubber such as fluoro rubber or acrylic rubber
It has been proposed that about 10 to 50% by weight of ~ 80 mesh cork particles be mixed and then exposed to the surface to form a plate having a hardness of JISA 50 to 80 mm to have an appropriate surface friction resistance. .

[Problems of the prior art]

By the way, the former paper feed double feed prevention rubber member has good abrasion resistance in terms of material and is good in durability, but has a tendency that the coefficient of friction tends to be too high. However, it is difficult to sufficiently improve the coefficient of friction, and there is a disadvantage that slippage during feeding of a single sheet is poor even if it is convenient for preventing double feed.

On the other hand, in the latter rubber member for preventing the paper feed double feed, the improvement of the friction coefficient is greatly improved by the cork particles mixed therein, but due to the addition of the cork particles, the rubber member for preventing the paper feed double feed is resistant. There was a drawback that abrasion deteriorated and durability was impaired.

[Problems to be solved by the invention]

The present invention can be molded with a rubber sheet for double feed prevention or a rubber composition usually used for a paper feed roller, and has abrasion resistance and a coefficient of friction suitable for a paper feed double feed prevention rubber member. It is intended to be able to do so.

[Technology that solved the problem]

That is, the rubber member for preventing double feed of paper feed of the present invention is a composition mainly composed of natural rubber or synthetic rubber, and a short fiber having an aspect ratio of 10 or more is 2 to 50 parts per 100 parts of the rubber component.
The short fibers are partly mixed and are exposed to the surface to form a plate or a roll.

[Action]

As the rubber composition used as a main component in the paper feed / double feed prevention rubber member of the present invention, natural rubber, or synthetic rubber such as butadiene rubber, ethylene propylene, or diene terpolymer rubber can be used. Any type of rubber composition can be used as long as it is a rubber composition ordinarily used for ordinary paper feed / double feed prevention rubber plates or rollers.

The short fibers added in the present invention are for reinforcing a molded article formed into a plate or a roller and for improving abrasion resistance and for improving a surface friction resistance described later.

The reason for setting the aspect ratio of the short fibers to 10 or more is that if the ratio is less than 10, the reinforcing effect of the rubber molded article cannot be exhibited, and the aspect ratio is preferably 30 or more.

Further, the addition amount of the short fiber is set to 2 to 50 parts with respect to the rubber component 100, if less than 2 parts can not improve the wear resistance and friction coefficient by short fiber reinforcement, and if more than 50 parts, This is because processing such as mixing becomes impossible, and even if it can be performed, the coefficient of friction is so low that the effect of preventing double feeding cannot be obtained.

 In this range, 10 to 30 parts is a preferable addition amount.

The short fibers mixed with the rubber component are partially exposed on the surface, the friction coefficient of the rubber itself is appropriately reduced by the exposed portions, and the wear resistance is imparted by the fibers in the rubber structure. You.

In the above description, the surface state of the rubber member for preventing paper feed and double feed is important, and therefore, the form of the member such as a plate or a roller is not particularly limited.

〔Example〕

 Hereinafter, embodiments of the present invention will be described.

Example 1 As a rubber composition as a main component, a rubber component shown in Formulation Table 1 was used. To 100 parts of this rubber component, 4 parts of 66 nylon fiber having a thickness of 6 denier and a length of 1 mm were added, and a conventional method was used. After uniform mixing, it is formed into a plate with a thickness of 2 mm, and a part of the fiber 1 is surfaced as shown in Fig. 2 by buffing the surface.
It was exposed from 2A to obtain a rubber plate for preventing paper feed and double feed.

Formulation Table 1 Mercaptan-modified polychloroprene 100 parts Stearic acid 1 part Antioxidant 2 parts Carbon SRF 65 parts Aromatic oil 10 parts Accelerator 0.5 parts Zinc white 5 parts Magnesium oxide 4 parts Example 2 A rubber plate for preventing paper feed and double feed was obtained in the same manner as in Example 1 except that the addition amount was changed to 11 parts.

Example 3 A rubber member for preventing paper feed and double feed was obtained in the same manner as in Example 1 except that the addition amount of 66 nylon fiber in Example 1 was changed to 20 parts.

Comparative Example 1 A paper feed / double feed prevention rubber member having the same shape as that of Example 1 was obtained by using only the rubber component without adding any short fiber in Example 1.

Comparative Example 2 In place of 66 nylon fiber in Example 1, the average particle diameter was 0.2.
A 9 mm cork powder was used, and 20 parts of the cork powder was added to 100 of the rubber component.

Example 4 As a rubber composition as a main component, a rubber component shown in Formulation Table 2 was used, and 100 parts of the rubber component was mixed with a polyamide fiber having a thickness of 1.5 denier and a length of 3 mm (trade name: Teijin Limited, trade name: After adding 25 parts of Conex ") and mixing uniformly, a rubber member for preventing paper feed and double feed was obtained in the same manner as in Example 1.

Formulation Table 2 Sulfur-modified polychloroprene 100 parts Stearic acid 1 part Antioxidant 2 parts Carbon HAF 40 parts Magnesium oxide 4 parts Zinc white 5 parts Example 5 The rubber component shown in Formulation Table 3 was used as the main rubber composition. To 100 parts of this resin, 20 parts of the same nylon 66 short fiber used in Example 1 were added.
In the same manner as in the above, a rubber member for preventing paper feed and double feed was obtained.

Formulation 3 Crosslinkable polyurethane 100 parts Stearic acid 0.5 part Stabilizer 3 parts Carbon FEF 30 parts Plasticizer (DOP) 5 parts Crosslinking agent 3 parts Comparative Example 3 Only the rubber component without any short fibers in Example 5 In the same manner as in Example 5, a paper feed / double feed prevention rubber member was obtained.

Comparative Example 4 Comparative Example 2 was replaced with the nylon 66 short fiber in Example 5.
A paper feed / double feed prevention rubber member was obtained in the same manner as in Example 5 using the cork particles used in the above.

For each of Examples 1 to 5 and Comparative Examples 1 to 4, tests were conducted on the coefficient of friction, the amount of wear, the oil resistance, the hardness, the tensile strength, and the elongation.

In the table, the coefficient of friction is measured by a Haydon 14 type friction tester, the amount of friction is measured based on DIN test conditions, the oil resistance is 70 ° C using No. 3 oil based on JIS K 6301, The swelling amount (ΔV) of the rubber composition after 70 hours was measured.

[Effect] As apparent from the above, the present invention has a friction coefficient lower than that of the feed roller due to partially exposed short fibers, and has a surface frictional resistance greater than the frictional resistance between papers. In other words, only the upper layer paper that is in contact with the paper feed roller is allowed to slide, the lower layer paper is prevented from being sent out due to a frictional resistance greater than the friction coefficient between the papers, and a moderate amount of To enable smooth paper feeding.

In addition, the addition of short fibers can also impart the friction resistance of the rubber plate, which can be adjusted by the amount of short fibers added, so that it can be easily designed for any paper and molded using ordinary rubber. Since it is possible, it has an effect that it can be manufactured at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a paper feed / double feed prevention rubber member according to the present invention, and FIG. 2 is an enlarged sectional view of a main part of the embodiment.

Claims (1)

(57) [Claims] (1) A short fiber having an aspect ratio of 10 or more is added to a composition containing natural rubber or synthetic rubber as a main component.
A rubber member for preventing paper feed and double feed, wherein 2 to 50 parts are mixed with respect to 0 part, and a part of the short fiber is exposed to the surface and formed into a plate shape or a roller shape.