Fuji Xerox Co., Ltd.

Dow Corning Toray Silicone Company Limited

Kinjo Rubber Co., Ltd.

Shigeo Kawachi

Ichiro Tomikawa

Katsuyuki Fujii

Junichi Yoshida

Katsuhide Ogawa

Mitsuhide Soga

Kazuo Higuchi

Shinichi Sumimura

Eiichi Nagatsuka

Masaru Kamei

Tooru Kataoka

Shinichi Ogawa

Takehiko Noda

An elastic jointing member 22 with an umbrella-like portion with an opening and a flat part is provided in a jointing portion between a recording head 21 and an ink tank 1. When the ink tank 1 is attached to the recording head 21, the umbrella-like portion of the elastic jointing member 22 is pressed against the ink tank and elastically deformed inward. As a result, an ink passage is formed which is airtightly sealed. In the process of pressing the umbrella-like portion against the ink tank, the umbrella-like portion comes in contact with the flat part, to thereby prevent air from staying in the ink passage. Protrusions or grooves may be provided between the umbrella-like portion and the flat part. With the protrusions or the groove, the umbrella-like portion is not glued to the flat part.

Ink jet recording unit

The present invention provides a paper feed roll adapted for office machines which exhibits a high friction coefficient suitable for the conveyance of copying paper, printing paper, original, etc. and less abrasion. A process for the preparation of such a paper feed roll is also provided. Further, a silicone rubber composition suitable for the foregoing paper feed roll having an excellent formability to roll is provided. In particular, a novel silicone rubber-coated paper feed roll is provided, which is prepared from a silica-containing silicone rubber composition. The silicone rubber obtained by curing the silica-containing silicone rubber composition and composes the paper feed roll has an impact resilience of not less than 80% after curing as determined by JIS K6301, a permanent compression set of not more than 4% under a condition of 25% compression at 70.degree. C. for 22 hours and a 100% modulus of from 0.3 to 1.0 MPa. A novel silica-containing silicone rubber composition for use in a paper feed roll is also provided, which contains a diorganosiloxane represented by the following general formula as a silica treatment: ##STR1##

Paper feed roll, process for the preparation thereof and silicone rubber

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Yao, Japan

Shigeo Kawachi