Sumitomo Rubber Industries Limited

Toshiyuki Hirai

Akihiro Mine

Hirokazu Nishimori

Yudai Okuno

Yoshihiro Yamada

Masashi Hamakubo

Toshihiro Tamura

Yasuchika Ito

Masahiro Yoshizato

Hirofumi Konishi

Keishi Yamamoto

Yuichi Sato

There is provided a rubber composition in which an antistatic agent is uniformly dispersed and the rubber composition has antistatic ability, coefficient of friction, and wear resistance. A rubber composition includes 7 parts by mass or more of a polyether/polyolefin block copolymer resin with respect to 100 parts by mass of a rubber component, and the total amount or a part of a rubber component is mixed with a polyether/polyolefin block copolymer resin at a temperature that is equal to or higher than a melting point of the polyether/polyolefin block copolymer resin.

Antistatic rubber composition

A paper feed roller of the present invention comprises a roller bodyintegrally formed of elastic material in a cylindrical shape in which a plurality of protruding linesare disposed on a peripheral surfaceat even intervals, wherein the roller bodyis formed so that crest portionsand trough portionsare continuously provided in a circumferential direction, an opening angle &#x3b8; is equal to or more than 2&#xb0; and is equal to or less than 8&#xb0;, a radial height h of the protruding line is equal to or more than 0.051 mm and is equal to or less than 0.1 mm, and a curvature radius rat a shoulder is equal to or more than 0.55 mm.

Paper feed roller and image forming apparatus with the paper feed roller

The inventive sheet conveying roller includes a plurality of linear projections provided on an outer peripheral surface of a roller body of an elastic material and each having a generally right-angled triangular cross section which includes a hypotenuse edge and an adjoining edge provided on a forward side and on a rearward side, respectively, with respect to a roller body rotation direction, the adjoining edge aligning with a line perpendicular to a center axis of the roller body. The linear projections are rounded with the hypotenuse edges and the adjoining edges thereof connected to each other by curves as seen in section, and provided integrally with the roller body to be equidistantly arranged on the outer peripheral surface of the roller body.

Sheet conveying roller and image forming apparatus

A paper-feeding roller including a rubber composition containing short fibers in which the short fibers has an average fiber diameter not less than 10 &#x3bc;m nor more than 100 &#x3bc;m and an average fiber length not less than 0.01 mm nor more than 4 mm. At least one part of all of the short fibers is radially oriented at an angle not less than 10 degrees nor more than 90 degrees with respect to a plane which contacts a surface of the paper-feeding roller, with one end of each of the radially oriented short fibers disposed exposably on the surface of the paper-feeding roller.

Paper-feeding roller

A member for preventing feeding of a plurality of sheets at a time including a composition containing a resin component. Not less than 10 parts by mass nor more than 100 parts by mass of a polyester thermoplastic elastomer is contained in 100 parts by mass of the resin component. The polyester thermoplastic elastomer is composed of a hard segment and a soft segment. The hard segment consists of diester groups of aromatic dicarboxylic acid. The soft segment consists of ester groups of aliphatic carboxylic acid or aliphatic polyether groups.

Growing community of inventors

Hyogo, Japan

Toshiyuki Hirai