Abstract: The paper feed roller according to the present invention is made of a thermoplastic elastomer composition containing an ester thermoplastic elastomer urethane or an ether thermoplastic elastomer urethane (E) having microrubber hardness (type A) of not less than 60 and not more than 80 and a plasticizer (P) in a mass ratio E/P of 70/30 to 50/50.

Abstract: 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.

Abstract: To provide a paper feed roller which hardly causes deterioration in the frictional coefficient due to paper powder accumulation and an accompanying paper conveyance failure, and can keep excellent paper feeding for a longer period. A paper feed roller 1 including a roller main body 2 made of a rubber composition which contains EPDM, IR, and BR or SBR as rubber components, where the mass ratio R1 of the three kinds of rubber components expressed by the following equation (1): R1=MEPDM/(MIR+Mx)??(1) (in the equation, MEPDM represents the parts by mass of EPDM, MIR represents the parts by mass of IR, and Mx represents the parts by mass of BR or SBR) is not less than 25/75 and not more than 75/25.

Abstract: The inventive sheet conveying roller includes a plurality of linear projections (6) provided on an outer peripheral surface (5) of a roller body (2) of an elastic material and each having a generally right-angled triangular cross section which includes a hypotenuse edge (7) and an adjoining edge (9) provided on a forward side and on a rearward side, respectively, with respect to a roller body rotation direction, the adjoining edge (9) aligning with a line (8) perpendicular to a center axis (L) of the roller body (2). The linear projections (6) are rounded with the hypotenuse edges (7) and the adjoining edges (9) thereof connected to each other by curves (10, 11) as seen in section, and provided integrally with the roller body (2) to be equidistantly arranged on the outer peripheral surface of the roller body.

Abstract: The rubber composition according to the present invention is a rubber composition for forming the body of a paper feed roller, containing a rubber component, a crosslinking agent and a filler, wherein the rubber component is at least a single type selected from a group consisting of: (1) non-oil-extended ethylene propylene diene rubber having Mooney viscosity (at 100° C.) of 15 to 50; (2) a mixture of non-oil-extended ethylene propylene diene rubber having Mooney viscosity (at 100° C.) of 15 to 50 and oil of not more than 10 parts by mass with respect to 100 parts by mass of the non-oil-extended ethylene propylene diene rubber; (3) a mixture of non-oil-extended ethylene propylene diene rubber having Mooney viscosity (at 100° C.) of 15 to 50 and liquid ethylene propylene diene rubber; and (4) a mixture of non-oil-extended ethylene propylene diene rubber having Mooney viscosity (at 100° C.

Abstract: To provide a paper feed roller which hardly causes deterioration in the frictional coefficient due to paper powder accumulation and an accompanying paper conveyance failure, and can keep excellent paper feeding for a longer period. A paper feed roller 1 including a roller main body 2 made of a rubber composition which contains EPDM, IR, and BR or SBR as rubber components, where the mass ratio R1 of the three kinds of rubber components expressed by the following equation (1): R1=MEPDM/MIR+Mx??(1) (in the equation, MEPDM represents the parts by mass of EPDM, MIR represents the parts by mass of IR, and MX represents the parts by mass of BR or SBR) is not less than 25/75 and not more than 75/25.

Abstract: The paper feed roller according to the present invention is made of a thermoplastic elastomer composition containing an ester thermoplastic elastomer urethane or an ether thermoplastic elastomer urethane (E) having microrubber hardness (type A) of not less than 60 and not more than 80 and a plasticizer (P) in a mass ratio E/P of 70/30 to 50/50.

Abstract: The paper feed roller according to the present invention is made of (1) a thermoplastic elastomer composition containing an ester thermoplastic elastomer urethane (E) having microrubber hardness (type A) of not less than 80 and not more than 95 and at least one plasticizer (P) selected from a group consisting of an ether ester plasticizer and a phthalic ester plasticizer in a mass ratio E/P of 95/5 to 70/30, or (2) a thermoplastic elastomer composition containing an ether thermoplastic elastomer urethane (E) having microrubber hardness (type A) of not less than 80 and not more than 95 and at least one plasticizer (P) selected from a group consisting of an ether ester plasticizer, a phthalic ester plasticizer and a phosphoric acid plasticizer in a mass ratio E/P of 95/5 to 70/30.

Abstract: 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 ?m nor more than 100 ?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.

Abstract: A paper sheet multi-feed preventing member 3 being planar includes an outer layer 8 which comes into contact with a paper sheet 5 and an inner layer 9 laminated on the outer layer 8, the inner layer 9 has a type A durometer hardness not less than A5/S and not more than A60/S, or an Asker-C hardness not less than C5 and not more than C50, and the outer layer 8 has a rubber hardness higher than that of the inner layer 9.

Abstract: A paper-feeding roller (3) including a core (2) and a rubber roll (1) mounted on a peripheral surface of the core (2). The rubber roll (1) has a three-layer construction composed of an inner layer (11), an intermediate layer (12), and an outer layer (13). The inner layer (11), the intermediate layer (12), and the outer layer (13) are a non-foamed layer respectively. The JIS-A hardness of the inner layer (11) is set to not more than 10 degrees. The JIS-A hardness of the outer layer (13) is set to a range of 25 to 60 degrees.

Abstract: 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.

Abstract: A paper feed roller having an inner layer and an outer layer both consisting of rubber, with a peripheral surface of the inner layer and an inner peripheral surface of the outer layer in close contact without forming a gap therebetween. A rubber component of the inner layer consists of butyl rubber. A rubber component of the outer layer consists of EPDM, silicone rubber or urethane rubber. The JIS-A hardness of the inner layer is set to not more than 10 degrees, and the JIS-A hardness of the outer layer is set to not less than 25 nor more than 60 degrees.

Abstract: A paper-feeding roller (3) including a core (2) and a rubber roll (1) mounted on a peripheral surface of the core (2). The rubber roll (1) has a three-layer construction composed of an inner layer (11), an intermediate layer (12), and an outer layer (13). The inner layer (11), the intermediate layer (12), and the outer layer (13) are a non-foamed layer respectively. The JIS-A hardness of the inner layer (11) is set to not more than 10 degrees. The JIS-A hardness of the outer layer (13) is set to a range of 25 to 60 degrees.

Abstract: 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.

Abstract: 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 ?m nor more than 100 ?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.

Abstract: An object of the present invention is to provide a paper feeding rubber roller capable of preventing paper powder from depositing and accumulating on the surface when a paper feeding and carrying treatment is repeated in a paper feeding and carrying system of an image forming apparatus, which can be produced by a simple manner, and a method of producing the same. The paper feeding rubber roller of the present invention is preferably produced in the following manner. That is, using a rubber containing a paraffin-, ester- or olefin-based plasticizer, a rubber roller made of a rubber having a hardness after vulcanization or crosslinking within a range from 30 to 37 in terms of JIS A hardness is molded, and then the surface of the rubber roller is polished by a cylindrical grinder to form polishing marks having an average height of 50 to 120 ?m.