Patent ID: 7866657

Claim:
A paper-feeding rubber roller having a friction coefficient retention ratio from 68 to 85% and feeds 1000 sheets of paper on which printing is performed using a polymerization toner, said rubber roller being formed by a transfer molding method and is formed from a rubber composition containing 100 parts by weight of rubber and not less than 0.1 nor more than 20 parts by weight of short fibers per said amount of rubber, said rubber consisting of silicone rubber or ethylene-propylene-diene rubber and wherein said short fibers consist of carbon fibers or glass fibers, said short fibers having an average fiber diameter not less than 10 μm nor more than 100 μm and an average fiber length not less than 0.01 mm nor more than 4 mm; and at least one part of all of said short fibers being 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 said paper-feeding roller with one end of each of said radially oriented short fibers exposed on said surface of said paper-feeding roller, wherein the number of said short fibers having one end exposed on said surface of said paper-feeding roller is not less than five nor more than 100 per square millimeter of said surface of said rubber roller; and wherein said exposed short fibers project from said surface of said paper-feeding roller a distance of 5 μm to 150 μm.