Paper feed roller

Abstract

Provided is a paper feed roller in which paper conveyance failure is suppressed over a long period of time. The paper feed roller is a paper feed roller 10 including a shaft body 12 and an elastic body layer 14 formed on an outer periphery of the shaft body 12. A plurality of convex portions 16 forming surface unevenness is arranged on a peripheral surface of the elastic body layer 14. The contact area of the entire parts in contact with a glass surface when a glass plate is pressed against the peripheral surface of the paper feed roller 10 with a load of 0.5 to 2.3 N per centimeter in an axial direction is 1.0 to 15% of the nip area with the glass surface.

What is claimed is: 
     
         1 . A paper feed roller for electrophotographic device, comprising a shaft body and an elastic body layer formed on an outer periphery of the shaft body, wherein
 a plurality of convex portions forming surface unevenness is arranged on a peripheral surface of the elastic body layer,   a contact area of the entire parts in contact with a glass surface when a glass plate is pressed against the peripheral surface of the paper feed roller with a load of 0.5 to 2.3 N per centimeter in an axial direction is 1.0 to 15% of a nip area with the glass surface,   the ratio of the contact area per convex portion in the entire parts in contact with the glass surface is 0.02 to 10%,   the plurality of convex portions is regularly arranged on the peripheral surface of the elastic body layer,   the plurality of convex portions consists of two types of convex portions having different heights, and   the height of the low convex portions is 70 to 80% of the height of the high convex portions in the two types of convex portions having different heights.