Law Office of Steven M. Rabin, P.C.
Roller for electrophotographic development apparatus
 An electrophotographic development apparatus capable of maintaining the surface roughness of a developer roller thereof for a long term or even for the life span of the apparatus. The developer roller includes an elastic layer, formed on a core metal shaft, and made of a rubber elastic material with additional insulating micro-powder of 30 to 200 parts having a particle diameter in a range of 1 to 50 micrometers, where the amount of the rubber elastic material constitutes 100 parts. During a printing operation, the insulating micro-powder drops from the elastic layer as the rubber elastic material is worn, so that the developer roller can maintain its surface roughness in proportion to the particle diameter of the dropped powder. 
Oki Electric Industry Co., Ltd.
Y G G G
Y10T G03G G03G G03G
additional inventional additional additional
Hiroshi Takao Hirokazu
Kikuchi Mizutani Ando