Patent Number: 6,167,227

Title: Developing unit and image forming apparatus

Abstract: A developing unit and an image forming apparatus includes drive and control mechanisms for the conveyance of collected toner and fresh toner in an uncomplicated structure and an uncomplicated toner supplying roller structure for the reduction in manufacturing cost. Fresh toner and collected toner stored in housing parts of a toner housing are discharged from an outlet via openings formed in a partitioning member for forwarding to a developing section by a toner supplying roller disposed to confront the outlet. The toner supplying roller is provided in common to fresh toner and collected toner. The toner supplying roller includes a single rotary shaft and a plurality of composite members which are fit into the rotary shaft. Each of the composite members has a cylindrical hollow body and a cylindrical elastic body which is fit onto the outer peripheral surface of the hollow body. The composite members are disposed correspondingly to the housing parts.

Inventors: Fujita; Syouichi (Kashiba, JP), Kawabata; Itaru (Kashiba, JP), Nishino; Toshio (Yamatokoriyama, JP), Sakita; Hirofumi (Tenri, JP), Saiko; Hideji (Nara, JP), Tokuyama; Mitsuru (Kyoto, JP)

Assignee: Sharp Kabushiki Kaisha

International Classification: G03G 15/08 (20060101); G03G 21/10 (20060101); G03G 015/08 ()

Expiration Date: 12/26/2017