Armstrong, Westerman, Hattori, McLeland & Naughton
Electrophotographic image-forming apparatus having developing device which includes a plurality of developing rollers
 A developing apparatus of an electrophotographic apparatus includes a housing for accommodating a developer, first, second and third developing rollers are rotatably disposed in the housing and arranged opposite to a photoconductor drum for conveying a developer carried on respective surfaces of the developing rollers, and a conveyor roller rotatably disposed in the housing for conveying the developer carried on a surface thereof to one of the developing rollers. First and second screw conveyors are disposed in the housing for conveying the developer in an axial direction opposite to each other. Each of these conveyors has an axial length larger than an axial length of the developing rollers. A partition wall is disposed between the first and second screw conveyors. A toner container for accommodating a toner is mounted on the housing. The toner in the toner container is supplied into the housing and agitators agitate the toner in the housing. A first doctor blade regulates the developer carried on the conveyor roller, a second doctor blade regulates the developer on the first developing roller, and scrapers scrape the developer from the second and third developing rollers. 
Fujitsu Limited
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Jun Osamu Tsutomu Yoshihiro Toshimasa Yuzuru Masaaki Toshio Hiroshi Hiroaki
Shimizu Watanabe Nagatomi Tonomoto Toyama Sugiura Ohyama Hino Sato Naito