Electrophotography – Image formation – Development
Patent
1998-06-08
1999-10-05
Moses, Richard
Electrophotography
Image formation
Development
399254, G03G 1508
Patent
active
059637668
ABSTRACT:
A supply screw 10 and a collection screw 20 for a developing device equip with screw blades having different forms at particular sections so as to make conveying force of developer different depending on sections. Screw blades for big conveying force are attached within sections where developer distribution is dense while screw blades for small conveying force are attached within sections where developer distribution is sparse. In other words, conveying force is made to be greater at sparse-distribution section while smaller at dense-distribution section. Developer delivery is also promoted by providing different conveying force area within carry-up area where developer is carried up from a supply screw 10 to a collection screw 20 or vice versa. By making conveying force of each section different, developer is uniformly delivered to a developing roll 87 whether in width direction or in axial direction. Furthermore, developer circulation in a developing device becomes smooth.
REFERENCES:
patent: 4777512 (1988-10-01), Takahashi et al.
patent: 4800412 (1989-01-01), Ueda
patent: 4864349 (1989-09-01), Ito
patent: 4894688 (1990-01-01), Taniguchi et al.
patent: 4954404 (1990-09-01), Inoue et al.
Hamamichi Suguru
Katori Kentaro
Okuno Yukihiko
Sako Mineyuki
Shojo Yoshihiro
Minolta Co. , Ltd.
Moses Richard
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