Electrophotography – Image formation – Development
Patent
1998-10-14
2000-09-19
Royer, William
Electrophotography
Image formation
Development
399255, 399256, G03G 1508
Patent
active
061224723
ABSTRACT:
The present invention is to provide a developing apparatus having a supply screw and a recovery screw both of which are arranged vertically to circulate developer, wherein a component in a normal direction of pressure generated by the recovery screw is made larger than that of pressure generated by the supply screw. Thereby, lowering and raising of developer is suppressed and occurrence of fog on the image and the smoke of toner are prevented. Alternatively, a radial member and a centrifugal member are applied to the supply screw and the recovery screw, respectively. Thereby, developer is prevented from moving between screws in the midst of the transportation. Still alternatively, a preliminary stirring portion is provided on extension of a stirring screw at upperstream side. The preliminary stirring portion has a cylindrical body with inlets and outlets. Both inside and outside of the cylindrical body, screws are provided and inclines of screw blades are reversed to each other. Thereby, it enables the developing apparatus to transport the developer which is sufficiently stirred and charged to a development zone without being accompanied by a large-scaled apparatus.
REFERENCES:
patent: 4928144 (1990-05-01), Kasahara et al.
patent: 4940014 (1990-07-01), Saijo et al.
patent: 5220382 (1993-06-01), Hediger
patent: 5495320 (1996-02-01), Araki et al.
patent: 5682584 (1997-10-01), Hattori et al.
patent: 5758238 (1998-05-01), Mordenga et al.
Hamamichi Suguru
Okuno Yukihiko
Sako Mineyuki
Yoshimoto Shin-ichi
Minolta Co. , Ltd.
Royer William
Tran Hoan
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