Electrophotography – Image formation – Development
Patent
1995-10-03
1997-08-19
Brase, Sandra L.
Electrophotography
Image formation
Development
G03G 1509
Patent
active
056598602
ABSTRACT:
In an image forming apparatus, a developing device has a developing sleeve accommodating a magnet roller therein, and a doctor for regulating the amount of developer to be conveyed to a developing position. When the developing sleeve is rotated, the part of the doctor shaved off by the doctor from the sleeve is moved in a developer storing section to a toner replenishing opening formed in a toner storing section. Then, this part of the developer is returned to the doctor along the surface of the sleeve via the toner replenishing opening. The developer consists of a first developer containing a first carrier and deposited in a layer on the surface of the sleeve, and a second developer containing a second carrier different from the first carrier and stored in the developer storing section in such a manner as to contact the first developer deposited on the sleeve. The first carrier has a higher charging ability than the second carrier. The device does not need a toner replenishing mechanism or a toner concentration sensor and has, therefore, a miniature and inexpensive construction. In addition, the device is applicable even to a high-speed image forming apparatus.
REFERENCES:
patent: 4937628 (1990-06-01), Cipolla et al.
patent: 5095339 (1992-03-01), Terashima
patent: 5267003 (1993-11-01), Grappiolo
patent: 5267007 (1993-11-01), Watanabe et al.
patent: 5395717 (1995-03-01), Ozawa et al.
patent: 5525752 (1996-06-01), Izumizaki et al.
Akiba Yasushi
Gohhara Hidefumi
Mochizuki Satoshi
Oka Seiji
Oyama Hajime
Brase Sandra L.
Ricoh & Company, Ltd.
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