Developing apparatus having developing roller which is loaded vi

Details Developing apparatus having developing roller which is loaded vi Developing apparatus having developing roller which is loaded vi

1996-10-30

1999-11-23

Beatty, Robert

Electrophotography

Image formation

Development

399285, G03G 1508

Patent

active

059915870

ABSTRACT:
An electrophotographic developing apparatus uses a two-component developer comprising a carrier and a toner for development. The apparatus includes an intermediate roller with a non-magnetic sleeve accommodating a magnetic roller disposed between a developing roller and an agitating device for tribo-frictionally charging the carrier and the toner. After forming a magnetic brush consisting of the carrier and the toner, the toner is transferred to the developing roller by applying a first bias to the intermediate roller and the developing roller. A second bias is applied to the developing roller and an image carrier included in the apparatus to cause the toner to selectively attach to the image carrier. A third bias is applied to the developing roller and the intermediate roller to cause the toner to transfer back to the intermediate roller. The intermediate roller has two like polarity poles facing the agitating device and has a peripheral speed which is greater than the developing roller and photosensitive drum.

REFERENCES:
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patent: 4508052 (1985-04-01), Kohyama
patent: 4669852 (1987-06-01), Tajima et al.
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patent: 5523826 (1996-06-01), Jugle
patent: 5617190 (1997-04-01), Takenaka et al.
Koji Sakamoto, et al. "Mono-Component Development Process ", Ricoh Technical Report No. 16, Jan. 1987, pp. 18-20.

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