Image forming apparatus having means for adsorbing impurities co

Details Image forming apparatus having means for adsorbing impurities co Image forming apparatus having means for adsorbing impurities co

1997-04-09

1998-09-01

Grimley, Arthur T.

Electrophotography

Image formation

Development

399 98, G03G 1506, G03G 2100

Patent

active

058024301

ABSTRACT:
An image forming apparatus of the present invention includes a developing device for forming a developed image by transferring a developing agent to an electrostatic latent image formed on a photosensitive drum, a developing agent recycling mechanism for returning the developing agent recovered from the photosensitive drum by a cleaning device to the developing device after transferring the developed image formed on the photosensitive drum on a sheet paper, and a contact member for adsorbing impurities contained in the developing agent returned by the recycling mechanism by an adsorbing voltage having a voltage and polarity defined based on the charged polarity of the developing agent and the developing bias voltage applied to the developing roller and the developing agent of the developing device.

REFERENCES:
patent: 3645618 (1972-02-01), Lancia et al.
patent: 4639115 (1987-01-01), Lin
patent: 4768055 (1988-08-01), Takamatsu et al.
patent: 5153642 (1992-10-01), Folkins et al.
patent: 5231458 (1993-07-01), Nishimura

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