Color image forming apparatus having bias controller for cleanin

Details Color image forming apparatus having bias controller for cleanin Color image forming apparatus having bias controller for cleanin

1996-02-23

1997-11-18

Beatty, Robert

Electrophotography

Internal machine environment

Particle or contaminant control

G03G 1516

Patent

active

056897715

ABSTRACT:
A color toner image forming apparatus comprises a transferring roller having an average cell diameter of 1 .mu.m to 300 .mu.m to transfer a toner image from a photoreceptor drum to a sheet. During the transferring operation, the electric bias member applies onto the transferring roller an opposite electric bias of a constant current having the opposite electric polarity to that of the toner image, and during a cleaning operation to shift toner adhered on the transferring member to the photoreceptor, the electric bias member applies onto the transferring member alternately an identical electric bias of a constant voltage having the identical electric polarity with that of the toner image and an opposite electric bias of a constant current having the opposite electric polarity to that of the toner image six times or more.

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patent: 5253022 (1993-10-01), Takeuchi et al.
patent: 5287149 (1994-02-01), Hoshika
patent: 5331383 (1994-07-01), Nou et al.
patent: 5337127 (1994-08-01), Imaue
patent: 5420668 (1995-05-01), Okano

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