Cleaning method for transfer device of image forming apparatus

Details Cleaning method for transfer device of image forming apparatus Cleaning method for transfer device of image forming apparatus

2006-03-03

2009-02-24

Royer, William J (Department: 2852)

Electrophotography

Control of electrophotography process

Control of transfer

C399S101000

Reexamination Certificate

active

07496306

ABSTRACT:
A constant current output is applied to a backup roller or a secondary transfer member, and a cleaning bias is controlled according to a measurement obtained by monitoring a voltage generated at that time. Cleaning biases of a plus polarity and a minus polarity are alternately applied to the backup roller to recover the toner adhered on the secondary transfer member to an intermediate transfer belt. The cleaning bias is controlled according to the combined resistance of a secondary transfer section which is varied with not only the environment of an image forming apparatus, but also the condition of use and various factors to recover the toner adhered to the secondary transfer member to the intermediate transfer belt without fail, thereby preventing smudges on the back of a sheet of paper or smudges on images.

REFERENCES:
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patent: 6341205 (2002-01-01), Yoshino et al.
patent: 6766125 (2004-07-01), Izumi
patent: 6898393 (2005-05-01), Kawamura
patent: 7035563 (2006-04-01), Sawada
patent: 2004-004283 (2004-01-01), None

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