Image forming apparatus having transfer bias voltage

Details Image forming apparatus having transfer bias voltage Image forming apparatus having transfer bias voltage

2006-11-21

2006-11-21

Beatty, Robert (Department: 2852)

Electrophotography

Control of electrophotography process

Control of transfer

C399S299000

Reexamination Certificate

active

07139498

ABSTRACT:
A tandem-type image forming apparatus for forming a multi-color image on a sheet transported by an endless transfer/transport belt, by sequentially laying on the sheet images developed in respective image forming stations. The apparatus includes: transfer rollers, each in contact through the transfer/transport belt with an image carrier provided in each image forming station; and a voltage applying device for applying a non-transfer bias voltage to only the transfer rollers that are in contact with the image carriers when a transfer process is not performed, the non-transfer bias voltage having the same polarity as a transfer bias voltage and being lower than the transfer bias voltage.

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