Technique for controlling transfer voltage in an image forming a

Details Technique for controlling transfer voltage in an image forming a Technique for controlling transfer voltage in an image forming a

1999-04-02

2000-05-30

Lee, Susan S. Y.

Electrophotography

Control of electrophotography process

Control of transfer

G03G 1516

Patent

active

060700254

ABSTRACT:
An image forming apparatus reads a composite resistance of an OPC drum and a transfer roller before a sheet of recording paper has advanced between the OPC drum and the transfer roller to provide a proper transfer voltage. To this end, the apparatus provides a first transfer voltage to the transfer roller to detect a composite resistance between the OPC drum and the transfer roller, before the recording paper has advanced between the OPC drum and the transfer roller. When the leading edge of the recording paper has arrived between the OPC drum and the transfer roller, the apparatus provides the transfer roller with a second transfer voltage in accordance with the detected composite resistance. Further, a composite resistance of the OPC drum, the transfer roller and the recording paper is detected after the second transfer voltage is supplied to the transfer roller. The transfer roller is then provided with a third transfer voltage in accordance with the detected composite resistance of the OPC drum, the transfer roller and the recording paper.

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