Methods for transfering toner in direct transfer image forming

Details Methods for transfering toner in direct transfer image forming Methods for transfering toner in direct transfer image forming

2006-12-05

2010-02-02

Gray, David M (Department: 2852)

Electrophotography

Control of electrophotography process

Control of transfer

C399S314000

Reexamination Certificate

active

07657198

ABSTRACT:
The present application is directed to methods of controlling the transfer voltage in a transfer nip formed between the photoconductive member and the transfer member. The methods offset the effects of large transfer current spikes caused when a media sheet enters and exits the transfer nip. The control may include either ramping up or ramping down the transfer voltage. The ramped transfer voltage may include a series of alternating positive and negative steps that generally trend to ramp up or down. The size of the steps may further be adjusted to provide a smooth transition.

REFERENCES:
patent: 5884121 (1999-03-01), Kyung
patent: 6498907 (2002-12-01), Yoda

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