Transfer power supply apparatus of an image forming machine

Details Transfer power supply apparatus of an image forming machine Transfer power supply apparatus of an image forming machine

2006-09-19

2006-09-19

Royer, William J. (Department: 2852)

Electrophotography

Control of electrophotography process

Having temperature or humidity detection

C399S066000, C399S314000

Reexamination Certificate

active

07110685

ABSTRACT:
A transfer power supply apparatus of an image forming machine which can maintain a predetermined degree of the quality of an image on a print medium even when the temperature of the surrounding environment varies. The image forming machine includes a voltage computation unit computing an appropriate voltage corresponding to resistance of an intermediate transfer medium, an output voltage generator generating a transfer voltage according to a signal output from the voltage computation unit, and a switching unit selectively applying a voltage output from the output voltage generator, wherein the switching unit connects a voltage output from the output voltage generator to a transfer roller when the image created on the intermediate transfer medium is transferred to a print medium, and connects a voltage output from the output voltage generator to a transfer backup roller when the image is not transferred to the print medium.

REFERENCES:
patent: 5740508 (1998-04-01), Matsuura et al.
patent: 6192203 (2001-02-01), Nishio et al.
patent: 6766125 (2004-07-01), Izumi
patent: 2002-72717 (2002-03-01), None
patent: WO 02/69056 (2002-09-01), None

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