Transfer device and image forming apparatus

Details Transfer device and image forming apparatus Transfer device and image forming apparatus

2007-01-09

2007-01-09

Nguyen, Vincent Q. (Department: 2858)

Electrophotography

Internal machine environment

Particle or contaminant control

Reexamination Certificate

active

11002708

ABSTRACT:
A timer clocks and accumulates time periods during each of which a recording sheet is transported or transfer bias is applied as transfer execution periods. When the accumulated value reaches a predetermined value, the timer outputs a time-up signal to a CPU and then clears the accumulated value. The CPU executes a cleaning operation at the time the time-up signal is inputted from the timer. In the cleaning operation, the CPU causes a high-voltage power source to apply cleaning bias to a transfer electrode roller while causing a high-voltage power source to apply delivery bias to an auxiliary cleaning roller, in order to return toner attracted to the auxiliary cleaning roller to a photosensitive drum via a transfer belt.

REFERENCES:
patent: 6002905 (1999-12-01), Matsuda
patent: 2005/0078972 (2005-04-01), Soda et al.
patent: 07-168454 (1995-07-01), None
patent: 08-179640 (1996-07-01), None
patent: 09-006150 (1997-01-01), None
patent: 10-133489 (1998-05-01), None
patent: 2000-250326 (2000-09-01), None

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