Image fixing apparatus

Details Image fixing apparatus Image fixing apparatus

2011-01-04

2011-01-04

Gray, David M (Department: 2852)

Electrophotography

Control of electrophotography process

Control of fixing

C399S045000, C399S334000, C219S216000

Reexamination Certificate

active

07865102

ABSTRACT:
A fixing apparatus includes a control circuit which controls the electrifying to a first heater so that a temperature detected by a first temperature detection portion reaches a first target temperature and controls the electrifying to a second heater so that a temperature detected by a second temperature detection portion reaches a second target temperature, when warm-up is initiated, and, when the warm-up initiated, if an initial temperature of a rotary member is below a predetermined temperature, the control circuit sets the first target temperature to a temperature value greater than the first target temperature set when the initial temperature of the rotary member is greater than the predetermined temperature and sets the second target temperature to a temperature value greater than the second target temperature set when the initial temperature of the rotary member is greater than the predetermined temperature. In this way, hot offset and poor fixing can be prevented and a pre-heating operation time can be prevented from extending excessively.

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patent: 2004-341398 (2004-12-01), None
patent: 2006-11120 (2006-01-01), None

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