Method for controlling power supply to fixing roller in...

Details Method for controlling power supply to fixing roller in... Method for controlling power supply to fixing roller in...

2006-10-17

2006-10-17

Paschall, Mark (Department: 3742)

Electric heating

Heating devices

With power supply and voltage or current regulation or...

C219S508000, C219S216000, C399S069000

Reexamination Certificate

active

07122767

ABSTRACT:
A fixing roller in an image forming apparatus (such as a copier) has a fixing heater that is supplied power from a capacitor. The fixing heater, the capacitor, a mechanical switch (such as a relay) and a semiconductor switch (such as a FET) are serially connected. As a cover of the apparatus is opened, an interlock switch is turned on and outputs an off-signal to a CPU, which turns off the semiconductor switch prior to turning off the mechanical switch, and thereby prevents a counter-electromotive voltage due to an inrush current.

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patent: 2002-184554 (2002-06-01), None
patent: 2003-295659 (2003-10-01), None
patent: 2003-297526 (2003-10-01), None
patent: 2003295659 (2003-10-01), None

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