Fixing apparatus and image forming apparatus

Details Fixing apparatus and image forming apparatus Fixing apparatus and image forming apparatus

2006-11-21

2006-11-21

Gray, David M. (Department: 2851)

Electrophotography

Diagnostics

Fixing

C399S069000

Reexamination Certificate

active

07139495

ABSTRACT:
If a temperature of a heat roller12rises abnormally, a thermostat54operates. When the thermostat54operates, a conduction path to an excitation coil91of a relay90is cut off so that a normally open contact92of the relay90can be operated. When the normally open contact92operates, the supply path of a drive signal supplied from a frequency variable oscillator81to a transistor63is cut off. By the cut-off, a high-frequency current does not flow through coils14ato14c; therefore, induction heating with respect to the heat roller12is stopped.

REFERENCES:
patent: 6246843 (2001-06-01), Nanataki et al.
patent: 6615003 (2003-09-01), Nakayama
patent: 6724999 (2004-04-01), Kikuchi et al.
patent: 2003/0228178 (2003-12-01), Morihara
patent: 8-339134 (1996-12-01), None
patent: 9-197854 (1997-07-01), None
patent: 2002-236429 (2002-08-01), None

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