Fixing device, image forming apparatus, and method of...

Details Fixing device, image forming apparatus, and method of... Fixing device, image forming apparatus, and method of...

2009-02-26

2011-11-22

Porta, David (Department: 2884)

Electrophotography

Diagnostics

Fixing

C399S069000, C399S330000, C219S216000

Reexamination Certificate

active

08064785

ABSTRACT:
A fixing device according to this invention includes a heating roller, a heater driver, a thermistor, and a CPU. The heating roller has a heater and heats a recording sheet. The heater driver drives the heater. The thermistor detects a surface temperature of the heating roller. The CPU stops an operation of the heater driver when the surface temperature of the heating roller becomes higher than a predetermined temperature and, thereafter, causes the thermistor to perform detection of the surface temperature of the heating roller for a predetermined time period and issues an alarm about occurrence of a first abnormality when the surface temperature of the heating roller fails to drop in the predetermined time period.

REFERENCES:
patent: 5600406 (1997-02-01), Aikawa et al.
patent: 6597879 (2003-07-01), Akutsu et al.
patent: 2006/0088328 (2006-04-01), Yoshimura et al.
patent: 2-309382 (1990-12-01), None
patent: 3-62207 (1991-03-01), None
patent: 5-35146 (1993-02-01), None
patent: 7-287473 (1995-10-01), None
patent: 2006-243652 (2006-09-01), None

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