Control apparatus for energizing heating element

Details Control apparatus for energizing heating element Control apparatus for energizing heating element

1998-02-10

2000-08-01

Grimley, Arthur T.

Electrophotography

Diagnostics

Fixing

219494, 219497, 219507, G03G 1520, H05B 102, H05B 362

Patent

active

060979046

ABSTRACT:
In order to separately detect an abnormal temperature rise at a fixing roller of an image forming apparatus and a disconnection of a thermistor that detects the temperature of the fixing roller, the first and the second resistors are selected and connected to a thermistor for predetermined periods of time. When the first resistor is connected to the thermistor, a disconnection of the thermistor is detected based on a detection voltage that corresponds to the voltage division ratio of the reading for the first resistor to the reading for the thermistor. When the second resistor is connected to the thermistor, an abnormal temperature rise of the fixing roller is detected based on a detection voltage that corresponds to the voltage division ratio of the reading for the second resistor to the reading for the thermistor.

REFERENCES:
patent: 4500775 (1985-02-01), Sangu et al.
patent: 4656338 (1987-04-01), Yagasaki et al.
patent: 4740671 (1988-04-01), Kuroda et al.
patent: 5464964 (1995-11-01), Okuda et al.

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