Temperature control apparatus for detecting an abnormality in a

Details Temperature control apparatus for detecting an abnormality in a Temperature control apparatus for detecting an abnormality in a

1986-10-30

1988-04-26

Paschall, M. H.

Wooden receptacles

Barrels

Ventilated

219497, 219508, 219494, 340588, H05B 102

Patent

active

047406712

ABSTRACT:
A temperature control apparatus for controlling, e.g., a fixing heater of a copying machine has a fuse resistor connected to the fixing heater through a power relay, a thermistor for detecting the surface temperature of a fixing roller heated by the fixing heater, abnormality timers for counting the ON time of the fixing heater and having different preset counts corresponding to different modes of the copying machine, and a control circuit for disconnecting the fuse resistor when the output from the thermistor indicates overheating or the ON time of the heater exceeds the preset count of the timer. Overheating of the heater is prevented with high reliability.

REFERENCES:
patent: 4461951 (1984-07-01), Luoma, II et al.
patent: 4500775 (1985-02-01), Sangu et al.
patent: 4502043 (1985-02-01), Moore

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