Temperature control method for a fixing device

Details Temperature control method for a fixing device Temperature control method for a fixing device

1991-12-20

1994-02-15

Grimley, A. T.

Photocopying

Contact printing

Light boxes

219216, 355205, G03G 1520

Patent

active

052871550

ABSTRACT:
A method of controlling the surface temperature of a heat roller included in a fixing device and having a heater therein by sensing it by a thermistor. The thermistor is held in contact with the heat roller during warm-up operation and in a standby condition or spaced apart from the heat roller while a copying operation is under way. The heater is on/off controlled on the basis of a temperature measured when the thermistor is spaced apart from the heat roller. The method corrects this temperature by comparing temperatures measured in the contact and non-contact positions of the thermistor. In such a correction mode, if the difference between the two measured temperatures does not lie in a predetermined range, the method stops energizing the heater determining that an error has occurred.

REFERENCES:
patent: 4603245 (1986-07-01), Yagasaki
patent: 4801974 (1989-01-01), Suto et al.
patent: 4868368 (1989-09-01), Araki
patent: 4949131 (1990-08-01), Ito

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