Apparatus and method for protecting fixing unit in image forming

Details Apparatus and method for protecting fixing unit in image forming Apparatus and method for protecting fixing unit in image forming

1991-09-23

1995-01-31

Smith, Matthew S.

Photocopying

Contact printing

Light boxes

219216, 355282, G03G 2100

Patent

active

053862724

ABSTRACT:
A fixing unit protection apparatus and method for protecting a fixing unit in an image forming system against damage. The apparatus includes a first detection part for detecting a fixing temperature of a fixing roller in the fixing unit at which toner is fixed on a copy sheet, the fixing roller being heated by a heater provided within the fixing roller, and a fixing temperature control part for switching ON and OFF current applied to the heater in response to the fixing temperature, so as to prevent the fixing temperature from being an excessively high temperature. The apparatus also includes a signal generating part for generating a signal which serves to forcedly switch OFF the current applied to the heater for a short time periodically at a first time interval, a second detection part for detecting an ON state of the heater in which the current is continuously applied to the heater, and a current cutting part for cutting off the application of the current to the heater when the ON state of the heater continues for more than a second time interval which is longer than the first time interval.

REFERENCES:
patent: 3940210 (1976-02-01), Donohue
patent: 4556779 (1985-12-01), Hashimoto et al.
patent: 4627714 (1986-12-01), Nozaki
patent: 4745430 (1988-05-01), Tsuchiya
patent: 4994852 (1991-02-01), Matsuuchi et al.
patent: 5023631 (1991-06-01), Negishi et al.
patent: 5032874 (1991-07-01), Matsuuchi

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