Apparatus for detecting the proper functioning of a thermal fixi

Details Apparatus for detecting the proper functioning of a thermal fixi Apparatus for detecting the proper functioning of a thermal fixi

1991-08-21

1992-06-09

Hix, L. T.

Photocopying

Projection printing and copying cameras

With developing

355 30, 355 72, G03B 2732

Patent

active

051211564

ABSTRACT:
An image forming apparatus has a thermal fixing unit which includes a heater to thermally fix an image on a recording medium. The temperature in the apparatus goes down when a replaceable unit is exchanged. A temperature sensor detects the reduction in temperature. A status sensor detects an exchanging state in which the replaceable unit is exchanged and outputs a detection signal indicating the exchanging state. A CPU judges that the heater is properly operating even if the temperature signal indicates the reduction in temperature when the detection signal is outputted.

REFERENCES:
patent: 4893147 (1990-01-01), Tanabe et al.
patent: 4914479 (1990-04-01), Ogura et al.

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