Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1992-08-07
1994-11-15
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219492, 219505, 219216, 307117, H05B 102
Patent
active
053650409
ABSTRACT:
A fixing device of an image forming apparatus for fixing a toner image on a paper by a heating roller and a pressure roller, and having a detector for detecting the temperature of the heating roller. The fixing device controls to supply the electric current to the heating roller intermediately between on state and off state by repeatedly switching on and off the electric current when the difference between the detection temperature signal detected by the detector and a reference temperature signal is within a predetermined value.
In detail, the fixing device overlays a periodically changing signal on at least one of the detection temperature signal and the reference temperature signal by a signal convertor so as to control the current supplied to the heating roller in accordance with the comparison result of the detection temperature signal and the reference temperature signal output from the signal convertor.
REFERENCES:
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patent: 4495405 (1985-01-01), Foster
patent: 4554439 (1985-11-01), Cross et al.
patent: 4614860 (1986-09-01), Kativois
patent: 4968872 (1990-11-01), Kusumoto
patent: 5179263 (1993-01-01), Koh et al.
Minolta Co. , Ltd.
Paschall Mark H.
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