Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1988-11-28
1990-11-06
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219508, 219505, 219494, 219501, 355290, H05B 102
Patent
active
049688723
ABSTRACT:
The present invention relates to an image forming apparatus such as a copying machine and the like, and more in particular to the temperature control at a fixing unit thereof. In the image forming apparatus according to the present invention, the temperature of the fixing unit is controlled to be kept at the first set point by the first temperature control structure in normal operation, and when the temperature of the fixing unit comes to reach the second set point as a result of the first temperature control structure getting out of order, the temperature of the fixing unit is controlled to be kept at the second set point by the second temperature control structure. Consequently, the temperature of the fixing unit can be controlled to be kept within a desired range even when the first temperature control means gets out of order. As a result, it is possible not only to prevent thermal damages of parts caused by temperature rise at the fixing unit, but also to aim at improving the quality of prints as well as carrying out power saving.
REFERENCES:
patent: 3936658 (1976-02-01), Traister et al.
patent: 4282423 (1981-08-01), Volz
patent: 4320285 (1982-03-01), Koether
patent: 4367399 (1983-01-01), Anthony et al.
patent: 4493984 (1985-01-01), Yamuchi
patent: 4677282 (1987-06-01), Walsh
Minolta Camera Kabushiki Kaisha
Paschall M. H.
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