Temperature control device for fixing heat source of copying mac

Details Temperature control device for fixing heat source of copying mac Temperature control device for fixing heat source of copying mac

1983-02-07

1985-01-15

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219497, 219505, 219216, 323236, H05B 102

Patent

active

044939841

ABSTRACT:
A temperature control device for a fixing heat source of a copying machine includes circuits for supplying power to the fixing heat source in synchronism with the zero-cross point of an a.c. signal applied from an a.c. power source. The device functions to supply the full-wave current to the heat source until a first predetermined temperature is sensed by a temperature sensor, to supply the half-wave current to the heat source until a second predetermined temperature is then sensed, and to change the duty factor of the half-wave current after attainment of the second predetermined temperature, thereby maintaining constant the temperature of the heat source with high accuracy.

REFERENCES:
patent: 3878358 (1975-04-01), Barton et al.
patent: 4085309 (1978-04-01), Godel
patent: 4214151 (1980-07-01), Kicherer
patent: 4377739 (1983-03-01), Eckert, Jr.

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