Heater controlling apparatus and a fixing apparatus of an electr

Electrophotography – Control of electrophotography process – Control of fixing

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Details

219216, 219492, 219497, G03G 1520, H05B 102

Patent

active

056690380

ABSTRACT:
A fixing unit for printers or copiers includes a heater, in the fixing unit, for heating a fixing member to fix a toner image on a sheet; a zero-cross detector for detecting zero-cross timings of electric power when a voltage of the electric power is at zero volts; a switching circuit for turning on and off the electric power to the heater; a controller for controlling the switching operation of the circuit so as to provide a first state in which the electric power is continuously supplied to the heater for a second state in which the electric power is not supplied to the heater for a multiple of half-cycles from one of the zero cross timings. In the fixing unit, the electric power is supplied to the heater with an intermittent pattern, including the second state, for a predetermined period after at least one of a turn-on operation of the heater and a turn-off operation of the heater.

REFERENCES:
patent: 4374321 (1983-02-01), Cunningham, Jr. et al.
patent: 4603245 (1986-07-01), Yagasaki
patent: 4627714 (1986-12-01), Nozaki
patent: 5079409 (1992-01-01), Takada et al.
patent: 5239164 (1993-08-01), Hirota
patent: 5367369 (1994-11-01), Nakai et al.

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