Heater controlling apparatus and a fixing apparatus of an electrophotographic apparatus in use therewith
First Claim
1. A fixing apparatus for an image forming apparatus, said fixing apparatus comprising:
- a heater, adapted in said fixing apparatus, for heating a fixing member;
a zero-cross detector for detecting zero-cross timings of electric power when a voltage of said electric power is at zero volts;
a switching device for turning on and turning off supply of said electric power to said heater;
a controller for controlling said switching device so as to provide a first state in which said electric power is continuously supplied to said heater for a multiple of half-cycles from one of said zero-cross timings, and a second state in which said electric power is prevented to be supplied to said heater for a multiple of half-cycles from another of said zero-cross timings;
wherein said electric power is supplied to said heater with an intermittent pattern, including said second state, for a predetermined period after at least one of a turn-on operation of said heater and a turn-off operation of said heater.
1 Assignment
0 Petitions
Accused Products
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.
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Citations
11 Claims
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1. A fixing apparatus for an image forming apparatus, said fixing apparatus comprising:
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a heater, adapted in said fixing apparatus, for heating a fixing member; a zero-cross detector for detecting zero-cross timings of electric power when a voltage of said electric power is at zero volts; a switching device for turning on and turning off supply of said electric power to said heater; a controller for controlling said switching device so as to provide a first state in which said electric power is continuously supplied to said heater for a multiple of half-cycles from one of said zero-cross timings, and a second state in which said electric power is prevented to be supplied to said heater for a multiple of half-cycles from another of said zero-cross timings; wherein said electric power is supplied to said heater with an intermittent pattern, including said second state, for a predetermined period after at least one of a turn-on operation of said heater and a turn-off operation of said heater. - View Dependent Claims (2, 3, 4, 5)
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6. A fixing apparatus for an image forming apparatus, said fixing apparatus comprising:
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a heater, adapted in said fixing apparatus, for heating a fixing member; a zero-cross detector for detecting zero-cross timings of electric power when a voltage of said electric power is at zero volts; a switching device for turning on and turning off supply of said electric power to said heater; a direct current power supply for generating a direct current from an alternative current of said electric power; a controller for controlling said switching device so as to provide a first state in which said electric power is continuously supplied to said heater for a multiple of half-cycles from one of said zero-cross timings, and a second state in which said electric power is prevented to be supplied to said heater for a multiple of half-cycles from another of said zero-cross timings; wherein said electric power is supplied to said heater with an intermittent pattern, including said second state, for a predetermined period after at least one of a turn-on operation of said heater and a turn-off operation of said heater. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification