Rotation control and heating control for a fixing rotatable member in rotational induction-heating type apparatus
First Claim
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1. A fixing apparatus comprising:
- a coil for generating a magnetic field;
a heat generating element for generating heat by the magnetic field, wherein an unfixed toner image on a recording material is fixed on the recording material by the heat generated by said heat generating element;
rotating means for rotating said heat generating element;
electric power supply control means for controlling electric power supply to said coil; and
detecting means for detecting information relating to a rotational speed of said heat generating element, wherein said electric power supply control means starts the electric power supply prior to rotating said heat generating element, and determines whether to continue the electric power supply to said coil on the basis of an output of said detecting means after rotation of said heat generating element.
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Abstract
A fixing apparatus has a coil for forming a magnetic field; a fixing rotatable member for fixing an unfixed toner image carried on a recording material thereon by heat generated by eddy currents which is generated by the magnetic field; an electric power supply control for controlling electric power supply to the coil; and a rotating mechanism for rotating the fixing rotatable member. On the basis of a state of rotation of the fixing rotatable member a predetermined time after operation the rotating mechanism, the electric power supply to the coil thereafter is selectively carried out.
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Citations
9 Claims
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1. A fixing apparatus comprising:
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a coil for generating a magnetic field;
a heat generating element for generating heat by the magnetic field, wherein an unfixed toner image on a recording material is fixed on the recording material by the heat generated by said heat generating element;
rotating means for rotating said heat generating element;
electric power supply control means for controlling electric power supply to said coil; and
detecting means for detecting information relating to a rotational speed of said heat generating element, wherein said electric power supply control means starts the electric power supply prior to rotating said heat generating element, and determines whether to continue the electric power supply to said coil on the basis of an output of said detecting means after rotation of said heat generating element. - View Dependent Claims (2, 3)
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4. A fixing apparatus comprising:
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a coil for generating a magnetic field;
a heat generating element for generating heat by the magnetic field, wherein an unfixed toner image on a recording material is fixed on the recording material by the heat generated by said heat generating element;
rotating means for rotating said heat generating element;
electric power supply control means for controlling electric power supply to said coil; and
rotating discriminating means for discriminating that said heat generating element is rotating when a rotational speed of said heat generating element is within a predetermined range, and for discriminating that said heat generating element is not rotating when the rotational speed of said heat generating element is out of a predetermined range, wherein said electric power supply control means starts electric power supply to said coil prior to said rotation discriminating means discriminating that said heat generating element is rotating, and said electric power supply control means determines whether to continue electric power supply to said coil on the basis of the discrimination of said rotation discriminating means upon elapse of a predetermined time from actuation of said heat generating element. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification