Image heating apparatus having heater for externally heating fixing roller
First Claim
1. An image heating apparatus for heating a toner image formed on a recording material, comprising:
- a rotatable member;
heating means for heating an outer peripheral surface of said rotatable member, said heating means including a heater for forming a heating nip portion in cooperation with said rotatable member;
back-up means for forming a conveying nip portion in cooperation with said rotatable member, the conveying nip portion conveying the recording material; and
control means for controlling a temperature of said heater and a rotation of said rotatable member;
wherein said apparatus has a cleaning mode to remove toner from said heating means, wherein said control means, in the cleaning mode, starts energizing said heater to dissipate heat in a condition that said rotatable member stops and afterward stops energizing said heater, and wherein said control means rotates said rotatable member until a part which forms a heating nip portion in a peripheral direction of said rotatable member reaches the conveying nip portion.
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Accused Products
Abstract
The image heating apparatus for heating a toner image formed on a recording material, includes a rotatable member; heating device for heating an outer peripheral surface of the rotatable member, the heating device including a heater for forming a heating nip portion in cooperation with the rotatable member; back-up device for forming a conveying nip portion in cooperation with the rotatable member, the conveying nip portion conveying the recording material; and control device for controlling a temperature of the heater and a rotation of the rotatable member; wherein the apparatus has a cleaning mode to remove toner from the heating device, wherein the control device, in the cleaning mode, starts energizing the heater to dissipate heat in a condition that the rotatable member stops and afterward stops energizing the heater, and wherein the control device rotates the rotatable member until a part which forms a heating nip portion in a peripheral direction of the rotatable member reaches the conveying nip portion. By the virtue of the present invention, it prevents stain caused by the off-set of toner the recording material in an image heating apparatus.
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Citations
12 Claims
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1. An image heating apparatus for heating a toner image formed on a recording material, comprising:
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a rotatable member;
heating means for heating an outer peripheral surface of said rotatable member, said heating means including a heater for forming a heating nip portion in cooperation with said rotatable member;
back-up means for forming a conveying nip portion in cooperation with said rotatable member, the conveying nip portion conveying the recording material; and
control means for controlling a temperature of said heater and a rotation of said rotatable member;
wherein said apparatus has a cleaning mode to remove toner from said heating means, wherein said control means, in the cleaning mode, starts energizing said heater to dissipate heat in a condition that said rotatable member stops and afterward stops energizing said heater, and wherein said control means rotates said rotatable member until a part which forms a heating nip portion in a peripheral direction of said rotatable member reaches the conveying nip portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification