US 8,913,936 B2Granted

Image heating apparatus and image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorsShigeaki Takada, Osamu Sugino, Teppei Nagata

Life of this patent

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Abstract

An inner heating member is disposed in contact with an inner circumferential surface of a heating belt and an outer heating member is disposed in contact with an outer circumferential surface of the heating belt to heat the heating belt. A restricting member configured to restrict an orbit of the heating belt is disposed between the inner and outer heating members. Then, at least either one of an area of contact between the inner circumferential surface of the heating belt and the inner heating member and an area of contact between the outer circumferential surface of the heating belt and the outer heating member is changed to quickly change a quantity of heat applied to the outer circumferential surface or inner circumferential surface of the heating belt.

Claims13

Dependent claims

An image heating apparatus, comprising:

an endless heating belt configured to heat an image formed on a recording medium;
an inner heating member that is disposed at an inner side of the endless heating belt and is in contact with an inner circumferential surface of the heating belt to heat the heating belt;
an outer heating member that is disposed at an outer side of the endless heating belt and is in contact with an outer circumferential surface of the heating belt to heat the heating belt;
a restricting member disposed between the inner and outer heating members to restrict an orbit of the heating belt;
and
a moving mechanism configured to move at least one of the inner heating member, the outer heating member, and the restricting member to change at least either one of an area of contact between the heating belt and the inner heating member and an area of contact between the heating belt and the outer heating member.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/790,859Filed 8 Mar 2013
Priority: JP 2012-09197313 Apr 2012
Published: US 2013/0272759 A117 Oct 2013
Granted: 16 Dec 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G03G 15/2053
Using contact heat: structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
G03G 15/2017
Using contact heat: structural details of the fixing unit in general, e.g. cooling means, heat shielding means
G03G 2215/2032
The fixing nip having a rotating belt support member opposing a pressure member: the belt further entrained around additional rotating belt…
G03G
Electrography