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US 5,493,380 AGranted
Fixing device with means for limiting a distance between heating and pressing member
AssigneeCanon Kabushiki Kaisha
InventorsTooru Saitou, Akio Nemoto, Koichi Tanigawa, Jun Saito, Yuzo Isoda, Katsuhiko Nishimura
Life of this patent
Estimating the term…
Abstract
In a fixing device, a limitation member for preventing the center distance between a heating member and a shaft of a pressing roller from being reduced does not limit the center distance in an initial state of the device, and prevents a further decrease in the distance when the distance is reduced. It is thereby possible to suppress an increase in the width of a nip portion provided between the heating member and the pressing roller, and to prevent a failure in fixing.
Claims10
A fixing device comprising:
- a heating member;
- a pressing roller for forming a nip with said heating member, said pressing roller mounted on a shaft;
- urging means for urging together said heating member and said pressing roller to an initial relative position at which said heating member and the shaft of said pressing roller are separated by an initial distance;
- and
- limitation means for preventing relative movement between said heating member and the shaft of said pressing roller by said urging means beyond a second relative position at which said heating member and the shaft of said pressing roller are separated by a second distance that is less than the initial distance.
2 more elements
Dependencies are inferred from the claim text.