Heat-fixing device having a roller selectively loaded through an

Details Heat-fixing device having a roller selectively loaded through an Heat-fixing device having a roller selectively loaded through an

1991-05-09

1992-05-05

Grimley, A. T.

Photocopying

Contact printing

Light boxes

100171, 219216, 355290, G03G 1520

Patent

active

051112507

ABSTRACT:
A heat-fixing device for heating a toner image on a sheet-like member includes a rotatable heating roller for heating the sheet and a rotatable pressing roller for pressing the sheet-like member against the heating roller, the longitudinal axis of one of the heating roller and the pressing roller being fixed to a frame and the longitudinal axis of the other roller being not fixed to the frame. A guide arm swingable on a swing axis fixed to the frame and supporting the other roller is provided at a position distant from the swing axis to guide the movement of the other roller in relation to the fixed roller, and a moving arm and an elastic element arranged between the guide arm and the moving arm are also provided so that the moving arm drives the guide arm through the elastic element to press the sheet-like member between the heating roller and the pressing roller. An internal groove-cam follower surface in the moving arm enables the pressing force between the heating roller and the pressing roller to be adjusted in accordance with a movement of the moving arm when the pressing roller and the heating roller are in contact with each other.

REFERENCES:
patent: 4168424 (1979-09-01), Kasahara et al.
patent: 4428660 (1984-01-01), Matsumoto
patent: 4473290 (1984-09-01), Iwao
patent: 4963941 (1990-10-01), Negishi et al.
patent: 5017970 (1991-05-01), Sakata
patent: 5023667 (1991-06-01), Negoro et al.

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