Photocopying – Contact printing – Light boxes
Patent
1992-07-09
1994-07-19
Grimley, A. T.
Photocopying
Contact printing
Light boxes
219216, 355285, G03G 1520
Patent
active
053313844
ABSTRACT:
In an image forming apparatus including a fixing device for heating and fixing a toner image on a recording material, a temperature detector for detecting the temperature of the surface of a fixing roller is provided substantially outside a passing region of the recording material on the fixing roller. The temperature at a central portion of the surface of the fixing roller is always maintained at a fixing temperature which is most suitable, irrespective of the width size of the recording material to be fixed. Furthermore, when sheets of recording material are continuously fed and fixed, the temperature at an end portion of the fixing roller, provided with the temperature detector is changed in accordance with the number of sheets to maintain the central portion of the fixing roller always at a temperature which is most suitable. Thus, it is possible always to perform image formation having an excellent quality.
REFERENCES:
patent: 3832524 (1974-08-01), Takiguchi
patent: 4348102 (1982-09-01), Sessink
patent: 4434353 (1984-02-01), Marsh et al.
patent: 4719489 (1988-01-01), Ohkubo et al.
patent: 4801968 (1989-01-01), Kogure et al.
patent: 4825242 (1989-04-01), Elter
patent: 4933724 (1990-06-01), Sugimoto et al.
Beatty Robert
Canon Kabushiki Kaisha
Grimley A. T.
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