Apparatus for controlling temperature of fixing device by increa

Details Apparatus for controlling temperature of fixing device by increa Apparatus for controlling temperature of fixing device by increa

1996-07-26

1998-04-21

Beatty, Robert

Electrophotography

Control of electrophotography process

Responsive to number of copies or passage of time

399 69, G03G 1500

Patent

active

057428654

ABSTRACT:
An apparatus controls a temperature of a heat roller for fixing a developer material transferred on a print medium such as paper. The apparatus includes a controller, a sensor for detecting the thickness and/or width of a print medium such as paper, and a temperature-detecting element such as a thermistor for detecting the temperature on a first surface of the heat roller outside of a second surface area of the heat roller in contact with the print medium. The controller controls the temperature of the heat roller in accordance with the dimension of the print medium so that the middle portion of the heat roller is maintained substantially at a temperature of a first predetermined value during continued printing operation. The controller raises the temperature on the first surface stepwise in accordance with each page of the print medium during continued printing operation till the temperature on the first surface reaches a temperature of a second predetermined value, and maintains thereafter the temperature on the first surface at the second predetermined value during continued printing operation.

REFERENCES:
patent: 4825242 (1989-04-01), Elter
patent: 5331384 (1994-07-01), Otsuka
patent: 5481346 (1996-01-01), Ohzeki et al.
patent: 5486903 (1996-01-01), Kanno et al.
patent: 5512992 (1996-04-01), Kim et al.

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