Heated fuser roll

Details Heated fuser roll Heated fuser roll

1981-10-09

1982-12-21

Prescott, A. C.

Electric heating

Heating devices

Combined with diverse-type art device

219469, 355 14FU, 355 3FU, G03G 500, H05B 102

Patent

active

043651399

ABSTRACT:
A heated fuser roll for use in a fuser apparatus for fixing toner images to a support surface is disclosed. The fuser roll includes a sleeve member having two heating units positioned within the member. Each heating unit includes a plurality of heating elements formed of a semiconducting ceramic material having a positive temperature coefficient of resistivity and exhibiting a Curie temperature transition point at which the resistance of the material increases with increasing temperature. The heating units are separated from each other by an insulating member. The fuser includes a thermally sensitive switch for controlling power to the heating elements when starting the fuser from a cold state. The switch is adapted to electrically connect the heating units in series when power is first applied to the fuser and then electrically connect the heating units in parallel when the heating elements are heated to the Curie temperature.

REFERENCES:
patent: T100804 (1981-07-01), Ernst
patent: 4075455 (1978-02-01), Kitamura et al.
patent: 4113375 (1978-09-01), Murata et al.
patent: 4114023 (1978-09-01), Zelinka et al.
patent: 4161644 (1979-07-01), Yanagawa et al.
patent: 4253007 (1981-02-01), Dannatt
patent: 4266115 (1981-05-01), Dannatt
patent: 4329566 (1982-05-01), Hooper

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