Pressure roller having deflection compensating shaft

Details Pressure roller having deflection compensating shaft Pressure roller having deflection compensating shaft

1996-04-03

1998-03-24

Ramirez, Nestor R.

Electrophotography

Image formation

Fixing

399406, G03G 1520

Patent

active

057323194

ABSTRACT:
A heat roller fixing device which can substantially make uniform the amount of deflection of a backup roller over the axial length thereof to improve a paper feed force at an axially central portion of the backup roller. The heat roller fixing device includes a heat roller rotatably mounted to a frame, and a backup roller pressed against a heat roller by coil springs to follow rotation of the heat roller. The backup roller includes a hollow cylinder, a solid metal shaft inserted in the hollow cylinder and having a pair of large-diameter portions spaced a given distance from each other. One of the large-diameter portions of the solid metal shaft is fixed to the hollow cylinder such as by a pin therethrough, and the solid metal shaft is biased toward the heat roller by the coil springs.

REFERENCES:
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patent: 4042804 (1977-08-01), Moser
patent: 4253392 (1981-03-01), Brandon et al.
patent: 4487122 (1984-12-01), George et al.
patent: 4501483 (1985-02-01), Romansky et al.
patent: 4942434 (1990-07-01), Nakai et al.
patent: 5195430 (1993-03-01), Rise
patent: 5467178 (1995-11-01), Mui et al.

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