Fixing device for an image forming apparatus

Details Fixing device for an image forming apparatus Fixing device for an image forming apparatus

1997-03-03

1998-05-26

Moses, R. L.

Electrophotography

Image formation

Fixing

219216, 399335, G03G 1520

Patent

active

057582459

ABSTRACT:
A fixing device (20) for heating and then fixing an unfused toner image onto a sheet substrate includes a first roller (24) and a second roller (28) spaced apart from the first roller. A third roller (26) is arranged between the first and second rollers. A portion of the third roller is protruded across an imaginary line (38) which contacts with outer peripheries of the first and second rollers on the same side thereof into a region (40) in which the first and second rollers are located. A fourth roller (30) is spaced apart from the third roller beyond the first or second roller. A portion of the fourth roller is also protruded across the imaginary line into the region. A heater (36) is mounted for heating the rollers. The sheet (22) is transported with one surface thereof contacted with the first and second rollers while the other surface thereof is contacted with the third and fourth rollers along a sheet path (42) defined by peripheral portions of the four rollers.

REFERENCES:
patent: 4242566 (1980-12-01), Schribner
patent: 4243869 (1981-01-01), Schribner
patent: 4973824 (1990-11-01), Ohashi et al.
patent: 5250998 (1993-10-01), Ueda
patent: 5268559 (1993-12-01), Jacobs
patent: 5349424 (1994-09-01), Dalal et al.
patent: 5359401 (1994-10-01), Uehara et al.
patent: 5410394 (1995-04-01), Wayman et al.
patent: 5436710 (1995-07-01), Uchiyama

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