Three-roll fuser with center pressure roll for black and color a

Details Three-roll fuser with center pressure roll for black and color a Three-roll fuser with center pressure roll for black and color a

1993-03-31

1994-03-22

Moses, R. L.

Photocopying

Contact printing

Light boxes

219216, 432 60, 355285, G03G 1520

Patent

active

052969045

ABSTRACT:
A three roll fuser system for a xerographic machine includes a reversibly drivable central pressure roll, a first fuser roll located adjacent the central pressure roll forming a first fuser nip with the central roll, and a second fuser roll located adjacent the central pressure roll on a substantially opposite side of the central pressure roll as the first fuser roll forming a second fuser nip with the central roll. Copy sheets having an unfused image on a side thereof are transported from an inlet through one of the first and second nips to fuse the image on the copy sheet and then transported to an outlet. The three roll fuser system is capable of selectively fusing either side of a copy sheet without requiring extra sheet inverting devices. In a preferred embodiment, the fuser rolls have differing physical properties and can be operated under different operating conditions such as fuser temperature and speed.

REFERENCES:
patent: 3965331 (1976-06-01), Moser et al.
patent: 4147501 (1979-04-01), Goshima et al.
patent: 4444486 (1984-04-01), Monkelbaan
patent: 4716435 (1987-12-01), Wilson
patent: 4791447 (1988-12-01), Jacobs
patent: 4928148 (1990-05-01), Higashi
patent: 4967237 (1990-10-01), Sasaki et al.
patent: 5019869 (1991-05-01), Patton
patent: 5053828 (1991-10-01), Ndebi et al.
patent: 5084731 (1992-01-01), Baruch

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