Sheet decurling mechanism and method

Details Sheet decurling mechanism and method Sheet decurling mechanism and method

1990-12-24

1992-01-28

Grimley, A. T.

Photocopying

Contact printing

Light boxes

162271, 355282, 355290, 355311, G03G 2100

Patent

active

050847317

ABSTRACT:
An electrostatographic fusing apparatus includes a sheet decurling mechanism that has a curl indicating device and a pair of selectable sheet decurling nips formed by a set of hard rollers and a soft roller. The curl indicating device predicts the degree of toner particle laydown of a toned image on an image frame from the value of charge on such frame relative to a given standard charge value of charge. A copy sheet receiving toned images from an image frame having a charge value higher than such standard charge value is selectively deflected through a first decurling nip where the soft roller directly contacts the toned image side of such a copy sheet in order to induce therein a convex curl.

REFERENCES:
patent: 4326915 (1982-04-01), Mutschler, Jr.
patent: 4505695 (1985-03-01), Billings
patent: 4627718 (1986-12-01), Wyer
patent: 4632533 (1986-12-01), Young
patent: 4926358 (1990-05-01), Tani et al.
patent: 4952281 (1990-08-01), Akira
patent: 5005050 (1991-04-01), Donivan et al.

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