Sheet curl control device for a duplex copier

Details Sheet curl control device for a duplex copier Sheet curl control device for a duplex copier

1997-05-14

1999-05-18

Royer, William

Electrophotography

Document handling

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271161, 399401, 399406, G03G15/00

Patent

active

059059346

ABSTRACT:
An apparatus has a first conveyor for conveying a recording medium into an image forming unit which forms an image on a recording medium, a second conveyor for re-conveying the recording medium having an image formed thereon by the image forming unit to the second conveyor, and a curl straightener, formed by a plurality of rollers forming a bent path within the second conveyor, for straightening the curl on the recording medium. The conveyance speed of the second conveyor is switchable between a first speed equal to the conveyance speed of the first conveyor and a second speed which is greater than the first speed. The first speed is the speed of the recording medium until at least a predetermined length of the recording medium passes the curl straightener, and the second speed is the speed of the recording medium after passage therethrough. When image formation is performed in either two-side image forming mode of multiplex mode, it is possible to increase productivity during image formation by allowing the recording medium with the image to take a sufficient time to pass the curl straightener and thereafter re-conveying the recording medium at a higher speed to the image forming section.

REFERENCES:
patent: 4568169 (1986-02-01), Wada et al.
patent: 5086320 (1992-02-01), Koike
patent: 5270778 (1993-12-01), Wyer
patent: 5307133 (1994-04-01), Koshimizu et al.
patent: 5515152 (1996-05-01), Kuo
patent: 5572308 (1996-11-01), Suda et al.
European Patent Office Communication and European Search Report.

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