Image forming apparatus having sheet curvature correcting device

Details Image forming apparatus having sheet curvature correcting device Image forming apparatus having sheet curvature correcting device

1996-10-02

1998-07-28

Royer, William J.

Electrophotography

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271188, 399406, G03G 1500

Patent

active

057873305

ABSTRACT:
A sheet S is supported by a movable cylindrical transfer drum 12 and a toner image is transferred from a photosensitive drum 9 onto the sheet S in this state. The sheet S is curved by curl rolls 29, 30 of a conveyer unit 20 so that it is curved outward in harmony with the direction of the transfer drum 12 and that its curvature radius is smaller than that of the transfer drum 12. Then the sheet S is conveyed toward the transfer drum 12. A guide plate 40 is placed between the curl rolls 29, 30 and the transfer drum 12 and the leading end portion of the sheet S conveyed from the curl rolls 29, 30 abuts and slides on the guide face 42 of the guide plate 40. Thus, a moment is given to the following portion of the sheet S held between the curl rolls 29, 30 and the curvature radius of the following portion thereof is corrected so that the curvature radius of the following portion thereof may be increased.

REFERENCES:
patent: 5113226 (1992-05-01), Tadokoro et al.
patent: 5442429 (1995-08-01), Bartholmae et al.
patent: 5565970 (1996-10-01), Suda
patent: 5602636 (1997-02-01), Matsuzawa

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