Sheet pre-transfer device

Details Sheet pre-transfer device Sheet pre-transfer device

1998-12-18

2000-04-25

Grimley, Arthur T.

Electrophotography

Document handling

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271251, G03G 1500, B65H 916

Patent

active

060554096

ABSTRACT:
A pretransfer sheet feeding device for an electrophotographic printing machine that minimizes impact with and delivers a sheet to a photoreceptor at a desired tangential position. The sheet feeding device includes a selectively engageable drive nip and a biased baffle member which forms a buckle chamber. There is further a plurality of rollers located so as to provide substantially frictionless directional guidance to the sheet while also inducing a predetermined bend to the sheet so as to deliver the sheet to the photoreceptor. The pretransfer rollers are also moveable so that the angle of approach of a sheet can be adjusted based on sheet weight or other characteristics. Once the sheet is tacked to the photoreceptor in the transfer zone, the disengageable drive nip is released and the sheet is controlled by the photoreceptor so that speed mismatch is not a problem.

REFERENCES:
patent: 4938468 (1990-07-01), Wafler
patent: 5156392 (1992-10-01), Wong et al.
patent: 5311267 (1994-05-01), Bean
patent: 5697608 (1997-12-01), Castelli et al.

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