Apparatus for biasing the curvature of an image carrier on a transfer drum
US5398107A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1993 |
| Grant date | Mar 14, 1995 |
| Priority date | — |
| Expiry date | Nov 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00704
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrophotographic print engine includes a photoconductor drum (20) that interfaces with a transfer drum (48) to form a transfer nip therebetween. Paper is disposed in a paper feed path (242) for traversal through the nip between two precurl rollers (242) and (244). The durometers of the two rollers (242) and (244) are different, such that one roller will cause the other to compress. This causes the paper to have a curvature bias in the direction of the curvature of the drum (48). The paper is then fed into an attachment nip formed between an attachment roller (198) and the drum (48). The paper is adhered thereto by electrostatic forces with the curvature of the paper allowing smaller forces to be utilized. In a multi-color print operation, the paper is maintained on the drum (48) for a number of passes until all images have been transferred thereto from the drum (20). A picker (248) then extracts the paper from the drum (48) and feeds it into a fuser mechanism. The fuser mechanism has two rollers (256) and (258) which apply a curvature bias in the opposite direction to that provided by the precurl rollers (244) and (246) to return the paper to a substantially planar conformati…
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