Sheet pre-transfer device
US6055409A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1998 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Dec 18, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/1665
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.