Electrostatographic reproducing machine
US5260757A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1992 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Sep 2, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/6564
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser printer has a circulating photoreceptor belt 20 and a transfer station 4 at which toner images are transferred from the belt to copy sheets. Each copy sheet is registered, upstream of the transfer station 4, in the nip of registration rolls 12 before being fed to the transfer station. The copy sheet is fed to the registration rolls 12 (which at that time are stationary) by feed rolls 13, 14 which continue to rotate so that a buckle is formed in the sheet to assist in removing any de-skew. When the sheet has been registered, the registration rolls 12 are rotated and, initially, are accelerated to a speed about 20% greater than the normal operating speed. That has the effect of decreasing the amount of buckle in the sheet before the trail end of the sheet reaches the registration rolls. When the buckle has been reduced, the speed of the rolls is reduced to the normal operating level, which is typically about the same as the speed of the photoreceptor belt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.