Electrophotographic printing apparatus capable of printing images by electrophotographic processing and its start-up method
US5404213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1994 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Mar 23, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/50
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
To prevent spurious adherence of toner to the surface of a photosensitive drum during start-up of an electrophotographic printing apparatus, once rotation of the drum and charging of the drum surface to a predetermined potential are initiated, rotation of a developing roller to bring toner into contact with the drum surface is delayed until the charged portion of the drum surface has been rotated around to a position facing the developing roller. Applications of appropriately timed biasing voltages to the developing roller and an image transfer roller are also utilized to prevent spurious toner attraction to the surfaces of the drum and the transfer roller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.