Method and apparatus for preventing transfer roller from being contaminated in image forming system
US7035570B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 2004 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Jul 13, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00734
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a method and apparatus for preventing a transfer roller from being contaminated by toner in an image forming system, the method comprising determining a size of paper based on a time when front and rear ends of the paper are detected by a paper feeding sensor; comparing a size of an image formed on a photosensitive drum with the size of the paper; and if the size of the paper is the same as or smaller than the size of the image, determining a separation time of a transfer roller from a transfer belt in consideration of a delay time when the transfer roller is mechanically separated from the transfer belt after a separation command is applied to the transfer roller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.