Positioning apparatus for magnetic brush developing device
US4084542A · kind A · utility
2Cited by
11References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1977 |
| Grant date | Apr 18, 1978 |
| Priority date | — |
| Expiry date | Jun 7, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved magnetic brush developing device mounted adjacent to a photosensitive member has a magnet and a cylinder mounted to rotate around the periphery of the magnet. The magnet is stationary during operation of the device, but the magnet is mounted so that its position relative to the photosensitive member can be changed each time a predetermined number of copies has been made. This arrangement solves two problems caused by developer which has deteriorated from use, the problems being (1) poor reproduction of a low contrast image, and (2) staining the background of an image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.