Electrophotographic apparatus
US4257700A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1979 |
| Grant date | Mar 24, 1981 |
| Priority date | — |
| Expiry date | Apr 16, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/167
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The electrophotographic apparatus for forming one or more copies of a document has a photosensitive drum rotatably arranged for forming an electrostatic charge latent image and a developing device for developing the latent image into a toner image. A transfer roller is rotatably arranged for transferring the toner image onto a record paper which is supplied between the drum and transfer roller. A pair of arms are provided each of which rotatably support a respective end of a shaft of the transfer roller through a bearing and which is slidably inserted in a recess formed in respective arms in a radial direction of the drum. Furthermore, a pair of coiled springs are each respectively provided on the respective arms and surround the bearings in such a manner that the transfer roller is forced resiliently to displace toward the drum. The arms move between first and second positions and in the first position the transfer roller is urged against the drum under a given pressure by the coiled springs, while in the second position the transfer roller is separated from the drum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.