Image forming apparatus having clamp for conveying a recording medium
US5521679A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1993 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | Nov 18, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus for electrostatically transferring a latent image formed on a photoconductive drum or similar image carrier to a recording medium held by a clamp drum or similar medium conveying member. The clamp drum has a cylinder or base made of aluminum, a conductive rubber layer covering the cylinder, and an overcoat layer covering the rubber layer and higher in electric resistance than the rubber layer. A bias voltage for latent image transfer is applied while the rubber layer is connected to ground. The photoconductive drum and clamp drum are pressed against each other by a predetermined force, the former following the rotation of the latter. The photoconductive drum is provided with a photoconductor having a great electrostatic capacity, thereby preventing the effective transfer voltage at the time of image transfer from increasing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.