Color image forming apparatus having bias controller for cleaning transfer roller
US5689771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1996 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | Feb 23, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/1652
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A color toner image forming apparatus comprises a transferring roller having an average cell diameter of 1 .mu.m to 300 .mu.m to transfer a toner image from a photoreceptor drum to a sheet. During the transferring operation, the electric bias member applies onto the transferring roller an opposite electric bias of a constant current having the opposite electric polarity to that of the toner image, and during a cleaning operation to shift toner adhered on the transferring member to the photoreceptor, the electric bias member applies onto the transferring member alternately an identical electric bias of a constant voltage having the identical electric polarity with that of the toner image and an opposite electric bias of a constant current having the opposite electric polarity to that of the toner image six times or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.