Image forming apparatus having cleaning device of pre-secondary transfer discharge unit
US8135302B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2008 |
| Grant date | Mar 13, 2012 |
| Priority date | — |
| Expiry date | Nov 17, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0135
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus including a primary transfer unit to transfer toner images of plural colors on image carriers onto an intermediate transfer member; a secondary transfer unit to transfer the toner images onto a transfer material; and a pre-secondary transfer discharge unit to discharge charges of the toner images, wherein the discharge unit includes a scorotron having a grid electrode and a discharging electrode; an opposing electrode opposed to the grid electrode through the intermediate transfer member; a first voltage unit to apply a reverse polarity voltage of the toner images to the discharging electrode; a second voltage applying unit to apply a same polarity voltage of the toner images to the grid electrode; a cleaning unit of the grid electrode; a current detecting unit; and a controller to control a timing to clean the grid electrode according to the detected current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.