Developing device and image forming apparatus with intermediate roller for assuring efficient circulation of developer
US8175503B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2009 |
| Grant date | May 8, 2012 |
| Priority date | — |
| Expiry date | Nov 27, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0802
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device is provided with a developing roller arranged to face a photoconductor for forming an electrostatic latent image and adapted to supply a toner to the photoconductor, an agitating member for agitating a developer, a supply roller that holds the developer agitated by the agitating member, and supplies the toner to an area facing the developing roller; a restricting member for blocking the developer supplied onto the supply roller and restricting the amount of the developer conveyed by the supply roller, and an intermediate roller including a first magnetic pole facing in a direction toward the staying developer by being restricted by the restricting member for attracting the staying developer and arranged at such a position as to face the developer blocked by the restricting member. Thus, the developing device can avoid image quality deterioration even when a developing process continues over a long period of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.