Developing device and image forming apparatus therewith
US9835979B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 2016 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Aug 5, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0833
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device includes a developing container, a first stirring member, a second stirring member, and a developer discharge port. The developing container has a first and a second transport chamber. The first stirring member has a rotary shaft and a first helical blade. The second stirring member has a rotary shaft and a second helical blade. Through the developer discharge port, surplus developer inside the developing container is discharged. On the second stirring member, a restricting portion for restricting movement of developer toward the developer discharge port is formed downstream of the second helical blade. The restricting portion has two or more turns of a restricting blade wound in the direction opposite to the second helical blade, and the restricting blade has an increasingly large outside diameter from upstream to downstream with respect to the developer transport direction inside the second transport chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.