Developing device and image forming apparatus
US10859948B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2019 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Oct 22, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0827
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device includes a developer tank holding a developer, and a transporting member stirring and transporting the developer. The transporting member includes first and second screws each provided with a rotary shaft having a spiral blade disposed on an outer circumferential face of the rotary shaft. The first and second screws are disposed such that the rotary shafts are parallel to each other. The developer tank includes a first compartment accommodating the first screw, a second compartment accommodating the second screw, a partition separating the first compartment and the second compartment, and a circulation zone. The circulation zone includes an opening in the partition that allows the developer to flow through. The first and second compartments have bottom faces at different heights. A protrusion is formed on a bottom face in the circulation zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.