Developing device having agitation conveyance member with scraper for wiping toner sensor and image forming apparatus having the developing device
US8995851B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 2014 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Mar 4, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0897
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device includes a developer container, an agitation conveyance member, a toner detection sensor, and a scraper. Agitation conveyance member agitates and conveys a developer in developer container. Toner detection sensor detects a toner concentration or a remaining amount of toner in developer container. Scraper is provided in agitation conveyance member, and cleans a detection surface of toner detection sensor when agitation conveyance member rotates. Scraper includes a first member that comes into contact with detection surface of toner detection sensor when agitation conveyance member rotates forward, and a second member that comes into contact with detection surface of toner detection sensor when agitation conveyance member rotates reversely. First member has a wear resistance higher than that of second member, and a coefficient of friction between second member and detection surface is higher than a coefficient of friction between first member and detection surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.