Electrophotographic developer with carrier overflow control
US4161923A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1977 |
| Grant date | Jul 24, 1979 |
| Priority date | — |
| Expiry date | Dec 22, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic-brush developer for use in an electrophotographic machine wherein the magnetic brush is used to transport toner-coated carrier particles to an elevated development zone from a pickup zone. A path for so moving the carrier is provided between the magnetic brush roll and an overflow plate, the lower end of which also serves as a doctoring blade. The carrier is moved to the top of the roll where a doctoring blade limits the amount of carrier entering the development zone. Excess carrier is accumulated in an expanded spatial area near the doctoring blade and returned to the vicinity of the pickup zone by falling back between the overflow plate and the housing. An area is provided near the doctoring blade at the top of the roll where no magnetic field is present. The overflow plate is made of non-magnetic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.