Toner layer forming device
US4799086A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1987 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Feb 11, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0921
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner layer forming device for an electrostatic image reproduction machine having a photosensitive latent image carrier includes a fixed magnet including a plurality of spaced poles of opposite polarity; a non-magnetic sleeve including a developing surface rotatable about the magnet for carrying a thin layer of toner particles and for transferring a portion of the layer to the carrier; a toner supply device for supplying a layer of toner particles onto the surface of the sleeve; a pretrimmer for reducing the thickness of the layer of toner supplied to the sleeve by the supply device upon rotation of the sleeve; and a restriction member braced against the surface of the sleeve for frictionally charging the toner particles on the surface, and for further reducing the thickness of the toner layer to a predetermined value for transfer to the carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.