Developing device with regulated developer supply
US4624545A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1983 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Oct 14, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0914
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A device is provided for developing an electrostatic latent image formed on an image bearing member with a developer comprised of magnetically attractable, electrically insulating toner particles for developing the latent image by applying the toner particles in the form of a thin film uniform in charge and thickness. The developing device generally comprises a developing sleeve, which is driven to rotate to carry thereon toner particles, and a pressure plate is held in pressure contact with the sleeve to thereby form a thin film of charged toner particles on the sleeve upstream of the developing station. In one aspect of the present invention, the pressure plate has a low hardness or relatively easily wearable region which is in pressure contact with the sleeve so as to prevent toner particles from permanently sticking to the pressure plate. In another aspect, the pressure plate is structured to have a locally defined relatively easily deflectable region which is in pressure contact with the sleeve. In a further aspect, the pressure plate is movable with respect to the sleeve to thereby remove stuck toner particles from the pressure plate and from the sleeve. In a still further as…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.