Virgin toner and used toner supply apparatus and method
US4260073A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1978 |
| Grant date | Apr 7, 1981 |
| Priority date | — |
| Expiry date | Aug 23, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S222/01
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrophotographic apparatus of the two-component, dry developer and reusable photoconductor type, having a developer unit, and replenisher for supplying toner to the developer unit. The replenisher includes a first supply of virgin toner, and a second supply of used toner. A toner feed device operates to simultaneously feed toner to the developer unit from the first and second replenisher supplies. The proportion of toner fed from the first and second supplies is variable; however, such proportion requires that virgin toner must always be fed. Used toner is provided by collecting toner at the apparatus' cleaning station. Toner-low indication is provided for only the first supply, so as to prevent the feeding of only used toner. A toner concentration sensor signals the need to feed the combination of virgin/used toner to the developer unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.