Electrostatographic reproduction machine having dual mode development unit control apparatus and method
US6134398A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1998 |
| Grant date | Oct 17, 2000 |
| Priority date | — |
| Expiry date | Dec 22, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0174
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and apparatus in an electrostatographic reproduction machine having a plurality of development units for reliably producing high quality toner particle images under varying sustained area toner coverage conditions. The apparatus employing the method includes a control system (a) for reading a stored area toner coverage level threshold value; a first operating time control algorithm and a second operating time control algorithm for adding and admixing in each development unit of the plurality of development units; (b) for measuring sustained area toner coverage levels of images being reproduced during a reproduction job; (c) for comparing the measured sustained area toner coverage levels of images being reproduced with the stored area toner coverage level threshold value; and (d) for changing the operating time control algorithm for adding and admixing in each development unit between the first operating time control algorithm and the second operating time control algorithm depending on a result of comparing the measured sustained area toner coverage levels of images being reproduced with the stored threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.