Signature sensing for optimum toner control with donor roll
US5887221A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1997 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | Oct 20, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00042
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Reload characteristics of a development member such as a donor roll are monitored by using a machine exposure system (ROS or LED Bar) to generate a test image composed of a short (in the process direction) high density solid area patch followed by a long mid and lower density areas (solid or halftone), the later corresponding to Reload Defect (RD) exhibited by the development member. Typical dimensions of the test image would be a 15 mm square high density patch followed by a 200.times.15 mm mid and lower density regions. This test image voltage profile is placed in a skipped image frame inserted into a long job, or is effected during cycle-out/down following a shorter job run, and is scheduled at infrequent periodic intervals, for example, every 2000 prints. The resultant developed toner pattern on the photoreceptor is monitored, for example, with a reflectance or transmission density sensor such as the Toner Area Coverage (TAC) sensor used in the 4700.TM., 4850.TM., and 5775.TM. imaging products or an Extended Toner Area Coverage (ETAC) sensor. The toner dispense rate is adjusted to obtain a desired level of Reload Defect in the developed toner patter which corresponds to the opt…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.