Electrophotography – Control of electrophotography process – Of plural processes
Patent
1997-10-20
1999-03-23
Brase, Sandra
Electrophotography
Control of electrophotography process
Of plural processes
399 27, G03G 1500
Patent
active
058872213
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 optimum level of Toner Concentration in the development system.
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Brase Sandra
Xerox Corporation
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