Browse Prior Art Database

Original Publication Date: 1990-Aug-31
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal


Toner usage in electrophotographic printing machines may be quantified by integrating the value given by a current sensing device to measure the charge on dispensed toner. The dispensed toner charge is proportional to given toner mass. The current sensing device is mounted on a developer housing in close proximity to the toner mass deposited on a photoreceptor. A controlled mass of toner is dispensed, the charge measured and the charge to mass ratio is stored in memory as a control reference. The charge to mass reference value is equated with the sum total of dispensed toner charge. When the theoretical limit of the toner dispenser is approached a signal alerts an operator to refill the dispenser. A related scheme may be used to monitor waste toner receptacles.