In a test cycle, either at the end of a short copy production run or during an interruption in a longer copy production run, a xerographic copier is arranged to produce a toned test patch (30) in an otherwise cleaned imaging area (28) of the photoconductor (26). The optical density of both the cleaned and test areas are sensed by an electro-optic system to provide output signals indicating the respective densities. These signals are compared in a control circuit primarily to provide output signals indicating requirement for replenishment of the developer mix with toner.
申请公布号
DE2960963(D1)
申请公布日期
1981.12.24
申请号
DE19792960963
申请日期
1979.03.09
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
WILSON, CLEMENT CARD;VAN CLEAVE, GEORGE WILLIAM;ERNST, LARRY MASON;SEIGAL, STEVEN DAVID;CHAMPION, JAMES ROBERT