G - Physics – 03 – G
Patent
G - Physics
03
G
314/18
G03G 15/06 (2006.01) G03G 15/08 (2006.01)
Patent
CA 1250344
REVERSAL IMAGE DEVELOPMENT TYPE ELECTROPHOTOGRAPHIC PRINTING SYSTEM ABSTRACT OF THE DISCLOSURE A reversal image development type electrophoto- graphic printing system including a rotatable drum (1) coated with a light sensitive layer and an image developing roller (31) co-rotatable with the drum and using a printing medium composed of carriers and toner. To prevent superfluous toner during start-up, a prede- termined bias voltage (-VB) differing to a normal bias voltage (+VB) is supplied to the image developing roller and the drum, and the image developing roller, a pre- charger (2), and power supplies (52, 53) for supplying the initial and normal bias voltages are energized in a predetermined start sequence. In addition, to prevent carrier extraction at a stop condition, the drum, the image developing roller, the precharger, and the power supply (53) are deenergized in a predetermined operation stop sequence. A printing medium including a resin toner comprising a mixed resin and magnetized powder and a charge control medium mixed with the resin toner may be used, and prevention of the surplus resin toner extraction in the start-up condition also may be achieved.
511737
Fuji Xerox Co. Ltd.
Mcfadden Fincham
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