Reversal image development type electrophotographic printing sys

Details Reversal image development type electrophotographic printing sys Reversal image development type electrophotographic printing sys

1986-06-18

1987-12-22

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3R, 355 3DD, 355 14D, 355 14CH, 430122, G03G 1500, G03G 1508

Patent

active

047149426

ABSTRACT:
A reversal image development type electrophotographic 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 predetermined 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 precharger (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.

REFERENCES:
patent: 3805739 (1974-04-01), Feldeisen et al.
patent: 4072415 (1978-02-01), Inoue et al.
patent: 4337306 (1982-06-01), Kanbe et al.

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