Photocopying – Contact printing – Light boxes
Patent
1995-06-07
1996-04-30
Moses, R. L.
Photocopying
Contact printing
Light boxes
355259, G03G 2114, G03G 1506
Patent
active
055129811
ABSTRACT:
In an electrophotographic reproduction machine including an image bearing member, latent image devices for forming on the image bearing member electrostatic latent images having a first polarity, and a hybrid development unit for applying to the latent images correct-sign toner particles having a second polarity relatively opposite to the first polarity, a method of automatically purging from the hybrid development unit wrong-sign toner particles having a third polarity relatively the same as the first polarity. The purging method includes the steps of counting and accumulating a number of image forming events performed by the reproduction machine for comparing to a stored predetermined number of such events, and of changing relative electrical bias values for a magnetic roll and for a donor roll within a housing of the development unit from imaging bias values to wrong-sign toner purging bias values so as to cause wrong-sign toner particles to transfer from the magnetic roll to the donor roll. The method also includes the steps of producing an electrostatic field on the image bearing member for causing wrong-sign toner particles to transfer from the donor roll to the image bearing member, and operating a cleaning device in contact with the image bearing member for removing wrong-sign toner particles from the image bearing member.
REFERENCES:
patent: 5255062 (1993-10-01), Oka et al.
patent: 5322970 (1994-06-01), Behe et al.
patent: 5359399 (1994-10-01), Bares et al.
Moses R. L.
Nguti Tallam I.
Xerox Corporation
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