Electrophotography – Control of electrophotography process – Control of developing
Patent
1998-10-02
1999-12-21
Brase, Sandra
Electrophotography
Control of electrophotography process
Control of developing
399 29, G03G 1506
Patent
active
060060484
ABSTRACT:
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 relative 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 detecting apparatus adjacent the image bearing member for sensing toner particles developed into non-image regions. The development unit includes a first biasing means including a DC power supply for biasing a magnetic roll mounted within the housing of the hybrid development unit. A second biasing means includes a second DC power for biasing a donor roll mounted which forms a toner transfer nip with the magnetic roll. The DC power supplies is adjusted so that "wrong sign" toner of said first polarity are attracted to the donor roll from the magnetic brush within the housing of the hybrid development unit. An electrostatic field is produced between the image bearing member and the donor roll having a wrong-sign toner thereon. The wrong sign toner is attracted to the image bearing member; and a sensor senses wrong-sign toner on said image bearing member.
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Beali Lloyd F.
Brase Sandra
Xerox Corporation
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