Hybrid scavengeless development using an apparatus and a method

Details Hybrid scavengeless development using an apparatus and a method Hybrid scavengeless development using an apparatus and a method

1998-10-02

2000-04-11

Beatty, Robert

Electrophotography

Image formation

Development

399 99, G03G 1508

Patent

active

06049686&

ABSTRACT:
A developer unit for developing a latent image recorded on an image receiving member with marking particles, to form a developed image. A donor member is spaced from the image receiving member and adapted to transport marking particles to a development zone adjacent the image receiving member. An electrode is positioned in the development zone between the image receiving member and the donor member. A voltage supply is provided for electrically biasing the electrode during a developing operation with an alternating current bias to detach marking particles from the donor member, forming a cloud of marking particles in the development zone, and developing the latent image with marking particles from the cloud. The voltage supply periodically electrically biases the electrode during a cleaning operation with a direct current bias and with a alternating current bias so that toner is effectively removed from the wire. The bias levels are chosen to reduce field induced redeposition of right or wrong sign toner.

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patent: 5761578 (1998-06-01), Cousoulis et al.
patent: 5848327 (1998-12-01), Badesha et al.

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