Image forming apparatus with different potentials in different d

Details Image forming apparatus with different potentials in different d Image forming apparatus with different potentials in different d

1995-03-10

1996-12-24

Brase, Sandra L.

Photocopying

Contact printing

Light boxes

355245, 355271, G03G 1516

Patent

active

055877800

ABSTRACT:
An image forming apparatus has an image bearing member; developing device for developing the image bearing member to form a toner image on the image bearing member, in a developing zone; and a transferring member for forming a nip in cooperation with the image bearing member and for transferring the toner image onto a transfer material in the nip. During a portion of a period in which the transfer material is not in the nip, an electric field is formed for transferring the toner having the same polarity as the toner image from the transferring member to a first region of the image bearing member. A discharging unit is provided for discharging a second region of the image bearing member; wherein a potential of the first region in the developing station is different from a potential of the second region in the developing zone, and a bias voltage applied to the developing unit when the first region is in the developing zone before the generation of the electric field is different from that applied when the second region having been discharged by the discharging unit is in the developing zone.

REFERENCES:
patent: 4843423 (1989-06-01), Nakamura et al.
patent: 5132738 (1992-07-01), Nakamura et al.
patent: 5182604 (1993-01-01), Asai
patent: 5253022 (1993-10-01), Takeuchi et al.
patent: 5287149 (1994-02-01), Hoshika
patent: 5337127 (1994-08-01), Imaue
patent: 5410393 (1995-04-01), Watanabe

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