Image forming apparatus with transfer current controller and met

Details Image forming apparatus with transfer current controller and met Image forming apparatus with transfer current controller and met

1998-01-12

1999-04-13

Moses, Richard

Electrophotography

Control of electrophotography process

Of plural processes

399 66, 399297, G03G 1500, G03G 1516

Patent

active

058936599

ABSTRACT:
This invention relates to an image forming apparatus with a transfer unit for transferring toner electrically to an electrostatic latent image formed on a photoreceptor onto a copy sheet. The image forming apparatus has a transfer electrode charge supply means for supplying electric charges to a transfer electrode provided in the transfer unit to electrically attract the toner onto the copy sheet and control means for controlling the quantity of electric charges to be supplied to the photoreceptor via the transfer electrode from the transfer electrode charge supply means based on a photoreceptor inflow current flowing to the photoreceptor through the charge send/receive means and on a photoreceptor outflow current flowing out from the photoreceptor through a ground wire connecting the photoreceptor and the ground. The charge send/receive means, other than the transfer unit, sends and receives electric charges to and from the photoreceptor. With this arrangement, variation of photoreceptor inflow current due to image density variation of an original document can be controlled to perform a stable image transfer.

REFERENCES:
patent: 4643561 (1987-02-01), Folkins
patent: 5515146 (1996-05-01), Harasawa et al.

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