Bias voltage control for electrophotocopier magnetic brush

Details Bias voltage control for electrophotocopier magnetic brush Bias voltage control for electrophotocopier magnetic brush

1980-02-01

1981-09-01

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3DD, 355 3CH, 355 14CH, G03G 1500

Patent

active

042868661

ABSTRACT:
An improvement in an electrophotocopying machine utilizing a two component developer material and having a reciprocating carriage for carrying an original document across the illuminating means, an endless, reusable photoconductor, the photoconductor rotating through two cycles for each copy produced of an original document and having a seam extending across the width thereof and a total length less than the length of the document to be imaged and the length required for the physical location of all the photocopying process elements other than the transfer apparatus, a corona device for discharging electrical charge that may remain on the photoconductor after the developed image has been transferred from the photoconductor, a magnetic brush developing device for developing the latent image on the photoconductor and removing untransferred developer material from the photoconductor, and a common source of internally generated voltage for both the discharging corona and the magnetic brush developing device bias voltage, wherein the bias voltage for the magnetic brush developing device is terminated when the voltage to the discharging corona is terminated. The improvement, an arrangement of electrical components, reduces the non-uniformity of the charge deposited on the photoconductor to thereby increase the functional life of the photoconductor while substantially maintaining the bias voltage during interruption of voltage to the discharging corona.

REFERENCES:
patent: 4192604 (1980-03-01), Koyama
patent: 4194828 (1980-03-01), Holz et al.

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