Xerographic charging

Details Xerographic charging Xerographic charging

1979-09-04

1981-07-14

Braun, Fred L.

Photocopying

Including fiber optics

250325, 355 3R, 361229, G03G 1500

Patent

active

042783429

ABSTRACT:
A xerographic device having a reusable photoconductor which is subjected in repeating cycles to (1) a charge corona whereat the photoconductor is uniformly charged to a negative voltage, (2) an imaging station whereat a working portion of the photoconductor is selectively discharged, to leave a charged area on this working portion defining a negative electrostatic latent image to be reproduced on copy paper, (3) a magnetic brush developing station whereat negatively charged carrier beads transport positively charged toner to the photoconductor's latent image, to leave a toned image on the photoconductor, (4) a transfer station, including a negative transfer corona, whereat a portion of the photoconductor's toned image is transferred to copy paper, (5) a positive preclean corona whereat the negatively charged photoconductor and its positive residual toner are subjected to a positive charge, and (6) a cleaning station whereat the photoconductor is cleaned by a brush having an affinity for positively charged particles. The charge corona spans a greater width of the photoconductor than does the developing station. The charge corona and the transfer corona span a lesser width of the photoconductor than the preclean corona.

REFERENCES:
patent: 2832977 (1958-05-01), Walkup et al.
patent: 3610749 (1971-10-01), Madrid
patent: 3647293 (1972-03-01), Queener
patent: 3700328 (1972-10-01), Davidge et al.
patent: 3728016 (1973-04-01), Harbour et al.
patent: 3834804 (1974-09-01), Bhagat et al.
patent: 3982830 (1976-09-01), Daniels et al.
patent: 4133610 (1979-01-01), Bernardelli et al.

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