Electrophotographic copier and charging means used therefor

Details Electrophotographic copier and charging means used therefor Electrophotographic copier and charging means used therefor

1993-04-21

1995-03-14

Grimley, A. T.

Photocopying

Contact printing

Light boxes

361225, G03G 1502

Patent

active

053981022

ABSTRACT:
The invention is directed to an apparatus for an electrophotographic process, equipped with a charging device of a contact type using a conductive roller or brush, and the charging device used therefor. The apparatus is characterized in the following constructions: roll-shaped fiber aggregation that is rotated in contact with the photoconductive surface through a spacing member; use as applied voltage to the fiber aggregation of periodically oscillating voltage having a lower limit exceeding the surface potential of the photoconductor in the aforementioned device; a brush-type charger that is vibrated while contacted with the photoconductor surface and regulated as required; a fiber roll-type charger wherein ventilation holes are disposed on the roller substrate surface; the fiber roll-type charger with holes further including a closed container with exhausting means enclosing the charger; set-up of a product of planting fiber intervals on a fiber roller and a peripheral velocity ratio of the photoconductor to the roller such that the product is smaller the average particle size of the developer used; changing application voltage to a charger roller depending transfer-treated portion or portions otherwise on the photoconductor surface; and provision of dirt preventer, aligned with the longitudinal direction to the charging roller with conductive fiber, and shiftable between contact and spaced position.

REFERENCES:
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patent: 4371252 (1983-02-01), Uchida et al.
patent: 4455078 (1984-06-01), Mukai et al.
patent: 4457615 (1984-07-01), Seanor
patent: 4547060 (1985-10-01), Lindbald
patent: 4706320 (1987-11-01), Swift
patent: 4761709 (1988-08-01), Ewing et al.
patent: 5012282 (1991-04-01), Wanou et al.
patent: 5146280 (1992-09-01), Kisu
patent: 5221946 (1993-06-01), Kohyama
patent: 5245386 (1993-09-01), Asano et al.
Patent Abstracts of Japan, vol. 10, No. 64 (p. 436), Mar. 14, 1986.
Patent Abstracts of Japan, vol. 9, No. 72 (p. 345), Apr. 2, 1985.

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