Photocopying – Contact printing – Light boxes
Patent
1987-12-01
1989-09-26
Grimley, Arthur T.
Photocopying
Contact printing
Light boxes
355302, 355303, 15 15R, 1525651, G03G 2100
Patent
active
048704660
ABSTRACT:
A cleaning device for removing residual toner and paper dust from a photoconductive element of an electrophotographic copier includes a fur brush for removing the residual toner and paper dust in contact with the photoconductive element after the latter has been precharged. Then, a scavenger roller collects the toner and paper dust from the fur brush and, then, a scraper scrapes off the toner and paper dust from scavenger roller. The scavenger roller has surface roughness which is equal to or less than 0.5 .mu.m. An AC voltage is applied to the scavenger roller as a cleaning bias voltage. At least two flickers are provided for shaking off the toner and paper dust from the fur brush together with or independently of the scavenger roller. The fur brush and the scavenger roller are rotated in opposite directions to each other, and the peripheral speed of the scavenger roller is higher than that of the fur brush as measured at their point of contact. A cleaning blade is located at a position downstream of the fur brush so that is constantly scrapes off some amount of toner, whereby a frictional force acting between the cleaning blade and the surface of the photoconductive element is maintained weak enough to eliminate wear and damage.
REFERENCES:
patent: 3572923 (1971-03-01), Fisher et al.
patent: 4297021 (1981-10-01), Tani et al.
patent: 4469435 (1984-09-01), Nosaki et al.
patent: 4506975 (1985-03-01), Shukuri et al.
patent: 4588285 (1986-05-01), Tagoku
Xerox Disclosure Journal, vol. 1, No. 6, Jun. 1976, Friday, Bruce W., "Device for Reducing Fiber Matting in Xerographic Cleaning System", p. 85.
Grimley Arthur T.
Pendegrass J.
Ricoh & Company, Ltd.
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