System for removing foreign matter on photosensitive body or dev

Details System for removing foreign matter on photosensitive body or dev System for removing foreign matter on photosensitive body or dev

1992-05-12

1994-01-11

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355296, G03G 2100

Patent

active

052786218

ABSTRACT:
A system for removing foreign matter on a photosensitive body or a developer carrying body in an image forming apparatus, in which a foreign matter removing unit 11 is arranged between a discharge lamp 7 and a transfer drum 9, the foreign matter removing unit 11 having a rotatable cylindrical electrode 11a that closely confronts a photosensitive body 2 at a predetermined distance. A high-voltage sinusoidal wave generator 12 whose frequency, dc component potential, and effective potential are variable is connected to the cylindrical electrode 11a. An ac electric field is generated between the cylindrical electrode 11a and the photosensitive body 2 by the high-voltage sinusoidal wave generator 12 and aggregates of toner particles whose size is larger than that of toner particles are resonated by the ac electric field. Application of a very weak dc electric field under this condition causes the aggregates of toner particles to move toward the cylindrical electrode 11a. As a result of the above construction, small foreign matter such as an aggregate of toner particles whose size is about 100 .mu.m or a carrier adhering to the surface of the photosensitive body, or foreign matter contained in a developer on the developer carrying body can be removed surely without disturbing normal toner particles.

REFERENCES:
patent: 4588285 (1986-05-01), Tagoku
patent: 4918488 (1990-04-01), Creveling et al.

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