Image forming apparatus having distribution brush and image carr

Details Image forming apparatus having distribution brush and image carr Image forming apparatus having distribution brush and image carr

1990-10-22

1993-03-23

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355211, G03G 1300

Patent

active

051968916

ABSTRACT:
In an image forming apparatus has a photosensitive drum, the drum is charged by a main charger. A light beam bearing image information is applied to the drum by an exposure system to form a latent image on the surface of the drum. The latent image is developed by a developing unit, using a toner to form a toner image on the drum surface. The toner image is transfered to the surface of a paper sheet by a transfer charger. The developing unit serves to remove, simultaneously with the development of the latent image, the toner remaining on the drum surface after the transfer by the transfer charger. Before the removing of the remaining toner, the drum is in sliding contact with a brush member. The remaining toner is temporarily attracted to the brush member by the bias voltage applied to the brush member, with the result that the remaining toner becomes easy to separate from the drum. In the apparatus, the drum and at least the brush member are integrated as one process unit. The process unit is removably insertable into a predetermined operative position in the body of the apparatus. Accordingly, when the drum is removed from the operative position, the toner attracted to the brush member is prevented from scattering in the body by removing the brush member with the drum.

REFERENCES:
patent: 3617123 (1971-11-01), Emerson
patent: 4351603 (1982-09-01), Tagawa
patent: 4598993 (1986-07-01), Mizutani et al.
patent: 4664504 (1987-05-01), Oda et al.
patent: 4769676 (1988-09-01), Makai et al.

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