Electrophotographic copiers

Details Electrophotographic copiers Electrophotographic copiers

1987-05-07

1989-04-11

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14D, 355 14R, G03G 1500

Patent

active

048210714

ABSTRACT:
An improved electrophotographic copier is proposed which includes a first static charger; an image exposure unit; a second charger provided with a grid; and a developer having a developing electrode, all being arranged around a photosensitive rotatable drum.
The second charger is impressed selectively with an a.c. voltage or a d.c. voltage which has an opposite polarity to that applied to the first charger. The voltage impressed to the grid has same polarity with that which is applied to the first charger. The developing agent contained in the developer includes such statically charged toner as having an opposite polarity to that of static latent images formed on the drum surface. The copier operates selectively in standard copy mode or in marginal image outline formation mode. The developing service is nevertheless carried out in the normal manner, thus employing no reverse development mode.

REFERENCES:
patent: 3967891 (1976-07-01), Rippstein
patent: 4222660 (1980-09-01), Furuichi et al.
patent: 4466732 (1984-08-01), Folkins
patent: 4630918 (1986-12-01), Yui et al.
patent: 4634259 (1987-01-01), Oishi et al.

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