Electrostatic copying machine

Details Electrostatic copying machine Electrostatic copying machine

1977-04-12

1978-04-18

Pellinen, A. D.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3DD, G03G 1522

Patent

active

040848990

ABSTRACT:
An electrostatic image is formed on a rotating photoconductive drum and developed a number of times to form toner images which are transferred to respective copy sheets. The drum is rotated at a first speed for exposure and development of the first toner image and thereafter at a second higher speed for development of the subsequent toner images. A magnetic brush applies the toner substance to the drum, and is rotated at a third speed when the drum is rotated at the first speed and at a fourth speed which is higher than the third speed when the drum is rotated at the second speed, thereby applying more toner substance to the drum at the higher speed and maintaining the copy density constant. Alternatively or in combination, a bias voltage applied to the magnetic brush may be reduced at the higher drum speed, also resulting in the application of more toner substance to the drum.

REFERENCES:
patent: 3733127 (1973-05-01), Perlis et al.

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