Developing apparatus in a magnification-variable copier

Details Developing apparatus in a magnification-variable copier Developing apparatus in a magnification-variable copier

1978-12-19

1981-09-29

Lawrence, Evan K.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to attribute, absence or presence of work

118647, 118672, 355 10, B05C 1100, G03G 1510

Patent

active

042916437

ABSTRACT:
An apparatus for the development of an electrostatic latent image in a magnification-variable copier which is capable of preventing the development of black frames on the outer circumference of copying portion when the reproduction is to be performed on a reduced scale. For this purpose, the apparatus includes a developing electrode which is divided into a plurality of units, such that a proper biasing potential is applied to the copying portion, and a high biasing potential is applied to other portions, whereby the developing is not effected for the unnecessary portions.

REFERENCES:
patent: 3638610 (1972-02-01), Lyles et al.
patent: 3708161 (1973-01-01), Lux et al.
patent: 3784301 (1974-01-01), Sato
patent: 3822670 (1974-07-01), Sato et al.
patent: 4006709 (1977-02-01), Miyakawa et al.

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