Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1980-08-06
1982-05-18
Moses, Richard L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
118657, G03G 1500
Patent
active
043301983
ABSTRACT:
A magnetic brush developing device for an electrostatic copying apparatus wherein a magnetic brush is formed on a surface of a developing roller includes a magnet roller rotating inside of a cylindrical sleeve which is located adjacent to the surface of an electrostatic latent image retaining member to which a developing material is circumferentially applied. The magnet roller stops at a rotary angle such that a bristle of the magnetic brush on the sleeve is spaced from the surface of the electrostatic latent image retaining member, whereby a bristle of the magnetic brush is prevented from remaining in contact with the electrostatic latent image retaining member. Thereby, the developing material is prevented from causing the surface of the electrostatic latent image retaining member to change chemically, the developing material is prevented from causing the electrical characteristics of the surface to fail, and the developing material is prevented from adhering to the surface.
REFERENCES:
patent: 3811766 (1974-05-01), Robinson
patent: 3906897 (1975-09-01), Davidson
patent: 3942474 (1976-03-01), Smith et al.
patent: 4077358 (1978-03-01), Kito
Research Disclosure, "Magnetic Brush Development Apparatus", No. 14362, Mar. 1976, pp. 40,41.
Hasegawa Yuji
Matsumoto Joji
Mita Industrial Company Limited
Moses Richard L.
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