Image forming apparatus and process for forming an image for mag

Details Image forming apparatus and process for forming an image for mag Image forming apparatus and process for forming an image for mag

1991-10-29

1992-12-01

Moses, Richard L.

Photocopying

Contact printing

Light boxes

118658, G03G 1509

Patent

active

051683113

ABSTRACT:
An image forming apparatus for forming an image for magnetic ink character recognition includes an image bearing member, a latent image forming device for forming on the image bearing member an electrostatic latent image corresponding to an image for magnetic ink character recognition and a developing device for developing the electrostatic latent image. The developing means includes a non-magnetic developer carrying member for carrying a one component magnetic developer to a developing zone, and a magnet disposed in the non-magnetic developer carrying member, the magnet forming a magnetic field of 600-1000 Gausses in the developing zone, a container for containing a one component magnetic developer to be supplied to the non-magnetic developer carrying member, wherein the developer contains magnetic toner containing not more than 50% by weight of a magnetic material and has a coercive force of 145-200 Oersted and a residual magnetization of 3.0-5.5 emu/g. A regulating member is provided for regulating a thickness of a layer of the one component developer on the developer carrying member so as to be smaller than a minimum clearance between the image bearing member and the developer carrying member in the developing zone.

REFERENCES:
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patent: 4395476 (1983-07-01), Kanbe et al.
patent: 4458627 (1984-07-01), Hosono et al.
patent: 4563086 (1986-01-01), Knapp et al.
patent: 4859550 (1989-08-01), Gruber et al.
patent: 5034298 (1991-07-01), Berkes et al.
patent: 5084733 (1992-01-01), Katoh et al.

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