Developing apparatus for image recorder

Details Developing apparatus for image recorder Developing apparatus for image recorder

1988-03-11

1989-07-25

Prescott, A. C.

Photocopying

Contact printing

Light boxes

355269, 355245, 118657, G03G 1508

Patent

active

048518743

ABSTRACT:
A developing apparatus for an electrophotographic copier or the like includes a cylindrical developing sleeve which is rotatable to transport one component magnetic toner to a predetermined developing region where a photoconductive element is positioned. A magnet layer magnetized to have N and S poles which alternate with each other at a predetermined small distance is provided in the vicinity of the surface of the developing sleeve so as to deposit the toner on the magnetic layer. A blade is pressed against the surface of the magnet layer for frictionally charging the toner which is deposited on the magnet layer. A clearance is defined between the surface of the magnet layer and the blade and sequentially reduced in a direction of rotation of the sleeve, whereby the toner is charged and, at the same time, regulated into an even thin layer.

REFERENCES:
patent: 4445771 (1984-05-01), Sakamoto et al.
patent: 4521098 (1985-06-01), Hosoya et al.
patent: 4528937 (1985-07-01), Kanno et al.
patent: 4575220 (1986-03-01), Sakamoto et al.
patent: 4632535 (1986-12-01), Nagata

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