Developing device of electrophotographic printer

Details Developing device of electrophotographic printer Developing device of electrophotographic printer

1991-04-17

1991-12-17

Grimley, A. T.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

118657, 355251, 355253, G03G 1509

Patent

active

050726900

ABSTRACT:
A developing device for use in an electrophotographic printer comprises a non-magnetic cylindrical developing sleeve for conveying magnetic toner on its surface in rotating condition, a toner supply unit for supplying the magnetic toner onto the developing sleeve, a fixed magnetic field generating member disposed inside the developing sleeve, and a doctor blade unit disposed in confronting relation to the surface of the developing sleeve for regulating the layer thickness of the magnetic toner. The doctor blade unit includes a pair of magnetic pole plates whose distal ends are spaced a given distance from each other and magnetized as to exhibit opposite magnetic polarities. The fixed magnetic field generating member has a notch formed in a section facing the magnetic pole plates such that its magnetic flux does not act virtually on the magnetic pole plates.

REFERENCES:
patent: 4213617 (1980-07-01), Salger
patent: 4233935 (1980-11-01), Uehara
patent: 4876574 (1989-10-01), Tajima et al.
IBM Technical Disclosure Bulletin, vol. 1, No. 3, p. 6, Oct. 1958, Schaffert, R. M., "Development of Electrostatic Images".

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