Developer which discharges used carrier particles using a magnet

Details Developer which discharges used carrier particles using a magnet Developer which discharges used carrier particles using a magnet

1991-02-21

1992-03-10

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118657, 355251, G03G 2100

Patent

active

050953389

ABSTRACT:
A developer unit which develops an electrostatic latent image recorded on a photoconductive member used in an electrophotographic printing machine. The developer unit uses a developer material which ages during the life of the electrophotographic printing machine. Additional developer material having at least carrier granules and toner particles, is supplied to the developer material in the developer unit to extend the life of the developer material. Discharge of developer material from the developer unit is controlled by a permanent magnet and an electromagnet positioned adjacent an exit port in the developer unit. The permanent magnet generates a magnetic flux field in the region of the exit port to form a developer material curtain which prevents the passage of developer material from the exit port. When the electromagnet is energized, it generates a magnetic flux field which attracts developer material from the developer material curtain. Upon de-energization of the electromagnet, the developer material attracted thereto is discharged therefrom.

REFERENCES:
patent: 4614165 (1986-09-01), Folkins et al.
patent: 4891671 (1990-01-01), Iwamasa
patent: 4891673 (1990-01-01), Buell
patent: 4932355 (1990-06-01), Neufeld

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