Electrophotographic developer with carrier overflow control

Details Electrophotographic developer with carrier overflow control Electrophotographic developer with carrier overflow control

1977-12-22

1979-07-24

Stein, Mervin

Coating apparatus

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

With electromagnetic and/or electrostatic removal of...

427 18, G03G 1309

Patent

active

041619234

ABSTRACT:
A magnetic-brush developer for use in an electrophotographic machine wherein the magnetic brush is used to transport toner-coated carrier particles to an elevated development zone from a pickup zone. A path for so moving the carrier is provided between the magnetic brush roll and an overflow plate, the lower end of which also serves as a doctoring blade. The carrier is moved to the top of the roll where a doctoring blade limits the amount of carrier entering the development zone. Excess carrier is accumulated in an expanded spatial area near the doctoring blade and returned to the vicinity of the pickup zone by falling back between the overflow plate and the housing. An area is provided near the doctoring blade at the top of the roll where no magnetic field is present. The overflow plate is made of non-magnetic material.

REFERENCES:
patent: 3572922 (1971-03-01), Olden
patent: 3608522 (1971-09-01), Davidson
patent: 3754526 (1973-08-01), Caudill
patent: 3828730 (1974-08-01), Yamashita et al.
patent: 3863603 (1975-02-01), Buckley et al.
patent: 3882821 (1975-05-01), Katayama et al.
patent: 3909864 (1975-10-01), Tanaka et al.
patent: 3999514 (1976-12-01), Abbott et al.
patent: 4007707 (1977-02-01), Buchan et al.
patent: 4026241 (1977-05-01), Takebe et al.
IBM Technical Disclosure Bulletin, vol. 17, No. 3, Aug. 1974, "Magnetic Conveyor Roll", pp. 675-676, R. A. Daniels et al.

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