Magnetic brush type developing apparatus for development of elec

Details Magnetic brush type developing apparatus for development of elec Magnetic brush type developing apparatus for development of elec

1987-06-09

1988-06-21

Prescott, A. C.

Photocopying

Including fiber optics

355 14D, 118657, 430122, G03G 1508

Patent

active

047528028

ABSTRACT:
At least one developing unit of the magnetic brush type is disclosed opposite to an electrostatic latent image carrier, said developing unit having a developing sleeve in which is housed a magnetic roller having a weak-magnetic or non-magnetic portion. The developing unit also has drive means for rotating the magnetic roller and the developing sleeve a specified degree, whereby the magnetic roller is so rotated that its weak-magnetic or non-magnetic portion is allowed to pass a position opposite to a level regulating member, and whereby the developing sleeve is subsequently so rotated until its outer peripheral portion opposite to the weak-magnetic or non-magnetic portion reaches a position opposite to the electrostatic latent image carrier. Thus, a developing powder present on the outer periphery of the developing sleeve is shunted away from a developing zone on the outer periphery. Such shunting of the developing powder is carried out with any of the developing unit other than one selected for developing operation.

REFERENCES:
patent: 3572288 (1971-03-01), Turner
patent: 4492456 (1985-01-01), Haneda et al.
patent: 4585326 (1986-04-01), Okamoto et al.
patent: 4591261 (1986-05-01), Saruwatari et al.
patent: 4592653 (1986-06-01), Ikeda et al.

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