Printing apparatus including apparatus and method for charging a

Details Printing apparatus including apparatus and method for charging a Printing apparatus including apparatus and method for charging a

1988-05-31

1989-10-24

Moses, R. L.

Photocopying

Contact printing

Light boxes

118653, G03G 1508

Patent

active

048765759

ABSTRACT:
The present invention relates to a development apparatus including structure for the dynamic toner metering and charging of nonmagnetic single component toner. To this end there is provided a flexible, rotating rod having an electrical bias applied thereto. The rod is captured or supported by a distributed bearing attached to a compliant blade. A toner cleaning blade held against the rod serves as a toner seal. The flexible rod is supported in a self-spaced relationship to a rigid donor roll which transports the charged toner to a development zone intermediate the donor roll and an imaging member. Self-spacing is provided by a layer of toner on the donor structure.
The donor roll and flexible rod form a toner metering and charging zone through which toner is moved to simultaneously charge and meter the toner particles. The roll and flexible rod are rotated in opposite directions for controlling the metering and charging of the toner in the nip.

REFERENCES:
patent: 2846333 (1958-08-01), Wilson
patent: 3143438 (1964-08-01), Campbell
patent: 3245377 (1966-04-01), Gettel
patent: 4382420 (1983-05-01), Ohnuma et al.
patent: 4406535 (1983-09-01), Sakamoto et al.
patent: 4406536 (1983-09-01), Suzuki et al.
patent: 4459009 (1984-07-01), Hays et al.
patent: 4464041 (1984-08-01), Haneda et al.
patent: 4505573 (1985-03-01), Brewington
patent: 4508052 (1985-04-01), Kohyama

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