Open-cell foam developing roller

Details Open-cell foam developing roller Open-cell foam developing roller

1990-05-02

1991-11-05

Pendegrass, Joan H.

Coating apparatus

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

With electromagnetic and/or electrostatic removal of...

355259, G03G 1508

Patent

active

050623850

ABSTRACT:
A developing device using a one-component developer is composed of colored fine synthetic resin toner particles. The device includes a vessel for holding the developer, and a developing roller rotatably provided within the vessel in such a manner that a portion of the roller is exposed therefrom and resiliently pressed against a surface of an electrostatic latent image formation drum. The roller is formed of a conductive open-cell foam rubber material, and a surface thereof is thermally or chemically treated to prevent a penetration of the toner particles to an open-cell foam structure of the developing roller, whereby a softness of the developing roller can be maintained over a long period. The developing device further includes a blade or roller member provided within the vessel and resiliently engaged with the developing roller, for regulating a thickness of the developer layer formed around the developing roller.

REFERENCES:
patent: 4827868 (1989-05-01), Tarami et al.
patent: 4967231 (1990-10-01), Hosoya et al.

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