Entwicklungsvorrichtung.

摘要

A developing device using a one-component developer composed of coloured fine synthetic resin toner particles, which device comprises 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 exposed therefrom is resiliently pressed against a surface of an electrostatic latent image formation drum. The roller is formed of a conductive porous rubber material so that pore openings appear over a surface of the roller, whereby during rotation of the roller, the toner particles are captured and held by the pore openings of the roller to form a developer layer therearound and are carried to the surface of the drum. The developing device further comprises a blade or roller member provided within the vessel and which is resiliently engaged with the developing roller, the regulating thickness of the developing layer formed around the developing roller.