Patent ID: 6229978
Filing Date: 2001-05-08
Classification: G03G

Abstract:
A developing apparatus for applying developer, which includes toner powder and magnetic powder, over an image carrier so as to develop a latent image formed on said image carrier, comprising:(I) a developing roller including(I-i) a fixed magnet, and(I-ii) a rotary sleeve, rotatably mounted around a circumference of said fixed magnet, said developing roller being operable to apply the developer, which is attracted to and held on an outer periphery said rotary sleeve by said fixed magnet, to a developing region of said image carrier, to develop the latent image on said image carrier;(II) a developer control member for regulating the amount of the developer, which is held on the outer periphery of said rotary sleeve of said developing roller, in a manner such that the developer is uniformly held on the outer periphery of said rotary sleeve; and(III) an aggregated toner dispersion member, which is disposed upstream to of said developer control member, said toner dispersion member having a contact face, engageable with aggregated toner powder of the developer, which is held on the outer periphery of said rotary sleeve, for crushing the aggregated toner powder to attain dispersion;said aggregated toner dispersion member being spaced by a predetermined distance from the outer periphery of said rotary sleeve and assuming such a posture that said contact face has an optimum angle with respect to a tangent of the outer periphery of said rotary sleeve.