| 摘要 |
The present invention provides a magnetic brush developing apparatus for developing latent electrostatic images with a particulate magnetic developer which comprises: (a) a rotatable non-magnetic developing sleeve, (b) first drive means connected to said sleeve for rotating said developing sleeve in a specified direction, (c) a magnetic roller rotatably disposed within the developing sleeve, (d) second drive means connected to said magnetic roller for rotating the magnetic roller in the same direction as the developing sleeve to transport said magnetic developer along the peripheral surface of the developing sleeve in a direction opposite to the direction of rotation of the developing sleeve, (e) a brush bristle height adjusting plate member having one end in pressing contact with the peripheral surface of said sleeve and a developer guide surface at an acute angle with respect to a tangent to said sleeve, said tangent extending in the direction of rotation of said sleeve, for scraping developer particles moving in the direction of rotation of said sleeve, from said sleeve and (f) a developer supplying means for supplying developer particles, through said developer guide surface of said brush bristle height adjusting plate member, to the peripheral surface of said sleeve to form bristle thereon; and whereby the length of the magnetic brush bristles formed by application of the developer particles to said sleeve can be controlled by adjusting the relative rate of rotation of said magnetic roller with respect to said sleeve.
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