Electrostatic development apparatus.

摘要

Apparatus for developing electrostatic latent images, particularly in electrostatographic systems, permitting the continuous development of high quality images with effective and efficient coverage of solid areas. The apparatus comprises a development zone located between an imaging member (25) and a member (22) for transporting the developer into the development zone. The member (22) has a stationary shell containing rotatable magnets (20) preferably arranged with attenuating pole orientation, A metering blade (24) ensures that the thickness of the developer is such that in the development zone it is immediately adjacent the imaging member. The spacing between imaging member (25) and the stationary drum is preferably from 0.1 to 1.5 mm. A synthetic developer composition (23) is used comprising toner particles and carrier particles. The carrier particles, whose size is preferably from 50-250 mu m, includes resin particles and magnetite. In use the magnets are rotated in the shell magnetically inducing agitation of the developer particles. The imaging member is moved in the opposite sense to the rotation of the magnets.