Patent ID: 6785498
Filing Date: 2004-08-31
Classification: G03G

Abstract:
A development system for developing an image on an image bearing member with developer material, comprising:a housing containing the developer material; a magnetic developer roll for transporting a layer of the developer material from the housing to the image, the magnetic developer roll including a magnetic assembly including a magnetic core and a first stationary magnetic shunt, the magnetic core including a magnetic composite material containing a neodymium-boron-iron alloy, and a sleeve enclosing the magnetic assembly, wherein at least one of the sleeve and magnetic core being rotatable for providing relative rotation and for attracting the layer of the developer material onto the sleeve at a loading zone, for transporting the developer material layer on the magnetic developer roll to a development zone where at least a portion of the developer material layer is advantageously subject to agitation induced by field gradients in a magnetic field provided by the magnetic core, and for transporting the developer material layer further to a drop-off zone where the magnetic field is sufficiently blocked to discontinue the attraction of the developer material to the sleeve.