Development system for developing an image on an image bearing member
AssigneeXerox Corporation
InventorEugene J. Manno
Life of this patent
Estimating the term…
Abstract
A development system optimized for efficient development of an electrostatic latent image on an imaging surface. The development system includes a development material sump, a magnetic developer roll including a rotatable sleeve having located therein a rotatable magnetic core, and a developer material delivery system for providing a metered supply of developer material to the rotatable sleeve. One or more stationary magnetic shunts are located with respect to the magnetic core, sleeve, and/or developer material delivery system so as to block the magnetic field effective for attracting developer material to the sleeve, thus allowing disengagement of the developer material therefrom at a drop-off zone.
Claims20
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.
A method for developing an image on an image bearing member with developer material, comprising:
- providing a supply of the developer material;
- transporting a layer of the developer material on a magnetic developer roll from the supply 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;
- wherein the magnetic developer material layer is transported on the 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 transported further to a drop-off zone where the magnetic field is sufficiently blocked to discontinue the attraction of the developer material to the sleeve.
Dependencies are inferred from the claim text.