Patent ID: 6061541
Filing Date: 2000-05-09
Classification: G03G

Abstract:
An improved developer roll for a toner cartridge comprising:a developer roll sleeve rotatably mounted within a housing of the cartridge adjacent a toner tank and an image transfer drum;a substantially stationary developer roll magnet located within the developer roll sleeve, the magnet being substantially cylindrical and being substantially coaxial with the developer roll sleeve; anda strip of magnetic material extending axially along a surface of the magnet at a predetermined position about a circumference of the magnet, the strip defining an increased magnetic field at the predetermined position along the developer roll magnet surface, wherein the strip is mounted in a groove extending axially on the developer roll magnet surface with a base of the strip positioned adjacent to a base of the groove, the base of the groove having a depth in a radial direction that is variable with respect to the developer roll magnet surface taken along an axial direction so that a magnetic field generated by the strip is variable axially along the surface of the developer roll.