Patent ID: 9442424
Filing Date: 2016-09-13
CPC Classification: G03G

Claim Text:
1. A developing cartridge for a laser printer, comprising a stirring wheel that is configured to receive a torque and transfer the same to a stirring rack and that is enclosed on an outer wall of a tank of the developing cartridge by an end cover, the developing cartridge being characterized by further comprising: an activation mechanism comprising a diameter-changing wheel, a return spring and a sliding block, wherein the diameter-changing wheel is parallel with an axial direction of the stirring wheel and includes two sections of arcs of different diameters and these two arcs are connected with each other in an end-to-end manner, the larger diameter arc of the two sections of arcs is meshed with the stirring wheel at one end along the circumferential direction thereof, a protruding block is provided to axially face the end cover along the diameter-changing wheel at a non-circle center position facing a lateral end wall of the end cover at an axial side of the diameter-changing wheel, a part of the end cover corresponding to the diameter-changing wheel is provided as a planar inclined wall in an inclined and intersecting relation with an axial direction of the diameter-changing wheel, the inclined wall is provided with a sliding groove having the same inclination as that of the inclined wall relative to the axial direction of the diameter-changing wheel, the sliding block is slidably mounted in the sliding groove, the return spring presses the sliding block in the sliding groove at one end close to the diameter-changing wheel, an end of the sliding block opposing the diameter-changing wheel is in a free hanging state, and the end of the sliding block close to the diameter-changing wheel is located in front of the protruding block which moves circularly following the diameter-changing wheel, and extends to a base portion where the protruding block is adjacent to the diameter-changing wheel in the axial direction of the diameter-changing wheel.