Image Forming Apparatus and Developing Cartridge

摘要

A developing cartridge includes a case having a first sidewall and a second sidewall opposite to the first sidewall, and a developing roller disposed between the first sidewall and second sidewall. The developing roller can include a developing roller shaft and a developing roller member configured to carry a developing agent thereon, the developing roller member disposed around the developing roller shaft. Also, the developing cartridge can include an electrode disposed on the first sidewall adjacent to the developing roller shaft, the electrode electrically connected to the developing roller member, and a driven coupling disposed on the second sidewall. The electrode can include, an extending portion extending in a direction away from the first sidewall. An outermost periphery of the driven coupling defines a projection plane projecting in a direction towards the electrode, wherein at least a part of the extending portion is disposed within the projection plane.

主权项

1. A developing cartridge comprising:
a case including a first sidewall and a second sidewall opposite to the first sidewall; a developing roller disposed between the first sidewall and the second sidewall, the developing roller being configured to rotate about a first axis line; an electrode for applying developing bias to the developing roller, the electrode being positioned at the first sidewall, the electrode including a contact point; and a driven coupling positioned at the second sidewall, the driven coupling being configured to rotate about a second axis line, the driven coupling including:
a first cylindrical portion substantially hollowed and provided with an inner peripheral surface, the first cylindrical portion including a driven part which extends radially inward from the inner peripheral surface, anda second cylindrical portion concentrically disposed with the first cylindrical portion, the second cylindrical portion including a gear, wherein the contact point of the electrode is disposed within a plane of projection when the driven coupling is projected in a direction parallel to the second axis line towards the electrode, the plane of projection being defined by projecting the first cylindrical portion of the driven coupling in the direction parallel to the second axis line towards the electrode.