| 摘要 |
A developing unit for an electrophotographic image forming apparatus is provided. The developing unit is rotatably installed in a photosensitive unit on which a photosensitive drum is mounted, centering on a hinge, and comprises a developing roller. The developing roller faces the photosensitive drum, is rotated, and develops an electrostatic latent image formed on the photosensitive drum. A center of a first idle gear to which a driving force is primarily transferred from a photosensitive drum gear formed as a single body in the photosensitive drum, is placed in the center of the hinge between the photosensitive drum gear and a developing roller gear formed as a single body in the developing roller.
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