Patent ID: 8494403

Claim:
A developing device of an image forming apparatus, comprising: a developing member rotatably disposed and spaced apart from an image carrier to supply a developing agent to the image carrier; a developing agent containing part to contain the developing agent; at least one developing agent feeding member rotatably disposed in the developing agent containing part to feed the developing agent to the developing member; a rotary member to generate air flow to collect a portion of the developing agent scattered in a developing region between the image carrier and the developing member into the developing agent containing part; a developing member gear provided at one side of the developing member to be rotated by external drive force; a rotary member gear provided at one side of the rotary member; a feeding member gear disposed at one side of the developing agent feeding member to be rotated together with the developing agent feeding member; at least one idle gear arranged between the feeding member gear and the rotary member gear to transmit rotation force from the developing agent feeding member to the rotary member; a feeding member drive gear disposed at the other side of the developing agent feeding member; and at least one gear arranged between the developing member gear and the feeding member drive gear to transmit rotation force from the developing member gear to the feeding member drive gear.