Patent ID: 7606517

Claim:
An image forming apparatus comprising: a first developing unit comprising a first fixed power transmission unit; a second developing unit comprising a second fixed power transmission unit; a first sliding power transmission unit comprising a first interconnection portion placed slidably along a first axis of the first fixed power transmission unit; a second sliding power transmission unit comprising a second interconnection portion placed slidably along a second axis of the second fixed power transmission unit; and a clutching unit comprising a rotating element having a pushing boss protruding towards at least one of the first and second sliding power transmission units, the pushing boss selectively contacting at least one of the first and second sliding power transmission units when the rotating element is rotated, so that at least one of the first and second sliding power transmission units is slid towards at least one of the first and second fixed power transmission units to couple with or separate from at least one of the first and second fixed power transmission units, respectively.