| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a color electrophotographic image forming apparatus which surely moves and stops each developing device supported by a rotary support in a development position without arranging an independent driving motor for rotating the rotary support. <P>SOLUTION: By the rotation of the rotary 105, the V number (V is a natural number) of developing devices 18 supported by the rotary 105 are sequentially replaced and moved to the development position in which the developing device faces a photosensitive drum 2 in the image forming apparatus. The image forming apparatus is characterized in that a drive transmission mechanism is provided in which each time one of the M number claw portions 101a of a trigger cam 101 is disengaged from and engaged with a solenoid, the trigger cam 101 makes a 1/M revolution, and once every 1/M revolution of the trigger cam 101, a driving force is transmitted to a rotary gear 105a from a rotary drive gear 104 which is rotated integrally with the trigger cam 101, so that the rotary 105 is stopped after rotated by an angle W which is an aliquot part of (360/V). <P>COPYRIGHT: (C)2009,JPO&INPIT |
