| 摘要 |
A color electrophotographic image forming apparatus includes a rotary to support and move developing devices to a development position without an independent driving motor for rotating the rotary. A number V of developing devices supported by the rotary are sequentially moved to and stopped at the development position in which the developing device faces a photosensitive drum. A drive transmission mechanism is provided in which each time one of a number M of claw portions of a trigger cam is disengaged from and engaged with a solenoid, the trigger cam makes a 1/M revolution, and once every 1/M revolution of the trigger cam, a driving force is transmitted to a rotary gear from a rotary drive gear which is rotated integrally with the trigger cam so that the rotary is stopped after being rotated by an angle W which is an aliquot part of (360°/N).
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