| 摘要 |
The image forming apparatus of the present invention has: an image carrier to retain electrostatic latent images on its surface; a developing unit holding plural developing devices that can be exchanged by a rotatable revolver and supported rotatably by the main body of the image forming apparatus; a stepping motor that rotates the developing unit and moves a desired developing device to a developing position opposing to the image carrier; a locking mechanism that is capable of moving the revolver to the free unlocking position and the locking position to engage with the revolver for stopping the developing devices at the positions to exchange them; and an backstop gear that is movable to a first free position from the revolver and to a second position to engage with the revolver for preventing the developing unit to move in the direction reverse to the rotating direction by the stepping motor; and a backstop gear that moves to the second position when the stepping motor is shut off.
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