| 摘要 |
The image forming unit 100 includes a photosensitive drum 11 , a rotary developing device 30 , and a rotation speed control device 70 . Electrostatic latent images are formed on the surface of the photosensitive drum 11 . The rotary developing device 30 includes a plurality of developing apparatuses 13 having a developing roller 14 disposed in opposition to the photosensitive drum 11 , and a distance regulating collar 73 that regulates the distance between the photosensitive drum 11 and the developing roller 14 . The rotation speed control device 70 includes a rotation speed control device 71 that controls the rotation speed of the rotary developing device 30 so that for a predetermined period of time until the developing apparatus 13 reaches the developing position the rotation speed of the photosensitive drum 11 and the movement speed in the circumferential direction of the distance regulating collar 73 are equal.
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