| 摘要 |
A developing unit includes a photosensitive drum, a developing drum, and an agitator. When a charge of toner has dropped below a predetermined charging amount before a subsequent image foaming operation starts, a pre-driving operation is performed so that the developing drum and the agitator are rotated before a sheet feed operation stars. Therefore, sufficient charge can be applied to the toner before a developing operation starts, thereby providing a high-quality image. Also, because the photosensitive drum and the developing roller are separated from each other during the pre-driving operation, the photosensitive drum and the developing roller are prevented from being worn down.
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