| 摘要 |
Time Ti since an immediately preceding rotational reference position 16a1 is calculated by a timer in accordance with a detection signal at a rotational reference position 16a1, and then it is stored. When a black photosensitive drum 2K is stopped in a monochrome mode using the stored time Ti, the phase of the black photosensitive drum 2K is matched with the phases of the photosensitive drums 2Y, 2C, and 2M whose rotations are stopped in a color mode, thereby making it possible to prevent positional shifts between color toner images and a black toner image. |
