| 摘要 |
An image forming apparatus includes: a main assembly; a rotatable unit; a first gear, provided in one of the rotatable unit and the main assembly, including a gear portion at an arcuate portion having a center substantially aligned with a rotation center of the rotatable unit; a second gear, provided rotatably in another one of the rotatable unit and the main assembly, engageable with the first gear in a first rotation region of the rotatable unit; a third gear provided at a position different from a position of the second gear with respect to a circumferential direction of the arcuate portion, wherein the third gear is engageable with the first gear when the rotatable unit is rotated in a second rotation region thereof; and a damper mechanism for imparting rotational resistance to the second and third gears when each of the second and third gears is rotated.
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