| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problems: the tension of a belt for rotating a rotation brush tilts a shaft portion of the rotation brush relative to a shaft-receiving portion; and when the shaft portion is inserted into a shaft receiver, the shaft portion is damaged and the reliability of a bearing portion is reduced.SOLUTION: A rotation brush 200 has a shaft-receiving portion 270, and the shaft-receiving portion includes a bearing portion 273 for supporting a shaft portion 220 of a rotating cleaner 240, and a bearing holding portion 271 for covering the bearing portion. The bearing portion 273 is disposed at a rotationally driving portion 251 on which a belt 190 is wound, on the opposite side of the rotating cleaner 240, and along a direction in which the axis of the shaft portion 220 extends, in a manner that the bearing portion is not overlapped on the rotationally driving portion, and the bearing portion is formed with a shaft receiver holding portion 65b for holding the shaft-receiving portion 270. The bearing portion 271 is disposed at the shaft receiver holding portion 65b, along the extending axial direction of the shaft portion 220, in a manner that the bearing portion is at least partially overlapped on the shaft receiver holding portion. The bearing holding portion 271 has an engaging portion 272, formed to project to one side from the bearing portion 273 toward the shaft portion, for preventing the rotation brush 200 from coming off. |
