| 摘要 |
A movement device where a clearance between a contact body and a support rail is automatically eliminated, so that the device has no play. This can be achieved without an increase in preload and even with wear on the contact body and the support rail. The preload device (8) has a rotation body (10), a first urging member (18), a base member (12), and a spherical member (20). The rotation body (10) is rotatably installed in the device, has the contact body (7) connected to the rotation body (10) and located at a position displaced from the axis (b) of rotation of the rotation body, and is placed so that the contact body (7) comes into contact with and separates from the support rail (2) when the rotation body (10) is rotated. The first urging member (18) urges the rotation body (10) in the direction in which the contact body (7) is in contact with the support rail (2). The base member (12) covers at least a portion of the outer peripheral surface or inner peripheral surface of the rotation body (10) and has a facing surface formed such that the distance between the facing surface and the rotation body (10) is gradually increased in the direction of rotation of the rotation body (10) by the urging force by the first urging member (18). The spherical member (20) is provided between the rotation body (10) and the facing surface of the base member (12) so as to be in contact with the facing surface and the rotation body (10). |
