| 摘要 |
Wear of a sliding member is prevented or controlled in a portion of the sliding member at a specific angular position (phase) about an axis. A fixing device includes a chuck-actuating claw which rotates with a main spindle, and is displaced to open and close a chuck section, a rubber ring which rotates with the main spindle, and a bobbin (sliding member) which is provided to be movable between a first position and a second position along an axis direction of the main spindle, rotates with the rubber ring in contact with the rubber ring in the first position, rotates with the chuck-actuating claw while displacing the chuck-actuating claw in contact with the chuck-actuating claw in the second position, and does not have contact with both of the rubber ring and the chuck-actuating claw in a partial range between the first position and the second position.
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