| 摘要 |
PURPOSE:To ensure the clamping of a disk by forming a small diameter part at the center in the axial center direction of a loading roller and constructing a clamper in a large diameter so that the rotating zone of the clamper may be located at this small diameter part. CONSTITUTION:Each loading roller 1, 2 is a straight roller, but has small diameter parts 1A, 2A at the center and one part of the clamper 4 fitted freely rotatably to a clamp arm 3 is located in the zone of this small diameter part 1A, 2A. The clamper 4 can clamp a disk D together with the table 6 fitted to the spindle shaft 5A of a spindle motor 5 without being obstructed by loading rollers 1, 2. The diameter of the clamper 4 is made larger corresponding to this small diameter part 1A, 2A. A clamped disk can thus keep a stabilized state.
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