| 摘要 |
When a disk (1) is placed at a playback position, a clamp arm (15) clamps the disk (1). The clamp arm (15) has an engagement hook (16) for engaging with an engagement groove (12) of a fixed base (11) when the clamp arm (15) pivots on a slide base (13) so as to return to a standby position for waiting for a pivot while the slide base (13) slides.
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