| 摘要 |
PURPOSE:To make posiible determination of the position of the center hole for record of arbitrary diameters and detection of record diameters by providing the specified protrusion to the mounting and dismounting mechanism of records. CONSTITUTION:A stationary stopper for 30-cm records and a protrusion which normally protrudes so as to perform detention to a 17-cm record and is freely movable in and out according to the outputs from a record diameter detector is provided to the mounting and dismounting mechanism 11 of a record 9. Oscillating arms are provided to the left and right of a record insertin port 10 and the oscillating angles thereof are detected, by which the protrusion is moved in and out to determine the position of the center hole of the record. |
