| 摘要 |
TWO PAIRS OF, I.E., FOUR, CENTERING SHAFTS (21,22,31,32) ARE PROVIDED SO AS TO MOVE IN SYNCHRONISM WITH EACH OTHER IN OPPOSITE DIRECTIONS THAT ARE PERPENDICULAR TO THE PULL-IN DIRECTION OF A DISC (100) AND PARALLEL WITH THE RECORDING SURFACE OF THE DISC (100). THE CENTERING SHAFTS (21,22,31,32)BUTT THE OUTER PERIPHERY OF THE DISC (100) AND THEREBY CENTER IT. THE MOST ILLUSTRATIVE DRAWING IS (FIGURE NO. 6).
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