| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently assure both of a safety factor of a motor in clamp-releasing operation and a time margin for switching of the motor. SOLUTION: The disk unit has a clamping mechanism 6 equipped with a first attracting body 61 and second attracting body 65 which attract each other by magnetic force. The second attracting body 65 is pulled downward and is detached from the first attracting body 61 through the descending action of an elevating body 26 of a cam mechanism 2. An upper slope 22a and lower slope 22b of a cam groove 22 of a can body 21 have different gradients. A cam projection 27 of the elevating body 26 is disposed between the two slopes 22a and 22b. When the can projection 27 descends down to an intermediate position of the upper slope 22a, the second attracting body 65 descends to the position where the attraction forces between the first and second attracting bodies 61 and 62 disappear. COPYRIGHT: (C)2005,JPO&NCIPI
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