| 摘要 |
An annular plug portion ( 21 ) projects from a clamp pallet ( 2 ). An annular shuttle member ( 23 ) is supported by the plug portion ( 21 ) to be movable in the vertical direction. A work pallet ( 3 ) is provided with a tapered inner peripheral surface ( 12 ) which makes an engagement with a tapered outer peripheral surface ( 28 ) of the shuttle member ( 23 ). A transmission member ( 29 ) is inserted into an upper portion of a cylindrical hole ( 21 a) of the plug portion ( 21 ), while a rod ( 31 ) is inserted into a lower portion of the cylindrical hole ( 21 a). When the rod ( 31 ) is driven downward for clamping, an output portion ( 36 ) of the rod ( 31 ) moves the work pallet ( 3 ) downward through engaging balls ( 34 ) to form a transmission gap (G) between a pushing portion ( 31 a) of the upper end of the rod ( 31 ) and a pressure receiving portion ( 29 b) of the transmission member ( 29 ). When the rod ( 31 ) is driven upwards for unclamping, the pushing portion ( 31 a) pushes upwards the work pallet ( 3 ) through the transmission member ( 29 ).
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