A determination section detects {TAIL ~ a position} at which {HEAD ~ a punch} attached to the ram contacts an upper surface of a workpiece, based upon a change in the detected pressure 
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A determination section detects { TAIL ~ a position } at which { HEAD ~ a punch } attached to the ram contacts an upper surface of a workpiece , based upon a change in the detected pressure
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH