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