When the upper surface of {TAIL ~ the workpiece} is detected, a plate thickness calculation section calculates {HEAD ~ a plate thickness} of the workpiece based on an upper surface position of a die, that is known in advance and stored in a memory 
When the upper surface of { TAIL ~ the workpiece } is detected , a plate thickness calculation section calculates { HEAD ~ a plate thickness } of the workpiece based on an upper surface position of a die , that is known in advance and stored in a memory
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD 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 OTH OTH OTH