elastic force detecting means for detecting {TAIL ~ an elastic force} of the springs during {HEAD ~ a forward motion} of the ejector pins from a retracted position 
elastic force detecting means for detecting { TAIL ~ an elastic force } of the springs during { HEAD ~ a forward motion } of the ejector pins from a retracted position
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH