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