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