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