means for issuing an alarm if {TAIL ~ a preset terminal position} of the forward motion of the ejector pins is remoter from {HEAD ~ the retracted position} than the criterial position of the ejector pins 
means for issuing an alarm if { TAIL ~ a preset terminal position } of the forward motion of the ejector pins is remoter from { HEAD ~ the retracted position } than the criterial position of the ejector pins
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH