means for moving said carriage in {HEAD ~ the machine direction} in response to {TAIL ~ movement} of said strip, 
means for moving said carriage in { HEAD ~ the machine direction } in response to { TAIL ~ movement } of said strip ,
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH