As {HEAD ~ the fabric} lying between {TAIL ~ gripping lines} is tensioned by the component of lateral displacement motion of the gripping elements, the fabric is simultaneously gathered by the component of closing motion 
lying between
As { HEAD ~ the fabric } lying between { TAIL ~ gripping lines } is tensioned by the component of lateral displacement motion of the gripping elements , the fabric is simultaneously gathered by the component of closing motion
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH