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