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