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