In this case, the sewing machine is preferred further to comprise a pulling device which is positioned behind the sewing device and is provided with a pair of horizontal rollers designed to pull {HEAD ~ the edge portions} of {TAIL ~ fabric pieces} to which the core material is already sewn for engagement thereof by simultaneously revolving with the edge portions clamped therebetween 
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In this case , the sewing machine is preferred further to comprise a pulling device which is positioned behind the sewing device and is provided with a pair of horizontal rollers designed to pull { HEAD ~ the edge portions } of { TAIL ~ fabric pieces } to which the core material is already sewn for engagement thereof by simultaneously revolving with the edge portions clamped therebetween
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