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 the edge portions of fabric pieces to which {HEAD ~ the core material} is already sewn for {TAIL ~ 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 the edge portions of fabric pieces to which { HEAD ~ the core material } is already sewn for { TAIL ~ engagement } thereof by simultaneously revolving with the edge portions clamped therebetween
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