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