The advantages of the 221-76 become especially apparent when sewing topstitching seams in heavy large-area work-pieces. The long-arm construction allows easy handling of voluminous workpieces. Due to the especially large bobbin capacity less bobbin change is required. The robust machine provides exemplary features and an impeccable stitch pattern also when used for other sewing operations. Due to the large stroke of the sewing feet it is possible to process even thick materials with different thickness of material plies.