Abstract: An invisible stitch hemming device for sewing tubular workpieces having first and second vertical walls interconnected and angularly disposed one to the other. A feeler element disposed in close proximity with the walls detects areas of the workpiece having increased thickness and is operatively connected to an actuating means which is effective when such areas are detected in displacing the first wall to permit unrestricted advance of the workpiece and simultaneously the second wall moves to a position for maintaining the workpiece in alignment with the sewing axis.

Abstract: An auxiliary transport device for sewing machines utilized to attach bands to the edge of a workpiece having a pair of spaced roller members disposed in frictional engagement with a band attached to the workpiece and simultaneously rotated incrementally for advancing the workpiece away from the sewing zone. A compensating roller is mounted co-axial with one of the pair of spaced roller members and incrementally rotated therewith in a location to frictionally engage and advance that portion of the workpiece extending from the band. The compensating roller is capable of yielding in a vertical direction without effecting the position of the roller with which it is operatively associated and provides a means for effectively accommodating portions of the workpiece varying in thickness as a result of attachments such as loops, pockets and the like.