stitch is carried out when the deep stitching show stitch is completed the cylinder 15 begins to act while the cylinder 8 continues to act on shaft 10 as limited by stopper 12 namely the rod 15a of the cylinder 15 is extended from the position shown in fig1 to a position fig1 which has been preset for changing the position of the cloth holder 2 to one at which the shallow stitching is to be carried out at this time the rod 15a contacts a forward end of the show stitch releasing adjust screw 16 and presses the screw 16 whereupon the position of the cloth holder 2 fixed to the bracket 13 which is fixed to the shaft 10 is changed from the one at which the deep stitching is carried out to the one at which the shallow stitching is to be carried out thus the cloth held by cloth holder 2 may be easily placed in respective positions to be subjected to both deep stitching and shallow stitching reference numeral 20 designates a stopper which is fitted to the button holder arm 7 an end of the stopper 20 is in contact with a projection of the arm 19 by.