an electric circuit for controlling the operation of the stopping device so as to enable the sewing machine to produce desired intermittent stitches basting appropriately in addition to the making of ordinary continuous stitches application_number US 78144477 A description referring to fig1 to 4 illustrating a first embodiment of the invention reference numeral 1 denotes an upper drive shaft of the sewing machine numeral 2 denotes an engaging member numeral 3 denotes a swingable lever herein referred to as arresting means numeral 4 denotes a pawl which cooperates with the engaging member 2 numeral 5 denotes solenoid and numeral 8 an electric switch for stopping the upper drive shaft 1 the upper drive shaft 1 is rotatably journalled in the machine head housing to drive the needle bar the feed dog and other parts of the sewing machine the engaging member 2 one embodiment of engaging means is composed of a bushing 22 fixed to the upper drive shaft 1 and having a diametrically enlarged flange at the inner end thereof and a pin 20 fixedly attached to the adjacent and face of the flange and parallel to the upper drive shaft pin 20 is a preferred embodiment of blocking means a.