of the sewing machine a bracket 28 is secured to the arm 11 by means of bolts 29 and a first solenoid 30 is supported on a horizontal portion 28a of the bracket 28 by means of a nut 31 a plunger 30a of the first solenoid 30 is pivotally connected to the first lever 13 by means of a pin 32 the first solenoid 30 is electrically connected in the control circuit 50 of fig8 which includes a first selecting switch 53 upon closure of the switch 53 the solenoid 30 will be energized to move the plunger 30a in the downward direction to cause the lever 30 to move in the clockwise direction as viewed in fig2 the downward movement of the end portion 13b of the lever 13 causes the first needle bar 21 to move in the downward direction to bring the upper end portion 21c of the first needle bar 21 into alignment with the upper end portion 22c of the second needle bar 22 a second shaft 33 is moveably supported on a boss 34 integrally formed within the arm 11 one end portion 33a of the second shaft is coupled to a boss portion 23a on the block member 23 which is moveable across the feeding line of the work to be sewn between a pair of horizontally spaced stops 35 and 35 39 the other end portion 33b of the second shaft 33 is provided with an annular groove 36 between a pair of axially spaced rings or.