electrically energized a driven sprocket 87 which in turn is linked through chain 88 to a drive sprocket 89 on a driven shaft 90 the driven shaft 90 is keyed to a gear 91 which meshes with a gear 92 fixed upon a reducer driven shaft 93 carrying a reducer mechanism 94 which in turn is coupled through the pulley and belt transmission 95 to the main drive shaft 18 the gears 91 and 92 are utilized to reverse the direction of the shaft 90 since the reduction gear 94 is a double reducer having a reverse direction from the reducer mechanism 81 so that the yarn feed drive shafts 68 71 are driven in the same direction from each end as illustrated in fig1 each of the low speed electromagnetic clutches 86 includes an electromagnetic coil 97 which is held in a stationary position such as by the support arms 98 fixed to the side walls of the clutch housing 42 keyed to the shaft 68 is a rotary clutch member 99 the sprocket 87 is fixed to an annular armature 100 and a rotary bearing or bushing 101 which is free to rotate about the shaft 68 however when the coil 97 is energized the clutch member 99 engages the armature 100 to cause the sprocket 87 to rotate with the shaft 68 all of the low speed electromagnetic clutches 86 and the high speed clutches 76 are preferably identical the electromagnetic coils 97 are connected through leads 102 to.