in the rotary looptaker 83 is a bobbin case 87 in which a bobbin 88 with a thread supply 89 is received fig4 the bobbin case 87 is shaped with a radially extending nose 90 entering a stop notch 91 formed in a bridging bar 92 which is fastened by screws 93 to the flange 71 fig7 in order to prevent the bobbin case 87 from rotation for the purpose of positioning the tiltably arranged saddle 69 is installed with a shifting mechanism 94 fig4 and 6 on the cylindrical stud 70 there is clamped a lever 95 the free end of which is linked to an intermediate lever 96 by a bolt 97 the other end of the intermediate lever 96 is hingedly connected to one arm 98 of an angle lever 99 by a bolt 100 the angle lever 99 is pivoted on a bolt 101 fastened by a set screw 102 to the bracket 74 the free arm 103 of the angle lever 99 is provided with a handle 104 and a pin 105 on which a tension spring 106 acts the free end of the tension spring 106 is connected to a pin 107 arranged in the bed 62 fig7 for limiting the movement of the angle lever 99 the bracket 74 is provided with a pin 108 furthermore the saddle 69 is equipped with an electrical switch 109 which is fastened by means of screws 110 and a bracket 111 the electrical switch 109 has an actuating lever 112 which cooperates with a threaded stud 113 secured to the bed 62 by a lock nut 114 fig4 and 5 referring to fig8 in a modified shifting.