63 in the counter clockwise direction until the cam 71 approaches the protrusion 69 on the first toothed segment 67 from the other side cf fig3 a at the beginning of the threading process for the upper thread the thread brake 61 is in the resting position according to fig3 c in order to achieve an optimum deflection of the upper thread into the thread brake 61 and or to insert the thread into the thread regulator the upper thread 79 initially extending in a straight manner must be deflected towards the thread brake 61 this occurs via the thread deflection lever 73 with its actuator hook 77 grasping the upper thread and transferring it from the initial position x into the deflection position y in order to transfer the thread deflection lever 73 from position x into position y the rotational direction of the drive motor 59 is reversed so that the actuator disc 63 rotates in the clockwise direction here the cam 71 also rotates the first toothed segment 67 in the clockwise direction and thereby pivots the thread deflection lever 73 engaging the toothed segment 67 into the position y fig3 d as soon as the thread deflection lever 73 reaches position y the upper thread leaps over a deflection protrusion not shown and is guided there such that the thread deflection lever 73 is returned into the resting position by rotating the drive motor 59 in the opposite rotational direction and when the motor 59 continues to rotate in the same rotational direction the thread brake 61 according to fig3 b and or 3 a can be stressed the drive motor 59 of the thread brake 61 therefore performs two.