Patent ID: 7059556
Filing Date: 2006-06-13
Classification: D03D

Abstract:
1. Thread supplying device comprising a housing containing an electric motor with a motor stator secured against rotation in the housing and a motor rotor fixedly arranged on a rotatably supported motor shaft, a thread guiding element fixedly secured to the motor shaft for co-rotation about an axis of the motor shaft, and a threading means arranged in a fixed position in the housing, the thread guiding element being aligned with the threading means in one target rotational position of the motor shaft in relation to the housing when the motor has stopped, wherein the electric motor is a permanent magnet motor including coils carrying pole cores in the stator and permanent magnets in the rotor, the pole cores and the permanent magnets being arranged to co-act in current-free condition of the permanent magnetic motor such that the rotor is held against rotation by magnetic forces in one of several stable positions relative to the stator, wherein the stator, the rotor and the thread guiding element are arranged relative to the housing and to the axis such that in one of the stable relative rotational positions of the rotor the motor shaft is retained in the target rotational position, and wherein the rotational position of the stator in the housing and one of the stable positions are matched with the target rotational position by a rotation positioning device provided between the housing and the stator.