Device for keeping an inaccessible element to be stabilised stationary in a required angular position and use of the device in a machine for processing textile threads

A device to maintain stationary, in a required angular position, an item to be stabilized, arranged on a device rotating through a bearing, using the attraction force of a multitude of pairs of magnets placed to face each other, with each pair comprising a magnet integral with the item to be stabilized and a magnet integral with a fixed part, comprising:

• at least two pairs of magnets arranged near one another on supports of materials having low reluctance,
• wherein the device ensures that the item to be stabilized is not put into rotation until the item to be stabilized is in the required angular position,
• the said pairs of magnets and the said supports forming a closed magnetic circuit except for an air gap, with magnets placed in such a direction that their north and south poles successively alternate with one another along said magnetic circuit,
• an item, sensitive to a magnetic field, is attached to the fixed part and placed inside the closed magnetic circuit formed when the item to be stabilized is in the required angular position, and in the axis or a radio plane of symmetry of the said circuit,
• said sensitive item supplies a logic output state corresponding to the “item to be stabilized in the required angular position” when the detected field is less than a predetermined maximum threshold, and a logic state corresponding to the “item to be stabilized being outside the required angular position”, when the detected field is greater than the minimum predetermined threshold.