Abstract: At least two pairs of magnets are arranged near one another on supports, the pairs of magnets and the supports form, when an item to be stabilized is in a required angular position, a closed magnetic circuit (except for the air gap), with magnets placed in such a direction that their north and south poles successively alternate with one another along the magnetic circuit, an item, sensitive to the magnetic field, is attached to the fixed part and placed inside the closed magnetic circuit, the 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 not in the required angular position”, when the detected field is greater than a minimum predetermined threshold.

Abstract: According to the invention: at least two pairs of magnets (31.1, 31.2) are arranged near one another on supports (32, 34), the said pairs of magnets (31.1, 31.2) and the said supports (32, 34) form, when the item to be stabilized (30) is in the required angular position, a closed magnetic circuit (except for the air gap), with magnets (33, 34) placed in such a direction that their north and south poles successively alternate with one another along said magnetic circuit, an item (37), sensitive to the magnetic field, is attached to the fixed part and placed inside the closed magnetic circuit, said sensitive item (37) 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 not in the required angular position”, when the detected field is greater than a minimum predetermined threshold.

Abstract: This method is distinctive in that: the rotation speed (Vo) obtained with the reel empty is recorded beforehand; and after start-up, the rotation speed (Vd) of the reel that is being wound is measured. The latter speed corresponds to the maximum speed reached at the end of a start-up acceleration phase and at the start of a gradual slowdown phase after the winding phase and this speed is compared to that obtained when the reel was empty. If the rotation speed (Vd) measured after start-up is substantially equal to or greater than the rotation speed (Vo) obtained when the reel was empty, length metering is then reset. If the speed after start-up is substantially less than the rotation speed obtained with the reel empty, metering is resumed from a point where it stopped.