Abrégé

According to the invention: at least two pairs of magnets (31.1, 31.2) are arranged adjacent to one another on mountings (32, 34); said pairs of magnets (31.1, 31.2) and said mountings (32, 34) form, when the element to be stabilised is in the required angular position, a closed magnetic circuit (with the exception of the air gap), the magnets (33, 34) being oriented such that the north and south poles thereof alternate along said magnetic circuit; an element (37), which is sensitive to the magnetic field, is attached to the stationary portion and arranged inside the closed magnetic circuit; said sensitive element (37) outputs an output logic state corresponding to the "element to be stabilised in the required angular position" when the detected field is lower than a predetermined maximum threshold, and a logic state corresponding to "element to be stabilised outside of the required angular position" when the detected field is higher than a predetermined minimum threshold.

Classes IPC  ?

• D01H 7/86 - Dispositifs à torsion multiple, p. ex. dispositifs de retordage double torsion deux-pour-un
• D01H 13/14 - Dispositifs avertisseurs ou de sécurité, p. ex. de détection automatique des défauts, mouvements d'arrêt

Abrégé

According to the invention, the device includes: a capstan (13) consisting of at least one motor-driven roll (15) having an evolutionary diameter over at least a portion of the length thereof, said portion comprising an intake area for the yarn (FT), the speed of rotation of said roll (15) being such that, at least at one point, the peripheral speed thereof is greater than the driving speed of the yarn (FT): - at least one yarn guide (17) positioned upstream from said roll (15), opposite the evolutionary diameter portion, said yarn guide (17) being movably mounted so as to move the intake point of the yarn; - a yarn accumulator system positioned downstream from the roll (15) and having arrangements (16) capable of absorbing a quantity of yarn; - connection means between the accumulator system and the yarn guide (17), which are shaped so as to move in one direction or another; said yarn guide moves relative to the evolutionary diameter portion of the roll on the basis of the increase or decrease in the quantity of yarn absorbed by the accumulator.

Classes IPC  ?

• B65H 51/12 - Rouleaux, poulies, cabestans ou éléments rotatifs à prise à engrenages disposés pour fonctionner en groupes ou en coopération avec d'autres éléments en conjonction espacée de manière à créer une série de surfaces indépendantes de défilement autour desquelles le matériau est passé ou enroulé
• B65H 57/28 - Guides alternatifs ou oscillants
• B65H 59/36 - Éléments flottants compensant les irrégularités dans l'alimentation ou la prise du matériau
• B65H 59/38 - Réglage ou commande de la tension du matériau filiforme, p. ex. pour empêcher les vrillesUtilisation d'indicateurs de tension par régulation de la vitesse du mécanisme d'entraînement des dispositifs de déroulage, de dévidage, d'avance, d'enroulement ou d'emmagasinage, p. ex. en réaction automatique aux variations de tension