Device for straining a part made of non-magnetic sheet

B - Operations – Transporting – 23 – Q

Patent

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Details

B23Q 3/154 (2006.01)

Patent

CA 2275341

The invention concerns a device for straining a part made of non-magnetic sheet (21) on a table (20), comprising permanent magnets (1, 2, 3, 4) evenly arranged under the table (20), with their polar surfaces perpendicular to the table plane and a magnetic circuit for each of the magnets including a yoke (27) in ferromagnetic material and ferromagnetic elements (12, 13, 14, 15, 16) closing the magnetic circuit, the magnets (1 to 4) rotating between two positions about an axis parallel to the polar surfaces of the magnets, inside a body whereof the top surface (20), perpendicular to said axes of rotation, forms the straining table. The yoke (27) comprises fixed and evenly arranged permanent magnets (33, 34) with parallel polar surfaces perpendicular to the table plane, said magnets facing each other with surfaces of same polarity; in a first position, the polar surfaces of the table magnets are mutually parallel, the magnets facing each other with surfaces of same polarity but of opposite polarity to that of the yoke corresponding magnets while in a second position, the magnets are facing each other with surfaces of same polarity and having the same polarity as the yoke corresponding magnet surfaces.

Le dispositif de bridage d'une pièce en feuille amagnétique (21) sur une table (20), comporte un arrangement régulier d'aimants permanents (1, 2, 3, 4) situés sous la table (20), dont les faces polaires sont perpendiculaires au plan de la table et un circuit magnétique pour chacun des aimants comportant une culasse (27) en matériau ferromagnétique et des éléments ferromagnétiques (12, 13, 14, 15, 16) de fermeture du circuit magnétique, les aimants (1 à 4) étant tournants entre deux positions autour d'un axe parallèle aux faces polaires des aimants, à l'intérieur d'un corps dont la surface supérieure (20), perpendiculaire à ces axes de rotation, forme la table de bridage. La culasse (27) comporte un arrangement fixe et régulier d'aimants (33, 34) permanents à faces polaires parallèles et perpendiculaires au plan de la table, ces aimants étant en regard les uns des autres par des faces de même polarité; dans une première position, les faces polaires des aimants de la table sont parallèles entre elles, les aimants étant en regard les uns des autres par des faces de même polarité mais de polarité opposée à celle des faces des aimants correspondants de la culasse tandis que dans une seconde position, les aimants sont en regard l'un de l'autre par des faces de même polarité et de même polarité que les faces des aimants correspondants de la culasse.

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