Discriminator for bimetallic coins

G - Physics – 07 – D

Patent

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Details

G07D 5/08 (2006.01)

Patent

CA 2318419

A coin discriminator has a coin path (3) along which a coin (5) containing a first and a second portion (13a, 13b) made of different metals and/or metal alloys is arranged to pass; coil means (1a, 1b) positioned adjacent to the coin path; electrical means (7) for supplying time varying drive signals to the coil means; and detection means (9) for detecting eddy currents induced in the coin by the coil means. The coil means (1a, 1b) is arranged to induce in the coin (5) an eddy current loop (27), which in a predetermined region (25) of the coin crosses a bond (11) between the first and second portions (13a, 13b) of the coin.

Un discriminateur de pièces comporte un chemin pour pièces (3), le long duquel une pièce (5) constituée d'une première et d'une deuxième partie (13a, 13b) en métaux ou alliages métalliques différents; des moyens bobines (1a, 1b) positionnés à proximité du chemin pour pièces; un moyen électrique (7) pour envoyer des signaux de commande variant dans le temps aux moyens bobines; et un moyen de détection (9) pour détecter les courants tourbillonnaires induits dans la pièces par les moyens bobines. Les moyens bobines (1a, 1b) sont conçus de sorte qu'ils induisent dans la pièce (5) un courant tourbillonnaire (27) qui, dans une région prédéterminée (25) de la pièce, traverse une liaison (11) entre la première et la deuxième partie (13a, 13b) de la pièce.

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