Method for continuously checking the production of security...

B - Operations – Transporting – 41 – F

Patent

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Details

B41F 33/02 (2006.01) B41F 31/00 (2006.01) B41F 33/14 (2006.01) B41M 3/14 (2006.01) B42D 15/10 (2006.01)

Patent

CA 2406163

The ink-agitator (1) is supported and guided by fixed means between pedestals (2) and (3) above an ink fountain containing security ink. It is driven in alternate movement on its guiding means and its tip is dipping into the ink. Bore (11) receives a detector head in the form of a transformer with primary winding arranged for normally producing a "zero" magnetic field, adjustable ferrite core place in such a manner that the "zero" magnetic field is obtained for a standard magnetic property of the security ink, and secondary winding going out of balance and issuing a signal if the magnetic property of the ink into which the tip of the ink-agitator is displaced undergoes modifications. The output signal is transmitted to feed line (4) with slide contact (6) whereas the ground pole is connected through wire (5) and sliding contact (7).

L'agitateur (1) est supporté et guidé par des organes fixes entre des supports (2) et (3), au-dessus d'un bac à encre contenant de l'encre de sécurité. Cet agitateur est animé d'un mouvement de va-et-vient sur ces organes de guidage, sa pointe trempant dans l'encre. L'alésage (11) reçoit la tête d'un détecteur constitué d'un transformateur dont l'enroulement primaire est agencé de façon à produire normalement un champ magnétique "zéro". Un noyau de ferrite réglable est agencé de façon que le champ magnétique "zéro" soit obtenu pour une propriété magnétique normale de l'encre de sécurité. L'enroulement secondaire entre en déséquilibre et émet un signal si la propriété magnétique de l'encre dans laquelle est placée la pointe de l'agitateur subit des modifications. Le signal de sortie est transmis au câble d'alimentation (4) au moyen d'un contact à glissement (6), la masse de terre étant connectée via un câble (5) et un contact à glissement (7).

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