Optical vend-sensing system for control of vending machine

G - Physics – 07 – F

Patent

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G07F 11/00 (2006.01) G07F 9/02 (2006.01) G07F 11/04 (2006.01)

Patent

CA 2329314

For ensuring that a vending machine motor will continue to operate until a product has descended through a vending space or an established time interval has elapsed, an optical beam is established across the vend space through which a product must drop. A change in beam intensity is detected. By preference infrared light is emitted at one focal point of an elliptical reflector, and detected at the other focal point. The light is emitted in pulses in the preferred embodiment, and the optical sensing system has automated calibration and error detecting functions.

Un faisceau optique traversant l'espace par lequel un produit distribué par un distributeur automatique doit tomber, permet d'assurer la continuation du fonctionnement du moteur du distributeur jusqu'à la descente du produit à travers cet espace de distribution ou la fin d'un intervalle temporel déterminé. Une modification de l'intensité du faisceau est détectée. De préférence, de la lumière infrarouge est émise au niveau d'un point focal d'un réflecteur elliptique et détectée au niveau de l'autre point focal. Dans le mode de réalisation préféré, la lumière est émise par impulsions et le système de détection optique possède des fonctions automatiques de calibrage et de détection d'erreurs.

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