Apparatus for dispensing powder in an array

G - Physics – 01 – F

Patent

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Details

G01F 11/20 (2006.01) G01F 13/00 (2006.01) G01N 35/00 (2006.01)

Patent

CA 2474265

A bifurcated bracket (12) carries two powder dispensing assemblies (B). Each assembly includes a powder reservoir (20) and a rotatable screw (64) received within a compliant silicone sleeve (74). The outer diameter of the screw is slightly larger than the inner diameter of the sleeve such that the screw blade maintains direct contact with the sleeve wall as the screw is rotated. The bracket is sequentially moved to align each assembly with containers in two arrays. Each array of containers is situated in a tray. The trays are manually positioned on independent scales which generate signals that are a function of the sensed weight of each array. To fill each container, the screw in the aligned assembly is rotated at a high rate for an initial period and then at a slower rate. The scales are operational only during the slower rate period. Assembly movement and screw rotation are computer controlled.

Un support à deux branches porte deux ensembles distributeurs de poudre. Chaque ensemble comprend un réservoir de poudre et une vis rotative logée dans un manchon compliant en silicone. La vis a un diamètre externe légèrement supérieur au diamètre interne du manchon de telle façon que la pale de vis reste en contact direct avec la paroi de manchon lorsque l'on tourne la vis. Le support se déplace par intermittence pour aligner chaque ensemble distributeur aux conteneurs en formant ainsi deux systèmes. Chaque système de conteneur est placé sur un plateau. Les plateaux sont positionnés manuellement sur des plates-formes de graduation indépendantes qui génèrent des signaux en fonction du poids détecté de chaque système. Pour remplir chaque conteneur, la vis du système aligné tourne à une vitesse élevée pendant une période initiale puis à une vitesse basse. Les plates-formes de graduation sont opérationnelles uniquement pendant la période de vitesse basse. Le mouvement de l'ensemble et la rotation de la vis sont contrôlés par ordinateur.

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