Lens edging system with programmable feed and speed control

B - Operations – Transporting – 24 – B

Patent

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51/22, 341/65

B24B 9/14 (2006.01) B24B 49/02 (2006.01) B24B 49/10 (2006.01) B24B 51/00 (2006.01) G05B 19/18 (2006.01)

Patent

CA 2037106

A computer numerical control machine system for edging lenses controls the rotation and displacement of a lens workpiece with respect to a edging tool in accordance with a lens shape stored in memory. The system continuously translates the lens workpiece axially across the surface of the wheel to uniformly distribute wear across the wheel surface, reducing the need to dress the edging tool. The system compares the lens size with predetermined dimensions and compensates for any difference by automatically adjusting the lens trajectory during the edging of subsequent lens workpieces, permitting the edging tool to wear down without appreciable errors in lens size. The system controls the edging tool speed, the lens rotation rate, the lens axial feed velocity and the grinding force between the lens workpiece and the wheel at each discrete point during the entire lens edging operation to optimize production while preventing overheating of the lens workpiece. The optimum values for these parameters are empirically determined in a preparatory programmed trial and error learning process of the invention.

Cette invention concerne un système de commande numérique informatisé de machines à meuler les bords de lentilles optiques, qui règle la rotation et la translation d'une lentille par rapport à la meule en fonction d'une forme conservée en mémoire. Le système déplace de façon continu la lentille en travers de la face travaillante de la meule pour répartir uniformément l'usure de cette dernière et réduire les besoins de dressage de l'outil. Il compare la taille de la lentille à des cotes prédéterminées et compense tout écart en modifiant automatiquement la trajectoire des lentilles à meuler de façon à induire une usure de la meule sans conséquence manifeste sur les cotes dimensionnelles des lentilles. Il règle la vitesse de la meule, le régime de rotation et la vitesse d'avance axiale de la lentille, et la force de meulage à chaque instant de l'opération pour optimiser la production sans surchauffe des lentilles. Les valeurs optimales de ces paramètres sont déterminées de façon empirique de meulage à une étape préparatoire programmée de définition par tâtonnement.

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