EP0281480A1 - Ophthalmic glasses bevelling machines - Google Patents

Ophthalmic glasses bevelling machines Download PDF

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Publication number
EP0281480A1
EP0281480A1 EP88400493A EP88400493A EP0281480A1 EP 0281480 A1 EP0281480 A1 EP 0281480A1 EP 88400493 A EP88400493 A EP 88400493A EP 88400493 A EP88400493 A EP 88400493A EP 0281480 A1 EP0281480 A1 EP 0281480A1
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EP
European Patent Office
Prior art keywords
edge
probe
blank
machine according
glass
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88400493A
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German (de)
French (fr)
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EP0281480B1 (en
Inventor
Jean-Pierre Marie Fernand Langlois
Michel Jean Lecerf
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Briot International SA
Original Assignee
BRIOT INTERNATIONAL DITE Ste
Briot International SA
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Publication of EP0281480A1 publication Critical patent/EP0281480A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B24B47/225—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses

Definitions

  • the present invention relates to automatic machines for grinding and beveling spectacle lenses.
  • Conventional machines for grinding and beveling ophthalmic lenses include a U-shaped carriage slidingly mounted and oscillating on a fixed horizontal shaft, a second horizontal shaft mounted to rotate perpendicularly between the branches of the U-shaped carriage, formed of two parts between which is clamped the glass to be worked, and a third rotary horizontal shaft carrying the different grinding wheels, to overflow and bevel.
  • the edge of the lens has a cylindrical shape and a beveling operation must be carried out by guiding the lens to form a bevel of its edge.
  • V-shaped section located between the edges of its periphery, this bevel being intended to be housed in the groove of the bezel of the frame.
  • FR-A-2 456 304 describes a device for measuring the distance between a determined point of the desired contour of an ophthalmic lens and the plane tangent to the pole of the convex surface of this lens.
  • This device comprises an assembly with two feelers cooperating one with the glass and the other with the template, mounted on the carriage and movable parallel to the axis of the template and the glass, one of the feelers being in contact with the glass surface.
  • the probe in contact with its surface provides an indication of moving an index in front of a graduated index.
  • the object of the invention is therefore to provide an automatic machine for grinding and beveling ophthalmic lenses, of the type comprising a sensor and in which this correction calculation is unnecessary.
  • the invention also aims to provide a device for making a bevel guided on the edge of an ophthalmic lens, automatically and with great precision.
  • the probe has a surface whose curvature is identical to that of the grinding wheel.
  • the surface of the probe is formed by the adjacent edges of several mobile juxtaposed blades adapted to act on sensors sensitive to their movements.
  • said probe is placed next to the grinding wheel, the curvature of its surface being concentric with that of the grinding wheel.
  • the probe is mounted movable above the grinding wheel, so that it can move perpendicular to the shaft of the grinding wheel between a position high, away from the blank, and a low position in which it is resiliently biased in contact with the edge of the blank.
  • the feeler consists of three juxtaposed mobile elements.
  • a conventional grinding and beveling machine comprises a carriage 1 of U-shape mounted oscillating on a horizontal shaft (not shown) and between the branches of which is mounted a second horizontal shaft 2 in two parts between which is clamped a blank 3 of an ophthalmic lens which has been cut out on a grinding wheel 4 rotatably mounted on a third horizontal shaft 5.
  • the machine comprises a sensor 6 of the angular position of the blank 3 in rotation, and another sensor (not shown) of the position of the carriage 1 in translation parallel to the shaft 2.
  • the carriage 1 is lowered to bring the blank 3 into contact with the grinding wheel 4.
  • the machine comprises a feeler, designated as a whole by the reference 7 having a surface having a curvature identical and concentric to that of the grinding wheel 4, and mounted adjacent to this on a suitable support 8.
  • the probe 7 the internal arrangement of which is not part of the invention and which may be mechanical, pneumatic, magnetic, electronic or other, has a curved surface formed by the edges of several plates or thin adjacent parallel movable blades 9 mounted in the field, vertically, acting independently on a device 10 sensitive to a pressure exerted on them to provide an electrical signal representative of the number of blades on which this pressure is exerted.
  • the feeler 7 can therefore provide a measurement of the width of its surface on which the edge of a cut blank 3 brought into contact with it bears by means of a movement of the carriage 1.
  • FIGS. 3 and 4 show an embodiment of a feeler 17 comprising three blades 19 mounted to oscillate and acting on three sealed sensors 20.
  • the total width of the feeler corresponds to the maximum total thickness of an ophthalmic lens, ie 20 mm.
  • the probe is limited by lateral stops 21 to detect the front and rear faces of the blank.
  • part of the edge of the blank 3 is always in contact with the central blade 19.
  • a measurement will be taken on the probe of the front face of the blank for a complete revolution thereof. , then we will proceed in the same way for the rear face.
  • the measurements read on the probe will be memorized for each angle read by the angular position sensor 6 of the blank and then used by the microprocessor to control the movements of the carriage in translation for the execution of the bevel on the grinding wheel 11.
  • the probe 27 can be mounted on the carriage 1.
  • this variant requires an additional mechanism on the carriage to raise and lower the probe in contact with the blank , making this solution more expensive without providing any particular advantage.
  • the operating cycle of the machine has been indicated by arrows in FIG. 3, from the end of the trimming of the blank (position A), translation on the probe B, C, D, lifting E, translation on the bevel wheel F and bevel G.
  • the device since the radius of the probe is identical to that of the grinding wheel, the device takes account of the grinding point and makes it possible to read a theoretically unlimited quantity of measurements over the entire periphery of the glass, thus eliminating the correction calculation.
  • the invention makes it possible to suppress the production of a free bevel by passing directly from the trimming phase to that of the guided bevel while nevertheless leaving the possibility of producing a free bevel if desired.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

Cette machine, comprenant un chariot mobile en translation et en oscillation parallèlement et perpendiculairement par rapport à un arbre portant des meules à détourer et à biseauter, comprend un palpeur (7) adapté pour venir en contact avec la tranche d'une ébauche détourée (3), perpendiculairement à cette tranche, et adapté pour mesurer la distance L1 du bord de la face avant du verre (3) par rapport à celui d'un verre plan pour lequel L1 = 0, et la valeur de L2 qui correspond à l'épaisseur de la tranche du verre. Le palpeur (7) présente une courbure identique et concentrique à celle de la meule (4, 11) et formée par plusieurs éléments parallèles (9) agissant sur un capteur (10).This machine, comprising a carriage movable in translation and in oscillation parallel and perpendicular to a shaft carrying grinding wheels to be cut and beveled, comprises a feeler (7) adapted to come into contact with the edge of a cut-out blank (3 ), perpendicular to this section, and adapted to measure the distance L1 from the edge of the front face of the lens (3) compared to that of a plane lens for which L1 = 0, and the value of L2 which corresponds to the thickness of the glass edge. The probe (7) has an identical and concentric curvature to that of the grinding wheel (4, 11) and formed by several parallel elements (9) acting on a sensor (10).

Description

La présente invention est relative aux machines automatiques pour meuler et biseauter les verres de lunettes.The present invention relates to automatic machines for grinding and beveling spectacle lenses.

Les machines classiques pour meuler et biseauter les verres ophtalmiques comprennent un chariot de forme en U monté coulissant et oscillant sur un arbre horizontal fixe, un deuxième arbre horizontal monté rotatif perpendiculaire­ment entre les branches du chariot en U, formé de deux par­ties entre lesquelles est serré le verre à travailler, et un troisième arbre horizontal rotatif portant les différen­tes meules, à déborder et à biseauter.Conventional machines for grinding and beveling ophthalmic lenses include a U-shaped carriage slidingly mounted and oscillating on a fixed horizontal shaft, a second horizontal shaft mounted to rotate perpendicularly between the branches of the U-shaped carriage, formed of two parts between which is clamped the glass to be worked, and a third rotary horizontal shaft carrying the different grinding wheels, to overflow and bevel.

Lorsqu'une ébauche d'un verre optique à bord épais a été détourée à la forme de la monture, la tranche du verre présente une forme cylindrique et une opération de biseau­tage doit être effectuée en guidant le verre pour former sur sa tranche un biseau de section en V situé entre les bords de sa périphérie, ce biseau étant destiné à se loger dans la rainure du drageoir de la monture.When a blank of a thick rim optical lens has been cut to the shape of the frame, the edge of the lens has a cylindrical shape and a beveling operation must be carried out by guiding the lens to form a bevel of its edge. V-shaped section located between the edges of its periphery, this bevel being intended to be housed in the groove of the bezel of the frame.

L'exécution d'un tel biseau avec commande manuelle est extrêmement difficile; on a eu recours au système de "biseau libre" suivant lequel on amène la tranche de l'ébauche dans une gorge en V d'une meule et on laisse l'arbre portant le verre libre de se déplacer en translation pendant l'opération de meulage.The execution of such a bevel with manual control is extremely difficult; the "free bevel" system was used, according to which the edge of the blank is brought into a V-groove in a grinding wheel and the shaft carrying the free glass is allowed to move in translation during the operation of grinding.

Ce système ne procure cependant pas un résultat entièrement satisfaisant.However, this system does not provide a completely satisfactory result.

FR-A-2 456 304 décrit un dispositif pour mesurer la distance entre un point déterminé du contour désiré d'un verre ophtalmique et le plan tangent au pôle de la surface convexe de ce verre.FR-A-2 456 304 describes a device for measuring the distance between a determined point of the desired contour of an ophthalmic lens and the plane tangent to the pole of the convex surface of this lens.

Ce dispositif comprend un ensemble à deux palpeurs coopérant l'un avec le verre et l'autre avec le gabarit, monté sur le chariot et mobile parallèlement à l'axe du gabarit et du verre, l'un des palpeurs étant en contact avec la surface du verre.This device comprises an assembly with two feelers cooperating one with the glass and the other with the template, mounted on the carriage and movable parallel to the axis of the template and the glass, one of the feelers being in contact with the glass surface.

Au fur et à mesure que le verre tourne, le palpeur en contact avec sa surface fournit une indication en déplaçant un index devant un index gradué.As the glass rotates, the probe in contact with its surface provides an indication of moving an index in front of a graduated index.

Dans ce dispositif, le fait de ne palper qu'un seul point du verre pour un angle donné de celui-ci oblige à effectuer un calcul de correction en raison du fait que le point de meulage se déplace différemment suivant le diamètre de la meule et les formes non circulaires des montures.In this device, the fact of only palpating a single point of the glass for a given angle thereof makes it necessary to carry out a correction calculation due to the fact that the grinding point moves differently according to the diameter of the grinding wheel and the non-circular shapes of the frames.

L'invention a en conséquence pour but de réaliser une machine automatique pour meuler et biseauter les verres ophtalmiques, du type comportant un capteur et dans lequel ce calcul de correction est inutile.The object of the invention is therefore to provide an automatic machine for grinding and beveling ophthalmic lenses, of the type comprising a sensor and in which this correction calculation is unnecessary.

L'invention a également pour but de fournir un dispositif permettant de réaliser un biseau guidé sur la tranche d'un verre ophtalmique, automatiquement et avec une grande précision.The invention also aims to provide a device for making a bevel guided on the edge of an ophthalmic lens, automatically and with great precision.

L'invention a pour objet à cet effet une machine à meuler et à biseauter les verres ophtalmiques du type comprenant un chariot mobile en translation et en oscilla­tion parallèlement et perpendiculairement par rapport à un arbre portant des meules à détourer et à biseauter et un palpeur en contact avec le verre, caractérisée en ce que le palpeur est adapté pour venir en contact avec la tranche d'une ébauche détourée, perpendiculairement à cette tranche, et en ce qu'il est adapté pour mesurer la distance L1 du bord de la face avant du verre par rapport à celui d'un verre plan pour lequel L1 = 0, et la valeur L2 qui corres­pond à l'épaisseur de la tranche du verre.The subject of the invention is to this end a machine for grinding and beveling ophthalmic lenses of the type comprising a carriage movable in translation and in oscillation parallel and perpendicular to a shaft carrying grinding wheels to be cut and beveled and a feeler in contact with the glass, characterized in that the probe is adapted to come into contact with the edge of a contoured blank, perpendicular to this edge, and in that it is adapted to measure the distance L1 from the edge of the front face of glass compared to that of a flat glass for which L1 = 0, and the value L2 which corresponds to the thickness of the edge of the glass.

Suivant une autre caractéristique de l'invention, le palpeur a une suface dont la courbure est identique à celle de la meule.According to another characteristic of the invention, the probe has a surface whose curvature is identical to that of the grinding wheel.

De préférence la surface du palpeur est formée par les bords adjacents de plusieurs lames juxtaposées mobiles adaptées pour agir sur des capteurs sensibles à leurs dépla­cements.Preferably, the surface of the probe is formed by the adjacent edges of several mobile juxtaposed blades adapted to act on sensors sensitive to their movements.

Suivant un mode de réalisation ledit palpeur est disposé à côté de la meule, la courbure de sa surface étant concentrique à celle de la meule.According to one embodiment, said probe is placed next to the grinding wheel, the curvature of its surface being concentric with that of the grinding wheel.

Dans une variante, le palpeur est monté mobile au­dessus de la meule, de façon à pouvoir se déplacer perpen­diculairement à l'arbre de la meule entre une position haute, éloignée de l'ébauche, et une position basse dans laquelle il est sollicité élastiquement en contact avec la tranche de l'ébauche.In a variant, the probe is mounted movable above the grinding wheel, so that it can move perpendicular to the shaft of the grinding wheel between a position high, away from the blank, and a low position in which it is resiliently biased in contact with the edge of the blank.

D'une façon avantageuse le palpeur est constitué par trois éléments mobiles juxtaposés.Advantageously, the feeler consists of three juxtaposed mobile elements.

La description qui va suivre, en regard des dessins annexés à titre d'exemples non limitatifs, permettra de bien comprendre comment l'invention peut être mise en pratique.

  • La figure 1 est une vue schématique partielle d'une machine à meuler et à biseauter classique à laquelle est appliquée l'invention.
  • La figure 2 en est une vue en élévation et en bout.
  • La figure 3 est une vue schématique partielle à plus grande échelle montrant le positionnement de la tranche d'une ébauche sur le palpeur et l'agencement d'un mode de réalisation de celui-ci.
  • La figure 4 est une vue partielle en élévation et en bout dans le sens de la flèche F de la figure 3.
  • La figure 5 est une vue schématique partielle d'une variante dans laquelle le palpeur est monté sur le chariot de la machine.
The description which follows, with reference to the accompanying drawings by way of nonlimiting examples, will make it possible to understand clearly how the invention can be put into practice.
  • Figure 1 is a partial schematic view of a conventional grinding and beveling machine to which the invention is applied.
  • Figure 2 is an elevational and end view.
  • Figure 3 is a partial schematic view on a larger scale showing the positioning of the edge of a blank on the probe and the arrangement of an embodiment thereof.
  • FIG. 4 is a partial view in elevation and at the end in the direction of the arrow F in FIG. 3.
  • Figure 5 is a partial schematic view of a variant in which the probe is mounted on the carriage of the machine.

En se référant aux dessins et plus particulièrement aux figures 1 et 2, une machine classique à meuler et à biseauter comprend un chariot 1 de forme en U monté oscil­lant sur un arbre horizontal (non représenté) et entre les branches duquel est monté rotatif un second arbre horizontal 2 en deux parties entre lesquelles est serrée une ébauche 3 d'un verre ophtalmique qui a été détourée sur une meule 4 montée rotative sur un troisième arbre horizontal 5.Referring to the drawings and more particularly to Figures 1 and 2, a conventional grinding and beveling machine comprises a carriage 1 of U-shape mounted oscillating on a horizontal shaft (not shown) and between the branches of which is mounted a second horizontal shaft 2 in two parts between which is clamped a blank 3 of an ophthalmic lens which has been cut out on a grinding wheel 4 rotatably mounted on a third horizontal shaft 5.

Comme connu en soi, la machine comporte un capteur 6 de la position angulaire de l'ébauche 3 en rotation, et un autre capteur (non représenté) de la position du chariot 1 en translation parallèlement à l'arbre 2.As known per se, the machine comprises a sensor 6 of the angular position of the blank 3 in rotation, and another sensor (not shown) of the position of the carriage 1 in translation parallel to the shaft 2.

En fonctionnement le chariot 1 est abaissé pour amener l'ébauche 3 en contact avec la meule 4.In operation, the carriage 1 is lowered to bring the blank 3 into contact with the grinding wheel 4.

Suivant l'invention, la machine comporte un palpeur, désigné dans son ensemble par la référence 7 ayant une sur­face présentant une courbure identique et concentrique à celle de la meule 4, et monté adjacent à celle-ci sur un support approprié 8.According to the invention, the machine comprises a feeler, designated as a whole by the reference 7 having a surface having a curvature identical and concentric to that of the grinding wheel 4, and mounted adjacent to this on a suitable support 8.

Le palpeur 7, dont l'agencement interne ne fait pas partie de l'invention et qui peut être mécanique, pneuma­tiqe, magnétique, électronique ou autre, a une surface courbe formée par les tranches de plusieurs plaquettes ou minces lames mobiles parallèles adjacentes 9 montées sur champ, verticalement, agissant indépendamment sur un dispo­sitif 10 sensible à une pression s'exerçant sur elles pour fournir un signal électrique représentatif du nombre de lames sur lesquelles s'exerce cette pression.The probe 7, the internal arrangement of which is not part of the invention and which may be mechanical, pneumatic, magnetic, electronic or other, has a curved surface formed by the edges of several plates or thin adjacent parallel movable blades 9 mounted in the field, vertically, acting independently on a device 10 sensitive to a pressure exerted on them to provide an electrical signal representative of the number of blades on which this pressure is exerted.

Connaissant l'épaisseur des lames 9, le palpeur 7 peut donc fournir une mesure de la largeur de sa surface sur laquelle prend appui la tranche d'une ébauche détourée 3 amenée en contact sur elle au moyen d'un déplacement du chariot 1.Knowing the thickness of the blades 9, the feeler 7 can therefore provide a measurement of the width of its surface on which the edge of a cut blank 3 brought into contact with it bears by means of a movement of the carriage 1.

Si on amène le bord avant de l'ébauche 3 en coïnci­dence avec le bord du palpeur 7 (L1 = 0) puis qu'on le déplace en amenant le plan correspondant à un verre plan au bord du palpeur 7, celui-ci fournit les mesures de L1 et L2.If we bring the front edge of the blank 3 in coincidence with the edge of the probe 7 (L1 = 0) and then move it by bringing the plane corresponding to a flat glass to the edge of the probe 7, it provides the measurements of L1 and L2.

En faisant tourner l'ébauche 3 sur le palpeur 7 on obtient une série de mesures de L1 et L2 sur toute la péri­phérie de l'ébauche. Les signaux correspondants mémorisés dans un microprocesseur permettent alors une commande très précise du moteur déplaçant le chariot 1 en translation après avoir placé la tranche de l'ébauche sur la meule à biseauter 11.By rotating the blank 3 on the probe 7, a series of measurements of L1 and L2 is obtained over the entire periphery of the blank. The corresponding signals stored in a microprocessor then allow very precise control of the motor moving the carriage 1 in translation after having placed the edge of the blank on the beveling wheel 11.

On a représenté aux figures 3 et 4 un mode de réa­lisation d'un palpeur 17 comportant trois lames 19 montées oscillantes et agissant sur trois capteurs étanches 20. La largeur totale du palpeur correspond à l'épaisseur totale maximale d'un verre ophtalmique, soit 20 mm.FIGS. 3 and 4 show an embodiment of a feeler 17 comprising three blades 19 mounted to oscillate and acting on three sealed sensors 20. The total width of the feeler corresponds to the maximum total thickness of an ophthalmic lens, ie 20 mm.

Le palpeur est limité par des butées latérales 21 pour détecter les faces avant et arrière de l'ébauche.The probe is limited by lateral stops 21 to detect the front and rear faces of the blank.

Dans ce mode de réalisation une partie de la tranche de l'ébauche 3 est toujours en contact avec la lame centrale 19. On effectuera une lecture sur le palpeur des mesures de la face avant de l'ébauche pour une révolution complète de celle-ci, puis on procèdera de même pour la face arrière. Les mesures lues sur le palpeur seront mémorisées pour chaque angle lu par le capteur 6 de position angulaire de l'ébauche et utilisées ensuite par le micro­processeur pour commander les déplacements du chariot en translation pour l'exécution du biseau sur la meule 11.In this embodiment, part of the edge of the blank 3 is always in contact with the central blade 19. A measurement will be taken on the probe of the front face of the blank for a complete revolution thereof. , then we will proceed in the same way for the rear face. The measurements read on the probe will be memorized for each angle read by the angular position sensor 6 of the blank and then used by the microprocessor to control the movements of the carriage in translation for the execution of the bevel on the grinding wheel 11.

Dans la variante représentée à la figure 5, le palpeur 27 peut être monté sur le chariot 1. Cependant, bien que procurant le même résultat, cette variante nécessite un mécanisme supplémentaire sur le chariot pour relever et abaisser le palpeur en contact avec l'ébauche, rendant cette solution plus coûteuse sans apporter un avantage particulier.In the variant shown in Figure 5, the probe 27 can be mounted on the carriage 1. However, although providing the same result, this variant requires an additional mechanism on the carriage to raise and lower the probe in contact with the blank , making this solution more expensive without providing any particular advantage.

On a indiqué par des flèches à la figure 3 le cycle de fonctionnement de la machine, à partir de la fin du détourage de l'ébauche (position A), translation sur le palpeur B, C, D, relevage E, translation sur la meule à biseauter F et formation du biseau G.The operating cycle of the machine has been indicated by arrows in FIG. 3, from the end of the trimming of the blank (position A), translation on the probe B, C, D, lifting E, translation on the bevel wheel F and bevel G.

Comme le comprendront les techniciens il est bien entendu prévu un asservissement de l'entraînement du chariot en translation afin de positionner l'ébauche sur le palpeur.As will be understood by the technicians, it is of course provided for servo-control of the carriage drive in translation in order to position the blank on the probe.

On remarquera àgalement que, du fait que le rayon du palpeur est identique à celui de la meule, le dispositif tient compte du point de meulage et permet de lire une quan­tité théoriquement illimitée de mesures sur la totalité de la périphérie du verre, supprimant ainsi le calcul de correction.It will also be noted that, since the radius of the probe is identical to that of the grinding wheel, the device takes account of the grinding point and makes it possible to read a theoretically unlimited quantity of measurements over the entire periphery of the glass, thus eliminating the correction calculation.

Il est enfin à souligner que l'invention, permet de supprimer la réalisation d'un biseau libre en passant direc­tement de la phase de détourage à celle du biseau guidé tout en laissant cependant la possibilité de réaliser un biseau libre si on le désire.Finally, it should be emphasized that the invention makes it possible to suppress the production of a free bevel by passing directly from the trimming phase to that of the guided bevel while nevertheless leaving the possibility of producing a free bevel if desired.

Claims (7)

1. Machine à meuler et à biseauter les verres ophtalmiques, du type comprenant un chariot mobile en trans­lation et en oscillation parallèlement et perpendiculaire­ment par rapport à un arbre portant des meules à détourer et à biseauter et un palpeur en contact avec le verre, caractérisé en ce que le palpeur (7, 17) est adapté pour venir en contact avec la tranche d'une ébauche détourée (3), perpendiculairement à cette tranche, et en ce qu'il est adapté pour mesurer la distance L1 du bord de la face avant du verre (3) par rapport à celui d'un verre plan pour lequel L1 = 0, et la valeur de L2 qui correspond à l'épaisseur de la tranche du verre.1. Machine for grinding and beveling ophthalmic lenses, of the type comprising a carriage movable in translation and in oscillation parallel and perpendicular to a shaft carrying grinding wheels for trimming and beveling and a feeler in contact with the glass, characterized in that the probe (7, 17) is adapted to come into contact with the edge of a clipped blank (3), perpendicular to this edge, and in that it is adapted to measure the distance L1 from the edge of the face front of the glass (3) compared to that of a flat glass for which L1 = 0, and the value of L2 which corresponds to the thickness of the edge of the glass. 2. Machine suivant la revendication 1, caractérisée en ce que le palpeur (7, 17) a une surface dont la courbure est identique à celle de la meule (4, 11).2. Machine according to claim 1, characterized in that the feeler (7, 17) has a surface whose curvature is identical to that of the grinding wheel (4, 11). 3. Machine suivant la revendication 2, caractérisée en ce que la surface du palpeur (7, 17) est formée par les bords adjacents de plusieurs éléments (9, 19) juxtaposés mobiles ou vibrants adaptés pour agir sur des capteurs (10, 20) sensibles à leur déplacements.3. Machine according to claim 2, characterized in that the surface of the probe (7, 17) is formed by the adjacent edges of several elements (9, 19) juxtaposed mobile or vibrating adapted to act on sensors (10, 20) sensitive to their movements. 4. Machine suivant la revendication 3, caractérisée en ce que le palpeur (7, 17) est disposé à côté de la meule (4, 11), la courbure de sa surface étant concentrique à celle de la meule.4. Machine according to claim 3, characterized in that the feeler (7, 17) is arranged next to the grinding wheel (4, 11), the curvature of its surface being concentric with that of the grinding wheel. 5. Machine suivant la revendication 3, caractérisée en ce que le palpeur (17) comporte trois éléments (19) adap­tés pour agir chacun sur un capteur étanche (20).5. Machine according to claim 3, characterized in that the probe (17) comprises three elements (19) adapted to act each on a sealed sensor (20). 6. Machine suivant l'une ou l'autre des revendica­tions 3 ou 5, dans laquelle le palpeur est monté mobile sur le chariot (1) de la machine, caractérisée en ce que le palpeur (27) est adapté pour se déplacer perpendiculairement à l'arbre (5) de la meule (4, 11) entre une position haute, éloignée de l'ébauche (3), et une position basse dans la­quelle il est sollicité élastiquement en contact avec la tranche de l'ébauche.6. Machine according to either of Claims 3 or 5, in which the probe is mounted movably on the carriage (1) of the machine, characterized in that the probe (27) is adapted to move perpendicularly to the shaft (5) of the grinding wheel (4, 11) between a high position, distant from the blank (3), and a low position in which it is resiliently biased in contact with the edge of the blank. 7. Machine suivant l'une quelconque des revendica­tions 1 à 6, caractérisée en ce que les capteurs sont méca­niques, magnétiques, électroniques à résistivité variable ou autres.7. Machine according to any one of claims 1 to 6, characterized in that the sensors are mechanical, magnetic, electronic with variable resistivity or others.
EP88400493A 1987-03-05 1988-03-02 Ophthalmic glasses bevelling machines Expired - Lifetime EP0281480B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8702992 1987-03-05
FR8702992A FR2611560B1 (en) 1987-03-05 1987-03-05 IMPROVEMENTS IN GRINDING AND BEVELING MACHINES FOR OPHTHALMIC LENSES

Publications (2)

Publication Number Publication Date
EP0281480A1 true EP0281480A1 (en) 1988-09-07
EP0281480B1 EP0281480B1 (en) 1991-04-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400493A Expired - Lifetime EP0281480B1 (en) 1987-03-05 1988-03-02 Ophthalmic glasses bevelling machines

Country Status (6)

Country Link
US (1) US4829715A (en)
EP (1) EP0281480B1 (en)
JP (1) JPH0763928B2 (en)
DE (2) DE281480T1 (en)
ES (1) ES2021444B3 (en)
FR (1) FR2611560B1 (en)

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Also Published As

Publication number Publication date
FR2611560A1 (en) 1988-09-09
FR2611560B1 (en) 1992-10-02
JPS63245362A (en) 1988-10-12
US4829715A (en) 1989-05-16
DE3862325D1 (en) 1991-05-16
ES2021444B3 (en) 1991-11-01
JPH0763928B2 (en) 1995-07-12
DE281480T1 (en) 1989-06-22
EP0281480B1 (en) 1991-04-10

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