EP0391757A1 - Device for recalibrating an ophthalmic lens grinding machine for compensating the grinding-wheel abrasion - Google Patents

Device for recalibrating an ophthalmic lens grinding machine for compensating the grinding-wheel abrasion Download PDF

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Publication number
EP0391757A1
EP0391757A1 EP90400737A EP90400737A EP0391757A1 EP 0391757 A1 EP0391757 A1 EP 0391757A1 EP 90400737 A EP90400737 A EP 90400737A EP 90400737 A EP90400737 A EP 90400737A EP 0391757 A1 EP0391757 A1 EP 0391757A1
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EP
European Patent Office
Prior art keywords
grinding wheel
grinding
wear
jack
standard disc
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Granted
Application number
EP90400737A
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German (de)
French (fr)
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EP0391757B1 (en
Inventor
Michel Jean Marcel Lecerf
Jean-Pierre Marie Fernand Langlois
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Briot International SA
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Briot International SA
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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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/18—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B24B9/146—Accessories, e.g. lens mounting devices

Definitions

  • the present invention relates to machines for grinding ophthalmic lenses and it relates more particularly to the control of the wear of the grinding wheel of such a machine.
  • a machine for grinding or trimming ophthalmic lenses usually comprises a first shaft, fixed and horizontal, on which a U-shaped carriage is mounted oscillating and sliding through its intermediate part, a second shaft parallel to the first and carrying a rotary grinding wheel, and a third shaft, parallel to the preceding ones, rotatably mounted on the ends of the branches of the carriage, divided into two parts between them in order to clamp between them a blank of grinding glass according to a template carried on a extension of this third tree outside said branches and resting on a key.
  • said button is mounted adjustable perpendicular to the shaft of the grinding wheel, on a rod of a jack and secured to a position sensor connected to an electronic device for control of said cylinder.
  • This electronic device can be associated with a microprocessor having in memory the characteristics of a certain number of mounts.
  • the distance between the axis of the grinding wheel and that of a given template is a known value, but this value decreases as the progressive wear of the grinding wheel, the diameter of the ground glass increasing conversely, due to the fact that the jack imposes the theoretical spacing during the rotation of the blank.
  • the operator is thus forced to carry out manual interventions to measure this wear and carry out a new calibration of the grinder by setting the key.
  • the document EP-A-0 235 021 describes and represents a machine for grinding ophthalmic lenses which, in one of the embodiments shown in the figures comprises an adjustable support button for a template connected to a position sensor and mounted on a mechanical jack to compensate for the wear of the grinding wheel.
  • an adjustable support button for a template connected to a position sensor and mounted on a mechanical jack to compensate for the wear of the grinding wheel.
  • a disc is used. standard which is mounted on the axis in place of a rough glass to be ground, then the distance between the two axes is measured by bringing the standard disc into contact with the grinding wheel.
  • the machine comprises arithmetic means for calculating the amount of wear of the grinding wheel as a function of a measurement carried out by the measuring means, adjustment means for adjusting the center distance between the axes of the drive shafts of the grinding wheel and of the glass, and control means for controlling the adjustment means as a function of the amount of wear and thereby achieving wear correction.
  • the adjustment method proposed in this document is however difficult and time-consuming to implement, because it requires setting up a standard disc instead of a glass blank each time it is desired to carry out an operation of correction.
  • the object of the invention is to provide a method and a device making it possible to evaluate the wear of the grinding wheel in a simple and rapid manner and to automatically adjust the key to compensate for this wear by reducing the center distance to its initial value.
  • the invention provides a method for recalibrating a machine for grinding ophthalmic lenses of the type comprising an adjustable template support button connected to a position sensor and mounted on a jack controlled by an electronic device, depending on the wear of the grinding wheel, in which a standard disc is fixed on one of the axes whose spacing must be checked, characterized in that the standard disc is fixed on the axis of the grinding wheel, coaxially to this one, and we measures said spacing by bringing the standard disc into contact with a finished glass.
  • the invention also provides a device for recalibrating a machine for grinding ophthalmic lenses of the type comprising an adjustable template support button connected to a position sensor and mounted on a jack controlled by an electronic device, to compensate for the wear of the grinding wheel, and which comprises a standard disc mounted on one of the two axes, the spacing of which must be measured and compensated automatically, characterized in that the standard disc is mounted on the axis of the grinding wheel, coaxially to this one.
  • the standard disc is advantageously mounted against the grinding wheel.
  • the cylinder is connected to a microprocessor comprising means for displaying the distance between the axes of the grinding wheel and the glass, means for controlling the cylinder, and adapted to automatically compensate for the difference between the value of said distance and its value initial before wear of the grinding wheel.
  • the method and the device according to the invention allow regular recalibration of the grinding machine without having to put in place a standard disc in place of a finished glass or a glass blank, the operation recalibration can be carried out by simple lateral movement of the carriage in order to bring the finished glass blank into contact with the external cylindrical surface of the standard disc, the latter being able to remain in place permanently on the axis of the grinding wheel.
  • the single figure is a schematic plan view from above of a grinding machine controlled by a microprocessor, comprising a recalibration device according to the invention.
  • a conventional grinding machine comprises a carriage 1 of general U shape, having an intermediate part 2 and two parallel wings 3.
  • the carriage 1 is mounted to slide and oscillate on a horizontal shaft 4 extending in its intermediate part 2 perpendicular to the wings 3.
  • a rotary shaft 5 in two parts, at least one of which has an extension 6 extending beyond one of the branches 3.
  • a blank 7 of a glass to be trimmed is centered and clamped between the two half-shafts 5 between the wings 3 and a template 8 is mounted, centered, on the extension 6 of the shaft 5.
  • the template 8 rests on a button 9 fixed on a rod 10 of a motor actuator 11 mounted on the frame 12 of the machine.
  • a grinding wheel 13 is mounted on a rotary shaft 14 driven by a motor (not shown).
  • the rod 10 of the jack 11 carries a cursor 15 in contact with a linear resistor 16 parallel to the rod 10, thus forming a potentiometer producing an electrical signal as a function of the position of the button 9, which is applied by conductors 17 to a electronic device 18 with microprocessor connected itself by a conductor 19 to the jack 11.
  • the grinding machine described above is known as a whole, in particular from document FR-A-2 481 635.
  • a standard disc 20 having a diameter equal to the pitch circle P of the grinding wheel 13 is mounted coaxially against the latter on the shaft 14.
  • the distance D between the axes of the shafts 5 and 14 corresponds to a given value a which is determined by the contact of the template 8 with the key 9 and is equal to the sum of the radius of the pitch circle P of the grinding wheel, that is ie the standard disc 20, and the desired radius of the glass 7 after grinding, that is to say the radius of the template 8, and it is understood that this is valid for all the spokes of the glass, or of the template.
  • the electronic device 18 means 21 for displaying the value a , as well as a button 22 for controlling the jack 11.
  • the finished ground glass 7 is brought into contact with the standard disc 20.
  • the value a remains displayed by the device 21.
  • the diameter of the glass having increased the value displayed by the device 21 will be greater than a .
  • the button 9 is brought back into contact with the template 8 and the device 21 then displays the new value of D.
  • the electronic device 18 is adapted to automatically actuate the jack 11 in order to keep the button 9 in contact with the template, this device will read the new value of D and compare it with the initial value and automatically carry out the desired correction.
  • the standard disc 20 can be removably mounted on the shaft 14.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

According to the method, the distance between the shaft (14) of the grinding wheel (13) and the shaft (5) carrying a finished lens (7) in contact with the said grinding wheel is measured by means of a microprocessor (18) for controlling the actuator, by bringing the tip (9) into contact with the template (8), a gauge disc (20) being mounted coaxially with the grinding wheel (13) on the shaft (14) of the latter in order to measure the centre distance by bringing the gauge disc into contact with a finished lens. <IMAGE>

Description

La présente invention concerne les machines à meuler les verres ophtalmiques et elle est plus particu­lièrement relative au contrôle de l'usure de la meule d'une telle machine.The present invention relates to machines for grinding ophthalmic lenses and it relates more particularly to the control of the wear of the grinding wheel of such a machine.

Comme connu en soi, une machine à meuler, ou à détourer les verres ophtalmiques comprend habituellement un premier arbre, fixe et horizontal, sur lequel un chariot de forme en U est monté oscillant et coulissant par sa partie intermédiaire, un second arbre parallèle au premier et portant une meule rotative, et un troisième arbre, parallèle aux précédents, monté rotatif sur les extrémités des branches du chariot, divisé en deux parties entre celles-ci afin de serrer entre elles une ébauche de verre à meuler suivant un gabarit porté sur un prolongament de ce troisième arbre à l'extérieur desdites branches et reposant sur une touche.As known per se, a machine for grinding or trimming ophthalmic lenses usually comprises a first shaft, fixed and horizontal, on which a U-shaped carriage is mounted oscillating and sliding through its intermediate part, a second shaft parallel to the first and carrying a rotary grinding wheel, and a third shaft, parallel to the preceding ones, rotatably mounted on the ends of the branches of the carriage, divided into two parts between them in order to clamp between them a blank of grinding glass according to a template carried on a extension of this third tree outside said branches and resting on a key.

Suivant le brevet français n° 2.481.635 au nom de la demanderesse, ladite touche est montée réglable per­pendiculairement à l'arbre de la meule, sur une tige d'un vérin et solidaire d'un capteur de position relié à un dispositif électronique de commande dudit vérin.According to French Patent No. 2,481,635 in the name of the plaintiff, said button is mounted adjustable perpendicular to the shaft of the grinding wheel, on a rod of a jack and secured to a position sensor connected to an electronic device for control of said cylinder.

Ce dispositif électronique peut être associé à un microprocesseur ayant en mémoire les caractéristiques d'un certain nombre de montures.This electronic device can be associated with a microprocessor having in memory the characteristics of a certain number of mounts.

A l'origine, lors de la mise en service de la machine à meuler, la distance entre l'axe de la meule et celui d'un gabarit donné est une valeur connue, mais cette valeur diminue au fur et à mesure de l'usure progressive de la meule, le diamètre du verre meulé augmentant à l'inverse, du fait que le vérin impose les entraxes théoriques au cours de la rotation de l'ébauche.Originally, when the grinding machine was put into service, the distance between the axis of the grinding wheel and that of a given template is a known value, but this value decreases as the progressive wear of the grinding wheel, the diameter of the ground glass increasing conversely, due to the fact that the jack imposes the theoretical spacing during the rotation of the blank.

L'opérateur est ainsi contraint de procéder à des interventions manuelles pour mesurer cette usure et procéder à un nouvel étalonnage de la meuleuse par calage de la touche.The operator is thus forced to carry out manual interventions to measure this wear and carry out a new calibration of the grinder by setting the key.

Le document EP-A-0 235 021 décrit et représente une machine à meuler les verres ophtalmiques qui, dans l'un des modes de réalisation représenté aux figures, comporte une touche réglable d'appui pour un gabarit relié à un capteur de position et montée sur un vérin mécanique pour compenser l'usure de la meule. Afin de permettre d'évaluer l'usure de la meule et de procéder automatiquement à un réglage de la touche, pour compenser l'usure en modi­fiant l'entraxe entre les axes qui portent respectivement la meule et le gabarit, on utilise un disque-étalon qui est monté sur l'axe à la place d'une ébauche de verre à meuler puis on mesure l'écartement entre les deux axes en amenant le disque-étalon en contact avec la meule. Outre ces moyens pour mesurer indirectement le diamètre extérieur de la meule, la machine comporte des moyens arithmétiques pour calculer la quantité d'usure de la meule en fonction d'une mesure effectuée par les moyens de mesure, des moyens de réglage pour régler l'entraxe entre les axes des arbres d'entraînement de la meule et du verre, et des moyens de commande pour commander les moyens de réglage en fonction de la quantité d'usure et pour réaliser ainsi une correction de l'usure.The document EP-A-0 235 021 describes and represents a machine for grinding ophthalmic lenses which, in one of the embodiments shown in the figures comprises an adjustable support button for a template connected to a position sensor and mounted on a mechanical jack to compensate for the wear of the grinding wheel. In order to make it possible to assess the wear of the grinding wheel and to automatically adjust the key, to compensate for the wear by modifying the distance between the axes between the axes which respectively carry the grinding wheel and the template, a disc is used. standard which is mounted on the axis in place of a rough glass to be ground, then the distance between the two axes is measured by bringing the standard disc into contact with the grinding wheel. In addition to these means for indirectly measuring the outside diameter of the grinding wheel, the machine comprises arithmetic means for calculating the amount of wear of the grinding wheel as a function of a measurement carried out by the measuring means, adjustment means for adjusting the center distance between the axes of the drive shafts of the grinding wheel and of the glass, and control means for controlling the adjustment means as a function of the amount of wear and thereby achieving wear correction.

Le procédé de réglage proposé dans ce document est toutefois difficile et long à mettre en oeuvre, car il nécessite de mettre en place un disque-étalon à la place d'une ébauche de verre à chaque fois que l'on désire effectuer une opération de correction.The adjustment method proposed in this document is however difficult and time-consuming to implement, because it requires setting up a standard disc instead of a glass blank each time it is desired to carry out an operation of correction.

Le but de l'invention est de fournir un procédé et un dispositif permettant d'évaluer de manière simple et rapide l'usure de la meule et de procéder automatique­ment à un réglage de la touche pour compenser cette usure en ramenant l'entraxe à sa valeur initiale.The object of the invention is to provide a method and a device making it possible to evaluate the wear of the grinding wheel in a simple and rapid manner and to automatically adjust the key to compensate for this wear by reducing the center distance to its initial value.

Dans ce but, l'invention propose un procédé pour réétalonner une machine à meuler des verres ophtal­miques du type comportant une touche réglable d'appui de gabarit reliée à un capteur de position et montée sur un vérin commandé par un dispositif électronique, en fonction de l'usure de la meule, dans lequel on fixe un disque-­étalon sur l'un des axes dont l'écartement doit être vérifié, caractérisé en ce que l'on fixe le disque-étalon sur l'axe de la meule, coaxialement à celle-ci, et on mesure ledit écartement en amenant le disque-étalon en contact avec un verre fini.To this end, the invention provides a method for recalibrating a machine for grinding ophthalmic lenses of the type comprising an adjustable template support button connected to a position sensor and mounted on a jack controlled by an electronic device, depending on the wear of the grinding wheel, in which a standard disc is fixed on one of the axes whose spacing must be checked, characterized in that the standard disc is fixed on the axis of the grinding wheel, coaxially to this one, and we measures said spacing by bringing the standard disc into contact with a finished glass.

L'invention propose également un dispositif de réétalonnage d'une machine à meuler les verres ophtalmiques du type comportant une touche réglable d'appui de gabarit reliée à un capteur de position et montée sur un vérin commandé par un dispositif électronique, pour compenser l'usure de la meule, et qui comprend un disque-étalon monté sur l'un des deux axes dont l'écartement doit être mesuré et compensé automatiquement, caractérisé en ce que le disque-étalon est monté sur l'axe de la meule, coaxialement à celle-ci.The invention also provides a device for recalibrating a machine for grinding ophthalmic lenses of the type comprising an adjustable template support button connected to a position sensor and mounted on a jack controlled by an electronic device, to compensate for the wear of the grinding wheel, and which comprises a standard disc mounted on one of the two axes, the spacing of which must be measured and compensated automatically, characterized in that the standard disc is mounted on the axis of the grinding wheel, coaxially to this one.

Le disque-étalon est avantageusement monté contre la meule.The standard disc is advantageously mounted against the grinding wheel.

Le vérin est relié à un microprocesseur compor­tant des moyens d'affichage de la distance entre les axes de la meule et du verre, des moyens de commande du vérin, et adapté pour compenser automatiquement l'écart entre la valeur de ladite distance et sa valeur initiale avant usure de la meule.The cylinder is connected to a microprocessor comprising means for displaying the distance between the axes of the grinding wheel and the glass, means for controlling the cylinder, and adapted to automatically compensate for the difference between the value of said distance and its value initial before wear of the grinding wheel.

Le procédé et le dispositif selon l'invention permettent d'effectuer régulièrement un réétalonnage de la machine à meuler sans avoir à mettre en place un disque-­étalon à la place d'un verre fini ou d'une ébauche de verre, l'opération de réétalonnage pouvant être effectuée par simple déplacement latéral du chariot afin d'amener l'ébauche de verre fini en contact avec la surface cylin­drique extérieure du disque-étalon, ce dernier pouvant rester en place à demeure sur l'axe de la meule.The method and the device according to the invention allow regular recalibration of the grinding machine without having to put in place a standard disc in place of a finished glass or a glass blank, the operation recalibration can be carried out by simple lateral movement of the carriage in order to bring the finished glass blank into contact with the external cylindrical surface of the standard disc, the latter being able to remain in place permanently on the axis of the grinding wheel.

La description qui va suivre, en regard du dessin annexé à titre d'exemple non limitatif, permettra de bien comprendre comment l'invention peut être mise en pratique.The following description, with reference to the attached drawing by way of nonlimiting example, will make it possible to understand clearly how the invention can be put into practice.

Dans ce dessin, la figure unique est une vue schématique en plan de dessus d'une machine à meuler pilotée par un microprocesseur, comportant un dispositif de réétalonnage selon l'invention.In this drawing, the single figure is a schematic plan view from above of a grinding machine controlled by a microprocessor, comprising a recalibration device according to the invention.

En se référant à la figure, une machine à meuler classique comprend un chariot 1 de forme générale en U, ayant une partie intermédiaire 2 et deux ailes paral­lèles 3.Referring to the figure, a conventional grinding machine comprises a carriage 1 of general U shape, having an intermediate part 2 and two parallel wings 3.

Le chariot 1 est monté coulissant et oscillant sur un arbre horizontal 4 s'étendant dans sa partie inter­médiaire 2 perpendiculairement aux ailes 3.The carriage 1 is mounted to slide and oscillate on a horizontal shaft 4 extending in its intermediate part 2 perpendicular to the wings 3.

Entre les ailes 3 du chariot 1 est monté un arbre rotatif 5 en deux parties dont l'une au moins présente un prolongement 6 s'étendant au delà de l'une des branches 3.Between the wings 3 of the carriage 1 is mounted a rotary shaft 5 in two parts, at least one of which has an extension 6 extending beyond one of the branches 3.

Une ébauche 7 d'un verre à détourer est centrée et serrée entre les deux demi-arbres 5 entre les ailes 3 et un gabarit 8 est monté, centré, sur le prolongement 6 de l'arbre 5.A blank 7 of a glass to be trimmed is centered and clamped between the two half-shafts 5 between the wings 3 and a template 8 is mounted, centered, on the extension 6 of the shaft 5.

Le gabarit 8 repose en appui sur une touche 9 fixée sur une tige 10 d'un vérin à moteur 11 monté sur le bâti 12 de la machine.The template 8 rests on a button 9 fixed on a rod 10 of a motor actuator 11 mounted on the frame 12 of the machine.

Une meule 13 est montée sur un arbre rotatif 14 entraîné par un moteur (non représenté).A grinding wheel 13 is mounted on a rotary shaft 14 driven by a motor (not shown).

La tige 10 du vérin 11 porte un curseur 15 en contact avec une résistance linéaire 16 parallèle à la tige 10, formant ainsi un potentiomètre produisant un signal électrique en fonction de la position de la touche 9, qui est appliqué par des conducteurs 17 à un dispositif électronique 18 à microprocesseur relié lui-même par un conducteur 19 au vérin 11.The rod 10 of the jack 11 carries a cursor 15 in contact with a linear resistor 16 parallel to the rod 10, thus forming a potentiometer producing an electrical signal as a function of the position of the button 9, which is applied by conductors 17 to a electronic device 18 with microprocessor connected itself by a conductor 19 to the jack 11.

La machine à meuler décrite ci-dessus est connue dans son ensemble, notamment du document FR-A-2 481 635.The grinding machine described above is known as a whole, in particular from document FR-A-2 481 635.

Suivant l'invention, un disque-étalon 20 ayant un diamètre égale au cercle primitif P de la meule 13 est monté coaxialement contre celle-ci sur l'arbre 14.According to the invention, a standard disc 20 having a diameter equal to the pitch circle P of the grinding wheel 13 is mounted coaxially against the latter on the shaft 14.

La distance D entre les axes des arbres 5 et 14 correspond à une valeur donnée a qui est déterminée par le contact du gabarit 8 avec la touche 9 et est égale à la somme du rayon du cercle primitif P de la meule, c'est-à-­dire du disque-étalon 20, et du rayon désiré du verre 7 après meulage, c'est-à-dire le rayon du gabarit 8, et on comprend que ceci est valable pour tous les rayons du verre, ou du gabarit.The distance D between the axes of the shafts 5 and 14 corresponds to a given value a which is determined by the contact of the template 8 with the key 9 and is equal to the sum of the radius of the pitch circle P of the grinding wheel, that is ie the standard disc 20, and the desired radius of the glass 7 after grinding, that is to say the radius of the template 8, and it is understood that this is valid for all the spokes of the glass, or of the template.

En conséquence, il est prévu sur le dispositif électronique 18 des moyens 21 d'affichage de la valeur a, ainsi qu'un bouton 22 de commande du vérin 11.Consequently, there are provided on the electronic device 18 means 21 for displaying the value a , as well as a button 22 for controlling the jack 11.

On comprend en effet qu'à l'usure progressive de la meule 13 correspond une augmentation égale du diamètre du verre 7 après meulage.It is in fact understood that the progressive wear of the grinding wheel 13 corresponds to an equal increase in the diameter of the glass 7 after grinding.

Par suite, pour vérifier l'état d'usure de la meule, on amène le verre meulé fini 7 en contact avec le disque-étalon 20.Consequently, to check the state of wear of the grinding wheel, the finished ground glass 7 is brought into contact with the standard disc 20.

Si la meule 13 ne présente aucune usure, la valeur a reste affichée par le dispositif 21.If the grinding wheel 13 shows no wear, the value a remains displayed by the device 21.

Dans le cas contraire, le diamètre du verre ayant augmenté, la valeur affichée par le dispositif 21 sera supérieure à a.Otherwise, the diameter of the glass having increased, the value displayed by the device 21 will be greater than a .

En réglant la position du vérin 11 au moyen du bouton de commande 22, on ramène la touche 9 en contact avec le gabarit 8 et le dispositif 21 affiche alors la nou­velle valeur de D.By adjusting the position of the jack 11 by means of the control button 22, the button 9 is brought back into contact with the template 8 and the device 21 then displays the new value of D.

Si le dispositif électronique 18 est adapté pour actionner automatiquement le vérin 11 afin de maintenir la touche 9 en contact avec le gabarit, ce dispositif lira la nouvelle valeur de D et la comparera à la valeur initiale et effectuera automatiquement la correction voulue.If the electronic device 18 is adapted to automatically actuate the jack 11 in order to keep the button 9 in contact with the template, this device will read the new value of D and compare it with the initial value and automatically carry out the desired correction.

On comprend, bien entendu,que le disque-étalon 20 peut être monté amovible sur l'arbre 14.It is understood, of course, that the standard disc 20 can be removably mounted on the shaft 14.

Claims (4)

1.- Procédé pour réétalonner une machine à meuler des verres ophtalmiques du type comportant une touche réglable (9) d'appui de gabarit (8) reliée à un capteur de position et montée sur un vérin (10, 11) commandé par un dispositif électronique, en fonction de l'usure de la meule (13), dans lequel on fixe un disque-étalon (20) sur l'un des axes (5, 14) dont l'écartement (D) doit être vérifié, caractérisé en ce que l'on fixe le disque-étalon (20) sur l'axe (14) de la meule (13), coaxialement à celle-­ci, et on mesure ledit écartement (D) en amenant le disque-­étalon (20) en contact avec un verre fini (7).1.- Method for recalibrating a machine for grinding ophthalmic lenses of the type comprising an adjustable button (9) for template support (8) connected to a position sensor and mounted on a jack (10, 11) controlled by a device electronic, depending on the wear of the grinding wheel (13), in which a standard disk (20) is fixed on one of the axes (5, 14) whose spacing (D) must be checked, characterized in what the standard disc (20) is fixed to the axis (14) of the grinding wheel (13), coaxial to the latter, and said spacing (D) is measured by bringing the standard disc (20) in contact with a finished glass (7). 2.- Dispositif de réétalonnage d'une machine à meuler les verres ophtalmiques du type comportant une touche réglable (9) d'appui de gabarit (8) reliée à un capteur de position et montée sur un vérin (10, 11) commandé par un dispositif électronique, pour compenser l'usure de la meule (13), et qui comprend un disque-étalon (20) monté sur l'un des deux axes (5,14) dont l'écartement (D) doit être mesuré et compensé automatiquement, caractérisé en ce que le disque-étalon (20) est monté sur l'axe (14) de la meule (13), coaxialement à celle-ci.2.- Recalibration device for a machine for grinding ophthalmic lenses of the type comprising an adjustable button (9) for template support (8) connected to a position sensor and mounted on a jack (10, 11) controlled by an electronic device, to compensate for the wear of the grinding wheel (13), and which comprises a standard disc (20) mounted on one of the two axes (5,14) whose spacing (D) must be measured and automatically compensated, characterized in that the standard disc (20) is mounted on the axis (14) of the grinding wheel (13), coaxial therewith. 3.- Dispositif selon la revendication 2, caractérisé en ce que le disque-étalon (20) est monté contre la meule (13).3.- Device according to claim 2, characterized in that the standard disc (20) is mounted against the grinding wheel (13). 4.- Dispositif selon la revendication 2, caracté­risé en ce que le vérin (11) est relié à un microprocesseur (18) comportant des moyens (21) d'affichage de la distance (D) entre les axes de la meule (13) et du verre (7), des moyens (22) de commande du vérin (11), et adapté pour compenser automatiquement l'écart entre la valeur de ladite distance (D) et sa valeur initiale avant usure de la meule (13).4.- Device according to claim 2, characterized in that the jack (11) is connected to a microprocessor (18) comprising means (21) for displaying the distance (D) between the axes of the grinding wheel (13) and glass (7), means (22) for controlling the jack (11), and adapted to automatically compensate for the difference between the value of said distance (D) and its initial value before wear of the grinding wheel (13).
EP90400737A 1989-03-23 1990-03-19 Device for recalibrating an ophthalmic lens grinding machine for compensating the grinding-wheel abrasion Expired - Lifetime EP0391757B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8903831 1989-03-23
FR8903831A FR2644718A1 (en) 1989-03-23 1989-03-23 DEVICE FOR RE-CALIBRATING A MACHINE FOR GRINDING OPHTHALMIC GLASSES TO REPAIR THE WEAR OF THE WHEEL

Publications (2)

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EP0391757A1 true EP0391757A1 (en) 1990-10-10
EP0391757B1 EP0391757B1 (en) 1993-01-27

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EP90400737A Expired - Lifetime EP0391757B1 (en) 1989-03-23 1990-03-19 Device for recalibrating an ophthalmic lens grinding machine for compensating the grinding-wheel abrasion

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US (1) US5161333A (en)
EP (1) EP0391757B1 (en)
DE (2) DE391757T1 (en)
FR (1) FR2644718A1 (en)

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DE4317571A1 (en) * 1992-05-26 1994-01-13 Wernicke & Co Gmbh Automatically controlled machining device for spectacle lens edge
FR2697769A1 (en) * 1992-11-10 1994-05-13 Buchmann Optical Eng Automatic machine for grinding and beveling ophthalmic lenses.
EP0744246A1 (en) * 1995-05-24 1996-11-27 ESSILOR INTERNATIONAL (Compagnie Générale d'Optique) Positioning gauge for setting-up an ophthalimic lens grinding machine and corresponding setting-up method

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DE4214326A1 (en) * 1992-04-30 1993-11-04 Wernicke & Co Gmbh DEVICE FOR EDGE PROCESSING OF EYE GLASSES
FR2691663B1 (en) * 1992-05-26 1996-10-11 Essilor Int METHOD FOR REDEIVING GRINDING WHEELS, DISC AND MACHINE FOR ITS IMPLEMENTATION.
FR2699445B1 (en) * 1992-12-18 1995-03-03 Essilor Int Method for checking the suitability of a grinding glass for a spectacle frame on a grinder.
FR2702409B1 (en) * 1993-03-11 1995-05-05 Buchmann Optical Eng Ophthalmic lens grinding machine comprising means for controlling the tightening value of the blank of the grinding glass.
DE4320934C2 (en) * 1993-06-24 1995-04-20 Wernicke & Co Gmbh Spectacle lens edge grinding machine
FR2706800B1 (en) * 1993-06-25 1995-11-03 Essilor Int
FR2711331B1 (en) * 1993-10-19 1996-01-26 Essilor Int Overflow machine for spectacle lenses.
FR2717413B1 (en) * 1994-03-15 1996-05-15 Essilor Int Method for determining the restitution error of an overflow machine with which a contour reading device is associated, and application to the self-calibration of the assembly.
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DE19616572C2 (en) * 1995-08-26 1998-03-26 Wernicke & Co Gmbh Method and device for measuring a spectacle frame or a spectacle lens or a shaped pane
US5713784A (en) * 1996-05-17 1998-02-03 Mark A. Miller Apparatus for grinding edges of a glass sheet
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DE4317571A1 (en) * 1992-05-26 1994-01-13 Wernicke & Co Gmbh Automatically controlled machining device for spectacle lens edge
FR2697769A1 (en) * 1992-11-10 1994-05-13 Buchmann Optical Eng Automatic machine for grinding and beveling ophthalmic lenses.
EP0744246A1 (en) * 1995-05-24 1996-11-27 ESSILOR INTERNATIONAL (Compagnie Générale d'Optique) Positioning gauge for setting-up an ophthalimic lens grinding machine and corresponding setting-up method
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Also Published As

Publication number Publication date
US5161333A (en) 1992-11-10
FR2644718B1 (en) 1994-07-13
FR2644718A1 (en) 1990-09-28
DE69000811T2 (en) 1993-05-19
EP0391757B1 (en) 1993-01-27
DE391757T1 (en) 1991-03-21
DE69000811D1 (en) 1993-03-11

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