EP0606034A1 - Ophtalmic lenses grinding machine - Google Patents

Ophtalmic lenses grinding machine Download PDF

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Publication number
EP0606034A1
EP0606034A1 EP93403193A EP93403193A EP0606034A1 EP 0606034 A1 EP0606034 A1 EP 0606034A1 EP 93403193 A EP93403193 A EP 93403193A EP 93403193 A EP93403193 A EP 93403193A EP 0606034 A1 EP0606034 A1 EP 0606034A1
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EP
European Patent Office
Prior art keywords
rocker
axis
lens
motor
vernier
Prior art date
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
EP93403193A
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German (de)
French (fr)
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EP0606034B1 (en
Inventor
Michel Nauche
Laurent Guillermin
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EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique 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
    • 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
    • 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
    • B24B9/148—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 electrically, e.g. numerically, controlled

Definitions

  • the present invention relates to a machine for grinding ophthalmic lenses, comprising one or more grinding wheels rotatably mounted about an axis and driven by a motor, a rocker pivotally mounted relative to an axis parallel to said axis of the grinding wheels, a vernier, said rocker comprising gripping means for holding and rotating a lens about an axis, said vernier moving substantially along its longitudinal axis as a function of the angular position of said gripping means.
  • the trimming operation is the operation which makes it possible to adapt the outline of an ophthalmic lens, which is generally circular, to the outline of the frame intended to receive it. It therefore consists in removing certain parts of the periphery of the lens.
  • the beveling operation of an ophthalmic lens which is implemented after trimming, makes it possible to adapt the section of the peripheral edge of the lens, so that it can engage in the groove that a mounting frame usually comprises. glasses.
  • the bevelling of a lens therefore consists in providing on the peripheral edge of the lens a rib or bevel, which generally has a triangular shape.
  • the grooving operation of an ophthalmic lens is also implemented after trimming the lens. It allows to adapt the section of the peripheral edge of the lens so that it can be mounted in certain types of frames. Indeed, some frames do not have a groove on the entire inner perimeter of the frame; on the contrary, for example, the frame only corresponds to the upper part of the lens and the lower part of the lens is only retained by a transparent wire. In such a case, it is necessary to provide a groove or groove, most often triangular or semi-circular on the peripheral edge of the lens.
  • These grinding machines generally consist of a chassis which supports on the one hand one or more diamond grinding wheels, often joined to constitute a train of grinding wheels, and mounted rotatably around an axis.
  • the chassis also supports an ophthalmic lens holder rocker.
  • This lever has gripping means capable of receiving, maintaining and rotating the ophthalmic lens to be treated.
  • the rocker and the grinding wheel (s) are capable of moving relative to each other, on the one hand along the direction of the axis of the grinding wheels (axial movement) and, on the other hand part, substantially perpendicular to this axis (orthoradial movement).
  • the relative axial movement makes it possible to pass from one grinding wheel to another and also makes it possible to follow the contours of the lens during the beveling or grooving operation.
  • the substantially orthoradial relative movement makes it possible to machine lenses of non-circular shape.
  • the present invention relates to this substantially orthoradial movement of the rocker relative to the grinding wheels in a grinding machine.
  • the grinding wheel (s) are rotatably mounted around a first axis and the rocker is slidably and pivotally mounted relative to a second axis parallel to the first.
  • the scale is sometimes also mounted movable perpendicular to the axis of the wheel (s).
  • support means urge the rocker towards the axis of the grinding wheels.
  • These support means result from the effect of gravity alone on the scale or from the combined effect of gravity and means such as springs or a counterweight system.
  • the support means which urge the rocker in the direction of the grinding wheel axis are formed by the effect of gravity and by a spring whose tension is adjustable.
  • a template having the shape of the lens to be obtained is mounted at the same time as the lens on the axis of rotation thereof.
  • a vernier is mounted stationary relative to the axis of the grinding wheels and has at its end a key making it possible to determine when the vernier comes into contact with the template.
  • the template is replaced by a disc and the vernier moves substantially along its longitudinal axis depending on the shape of the lens to be obtained.
  • a button located at the end of the vernier allows in the same way to determine when the vernier comes into contact with the disc. In both cases, when the vernier key comes into contact with the template or the disc, in a given angular position of the lens, this means that the machining is finished in this angular position.
  • the lens is supported on one of the grinding wheels, under the action of the support means.
  • the contact of the vernier key on the template or on the disc makes it possible to determine for each angular position of the glass the moment when the machining is finished.
  • the support means cause a constant support load on the glass in the case of a counterweight, and substantially constant in the case of an elastic return by spring. This can, in the case of high power organic glasses, cause too great a force on the grinding wheel and lead to stalling of the motor. Conversely, in the case of very thin glasses, this constant bearing load may prove to be too high and cause the glass to burst.
  • a machining mode consists in choosing a direction of rotation of the lens, and in changing this direction of rotation with each contact of the vernier key on the template or the disc.
  • this type of system is intrinsically limited in its precision by the necessary existence of a stroke of the button arranged at the end of the vernier.
  • the present invention overcomes these drawbacks. It provides a solution to the problems of vibrations, axial play and rebounds due to the support means or the touch of the vernier. It allows the machining to be adapted to the type of glass worked, without adjusting the grinding machine. It ensures faster and more precise machining, without requiring, as in known systems, large counterweights or springs.
  • the invention relates to a lens grinding machine, comprising one or more grinding wheels rotatably mounted around a grinding wheel axis and driven by a motor, a rocker pivotally mounted relative to a rocking axis parallel to said grinding wheel axis, a vernier , said rocker comprising gripping means for holding and rotating a lens about a lens axis, said vernier moving substantially along its longitudinal axis as a function of the angular position of said gripping means. It is characterized by a positive connection between the vernier and said rocker, the displacements of the vernier thus determining the angular position of the rocker relative to the rocker axis.
  • the rocker slides along the rocker axis and the positive link ensures the angular positioning of said rocker during movement along said rocker axis.
  • the positive connection comprises a groove-carrying part having an oblong groove in which engages a disc mounted on the rocker.
  • the disc is preferably mounted on the axis of the gripping means.
  • the disc moves in the groove-carrying part during the sliding movement of the rocker along the rocker axis.
  • the machine further comprises means for evaluating the thickness of the lens, and the movement of the vernier motor is controlled as a function of the information transmitted by said evaluation means.
  • the vernier comprises a rod, connected by one of its ends to the rocker, a ball screw connected to the other end of the rod, and a motor capable of rotating the ball screw.
  • the motor can be mounted on the chassis of the grinding machine by a pivot connection around an axis parallel to the axes of rocker, lens or grinding wheels.
  • the end of the rod can be connected to the scale by a pivot link around a shaft fixed on said scale.
  • FIG. 1 is a schematic representation of a grinding machine of the known type.
  • the machine chassis is not shown.
  • the machine comprises a train of grinding wheels 1, driven in rotation about a grinding wheel axis 2 by a motor 3.
  • the machine furthermore comprises a rocker 4, slidably mounted (arrow 5) and pivoting (arrow 6) relative to a tilt axis 7 parallel to axis 2 of the grinding wheels.
  • This rocker 4 has gripping means 8, 9, consisting of pins capable of holding and rotating a lens 10 around a lens axis 11 parallel to the axes of grinding wheels 2 and rocker 7.
  • a disc 12 is mounted on the lens axis 11 and rotates at the same time as the latter.
  • a vernier 13 having at its end close to the disc 12 a sensitive key 14 is disposed orthogonally to the axis 2 of the grinding wheels, and is capable of moving along its longitudinal axis, under the action of a motor 15. The sensitive key 14 then comes into contact with the disc 12.
  • support means 16 constituted by a return spring urge the rocker 4 so as to bring the lens axis 11 of the lens 10 closer to the axis 2 of the grinding wheels, in the direction of the longitudinal direction of the vernier 13.
  • the support means 16 hold the lens 10 against the grinding wheel 1.
  • the key 14 of the vernier 13 comes into contact of the disc 12.
  • the machining then continues on the other points of the perimeter of the lens, until the key 14 is in contact with the disc 12 at each point of its contour.
  • FIG. 2 shows a schematic representation of a first embodiment of a grinding machine according to the invention.
  • the parts of the machine identical to those of FIG. 1 are referenced by the same numbers and their description is not repeated.
  • the grinding machine of Figure 2 has at the end of the vernier 13, not a sensitive key, but a groove holder part 17.
  • This part 17 has an oblong groove 18 in which the disc 12, mounted on the axis of lens 11, is liable to move.
  • the disc 12 is replaced by a bearing mounted on the axis.
  • the grinding machine of FIG. 2 does not have any support means 16.
  • the machine according to the invention has, thanks to the groove-carrying part 17, a positive connection between the vernier 13 driven by the motor. 15 and the rocker 4. In this way, the angular position of the rocker 4 around the rocker axis 7 is directly controlled by the position of the vernier 13.
  • the movement of the vernier 13 is controlled by a motor 15.
  • This motor is controlled, depending on the angular position of the gripping means 8, 9, and therefore in function of the angular position of the lens during machining.
  • the motor 15 of the vernier 13 is also controlled according to the form of lens to be obtained, which can be read on a frame using an appropriate device, or which can correspond to a template saved in the machine .
  • FIG. 3 shows a schematic representation of a second embodiment of a grinding machine according to the invention. Parts of the machine similar to those in FIG. 2 are referenced by the same numbers and their description is not repeated.
  • the rocker 4 only has a rotational movement around the rocker axis 7, as symbolized by the arrow 6.
  • the assembly consisting of the train of grinding wheels 1 and the grinding wheel motor 3 is however likely to move along the axis of the grinding wheels 2, as symbolized by the arrow 5 '.
  • the vernier comprises a rod 19 connected at one end to the rocker 4, by a connection pivot around a shaft 20 fixed on the rocker.
  • the other end of the rod 19 is connected to a ball screw 21.
  • the ball screw is mounted in a motor 22 capable of rotating it.
  • the motor 22 is mounted on the chassis of the grinding machine, by a pivot connection around an axis parallel to the shaft 20, and to axes 7, 11 and 2.
  • the device of FIG. 3 operates substantially like that of FIG. 2.
  • the motor 22 is controlled like the motor 15, depending on the shape of the lens to be obtained.
  • the rotation of the ball screw 21 under the action of the motor 22 leads to a variation in the length of the vernier formed by the rod 19, the screw 21 and the motor 22.
  • the distance separating the pivot link connecting the rod to the rocker and the pivot link connecting the motor 22 to the chassis varies according to the shape of the lens to be obtained, which controls the position of the rocker 4 in its rotation around the rocker axis 7.
  • the invention thus makes it possible to eliminate all the games around the rocker axis 7, as well as rebounds, vibrations and other phenomena harmful to the machining of glass.
  • the invention allows an adjustment of the force with which the lens 10 rests on the grinding wheel 1, by controlling the respective torques of the motors 3 and 15 or 22.
  • the invention makes it possible to vary the force with which the lens rests on the grinding wheel, depending on the machining phases.
  • the load can be much greater than in known systems, without requiring a counterweight or spring.
  • the bearing force can vary depending on the phases of the machining.
  • the invention prevents any stalling of the motor of the grinding wheels, and faster machining is obtained.
  • the variation of the bearing load is advantageously modulated as a function of the thickness of the lens.
  • a device for measuring the thickness of the lens in its peripheral part is described in the aforementioned patent of the applicant.
  • This device consists of a reading station comprising two sensors forming sensors and which are applied to the faces of the lens to be machined.
  • the motor 15 or 22, which controls the position of the vernier 13 is controlled by also taking into account the information transmitted by the two probes.
  • the position of the rocker takes into account the thickness of the glass, and it is possible to load more thick glass, and to load little thin glass.
  • the lens finishing step be it bevelling or grooving, it is possible to vary the pressure of the lens on the grinding wheel according to the force to be obtained. For example, it is possible to increase the pressure and reduce the speed of rotation of the lens on the flat parts of the periphery of the lens. You can also reduce the pressure and increase the speed of rotation of the glass for angles; these controls allow a much more precise machining of the shape of the lens.
  • These controls are easily obtained according to the invention by controlling the motor 15 or 22 which determines the position of the vernier 13, and therefore via the positive link, the position of the rocker 4.
  • the diagrams of Figures 2 and 3 show only possible embodiments of the invention, which are capable of being easily adapted on existing grinding machines. It is of course possible to provide other forms for the invention.
  • the disc or bearing 12 is not necessarily integral with the axis 11 of the lens 10, and may very well be carried by an axis offset with respect to the lens axis 11, as in the embodiment in Figure 3.
  • the part 17 does not have to have an oblong groove.
  • the oblong groove allows rotation of the rocker 4 while the vernier remains parallel to itself.
  • the thickness of the part 17 allows the axial movement of the lever without risk of loss of the positive connection between the vernier 13 and the lever 4. In the embodiment of FIG. 3, these characteristics are replaced by a tilting movement of the entire vernier 13.

Abstract

The subject of the invention is a machine for grinding ophthalmic lenses, comprising one or more grinding wheels 1 mounted so that they can rotate about an axis 2 and which are driven by a motor 3, a rocker 4 mounted so that it can pivot with respect to an axis 7 parallel to the said axis 2 of the grinding wheels, and a vernier scale 13. The rocker comprises gripping means 8, 9 for holding and rotating a lens 10 about an axis 11 and the vernier scale 13 moves substantially along its longitudinal axis depending on the angular position of the gripping means 8, 9. According to the invention, a positive link is provided between the vernier scale 13 and the said rocker, the displacements of the vernier scale 13 thus determining the angular position of the rocker 4 with respect to the axis 7. <IMAGE>

Description

La présente invention concerne une machine à meuler des lentilles ophtalmiques, comprenant une ou plusieurs meules montées rotatives autour d'un axe et entraînées par un moteur, une bascule montée pivotante par rapport à un axe parallèle audit axe des meules, un vernier, ladite bascule comprenant des moyens de préhension pour maintenir et faire tourner une lentille autour d'un axe, ledit vernier se déplaçant sensiblement selon son axe longitudinal en fonction de la position angulaire desdits moyens de préhension.The present invention relates to a machine for grinding ophthalmic lenses, comprising one or more grinding wheels rotatably mounted about an axis and driven by a motor, a rocker pivotally mounted relative to an axis parallel to said axis of the grinding wheels, a vernier, said rocker comprising gripping means for holding and rotating a lens about an axis, said vernier moving substantially along its longitudinal axis as a function of the angular position of said gripping means.

Il existe déjà des machines à meuler, utilisées dans le domaine ophtalmique pour détourer, biseauter ou rainurer des lentilles ophtalmiques.There are already grinding machines, used in the ophthalmic field to cut, bevel or groove ophthalmic lenses.

L'opération de détourage est l'opération qui permet d'adapter le contour d'une lentille ophtalmique, qui est généralement circulaire, au contour de la monture destinée à la recevoir. Elle consiste donc à supprimer certaines parties de la périphérie de la lentille.The trimming operation is the operation which makes it possible to adapt the outline of an ophthalmic lens, which is generally circular, to the outline of the frame intended to receive it. It therefore consists in removing certain parts of the periphery of the lens.

L'opération de biseautage d'une lentille ophtalmique, qui est mise en oeuvre après le détourage, permet d'adapter la section du bord périphérique de la lentille, pour qu'elle puisse s'engager dans la rainure que comporte habituellement une monture de lunettes. Le biseautage d'une lentille consiste donc à ménager sur le bord périphérique de la lentille une nervure ou un biseau, qui présente en général une forme triangulaire.The beveling operation of an ophthalmic lens, which is implemented after trimming, makes it possible to adapt the section of the peripheral edge of the lens, so that it can engage in the groove that a mounting frame usually comprises. glasses. The bevelling of a lens therefore consists in providing on the peripheral edge of the lens a rib or bevel, which generally has a triangular shape.

L'opération de rainurage d'une lentille ophtalmique est aussi mise en oeuvre après le détourage de la lentille. Elle permet d'adapter la section du bord périphérique de la lentille pour que celle-ci puisse être montée dans certains types de montures. En effet, certaines montures ne présentent pas une rainure sur tout le périmètre intérieur de la monture; il arrive au contraire par exemple que la monture ne corresponde qu'à la partie supérieure de la lentille et que la partie inférieure de la lentille ne soit retenue que par un fil transparent. Dans un tel cas, il est nécessaire de ménager une rainure ou gorge, le plus souvent triangulaire ou semi-circulaire sur le bord périphérique de la lentille.The grooving operation of an ophthalmic lens is also implemented after trimming the lens. It allows to adapt the section of the peripheral edge of the lens so that it can be mounted in certain types of frames. Indeed, some frames do not have a groove on the entire inner perimeter of the frame; on the contrary, for example, the frame only corresponds to the upper part of the lens and the lower part of the lens is only retained by a transparent wire. In such a case, it is necessary to provide a groove or groove, most often triangular or semi-circular on the peripheral edge of the lens.

Le plus souvent, ces trois opérations sont conduites sur une même machine à meuler qui est équipée d'un train de meules. De telles machines sont connues et disponibles dans le commerce. Un exemple en est donné dans le brevet français publié sous le numéro 2 543 039, au nom de la demanderesse.Most often, these three operations are carried out on the same grinding machine which is equipped with a train of grinding wheels. Such machines are known and commercially available. An example is given in the French patent published under the number 2,543,039, in the name of the applicant.

Ces machines à meuler sont généralement constituées d'un châssis qui supporte d'une part une ou plusieurs meules diamantées, souvent accolées pour constituer un train de meules, et montées rotatives autour d'un axe. Le châssis supporte d'autre part une bascule porte-lentille ophtalmique. Cette bascule présente des moyens de préhension susceptibles de recevoir, maintenir et faire tourner la lentille ophtalmique à traiter. Dans une telle machine à meuler, la bascule et la ou les meules sont susceptibles de se déplacer l'une relativement à l'autre, d'une part suivant la direction de l'axe des meules (mouvement axial) et, d'autre part, sensiblement perpendiculairement à cet axe (mouvement orthoradial). Le mouvement relatif axial permet de passer d'une meule à une autre et permet aussi de suivre les contours de la lentille lors de l'opération de biseautage ou de rainurage. Le mouvement relatif sensiblement orthoradial permet d'usiner des lentilles de forme non circulaire. La présente invention concerne ce mouvement sensiblement orthoradial de la bascule par rapport aux meules dans une machine à meuler.These grinding machines generally consist of a chassis which supports on the one hand one or more diamond grinding wheels, often joined to constitute a train of grinding wheels, and mounted rotatably around an axis. The chassis also supports an ophthalmic lens holder rocker. This lever has gripping means capable of receiving, maintaining and rotating the ophthalmic lens to be treated. In such a grinding machine, the rocker and the grinding wheel (s) are capable of moving relative to each other, on the one hand along the direction of the axis of the grinding wheels (axial movement) and, on the other hand part, substantially perpendicular to this axis (orthoradial movement). The relative axial movement makes it possible to pass from one grinding wheel to another and also makes it possible to follow the contours of the lens during the beveling or grooving operation. The substantially orthoradial relative movement makes it possible to machine lenses of non-circular shape. The present invention relates to this substantially orthoradial movement of the rocker relative to the grinding wheels in a grinding machine.

Le plus souvent, la ou les meules sont montées rotatives autour d'un premier axe et la bascule est montée coulissante et pivotante par rapport à un deuxième axe parallèle au premier. La bascule est parfois aussi montée mobile perpendiculairement à l'axe de la ou des meules.Most often, the grinding wheel (s) are rotatably mounted around a first axis and the rocker is slidably and pivotally mounted relative to a second axis parallel to the first. The scale is sometimes also mounted movable perpendicular to the axis of the wheel (s).

Dans les machines connues, des moyens d'appui sollicitent la bascule en direction de l'axe des meules. Ces moyens d'appui résultent de l'effet de la seule gravité sur la bascule ou de l'effet combiné de la gravité et de moyens tels que des ressorts ou un système de contrepoids. Ainsi, dans le brevet de la demanderesse cité plus haut, les moyens d'appui qui sollicitent la bascule en direction de l'axe des meules sont constitués par l'effet de la gravité et par un ressort dont la tension est réglable.In known machines, support means urge the rocker towards the axis of the grinding wheels. These support means result from the effect of gravity alone on the scale or from the combined effect of gravity and means such as springs or a counterweight system. Thus, in the applicant's patent cited above, the support means which urge the rocker in the direction of the grinding wheel axis are formed by the effect of gravity and by a spring whose tension is adjustable.

Dans les machines classiques, un gabarit présentant la forme de lentille à obtenir est monté en même temps que la lentille sur l'axe de rotation de celle-ci. Un vernier est monté immobile par rapport à l'axe des meules et comporte à son extrémité une touche permettant de déterminer quand le vernier vient au contact du gabarit. Dans les machines plus modernes, le gabarit est remplacé par un disque et le vernier se déplace sensiblement selon son axe longitudinal en fonction de la forme de lentille à obtenir. Une touche disposée à l'extrémité du vernier permet de la même façon de déterminer quand le vernier vient au contact du disque. Dans les deux cas, lorsque la touche du vernier vient au contact du gabarit ou du disque, dans une position angulaire donnée de la lentille, cela signifie que l'usinage est terminé dans cette position angulaire.In conventional machines, a template having the shape of the lens to be obtained is mounted at the same time as the lens on the axis of rotation thereof. A vernier is mounted stationary relative to the axis of the grinding wheels and has at its end a key making it possible to determine when the vernier comes into contact with the template. In more modern machines, the template is replaced by a disc and the vernier moves substantially along its longitudinal axis depending on the shape of the lens to be obtained. A button located at the end of the vernier allows in the same way to determine when the vernier comes into contact with the disc. In both cases, when the vernier key comes into contact with the template or the disc, in a given angular position of the lens, this means that the machining is finished in this angular position.

Ainsi, pendant tout l'usinage, c'est-à-dire pendant le détourage, le biseautage ou le rainurage, la lentille est en appui sur une des meules, sous l'action des moyens d'appui. Le contact de la touche du vernier sur le gabarit ou sur le disque permet de déterminer pour chaque position angulaire du verre le moment où l'usinage est terminé.Thus, during all of the machining, that is to say during trimming, beveling or grooving, the lens is supported on one of the grinding wheels, under the action of the support means. The contact of the vernier key on the template or on the disc makes it possible to determine for each angular position of the glass the moment when the machining is finished.

Ce système de l'art antérieur présente des inconvénients. Tout d'abord, la bascule est simplement en appui sur la meule en cours d'utilisation, sous l'action des moyens d'appui. De ce fait, il existe pour la bascule un risque de vibrations non maîtrisables que les moyens d'appui constitués par la gravité ou une force de rappel élastique ou de contrepoids ne permettent pas d'éliminer.This system of the prior art has drawbacks. First of all, the lever is simply supported on the grinding wheel in use, under the action of the support means. As a result, there is a risk of the rocker that cannot be controlled which the support means constituted by gravity or an elastic return force or counterweight do not make it possible to eliminate.

De plus, les moyens d'appui entraînent sur le verre une charge d'appui constante dans le cas d'un contrepoids, et sensiblement constante dans le cas d'un rappel élastique par ressort. Ceci peut, dans le cas de verres organiques de forte puissance, entraîner une force trop importante sur la meule et conduire au calage du moteur. Inversement, dans le cas de verres très fins, cette charge d'appui constante peut s'avérer trop importante et provoquer l'éclatement du verre.In addition, the support means cause a constant support load on the glass in the case of a counterweight, and substantially constant in the case of an elastic return by spring. This can, in the case of high power organic glasses, cause too great a force on the grinding wheel and lead to stalling of the motor. Conversely, in the case of very thin glasses, this constant bearing load may prove to be too high and cause the glass to burst.

En outre, les systèmes connus imposent des cycles d'usinage compliqués et peu rationnels. Ainsi, un mode d'usinage consiste à choisir un sens de rotation de la lentille, et à changer ce sens de rotation à chaque contact de la touche du vernier sur le gabarit ou le disque.In addition, the known systems impose complicated and not very rational machining cycles. Thus, a machining mode consists in choosing a direction of rotation of the lens, and in changing this direction of rotation with each contact of the vernier key on the template or the disc.

Enfin, de par sa constitution même, ce type de système est intrinsèquement limité dans sa précision par l'existence nécessaire d'une course de la touche disposée à l'extrémité du vernier.Finally, by its very constitution, this type of system is intrinsically limited in its precision by the necessary existence of a stroke of the button arranged at the end of the vernier.

La présente invention permet de pallier ces inconvénients. Elle fournit une solution aux problèmes de vibrations, de jeux axiaux et de rebonds dus aux moyens d'appui ou à la touche du vernier. Elle permet d'adapter l'usinage au type de verre travaillé, sans réglage de la machine à meuler. Elle assure un usinage plus rapide et plus précis, sans nécessiter, comme dans les systèmes connus, de contrepoids ou ressorts importants.The present invention overcomes these drawbacks. It provides a solution to the problems of vibrations, axial play and rebounds due to the support means or the touch of the vernier. It allows the machining to be adapted to the type of glass worked, without adjusting the grinding machine. It ensures faster and more precise machining, without requiring, as in known systems, large counterweights or springs.

L'invention concerne une machine à meuler les lentilles, comprenant une ou plusieurs meules montées rotatives autour d'un axe de meules et entraînées par un moteur, une bascule montée pivotante par rapport à un axe de bascule parallèle audit axe de meules, un vernier, ladite bascule comprenant des moyens de préhension pour maintenir et faire tourner une lentille autour d'un axe de lentille, ledit vernier se déplaçant sensiblement selon son axe longitudinal en fonction de la position angulaire desdits moyens de préhension. Elle est caractérisée par une liaison positive entre le vernier et ladite bascule, les déplacements du vernier déterminant ainsi la position angulaire de la bascule par rapport à l'axe de bascule.The invention relates to a lens grinding machine, comprising one or more grinding wheels rotatably mounted around a grinding wheel axis and driven by a motor, a rocker pivotally mounted relative to a rocking axis parallel to said grinding wheel axis, a vernier , said rocker comprising gripping means for holding and rotating a lens about a lens axis, said vernier moving substantially along its longitudinal axis as a function of the angular position of said gripping means. It is characterized by a positive connection between the vernier and said rocker, the displacements of the vernier thus determining the angular position of the rocker relative to the rocker axis.

Selon un mode de réalisation de l'invention, la bascule coulisse le long de l'axe de bascule et la liaison positive assure le positionnement angulaire de ladite bascule au cours du mouvement le long dudit axe de bascule.According to one embodiment of the invention, the rocker slides along the rocker axis and the positive link ensures the angular positioning of said rocker during movement along said rocker axis.

Avantageusement, la liaison positive comporte une pièce porte-rainure présentant une rainure oblongue dans laquelle s'engage un disque monté sur la bascule.Advantageously, the positive connection comprises a groove-carrying part having an oblong groove in which engages a disc mounted on the rocker.

Dans ce cas, le disque est monté de préférence sur l'axe des moyens de préhension.In this case, the disc is preferably mounted on the axis of the gripping means.

Le disque se déplace dans la pièce porte-rainure au cours du mouvement de coulissement de la bascule le long de l'axe de bascule.The disc moves in the groove-carrying part during the sliding movement of the rocker along the rocker axis.

Selon encore un mode de réalisation de l'invention, la machine comprend en outre des moyens d'évaluation de l'épaisseur de la lentille, et le mouvement du moteur du vernier est asservi en fonction des informations transmises par lesdits moyens d'évaluation.According to yet another embodiment of the invention, the machine further comprises means for evaluating the thickness of the lens, and the movement of the vernier motor is controlled as a function of the information transmitted by said evaluation means.

Dans un mode de réalisation de la machine selon l'invention, le vernier comprend une tige, reliée par une de ses extrémités à la bascule, une vis à bille reliée à l'autre extrémité de la tige, et un moteur susceptible de faire tourner la vis à bille.In one embodiment of the machine according to the invention, the vernier comprises a rod, connected by one of its ends to the rocker, a ball screw connected to the other end of the rod, and a motor capable of rotating the ball screw.

Dans ce cas, le moteur peut être monté sur le châssis de la machine à meuler par une liaison pivot autour d'un axe parallèle aux axes de bascule, de lentille ou de meules.In this case, the motor can be mounted on the chassis of the grinding machine by a pivot connection around an axis parallel to the axes of rocker, lens or grinding wheels.

L'extrémité de la tige peut être reliée à la bascule par une liaison pivot autour d'un arbre fixé sur ladite bascule.The end of the rod can be connected to the scale by a pivot link around a shaft fixed on said scale.

On peut aussi choisir d'asservir le mouvement du moteur en fonction de la position angulaire des moyens de préhension et de la forme à donner à la lentille.One can also choose to control the movement of the motor according to the angular position of the gripping means and the shape to be given to the lens.

Il est aussi possible d'asservir le couple du moteur du vernier en fonction du couple du moteur entraînant les meules.It is also possible to control the torque of the vernier motor depending on the torque of the motor driving the grinding wheels.

D'autres buts, avantages et caractéristiques apparaîtront à la lecture de la description d'un mode de réalisation de l'invention, faite à titre non limitatif et en regard du dessin annexé, dans lequel:

  • la figure 1 est une représentation schématique d'une machine à meuler de type connu;
  • la figure 2 est une représentation schématique d'un premier mode de réalisation d'une machine à meuler selon l'invention.
  • la figure 3 est une représentation schématique d'un deuxième mode de réalisation d'une machine à meuler selon l'invention.
Other objects, advantages and characteristics will appear on reading the description of an embodiment of the invention, given without limitation and with reference to the appended drawing, in which:
  • Figure 1 is a schematic representation of a grinding machine of known type;
  • Figure 2 is a schematic representation of a first embodiment of a grinding machine according to the invention.
  • Figure 3 is a schematic representation of a second embodiment of a grinding machine according to the invention.

La figure 1 est une représentation schématique d'une machine à meuler du type connu. Le châssis de la machine n'est pas représenté. La machine comporte un train de meules 1, entraîné en rotation autour d'un axe de meules 2 par un moteur 3. La machine comporte par ailleurs une bascule 4, montée coulissante (flèche 5) et pivotante (flèche 6) par rapport à un axe de bascule 7 parallèle à l'axe 2 des meules. Cette bascule 4 présente des moyens de préhension 8, 9, constitués de broches susceptibles de maintenir et faire tourner une lentille 10 autour d'un axe de lentille 11 parallèle aux axes de meules 2 et de bascule 7. Un disque 12 est monté sur l'axe de lentille 11 et tourne en même temps que celle-ci. Un vernier 13 présentant à son extrémité voisine du disque 12 une touche sensible 14 est disposé orthogonalement à l'axe 2 des meules, et est susceptible de se déplacer suivant son axe longitudinal, sous l'action d'un moteur 15. La touche sensible 14 vient alors au contact du disque 12. Enfin, des moyens d'appui 16 constitués par un ressort de rappel sollicitent la bascule 4 de sorte à rapprocher l'axe de lentille 11 de la lentille 10 de l'axe 2 des meules, dans le sens de la direction longitudinale du vernier 13.Figure 1 is a schematic representation of a grinding machine of the known type. The machine chassis is not shown. The machine comprises a train of grinding wheels 1, driven in rotation about a grinding wheel axis 2 by a motor 3. The machine furthermore comprises a rocker 4, slidably mounted (arrow 5) and pivoting (arrow 6) relative to a tilt axis 7 parallel to axis 2 of the grinding wheels. This rocker 4 has gripping means 8, 9, consisting of pins capable of holding and rotating a lens 10 around a lens axis 11 parallel to the axes of grinding wheels 2 and rocker 7. A disc 12 is mounted on the lens axis 11 and rotates at the same time as the latter. A vernier 13 having at its end close to the disc 12 a sensitive key 14 is disposed orthogonally to the axis 2 of the grinding wheels, and is capable of moving along its longitudinal axis, under the action of a motor 15. The sensitive key 14 then comes into contact with the disc 12. Finally, support means 16 constituted by a return spring urge the rocker 4 so as to bring the lens axis 11 of the lens 10 closer to the axis 2 of the grinding wheels, in the direction of the longitudinal direction of the vernier 13.

Lors de l'usinage de la lentille, les moyens d'appui 16 maintiennent la lentille 10 contre la meule 1. Lorsque, dans une direction angulaire donnée, l'usinage de la lentille est achevé, la touche 14 du vernier 13 vient au contact du disque 12. L'usinage continue alors sur les autres points du périmètre de la lentille, jusqu'à ce que la touche 14 soit au contact du disque 12 en chaque point de son contour.During the machining of the lens, the support means 16 hold the lens 10 against the grinding wheel 1. When, in a given angular direction, the machining of the lens is completed, the key 14 of the vernier 13 comes into contact of the disc 12. The machining then continues on the other points of the perimeter of the lens, until the key 14 is in contact with the disc 12 at each point of its contour.

Le système représenté à la figure 1 présente les inconvénients décrits ci-dessus.The system shown in Figure 1 has the disadvantages described above.

La figure 2 montre une représentation schématique d'un premier mode de réalisation d'une machine à meuler selon l'invention. Les parties de la machine identiques à celles de la figure 1 sont référencées par les mêmes numéros et leur description n'est pas reprise. La machine à meuler de la figure 2 présente à l'extrémité du vernier 13, non pas une touche sensible, mais une pièce porte-rainure 17. Cette pièce 17 présente une rainure 18 oblongue dans laquelle le disque 12, monté sur l'axe de lentille 11, est susceptible de se déplacer. Avantageusement, le disque 12 est remplacé par un roulement monté sur l'axe. La machine à meuler de la figure 2 ne présente pas de moyens d'appui 16. De ce fait, la machine selon l'invention présente, grâce à la pièce porte-rainure 17, une liaison positive entre le vernier 13 entraîné par le moteur 15 et la bascule 4. De la sorte, la position angulaire de la bascule 4 autour de l'axe de bascule 7 est contrôlée directement par la position du vernier 13.Figure 2 shows a schematic representation of a first embodiment of a grinding machine according to the invention. The parts of the machine identical to those of FIG. 1 are referenced by the same numbers and their description is not repeated. The grinding machine of Figure 2 has at the end of the vernier 13, not a sensitive key, but a groove holder part 17. This part 17 has an oblong groove 18 in which the disc 12, mounted on the axis of lens 11, is liable to move. Advantageously, the disc 12 is replaced by a bearing mounted on the axis. The grinding machine of FIG. 2 does not have any support means 16. As a result, the machine according to the invention has, thanks to the groove-carrying part 17, a positive connection between the vernier 13 driven by the motor. 15 and the rocker 4. In this way, the angular position of the rocker 4 around the rocker axis 7 is directly controlled by the position of the vernier 13.

Dans une machine selon l'invention, telle que celle de la figure 2, le mouvement du vernier 13 est commandé par un moteur 15. Ce moteur est asservi, en fonction de la position angulaire des moyens de préhension 8, 9, et donc en fonction de la position angulaire de la lentille en cours d'usinage. Bien entendu, le moteur 15 du vernier 13 est aussi asservi en fonction de la forme de lentille à obtenir, qui peut être lue sur une monture à l'aide d'un appareil approprié, ou qui peut correspondre à un gabarit enregistré dans la machine.In a machine according to the invention, such as that of FIG. 2, the movement of the vernier 13 is controlled by a motor 15. This motor is controlled, depending on the angular position of the gripping means 8, 9, and therefore in function of the angular position of the lens during machining. Of course, the motor 15 of the vernier 13 is also controlled according to the form of lens to be obtained, which can be read on a frame using an appropriate device, or which can correspond to a template saved in the machine .

La figure 3 montre une représentation schématique d'un deuxième mode de réalisation d'une machine à meuler selon l'invention. Les parties de la machine analogues à celles de la figure 2 sont référencées par les mêmes numéros et leur description n'est pas reprise. Dans la machine de la figure 3, la bascule 4 n'a qu'un mouvement de rotation autour de l'axe de bascule 7, comme le symbolise la flèche 6. L'ensemble constitué du train de meules 1 et du moteur de meules 3 est en revanche susceptible de se déplacer le long de l'axe des meules 2, comme le symbolise la flèche 5'. Dans le mode de réalisation de la figure 3, le vernier comprend une tige 19 reliée à une extrémité à la bascule 4, par une liaison pivot autour d'un arbre 20 fixé sur la bascule. L'autre extrémité de la tige 19 est reliée à une vis à bille 21. La vis à bille est montée dans un moteur 22 susceptible de la faire tourner. Le moteur 22 est monté sur le châssis de la machine à meuler, par une liaison pivot autour d'un axe parallèle à l'arbre 20, et aux axes 7, 11 et 2.Figure 3 shows a schematic representation of a second embodiment of a grinding machine according to the invention. Parts of the machine similar to those in FIG. 2 are referenced by the same numbers and their description is not repeated. In the machine of FIG. 3, the rocker 4 only has a rotational movement around the rocker axis 7, as symbolized by the arrow 6. The assembly consisting of the train of grinding wheels 1 and the grinding wheel motor 3 is however likely to move along the axis of the grinding wheels 2, as symbolized by the arrow 5 '. In the embodiment of Figure 3, the vernier comprises a rod 19 connected at one end to the rocker 4, by a connection pivot around a shaft 20 fixed on the rocker. The other end of the rod 19 is connected to a ball screw 21. The ball screw is mounted in a motor 22 capable of rotating it. The motor 22 is mounted on the chassis of the grinding machine, by a pivot connection around an axis parallel to the shaft 20, and to axes 7, 11 and 2.

Le dispositif de la figure 3 fonctionne sensiblement comme celui de la figure 2. Le moteur 22 est asservi comme le moteur 15, en fonction de la forme de la lentille à obtenir. La rotation de la vis à bille 21 sous l'action du moteur 22 conduit à une variation de la longueur du vernier constitué par la tige 19, la vis 21 et le moteur 22. De la sorte, la distance séparant la liaison pivot reliant la tige à la bascule et la liaison pivot reliant le moteur 22 au châssis varie en fonction de la forme de la lentille à obtenir, ce qui commande la position de la bascule 4 dans sa rotation autour de l'axe de bascule 7.The device of FIG. 3 operates substantially like that of FIG. 2. The motor 22 is controlled like the motor 15, depending on the shape of the lens to be obtained. The rotation of the ball screw 21 under the action of the motor 22 leads to a variation in the length of the vernier formed by the rod 19, the screw 21 and the motor 22. In this way, the distance separating the pivot link connecting the rod to the rocker and the pivot link connecting the motor 22 to the chassis varies according to the shape of the lens to be obtained, which controls the position of the rocker 4 in its rotation around the rocker axis 7.

L'invention permet ainsi de supprimer tous les jeux autour de l'axe de bascule 7, ainsi que les rebonds, vibrations et autres phénomènes nuisibles à l'usinage du verre. De plus, l'invention permet un réglage de la force avec laquelle la lentille 10 s'appuie sur la meule 1, en contrôlant les couples respectifs des moteurs 3 et 15 ou 22. De la sorte, l'invention permet de varier la force avec laquelle la lentille s'appuie sur la meule, en fonction des phases d'usinage. La charge peut être beaucoup plus importante que dans les systèmes connus, sans nécessiter de contrepoids ou de ressort. La force d'appui peut varier selon les phases de l'usinage. Ainsi, il est possible de fortement charger la lentille lors du détourage, ce qui diminue le temps d'usinage et ne présente pas de risque quant à la précision finale de la lentille. Si l'on désire moduler la force avec laquelle la lentille s'appuie sur la meule, il est possible d'asservir le couple du moteur 15 ou 22 du vernier, en fonction du couple du moteur 3 d'entraînement des meules. De la sorte, on évite grâce à l'invention tout calage du moteur des meules, et on obtient un usinage plus rapide.The invention thus makes it possible to eliminate all the games around the rocker axis 7, as well as rebounds, vibrations and other phenomena harmful to the machining of glass. In addition, the invention allows an adjustment of the force with which the lens 10 rests on the grinding wheel 1, by controlling the respective torques of the motors 3 and 15 or 22. In this way, the invention makes it possible to vary the force with which the lens rests on the grinding wheel, depending on the machining phases. The load can be much greater than in known systems, without requiring a counterweight or spring. The bearing force can vary depending on the phases of the machining. Thus, it is possible to strongly load the lens during trimming, which reduces the machining time and poses no risk as to the final precision of the lens. If one wishes to modulate the force with which the lens rests on the grinding wheel, it is possible to control the torque of the motor 15 or 22 of the vernier, depending on the torque of the motor 3 for driving the grinding wheels. In this way, the invention prevents any stalling of the motor of the grinding wheels, and faster machining is obtained.

La variation de la charge d'appui est avantageusement modulée en fonction de l'épaisseur de la lentille. Un dispositif permettant de mesurer l'épaisseur de la lentille dans sa partie périphérique est décrit dans le brevet précité de la demanderesse. Ce dispositif est constitué d'un poste de lecture comprenant deux palpeurs formant capteurs et qui s'appliquent sur les faces de la lentille à usiner. Dans le cas d'un verre fin, il est alors possible selon l'invention de soulager la sollicitation de la bascule, ce qui limite le risque de casse de la lentille. Le moteur 15 ou 22, qui commande la position du vernier 13 est asservi en tenant aussi compte des informations transmises par les deux palpeurs. Ainsi, la position de la bascule tient compte de l'épaisseur du verre, et il est possible de charger davantage un verre épais, et de peu charger un verre fin.The variation of the bearing load is advantageously modulated as a function of the thickness of the lens. A device for measuring the thickness of the lens in its peripheral part is described in the aforementioned patent of the applicant. This device consists of a reading station comprising two sensors forming sensors and which are applied to the faces of the lens to be machined. In the case of a thin glass, it is then possible according to the invention to relieve the stress of the rocker, which limits the risk of breakage of the lens. The motor 15 or 22, which controls the position of the vernier 13 is controlled by also taking into account the information transmitted by the two probes. Thus, the position of the rocker takes into account the thickness of the glass, and it is possible to load more thick glass, and to load little thin glass.

Dans l'étape de finition de la lentille, que ce soit un biseautage ou un rainurage, il est possible de faire varier la pression de la lentille sur la meule en fonction de la force à obtenir. Par exemple, il est possible d'augmenter la pression et de réduire la vitesse de rotation de la lentille sur les parties planes de la périphérie de la lentille. On peut aussi réduire la pression et augmenter la vitesse de rotation du verre pour les angles; ces asservissements permettent un usinage beaucoup plus précis de la forme de la lentille. Ces asservissements sont facilement obtenus selon l'invention par un contrôle du moteur 15 ou 22 qui détermine la position du vernier 13, et donc par l'intermédiaire de la liaison positive, la position de la bascule 4.In the lens finishing step, be it bevelling or grooving, it is possible to vary the pressure of the lens on the grinding wheel according to the force to be obtained. For example, it is possible to increase the pressure and reduce the speed of rotation of the lens on the flat parts of the periphery of the lens. You can also reduce the pressure and increase the speed of rotation of the glass for angles; these controls allow a much more precise machining of the shape of the lens. These controls are easily obtained according to the invention by controlling the motor 15 or 22 which determines the position of the vernier 13, and therefore via the positive link, the position of the rocker 4.

Les schémas des figures 2 et 3 ne montrent que des modes de réalisation possibles de l'invention, qui sont susceptibles d'être adaptés facilement sur les machines à meuler existantes. Il est bien sûr possible de prévoir d'autres formes pour l'invention. En particulier, le disque ou roulement 12 n'est pas nécessairement solidaire de l'axe 11 de la lentille 10, et peut fort bien être porté par un axe décalé par rapport à l'axe de lentille 11, comme dans le mode de réalisation de la figure 3. Dans le cas d'une machine dans laquelle la bascule est constituée d'une potence, il n'est pas nécessaire que la pièce 17 présente une rainure de forme oblongue. Dans l'exemple de la figure 2, la rainure oblongue permet une rotation de la bascule 4 alors que le vernier reste parallèle à lui-même. De plus, l'épaisseur de la pièce 17 permet le mouvement axial de la bascule sans risque de perte de la liaison positive entre le vernier 13 et la bascule 4. Dans le mode de réalisation de la figure 3, ces caractéristiques sont remplacées par un mouvement de basculement de l'ensemble du vernier 13.The diagrams of Figures 2 and 3 show only possible embodiments of the invention, which are capable of being easily adapted on existing grinding machines. It is of course possible to provide other forms for the invention. In particular, the disc or bearing 12 is not necessarily integral with the axis 11 of the lens 10, and may very well be carried by an axis offset with respect to the lens axis 11, as in the embodiment in Figure 3. In the case of a machine in which the scale consists of a bracket, it is not the part 17 does not have to have an oblong groove. In the example of Figure 2, the oblong groove allows rotation of the rocker 4 while the vernier remains parallel to itself. In addition, the thickness of the part 17 allows the axial movement of the lever without risk of loss of the positive connection between the vernier 13 and the lever 4. In the embodiment of FIG. 3, these characteristics are replaced by a tilting movement of the entire vernier 13.

Bien entendu, la présente invention n'est pas limitée aux modes de réalisation décrits et représentés mais elle est susceptible de nombreuses variantes accessibles à l'homme de l'art sans que l'on ne s'écarte de l'esprit de l'invention.Of course, the present invention is not limited to the embodiments described and shown but it is capable of numerous variants accessible to those skilled in the art without departing from the spirit of the invention.

Claims (13)

Machine à meuler les lentilles ophtalmiques, comprenant une ou plusieurs meules (1) montées rotatives autour d'un axe de meules (2) et entraînées par un moteur (3), une bascule (4) montée pivotante par rapport à un axe de bascule (7) parallèle audit axe (2) des meules, un vernier (13), ladite bascule comprenant des moyens de préhension (8, 9) pour maintenir et faire tourner une lentille (10) autour d'un axe de lentille (11), ledit vernier (13) se déplaçant sensiblement selon son axe longitudinal en fonction de la position angulaire desdits moyens de préhension (8, 9), caractérisée par une liaison positive entre le vernier (13) et ladite bascule, les déplacements du vernier (13) déterminant ainsi la position angulaire de la bascule (4) par rapport à l'axe de bascule (7).Ophthalmic lens grinding machine, comprising one or more grinding wheels (1) rotatably mounted around a grinding wheel axis (2) and driven by a motor (3), a rocker (4) pivotally mounted relative to a rocker axis (7) parallel to said axis (2) of the grinding wheels, a vernier (13), said rocker comprising gripping means (8, 9) for holding and rotating a lens (10) around a lens axis (11) , said vernier (13) moving substantially along its longitudinal axis as a function of the angular position of said gripping means (8, 9), characterized by a positive connection between the vernier (13) and said rocker, the displacements of the vernier (13 ) thus determining the angular position of the rocker (4) relative to the rocker axis (7). Machine selon la revendication 1, caractérisée en ce que la bascule (4) coulisse le long de l'axe (7), et en ce que ladite liaison positive assure le positionnement angulaire de ladite bascule au cours du mouvement le long dudit axe (7).Machine according to claim 1, characterized in that the rocker (4) slides along the axis (7), and in that said positive connection ensures the angular positioning of said rocker during movement along said axis (7 ). Machine selon la revendication 1 ou 2, caractérisée en ce que ladite liaison positive comporte une pièce porte-rainure (17) présentant une rainure oblongue (18) dans laquelle s'engage un disque (12) monté sur la bascule (4).Machine according to claim 1 or 2, characterized in that said positive connection comprises a groove-carrying part (17) having an oblong groove (18) in which engages a disc (12) mounted on the rocker (4). Machine selon la revendication 3, caractérisée en ce que le disque (12) est monté sur l'axe (11) des moyens de préhension (8, 9).Machine according to claim 3, characterized in that the disc (12) is mounted on the axis (11) of the gripping means (8, 9). Machine selon la revendication 3 ou 4, caractérisée en ce que le disque (12) se déplace dans la pièce porte-rainure (17) au cours du mouvement de coulissement de la bascule (4) le long de l'axe (7).Machine according to claim 3 or 4, characterized in that the disc (12) moves in the groove-holding part (17) during the sliding movement of the rocker (4) along the axis (7). Machine selon l'une des revendications 1 à 5, caractérisée en ce que le mouvement du vernier (13) est commandé par un moteur (15) asservi en fonction de la position angulaire des moyens de préhension (8, 9) et de la forme à donner à la lentille (10).Machine according to one of claims 1 to 5, characterized in that the movement of the vernier (13) is controlled by a motor (15) controlled as a function of the angular position of the gripping means (8, 9) and of the shape to give to the lens (10). Machine selon la revendication 6, caractérisée en ce que le couple du moteur (15) du vernier (13) est asservi en fonction du couple du moteur (3) entraînant les meules (1).Machine according to claim 6, characterized in that the torque of the motor (15) of the vernier (13) is controlled depending on the torque of the motor (3) driving the grinding wheels (1). Machine selon la revendication 6 ou 7, caractérisée en ce qu'elle comprend en outre des moyens d'évaluation de l'épaisseur de la lentille, et en ce que le mouvement du moteur (15) du vernier (13) est asservi en fonction des informations transmises par lesdits moyens d'évaluation.Machine according to claim 6 or 7, characterized in that it further comprises means for evaluating the thickness of the lens, and in that the movement of the motor (15) of the vernier (13) is controlled as a function information transmitted by said means of evaluation. Machine selon la revendication 1, caractérisée en ce que en ce que ledit vernier (13) comprend une tige (19), reliée par une de ses extrémités à la bascule (4), une vis à bille (21) reliée à l'autre extrémité de la tige (19), et un moteur (22) susceptible de faire tourner la vis à bille (21),Machine according to claim 1, characterized in that in that said vernier (13) comprises a rod (19), connected by one of its ends to the rocker (4), a ball screw (21) connected to the other end of the rod (19), and a motor (22) capable of rotating the ball screw (21), Machine selon la revendication 9, caractérisée en ce que en ce que ledit moteur (22) est monté sur le châssis de la machine à meuler, par une liaison pivot autour d'un axe parallèle aux axes (7), (11) et (2).Machine according to Claim 9, characterized in that the said motor (22) is mounted on the chassis of the grinding machine, by a pivot connection around an axis parallel to the axes (7), (11) and ( 2). Machine selon la revendication 9 ou 10, caractérisée en ce que en ce que l'extrémité de la tige (19) est reliée à la bascule (4) par une liaison pivot autour d'un arbre (20) fixé sur ladite bascule.Machine according to claim 9 or 10, characterized in that in that the end of the rod (19) is connected to the rocker (4) by a pivot connection around a shaft (20) fixed on said rocker. Machine selon l'une des revendications 9 à 11, caractérisée en ce que le mouvement du moteur (22) est asservi en fonction de la position angulaire des moyens de préhension (8, 9) et de la forme à donner à la lentille (10).Machine according to one of Claims 9 to 11, characterized in that the movement of the motor (22) is controlled as a function of the angular position of the gripping means (8, 9) and of the shape to be given to the lens (10 ). Machine selon l'une des revendications 9 à 12, caractérisée en ce que le couple du moteur (22) est asservi en fonction du couple du moteur (3) entraînant les meules (1).Machine according to one of claims 9 to 12, characterized in that the torque of the motor (22) is controlled as a function of the torque of the motor (3) driving the grinding wheels (1).
EP93403193A 1993-01-08 1993-12-28 Ophtalmic lenses grinding machine Expired - Lifetime EP0606034B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9300130A FR2700286B1 (en) 1993-01-08 1993-01-08 Machine for grinding ophthalmic lenses.
FR9300130 1993-01-08

Publications (2)

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EP0606034A1 true EP0606034A1 (en) 1994-07-13
EP0606034B1 EP0606034B1 (en) 1997-06-18

Family

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EP93403193A Expired - Lifetime EP0606034B1 (en) 1993-01-08 1993-12-28 Ophtalmic lenses grinding machine

Country Status (6)

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US (1) US5549503A (en)
EP (1) EP0606034B1 (en)
JP (1) JP3504708B2 (en)
DE (1) DE69311692T2 (en)
ES (1) ES2104104T3 (en)
FR (1) FR2700286B1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720021B1 (en) * 1994-05-19 1996-08-02 Buchmann Optical Eng Ophthalmic lens grinding machine comprising means for controlling the clamping value of the blank of the grinding glass.
JPH09277148A (en) * 1996-04-17 1997-10-28 Topcon Corp Method of lens peripheral edge grinding and device thereof
US5713784A (en) * 1996-05-17 1998-02-03 Mark A. Miller Apparatus for grinding edges of a glass sheet
JP2000015549A (en) * 1998-06-30 2000-01-18 Nidek Co Ltd Spectacle lens machining device
US20100217551A1 (en) * 2009-02-25 2010-08-26 Lonnie Calvin Goff Embedded microprocessor system for vehicular batteries
USD740949S1 (en) * 2013-09-09 2015-10-13 Essilor International (Compagnie Générale d'Optique) Ophthalmic lens edger
CN111958387B (en) * 2020-08-10 2022-08-05 浙江维真医疗科技有限公司 Glasses are made and are used lens corner equipment of polishing

Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0177402A1 (en) * 1984-10-03 1986-04-09 Briot International Grinding machines for spectacle glasses
EP0360669A1 (en) * 1988-09-22 1990-03-28 ESSILOR INTERNATIONAL Compagnie Générale d'Optique Template substitute for a grinding machine, especially a spectacle lens grinder
JPH04315563A (en) * 1991-04-16 1992-11-06 Nikon Corp Lens grinding device

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Publication number Priority date Publication date Assignee Title
FR2543039B1 (en) * 1983-03-22 1985-08-09 Essilor Int METHOD FOR BEVELING AN OPHTHALMIC LENS, AND CORRESPONDING AUTOMATIC GRINDING MACHINE
JPH01193160A (en) * 1988-01-26 1989-08-03 Nikon Corp Lens peripheral edge machining device
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.

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0177402A1 (en) * 1984-10-03 1986-04-09 Briot International Grinding machines for spectacle glasses
EP0360669A1 (en) * 1988-09-22 1990-03-28 ESSILOR INTERNATIONAL Compagnie Générale d'Optique Template substitute for a grinding machine, especially a spectacle lens grinder
JPH04315563A (en) * 1991-04-16 1992-11-06 Nikon Corp Lens grinding device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 17, no. 139 (M - 1385) 22 March 1993 (1993-03-22) *

Also Published As

Publication number Publication date
US5549503A (en) 1996-08-27
JP3504708B2 (en) 2004-03-08
ES2104104T3 (en) 1997-10-01
JPH0752015A (en) 1995-02-28
DE69311692D1 (en) 1997-07-24
FR2700286B1 (en) 1995-03-24
EP0606034B1 (en) 1997-06-18
DE69311692T2 (en) 1998-01-08
FR2700286A1 (en) 1994-07-13

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