EP0995547B1 - Method for determining the groove to be made on a lens - Google Patents

Method for determining the groove to be made on a lens Download PDF

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Publication number
EP0995547B1
EP0995547B1 EP99402576A EP99402576A EP0995547B1 EP 0995547 B1 EP0995547 B1 EP 0995547B1 EP 99402576 A EP99402576 A EP 99402576A EP 99402576 A EP99402576 A EP 99402576A EP 0995547 B1 EP0995547 B1 EP 0995547B1
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EP
European Patent Office
Prior art keywords
rigid part
groove
spectacle frame
lens
trajectory
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.)
Expired - Lifetime
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EP99402576A
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German (de)
French (fr)
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EP0995547A1 (en
Inventor
Laurent Guillermin
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EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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Publication of EP0995547A1 publication Critical patent/EP0995547A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • 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
    • B24B9/144—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 the spectacles being used as a template

Definitions

  • the present invention relates generally to the frames of "semi-ice” type glasses, that is to say glasses frames which, at the like those sold under the trade name "Nylor”, have, for each of their circles or circles, a rigid part and a strapping wire which extends from one to the other of the ends of this part rigid (see for example FR-A-2 499 442).
  • this groove extends continuously over the entire glass, and the rigid part of the circles or surrounds of the spectacle frame present, protruding, a bead, commonly called a mattress, by which it is itself adapted to be inserted in this groove, in the interval left free by the strapping wire.
  • the shape of the glass that is to say the shape of the outline of this glass, this shape being in practice apprehended by a contour reading on a flat template having the proper shape.
  • this groove is, to do this, systematically performed at a fixed distance from one of the two faces of the glass, or at mid-distance between these two faces.
  • this rigid part itself has a manufacturing certain camber, which is not necessarily the same as that of ascend.
  • the present invention generally relates to a provision to overcome this difficulty.
  • a process for the determination of the trajectory of the groove to be machined on the edge of a glass intended to equip a spectacle frame comprising, for each of its circles or surrounds, a rigid part and a strapping wire which extends from one at the other of the ends of this rigid part, this process being of a generally characterized in that for the portion of the trajectory of the groove corresponding to the rigid part concerned of the spectacle frame, we systematically take into account the camber of the useful portion of this rigid part.
  • the mattress provided for this purpose on this rigid part can fit exactly, and over its entire length, in the groove of the glass, at benefit of holding it.
  • the groove is produced in the usual manner.
  • this groove by itself corresponds to a minimum camber, so that, thus following the shortest possible trajectory, the strapping wire is itself stretched better, again, the benefit of holding the glass.
  • the groove made on the edge of the glass overall, two portions distinct in appearance with respect to each other, that is, a portion which, corresponding to the rigid part of the spectacle frame, is more or less wavy, and a portion which, corresponding to the strapping wire, is substantially straight.
  • the spectacle frame 10 to which the invention is more particularly intended comprises, for each of its circles or surrounds 11, in the manner of spectacle frames of the type "Semi-ice" means a rigid part 12 and a strapping wire 13 which extends from one to the other of the ends E 1 , E 2 of this rigid part 12.
  • the rigid part 12 of its circles or surrounds 11 comprises two parts, duly secured to each other, namely, on the one hand, a front bar 14, which, for example, is in one piece with the trigger guard 15 of the assembly and carries the knuckles 16 necessary for the articulation of a branch, and, on the other hand, a gallery 18, to which the strapping wire 13 is attached.
  • the front bar 14 is made of synthetic material
  • the gallery 18 is made of metal.
  • this groove 22 extends in practice continuously all around the glass 20, and the rigid part 12 has, itself, projecting, in the manner of a bead, a mattress 24 by which it is it also adapted to be inserted in the groove 22, in the space left free by the strapping wire 13 between its ends E 1 , E 2 .
  • the mattress 24 belongs obviously at gallery 18.
  • this gallery 18 has, in section transverse, a U-shaped profile, and the mattress 24 is formed by a tongue inserted in this gallery 18.
  • the groove 22 is produced by machining, with using a grooving machine.
  • the glass 20 is cut out beforehand, so that it is given the final form wanted for him.
  • a contour reading is carried out on this shape, for example using a flat template.
  • the glass 20 has a certain camber, with, overall, a curvature in each of two orthogonal planes, and, likewise, the rigid part 12 of the circles or surrounds 11 of the frame of glasses 10 to be fitted also has a certain camber, which is not not necessarily the same as the previous one.
  • the camber can be characterized by the bases B, B ' of its faces, that is to say by the base B of its front face 25 and by the base B 'of its rear face 25 '.
  • the camber of the rigid part 12 of the circles or surrounds 11 of a spectacle frame 10 can be characterized by the equivalent of such a base, i.e. by a quantity inversely proportional to the radius of the sphere on which the mattress fits 24.
  • the rigid part 12 of the mounting of glasses 10 has a mattress 24
  • the useful portion of this rigid part 12 which the camber is taken into account is preferably this mattress 24.
  • the mattress 24 has a trajectory from which it follows that its own camber is not identical to that of the remaining portion of this rigid part 12.
  • the practitioner after reading the outline relating to the shape of the glass 20 indicates, with the grooving machine, the position, on the circle or surrounding 11 concerned, of the rigid part 12 thereof, and the base of this rigid part 12.
  • the practitioner performs two contour readings, one which relates to a template for measuring the shape of the glass 20, and one which on the rigid part 12 of the spectacle frame 10, and, more precisely, on the mattress 24 of this rigid part 12, for the measurement of its camber and the statement of its position.
  • the ends E 1 , E 2 of the rigid part 12 of the spectacle frame 10 are also identified, and the grinding machine used is piloted accordingly, providing it the coordinates of these ends E 1 , E 2 .
  • the grooving machine duly programmed for this purpose, then calculates the trajectory T of the groove 22 on the edge 21 of the glass 20.
  • this portion of the trajectory T corresponds, by itself, to a camber minimum, so that, as already indicated above, the strapping wire 13 thus benefit from the shortest possible trajectory and therefore be thus more easily stretched.
  • the path T of the groove 22, and, therefore, this groove 22 itself thus comprise, successively, two portions T 1 , T 2 distinct in shape different, as shown in the block diagram of FIG. 4 on which this trajectory T is given as a function of the angle ⁇ made by, with any reference axis OX, FIG. 1, the radius r of each of the successive points of the groove 22.
  • the portion T 1 which corresponds to the rigid part 12 of the circle or surrounding 11 concerned, and which therefore extends from one to the other of the ends E 1 , E 2 of this rigid part 12, is generally wavy, by presenting for example two maxima and two minima.
  • the portion T 2 which corresponds to the strapping wire 13, is itself substantially straight, while for example being able to be very slightly bent.
  • these two portions T 1 , T 2 of the path T of the groove 22 are in continuity with one another, preferably connecting tangentially to one another, depending, for example, on '' a polynomial curve duly established for this purpose.
  • the maxima and minima of the portion T 1 of the path T of the groove 22 do not exactly coincide with those of these images I, I '.

Description

La présente invention concerne d'une manière générale les montures de lunettes de type «semi-glace», c'est-à-dire les montures de lunettes qui, à la manière de celles vendues sous la dénomination commerciale «Nylor», comportent, pour chacun de leurs cercles ou entourages, une partie rigide et un fil de cerclage qui s'étend de l'une à l'autre des extrémités de cette partie rigide (voir par example FR-A-2 499 442).The present invention relates generally to the frames of "semi-ice" type glasses, that is to say glasses frames which, at the like those sold under the trade name "Nylor", have, for each of their circles or circles, a rigid part and a strapping wire which extends from one to the other of the ends of this part rigid (see for example FR-A-2 499 442).

Pour l'emprise du fil de cerclage sur le verre à monter dans un tel cercle ou entourage, il est nécessaire d'usiner une rainure sur la tranche de ce verre.For the grip of the strapping wire on the glass to be mounted in such a circle or surrounding, it is necessary to machine a groove on the edge of this glass.

En pratique, cette rainure s'étend en continu sur la totalité du verre, et la partie rigide des cercles ou entourages de la monture de lunettes présente, en saillie, un bourrelet, communément appelé matelas, par lequel elle est elle-même adaptée à être insérée dans cette rainure, dans l'intervalle laissé libre par le fil de cerclage.In practice, this groove extends continuously over the entire glass, and the rigid part of the circles or surrounds of the spectacle frame present, protruding, a bead, commonly called a mattress, by which it is itself adapted to be inserted in this groove, in the interval left free by the strapping wire.

A ce jour, pour la détermination de la trajectoire de la rainure sur la tranche du verre lors de l'usinage de cette rainure, seule est prise en compte, pour le pilotage correspondant de la machine à rainurer alors mise en oeuvre, la forme du verre, c'est-à-dire la forme du contour de ce verre, cette forme étant en pratique appréhendée par une lecture de contour portant sur un gabarit plat ayant la forme adéquate.To date, for determining the trajectory of the groove on the edge of the glass during the machining of this groove, only is taken into account, for the corresponding control of the grooving machine then implemented, the shape of the glass, that is to say the shape of the outline of this glass, this shape being in practice apprehended by a contour reading on a flat template having the proper shape.

En pratique, également, il est ensuite simplement fait en sorte que la rainure effectuée reste dans les limites de la tranche du verre.In practice, too, it is then simply made so that the groove made remains within the edges of the glass edge.

Le plus souvent, cette rainure est, pour ce faire, systématiquement réalisée à une distance fixe de l'une des deux faces du verre, ou à mi-distance entre ces deux faces.Most often, this groove is, to do this, systematically performed at a fixed distance from one of the two faces of the glass, or at mid-distance between these two faces.

La rainure ainsi effectuée suit, au mieux, la cambrure propre au verre. The groove thus produced follows, at best, the camber specific to the glass.

Si, par sa flexibilité même, le fil de cerclage se satisfait de cette cambrure, en s'adaptant de lui-même à celle-ci, il n'en est évidemment pas de même de la partie rigide des cercles ou entourages de la monture de lunettes.If, by its very flexibility, the strapping wire is satisfied with this camber, by adapting itself to it, it is obviously not even of the rigid part of the circles or surrounds of the spectacle frame.

En effet, cette partie rigide présente, elle-même, de fabrication, une certaine cambrure, qui n'est pas nécessairement la même que celle du verre à monter.In fact, this rigid part itself has a manufacturing certain camber, which is not necessarily the same as that of ascend.

Ainsi, lorsque cela est possible, c'est-à-dire lorsque la monture de lunettes s'y prête, et cela est le cas par exemple lorsque cette monture de lunettes est en métal, le praticien doit, au montage, appliquer à l'estime une certaine torsion à la partie rigide des cercles ou entourages de cette monture de lunettes, afin d'adapter au mieux la cambrure de cette partie rigide à celle de la rainure sur le verre à monter.So when possible, that is, when the mount glasses are suitable, and this is the case for example when this frame of glasses are made of metal, the practitioner must, during assembly, apply a dead reckoning some twist to the rigid part of the circles or entourages of this frame glasses, in order to best adapt the camber of this rigid part to that of the groove on the glass to be mounted.

Par elle-même, cette torsion est délicate à effectuer, et elle est malaisée à contrôler.By itself, this twist is difficult to perform, and it is difficult to control.

Corollairement, si le praticien ne procède pas à cette torsion, ou si celle-ci s'avère impossible parce que la monture de lunettes ne s'y prête pas, la tenue du verre dans le cercle ou entourage dans lequel il a été monté est mal assurée, et l'esthétique de l'ensemble n'est en général pas totalement satisfaisante.As a corollary, if the practitioner does not perform this twist, or if it is impossible because the spectacle frame does not lend itself to it, the holding the glass in the circle or circle in which it was mounted is bad assured, and the overall aesthetic is generally not completely satisfactory.

La présente invention a d'une manière générale pour objet une disposition permettant de surmonter cette difficulté.The present invention generally relates to a provision to overcome this difficulty.

De manière plus précise, elle a pour objet un procédé pour la détermination de la trajectoire de la rainure à usiner sur la tranche d'un verre destiné à équiper une monture de lunettes comportant, pour chacun de ses cercles ou entourages, une partie rigide et un fil de cerclage qui s'étend de l'une à l'autre des extrémités de cette partie rigide, ce procédé étant d'une manière générale caractérisé en ce que, pour la portion de la trajectoire de la rainure correspondant à la partie rigide concernée de la monture de lunettes, on prend systématiquement en compte la cambrure de la portion utile de cette partie rigide. More specifically, it relates to a process for the determination of the trajectory of the groove to be machined on the edge of a glass intended to equip a spectacle frame comprising, for each of its circles or surrounds, a rigid part and a strapping wire which extends from one at the other of the ends of this rigid part, this process being of a generally characterized in that for the portion of the trajectory of the groove corresponding to the rigid part concerned of the spectacle frame, we systematically take into account the camber of the useful portion of this rigid part.

Ainsi, pour la portion de sa trajectoire correspondant à la partie rigide de la monture de lunettes, la rainure suit au mieux, voire parfaitement, la cambrure propre à cette partie rigide, au lieu de suivre celle du verre, étant entendu que, pour que les résultats soient satisfaisants, ces deux cambrures doivent évidemment être compatibles.Thus, for the portion of its trajectory corresponding to the rigid part of the spectacle frame, the groove follows at best, even perfectly, the camber specific to this rigid part, instead of following that of the glass, being understood that, for the results to be satisfactory, these two camber must obviously be compatible.

Dès lors, le matelas prévu à cet effet sur cette partie rigide peut s'emboíter exactement, et sur toute sa longueur, dans la rainure du verre, au bénéfice de la tenue de celui-ci.Therefore, the mattress provided for this purpose on this rigid part can fit exactly, and over its entire length, in the groove of the glass, at benefit of holding it.

Corollairement, pour la portion de sa trajectoire correspondant au fil de cerclage, la rainure est réalisée de manière usuelle.As a corollary, for the portion of its trajectory corresponding to the wire of strapping, the groove is produced in the usual manner.

Préférentiellement, cependant, il est fait en sorte que, dans les limites autorisées par la cambrure du verre et par l'épaisseur de celui-ci, cette rainure corresponde par elle-même à une cambrure minimale, pour que, suivant ainsi la trajectoire la plus courte possible, le fil de cerclage soit lui-même tendu au mieux, au bénéfice, là encore, de la tenue du verre.Preferably, however, it is ensured that, within the limits authorized by the camber of the glass and by the thickness of the latter, this groove by itself corresponds to a minimum camber, so that, thus following the shortest possible trajectory, the strapping wire is itself stretched better, again, the benefit of holding the glass.

Quoi qu'il en soit, du fait de la disposition suivant l'invention, la rainure effectuée sur la tranche du verre présente, globalement, deux portions distinctes d'allures différentes l'une par rapport à l'autre, à savoir, une portion qui, correspondant à la partie rigide de la monture de lunettes, est plus ou moins ondulée, et une portion qui, correspondant, elle, au fil de cerclage, est sensiblement rectiligne.Anyway, due to the arrangement according to the invention, the groove made on the edge of the glass, overall, two portions distinct in appearance with respect to each other, that is, a portion which, corresponding to the rigid part of the spectacle frame, is more or less wavy, and a portion which, corresponding to the strapping wire, is substantially straight.

Bien entendu, il est fait en sorte que ces deux portions de la rainure effectuée soient en continuité l'une avec l'autre, en se raccordant tangentiellement l'une à l'autre, pour éviter toute distorsion aux points de raccordement correspondants.Of course, it is made so that these two portions of the groove carried out in continuity with each other, by connecting tangentially to each other, to avoid any distortion at the points of corresponding connections.

Les caractéristiques et avantages de l'invention ressortiront d'ailleurs de la description qui va suivre, à titre d'exemple, en référence aux dessins schématiques annexés sur lesquels :

  • la figure 1 est une vue partielle en élévation d'une monture de lunettes de type «semi-glace» à laquelle est destinée l'invention, vue de l'arrière, avec un verre en place dans celui de ses cercles ou entourages qui est représenté ;
  • les figures 2 et 3 sont, à échelle supérieure, des vues partielles en coupe transversale de l'ensemble, suivant, chacune respectivement, les lignes II-II et III-III de la figure 1 ;
  • la figure 4 est un bloc diagramme représentant, de manière schématique, la trajectoire de la rainure présente sur la tranche du verre, supposée développée à plat.
    • The characteristics and advantages of the invention will become apparent from the description which follows, by way of example, with reference to the appended schematic drawings in which:
  • FIG. 1 is a partial elevation view of a spectacle frame of the “semi-ice” type for which the invention is intended, seen from the rear, with a glass in place in that of its circles or entourages which is represented ;
  • Figures 2 and 3 are, on a larger scale, partial cross-sectional views of the assembly, along, each respectively, the lines II-II and III-III of Figure 1;
  • FIG. 4 is a block diagram showing, schematically, the trajectory of the groove present on the edge of the glass, assumed to be developed flat.

    • Tel qu'illustré sur ces figures, et de manière connue en soi, la monture de lunettes 10 à laquelle est plus particulièrement destinée l'invention, comporte, pour chacun de ses cercles ou entourages 11, à la manière des montures de lunettes de type «semi-glace», une partie rigide 12 et un fil de cerclage 13 qui s'étend de l'une à l'autre des extrémités E1, E2 de cette partie rigide 12.As illustrated in these figures, and in a manner known per se, the spectacle frame 10 to which the invention is more particularly intended, comprises, for each of its circles or surrounds 11, in the manner of spectacle frames of the type "Semi-ice" means a rigid part 12 and a strapping wire 13 which extends from one to the other of the ends E 1 , E 2 of this rigid part 12.

    Une telle monture de lunettes 10 étant bien connue par elle-même, elle ne sera pas décrite dans tous ses détails ici.Such a spectacle frame 10 being well known in itself, it will not be described in full detail here.

    Il suffira d'indiquer que, dans la forme de réalisation représentée, la partie rigide 12 de ses cercles ou entourages 11 comporte deux pièces, dûment solidarisées l'une à l'autre, à savoir, d'une part, une barre frontale 14, qui, par exemple, est d'un seul tenant avec le pontet 15 de l'ensemble et porte les charnons 16 nécessaires à l'articulation d'une branche, et, d'autre part, une galerie 18, à laquelle est attelé le fil de cerclage 13.It will suffice to indicate that, in the embodiment shown, the rigid part 12 of its circles or surrounds 11 comprises two parts, duly secured to each other, namely, on the one hand, a front bar 14, which, for example, is in one piece with the trigger guard 15 of the assembly and carries the knuckles 16 necessary for the articulation of a branch, and, on the other hand, a gallery 18, to which the strapping wire 13 is attached.

    Par exemple, la barre frontale 14 est en matière synthétique, et la galerie 18 est en métal.For example, the front bar 14 is made of synthetic material, and the gallery 18 is made of metal.

    Les modalités suivant lesquelles le fil de cerclage 13 est attelé à la galerie 18 sont elles aussi bien connues par elles-mêmes, et elles ne seront donc pas non plus décrites ici.The manner in which the strapping wire 13 is coupled to the gallery 18 are also well known by themselves, and they will not be therefore also not described here.

    Pour le montage d'un verre 20 dans l'un ou l'autre des cercles ou entourages 11 d'une telle monture de lunettes 10 de type «semi-glace», il est nécessaire d'usiner, sur la tranche 21 de ce verre 20, une rainure 22 propre à permettre l'emprise du fil de cerclage 13 sur lui.For mounting a glass 20 in either of the circles or surrounds 11 of such a spectacle frame 10 of the “semi-ice” type, it is necessary to machine, on the edge 21 of this glass 20, a groove 22 suitable for allow the grip of the strapping wire 13 on it.

    Comme déjà précédemment indiqué, cette rainure 22 s'étend en pratique en continu tout autour du verre 20, et la partie rigide 12 présente, elle-même, en saillie, à la manière d'un bourrelet, un matelas 24 par lequel elle est elle aussi adaptée à être insérée dans la rainure 22, dans l'intervalle laissé libre par le fil de cerclage 13 entre ses extrémités E1, E2.As already indicated above, this groove 22 extends in practice continuously all around the glass 20, and the rigid part 12 has, itself, projecting, in the manner of a bead, a mattress 24 by which it is it also adapted to be inserted in the groove 22, in the space left free by the strapping wire 13 between its ends E 1 , E 2 .

    Dans la forme de réalisation représentée, le matelas 24 appartient évidemment à la galerie 18.In the embodiment shown, the mattress 24 belongs obviously at gallery 18.

    Par exemple, et tel que représenté, cette galerie 18 a, en section transversale, un profil en U, et le matelas 24 est formé par une languette insérée dans cette galerie 18.For example, and as shown, this gallery 18 has, in section transverse, a U-shaped profile, and the mattress 24 is formed by a tongue inserted in this gallery 18.

    De manière connue en soi, enfin, la rainure 22 est réalisée par usinage, à l'aide d'une machine à rainurer.In a manner known per se, finally, the groove 22 is produced by machining, with using a grooving machine.

    En pratique, formé initialement d'un palet de contour circulaire, le verre 20 est au préalable détouré, pour qu'il lui soit conféré la forme finale recherchée pour lui.In practice, initially formed by a circular contour puck, the glass 20 is cut out beforehand, so that it is given the final form wanted for him.

    Il est procédé pour ce faire à une lecture de contour portant sur cette forme, à l'aide par exemple d'un gabarit plat.To do this, a contour reading is carried out on this shape, for example using a flat template.

    En pratique, également, le verre 20 présente une certaine cambrure, avec, globalement, une courbure dans chacun de deux plans orthogonaux, et, de même, la partie rigide 12 des cercles ou entourages 11 de la monture de lunettes 10 à équiper présente, elle aussi, une certaine cambrure, qui n'est pas nécessairement la même que la précédente.In practice, too, the glass 20 has a certain camber, with, overall, a curvature in each of two orthogonal planes, and, likewise, the rigid part 12 of the circles or surrounds 11 of the frame of glasses 10 to be fitted also has a certain camber, which is not not necessarily the same as the previous one.

    Pour le verre 20, la cambrure peut être caractérisée par les bases B, B' de ses faces, c'est-à-dire par la base B de sa face avant 25 et par la base B' de sa face arrière 25'.For glass 20, the camber can be characterized by the bases B, B ' of its faces, that is to say by the base B of its front face 25 and by the base B 'of its rear face 25 '.

    Ainsi qu'on le sait, ces bases B, B' sont définies par les formules suivantes : B = n - 1 R    B' = n - 1 R' dans lesquelles R et R' sont les rayons des faces 25, 25' concernées et n l'indice de réfraction.As we know, these bases B, B 'are defined by the following formulas: B = not - 1 R B '= not - 1 R ' in which R and R 'are the radii of the faces 25, 25' concerned and n the refractive index.

    Par extension, la cambrure de la partie rigide 12 des cercles ou entourages 11 d'une monture de lunettes 10 peut être caractérisée par l'équivalent d'une telle base, c'est-à-dire par une grandeur inversement proportionnelle au rayon de la sphère sur laquelle s'inscrit son matelas 24.By extension, the camber of the rigid part 12 of the circles or surrounds 11 of a spectacle frame 10 can be characterized by the equivalent of such a base, i.e. by a quantity inversely proportional to the radius of the sphere on which the mattress fits 24.

    Suivant l'invention, pour la détermination de la trajectoire de la rainure 22 à usiner sur la tranche 21 d'un verre 20 destiné à équiper une monture de lunettes 10 de type «semi-glace», et, plus précisément, pour la portion de la trajectoire de cette rainure 22 correspondant à la partie rigide 12 concernée de cette monture de lunettes 10, on prend systématiquement en compte la cambrure de la portion utile de cette partie rigide 12.According to the invention, for determining the trajectory of the groove 22 to be machined on the edge 21 of a lens 20 intended to equip a frame of glasses 10 of the “semi-ice” type, and, more precisely, for the portion of the trajectory of this groove 22 corresponding to the rigid part 12 concerned with this spectacle frame 10, we systematically take into account the camber of the useful portion of this rigid part 12.

    Lorsque, comme en l'espèce, la partie rigide 12 de la monture de lunettes 10 présente un matelas 24, la portion utile de cette partie rigide 12 dont on prend en compte la cambrure est, préférentiellement, ce matelas 24.When, as in this case, the rigid part 12 of the mounting of glasses 10 has a mattress 24, the useful portion of this rigid part 12 which the camber is taken into account is preferably this mattress 24.

    Il peut s'avérer, en effet, que, sur cette partie rigide 12, le matelas 24 ait une trajectoire dont il résulte que sa cambrure propre n'est pas identique à celle de la portion restante de cette partie rigide 12.It may indeed turn out that, on this rigid part 12, the mattress 24 has a trajectory from which it follows that its own camber is not identical to that of the remaining portion of this rigid part 12.

    Par exemple, suivant une première forme de mise en oeuvre de l'invention, on prend en compte, pour le pilotage de la machine à rainurer mise en oeuvre, en complément des résultats d'une lecture de contour portant, comme précédemment, sur la forme du verre 20, un paramètre lié à la cambrure de la portion utile de la partie rigide 12 de la monture de lunettes 10.For example, according to a first form of implementation of the invention, we take into account, for the control of the grooving machine put implemented, in addition to the results of a bearing contour reading, as before, on the shape of the glass 20, a parameter linked to the camber of the useful portion of the rigid part 12 of the spectacle frame 10.

    Préférentiellement, le paramètre ainsi pris en compte est une grandeur inversement proportionnelle au rayon de la sphère sur laquelle s'inscrit la portion utile de la partie rigide 12 de la monture de lunettes 10, c'est-à-dire son matelas 24.Preferably, the parameter thus taken into account is a quantity inversely proportional to the radius of the sphere on which the useful portion of the rigid part 12 of the spectacle frame 10, that is to say his mattress 24.

    Autrement dit, suivant cette première forme de mise en oeuvre de l'invention, le praticien, après la lecture de contour portant sur la forme du verre 20 indique, à la machine à rainurer, la position, sur le cercle ou entourage 11 concerné, de la partie rigide 12 de celui-ci, et la base de cette partie rigide 12.In other words, according to this first form of implementation of the invention, the practitioner, after reading the outline relating to the shape of the glass 20 indicates, with the grooving machine, the position, on the circle or surrounding 11 concerned, of the rigid part 12 thereof, and the base of this rigid part 12.

    En variante, suivant une autre forme de mise en oeuvre de l'invention, on prend en compte, pour le pilotage de la machine à rainurer mise en oeuvre, en complément, comme précédemment, des résultats d'une lecture de contour portant sur la forme du verre 20, les résultats d'une lecture de contour portant sur la portion utile de la partie rigide 12 de la monture de lunettes 10, c'est-à-dire sur le matelas 24 de cette partie rigide 12, et précisant la position de celle-ci par rapport au verre 20.As a variant, according to another form of implementation of the invention, we take into account, for the control of the grooving machine used, in addition, as before, the results of a contour reading relating to the shape of the glass 20, the results of a contour reading bearing on the useful portion of the rigid part 12 of the spectacle frame 10, that is to say on the mattress 24 of this rigid part 12, and specifying the position of this with respect to the glass 20.

    Autrement dit, suivant cette deuxième forme de mise en oeuvre, plus automatisée, de l'invention, le praticien effectue deux lectures de contour, une qui porte sur un gabarit pour le relevé de la forme du verre 20, et une qui porte sur la partie rigide 12 de la monture de lunettes 10, et, plus précisément, sur le matelas 24 de cette partie rigide 12, pour le relevé de sa cambrure et le relevé de sa position.In other words, according to this second form of implementation, more automated, of the invention, the practitioner performs two contour readings, one which relates to a template for measuring the shape of the glass 20, and one which on the rigid part 12 of the spectacle frame 10, and, more precisely, on the mattress 24 of this rigid part 12, for the measurement of its camber and the statement of its position.

    Dans l'un et l'autre cas, on repère en outre, les extrémités E1, E2 de la partie rigide 12 de la monture de lunettes 10, et on pilote en conséquence la machine à meuler mise en oeuvre, en lui fournissant les coordonnées de ces extrémités E1, E2.In both cases, the ends E 1 , E 2 of the rigid part 12 of the spectacle frame 10 are also identified, and the grinding machine used is piloted accordingly, providing it the coordinates of these ends E 1 , E 2 .

    Dans l'un et l'autre cas, également, la machine à rainurer, dûment programmée à cet effet, calcule ensuite d'elle-même la trajectoire T de la rainure 22 sur la tranche 21 du verre 20.In either case, also, the grooving machine, duly programmed for this purpose, then calculates the trajectory T of the groove 22 on the edge 21 of the glass 20.

    Préférentiellement, pour la portion de cette trajectoire T correspondant au fil de cerclage 13, on fait en sorte, par la programmation correspondante, que, dans les limites autorisées par la cambrure du verre 20, c'est-à-dire dans les limites autorisées par les bases B, B' de ses faces avant 25 et arrière 25', ainsi que dans les limites autorisées par l'épaisseur e de ce verre 20, cette portion de la trajectoire T corresponde, par elle-même, à une cambrure minimale, pour que, comme déjà précédemment indiqué, le fil de cerclage 13 bénéfice ainsi de la trajectoire la plus courte possible et soit donc ainsi plus facilement tendu.Preferably, for the portion of this trajectory T corresponding with the strapping wire 13, we make sure, by the corresponding programming, that, within the limits authorized by the camber of the lens 20, that is to say in the limits authorized by the bases B, B 'of its front faces 25 and rear 25', as well as within the limits authorized by the thickness e of this glass 20, this portion of the trajectory T corresponds, by itself, to a camber minimum, so that, as already indicated above, the strapping wire 13 thus benefit from the shortest possible trajectory and therefore be thus more easily stretched.

    Suivant l'invention, et tel que déjà souligné ci-dessus, la trajectoire T de la rainure 22, et, donc, cette rainure 22 elle-même, comportent, ainsi, successivement, deux portions T1, T2 distinctes d'allures différentes, comme représenté sur le bloc diagramme de la figure 4 sur lequel cette trajectoire T est donnée en fonction de l'angle  que fait, avec un quelconque axe de référence OX, figure 1, le rayon r de chacun des points successifs de la rainure 22.According to the invention, and as already emphasized above, the path T of the groove 22, and, therefore, this groove 22 itself, thus comprise, successively, two portions T 1 , T 2 distinct in shape different, as shown in the block diagram of FIG. 4 on which this trajectory T is given as a function of the angle  made by, with any reference axis OX, FIG. 1, the radius r of each of the successive points of the groove 22.

    La portion T1, qui correspond à la partie rigide 12 du cercle ou entourage 11 concerné, et qui s'étend donc de l'une à l'autre des extrémités E1, E2 de cette partie rigide 12, est globalement ondulée, en présentant par exemple deux maxima et deux minima.The portion T 1 , which corresponds to the rigid part 12 of the circle or surrounding 11 concerned, and which therefore extends from one to the other of the ends E 1 , E 2 of this rigid part 12, is generally wavy, by presenting for example two maxima and two minima.

    En revanche, la portion T2, qui correspond au fil de cerclage 13, est, elle, sensiblement rectiligne, tout en pouvant par exemple être très légèrement cintrée.On the other hand, the portion T 2 , which corresponds to the strapping wire 13, is itself substantially straight, while for example being able to be very slightly bent.

    Bien entendu, ces deux portions T1, T2 de la trajectoire T de la rainure 22 sont en continuité l'une avec l'autre, en se raccordant préférentiellement tangentiellement l'une à l'autre, en fonction, par exemple, d'une courbe polynomiale dûment établie à cet effet.Of course, these two portions T 1 , T 2 of the path T of the groove 22 are in continuity with one another, preferably connecting tangentially to one another, depending, for example, on '' a polynomial curve duly established for this purpose.

    Sur le bloc diagramme de la figure 4, ont été en outre indiquées, en traits interrompus, les images I, I' des faces avant 25 et arrière 25' du verre 20 au niveau de la forme de celui-ci, c'est-à-dire, en pratique, au niveau de sa tranche.In the block diagram of FIG. 4, have also been indicated, in broken lines, images I, I 'of the front 25 and rear 25' sides of the lens 20 in terms of its form, that is to say, in practice, in terms of its slice.

    Ainsi qu'on le notera, les maxima et minima de la portion T1 de la trajectoire T de la rainure 22 ne coïncident pas exactement avec ceux de ces images I, I'.As will be noted, the maxima and minima of the portion T 1 of the path T of the groove 22 do not exactly coincide with those of these images I, I '.

    Bien entendu, la présente invention ne se limite pas aux formes de mise en oeuvre décrites et représentées, mais englobe toute variante d'exécution selon les revendications.Of course, the present invention is not limited to the forms of placing described and shown, but includes any variant according to the claims.

    Claims (7)

    1. Method of determining the trajectory (T) of the groove (22) to be machined in the edge (21) of a lens (20) intended to be fitted to a spectacle frame (10) in which each of the rims or surrounds (11) has a rigid part (12) and a filament (13) which extends from one end (E1) to the other end (E2) of the rigid part (12), characterized in that the curvature of the active portion of the rigid part (12) is systematically taken into account over the portion (T1) of the trajectory (T) of the groove (22) corresponding to the rigid part (12) concerned of the spectacle frame (10).
    2. Method according to claim 1, characterized in that a parameter related to the curvature of the active portion of the rigid part (12) of the spectacle frame (10) is taken into account in controlling the grooving machine employed, in addition to the results of contour reading relating to the shape of the lens (20).
    3. Method according to claim 2, characterized in that the parameter taken into account is a magnitude inversely proportional to the radius of the sphere on which is inscribed the active portion of the rigid part (12) of the spectacle frame (10).
    4. Method according to claim 1, characterized in that the results of a contour reading relating to the active portion of the rigid part (12) of the spectacle frame (10) and specifying the position thereof relative to the lens (20) are taken into account in controlling the grooving machine employed, in addition to the results of contour reading relating to the shape of the lens (20).
    5. Method according to any one of claims 1 to 3, characterized in that the rigid part (12) of the spectacle frame (10) has a projecting bead-like cushion (24) by which it is adapted to be inserted in the groove (22) and the active portion of the rigid part (12) whose curvature is taken into account is the cushion (24).
    6. Method according to any one of claims 1 to 5, characterized in that the portion (T2) of the trajectory (T) itself corresponds to a minimum curvature over the portion (T2) of the trajectory (T) of the groove (22) corresponding to the filament (13), within limits authorized by the curvature of the lens (20) and within limits authorized by the thickness (e) of the lens (20).
    7. Method according to any one of claims 1 to 6, characterized in that the positions of the ends (E1, E2) of the rigid part (12) of the spectacle frame (10) are identified and the grinding machine employed is controlled accordingly.
    EP99402576A 1998-10-22 1999-10-19 Method for determining the groove to be made on a lens Expired - Lifetime EP0995547B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9813243 1998-10-22
    FR9813243A FR2784920B1 (en) 1998-10-22 1998-10-22 METHOD FOR DETERMINING THE TRAJECTORY OF THE GROOVE TO BE MACHINED ON THE EDGE OF A LENS INTENDED TO FIT A FRAME WITH "SEMI-GLAZED" TYPE GLASSES

    Publications (2)

    Publication Number Publication Date
    EP0995547A1 EP0995547A1 (en) 2000-04-26
    EP0995547B1 true EP0995547B1 (en) 2002-04-03

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP99402576A Expired - Lifetime EP0995547B1 (en) 1998-10-22 1999-10-19 Method for determining the groove to be made on a lens

    Country Status (6)

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    US (1) US6510362B1 (en)
    EP (1) EP0995547B1 (en)
    JP (1) JP2000131652A (en)
    DE (1) DE69901148T2 (en)
    ES (1) ES2171322T3 (en)
    FR (1) FR2784920B1 (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JP4064361B2 (en) * 2004-03-15 2008-03-19 川崎重工業株式会社 Method for acquiring position information of transfer position of transfer device

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2499442A1 (en) * 1981-02-10 1982-08-13 Hoya Lens Corp Groove cutter for lens - has rotary diamond cutter with rotating lens holder holding lens at centre
    DE4208835A1 (en) * 1992-03-19 1993-09-30 Wernicke & Co Gmbh Method for shape grinding the circumference of a spectacle lens
    JPH0639697A (en) * 1992-04-14 1994-02-15 Wernicke & Co Gmbh Processing machine for eyeglass lens edge
    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.
    FR2728187A1 (en) * 1994-12-19 1996-06-21 Essilor Int Marking bevel or machining groove for spectacle lenses

    Also Published As

    Publication number Publication date
    US6510362B1 (en) 2003-01-21
    EP0995547A1 (en) 2000-04-26
    DE69901148D1 (en) 2002-05-08
    FR2784920A1 (en) 2000-04-28
    JP2000131652A (en) 2000-05-12
    FR2784920B1 (en) 2001-01-19
    DE69901148T2 (en) 2002-08-22
    ES2171322T3 (en) 2002-09-01

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