EP0740979A1 - Blocking tool for machining optical lenses and the process for using it - Google Patents

Blocking tool for machining optical lenses and the process for using it Download PDF

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Publication number
EP0740979A1
EP0740979A1 EP96400919A EP96400919A EP0740979A1 EP 0740979 A1 EP0740979 A1 EP 0740979A1 EP 96400919 A EP96400919 A EP 96400919A EP 96400919 A EP96400919 A EP 96400919A EP 0740979 A1 EP0740979 A1 EP 0740979A1
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EP
European Patent Office
Prior art keywords
base
wheel
superstructure
wheel according
junction
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
EP96400919A
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German (de)
French (fr)
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EP0740979B1 (en
Inventor
Jacques Moreau
Jean Perrin
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EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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Publication of EP0740979A1 publication Critical patent/EP0740979A1/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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices

Definitions

  • the present invention relates in general to the slipping of an optical lens, that is to say the establishment thereon of a gripping block capable of allowing it to be locked in rotation on a tool. drive during its machining.
  • a gripping block For the machining of any of the faces of such an ophthalmic lens in its final configuration, whether it is its roughing or whether it is its smoothing or polishing, it is necessary to establish, on the other side of this ophthalmic lens, a gripping block, so that, by the drive tool of a machine suitable for this purpose, it can be held in application against the corresponding surfacing tool .
  • this gripping block was reported by pitch on the ophthalmic lens.
  • pre-wheel a simple junction mat interposed between the ophthalmic lens and a prefabricated part, which, with reference to the wooden wheel on which an ophthalmic lens was formerly placed to work it, is usually called pre-wheel.
  • the pre-dial implemented in. Comprises, overall, on the one hand, a base, by which it is intended to be locked in rotation on the ophthalmic lens to be machined, by means, therefore, of a mattress metal junction with low melting point melted in situ, and, on the other hand, a superstructure, by which it is capable of being capped by a drive tool.
  • This pre-dial can advantageously be used successively for many ophthalmic lenses.
  • the pre-wheel is hollow, and, the arrival of the molten metal being made by the recess which it presents. axially, only intervenes in practical for setting in rotation of the junction mat obtained a limited number of lugs formed by means of blind holes provided hollow for this purpose on the lower surface of the base.
  • the setting in rotation of the junction mat, and therefore of the ophthalmic lens, on the pre-wheel is relatively uncertain, at the risk of an inaccuracy in the maintenance of the ophthalmic lens during its machining, and, therefore, here again, to the detriment of the accuracy of the machined surface.
  • the present invention generally relates to a provision making it possible to avoid these drawbacks.
  • a pre-dial for the sliding of an optical lens of the type comprising, on the one hand, a base, by which it is intended to be locked in rotation on the optical lens to be machined, by means of a metal junction mat with low melting point melted in situ, and, on the other hand, a superstructure, by which it is capable of being capped by a drive tool , this pre-wheel being generally characterized in that its base is peripherally set back with respect to its superstructure.
  • junction mat it is advantageously possible to allow the junction mat to form around the base of the pre-wheel a bearing specific to the grip of the drive tool.
  • the present invention also relates to a method of implementing this pre-dial, which is of the type according to which one establishes between this pre-dial and the optical lens to be fitted, for its setting in rotation on this, a metal junction mat with low melting point melted in situ, and which is generally characterized in that it is made so that junction mat peripherally encloses the base of the pre-wheel by annularly forming around this base a bearing specific to the grip of the drive tool.
  • this grip is transferred from the pre-dial to the junction mat.
  • the pre-wheel is advantageously provided, and, less subject to wear, it can be used a greater number of times without the surfacing conditions of successively treated optical lenses being compromised.
  • the junction mattress coats the base of the pre-wheel is advantageously favorable to good anchoring of this junction mattress on this pre-wheel, and therefore by wedging in rotation which results therefrom, to good maintenance of the optical lens during its surfacing, again, to the benefit of the precision of the machined surface.
  • this anchoring can advantageously be done on the lateral surface of the base, which, on the one hand, is, in general, more extensive than its lower surface, and which, on the other hand, is in any point at a greater distance from the axis of the assembly, for the benefit of the torque efficiency of the corresponding anchor points.
  • the base of the pre-wheel according to the invention comprises, in the hollow, on its lateral surface, at least one notch, and, preferably, several notches distributed circularly.
  • the junction mat encircles the base of the pre-cutter is advantageously combined with a peripheral arrival of the molten metal, which advantageously spares the central area of the treated optical lens, by reducing the risks of an untimely development of constraint in it.
  • FIG. 1 it is a question, overall, of ensuring the sliding of an optical lens 10 to be machined, that is to say of equipping this optical lens 10 with a gripping block 11 suitable for allowing a drive tool 12 to apply it to a grinding wheel 13 or any other tool suitable for the desired surfacing.
  • the face 14 to be machined of the optical lens 10 is the concave face, and this is the most usual case when this optical lens 10 is an ophthalmic lens.
  • the drive tool 12 and the grinding wheel 13 are well known in themselves, and not falling within the scope of the present invention, they will not be described here.
  • the drive tool 12 is in the shape of a bell, so as to be able to cover the gripping block 11.
  • the gripping block 11 implements a pre-wheel 15, which, according to arrangements described in more detail later, generally comprises, on the one hand, a base 16, by which it is intended to be locked in rotation on the optical lens 10 to be machined, by means of a mattress junction 17 made of metal with a low melting point melted in situ, and, on the other hand, a superstructure 18, by which it is capable of being capped by the drive tool 12.
  • the pre-wheel 15 is a part of revolution, of axis A shown diagrammatically in broken lines in the figures.
  • the lateral surface 20 of the superstructure 18 of the pre-wheel 15 is generally frustoconical, going in converging direction of its upper surface 21.
  • this upper surface 21 is planar, extending substantially perpendicular to the axis A, and the superstructure 18 has, recessed on this upper surface 21, on the one hand, axially, a clearance 23, which is entirely circumscribed annularly by its periphery, and, on the other hand, for cooperation with the drive tool 12, a diametrical groove 24, which, intersecting the clearance 23, is divided into two sections by the latter.
  • the base 16 of the pre-wheel 15 is peripherally set back with respect to its superstructure 18, so as to allow the junction mat 17 to form around it, as shown in line continuous in FIG. 1 and as shown diagrammatically in broken lines in FIG. 3, a bearing surface 25 specific to the grip of the drive tool 12.
  • this bearing 25 is a cylindrical bearing of circular cross section centered on the axis A.
  • the lateral surface 26 of the base 16 forms with the lateral surface 20 of the superstructure 18 an edge 27, and it is from this edge 27 that the bearing surface 25 extends.
  • the lateral surface 26 of the base 16 comprises, from the edge 27, a first section 26A, which is generally frustoconical, and which converges towards its lower surface 28, and a second section 26B, which is also generally frustoconical, but which, unlike the first, diverges in the direction of the lower surface 28.
  • the lateral surface 26 of the base 16 comprises a third section 26C, which is generally cylindrical, extending peripherally along a circumference of diameter smaller than that of the circumference which extends the edge 27, and which, axially, extends to the lower surface 28.
  • this base 16 is generally set back with respect to the edge 27 which it forms with the superstructure 18, and therefore with respect to the latter .
  • the base 16 of this pre-wheel 15 has, in the recess, on its lateral surface 26, at least one notch 29.
  • notches 29 are provided, being suitably distributed circularly.
  • these notches 29, all identical to each other, are four in number, and they are generally arranged in a cross around the axis A of the assembly.
  • each of the notches 29 only arises at a distance from the edge 27 that the base 16 forms with the superstructure 18 and, on the contrary, extends to the lower surface 28 of this base 16, while biting in crescent on this lower surface 28.
  • each of the notches 29 is formed by the conjunction of two surfaces, namely, on the one hand, a flat surface 30, which extends substantially perpendicular to the axis A, at a distance of the lower surface 28, and, on the other hand, a surface curve 31, which, starting from the contour of the planar surface 30, extends generally at an angle relative to the axis A and joins the lower surface 28.
  • the lower surface 28 of the base 16 is flat, extending perpendicular to the axis A.
  • this clearance 23 is closed at its base by a full bottom 32.
  • the pre-wheel 15 according to the invention comprises an angular orientation reference 33.
  • this angular orientation reference 33 is formed by a groove, which, in hollow, affecting the upper surface 21 of the superstructure 18, is spaced, angularly, from the diametrical groove 24 that this presents this.
  • this angular orientation mark 33 can also be formed by a simple groove locally affecting the lower surface 28 of the base 16.
  • pre-wheel 15 For the implementation of the pre-wheel 15 according to the invention, it is, for example, as follows.
  • this pre-wheel 15 is engaged by its superstructure 18 in a recess 35 provided for this purpose in hollow on the surface of a wedge shape 36 slightly inclined.
  • this ring 37 can be an integral part of the wedging form 36.
  • the optical lens 10 to be fitted is then attached to the assembly, along the axis A of the pre-wheel 15.
  • the connecting mat 17 obtained comprises, in addition to the bearing surface 25, a shoulder 40, which extends perpendicular to the axis A of the assembly, and, beyond this shoulder 40 , a blooming 41 whose lateral surface 42 is generally frustoconical, going diverging from the shoulder 40.
  • the junction mat 17 thus established between the pre-wheel 15 and the optical lens 10 to be fitted surrounds peripherally, by coating it, the base 16 of the pre-wheel 15, by annularly forming around this base 16 the bearing surface 25 specific to the grip of the drive tool 12.
  • this bearing surface 25 extends immediately from the superstructure 18 of the pre-wheel 15, flush with it.
  • the surface 25 extends to the edge 27 that the base 16 forms with the superstructure 18, thus being in a way in continuity with the latter.
  • the base 16 of the pre-wheel 15 has, in the hollow, on its lower surface 28, a clearance 43, which is entirely circumscribed annularly by its periphery, and which is blind.
  • the present invention is not limited to the embodiments described and shown, but encompasses any variant, in particular as regards the number and / or the configuration of the notches preferably provided on the lateral surface of the base. of the pre-wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)
  • Coloring (AREA)
  • Prostheses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The lens holder consists of a base (16) to which the lens can be attached for machining by a pad (17). The pad is made from a low-melting point metal, and a superstructure (18) designed to receive a drive tool. The base is recessed peripherally in relation to the superstructure. The base is made in two truncated conical sections, joined by their smaller ends, with at least one notch (29) in it. The upper surface (21) of the lens holder's superstructure has a circular recess (23) and a notch (33) for angular positioning.

Description

La présente invention concerne d'une manière générale le glantage d'une lentille optique, c'est-à-dire l'établissement sur celle-ci d'un bloc de préhension propre à permettre de la caler en rotation sur un outil d'entraînement lors de son usinage.The present invention relates in general to the slipping of an optical lens, that is to say the establishment thereon of a gripping block capable of allowing it to be locked in rotation on a tool. drive during its machining.

Elle vise plus particulièrement, mais non nécessairement exclusivement, le cas d'une lentille ophtalmique.It relates more particularly, but not necessarily exclusively, to the case of an ophthalmic lens.

Pour l'usinage d'une quelconque des faces d'une telle lentille ophtalmique à sa configuration définitive, qu'il s'agisse de son ébauchage ou qu'il s'agisse de son doucissage ou de son polissage, il est nécessaire d'établir, sur l'autre des faces de cette lentille ophtalmique, un bloc de préhension, pour que, par l'outil d'entraînement d'une machine appropriée à cet effet, elle puisse être maintenue en application contre l'outil de surfaçage correspondant.For the machining of any of the faces of such an ophthalmic lens in its final configuration, whether it is its roughing or whether it is its smoothing or polishing, it is necessary to establish, on the other side of this ophthalmic lens, a gripping block, so that, by the drive tool of a machine suitable for this purpose, it can be held in application against the corresponding surfacing tool .

Initialement, ce bloc de préhension a été rapporté par de la poix sur la lentille ophtalmique.Initially, this gripping block was reported by pitch on the ophthalmic lens.

Il a ensuite été proposé de le réaliser in situ, par coulée d'un métal à bas point de fusion, en pratique un mélange de plomb et de cadmium, susceptible d'assurer l'adhérence nécessaire tout en pouvant ensuite être aisément éliminé.It has then been proposed to produce it in situ, by casting a metal with a low melting point, in practice a mixture of lead and cadmium, capable of ensuring the necessary adhesion while then being able to be easily eliminated.

Jusqu'à un passé assez récent, il a été proposé de réaliser d'un seul tenant ce bloc de préhension.Until a fairly recent past, it has been proposed to carry out in one piece this gripping block.

Une telle disposition présentait de nombreux inconvénients.Such an arrangement had many disadvantages.

Tout d'abord, elle nécessitait un volume de métal important, et, donc, un temps de coulée relativement long.First, it required a large volume of metal, and therefore a relatively long casting time.

En outre, du fait de l'importance de la masse de métal à température de fusion appliquée à la lentille ophtalmique, le choc thermique dont était l'objet celle-ci était relativement important.In addition, due to the importance of the mass of metal at melting temperature applied to the ophthalmic lens, the thermal shock to which it was subjected was relatively large.

Enfin, et surtout, compte tenu de l'épaisseur même de cette masse de métal, il se créait fréquemment au refroidissement, entre la lentille ophtalmique et le bloc de préhension, dans la zone centrale de celui-ci, un certain vide, qui, d'une part, conduisait à une dégradation de la tenue du bloc de préhension sur la lentille ophtalmique, au détriment du calage en rotation recherché, et qui, d'autre part, induisait par aspiration une certaine déformation élastique de la lentille ophtalmique, en sorte que, lorsque, une fois détachée, cette lentille ophtalmique reprenait sa configuration initiale, sa face usinée ne présentait pas nécessairement toute la précision souhaitable.Finally, and above all, given the very thickness of this mass of metal, it was frequently created on cooling, between the ophthalmic lens and the gripping block, in the central zone thereof, a certain vacuum, which, on the one hand, led to a deterioration in the behavior of the gripping block on the ophthalmic lens, to the detriment of the desired rotation setting, and which, on the other hand, induced by suction a certain elastic deformation of the ophthalmic lens, so that, when, once detached, this ophthalmic lens resumed its initial configuration, its machined face did not necessarily have all the desirable precision.

Pour minimiser, sinon annuler, ces inconvénients, il a été proposé de réduire l'épaisseur de la masse de métal à mettre en oeuvre, en réduisant cette masse à un simple matelas de jonction interposé entre la lentille ophtalmique et une pièce préfabriquée, qui, par référence à la molette en bois sur laquelle on plaçait autrefois une lentille ophtalmique pour la travailler, est usuellement appelée pré-molette.To minimize, if not eliminate, these drawbacks, it has been proposed to reduce the thickness of the mass of metal to be used, by reducing this mass to a simple junction mat interposed between the ophthalmic lens and a prefabricated part, which, with reference to the wooden wheel on which an ophthalmic lens was formerly placed to work it, is usually called pre-wheel.

C'est le cas, par exemple, dans la demande de brevet européen No 0 567 894.This is the case, for example, in European patent application No. 0 567 894.

La pré-molette mis.e en oeuvre comporte, globalement, d'une part, une embase, par laquelle elle est destinée à être calée en rotation sur la lentille ophtalmique à usiner, par l'intermédiaire, donc, d'un matelas de jonction en métal à bas point de fusion fondu in situ, et, d'autre part, une superstructure, par laquelle elle est apte à être coiffée par un outil d'entraînement.The pre-dial implemented in. Comprises, overall, on the one hand, a base, by which it is intended to be locked in rotation on the ophthalmic lens to be machined, by means, therefore, of a mattress metal junction with low melting point melted in situ, and, on the other hand, a superstructure, by which it is capable of being capped by a drive tool.

Cette pré-molette peut avantageusement resservir successivement pour de nombreuses lentilles ophtalmiques.This pre-dial can advantageously be used successively for many ophthalmic lenses.

Mais, à ce jour, elle forme par elle-même la portée, en pratique cylindrique, sur laquelle intervient l'outil d'entraînement pour enserrer l'ensemble.But, to date, it forms by itself the bearing, in cylindrical practice, on which the drive tool intervenes to grip the assembly.

Il en résulte inévitablement une usure progressive de cette pré-molette au fur et à mesure de ses utilisations.This inevitably results in progressive wear of this pre-wheel as and when it is used.

Cette usure est en pratique incompatible avec les contraintes de précision d'usinage à respecter pour les lentilles ophtalmiques traitées.This wear is in practice incompatible with the constraints of machining precision to be observed for the treated ophthalmic lenses.

En outre, le plus souvent, et c'est le cas dans la demande de brevet européen mentionnée ci-dessus, la pré-molette est creuse, et, l'arrivée du métal en fusion se faisant par l'évidement qu'elle présente axialement, seul intervient en pratique pour le calage en rotation du matelas de jonction obtenu un nombre limité d'ergots formés à la faveur de trous borgnes prévus en creux à cet effet sur la surface inférieure de l'embase.In addition, most often, and this is the case in the European patent application mentioned above, the pre-wheel is hollow, and, the arrival of the molten metal being made by the recess which it presents. axially, only intervenes in practical for setting in rotation of the junction mat obtained a limited number of lugs formed by means of blind holes provided hollow for this purpose on the lower surface of the base.

Le calage en rotation du matelas de jonction, et donc de la lentille ophtalmique, sur la pré-molette s'en trouve relativement incertain, au risque d'une imprécision dans le maintien de la lentille ophtalmique lors de son usinage, et, donc, là encore, au détriment de l'exactitude de la surface usinée.The setting in rotation of the junction mat, and therefore of the ophthalmic lens, on the pre-wheel is relatively uncertain, at the risk of an inaccuracy in the maintenance of the ophthalmic lens during its machining, and, therefore, here again, to the detriment of the accuracy of the machined surface.

En outre, l'arrivée centrale du métal fondu soumet inévitablement la lentille ophtalmique à des contraintes non négligeables dans la zone même de cette lentille ophtalmique qui est la plus critique pour elle.In addition, the central arrival of the molten metal inevitably subjects the ophthalmic lens to significant stresses in the very area of this ophthalmic lens which is the most critical for it.

La présente invention a d'une manière générale pour objet une disposition permettant d'éviter ces inconvénients.The present invention generally relates to a provision making it possible to avoid these drawbacks.

De manière plus précise, elle a tout d'abord pour objet une pré-molette pour le glantage d'une lentille optique, du genre comportant, d'une part, une embase, par laquelle elle est destinée à être calée en rotation sur la lentille optique à usiner, par l'intermédiaire d'un matelas de jonction en métal à bas point de fusion fondu in situ, et, d'autre part, une superstructure, par laquelle elle est apte à être coiffée par un outil d'entraînement, cette pré-molette étant d'une manière générale caractérisée en ce que son embase est périphériquement en retrait vis-à-vis de sa superstructure.More specifically, it firstly relates to a pre-dial for the sliding of an optical lens, of the type comprising, on the one hand, a base, by which it is intended to be locked in rotation on the optical lens to be machined, by means of a metal junction mat with low melting point melted in situ, and, on the other hand, a superstructure, by which it is capable of being capped by a drive tool , this pre-wheel being generally characterized in that its base is peripherally set back with respect to its superstructure.

Grâce à une telle disposition, il est avantageusement possible de permettre au matelas de jonction de former autour de l'embase de la pré-molette une portée propre à l'emprise de l'outil d'entraînement.Thanks to such an arrangement, it is advantageously possible to allow the junction mat to form around the base of the pre-wheel a bearing specific to the grip of the drive tool.

De ce point de vue, la présente invention a encore pour objet un procédé de mise en oeuvre de cette pré-molette, qui est du genre suivant lequel on établit entre cette pré-molette et la lentille optique à équiper, pour son calage en rotation sur celle-ci, un matelas de jonction en métal à bas point de fusion fondu in situ, et qui est d'une manière générale caractérisé en ce qu'il est fait en sorte que ce matelas de jonction enserre périphériquement l'embase de la pré-molette en formant annulairement autour de cette embase une portée propre à l'emprise de l'outil d'entraînement.From this point of view, the present invention also relates to a method of implementing this pre-dial, which is of the type according to which one establishes between this pre-dial and the optical lens to be fitted, for its setting in rotation on this, a metal junction mat with low melting point melted in situ, and which is generally characterized in that it is made so that junction mat peripherally encloses the base of the pre-wheel by annularly forming around this base a bearing specific to the grip of the drive tool.

Ainsi, suivant l'invention, cette emprise est reportée de la pré-molette au matelas de jonction.Thus, according to the invention, this grip is transferred from the pre-dial to the junction mat.

La pré-molette s'en trouve avantageusement ménagée, et, moins sujette à usure, elle peut servir un plus grand nombre de fois sans que les conditions de surfaçage des lentilles optiques successivement traitées s'en trouvent compromises.The pre-wheel is advantageously provided, and, less subject to wear, it can be used a greater number of times without the surfacing conditions of successively treated optical lenses being compromised.

En outre, le fait que, suivant l'invention, le matelas de jonction enrobe l'embase de la pré-molette est avantageusement favorable à un bon ancrage de ce matelas de jonction sur cette pré-molette, et, donc, par le calage en rotation qui en résulte, à un bon maintien de la lentille optique au cours de son surfaçage, au bénéfice, là encore, de la précision de la surface usinée.In addition, the fact that, according to the invention, the junction mattress coats the base of the pre-wheel is advantageously favorable to good anchoring of this junction mattress on this pre-wheel, and therefore by wedging in rotation which results therefrom, to good maintenance of the optical lens during its surfacing, again, to the benefit of the precision of the machined surface.

En effet, cet ancrage peut avantageusement se faire sur la surface latérale de l'embase, qui, d'une part, est, d'une manière générale, plus étendue que sa surface inférieure, et qui, d'autre part, est en tout point à distance plus grande de l'axe de l'ensemble, au bénéfice de l'efficacité en couple des points d'ancrage correspondants.Indeed, this anchoring can advantageously be done on the lateral surface of the base, which, on the one hand, is, in general, more extensive than its lower surface, and which, on the other hand, is in any point at a greater distance from the axis of the assembly, for the benefit of the torque efficiency of the corresponding anchor points.

Pour favoriser cet ancrage, l'embase de la pré-molette suivant l'invention comporte, en creux, sur sa surface latérale, au moins une entaille, et, préférentiellement, plusieurs entailles réparties circulairement.To promote this anchoring, the base of the pre-wheel according to the invention comprises, in the hollow, on its lateral surface, at least one notch, and, preferably, several notches distributed circularly.

Enfin, le fait que, suivant l'invention, le matelas de jonction enserre l'embase de la pré-molette se conjugue avantageusement avec une arrivée périphérique du métal fondu, ce qui épargne avantageusement la zone centrale de la lentille optique traitée, en réduisant les risques d'un développement intempestif de contrainte dans celle-ci.Finally, the fact that, according to the invention, the junction mat encircles the base of the pre-cutter is advantageously combined with a peripheral arrival of the molten metal, which advantageously spares the central area of the treated optical lens, by reducing the risks of an untimely development of constraint in it.

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, avec un arrachement local, une vue de côté d'une lentille optique équipée d'un bloc de préhension mettant en oeuvre une pré-molette suivant l'invention ;
  • la figure 2 est, à échelle différente, une vue en perspective de cette pré-molette ;
  • la figure 3 en est, à échelle supérieure, une vue en coupe axiale, suivant la ligne III-III de la figure 2 ;
  • la figure 4 en est, à l'échelle de la figure 3, une vue de côté, suivant la flèche IV de cette figure 3 ;
  • la figure 5 est une vue en coupe axiale illustrant le procédé de mise en oeuvre de la pré-molette suivant l'invention ;
  • la figure 6 est une vue en coupe axiale analogue à celle de la figure 3, pour une variante de réalisation de cette pré-molette.
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:
  • Figure 1 is, with a local cutaway, a side view of an optical lens equipped with a gripping block implementing a pre-wheel according to the invention;
  • Figure 2 is, on a different scale, a perspective view of this pre-wheel;
  • Figure 3 is a larger scale, an axial sectional view along the line III-III of Figure 2;
  • Figure 4 is, on the scale of Figure 3, a side view, along arrow IV of this Figure 3;
  • Figure 5 is an axial sectional view illustrating the method of implementing the pre-wheel according to the invention;
  • Figure 6 is an axial sectional view similar to that of Figure 3, for an alternative embodiment of this pre-wheel.

Tel qu'illustré, schématiquement, sur la figure 1, il s'agit, globalement, d'assurer le glantage d'une lentille optique 10 à usiner, c'est-à-dire d'équiper cette lentille optique 10 d'un bloc de préhension 11 propre à permettre à un outil d'entraînement 12 de l'appliquer à une meule 13 ou à tout autre outil propre au surfaçage recherché.As illustrated, schematically, in FIG. 1, it is a question, overall, of ensuring the sliding of an optical lens 10 to be machined, that is to say of equipping this optical lens 10 with a gripping block 11 suitable for allowing a drive tool 12 to apply it to a grinding wheel 13 or any other tool suitable for the desired surfacing.

Sur la figure 1, il a été supposé que la face 14 à usiner de la lentille optique 10 en était la face concave, et cela est le cas le plus usuel lorsque cette lentille optique 10 est une lentille ophtalmique.In FIG. 1, it has been assumed that the face 14 to be machined of the optical lens 10 is the concave face, and this is the most usual case when this optical lens 10 is an ophthalmic lens.

L'outil d'entraînement 12 et la meule 13 étant bien connus par eux-mêmes, et ne relevant pas de la présente invention, ils ne seront pas décrits ici.The drive tool 12 and the grinding wheel 13 are well known in themselves, and not falling within the scope of the present invention, they will not be described here.

Il suffira d'indiquer que, au moins à son extrémité, l'outil d'entraînement 12 est en forme de cloche, de manière à pouvoir coiffer le bloc de préhension 11.It will suffice to indicate that, at least at its end, the drive tool 12 is in the shape of a bell, so as to be able to cover the gripping block 11.

De manière également connue en soi, le bloc de préhension 11 met en oeuvre une pré-molette 15, qui, suivant des dispositions décrites plus en détail ultérieurement, comporte, globalement, d'une part, une embase 16, par laquelle elle est destinée à être calée en rotation sur la lentille optique 10 à usiner, par l'intermédiaire d'un matelas de jonction 17 en métal à bas point de fusion fondu in situ, et, d'autre part, une superstructure 18, par laquelle elle est apte à être coiffée par l'outil d'entraînement 12.In a manner also known per se, the gripping block 11 implements a pre-wheel 15, which, according to arrangements described in more detail later, generally comprises, on the one hand, a base 16, by which it is intended to be locked in rotation on the optical lens 10 to be machined, by means of a mattress junction 17 made of metal with a low melting point melted in situ, and, on the other hand, a superstructure 18, by which it is capable of being capped by the drive tool 12.

Globalement, également, la pré-molette 15 est une pièce de révolution, d'axe A schématisé en traits interrompus sur les figures.Overall, also, the pre-wheel 15 is a part of revolution, of axis A shown diagrammatically in broken lines in the figures.

Dans les formes de réalisation représentées, la surface latérale 20 de la superstructure 18 de la pré-molette 15 est globalement tronconique, en allant en convergeant en direction de sa surface supérieure 21.In the embodiments shown, the lateral surface 20 of the superstructure 18 of the pre-wheel 15 is generally frustoconical, going in converging direction of its upper surface 21.

Conjointement, cette surface supérieure 21 est plane, en s'étendant sensiblement perpendiculairement à l'axe A, et la superstructure 18 présente, en creux sur cette surface supérieure 21, d'une part, axialement, un dégagement 23, qui est entièrement circonscrit annulairement par sa périphérie, et, d'autre part, pour coopération avec l'outil d'entraînement 12, une saignée diamétrale 24, qui, recoupant le dégagement 23, se trouve fractionnée en deux tronçons par celui-ci.Jointly, this upper surface 21 is planar, extending substantially perpendicular to the axis A, and the superstructure 18 has, recessed on this upper surface 21, on the one hand, axially, a clearance 23, which is entirely circumscribed annularly by its periphery, and, on the other hand, for cooperation with the drive tool 12, a diametrical groove 24, which, intersecting the clearance 23, is divided into two sections by the latter.

Les dispositions qui précèdent sont bien connues par elles-mêmes, et elles ne seront donc pas décrites plus en détail ici.The foregoing provisions are well known in themselves, and therefore will not be described in more detail here.

Suivant l'invention, l'embase 16 de la pré-molette 15 est périphériquement en retrait vis-à-vis de sa superstructure 18, de manière à permettre au matelas de jonction 17 de former autour d'elle, tel que représenté en trait continu sur la figure 1 et tel que schématisé en traits interrompus sur la figure 3, une portée 25 propre à l'emprise de l'outil d'entraînement 12.According to the invention, the base 16 of the pre-wheel 15 is peripherally set back with respect to its superstructure 18, so as to allow the junction mat 17 to form around it, as shown in line continuous in FIG. 1 and as shown diagrammatically in broken lines in FIG. 3, a bearing surface 25 specific to the grip of the drive tool 12.

En pratique, cette portée 25 est une portée cylindrique de section transversale circulaire centrée sur l'axe A.In practice, this bearing 25 is a cylindrical bearing of circular cross section centered on the axis A.

En pratique, également, la surface latérale 26 de l'embase 16 forme avec la surface latérale 20 de la superstructure 18 une arête 27, et c'est à compter de cette arête 27 que s'étend la portée 25.In practice, too, the lateral surface 26 of the base 16 forms with the lateral surface 20 of the superstructure 18 an edge 27, and it is from this edge 27 that the bearing surface 25 extends.

Dans la forme de réalisation représentée, la surface latérale 26 de l'embase 16 comporte, à compter de l'arête 27, un premier tronçon 26A, qui est globalement tronconique, et qui va en convergeant en direction de sa surface inférieure 28, et un deuxième tronçon 26B, qui est également globalement tronconique, mais qui, au contraire du premier, va en divergeant en direction de la surface inférieure 28.In the embodiment shown, the lateral surface 26 of the base 16 comprises, from the edge 27, a first section 26A, which is generally frustoconical, and which converges towards its lower surface 28, and a second section 26B, which is also generally frustoconical, but which, unlike the first, diverges in the direction of the lower surface 28.

En pratique, dans cette forme de réalisation, la surface latérale 26 de l'embase 16 comporte un troisième tronçon 26C, qui est globalement cylindrique, en s'étendant périphériquement suivant une circonférence de diamètre inférieur à celui de la circonférence suivant laquelle s'étend l'arête 27, et qui, axialement, s'étend jusqu'à la surface inférieure 28.In practice, in this embodiment, the lateral surface 26 of the base 16 comprises a third section 26C, which is generally cylindrical, extending peripherally along a circumference of diameter smaller than that of the circumference which extends the edge 27, and which, axially, extends to the lower surface 28.

Il résulte de la configuration que présente ainsi la surface latérale 26 de l'embase 16 que cette embase 16 est globalement en retrait par rapport à l'arête 27 qu'elle forme avec la superstructure 18, et, donc, par rapport à cette dernière.It follows from the configuration thus presented by the lateral surface 26 of the base 16 that this base 16 is generally set back with respect to the edge 27 which it forms with the superstructure 18, and therefore with respect to the latter .

Pour favoriser l'ancrage du matelas de jonction 17, et, ainsi, son calage en rotation sur la pré-molette 15, l'embase 16 de cette pré-molette 15 comporte, en creux, sur sa surface latérale 26, au moins une entaille 29.To promote the anchoring of the junction mat 17, and thus its setting in rotation on the pre-wheel 15, the base 16 of this pre-wheel 15 has, in the recess, on its lateral surface 26, at least one notch 29.

Préférentiellement, plusieurs entailles 29 sont prévues, en étant convenablement réparties circulairement.Preferably, several notches 29 are provided, being suitably distributed circularly.

Dans la forme de réalisation représentée, ces entailles 29, toutes identiques entre elles, sont au nombre de quatre, et elles sont globalement disposées en croix autour de l'axe A de l'ensemble.In the embodiment shown, these notches 29, all identical to each other, are four in number, and they are generally arranged in a cross around the axis A of the assembly.

Parallèlement à cet axe A, chacune des entailles 29 ne prend naissance qu'à distance de l'arête 27 que l'embase 16 forme avec la superstructure 18 et s'étend au contraire jusqu'à la surface inférieure 28 de cette embase 16, en mordant en croissant sur cette surface inférieure 28.Parallel to this axis A, each of the notches 29 only arises at a distance from the edge 27 that the base 16 forms with the superstructure 18 and, on the contrary, extends to the lower surface 28 of this base 16, while biting in crescent on this lower surface 28.

En pratique, dans la forme de réalisation représentée, chacune des entailles 29 est formée par la conjonction de deux surfaces, à savoir, d'une part, une surface plane 30, qui s'étend sensiblement perpendiculairement à l'axe A, à distance de la surface inférieure 28, et, d'autre part, une surface courbe 31, qui, à compter du contour de la surface plane 30, s'étend globalement en biais par rapport à l'axe A et rejoint la surface inférieure 28.In practice, in the embodiment shown, each of the notches 29 is formed by the conjunction of two surfaces, namely, on the one hand, a flat surface 30, which extends substantially perpendicular to the axis A, at a distance of the lower surface 28, and, on the other hand, a surface curve 31, which, starting from the contour of the planar surface 30, extends generally at an angle relative to the axis A and joins the lower surface 28.

Dans la forme de réalisation plus particulièrement représentée sur les figures 1 à 5, la surface inférieure 28 de l'embase 16 est plate, en s'étendant perpendiculairement à l'axe A.In the embodiment more particularly shown in Figures 1 to 5, the lower surface 28 of the base 16 is flat, extending perpendicular to the axis A.

Conjointement, le dégagement 23 de la superstructure 18 est borgne.Jointly, the clearance 23 of the superstructure 18 is blind.

Autrement dit, ce dégagement 23 est fermé à sa base par un fond 32 plein.In other words, this clearance 23 is closed at its base by a full bottom 32.

Préférentiellement, la pré-molette 15 suivant l'invention comporte un repère d'orientation angulaire 33.Preferably, the pre-wheel 15 according to the invention comprises an angular orientation reference 33.

Dans les formes de réalisation représentées, ce repère d'orientation angulaire 33 est formé par une rainure, qui, affectant, en creux, la surface supérieure 21 de la superstructure 18, est écartée, angulairement, de la saignée diamétrale 24 que présente celle-ci.In the embodiments shown, this angular orientation reference 33 is formed by a groove, which, in hollow, affecting the upper surface 21 of the superstructure 18, is spaced, angularly, from the diametrical groove 24 that this presents this.

Mais, en variante, ou en complément, ce repère d'orientation angulaire 33 peut également être formé par une simple rainure affectant localement la surface inférieure 28 de l'embase 16.However, as a variant, or in addition, this angular orientation mark 33 can also be formed by a simple groove locally affecting the lower surface 28 of the base 16.

Pour la mise en oeuvre de la pré-molette 15 suivant l'invention, il est par exemple procédé comme suit.For the implementation of the pre-wheel 15 according to the invention, it is, for example, as follows.

Tout d'abord, et tel que représenté sur la figure 5, cette pré-molette 15 est engagée par sa superstructure 18 dans un logement 35 prévu en creux à cet effet à la surface d'une forme de calage 36 légèrement inclinée.First of all, and as shown in FIG. 5, this pre-wheel 15 is engaged by its superstructure 18 in a recess 35 provided for this purpose in hollow on the surface of a wedge shape 36 slightly inclined.

Il est rapporté, ensuite, sur cette forme de calage 36, autour de l'embase 16 de la pré-molette 15, une bague 37 présentant annulairement une empreinte 38, qui est à l'image de la configuration recherchée pour le matelas de jonction 17 à former, et qui communique latéralement avec l'extérieur, à sa partie haute, par un trou de coulée 39.It is then reported, on this form of wedging 36, around the base 16 of the pre-wheel 15, a ring 37 annularly having an imprint 38, which is in the image of the configuration sought for the junction mat 17 to be formed, and which communicates laterally with the outside, at its upper part, through a tap hole 39.

En variante, cette bague 37 peut faire partie intégrante de la forme de calage 36.As a variant, this ring 37 can be an integral part of the wedging form 36.

Dans tous les cas, la lentille optique 10 à équiper est ensuite rapportée sur l'ensemble, suivant l'axe A de la pré-molette 15.In all cases, the optical lens 10 to be fitted is then attached to the assembly, along the axis A of the pre-wheel 15.

Bien entendu, des dispositions, qui relèvent de l'homme de l'art, sont corollairement prises pour le maintien convenable des diverses pièces ainsi en cause.Of course, provisions, which fall within the skill of the art, are corollarily taken for the proper maintenance of the various parts thus in question.

Enfin, il est assuré, par le trou de coulée 39, le remplissage de l'empreinte 38 de la bague 37 par du métal à bas point de fusion dûment préalablement fondu.Finally, it is ensured, by the taphole 39, the filling of the imprint 38 of the ring 37 with metal with a low melting point duly previously melted.

Dans la forme de mise en oeuvre représentée, le matelas de jonction 17 obtenu comporte, outre la portée 25, un épaulement 40, qui s'étend perpendiculairement à l'axe A de l'ensemble, et, au-delà de cet épaulement 40, un épanouissement 41 dont la surface latérale 42 est globalement tronconique, en allant en divergeant à compter de l'épaulement 40.In the embodiment shown, the connecting mat 17 obtained comprises, in addition to the bearing surface 25, a shoulder 40, which extends perpendicular to the axis A of the assembly, and, beyond this shoulder 40 , a blooming 41 whose lateral surface 42 is generally frustoconical, going diverging from the shoulder 40.

Quoi qu'il en soit, il est fait en sorte, suivant l'invention, que le matelas de jonction 17 ainsi établi entre la pré-molette 15 et la lentille optique 10 à équiper enserre périphériquement, en l'enrobant, l'embase 16 de la pré-molette 15, en formant annulairement autour de cette embase 16 la portée 25 propre à l'emprise de l'outil d'entraînement 12.Anyway, it is ensured, according to the invention, that the junction mat 17 thus established between the pre-wheel 15 and the optical lens 10 to be fitted surrounds peripherally, by coating it, the base 16 of the pre-wheel 15, by annularly forming around this base 16 the bearing surface 25 specific to the grip of the drive tool 12.

Conjointement, il est préférentiellement fait en sorte que, parallèlement à l'axe A de l'ensemble, cette portée 25 s'étende immédiatement à compter de la superstructure 18 de la pré-molette 15, à ras avec celle-ci.Jointly, it is preferably made so that, parallel to the axis A of the assembly, this bearing surface 25 extends immediately from the superstructure 18 of the pre-wheel 15, flush with it.

Autrement dit, il est préférentiellement fait en sorte que la portée 25 s'étende jusqu'à l'arête 27 que l'embase 16 forme avec la superstructure 18, en étant ainsi en quelque sorte en continuité avec cette dernière.In other words, it is preferably made so that the surface 25 extends to the edge 27 that the base 16 forms with the superstructure 18, thus being in a way in continuity with the latter.

Dans la variante de réalisation représentée sur la figure 6, l'embase 16 de la pré-molette 15 présente, en creux, sur sa surface inférieure 28, un dégagement 43, qui est entièrement circonscrit annulairement par sa périphérie, et qui est borgne.In the variant embodiment shown in FIG. 6, the base 16 of the pre-wheel 15 has, in the hollow, on its lower surface 28, a clearance 43, which is entirely circumscribed annularly by its periphery, and which is blind.

Dans le cas où la cambrure de la lentille optique 10 à traiter est accentuée, il en résulte avantageusement, à quantité égale de métal mise en oeuvre, un certain gain de place.In the case where the camber of the optical lens 10 to be treated is accentuated, this advantageously results in: equal amount of metal used, a certain space saving.

Bien entendu, la présente invention ne se limite pas aux formes de réalisation décrites et représentées, mais englobe toute variante d'exécution, notamment en ce qui concerne le nombre et/ou la configuration des entailles préférentiellement prévues sur la surface latérale de l'embase de la pré-molette.Of course, the present invention is not limited to the embodiments described and shown, but encompasses any variant, in particular as regards the number and / or the configuration of the notches preferably provided on the lateral surface of the base. of the pre-wheel.

Claims (14)

Pré-molette pour le glantage d'une lentille optique, du genre comportant, d'une part, une embase (16), par laquelle elle est destinée à être calée en rotation sur la lentille optique (10) à usiner, par l'intermédiaire d'un matelas de jonction (17) en métal à bas point de fusion fondu in situ, et, d'autre part, une superstructure (18), par laquelle elle est apte à être coiffée par un outil d'entraînement (12), caractérisée en ce que l'embase (16) est périphériquement en retrait vis-à-vis de la superstructure (18).Pre-wheel for gliding an optical lens, of the type comprising, on the one hand, a base (16), by which it is intended to be locked in rotation on the optical lens (10) to be machined, by the intermediate a junction mat (17) made of metal with a low melting point melted in situ, and, on the other hand, a superstructure (18), by which it is capable of being capped by a drive tool (12 ), characterized in that the base (16) is peripherally set back with respect to the superstructure (18). Pré-molette suivant la revendication 1, caractérisée en ce que, formant une arête (27) avec la surface latérale (20) de la superstructure (18), la surface latérale (26) de l'embase (16) comporte, à compter de cette arête (27), un premier tronçon (26A), qui est globalement tronconique, et qui va en convergeant en direction de sa surface inférieure (28), et un deuxième tronçon (26B), qui est également globalement tronconique, mais qui, au contraire du premier, va en divergeant en direction de ladite surface inférieure (28).Pre-wheel according to claim 1, characterized in that, forming an edge (27) with the lateral surface (20) of the superstructure (18), the lateral surface (26) of the base (16) comprises, from from this edge (27), a first section (26A), which is generally frustoconical, and which converges towards its lower surface (28), and a second section (26B), which is also generally frustoconical, but which , unlike the first, diverges in the direction of said lower surface (28). Pré-molette suivant la revendication 2, caractérisée en ce que la surface latérale (26) de l'embase (16) comporte un troisième tronçon (26C), qui, globalement cylindrique, s'étend jusqu'à sa surface inférieure (28).Pre-wheel according to claim 2, characterized in that the lateral surface (26) of the base (16) comprises a third section (26C), which, generally cylindrical, extends to its lower surface (28) . Pré-molette suivant l'une quelconque des revendications 1 à 3, caractérisée en ce que l'embase (16) comporte, en creux, sur sa surface latérale (26), au moins une entaille (29).Pre-wheel according to any one of claims 1 to 3, characterized in that the base (16) has, recessed, on its lateral surface (26), at least one notch (29). Pré-molette suivant les revendications 2 et 4, prises conjointement, caractérisée en ce que parallèlement à l'axe (A) de l'ensemble, l'entaille (29) ne prend naissance qu'à distance de l'arête (27) que l'embase (16) forme avec la superstructure (18).Pre-wheel according to claims 2 and 4, taken together, characterized in that parallel to the axis (A) of the assembly, the notch (29) only begins at a distance from the edge (27) that the base (16) forms with the superstructure (18). Pré-molette suivant l'une quelconque des revendications 4, 5, caractérisée en ce que, parallèlement à l'axe (A) de l'ensemble, l'entaille (29) s'étend jusqu'à la surface inférieure (28) de l'embase (16), en mordant sur cette surface inférieure (28).Pre-wheel according to any one of claims 4, 5, characterized in that, parallel to the axis (A) of the assembly, the notch (29) extends to the lower surface (28) of the base (16), biting on this lower surface (28). Pré-molette suivant l'une quelconque des revendications 4 à 6, caractérisée en ce que l'embase (16) comporte plusieurs entailles (29) réparties circulairement.Pre-wheel according to any one of claims 4 to 6, characterized in that the base (16) comprises several notches (29) distributed circularly. Pré-molette suivant l'une quelconque des revendications 1 à 7, caractérisée en ce que la surface inférieure (28) de l'embase (16) est plate.Pre-wheel according to any one of claims 1 to 7, characterized in that the lower surface (28) of the base (16) is flat. Pré-molette suivant l'une quelconque des revendications 1 à 7, caractérisée en ce que, l'embase (16) présentant en creux sur sa surface inférieure (28) un dégagement (43) entièrement circonscrit annulairement par sa périphérie, ce dégagement (43) est borgne.Pre-wheel according to any one of claims 1 to 7, characterized in that, the base (16) having recessed on its lower surface (28) a clearance (43) entirely circumscribed annularly by its periphery, this clearance ( 43) is blind. Pré-molette suivant l'une quelconque des revendications 1 à 9, caractérisée en ce que, la superstructure (18) présentant en creux sur sa surface supérieure (21) un dégagement (23) entièrement circonscrit annulairement par sa périphérie, ce dégagement (23) est borgne.Pre-wheel according to any one of claims 1 to 9, characterized in that, the superstructure (18) having recessed on its upper surface (21) a clearance (23) entirely circumscribed annularly by its periphery, this clearance (23 ) is blind. Pré-molette suivant l'une quelconque des revendications 1 à 10, caractérisée en ce qu'elle comporte un repère d'orientation angulaire (33).Pre-dial according to any one of claims 1 to 10, characterized in that it includes an angular orientation mark (33). Pré-molette suivant la revendication 11, caractérisée en ce que, la superstructure (18) présentant en creux sur sa surface supérieure (21) une saignée diamétrale (24), le repère d'orientation angulaire (33) est formé par une rainure écartée angulairement de cette saignée diamétrale (24).Pre-wheel according to claim 11, characterized in that, the superstructure (18) having a hollow on its upper surface (21) a diametrical groove (24), the angular orientation mark (33) is formed by a spaced groove angularly of this diametral groove (24). Procédé pour la mise en oeuvre d'une pré-molette conforme à l'une quelconque des revendications 1 à 12, du genre suivant lequel on établit entre cette pré-molette (15) et la lentille optique (10) à équiper, pour son calage en rotation sur celle-ci, un matelas de jonction (17) en métal à bas point de fusion fondu in situ, caractérisé en ce qu'il est fait en sorte que ce matelas de jonction (17) enserre périphériquement l'embase (16) de la pré-molette (15) en formant annulairement autour de cette embase (16) une portée (25) propre à l'emprise d'un outil d'entraînement (12).Process for the implementation of a pre-wheel according to any one of claims 1 to 12, of the type according to which one establishes between this pre-wheel (15) and the optical lens (10) to be fitted, for its setting in rotation thereon, a junction mat (17) made of metal with a low melting point melted in situ, characterized in that it is made so that this junction mat (17) peripherally encloses the base ( 16) of the pre-wheel (15) by annularly forming around this base (16) a bearing surface (25) suitable for the grip of a drive tool (12). Procédé suivant la revendication 13, caractérisé en ce qu'il est fait en sorte que, parallèlement à l'axe (A) de l'ensemble, la portée (25) du matelas de jonction (17) s'étende immédiatement à compter de la superstructure (18) de la pré-molette (15), à ras avec celle-ci.Method according to claim 13, characterized in that it is arranged so that, parallel to the axis (A) of the assembly, the bearing surface (25) of the junction mat (17) extends immediately from the superstructure (18) of the pre-wheel (15), flush with it.
EP96400919A 1995-05-03 1996-04-29 Blocking tool for machining optical lenses and the process for using it Expired - Lifetime EP0740979B1 (en)

Applications Claiming Priority (2)

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FR9505278 1995-05-03
FR9505278A FR2733710B1 (en) 1995-05-03 1995-05-03 PRE-KNOB FOR GLANTAGE OF AN OPTICAL LENS, AND METHOD FOR IMPLEMENTING SAME

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EP0740979B1 EP0740979B1 (en) 1999-09-08

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EP (1) EP0740979B1 (en)
AT (1) ATE184229T1 (en)
CA (1) CA2175645A1 (en)
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US5669807A (en) 1997-09-23
DE69604116D1 (en) 1999-10-14
DE69604116T2 (en) 2000-03-09
ES2135855T3 (en) 1999-11-01
CA2175645A1 (en) 1996-11-04
FR2733710B1 (en) 1997-07-18
ATE184229T1 (en) 1999-09-15
EP0740979B1 (en) 1999-09-08
FR2733710A1 (en) 1996-11-08

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