WO2000000324A1 - Abrader device - Google Patents

Abrader device Download PDF

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Publication number
WO2000000324A1
WO2000000324A1 PCT/FR1999/001546 FR9901546W WO0000324A1 WO 2000000324 A1 WO2000000324 A1 WO 2000000324A1 FR 9901546 W FR9901546 W FR 9901546W WO 0000324 A1 WO0000324 A1 WO 0000324A1
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WO
WIPO (PCT)
Prior art keywords
membrane
blades
polishing
curvature
displacement
Prior art date
Application number
PCT/FR1999/001546
Other languages
French (fr)
Inventor
Pierre Delamare
Original Assignee
Delamare Sovra
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Delamare Sovra filed Critical Delamare Sovra
Publication of WO2000000324A1 publication Critical patent/WO2000000324A1/en

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Classifications

    • 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
    • B24B13/02—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made

Definitions

  • the subject of the present invention is a pusher device, in particular optical surfaces such as spectacle lenses, of the type comprising a membrane and a support, a method of manufacturing said membrane and a polishing installation using such devices.
  • the final step consists in polishing the spherical, aspherical or toric surfaces of the spectacle lenses in order to give them the appropriate optical properties.
  • the final polishing operation is obtained by carrying out a complex relative movement between the optical glass to be polished and a sheet of a polishing material or pusher whose texture is adapted to the operation to be performed.
  • the pusher devices had to both carry out the polishing operation while rectifying the imperfections of the glass surface beforehand. draft.
  • the pusher devices had to have a very rigid polishing surface with a curvature perfectly identical to the desired curvature of the glass in order to compensate for the lack of precision of the machines intended for roughing operations.
  • pusher devices In known manner, current machines used for the roughing operation achieve perfect curvatures which are identical to the desired curvatures of the glass to be polished.
  • the polishing surfaces of the pusher devices no longer ensuring the rectification of the curvature of the glass but simply its polishing, we have seen pusher devices appear whose polishing surface can conform to the surface of the previously roughed glass.
  • These devices generally comprise an elastic membrane having a polishing surface with a substantially circular contour which is extended by a bellows-shaped rim, which is fixed to a rigid support. The membrane and the support thus delimit a cavity which is filled with a plastically deformable mass which can be made incompressible by temporary stiffening means which form on command a flexible or rigid support layer for the membrane.
  • the mass When the mass is in the flexible state, it suffices applying the optical surface of the lens glass to be polished on the polishing surface of said membrane so that the bellows-shaped rim forces with force said plastically deformable mass which in turn presses the polishing surface against the optical surface glass to polish Then, the means of ⁇ gifidication cause the stiffening of the mass to temporarily maintain it in the form which has been imparted to it
  • the polishing surface of the membrane is generally larger than that of the optical surface to be polished
  • the temporary stiffening means are activated to temporarily maintain the incompressible deformable mass
  • the useful surface of the polishing surface in its peripheral region that is to say in its region external to that which was pressed in contact with the optical surface, does not conform to the desired geometry
  • the surfacing being produced by a complex relative displacement of the polishing surface of the membrane with respect to the optical surface of the spectacle lens, this results in usu re non-uniform of the polished surface of the glass
  • the present invention aims to remedy this drawback by providing a polishing device, in particular sphe ⁇ ques, asphe ⁇ ques or toric optical surfaces including all of the useful surface of the polishing surface of the membrane can be shaped to the optical surface to
  • the polishing device in particular of optical surfaces such as spectacle lenses, comprises a support and a membrane having an apex and a peripheral rim secured to said support, and to the external face of which may be subjected to a surfacing material, characterized in that the membrane consists of an elastome ⁇ que material in which are embedded two elastically deformable crossed blades, the ends of the regularly spaced blades each being extended at the peripheral edge of the membrane by a means for securing said membrane to the support and in that the support comprises displacement means for causing the displacement of the securing means in the direction of the blade to which they are connected, by which the radii of curvature of the curbs are modified blades
  • the membrane at rest, has a circular peripheral rim defined by an axis of revolution passing through the top of said membrane and in that the two elastically deformable blades cross at the level of said axis of revolution
  • the device further comprises guide means for holding the top of the
  • the two blades are fixed to each other at their intersection zone. According to yet another advantageous characteristic, the blades are arranged at right angles.
  • At least two reinforcing blades of identical length to the blades provided with securing means are embedded in the membrane, each reinforcing blade being arranged at regular intervals between said blades provided with securing means
  • the displacement means independently cause the displacement of each securing means
  • the displacement means simultaneously cause the displacement of the means for securing the two ends of each blade
  • the displacement means simultaneously cause the displacement of each securing means
  • the support also comprises additional means for simultaneously moving in a vertical direction the means for securing the two ends of the same blade in order to compensate for the deformation of the peripheral edge of the membrane
  • each securing means is constituted by an insert partially embedded in the peripheral rim of the membrane, said insert being provided on its upper part with a notch so as to accommodate one of the ends of a blade and on its lower part of a tapped bore intended to cooperate with the means of displacement of the support
  • a second object of the present invention is to provide a method of manufacturing the membrane, the two radii of curvature of which vary between a minimum radius of curvature and a maximum radius of curvature, characterized in that it comprises the following steps the blades are placed in a mold by applying a prestress corresponding to the minimum radius of curvature,
  • an elastomeric material is injected into the mold in which said blades are embedded and the inserts partially embedded, and
  • Another object of the invention is to provide a polishing installation using a plurality of polishing devices of the type defined above and which make it possible to optimize the polishing of spectacle lenses or the like, these glasses having a wide variety of shapes and radii of curvature
  • the polishing installation is characterized in that it comprises
  • each machine being capable of receiving a polishing device and of driving it in movement
  • each adjustment station capable of receiving a polishing device, each adjustment station being connected to at least one polishing machine by means of a transfer means, and in that each adjustment station comprises drive members for causing the displacement of the displacement means of the polishing device, and
  • control assembly for controlling the drive members as a function of the shape which it is desired to give to the membrane of said polisher device
  • each adjustment station is also connected by means of a transfer means to means for replacing said polishing device with at least one other device whose radii of curvature of the blades at rest are different.
  • control assembly comprises - means for receiving information on the shape which it is desired to give to the membrane of the polishing device, and means for converting said shape information into control information for the replacement means and for the drive members of the adjustment station
  • each adjustment station further comprises means for taking images to obtain information on the effective shape of the membrane and the programmed shape of the membrane.
  • FIG. 1 is a view in vertical section of a polishing device according to the invention
  • FIG. 2 is a view in vertical section along line II-II of FIG. 1 of the polisher device according to the invention
  • FIG. 3 is a top view of an embodiment of the elastomeric membrane
  • FIG. 4 is a view in vertical section of the membrane in a state corresponding to the minimum radius of curvature
  • FIG. 5 is a view in vertical section along the line V-V of FIG. 3 of the membrane in a state corresponding to the maximum radius of curvature
  • FIG. 6 is a top view of the support
  • FIG. 7 is a schematic overview of a polishing installation
  • - Figure 8 is a diagram of an adjustment station
  • - Figure 9 is a vertical sectional view of an alternative embodiment of the polisher device.
  • the polisher device mainly comprises a support 1 and a membrane 2 secured by its peripheral edge 3 of the support 1
  • This membrane at rest, that is to say when it is not mounted on the support 1, has a vertex and a circular peripheral rim 3 of axis of revolution C passing through said apex, and two external faces 21 and internal 22.
  • the membrane 2 is made of an elastomeric material in which are embedded two elastically deformable blades 4 and 5 .
  • blades 4 and 5 elastically deformable are preferably made with a material such as spring steel and have a reduced thickness preferably between 1 and 4 tenths of a millimeter
  • the thickness of the layer of elastomeric material located above the blades 4 and 5 is between 1 and 5 millimeters
  • the ends of these blades 4 and 5 are located substantially at the level of the internal wall of the circular peripheral rim 3 and are regularly spaced such that said blades 4 and 5 are arranged at right angles.
  • Each of the two ends of the blades 4 and 5 is extended by an insert 6 disposed substantially vertically in the peripheral rim 3 of the membrane 2, said insert 6 being partially embedded in the peripheral rim 3.
  • Each insert 6 is provided on its upper part with a notch 61 so as to accommodate one of the ends of the blades 4 and 5 and its lower part is provided with a tapped bore 62 intended to cooperate with displacement means of the support 1, as will be described in detail later.
  • each insert 6 can be likened to a means for securing the membrane 2 to the support 1
  • the elastically deformable blades 4 and 5 intersect at the level of the axis of revolution C of the circular peripheral edge 3.
  • these blades 4 and 5 are fixed to each other, for example by a welding point at said axis of revolution
  • the membrane 2 has been shown in the rest position.
  • the blades 4 and 5 have a maximum radius of curvature corresponding to the greatest distance between the two ends of a same blade and, in this case, the pressure exerted by said ends on each insert 6 is also minimal.
  • the coefficient of elasticity of the elastomeric material being greater than that of the blades 4 and 5, these then inflict on the elastomeric material their respective radius of curvature which can vary from a maximum radius of curvature to a minimum radius of curvature.
  • the membrane 2 described above is produced in the following manner
  • the blades 4 and 5 initially flat are placed in a mold by applying a prestressing close to their elastic limit corresponding to the minimum radius of curvature, then there is an insert 6 at each of the two ends of said blades 4 and 5
  • the elastomeric material such as silicone, in which said blades 4 and 5 are embedded and the inserts 6 partially embedded, is injected into the mold.
  • the configuration of the membrane 2 is as shown in FIG. 4, that is to say that the assembly formed by the elastomeric material and the blades 4 and 5 is in a prestressed position.
  • the glass surfaces may have a wide range of radii of curvature, it is understood that if it is desired to completely cover this range, the radii of curvature of the blades 4 and 5 will have to vary up to a certain minimum radius of curvature likely to be locate above the elastic limit of said blades
  • the polishing device in which the membrane 2 is secured by its peripheral edge 3 to the support 1, or more precisely the membrane 2 is made integral with the support by the fastening means that constitute the inserts 6 located in the extension of the ends of the blades 4 and 5
  • the support 1 mainly consists of a base 8 of circular outline provided with a diametrical groove 81 in which a plate 9 slides vertically (FIG. 6)
  • the support 1 comprises displacement means for causing the displacement of the inserts 6 in the direction of the blade to which they are connected
  • the radius of curvature of each blade is modified at will, which can vary from a maximum radius of curvature to a minimum radius of curvature and vice versa
  • These displacement means comprise for each insert 6, a rod 10, a first threaded end of which cooperates with the threaded bore 62 produced in each insert 6, the other end of the rod 10 being connected to a bevel gear 1 1 coupled to a rotary motor M housed in a through recess 82 located on the underside of the base 8
  • Each motor M is arranged on the frame of an adjustment station B of the polishing installation ( Figures 7 and 8) which will be described later
  • each motor M is provided with a splined shaft 13 intended to drive in rotation a female shaft 12 connected to a bevel gear 1 1 and the internal wall of which is also splined.
  • the motors M which are arranged on the frame of the adjustment station B drive in rotation, via the angular gear 1 1, the threaded rods 10 which cause the displacement of the inserts 6 and therefore consequently modify the radii of curvature of the blades 4 and 5
  • the device according to the invention also provides means for simultaneously moving in a vertical direction the inserts 6 from the two ends of the blade 4
  • This rotary motor 19 is provided with a splined shaft 14 intended to drive in rotation a female shaft 15 connected to the underside of the plate 9
  • the female shaft 15 is provided with a grooved inner wall and a threaded outer wall
  • Each of the two ends of the plate 9 also has a through hole 16 allowing the passage of the female shafts 12 of the bevel gears 1 1 whose threaded rods 10 cause the ends of the blade 4 to move.
  • the polishing installation shown in Figures 7 and 8 comprises a plurality of machines polishing A] A n on which the polishing device already described can be mounted
  • This installation also includes the adjustment station B on which the four motors M and the motor 19 are arranged, which make it possible to adjust the radii of curvature of the blades 4 and 5 and therefore the shape of the polishing surface of the membrane 2
  • Each polishing machine Ai consists essentially a motor capable of causing a complex relative displacement of the polishing surface of a membrane with respect to the optical surface of the glass.
  • the entire installation is controlled by a control unit which allows an operator to enter the shape of the desired polishing surface for a polishing device to be adjusted and which automatically sends the instructions to the adjustment station. suitable for obtaining the polishing surface programmed by the operator.
  • the control assembly comprises a processing unit 42 constituted for example from a microprocessor. It also includes a keyboard 41 for entering the parameters of the surface to be produced into the processing unit 42 and a display device 44.
  • the keyboard 41 could be replaced by any other means of data acquisition.
  • the processing unit 42 is coupled to a program memory 43.
  • the memory 43 contains in particular correspondence tables between the parameters of each surface which can be adjusted and the corresponding displacements which must be applied to the inserts 6 situated in the extension of the ends of the blades 4 and 5 of a membrane, as well as the type of membrane to use
  • the processing unit 42 is capable of sending commands to a station 49 comprising for example three polishing devices, each device comprising a membrane having predetermined and different maximum radii of curvature.
  • a station 49 comprising for example three polishing devices, each device comprising a membrane having predetermined and different maximum radii of curvature.
  • the processing unit 42 sends displacement commands which must be executed towards the control circuit 46 of the adjustment station B.
  • This control circuit 46 independently controls each motor M as well as the motor 19, which allows the individual displacement of each insert 6, corresponding to the instructions issued by the processing unit.
  • the adjustment station B is equipped with at least one camera 47 making it possible to measure, by image capture, the shape actually taken by the polishing surface of the membrane after its adjustment.
  • the information transmitted by the camera is received by the processing unit 42 via a circuit of 45 conversion of images into digital data This information is compared to that which was initially introduced into the processing unit In the event that the image collected by the camera does not conform to the shape of the programmed surface, the processing unit then sends error correction instructions to the control circuit 46 of the adjustment station
  • the base 8 of the support 1 is provided with a dovetail system 17 by which the polishing apparatus Ai transmits a complex relative movement between the polishing surface of the membrane 2 and the optical surface of the glass
  • the adjustment station B is provided on its upper face with two recesses 48 intended to house the system at the tail of 'dovetail 17
  • a sheet of a polishing material may be fixed on the external surface 21 of the membrane. It is also possible to provide for this polishing installation to comprise a plurality of adjustment stations. , each adjustment station being connected to several polishing apparatuses by transfer means In this case, the processing unit will issue on its outputs the displacement commands which will have to be executed towards the control circuits of the adjustment stations
  • the inserts 6 situated in the extension of the ends of the same blade can be connected to the same rotary motor, this time comprising two threaded rods
  • the polishing surface of the membrane will be of shape toric or sphe ⁇ que
  • the inserts 6 located in the extension of the ends of the blades 4 and 5 can be connected to a single rotary motor or any other means.
  • the polishing surface of the membrane will be sphe ⁇ que or asphe ⁇ que
  • the latter comprises guide means for holding the top of the membrane 2 in the direction of 1 axis of revolution C
  • These means consist, on the one hand, of a rod 23 fixed by one of its ends to the internal face of the blade 4, for example by welding, and which is arranged along the axis of revolution C of the peripheral rim 3 , and secondly, by a member 24 fixed at its base on the plate 9 and which is provided on its upper face with a blind bore 25 intended to receive the rod 23 in axial sliding.
  • the assembly formed by the rod 23 and the member 24 allows movement of the top of the membrane 2 in the direction of the axis of revolution C while preventing movement of the latter in a horizontal plane.
  • provision may also be made to fix the rod 23 on the internal face 22 of the membrane 2, for example using an adhesive material, or else, according to yet another alternative, provision may also be made to directly fix the base of the member 24 on the internal face of the blade 4 and the rod 23 on the plate 9.

Abstract

The invention concerns an abrader device in particular for optical surfaces such as spectacle lenses comprising a support (1) and a membrane (2) with a top and a peripheral rim (3) integral with the support, and on the outer surface of which a surface grinding material can be fixed. The invention is characterised in that the membrane (2) consists of an elastomeric material wherein are embedded two crossed blades (4, 5) capable of elastic deformation, the uniformly spaced blade ends being each extended at the membrane (2) peripheral rim (3) by means interlocking said membrane with the support and the support includes driving means for moving the interlocking means along a direction of the blade whereto they are linked, thereby modifying in controlled manner and independently each blade (4, 5) radius of curvature.

Description

Dispositif de Poussoir Pusher Device
La présente invention a pour objet un dispositif de poussoir, notamment de surfaces optiques telles que des verres de lunettes, du type comprenant une membrane et un support, un procédé de fabrication de ladite membrane et une installation de polissage utilisant de tels dispositifs.The subject of the present invention is a pusher device, in particular optical surfaces such as spectacle lenses, of the type comprising a membrane and a support, a method of manufacturing said membrane and a polishing installation using such devices.
Il est bien connu que, lors de la fabrication de verre de lunettes, l'étape finale consiste dans le polissage des surfaces sphériques, asphériques ou toriques des verres de lunettes afin de leur conférer les propriétés optiques convenables. L'opération finale de polissage est obtenue en réalisant un mouvement relatif complexe entre le verre optique à polir et une feuille d'un matériau de polissage ou poussoir dont la texture est adaptée à l'opération à réaliser.It is well known that, during the manufacture of spectacle lenses, the final step consists in polishing the spherical, aspherical or toric surfaces of the spectacle lenses in order to give them the appropriate optical properties. The final polishing operation is obtained by carrying out a complex relative movement between the optical glass to be polished and a sheet of a polishing material or pusher whose texture is adapted to the operation to be performed.
Préalablement à l'étape finale consistant dans le polissage des surfaces optiques des verres de lunettes, une opération d'ébauchage du verre est nécessaire afin de lui conférer une première courbure.Prior to the final step consisting in polishing the optical surfaces of the spectacle lenses, a roughing operation of the lens is necessary in order to give it a first curvature.
Dans le passé, les machines appropriées pour effectuer les opérations d'ébauchage n'étaient pas suffisamment précises, ce qui impliquait que les dispositifs de poussoir devaient à la fois effectuer l'opération de polissage tout en rectifiant les imperfections de la surface du verre préalablement ébauché. Ainsi, les dispositifs de poussoir devaient avoir une surface de polissage très rigide avec une courbure parfaitement identique à la courbure souhaitée du verre afin de compenser le manque de précision des machines destinées aux opérations d'ébauchage.In the past, the machines suitable for carrying out the roughing operations were not sufficiently precise, which implied that the pusher devices had to both carry out the polishing operation while rectifying the imperfections of the glass surface beforehand. draft. Thus, the pusher devices had to have a very rigid polishing surface with a curvature perfectly identical to the desired curvature of the glass in order to compensate for the lack of precision of the machines intended for roughing operations.
De manière connue, les machines actuelles servant à l'opération d'ébauchage réalisent des courbures parfaites et identiques aux courbures souhaitées du verre à polir. Ainsi les surfaces de polissage des dispositifs de poussoir n'assurant plus la rectification de la courbure du verre mais simplement son polissage, on a vu apparaître des dispositifs de poussoir dont la surface de polissage peut se conformer à la surface du verre préalablement ébauché. Ces dispositifs comprennent généralement une membrane élastique présentant une surface de polissage de contour sensiblement circulaire qui se prolonge par un rebord en forme de soufflet, lequel est fixé à un support rigide. La membrane et le support délimitent ainsi une cavité que l'on remplie d'une masse plastiquement déformable qui peut être rendue incompressible par des moyens de rigidification temporaire qui forment sur commande une couche d'appui souple ou rigide pour la membrane. Lorsque la masse se trouve à l'état souple, il suffit d'appliquer la surface optique du verre de lunette a polir sur la surface de polissage de ladite membrane de sorte que le rebord en forme de soufflet sollicite avec des forces ladite masse plastiquement déformable qui presse a son tour la surface de polissage contre la surface optique du verre a polir Ensuite, les moyens de πgifidication provoquent la rigidification de la masse pour la maintenir temporairement dans la forme qui lui a ete impartieIn known manner, current machines used for the roughing operation achieve perfect curvatures which are identical to the desired curvatures of the glass to be polished. Thus, the polishing surfaces of the pusher devices no longer ensuring the rectification of the curvature of the glass but simply its polishing, we have seen pusher devices appear whose polishing surface can conform to the surface of the previously roughed glass. These devices generally comprise an elastic membrane having a polishing surface with a substantially circular contour which is extended by a bellows-shaped rim, which is fixed to a rigid support. The membrane and the support thus delimit a cavity which is filled with a plastically deformable mass which can be made incompressible by temporary stiffening means which form on command a flexible or rigid support layer for the membrane. When the mass is in the flexible state, it suffices applying the optical surface of the lens glass to be polished on the polishing surface of said membrane so that the bellows-shaped rim forces with force said plastically deformable mass which in turn presses the polishing surface against the optical surface glass to polish Then, the means of πgifidication cause the stiffening of the mass to temporarily maintain it in the form which has been imparted to it
Pendant les opérations de polissage, il est souhaitable que la surface de polissage de la membrane reste en permanence uniformément en contact avec la totalité de la surface optique a traiter Pour cette raison, la surface de polissage de la membrane est en gênerai plus grande que celle de la surface optique a polir Toutefois, quand la membrane et la surface optique sont appliquées l'une contre l'autre pour conformer la surface de polissage et quand on active les moyens de rigidification temporaire pour maintenir temporairement la masse déformable incompressible, on constate que la surface utile de la surface de polissage dans sa région périphérique, c'est a dire dans sa région extérieure a celle qui a ete pressée au contact de la surface optique, n'est pas conforme a la géométrie souhaitée Le surfaçage étant réalise par un déplacement relatif complexe de la surface de polissage de la membrane par rapport a la surface optique du verre de lunette, il en resuite une usure non uniforme de la surface polie du verre La présente invention a pour but de remédier a cet inconvénient en fournissant un dispositif de polissoir, notamment de surfaces optiques spheπques, aspheπques ou toriques dont la totalité de la surface utile de la surface de polissage de la membrane peut être conformée a la surface optique a polirDuring the polishing operations, it is desirable for the polishing surface of the membrane to remain permanently uniformly in contact with the entire optical surface to be treated. For this reason, the polishing surface of the membrane is generally larger than that of the optical surface to be polished However, when the membrane and the optical surface are applied against each other to conform the polishing surface and when the temporary stiffening means are activated to temporarily maintain the incompressible deformable mass, it is found that the useful surface of the polishing surface in its peripheral region, that is to say in its region external to that which was pressed in contact with the optical surface, does not conform to the desired geometry The surfacing being produced by a complex relative displacement of the polishing surface of the membrane with respect to the optical surface of the spectacle lens, this results in usu re non-uniform of the polished surface of the glass The present invention aims to remedy this drawback by providing a polishing device, in particular spheπques, aspheπques or toric optical surfaces including all of the useful surface of the polishing surface of the membrane can be shaped to the optical surface to be polished
Pour atteindre ce but, selon l'invention, le dispositif de polisson, notamment de surfaces optiques telles que des verres de lunettes, comprend un support et une membrane présentant un sommet et un rebord périphérique solidaire dudit support, et a la face externe de laquelle peut être assujetti un matériau de surfaçage, caractérise en ce que la membrane est constituée d'un matériau elastomeπque dans lequel sont noyées deux lames croisées élastiquement déformables, les extrémités des lames régulièrement espacées étant chacune prolongées au niveau du rebord périphérique de la membrane par un moyen de solidarisation de ladite membrane au support et en ce que le support comprend des moyens de déplacement pour provoquer le déplacement des moyens de solidarisation suivant la direction de la lame a laquelle ils sont relies par quoi on modifie de façon contrôlée les rayons de courbure des lames Selon une autre caractéristique, la membrane, au repos, présente un rebord périphérique circulaire défini par un axe de révolution passant par le sommet de ladite membrane et en ce que les deux lames élastiquement déformables se croisent au niveau dudit axe de révolution Selon une autre caractéristique, le dispositif comprend en outre des moyens de guidage pour maintenir le sommet de la membrane suivant la direction de l'axe de révolutionTo achieve this object, according to the invention, the polishing device, in particular of optical surfaces such as spectacle lenses, comprises a support and a membrane having an apex and a peripheral rim secured to said support, and to the external face of which may be subjected to a surfacing material, characterized in that the membrane consists of an elastomeπque material in which are embedded two elastically deformable crossed blades, the ends of the regularly spaced blades each being extended at the peripheral edge of the membrane by a means for securing said membrane to the support and in that the support comprises displacement means for causing the displacement of the securing means in the direction of the blade to which they are connected, by which the radii of curvature of the curbs are modified blades According to another characteristic, the membrane, at rest, has a circular peripheral rim defined by an axis of revolution passing through the top of said membrane and in that the two elastically deformable blades cross at the level of said axis of revolution According to another characteristic , the device further comprises guide means for holding the top of the membrane in the direction of the axis of revolution
Selon encore une autre caractéristique, les deux lames sont fixées l'une a l'autre au niveau de leur zone d'intersection Selon encore une autre caractéristique avantageuse, les lames sont disposées a angles droitsAccording to yet another characteristic, the two blades are fixed to each other at their intersection zone. According to yet another advantageous characteristic, the blades are arranged at right angles.
Selon une autre caractéristique, au moins deux lames de renforcement de longueur identique aux lames munies de moyens de solidarisation sont noyées dans la membrane, chaque lame de renforcement étant disposée a intervalle régulier entre lesdites lames munies de moyen de solidarisationAccording to another characteristic, at least two reinforcing blades of identical length to the blades provided with securing means are embedded in the membrane, each reinforcing blade being arranged at regular intervals between said blades provided with securing means
Selon un premier mode de réalisation, les moyens de déplacement provoquent indépendamment le déplacement de chaque moyen de solidarisationAccording to a first embodiment, the displacement means independently cause the displacement of each securing means
Selon un second mode de réalisation, les moyens de déplacement provoquent simultanément le déplacement des moyens de solidarisation des deux extrémités de chaque lameAccording to a second embodiment, the displacement means simultaneously cause the displacement of the means for securing the two ends of each blade
Selon un troisième mode de réalisation, les moyens de déplacement provoquent simultanément le déplacement de chaque moyen de solidarisationAccording to a third embodiment, the displacement means simultaneously cause the displacement of each securing means
Selon une autre caractéristique, le support comprend en outre des moyens additionnels pour déplacer simultanément dans une direction verticale les moyens de solidarisation des deux extrémités d'une même lame afin de compenser la déformation du rebord périphérique de la membraneAccording to another characteristic, the support also comprises additional means for simultaneously moving in a vertical direction the means for securing the two ends of the same blade in order to compensate for the deformation of the peripheral edge of the membrane
Selon encore une autre caractéristique, chaque moyen de solidarisation est constitue par un insert partiellement noyé dans le rebord périphérique de la membrane, ledit insert étant pourvu sur sa partie supérieure d'une encoche de façon a loger l'une des extrémités d'une lame et sur sa partie inférieure d'un alésage taraude destine a coopérer avec les moyens de déplacement du supportAccording to yet another characteristic, each securing means is constituted by an insert partially embedded in the peripheral rim of the membrane, said insert being provided on its upper part with a notch so as to accommodate one of the ends of a blade and on its lower part of a tapped bore intended to cooperate with the means of displacement of the support
Un second objet de la présente invention est de fournir un procède de fabrication de la membrane dont les deux rayons de courbure varient entre un rayon de courbure minimum et un rayon de courbure maximum, caractérise en ce qu'il comprend les étapes suivantes - on dispose les lames dans un moule en leur appliquant une précontrainte correspondant au rayon de courbure minimum,A second object of the present invention is to provide a method of manufacturing the membrane, the two radii of curvature of which vary between a minimum radius of curvature and a maximum radius of curvature, characterized in that it comprises the following steps the blades are placed in a mold by applying a prestress corresponding to the minimum radius of curvature,
- on dispose un insert a chacune des deux extrémités desdites lames,- there is an insert at each of the two ends of said blades,
- on injecte dans le moule un matériau elastomenque dans lequel lesdites lames sont noyées et les inserts partiellement noyés, etan elastomeric material is injected into the mold in which said blades are embedded and the inserts partially embedded, and
- on démoule et on laisse l'ensemble ainsi obtenu atteindre un état d'équilibre dans lequel les deux rayons de courbure ont un rayon de courbure maximum- we unmold and let the assembly thus obtained reach a state of equilibrium in which the two radii of curvature have a maximum radius of curvature
On comprend qu'ainsi, en provoquant le déplacement des moyens de solidarisation, on peut modifier de façon simple le rayon de courbure de chaque lame et donc par voie de conséquence, il est possible de conformer la totalité de la surface utile de la membrane a la surface optique a traiterIt is understood that thus, by causing the displacement of the securing means, it is possible to modify in a simple manner the radius of curvature of each blade and therefore consequently, it is possible to conform the entire useful surface of the membrane to the optical surface to be treated
Un autre objet de l'invention est de fournir une installation de polissage utilisant une pluralité de dispositifs de polissoir du type défini précédemment et qui permettent d'optimiser le polissage de verres de lunettes ou analogues, ces verres présentant une grande diversité de formes et de rayons de courbureAnother object of the invention is to provide a polishing installation using a plurality of polishing devices of the type defined above and which make it possible to optimize the polishing of spectacle lenses or the like, these glasses having a wide variety of shapes and radii of curvature
Pour atteindre ce but, l'installation de polissage se caractérise en ce qu'elle comprendTo achieve this goal, the polishing installation is characterized in that it comprises
- une pluralité de machines de polissage, chaque machine étant apte a recevoir un dispositif de polissoir et a l'entraîner en mouvement,a plurality of polishing machines, each machine being capable of receiving a polishing device and of driving it in movement,
- une pluralité de postes de réglage aptes a recevoir chacun un dispositif de polissoir, chaque poste de réglage étant relie a au moins une machine de polissage par l'intermédiaire d'un moyen de transfert, et en ce que chaque poste de réglage comprend des organes moteurs pour provoquer le déplacement des moyens de déplacement du dispositif de polissoir, eta plurality of adjustment stations each capable of receiving a polishing device, each adjustment station being connected to at least one polishing machine by means of a transfer means, and in that each adjustment station comprises drive members for causing the displacement of the displacement means of the polishing device, and
- un ensemble de commande pour commander les organes moteurs en fonction de la forme que l'on veut donner a la membrane dudit dispositif de polissoir- a control assembly for controlling the drive members as a function of the shape which it is desired to give to the membrane of said polisher device
Selon une autre caractéristique , chaque poste de réglage est en outre relie par l'intermédiaire d'un moyen de transfert a des moyens de remplacement dudit dispositif de polissoir par au moins un autre dispositif dont les rayons de courbure des lames au repos sont différentsAccording to another characteristic, each adjustment station is also connected by means of a transfer means to means for replacing said polishing device with at least one other device whose radii of curvature of the blades at rest are different.
Selon encore une autre caractéristique, l'ensemble de commande comprend - des moyens pour recevoir des informations sur la forme que l'on veut donner a la membrane du dispositif de polissoir, et - des moyens pour convertir lesdites informations de forme en des informations de commande pour les moyens de remplacement et pour les organes moteurs du poste de réglageAccording to yet another characteristic, the control assembly comprises - means for receiving information on the shape which it is desired to give to the membrane of the polishing device, and means for converting said shape information into control information for the replacement means and for the drive members of the adjustment station
Selon une autre caractéristique avantageuse, chaque poste de réglage comprend de plus des moyens de prise d'images pour obtenir des informations sur la forme effective de la membrane et la forme programmée de la membrane.According to another advantageous characteristic, each adjustment station further comprises means for taking images to obtain information on the effective shape of the membrane and the programmed shape of the membrane.
D'autres caractéristiques et avantages de la présente invention apparaîtront mieux à la lecture de la description qui va suivre accompagnée des dessins annexés sur lesquels - la figure 1 est une vue en coupe verticale d'un dispositif de polissoir selon l'invention,Other characteristics and advantages of the present invention will appear better on reading the description which follows, accompanied by the appended drawings in which - FIG. 1 is a view in vertical section of a polishing device according to the invention,
- la figure 2 est une vue en coupe verticale selon la ligne II-II de la figure 1 du dispositif de polissoir selon l'invention,FIG. 2 is a view in vertical section along line II-II of FIG. 1 of the polisher device according to the invention,
- la figure 3 est une vue de dessus d'un mode de réalisation de la membrane élastomérique,FIG. 3 is a top view of an embodiment of the elastomeric membrane,
- la figure 4 est une vue en coupe verticale de la membrane dans un état correspondant au rayon de courbure minimum,FIG. 4 is a view in vertical section of the membrane in a state corresponding to the minimum radius of curvature,
- la figure 5 est une vue en coupe verticale selon la ligne V-V de la figure 3 de la membrane dans un état correspondant au rayon de courbure maximum,FIG. 5 is a view in vertical section along the line V-V of FIG. 3 of the membrane in a state corresponding to the maximum radius of curvature,
- la figure 6 est une vue de dessus du support,FIG. 6 is a top view of the support,
- la figure 7 est une vue schématique d'ensemble d'une installation de polissage,FIG. 7 is a schematic overview of a polishing installation,
- la figure 8 est un schéma d'un poste de réglage, et - la figure 9 est une vue en coupe verticale d'une variante de réalisation du dispositif de polissoir.- Figure 8 is a diagram of an adjustment station, and - Figure 9 is a vertical sectional view of an alternative embodiment of the polisher device.
Comme on peut le voir sur la figure 1, le dispositif de polissoir selon l'invention comprend principalement un support 1 et une membrane 2 solidaire par son rebord périphérique 3 du support 1 Avant toute description du dispositif en lui-même, on va tout d'abord décrire un mode de réalisation de la membrane 2 en se référant aux figures 1 et 3. Cette membrane 2, au repos, c'est-à-dire lorsqu'elle n'est pas montée sur le support 1, présente un sommet et un rebord périphérique 3 circulaire d'axe de révolution C passant par ledit sommet, et deux faces externe 21 et interne 22. Par ailleurs, la membrane 2 est constituée d'un matériau élastomérique dans lequel sont noyées deux lames 4 et 5 élastiquement déformables. Ces lames 4 et 5 élastiquement déformables sont réalisées de préférence avec un matériau tel que de l'acier à ressort et ont une épaisseur réduite de préférence comprise entre 1 et 4 dixièmes de millimètre En outre, l'épaisseur de la couche de matériau élastomérique située au-dessus des lames 4 et 5 est comprise entre 1 à 5 millimètresAs can be seen in Figure 1, the polisher device according to the invention mainly comprises a support 1 and a membrane 2 secured by its peripheral edge 3 of the support 1 Before any description of the device itself, we will all 'first describe an embodiment of the membrane 2 with reference to Figures 1 and 3. This membrane 2, at rest, that is to say when it is not mounted on the support 1, has a vertex and a circular peripheral rim 3 of axis of revolution C passing through said apex, and two external faces 21 and internal 22. Furthermore, the membrane 2 is made of an elastomeric material in which are embedded two elastically deformable blades 4 and 5 . These blades 4 and 5 elastically deformable are preferably made with a material such as spring steel and have a reduced thickness preferably between 1 and 4 tenths of a millimeter In addition, the thickness of the layer of elastomeric material located above the blades 4 and 5 is between 1 and 5 millimeters
Les extrémités de ces lames 4 et 5 se situent sensiblement au niveau de la paroi interne du rebord périphérique 3 circulaire et sont régulièrement espacées de telle manière que lesdites lames 4 et 5 soient disposées à angles droits.The ends of these blades 4 and 5 are located substantially at the level of the internal wall of the circular peripheral rim 3 and are regularly spaced such that said blades 4 and 5 are arranged at right angles.
Chacune des deux extrémités des lames 4 et 5 est prolongée par un insert 6 disposé sensiblement à la verticale dans le rebord périphérique 3 de la membrane 2, ledit insert 6 étant partiellement noyé dans le rebord périphérique 3.Each of the two ends of the blades 4 and 5 is extended by an insert 6 disposed substantially vertically in the peripheral rim 3 of the membrane 2, said insert 6 being partially embedded in the peripheral rim 3.
Chaque insert 6 est pourvu sur sa partie supérieure d'une encoche 61 de façon à loger l'une des extrémités des lames 4 et 5 et sa partie inférieure est pourvue d'un alésage taraudé 62 destiné à coopérer avec des moyens de déplace- ment du support 1, comme cela sera décrit en détail ultérieurement. Ainsi, chaque insert 6 peut être assimilé à un moyen de solidarisation de la membrane 2 au support 1Each insert 6 is provided on its upper part with a notch 61 so as to accommodate one of the ends of the blades 4 and 5 and its lower part is provided with a tapped bore 62 intended to cooperate with displacement means of the support 1, as will be described in detail later. Thus, each insert 6 can be likened to a means for securing the membrane 2 to the support 1
En outre, lorsque la membrane 2 est en position de repos, les lames 4 et 5 élastiquement déformables se croisent au niveau de l'axe de révolution C du rebord périphérique 3 circulaire Avantageusement, ces lames 4 et 5 sont fixées entre elles, par exemple par un point de soudage au niveau dudit axe de révolutionIn addition, when the membrane 2 is in the rest position, the elastically deformable blades 4 and 5 intersect at the level of the axis of revolution C of the circular peripheral edge 3. Advantageously, these blades 4 and 5 are fixed to each other, for example by a welding point at said axis of revolution
CVS
On pourra également prévoir de diminuer localement l'épaisseur des lames 4 et 5 au niveau de l'axe de révolution C ou bien sur certains tronçons de leur longueur afin de leur conférer certaines propriétés élastiquesIt is also possible to provide for locally reducing the thickness of the blades 4 and 5 at the level of the axis of revolution C or else on certain sections of their length in order to give them certain elastic properties.
Selon le matériau élastomérique utilisé pour réaliser la membrane 2, on pourra également prévoir de noyer aux moins deux lames de renforcement 7, lesquelles seront disposées à intervalles réguliers entre lesdites lames 4 et 5Depending on the elastomeric material used to make the membrane 2, provision may also be made to drown at least two reinforcing blades 7, which will be arranged at regular intervals between said blades 4 and 5
Ces lames de renforcement 7 de longueur identique aux lames 4 et 5 auront pour rôle de rigidifier ou de renforcer les secteurs angulaires formés par les lames 4 et 5 afin de conserver et de mieux définir la courbure globale de la membrane 2These reinforcing blades 7 of identical length to the blades 4 and 5 will have the role of stiffening or strengthening the angular sectors formed by the blades 4 and 5 in order to conserve and better define the overall curvature of the membrane 2
Comme on peut le voir sur la figure 5, on a représenté la membrane 2 en position de repos Dans cette position, les lames 4 et 5 ont un rayon de coubure maximum correspondant à la plus grande distance entre les deux extrémités d'une même lame et, dans ce cas, la pression exercée par lesdites extrémités sur chaque insert 6 est également minimale.As can be seen in FIG. 5, the membrane 2 has been shown in the rest position. In this position, the blades 4 and 5 have a maximum radius of curvature corresponding to the greatest distance between the two ends of a same blade and, in this case, the pressure exerted by said ends on each insert 6 is also minimal.
Lorsque l'on tend à diminuer la distance entre les deux extrémités d'une même lame, comme on peut le voir sur la figure 4, alors la pression exercée par chaque insert 6 sur les extrémités d'une même lame tend à courber cette dernièreWhen one tends to decrease the distance between the two ends of the same blade, as can be seen in FIG. 4, then the pressure exerted by each insert 6 on the ends of the same blade tends to bend the latter
Le coefficient d'élasticité du matériau élastomérique étant supérieur à celui des lames 4 et 5, celles-ci infligent alors au matériau élastomérique leur rayon de courbure respectif qui peut varier d'un rayon de courbure maximum à un rayon de courbure minimum La fabrication de la membrane 2 décrite ci-dessus est réalisée de la manière suivanteThe coefficient of elasticity of the elastomeric material being greater than that of the blades 4 and 5, these then inflict on the elastomeric material their respective radius of curvature which can vary from a maximum radius of curvature to a minimum radius of curvature. the membrane 2 described above is produced in the following manner
Tout d'abord, on dispose les lames 4 et 5 initialement plates dans un moule en leur appliquant une précontrainte proche de leur limite d'élasticité correspondant au rayon de courbure minimum, puis on dispose un insert 6 à chacune des deux extrémités desdites lames 4 et 5 On procède ensuite à l'injection dans le moule du matériau élastomérique, tel que du silicone dans lequel lesdites lames 4 et 5 sont noyées et les inserts 6 partiellement noyésFirst, the blades 4 and 5 initially flat are placed in a mold by applying a prestressing close to their elastic limit corresponding to the minimum radius of curvature, then there is an insert 6 at each of the two ends of said blades 4 and 5 Next, the elastomeric material, such as silicone, in which said blades 4 and 5 are embedded and the inserts 6 partially embedded, is injected into the mold.
A ce moment de la fabrication, la configuration de la membrane 2 est telle que représentée sur la figure 4, c'est-à-dire que l'ensemble formé par le matériau élastomérique et les lames 4 et 5 est dans une position de précontrainte maximumAt this time of manufacture, the configuration of the membrane 2 is as shown in FIG. 4, that is to say that the assembly formed by the elastomeric material and the blades 4 and 5 is in a prestressed position. maximum
Ensuite, on sort ladite membrane 2 du moule, les lames 4 et 5 ayant un coefficient d'élasticité inférieur a celui du matériau élastomérique tendent à retrouver leur état initial et de ce fait l'ensemble ainsi obtenu atteint un état d'équilibre correspondant au cas où la membrane possède deux rayons de courbure identiques et maximumsThen, said membrane 2 is removed from the mold, the blades 4 and 5 having a lower coefficient of elasticity than that of the elastomeric material tend to return to their initial state and therefore the assembly thus obtained reaches a state of equilibrium corresponding to the case where the membrane has two identical and maximum radii of curvature
Les surfaces de verres pouvant présenter une large gamme de rayons de courbure, on comprend que si l'on désire couvrir entièrement cette gamme, les rayons de courbure des lames 4 et 5 devront varier jusqu'à un certain rayon de courbure minimale susceptible de se situer au-dessus de la limite d'élasticité desdites lamesAs the glass surfaces may have a wide range of radii of curvature, it is understood that if it is desired to completely cover this range, the radii of curvature of the blades 4 and 5 will have to vary up to a certain minimum radius of curvature likely to be locate above the elastic limit of said blades
Afin d'éviter toute déformation irréversible des lames, on peut par exemple réaliser trois membranes distinctes dont les rayons de courbure maximums au repos seront différents Ainsi, au lieu de disposer dans le moule des lames 4 et 5 initialement plates, il suffira de les courber préalablement afin de réaliser une membrane dont les rayons de courbure maximums au repos seront inférieurs aux rayons de courbure maximums de la membrane fabriquée à partir de lames initialement platesIn order to avoid any irreversible deformation of the blades, it is possible, for example, to produce three separate membranes whose maximum radii of curvature at rest will be different. Thus, instead of having blades 4 and 5 initially flat in the mold, it will suffice to bend them. beforehand in order to produce a membrane whose maximum radii of curvature at rest will be less than maximum radii of curvature of the membrane made from initially flat blades
On se réfère maintenant au dispositif de polissoir, dans lequel la membrane 2 est solidaire par son rebord périphérique 3 du support 1, ou plus exactement la membrane 2 est rendue solidaire du support par les moyens de solidarisation que constituent les inserts 6 situés dans le prolongement des extrémités des lames 4 et 5We now refer to the polishing device, in which the membrane 2 is secured by its peripheral edge 3 to the support 1, or more precisely the membrane 2 is made integral with the support by the fastening means that constitute the inserts 6 located in the extension of the ends of the blades 4 and 5
Le support 1 est principalement constitué d'un socle 8 de contour circulaire pourvu d'une rainure diamétrale 81 dans laquelle coulisse verticalement une plaque 9 (figure 6)The support 1 mainly consists of a base 8 of circular outline provided with a diametrical groove 81 in which a plate 9 slides vertically (FIG. 6)
Le support 1 comprend des moyens de déplacement pour provoquer le déplacement des inserts 6 suivant la direction de la lame à laquelle ils sont reliésThe support 1 comprises displacement means for causing the displacement of the inserts 6 in the direction of the blade to which they are connected
Ainsi, en agissant sur les inserts 6, on modifie à volonté le rayon de courbure de chaque lame qui peut varier d'un rayon de courbure maximal à un rayon de courbure minimal et vice versaThus, by acting on the inserts 6, the radius of curvature of each blade is modified at will, which can vary from a maximum radius of curvature to a minimum radius of curvature and vice versa
Ces moyens de déplacement comprennent pour chaque insert 6, une tige 10 dont une première extrémité filetée coopère avec l'alésage taraudé 62 réalisé dans chaque insert 6, l'autre extrémité de la tige 10 étant reliée à un renvoi d'angle 1 1 couplé à un moteur rotatif M logé dans un évidement débouchant 82 situé sur la face inférieure du socle 8 Chaque moteur M est disposé sur le bâti d'un poste de réglage B de l'installation de polissage (figures 7 et 8) qui sera décrit ultérieurementThese displacement means comprise for each insert 6, a rod 10, a first threaded end of which cooperates with the threaded bore 62 produced in each insert 6, the other end of the rod 10 being connected to a bevel gear 1 1 coupled to a rotary motor M housed in a through recess 82 located on the underside of the base 8 Each motor M is arranged on the frame of an adjustment station B of the polishing installation (Figures 7 and 8) which will be described later
En outre, chaque moteur M est pourvu d'un arbre cannelé 13 destiné à entraîner en rotation un arbre femelle 12 relié à un renvoi d'angle 1 1 et dont la paroi interne est également cannelée Ainsi, les moteurs M qui sont disposé sur le bâti du poste de réglage B entraînent en rotation, par l'intermédiaire des renvois d'angle 1 1, les tiges filetées 10 qui provoquent le déplacement des inserts 6 et donc par voie de conséquence modifient les rayons de courbure des lames 4 et 5In addition, each motor M is provided with a splined shaft 13 intended to drive in rotation a female shaft 12 connected to a bevel gear 1 1 and the internal wall of which is also splined. Thus, the motors M which are arranged on the frame of the adjustment station B drive in rotation, via the angular gear 1 1, the threaded rods 10 which cause the displacement of the inserts 6 and therefore consequently modify the radii of curvature of the blades 4 and 5
On comprend que si l'on désire obtenir une surface de polissage torique, c'est-à-dire ayant deux rayons de courbure différents suivant deux diamètres perpendiculaires, les lames 4 et 5 devront être conformées de manière à définir ces deux rayons de courbure Ainsi, étant donné que les lames 4 et 5 sont fixées entre elles au niveau de leur point d'intersection, il s'ensuit que, si leur rayon de courbure respectif est différent et si leurs extrémités respectives sont contenues dans un même plan, cela entraînera une déformation de la courbure globale de la face externe 21 de la membrane 2, d'où l'apparition de plis sur ladite surface externe 21It is understood that if it is desired to obtain a toric polishing surface, that is to say having two different radii of curvature along two perpendicular diameters, the blades 4 and 5 must be shaped so as to define these two radii of curvature Thus, since the blades 4 and 5 are fixed to each other at their point of intersection, it follows that, if their respective radius of curvature is different and if their respective ends are contained in the same plane, this will cause a deformation of the overall curvature of the outer face 21 of the membrane 2, hence the appearance of folds on said outer surface 21
Afin d'éviter l'apparition de plis sur la membrane 2, le dispositif selon l'invention fournit également des moyens pour déplacer simultanément dans une direction verticale les inserts 6 des deux extrémités de la lame 4In order to avoid the appearance of folds on the membrane 2, the device according to the invention also provides means for simultaneously moving in a vertical direction the inserts 6 from the two ends of the blade 4
Ces moyens sont constitués, comme on peut le voir sur les figures 1 et 2, par la plaque 9 qui supporte les deux renvois d'angle 11 provoquant le déplacement des inserts 6 des deux extrémités de la lame 4 et qui coulisse verticalement dans la rainure diamétrale 81 du socle 8 sur lequel sont disposés les deux renvois d'angle 1 1 provoquant le déplacement des inserts 6 des deux extrémités de la lame 5 Le socle 8 de forme circulaire est pourvu sur sa face inférieure d'un évidement central débouchant 83 Cet évidement central 83 communique avec un alésage taraudé 84 qui lui-même communique avec la rainure diamétrale 81 Un moteur rotatif 19 également disposé sur le bâti du poste de réglageThese means are constituted, as can be seen in Figures 1 and 2, by the plate 9 which supports the two bevel gears 11 causing the displacement of the inserts 6 of the two ends of the blade 4 and which slides vertically in the groove diametral 81 of the base 8 on which are arranged the two bevel gear 1 1 causing the displacement of the inserts 6 of the two ends of the blade 5 The base 8 of circular shape is provided on its underside with a central recess opening 83 This central recess 83 communicates with a threaded bore 84 which itself communicates with the diametrical groove 81 A rotary motor 19 also disposed on the frame of the adjustment station
B est logé dans l'évidement central 83 du socle Ce moteur rotatif 19 est pourvu d'un arbre cannelé 14 destiné à entraîner en rotation un arbre femelle 15 relié à la face inférieure de la plaque 9 L'arbre femelle 15 est pourvu d'une paroi interne cannelée et d'une paroi externe filetée Ainsi, lorsque le moteur 19 entraîne en rotation l'arbre femelle 15, celui-ci coopère avec l'alésage taraudé 84, ce qui permet de déplacer verticalement la plaque 9 tout en conservant la liaison entre l'arbre 14 du moteur 19 et l'arbre femelle 15B is housed in the central recess 83 of the base This rotary motor 19 is provided with a splined shaft 14 intended to drive in rotation a female shaft 15 connected to the underside of the plate 9 The female shaft 15 is provided with a grooved inner wall and a threaded outer wall Thus, when the motor 19 rotates the female shaft 15, the latter cooperates with the threaded bore 84, which makes it possible to vertically move the plate 9 while retaining the connection between the shaft 14 of the motor 19 and the female shaft 15
Chacune des deux extrémités de la plaque 9 comporte également un orifice traversant 16 permettant le passage des arbres femelles 12 des renvois d'angle 1 1 dont les tiges filetées 10 provoquent le déplacement des extrémités de la lame 4Each of the two ends of the plate 9 also has a through hole 16 allowing the passage of the female shafts 12 of the bevel gears 1 1 whose threaded rods 10 cause the ends of the blade 4 to move.
En se référant maintenant aux figures 7 et 8, on va décrire l'installation de polissage utilisant le dispositif de polissoir décrit en liaison avec les figures 1 à 6 L'installation de polissage représentée sur les figures 7 et 8 comprend une pluralité de machines de polissage A] An sur lesquelles on peut monter le dispositif de polissoir déjà décrit Cette installation comprend également le poste de réglage B sur lequel sont disposés les quatre moteurs M et le moteur 19 qui permettent de régler les rayons de courbure des lames 4 et 5 et donc la forme de la surface de polissage de la membrane 2 Chaque machine de polissage Ai consiste essentiellement en un moteur pouvant entraîner un déplacement relatif complexe de la surface de polissage d'une membrane par rapport à la surface optique du verre.Referring now to Figures 7 and 8, we will describe the polishing installation using the polishing device described in connection with Figures 1 to 6 The polishing installation shown in Figures 7 and 8 comprises a plurality of machines polishing A] A n on which the polishing device already described can be mounted This installation also includes the adjustment station B on which the four motors M and the motor 19 are arranged, which make it possible to adjust the radii of curvature of the blades 4 and 5 and therefore the shape of the polishing surface of the membrane 2 Each polishing machine Ai consists essentially a motor capable of causing a complex relative displacement of the polishing surface of a membrane with respect to the optical surface of the glass.
L'ensemble de l'installation est contrôlé par un ensemble de commande qui permet à un opérateur d'entrer la forme de la surface de polissage souhaitée pour un dispositif de polissage à régler et qui permet d'envoyer automatiquement au poste de réglage les instructions convenables pour obtenir la surface de polissage programmée par l'opérateur.The entire installation is controlled by a control unit which allows an operator to enter the shape of the desired polishing surface for a polishing device to be adjusted and which automatically sends the instructions to the adjustment station. suitable for obtaining the polishing surface programmed by the operator.
L'ensemble de commande comprend une unité de traitement 42 constituée par exemple à partir d'un microprocesseur. Il comprend également un clavier 41 pour introduire dans l'unité de traitement 42 les paramètres de la surface à réaliser et un dispositif de visualisation 44.The control assembly comprises a processing unit 42 constituted for example from a microprocessor. It also includes a keyboard 41 for entering the parameters of the surface to be produced into the processing unit 42 and a display device 44.
Le clavier 41 pourrait être remplacé par tout autre moyen d'acquisition de données. L'unité de traitement 42 est couplée à une mémoire de programme 43.The keyboard 41 could be replaced by any other means of data acquisition. The processing unit 42 is coupled to a program memory 43.
La mémoire 43 contient en particulier des tables de correspondance entre les paramètres de chaque surface qui peut être réglée et les déplacements correspondants qui doivent être appliqués aux inserts 6 situés dans le prolongement des extrémités des lames 4 et 5 d'une membrane, ainsi que le type de membrane à utiliserThe memory 43 contains in particular correspondence tables between the parameters of each surface which can be adjusted and the corresponding displacements which must be applied to the inserts 6 situated in the extension of the ends of the blades 4 and 5 of a membrane, as well as the type of membrane to use
Grâce à ces tables, l'unité de traitement 42 est susceptible d'envoyer des commandes à un poste 49 comportant par exemple trois dispositifs de polissoir, chaque dispositif comprenant une membrane ayant des rayons de courbures maximums prédéterminés et différents. Ainsi suivant les paramètres introduits par l'opérateur, un des trois dispositifs de polissoir disposés sur le posteThanks to these tables, the processing unit 42 is capable of sending commands to a station 49 comprising for example three polishing devices, each device comprising a membrane having predetermined and different maximum radii of curvature. Thus, depending on the parameters entered by the operator, one of the three polishing devices placed on the station
49 est susceptible de remplacer le dispositif de polissoir déjà installé sur le poste de réglage B. Ce remplacement d'un dispositif par un autre se fera par exemple à l'aide d'un moyen de transfert représenté en traits pointillés sur la figure 7.49 is capable of replacing the polishing device already installed on the adjustment station B. This replacement of one device by another will be done, for example, using a transfer means shown in dotted lines in FIG. 7.
Dès lors, l'unité de traitement 42 envoie des commandes de déplacement qui doivent être exécutées vers le circuit de commande 46 du poste de réglage B. Ce circuit de commande 46, dans ce mode de réalisation, commande indépendamment chaque moteur M ainsi que le moteur 19, ce qui permet le déplacement individuel de chaque insert 6, correspondant aux instructions émises par l'unité de traitement.Consequently, the processing unit 42 sends displacement commands which must be executed towards the control circuit 46 of the adjustment station B. This control circuit 46, in this embodiment, independently controls each motor M as well as the motor 19, which allows the individual displacement of each insert 6, corresponding to the instructions issued by the processing unit.
De plus le poste de réglage B est équipé d'au moins une caméra 47 permettant de mesurer, par prise images, la forme prise effectivement par la surface de polissage de la membrane après son réglage. Les informations émises par la caméra sont reçues par l'unité de traitement 42 par l'intermédiaire d'un circuit de conversion 45 des images en données numériques Ces informations sont comparées a celles qui ont ete initialement introduites dans l'unité de traitement Dans le cas ou l'image recueillie par la caméra n'est pas conforme a la forme de la surface programmée, l'unité de traitement envoie alors vers le circuit de commande 46 du poste de réglage des instructions de corrections d'erreursIn addition, the adjustment station B is equipped with at least one camera 47 making it possible to measure, by image capture, the shape actually taken by the polishing surface of the membrane after its adjustment. The information transmitted by the camera is received by the processing unit 42 via a circuit of 45 conversion of images into digital data This information is compared to that which was initially introduced into the processing unit In the event that the image collected by the camera does not conform to the shape of the programmed surface, the processing unit then sends error correction instructions to the control circuit 46 of the adjustment station
Ainsi, lorsque la surface de polissage de la membrane 2 est obtenue, il suffit de séparer le dispositif de polissoir forme par la membrane 2 et le support 1 des moteurs M et du moteur 19 du poste de réglage B et de venir placer ce dispositif sur l'un des appareils de polissage Ai a l'aide également d'un moyen de transfert, de telle manière que l'ensemble de l'installation de polissage soit entièrement automatiseThus, when the polishing surface of the membrane 2 is obtained, it suffices to separate the polishing device formed by the membrane 2 and the support 1 of the motors M and of the motor 19 of the adjustment station B and to place this device on one of the polishing apparatuses Ai also using transfer means, so that the entire polishing installation is fully automated
De manière connue, le socle 8 du support 1 est muni d'un système en queue d'aronde 17 par lequel l'appareil de polissage Ai transmet un mouvement relatif complexe entre la surface de polissage de la membrane 2 et la surface optique du verre a polir De même, afin de recevoir le dispositif de polissoir dans une position adéquate pour le réglage de la courbure de la membrane 2, le poste de réglage B est pourvu sur sa face supérieure de deux evidements 48 destines a loger le système en queue d'aronde 17In known manner, the base 8 of the support 1 is provided with a dovetail system 17 by which the polishing apparatus Ai transmits a complex relative movement between the polishing surface of the membrane 2 and the optical surface of the glass Likewise, in order to receive the polishing device in a position suitable for adjusting the curvature of the membrane 2, the adjustment station B is provided on its upper face with two recesses 48 intended to house the system at the tail of 'dovetail 17
Bien entendu, une feuille d'un matériau de polissoir dont la texture est adaptée a l'opération a réaliser peut-être fixée sur la surface externe 21 de la membrane On peut également prévoir que cette installation de polissage comprenne une pluralité de postes de réglage, chaque poste de réglage étant relie a plusieurs appareils de polissage par des moyens de transfert Dans ce cas, l'umte de traitement émettra sur ses sorties les commandes de déplacement qui devront être exécutées vers les circuits de commande des postes de réglageOf course, a sheet of a polishing material, the texture of which is adapted to the operation to be carried out, may be fixed on the external surface 21 of the membrane. It is also possible to provide for this polishing installation to comprise a plurality of adjustment stations. , each adjustment station being connected to several polishing apparatuses by transfer means In this case, the processing unit will issue on its outputs the displacement commands which will have to be executed towards the control circuits of the adjustment stations
Selon un second mode de réalisation, les inserts 6 situes dans le prolongement des extrémités d'une même lame pourront être relies a un même moteur rotatif comportant cette fois-ci deux tiges filetées Dans ce cas la surface de polissage de la membrane sera de forme torique ou spheπque Selon un troisième mode de réalisation, les inserts 6 situes dans le prolongement des extrémités des lames 4 et 5 pourront être relies a moteur rotatif unique ou tout autre moyen Dans ce cas la surface de polissage de la membrane sera de forme spheπque ou aspheπqueAccording to a second embodiment, the inserts 6 situated in the extension of the ends of the same blade can be connected to the same rotary motor, this time comprising two threaded rods In this case the polishing surface of the membrane will be of shape toric or spheπque According to a third embodiment, the inserts 6 located in the extension of the ends of the blades 4 and 5 can be connected to a single rotary motor or any other means. In this case, the polishing surface of the membrane will be spheπque or aspheπque
Selon une variante de réalisation du dispositif de polissoir représentée sur la figure 9, ce dernier comprend des moyens de guidage pour maintenir le sommet de la membrane 2 suivant la direction de 1 axe de révolution C Ces moyens sont constitués, d'une part par une tige 23 fixée par l'une de ses extrémités sur la face interne de la lame 4, par exemple par soudage, et qui est disposée suivant l'axe de révolution C du rebord périphérique 3, et d'autre part, par un organe 24 fixé à sa base sur la plaque 9 et qui est pourvu sur sa face supérieure d'un alésage borgne 25 destiné à recevoir la tige 23 en coulissement axial.According to an alternative embodiment of the polisher device shown in Figure 9, the latter comprises guide means for holding the top of the membrane 2 in the direction of 1 axis of revolution C These means consist, on the one hand, of a rod 23 fixed by one of its ends to the internal face of the blade 4, for example by welding, and which is arranged along the axis of revolution C of the peripheral rim 3 , and secondly, by a member 24 fixed at its base on the plate 9 and which is provided on its upper face with a blind bore 25 intended to receive the rod 23 in axial sliding.
Ainsi, l'ensemble formé par la tige 23 et l'organe 24 permet un déplacement du sommet de la membrane 2 suivant la direction de l'axe de révolution C tout en empêchant un déplacement de ce dernier dans un plan horizontal.Thus, the assembly formed by the rod 23 and the member 24 allows movement of the top of the membrane 2 in the direction of the axis of revolution C while preventing movement of the latter in a horizontal plane.
Selon une autre variante de réalisation, on pourra également prévoir de fixer la tige 23 sur la face interne 22 de la membrane 2 par exemple à l'aide d'un matériau adhésif, ou bien alors , selon encore une autre variante on pourra également prévoir de fixer directement la base de l'organe 24 sur la face interne de la lame 4 et la tige 23 sur la plaque 9. According to another alternative embodiment, provision may also be made to fix the rod 23 on the internal face 22 of the membrane 2, for example using an adhesive material, or else, according to yet another alternative, provision may also be made to directly fix the base of the member 24 on the internal face of the blade 4 and the rod 23 on the plate 9.

Claims

REVENDICATIONS
1. Dispositif de polissoir notamment de surfaces optiques telles que des verres de lunettes comprenant un support (1) et une membrane (2) présentant un sommet et un rebord périphérique (3) solidaire du support, et à la face externe de laquelle peut être assujetti un matériau de surfaçage, caractérisé en ce que la membrane (2) est constituée d'un matériau élastomérique dans lequel sont noyées deux lames (4,5) croisées élastiquement déformables, les extrémités des lames régulièrement espacées étant chacune prolongées au niveau du rebord périphérique (3) de la membrane (2) par un moyen de solidarisation de ladite membrane au support et en ce que le support comprend des moyens de déplacement pour provoquer le déplacement des moyens de solidarisation suivant la direction de la lame à laquelle ils sont reliés par quoi on modifie de façon contrôlée les rayons de courbure des lames(4,5). 1. Polishing device in particular for optical surfaces such as spectacle lenses comprising a support (1) and a membrane (2) having an apex and a peripheral rim (3) secured to the support, and to the external face of which may be attached a surfacing material, characterized in that the membrane (2) consists of an elastomeric material in which are embedded two elastically deformable crossed blades (4,5), the ends of the regularly spaced blades each being extended at the rim peripheral (3) of the membrane (2) by a means for securing said membrane to the support and in that the support comprises displacement means for causing the displacement of the securing means in the direction of the blade to which they are connected whereby the radii of curvature of the blades (4,5) are modified in a controlled manner.
2. Dispositif selon la revendication 1, caractérisé en ce que la membrane (2), au repos, présente un rebord périphérique (3) circulaire défini par un axe de révolution (C) passant par le sommet de ladite membrane, et en ce que les deux lames (4,5) élastiquement déformables se croisent au niveau dudit axe de révolution (C). 2. Device according to claim 1, characterized in that the membrane (2), at rest, has a circular peripheral rim (3) defined by an axis of revolution (C) passing through the top of said membrane, and in that the two elastically deformable blades (4,5) intersect at said axis of revolution (C).
3. Dispositif selon la revendication 2, caractérisé en ce qu'il comprend en outre des moyens pour maintenir le sommet de la membrane (2) suivant la direction de l'axe de révolution (C).3. Device according to claim 2, characterized in that it further comprises means for holding the top of the membrane (2) in the direction of the axis of revolution (C).
4. Dispositif selon la revendication 2, caractérisé en ce que les deux lames (4,5) sont fixées l'une à l'autre au niveau de leur zone d'intersection. 5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les lames (4,4. Device according to claim 2, characterized in that the two blades (4,5) are fixed to each other at their intersection zone. 5. Device according to any one of the preceding claims, characterized in that the blades (4,
5) sont disposées à angles droits.5) are arranged at right angles.
6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins deux lames de renforcement (7) de longueur identique aux lames (4,5) munies de moyens de solidarisation sont noyées dans la membrane (2), chaque lame de renforcement (7) étant disposée à intervalle régulier entre lesdites lames (4,5) munies de moyen de solidarisation.6. Device according to any one of the preceding claims, characterized in that at least two reinforcing blades (7) of identical length to the blades (4,5) provided with securing means are embedded in the membrane (2), each reinforcing blade (7) being arranged at regular intervals between said blades (4,5) provided with securing means.
7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens de déplacement provoquent indépendamment le déplacement de chaque moyen de solidarisation. 8 Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les moyens de déplacement provoquent simultanément le déplacement des moyens de solidarisation des deux extrémités de chaque lame7. Device according to any one of the preceding claims, characterized in that the displacement means independently cause the displacement of each securing means. 8 Device according to any one of claims 1 to 6, characterized in that the displacement means simultaneously cause the displacement of the securing means of the two ends of each blade
9 Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les moyens de déplacement provoquent simultanément le déplacement de chaque moyen de solidarisation9 Device according to any one of claims 1 to 6, characterized in that the displacement means simultaneously cause the displacement of each securing means
10 Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le support (1) comprend en outre des moyens additionnels pour déplacer simultanément dans une direction verticale les moyens de solidarisation des deux extrémités d'une même lame afin de compenser la déformation du rebord périphérique (3) de la membrane(2)10 Device according to any one of the preceding claims, characterized in that the support (1) further comprises additional means for simultaneously moving in a vertical direction the means for securing the two ends of the same blade in order to compensate for the deformation of the peripheral edge (3) of the membrane (2)
1 1 Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque moyen de solidarisation est constitué par un insert (6) partiellement noyé dans le rebord périphérique (3) de la membrane(2), ledit insert étant pourvu sur sa partie supérieure d'une encoche (61) de façon à loger l'une des extrémités d'une lame et sur sa partie inférieure d'un alésage taraudé (62) destiné à coopérer avec les moyens de déplacement du support1 1 Device according to any one of the preceding claims, characterized in that each securing means consists of an insert (6) partially embedded in the peripheral rim (3) of the membrane (2), said insert being provided on its upper part of a notch (61) so as to accommodate one of the ends of a blade and on its lower part of a threaded bore (62) intended to cooperate with the means for moving the support
12 Procédé de fabrication de la membrane dont les deux rayons de courbure varient entre un rayon de courbure minimum et un rayon de courbure maximum, selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend les étapes suivantes12 A method of manufacturing the membrane, the two radii of curvature of which vary between a minimum radius of curvature and a maximum radius of curvature, according to any one of the preceding claims, characterized in that it comprises the following steps
- on dispose les lames dans un moule en leur appliquant une précontrainte correspondant au rayon de courbure minimum,the blades are placed in a mold by applying a preload corresponding to the minimum radius of curvature,
- on dispose un insert à chacune des deux extrémités desdites lames, - on injecte dans le moule un matériau élastomérique dans lequel lesdites lames sont noyées et les inserts partiellement noyés, etan insert is placed at each of the two ends of said blades, an elastomeric material is injected into the mold in which said blades are embedded and the inserts are partially embedded, and
- on démoule et on laisse l'ensemble ainsi obtenu atteindre un état d'équilibre dans lequel les deux rayons de courbure ont un rayon de courbure maximum 13 Installation de polissage utilisant des dispositifs de polissoir selon l'une quelconque des revendications 1 à 1 1 , caractérisée en ce qu'elle comprend- It is removed from the mold and the assembly thus obtained is allowed to reach a state of equilibrium in which the two radii of curvature have a maximum radius of curvature 13 Polishing installation using polishing devices according to any one of Claims 1 to 1 1 , characterized in that it comprises
- une pluralité de machines de polissage, chaque machine étant apte à recevoir un dispositif de polissoir et à l'entraîner en mouvement,a plurality of polishing machines, each machine being capable of receiving a polishing device and of driving it in movement,
- une pluralité de postes de réglage aptes à recevoir chacun un dispositif de polissoir, chaque poste de réglage étant relié à au moins une machine de polissage par l'intermédiaire d'un moyen de transfert, et en ce que chaque poste de réglage comprend des organes moteurs pour provoquer le déplacement des moyens de déplacement du dispositif de polissoir, eta plurality of adjustment stations each capable of receiving a polishing device, each adjustment station being connected to at least one polishing machine by means of a transfer means, and in that each station adjustment comprises drive members for causing the displacement of the displacement means of the polishing device, and
- un ensemble de commande pour commander les organes moteurs en fonction de la forme que l'on veut donner à la membrane dudit dispositif de polissoir- a control assembly for controlling the drive members as a function of the shape which it is desired to give to the membrane of said polisher device
14 Installation de polissage selon la revendication 13, caractérisée en ce que chaque poste de réglage est en outre relié par l'intermédiaire d'un moyen de transfert à des moyens de remplacement dudit dispositif de polissoir par au moins un autre dispositif dont les rayons de courbure des lames au repos sont différents 15 Installation de polissage selon la revendication 14, caractérisée en ce que ledit ensemble de commande comprend14 Polishing installation according to claim 13, characterized in that each adjustment station is further connected by means of a transfer means to means for replacing said polishing device with at least one other device whose radii of curvature of the blades at rest are different 15 Polishing installation according to claim 14, characterized in that said control assembly comprises
- des moyens pour recevoir des informations sur la forme que l'on veut donner à la membrane du dispositif de polissoir, etmeans for receiving information on the shape which it is desired to give to the membrane of the polishing device, and
- des moyens pour convertir lesdites informations de forme en des informations de commande pour les moyens de remplacement et pour les organes moteurs du poste de réglagemeans for converting said shape information into control information for the replacement means and for the drive members of the adjustment station
16 Installation de polissage selon la revendication 15, caractérisée en ce que chaque poste de réglage comprend de plus des moyens de prise d'images pour obtenir des informations sur la forme effective de la membrane et la forme programmée de la membrane 16 Polishing installation according to claim 15, characterized in that each adjustment station further comprises image taking means for obtaining information on the effective shape of the membrane and the programmed shape of the membrane
PCT/FR1999/001546 1998-06-29 1999-06-28 Abrader device WO2000000324A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR98/08212 1998-06-29
FR9808212A FR2780325B1 (en) 1998-06-29 1998-06-29 POLISHING DEVICE

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WO2000000324A1 true WO2000000324A1 (en) 2000-01-06

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EP1473116A1 (en) * 2003-05-02 2004-11-03 Loh Optikmaschinen AG Tool for finishing of optical surfaces
US7217176B2 (en) 2004-10-29 2007-05-15 Schneider Gmbh & Co. Kg Polishing tool with several pressure zones
US7227707B2 (en) 2002-08-23 2007-06-05 Intergraph Hardware Technologies, Co. Holding device for an optical element
US7364493B1 (en) 2006-07-06 2008-04-29 Itt Manufacturing Enterprises, Inc. Lap grinding and polishing machine

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Publication number Priority date Publication date Assignee Title
ATE555875T1 (en) 2002-01-09 2012-05-15 Hoya Corp POIER METHOD

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US5695393A (en) * 1994-11-26 1997-12-09 Loh Optikmaschinen Ag Tool for the precision processing of optical surfaces
FR2764835A1 (en) * 1997-06-19 1998-12-24 Delamare Sovra Sa Adjustable polisher for shaping spectacle lenses

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US3775909A (en) * 1972-01-24 1973-12-04 Corning Glass Works Successive lens polishing apparatus
FR2654027A1 (en) * 1989-11-06 1991-05-10 Essilor Int Self-shaping surfacing tool
US5695393A (en) * 1994-11-26 1997-12-09 Loh Optikmaschinen Ag Tool for the precision processing of optical surfaces
FR2764835A1 (en) * 1997-06-19 1998-12-24 Delamare Sovra Sa Adjustable polisher for shaping spectacle lenses

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7227707B2 (en) 2002-08-23 2007-06-05 Intergraph Hardware Technologies, Co. Holding device for an optical element
EP1473116A1 (en) * 2003-05-02 2004-11-03 Loh Optikmaschinen AG Tool for finishing of optical surfaces
US7066794B2 (en) 2003-05-02 2006-06-27 Satisloh Gmbh Tool for fine machining of optically active surfaces
US7217176B2 (en) 2004-10-29 2007-05-15 Schneider Gmbh & Co. Kg Polishing tool with several pressure zones
US7364493B1 (en) 2006-07-06 2008-04-29 Itt Manufacturing Enterprises, Inc. Lap grinding and polishing machine

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FR2780325A1 (en) 1999-12-31
FR2780325B1 (en) 2000-09-15

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