EP0181788A1 - Method and device for stabilizing the grinding speed of the circumference of spectacle lenses on a machine equipped with a copying device - Google Patents
Method and device for stabilizing the grinding speed of the circumference of spectacle lenses on a machine equipped with a copying device Download PDFInfo
- Publication number
- EP0181788A1 EP0181788A1 EP85401841A EP85401841A EP0181788A1 EP 0181788 A1 EP0181788 A1 EP 0181788A1 EP 85401841 A EP85401841 A EP 85401841A EP 85401841 A EP85401841 A EP 85401841A EP 0181788 A1 EP0181788 A1 EP 0181788A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- amplifier
- glass
- machine
- output
- input
- 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
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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
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
- B24B9/144—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms the spectacles being used as a template
Definitions
- the present invention relates to the machining of spectacle lenses on the grinding machines used to cut the blanks.
- the residence time of the various points on the periphery of the glass can vary to a large extent depending on the shape of the glass to be machined, this time being constant only in the case of a glass of circular shape.
- the residence time decreases considerably, because this part remains only a short instant in contact with the grinding wheel, while the parts of angles of the glass remain in contact with the grinding wheel for a time which can in some cases represent up to 1/4 of the glass revolution time.
- the invention therefore aims to provide a method and a device for stabilizing this residence time.
- the invention also relates to a device for implementing this method, characterized in that it comprises a circuit comprising a capacitor in series with the input of an OP amplifier, a resistor in parallel between the input and the output of the amplifier, a rectifier connected to the output of said circuit, and an amplifier-subtractor, one input of which is connected to the output of the rectifier and the other input of which is connected to a circuit providing a stabilized voltage representing the speed maximum machining of the grinding machine, the output of said amplifier-subtractor being applied to a device for controlling the glass drive motor, as known per se.
- FIGS. 1 and 2 are diagrams showing the residence time of the different points of the periphery of a square-shaped spectacle lens on an abrasive strip and on a circular grinding wheel, respectively.
- Figure 3 is a diagram of a machine for cutting spectacle lenses comprising a device for regulating the machining speed according to the invention.
- the machine for cutting spectacle lenses comprises a grinding wheel M, a carriage C moving around an axis A and carrying an axis 1 carrying the glass V to be cut and driven by a motor 2.
- the machine also includes a copier designated as a whole by the reference 3 comprising a device 4 for supporting and driving a mount 5 in rotation, a feeler 6 whose head is in contact with the bottom of the bezel, this feeler being mounted on a sliding support 7 resiliently recalled and connected to a potentiometer 8, this assembly being known per se.
- a copier designated as a whole by the reference 3 comprising a device 4 for supporting and driving a mount 5 in rotation, a feeler 6 whose head is in contact with the bottom of the bezel, this feeler being mounted on a sliding support 7 resiliently recalled and connected to a potentiometer 8, this assembly being known per se.
- an electronic device E comprising a capacitor 9 in series with an amplifier OP 10, a resistor 11 in derivation of the amplifier 10, a rectifier 12 connected to the output of the amplifier 10, and an amplifier subtractor 13, one input of which is connected to the output of rectifier 12 and the other input of which is connected to a circuit 14 providing a stabilized reference voltage.
- the output signal of the potentiometer 8 representing the movement of the mount 5 is applied to the circuit comprising the capacitor 9, the amplifier 10 and the resistor 11, and the output of the amplifier 10 provides the absolute value of the derivative, c ' that is to say the speed of variation of the rays of the desired lens measured by the probe 6 on the internal periphery of the bezel of the frame.
- This absolute value is rectified by the rectifier 12 and is applied to a first input of the amplifier-subtractor 13, the other input of which receives a stabilized voltage supplied by the circuit 14 and representative of the maximum machining speed of the machine.
- the output signal of the amplifier 13 is then applied to a known device, not shown, for controlling the motor 2 to drive the latter and obtain stabilization of the residence time of the different points of the periphery of a spectacle lens. on the machine wheel.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
Description
Procédé et dispositif pour stabiliser la vitesse de meulage de la périphérie des verres de lunettes sur une machine comportant une copieuse.Method and device for stabilizing the grinding speed of the periphery of spectacle lenses on a machine comprising a copying machine.
La présente invention est relative à l'usinage des verres de lunettes sur les machines à meuler utilisées pour tailler les ébauches.The present invention relates to the machining of spectacle lenses on the grinding machines used to cut the blanks.
Lorsqu'on taille une ébauche, le temps de séjour des différents point de la périphérie du verre peut varier dans une mesure importante en fonction de la forme du verre à usiner, ce temps n'étant constant que dans le cas d'un verre de forme circulaire.When cutting a blank, the residence time of the various points on the periphery of the glass can vary to a large extent depending on the shape of the glass to be machined, this time being constant only in the case of a glass of circular shape.
En effet, lors de l'usinage d'une partie rectiligne du contour du verre, le temps de séjour diminue de façon considérable, car cette partie ne reste qu'un court instant en contact avec la meule, tandis que les parties d'angles du verre restent en contact avec la meule pendant un temps qui peut dans certains cas représenter jusqu'à 1/4 du temps de révolution du verre.Indeed, during the machining of a rectilinear part of the contour of the glass, the residence time decreases considerably, because this part remains only a short instant in contact with the grinding wheel, while the parts of angles of the glass remain in contact with the grinding wheel for a time which can in some cases represent up to 1/4 of the glass revolution time.
Si on considère la vitesse de variation (la dérivée) des rayons du verre mesurés sur celui-ci par rapport au centre d'usinage on constate que celle-ci est grande lorsque le temps de séjour est court et que cette dérivée est faible lorsque le temps de séjour est long.If we consider the speed of variation (the derivative) of the rays of the glass measured on it relative to the machining center we note that it is large when the residence time is short and that this derivative is low when the residence time is long.
Compte tenu de ce qui précède il apparait qu'il est possible de stabiliser le temps de séjour des différents points de la périphérie du verre en pilotant le moteur d'entraînement du verre en rotation au moyen d'informations basées sur la dérivée des rayons.In view of the above, it appears that it is possible to stabilize the residence time of the various points on the periphery of the glass by controlling the motor for driving the glass in rotation by means of information based on the derivative of the rays.
L'invention a en conséquence pour but de réaliser un procédé et un dispositif pour stabiliser ce temps de séjour.The invention therefore aims to provide a method and a device for stabilizing this residence time.
Elle a pour objet à cet effet un procédé pour stabiliser le temps de séjour des différents points de la périphérie des verres de lunettes sur la meule d'une machine à meuler pourvue d'une copieuse, caractérisé en ce qu'on applique les signaux fournis par ladite copieuse à un circuit électronique adapté pour donner la dérivée des rayons du verre désiré, on redresse cette sortie et on la soustrait d'un signal correspondant à la vitesse maximale d'usinage de la machine, et on pilote le moteur d'entraînement du verre en rotation au moyen du signal de différence ainsi obtenu.It has for this purpose a method for stabilizing the residence time of the different points of the periphery of the spectacle lenses on the grinding wheel of a grinding machine provided with a copying machine, characterized in that the signals supplied are applied by said copying machine to an electronic circuit adapted to give the derivative of the rays of the desired glass, this output is rectified and it is subtracted from a signal corresponding to the maximum machining speed of the machine, and the motor for driving the glass in rotation is controlled by means of the difference signal thus obtained.
L'invention a également pour objet un dispositif pour la mise en oeuvre de ce procédé, caractérisé en ce qu'il comprend un circuit comprenant un condensateur en série avec l'entrée d'un amplificateur OP, une résistance en parallèle entre l'entrée et la sortie de l'amplificateur, un redresseur relié à la sortie dudit circuit, et un amplificateur-soustracteur dont une entrée est reliée à la sortie du redresseur et dont l'autre entrée est reliée à un circuit fournissant une tension stabilisée représentant la vitesse maximale d'usinage de la machine à meuler, la sortie dudit amplificateur-soustracteur étant appliquée à un dispositif de commande du moteur d'entraînement du verre, comme connu en soi.The invention also relates to a device for implementing this method, characterized in that it comprises a circuit comprising a capacitor in series with the input of an OP amplifier, a resistor in parallel between the input and the output of the amplifier, a rectifier connected to the output of said circuit, and an amplifier-subtractor, one input of which is connected to the output of the rectifier and the other input of which is connected to a circuit providing a stabilized voltage representing the speed maximum machining of the grinding machine, the output of said amplifier-subtractor being applied to a device for controlling the glass drive motor, as known per se.
La description qui va suivre, en regard du dessin annexé à titre d'exemple non limitatif, permettra de bien comprendre comment la présente invention peut être mise en pratique.The description which follows, with reference to the attached drawing by way of nonlimiting example, will make it possible to understand clearly how the present invention can be put into practice.
Les figures 1 et 2 sont des schémas faisant apparaître le temps de séjour des différents point de la périphérie d'un verre de lunette de forme carrée sur une bande abrasive et sur une meule circulaire, respectivement.FIGS. 1 and 2 are diagrams showing the residence time of the different points of the periphery of a square-shaped spectacle lens on an abrasive strip and on a circular grinding wheel, respectively.
La figure 3 est un schéma d'une machine pour tailler les verres de lunettes comportant un dispositif de régulation de la vitesse d'usinage suivant l'invention.Figure 3 is a diagram of a machine for cutting spectacle lenses comprising a device for regulating the machining speed according to the invention.
En se référant aux figures 1 et 2, on supposera, pour la clarté de l'exemple, que la forme à reproduire est un carré F.Referring to Figures 1 and 2, it will be assumed, for the sake of clarity of the example, that the shape to be reproduced is a square F.
Le verre F, tournant à vitesse constante en sens inverse des aiguilles d'une montre et la meule M1 (ou M2) tournant dans le sens horaire, on voit immédiatement que chaque coin du verre F va rester en contact avec la meule M1, constituée par une bande continue à la figure 1, pendant un temps égal à 1/4 de tour, tandis que chaque côté rectiligne va rester en contact avec la meule pendant un temps très court, voisin de 0.The glass F, rotating at a constant speed in an anti-clockwise direction and the grinding wheel M1 (or M2) rotating clockwise, it is immediately seen that each corner of the glass F will remain in contact with the grinding wheel M1, constituted by a continuous strip in FIG. 1, for a time equal to 1/4 of a turn, while each rectilinear side will remain in contact with the grinding wheel for a very short time, close to 0.
En conservant la même forme de verre à reproduire, mais sur la meule circulaire M2 (figure 2), on voit que le temps de contact entre le verre et la meule M2, pour un coin, va diminuer tout en restant cependant très long comparativement au temps de séjour des différents points du côté.By keeping the same shape of glass to reproduce, but on the circular grinding wheel M2 (figure 2), we see that the contact time between the glass and the grinding wheel M2, for a corner, will decrease while remaining however very long compared to the residence time of the different points on the side.
On voit ainsi que le temps de séjour des différents points de la périphérie d'un verre à usiner avec la meule n'est constant que dans le seul cas d'un verre circulaire et que pour toutes les autres formes, ce temps est variable en fonction de la forme considérée.It can thus be seen that the residence time of the various points of the periphery of a glass to be machined with the grinding wheel is constant only in the only case of a circular glass and that for all the other forms, this time is variable in depending on the form considered.
En se référant à la figure 3, la machine à tailler les verres de lunettes comprend une meule M, un chariot C se déplaçant autour d'un axe A et portant un axe 1 portant le verre V à tailler et entrainé par un moteur 2.Referring to FIG. 3, the machine for cutting spectacle lenses comprises a grinding wheel M, a carriage C moving around an axis A and carrying an axis 1 carrying the glass V to be cut and driven by a
La machine comprend également une copieuse désignée dans son ensemble par la référence 3 comportant un dispositif 4 de support et d'entraînement d'une monture 5 en rotation, un palpeur 6 dont la tête est en contact avec le fond du drageoir, ce palpeur étant monté sur un support coulissant 7 rappelé élastiquement et relié à un potentiomètre 8, cet ensemble étant connu en soi.The machine also includes a copier designated as a whole by the
Suivant l'invention il est prévu un dispositif électronique E comprenant un condensateur 9 en série avec un amplificateur OP 10, une résistance 11 en dérivation de l'amplificateur 10, un redresseur 12 relié à la sortie de l'amplificateur 10, et un amplificateur-soustracteur 13 dont une entrée est reliée à la sortie du redresseur 12 et dont l'autre entrée est reliée à un circuit 14 fournissant une tension stabilisée de référence.According to the invention there is provided an electronic device E comprising a capacitor 9 in series with an amplifier OP 10, a resistor 11 in derivation of the amplifier 10, a
Le signal de sortie du potentiomètre 8 représentant le mouvement de la monture 5 est appliqué au circuit comprenant le condensateur 9, l'amplificateur 10 et la résistance 11, et la sortie de l'amplificateur 10 fournit la valeur absolue de la dérivée, c'est-à-dire la vitesse de variation des rayons du verre désiré mesurée par le palpeur 6 sur la périphérie interne du drageoir de la monture.The output signal of the potentiometer 8 representing the movement of the mount 5 is applied to the circuit comprising the capacitor 9, the amplifier 10 and the resistor 11, and the output of the amplifier 10 provides the absolute value of the derivative, c ' that is to say the speed of variation of the rays of the desired lens measured by the probe 6 on the internal periphery of the bezel of the frame.
Cette valeur absolue est redressée par le redresseur 12 et est appliquée à une première entrée de l'amplificateur-soustracteur 13 dont l'autre entrée reçoit une tension stabilisée fournie par le circuit 14 et représentative de la vitesse maximale d'usinage de la machine.This absolute value is rectified by the
Le signal de sortie de l'amplificateur 13 est alors appliqué à un dispositif connu, non représenté, de commande du moteur 2 pour piloter celui-ci et obtenir une stabilisation du temps de séjour des différents points de la périphérie d'un verre de lunette sur la meule de la machine.The output signal of the
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8417115 | 1984-11-09 | ||
| FR8417115A FR2573225B1 (en) | 1984-11-09 | 1984-11-09 | METHOD AND DEVICE FOR STABILIZING THE GRINDING SPEED OF THE PERIPHERAL OF GLASSES ON A MACHINE COMPRISING A COPIER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0181788A1 true EP0181788A1 (en) | 1986-05-21 |
| EP0181788B1 EP0181788B1 (en) | 1988-03-02 |
Family
ID=9309439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19850401841 Expired EP0181788B1 (en) | 1984-11-09 | 1985-09-23 | Method and device for stabilizing the grinding speed of the circumference of spectacle lenses on a machine equipped with a copying device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0181788B1 (en) |
| JP (1) | JPS61293763A (en) |
| DE (1) | DE3561697D1 (en) |
| FR (1) | FR2573225B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2614690A1 (en) * | 1987-04-28 | 1988-11-04 | Essilor Int | CONTOUR READING APPARATUS, IN PARTICULAR FOR EYEGLASS MOUNT |
| US5121548A (en) * | 1989-10-06 | 1992-06-16 | Essilor International Cie Generale D'optique | Contour follower device, in particular for eyeglass frames |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110497255B (en) * | 2019-08-30 | 2020-07-28 | 西安交通大学 | Free-form surface polishing residence time calculation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR519016A (en) * | 1920-06-21 | 1921-06-03 | Standard Optical Co | Machine for grinding the edges of optical glasses |
| FR1441057A (en) * | 1965-07-08 | 1966-06-03 | Fujitsu Ltd | Machine for grinding a cam controlled according to digital data |
| FR2229213A6 (en) * | 1973-05-09 | 1974-12-06 | Asselin Robert | Optical lense grinder - with copying mechanism for spectacle rim |
| DE2712029A1 (en) * | 1977-03-18 | 1978-09-21 | Mitsubishi Heavy Ind Ltd | Crankshaft grinding machine speed controller - monitors motor rotation and swinging table angular speed for constant grinding speed |
| US4262454A (en) * | 1978-06-20 | 1981-04-21 | Toyoda-Koki Kabushiki-Kaisha | Workpiece rotational speed controller for cam grinding machine |
| GB2092489A (en) * | 1981-02-05 | 1982-08-18 | Hoya Lens Corp | Apparatus for cutting peripheral groove on spectacle lens |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4915946B1 (en) * | 1970-08-03 | 1974-04-18 | ||
| DE2332001C3 (en) * | 1972-06-28 | 1980-07-10 | Robert Raymond Maurice Asselin | Edge grinding machine for eyeglass lenses |
| JPS5845854A (en) * | 1981-09-10 | 1983-03-17 | Nippon Kogaku Kk <Nikon> | Spectacle lens grinding machine |
-
1984
- 1984-11-09 FR FR8417115A patent/FR2573225B1/en not_active Expired
-
1985
- 1985-09-23 DE DE8585401841T patent/DE3561697D1/en not_active Expired
- 1985-09-23 EP EP19850401841 patent/EP0181788B1/en not_active Expired
- 1985-10-31 JP JP24300785A patent/JPS61293763A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR519016A (en) * | 1920-06-21 | 1921-06-03 | Standard Optical Co | Machine for grinding the edges of optical glasses |
| FR1441057A (en) * | 1965-07-08 | 1966-06-03 | Fujitsu Ltd | Machine for grinding a cam controlled according to digital data |
| FR2229213A6 (en) * | 1973-05-09 | 1974-12-06 | Asselin Robert | Optical lense grinder - with copying mechanism for spectacle rim |
| DE2712029A1 (en) * | 1977-03-18 | 1978-09-21 | Mitsubishi Heavy Ind Ltd | Crankshaft grinding machine speed controller - monitors motor rotation and swinging table angular speed for constant grinding speed |
| US4262454A (en) * | 1978-06-20 | 1981-04-21 | Toyoda-Koki Kabushiki-Kaisha | Workpiece rotational speed controller for cam grinding machine |
| GB2092489A (en) * | 1981-02-05 | 1982-08-18 | Hoya Lens Corp | Apparatus for cutting peripheral groove on spectacle lens |
Non-Patent Citations (1)
| Title |
|---|
| PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 128 (M-220) [1273], 3 juin 1983; & JP - A - 58 45 854 (NIHON KOUPAKU KOGYO K.K.) 17-03-1983 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2614690A1 (en) * | 1987-04-28 | 1988-11-04 | Essilor Int | CONTOUR READING APPARATUS, IN PARTICULAR FOR EYEGLASS MOUNT |
| EP0291378A1 (en) * | 1987-04-28 | 1988-11-17 | ESSILOR INTERNATIONAL Compagnie Générale d'Optique | Contour reading apparatus, especially for a spectacles frame |
| US4995170A (en) * | 1987-04-28 | 1991-02-26 | Essilor International Cie General D'optique | Contour reading device suitable for use on eyeglass frames |
| US5121548A (en) * | 1989-10-06 | 1992-06-16 | Essilor International Cie Generale D'optique | Contour follower device, in particular for eyeglass frames |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3561697D1 (en) | 1988-04-07 |
| JPS61293763A (en) | 1986-12-24 |
| FR2573225A1 (en) | 1986-05-16 |
| EP0181788B1 (en) | 1988-03-02 |
| FR2573225B1 (en) | 1987-02-06 |
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