FR2573225A1 - METHOD AND DEVICE FOR STABILIZING THE GRINDING SPEED OF THE PERIPHERAL OF GLASSES OF EYEGLASSES ON A MACHINE COMPRISING A COPY - Google Patents
METHOD AND DEVICE FOR STABILIZING THE GRINDING SPEED OF THE PERIPHERAL OF GLASSES OF EYEGLASSES ON A MACHINE COMPRISING A COPY Download PDFInfo
- Publication number
- FR2573225A1 FR2573225A1 FR8417115A FR8417115A FR2573225A1 FR 2573225 A1 FR2573225 A1 FR 2573225A1 FR 8417115 A FR8417115 A FR 8417115A FR 8417115 A FR8417115 A FR 8417115A FR 2573225 A1 FR2573225 A1 FR 2573225A1
- Authority
- FR
- France
- Prior art keywords
- machine
- amplifier
- glass
- 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
Links
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
Landscapes
- 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
SUIVANT CE PROCEDE, ON PILOTE LE MOTEUR D'ENTRAINEMENT DU VERRE EN ROTATION A L'AIDE D'INFORMATIONS ESSENTIELLEMENT BASEES SUR LA DERIVEE DES RAYONS DU VERRE DESIRE MESURES PAR LA COPIEUSE SUR UNE MONTURE OU SUR UN GABARIT. LES SIGNAUX DE LA COPIEUSE3, 6, 7 SONT APPLIQUES A UN CIRCUITE COMPRENANT UN CONDENSATEUR9, UNE RESISTANCE11 EN PARALLELE AVEC UN AMPLIFICATEUR OP 10, UN REDRESSEUR12 ET UN AMPLIFICATEUR-SOUSTRACTEUR13 AYANT UNE ENTREE RELIEE AUDIT REDRESSEUR ET SON AUTRE ENTREE RELIEE A UNE SOURCE DE TENSION STABILISE REPRESENTATIVE DE LA VITESSE MAXIMALE D'USINAGE DE LA MACHINE. APPLICATION A L'USINAGE DES VERRES DE LUNETTES.FOLLOWING THIS PROCESS, THE DRIVING MOTOR OF THE ROTATING GLASS IS DRIVED WITH THE HELP OF INFORMATION ESSENTIALLY BASED ON THE DERIVATIVE OF THE RADIUS OF THE DESIRED GLASS MEASURED BY THE COPIER ON A MOUNT OR ON A TEMPLATE. THE SIGNALS OF THE COPIER3, 6, 7 ARE APPLIED TO A CIRCUIT INCLUDING A CAPACITOR9, A RESISTOR11 IN PARALLEL WITH AN OP 10 AMPLIFIER, A RECTIFIER12 AND AN AMPLIFIER-SUBTRACTOR13 HAVING AN INPUT CONNECTED TO THE RECTIFIER AND ITS OTHER CONNECTED INPUT TO THE RECTIFIER AND ITS STABILIZED VOLTAGE REPRESENTATIVE OF THE MAXIMUM WORKING SPEED OF THE MACHINE. APPLICATION TO THE MACHINING OF GLASSES OF GLASSES.
Description
La présente invention est relative à l'usinage des verres de lunettes surThe present invention relates to the machining of spectacle lenses on
les machines à meuler utilisées pour the grinding machines used to
tailler les ébauches.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 a usiner, ce temps n'étant constant que dans le cas d'un verre When cutting a blank, the residence time of the different points of the periphery of the glass may 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
de forme circulaire.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 Indeed, during the machining of a rectilinear part of the outline of the glass, the residence time decreases considerably, because this part remains only a short moment in contact with the grinding wheel, while the parts of angles of glass remain in contact with the grinding wheel for a time that can in some cases represent up to 1/4 of the
révolution du verre.glass revolution.
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 If we consider the speed of variation (the derivative) of the rays of the glass measured thereon with respect to the machining center, it is found that it is large when the residence time is short and this derivative is weak.
lorsque le temps de séjour est long. 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 In view of the foregoing it appears that it is possible to stabilize the residence time of the various points of the periphery of the glass by driving the drive motor of the rotating glass by means of information
basées sur la dérivée des rayons. 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 object of the invention is therefore to provide a method and a device for stabilizing this residence time.
Elle a pour objet à cet effet un procédé pour stabi- Its object is to this end a process for stabilizing
liser le temps de séjour des différents pointsde 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 to determine the residence time of the various points of the periphery of spectacle lenses on the grinding wheel of a grinding machine provided with a copying machine, characterized in that the signals supplied by said copying machine are applied to an electronic circuit adapted to give the derived from the rays of the desired glass,
redresse cette sortie et on la soustrait d'un signal cor- right this output and subtract it from a cor-
respondant à la vitesse maximale d'usinage de la machine, et on pilote le moteur d'entraînement du verre en rotation au corresponding to the maximum machining speed of the machine, and the driving motor of the rotating glass is
moyen du signal de différence ainsi obtenu. 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 amplifica- teur- 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-différentiateur étant appliquée à un dispositif de commande du moteur d'entraînement du verre, comme connu The invention also relates to a device for carrying out this method, characterized in that it comprises a circuit comprising a capacitor in series with the input of an amplifier OP, a resistor in parallel between the input and output of the amplifier, a rectifier connected to the output of said circuit, and an amplifier-subtractor whose input is connected to the output of the rectifier and whose other input is connected to a circuit providing a stabilized voltage representing the maximum machining speed of the grinding machine, the output of said amplifier-differentiator being applied to a control device of the glass drive motor, as known
en soi.in itself.
La description qui va suivre, en regard du dessin The description that follows, next to the drawing
annexé à titre d'exemple non limitatif, permettra de bien comprendre comment la présente invention peut être mise en pratique. Les figures I 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 annexed by way of non-limiting example, will provide a good understanding of how the present invention can be put into practice. Figures I and 2 are diagrams showing the residence time of the various points of the periphery of a square bezel glass on an abrasive belt and on
une meule circulaire,respectivement. a circular grinding wheel, respectively.
La figure 3 est un schéma d'une machine pour tail- Figure 3 is a diagram of a machine for tailoring
ler les verres de lunettes comportant un dispositif de régu- glasses having a regulating device
lation de la vitesse d'usinage suivant l'invention. lation of 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 E. 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 constact avec la meule MI, constituée par une bande continue à la figure 1, pendant un temps égal à i/4 de tour, tandis que chaque côté rectiligne va rester en contact avec la meule pendant un temps très With reference to FIGS. 1 and 2, it will be assumed, for the sake of clarity, that the shape to be reproduced is a square E. The glass F, rotating at a constant speed in a counter-clockwise direction and the grinding wheel M1 (or M2) rotating in the clockwise direction, it is immediately seen that each corner of the glass F will remain in constant contact with the wheel MI, constituted by a continuous band in FIG. 1, for a time equal to i / 4 of a turn, while each straight side will stay in contact with the grinding wheel for a very long time
court, voisin de 0.short, 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, By keeping the same form of glass to be reproduced, but on the circular grinding wheel M2 (FIG. 2), it is seen that the contact time between the glass and the grinding wheel M2, for a corner,
va diminuer tout en restant cependant très long comparative- will decrease but still remain very
ment au temps de séjour des différents points du côté. 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. 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 It can thus be seen that the residence time of the different points of the periphery of a glass to be machined with the grinding wheel is constant only in the case of a circular glass and that for all the other shapes, this time is variable in function of the considered form. Referring to FIG. 3, the spectacle lens cutting machine comprises a grinding wheel M, a carriage C moving around an axis A and bearing an axis 1 carrying
le verre V à tailler et entrainé par un moteur 2. the glass V to cut and driven by a motor 2.
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 The machine also comprises a copier generally designated by the reference 3 comprising a device 4 for supporting and driving a mounting 5 in rotation, a probe 6 whose head is in contact with the bottom of the bezel, this probe being mounted on a sliding support 7 resiliently biased and connected to a potentiometer 8, this
ensemble étant connu en soi.together being known per se.
Suivant l'invention il est prévu un dispositif électronique E comprenant un condensateur 9 en série avec un amplificateur OP 10, une résistance 11l 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 According to the invention there is provided an electronic device E comprising a capacitor 9 in series with an amplifier OP 10, a resistor 11l in shunt of the amplifier 10, a rectifier 12 connected to the output of the amplifier 10, and an amplifier -subtractor 13 whose input is connected to the output of the rectifier 12 and whose other input is connected to a circuit 14 providing
une tension stabilisée de référence. a stabilized reference voltage.
Le signal de sortie du potentiomètre 8 représentant The output signal of the potentiometer 8 representing
le mouvement de-la monture 5 est appliqué au circuit compre- the movement of the frame 5 is applied to the circuit comprising
nant 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 the capacitor 9, the amplifier 10 and the resistor 11, and the output of the amplifier 10 provides the absolute value of the derivative, that is to say the rate of variation of the rays of the desired glass measured by the probe 6 on the
périphérie interne du drageoir de la monture. inner periphery of the bezel of the mount.
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 This absolute value is rectified by the rectifier 12 and is applied to a first input of the subtractor amplifier 13 whose other input receives a stabilized voltage supplied by the circuit 14 and representative of the
vitesse maximale d'usinage de la machine. maximum machining speed of the machine.
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 25732z5 du temps de séjour des différents points de la périphérie 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 to obtain a stabilization 25732z5 of the residence time of the various points of the periphery.
d'un verre de lunette sur la meule de la machine. a glass of telescope on the wheel of the machine.
Claims (2)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
DE8585401841T DE3561697D1 (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 |
EP19850401841 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 |
JP24300785A JPS61293763A (en) | 1984-11-09 | 1985-10-31 | Method and device for stabilizing speed of grinding of periphery of lens for spectacle on grinder with copier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
---|---|
FR2573225A1 true FR2573225A1 (en) | 1986-05-16 |
FR2573225B1 FR2573225B1 (en) | 1987-02-06 |
Family
ID=9309439
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8417115A Expired 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 |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0181788B1 (en) |
JP (1) | JPS61293763A (en) |
DE (1) | DE3561697D1 (en) |
FR (1) | FR2573225B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110497255A (en) * | 2019-08-30 | 2019-11-26 | 西安交通大学 | A kind of free form surface polishing residence time calculation method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2614690B1 (en) * | 1987-04-28 | 1990-11-09 | Essilor Int | CONTOUR READING APPARATUS, PARTICULARLY FOR EYEWEAR MOUNTING |
FR2652893B1 (en) * | 1989-10-06 | 1993-03-19 | Essilor Int | CONTOUR READING APPARATUS, PARTICULARLY FOR GLASSES. |
Citations (7)
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 |
JPS5845854A (en) * | 1981-09-10 | 1983-03-17 | Nippon Kogaku Kk <Nikon> | Spectacle lens grinding machine |
Family Cites Families (2)
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 |
-
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 (7)
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 |
JPS5845854A (en) * | 1981-09-10 | 1983-03-17 | Nippon Kogaku Kk <Nikon> | Spectacle lens grinding machine |
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 KOUGAKU KOGYO K.K.) 17-03-1983 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110497255A (en) * | 2019-08-30 | 2019-11-26 | 西安交通大学 | A kind of free form surface polishing residence time calculation method |
CN110497255B (en) * | 2019-08-30 | 2020-07-28 | 西安交通大学 | Free-form surface polishing residence time calculation method |
Also Published As
Publication number | Publication date |
---|---|
EP0181788A1 (en) | 1986-05-21 |
DE3561697D1 (en) | 1988-04-07 |
JPS61293763A (en) | 1986-12-24 |
EP0181788B1 (en) | 1988-03-02 |
FR2573225B1 (en) | 1987-02-06 |
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