EP0606034B1 - Machine à meuler des lentilles ophtalmiques - Google Patents

Machine à meuler des lentilles ophtalmiques Download PDF

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Publication number
EP0606034B1
EP0606034B1 EP93403193A EP93403193A EP0606034B1 EP 0606034 B1 EP0606034 B1 EP 0606034B1 EP 93403193 A EP93403193 A EP 93403193A EP 93403193 A EP93403193 A EP 93403193A EP 0606034 B1 EP0606034 B1 EP 0606034B1
Authority
EP
European Patent Office
Prior art keywords
axis
vernier
head frame
lens
grinding machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93403193A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0606034A1 (fr
Inventor
Michel Nauche
Laurent Guillermin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique SA
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 Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Publication of EP0606034A1 publication Critical patent/EP0606034A1/fr
Application granted granted Critical
Publication of EP0606034B1 publication Critical patent/EP0606034B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B24B47/225—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses
    • 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
    • B24B9/148—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 electrically, e.g. numerically, controlled

Definitions

  • the present invention relates to a machine for grinding ophthalmic lenses, comprising one or more grinding wheels rotatably mounted about an axis and driven by a motor, a rocker pivotally mounted relative to an axis parallel to said axis of the grinding wheels, a vernier, said rocker comprising gripping means for holding and rotating a lens about an axis, said vernier moving substantially along its longitudinal axis as a function of the angular position of said gripping means.
  • the trimming operation is the operation which makes it possible to adapt the outline of an ophthalmic lens, which is generally circular, to the outline of the frame intended to receive it. It therefore consists in removing certain parts of the periphery of the lens.
  • the beveling operation of an ophthalmic lens which is implemented after trimming, makes it possible to adapt the section of the peripheral edge of the lens, so that it can engage in the groove that a mounting frame usually comprises. glasses.
  • the bevelling of a lens therefore consists in providing on the peripheral edge of the lens a rib or bevel, which generally has a triangular shape.
  • the grooving operation of an ophthalmic lens is also implemented after trimming the lens. It allows to adapt the section of the peripheral edge of the lens so that it can be mounted in certain types of frames. Indeed, some frames do not have a groove on the entire inner perimeter of the frame; on the contrary, for example, the frame only corresponds to the upper part of the lens and the lower part of the lens is only retained by a transparent wire. In such a case, it is necessary to provide a groove or groove, most often triangular or semi-circular on the peripheral edge of the lens.
  • These grinding machines generally consist of a chassis which supports on the one hand one or more diamond grinding wheels, often joined to constitute a train of grinding wheels, and mounted rotatably around an axis.
  • the chassis also supports an ophthalmic lens holder rocker.
  • This lever has gripping means capable of receiving, maintaining and rotating the ophthalmic lens to be treated.
  • the rocker and the grinding wheel (s) are capable of moving relative to each other, on the one hand along the direction of the axis of the grinding wheels (axial movement) and, on the other hand part, substantially perpendicular to this axis (orthoradial movement).
  • the relative axial movement makes it possible to pass from one grinding wheel to another and also makes it possible to follow the contours of the lens during the beveling or grooving operation.
  • the substantially orthoradial relative movement makes it possible to machine lenses of non-circular shape.
  • the present invention relates to this substantially orthoradial movement of the rocker relative to the grinding wheels in a grinding machine.
  • the grinding wheel (s) are rotatably mounted around a first axis and the rocker is slidably and pivotally mounted relative to a second axis parallel to the first.
  • the scale is sometimes also mounted movable perpendicular to the axis of the wheel (s).
  • support means urge the rocker towards the axis of the grinding wheels.
  • These support means result from the effect of gravity alone on the scale or from the combined effect of gravity and means such as springs or a counterweight system.
  • the support means which urge the rocker in the direction of the grinding wheel axis are formed by the effect of gravity and by a spring whose tension is adjustable.
  • a template having the shape of the lens to be obtained is mounted at the same time as the lens on the axis of rotation thereof.
  • a vernier is mounted stationary with respect to the axis of the grinding wheels and has at its end a key allowing to determine when the vernier comes into contact with the template.
  • the template is replaced by a disc and the vernier moves substantially along its longitudinal axis depending on the shape of the lens to be obtained.
  • a button located at the end of the vernier allows in the same way to determine when the vernier comes into contact with the disc. In both cases, when the vernier key comes into contact with the template or the disc, in a given angular position of the lens, this means that the machining is finished in this angular position.
  • the lens is supported on one of the grinding wheels, under the action of the support means.
  • the contact of the vernier key on the template or on the disc makes it possible to determine for each angular position of the glass the moment when the machining is finished.
  • the support means cause a constant support load on the glass in the case of a counterweight, and substantially constant in the case of an elastic return by spring. This can, in the case of high power organic glasses, cause too great a force on the grinding wheel and lead to stalling of the motor. Conversely, in the case of very thin glasses, this constant bearing load may prove to be too high and cause the glass to burst.
  • a machining mode consists in choosing a direction of rotation of the lens, and in changing this direction of rotation with each contact of the vernier key on the template or the disc.
  • this type of system is intrinsically limited in its precision by the necessary existence of a stroke of the button arranged at the end of the vernier.
  • JP-A-4 315 563 relates to a known grinding machine of the type described in the preamble of claim 1, with a rocker resting on a vermier mounted on a chassis.
  • the scale of this document further includes support means for adjusting the value of the grinding pressure (between three predetermined values), according to various parameters. However, there is no positive link between the scale and the vernier.
  • EP-A-0 360 669 describes a system of a type equivalent to that mentioned above.
  • the machine of this document includes a support button, and a template restorer with a support pad movable in translation. It is a system perfectly equivalent to that described above: the only difference is that the mobile vernier is mounted on the scale instead of being mounted on the fixed part or chassis. In any event, it is a system in which a vernier (or skid) moves substantially along its longitudinal axis as a function of the position angle of the lens to be ground, and simply presses the press button.
  • the present invention overcomes these drawbacks. It provides a solution to the problems of vibrations, axial play and rebounds due to the support means or the touch of the vernier. It allows the machining to be adapted to the type of glass worked, without adjusting the grinding machine. It ensures faster and more precise machining, without requiring, as in known systems, large counterweights or springs.
  • the invention relates to a lens grinding machine, comprising one or more grinding wheels rotatably mounted around a grinding wheel axis and driven by a motor, a rocker pivotally mounted relative to a rocking axis parallel to said grinding wheel axis, a vernier , said rocker comprising gripping means for holding and rotating a lens about a lens axis, said vernier moving substantially along its longitudinal axis as a function of the angular position of said gripping means. It is characterized by a positive connection between the vernier and said rocker, the displacements of the vernier thus determining the angular position of the rocker relative to the rocker axis.
  • the rocker slides along the rocker axis and the positive link ensures the angular positioning of said rocker during movement along said rocker axis.
  • the positive connection comprises a groove-carrying part having an oblong groove in which engages a disc mounted on the rocker.
  • the disc is preferably mounted on the axis of the gripping means.
  • the disc moves in the groove-carrying part during the sliding movement of the rocker along the rocker axis.
  • the machine further comprises means for evaluating the thickness of the lens, and the movement of the vernier motor is controlled as a function of the information transmitted by said evaluation means. .
  • the vernier comprises a rod, connected by one of its ends to the rocker, a ball screw connected to the other end of the rod, and a motor capable of making turn the ball screw.
  • the motor can be mounted on the chassis of the grinding machine by a pivot connection around an axis parallel to the axes of rocker, lens or grinding wheels.
  • the end of the rod can be connected to the scale by a pivot link around a shaft fixed on said scale.
  • FIG. 1 is a schematic representation of a grinding machine of the known type.
  • the machine chassis is not shown.
  • the machine comprises a train of grinding wheels 1, driven in rotation about a grinding wheel axis 2 by a motor 3.
  • the machine furthermore comprises a rocker 4, slidably mounted (arrow 5) and pivoting (arrow 6) relative to a tilt axis 7 parallel to axis 2 of the grinding wheels.
  • This rocker 4 has gripping means 8, 9, consisting of pins capable of holding and rotating a lens 10 around a lens axis 11 parallel to the axes of grinding wheels 2 and rocker 7.
  • a disc 12 is mounted on the lens axis 11 and rotates at the same time as the latter.
  • a vernier 13 having at its end close to the disc 12 a sensitive key 14 is disposed orthogonally to the axis 2 of the grinding wheels, and is capable of moving along its longitudinal axis, under the action of a motor 15. The sensitive key 14 then comes into contact with the disc 12.
  • support means 16 constituted by a return spring urge the rocker 4 so as to bring the lens axis 11 of the lens 10 closer to the axis 2 of the grinding wheels, in the direction of the longitudinal direction of the vernier 13.
  • the support means 16 hold the lens 10 against the grinding wheel 1.
  • the key 14 of the vernier 13 comes into contact of the disc 12.
  • the machining then continues on the other points of the perimeter of the lens, until the key 14 is in contact with the disc 12 at each point of its contour.
  • FIG. 2 shows a schematic representation of a first embodiment of a grinding machine according to the invention.
  • the parts of the machine identical to those of FIG. 1 are referenced by the same numbers and their description is not repeated.
  • the grinding machine of Figure 2 has at the end of the vernier 13, not a sensitive key, but a groove holder part 17.
  • This part 17 has an oblong groove 18 in which the disc 12, mounted on the axis of lens 11, is liable to move.
  • the disc 12 is replaced by a bearing mounted on the axis.
  • the grinding machine of FIG. 2 does not have any support means 16.
  • the machine according to the invention has, thanks to the groove-carrying part 17, a positive connection between the vernier 13 driven by the motor. 15 and the rocker 4. In this way, the angular position of the rocker 4 around the rocker axis 7 is directly controlled by the position of the vernier 13.
  • the movement of the vernier 13 is controlled by a motor 15.
  • This motor is controlled, depending on the angular position of the gripping means 8, 9, and therefore in function of the angular position of the lens during machining.
  • the motor 15 of the vernier 13 is also controlled according to the form of lens to be obtained, which can be read on a frame using an appropriate device, or which can correspond to a template saved in the machine .
  • FIG. 3 shows a schematic representation of a second embodiment of a grinding machine according to the invention. Parts of the machine similar to those in FIG. 2 are referenced by the same numbers and their description is not repeated.
  • the rocker 4 only has a rotational movement around the rocker axis 7, as symbolized by the arrow 6.
  • the assembly consisting of the train of grinding wheels 1 and the grinding wheel motor 3 is however likely to move along the axis of the grinding wheels 2, as symbolized by the arrow 5 '.
  • the vernier comprises a rod 19 connected at one end to the rocker 4, by a connection pivot around a shaft 20 fixed on the rocker.
  • the other end of the rod 19 is connected to a ball screw 21.
  • the ball screw is mounted in a motor 22 capable of rotating it.
  • the motor 22 is mounted on the chassis of the grinding machine, by a pivot connection around an axis parallel to the shaft 20, and to axes 7, 11 and 2.
  • the device of FIG. 3 operates substantially like that of FIG. 2.
  • the motor 22 is controlled like the motor 15, depending on the shape of the lens to be obtained.
  • the rotation of the ball screw 21 under the action of the motor 22 leads to a variation in the length of the vernier formed by the rod 19, the screw 21 and the motor 22.
  • the distance separating the pivot link connecting the rod to the rocker and the pivot link connecting the motor 22 to the chassis varies depending on the shape of the lens to be obtained, which controls the position of the rocker 4 in its rotation around the rocker axis 7.
  • the invention thus makes it possible to eliminate all the games around the rocker axis 7, as well as rebounds, vibrations and other phenomena harmful to the machining of glass.
  • the invention allows an adjustment of the force with which the lens 10 rests on the grinding wheel 1, by controlling the respective torques of the motors 3 and 15 or 22.
  • the invention makes it possible to vary the force with which the lens rests on the grinding wheel, depending on the machining phases.
  • the load can be much greater than in known systems, without requiring a counterweight or spring.
  • the bearing force can vary depending on the phases of the machining.
  • the variation of the bearing load is advantageously modulated as a function of the thickness of the lens.
  • a device for measuring the thickness of the lens in its peripheral part is described in the aforementioned patent of the applicant.
  • This device consists of a reading station comprising two sensors forming sensors and which are applied to the faces of the lens to be machined.
  • the motor 15 or 22, which controls the position of the vernier 13 is controlled by also taking into account the information transmitted by the two probes.
  • the position of the rocker takes into account the thickness of the glass, and it is possible to load more thick glass, and to load little thin glass.
  • the lens finishing step be it bevelling or grooving, it is possible to vary the pressure of the lens on the grinding wheel according to the force to be obtained. For example, it is possible to increase the pressure and reduce the speed of rotation of the lens on the flat parts of the periphery of the lens. You can also reduce the pressure and increase the speed of rotation of the glass for angles; these controls allow a much more precise machining of the shape of the lens.
  • These controls are easily obtained according to the invention by controlling the motor 15 or 22 which determines the position of the vernier 13, and therefore by means of the positive connection, the position of the rocker 4.
  • FIG. 2 and 3 show only possible embodiments of the invention, which are capable of being easily adapted on existing grinding machines.
  • the disc or bearing 12 is not necessarily integral with the axis 11 of the lens 10, and may very well be carried by an axis offset with respect to the lens axis 11, as in the embodiment of the figure 3.
  • the part 17 does not have to have an oblong groove.
  • the oblong groove allows rotation of the rocker 4 while the vernier remains parallel to itself.
  • the thickness of the part 17 allows the axial movement of the lever without risk of loss of the positive connection between the vernier 13 and the lever 4. In the embodiment of FIG. 3, these characteristics are replaced by a tilting movement of the entire vernier 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP93403193A 1993-01-08 1993-12-28 Machine à meuler des lentilles ophtalmiques Expired - Lifetime EP0606034B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9300130 1993-01-08
FR9300130A FR2700286B1 (fr) 1993-01-08 1993-01-08 Machine à meuler des lentilles ophtalmiques.

Publications (2)

Publication Number Publication Date
EP0606034A1 EP0606034A1 (fr) 1994-07-13
EP0606034B1 true EP0606034B1 (fr) 1997-06-18

Family

ID=9442905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93403193A Expired - Lifetime EP0606034B1 (fr) 1993-01-08 1993-12-28 Machine à meuler des lentilles ophtalmiques

Country Status (6)

Country Link
US (1) US5549503A (ja)
EP (1) EP0606034B1 (ja)
JP (1) JP3504708B2 (ja)
DE (1) DE69311692T2 (ja)
ES (1) ES2104104T3 (ja)
FR (1) FR2700286B1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720021B1 (fr) * 1994-05-19 1996-08-02 Buchmann Optical Eng Machine à meuler des verres ophtalmiques comportant des moyens d'asservissement de la valeur de serrage de l'ébauche du verre à meuler.
JPH09277148A (ja) * 1996-04-17 1997-10-28 Topcon Corp レンズ周縁研削方法及びその装置
US5713784A (en) * 1996-05-17 1998-02-03 Mark A. Miller Apparatus for grinding edges of a glass sheet
JP2000015549A (ja) 1998-06-30 2000-01-18 Nidek Co Ltd 眼鏡レンズ加工装置
US20100217551A1 (en) * 2009-02-25 2010-08-26 Lonnie Calvin Goff Embedded microprocessor system for vehicular batteries
USD740949S1 (en) * 2013-09-09 2015-10-13 Essilor International (Compagnie Générale d'Optique) Ophthalmic lens edger
CN111958387B (zh) * 2020-08-10 2022-08-05 浙江维真医疗科技有限公司 一种眼镜制造用镜片边角打磨设备

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2543039B1 (fr) * 1983-03-22 1985-08-09 Essilor Int Procede pour le biseautage d'une lentille ophtalmique, et machine a meuler automatique correspondante
FR2570973B1 (fr) * 1984-10-03 1987-01-09 Briot Int Perfectionnements aux machines a meuler les verres de lunettes.
JPH01193160A (ja) * 1988-01-26 1989-08-03 Nikon Corp レンズ周縁加工機
FR2636555B1 (fr) * 1988-09-22 1994-07-29 Essilor Int Restituteur de gabarit pour machine a meuler, en particulier pour verres de lunettes
JPH04315563A (ja) * 1991-04-16 1992-11-06 Nikon Corp レンズ研削装置
FR2699445B1 (fr) * 1992-12-18 1995-03-03 Essilor Int Procédé pour le contrôle sur une meuleuse de l'adéquation, à une monture de lunettes, d'un verre à meuler.

Also Published As

Publication number Publication date
FR2700286A1 (fr) 1994-07-13
US5549503A (en) 1996-08-27
FR2700286B1 (fr) 1995-03-24
JP3504708B2 (ja) 2004-03-08
DE69311692D1 (de) 1997-07-24
DE69311692T2 (de) 1998-01-08
ES2104104T3 (es) 1997-10-01
EP0606034A1 (fr) 1994-07-13
JPH0752015A (ja) 1995-02-28

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