EP0631842A1 - Meuleuse pour verre de lunettes - Google Patents

Meuleuse pour verre de lunettes Download PDF

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Publication number
EP0631842A1
EP0631842A1 EP94401411A EP94401411A EP0631842A1 EP 0631842 A1 EP0631842 A1 EP 0631842A1 EP 94401411 A EP94401411 A EP 94401411A EP 94401411 A EP94401411 A EP 94401411A EP 0631842 A1 EP0631842 A1 EP 0631842A1
Authority
EP
European Patent Office
Prior art keywords
axis
hand
grinding wheel
touch sensor
template
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.)
Withdrawn
Application number
EP94401411A
Other languages
German (de)
English (en)
French (fr)
Inventor
Michel Nauche
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 EP0631842A1 publication Critical patent/EP0631842A1/fr
Withdrawn legal-status Critical Current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
    • 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

  • spectacle lenses are initially presented in the form of pucks, of circular, elliptical or other contour, which it is advisable to overflow by grinding to adjust them to the contour of the circles or surrounds of spectacle frames with equip.
  • this overflowing is carried out on a grinder.
  • this grinder comprises, overall, at least one grinding wheel, which is rotatably mounted on a frame, a rocker, which is pivotally mounted on the frame, around an axis parallel to the axis of rotation of the grinding wheel, a support spindle, which is rotatably mounted on the rocker around an axis also parallel to the axis of rotation of the grinding wheel, and which is adapted to receive, on the one hand, the glass to grind, and, on the other hand, a template, and, disposed directly above the template, a contact detector, which, in practice, is movably mounted on the frame, transversely with respect to the pivot axis of the rocker.
  • This contact detector which belongs to what is usually called a vernier head, forming the part of the latter with which the template cooperates, has overall responsibility for controlling operations.
  • the contact detector is subjected to control means which, in conjunction with the contour data of the circles or of the frames of spectacle frames to be fitted, control a movement of which results in pivoting in one direction or in the other of the scale to adjust accordingly, in the desired places, the overhang to be ensured.
  • the contact detector in the form of a displacement detector, for example an optoelectronic cell, and to make use of this displacement detector between, on the one hand, a key, on which is susceptible to carry by its edge the template, and, on the other hand, a plate on which the key is pivotally mounted about an axis parallel to the pivot axis of the rocker.
  • a displacement detector for example an optoelectronic cell
  • the triggering threshold of the optoelectronic cell thus implemented is very precise, and therefore difficult to adjust.
  • the inevitable mounting clearance around the articulation between the key and the plate is likely to be the source of an inaccuracy in the reference that the assembly is supposed to ensure, and, therefore, d '' a deformation for the treated spectacle lens.
  • the present invention generally relates to a grinder free of these drawbacks.
  • This grinder which is of the type concerned, is generally characterized in that the contact detector which it comprises is formed, on the one hand, by a rigid key, and, on the other hand, a tactile sensor duly reported on this rigid key, on the surface thereof.
  • the touch sensor thus implemented is a component whose resistance varies with the force applied.
  • this touch sensor acting in practice as a switch or an inverter, this touch sensor is very simple to implement, and, for this implementation, it does not require any adjustment by itself.
  • the rigid key which carries it allows obtaining a precise reference, so that any risk of deformation for the treated spectacle lens is avoided.
  • this touch sensor is advantageously insensitive to vibrations and humidity, which is particularly favorable for its use in a grinder.
  • the grinder 11 comprises at least one grinding wheel 12, which, under the control of a motor 13, is rotatably mounted on a frame not shown, along an axis of rotation A1 shown diagrammatically in broken lines in FIG. 1 , a rocker 14, which, according to the double arrow F1 of FIG. 1, is pivotally mounted on the frame around an axis A2 shown diagrammatically in broken lines in FIG.
  • a support pin 15 which is rotatably mounted on the rocker 14 around an axis A3 also shown schematically in broken lines in Figure 1 and also parallel to the axis of rotation A1 of the grinding wheel 12, and which is adapted to receive, axially, on the one hand, the spectacle lens 10 to be ground, being for example, and as shown, formed by two half-pins 15 ', 15''suitable for axially enclose between them this spectacle lens 10 previously gloved accordingly, and, on the other hand, and according to the arrangements described in more detail later, a template 16, and, placed directly above this template 16, a detector contact 17.
  • This grinder 11 is for example of the type described in the French patent which, filed on March 22, 1983 under No 83 04637, was published under No 2 543 039.
  • This grinder 11 is thus well known in itself, it will not be described in more detail here.
  • the template 16 is disposed at the end of the support pin 15, and that the contact detector 17 which is associated with it is, itself, disposed at the end of a support rod 18, which is mounted movable axially, and which, as shown diagrammatically in FIGS. 1 and 2, meshes with a rack 19 with a pinion 20 wedged on the output shaft of a motor 21.
  • this motor 21 is under the control of a control unit 27.
  • the assembly of the contact detector 17 and the support rod 18 constitutes what is usually called a vernier head.
  • the contact detector 17 is formed, on the one hand, by a rigid key 23, which is duly secured to the support rod 18, and, on the other hand, by a touch sensor 24, which is duly attached to this rigid key 23, on the surface thereof.
  • the touch sensor 24 is attached by bonding to the rigid button 23.
  • the assembly generally belongs to a cylindrical surface S of radius R equal to that of the grinding wheel 12.
  • the axis A4 of this cylindrical surface S is located in the plane containing the axis of rotation A3 of the support spindle 15 and the axis of rotation A1 of the grinding wheel 12, being, at rest, coincident with this latest.
  • the touch sensor 24 is a component whose resistance varies with the force applied to it.
  • this component is of the type of those marketed under the name "Resistance of force detection”.
  • the touch sensor 24 is mounted in series with a resistor 25 across the terminals of a power source 26, and the voltage across its terminals is applied to one of the inputs d a comparator 28, which receives on its other input a reference voltage delivered, preferably in an adjustable manner, by a resistance bridge 29, and which, by its output, controls, in practice by pulses, the control unit 27 controlling the motor 21.
  • the template 16 is a template with a circular outline.
  • the motor 21 ensures, under the control of the control unit 27, a displacement in one direction or the other of the support rod 18, and, therefore, a tilting in one direction or in the other of the rocker 14 around its axis of rotation A2, which, by the resulting modification for the engagement of the spectacle lens 10 relative to the grinding wheel 12, makes it possible to obtain the overflowing of this spectacle lens 10 according to the contour sought for it.
  • control unit 27 restores for this the shape data which are transmitted to it by a contour reading device to which is corollarily subjected the circle or frame of spectacle frame to be fitted.
  • control unit 27 controls the rotation in one direction or the other of the motor 21.
  • the touch sensor 24 acts as a switch or inverter.
  • the template 16 has an outline which, point by point, is strictly identical to that of the circle or surrounding of the spectacle frame to be fitted.
  • the contact detector 17 is in this case stationary, being for this purpose duly wedged in position by the motor 21, and, then forming a fixed stop for the template 16, it allows, as before, the latter to materially limit the engagement of the spectacle lens 10 with respect to the grinding wheel 12.
  • control unit 27 ensures, under the control of the contact detector 17, the overall control of the grinder 11, and in particular of its support spindle 15, according to one or the other of the continuous, step-by-step or reverse machining programs, provided for this grinder 11.
  • the touch sensor 24 then acts as a switch or inverter.

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)
  • Eyeglasses (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Machine Tool Copy Controls (AREA)
EP94401411A 1993-06-25 1994-06-23 Meuleuse pour verre de lunettes Withdrawn EP0631842A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9307769A FR2706800B1 (enrdf_load_stackoverflow) 1993-06-25 1993-06-25
FR9307769 1993-06-25

Publications (1)

Publication Number Publication Date
EP0631842A1 true EP0631842A1 (fr) 1995-01-04

Family

ID=9448567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401411A Withdrawn EP0631842A1 (fr) 1993-06-25 1994-06-23 Meuleuse pour verre de lunettes

Country Status (4)

Country Link
US (1) US5562527A (enrdf_load_stackoverflow)
EP (1) EP0631842A1 (enrdf_load_stackoverflow)
JP (1) JPH079318A (enrdf_load_stackoverflow)
FR (1) FR2706800B1 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59700201D1 (de) 1997-03-26 1999-07-22 Optotech Optikmasch Gmbh Verfahren und Vorrichtung zur Bearbeitung optischer Linsen
JP3049707B2 (ja) 1998-04-03 2000-06-05 花王株式会社 水蒸気発生体
JP3649902B2 (ja) 1998-04-08 2005-05-18 松下電器産業株式会社 ドームカバーの製造方法
US6325697B1 (en) 1999-11-24 2001-12-04 Glassline Corporation CNC machine tools
FR2883215B1 (fr) * 2005-03-17 2008-11-07 Essilor Int Procede d'usinage d'une face de lentille optalmique prismee au centre

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148159A (en) * 1983-10-18 1985-05-30 Essilor Int Process and apparatus for bevelling or grooving ophthalmic lenses

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798844A (en) * 1972-04-24 1974-03-26 Rigel Mfg Inc Lens grinding apparatus
US4423569A (en) * 1981-10-02 1984-01-03 Ait Industries, Inc. Automatic lens edger
FR2543039B1 (fr) * 1983-03-22 1985-08-09 Essilor Int Procede pour le biseautage d'une lentille ophtalmique, et machine a meuler automatique correspondante
FR2562829B1 (fr) * 1984-04-12 1986-06-13 Briot Int Dispositif de commande de relevage et de translation du chariot d'une machine a deborder et a biseauter les verres de lunettes
US4912880A (en) * 1985-12-06 1990-04-03 Cobain Optical Industries, Inc. Computerized tracing/edging system
FR2644718A1 (fr) * 1989-03-23 1990-09-28 Briot Internal Dispositif de reetalonnage d'une machine a meuler les verres ophtalmiques pour rattraper l'usure de la meule
US5022187A (en) * 1989-09-27 1991-06-11 Briot International Device for regulating the grinding weight for an ophthalmic glass grinding machine
FR2652775A1 (fr) * 1989-10-05 1991-04-12 Briot Int Dispositif perfectionne de reglage du poids de meulage sur une machine a meuler les verres ophtalmiques.
FR2682628B1 (fr) * 1991-10-21 1996-01-05 Buchmann Optical Eng Perfectionnements aux machines a meuler et a biseauter les verres ophtalmiques.
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.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148159A (en) * 1983-10-18 1985-05-30 Essilor Int Process and apparatus for bevelling or grooving ophthalmic lenses

Also Published As

Publication number Publication date
FR2706800B1 (enrdf_load_stackoverflow) 1995-11-03
US5562527A (en) 1996-10-08
FR2706800A1 (enrdf_load_stackoverflow) 1994-12-30
JPH079318A (ja) 1995-01-13

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