EP0995549B1 - Procédé pour l'étalonnage d'une meuleuse pour lentille ophtalmique, et calibre d'étalonnage propre à sa mise en oeuvre - Google Patents

Procédé pour l'étalonnage d'une meuleuse pour lentille ophtalmique, et calibre d'étalonnage propre à sa mise en oeuvre Download PDF

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Publication number
EP0995549B1
EP0995549B1 EP99402590A EP99402590A EP0995549B1 EP 0995549 B1 EP0995549 B1 EP 0995549B1 EP 99402590 A EP99402590 A EP 99402590A EP 99402590 A EP99402590 A EP 99402590A EP 0995549 B1 EP0995549 B1 EP 0995549B1
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EP
European Patent Office
Prior art keywords
calibration template
machining tool
tool
contact
calibration
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
EP99402590A
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German (de)
English (en)
French (fr)
Other versions
EP0995549A1 (fr
Inventor
Christophe Sillon
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
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Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Publication of EP0995549A1 publication Critical patent/EP0995549A1/fr
Application granted granted Critical
Publication of EP0995549B1 publication Critical patent/EP0995549B1/fr
Anticipated expiration legal-status Critical
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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

Definitions

  • the present invention relates generally to calibration which must be started with a lens grinder ophthalmic, to know, with all the rigor desirable, in relation to its general reference frame, various parameters relating to the machining tools which are likely to be used there, and, in particular, the position of such a tool machining in this coordinate system, it being understood that this calibration can, then, and even must be periodically renewed, in particular on the occasion of changing this machining tool or sharpening it.
  • the grinder to be calibrated comprises, overall, a rocker, which is pivotally mounted on a frame, a tree glass holder, which is rotatably mounted on the rocker around a parallel axis of rotation to the pivot axis thereof, and a tool-holder shaft, which is carried by the frame, at distance from the pivot axis of the scale, and on which a tool can be mounted machining.
  • the detection carried out takes place at a distance from the tree glass holder and tool holder shaft, following a lower lever arm than these two trees, and, therefore, at the expense of the accuracy of the results obtained.
  • this creasing tool is used on a tool shaft secondary, which, distinct from the main tool shaft carrying one or more grinding wheels, extends parallel to it, this secondary tool-holder shaft being for example constituted by a simple pin which extends in overhang to from a specific retractable frame.
  • this creasing tool is a simple grinder relatively thin and narrow.
  • the present invention generally relates to a provision which makes it possible to avoid these disadvantages, and which, in particular, when it is the calibration of a creasing wheel, allows, by a development, avoid any deformation of this creasing wheel.
  • the subject of the present invention is first of all a method for calibrating a grinder comprising a scale, which is pivotally mounted on a frame, a glass holder shaft, which is rotatably mounted on the rocks around an axis of rotation parallel to its pivot axis, and on which can be mounted a calibration gauge, and a tool shaft, which is rotatably mounted on the frame, away from the pivot axis of the rocker, and on which can be mounted a machining tool,
  • this method being of the type comprising a docking phase during which the scale, equipped with a caliber calibration, is brought closer to the tool-holder shaft, equipped with a tool of machining, and being generally characterized that one interrupts this docking phase as soon as an electrical contact is detected between the rating and the machining tool, the latter being chosen to conduct electricity.
  • the detection is done, no longer between the rocker and the return link that controls it, but directly between the caliber tool and the machining tool, without the intervention of any leverage, and therefore benefit from the precision of the results obtained.
  • a calibration gauge having, itself, at least on the surface, at least one conductive part, which is insulated, and which is electrically connected to a circuit operation, and the interruption of the docking phase is subjected to detection, by this operating circuit, a current flow between the conductive part of the calibration gauge and the machining tool.
  • the phase is interrupted as soon as the intensity of the current detected by the operating circuit reaches a determined threshold.
  • the electrical detection thus carried out saves advantageously to the creasing tool, and, just as well, to the caliber calibration, any accentuated mechanical contact likely to cause a any deformation.
  • the calibration gauge preferably used for the application of the method according to the invention comprises at least part conductive, which is electrically isolated, and which is likely to be electrically connected to any operating circuit.
  • Such a calibration gauge, and the corresponding calibration method can be advantageously suitable both for the calibration of a grinding wheel and for the calibration of a creasing wheel.
  • the calibration gauge according to the invention preferably comprises at least two conductive parts, which are isolated from each other, and which each comprise at least one contact face forming a dihedral with the contact face of the other, and, after a contact has was detected between the contact face of one of these conductive parts and the machining tool, in this case the creasing wheel, so that a contact is also established between this machining tool and the contact pan of the other of these conductive parts.
  • the calibration gauge according to the invention allows, not only to know the position of the creasing wheel in the frame of the grinder, but also the diameter of this creasing wheel then even that, given the inclination thereof, it does not grasp physically than an elliptical contour for this creasing wheel.
  • a grinder 10 for the calibration of which is more particularly intended the invention comprises, overall, a rocker 11, which is freely mounted pivoting on a frame, not shown, around a pivot axis A1 which is in practice a horizontal axis, a glass-holder shaft 12, which is mounted rotatable on the rocker 11, around an axis of rotation A2 parallel to the axis of pivoting A1 thereof, and a tool-holder shaft 13, 13 ', which is rotatably mounted on the frame, at a distance from the pivot axis A1 of the rocker 11, and on which can be mounted a machining tool 14, 14 '.
  • a automatic grinder 10, commonly known as digital, scale 11 is piloted by a return link 16 which, at its other end, is articulated to a nut 17 along a pivot axis A3 parallel to the axis of pivoting A1 of the rocker 11, and the nut 17 is itself movably mounted along an axis A4 orthogonal to the preceding pivot axes A1 and A3.
  • the nut 17 is a threaded nut in screw connection with a threaded rod 18 which, aligned according to the axis A4, is rotated by a motor 19.
  • the glass-holder shaft 12 is formed of two pins 20, which, aligned with each other, are suitable for clamping between them the glass 22 to be machined, in this case an ophthalmic lens.
  • the tool machining 14 implemented is a grinding wheel.
  • the axis of rotation A5 of the corresponding tool holder shaft 13 extends parallel to the pivot axis A1 of the rocker 11 and to the axis of rotation A2 of the glass holder shaft 12.
  • the tool machining 14 'used is a creasing tool.
  • this tool machining 14 ' is a simple creasing wheel, i.e. a disc relatively thin and narrow metal.
  • the corresponding angle of inclination l is of the order of 15 °.
  • the tool-holder shaft 13 ' is a single spindle that extends cantilevered from an auxiliary frame 24, and this auxiliary frame 24, which, in service, overhangs the machining tool 14, in being linked in translation to the carriage carrying the latter, is retractable by in relation to this machining tool 14.
  • a calibration caliber 25 for calibrating the grinder 10, it is used on the glass holder shaft 12, instead of a glass 22, a calibration caliber 25, and the corresponding calibration process includes a docking phase during which the scale 11 thus equipped with this calibration caliber 25 is close to the tool-holder shaft 13, 13 'concerned, equipped, for its part, with the tool machining 14, 14 'corresponding.
  • a calibration caliber 25 having, at less on the surface, at least one conductive part 26A, 26B, which is electrically isolated, and which, as shown diagrammatically in FIG. 9, is susceptible to be electrically connected to any operating circuit 27.
  • a calibration gauge 25 is chosen comprising at least two conductive parts 26A, 26B, which are insulated relative to each other, and which each comprise at least one section of contact 28A, 28B forming a dihedral D with the contact face 28B, 28A of the other.
  • these two conductive parts 26A, 26B each have a flange 29A, 29B, by which they are one and the other attached, at a distance from each other, on a hub 30, and opposite from which their contact face 28A, 28B extends generally at right angles.
  • the hub 30 is made of insulating material.
  • the flange 29B of the conductive part 26B is secured to the flange 31 by screws not shown.
  • the flange 29A of the conductive part 26A is itself secured to this flange 31 by screws also not shown.
  • the hub 30 carries, door to false, at one of its ends, for its coupling to the glass holder shaft 12, and, more precisely, to one of the pins 20 constituting this shaft glass holder 12, a socket 33 of electrically conductive material.
  • this socket 33 is metallic.
  • a notch 35 allows the rotation 33 of the bushing 33 on the pin 20 concerned with the glass-holder shaft 12, and a screw 36 allows its axial support with respect thereto.
  • the flanges 29A, 29B of the conductive parts 26A, 26B are parallel to each other, and they extend substantially perpendicular to the axis A6 of the hub 30.
  • their contact face 28A, 28B is planar.
  • the contact face 28A of the conductive part 26A belongs to a boss 38A which extends to the back of the flange 29A, in line with a spout 39A formed by the latter.
  • the contact face 28B of the conductive part 26B belongs to him, in this embodiment, to a simple return to square 38B of the flange 29B of this conductive part 26B.
  • the dihedral D thus formed by the contact face 28A of one of the conductive parts 26A, 26B, in this case the conductive part 26A, with the contact face 28B corresponding to the other of these conductive parts 26A, 26B, in this case the conductive part 26B, is a right dihedral.
  • this dihedral D is substantially equal to 90 °.
  • the conductive parts 26A, 26B comprise, each, at an angular distance from each other, at least three sections of contact 28A, 28'A, 28 "A, 28B, 28'B, 28" B, and one of these parts conductive 26A, 26B to the other, these contact faces 28A, 28'A, 28 "A, 28B, 28'B, 28 "B are associated in pairs of two contact faces 28A-28'A, 28B-28'B, 28 "A-28” B forming a dihedral D, D ', D "between them.
  • the contact faces 28'A, 28 "A each belong to a 40'A, 40 "A square return respectively flange 29A.
  • the contact faces 28'B, 28 "B each belong to bosses 40'B, 40 "B respectively extend to the back of the flange 29B.
  • the contact faces 28A, 28'A, 28 "A of the conductive part 26A are directed towards the conductive part 26B, and, likewise, the contact faces 28B, 28'B, 28 "B of this conductive part 26B are directed towards the part conductor 26A.
  • the sides of contact 28A, 28'A, 28 "A, 28B, 28'B, 28" B are angularly separated one on the other by an angle substantially equal to 90 °.
  • the conductive parts 26A, 26B are made one and the other in metal, and, in the central zone of their flange 29A, 29B, they comprise a bore 42A, 42B, for their engagement on the hub 30.
  • the bore 42A of the part conductive 26A is surrounded, on the side opposite to the conductive part 26B, by a collar 43.
  • the outside contour of the next calibration caliber 25 the invention locally forms two angular points 44A, 44B, which each belong respectively to its two conductive parts 26A, 26B, and which, circumscribed by the same circumference C, as shown schematically in broken lines in Figure 4, are angularly separated one of the other.
  • the tip angular 44A of the conducting part 26A belongs to the spout 39A of its flange 29A, and the angular tip 44B of the conductive part 26B belongs to a spout 39B which locally extends its boss 40 "B.
  • 25 according to the invention is, on at least part 45 of its periphery, circular.
  • the part 45 thus circular of this outer contour is limited to the edge of the spout 39A of the flange 29A of the conductive part 26A.
  • the circuit 27 includes a microprocessor 46, one of the doors 47A is connected to the conductive part 26A of the calibration gauge 25 by a electrical conductor 48A, and of which another door 47B is, so similar, connected to the conductive part 26B of this calibration gauge 25 by an electrical conductor 48B.
  • the microprocessor 46 receives, from a bus bar 49, a determined voltage, of the order for example of 5 V, by through a current limiting resistor 50A, 50B.
  • the microprocessor 46 is able to drive the grinder 10, by controlling, in particular, the pivoting of its rocker 11 around its pivot axis A1, and the rotation of its glass-holder shaft 12 around its axis of rotation A2.
  • this microprocessor 46 is wired so as to be able to discriminate if, on each of its doors 47A, 47B, the voltage is zero or if it is equal at the bus bar 49 voltage.
  • the docking phase that the corresponding calibration process as soon as contact is detected between the calibration gauge 25 and the machining tool 14 '.
  • advantage is taken, in order to do this, according to the invention, of the fact that the machining tool 14 'is, at least on the surface, conductive of electricity.
  • the creasing wheel constituting this machining tool 14 ' is usually made of metal.
  • the tool machining 14 ' is grounded; in practice it is the same for the socket 33 carried by the hub 30 of the calibration gauge 25.
  • the interruption of the approach phase of the calibration to detection process by the circuit operating 27, of a current passage between the conductive part 26A, 26B of calibration gauge 25 and the machining tool 14 '.
  • this detection is ensured by the microprocessor 46 of the operating circuit 27, by the discrimination of voltage carried out on one and / or the other of its doors 47A, 47B.
  • the interruption of the docking phase as soon as the current intensity thus detected by the circuit 27 reaches a certain threshold.
  • the voltage on the door 47A, 47B corresponding microprocessor 46 passes voltage across the bar bus 49 to ground, which allows the desired detection.
  • the two conductive parts 26A, 26B of the calibration gauge 25 each have, angularly at a distance, one of the other, at least three contact faces 28A, 28'A, 28 "A, 28B, 28'B, 28" B associated in pairs from one of these conductive parts 26A, 26B to the other, we repeat the operations for each pair 28A-28B, 28'A-28'B, 28 "A-28” B from contact faces 28A, 28'A, 28 "A, 28B, 28'B, 28" B.
  • these positioning coordinates take into account, on the one hand, the angular orientation of the rocker 11, and, on the other hand, that of the glass holder shaft 12.
  • this machining tool 14 ′ is a tool creasing mounted on a tool-holder shaft 13 'whose axis of rotation A'5 is inclined relative to the axis of rotation A2 of the glass-holder shaft 12
  • the grinder 10 When the grinder 10 is equipped with a machining tool 14, in this case one or more grinding wheels, its calibration is done using angular points 44A, 44B and part 45 of circular outline of the periphery of the caliber 25, according to modalities of the type described in the patent French No 95 06 239.

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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)
  • Eyeglasses (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP99402590A 1998-10-22 1999-10-20 Procédé pour l'étalonnage d'une meuleuse pour lentille ophtalmique, et calibre d'étalonnage propre à sa mise en oeuvre Expired - Lifetime EP0995549B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9813242A FR2784919B1 (fr) 1998-10-22 1998-10-22 Procede pour l'etalonnage d'une meuleuse pour lentille ophtalmique, et calibre d'etalonnage propre a sa mise en oeuvre
FR9813242 1998-10-22

Publications (2)

Publication Number Publication Date
EP0995549A1 EP0995549A1 (fr) 2000-04-26
EP0995549B1 true EP0995549B1 (fr) 2004-04-14

Family

ID=9531859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99402590A Expired - Lifetime EP0995549B1 (fr) 1998-10-22 1999-10-20 Procédé pour l'étalonnage d'une meuleuse pour lentille ophtalmique, et calibre d'étalonnage propre à sa mise en oeuvre

Country Status (6)

Country Link
US (1) US6327790B1 (ja)
EP (1) EP0995549B1 (ja)
JP (1) JP4468520B2 (ja)
DE (1) DE69916394T2 (ja)
ES (1) ES2218967T3 (ja)
FR (1) FR2784919B1 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4429535B2 (ja) * 2001-02-06 2010-03-10 株式会社トプコン レンズ形状測定装置
DE10304430B3 (de) * 2003-02-04 2004-09-23 Oerlikon Geartec Ag Verfahren zum Kalibrieren einer Schleifmaschine
FR2860888B1 (fr) * 2003-10-10 2006-03-17 Briot Int Procede d'etalonnage d'une machine de percage de verres ophtalmiques, dispositif pour la mise en oeuvre d'un tel procede, et appareil d'usinage de verres opthalmiques equipe d'un tel dispositif.
FR2893523B1 (fr) * 2005-11-21 2008-01-18 Essilor Int Methode d'etalonnage d'une meuleuse et dispositif correspondant
JP5500583B2 (ja) * 2009-09-30 2014-05-21 株式会社ニデック 眼鏡レンズ加工装置
JP5500579B2 (ja) * 2009-09-30 2014-05-21 株式会社ニデック 眼鏡レンズ加工装置の較正用センサユニット
JP5500584B2 (ja) * 2010-03-02 2014-05-21 株式会社ニデック 眼鏡レンズ加工装置
CN106181669B (zh) * 2016-08-04 2018-09-21 岑溪市藤超机械有限公司 磨边机磨边随动装置
CN110480509B (zh) * 2019-09-07 2020-10-09 广州瞳鑫邈视光电有限公司 一种机头驱动机构

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2611560B1 (fr) * 1987-03-05 1992-10-02 Briot Int Perfectionnements aux machines a meuler et a biseauter les verres ophtalmiques
FR2734505B1 (fr) * 1995-05-24 1997-08-01 Essilor Int Gabarit de calibrage pour l'etalonnage d'une meuleuse pour lentille ophtalmique, et procede d'etalonnage correspondant
US5683288A (en) * 1996-11-18 1997-11-04 Elision Technology Inc. Patternless edger apparatus for ophthalmic lens grinders
US6071176A (en) * 1998-10-29 2000-06-06 Gerber Coburn Optical, Inc. Gauge for and method of calibrating a lens cutting/grinding machine

Also Published As

Publication number Publication date
FR2784919A1 (fr) 2000-04-28
JP4468520B2 (ja) 2010-05-26
DE69916394T2 (de) 2004-09-09
EP0995549A1 (fr) 2000-04-26
US6327790B1 (en) 2001-12-11
ES2218967T3 (es) 2004-11-16
DE69916394D1 (de) 2004-05-19
JP2000127015A (ja) 2000-05-09
FR2784919B1 (fr) 2001-02-09

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