EP0391757B1 - Dispositif de réétalonnage d'une machine à meuler les verres optalmiques pour rattraper l'usure de la meule - Google Patents

Dispositif de réétalonnage d'une machine à meuler les verres optalmiques pour rattraper l'usure de la meule Download PDF

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Publication number
EP0391757B1
EP0391757B1 EP90400737A EP90400737A EP0391757B1 EP 0391757 B1 EP0391757 B1 EP 0391757B1 EP 90400737 A EP90400737 A EP 90400737A EP 90400737 A EP90400737 A EP 90400737A EP 0391757 B1 EP0391757 B1 EP 0391757B1
Authority
EP
European Patent Office
Prior art keywords
grinding wheel
grinding
standard disc
wear
jack
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
EP90400737A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0391757A1 (fr
Inventor
Michel Jean Marcel Lecerf
Jean-Pierre Marie Fernand Langlois
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.)
Briot International SA
Original Assignee
Briot International 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 Briot International SA filed Critical Briot International SA
Publication of EP0391757A1 publication Critical patent/EP0391757A1/fr
Application granted granted Critical
Publication of EP0391757B1 publication Critical patent/EP0391757B1/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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/18—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools
    • 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
    • B24B9/146—Accessories, e.g. lens mounting devices

Definitions

  • the present invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 2 (see EP-A-0 235 021).
  • a machine for grinding or trimming ophthalmic lenses usually comprises a first shaft, fixed and horizontal, on which a U-shaped carriage is mounted oscillating and sliding through its intermediate part, a second shaft parallel to the first and carrying a rotary grinding wheel, and a third shaft, parallel to the preceding ones, rotatably mounted on the ends of the branches of the carriage, divided into two parts therebetween in order to clamp between them a blank of grinding glass according to a template carried on a extension of this third tree outside said branches and resting on a key.
  • said button is mounted adjustable perpendicular to the shaft of the grinding wheel, on a rod of an actuator and secured to a position sensor connected to an electronic device for control of said cylinder.
  • This electronic device can be associated with a microprocessor having in memory the characteristics of a certain number of mounts.
  • the distance between the axis of the grinding wheel and that of a given template is a known value, but this value decreases as the progressive wear of the grinding wheel, the diameter of the ground glass increasing conversely, due to the fact that the jack imposes the theoretical spacing during the rotation of the blank.
  • the operator is thus forced to carry out manual interventions to measure this wear and carry out a new calibration of the grinder by setting the key.
  • the document EP-A-0 235 021 describes and represents a machine for grinding ophthalmic lenses which, in one of the embodiments shown in the figures comprises an adjustable support key for a template connected to a position sensor and mounted on a mechanical jack to compensate for the wear of the grinding wheel.
  • an adjustable support key for a template connected to a position sensor and mounted on a mechanical jack to compensate for the wear of the grinding wheel.
  • a disc is used. standard which is mounted on the axis in place of a rough glass to be ground, then the distance between the two axes is measured by bringing the standard disc into contact with the grinding wheel.
  • the machine comprises arithmetic means for calculating the amount of wear of the grinding wheel as a function of a measurement carried out by the measuring means, adjustment means for adjusting the center distance between the axes of the drive shafts of the grinding wheel and of the glass, and control means for controlling the adjustment means as a function of the amount of wear and thereby achieving wear correction.
  • the adjustment method proposed in this document is however difficult and time-consuming to implement, because it requires setting up a standard disc instead of a glass blank each time it is desired to carry out an operation of correction.
  • the object of the invention is to provide a method and a device making it possible to evaluate the wear of the grinding wheel in a simple and rapid manner and to automatically adjust the key to compensate for this wear by reducing the center distance to its initial value.
  • the invention provides a method for recalibrating a machine for grinding ophthalmic lenses of the type comprising an adjustable template support button connected to a position sensor and mounted on a jack controlled by an electronic device, depending on wear of the grinding wheel, in which a standard disc is fixed on one of the axes whose spacing must be checked, characterized in that the standard disc is fixed on the axis of the grinding wheel, coaxially to this one, and we measures said spacing by bringing the standard disc into contact with a finished glass.
  • the invention also provides a device for recalibrating a machine for grinding ophthalmic lenses of the type comprising an adjustable template support button connected to a position sensor and mounted on a jack controlled by an electronic device, to compensate for the wear of the grinding wheel, and which comprises a standard disc mounted on one of the two axes, the spacing of which must be measured and compensated automatically, characterized in that the standard disc is mounted on the axis of the grinding wheel, coaxially to this one.
  • the standard disc is advantageously mounted against the grinding wheel.
  • the jack is connected to a microprocessor comprising means for displaying the distance between the axes of the grinding wheel and the glass, means for controlling the jack, and adapted to automatically compensate for the difference between the value of said distance and its value. initial before wear of the grinding wheel.
  • the method and the device according to the invention allow regular recalibration of the grinding machine without having to put in place a standard disc in place of a finished glass or a glass blank, the operation of recalibration which can be carried out by simple lateral displacement of the carriage in order to bring the finished glass blank into contact with the external cylindrical surface of the standard disc, the latter being able to remain in place permanently on the axis of the grinding wheel.
  • the single figure is a schematic plan view from above of a grinding machine controlled by a microprocessor, comprising a recalibration device according to the invention.
  • a conventional grinding machine comprises a carriage 1 of general U shape, having an intermediate part 2 and two parallel wings 3.
  • the carriage 1 is mounted sliding and oscillating on a horizontal shaft 4 extending in its intermediate part 2 perpendicular to the wings 3.
  • a rotary shaft 5 in two parts, at least one of which has an extension 6 extending beyond one of the branches 3.
  • a blank 7 of a glass to be trimmed is centered and clamped between the two half-shafts 5 between the wings 3 and a template 8 is mounted, centered, on the extension 6 of the shaft 5.
  • the template 8 rests on a button 9 fixed on a rod 10 of a motor actuator 11 mounted on the frame 12 of the machine.
  • a grinding wheel 13 is mounted on a rotary shaft 14 driven by a motor (not shown).
  • the rod 10 of the jack 11 carries a cursor 15 in contact with a linear resistor 16 parallel to the rod 10, thus forming a potentiometer producing an electrical signal as a function of the position of the button 9, which is applied by conductors 17 to a electronic device 18 with microprocessor connected itself by a conductor 19 to the jack 11.
  • the grinding machine described above is known as a whole, in particular from document FR-A-2 481 635.
  • a standard disc 20 having a diameter equal to the pitch circle P of the grinding wheel 13 is mounted coaxially against the latter on the shaft 14.
  • the distance D between the axes of the shafts 5 and 14 corresponds to a given value a which is determined by the contact of the template 8 with the key 9 and is equal to the sum of the radius of the pitch circle P of the grinding wheel, that is ie the standard disc 20, and the desired radius of the glass 7 after grinding, that is to say the radius of the template 8, and it is understood that this is valid for all the spokes of the glass, or of the template.
  • the finished ground glass 7 is brought into contact with the standard disc 20.
  • the value a remains displayed by the device 21.
  • the diameter of the glass having increased the value displayed by the device 21 will be greater than a .
  • the button 9 is brought back into contact with the template 8 and the device 21 then displays the new value of D.
  • the electronic device 18 is adapted to automatically actuate the jack 11 in order to keep the button 9 in contact with the template, this device will read the new value of D and compare it with the initial value and automatically carry out the desired correction.
  • the standard disc 20 can be removably mounted on the shaft 14.

Landscapes

  • 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)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP90400737A 1989-03-23 1990-03-19 Dispositif de réétalonnage d'une machine à meuler les verres optalmiques pour rattraper l'usure de la meule Expired - Lifetime EP0391757B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8903831 1989-03-23
FR8903831A FR2644718A1 (fr) 1989-03-23 1989-03-23 Dispositif de reetalonnage d'une machine a meuler les verres ophtalmiques pour rattraper l'usure de la meule

Publications (2)

Publication Number Publication Date
EP0391757A1 EP0391757A1 (fr) 1990-10-10
EP0391757B1 true EP0391757B1 (fr) 1993-01-27

Family

ID=9379991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90400737A Expired - Lifetime EP0391757B1 (fr) 1989-03-23 1990-03-19 Dispositif de réétalonnage d'une machine à meuler les verres optalmiques pour rattraper l'usure de la meule

Country Status (4)

Country Link
US (1) US5161333A (enrdf_load_stackoverflow)
EP (1) EP0391757B1 (enrdf_load_stackoverflow)
DE (2) DE69000811T2 (enrdf_load_stackoverflow)
FR (1) FR2644718A1 (enrdf_load_stackoverflow)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4214242A1 (de) * 1991-09-05 1993-03-18 Wernicke & Co Gmbh Verfahren, block oder sauger und maschine zum bearbeiten des randes von brillenglaesern
US5454748A (en) * 1991-09-05 1995-10-03 Wernicke & Co. Gmbh Process, block for sucker or a machine for grinding or machining the edge of eyeglass lenses and a process for grinding eyeglass lenses
DE4214326A1 (de) * 1992-04-30 1993-11-04 Wernicke & Co Gmbh Vorrichtung zur randbearbeitung von brillenglaesern
FR2691663B1 (fr) * 1992-05-26 1996-10-11 Essilor Int Procede de ravivage de meules, disque et machine pour sa mise en óoeuvre.
DE4317571A1 (de) * 1992-05-26 1994-01-13 Wernicke & Co Gmbh Vorrichtung zur Bearbeitung des Randes von Brillengläsern
FR2697769B1 (fr) * 1992-11-10 1995-01-13 Buchmann Optical Eng Machine automatique pour meuler et 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.
FR2702409B1 (fr) * 1993-03-11 1995-05-05 Buchmann Optical Eng Machine à meuler les verres ophtalmiques comportant des moyens d'asservissement de la valeur de serrage de l'ébauche du verre à meuler.
DE4320934C2 (de) * 1993-06-24 1995-04-20 Wernicke & Co Gmbh Brillenglasrandschleifmaschine
FR2706800B1 (enrdf_load_stackoverflow) * 1993-06-25 1995-11-03 Essilor Int
FR2711331B1 (fr) * 1993-10-19 1996-01-26 Essilor Int Machine à déborder pour verre de lunettes.
FR2717413B1 (fr) * 1994-03-15 1996-05-15 Essilor Int Procédé pour la détermination de l'erreur de restitution d'une machine à déborder à laquelle est associé un appareil de lecture de contour, et application à l'autocalibrage de l'ensemble.
US5626511A (en) * 1994-10-03 1997-05-06 National Optronics, Inc. Combination lens edger, polisher, and safety beveler, tool therefor and use thereof
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
DE19616572C2 (de) * 1995-08-26 1998-03-26 Wernicke & Co Gmbh Verfahren und Vorrichtung zum Vermessen eines Brillengestells oder eines Brillenglases oder einer Formscheibe
US5713784A (en) * 1996-05-17 1998-02-03 Mark A. Miller Apparatus for grinding edges of a glass sheet
FR2751256B1 (fr) * 1996-07-22 1998-12-31 Briot Int Machine de meulage de verres optiques
US5683288A (en) * 1996-11-18 1997-11-04 Elision Technology Inc. Patternless edger apparatus for ophthalmic lens grinders
JP4002324B2 (ja) * 1997-07-08 2007-10-31 株式会社ニデック レンズ研削装置
JP3730410B2 (ja) * 1998-05-29 2006-01-05 株式会社ニデック 眼鏡レンズ加工装置
US6328630B1 (en) * 1998-10-05 2001-12-11 Hoya Corporation Eyeglass lens end face machining method
US6758733B2 (en) * 2002-03-13 2004-07-06 Ronald C. Wiand Two-part beveling wheel for improved positioning of bevel contours on ophthalmic lenses
JP2003300136A (ja) * 2002-04-08 2003-10-21 Hoya Corp 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
DE102013218136B3 (de) * 2013-09-11 2015-02-12 Carl Zeiss Vision International Gmbh Brillenglas-Halb- oder -Fertigfabrikat, Verfahren zu dessen Herstellung und Verfahren zum Beschichten eines Brillenglas-Halb- oder -Fertigfabrikats
CN107695825B (zh) * 2017-11-08 2023-08-25 佛山市南海东泰创展精密机械有限公司 一种玻璃磨边机及其工作方法
CN107900908A (zh) * 2017-11-17 2018-04-13 江门市江海区杰能机电科技有限公司 双面磨床的磨轮磨损检测机构
CN107756249A (zh) * 2017-11-17 2018-03-06 江门市江海区杰能机电科技有限公司 双面磨床的磨损补偿系统
CN112589592B (zh) * 2020-12-07 2022-09-30 吴通 一种将镜片加工至可适用于眼镜镜片的装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2481635A1 (fr) * 1980-04-30 1981-11-06 Briot Internal Machine automatique a meuler et biseauter les verres de lunettes
JPH0632892B2 (ja) * 1986-02-10 1994-05-02 株式会社トプコン レンズ研削装置
FR2611560B1 (fr) * 1987-03-05 1992-10-02 Briot Int Perfectionnements aux machines a meuler et a biseauter les verres ophtalmiques

Also Published As

Publication number Publication date
FR2644718B1 (enrdf_load_stackoverflow) 1994-07-13
DE391757T1 (de) 1991-03-21
DE69000811T2 (de) 1993-05-19
US5161333A (en) 1992-11-10
DE69000811D1 (de) 1993-03-11
EP0391757A1 (fr) 1990-10-10
FR2644718A1 (fr) 1990-09-28

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