EP0803325B1 - Procédé pour le meulage façonné du bord de circonférence de verres de lunettes et le cas échéant meulage de facette suivant ainsi que dispositif de meulage pour les bords de verres de lunettes - Google Patents

Procédé pour le meulage façonné du bord de circonférence de verres de lunettes et le cas échéant meulage de facette suivant ainsi que dispositif de meulage pour les bords de verres de lunettes Download PDF

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Publication number
EP0803325B1
EP0803325B1 EP97106143A EP97106143A EP0803325B1 EP 0803325 B1 EP0803325 B1 EP 0803325B1 EP 97106143 A EP97106143 A EP 97106143A EP 97106143 A EP97106143 A EP 97106143A EP 0803325 B1 EP0803325 B1 EP 0803325B1
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EP
European Patent Office
Prior art keywords
grinding
spectacle lens
pressure
radius
grinding pressure
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
EP97106143A
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German (de)
English (en)
Other versions
EP0803325A2 (fr
EP0803325A3 (fr
Inventor
Lutz Dr.-Ing. Gottschald
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.)
Wernicke and Co GmbH
Original Assignee
Wernicke and Co GmbH
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Filing date
Publication date
Application filed by Wernicke and Co GmbH filed Critical Wernicke and Co GmbH
Publication of EP0803325A2 publication Critical patent/EP0803325A2/fr
Publication of EP0803325A3 publication Critical patent/EP0803325A3/fr
Application granted granted Critical
Publication of EP0803325B1 publication Critical patent/EP0803325B1/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
    • 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
    • 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
    • B24B49/16—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 load

Definitions

  • the invention relates to a method and Spectacle lens edge grinding machine for shape grinding of the peripheral edge of glasses and for subsequent facet grinding if necessary using a spectacle lens edge grinding machine with a Spectacle lens holding shaft and one with reference movable grinding wheel controlled on the lens holding shaft.
  • the grinding pressure is as high as possible Speed of rotation of the grinding wheel set to a value which allows a spectacle lens to start from a circular one Grind the lens blank into the desired shape without that Damage or even destroy the lens.
  • a twisting of the lens blank in the lens holding shaft can occur especially when highly anti-reflective Eyeglass lenses are processed because these glasses are a special low friction compared to holding devices on the Spectacle lens holding shaft or attached blocks or suction cups exhibit.
  • the grinding pressure can be a slipping of a spectacle lens clamped in the spectacle lens holding shaft due to the Avoid grinding pressure with certainty if the grinding pressure is the largest for minus glasses Radius of the lens is set to a value that avoids this slipping, which is as the radius becomes smaller, so that overall the processing time is increased.
  • This disadvantage does not occur when grinding plus glasses, but here too it is from The lens pressure derived from the grinding pressure is not always optimal.
  • the invention is based on the problem of a method and an eyeglass lens edge grinding machine for shape grinding of the peripheral edge of spectacle lenses and for the subsequent connection if necessary To create facet loops with which a slipping into the eyeglass lens shaft clamped glasses is avoided with certainty and with which the grinding of the The peripheral edge of eyeglass lenses as quickly as possible without the risk of breakage or damage the spectacle lenses can be carried out.
  • the grinding pressure is set so that it is at a large, touching the grinding wheel Radius of the spectacle lens is just so large that the slipping into the spectacle lens holding shaft clamped glasses is just avoided, while the grinding pressure with less increasing radius and increasing margin width, but reduced when the Edge width reduced, the instantaneous grinding pressure on the one hand again from the permissible instantaneous torque exerted by the grinding pressure on the lens blank is dependent, but on the other hand may not be so large that the lens blank is damaged or even destroyed.
  • the control of the grinding pressure depending on the radius of the grinding wheel touching the grinding wheel Spectacle lenses can be refined if the grinding pressure is also dependent on the Angle between a to the respective contact point of the lens on the grinding wheel leading radius and one of the axes of rotation of the lens shaft and the grinding wheel vertically intersecting straight lines is controlled that the grinding pressure increases when the Angle - starting from said straight line as zero position - clockwise or counterclockwise increased. Because of this changing angle, not only that changes Grinding wheel contacting radius of the lens, but also the direction of action of the Grinding force changes in the sense of a reduction in the effect on the lens Torque with increasing angle.
  • the grinding pressure is between the lowest Value of approximately 30 N with a lens radius of approximately 40 mm and a maximum value of approximately 60 N with a lens radius of about 8 mm.
  • This increase can be linear or but, as already mentioned, depending on the angle between one and the current Contact point of the lens on the grinding wheel and the radius of rotation of the Eyeglass lens holding shaft and the grinding wheel intersecting straight lines and / or the Edge width of the lens in the area of the contact point of the lens on the grinding wheel modulated.
  • the amplitude of the oscillating component of the grinding pressure can be around 20% of the in Dependence on the aforementioned parameters prevailing at the point of attack Grinding pressure.
  • the frequency of the oscillating component can advantageously be approximately 50 s -1 .
  • Another advantageous possibility of modulating the grinding pressure is when Control of the grinding pressure when shaping the lens with a cylindrical Grinding wheel of one compared to the grinding pressure during the subsequent facet grinding a grinding wheel with a facet groove different maximum value of the grinding pressure is assumed, this value advantageously being set smaller during facet grinding as facet grinding is usually a final one Finishing process.
  • the maximum values of the grinding pressure and / or the rate of change of the Grinding pressure when changing the lens radius for lenses made of silicate glass be different from those made of plastic.
  • the control of the grinding pressure according to the invention is particularly simple by means of the same Perform computer that also controls the shaping of the lens.
  • An eyeglass lens grinding machine with an eyeglass lens holding shaft and one with respect to the spectacle lens holding shaft controlled by a computer by means of an electrical Actuator-adjustable grinding wheel for performing the procedure can be a displacement sensor have for the delivery of the grinding wheel with a data connection to the computer, so that the data sent from the displacement sensor to the computer in connection with the respective Angle of rotation of the lens in the computer in a control signal for controlling the grinding pressure in Depends on the radius of the lens at the point of contact between the grinding wheel and convert the lens, the control of the grinding pressure by changing of the torque applied by the actuator.
  • the change in torque can either by means of a torque-controlled servomotor or by means of a torque-controlled coupling between the servomotor and the adjustable grinding wheel be effected.
  • a magnetic powder coupling can preferably be used, since it can be transferred Torque can be controlled particularly easily depending on the voltage applied.
  • a transducer for the width of the spectacle lens is also connected to the computer and its measured values for controlling the grinding pressure in Dependence on the respective edge width in the contact point between the lens and the Grinding wheel can be used.
  • the invention is described below with reference to an embodiment shown in the drawing explained in more detail.
  • the Drawing shows a schematic side view, partly in Section, an eyeglass lens edge grinding machine according to the invention.
  • a cross slide 2 is arranged on a machine frame 1, whose slide part has 3 guide rods 4, which in Bores 5 of lugs 6 of the slide part 7 radially to one Spectacle lens holding shaft 14 with one held shape-grinding eyeglass lens blank 25 slidably mounted are.
  • the slide part 7 is on guide rails 8 for Machine frame 1 in a direction parallel to Spectacle lens holding shaft 14 and a shaft 10 for one Pre-grinding wheel 1 and a finished and / or coaxially arranged Facet grinding wheel 12 arranged.
  • the shaft 10 is supported on the slide part 3 by means of bearing supports 9 stored.
  • the grinding wheels 11, 12 and the lens blank 25 with their shafts 10, 14 are surrounded by a housing 13, the has a tub, not shown in detail below prevents coolant and abrasive debris from entering the area of the cross slide 2 arrives.
  • An angle encoder 15 is connected to the spectacle lens holding shaft 14, who is connected to a computer 16.
  • a displacement transducer 17 is arranged on the slide part 7 and takes the radial displacement of the slide part 3 with respect to the spectacle lens holding shaft 14. This displacement sensor 17 is also connected to the computer 16.
  • Circumference contour values for can be stored in a target value memory 20 the most diverse lens shapes as polar coordinates Enter and save and to control the shape grinding of the Use glasses 25.
  • a prescribable lens contour 24 is a generally circular lens blank 25 into the Spectacle lens holding shaft 14 clamped and with the pre-grinding wheel 11 brought into contact.
  • the grinding pressure that occurs results from the torque of the magnetic powder clutch 19, that by the computer 16 by giving up one to be set Torque corresponding voltage to the magnetic particle clutch 19th is produced.
  • the spectacle lens holding shaft 14 with the clamped therein Spectacle lens blank 25 is rotated in a known manner, the speed of rotation usually at 10 to 13 U / min is.
  • the angle encoder 15 transmits the computer 16 in the same Angular distances z. B. a pulse in increments of 6 °, whereby the computer 16 is caused to the associated, too grinding radius of the circumferential contour 24 via the servomotor 18 adjust.
  • the slide part 7 and thus the Grinding wheel 11 in an oscillating movement parallel to Rotation axis of the lens blank 25 offset, each on Edge of the pre-grinding wheel 11 in the opposite direction is reversed. This movement is not one shown drive for the carriage part 7 controlled is also connected to the computer 16.
  • the reversal can be arranged in the housing 13 Transducer 26, which is connected to the computer 16, trigger, this transducer 26 simultaneously the width the opposite edge of the lens blank 25 or the contour of the lens 24 measures.
  • the computer 16 can be so program that he on the magnetic powder clutch 19 Control signal that gives the grinding pressure depending on the Radius r touching the grinding wheel of the lens 24 in the sense an increase from a large radius r to a smaller one Radius r changed.
  • the grinding pressure can be increased by one Lowest value of about 30 N with a lens radius of 40 mm to a maximum value of about 60 N with a radius of Change glasses by about 8 mm.
  • the edge width of the spectacle lens 24 can be in the region the contact point on the grinding wheel 11, 12 in the sense of a Increasing the grinding pressure as the edge width increases and a reduction in size as the margin width becomes smaller are taken into account when the respective edge width is determined by means of the Transducer 26 is measured and passed to the computer 16.
  • the angle ⁇ and the respective The edge width of the lens in the grinding area can be Optimize processing speed and just that Adjust the lens to be shaped, depending on whether it is a minus lens or a plus lens and whether the spectacle lens an additional cylindrical or prismatic cut having.
  • the processing speed can be increased if necessary, if an oscillating component with an amplitude that can be around 20% of the grinding pressure is superimposed on the current grinding pressure.
  • the frequency of the oscillating component can be around 50 s -1 .
  • the grinding pressure at Shape grinding of the lens blank 25 on the pre-grinding wheel 11 compared to the grinding pressure in the subsequent fine or Facet cut on the fine grinding wheel 12 different is set, namely to a smaller grinding pressure at Fine or facet grinding in order for this Finishing step as accurate and smooth as possible To get surface.
  • This change in grinding pressure takes place when the shaped glasses 24 from the pre-grinding wheel 11 on the fine or facet grinding wheel 12 automatically and computer-controlled.
  • a Magnetic powder clutch 19 arranged because the transferable Torque particularly sensitive using a magnetic particle clutch can be adjusted.
  • the servomotor 18 generated torque by the computer 16 directly in dependence controlled by the required grinding pressure.

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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)

Claims (13)

  1. Procédé pour le meulage façonné du bord de la circonférence de verres de lunettes et le cas échéant meulage de facette suivant au moyen d'une machine à meuler les bords de verres de lunettes, comportant un arbre de support de verres de lunettes, supportant le verre de lunettes et entraíné en rotation et un disque de meulage mobile de façon commandée par rapport à l'arbre de support de verres de lunettes, dans lequel la pression de meulage est commandée, en fonction du rayon respectif et de la largeur du bord du verre de lunettes, au point de contact entre le disque de meulage et le verre de lunettes, de telle façon que la pression de meulage augmente lorsque le rayon du verre de lunettes tournant avec l'arbre de support de verre de lunettes diminue et est de ce fait réglée à une valeur maximum instantanée, pour laquelle un glissement du verre de lunettes, serré sur l'arbre de support de verre de lunettes, et une détérioration ou une destruction est évitée de façon sure.
  2. Procédé selon la revendication 1, caractérisé par le fait que la pression de meulage est commandée en fonction de l'angle entre un rayon menant au point de contact respectif du verre de lunettes avec le disque de meulage et une droite coupant perpendiculairement l'axe de rotation du disque de meulage et de l'arbre de support de verre de lunettes, de telle façon que la pression de meulage augmente lorsque l'angle augmente, à partir de ladite droite servant d'origine, dans le sens ou en sens inverse des aiguilles d'une montre.
  3. Procédé selon la revendication 1 ou 2, caractérisé par le fait que la pression de meulage varie entre une valeur inférieure d'environ 30 N pour un rayon de verre de lunettes d'à peu près 40 mm et une valeur supérieure d'environ 60 N pour un rayon de verre de lunettes d'environ 8 mm.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé par le fait qu'une composante oscillante est en outre superposée à la pression variant en fonction du rayon du verre de lunettes.
  5. Procédé selon la revendication 4, caractérisé par le fait que l'amplitude de la composante oscillante se situe à environ 20% de la pression de meulage régnant juste au point d'application.
  6. Procédé selon les revendications 4 ou 5, caractérisé par le fait que la fréquence de la composante oscillante se situe à environ 50 s-1.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé par le fait que pour la commande de la pression de meulage lors du meulage façonné d'un verre de lunettes, on part d'une valeur maximum de pression de meulage différente par rapport à la pression de meulage utilisée pour le meulage ultérieur de facettes.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé par le fait que les valeurs maxima de pression de meulage et/ou les taux de changement de pression de meulage lors d'un changement de rayon de verre de lunettes dans le cas de verres de lunettes en verre de silicate sont différents de ceux dans le cas de verres en matière plastique.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé par le fait que la commande de la pression de meulage s'effectue avec le même ordinateur qui commande le meulage à façon du verre de lunettes.
  10. Machine de meulage des bords de verre de lunettes comportant un arbre de support de verre de lunettes (14) supportant un verre de lunette (24) et un disque de meulage (11, 12), commandé par un ordinateur (16) par rapport à l'arbre de support de verre de lunettes (14) et mis en position au moyen d'un moteur électrique de réglage, pour la mise en oeuvre du procédé selon l'une des revendications 1 à 9 caractérisée par un capteur de déplacement (17) pour la mise en position du disque de meulage (11, 12) et la communication d'informations à l'ordinateur (16) pour commander la pression de meulage en fonction du rayon (r) respectif et de la largeur de bord du verre de lunettes (24) au point de contact entre le disque de meulage (11, 12) et le verre de lunettes (24), la pression de meulage étant modifiée par modification du couple transmis par le moteur de réglage (18).
  11. Machine de meulage des bords de verre de lunettes selon la revendication 10, caractérisée par le fait que le couple est modifié au moyen d'un accouplement (19) disposé entre le moteur de réglage (18) et le disque de meulage à positionner (11, 12).
  12. Machine de meulage des bords de verre de lunettes selon la revendication 11, caractérisée par le fait que l'accouplement (19) est un accouplement à poudre magnétique.
  13. Machine de meulage des bords de verre de lunettes selon l'une des revendications 10 à 12, pour la mise en oeuvre du procédé selon l'une des revendications 3 à 9 caractérisée par un capteur de valeur de mesure pour la largeur du verre de lunettes (24) et une liaison informatique vers l'ordinateur (16) pour commander la pression de meulage en fonction de la largeur de bord respective du verre de lunettes (24) au point de contact entre le verre de lunettes (24) et le disque de meulage (11, 12).
EP97106143A 1996-04-25 1997-04-15 Procédé pour le meulage façonné du bord de circonférence de verres de lunettes et le cas échéant meulage de facette suivant ainsi que dispositif de meulage pour les bords de verres de lunettes Expired - Lifetime EP0803325B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19616536A DE19616536C2 (de) 1996-04-25 1996-04-25 Verfahren und Brillenglasrandschleifmaschine zum Formschleifen des Umfangsrandes von Brillengläsern und ggf. zum anschließenden Facettenschleifen
DE19616536 1996-04-25

Publications (3)

Publication Number Publication Date
EP0803325A2 EP0803325A2 (fr) 1997-10-29
EP0803325A3 EP0803325A3 (fr) 1998-01-14
EP0803325B1 true EP0803325B1 (fr) 2002-12-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97106143A Expired - Lifetime EP0803325B1 (fr) 1996-04-25 1997-04-15 Procédé pour le meulage façonné du bord de circonférence de verres de lunettes et le cas échéant meulage de facette suivant ainsi que dispositif de meulage pour les bords de verres de lunettes

Country Status (4)

Country Link
US (1) US5993294A (fr)
EP (1) EP0803325B1 (fr)
DE (2) DE19616536C2 (fr)
ES (1) ES2188814T3 (fr)

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
JPH10138108A (ja) * 1996-10-31 1998-05-26 Nidek Co Ltd 眼鏡レンズ研削加工機及び眼鏡レンズ研削加工方法
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
JP3778707B2 (ja) * 1998-09-29 2006-05-24 株式会社ニデック 眼鏡レンズ加工装置
DE19914174A1 (de) * 1999-03-29 2000-10-12 Wernicke & Co Gmbh Verfahren und Vorrichtung zum Formbearbeiten des Umfangsrandes von Brillengläsern
SE9904705D0 (sv) 1999-12-21 1999-12-21 Astra Ab An inhalation device
JP2003340698A (ja) * 2002-05-30 2003-12-02 Hoya Corp レンズ加工装置及びレンズ加工方法
EP1445065A1 (fr) * 2003-02-05 2004-08-11 Nidek Co., Ltd. Appareil pour le traitement de lentilles ophtalmiques
DE10324146B4 (de) * 2003-05-26 2008-08-14 Weco Optik Gmbh Verfahren und Vorrichtung zum Formbearbeiten von Brillengläsern
US7715105B2 (en) * 2003-09-10 2010-05-11 Precision Optics Corporation Acylindrical optical device
US7116486B2 (en) * 2003-09-10 2006-10-03 Precision Optics Corporation, Inc. Cylindrical optical devices and method of manufacture
DE102005007523A1 (de) 2005-02-17 2006-08-24 Weco Optik Gmbh Brillenglasrandschleifmaschine
CN102725104B (zh) * 2010-01-29 2015-07-01 小岛工程有限公司 使用碟形磨石的透镜球面的磨削加工方法

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US3590532A (en) * 1968-03-06 1971-07-06 Lawrence Littlefield Lens finishing and modifying machine
US3798844A (en) * 1972-04-24 1974-03-26 Rigel Mfg Inc Lens grinding apparatus
DE2332001C3 (de) * 1972-06-28 1980-07-10 Robert Raymond Maurice Asselin Randschleifmaschine für Brillengläser
US4217736A (en) * 1973-10-11 1980-08-19 Kabushiki Kaisha Hoya Lens Method for automatically grinding lenses
DE3221713A1 (de) * 1982-06-09 1983-12-15 Wernicke & Co GmbH, 4000 Düsseldorf Brillenglasrandschleifmaschine
DE3316619A1 (de) * 1983-05-06 1984-11-08 Otto 4010 Hilden Helbrecht Schleifmaschine fuer die raender von brillenglaesern
JPS60150957A (ja) * 1984-01-14 1985-08-08 Koken:Kk レンズ加工機
JPH0796185B2 (ja) * 1988-03-18 1995-10-18 株式会社トプコン 玉摺機砥石へのレンズ定圧当接装置
JPH07100288B2 (ja) * 1989-01-18 1995-11-01 株式会社トプコン レンズ研削方法及びそのための装置
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US5148637A (en) * 1990-02-27 1992-09-22 Bausch & Lomb Incorporated Lens edging system with programmable feed and speed control
JP3011526B2 (ja) * 1992-02-04 2000-02-21 株式会社ニデック レンズ周縁加工機及びレンズ周縁加工方法
DE4320934C2 (de) * 1993-06-24 1995-04-20 Wernicke & Co Gmbh Brillenglasrandschleifmaschine

Also Published As

Publication number Publication date
DE59708973D1 (de) 2003-01-30
DE19616536A1 (de) 1997-11-06
EP0803325A2 (fr) 1997-10-29
DE19616536C2 (de) 2000-01-27
EP0803325A3 (fr) 1998-01-14
US5993294A (en) 1999-11-30
ES2188814T3 (es) 2003-07-01

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