EP0789787A1 - Dispositif pour l'usinage du bord de verres de lunettes - Google Patents

Dispositif pour l'usinage du bord de verres de lunettes

Info

Publication number
EP0789787A1
EP0789787A1 EP93909795A EP93909795A EP0789787A1 EP 0789787 A1 EP0789787 A1 EP 0789787A1 EP 93909795 A EP93909795 A EP 93909795A EP 93909795 A EP93909795 A EP 93909795A EP 0789787 A1 EP0789787 A1 EP 0789787A1
Authority
EP
European Patent Office
Prior art keywords
rotation
axis
sensor
tool
spectacle lens
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Withdrawn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
EP93909795A
Other languages
German (de)
English (en)
Inventor
Lutz 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
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 Wernicke and Co GmbH filed Critical Wernicke and Co GmbH
Publication of EP0789787A1 publication Critical patent/EP0789787A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B24B49/02—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 according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • B24B49/04—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 according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
    • 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 invention relates to a device for processing the edge of spectacle lenses according to the preamble of claim 1.
  • This known device for processing the edge of spectacle lenses has (at least) a tool which can be brought into engagement with the peripheral edge of a spectacle lens to be edged and which is arranged on a tool holder, and a clamping unit for the spectacle lens which holds the spectacle lens rotates about an axis of rotation which is approximately perpendicular to the apex of the spectacle lens, so that the entire peripheral edge can be brought into engagement with the tool in succession. Furthermore, a control unit is provided which controls the distance between the tool holder and the clamping unit (infeed) as a function of the angle of rotation ⁇ of the clamping unit about its axis of rotation.
  • the tool is generally a grinding wheel.
  • the known devices have a control unit that determines the distance between the tool holder and the clamping unit —also referred to as “infeed” - as a function of the turning angle kel ⁇ controls the clamping unit about its axis of rotation.
  • This control unit can be, for example, a so-called copy control, in which a shaped disk is scanned, the shape of which corresponds to the desired edge shape.
  • control unit which is a microcomputer, for example having.
  • the invention is based on the object of developing a device for processing the edge of spectacle lenses in accordance with the preamble of claim 1 such that the determination of the actual value of the spectacle glass dimensions is not disturbed by the current processing operation.
  • the first sensor detects an edge region of the spectacle lens opposite it, which has an angular distance ⁇ > 0 ° from the location of the tool engagement with respect to the axis of rotation and / or a linear distance in the direction of the axis of rotation.
  • the clamping unit for the spectacle lens or the tool holder is moved during processing and / or before finishing is finished in such a way that the sensor detects the distance from the edge region just processed.
  • This arrangement of the first sensor largely prevents disturbances in the measuring process due to the machining process, that is to say, for example, a grinding process with grinding liquid. It is thus possible to use non-contact sensors which, for example, measure the area of the edge opposite them with a laser beam (claim 8). Above all, however, tactile sensors can also be used in accordance with claim 4, since the point currently being worked on is exposed due to the rotation of the clamping unit and / or the relative displacement between the clamping unit and the tool holder. Tactile sensors have particularly small measurement errors in the present application and are also particularly robust.
  • the output signal of the sensor or sensors on the control unit is the actual value for the momentary egg.
  • Spectacle lens dimension The control unit can thus regulate the distance or the infeed on the basis of a target / actual comparison. This means that deviations in the dimensions of the tool, for example the grinding wheel, no longer lead to errors in the edge dimensions, since the edge dimensions are measured continuously, compared with the predetermined, stored values and, based on the comparison, the manufacturing process is regulated and no longer only is controlled.
  • the configuration according to the invention can be implemented both in devices with a so-called copy control and in devices with a numerical control:
  • the output signal of the sensor can cause an adjustment of the "transmission linkage", which can be constructed in particular in the manner of a "cranesbill".
  • the embodiment according to the invention is particularly advantageous for devices with a numerical control unit.
  • the additional effort is limited to the sensor and an interface to the microprocessor, which in particular can have an A / D converter.
  • the calculation of the correction of the infeed based on the sensor output signal can then be performed by the microprocessor which is already present. Due to the numerical control, the correction itself does not require any additional control effort.
  • the first sensor which detects the distance r of the edge region of the spectacle lens opposite it from the axis of rotation as a function of the angle of rotation ⁇ , has an angular distance ⁇ > 0 ° from the location of the tool engagement Has axis of rotation.
  • the clamping unit is then rotated at least once by the angle ⁇ during the machining process of an edge region, so that the sensor detects the distance from the edge region just processed.
  • the clamping unit or the tool carrier is shifted at least once by the distance "first sensor / tool" during the machining process of an edge region, so that the edge region just machined is detected by the first sensor.
  • the first sensor or sensors each have a finger which rests on the edge region of the spectacle lens to be detected.
  • An encoder detects the deflection of the finger from its rest position.
  • the control unit determines the actual value of r ( ⁇ ) from the output signal of the encoder.
  • the first sensor has a stationary measuring shoe or a roller as a support for the spectacle lens.
  • the spectacle lens is then moved in a direction perpendicular to the axis of rotation as it rotates about the axis of rotation of the clamping unit, the measuring shoe or the roller or the clamping unit.
  • An encoder detects the relative shift between the measuring shoe or roller and the axis of rotation of the tensioning unit as a function of the rotary winkeis ⁇ .
  • the roller can in particular be arranged on the tool carrier.
  • the control unit determines the value r ( ⁇ ) at least over a certain area of the circumference of the spectacle lens and to carry out the target / actual comparison with the values determined in this area. In this way, local measurement errors etc. are averaged out.
  • the inventive concept of regulating the machining process it is possible, according to claim 11, to provide at least one second sensor which is at an angular distance ⁇ ⁇ > 0 ° from the tool with respect to the axis of rotation.
  • the angle ⁇ can in particular be equal to the angle ⁇ .
  • this sensor detects the position of the edge region or position opposite it in the direction of the axis of rotation. From the deviation of the measured position c. -r facet from the predetermined position of the facet can at least corrective values for the processing of the next processed lens can be determined.
  • control unit determines the predetermined position of the facet from measured values of a so-called tracer, which in addition to the values r (jeattach) of the respective lens ring of the frame and its height variation z ( ⁇ ) determined.
  • the second sensor or sensors can be non-contact sensors (claim 13) or touch sensors (claim 14).
  • the first second sensor (s) has a finger which has a spherical or cylindrical front part (claim 16) and that on the edge region of the spectacle lens and in particular the facet to be detected of the spectacle lens.
  • a displacement sensor detects the displacement of the finger in the direction of the axis of rotation. This design enables accurate measurement with gentle scanning.
  • a particularly simple combination of the first and second sensors is characterized in claim 17, according to which the first sensor has an element which can be displaced perpendicular to the axis of rotation, the displacement of which is detected by a displacement sensor and which carries the second sensor.
  • the first measuring process takes place after the second rotation of the fine grinding has ended (claim 19).
  • the glass can be rotated via a hysteresis clutch or an actuator (claim 20).
  • the concept according to the invention can be used in devices with any tools, such as turning or milling tools, and not only in grinding devices (claim 21).
  • the figure shows a device for processing the edge of spectacle lenses.
  • the device has a number of tools 1 'and 1 "which in the exemplary embodiment shown are grinding tools and which are arranged on a tool carrier 2 which can be displaced in the z direction, so that the individual tools can be carried out one after the other, for example of the preliminary and fine grinding can be brought into engagement with the peripheral edge of an eyeglass lens 3.
  • the spectacle lens 3 is arranged in a clamping unit 4 which rotates the spectacle lens 3 about an axis of rotation 4 'which is approximately perpendicular to the apex of the spectacle glasses, so that the entire peripheral edge can be brought into engagement with the respective tool 1 in succession is.
  • a control unit 5 controls the distance x tool carrier / clamping unit (infeed) as a function of the angle of rotation ⁇ of the clamping unit 4 about its axis of rotation 4 '. For this purpose, it moves the tool carrier 2 in the x direction in the exemplary embodiment shown.
  • a sensor unit with a first sensor is also provided.
  • the sensor has a roller 6, which is arranged on the tool carrier 2, as a support for the spectacle lens.
  • the tool carrier 2 is first shifted in the direction of its axis of rotation, so that the spectacle lens 3 comes into contact with the roller 6.
  • the spectacle lens then moves the roller 6 relative to the clamping unit 4 in the direction x perpendicular to the axis of rotation as it rotates about the axis of rotation 4 'of the clamping unit 4.
  • An encoder 7 for detecting the spectacle lens dimension r ( ⁇ ) detects the displacement of the tool carrier 2 and thus the relative displacement between the roller 6 and the axis of rotation 4 'of the clamping unit 4 as a function of the angle of rotation ⁇ .
  • the output signal of the encoder is applied to the control unit 5, which determines the actual value of r ( ⁇ ) from the output signal of the encoder, and controls the relative shift between the tool holder and the clamping unit accordingly.
  • a sensor 7 'can also be provided, which detects an edge region of the spectacle lens lying opposite it and which has an angular distance ⁇ ⁇ > 0 ° from the location of the tool engagement with respect to the axis of rotation 4 1 of the clamping unit 4.

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)

Abstract

Un dispositif d'usinage du bord de verres de lunettes comprend au moins un outil qui peut être mis en contact avec le bord circonférentiel d'un verre de lunettes et qui est monté sur un porte-outil; une unité de serrage pour verre de lunettes qui met le verre de lunettes en rotation autour d'un axe de rotation qui traverse perpendiculairement le sommet du verre de lunettes, de sorte que tout le bord circonférentiel du verre de lunettes puisse être successivement mis en prise avec l'outil; une unité de commande de l'écartement entre le porte-outil et l'unité de serrage (avance) en fonction de l'angle de rotation Ζ de l'unité de serrage autour de son axe de rotation; et un ensemble capteur comprenant au moins un premier capteur qui mesure l'écartement r entre la zone marginale qui lui fait face et l'axe de rotation en fonction de l'angle de rotation Ζ, et dont le signal de sortie est appliqué à l'unité de commande en tant que valeur réelle des dimensions du verre de lunettes. L'unité de commande règle l'avance en fonction d'une comparaison entre les valeurs de référence et réelle. Le dispositif décrit se caractérise par le fait que le premier capteur mesure une zone marginale du verre de lunettes qui lui fait face et qui présente depuis le point de contact de l'outil un écartement angulaire α<> 0° par rapport à l'axe de rotation et/ou un écartement linéaire dans la direction de l'axe de rotation. L'unité de serrage du verre de lunettes ou le porte-outil sont déplacés pendant l'usinage et/ou avant que le polissage fin ne soit achevé de sorte que le capteur mesure l'écartement de la zone marginale qui vient d'être usinée.
EP93909795A 1992-05-26 1993-05-26 Dispositif pour l'usinage du bord de verres de lunettes Withdrawn EP0789787A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4217433 1992-05-26
DE4217433 1992-05-26
DE4218477 1992-06-04
DE4218477 1992-06-04
PCT/DE1993/000461 WO1993024273A1 (fr) 1992-05-26 1993-05-26 Dispositif d'usinage du bord de verres de lunettes

Publications (1)

Publication Number Publication Date
EP0789787A1 true EP0789787A1 (fr) 1997-08-20

Family

ID=25915177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93909795A Withdrawn EP0789787A1 (fr) 1992-05-26 1993-05-26 Dispositif pour l'usinage du bord de verres de lunettes

Country Status (2)

Country Link
EP (1) EP0789787A1 (fr)
WO (1) WO1993024273A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19527222C2 (de) * 1995-07-26 1997-09-04 Wernicke & Co Gmbh Anlage zum Schleifen wenigstens des Umfangsrandes von Brillengläsern und Verfahren zum rechnerischen Berücksichtigen der Position eines an einem Haltekopf der Anlage gehaltenen Brillenglasrohlings
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841033A (en) * 1972-06-27 1974-10-15 Goodyear Tire & Rubber Tire manufacturing
GB2123723A (en) * 1982-01-19 1984-02-08 Ntn Toyo Bearing Co Ltd Method of manufacturing bearing unit for automobile wheel
DE128110T1 (de) * 1983-06-07 1985-09-26 United Technologies Corp., Hartford, Conn. Verfahren und einrichtung zum schleifen von turbinenlaeufern.
JPS629858A (ja) * 1985-03-29 1987-01-17 Tokyo Optical Co Ltd レンズ研削装置
IE67140B1 (en) * 1990-02-27 1996-03-06 Bausch & Lomb Lens edging system
DE4012660A1 (de) * 1990-04-20 1991-10-24 Wernicke & Co Gmbh Verfahren zum bearbeiten der raender von brillenglaesern

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9324273A1 *

Also Published As

Publication number Publication date
WO1993024273A1 (fr) 1993-12-09

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