WO1999022906A1 - Device for measuring a former - Google Patents

Device for measuring a former Download PDF

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Publication number
WO1999022906A1
WO1999022906A1 PCT/EP1998/006786 EP9806786W WO9922906A1 WO 1999022906 A1 WO1999022906 A1 WO 1999022906A1 EP 9806786 W EP9806786 W EP 9806786W WO 9922906 A1 WO9922906 A1 WO 9922906A1
Authority
WO
WIPO (PCT)
Prior art keywords
spectacle lens
holding shaft
lens holding
grinding
shoe
Prior art date
Application number
PCT/EP1998/006786
Other languages
German (de)
French (fr)
Inventor
Lutz Gottschald
Original Assignee
Wernicke & 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 & Co. Gmbh filed Critical Wernicke & Co. Gmbh
Publication of WO1999022906A1 publication Critical patent/WO1999022906A1/en

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/401—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes
    • 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
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/36—Nc in input of data, input key till input tape
    • G05B2219/36369—Measuring object, spectacle glass, to derive position data

Definitions

  • the invention relates to a device for measuring a shaped disk in a CNC-controlled
  • Spectacle lens edge grinding machine with a computer for controlling the spectacle lens edge grinding machine, at least one grinding wheel in a grinding chamber and an angle-coded rotatable, relative to the grinding wheel radially and axially adjustable spectacle lens holding shaft.
  • Such a device in connection with a CNC-controlled spectacle lens edge grinding machine is described, for example, in German Offenlegungsschrift 34 10 040.
  • This known spectacle lens edge grinding machine has a rotatable grinding wheel fixedly arranged on a base plate in a grinding chamber, while a radially and axially adjustable spectacle lens holding shaft is arranged in a frame above the grinding wheel.
  • a circular disk is arranged which rests on a shoe which is height-adjustable by means of a servo motor.
  • This shoe can be adjusted by means of the servo motor in such a way that the distance of the spectacle lens holding shaft from the grinding wheel changes during the grinding process in accordance with the circumference of the spectacle lens to be shaped.
  • the shape data of the spectacle lens to be ground are stored in a computer for controlling the spectacle lens edge grinding machine.
  • the shaped disk is clamped in the eyeglass lens holding shaft instead of an eyeglass lens and placed on the stationary grinding disk. If the lens holder shaft is rotated, the changes Distance of the lens holder shaft from the grinding wheel in accordance with the shape of the shaped wheel.
  • the feeler shoe attached to the circular disc at the end of the lens holding shaft follows this movement and delivers radius values (r n ) to the computer which, in conjunction with the corresponding ones
  • Angle (p n ) of the spectacle lens holding shaft which are picked up by an angle encoder, form the data quantity of the shape data of the shaping disk, which can be used for the subsequent shaping of an eyeglass lens.
  • Eyeglass lens holding shaft which is different from the block or suction cup with which an eyeglass lens is inserted into an eyeglass lens holding shaft, it is necessary for the insertion of the shaped disc in the
  • Spectacle lens holding shaft to provide a special holder that fits on the one hand to the shaped disc and on the other hand corresponds to the receptacle for a conventional block or suction cup on the spectacle lens holding shaft.
  • the shaped wheel lies on the stationary grinding wheel during measurement, so that it is ground off when turning, which affects the accuracy of the measurement.
  • This wear and tear, since the shaped disks are generally made of plastic, can also result in area-wise smearing of the grinding disk, as a result of which the subsequent grinding process of a spectacle lens is impaired.
  • a device for measuring a spectacle frame or a spectacle lens or a shaped disk is also described, which is also integrated in a CNC-controlled spectacle lens edge grinding machine and in which a fixed probe shoe is located within the grinding chamber is arranged. To measure a shaped disc, it is clamped into the spectacle lens holding shaft in the grinding chamber, placed on the probe shoe and set in rotation.
  • encoders already present in the machine for controlling the grinding of a spectacle lens record the radius and angle values of the shaped disk and this amount of data is stored in the computer of the spectacle lens edge grinding machine and used for grinding a spectacle lens.
  • This device has proven itself in operation, since it can be used not only for measuring a shaped disc, but also for measuring a spectacle frame or a spectacle lens, but requires a special holder for the shaped disc when it is inserted into the spectacle lens holding shaft. Furthermore, with this device, an adaptation of the program for CNC control of the grinding process is necessary in order to be able to use the encoders available for this purpose to record the radius and angle values.
  • the invention is based on the problem of providing a CNC-controlled spectacle lens edge grinding machine with a simple device for measuring a shaped disc, which can be modified without any special changes
  • Eyeglass lens edge grinding machine and can be used in their control program.
  • a device for measuring a shaped wheel in a CNC-controlled spectacle lens edge grinding machine with a computer for controlling the spectacle lens edge grinding machine, at least one grinding wheel in a grinding chamber and an angle-coded rotatable and radially and axially adjustable spectacle lens holding shaft relative to the grinding wheel is proposed in the case of the invention for measuring a shaped disc, the spectacle lens holding shaft can be locked radially and axially, an angle encoder for receiving the
  • Spectacle lens holding shaft arranged, angled holder for a shaped disc and a fitting to the shaped disc radially displaceable probe shoe with a displacement sensor for recording the radius values (r n ) of the shaped disk are provided with respect to the spectacle lens holding shaft.
  • the end of the spectacle lens holding shaft which is led out of the grinding chamber has a customary receptacle for the angular fastening of a shaped disk.
  • a contact shoe which is radially displaceable with respect to the spectacle lens holding shaft, is in contact with the shaped disk arranged on this receptacle, the displacement sensor of which records the radius values (r n ) of the shaped disk, while at the same time the associated sensors are used by means of an angle transmitter
  • Angle of rotation (p n ) of the lens holder shaft are recorded.
  • the feeler shoe can preferably be arranged on a carriage and the carriage on one
  • Glasses edge grinding machine attached guide slide preferably a ball guide for the carriage can be provided to reduce friction.
  • This ball guide runs on a ball guide rod, and the slide can be secured against tipping by a guide rail on the slide parallel to the ball guide rod and at least one slide roller supported on the guide rail on the carrier for the ball guide rod.
  • the displacement sensor can advantageously consist of a toothed rack on the slide and an encoder on the carrier which engages with the toothed rack.
  • the feeler shoe If the feeler shoe is acted upon by means of spring force m in the direction of the spectacle lens holding shaft, it can be moved by hand m to a position radially distant from the spectacle lens holding shaft and preferably fixed in this position by means of a detent, so that a convenient placement and removal of a shaped plate is possible in this position .
  • Fig. 1 is a schematic front view of a
  • Spectacle lens edge grinding machine with the device according to the invention arranged thereon for measuring a shaped disk
  • Fig. 2 is a detailed view, partly in section, of the device according to the invention in plan view and
  • Fig. 3 is a side view of the invention
  • the spectacle lens edge grinding machine shown in FIG. 1 has a housing 1 with a grinding chamber 2, in which a pre-grinding wheel 4 with a cylindrical circumference and two facet grinding wheels 5, 6 with different facet grooves are arranged on a shaft 3.
  • a spectacle lens holding shaft composed of two halves 7, 8, of which the half shaft 7 can be axially displaced by means of a handle 9 in order to clamp a raw glass (not shown).
  • the grinding chamber 2 is during the grinding process by means of a not shown Hinged lid closed.
  • the shaft 3 is set in rapid rotation with the grinding wheels 4, 5, 6, while the raw glass held by the spectacle lens holding shaft 7, 8 rotates slowly.
  • the distance between the spectacle lens holding shaft 7, 8 and the shaft 3 with the grinding wheels 4, 5, 6 is controlled by a computer 10, in which control data for grinding the raw lens corresponding to the shape of a selected spectacle frame are stored.
  • An input keyboard 11 and a screen 12 are also arranged on the housing 1. Using the input keyboard 11, stored spectacle lens contours can be called up in a known manner and sent to the control of the spectacle lens edge grinding machine for processing the spectacle lens.
  • the input keyboard 11 for example the pupil distance, the axial position of a cylindrical or prismatic cut of the spectacle lens or the position of a close-up part.
  • a screen 12 serves to display the entered data. Furthermore, the circular raw glass and / or a spectacle lens ground according to the entered data can be displayed on the screen 12.
  • One end 14 of the half shaft 8 is led out laterally on the housing 1. At this end 14 there is a receptacle in the form of pins 15, 16 with different diameters for a shaped disk 17.
  • the shaped disk 17 has corresponding holes with a corresponding diameter, so that they can only be attached to the led out end 14 of the half shaft 8 in a certain angular position.
  • a feeler shoe 18 lies against the outer circumference of the shaped disk 17.
  • This tactile shoe 18 is fastened to a slide 19 which is radially movable with respect to the spectacle lens holding shaft 7, 8. 2 and 3, the carriage 19 is provided with a ball guide 20 through which a ball guide rod 21 is guided.
  • This ball guide rod 21 is fastened to a carrier 24, which in turn is screwed onto the housing 1 of the spectacle lens edge grinding machine.
  • a compression spring 22 is arranged concentrically to the ball guide rod 21, which is supported on the one hand on the carrier 24 and on the other hand on the slide 19 and the feeler shoe
  • a guide rail 23 is arranged on the slide 19 parallel to the ball guide rod 21, on which a guide roller 25, which is fastened to the carrier 24, is supported. Furthermore, a rack 26 is attached to the slide 19, which meshes with a gear on a carrier-fixed encoder 27, so that the encoder 27 serves as a displacement sensor for the radial movement of the feeler shoe 18 when measuring the shaped disk 17.
  • the carriage 19 can be retracted by hand from a position radially distant from the spectacle lens holding shaft 7, 8, 14 and remains in this position since a resilient latching element 29 is arranged on the carriage 19 and a detent lug 25 on the carrier 24.
  • Spectacle lens holding shaft 7, 8 with respect to the shaft 3 with the grinding wheels 4, 5, 6 determined radially and axially and the carriage 19 first m retracted the engaged position.
  • the shaped disk 17 to be measured is placed on the pins 15, 16, the slide 19 is disengaged and the feeler shoe 18 is brought into contact with the shaped disk 17.
  • the feeler shoe 18 follows the contour of the shaping disk 17, which is recorded in the form of radius values (r) by the encoder 27 and in the form of angle values by the encoder 13 and in the Computer 10 can be saved.
  • the amount of data recorded can then be used to shape a raw glass inserted between the half-waves 7, 8 according to the shaped disk 17 and to provide it with a facet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

The invention relates to a device for measuring a former in a CNC eyeglass frame grinding machine, comprising a computer to control said machine, at least one grinding disc in a grinding chamber, an eyeglass retaining shaft that can be rotated in a codeable angular position and which can be radially and axially adjusted in relation to the grinding disc and locked, an angle sensor to detect the swing angle (ςn) of the eyeglass retaining shaft, a perpendicular holding device for a former, said device being located on the end coming out of the grinding chamber, and a touch sensor located on the former which can be displaced radially in relation to the eyeglass retaining shaft and which has a displacement sensor to detect the radius values (rn) of the former.

Description

"Vorrichtung zum Vermessen einer Formscheibe""Device for measuring a shaped disk"
Die Erfindung betrifft eine Vorrichtung zum Vermessen einer Formscheibe in einer CNC-gesteuertenThe invention relates to a device for measuring a shaped disk in a CNC-controlled
Brillenglasrandschleifmaschine mit einem Rechner zum Steuern der Brillenglasrandschleifmaschine, wenigstens einer Schleifscheibe in einer Schleifkammer sowie einer winkelkodierbar drehbaren, relativ zu der Schleifscheibe radial und axial verstellbaren Brillenglashaltewelle.Spectacle lens edge grinding machine with a computer for controlling the spectacle lens edge grinding machine, at least one grinding wheel in a grinding chamber and an angle-coded rotatable, relative to the grinding wheel radially and axially adjustable spectacle lens holding shaft.
Eine derartige Vorrichtung in Verbindung mit einer CNC-gesteuerten Brillenglasrandschleifmaschine ist beispielsweise in der deutschen Offenlegungsschrift 34 10 040 beschrieben. Diese bekannte Brillenglasrandschleifmaschine weist eine drehbare, auf einer Grundplatte feststehend angeordnete Schleifscheibe in einer Schleifkammer auf, während eine radial und axial verstellbare Brillenglashaltewelle in einem Rahmen oberhalb der Schleifscheibe angeordnet ist. An einem aus der Schleifkammer herausgeführten Ende der Brillenglashaltewelle ist eine kreisrunde Scheibe angeordnet, die auf einem mittels eines Servomotors höhenverstellbaren Schuh ruht. Dieser Schuh läßt sich mittels des Servomotors so verstellen, daß sich der Abstand der Brillenglashaltewelle während des Schleifvorgangs von der Schleifscheibe entsprechend dem Umfang des formzuschleifenden Brillenglases verändert. Die Formdaten des zu schleifenden Brillenglases sind in einem Rechner zum Steuern der Brillenglasrandschleifmaschine gespeichert. Um die Formdaten einer einer Brillenglasöffnung eines ausgewählten Brillengestells entsprechenden Formscheibe aufzunehmen, wird die Formscheibe anstelle eines Brillenglases in die Brillenglashaltewelle eingespannt und auf die stillstehende Schleifscheibe aufgesetzt. Wird nun die Brillenglashaltewelle in Drehung versetzt, verändert sich der Abstand der Brillenglashaltewelle von der Schleifscheibe entsprechend der Form der Formscheibe . Der an der Kreisscheibe am Ende der Brillenglashaltewelle anliegende Tastschuh folgt dieser Bewegung und liefert Radiuswerte (rn) an den Rechner, die in Verbindung mit den entsprechendenSuch a device in connection with a CNC-controlled spectacle lens edge grinding machine is described, for example, in German Offenlegungsschrift 34 10 040. This known spectacle lens edge grinding machine has a rotatable grinding wheel fixedly arranged on a base plate in a grinding chamber, while a radially and axially adjustable spectacle lens holding shaft is arranged in a frame above the grinding wheel. At one end of the spectacle lens holding shaft which is led out of the grinding chamber, a circular disk is arranged which rests on a shoe which is height-adjustable by means of a servo motor. This shoe can be adjusted by means of the servo motor in such a way that the distance of the spectacle lens holding shaft from the grinding wheel changes during the grinding process in accordance with the circumference of the spectacle lens to be shaped. The shape data of the spectacle lens to be ground are stored in a computer for controlling the spectacle lens edge grinding machine. In order to record the shape data of a shaped disk corresponding to an eyeglass lens opening of a selected eyeglass frame, the shaped disk is clamped in the eyeglass lens holding shaft instead of an eyeglass lens and placed on the stationary grinding disk. If the lens holder shaft is rotated, the changes Distance of the lens holder shaft from the grinding wheel in accordance with the shape of the shaped wheel. The feeler shoe attached to the circular disc at the end of the lens holding shaft follows this movement and delivers radius values (r n ) to the computer which, in conjunction with the corresponding ones
Winkel (pn) der Brillenglashaltewelle, die von einem Winkelgeber aufgenommen werden, die Datenmenge der Formdaten der Formscheibe bilden, die zum anschließenden Formschleifen eines Brillenglases verwendet werden können.Angle (p n ) of the spectacle lens holding shaft, which are picked up by an angle encoder, form the data quantity of the shape data of the shaping disk, which can be used for the subsequent shaping of an eyeglass lens.
Bei dieser bekannten Brillenglasrandschleifmaschine muß eine Formscheibe anstelle eines Brillenglases in die Brillenglashaltewelle eingespannt werden. Da die üblichen Formscheiben mittels einer Aufnahme an derIn this known spectacle lens edge grinding machine, a shaped disk must be clamped in the spectacle lens holding shaft instead of an spectacle lens. Since the usual shaped discs by means of a holder on the
Brillenglashaltewelle gehalten werden, die unterschiedlich zu dem Block oder Sauger ist, mit dem ein Brillenglas in eine Brillenglashaltewelle eingesetzt wird, ist es erforderlich, für das Einsetzen der Formscheibe in dieEyeglass lens holding shaft, which is different from the block or suction cup with which an eyeglass lens is inserted into an eyeglass lens holding shaft, it is necessary for the insertion of the shaped disc in the
Brillenglashaltewelle eine besondere Halterung vorzusehen, die einerseits zur Formscheibe paßt und andererseits der Aufnahme für einen üblichen Block oder Sauger an der Brillenglashaltewelle entspricht. Hierdurch wird die Handhabung der Vorrichtung zum Vermessen einer Formscheibe kompliziert und erfordert daher eine gewisse Geschicklichkeit von der Bedienungsperson. Des weiteren liegt die Formscheibe beim Vermessen auf der stillstehenden Schleifscheibe auf, so daß sie beim Drehen abgeschliffen wird, worunter die Genauigkeit der Messung leidet. Diese Abnutzung kann, da die Formscheiben in der Regel aus Kunststoff bestehen, auch zu einem bereichsweisen Verschmieren der Schleifscheibe führen, wodurch der anschließende Schleifvorgang eines Brillenglases beeinträchtigt wird.Spectacle lens holding shaft to provide a special holder that fits on the one hand to the shaped disc and on the other hand corresponds to the receptacle for a conventional block or suction cup on the spectacle lens holding shaft. This complicates the handling of the device for measuring a shaped disk and therefore requires a certain skill on the part of the operator. Furthermore, the shaped wheel lies on the stationary grinding wheel during measurement, so that it is ground off when turning, which affects the accuracy of the measurement. This wear and tear, since the shaped disks are generally made of plastic, can also result in area-wise smearing of the grinding disk, as a result of which the subsequent grinding process of a spectacle lens is impaired.
In der deutschen Offenlegungsschrift 196 16 572 derselben Anmelderin ist des weiteren eine Vorrichtung zum Vermessen eines Brillengestells oder eines Brillenglases oder einer Formscheibe beschrieben, die ebenfalls in eine CNC-gesteuerte Brillenglasrandschleifmaschine integriert ist und bei der innerhalb der Schleifkammer ein feststehender Tastschuh angeordnet ist. Zum Vermessen einer Formscheibe wird diese in die Brillenglashaltewelle in der Schleifkammer eingespannt, auf den Tastschuh gesetzt und in Drehung versetzt. Dabei nehmen in der Maschine ohnehin vorhandene Encoder zum Steuern des Schleifens eines Brillenglases die Radius- und Winkelwerte der Formscheibe auf und diese Datenmenge wird im Rechner der Brillenglasrandschleifmaschine gespeichert und zum Schleifen eines Brillenglases verwendet. Diese Vorrichtung hat sich im Betrieb bewährt, da sie sich nicht nur zum Vermessen einer Formscheibe, sondern auch zum Vermessen eines Brillengestells oder eines Brillenglases verwenden läßt, erfordert jedoch eine besondere Halterung für die Formscheibe, wenn diese in die Brillenglashaltewelle eingesetzt wird. Des weiteren ist bei dieser Vorrichtung eine Anpassung des Programms zum CNC-Steuern des Schleifvorgangs erforderlich, um die dafür vorhandenen Encoder auch zum Aufnehmen der Radius- und Winkelwerte verwenden zu können.In the German patent application 196 16 572 by the same applicant, a device for measuring a spectacle frame or a spectacle lens or a shaped disk is also described, which is also integrated in a CNC-controlled spectacle lens edge grinding machine and in which a fixed probe shoe is located within the grinding chamber is arranged. To measure a shaped disc, it is clamped into the spectacle lens holding shaft in the grinding chamber, placed on the probe shoe and set in rotation. In this case, encoders already present in the machine for controlling the grinding of a spectacle lens record the radius and angle values of the shaped disk and this amount of data is stored in the computer of the spectacle lens edge grinding machine and used for grinding a spectacle lens. This device has proven itself in operation, since it can be used not only for measuring a shaped disc, but also for measuring a spectacle frame or a spectacle lens, but requires a special holder for the shaped disc when it is inserted into the spectacle lens holding shaft. Furthermore, with this device, an adaptation of the program for CNC control of the grinding process is necessary in order to be able to use the encoders available for this purpose to record the radius and angle values.
Der Erfindung liegt das Problem zugrunde eine CNC-gesteuerte Brillenglasrandschleifmaschine mit einer einfachen Vorrichtung zum Vermessen einer Formscheibe zu versehen, die sich ohne besondere Änderungen an derThe invention is based on the problem of providing a CNC-controlled spectacle lens edge grinding machine with a simple device for measuring a shaped disc, which can be modified without any special changes
Brillenglasrandschleifmaschine und an deren Steuerprogramm verwenden läßt.Eyeglass lens edge grinding machine and can be used in their control program.
Ausgehend von dieser Problemstellung wird eine Vorrichtung zum Vermessen einer Formscheibe in einer CNC-gesteuerten Brillenglasrandschleifmaschine mit einem Rechner zum Steuern der Brillenglasrandschleifmaschine, wenigstens einer Schleifscheibe in einer Schleifkammer und einer winkelkodierbar drehbaren, relativ zu der Schleifscheibe radial und axial verstellbaren Brillenglashaltewelle vorgeschlagen, bei der erfindungsgemäß zum Vermessen einer Formscheibe die Brillenglashaltewelle radial und axial feststellbar ist, ein Winkelgeber zum Aufnehmen derBased on this problem, a device for measuring a shaped wheel in a CNC-controlled spectacle lens edge grinding machine with a computer for controlling the spectacle lens edge grinding machine, at least one grinding wheel in a grinding chamber and an angle-coded rotatable and radially and axially adjustable spectacle lens holding shaft relative to the grinding wheel is proposed in the case of the invention for measuring a shaped disc, the spectacle lens holding shaft can be locked radially and axially, an angle encoder for receiving the
Drehwinkel (pn) der Brillenglashaltewelle, eine an einem aus der Schleifkammer herausgeführten Ende derAngle of rotation (p n ) of the spectacle lens holding shaft, one at an end of the grinding chamber which is led out of the grinding chamber
Brillenglashaltewelle angeordnete, winkelgerechte Halterung für eine Formscheibe und ein an der Formscheibe anliegender, bezüglich der Brillenglashaltewelle radial verschiebbarer Tastschuh mit einem Weggeber zum Aufnehmen der Radiuswerte (rn) der Formscheibe vorgesehen sind.Spectacle lens holding shaft arranged, angled holder for a shaped disc and a fitting to the shaped disc radially displaceable probe shoe with a displacement sensor for recording the radius values (r n ) of the shaped disk are provided with respect to the spectacle lens holding shaft.
Bei der erfindungsgemaßen Vorrichtung weist das aus der Schleifkammer herausgeführte Ende der Brillenglashaltewelle eine übliche Aufnahme zum winkelgerechten Befestigen einer Formscheibe auf. Mit der an dieser Aufnahme angeordneten Formscheibe steht ein bezuglich der Brillenglashaltewelle radial verschiebbaren Tastschuh in Berührung, dessen Weggeber die Radiuswerte (rn) der Formscheibe aufnimmt, wahrend gleichzeitig mittels eines Winkelgebers die dazugehörigenIn the device according to the invention, the end of the spectacle lens holding shaft which is led out of the grinding chamber has a customary receptacle for the angular fastening of a shaped disk. A contact shoe, which is radially displaceable with respect to the spectacle lens holding shaft, is in contact with the shaped disk arranged on this receptacle, the displacement sensor of which records the radius values (r n ) of the shaped disk, while at the same time the associated sensors are used by means of an angle transmitter
Drehwinkel (pn) der Brillenglashaltewelle aufgenommen werden. Mit dieser einfachen Vorrichtung ist es somit möglich, eine Formscheibe zu vermessen, ohne daß Eingriffe in die Brillenglasrandschleifmaschine und m deren Steuerprogramm erforderlich sind. Die Handhabung dieser Vorrichtung ist einfach und ohne Gefahr von Bedienungsfehlern möglich und das Vermessen einer Formscheibe laßt sich sehr schnell durchfuhren, da die Brillenglashaltewelle beim Messen mit einer gegenüber dem Schleifvorgang erhöhten Geschwindigkeit umlaufen kann.Angle of rotation (p n ) of the lens holder shaft are recorded. With this simple device, it is thus possible to measure a shaped disk without interfering with the spectacle lens edge grinding machine and its control program. This device can be handled easily and without the risk of operating errors, and the measurement of a shaped disk can be carried out very quickly, since the spectacle lens holding shaft can rotate during measurement at a higher speed than the grinding process.
Vorzugsweise kann der Tastschuh an einem Schlitten angeordnet und der Schlitten auf einer an derThe feeler shoe can preferably be arranged on a carriage and the carriage on one
Brillenglasrandschleifmaschine befestigten Fuhrung gleiten, wobei bevorzugterweise zur Reibungsverminderung eine Kugelfuhrung für den Schlitten vorgesehen sein kann. Diese Kugelfuhrung lauft auf einer Kugelfuhrungsstange, wobei der Schlitten gegen Kippen durch eine zur Kugelfuhrungsstange parallelen Leitschiene am Schlitten und wenigstens eine sich auf der Leitschiene abstutzenden Gleitrolle am Trager für die Kugelfuhrungsstange gesichert sein kann.Glasses edge grinding machine attached guide slide, preferably a ball guide for the carriage can be provided to reduce friction. This ball guide runs on a ball guide rod, and the slide can be secured against tipping by a guide rail on the slide parallel to the ball guide rod and at least one slide roller supported on the guide rail on the carrier for the ball guide rod.
Wenn zwei parallele Kugelfuhrungen und Kugelfuhrungsstangen am Schlitten und am Trager vorgesehen werden, ist auf diese Weise ebenfalls eine Kippsicherung gegeben, so daß die vorerwähnte Leitschiene mit der Leitrolle dann nicht erforderlich sind. Der Weggeber kann vorteilhafterweise aus einer Zahnstange am Schlitten und einem mit der Zahnstange m Eingriff stehenden Encoder am Trager bestehen.If two parallel ball guides and ball guide rods are provided on the slide and on the carrier, a tilt protection is also provided in this way, so that the aforementioned guide rail with the guide roller is then not required. The displacement sensor can advantageously consist of a toothed rack on the slide and an encoder on the carrier which engages with the toothed rack.
Wird der Tastschuh mittels Federkraft m Richtung der Brillenglashaltewelle beaufschlagt, laßt er sich von Hand m eine von der Brillenglashaltewelle radial entfernte Stellung bewegen und sich bevorzugterweise m dieser Stellung mittels einer Rastung festlegen, so daß m dieser Stellung ein bequemes Ansetzen und Abnehmen einer Formscheibe möglich ist.If the feeler shoe is acted upon by means of spring force m in the direction of the spectacle lens holding shaft, it can be moved by hand m to a position radially distant from the spectacle lens holding shaft and preferably fixed in this position by means of a detent, so that a convenient placement and removal of a shaped plate is possible in this position .
Die Erfindung wird nachstehend anhand eines m der Zeichnung dargestellten Ausfuhrungsbeispiels des näheren erläutert. In der Zeichnung zeigen:The invention is explained below with reference to an exemplary embodiment shown in the drawing. The drawing shows:
Fig. 1 eine schematische Vorderansicht einerFig. 1 is a schematic front view of a
Brillenglasrandschleifmaschine mit der daran angeordneten erfmdungsgemaßen Vorrichtung zum Vermessen einer Formscheibe,Spectacle lens edge grinding machine with the device according to the invention arranged thereon for measuring a shaped disk,
Fig. 2 eine Detailansicht, teilweise im Schnitt, der erfmdungsgemaßen Vorrichtung in Draufsicht undFig. 2 is a detailed view, partly in section, of the device according to the invention in plan view and
Fig. 3 eine Seitenansicht der erfmdungsgemaßenFig. 3 is a side view of the invention
Vorrichtung.Contraption.
Die Fig. 1 dargestellte Brillenglasrandschleifmaschine weist ein Gehäuse 1 mit einer Schleifkammer 2 auf, m der eine auf einer Welle 3 angeordnete VorschleifScheibe 4 mit zylindrischen Umfang und zwei FacettenschleifScheiben 5, 6 mit unterschiedlichen Facettennuten angeordnet sind. Parallelachsig zur Welle 3 mit den Schleifscheiben 4, 5, 6 ist eine Brillenglashaltewelle aus zwei Hälften 7, 8 angeordnet, von denen sich die Halbwelle 7 mittels einer Handhabe 9 axial verschieben laßt, um ein nicht dargestelltes Rohglas einzuklemmen. Die Schleifkammer 2 ist wahrend des Schleifvorgangs mittels eines nicht dargestellten Klappdeckels verschlossen.The spectacle lens edge grinding machine shown in FIG. 1 has a housing 1 with a grinding chamber 2, in which a pre-grinding wheel 4 with a cylindrical circumference and two facet grinding wheels 5, 6 with different facet grooves are arranged on a shaft 3. Arranged parallel to the shaft 3 with the grinding wheels 4, 5, 6 is a spectacle lens holding shaft composed of two halves 7, 8, of which the half shaft 7 can be axially displaced by means of a handle 9 in order to clamp a raw glass (not shown). The grinding chamber 2 is during the grinding process by means of a not shown Hinged lid closed.
Zum Schleifen wird die Welle 3 mit den Schleifscheiben 4, 5, 6 in eine schnelle Drehung versetzt, während sich das von der Brillenglashaltewelle 7, 8 gehaltene Rohglas langsam dreht. Der Abstand der Brillenglashaltewelle 7, 8 von der Welle 3 mit den Schleifscheiben 4, 5, 6 wird durch einen Rechner 10 gesteuert, in dem Steuerdaten zum Schleifen des Rohglases entsprechend der Form eines ausgewählten Brillengestells gespeichert sind. Am Gehäuse 1 sind noch eine Eingabetastatur 11 und ein Bildschirm 12 angeordnet. Mittels der Eingabetastatur 11 lassen sich in bekannter Weise gespeicherte Brillenglaskonturen aufrufen und zur Brillenglasbearbeitung an die Steuerung der Brillenglasrandschleifmaschine leiten.For grinding, the shaft 3 is set in rapid rotation with the grinding wheels 4, 5, 6, while the raw glass held by the spectacle lens holding shaft 7, 8 rotates slowly. The distance between the spectacle lens holding shaft 7, 8 and the shaft 3 with the grinding wheels 4, 5, 6 is controlled by a computer 10, in which control data for grinding the raw lens corresponding to the shape of a selected spectacle frame are stored. An input keyboard 11 and a screen 12 are also arranged on the housing 1. Using the input keyboard 11, stored spectacle lens contours can be called up in a known manner and sent to the control of the spectacle lens edge grinding machine for processing the spectacle lens.
Des weiteren ist es möglich, mittels der Eingabetastatur 11 personliche Daten des Brillenträgers einzugeben, zum Beispiel der Pupillenabstand, die Achsenlage eines zylindrischen oder prismatischen Schliffs des Brillenglases oder die Lage eines Nahteils .Furthermore, it is possible to enter personal data of the spectacle wearer using the input keyboard 11, for example the pupil distance, the axial position of a cylindrical or prismatic cut of the spectacle lens or the position of a close-up part.
Ein Bildschirm 12 dient dazu, die eingegebenen Daten anzuzeigen. Des weiteren lassen sich auf dem Bildschirm 12 das kreisförmige Rohglas und/oder ein entsprechend den eingegebenen Daten formgeschliffenes Brillenglas darstellen.A screen 12 serves to display the entered data. Furthermore, the circular raw glass and / or a spectacle lens ground according to the entered data can be displayed on the screen 12.
Seitlich am Gehäuse 1 ist ein Ende 14 der Halbwelle 8 herausgeführt. An diesem Ende 14 ist eine Aufnahme in Form von Stiften 15, 16 mit unterschiedlichen Durchmessern für eine Formscheibe 17 angeordnet. Die Formscheibe 17 weist entsprechende Locher mit entsprechendem Durchmesser auf, so daß sie sich nur in einer bestimmten Winkelstellung an das herausgeführte Ende 14 der Halbwelle 8 ansetzen laßt.One end 14 of the half shaft 8 is led out laterally on the housing 1. At this end 14 there is a receptacle in the form of pins 15, 16 with different diameters for a shaped disk 17. The shaped disk 17 has corresponding holes with a corresponding diameter, so that they can only be attached to the led out end 14 of the half shaft 8 in a certain angular position.
Wie in Fig. 1 dargestellt, liegt ein Tastschuh 18 am äußeren Umfang der Formscheibe 17 an. Dieser Tastschuh 18 ist an einem Schlitten 19 befestigt, der bezuglich der Brillenglashaltewelle 7, 8 radial beweglich ist. Wie sich aus den Fig. 2 und 3 ergibt, ist der Schlitten 19 mit einer Kugelfuhrung 20 versehen, durch die eine Kugelfuhrungsstange 21 gefuhrt ist. Diese Kugelfuhrungsstange 21 ist an einem Trager 24 befestigt, der selber wiederum am Gehäuse 1 der Brillenglasrandschleifmaschine angeschraubt ist. Konzentrisch zur Kugelfuhrungsstange 21 ist eine Druckfeder 22 angeordnet, die sich einerseits am Trager 24 und andererseits am Schlitten 19 abstutzt und den TastschuhAs shown in FIG. 1, a feeler shoe 18 lies against the outer circumference of the shaped disk 17. This tactile shoe 18 is fastened to a slide 19 which is radially movable with respect to the spectacle lens holding shaft 7, 8. 2 and 3, the carriage 19 is provided with a ball guide 20 through which a ball guide rod 21 is guided. This ball guide rod 21 is fastened to a carrier 24, which in turn is screwed onto the housing 1 of the spectacle lens edge grinding machine. A compression spring 22 is arranged concentrically to the ball guide rod 21, which is supported on the one hand on the carrier 24 and on the other hand on the slide 19 and the feeler shoe
18 m Richtung der Formscheibe 17 drangt und m Anlage mit der Formscheibe 17 halt.18 m in the direction of the shaped disk 17 and stops in the system with the shaped disk 17.
Um den Schlitten 19 gegen Kippen gegenüber dem Trager 24 zu sichern, dabei aber die Reibung der Bewegung des SchlittensIn order to secure the carriage 19 against tilting relative to the carrier 24, the friction of the movement of the carriage
19 klein zu halten, ist am Schlitten 19 parallelachsig zur Kugelfuhrungsstange 21 eine Leitschiene 23 angeordnet, auf der sich eine Leitrolle 25, die am Trager 24 befestigt ist, abstutzt. Am Schlitten 19 ist des weiteren eine Zahnstange 26 befestigt, die mit einem Zahnrad an einem tragerfesten Encoder 27 Eingriff steht, so daß der Encoder 27 als Weggeber f r die Radialbewegung des Tastschuhs 18 beim Vermessen der Formscheibe 17 dient. Der Schlitten 19 laßt sich eine von der Brillenglashaltewelle 7, 8, 14 radial entfernten Stellung von Hand zurückziehen und verbleibt dieser Stellung, da am Schlitten 19 eme Rastnase 25 und am Trager 24 ein federndes Rastelement 29 angeordnet sind.19 keep small, a guide rail 23 is arranged on the slide 19 parallel to the ball guide rod 21, on which a guide roller 25, which is fastened to the carrier 24, is supported. Furthermore, a rack 26 is attached to the slide 19, which meshes with a gear on a carrier-fixed encoder 27, so that the encoder 27 serves as a displacement sensor for the radial movement of the feeler shoe 18 when measuring the shaped disk 17. The carriage 19 can be retracted by hand from a position radially distant from the spectacle lens holding shaft 7, 8, 14 and remains in this position since a resilient latching element 29 is arranged on the carriage 19 and a detent lug 25 on the carrier 24.
Zum Vermessen einer Formscheibe 17 wird dieTo measure a shaped disc 17 is the
Brillenglashaltewelle 7, 8 mit Bezug auf die Welle 3 mit den Schleifscheiben 4, 5, 6 radial und axial festgestellt und der Schlitten 19 zunächst m die eingerastete Stellung zurückgezogen. Nunmehr wird die zu vermessende Formscheibe 17 auf die Stifte 15, 16 aufgesetzt, der Schlitten 19 ausgerastet und der Tastschuh 18 m Anlage an die Formscheibe 17 gebracht. Wird die Brillenglashaltewelle 7, 8, 14 mit der daran befestigten Formscheibe 17 Drehung versetzt, folgt der Tastschuh 18 der Kontur der Formscheibe 17, die m Form von Radiuswerten (r ) durch den Encoder 27 und m Form von Winkelwerten durch den Wmkelgeber 13 aufgenommen und im Rechner 10 gespeichert werden. Die aufgenommene Datenmenge läßt sich anschließend dazu verwenden, ein zwischen die Halbwellen 7, 8 eingesetztes Rohglas entsprechend der Formscheibe 17 formzuschleifen und mit einer Facette zu versehen. Spectacle lens holding shaft 7, 8 with respect to the shaft 3 with the grinding wheels 4, 5, 6 determined radially and axially and the carriage 19 first m retracted the engaged position. Now the shaped disk 17 to be measured is placed on the pins 15, 16, the slide 19 is disengaged and the feeler shoe 18 is brought into contact with the shaped disk 17. If the spectacle lens holding shaft 7, 8, 14 is rotated with the shaping disk 17 attached to it, the feeler shoe 18 follows the contour of the shaping disk 17, which is recorded in the form of radius values (r) by the encoder 27 and in the form of angle values by the encoder 13 and in the Computer 10 can be saved. The amount of data recorded can then be used to shape a raw glass inserted between the half-waves 7, 8 according to the shaped disk 17 and to provide it with a facet.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Vorrichtung zum Vermessen einer Formscheibe in einer CNC-gesteuerten Brillenglasrandschleifmaschine mit1. Device for measuring a shaped disc in a CNC-controlled spectacle lens edge grinding machine with
- einem Rechner (10) zum Steuern der Brillenglasrandschleifmaschine,- a computer (10) for controlling the lens edge grinding machine,
- wenigstens einer Schleifscheibe (4, 5, 6) in einer Schleifkammer (2),- at least one grinding wheel (4, 5, 6) in a grinding chamber (2),
- einer winkelkodierbar drehbaren, relativ zu der Schleifscheibe (4, 5, 6) radial und axial verstellbaren und feststellbaren Brillenglashaltewelle (7, 8),- an eyeglass-rotatable, relative to the grinding wheel (4, 5, 6) radially and axially adjustable and lockable spectacle lens holding shaft (7, 8),
- einem Winkelgeber (13) zum Aufnehmen der Drehwinkel (pn) der Brillenglashaltewelle (7, 8),- an angle encoder (13) for recording the angle of rotation (p n ) of the spectacle lens holding shaft (7, 8),
- einer an einem aus der Schleif ammer (2) herausgeführten Ende (14) der Brillenglashaltewelle (7, 8) angeordneten, winkelgerechten Halterung (15, 16) für eine Formscheibe- One at one of the grinding burr (2) led out end (14) of the spectacle lens holding shaft (7, 8) arranged, angled bracket (15, 16) for a shaped disc
(17) und(17) and
- einem an der Formscheibe (17) anliegenden, bezüglich der Brillenglashaltewelle radial verschiebbaren Tastschuh- One on the shaped disc (17), radially displaceable with respect to the lens holding shaft probe shoe
(18) mit einem Weggeber (27) zum Aufnehmen der Radiuswerte (rn) der Formscheibe (17) .(18) with a displacement sensor (27) for recording the radius values (r n ) of the shaped disk (17).
2. Vorrichtung nach Anspruch 1, bei der der Tastschuh (18) an einem Schlitten (19) angeordnet ist und der Schlitten (19) auf einer an der Brillenglasrandschleifmaschine befestigten Führung (20, 21) gleitet.2. Device according to claim 1, in which the feeler shoe (18) is arranged on a slide (19) and the slide (19) slides on a guide (20, 21) attached to the lens edge grinding machine.
3. Vorrichtung nach Anspruch 2, mit einer Kugelführung (20) für den Schlitten (19) .3. Device according to claim 2, with a ball guide (20) for the carriage (19).
4. Vorrichtung nach Anspruch 3, mit einer zur Kugelführung4. The device according to claim 3, with a ball guide
(20) parallelen Leitschiene (23) am Schlitten (19) und wenigstens einer sich auf der Leitschiene abstützenden Leitrolle (25) an einen Träger (24) für eine Kugelfuhrungsstange (21).(20) parallel guide rail (23) on the slide (19) and at least one supported on the guide rail Guide roller (25) on a carrier (24) for a ball guide rod (21).
5. Vorrichtung nach einem der Ansprüche 1 bis 4, mit einem mit einer Zahnstange (26) im Eingriff stehenden Encoder5. Device according to one of claims 1 to 4, with a with a rack (26) in engagement encoder
(27) als Weggeber.(27) as a signpost.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, mit einem mit Federkraft in Richtung der Brillenglashaltewelle (7, 8) beaufschlagten Tastschuh (18) und einer Rastung (28, 29) zwischen dem Schlitten (19) und dem Träger (24) in der radial entferntesten Stellung des Tastschuhs (18). 6. Device according to one of claims 1 to 5, with a spring force in the direction of the spectacle lens holding shaft (7, 8) acted on the probe shoe (18) and a detent (28, 29) between the carriage (19) and the carrier (24) in the radially most distant position of the feeler shoe (18).
PCT/EP1998/006786 1997-10-31 1998-10-26 Device for measuring a former WO1999022906A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19748160.4 1997-10-31
DE1997148160 DE19748160A1 (en) 1997-10-31 1997-10-31 Device for measuring a shaped disk

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CN109396555A (en) * 2018-09-18 2019-03-01 温州职业技术学院 A kind of full-automatic magnet ring chamfering grinding apparatus persistently conveying magnet ring
CN109396556A (en) * 2018-09-18 2019-03-01 温州职业技术学院 A kind of full-automatic magnet ring chamfering grinding apparatus

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CN106625103A (en) * 2017-03-03 2017-05-10 刘琳 Profiling stone edge grinding mechanism

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EP0190450A1 (en) * 1984-12-25 1986-08-13 Kabushiki Kaisha TOPCON Device for measuring the profile of spectacles lens frame
EP0432078A2 (en) * 1989-10-27 1991-06-12 Indo Internacional S.A. Lens bevelling machine
DE4107509A1 (en) * 1990-03-09 1991-10-02 Nikon Corp Lens shape measurement device for automatic spectacle lens manufacture - contains contact measurement element with position sensor and arithmetic unit
US5465495A (en) * 1993-06-28 1995-11-14 Kabushiki Kaisha Takubo Seiki Seisakusho Lens shape measuring instrument

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DE3774730D1 (en) * 1986-01-30 1992-01-09 Topcon Corp METHOD AND DEVICE FOR GRINDING LENSES.
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EP0190450A1 (en) * 1984-12-25 1986-08-13 Kabushiki Kaisha TOPCON Device for measuring the profile of spectacles lens frame
EP0432078A2 (en) * 1989-10-27 1991-06-12 Indo Internacional S.A. Lens bevelling machine
DE4107509A1 (en) * 1990-03-09 1991-10-02 Nikon Corp Lens shape measurement device for automatic spectacle lens manufacture - contains contact measurement element with position sensor and arithmetic unit
US5465495A (en) * 1993-06-28 1995-11-14 Kabushiki Kaisha Takubo Seiki Seisakusho Lens shape measuring instrument

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109396555A (en) * 2018-09-18 2019-03-01 温州职业技术学院 A kind of full-automatic magnet ring chamfering grinding apparatus persistently conveying magnet ring
CN109396556A (en) * 2018-09-18 2019-03-01 温州职业技术学院 A kind of full-automatic magnet ring chamfering grinding apparatus

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