EP0374587B1 - Spectacle glasses bevel grinding machine - Google Patents

Spectacle glasses bevel grinding machine Download PDF

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Publication number
EP0374587B1
EP0374587B1 EP89122496A EP89122496A EP0374587B1 EP 0374587 B1 EP0374587 B1 EP 0374587B1 EP 89122496 A EP89122496 A EP 89122496A EP 89122496 A EP89122496 A EP 89122496A EP 0374587 B1 EP0374587 B1 EP 0374587B1
Authority
EP
European Patent Office
Prior art keywords
spectacle lens
grinding wheel
sensing head
grinding
web
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
EP89122496A
Other languages
German (de)
French (fr)
Other versions
EP0374587A2 (en
EP0374587A3 (en
Inventor
Lutz Dr.-Ing. Gottschald
Klaus Eickmeyer
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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Publication date
Application filed by Wernicke and Co GmbH filed Critical Wernicke and Co GmbH
Publication of EP0374587A2 publication Critical patent/EP0374587A2/en
Publication of EP0374587A3 publication Critical patent/EP0374587A3/en
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Publication of EP0374587B1 publication Critical patent/EP0374587B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B24B47/225—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30084—Milling with regulation of operation by templet, card, or other replaceable information supply
    • Y10T409/301176—Reproducing means
    • Y10T409/301624—Duplicating means
    • Y10T409/30168—Duplicating means with means for operation without manual intervention
    • Y10T409/301904—Duplicating means with means for operation without manual intervention including tracer adapted to trigger electrical energy
    • Y10T409/30196—Duplicating means with means for operation without manual intervention including tracer adapted to trigger electrical energy to actuate electrically driven work or tool moving means

Definitions

  • the invention relates to a spectacle lens edge grinding machine of the type mentioned in the preamble of claims 1 and 2.
  • an eyeglass lens grinding machine of this type is known, which is used to grind a facet on the lens edge.
  • the inside and outside of the lens near the lens circumference is scanned by two spring-loaded pin-shaped sensors, which are constantly in direct contact with the lens and whose axial position is communicated to potentiometers, the values and data determined by these potentiometers being sent to a computer or be passed on to a data store.
  • Such a scanning device if the scanning takes place simultaneously with the grinding, causes grinding marks in the vicinity of the glass circumference caused by ground glass particles.
  • one of the sensors needs to be pulled back against spring force to create a distance between the two sensors in which the glass rim can be inserted.
  • the object of the invention is to provide an eyeglass lens grinding machine of the type mentioned, in which the data of the curve of the grinding point on the grinding wheel circumference described by the front and rear eyeglass lens edge is made possible without grinding grooves as in the above described, known machine arise.
  • the invention provides according to the characterizing features of claim 1 that the probe is formed with legs parallel to each other and to the grinding wheel plane, which are connected to one another on one or both sides of their ends with a web and are arranged at a distance from one another , which is larger than the largest width of the lens circumference, and the probe carries the contact of the legs through the front and the back of the spectacle lens, the signals of which are carried out by the computer to carry out the oscillating reciprocation of the half-waves with the spectacle lens or the grinding wheel with the probe with a constant amplitude of a minimum size corresponding to the distance between the legs and for determination the curve of the grinding point on the circumference of the grinding wheel described by the outer and inner lens rim.
  • the invention according to the characterizing features of claim 2 provides that the probe is formed with legs parallel to each other and to the grinding wheel plane, which are connected to one another on one or both sides of their ends with a web and are arranged at a distance from one another , which is larger than the largest width of the lens circumference and the probe carries the contact of the thighs through the front and the rear of the spectacle lens, the signals of which are carried out by the computer to carry out the oscillating back and forth movement of the half-waves with the spectacle lens or the Grinding wheel with the probe with an amplitude size, which is determined by the respective contact of the lens on the legs, wherein the time period of the back and forth movements of the lens or the grinding wheel between the predetermined lens plane and the reversal points of the back and forth movement is measured and for Bes the curve of the grinding point on the circumference of the grinding wheel described by the outer and inner rim of the lens is used.
  • DE-U 85 29 208 discloses in this respect an eyeglass lens edge grinding machine in which the grinding wheel is evenly worn across its width in that the eyeglass lens reciprocates across the width of the grinding wheel, the sides of which are narrow beveled contact surfaces for the front or rear Has peripheral edge of the lens.
  • a reversing gear is used, which is load-dependent and reverses the transverse movement of the spectacle lens, so that this reversal of movement always takes place at the same axial height of the grinding wheel width.
  • the reversing of the back and forth movement of the grinding wheel or the spectacle lens and arranged at a distance from the approximate grinding wheel width are arranged movably, their movement being both the desired data pulses and the reversing signals for the completion of a walk and the beginning of a course of the oscillating movement of the grinding wheel or the spectacle lens.
  • the grinding wheel S of the spectacle lens edge grinding machine is arranged in a rotationally fixed manner on the longitudinally displaceable shaft 1 and is set in rotation by this.
  • two parallel struts 3, 4 are provided on both sides of the grinding wheel on a wall of the machine housing, not shown, which merge into approximately vertical further struts 5, 6.
  • a fork-shaped probe head which bears the general reference number 7 and which consists of a web 8 and two parallel fork legs 9, 10, which in their starting position are at a distance a from the approximate width b of the grinding wheel to have.
  • the spectacle lens B is held in a known manner between two half-shafts 14, 15 of the machine and caused to rotate by this; on the half shaft 14, the template 16 is rotatably attached, which is supported on a support part 17.
  • the web 8 of the probe 7 has two short shoulders 18, 19 which end in an oblique edge 20, 21 (FIG. 2). These are each opposite a likewise oblique edge 22, 23 of the fork legs 9, 10, the two oblique edges 20, 22 and 21, 23 forming a vertical gap 24 with a triangular cross section between them.
  • a measuring strip 25 is arranged, when stretched due to the deflection of the fork legs 9, 10 in the direction of arrows P and P1 from their mutually parallel basic position, a signal via a Line 26, 27 is given to a computer and memory, not shown, which is generally known for this purpose.
  • the spectacle lens B with the two half-waves 14, 15 performs in the example shown a repetitive, uniform oscillating movement in the direction of the arrows O and O 1 in FIG. 1 then the fork-shaped probe follows this oscillating movement of the grinding wheel.
  • These axial oscillatory movements of the half-waves or the grinding wheel can be carried out with the aid of any means familiar to a person skilled in the art, e.g. B. a reversing motor with a switching claw.
  • the rotational movement of the spectacle lens B and the oscillating movement of the spectacle lens or the grinding wheel carried out at a constant speed are coordinated with one another in such a way that the oscillating movements are repeated approximately over the width of the grinding wheel after a certain angular rotational movement of the half-waves.
  • This can be done with a tachometer for the spectacle lens half-waves and the reversing motor for the half-waves or the grinding wheel.
  • the edge of the spectacle lens B touches one of the forks 9, 10 with the glass front or glass back and deflects them slightly in the direction of the arrows P and P 1.
  • the forks 9, 10, which may have a shape adapted to the grinding wheel circumference (FIG. 7), not only give the control signal for reversing the oscillating movement via the measuring strips 25, but also distance data of the contact points BB of the front or rear edge BR 1 and BR2 (Fig. 1) of the lens rim BU with the forks 9, 10 determined. From the assignment of this data to the angular values of the lens rotation, the course of the spatial curve of the glass edge edges BR1 and BR2 the front and back of the lens can be determined.
  • FIG. 4 schematically shows the path of individual points of contact BB of the lens edge BU with the grinding wheel circumference (rolled into the plane of the drawing) and thus the path of this point of contact over the approximate width b of the grinding wheel S.
  • the point of contact of the front of the spectacle lens B with the grinding wheel S initially covers the path 50 via the grinding wheel S and then, before the oscillation movement reverses to the path 52, covers the path part 51, which is shown here greatly enlarged for the sake of clarity is.
  • the back of the spectacle lens hits the fork leg 10 and deflects it from its initial position.
  • the point of contact moves BB of the spectacle lens B on the grinding wheel S via the path 54 and the further path part 55, etc.
  • the point of contact now moves via the paths 56, 58, 60, 62 and the path parts 57, 59, 61 etc.
  • the spatial curve of the front and rear lens edge can be determined and saved in various ways.
  • the distances s1 to s7 corresponding to the paths 50, 52, 54, 56, 58, 60, 62 of the lens contact point with the wheel S are kept the same and constant from a center line M which lies in the center plane of the wheel S, ie the reversal of the oscillation movement always takes place at the same height on the wheel circumference in the vicinity of the two grinding wheel edges 40, 41 (FIGS. 1, 3 and 4).
  • a control signal is sent to the computer. This records the length of time that the point of contact BB of the spectacle lens B with the grinding wheel S (Fig.
  • Another possibility of acquiring and storing the spatial curve of the edges of the edge of the spectacle lens in terms of data results from the fact that the degree of deflection of the measuring strips 25 is recorded.
  • the different path variables of the deflection of the measuring strips 25 without time conversion result in the space curve values.
  • the oscillation movement is reversed via a time relay at a time interval after the forks 9, 10 have been touched for the first time, i.e. after the first deflection impulse of the forks and after the deflection of the fork legs is complete and has ended.
  • the fork legs 9a, 10a of the probe 70 are rigidly arranged on a head web 30 which can be pivoted about a pin 31 which is connected to the forks by means of two springs 32, 33 between the sections 34, 35 and a stationary part 36 is always returned to its starting position.
  • - Fig. 7 again illustrates the preferably curvature 37 of the Forks 9, 10 in adaptation to the circumference of the grinding wheel S.
  • the space curve of the glass circumference can be determined via the time or the path of the deflection.
  • FIG. 8 shows a further embodiment of a probe 7b, the head web 30 of which is designed and arranged like the web of the embodiment according to FIG. 6 and the fork legs 9b, 10b are rigidly connected to one another by a web 70.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Description

Die Erfindung betrifft eine Brillenglasrandschleifmaschine der im Oberbegriff der Ansprüche 1 und 2 genannten Art.The invention relates to a spectacle lens edge grinding machine of the type mentioned in the preamble of claims 1 and 2.

Durch die US-A 4 596 091 und die gleichlautende FR-A 2 543 039 ist eine Brillenglasrandschleifmaschine dieser Art bekannt, die dem Anschleifen einer Facette am Glasrand dient. Bei ihr wird die Innen- und die Außenseite des Brillenglases in Nähe des Glasumfanges durch zwei federnd gelagerte stiftförmige Fühler abgetastet, die ständig unmittelbar an dem Glas anliegen und deren axiale Stellung Potentiometern mitgeteilt wird, wobei die durch diese Potentiometer ermittelten Werte und Daten einem Rechner oder einem Datenspeicher weitergegeben werden. Eine derartige Abtastvorrichtung verursacht, wenn das Abtasten gleichzeitig mit dem Schleifen erfolgt, durch abgeschliffene Glaspartikel bedingte Schleifriefen in Nähe des Glasumfangs. Ferner bedarf es beim Einsetzen des Glases zwischen die beiden stiftförmigen Fühler des Zurückziehens eines der Fühler gegen Federkraft, um einen Abstand zwischen beiden Fühlern zu schaffen, in den der Glasrand eingsetzt werden kann.From US-A 4 596 091 and the identical FR-A 2 543 039 an eyeglass lens grinding machine of this type is known, which is used to grind a facet on the lens edge. With it, the inside and outside of the lens near the lens circumference is scanned by two spring-loaded pin-shaped sensors, which are constantly in direct contact with the lens and whose axial position is communicated to potentiometers, the values and data determined by these potentiometers being sent to a computer or be passed on to a data store. Such a scanning device, if the scanning takes place simultaneously with the grinding, causes grinding marks in the vicinity of the glass circumference caused by ground glass particles. Furthermore, when the glass is inserted between the two pin-shaped sensors, one of the sensors needs to be pulled back against spring force to create a distance between the two sensors in which the glass rim can be inserted.

Diesen bekannten Vorrichtungen gegenüber besteht die Aufgabe der Erfindung darin, eine Brillenglasrandschleifmaschine der genannten Gattung zu schaffen, bei der ein Erfassen der Daten der durch den vorderen und hinteren Brillenglasrand beschriebenen Kurve des Schleifpunktes auf dem Schleifscheibenumfang ermöglicht wird, ohne daß hierbei Schleifriefen wie bei der vorstehend beschriebenen, bekannten Maschine entstehen. - Hierzu sieht die Erfindung gemäß den kennzeichnenden Merkmalen des Anspruchs 1 vor, daß der Tastkopf mit zueinander und zu der Schleifscheibenebene parallelen Schenkeln ausgebildet ist, die an einer oder an beiden Seiten ihrer Enden mit einem Steg miteinander verbunden sind und in einem Abstand voneinander angeordnet sind, der größer als die größte Breite des Glasumfangs ist, und der Tastkopf die Berührung der Schenkel durch die Vorder- und die Rückseite des Brillenglases erfassende Elemente trägt, deren Signale durch den Rechner zur Ausführung der oszillierenden Hin- und Herbewegung der Halbwellen mit dem Brillenglas oder der Schleifscheibe mit dem Tastkopf mit einer konstanten Amplitude von einer dem Schenkelabstand entsprechenden Mindestgröße sowie zur Bestimmung der durch den äußeren und inneren Brillenglasrand beschriebenen Kurve des Schleifpunktes auf dem Schleifscheibenumfang herangezogen werden. Des weiteren sieht die Erfindung entsprechend den kennzeichnenden Merkmalen des Anspruchs 2 vor, daß der Tastkopf mit zueinander und zu der Schleifscheibenebene parallelen Schenkeln ausgebildet ist, die an einer oder an beiden Seiten ihrer Enden mit einem Steg miteinander verbunden sind und in einem Abstand voneinander angeordnet sind, der größer als die größte Breite des Glasumfangs ist und der Tastkopf die Berührung der Schenkel durch die Vorder- und die Rückseite des Brillenglases erfassende Elemente trägt, deren Signale durch den Rechner zur Ausführung der oszillierenden Hin- und Herbewegung der Halbwellen mit dem Brillenglas oder der Schleifscheibe mit dem Tastkopf mit einer Amplitudengröße, die von der jeweiligen Anlage des Brillenglases an den Schenkeln bestimmt ist, wobei die Zeitdauer der Hin- und Herbewegungen des Brillenglases oder der Schleifscheibe zwischen der vorgegebenen Brillenglasebene und den Umkehrpunkten der Hin- und Herbewegung gemessen wird und zur Bestimmung der durch den äußeren und den inneren Brillenglasrand beschriebenen Kurve des Schleifpunktes auf dem Schleifscheibenumfang herangezogen wird.Compared to these known devices, the object of the invention is to provide an eyeglass lens grinding machine of the type mentioned, in which the data of the curve of the grinding point on the grinding wheel circumference described by the front and rear eyeglass lens edge is made possible without grinding grooves as in the above described, known machine arise. - For this purpose, the invention provides according to the characterizing features of claim 1 that the probe is formed with legs parallel to each other and to the grinding wheel plane, which are connected to one another on one or both sides of their ends with a web and are arranged at a distance from one another , which is larger than the largest width of the lens circumference, and the probe carries the contact of the legs through the front and the back of the spectacle lens, the signals of which are carried out by the computer to carry out the oscillating reciprocation of the half-waves with the spectacle lens or the grinding wheel with the probe with a constant amplitude of a minimum size corresponding to the distance between the legs and for determination the curve of the grinding point on the circumference of the grinding wheel described by the outer and inner lens rim. Furthermore, the invention according to the characterizing features of claim 2 provides that the probe is formed with legs parallel to each other and to the grinding wheel plane, which are connected to one another on one or both sides of their ends with a web and are arranged at a distance from one another , which is larger than the largest width of the lens circumference and the probe carries the contact of the thighs through the front and the rear of the spectacle lens, the signals of which are carried out by the computer to carry out the oscillating back and forth movement of the half-waves with the spectacle lens or the Grinding wheel with the probe with an amplitude size, which is determined by the respective contact of the lens on the legs, wherein the time period of the back and forth movements of the lens or the grinding wheel between the predetermined lens plane and the reversal points of the back and forth movement is measured and for Bes the curve of the grinding point on the circumference of the grinding wheel described by the outer and inner rim of the lens is used.

In Weiterentwicklung der Merkmale dieser Ansprüche soll ferner gleichzeitig mit dem Erfassen der Daten der genannten Raumkurve erreicht werden, daß die Schleifscheibe auf ihrer vollen oder annähernd vollen Breite abgenutzt wird.In a further development of the features of these claims, it should also be achieved simultaneously with the acquisition of the data of the space curve mentioned that the grinding wheel is worn over its full or approximately full width.

Die DE-U 85 29 208 offenbart in dieser Beziehung eine Brillenglasrandschleifmaschine bei der die Schleifscheibe über ihre Breite dadurch gleichmäßig abgenutzt wird, daß das Brillenglas eine Hin- und Her-Bewegung über die Breite der Schleifscheibe vollführt, deren Seiten schmale abgeschrägte Anlaufflächen für die vordere bzw. rückwärtige Umfangskante des Brillenglases besitzt. Hierbei findet ein Reversiergetriebe Anwendung, das lastabhängig ist und ein Umkehren der Querbewegung des Brillenglases bewirkt, so daß diese Bewegungsumkehr stets auf derselben axialen Höhe der Schleifscheibenbreite erfolgt. - Im Gegensatz hierzu sind gemäß Anspruch 3 die das Umsteuern der Hin- und Herbewegung der Schleifscheibe oder des Brillenglases bewirkenden und im Abstand der ungefähren Schleifscheibenbreite angeordneten Tasterteile beweglich angeordnet, wobei ihre Bewegung sowohl die erwünschten Datenimpulse als auch die Umsteuersignale für die Beendigung eines Hinganges und des Beginns eines Herganges der oszillierenden Bewegung der Schleifscheibe bzw. des Brillenglases gibt.DE-U 85 29 208 discloses in this respect an eyeglass lens edge grinding machine in which the grinding wheel is evenly worn across its width in that the eyeglass lens reciprocates across the width of the grinding wheel, the sides of which are narrow beveled contact surfaces for the front or rear Has peripheral edge of the lens. Here, a reversing gear is used, which is load-dependent and reverses the transverse movement of the spectacle lens, so that this reversal of movement always takes place at the same axial height of the grinding wheel width. - In contrast to this, according to claim 3, the reversing of the back and forth movement of the grinding wheel or the spectacle lens and arranged at a distance from the approximate grinding wheel width are arranged movably, their movement being both the desired data pulses and the reversing signals for the completion of a walk and the beginning of a course of the oscillating movement of the grinding wheel or the spectacle lens.

Die Merkmale der weiteren Unteransprüche dienen der Verbesserung und Weiterentwicklung der erfindungsgemäßen Schleifmaschine.The features of the further subclaims serve to improve and further develop the grinding machine according to the invention.

Auf der Zeichnung sind Ausführungsbeispiele der wesentlichen Teile der erfindungsgemäßen Maschine dargestellt und zwar zeigt

Fig. 1
in perspektivischer Ansicht die Oberseite einer Schleifscheibe mit einem daran angeordneten Tastkopf und dem Brillenglas,
Fig. 2
eine erste Ausführungsform des gabelförmigen Tastkopfes,
Fig. 3
die Stellung einer Gabel des Tastkopfes gegenüber dem benachbarten Schleifscheibenrand,
Fig. 4 und 5
in schematischer Ansicht den Weg des Berührungspunktes des Brillenglases mit der Schleifscheibe und den Abstand dieses Punktes von der Null-Linie (Mittelebene der Schleifscheibe)
Fig. 6 bis 8
weitere vorteilhafte Ausführungsformen des gabelförmigen Tastkopfes.
In the drawing, embodiments of the essential parts of the machine according to the invention are shown and that shows
Fig. 1
a perspective view of the top of a grinding wheel with a probe attached to it and the spectacle lens,
Fig. 2
a first embodiment of the fork-shaped Probe,
Fig. 3
the position of a fork of the probe opposite the adjacent grinding wheel edge,
4 and 5
a schematic view of the path of the point of contact of the lens with the grinding wheel and the distance of this point from the zero line (center plane of the grinding wheel)
6 to 8
further advantageous embodiments of the fork-shaped probe.

Die Schleifscheibe S der Brillenglasrandschleifmaschine ist in dargestelltem Beispiel drehfest auf der längsverschieblichen Welle 1 angeordnet und wird durch diese in Drehung versetzt. Beidseitig der Schleifscheibe sind bei der Ausführungsform nach Fig. 1 bis 3 an einer nicht dargestellten Wand des Maschinengehäuses zwei parallele Streben 3, 4 vorgesehen, die in etwa senkrechte weitere Streben 5, 6 übergehen. Am Ende dieses zweiten Strebenpaares 5, 6 ist ein gabelförmiger Tastkopf angeordnet, der die allgemeine Bezugsziffer 7 trägt und der aus einem Steg 8 und zwei parallelen Gabelschenkeln 9, 10 besteht, die in ihrer Ausgangsstellung einen Abstand a von der ungefähren Breite b der Schleifscheibe voneinander haben. Die Gabelschenkel 9, 10 weisen, wie Fig. 3 zeigt, einen oberen Abschnitt 11 auf, der rechteckigen Querschnitt besitzt und an den sich ein Fußteil 12 anschließt, der schmal ausgebildet ist, von dem oberen Abschnitt 11 in Richtung auf die Mittelebene M der Schleifscheibe S (Fig. 4 und 5) gerichtet ist und dessen vorderer Rand 13 entweder spitzwinklig oder leicht abgerundet ist und der einen ganz geringen Zwischenraum zwischen sich und der Schleifscheibe beläßt.In the example shown, the grinding wheel S of the spectacle lens edge grinding machine is arranged in a rotationally fixed manner on the longitudinally displaceable shaft 1 and is set in rotation by this. In the embodiment according to FIGS. 1 to 3, two parallel struts 3, 4 are provided on both sides of the grinding wheel on a wall of the machine housing, not shown, which merge into approximately vertical further struts 5, 6. At the end of this second pair of struts 5, 6 there is a fork-shaped probe head which bears the general reference number 7 and which consists of a web 8 and two parallel fork legs 9, 10, which in their starting position are at a distance a from the approximate width b of the grinding wheel to have. The fork legs 9, 10, as shown in FIG. 3, have an upper section 11 which has a rectangular cross section and which is adjoined by a foot part 12 which is narrow, from the upper section 11 in the direction of the center plane M of the grinding wheel S (Fig. 4 and 5) is directed and the front edge 13 is either acute or slightly rounded and which leaves a very small space between itself and the grinding wheel.

Das Brillenglas B ist in bekannter Weise zwischen zwei Halbwellen 14, 15 der Maschine gehalten und durch diese in Drehung versetzt; auf der Halbwelle 14 ist die Schablone 16 drehfest angebracht, die auf einem Stützteil 17 Auflage findet.The spectacle lens B is held in a known manner between two half-shafts 14, 15 of the machine and caused to rotate by this; on the half shaft 14, the template 16 is rotatably attached, which is supported on a support part 17.

Der Steg 8 des Tastkopfes 7 besitzt zwei kurze Ansätze 18, 19, die in einer schrägen Kante 20, 21 enden (Fig. 2). Diesen liegt je eine ebenfalls schräge Kante 22, 23 der Gabelschenkel 9, 10 gegenüber, wobei die beiden schrägen Kanten 20, 22 und 21, 23 zwischen sich einen senkrechten, im Querschnitt dreieckigen Spalt 24 bilden. Zwischen den Ansätzen 18, 19 und dem diesen benachbarten Ende der Gabelschenkel 9, 10 ist je ein Meßstreifen 25 angeordnet, bei dessen Dehnung aufgrund des Auslenkens der Gabelschenkel 9, 10 in Richtung der Pfeile P und P₁ aus ihrer zueinander parallelen Grundstellung ein Signal über eine Leitung 26, 27 an einen nicht dargestellten, für diese Zwecke allgemein bekannten Rechner und Speicher gegeben wird.The web 8 of the probe 7 has two short shoulders 18, 19 which end in an oblique edge 20, 21 (FIG. 2). These are each opposite a likewise oblique edge 22, 23 of the fork legs 9, 10, the two oblique edges 20, 22 and 21, 23 forming a vertical gap 24 with a triangular cross section between them. Between the approaches 18, 19 and the adjacent end of the fork legs 9, 10, a measuring strip 25 is arranged, when stretched due to the deflection of the fork legs 9, 10 in the direction of arrows P and P₁ from their mutually parallel basic position, a signal via a Line 26, 27 is given to a computer and memory, not shown, which is generally known for this purpose.

Das Brillenglas B mit den beiden Halbwellen 14, 15 vollführt in dargestelltem Beispiel eine sich wiederholende gleichmäßige Oszillationsbewegung in Richtung der Pfeile O und O₁ in Fig. 1. - Umgekehrt können die Brillenglashalbwellen 14, 15 längsunverschieblich sein und die Schleifscheibe kann oszillierende Querbewegungen ausführen, wobei dann der gabelförmige Tastkopf dieser Oszillationsbewegung der Schleifscheibe folgt. Diese axialen Oszillationsbewegungen der Halbwellen oder der Schleifscheibe können mit Hilfe jedem Fachmann geläufiger Mittel erfolgen, z. B. einem Reversiermotor mit einer Schaltklaue.The spectacle lens B with the two half-waves 14, 15 performs in the example shown a repetitive, uniform oscillating movement in the direction of the arrows O and O 1 in FIG. 1 then the fork-shaped probe follows this oscillating movement of the grinding wheel. These axial oscillatory movements of the half-waves or the grinding wheel can be carried out with the aid of any means familiar to a person skilled in the art, e.g. B. a reversing motor with a switching claw.

Die Drehbewegung des Brillenglases B und die mit konstanter Geschwindigkeit durchgeführte Oszillationsbewegung des Brillenglases bzw. der Schleifscheibe sind derart aufeinander abgestimmt, daß die Oszillationsbewegungen annähernd über die Breite der Schleifscheibe sich nach jeweils einer bestimmten Winkeldrehbewegung der Halbwellen wiederholen. Dies kann mit einem Drehzahlmesser der Brillenglashalbwellen und dem Reversiermotor für die Halbwellen bzw. die Schleifscheibe geschehen. Am Ende jeder oszillierenden Querbewegung des Glases B über die annähernde Breite der Schleifscheibe S berührt der Rand des Brillenglases B mit der Glasvorderseite bzw. Glasrückseite eine der Gabeln 9, 10 und lenkt diese in Richtung der Pfeile P und P₁ geringfügig aus.The rotational movement of the spectacle lens B and the oscillating movement of the spectacle lens or the grinding wheel carried out at a constant speed are coordinated with one another in such a way that the oscillating movements are repeated approximately over the width of the grinding wheel after a certain angular rotational movement of the half-waves. This can be done with a tachometer for the spectacle lens half-waves and the reversing motor for the half-waves or the grinding wheel. At the end of each oscillating transverse movement of the glass B over the approximate width of the grinding wheel S, the edge of the spectacle lens B touches one of the forks 9, 10 with the glass front or glass back and deflects them slightly in the direction of the arrows P and P 1.

Die Gabeln 9, 10, die eine dem Schleifscheibenumfang angepaßte Form besitzen können (Fig. 7), geben über die Meßstreifen 25 nicht nur das Steuersignal zur Umkehr der Oszillationsbewegung, mit ihrer Hilfe werden auch Abstandsdaten der Berührungspunkte BB der vorderen oder hinteren Kante BR₁ und BR₂ (Fig. 1) des Brillenglasrandes BU mit den Gabeln 9, 10 ermittelt. Aus der Zuordnung dieser Daten zu den Winkelwerten der Brillenglasdrehung läßt sich der Verlauf der Raumkurve der Glasrandkanten BR₁ und BR₂ der Brillenglasvorder- und -rückseite ermitteln.The forks 9, 10, which may have a shape adapted to the grinding wheel circumference (FIG. 7), not only give the control signal for reversing the oscillating movement via the measuring strips 25, but also distance data of the contact points BB of the front or rear edge BR 1 and BR₂ (Fig. 1) of the lens rim BU with the forks 9, 10 determined. From the assignment of this data to the angular values of the lens rotation, the course of the spatial curve of the glass edge edges BR₁ and BR₂ the front and back of the lens can be determined.

In Fig. 4 ist schematisch der Weg einzelner Berührungspunkte BB des Brillenglasrandes BU mit dem (in die Zeichnungsebene abgerollten) Schleifscheibenumfang und damit der Weg dieses Berührungspunktes über die annähernde Breite b der Schleifscheibe S dargestellt. Es wird davon ausgegangen, daß der Berührungspunkt der Vorderseite des Brillenglases B mit der Schleifscheibe S zunächst den Weg 50 über die Schleifscheibe S zurücklegt und hiernach vor der Umkehr der Oszillationsbewegung zu dem Weg 52 den Wegteil 51 zurücklegt, der der Übersicht halber hier stark vergrößert dargestellt ist. Nach Beendigung des Weges 52 trifft die Rückseite des Brillenglases auf den Gabelschenkel 10 und lenkt diesen aus dessen Ausgangsstellung aus. Nach Zurücklegen des Wegteils 53 bewegt sich der Berührungspunkt BB des Brillenglases B auf der Schleifscheibe S über den Weg 54 und den weiteren Wegteil 55 usw. Der Berührungspunkt wandert nunmehr über die Wege 56, 58, 60, 62 und die Wegteile 57, 59, 61 usw.4 schematically shows the path of individual points of contact BB of the lens edge BU with the grinding wheel circumference (rolled into the plane of the drawing) and thus the path of this point of contact over the approximate width b of the grinding wheel S. It is assumed that the point of contact of the front of the spectacle lens B with the grinding wheel S initially covers the path 50 via the grinding wheel S and then, before the oscillation movement reverses to the path 52, covers the path part 51, which is shown here greatly enlarged for the sake of clarity is. After the end of the path 52, the back of the spectacle lens hits the fork leg 10 and deflects it from its initial position. After the path part 53 has been covered, the point of contact moves BB of the spectacle lens B on the grinding wheel S via the path 54 and the further path part 55, etc. The point of contact now moves via the paths 56, 58, 60, 62 and the path parts 57, 59, 61 etc.

Die Raumkurve der vorderen und hinteren Brillenglaskante kann auf verschiedene Weise datenmäßig ermittelt und gespeichert werden. Im ersten Fall werden die den Wegen 50, 52, 54, 56, 58, 60, 62 entsprechenden Abstände s₁ bis s₇ des Brillenglasberührungspunktes mit der Scheibe S von einer Mittellinie M, die in der Mittelebene der Schleifscheibe S liegt, gleich und konstant gehalten, d. h. die Umkehr der Oszillationsbewegung erfolgt immer auf gleicher Höhe am Scheibenumfang in Nähe der beiden Schleifscheibenränder 40, 41 (Fig. 1, 3 und 4). Bei Berührung und Beginn der Auslenkbewegung der Gabeln 9, 10 wird ein Steuersignal an den Rechner gegeben. Dieser hält die Zeitdauer fest, den der Berührungspunkt BB des Brillenglases B mit der Schleifscheibe S (Fig. 1) über jeden einzelnen Weg 50 bis 62 bzw. die Abstände s₁ bis s₇ braucht und errechnet hieraus die Lage der aufeinanderfolgenden Berührungspunkte, die die Punkte der zu ermittelnden Raumkurve der Kanten BR₁ und BR₂ der Glasvorder- bzw. rückkante sind. - In Fig. 5 sind die Wege s₁ bis s₇ dargestellt und ihnen die Zeiten t₁ bis t₇ zugeordnet. Die so gewonnenen Zeitkurven Z₁ und Z₂ versinnbildlichen die Raumkurve der Kanten BR₁ und BR₂ der Glasvorder- und der Glasrückseite. - Aus Vorstehendem wird deutlich, daß es für die Relativbewegung zwischen dem Brillenglas und der Scheibe gleichgültig ist, welcher der beiden Teile die Oszillationsbewegung ausführt.The spatial curve of the front and rear lens edge can be determined and saved in various ways. In the first case, the distances s₁ to s₇ corresponding to the paths 50, 52, 54, 56, 58, 60, 62 of the lens contact point with the wheel S are kept the same and constant from a center line M which lies in the center plane of the wheel S, ie the reversal of the oscillation movement always takes place at the same height on the wheel circumference in the vicinity of the two grinding wheel edges 40, 41 (FIGS. 1, 3 and 4). When the forks 9, 10 are touched and the deflection movement begins, a control signal is sent to the computer. This records the length of time that the point of contact BB of the spectacle lens B with the grinding wheel S (Fig. 1) over each individual path 50 to 62 or the distances s₁ to s₇ and calculates the position of the successive points of contact, which are the points of the to be determined space curve of the edges BR₁ and BR₂ of the glass front or rear edge. - In Fig. 5, the paths s₁ to s₇ are shown and assigned the times t₁ to t₇. The time curves Z 1 and thus obtained Z₂ symbolize the spatial curve of the edges BR₁ and BR₂ the glass front and the glass back. - From the above it is clear that it is irrelevant for the relative movement between the lens and the lens, which of the two parts performs the oscillating movement.

Eine andere Möglichkeit, die Raumkurve der Kanten des Brillenglasrandes datenmäßig zu gewinnen und zu speichern, ergibt sich dadurch, daß das Maß der Auslenkung der Meßstreifen 25 erfaßt wird. Hier ergeben die unterschiedlichen Weggrößen der Auslenkung der Meßstreifen 25 ohne Zeitumrechnung die Raumkurvenwerte. Dabei erfolgt die Umkehr der Oszillationsbewegung über ein Zeitrelais in zeitlichem Abstand nach der ersten Berührung der Gabeln 9, 10, d.h. nach dem ersten Auslenkimpuls der Gabeln und nachdem die Auslenkung der Gabelschenkel vollständig erfolgt und beendet ist.Another possibility of acquiring and storing the spatial curve of the edges of the edge of the spectacle lens in terms of data results from the fact that the degree of deflection of the measuring strips 25 is recorded. Here, the different path variables of the deflection of the measuring strips 25 without time conversion result in the space curve values. The oscillation movement is reversed via a time relay at a time interval after the forks 9, 10 have been touched for the first time, i.e. after the first deflection impulse of the forks and after the deflection of the fork legs is complete and has ended.

Bei der Ausführungsform des Tastkopfes 7a nach Fig. 6 sind die Gabelschenkel 9a, 10a des Tastkopfes 70 starr an einem Kopfsteg 30 angeordnet, der um einen Zapfen 31 schwenkbar ist, der mit den Gabeln mittels zweier Federn 32, 33 zwischen den Abschnitten 34, 35 und einem stationären Teil 36 immer wieder in seine Ausgangslage zurückgebracht wird. - Fig. 7 verdeutlicht nochmal die vorzugsweise Krümmung 37 der Gabeln 9, 10 in Anpassung an den Umfang der Schleifscheibe S. Auch hier kann über die Zeit oder den Weg der Auslenkung die Raumkurve des Glasumfangs bestimmt werden.In the embodiment of the probe 7a according to FIG. 6, the fork legs 9a, 10a of the probe 70 are rigidly arranged on a head web 30 which can be pivoted about a pin 31 which is connected to the forks by means of two springs 32, 33 between the sections 34, 35 and a stationary part 36 is always returned to its starting position. - Fig. 7 again illustrates the preferably curvature 37 of the Forks 9, 10 in adaptation to the circumference of the grinding wheel S. Here too, the space curve of the glass circumference can be determined via the time or the path of the deflection.

Fig. 8 zeigt eine weitere Ausführungsform eines Tastkopfes 7b, dessen Kopfsteg 30 wie der Steg der Ausführungsform nach Fig. 6 ausgebildet und angeordnet ist und dessen Gabelschenkel 9b, 10b durch einen Steg 70 miteinander starr verbunden sind.FIG. 8 shows a further embodiment of a probe 7b, the head web 30 of which is designed and arranged like the web of the embodiment according to FIG. 6 and the fork legs 9b, 10b are rigidly connected to one another by a web 70.

Claims (10)

  1. Spectacle lens edge grinding machine, comprising half-shafts (14, 15) holding the spectacle lens (B) between them and a peripheral grinding wheel (S) grinding the edge of the glass, comprising a seating (17) for a template (16) held by one of the half-shafts and comprising a sensing head (7, 7a, 7b) measuring the position of the front and rear faces of the spectacle lens (B) at the grinding position (BB) in the vicinity of its circumference relative to a predetermined plane (M), which (sensing head) is connected to a computer, characterized in that the sensing head (7, 7a, 7b) is constructed with arms (9, 9a, 9b; 10, 10a, 10b), parallel to one another and to the grinding wheel plane (M), which are connected to each other at one or both sides of their ends by a web (8, 30; 70) and are disposed at a distance (a) from each other which is greater than the maximum width of the glass periphery and that the sensing head (7, 7a, 7b) carries elements (25) for detecting contact of the arms (9, 9a, 9b; 10, 10a, 10b) with the front and rear faces of the spectacle lens (B), the signals from which elements are used by the computer for carrying out the oscillating, to-and-fro movement of the half-shafts (14, 15) together with the spectacle lens (B) or of the grinding wheel (S) together with the sensing head (7, 7a, 7b) with a constant amplitude having a minimum value corresponding to the arm spacing (a), and also for determining the curve of the grinding point on the periphery of the grinding wheel described by the outer and inner edge of the lens.
  2. Spectacle lens edge grinding machine, comprising half-shafts (14, 15) holding the spectacle lens (B) between them and a peripheral grinding wheel (S) grinding the periphery of the glass, comprising a seating (17) for a template (16) held by one of the half-shafts, and comprising a sensing head (7, 7a, 7b) measuring the position of the front and rear faces of the spectacle lens (B) at the grinding position (BB) in the vicinity of its circumference with respect to a predetermined plane (M), which (sensing head) is connected to a computer, characterized in that the sensing head (7, 7a, 7b) is equipped with arms (9, 9a, 9b; 10, 10a, 10b), parallel to one another and to the grinding wheel plane (M), which are connected to one another at one or both sides of their ends by a web (8, 30; 70) and are disposed at a distance (a) from each other which is greater than the maximum width of the glass periphery, and that the sensing head (7, 7a, 7b) carries elements (25) for detecting contact of the arms (9, 9a, 9b; 10, 10a, 10b) with the front and rear faces of the spectacle lens (B), the signals from which elements are used by the computer for carrying out the oscillating, to-and-fro movement of the half-shafts (14, 15) together with the spectacle lens (B) or of the grinding wheel (S) together with the sensing head (7, 7a, 7b) with an amplitude, the value of which is determined by the bearing each time of the spectacle lens (B) against the arms (9, 9a, 9b; 10, 10a, 10b), the length of time of the to-and-fro movement of the spectacle lens (B) or of the grinding wheel (S) between the predetermined spectacle lens plane (M) and the reversal points of the to-and-fro movement being measured, and are also used for determining the curve of the grinding point on the grinding wheel periphery described by the outer and inner spectacle lens edge.
  3. Spectacle lens edge grinding machine according to Claims 1 and 2, characterized in that the spacing of the sensing head arms (9, 9a, 9b; 10, 10a, 10b) movable transversely to the plane of the grinding wheel approximately corresponds to the width (b) of the grinding wheel (S).
  4. Spectacle lens edge grinding machine according to Claim 1, characterized in that the fork arms (9, 10) can be resiliently splayed apart from each other and carry, at their end adjacent to the web (8) of the sensing head (7), an element (25) for detecting the instant, or the instant and the amount, of the deflection of the fork arms (9, 10).
  5. Spectacle lens edge grinding machine according to Claim 4, characterized in that the element (25) is a strip strain gauge.
  6. Spectacle lens edge grinding machine according to one of claims 1 to 5, characterized in that the sensing head (7) is held by means of support bars (3-6) mounted locked against rotation on both sides of the grinding wheel (11).
  7. Spectacle lens edge grinding machine according to Claim 5 or 6, characterized in that the fork arms (9, 10) possess, in the region of each of the strain gauges (25), a wedge-shaped space (24) open towards this strain gauge.
  8. Spectacle lens edge grinding machine according to Claim 1 or 2, characterized in that the fork arms (9, 10) of the sensing head (7) are rigidly connected to a head web (30) and that the head web (30) is pivotal about a journal (31) extending transversely to the half-shafts (14, 15).
  9. Spectacle lens edge grinding machine according to Claim 8, characterized in that the head web (30) possesses two mutually opposite springs (32, 33) between a stationary component (36) and two portions (34, 35) of the web (30).
  10. Spectacle lens edge grinding machine according to Claims 8 and 9, characterized in that the ends of the sensing head arms (9b, 10b) remote from the head web (30) are connected to each other by a rigid web (70).
EP89122496A 1988-12-17 1989-12-06 Spectacle glasses bevel grinding machine Expired - Lifetime EP0374587B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842601A DE3842601A1 (en) 1988-12-17 1988-12-17 EYEWEAR EDGE GRINDING MACHINE
DE3842601 1988-12-17

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EP0374587A2 EP0374587A2 (en) 1990-06-27
EP0374587A3 EP0374587A3 (en) 1990-12-27
EP0374587B1 true EP0374587B1 (en) 1993-04-14

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EP89122496A Expired - Lifetime EP0374587B1 (en) 1988-12-17 1989-12-06 Spectacle glasses bevel grinding machine

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EP (1) EP0374587B1 (en)
JP (1) JPH06104298B2 (en)
DE (2) DE3842601A1 (en)

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Publication number Priority date Publication date Assignee Title
IT1234118B (en) * 1989-06-12 1992-04-29 Inzerillo Giuseppe Nordio Fran METHOD FOR THE PRODUCTION OF MURRINE GLASS DIALS
JP2571477B2 (en) * 1991-06-12 1997-01-16 信越半導体株式会社 Wafer notch chamfering device
DE4208835A1 (en) * 1992-03-19 1993-09-30 Wernicke & Co Gmbh Method for shape grinding the circumference of a spectacle lens
FR2697769B1 (en) * 1992-11-10 1995-01-13 Buchmann Optical Eng Automatic machine for grinding and beveling ophthalmic lenses.
DE4320934C2 (en) * 1993-06-24 1995-04-20 Wernicke & Co Gmbh Spectacle lens edge grinding machine
FR2711331B1 (en) * 1993-10-19 1996-01-26 Essilor Int Overflow machine for spectacle lenses.
DE4417533C2 (en) * 1994-05-19 1996-03-21 Wernicke & Co Gmbh Process for CNC-controlled shape grinding of the roof facet of a spectacle lens
DE19702287C2 (en) * 1997-01-23 1999-02-11 Wernicke & Co Gmbh Method for determining the course of the facets on the edge of spectacle lenses to be processed and for controlling the processing of shapes in accordance with the determined course of the facets
DE10119662C2 (en) * 2001-04-20 2003-04-10 Loh Optikmaschinen Ag Process for edge processing of optical lenses
KR101511647B1 (en) * 2014-07-17 2015-04-14 주식회사 엘티에스 Apparatus for grinding lens in rotary type

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US2559431A (en) * 1949-11-25 1951-07-03 Landis Tool Co Work locating device
US2639562A (en) * 1950-02-09 1953-05-26 Landis Tool Co Precision locating device
JPS4844915B1 (en) * 1970-07-15 1973-12-27
FR2543039B1 (en) * 1983-03-22 1985-08-09 Essilor Int METHOD FOR BEVELING AN OPHTHALMIC LENS, AND CORRESPONDING AUTOMATIC GRINDING MACHINE
DE8529208U1 (en) * 1985-10-15 1985-11-21 Wernicke & Co GmbH, 4000 Düsseldorf Lens edge grinding machine
FR2611560B1 (en) * 1987-03-05 1992-10-02 Briot Int IMPROVEMENTS IN GRINDING AND BEVELING MACHINES FOR OPHTHALMIC LENSES

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Publication number Publication date
EP0374587A2 (en) 1990-06-27
DE3842601A1 (en) 1990-07-05
JPH02224960A (en) 1990-09-06
US4964239A (en) 1990-10-23
DE3842601C2 (en) 1990-10-04
JPH06104298B2 (en) 1994-12-21
EP0374587A3 (en) 1990-12-27
DE58904076D1 (en) 1993-05-19

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