EP0706439B1 - Spectacle lens edge grinding machine - Google Patents

Spectacle lens edge grinding machine Download PDF

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Publication number
EP0706439B1
EP0706439B1 EP94920937A EP94920937A EP0706439B1 EP 0706439 B1 EP0706439 B1 EP 0706439B1 EP 94920937 A EP94920937 A EP 94920937A EP 94920937 A EP94920937 A EP 94920937A EP 0706439 B1 EP0706439 B1 EP 0706439B1
Authority
EP
European Patent Office
Prior art keywords
spectacle
lens
spectacle lens
grinding
measured
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
EP94920937A
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German (de)
French (fr)
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EP0706439A1 (en
Inventor
Lutz Gottschald
Klaus Eickmeyer
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Wernicke and Co GmbH
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Wernicke and Co GmbH
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Publication date
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Publication of EP0706439A1 publication Critical patent/EP0706439A1/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B24B9/148—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms electrically, e.g. numerically, controlled

Definitions

  • the invention relates to a spectacle lens edge grinding machine, in which the spectacle lens is given its circumferential contour by pre-grinding, then subjected to a finish grinding, in particular a facet grinding, the circumferential data of the contour-contoured glass is determined, entered into a computer and the radial movement and possibly the axial movement of the spectacle lens relative to the The grinding wheel can be controlled by the computer using this circumferential data for a subsequent corrective grinding.
  • the data determining the circumferential contour of the spectacle lens is determined during or after the fine grinding by means of a contactless measuring transducer arranged in a housing of the spectacle lens edge grinding machine and input to the computer.
  • the ascertained actual values of the circumferential contour are compared in the computer with target values of the circumferential contour stored therein, and the achievement or exceeding of a predeterminable permissible deviation is determined, the final grinding being carried out in a controlled manner only if the permissible deviation is exceeded with the correction values resulting from this.
  • the invention has for its object to avoid the disadvantages of the known spectacle lens edge grinding machine and to design the transducer so that it provides sufficiently accurate measurement results with a simple structure regardless of the atmosphere prevailing in the housing of the spectacle lens edge grinding machine, the resulting contamination and any deposits. Furthermore, the measurement results should also take into account changes in the roof facet due to the wear of a grinding wheel used to manufacture the roof facet.
  • an eyeglass lens grinding machine of the type mentioned at the outset it has at least one support interacting with a contour-ground eyeglass lens and at least one measurement sensor for receiving an actual value of the circumferential contour with reference to the support.
  • this support can be connected fixedly or displaceably to a machine frame of the spectacle lens edge grinding machine.
  • the eyeglass lens is converted onto this support after it has been ground contour-contoured, and the radius of a predeterminable, associated angle of at least one circumferential point of the peripheral contour-ground spectacle lens is measured with reference to the support.
  • the support can be arranged anywhere in the housing of the lens edge grinding machine, but must be accessible as a support for the contour-contoured lens.
  • a particularly simple and preferred embodiment of the support results if it consists of narrow rings or ring segments which are arranged on the side of the grinding wheel or grinding wheels and are fixed with respect to the grinding wheels and to which the spectacle lens is converted after grinding the peripheral contour.
  • the probe can have at least one radius value a keyway with a wedge angle that is the same as the permissible maximum acute angle of a roof facet on the spectacle lens.
  • the result is a measurement value that depends exclusively on the radial wear of the grinding wheel, as long as the angle of the roof facet of the contoured spectacle lens does not exceed the angle of the keyway on the probe. Until equality of angles is reached, it is sufficient to carry out a correction grinding that the linear Deviation corresponds.
  • the lens edge grinding machine can end the grinding process and emit a signal which gives the operator an indication that the grinding wheel must be dressed or has become unusable.
  • the probe has a flat area with the position of the spectacle lens unchanged and at least one radius value of the tip of the roof facet in the key groove and another radius value with respect to the flat area. From the difference between these values and the target value, it can easily be determined whether the change is still within permissible limits or not.
  • the grinding wheel (s) can preferably be closely surrounded by a fixed splash guard with the exception of the grinding area and the rings or ring segments can be arranged on the splash guard.
  • These rings or ring segments can preferably be arranged on both sides of a pre-grinding wheel and can be designed as a probe for measuring the spatial curve of the peripheral lens contour.
  • a pre-grinding wheel can be designed as a probe for measuring the spatial curve of the peripheral lens contour.
  • Such a device is described in German Patent 38 42 601 of the applicant and is used to the front and rear space curve Determine the circumferential contour of the shape-ground spectacle lens and the respective lens thickness. This is achieved in that the spectacle lens holding shaft with the spectacle lens or the grinding wheel with the probe head oscillate back and forth movements. On the one hand, this serves to ensure uniform wear of the pre-grinding wheel and, on the other hand, to measure the spatial curves and the glass thickness of the shape-ground spectacle lens.
  • the computer available for the device according to German Patent 38 42 601 can be used to change the axial position of the lens holding shaft with the lens relative to the grinding wheel in accordance with the spatial curve of the lens contour not only for the controlled grinding of a roof facet, but also when recording the actual values of the circumferential contour using the rings or ring segments.
  • These can therefore be made very narrow, since by controlling the axial position of the spectacle lens holding shaft with the spectacle lens relative to the grinding wheel in accordance with the spatial curve of the spectacle lens contour, there is no danger that the spectacle lens will leave the area of the support when measuring the peripheral contour and onto the pre-grinding wheel or the Finished grinding wheel or the spaces in between.
  • the contact between the spectacle lens and the rings or ring segments can be brought about by a drive which has an adjustable clutch, the clutch torque of which changes in the sense of a reduction in the recording of the actual values, the circumferential contour can be changed by means of a switching device.
  • the grinding wheel with its drive is arranged displaceably on a cross slide relative to the glass holding shaft rotatably arranged in the machine frame, the Arrange the transducer so that it measures the displacement of the cross slide in the machine frame relative to the circumferential contour of the contour-contoured spectacle lens. Since the cross slide is arranged in the machine frame outside a trough that collects the coolant and the grinding abrasion, the measuring sensor is also not negatively influenced by the atmosphere prevailing in the area of the grinding wheels and the spectacle lens to be ground.
  • the senor can be arranged with respect to the glass holding shaft if it is axially and radially movable on the machine frame relative to the rotating grinding wheels in order to measure the actual values of the peripheral contour.
  • a digital sensor can be used, the measured values of which are sent directly to the computer and processed there.
  • the method according to the invention for machining the edges of spectacle lenses by means of the above-described spectacle lens edge grinding machine can preferably consist in that the radius of a predeterminable, associated angle of at least one circumferential point of the circumferential contour of a shape-ground spectacle lens is measured with reference to a support, the measured value entered into a computer with compared to a stored target value and, if a permissible deviation of the actual value from the target values which can be entered into the computer is exceeded, an additional grinding process of the peripheral contour is carried out with a correction corresponding to the deviation.
  • the radius of at least one circumferential point of a roof facet of the contour-contoured spectacle lens can preferably be measured with reference to a keyway in the support, as a result of which it can be seen whether the angle of the roof facet is still in the range of a permissible value.
  • an additional grinding process can be used to create a still usable spectacle lens with a correction corresponding to the deviation.
  • the angle of the roof facet of the contour-contoured spectacle lens is greater than the angle of the keyway, this means that the grinding wheel used to grind the roof facet must be dressed or has become unusable. This is indicated by the machine with a corresponding signal.
  • the radius of at least one circumferential point of the roof facet of the contour-contoured spectacle lens is measured both with reference to the keyway in the support and with reference to a flat area of the support, it can be determined in a simple manner by comparing these measured values whether a correction of the with reference to the keyway measured deviation of the actual value from the target value is still possible or whether the spectacle lens must be reground with a new or dressed grinding wheel.
  • the entire circumferential contour is corrected according to the deviation measured at this point. If this deviation only results from wear of the pre-grinding wheel or the finishing grinding wheel, which is usually evenly distributed over the circumference, this correction can already be used to produce a sufficiently precisely contoured lens that is dimensionally accurate enough to be used directly in a specific eyeglass frame become.
  • the deviations on the circumferential contour can be of different sizes, these deviations being determined by the shape of the spectacle lens and the space curve of the circumferential contour, greater accuracy of the correction grinding can be achieved if the entire circumferential contour is measured with the stored target values compared, if the permissible deviation of the actual values from the target values which can be input to the computer is exceeded, the computer averages the measured deviations and the additional grinding process of the peripheral contour is carried out in accordance with the averaged values.
  • a correction grinding is carried out in order to keep the actual value of the circumferential values at 0: 0.3 mm compared to the target values.
  • this measurement can be carried out at an increased rotational speed of the spectacle lens holding shaft compared to the grinding process.
  • the correction according to the invention of the peripheral contour grinding of an eyeglass lens can be carried out with eyeglass lens edge grinding machines in which the eyeglass lens contour is predetermined by a template.
  • This template is fastened to the spectacle lens holding shaft and rests on an adjustable counter bearing, which can be adjusted by the computer according to the invention for a correction grinding in the manner described.
  • the computer only serves to determine the relative axial displacement of the grinding wheel and the peripheral contour-ground lens when grinding a facet, the measurement of the peripheral contour and the possibly to control required correction grinding.
  • the peripheral contour of a spectacle lens can be ground in the form of a quantity of data.
  • the template corresponding to the lens contour can be replaced by a circular disk and the abutment is given a movement by the computer, which results in the lens contour to be ground.
  • a cross slide 2 is arranged on a machine frame 1, the slide part 3 of which has guide rods 4, which are mounted in bores 5 of projections 6 of a slide part 7 so as to be displaceable radially to an eyeglass lens holding shaft 14 with an eyeglass lens 24 held thereby.
  • the slide part 7 is via guide rails 8 on the machine frame 1 in a direction parallel to the spectacle lens holding shaft 14 and a shaft 10 for a pre-grinding wheel 11 and one coaxially arranged therewith Finished and / or facet grinding wheel 12 arranged with a facet groove 33.
  • the shaft 10 is supported on the slide part 3 by means of bearing supports 9.
  • the grinding wheels 11, 12 and the spectacle lens 24 with their shafts 10, 14 are surrounded by a housing 13 which has a trough, not shown in detail below, which prevents coolant and grinding abrasion from reaching the cross slide 2.
  • An angle encoder 15 is connected to the spectacle lens holding shaft 14 and is connected to a computer 16.
  • a transducer 17 is arranged on the slide part 7 and absorbs the radial displacement of the slide part 3 with respect to the spectacle lens holding shaft 14. This transducer 17 is also connected to the computer 16.
  • the radial displacement of the slide part 3 is brought about by a drive motor 18 which is controlled by the computer 16 via control connections 21 and which is in drive connection with the guide rods 4 via an electromagnetic clutch 19.
  • peripheral contour values for a wide variety of spectacle lens shapes are stored as polar coordinates.
  • a lens blank is clamped into the lens holder shaft 14 and brought into contact with the pre-grinding disk 11.
  • the contact pressure which arises in this case results from the setting of the electromagnetic clutch 19 and can be set differently for spectacle lenses made of plastic or silicate glass and in accordance with the edge thickness of the spectacle lens depending on the optical values of the spectacle lens.
  • the spectacle lens 24 is rotated with its shaft 14 in a known manner, the speed of rotation usually being at 10 to 13 rpm.
  • the angle encoder 15 transmits the computer 16 at equal angular intervals, for. B. in increments of 6 °, a pulse, which causes the computer 16 to set the associated radius of the spectacle lens to be ground via the drive motor 18.
  • the slide part 7 and thus the grinding wheel 11 are set into an oscillating movement parallel to the axis of rotation of the spectacle lens 24, which is reversed in the opposite direction at the edge of the pre-grinding wheel 11. This movement is controlled by a drive, not shown, for the slide part 7, which is also connected to the computer 16.
  • ring segments 23 are arranged, which are fastened to a splash guard 22 which closely surrounds the pre-grinding wheel 11 and the finished grinding wheel 12 and which is only open in the area of contact with the spectacle lens 24.
  • the ring segments 23 serve as buttons and are connected to a sensor 26, shown schematically in FIG. 2, which in turn is connected to the computer 16 via a control line connection 27.
  • the oscillating movements of the slide part 7 and thus the grinding wheels 11, 12 and the surrounding protection 22 are controlled in the manner described in the German patent 38 42 601 by the sensor 26 and at the same time serve the circumferentially contoured spectacle lens 24 with respect to the spatial curve of the front - and back and the glass thickness to be measured. These measured values are used to grind a facet to the peripheral contour-ground spectacle lens by means of the facet groove 33 in the finish grinding wheel 12, the course of which can be controlled by means of the computer 16.
  • the spectacle lens 24 is automatically moved onto the finish grinding wheel 12 and positioned in relation to the facet groove 33.
  • the spectacle lens 24 has sufficient machining allowance for the final grinding.
  • the spectacle lens 24, controlled by the computer 16 is placed in an exact position on one of the ring segments 23.
  • the ring segment 23 serves as a support for measuring the distance between the spectacle lens holding shaft 14 and this ring segment 23.
  • Which point of the spectacle lens 24 is placed on the ring segment 23 is determined by the computer 16 on the basis of input commands. In the simplest case, it is sufficient to carry out a single distance measurement, determine the deviation of the actual value for this point from the corresponding target value, which is stored in the target value memory 20, and one by the computer 16 when a predeterminable deviation is exceeded carry out another fine adjustment with correction of this deviation.
  • This method with detection of only one measuring point presupposes that the deviations on the entire circumferential contour are essentially the same everywhere.
  • a measurement is more precise if the entire spectacle lens contour 25 is carried out over a complete revolution of the spectacle lens 24 with contact with the ring segment 23. Since the ring segments 23 are very narrow in order to keep the axial extent of the grinding wheels 11, 12 in the splash guard 22 as small as possible, the computer 16 gives the slide part 7 a movement parallel to the axis of the shaft 14, which takes into account the spatial curve of the lens contour or the facet , so that the spectacle lens 24 remains on the ring segment 23 during this one revolution for measuring the circumferential contour.
  • the distance values of the spectacle lens 24 are recorded by means of the sensor 17 and fed into the computer 16, where the comparison with the target values is carried out.
  • the computer 16 can either average this deviation over the circumference and set a correction grinding according to this mean value or the deviations are registered point by point, compared with the corresponding target values and correction grinding is only carried out where a deviation actually occurred.
  • FIG. 7 shows a finished grinding wheel 12 with a facet groove 33 in solid lines, which has an angle ⁇ 1 which is smaller than the usual angle of a facet groove in an eyeglass frame.
  • a precisely contoured lens can therefore be easily inserted into a corresponding eyeglass frame and rests with the tip of the roof facet on the facet base of the eyeglass frame.
  • This state is shown in FIG. 3 with reference to a keyway 28 in the ring segment 23.
  • This keyway 28 is provided with an angle ⁇ o , which is greater than the angle ⁇ 1 of the facet groove 33 in the finish grinding wheel 12 and approximately equal to the angle of the facet groove in the usual eyeglass frames.
  • the radius R 1 can be measured for the point. If this measured radius R 1 deviates from a predetermined target value and is too large, the spectacle lens 24 is automatically returned to the finish grinding wheel 12 and a corrective grinding is carried out.
  • the facet groove in the finished grinding wheel 12 wears out and initially assumes a shape which is denoted by the reference number 34 in FIG. 7 and is hatched.
  • the angle of this facet groove of a worn finished grinding wheel 12 is denoted by ⁇ 2 . It can be seen that at the same time the depth of the facet groove 34 has increased by the amount ⁇ 1 .
  • a contour-ground spectacle lens 24 with a roof facet, which has the angle ⁇ 2 is inserted into the keyway 28 of the ring segment 23 according to FIG. 4, a measured radius R 2 results, which is around the value ⁇ 1 > R 1 .
  • a correction grinding can be carried out, which reduces the contour-ground spectacle lens 24 by the value ⁇ 1 .
  • This limit value can be determined very easily if, how 6, after the measurement of the radii R 1 , R 2 or R 3 with respect to the keyway 28, a further radius R 4 is measured by the peripheral contour-ground spectacle lens 24 with its roof facet 30, 31, 32 on a flat surface Area 29 of the ring segment 23 is placed.
  • the difference between the radii R 1 , R 2 or R 3 and the radius R 4 directly results in a value which becomes greater than zero when ⁇ 3 becomes greater than ⁇ o .
  • the comparison measurement only needs to be carried out with respect to a radius of the contour-ground spectacle lens 24, while for an exact correction grinding the entire circumference of the spectacle lens 24 can be measured in the keyway 28 or on the flattened region 29 of the ring segment 23.
  • the device and the method according to the invention are suitable for use with fully automatic, CNC-controlled spectacle lens edge grinding machines.
  • the stored nominal values of the peripheral contour serve to control the cross slide carrying the grinding wheels 11 and 12 in such a way that the required spectacle lens circumferential contour is created directly.
  • the method and the device according to the invention are also suitable for use with spectacle lens edge grinding machines, in which the computer 16 only serves to compare the actual values of the shaped spectacle lens 24 with the stored nominal values of the peripheral contour and to carry out a correction grinding during the actual shape grinding of the spectacle lens by means of a shaping disc with the shape arranged on the spectacle lens holding shaft 14 of the spectacle lens to be ground is controlled.
  • the shaped wheel rests in a known manner on an abutment which is connected to the slide part 3 and causes the grinding wheels 11, 12 and the slide part 3 to be displaced.
  • the abutment is adjusted by the computer 16 in accordance with the deviation found.
  • the abutment can also be used, under computer control, to cause the slide part 3 and thus the grinding wheels 11, 12 to be displaced if a circular disk rests on the abutment instead of a shaped disk with the peripheral contour of the spectacle lens to be ground.
  • the measurement of the contour-contoured spectacle lens 24 can be carried out on a very narrow support in the form of the ring segment 23 if the spectacle lens 24 on the spectacle lens holding shaft 14 is displaced in the axial direction in accordance with its spatial curve.
  • This shift in the axial direction can also be purely mechanical, for. B. done by Panhard rod.
  • the circumferential contour of the spectacle lens 24 can be measured after the pre-grinding on the pre-grinding disc 11. This is advantageous since the pre-grinding wheel 11 wears out faster than the fine grinding wheel 13. a renewed measurement of the circumferential contour after the final grinding can then be dispensed with entirely. However, a measurement of the circumferential contour and, if necessary, a corrective grinding can also be carried out after the final grinding.
  • the rotational speed of the spectacle lens holding shaft 14 can be increased in order to be able to carry out the measurement more quickly. It can be via the computer 16 Control command are given to the magnetic coupling 19, which reduces the contact pressure during measurement compared to the grinding pressure, so that wear or scoring on the ring segment 23 or on the periphery of the glasses are avoided.
  • the invention can also be used in an analogous manner with a spectacle lens edge grinding machine in which the grinding wheels can only rotate, but are otherwise stationary, while the spectacle lens holding shaft is mounted so that it can move radially and axially with respect to the grinding wheels.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

A spectacle lens edge grinding machine with at least one grinding wheel, a spectacle lens holding shaft at least radially adjustable in relation to the grinding wheel, at least one bearing operating in contact together with the circumferentially ground spectacle lens, a transducer to detect at least one actual value of the circumferential outline in relation to the bearing, a computer controlling the spectacle lens edge grinding machine and comparing the reference values of the circumferential outline stored in it with at least one of the measured actual values of the circumferential outline of the spectacle lens to be ground. Said computer also controls an additional grinding process in the event of a permissible deviation relative to the actual value or values, deviation which can be input as permissible deviation into the computer.

Description

Die Erfindung betrifft eine Brillenglasrandschleifmaschine, bei der das Brillenglas durch einen Vorschliff seine Umfangskontur erhält, anschließend einem Fertigschliff, insbesondere einem Facettenschliff unterworfen wird, die Umfangsdaten des umfangskonturgeschliffenen Glases ermittelt, einem Rechner eingegeben und die Radialbewegung und ggf. die Axialbewegung des Brillenglases relativ zu der Schleifscheibe für einen sich ggf. anschließenden Korrekturschliff mit Hilfe dieser Umfangsdaten durch den Rechner gesteuert werden.The invention relates to a spectacle lens edge grinding machine, in which the spectacle lens is given its circumferential contour by pre-grinding, then subjected to a finish grinding, in particular a facet grinding, the circumferential data of the contour-contoured glass is determined, entered into a computer and the radial movement and possibly the axial movement of the spectacle lens relative to the The grinding wheel can be controlled by the computer using this circumferential data for a subsequent corrective grinding.

Eine derartige Vorrichtung ist in der deutschen Patentschrift 40 12 660 der Anmelderin beschrieben. Bei dieser Vorrichtung werden die die Umfangskontur des Brillenglases bestimmenden Daten während oder nach dem Feinschliff mittels eines berührungslos arbeitenden, in einem Gehäuse der Brillenglasrandschleifmaschine angeordneten Meßwertaufnehmers ermittelt und dem Rechner eingegeben. Die ermittelten Ist-Werte der Umfangskontur werden in dem Rechner mit darin gespeicherten Soll-Werten der Umfangskontur verglichen und das Erreichen oder Überschreiten einer vorbestimmbaren zulässigen Abweichung festgestellt, wobei der Fertigschliff nur bei Überschreiten der zulässigen Abweichung mit den aus dieser folgenden Korrekturwerten gesteuert durchgeführt wird.Such a device is described in the German patent specification 40 12 660 by the applicant. In this device, the data determining the circumferential contour of the spectacle lens is determined during or after the fine grinding by means of a contactless measuring transducer arranged in a housing of the spectacle lens edge grinding machine and input to the computer. The ascertained actual values of the circumferential contour are compared in the computer with target values of the circumferential contour stored therein, and the achievement or exceeding of a predeterminable permissible deviation is determined, the final grinding being carried out in a controlled manner only if the permissible deviation is exceeded with the correction values resulting from this.

Obwohl sich das Prinzip der Ermittlung der Ist-Werte der Umfangskontur des formgeschliffenen Brillenglases und der sich daraus ggf. ergebende Korrekturschliff in der Anwendung bewährt haben, hat sich in der Praxis gezeigt, daß berührungslos arbeitende, im Gehäuse angeordnete Meßwertaufnehmer nachteiligerweise durch die im Gehäuse der Brillenglasrandschleifmaschine im Bereich des Brillenglases herrschende Atmosphäre, die von abgeschleudertem Kühlmittel und Schleifabrieb mehr oder weniger ungleichmäßig belastet ist, beeinflußt werden, so daß es erforderlich ist, wenn genaue Meßergebnisse und daraus folgend genaue Schleifergebnisse erzielt werden sollen, ein häufiges Reinigen durchzuführen.Although the principle of determining the actual values of the circumferential contour of the shape-ground spectacle lens and the corrective grinding that may result therefrom has proven its worth in practice, it has been shown in practice that contactless ones arranged in the housing Measurement sensors are adversely affected by the atmosphere in the housing of the spectacle lens edge grinding machine in the area of the spectacle lens, which is more or less unevenly loaded by centrifuged coolant and grinding abrasion, so that it is necessary if precise measurement results and consequently exact grinding results are to be achieved perform frequent cleaning.

Beim Schleifen einer Dachfacette eines Brillenglases ergibt sich eine Abnutzung der Schleifscheibe in der Facettennut, die nicht nur zu einer Vergrößerung des fertiggeschliffenen Brillenglases führt, sondern auch zu einer Vergrößerung des spitzen Winkels der Dachfacette, d. h. zu einer Abflachung. Die Abflachung der Dachfacette läßt sich bis zu einem gewissen Grad hinnehmen, solange das Brillenglas sicher in der Facettennut des betreffenden Brillengestells aufgenommen wird. Voraussetzung hierfür ist, daß das umfangskonturgeschliffene Brillenglas einen Korrekturschliff erhält, der die Abflachung der Dachfacette berücksichtigt.When grinding a roof facet of a spectacle lens, there is wear of the grinding wheel in the facet groove, which not only leads to an enlargement of the finished ground spectacle lens, but also to an increase in the acute angle of the roof facet, i. H. to a flattening. The flattening of the roof facet can be tolerated to a certain extent as long as the spectacle lens is securely received in the facet groove of the spectacle frame in question. The prerequisite for this is that the contour-contoured spectacle lens is given a corrective cut that takes into account the flattening of the roof facet.

Der Erfindung liegt die Aufgabe zugrunde, die Nachteile der bekannten Brillenglasrandschleifmaschine zu vermeiden und den Meßwertaufnehmer so zu gestalten, daß er bei einfachem Aufbau unabhängig von der in dem Gehäuse der Brillenglasrandschleifmaschine herrschenden Atmosphäre, den sich ergebenden Verschmutzungen und ggf. Ablagerungen ausreichend genaue Meßergebnisse liefert. Des weiteren sollen die Meßergebnisse zusätzlich Veränderungen der Dachfacette aufgrund der Abnutzung einer zum Herstellen der Dachfacette benutzten Schleifscheibe berücksichtigen.The invention has for its object to avoid the disadvantages of the known spectacle lens edge grinding machine and to design the transducer so that it provides sufficiently accurate measurement results with a simple structure regardless of the atmosphere prevailing in the housing of the spectacle lens edge grinding machine, the resulting contamination and any deposits. Furthermore, the measurement results should also take into account changes in the roof facet due to the wear of a grinding wheel used to manufacture the roof facet.

Ausgehend von dieser Aufgabenstellung wird bei einer Brillenglasrandschleifmaschine der eingangs erwähnten Art vorgeschlagen, daß sie wenigstens ein berührend mit einem umfangskonturgeschliffenen Brillenglas zusammenwirkendes Auflager und einen Meßwertaufnehmer zum Aufnehmen wenigstens eines Ist-Wertes der Umfangskontur mit bezug auf das Auflager aufweist.On the basis of this task, it is proposed in an eyeglass lens grinding machine of the type mentioned at the outset that it has at least one support interacting with a contour-ground eyeglass lens and at least one measurement sensor for receiving an actual value of the circumferential contour with reference to the support.

Dieses Auflager kann bezüglich der Brillenglashaltewelle und dem davon gehaltenen Brillenglas fest oder verschiebbar mit einem Maschinengestell der Brillenglasrandschleifmaschine verbunden sein. Auf dieses Auflager wird das Brillenglas, nachdem es umfangskonturgeschliffen wurde, umgesetzt, und der Radius eines vorbestimmbaren, zugehörigen Winkels wenigstens eines Umfangspunktes des umfangskonturgeschliffenen Brillenglases wird mit bezug auf das Auflager gemessen.With respect to the spectacle lens holding shaft and the spectacle lens held thereby, this support can be connected fixedly or displaceably to a machine frame of the spectacle lens edge grinding machine. The eyeglass lens is converted onto this support after it has been ground contour-contoured, and the radius of a predeterminable, associated angle of at least one circumferential point of the peripheral contour-ground spectacle lens is measured with reference to the support.

Grundsätzlich läßt sich das Auflager an beliebiger Stelle im Gehäuse der Brillenglasrandschleifmaschine anordnen, muß jedoch für das umfangskonturgeschliffene Brillenglas als Auflager erreichbar sein. Eine besonders einfache und bevorzugte Ausführungsform des Auflagers ergibt, wenn dieses aus seitlich der Schleifscheibe bzw. Schleifscheiben angeordneten schmalen, bezüglich der Schleifscheiben feststehenden Ringen bzw. Ringsegmenten besteht, auf die das Brillenglas nach dem Schleifen der Umfangskontur umgesetzt wird.Basically, the support can be arranged anywhere in the housing of the lens edge grinding machine, but must be accessible as a support for the contour-contoured lens. A particularly simple and preferred embodiment of the support results if it consists of narrow rings or ring segments which are arranged on the side of the grinding wheel or grinding wheels and are fixed with respect to the grinding wheels and to which the spectacle lens is converted after grinding the peripheral contour.

Um Veränderungen der Dachfacette aufgrund der Abnutzung einer zum Herstellen der Dachfacette benutzten Schleifscheibe bei den Meßergebnissen zu berücksichtigen, kann der Tastkopf zum Aufnehmen wenigstens eines Radiuswertes eine Keilnut mit einem dem zulässigen maximalen spitzen Winkel einer Dachfacette am Brillenglas gleichen Keilwinkel aufweisen.In order to take changes in the roof facet due to the wear of a grinding wheel used to manufacture the roof facet into account in the measurement results, the probe can have at least one radius value a keyway with a wedge angle that is the same as the permissible maximum acute angle of a roof facet on the spectacle lens.

Wird das umfangskonturgeschliffene Brillenglas in die Keilnut eingesetzt, so ergibt sich solange ein ausschließlich von der radialen Abnutzung der Schleifscheibe abhängiger Meßwert, solange der Winkel der Dachfacette des konturgeschliffenen Brillenglases den Winkel der Keilnut am Tastkopf nicht überschreitet. Bis Winkelgleichheit erreicht ist, genügt es, einen Korrekturschliff vorzunehmen, der der linearen Abweichung entspricht.If the circumferentially contoured spectacle lens is inserted into the keyway, the result is a measurement value that depends exclusively on the radial wear of the grinding wheel, as long as the angle of the roof facet of the contoured spectacle lens does not exceed the angle of the keyway on the probe. Until equality of angles is reached, it is sufficient to carry out a correction grinding that the linear Deviation corresponds.

Ist die Abnutzung der für den Facettenschliff benutzten Schleifscheibe allerdings so groß, daß der Winkel der Dachfacette größer ist als der Winkel der Keilnut am Tastkopf, kann das zu vermessende Brillenglas mit seiner Dachfacette nicht mehr vollständig in die Keilnut eintauchen, so daß eine größere Abweichung gemessen wird als der linearen Durchmesserveränderung der Schleifscheibe entspricht. In diesem Fall kann die Brillenglasrandschleifmaschine den Schleifvorgang beenden und ein Signal abgeben, das dem Betreiber einen Hinweis gibt, daß die Schleifscheibe abgerichtet werden muß bzw. unbrauchbar geworden ist.However, if the grinding wheel used for the facet grinding is so worn that the angle of the roof facet is greater than the angle of the keyway on the probe, the eyeglass lens with its roof facet can no longer be completely immersed in the keyway, so that a larger deviation is measured is considered to correspond to the linear change in diameter of the grinding wheel. In this case, the lens edge grinding machine can end the grinding process and emit a signal which gives the operator an indication that the grinding wheel must be dressed or has become unusable.

Besonders einfach läßt sich feststellen, ob der Winkel der Dachfacette am konturgeschliffenen Brillenglas einen vorbestimmten Wert überschritten hat, wenn der Tastkopf zusätzlich zur Keilnut einen flachen Bereich bei unveränderter Lage des Brillenglases aufweist und wenigstens ein Radiuswert der Spitze der Dachfacette in der Keilnut und ein weiterer Radiuswert mit Bezug auf den flachen Bereich aufgenommen wird. Aus der Differenz dieser Werte im Vergleich zu dem Soll-Wert läßt sich ohne weiteres ermitteln, ob die Veränderung noch innerhalb zulässiger Grenzen liegt oder nicht.It is particularly easy to determine whether the angle of the roof facet on the contoured spectacle lens has exceeded a predetermined value if, in addition to the key groove, the probe has a flat area with the position of the spectacle lens unchanged and at least one radius value of the tip of the roof facet in the key groove and another radius value with respect to the flat area. From the difference between these values and the target value, it can easily be determined whether the change is still within permissible limits or not.

Vorzugsweise können die Schleifscheibe(n) von einem feststehenden Spritzschutz mit Ausnahme des Schleifbereichs eng umgeben und die Ringe bzw. Ringsegmente an dem Spritzschutz angeordnet sein.The grinding wheel (s) can preferably be closely surrounded by a fixed splash guard with the exception of the grinding area and the rings or ring segments can be arranged on the splash guard.

Diese Ringe bzw. Ringsegmente können vorzugsweise beiderseits einer Vorschleifscheibe angeordnet und als Tastkopf zum Vermessen der Raumkurve der Brillenglasumfangskontur ausgebildet sein. Eine derartige Vorrichtung ist in der deutschen Patentschrift 38 42 601 der Anmelderin beschrieben und dient dazu, die vordere und hintere Raumkurve der Umfangskontur des formgeschliffenen Brillenglases sowie die jeweilige Glasdicke zu ermitteln. Dies wird dadurch erreicht, daß die Brillenglashaltewelle mit dem Brillenglas oder die Schleifscheibe mit dem Tastkopf relativ zueinander oszillierende Hin- und Herbewegungen ausführen. Dies dient einerseits dazu, eine gleichmäßige Abnutzung der Vorschleifscheibe zu gewährleisten und andererseits dazu, die Raumkurven und die Glasdicke des formgeschliffenen Brillenglases zu messen. Auf diese Weise läßt sich der für die Vorrichtung gemäß der deutschen Patentschrift 38 42 601 vorhandene Rechner verwenden, die axiale Lage der Brillenglashaltewelle mit dem Brillenglas relativ zur Schleifscheibe entsprechend der Raumkurve der Brillenglaskontur nicht nur zum gesteuerten Schleifen einer Dachfacette zu verändern, sondern auch beim Aufnehmen der Ist-Werte der Umfangskontur mittels der Ringe bzw. Ringsegmente. Diese lassen sich daher sehr schmal ausführen, da durch die Steuerung der axialen Lage der Brillenglashaltewelle mit dem Brillenglas relativ zur Schleifscheibe entsprechend der Raumkurve der Brillenglaskontur keine Gefahr besteht, daß das Brillenglas beim Vermessen der Umfangskontur den Bereich des Auflagers verläßt und auf die Vorschleifscheibe oder die Fertigschleifscheibe oder die Zwischenräume gerät.These rings or ring segments can preferably be arranged on both sides of a pre-grinding wheel and can be designed as a probe for measuring the spatial curve of the peripheral lens contour. Such a device is described in German Patent 38 42 601 of the applicant and is used to the front and rear space curve Determine the circumferential contour of the shape-ground spectacle lens and the respective lens thickness. This is achieved in that the spectacle lens holding shaft with the spectacle lens or the grinding wheel with the probe head oscillate back and forth movements. On the one hand, this serves to ensure uniform wear of the pre-grinding wheel and, on the other hand, to measure the spatial curves and the glass thickness of the shape-ground spectacle lens. In this way, the computer available for the device according to German Patent 38 42 601 can be used to change the axial position of the lens holding shaft with the lens relative to the grinding wheel in accordance with the spatial curve of the lens contour not only for the controlled grinding of a roof facet, but also when recording the actual values of the circumferential contour using the rings or ring segments. These can therefore be made very narrow, since by controlling the axial position of the spectacle lens holding shaft with the spectacle lens relative to the grinding wheel in accordance with the spatial curve of the spectacle lens contour, there is no danger that the spectacle lens will leave the area of the support when measuring the peripheral contour and onto the pre-grinding wheel or the Finished grinding wheel or the spaces in between.

Um Schleifspuren auf den Ringen bzw. Ringsegmenten und/oder dem umfangskonturgeschliffenen Brillenglas und eine daraus folgende Verfälschung der Meßergebnisse zu vermeiden, kann die Anlage des Brillenglases an den Ringen bzw. Ringsegmenten durch einen Antrieb bewirkt werden, der eine einstellbare Kupplung aufweist, deren Kupplungsmoment sich im Sinne einer Verminderung beim Aufnehmen der Ist-Werte der Umfangskontur mittels einer Umschaltvorrichtung verändern läßt.In order to avoid grinding marks on the rings or ring segments and / or the circumferentially contoured spectacle lens and a consequent falsification of the measurement results, the contact between the spectacle lens and the rings or ring segments can be brought about by a drive which has an adjustable clutch, the clutch torque of which changes in the sense of a reduction in the recording of the actual values, the circumferential contour can be changed by means of a switching device.

Wenn die Schleifscheibe mit ihrem Antrieb verschiebbar auf einem Kreuzschlitten relativ zur drehbar im Maschinengestell angeordneten Glashaltewelle angeordnet sind, läßt sich der Meßwertaufnehmer so anordnen, daß er die Verschiebung des Kreuzschlittens im Maschinengestell relativ zur Umfangskontur des umfangskonturgeschliffenen Brillenglases mißt. Da der Kreuzschlitten im Maschinengestell außerhalb einer die Kühlflüssigkeit und den Schleifabrieb auffangenden Wanne angeordnet ist, wird der Meßwertaufnehmer auch nicht durch die im Bereich der Schleifscheiben und des zu schleifenden Brillenglases herrschende Atmosphäre negativ beeinflußt.If the grinding wheel with its drive is arranged displaceably on a cross slide relative to the glass holding shaft rotatably arranged in the machine frame, the Arrange the transducer so that it measures the displacement of the cross slide in the machine frame relative to the circumferential contour of the contour-contoured spectacle lens. Since the cross slide is arranged in the machine frame outside a trough that collects the coolant and the grinding abrasion, the measuring sensor is also not negatively influenced by the atmosphere prevailing in the area of the grinding wheels and the spectacle lens to be ground.

Analog läßt sich der Meßwertaufnehmer bezüglich der Glashaltewelle anordnen, wenn diese am Maschinengestell relativ zur sich nur drehenden Schleifscheiben axial und radial beweglich gelagert ist, um die Ist-Werte der Umfangskontur zu messen.Analogously, the sensor can be arranged with respect to the glass holding shaft if it is axially and radially movable on the machine frame relative to the rotating grinding wheels in order to measure the actual values of the peripheral contour.

Vorzugsweise kann ein Digital-Meßwertaufnehmer eingesetzt werden, dessen Meßwerte direkt zum Rechner geleitet und dort verarbeitet werden.Preferably, a digital sensor can be used, the measured values of which are sent directly to the computer and processed there.

Das erfindungsgemäße Verfahren zum Bearbeiten der Ränder von Brillengläsern mittels der vorstehend beschriebenen Brillenglasrandschleifmaschine kann vorzugsweise darin bestehen, daß der Radius eines vorbestimmbaren, zugehörigen Winkels wenigstens eines Umfangspunktes der Umfangskontur eines formgeschliffenen Brillenglases mit Bezug auf ein Auflager gemessen, der Meßwert in einen Rechner eingegeben, mit einem gespeicherten Soll-Wert verglichen und bei Überschreiten einer dem Rechner eingebbaren, zulässigen Abweichung des Ist-Wertes von den Soll-Werten ein zusätzlicher Schleifvorgang der Umfangskontur mit einer Korrektur entsprechend der Abweichung durchgeführt wird.The method according to the invention for machining the edges of spectacle lenses by means of the above-described spectacle lens edge grinding machine can preferably consist in that the radius of a predeterminable, associated angle of at least one circumferential point of the circumferential contour of a shape-ground spectacle lens is measured with reference to a support, the measured value entered into a computer with compared to a stored target value and, if a permissible deviation of the actual value from the target values which can be entered into the computer is exceeded, an additional grinding process of the peripheral contour is carried out with a correction corresponding to the deviation.

Vorzugsweise kann der Radius wenigstens eines Umfangspunktes einer Dachfacette des umfangskonturgeschliffenen Brillenglases mit Bezug auf eine Keilnut in dem Auflager gemessen werden, wodurch erkennbar wird, ob der Winkel der Dachfacette noch im Bereich eines zulässigen Wertes liegt. In diesem Fall kann durch einen zusätzlich Schleifvorgang der Umfangskontur mit einer Korrektur entsprechend der Abweichung ein noch brauchbares Brillenglas geschaffen werden.The radius of at least one circumferential point of a roof facet of the contour-contoured spectacle lens can preferably be measured with reference to a keyway in the support, as a result of which it can be seen whether the angle of the roof facet is still in the range of a permissible value. In In this case, an additional grinding process can be used to create a still usable spectacle lens with a correction corresponding to the deviation.

Ist der Winkel der Dachfacette des umfangskonturgeschliffenen Brillenglases größer als der Winkel der Keilnut, bedeutet dies, daß die zum Schleifen der Dachfacette benutzte Schleifscheibe abgerichtet werden muß bzw. unbrauchbar geworden ist. Dies wird von der Maschine durch ein entsprechendes Signal angezeigt.If the angle of the roof facet of the contour-contoured spectacle lens is greater than the angle of the keyway, this means that the grinding wheel used to grind the roof facet must be dressed or has become unusable. This is indicated by the machine with a corresponding signal.

Wird der Radius wenigstens eines Umfangspunktes der Dachfacette des umfangskonturgeschliffenen Brillenglases sowohl mit Bezug auf die Keilnut in dem Auflager als auch mit Bezug auf einen flachen Bereich des Auflagers gemessen, läßt sich durch Vergleich dieser Meßwerte auf einfache Weise feststellen, ob eine Korrektur der mit Bezug auf die Keilnut gemessenen Abweichung des Ist-Wertes vom Soll-Wert noch möglich ist bzw. ob das Brillenglas mit einer neuen oder abgerichteten Schleifscheibe nachgeschliffen werden muß.If the radius of at least one circumferential point of the roof facet of the contour-contoured spectacle lens is measured both with reference to the keyway in the support and with reference to a flat area of the support, it can be determined in a simple manner by comparing these measured values whether a correction of the with reference to the keyway measured deviation of the actual value from the target value is still possible or whether the spectacle lens must be reground with a new or dressed grinding wheel.

Wird nur ein Umfangspunkt gemessen, erfolgt die Korrektur der gesamten Umfangskontur entsprechend der an diesem Punkt gemessenen Abweichung. Ergibt sich diese Abweichung nur aus einer Abnutzung der Vorschleifscheibe oder der Fertigschleifscheibe, die in der Regel gleichmäßig auf dem Umfang erfolgt, läßt sich mit dieser Korrektur bereits ein ausreichend genau umfangskonturgeschliffenes Brillenglas herstellen, das maßgenau genug ist, um direkt in ein bestimmtes Brillengestell eingesetzt zu werden.If only one circumferential point is measured, the entire circumferential contour is corrected according to the deviation measured at this point. If this deviation only results from wear of the pre-grinding wheel or the finishing grinding wheel, which is usually evenly distributed over the circumference, this correction can already be used to produce a sufficiently precisely contoured lens that is dimensionally accurate enough to be used directly in a specific eyeglass frame become.

Da die Abweichungen indessen auf der Umfangskontur unterschiedlich groß sein können, wobei diese Abweichungen durch die Form des Brillenglases und die Raumkurve der Umfangskontur bestimmt sind, läßt sich eine größere Genauigkeit des Korrekturschliffs erreichen, wenn die gesamte Umfangskontur vermessen, mit den gespeicherten Soll-Werten verglichen, bei Überschreiten der dem Rechner eingebbaren zulässigen Abweichung der Ist-Werte von den Soll-Werten durch den Rechner eine Mittelung der gemessenen Abweichungen durchgeführt und der zusätzliche Schleifvorgang der Umfangskontur entsprechend den gemittelten Werten durchgeführt wird.However, since the deviations on the circumferential contour can be of different sizes, these deviations being determined by the shape of the spectacle lens and the space curve of the circumferential contour, greater accuracy of the correction grinding can be achieved if the entire circumferential contour is measured with the stored target values compared, if the permissible deviation of the actual values from the target values which can be input to the computer is exceeded, the computer averages the measured deviations and the additional grinding process of the peripheral contour is carried out in accordance with the averaged values.

In allen Fällen wird ein Korrekturschliff durchgeführt, um den Ist-Wert der Umfangswerte bei 0 : 0,3 mm gegenüber dem Soll-Werten zu halten.In all cases, a correction grinding is carried out in order to keep the actual value of the circumferential values at 0: 0.3 mm compared to the target values.

Eine noch genauere Korrektur der Umfangskontur läßt sich erreichen, wenn die gesamte Umfangskontur vermessen, mit den gespeicherten Soll-Werten verglichen und bei bereichsweise Überschreiten der dem Rechner eingebbaren zulässigen Abweichung der Ist-Werte von den Soll-Werten der zusätzliche Schleifvorgang nur in den eine unzulässige Abweichung aufweisenden Bereichen der Umfangskontur durchgeführt wird.An even more precise correction of the circumferential contour can be achieved if the entire circumferential contour is measured, compared with the stored target values and, if the permissible deviation of the actual values from the target values that can be entered into the computer is exceeded in some areas, the additional grinding process is only inadmissible Deviating areas of the peripheral contour is carried out.

Um beim Vermessen der gesamten Umfangskontur eines formgeschliffenen Brillenglases nicht zu viel Zeit zu verlieren, kann dieses Vermessen bei einer gegenüber dem Schleifvorgang erhöhten Drehzahl der Brillenglashaltewelle durchgeführt werden.In order not to lose too much time when measuring the entire circumferential contour of a shape-ground spectacle lens, this measurement can be carried out at an increased rotational speed of the spectacle lens holding shaft compared to the grinding process.

Die erfindungsgemäße Korrektur des Umfangskonturschliffs eines Brillenglases läßt sich mit Brillenglasrandschleifmaschinen durchführen, bei denen die Brillenglaskontur durch eine Schablone vorgegeben wird. Diese Schablone wird auf der Brillenglashaltewelle befestigt und ruht auf einem verstellbaren Gegenlager, das sich durch den Rechner erfindungsgemäß für einen Korrekturschliff in der beschriebenen Weise verstellen läßt. Bei einer solchen Brillenglasrandschleifmaschine dient der Rechner nur dazu, die relative axiale Verschiebung der Schleifscheibe und des umfangskonturgeschliffenen Brillenglases beim Anschleifen einer Facette, das Vermessen der Umfangskontur und den ggf. erforderlichen Korrekturschliff zu steuern.The correction according to the invention of the peripheral contour grinding of an eyeglass lens can be carried out with eyeglass lens edge grinding machines in which the eyeglass lens contour is predetermined by a template. This template is fastened to the spectacle lens holding shaft and rests on an adjustable counter bearing, which can be adjusted by the computer according to the invention for a correction grinding in the manner described. In such an eyeglass lens edge grinding machine, the computer only serves to determine the relative axial displacement of the grinding wheel and the peripheral contour-ground lens when grinding a facet, the measurement of the peripheral contour and the possibly to control required correction grinding.

Es ist auch möglich, dem Rechner die Umfangskontur eines zu schleifenden Brillenglases in Form einer Datenmenge einzugeben. In diesem Fall läßt sich die der Brillenglaskontur entsprechende Schablone durch eine Kreisscheibe ersetzen und dem Widerlager wird eine Bewegung durch den Rechner erteilt, die die zu schleifende Brillenglaskontur ergibt.It is also possible to enter the peripheral contour of a spectacle lens to be ground in the form of a quantity of data. In this case, the template corresponding to the lens contour can be replaced by a circular disk and the abutment is given a movement by the computer, which results in the lens contour to be ground.

Schließlich ist es auch noch möglich, den relativen Abstand zwischen der Brillenglashaltewelle und den Schleifscheiben direkt durch den Rechner zu steuern, indem z. B. der Kreuzschlitten, der die Schleifscheiben trägt, einen entsprechenden Antrieb erhält. Auch in diesem Fall läßt sich die erfindungsgemäße Korrektur des Umfangskonturschliffs in der angegebenen Weise durchführen.Finally, it is also possible to control the relative distance between the lens holding shaft and the grinding wheels directly by the computer, for example by B. the cross slide, which carries the grinding wheels, receives a corresponding drive. In this case too, the correction of the peripheral contour grinding according to the invention can be carried out in the manner indicated.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels des näheren erläutert. In der Zeichnung zeigen:

Fig. 1
eine schematische Schnittansicht einer Brillenglasrandschleifmaschine mit Darstellung des erfindungsgemäßen Auflagers und Meßwertaufnehmers,
Fig. 2
eine perspektivische Darstellung eines zwei Schleifscheiben umgebenden Spritzschutzes mit als Ringsegment ausgebildetem Auflager und davor angeordneter Brillenglashaltewelle mit einem umfangskonturgeschliffenen Brillenglas,
Fig. 3
eine ausschnittweise Darstellung des Messens wenigstens eines Radius des umfangskonturgeschliffenen Brillenglases mit einer mittels einer neuen Schleifscheibe geschliffenen Dachfacette,
Fig. 4
eine Darstellung ähnlich Fig. 3, bei der die Dachfacette mittels einer bereits bis zur zulässigen Grenze abgenutzten Schleifscheibe geschliffen wurde,
Fig. 5
eine Darstellung gemäß Fig. 3, bei der die mittels einer sehr stark abgenutzten Schleifscheibe hergestellte Dachfacette bereits so flach geworden ist, daß sich das Brillenglas nicht mehr in ein Brillengestell einsetzen läßt,
Fig. 6
eine Darstellung der Messung des Radius eines umfangskonturgeschliffenen Brillenglases, bei der die Spitze der Dachfacette auf einen flachen Bereich des Tastkopfes aufgesetzt ist und
Fig. 7
eine vergrößerte Darstellung einer Facettennut in einer Schleifscheibe im neuen und in verschieden abgenutzten Zuständen.
The invention is explained below with reference to an embodiment shown in the drawing. The drawing shows:
Fig. 1
2 shows a schematic sectional view of an eyeglass lens edge grinding machine with a representation of the support and transducer according to the invention,
Fig. 2
1 shows a perspective view of a splash guard surrounding two grinding wheels with a support designed as a ring segment and an eyeglass lens holding shaft arranged in front of it with an eyeglass lens ground to a contour.
Fig. 3
a partial representation of the measurement of at least one radius of the contour-contoured spectacle lens with a roof facet ground using a new grinding wheel,
Fig. 4
3, in which the roof facet was ground by means of a grinding wheel that had already worn to the permissible limit,
Fig. 5
3, in which the roof facet made by means of a very worn grinding wheel has already become so flat that the spectacle lens can no longer be inserted into a spectacle frame,
Fig. 6
a representation of the measurement of the radius of a contour-ground spectacle lens, in which the tip of the roof facet is placed on a flat area of the probe and
Fig. 7
an enlarged view of a facet groove in a grinding wheel in new and differently used conditions.

An einem Maschinengestell 1 ist ein Kreuzschlitten 2 angeordnet, dessen Schlittenteil 3 Führungsstangen 4 aufweist, die in Bohrungen 5 von Ansätzen 6 eines Schlittenteils 7 radial zu einer Brillenglashaltewelle 14 mit einem davon gehaltenen Brillenglas 24 verschiebbar gelagert sind.A cross slide 2 is arranged on a machine frame 1, the slide part 3 of which has guide rods 4, which are mounted in bores 5 of projections 6 of a slide part 7 so as to be displaceable radially to an eyeglass lens holding shaft 14 with an eyeglass lens 24 held thereby.

Der Schlittenteil 7 ist über Führungsschienen 8 am Maschinengestell 1 in einer Richtung parallel zur Brillenglashaltewelle 14 und einer Welle 10 für eine Vorschleifscheibe 11 und eine dazu koaxial angeordnete Fertig- und/oder Facettenschleifscheibe 12 mit einer Facettennut 33 angeordnet.The slide part 7 is via guide rails 8 on the machine frame 1 in a direction parallel to the spectacle lens holding shaft 14 and a shaft 10 for a pre-grinding wheel 11 and one coaxially arranged therewith Finished and / or facet grinding wheel 12 arranged with a facet groove 33.

Die Welle 10 ist mittels Lagerstützen 9 am Schlittenteil 3 gelagert. Die Schleifscheiben 11, 12 und das Brillenglas 24 mit ihren Wellen 10, 14 sind von einem Gehäuse 13 umgeben, das unten eine im einzelnen nicht dargestellte Wanne aufweist, die verhindert, daß Kühlflüssigkeit und Schleifabrieb in den Bereich des Kreuzschlittens 2 gelangt.The shaft 10 is supported on the slide part 3 by means of bearing supports 9. The grinding wheels 11, 12 and the spectacle lens 24 with their shafts 10, 14 are surrounded by a housing 13 which has a trough, not shown in detail below, which prevents coolant and grinding abrasion from reaching the cross slide 2.

Mit der Brillenglashaltewelle 14 ist ein Winkelgeber 15 verbunden, der mit einem Rechner 16 in Verbindung steht.An angle encoder 15 is connected to the spectacle lens holding shaft 14 and is connected to a computer 16.

Ein Meßwertaufnehmer 17 ist am Schlittenteil 7 angeordnet und nimmt die Radialverschiebung des Schlittenteils 3 bezüglich der Brillenglashaltewelle 14 auf. Dieser Meßwertaufnehmer 17 ist ebenfalls mit dem Rechner 16 verbunden.A transducer 17 is arranged on the slide part 7 and absorbs the radial displacement of the slide part 3 with respect to the spectacle lens holding shaft 14. This transducer 17 is also connected to the computer 16.

Die Radialverschiebung des Schlittenteils 3 wird durch einen vom Rechner 16 über Steuerungsverbindungen 21 angesteuerten Antriebsmotor 18 bewirkt, der mit den Führungsstangen 4 über eine elektromagnetische Kupplung 19 in Antriebsverbindung steht.The radial displacement of the slide part 3 is brought about by a drive motor 18 which is controlled by the computer 16 via control connections 21 and which is in drive connection with the guide rods 4 via an electromagnetic clutch 19.

In einem Soll-Wert-Speicher 20 sind Umfangskonturwerte für die verschiedensten Brillenglasformen als Polarkoordinaten gespeichert.In a target value memory 20, peripheral contour values for a wide variety of spectacle lens shapes are stored as polar coordinates.

Zum Schleifen einer vorgebbaren Brillenglasumfangskontur wird ein Brillenglasrohling in die Brillenglashaltewelle 14 eingespannt und mit der Vorschleifscheibe 11 in Berührung gebracht. Der dabei auftretende Anpreßdruck ergibt sich aus der Einstellung der elektromagnetischen Kupplung 19 und ist unterschiedlich einstellbar für Brillengläser aus Kunststoff oder Silikatglas sowie entsprechend der von den optischen Werten des Brillenglases abhängigen Randdicke des Brillenglases.To grind a predeterminable lens peripheral contour, a lens blank is clamped into the lens holder shaft 14 and brought into contact with the pre-grinding disk 11. The contact pressure which arises in this case results from the setting of the electromagnetic clutch 19 and can be set differently for spectacle lenses made of plastic or silicate glass and in accordance with the edge thickness of the spectacle lens depending on the optical values of the spectacle lens.

Das Brillenglas 24 wird mit seiner Welle 14 in bekannter Weise in Drehung versetzt, wobei die Drehgeschwindigkeit üblicherweise bei 10 bis 13 U/min beträgt. Der Winkelgeber 15 übermittelt dem Rechner 16 in gleichen Winkelabständen, z. B. in Inkrementen von je 6° einen Impuls, wodurch der Rechner 16 veranlaßt wird, den dazugehörigen, zu schleifenden Radius des Brillenglases über den Antriebsmotor 18 einzustellen. Während des Schleifens der Umfangskontur des Brillenglases 24 auf der Vorschleifscheibe 11 werden der Schlittenteil 7 und damit die Schleifscheibe 11 in eine oszillierende Bewegung parallel zur Drehachse des Brillenglases 24 versetzt, die jeweils am Rand der Vorschleifscheibe 11 in die entgegengesetzte Richtung umgesteuert wird. Diese Bewegung wird durch einen nicht dargestellten Antrieb für den Schlittenteil 7 gesteuert, der ebenfalls mit dem Rechner 16 in Verbindung steht. Beiderseits der Vorschleifscheibe 11 sind Ringsegmente 23 angeordnet, die an einem die Vorschleifscheibe 11 und die Fertigschleifscheibe 12 eng umgreifenden Spritzschutz 22, der nur im Berührungsbereich mit dem Brillenglas 24 offen ist, befestigt sind. Die Ringsegmente 23 dienen als Taster und sind mit einem schematisch in Fig. 2 dargestellten Sensor 26 verbunden, der seinerseits über eine Steuerleitungsverbindung 27 mit dem Rechner 16 verbunden ist. Die oszillierenden Bewegungen des Schlittenteils 7 und damit der Schleifscheiben 11, 12 und des sie umgebenden Spitzschutzes 22 werden in der in der deutschen Patentschrift 38 42 601 beschriebenen Weise durch den Sensor 26 gesteuert und dienen gleichzeitig dazu, das umfangskonturgeschliffene Brillenglas 24 hinsichtlich der Raumkurve der Vorder- und Rückseite und der Glasdicke zu vermessen. Diese Meßwerte dienen dazu, mittels der Facettennut 33 in der Fertigschleifscheibe 12 eine Facette an das umfangskonturgeschliffene Brillenglas anzuschleifen, deren Verlauf mittels des Rechners 16 steuerbar ist.The spectacle lens 24 is rotated with its shaft 14 in a known manner, the speed of rotation usually being at 10 to 13 rpm. The angle encoder 15 transmits the computer 16 at equal angular intervals, for. B. in increments of 6 °, a pulse, which causes the computer 16 to set the associated radius of the spectacle lens to be ground via the drive motor 18. During the grinding of the peripheral contour of the spectacle lens 24 on the pre-grinding wheel 11, the slide part 7 and thus the grinding wheel 11 are set into an oscillating movement parallel to the axis of rotation of the spectacle lens 24, which is reversed in the opposite direction at the edge of the pre-grinding wheel 11. This movement is controlled by a drive, not shown, for the slide part 7, which is also connected to the computer 16. On both sides of the pre-grinding wheel 11, ring segments 23 are arranged, which are fastened to a splash guard 22 which closely surrounds the pre-grinding wheel 11 and the finished grinding wheel 12 and which is only open in the area of contact with the spectacle lens 24. The ring segments 23 serve as buttons and are connected to a sensor 26, shown schematically in FIG. 2, which in turn is connected to the computer 16 via a control line connection 27. The oscillating movements of the slide part 7 and thus the grinding wheels 11, 12 and the surrounding protection 22 are controlled in the manner described in the German patent 38 42 601 by the sensor 26 and at the same time serve the circumferentially contoured spectacle lens 24 with respect to the spatial curve of the front - and back and the glass thickness to be measured. These measured values are used to grind a facet to the peripheral contour-ground spectacle lens by means of the facet groove 33 in the finish grinding wheel 12, the course of which can be controlled by means of the computer 16.

Nachdem mittels der Vorschleifscheibe 11 die Brillenglasumfangskontur entsprechend der Darstellung in Fig. 1 geschliffen wurde, wird das Brillenglas 24 automatisch auf die Fertigschleifscheibe 12 umgesetzt und lagegenau bezüglich der Facettennut 33 positioniert. Das Brillenglas 24 weist für den Fertigschliff eine ausreichende Bearbeitungszugabe auf.After using the pre-grinding wheel 11, the contour of the spectacle lens as shown in FIG. 1 has been ground, the spectacle lens 24 is automatically moved onto the finish grinding wheel 12 and positioned in relation to the facet groove 33. The spectacle lens 24 has sufficient machining allowance for the final grinding.

Nach dem Fertigschliff wird das Brillenglas 24, gesteuert durch den Rechner 16, lagegenau auf einen der Ringsegmente 23 aufgesetzt. Das Ringsegment 23 dient als Auflager zum Messen des Abstandes zwischen der Brillenglashaltewelle 14 und diesem Ringsegment 23. Welcher Punkt des Brillenglases 24 auf das Ringsegment 23 aufgesetzt wird, bestimmt der Rechner 16 anhand eingegebener Befehle. Im einfachsten Fall genügt es, eine einzige Abstandsmessung vorzunehmen, für diesen Runkt die Abweichung des Ist-Werts zu dem entsprechenden Soll-Wert, der im Soll-Wert-Speicher 20 gespeichert ist, festzustellen und durch den Rechner 16 bei Überschreiten einer vorgebbaren Abweichung einen erneuten Feinschliff mit Korrektur dieser Abweichung durchzuführen. Dieses Verfahren mit Erfassen nur eines Meßpunktes setzt voraus, daS die Abweichungen auf der gesamten Umfangskontur überall im wesentlichen gleich sind.After the final grinding, the spectacle lens 24, controlled by the computer 16, is placed in an exact position on one of the ring segments 23. The ring segment 23 serves as a support for measuring the distance between the spectacle lens holding shaft 14 and this ring segment 23. Which point of the spectacle lens 24 is placed on the ring segment 23 is determined by the computer 16 on the basis of input commands. In the simplest case, it is sufficient to carry out a single distance measurement, determine the deviation of the actual value for this point from the corresponding target value, which is stored in the target value memory 20, and one by the computer 16 when a predeterminable deviation is exceeded carry out another fine adjustment with correction of this deviation. This method with detection of only one measuring point presupposes that the deviations on the entire circumferential contour are essentially the same everywhere.

Genauer ist eine Messung, wenn die gesamte Brillenglaskontur 25 über eine vollständige Umdrehung des Brillenglases 24 mit Anlage am Ringsegment 23 durchgeführt wird. Da die Ringsegmente 23 sehr schmal sind, um die Axialerstreckung der Schleifscheiben 11, 12 im Spritzschutz 22 möglichst gering zu halten, erteilt der Rechner 16 dem Schlittenteil 7 eine Bewegung parallel zur Achse der Welle 14, die die Raumkurve der Brillenglaskontur bzw. der Facette berücksichtigt, so daß das Brillenglas 24 während dieser einen Umdrehung zum Vermessen der Umfangskontur auf dem Ringsegment 23 verbleibt. Die Abstandswerte des Brillenglases 24 werden mittels des Meßwertaufnehmers 17 aufgenommen und in den Rechner 16 geleitet, wo der Vergleich mit den Soll-Werten vorgenommen wird.A measurement is more precise if the entire spectacle lens contour 25 is carried out over a complete revolution of the spectacle lens 24 with contact with the ring segment 23. Since the ring segments 23 are very narrow in order to keep the axial extent of the grinding wheels 11, 12 in the splash guard 22 as small as possible, the computer 16 gives the slide part 7 a movement parallel to the axis of the shaft 14, which takes into account the spatial curve of the lens contour or the facet , so that the spectacle lens 24 remains on the ring segment 23 during this one revolution for measuring the circumferential contour. The distance values of the spectacle lens 24 are recorded by means of the sensor 17 and fed into the computer 16, where the comparison with the target values is carried out.

Ergibt sich aus dem Vergleich der Ist-Werte mit den Soll-Werten eine unzulässige Abweichung auf der Brillenglasumfangskontur, so kann der Rechner 16 entweder diese Abweichung über den Umfang mitteln und einen Korrekturschliff entsprechend diesem Mittelwert einstellen oder die Abweichungen werden Punkt für Runkt registriert, mit den entsprechenden Soll-Werten verglichen und ein Korrekturschliff wird nur dort durchgeführt, wo tatsächlich eine Abweichung aufgetreten ist.This results from the comparison of the actual values with the If values are to be an impermissible deviation on the contour of the spectacle lens, the computer 16 can either average this deviation over the circumference and set a correction grinding according to this mean value or the deviations are registered point by point, compared with the corresponding target values and correction grinding is only carried out where a deviation actually occurred.

Wird die Messung ausschließlich so durchgeführt, daß das umfangskonturgeschliffene Brillenglas mit seiner Dachfacette auf einen flachen Bereich des Ringsegments 23 aufgesetzt wird, läßt sich auch nur eine Veränderung im Durchmesser der Schleifscheibe 23 ermitteln und ggf. korrigieren.If the measurement is carried out only in such a way that the peripheral contour-ground spectacle lens with its roof facet is placed on a flat area of the ring segment 23, only a change in the diameter of the grinding wheel 23 can be determined and corrected if necessary.

In Fig. 3 bis 7 ist dargestellt, daß die Abnutzung der Facettennut 33 einer Schleifscheibe 12 nicht nur eine Durchmesserveränderung, sondern auch eine Winkelveränderung der Dachfacette bewirkt.3 to 7 show that the wear of the facet groove 33 of a grinding wheel 12 causes not only a change in diameter but also an angle in the roof facet.

In Fig. 7 ist eine Fertigschleifscheibe 12 mit einer Facettennut 33 in ausgezogenen Linien dargestellt, die einen Winkel φ1 aufweist, der kleiner ist als der übliche Winkel einer Facettennut in einem Brillengestell. Ein maßgenau konturgeschliffenes Brillenglas läßt sich daher problemlos in ein entsprechendes Brillengestell einsetzen und liegt mit der Spitze der Dachfacette am Facettengrund des Brillengestells an.7 shows a finished grinding wheel 12 with a facet groove 33 in solid lines, which has an angle φ 1 which is smaller than the usual angle of a facet groove in an eyeglass frame. A precisely contoured lens can therefore be easily inserted into a corresponding eyeglass frame and rests with the tip of the roof facet on the facet base of the eyeglass frame.

In Fig. 3 ist dieser Zustand mit Bezug auf eine Keilnut 28 im Ringsegment 23 dargestellt. Diese Keilnut 28 ist mit einem Winkel φo versehen, der größer als der Winkel φ1 der Facettennut 33 in der Fertigschleifscheibe 12 und etwa gleich dem Winkel der Facettennut in den üblichen Brillengestellen ist.This state is shown in FIG. 3 with reference to a keyway 28 in the ring segment 23. This keyway 28 is provided with an angle φ o , which is greater than the angle φ 1 of the facet groove 33 in the finish grinding wheel 12 and approximately equal to the angle of the facet groove in the usual eyeglass frames.

Wird ein umfangskonturgeschliffenes Brillenglas 24 mit seiner Dachfacette 30 in die Keilnut 28 des Ringsegments 23 eingesetzt, läßt sich für dien Runkt der Radius R1 messen. Weicht dieser gemessene Radius R1 von einem vorgegebenen Soll-Wert ab und ist zu groß, wird das Brillenglas 24 automatisch zur Fertigschleifscheibe 12 zurückgeführt, und es wird ein Korrekturschliff durchgeführt. Im Laufe der Zeit nutzt sich die Facettennut in der Fertigschleifscheibe 12 ab und nimmt zunächst eine in Fig. 7 mit der Bezugsziffer 34 bezeichnete und schräg schraffierte Form an. Der Winkel dieser Facettennut einer abgenutzten Fertigschleifscheibe 12 ist mit φ2 bezeichnet. Es ist erkennbar, daß gleichzeitig die Tiefe der Facettennut 34 um den Betrag Δ1 zugenommen hat. Wird ein konturgeschliffenes Brillenglas 24 mit einer Dachfacette, die den Winkel φ2 aufweist, entsprechend Fig. 4 in die Keilnut 28 des Ringsegments 23 eingeführt, ergibt sich ein gemessener Radius R2, der um den Wert Δ1 > R1 ist. Auch in diesem Fall läßt sich noch ein Korrekturschliff durchführen, der das konturgeschliffene Brillenglas 24 um den Wert Δ1 verkleinert.If a circumferentially contoured lens 24 with its Roof facet 30 inserted into the keyway 28 of the ring segment 23, the radius R 1 can be measured for the point. If this measured radius R 1 deviates from a predetermined target value and is too large, the spectacle lens 24 is automatically returned to the finish grinding wheel 12 and a corrective grinding is carried out. In the course of time, the facet groove in the finished grinding wheel 12 wears out and initially assumes a shape which is denoted by the reference number 34 in FIG. 7 and is hatched. The angle of this facet groove of a worn finished grinding wheel 12 is denoted by φ 2 . It can be seen that at the same time the depth of the facet groove 34 has increased by the amount Δ 1 . If a contour-ground spectacle lens 24 with a roof facet, which has the angle φ 2 , is inserted into the keyway 28 of the ring segment 23 according to FIG. 4, a measured radius R 2 results, which is around the value Δ 1 > R 1 . In this case too, a correction grinding can be carried out, which reduces the contour-ground spectacle lens 24 by the value Δ 1 .

Ist die Fertigschleifscheibe 12 so weit abgenutzt, daß eine Facettennut 35 mit einem Winkel φ3 erreicht ist, zu der eine Vergrößerung der Tiefe von Δ2 gehört, läßt sich diese abgeflachte Dachfacette mit dem Winkel φ3 nicht mehr vollständig in die Keilnut 28 am Ringsegment 23 einführen, sondern liegt mit ihren Flanken, wie in Fig. 5 dargestellt, an den äußeren Kanten der Keilnut 28 an. In diesem Fall wird ein Radius R3 gemessen, der bezüglich R1 nicht nur um den Betrag Δ2 vergrößert ist, sondern um einem demgegenüber größeren Betrag, der eine Funktion dieses Winkels φ3 ist. Der Rechner 16 läßt sich nun so programmieren, daß er die Grenze zwischen dem Radius R2 und dem Radius R3 erkennt und ein Signal abgibt, das dem Betreiber anzeigt, daß die Fertigschleifscheibe 12 so weit abgenutzt ist, daß sich ein Konturschliff nicht mehr durchführen läßt.If the finish grinding wheel 12 is worn so far that a facet groove 35 with an angle φ 3 is reached, which includes an increase in the depth of Δ 2 , this flattened roof facet with the angle φ 3 can no longer be completely inserted into the keyway 28 on the ring segment 23, but lies with its flanks, as shown in Fig. 5, on the outer edges of the keyway 28. In this case, a radius R 3 is measured, which is increased with respect to R 1 not only by the amount Δ 2 , but also by a larger amount, which is a function of this angle φ 3 . The computer 16 can now be programmed so that it recognizes the boundary between the radius R 2 and the radius R 3 and emits a signal which indicates to the operator that the finish grinding wheel 12 is worn so far that contour grinding can no longer be carried out leaves.

Sehr einfach läßt sich dieser Grenzwert bestimmen, wenn, wie in Fig. 6 dargestellt, nach der Messung der Radien R1, R2 bzw. R3 mit Bezug auf die Keilnut 28 ein weiterer Radius R4 gemessen wird, indem das umfangskonturgeschliffene Brillenglas 24 mit seiner Dachfacette 30, 31, 32 auf einen flachen Bereich 29 des Ringsegments 23 aufgesetzt wird. Aus der Differenz der Radien R1, R2 bzw. R3 zu dem Radius R4 ergibt sich direkt ein Wert, der größer als Null wird, wenn φ3 größer als φo wird. Dies ist für den Rechner ein Meßwert, der ihn veranlaßt, das bereits erwähnte Signal abzugeben, daß ein Korrekturschliff nicht mehr möglich ist und daß die Fertigschleifscheibe ausgewechselt oder abgerichtet werden muß.This limit value can be determined very easily if, how 6, after the measurement of the radii R 1 , R 2 or R 3 with respect to the keyway 28, a further radius R 4 is measured by the peripheral contour-ground spectacle lens 24 with its roof facet 30, 31, 32 on a flat surface Area 29 of the ring segment 23 is placed. The difference between the radii R 1 , R 2 or R 3 and the radius R 4 directly results in a value which becomes greater than zero when φ 3 becomes greater than φ o . This is a measured value for the computer, which causes it to emit the signal already mentioned that corrective grinding is no longer possible and that the finish grinding wheel must be replaced or dressed.

Die Vergleichsmessung braucht nur bezüglich eines Radius des konturgeschliffenen Brillenglases 24 durchgeführt zu werden, während für einen genauen Korrekturschliff ein Vermessen des gesamten Umfanges des Brillenglases 24 in der Keilnut 28 oder auf dem abgeflachten Bereich 29 des Ringsegments 23 erfolgen kann.The comparison measurement only needs to be carried out with respect to a radius of the contour-ground spectacle lens 24, while for an exact correction grinding the entire circumference of the spectacle lens 24 can be measured in the keyway 28 or on the flattened region 29 of the ring segment 23.

Die erfindungsgemäße Vorrichtung und das Verfahren sind geeignet, mit vollautomatischen, CNC-gesteuerten Brillenglasrandschleifmaschinen eingesetzt zu werden. Bei diesen Brillenglasrandschleifmaschinen dienen die gespeicherten Soll-Werte der Umfangskontur dazu, den die Schleifscheiben 11 und 12 tragenden Kreuzschlitten so anzusteuern, daß direkt die geforderte Brillenglasumfangskontur entsteht.The device and the method according to the invention are suitable for use with fully automatic, CNC-controlled spectacle lens edge grinding machines. In these spectacle lens edge grinding machines, the stored nominal values of the peripheral contour serve to control the cross slide carrying the grinding wheels 11 and 12 in such a way that the required spectacle lens circumferential contour is created directly.

Das erfindungsgemäße Verfahren und die Vorrichtung sind auch geeignet, mit Brillenglasrandschleifmaschinen verwendet zu werden, bei denen der Rechner 16 nur dazu dient, die Ist-Werte des formgeschliffenen Brillenglases 24 mit den gespeicherten Soll-Werten der Umfangskontur zu vergleichen und einen Korrekturschliff durchzuführen, während der eigentliche Formschliff des Brillenglases durch eine auf der Brillenglashaltewelle 14 angeordnete Formscheibe mit der Form des zu schleifende Brillenglases gesteuert wird. Die Formscheibe liegt in diesem Fall in bekannter Weise an einem Widerlager an, das mit dem Schlittenteil 3 verbunden ist und die Verschiebung der Schleifscheiben 11, 12 und des Schlittenteils 3 bewirkt. Zum Durchführen eines Korrekturschliffs wird das Widerlager durch den Rechner 16 entsprechend der festgestellten Abweichung verstellt.The method and the device according to the invention are also suitable for use with spectacle lens edge grinding machines, in which the computer 16 only serves to compare the actual values of the shaped spectacle lens 24 with the stored nominal values of the peripheral contour and to carry out a correction grinding during the actual shape grinding of the spectacle lens by means of a shaping disc with the shape arranged on the spectacle lens holding shaft 14 of the spectacle lens to be ground is controlled. In this case, the shaped wheel rests in a known manner on an abutment which is connected to the slide part 3 and causes the grinding wheels 11, 12 and the slide part 3 to be displaced. In order to carry out a correction grinding, the abutment is adjusted by the computer 16 in accordance with the deviation found.

Schließlich kann das Widerlager auch dazu dienen, rechnergesteuert die Verlagerung des Schlittenteils 3 und somit der Schleifscheiben 11, 12 zu veranlassen, wenn an dem Widerlager statt einer Formscheibe mit der Umfangskontur des zu schleifenden Brillenglases eine kreisrunde Scheibe anliegt.Finally, the abutment can also be used, under computer control, to cause the slide part 3 and thus the grinding wheels 11, 12 to be displaced if a circular disk rests on the abutment instead of a shaped disk with the peripheral contour of the spectacle lens to be ground.

In allen Fällen läßt sich das Vermessen des umfangskonturgeschliffenen Brillenglases 24 auf einem sehr schmalen Auflager in Form des Ringsegments 23 durchführen, wenn das Brillenglas 24 an der Brillenglashaltewelle 14 in Achsrichtung entsprechend seiner Raumkurve verschoben wird. Diese Verschiebung in Achsrichtung kann auch rein mechanisch, z. B. mittels Panhard-Stabes erfolgen.In all cases, the measurement of the contour-contoured spectacle lens 24 can be carried out on a very narrow support in the form of the ring segment 23 if the spectacle lens 24 on the spectacle lens holding shaft 14 is displaced in the axial direction in accordance with its spatial curve. This shift in the axial direction can also be purely mechanical, for. B. done by Panhard rod.

Selbstverständlich kann ein Vermessen der Umfangskontur des Brillenglases 24 bereits nach dem Vorschliff auf der Vorschleifscheibe 11 erfolgen. Dies ist vorteilhaft, da sich die Vorschleifscheibe 11 schneller abnutzt als die Feinschleifscheibe 13. Ggf. kann dann auf ein erneutes Vermessen der Umfangskontur nach dem Fertigschliff ganz verzichtet werden. Jedoch können auch nach dem Fertigschliff wiederum ein Vermessen der Umfangskontur und ggf. ein Korrekturschliff erfolgen.Of course, the circumferential contour of the spectacle lens 24 can be measured after the pre-grinding on the pre-grinding disc 11. This is advantageous since the pre-grinding wheel 11 wears out faster than the fine grinding wheel 13. a renewed measurement of the circumferential contour after the final grinding can then be dispensed with entirely. However, a measurement of the circumferential contour and, if necessary, a corrective grinding can also be carried out after the final grinding.

Insbesondere beim Vermessen des Brillenglases nach dem Fertigschliff läßt sich die Drehzahl der Brillenglashaltewelle 14 erhöhen, um die Messung beschleunigt durchführen zu können. Dabei kann über den Rechner 16 ein Steuerungsbefehl an die Magnetkupplung 19 gegeben werden, der den Anpreßdruck beim Messen gegenüber dem Schleifdruck vermindert, so daß eine Abnutzung oder Riefenbildung auf dem Ringsegment 23 bzw. am Brillenglasumfang vermieden werden.In particular when measuring the spectacle lens after the final grinding, the rotational speed of the spectacle lens holding shaft 14 can be increased in order to be able to carry out the measurement more quickly. It can be via the computer 16 Control command are given to the magnetic coupling 19, which reduces the contact pressure during measurement compared to the grinding pressure, so that wear or scoring on the ring segment 23 or on the periphery of the glasses are avoided.

Selbstverständlich läßt sich die Erfindung in analoger Weise auch mit einer Brillenglasrandschleifmaschine verwenden, bei der die Schleifscheiben sich nur drehen können, sonst aber feststehen, während die Brillenglashaltewelle radial und axial beweglich bezüglich der Schleifscheiben gelagert ist.Of course, the invention can also be used in an analogous manner with a spectacle lens edge grinding machine in which the grinding wheels can only rotate, but are otherwise stationary, while the spectacle lens holding shaft is mounted so that it can move radially and axially with respect to the grinding wheels.

Claims (16)

  1. A spectacle-lens edge grinding machine, comprising
    - at least one grinding disc (11),
    - a rotatable spectacle-lens holding shaft (14) which is adjustable at least radially relative to the grinding disc (11),
    - at least one support (23) which cooperates in contact with a peripherally-ground spectacle lens (24),
    - a measured-value sensor (17) for recording at least one actual value of the peripheral contour (25) relative to the support (23),
    - a computer (16) controlling the spectacle-lens edge grinding machine for the comparison of desired values of the peripheral contour (25) of the spectacle lens (24) to be ground which are stored therein with at least one measured actual value of the peripheral contour and for controlling an additional grinding operation if a permissible deviation of the actual value or values from the desired values which can be entered into the computer (16) is exceeded.
  2. A spectacle-lens edge grinding machine according to Claim 1, characterised in that the support or supports consist(s) of narrow rings (23) or ring segments which are fixed relative to the grinding disc(s), arranged laterally to the grinding disc (11) or discs (11, 12), on to which the spectacle lens (24) is transferred after the grinding of the peripheral contour (25).
  3. A spectacle-lens edge grinding machine according to Claim 1 or 2, characterised in that the probe (23) for recording at least one radius value has a wedge groove (28) with a wedge angle equal to the maximum permissible acute angle of a roof facet (30) on the spectacle lens (24).
  4. A spectacle-lens edge grinding machine according to Claim 3, characterised in that the probe (23) has in addition to the wedge groove (28) a flat region (29) for recording at least one radius value of the point of the roof facet (30).
  5. A spectacle-lens edge grinding machine according to Claim 2, 3 or 4, characterised in that the rings (23) or ring segments are arranged on either side of a rough-grinding disc (11) and the rings (23) or ring segments form a probe for measuring the spherical curve of the spectacle lens contour (25).
  6. A spectacle-lens edge grinding machine according to one of Claims 1 to 5, characterised in that the grinding disc(s) (11, 12) are closely surrounded by a fixed spray guard (22) with the exception of the grinding region and the rings (23) or ring segments are arranged on the spray guard.
  7. A spectacle-lens edge grinding machine according to one or more of Claims 1 to 6, characterised in that the computer (16) cooperates with a device for controlling the axial position of the spectacle-lens holding shaft (14) with the spectacle lens (24) relative to the grinding disc (11, 12) corresponding to the spherical curve of the peripheral contour (25) of the spectacle lens, and this device is also active when recording the actual values of the peripheral contour (25) by means of the support (23).
  8. A spectacle-lens edge griding machine according to one or more of Claims 1 to 7, characterised by a drive means (18), which acts via an adjustable coupling (19), for the radial adjustment of the grinding disc(s) (11, 12) relative to the spectacle-lens holding shaft (14) and a switchover device which acts on the coupling (19) to reduce the transmitted torque when recording the actual values of the peripheral contour (25).
  9. A spectacle-lens edge grinding machine according to one or more of Claims 1 to 8, characterised in that the grinding disc(s) (11, 12) are arranged with their drive means displaceably on a cross-slide (2) relative to the lens holding shaft (14) arranged rotationally in the machine frame (1) and the measured-value sensor (17) measures the displacement of the cross-slide (2) in the machine frame (1) relative to the peripheral contour (25) of the form-ground spectacle lens (24).
  10. A spectacle-lens edge grinding machine according to one or more of Claims 1 to 9, characterised by a digital measured-value sensor (17).
  11. A method for machining the edges of spectacle lenses by means of a spectacle-lens edge grinding machine according to one or more of Claims 1 to 10, characterised in that the radius of a predeterminable, associated angle of at least one peripheral point of a peripherally-ground spectacle lens is measured with respect to a support, the measured value is entered into a computer, is compared with a stored desired value and if a permissible deviation in the actual value from the desired value which can be entered into the computer is exceeded an additional grinding operation for the peripheral contour is effected with a correction corresponding to the deviation.
  12. A method according to Claim 11, characterised in that the radius of at least one peripheral point of a roof facet of the peripherally-ground spectacle lens is measured with respect to a wedge groove in the support.
  13. A method according to Claim 12, characterised in that the radius of at least one peripheral point of the roof facet of the peripherally-ground spectacle lens is measured both relative to the wedge groove in the support and also relative to a flat region of the support and by comparing the measured values it is determined whether a correction of the deviation of the actual value from the desired value measured relative to the wedge groove is possible.
  14. A method according to one of Claims 11 to 13, characterised in that the entire peripheral contour is measured, compared with the stored desired values, if the permissible deviation of the actual value from the desired values which can be entered into the computer is exceeded the computer effects averaging of the measured deviations and the additional grinding operation of the peripheral contour is performed corresponding to the averaged values.
  15. A method according to one of Claims 11 to 13, characterised in that the entire peripheral contour is measured, compared with the stored desired values, and if the permissible deviation of the actual values from the desired values which can be entered into the computer is exceeded in places the additional grinding operation is effected only in those regions of the peripheral contour having an impermissible deviation.
  16. A method according to one of Claims 11 to 15, characterised in that the measurement of the peripheral contour of a peripherally-ground spectacle lens is effected at a speed of rotation of the spectacle-lens holding shaft which is higher than that of the grinding operation.
EP94920937A 1993-06-24 1994-06-15 Spectacle lens edge grinding machine Expired - Lifetime EP0706439B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4320934 1993-06-24
DE4320934A DE4320934C2 (en) 1993-06-24 1993-06-24 Spectacle lens edge grinding machine
PCT/EP1994/001945 WO1995000292A1 (en) 1993-06-24 1994-06-15 Spectacle lens edge grinding machine

Publications (2)

Publication Number Publication Date
EP0706439A1 EP0706439A1 (en) 1996-04-17
EP0706439B1 true EP0706439B1 (en) 1996-11-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94920937A Expired - Lifetime EP0706439B1 (en) 1993-06-24 1994-06-15 Spectacle lens edge grinding machine

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US (1) US5630746A (en)
EP (1) EP0706439B1 (en)
DE (2) DE4320934C2 (en)
WO (1) WO1995000292A1 (en)

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DE19804455A1 (en) * 1998-02-05 1999-08-26 Wernicke & Co Gmbh Method and device for producing a facet on the edge of a spectacle lens

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DE4320934C2 (en) * 1993-06-24 1995-04-20 Wernicke & Co Gmbh Spectacle lens edge grinding machine
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
JP4034842B2 (en) * 1996-03-26 2008-01-16 株式会社ニデック Lens grinding machine
JPH09277148A (en) * 1996-04-17 1997-10-28 Topcon Corp Method of lens peripheral edge grinding and device thereof
DE19616536C2 (en) * 1996-04-25 2000-01-27 Wernicke & Co Gmbh Process and eyeglass lens grinding machine for shaping the peripheral edge of eyeglass lenses and possibly for subsequent facet grinding
AU3042297A (en) * 1996-06-15 1998-01-07 Unova U.K. Limited Workpiece inspection and handling
FR2751256B1 (en) * 1996-07-22 1998-12-31 Briot Int OPTICAL GLASS GRINDING MACHINE
CA2268056A1 (en) * 1996-09-04 1998-03-12 Wernicke & Co. Gmbh Polishing machine for spectacle lenses
US5816897A (en) * 1996-09-16 1998-10-06 Corning Incorporated Method and apparatus for edge finishing glass
DE19643546C2 (en) * 1996-10-24 1998-08-06 Wernicke & Co Gmbh Additional wheel-driven grinding spindle for chamfering the edges of lenses on a lens processing machine
JPH10138108A (en) * 1996-10-31 1998-05-26 Nidek Co Ltd Equipment and method for grinding spectacles lens
JP4002324B2 (en) * 1997-07-08 2007-10-31 株式会社ニデック Lens grinding device
WO1999026759A1 (en) * 1997-11-20 1999-06-03 Essilor International Compagnie Generale D'optique Method for finishing spectacle lenses, and related device
FR2771665B1 (en) * 1997-12-03 2000-02-18 Briot Int METHOD AND SYSTEM FOR MONITORING THE OPERATION OF A MACHINE FOR SIZING AN OPTICAL GLASS BLANK
DE19804542C5 (en) * 1998-02-05 2009-04-30 Wernicke & Co Gmbh Method and device for processing spectacle lenses
JP3730406B2 (en) * 1998-04-30 2006-01-05 株式会社ニデック Eyeglass lens processing equipment
US6328630B1 (en) * 1998-10-05 2001-12-11 Hoya Corporation Eyeglass lens end face machining method
DE19914174A1 (en) * 1999-03-29 2000-10-12 Wernicke & Co Gmbh Method and device for shaping the peripheral edge of spectacle lenses
JP3839185B2 (en) * 1999-04-30 2006-11-01 株式会社ニデック Eyeglass lens processing equipment
US6325704B1 (en) * 1999-06-14 2001-12-04 Corning Incorporated Method for finishing edges of glass sheets
JP4360764B2 (en) * 2000-04-28 2009-11-11 株式会社トプコン Lens peripheral processing method, lens peripheral processing apparatus, and spectacle lens for spectacle lens
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US7454264B2 (en) * 2006-11-29 2008-11-18 Kurt William Schaeffer Method of beveling an ophthalmic lens blank, machine programmed therefor, and computer program
JP5194107B2 (en) * 2008-04-04 2013-05-08 Ｈｏｙａ株式会社 Specimen circumference measurement apparatus and bevel circumference measurement method of spectacle lens
JP5372628B2 (en) * 2009-07-08 2013-12-18 株式会社ニデック Eyeglass lens processing apparatus and beveling tool used in the apparatus
US8721392B2 (en) * 2011-06-28 2014-05-13 Corning Incorporated Glass edge finishing method
JP6034582B2 (en) * 2012-03-29 2016-11-30 Hoya株式会社 Eyeglass lens manufacturing method, circumference calculation device, and circumference calculation program
JP6005498B2 (en) 2012-12-12 2016-10-12 Hoya株式会社 Lens processing system, tool change time detection method, and spectacle lens manufacturing method
CN107073849B (en) 2014-09-30 2019-09-24 依视路国际公司 For determining the method for being intended to the lens blank for manufacturing optical mirror slip
IT201900002339A1 (en) * 2019-02-18 2020-08-18 Thelios S P A METHOD OF MAKING A COATED GLASSES LENS BY PHYSICAL VAPOR PVD AND SUPPORT BODY FOR A LENS BLANK

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
DE19804455A1 (en) * 1998-02-05 1999-08-26 Wernicke & Co Gmbh Method and device for producing a facet on the edge of a spectacle lens
DE19804455C2 (en) * 1998-02-05 2001-01-11 Wernicke & Co Gmbh Method and device for producing a facet on the edge of a spectacle lens

Also Published As

Publication number Publication date
US5630746A (en) 1997-05-20
EP0706439A1 (en) 1996-04-17
DE59401095D1 (en) 1997-01-02
WO1995000292A1 (en) 1995-01-05
DE4320934C2 (en) 1995-04-20
DE4320934A1 (en) 1995-01-12

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