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EP0706439B1 - Machine a meuler les bords de verres de lunettes - Google Patents

Machine a meuler les bords de verres de lunettes 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)
English (en)
Other versions
EP0706439A1 (fr
Inventor
Lutz Gottschald
Klaus Eickmeyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wernicke and Co GmbH
Original Assignee
Wernicke and Co GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wernicke and Co GmbH filed Critical Wernicke and Co GmbH
Publication of EP0706439A1 publication Critical patent/EP0706439A1/fr
Application granted granted Critical
Publication of EP0706439B1 publication Critical patent/EP0706439B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • 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

L'invention concerne une machine à meuler les bords de verres de lunettes qui comprend au moins une meule, un arbre servant à la fixation des verres de lunettes, rotatif et déplaçable au moins dans le sens radial par rapport à la meule, au moins un élément d'appui qui coopère par contact avec un verre de lunettes au contour périphérique meulé, un transducteur servant à détecter au moins une valeur réelle du contour périphérique par rapport à l'élément d'appui, un ordinateur qui commande la machine à meuler les verres de lunettes et qui compare les valeurs théoriques concernant le contour périphérique du verre de lunettes à meuler, qu'il a mémorisées, et au moins une des valeurs réelles mesurées du contour périphérique. Ledit ordinateur sert également à assurer la commande d'un processus de meulage supplémentaire en cas d'écart par rapport à la ou aux valeur(s) réelle(s), écart qui peut être introduit en tant qu'écart admissible dans ledit ordinateur.

Claims (16)

  1. Machine à meuler le bord de verres de lunettes comportant
    - au moins un disque de meulage (11),
    - un arbre de maintien de verre de lunettes (14) tournant, réglable au moins radialement par rapport au disque de meulage (11),
    - au moins un support (23) coopérant en contact avec un verre de lunettes (24) meulé sur son contour périphérique,
    - un capteur de valeurs de mesure (17) pour l'enregistrement d'au moins une valeur réelle du contour périphérique (25) par référence au support (23)
    - un calculateur (16), commandant la machine à meuler le bord de verres de lunettes pour la comparaison de valeurs de consigne, stockées dans celui-ci, du contour périphérique (25) du verre de lunettes (24) à meuler, avec au moins la valeur réelle mesurée du contour périphérique et pour la commande d'une opération de meulage supplémentaire, en cas de dépassement d'un écart admissible, à introduire dans le calculateur (16), de la ou des valeur(s) réelle(s) par rapport aux valeurs de consigne.
  2. Machine à meuler le bord de verres de lunettes selon la revendication 1, caractérisée en ce que le ou les support(s) est ou sont constitué(s) d'anneaux (23) ou de segments d'anneaux étroits, disposés sur le côté du disque de meulage (11) ou des disques de meulage (11, 12), fixes par rapport au(x) disque(s) de meulage, sur lequel ou lesquels le verre de lunettes (24) est transféré après meulage du contour périphérique (25).
  3. Machine à meuler le bord de verres de lunettes selon la revendication 1 ou 2, caractérisée en ce que la tête de palpage (23) destinée à capter au moins une valeur de rayon présente une rainure à clavette (28) avec un angle de coin égal à l'angle aigu maximal admissible d'une facette de toit (30) du verre de lunettes (24).
  4. Machine à meuler le bord de verres de lunettes selon la revendication 3, caractérisée en ce que la tête de palpage (23) présente, en supplément à la rainure à clavette (28), une zone plate (29) pour capter au moins une valeur de rayon de la pointe de la facette de toit (30).
  5. Machine à meuler le bord de verres de lunettes selon les revendications 2, 3 ou 4, caractérisée en ce que les anneaux (23) ou segments d'anneaux sont disposés de part et d'autre d'un disque de meulage préliminaire (11) et les anneaux (23) ou segments d'anneaux forment une tête de palpage pour mesurer la courbe géométrique du contour de verre de lunettes (25).
  6. Machine à meuler le bord de verres de lunettes selon l'une des revendications 1 à 5, caractérisée en ce que le (les) disque(s) de meulage (11, 12) sont étroitement entourés par une protection moulée par injection (22) fixe à l'exception de la zone de meulage et les anneaux (23) ou segments d'anneaux sont placés sur la protection moulée par injection.
  7. Machine à meuler le bord de verres de lunettes selon une ou plusieurs des revendications 1 à 6 caractérisée en ce que le calculateur (16) coopère avec un dispositif en vue de la commande de la position axiale de l'arbre de maintien de verres de lunettes (14) avec le verre de lunettes (24), par rapport au disque de meulage (11, 12), suivant la courbe géométrique du contour périphérique (25) du verre de lunettes, et ce dispositif opère aussi lors de l'enregistrement des valeurs réelles du contour périphérique (25) au moyen du support (23).
  8. Machine à meuler le bord de verres de lunettes selon une ou plusieurs des revendications 1 à 7, caractérisée par un entraînement (18), agissant par l'intermédiaire d'un accouplement réglable (19), pour le réglage radial du (des) disque(s) de meulage (11, 12) par rapport à l'arbre de maintien du verre de lunettes (14) et par un dispositif de commutation agissant sur l'accouplement (19), dans le sens d'une réduction du couple de rotation transmis, lors de l'enregistrement des valeurs réelles du contour périphérique (25).
  9. Machine à meuler le bord de verres de lunettes selon une ou plusieurs des revendications 1 à 8, caractérisée en ce que le (les) disque(s) de meulage (11, 12) est (sont) placé(s) avec leur entraînement de manière à pouvoir coulisser sur un chariot en croix (2), par rapport à l'arbre de maintien de verre (14), monté tournant dans le bâti (1) de la machine et le capteur de valeurs de mesure (17) mesure la translation du chariot en croix (2) dans le bâti (1) de la machine par rapport au contour périphérique (25) du verre de lunettes (24) meulé à la forme.
  10. Machine à meuler le bord de verres de lunettes selon une ou plusieurs des revendications 1 à 9, caractérisée par un capteur de valeurs de mesure numérique (17).
  11. Procédé d'usinage des bords de verres de lunettes au moyen d'une machine à meuler le bord de verres de lunettes selon une ou plusieurs des revendications 1 à 10, caractérisé en ce que le rayon d'un angle correspondant à prédéterminer, d'au moins un point périphérique d'un verre de lunettes meulé sur son contour périphérique est mesuré par rapport à un support la valeur de mesure est introduite dans un calculateur, est comparée avec une valeur de consigne mémorisée et en cas de dépassement d'un écart admissible, à introduire dans le calculateur, de la valeur réelle par rapport à la valeur de consigne, il est effectué un meulage supplémentaire du contour périphérique avec une correction correspondant à l'écart.
  12. Procédé selon la revendication 11, caractérisé en ce que le rayon d'au moins un point périphérique d'une facette de toit du verre de lunettes meulé sur son contour périphérique, est mesuré par rapport à une rainure à clavette dans le support.
  13. Procédé selon la revendication 12, caractérisé en ce que le rayon d'au moins un point périphérique de la facette de toit du verre de lunettes meulé sur son contour périphérique, est mesuré tant par rapport à la rainure à clavette dans le support que par rapport à une zone plate du support et, par comparaison des valeurs mesurées il est déterminé si une correction de l'écart de la valeur réelle par rapport à la valeur de consigne, mesuré par rapport à la rainure à clavette, est possible.
  14. Procédé selon l'une des revendications 11 à 13, caractérisé en ce que l'ensemble du contour périphérique est mesuré est comparé aux valeurs de consigne mémorisées, en cas de dépassement de l'écart, admissible à introduire dans le calculateur, des valeurs réelles par rapport aux valeurs de consigne, le calculateur procède à une moyenne des écarts mesurés et exécute le meulage supplémentaire du contour périphérique conformément aux valeurs moyennes.
  15. Procédé selon l'une des revendications 11 à 13, caractérisé en ce que l'ensemble du contour périphérique est mesuré est comparé aux valeurs de consigne mémorisées et en cas de dépassement par endroits de l'écart admissible, à introduire dans le calculateur, des valeurs réelles par rapport aux valeurs de consigne, le meulage supplémentaire n'est effectué que dans les zones du contour périphérique, présentant un écart inadmissible.
  16. Procédé selon l'une des revendications 11 à 15, caractérisé en ce que la mesure du contour périphérique d'un verre de lunettes meulé sur son contour périphérique est effectuée à une vitesse de rotation de l'arbre de maintien du verre de lunettes, supérieure à celle du meulage.
EP94920937A 1993-06-24 1994-06-15 Machine a meuler les bords de verres de lunettes Expired - Lifetime EP0706439B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4320934A DE4320934C2 (de) 1993-06-24 1993-06-24 Brillenglasrandschleifmaschine
DE4320934 1993-06-24
PCT/EP1994/001945 WO1995000292A1 (fr) 1993-06-24 1994-06-15 Machine a meuler les bords de verres de lunettes

Publications (2)

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

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94920937A Expired - Lifetime EP0706439B1 (fr) 1993-06-24 1994-06-15 Machine a meuler les bords de verres de lunettes

Country Status (4)

Country Link
US (1) US5630746A (fr)
EP (1) EP0706439B1 (fr)
DE (2) DE4320934C2 (fr)
WO (1) WO1995000292A1 (fr)

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US6325704B1 (en) * 1999-06-14 2001-12-04 Corning Incorporated Method for finishing edges of glass sheets
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JP5372628B2 (ja) * 2009-07-08 2013-12-18 株式会社ニデック 眼鏡レンズ加工装置及び該装置に使用されるヤゲン加工具
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DE19804455A1 (de) * 1998-02-05 1999-08-26 Wernicke & Co Gmbh Verfahren und Vorrichtung zum Herstellen einer Facette auf dem Rand eines Brillenglases
DE19804455C2 (de) * 1998-02-05 2001-01-11 Wernicke & Co Gmbh Verfahren und Vorrichtung zum Herstellen einer Facette auf dem Rand eines Brillenglases

Also Published As

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

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