EP0323572B1 - Dispositif de centrage de lentilles optiques pour le montage mécanique, en particulier lors du moulage des bords et de facettes - Google Patents

Dispositif de centrage de lentilles optiques pour le montage mécanique, en particulier lors du moulage des bords et de facettes Download PDF

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Publication number
EP0323572B1
EP0323572B1 EP88119936A EP88119936A EP0323572B1 EP 0323572 B1 EP0323572 B1 EP 0323572B1 EP 88119936 A EP88119936 A EP 88119936A EP 88119936 A EP88119936 A EP 88119936A EP 0323572 B1 EP0323572 B1 EP 0323572B1
Authority
EP
European Patent Office
Prior art keywords
clamping
spindle
pressure
centring
axially
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
EP88119936A
Other languages
German (de)
English (en)
Other versions
EP0323572A3 (en
EP0323572A2 (fr
Inventor
Erhard Brück
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.)
Wilhelm Loh Wetzlar Optikmaschinen GmbH and Co KG
Original Assignee
Wilhelm Loh Wetzlar Optikmaschinen GmbH and Co KG
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 Wilhelm Loh Wetzlar Optikmaschinen GmbH and Co KG filed Critical Wilhelm Loh Wetzlar Optikmaschinen GmbH and Co KG
Publication of EP0323572A2 publication Critical patent/EP0323572A2/fr
Publication of EP0323572A3 publication Critical patent/EP0323572A3/de
Application granted granted Critical
Publication of EP0323572B1 publication Critical patent/EP0323572B1/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
    • 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
    • B24B9/146—Accessories, e.g. lens mounting devices
    • 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S82/00—Turning
    • Y10S82/903—Balancing and centering
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2552—Headstock
    • Y10T82/2562—Spindle and bearings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2568—Center
    • Y10T82/2571—Alignment adjuster
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/26—Work driver

Definitions

  • the present invention relates to a device for centering optical lenses for mechanical mounting, in particular for edge grinding and faceting, according to the preamble of claim 1 (see e.g. DE-A-2 756 407).
  • the lens has been clamped at high pressure between two bells so that its position no longer changes automatically.
  • the clamping bells were vibrated by ultrasound during the clamping process in order to convert the static friction between the bell and the lens into a lower sliding friction.
  • this transition took place suddenly, which often caused damage to the lens with undesired material removal.
  • a device is known in which irregularities of a gear drive are exploited to generate relative movements between the lens and the clamping bell.
  • a balance beam differential is provided in a bevel gear train between the two parts of a two-part centering spindle and drive shaft.
  • a hydraulic clamping cylinder is available for a pressure plate of the upper, axially movable spindle. Due to the high friction of the clamping spindle in its slide bearing, however, it is difficult to achieve fine regulation of the clamping pressure, so that this device can also be used only to a limited extent.
  • the object of the invention is to improve the centering and alignment of lenses by means of clamping elements in a simple manner while overcoming the disadvantages of the prior art, whereby damage to the lenses by a sensitive delivery can be avoided.
  • the centering spindles are designed as rigid, radially and axially directly supported shafts and can be moved toward and away from one another by means of a pressure medium-operated, in particular hydraulic, clamping device. So the spindle shafts themselves are used directly for play-free radial and axial bearings.
  • the spindle is additionally supported by a membrane piston that works in parallel with the clamping device.
  • the clamping spindles are roughly set by the clamping device, but the lens is not yet clamped between the clamping bells. Then the sensitive delivery takes place by means of the membrane piston, so that the lens can align itself between the clamping bells, damage to the lens being avoided.
  • the static friction can be converted into sliding friction using the means described at the beginning. After the alignment process, the actual clamping process then takes place using the clamping device.
  • the cylinder housings with the yoke connecting them move axially in the direction of the fixed spindle due to the pressure acting on the long-stroke pistons. Since the clamping force for machining the lens exceeds the pressure generated for aligning the lens by a multiple, the membrane piston sits on the yoke and the clamping force of the long-stroke piston fully affects the shaft of the clamping spindle.
  • the pressure acting on the long-stroke piston is set so high that the force applied to the spindle shaft via the yoke is as great as that required on the lens Clamping force plus the spring force with which the axial bearing of the clamping spindle is set.
  • the axial guidance accuracy during the processing of the lens is taken over by the axial bearing of the fixed spindle.
  • clamping device allows the required clamping forces to be applied with a very clear and inexpensive construction.
  • double-acting pressure cylinders are used, which, according to claim 3, are attached to a yoke plate with their housing part and are anchored to the machine housing with their piston rods.
  • Each pressure cylinder advantageously has a short-stroke piston, which is followed by a long-stroke piston with an axial through-bore. This allows the rough delivery to be limited in a simple manner, in which case only the short-stroke piston, which serves to limit the stroke of the long-stroke piston, has to be displaced for the clamping process.
  • the yoke axially supports the lower end of the clamping spindle via the membrane piston.
  • the axial movement of the tensioning device can be controllable according to claim 7 by pressure regulators, dynamometers and the like, which act on the pressure cylinders. This is one good control of the clamping process is guaranteed, so that any rejects during processing are kept to a minimum.
  • the gear elements are designed and arranged so that the clamping device can be actuated independently of the drive state of the clamping spindle. Their axial movement can therefore be precisely controlled at any moment.
  • the device shown has a housing 10 with a shaft bearing 12 for a split drive shaft 14, 14 '. This is via gear elements 16, 16 'with centering spindles 18, 18' in drive connection.
  • the lower centering spindle 18 carries a lower clamping bell 20, the upper centering spindle 18 'an upper clamping bell 20'. In between, a lens L can be clamped for processing.
  • the centering spindles 18, 18 ' are driven synchronously by a motor M via the gear elements 16, 16', the drive shafts 14, 14 ', the torque divider 50 and the belt drive R.
  • the generally C-shaped housing 10 has a lower guide and clamping bearing 22 for the lower centering spindle 18 or an upper guide and clamping bearing 22 'for the upper centering spindle 18' on projecting parts. These guide and clamping bearings are used for the central fixing of the centering spindles during the machining process.
  • a clamping device 24 is accommodated, which can be actuated independently of the gear elements 16 in order to press the lower centering spindle 18 axially aligned with the lens L resting on the lower clamping bell 20 against the upper clamping bell 20 '.
  • the clamping device 24 has a yoke 26 designed as a plate, to which two pressure cylinders 28 with their housing parts are fastened on both sides of the centering spindle axis A.
  • the piston rods 30 of the pressure cylinder 28 pass through the yoke plate 26 freely; they are anchored to a housing plate 29 and have axial through holes 42 to allow double-acting pressurization (as indicated by arrow triangles).
  • a diaphragm piston 32 is arranged centrally in the yoke 26 and acts axially on the lower end of the lower centering spindle 18 via a thrust bearing 33. This is supported axially and radially exactly in a drive wheel 34 with radial bearing 35 and coupling piece 36.
  • the spindle 18 has an outer sleeve 19 which is connected to the inner spindle shaft 18 via a support bearing 84a. This ensures a particularly precise axial and radial support of the centering spindle 18.
  • the pressure cylinders 28 each have a short-stroke piston 38, which is followed by a long-stroke piston 40 with a piston rod 30. If the pressure cylinders 28 at the pressure medium connections I and II are simultaneously acted upon by the same pressure medium, the short-stroke pistons 38 move up to the upper stop in the cylinder housing and the cylinders 28 with the yoke plate 26 and the centering spindle 18 (clamping spindle) held thereon move in the direction of the upper centering spindle 18 '(fixed spindle). The upward movement comes to a standstill as soon as the long-stroke piston 40 strikes the likewise pressurized short-stroke piston 38, which has a larger effective pressure area. In this Position, the fixed spindle 18 'is set so that there is a gap of a few tenths of a millimeter between its clamping bell 20' and the lens L lying on the lower clamping bell 20.
  • the clamping spindle 18 is moved further upward via the diaphragm piston 32. During this axial movement, the lower centering spindle 18 is guided very precisely in the air bearings 90 with extremely little friction. Because the membrane piston 32 also has a very low internal friction, the clamping force required for the alignment of the lens L can be set very sensitively. When the upper clamping bell 20 'touches the upper lens surface, displacement forces act on the lens L, which overcome the static friction of the lens L on the lower clamping bell 20. The lens L therefore shifts and aligns itself with the optical axis A.
  • the thin-walled guide sleeve 86 is deformed centrically towards the center and clamps the guide sleeve 19 with the spindle 18 in the set position without changing the axial position.
  • the clamping force required for processing the lens L exceeds the pressure generated for alignment by means of the membrane piston 32 by a multiple. Therefore, the membrane piston 32 sits on the yoke 26, so that the clamping force of the long-stroke piston 40 fully acts on the shaft of the clamping spindle 18.
  • the pressure acting on the long-stroke piston 40 is set so high that the force applied via the yoke 26 to the lower centering spindle is as great as the clamping force required on the lens L plus the force of the spring 82 with which the axial bearing of this clamping spindle 18 is set.
  • the support bearing 74b of the upper centering spindle 18 ' For the axial guidance accuracy during lens processing, the support bearing 74b of the upper centering spindle 18 '.

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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)

Claims (20)

  1. Dispositif de centrage de lentilles optiques pour leur fixation mécanique, en particulier lors du meulage des bords et de la réalisation de facettes, comportant un carter (10), dans lequel est monté un arbre d'entraînement (14, 14') qui grâce à un moteur et par l'intermédiaire d'organes de transmission (16, 16'), entraîne deux broches de centrage (18, 18') alignées suivant la direction axiale (A), dont les extrémités tournées l'une vers l'autre portent des cloches de serrage (20, 20'), entre lesquelles peut être serrée, pour son usinage, une lentille (L), qui peut être pressée, en reposant sur la première cloche de serrage (20), à l'aide d'une broche de serrage (18) déplaçable axialement, contre la deuxième cloche de serrage (20'), qui est maintenue par une broche fixe (18'), disposée de façon à pouvoir être réglée axialement, étant entendu que l'on peut faire déplacer les broches de centrage en les rapprochant ou en les éloignant l'une de l'autre, au moyen d'un dispositif de serrage actionné par un fluide de pression, caractérisé en ce que les broches de centrage (18, 18') sont réalisées sous la forme d'arbres rigides, montés directement sur paliers radialement et axialement, en ce qu'au moins un vérin de pression (28) est disposé parallèlement à la direction axiale, pour faire coulisser la broche de serrage (18), et en ce que l'extrémité de la broche de serrage (18) prend appui axialement sur le vérin de pression (28) par l'intermédiaire d'un piston à membrane (32).
  2. Dispositif suivant la revendication 1, caractérisé en ce que le dispositif de serrage (24) présente une traverse (26) qu'on peut faire coulisser parallèlement à la direction axiale (A) au moyen de deux vérins de pression (28) à double effet, disposés des deux côtés de la broche de serrage (18).
  3. Dispositif suivant la revendication 2, caractérisé en ce que les vérins de pression (28) sont fixés par leur corps, à la plaque (26) et en ce que leurs tiges de piston (30) sont ancrées sur le carter de la machine (10, 29).
  4. Dispositif suivant la revendication 2 ou la revendication 3, caractérisé en ce que chaque vérin de pression (28) présente un piston à course réduite (38), après lequel est disposé un piston à longue course (40) comportant un alésage traversant (42).
  5. Dispositif suivant l'une quelconque des revendications 2 à 4, caractérisé en ce que la traverse (26) est fixée à l'extrémité de la broche de serrage (18).
  6. Dispositif suivant l'une quelconque des revendications 1 à 5, caractérisé en ce qu'à l'extrémité de la broche de serrage, est fixée une pièce d'accouplement (36), qui est accouplée géométriquement avec une roue d'entraînement (34), mais avec possibilité de coulissement axial, cette roue étant reliée au carter (10, 29) par l'intermédiaire d'un palier radial (35).
  7. Dispositif suivant l'une quelconque des revendications 1 à 6, caractérisé en ce que le mouvement axial du dispositif de serrage (24) peut être commandé par des moyens de commande, agissant sur les vérins de pression (28), comme des régulateurs de pression, des dynamomètres, ou similaires.
  8. Dispositif suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que les organes de transmission (16, 16') attaquent le dispositif de serrage (24) de telle façon que la broche de serrage (18) puisse être déplacé axialement au moyen du dispositif de serrage (24), indépendamment de la position d'entraînement.
  9. Dispositif suivant l'une quelconque des revendications 1 à 8, caractérisé en ce que les organes de transmission (16, 16') sont entraînés par l'intermédiaire d'un arbre d'entraînement (14, 14') en deux parties.
  10. Dispositif suivant l'une quelconque des revendications 1 à 9, caractérisé en ce que les broches de centrage (18, 18') sont disposées de façon à reposer verticalement.
  11. Dispositif suivant l'une quelconque des revendications 1 à 10, caractérisé en ce que chacune des broches de centrage (18, 18') est disposée dans une douille de guidage (19, 19') et prend appui sur celle-ci par l'intermédiaire de paliers d'appui (84a, 84b; 74a, 74b), et en ce qu'au moins l'une des deux douilles de guidage (19, 19') est, de plus, guidée dans le carter (10) de la machine au moyen d'un ou plusieurs paliers à air (90).
  12. Dispositif suivant la revendication 11, caractérisé en ce que la broche de serrage (18) supérieure est également montée sur un palier à air.
  13. Dispositif suivant la revendication 11 ou la revendication 12, caractérisé en ce que le palier à air (90), ou chacun des paliers à air (90), présente une douille de guidage mince (76, 86), qui entoure étroitement la broche de centrage (18, 18') concernée, ou sa douille de guidage (19, 19'), et qui, de son côté, est entourée par un volume creux (78, 88) pouvant recevoir un fluide sous pression, et forme ainsi un palier de serrage (22, 22').
  14. Dispositif suivant l'une quelconque des revendications 11 à 13, caractérisé en ce que le volume creux, d'une part, est formé par la douille de guidage (76, 86) et, d'autre part, par des parties de support en saillie (100, 100') du carter (10), réalisé, dans son ensemble, en forme de C, parties qui maintiennent alignés les paliers de serrage (22, 22') l'un par rapport à l'autre.
  15. Dispositif suivant l'une quelconque des revendications 11 à 14, caractérisé en ce que la pression du volume creux supérieur (78) peut être réglée ou réajustée au moyen d'un dispositif de réglage (80).
  16. Dispositif suivant l'une quelconque des revendications 11 à 15, caractérisé en ce qu'au moins le palier de mise en serrage inférieur (22) présente un raccord (98) pour une conduite d'alimentation.
  17. Dispositif d'après au moins l'une des revendications 12 à 16, caractérisé en ce que les paliers à air (90) se faisant face peuvent être alimentés avec des pressions différentes.
  18. Dispositif suivant la revendication 17, caractérisé en ce que la fréquence et la pression de l'alimentation en pression peuvent être régulées ou réglées pneumatiquement et/ou électriquement.
  19. Dispositif d'après au moins l'une des revendications 13 à 18, caractérisé en ce que la paroi intérieure de la douille, ou de chacune des douilles, de guidage (76, 86) présente des canaux et/ou des poches (90), en particulier chaque fois sous la forme de quatre champs de coussins d'air.
  20. Dispositif suivant la revendication 19, caractérisé en ce que les canaux ou poches (90) sont réalisés sous la forme de rainures à parallèles à l'axe et/ou de parties de gorge annulaire.
EP88119936A 1987-12-24 1988-11-30 Dispositif de centrage de lentilles optiques pour le montage mécanique, en particulier lors du moulage des bords et de facettes Expired - Lifetime EP0323572B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3744118 1987-12-24
DE3744118A DE3744118C2 (de) 1987-12-24 1987-12-24 Maschine zum zentrierenden Randschleifen und Facettieren von optischen Linsen für ihre mechanische Halterung

Publications (3)

Publication Number Publication Date
EP0323572A2 EP0323572A2 (fr) 1989-07-12
EP0323572A3 EP0323572A3 (en) 1990-08-29
EP0323572B1 true EP0323572B1 (fr) 1993-02-03

Family

ID=6343618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119936A Expired - Lifetime EP0323572B1 (fr) 1987-12-24 1988-11-30 Dispositif de centrage de lentilles optiques pour le montage mécanique, en particulier lors du moulage des bords et de facettes

Country Status (4)

Country Link
US (1) US4926588A (fr)
EP (1) EP0323572B1 (fr)
DE (1) DE3744118C2 (fr)
ES (1) ES2037806T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10008710C2 (de) 2000-02-24 2002-01-10 Loh Optikmaschinen Ag Vorrichtung zum zentrierenden Spannen von optischen Linsen für deren Randbearbeitung
DE102012010005A1 (de) 2012-05-22 2013-11-28 Satisloh Ag Zentriermaschine für Werkstücke, insbesondere optische Linsen
CN113829173B (zh) * 2021-09-22 2024-01-02 上饶市桐宇光电科技有限公司 一种基于光学镜片高效打磨装置

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Publication number Priority date Publication date Assignee Title
US2508009A (en) * 1946-09-11 1950-05-16 Simonds Machine Co Inc Edging machine
DE1004516B (de) * 1956-03-02 1957-03-14 Voigtlaender Ag Verfahren und Maschine zum Zentrieren von optischen Linsen
US3359045A (en) * 1966-05-20 1967-12-19 Bendix Corp Squeeze film bearing
US3599377A (en) * 1968-07-22 1971-08-17 Bausch & Lomb Lens alignment using gas bearings
GB1310135A (en) * 1970-07-22 1973-03-14 Raphael O P Method of and apparatus for filling spectacle lenses
DE2148102C3 (de) * 1971-09-27 1979-07-05 Ernst Leitz Wetzlar Gmbh, 6300 Lahn- Wetzlar Verfahren zum Zentrieren von Linsen
GB1332414A (en) * 1971-12-02 1973-10-03 Produmatic Sa Machine tools
DK338978A (da) * 1977-08-02 1979-02-03 Automated Optics Kontaktlinse samt fremgangsmaade og maskine til fremstilling af saadanne linser
DE2756407A1 (de) * 1977-12-17 1979-06-21 Prontor Werk Gauthier Gmbh Maschine zum randschleifen und facettieren von optischen linsen
DE3139873C2 (de) * 1981-10-07 1983-11-10 Prontor-Werk Alfred Gauthier Gmbh, 7547 Wildbad Maschine zum Randschleifen und Facettieren von optischen Linsen
FR2553323B1 (fr) * 1983-10-18 1986-07-25 Essilor Int Procede et machine pour le biseautage ou rainurage d'une lentille ophtalmique
FR2565147B1 (fr) * 1984-06-04 1988-04-01 Essilor Int Machine a meuler pour lentille ophtalmique, notamment pour le detourage et/ou le biseautage ou rainurage de celle-ci
DE8437438U1 (de) * 1984-12-21 1985-03-21 Wernicke & Co GmbH, 4000 Düsseldorf Vorrichtung an brillenglasrandschleifmaschinen zum halten des brillenglases
DE3526539C1 (de) * 1985-07-24 1986-11-13 Erwin 7611 Nordrach Junker Verfahren zur Praezisionsschnellspannung von rotationssymmetrischen Werkstuecken sowie Praezisionsschnellspannvorrichtung zur Durchfuehrung des Verfahrens
DE8702561U1 (de) * 1987-02-19 1987-06-04 Wernicke & Co GmbH, 4000 Düsseldorf Glashalterung für Brillenglasrandschleifmaschinen

Also Published As

Publication number Publication date
EP0323572A3 (en) 1990-08-29
EP0323572A2 (fr) 1989-07-12
ES2037806T3 (es) 1993-07-01
US4926588A (en) 1990-05-22
DE3744118A1 (de) 1989-07-06
DE3744118C2 (de) 1994-04-21

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