EP0322579B1 - Dispositif de centrage de lentilles optiques pour le montage mécanique, en particulier lors du meulage des bords et de facettes - Google Patents

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

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Publication number
EP0322579B1
EP0322579B1 EP88119934A EP88119934A EP0322579B1 EP 0322579 B1 EP0322579 B1 EP 0322579B1 EP 88119934 A EP88119934 A EP 88119934A EP 88119934 A EP88119934 A EP 88119934A EP 0322579 B1 EP0322579 B1 EP 0322579B1
Authority
EP
European Patent Office
Prior art keywords
clamping
spindle
guiding sleeve
accordance
centring
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
EP88119934A
Other languages
German (de)
English (en)
Other versions
EP0322579A2 (fr
EP0322579A3 (en
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 EP0322579A2 publication Critical patent/EP0322579A2/fr
Publication of EP0322579A3 publication Critical patent/EP0322579A3/de
Application granted granted Critical
Publication of EP0322579B1 publication Critical patent/EP0322579B1/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
    • 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
    • Y10T82/27—Centerer

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.
  • DE-AS 21 48 102 it has been proposed to arrange a piezoceramic tube oscillator on the height-adjustable clamping bell, which is controlled electrically via threshold switches so that the clamping bell drops when a predetermined pressure is reached, as a result of which the vibration generator is switched off.
  • the piezo oscillator is also used to check the clamping pressure to which the vibration amplitude is adjusted in a controlled manner.
  • electronics uncertainties are disadvantageous.
  • the transducer has a not inconsiderable sensitivity to axial pressure. The pressure load during clamping creates a preload; the support of the transducer is therefore problematic.
  • 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.
  • each centering spindle is mounted radially and axially in a sleeve, which in turn can be fixed in the machine frame via a hydraulic clamping element.
  • the clamping element consists of a sleeve which is surrounded by a cavity, the sleeve being deformed when the pressure in the cavity is increased and pressed against the guide sleeve of the centering spindle.
  • the or each air bearing can be integrated in the sleeve, which surrounds the associated guide sleeve of the centering spindle.
  • the upper centering spindle can be moved axially and clamped in place to set up the machine.
  • An adjusting screw which acts as a pressure piston makes it possible to adjust the pressure on the guide sleeve of this so-called fixed spindle as required without changing its axis orientation.
  • the centering spindle has an outer sleeve which is guided closely in the air bearing sleeve and is axially and / or radially supported at the ends.
  • the lower centering spindle the so-called clamping spindle
  • the sleeve for the guide sleeve of the clamping spindle which is firmly seated in the machine housing, is precisely aligned with the sleeve for the guide sleeve of the fixed spindle.
  • a very favorable development of the air bearing is that there are grooves between the housing and at least the lower guide sleeve of the centering spindle, which can be acted upon with pressure medium via control openings.
  • the grooves can form axially parallel and / or partially annular channels.
  • the inner wall of the guide sleeve bore with channels and pockets is preferably designed in such a way that four air cushion fields are formed in the upper and lower half, which support the clamping spindle in a positionally stable manner with compressed air supply with extremely low friction.
  • the air bearing and the associated ease of movement of the clamping spindle and the membrane piston make it possible to keep the alignment forces very small for the alignment of the lens and to adjust them sensitively, thereby avoiding damage to the lens surface during its alignment movement.
  • the cavity surrounding the clamping sleeve is subjected to high pressure, so that the clamping spindle is clamped in its position in an exact and centric position.
  • the compressed air supplied is also very beneficial during the machining process in order to prevent the penetration of coolants and abrasives or material abrasion between the guide sleeve and the clamping spindle.
  • FIG. 1 illustrates a device with a housing 10 having a bearing 12 for aligned drive shafts 14, 14 ', which act on gear elements 16, 16' on also aligned centering spindles 18, 18 '. These wear at their free ends clamping bells 20, 20 ', between which a lens L can be aligned and clamped for processing.
  • a motor M which acts via a belt drive R and a torque divider 50 on the two drive shafts 14, 14 '.
  • a chamber 44 in which a tensioning device 24 is accommodated. This makes it possible to move the lower centering spindle 18 'relative to the upper centering spindle 18' in the axial direction A in order to clamp the lens L.
  • Fig. 2 shows the upper part of the centering spindle arrangement.
  • a clamp bearing 22 ' for the upper centering spindle 18', which is also referred to as a fixed spindle. It has a guide sleeve 19 ', which is supported radially and axially via support bearings 74a, 74b with respect to the inner centering spindle 18'.
  • the clamp bearing 22 ' has a thin-walled sleeve 76 which surrounds the centering spindle 18' or its guide sleeve 19 'in the housing 10 and is in turn surrounded by a cavity 78 in which the adjusting screw 80 acting as a pressure piston corresponds to the respective requirement Clamping pressure on the guide sleeve 76 is adjustable.
  • a lens L can be clamped with a clamping angle. This is the angle that the two tangents at the points of contact between the lens surfaces and the clamping bells 20, 20 'to each other. Due to the physical friction coefficient, the angle ⁇ must be greater than 2 x 8 °> 16 °.
  • the lower centering spindle arrangement according to FIG. 3 is used for clamping.
  • the lower centering spindle 18 has also called clamping spindle, also a guide sleeve 19, which is supported axially and radially via support bearings 84a, 84b with respect to the inner, actual centering spindle 18.
  • a corrugated spring 82 is arranged between the lower support bearing 84a and a collar of a coupling piece 34, which permits a limited axial displacement of the guide sleeve and centering spindle relative to one another.
  • the coupling piece 34 consists of two gear wheels 36, 37 with internal and external teeth, the gear wheel 36 being connected to the centering spindle 18 in a rotationally fixed manner.
  • the gearwheel 37 is supported on the housing 10 via a radial bearing 35.
  • the gear 36 is so wide that the gears 36, 37 do not come out of engagement even with the required axial displacement of the centering spindle.
  • the gearwheel 37 is designed as a pulley on which the gear element 16 (ie a drive belt) engages.
  • the tensioning device 24 has a plate 26 designed as a yoke, which has a hollow space with a membrane piston 32 in the center. By applying pressure medium, the diaphragm piston 32 can be moved upwards to raise the clamping spindle 18 together with the lens L resting on the clamping bell 20 to the upper clamping bell 20 '.
  • the clamp bearing 22 for the clamping spindle 18 is additionally designed according to the invention as an air bearing.
  • grooves 90 are provided on the circumference of the thin-walled guide sleeve 86, in particular at its two ends, which can be acted upon with pressure medium via control openings A i and B i .
  • these grooves 90 are designed as axially parallel and partially annular channels, which in particular form four air cushion fields, thanks to which the centering spindle 18 or its outer sleeve 19 is axially displaceable in the clamp bearing 22 with extremely little friction, while at the same time ensuring an exact axial alignment of the centering spindle.
  • the guide sleeve 19 of the clamping spindle 18 is guided in an air-supported manner, thereby reducing the friction for the axial clamping movement to a minimum and, at the same time, ensuring high axial alignment accuracy.
  • the alignment forces required for aligning the lens L can be set sensitively by the membrane piston 32.
  • the cavity 88 is put under high pressure by a pressure medium through the bore 98 and the thin-walled guide sleeve 86 deforms towards the center and clamps the clamping spindle in an exactly aligned manner.
  • the clamping force necessary for processing the lens L is transmitted to the centering spindle 18.
  • the resulting slight axial movement of the clamping spindle 18 takes place in its own bearing 84a and 84b, the corrugated spring 82 being tensioned somewhat more.

Landscapes

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

Claims (7)

  1. Dispositif de centrage de lentilles optiques pour leur maintien mécanique, en particulier lors du meulage des bords et de facettes, avec un carter (10), avec un dispositif d'entraînement pour entraîner deux broches de centrage (18, 18') qui sont alignées dans la direction axiale (A) et dont les extrémités en vis-à-vis portent des cloches de serrage (20, 20'), entre lesquelles peut être serrée, en vue de son usinage, une lentille (L) au moyen d'un dispositif de serrage (24) agissant sur au moins une broche de centrage (18) ou cloche de serrage (20), les broches de centrage (18, 18') étant disposées dans un premier manchon de guidage (19, 19') et soutenues dans ce dernier par des paliers de soutien (84a, 84b; 74a, 74b), caractérisé en ce que chaque premier manchon de guidage (19) est guidé dans au moins un second manchon de guidage (76, 86) à paroi mince, qui est maintenu dans le bâti de machine (10) ou formé dans celui-ci, et est entouré par une cavité (78), en ce que chaque cavité (78) peut être alimentée en fluide qui, afin de bloquer par serrage le premier manchon de guidage (19), peut être mis sous pression et déformer le second manchon de guidage (76, 86) à paroi mince, et en ce que la broche de centrage (18) peut être déplacée en coulissement, d'une manière axialement limitée, par rapport au premier manchon de guidage (19).
  2. Dispositif selon la revendication 1, caractérisé en ce qu'au moins un des deux premiers manchons de guidage (19) est en outre guidé dans le bâti de machine (10) par l'intermédiaire d'un ou plusieurs paliers à air (90).
  3. Dispositif selon la revendication 2, caractérisé en ce que les paliers à air sont formés par des rainures (90) pratiquées sur la paroi intérieure du second manchon de guidage (76, 86), et qui sont reliées à des branchements de commande (Ai, Bi) par des perçages de raccordement (95).
  4. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la pression régnant dans la cavité (78) d'un des paliers de blocage de préférence du palier de serrage à bloc supérieur (22), peut être établie au moyen d'une vis de commande (80) traversant en étanchéité la paroi du carter (10).
  5. Dispositif selon la revendication 4, caractérisé en ce que les rainures (90) forment des canaux parallèles à l'axe et/ou en forme d'anneaux partiels (figures 3 et 4).
  6. Dispositif selon la revendication 4 ou 5, caractérisé en ce qu'au moins deux ouvertures de commande diamétralement opposées (par exemple A₂, A₄) peuvent être sélectivement commandées au moyen d'un distributeur de commande (92) et isolées des autres ouvertures ou canaux de commande par des soupapes d'isolement (94), dont l'ouverture produit une purge d'air lors de la commutation du distributeur de commande (92) (figures 4 et 5).
  7. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'extrémité inférieure de la broche de centrage inférieure (18) est soutenue, par l'intermédiaire d'un piston à membrane (32), par un dispositif de serrage (24).
EP88119934A 1987-12-24 1988-11-30 Dispositif de centrage de lentilles optiques pour le montage mécanique, en particulier lors du meulage des bords et de facettes Expired - Lifetime EP0322579B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3744115 1987-12-24
DE3744115A DE3744115C2 (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
EP0322579A2 EP0322579A2 (fr) 1989-07-05
EP0322579A3 EP0322579A3 (en) 1990-09-05
EP0322579B1 true EP0322579B1 (fr) 1993-02-03

Family

ID=6343615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119934A Expired - Lifetime EP0322579B1 (fr) 1987-12-24 1988-11-30 Dispositif de centrage de lentilles optiques pour le montage mécanique, en particulier lors du meulage des bords et de facettes

Country Status (4)

Country Link
US (1) US4951421A (fr)
EP (1) EP0322579B1 (fr)
DE (1) DE3744115C2 (fr)
ES (1) ES2037805T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6257968B1 (en) 1998-12-16 2001-07-10 National Optronics, Incorporated Quick-release lens clamp pad assembly for use in eyeglass lens processing
US6243960B1 (en) 1999-03-16 2001-06-12 National Optronics, Incorporated Tracer, clamp and object engager for holding and tracing a lens mount of an eyeglass frame, a lens, and/or a lens pattern, to reliably detect a shape thereof even when the shape includes high wrap
USD435053S (en) * 1999-03-16 2000-12-12 National Optronics, Incorporated Eyeglass frame tracer
US6249991B1 (en) 1999-03-17 2001-06-26 National Optronics, Incorporated Control system for eyeglass tracer
DE10008710C2 (de) 2000-02-24 2002-01-10 Loh Optikmaschinen Ag Vorrichtung zum zentrierenden Spannen von optischen Linsen für deren Randbearbeitung

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2508009A (en) * 1946-09-11 1950-05-16 Simonds Machine Co Inc Edging machine
NL87175C (fr) * 1950-01-24
NL152774A (fr) * 1950-01-24
DE1004516B (de) * 1956-03-02 1957-03-14 Voigtlaender Ag Verfahren und Maschine zum Zentrieren von optischen Linsen
US3143382A (en) * 1961-06-06 1964-08-04 Commissariat Energie Atomique Aerodynamic 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
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
DE3744115A1 (de) 1989-07-06
DE3744115C2 (de) 1994-03-31
ES2037805T3 (es) 1993-07-01
EP0322579A2 (fr) 1989-07-05
EP0322579A3 (en) 1990-09-05
US4951421A (en) 1990-08-28

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