EP0159383A1 - Machine pour meuler les surfaces toriques de lentilles optiques - Google Patents

Machine pour meuler les surfaces toriques de lentilles optiques Download PDF

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Publication number
EP0159383A1
EP0159383A1 EP84104714A EP84104714A EP0159383A1 EP 0159383 A1 EP0159383 A1 EP 0159383A1 EP 84104714 A EP84104714 A EP 84104714A EP 84104714 A EP84104714 A EP 84104714A EP 0159383 A1 EP0159383 A1 EP 0159383A1
Authority
EP
European Patent Office
Prior art keywords
holder
swivel arm
machine frame
machine
machine according
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.)
Granted
Application number
EP84104714A
Other languages
German (de)
English (en)
Other versions
EP0159383B1 (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.)
Satisloh GmbH
Original Assignee
Loh Optikmaschinen AG
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 Loh Optikmaschinen AG filed Critical Loh Optikmaschinen AG
Priority to DE8484104714T priority Critical patent/DE3467317D1/de
Priority to EP84104714A priority patent/EP0159383B1/fr
Priority to US06/726,527 priority patent/US4653233A/en
Priority to ES85542581A priority patent/ES8605174A1/es
Publication of EP0159383A1 publication Critical patent/EP0159383A1/fr
Application granted granted Critical
Publication of EP0159383B1 publication Critical patent/EP0159383B1/fr
Expired 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/04—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing

Definitions

  • the invention relates to a machine for grinding toric surfaces on optical lenses, with a machine frame, a first holder and a second holder, wherein in one holder a headstock with a tool spindle carrying a pot tool and in the other holder a receiving device for the to be machined Lens is held and wherein the first holder is pivotable about a first axis, the distance from the interface of the pot tool is adjustable according to the desired radius of the base curve of the torus surface and the second holder according to the desired radius of the cross curve of the torus surface around a second axis in different Is adjustable.
  • Machines of this type are often used for the manufacture of spectacle lenses, in particular also for the so-called prescription manufacture, in which the lenses are made to order with a certain refractive power.
  • oric surfaces two radii have to be observed, namely the radius of the so-called base curve and the radius of the so-called cross curve.
  • the base curve is in machines of the above A rt by the length of the pivot arm and the cross curve determined by the inclination of the cup wheel.
  • the first holder is on a Swivel arm that cantilevers from a swivel bearing.
  • a slide can be moved relative to the swivel axis, which carries an electric motor on whose shaft the pot tool sits.
  • the second holder is displaceable in a slide guide, which is shorter than the slide, so that it can protrude relatively far beyond the guide.
  • the invention has for its object to design a machine of the type mentioned in such a way that the machine parts are supported so that no deformations dependent on the respective setting position occur which adversely affect the work result.
  • the first holder is supported on the machine frame via a cross support, the first holder being rotatable in the cross support and having a swivel arm connected to it in a rotationally fixed manner, along which a swivel arm bearing which can be displaced from a relative position to the machine frame together with the swivel arm rotatable and lockable on this swivel arm holder and a non-rotatable relative to the machine frame, but in this movable and lockable on this swivel arm bracket.
  • the swivel arm is not loaded with the weight of those parts which are connected to the swivel arm; rather, this weight is transferred to the machine frame via the cross support.
  • the swivel arm now only serves as a guide ruler that guides the first holder on the desired circular path. Bends of the swivel arm due to weight forces are thus completely avoided, so that more precise work results are achieved in comparison with machines in which high weights cause different deformations with different setting positions. Since the movements are controlled purely mechanically, the machine does not require any control effort to coordinate movements. It is therefore extremely simple.
  • the setting is made solely by moving the swivel arm bearing and by turning the second holder accordingly. Stencil sets are therefore not required.
  • the radii can be changed in arbitrarily small steps, which is advantageous compared to a machine that requires a separate template for each radius.
  • the arrangement of the swivel arm below the cross support in a housing-like machine frame is particularly expedient in terms of construction (claim 2).
  • the space below the machine is used, which must have a height that enables comfortable work anyway.
  • a locking device has the advantage that adjustment work is facilitated, since the locking device ensures without careful adjustment according to scales that the two guides, along which the pivot bearings must be moved, exactly parallel to each other.
  • the locking device can be designed differently. A particularly useful construction for this is specified in claim 4.
  • the pivot bearing is preferably moved by means of a spindle arranged in the housing (claim 5). Such a spindle can be driven both by hand and by means of an electric motor.
  • the respective position of the swivel bearing can be displayed, for example, by means of a counter which shows the revolutions of the adjusting spindle.
  • the second holder has a bearing ring resting on the machine frame and comprising the cross support.
  • the second holder is supported very stably on the machine frame.
  • the bearing rim is rotated for the purpose of setting the transverse curve, the weight loads do not change, which means that no different deformations occur with different setting positions.
  • a pot tool T 1 is shown in section.
  • the pot tool has a circular cutting edge 1 and can be driven at high speed about an axis 2.
  • a lens L 1 ie a concave-toric surface 3 is to be produced on it.
  • the lens L 1 is seated in a lens holder which is pivotable about a fixed point 4 on a circular path, so that the lens surface 3 completely passes the cutting edge 1.
  • One end position of the lens L 1 is shown with solid lines and the other end position with dashed lines.
  • the lens L 1 is shown in diametral section, so that there the B asiskurve appears as a line through the concave toric surface, the radius of which is indicated in Figure 1 with r B.
  • the radius r B is equal to the distance between points 4 and 5.
  • the transverse curve is determined by the inclination of axis 2 relative to the Y axis.
  • the larger the inclination angle ⁇ the smaller the radius of the transverse curve. If the angle ⁇ is 90 °, the radius of the transverse curve is equal to the radius of the cutting edge 1.
  • a transverse curve with an even smaller radius cannot be produced for a given cup wheel T 1 .
  • the smaller the angle ⁇ the larger the radius of the cross curve.
  • a pot tool T 2 which has a cutting edge 6, which in this case is on the inner edge of the end face of the tool.
  • the lens L 2 is held so that it is pivotable about a fixed point 4 '.
  • the radius r ' B is equal to the distance between points 4' and 5 '.
  • the radius of the transverse curve is determined by the inclination angle ⁇ 'of the axis 2' of the pot tool T 2 relative to the Y axis.
  • the machine has a machine frame 7 with a lower part 7a and an upper part 7b.
  • the machine frame 7 carries a cross support, designated overall by 8, on which a first holder 9 is arranged.
  • a second holder 10 is supported on the machine frame upper part 7b via a bearing ring 11.
  • Within the housing-like machine frame 7 there is a pivot arm bearing, generally designated 12, about which a pivot arm 13 can be rotated. The nature and the interaction of these components are described in detail below.
  • the cross support 8 has a first carriage 14, which is guided in a straight line via a roller guide on the machine frame upper part 7b.
  • a second carriage 16 is guided in a straight line by means of a roller guide 17 (see FIG. 5).
  • the guideways 15 and 17 are exactly perpendicular to each other.
  • the direction of movement of the first carriage 14 is denoted by X and the direction of movement of the second carriage 16 by Y.
  • the first carriage 14 can be driven by a motor.
  • an electric motor 18 is provided, which is designed as a geared motor and carries a sprocket 19 on its output shaft, over which a chain 20 is placed.
  • the chain 20 is guided over deflection wheels 21, 22 and with their Ends at attachment points 23 and 24 to the first carriage 14.
  • the first holder 9 is rotatably supported by means of a pin 25 located thereon, which engages in a bearing sleeve 26 located on the second carriage 16.
  • An arm 27 protrudes from the pin 25 and bears a rod 29 which can be moved by means of a handwheel 28 and on which a lens holder 30 is located.
  • the lens holder 30 is displaceable along the axis 31 for adjustment purposes.
  • the pivot arm 13 is attached. This is non-rotatable relative to the pin 25, which is shown in the drawing by the square 25a.
  • the swivel arm 13 extends symmetrically to its attachment point. The two sections are designated 13a and 13b.
  • the swivel arm bearing 12 consists of a swivel arm holder 32 and a swivel arm bearing block 33.
  • the swivel arm 13 has a dovetail cross section which engages in a groove 34 of the swivel arm holder 32, which likewise has a dovetail shaped cross section Has.
  • the bearing block 33 (see FIG. 5) has a guide groove 37 with a dovetail-shaped cross section.
  • a guide bar 38 engages in this groove, which also has a dovetail cross section.
  • the guide groove 38 is located on the machine frame lower part 7a.
  • the swivel arm holder 32 can be clamped against the swivel arm 13 and the bearing block 33 against the guide bar 38.
  • Pressure plates 39 and 40 are provided for this purpose.
  • the pressure plate 39 is located in a room 41 in within the swivel arm holder and the pressure plate 40 within a space 42 in the bearing block 33.
  • the two spaces communicate via a bore 43 which is located in the swivel arm holder 32.
  • Compressed air can be supplied to the two rooms 41 and 42 via a bore 44.
  • the possibility of compressed air supply and compressed air discharge is symbolically represented by a double arrow 45.
  • the pressure plate 39 is pressed against the swivel arm 13 and the pressure plate 40 against the guide bar 38, after which a displacement of the bearing block and the swivel arm holder is no longer possible.
  • the bearing block 33 is encompassed by a sliding part 46, for which purpose tabs 47, 48 are located on the sliding part 46.
  • the sliding part 46 contains an internal thread 49, in which an adjusting spindle 50 engages.
  • the adjusting spindle 50 is rotatable, but axially immovable in the lower machine frame. part 7a stored.
  • the adjusting spindle can be driven by means of an electric motor 51 which is coupled to the spindle via a reduction gear 52.
  • the cross support 8 can be locked in relation to the machine frame 7 by means of a locking device 53.
  • the locking device has a locking bolt 54, the front end 53a of which is conical and which can engage in a conical hole 55 on the second slide 16.
  • a pressure medium cylinder 56 to which pressure medium can be supplied via a bore 57, serves to advance the locking bolt into the locking position.
  • the possibility of supplying and removing pressure medium is symbolized by a double arrow 58.
  • a spring 59 can push the locking bolt 53 back into the release position.
  • the bearing ring 11 On the machine frame upper part 7b there is a guide collar 60 on which the bearing ring 11 is centered.
  • the bearing ring 11 has a lower surface 11a, which is supported on a supporting surface 61 on the upper part 7b of the machine frame. Between the lower surface 11a and the support surface 61 there are spaces 62 into which compressed air can be introduced, which is indicated by bores 62 'which open into these spaces.
  • a bracket 63 rises from the bearing ring 11, on which there is a guide bar 64 with a dovetail-shaped cross section.
  • a slide 65 is guided on the guide bar 64 and has guide surfaces 66a and 66b adapted to the guide bar 64.
  • the weight of the carriage is supported on support surfaces 67a, 67b of the bracket 63.
  • a grinding spindle 68 is held in the slide 65, in which a spindle shaft 69 is mounted.
  • a pulley 70 which can be driven by means of a drive belt 71 from a pulley 72 which is seated on the shaft 73 of an electric motor 74.
  • a pot tool T 1 sits at the front end of the spindle shaft 69.
  • the machine frame upper part 7b which interacts with a mark 76 on the bearing ring 11.
  • the scale 75 is divided into degrees.
  • the spindle shaft 50 is coupled to a counter 77, which indicates the number of revolutions of the adjusting spindle 70 even in small fractions of revolutions.
  • the machine works as follows. Before starting work, the machine is set according to the lens L 1 to be produced. Before the setting of point 4 (see FIG. 1), the locking bolt 53 is snapped into the bore 55 by pressurizing the pressure medium cylinder 56. The locking hole 55 is relative to the lock Gelungsbolzen 53 arranged so that the pivot arm 13 is exactly parallel to the guide bar 38 when the locking bolt is engaged. For the adjustment, the spaces 41, 42 are relieved of compressed air, so that the swivel arm holder 32 on the swivel arm 13 and the swivel arm bracket on the guide bar 38 can be moved. The displacement takes place by turning the spindle 50 by means of the electric motor 51. The distance between the axes 78 and 79 is read on the counter 7.
  • the counter can be calibrated so that it gives this distance directly in millimeters.
  • the distance is equal to the desired radius rB (see Fig. 1)
  • the drive of the spindle is stopped and the spaces 41, 42 are pressurized with compressed air.
  • the swivel arm holder 32 is clamped to the swivel arm and the bearing block 33 to the guide bar 38.
  • the position of point 4 (see Fig. 1) is thus fixed.
  • the bearing rim 11 is pivoted in accordance with the desired transverse curve of the lens surface 3, the mark 76 being aligned with the corresponding graduation on the scale 75.
  • the spaces 62 are pressurized, an air film being formed between the surfaces 11a and 61, which enables the bearing ring 11 to be rotated with low forces.
  • the compressed air is released from the spaces 62, so that the bearing ring 11 rests on the support surface 61 with a high frictional force.
  • the rod 29 is adjusted according to the lens thickness.
  • the carriage 65 is brought into the position in which the cutting edge 1 of the pot tool T 1 lies in the axis 78 (see FIG. 3).
  • the grinding spindle 68 can also be displaced along its axis in order to bring the cutting edge into the correct position even after it has worn.
  • the locking bolt 53 is pulled out of the locking bore 55 by relieving pressure in the pressure medium cylinder 56.
  • the grinding spindle 68 is started and the drive of the carriage 14 is started by switching on the electric motor 18.
  • the electric motor now pulls on the carriage 14, which performs a linear movement in the X direction.
  • the second carriage 16 moves at right angles to the first carriage 14. This is effected by the swivel arm 13 ′, which guides the pin 25 on a circular path.
  • the second carriage moves in the Y direction.
  • the coupling of the two carriages 14 and 16 to the swivel arm 13 brings about a combination of the carriage movements in the X and Y directions to form a circular path.
  • the weight of the first holder 9 is supported by the cross support on the machine frame 7b without the swivel arm 13 being loaded by weight forces.
  • the swivel arm 7 only has the task of guiding the first holder 9 on a circular path.
  • the cutting edge 1 of the pot tool T 1 cuts a toric surface into the lens L 1 .
  • the radius of the transverse curve depends on the inclination angle ⁇ of the tool and on the radius of the cutting edge 1.
  • the radius r B depends on the distance between the axes 79 and 78.
  • the axis 79 corresponds to point 4 in FIG. 1 and the axis 78 to that in FIG Fig. 1 with 80 designated point.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP84104714A 1984-04-26 1984-04-26 Machine pour meuler les surfaces toriques de lentilles optiques Expired EP0159383B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8484104714T DE3467317D1 (en) 1984-04-26 1984-04-26 Machine for grinding toric surfaces of optical lenses
EP84104714A EP0159383B1 (fr) 1984-04-26 1984-04-26 Machine pour meuler les surfaces toriques de lentilles optiques
US06/726,527 US4653233A (en) 1984-04-26 1985-04-24 Machine for grinding of toric surfaces on optic lenses
ES85542581A ES8605174A1 (es) 1984-04-26 1985-04-25 Maquina para el rectificado de superficies toricas en lentesopticas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84104714A EP0159383B1 (fr) 1984-04-26 1984-04-26 Machine pour meuler les surfaces toriques de lentilles optiques

Publications (2)

Publication Number Publication Date
EP0159383A1 true EP0159383A1 (fr) 1985-10-30
EP0159383B1 EP0159383B1 (fr) 1987-11-11

Family

ID=8191900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104714A Expired EP0159383B1 (fr) 1984-04-26 1984-04-26 Machine pour meuler les surfaces toriques de lentilles optiques

Country Status (4)

Country Link
US (1) US4653233A (fr)
EP (1) EP0159383B1 (fr)
DE (1) DE3467317D1 (fr)
ES (1) ES8605174A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992000832A1 (fr) * 1990-07-12 1992-01-23 Loh Optical Machinery, Inc. Surfaceuse commandee par ordinateur pour lentilles
CN115781424A (zh) * 2022-11-17 2023-03-14 苏州三环科技有限公司 一种陶瓷劈刀外半径研磨方法、系统、设备及介质

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4769953A (en) * 1986-11-20 1988-09-13 Rxtec Incorporated Lens generating system
US4768308A (en) * 1986-12-17 1988-09-06 University Of Rochester Universal lens polishing tool, polishing apparatus and method of polishing
GB8709127D0 (en) * 1987-04-15 1987-05-20 Autoflow Eng Ltd Sensing lens blank
US5007209A (en) * 1987-06-26 1991-04-16 K.K. Sankyo Seiki Seisakusho Optical fiber connector polishing apparatus and method
US4884482A (en) * 1988-11-22 1989-12-05 Citycrown, Inc. Method and apparatus for cutting an aspheric surface on a workpiece
US4947715A (en) * 1988-11-22 1990-08-14 Citycrown, Inc. Method and apparatus for cutting an aspheric surface on a workpiece
US5231587A (en) * 1990-07-12 1993-07-27 Loh Optical Machinery, Inc. Computer controlled lens surfacer
US5678967A (en) * 1995-11-21 1997-10-21 Micro Optics Design Corporation Apparatus for cutting a workpiece and including a kinematic tool coupling
US5957637A (en) * 1997-11-13 1999-09-28 Micro Optics Design Corp. Apparatus and method for generating ultimate surfaces on ophthalmic lenses
US6080044A (en) * 1998-03-26 2000-06-27 Gerber Coburn Optical, Inc. Fining/polishing machine
EP1854585B1 (fr) * 2006-05-12 2008-09-10 Satisloh GmbH Procédé et système pour produire d'une surface optique sur un objet, par exemple une lentille ophthalmique
KR20140131090A (ko) * 2013-05-03 2014-11-12 한국전자통신연구원 과수용 반사판 관리 장치 및 이를 이용한 방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252555B (de) * 1968-11-28 Coburn Manufacturing Company, Inc., Muskogee, OkIa. (V. St. A.) Einrichtung zum Erhalt gleicher Dicke bei Linsen an einer Radienfräsmaschine
US3458956A (en) * 1965-10-14 1969-08-05 Coburn Mfg Co Inc Manual-automatic lens generator
DE1752466A1 (de) * 1965-05-12 1971-09-16 Textron Inc Maschine zur Erzeugung torischer Linsenoberflaechen
DE2252498A1 (de) * 1972-10-26 1974-05-02 Loh Kg Optik W Maschine zur erzeugung von oberflaechen optischer linsen, z.b. von torischen oberflaechen
US4068413A (en) * 1975-10-02 1978-01-17 Suddarth Jack M Adjustable lens grinding apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556604A (en) * 1949-02-15 1951-06-12 Alfred G Goldberg Compound lens generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252555B (de) * 1968-11-28 Coburn Manufacturing Company, Inc., Muskogee, OkIa. (V. St. A.) Einrichtung zum Erhalt gleicher Dicke bei Linsen an einer Radienfräsmaschine
DE1752466A1 (de) * 1965-05-12 1971-09-16 Textron Inc Maschine zur Erzeugung torischer Linsenoberflaechen
US3458956A (en) * 1965-10-14 1969-08-05 Coburn Mfg Co Inc Manual-automatic lens generator
DE2252498A1 (de) * 1972-10-26 1974-05-02 Loh Kg Optik W Maschine zur erzeugung von oberflaechen optischer linsen, z.b. von torischen oberflaechen
US4068413A (en) * 1975-10-02 1978-01-17 Suddarth Jack M Adjustable lens grinding apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992000832A1 (fr) * 1990-07-12 1992-01-23 Loh Optical Machinery, Inc. Surfaceuse commandee par ordinateur pour lentilles
CN115781424A (zh) * 2022-11-17 2023-03-14 苏州三环科技有限公司 一种陶瓷劈刀外半径研磨方法、系统、设备及介质
CN115781424B (zh) * 2022-11-17 2023-08-04 苏州三环科技有限公司 一种陶瓷劈刀外半径研磨方法、系统、设备及介质

Also Published As

Publication number Publication date
DE3467317D1 (en) 1987-12-17
ES542581A0 (es) 1986-03-16
EP0159383B1 (fr) 1987-11-11
ES8605174A1 (es) 1986-03-16
US4653233A (en) 1987-03-31

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