EP0069735A1 - Improved machine for diamond turning and polishing contact lenses and the like - Google Patents
Improved machine for diamond turning and polishing contact lenses and the likeInfo
- Publication number
- EP0069735A1 EP0069735A1 EP81902285A EP81902285A EP0069735A1 EP 0069735 A1 EP0069735 A1 EP 0069735A1 EP 81902285 A EP81902285 A EP 81902285A EP 81902285 A EP81902285 A EP 81902285A EP 0069735 A1 EP0069735 A1 EP 0069735A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- machine
- spindle
- workpiece
- supported
- bearings
- 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.)
- Withdrawn
Links
- 238000005498 polishing Methods 0.000 title claims abstract description 11
- 238000007516 diamond turning Methods 0.000 title claims description 12
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000001627 detrimental effect Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/106—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with a radial air gap
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/02—Driving main working members
- B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
- B23Q5/10—Driving main working members rotary shafts, e.g. working-spindles driven essentially by electrical means
-
- 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
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
Definitions
- This invention relates to an improved machine for diamond turning and polishing contact lenses and the like.
- the object of the invention is to provide a machine for diamond turning and polishing contact lenses or the like which eliminates the drawbacks above referred to and enables high quality accurate lenses to be obtained and the risk of breakage both of lenses and tools avoided, or substantially so.
- a machine for diamond turning and polishing contact lenses or the like wherein the drive from a prime mover, e.g. an electric motor, to means for rotatably supporting a uorkpiece, is effected through the intermediar of a magnetic coupling that avoids transmission of vibration of said prime mover, or mechanism assocated therewith, to said r ⁇ tatable support means.
- a prime mover e.g. an electric motor
- breakage is avoided by a predetermined torque between the two magnets of the magnetic coupling resulting in the means rotatably supporting the workpiece being stopped in the event of excessive pressure being exerted between the workpiece and a tool acting thereon.
- An advantage also resulting from this invention is that mechanical noise is significantly reduced during operation ⁇ f the machine.
- Figure 2 is a longitudinal section taken through the casing of the apparatus.
- the apparatus comprises a shaft 1 driven in both clockwise and anti-clockwise directions by a printed armature motor 2, the shaft 1 transmitting a drive to the machine spindle 7 by way of a magnetic coupling comprising inner and outer ceramic magnets 6 and 3 respectively supported by metal adaptors 5 and 4.
- the magnet 6, by way of its adaptor 5, is fixed to the drive shaft 1 and the magnet 3, by way of its adaptor 4 is fixed to the spindle 7.
- the magnets 3 and 6 are aligned in order that the magnetic force between the two will drive the spindle 7 without physical contact between the spindle 7 and the motor 2 when the latter is activated.
- the machine spindle 7 is hollow and is mounted to rotate in bearings in a casing 8, said bearings comprising self-aligning angular contact ball races 9 and 10 having spacers 11 and 12 interposed therebetween, and a self-aligning angular contact ball race 13 mounted in a sleeve 14, a spacer 15 being interposed between this latter bearing and the bearing 10.
- This assembly of bearings which ensures stability of rotation of the spindle 7, is held in position in the casing 8 by retaining rings 16 and 17 at the ends of the casing 8.
- the casing 8 is mounted on a metal bed (not shown) ensuring that the machine is very stable.
- a work piece e.g. a contact lens
- a tapered adaptor 7a fitted to or formed integral with, the front end of the machine shaft or spindle 7.
- the machine spindle is supported by a minimum total of two bearings. At least one ball race is provided at the end of the spindle adjacent the workpiece-receiving adaptor and at the end of the spindle adjacent the magnetic coupling and drive shaft. These bearings may be separated by a spacer or suitable spacing means. Suitable bearings in all embodiments include angular contact ball races which may additionally be self-aligning.
- the provision of the magnetic drive coupling above described also overcomes the problem of tool breakage that has previously been experienced with known machines because a predetermined braking torque between the two magnets 3 and 6 ensures that the spindle 7 will immediately stop if the diamond turning tool is plunged into the workpiece and excessive pressure created between the latter and the tool. With a conventional belt drive mechanism a diamond turning tool would be damaged because of the aitg ⁇ ing inertia in the spindle 7.
- the electric motor 2 is a D.C. motor as this has low vibration.
- this invention is primarily concerned with the diamond turning and polishing of contact lenses, it is to be appreciated that it can be adapted to be used for analogous purposes, such as for the diamond turning and polishing of lenses or the like for scientific apparatus such as those for cameras; optical apparatus, microscopes and the working of any non-ferrous or precious metal or plastic component parts.
Abstract
Machines de tournage et de polissage de lentilles de contact. Un inconvenient des machines connues utilisees a cet effet reside dans le fait que la vibration creee par un moteur d'entrainement, p.ex. un moteur electrique est transmise a un support entraine rotatif pour une lentille. Ceci est prejudiciable au fini de la surface de la lentille obtenue par un outil. L'inconvenient mentionne ci-dessus est elimine par la presente invention en transmettant l'entrainement d'un moteur (2) au support de lentille (7a) par un accouplement magnetique (3, 6) qui elimine le contact physique entre le support de lentille (7a) et le moteur (2).Contact lens turning and polishing machines. A disadvantage of known machines used for this purpose lies in the fact that the vibration created by a drive motor, eg an electric motor is transmitted to a rotating driven support for a lens. This is detrimental to the lens surface finish obtained by a tool. The disadvantage mentioned above is eliminated by the present invention by transmitting the drive of a motor (2) to the lens support (7a) by a magnetic coupling (3, 6) which eliminates the physical contact between the lens support lens (7a) and the motor (2).
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8031836 | 1980-10-02 | ||
GB8031836 | 1980-10-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0069735A1 true EP0069735A1 (en) | 1983-01-19 |
Family
ID=10516445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81902285A Withdrawn EP0069735A1 (en) | 1980-10-02 | 1981-08-20 | Improved machine for diamond turning and polishing contact lenses and the like |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0069735A1 (en) |
JP (1) | JPS57501616A (en) |
BE (1) | BE890149A (en) |
CA (1) | CA1176678A (en) |
IT (1) | IT1144869B (en) |
WO (1) | WO1982001149A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2594364B1 (en) * | 1986-02-18 | 1989-06-09 | Forest Line Sa | MONOBLOCK ROTARY TOOL HOLDER AND ELECTRIC MOTOR ASSEMBLY |
FR2597017B1 (en) * | 1986-04-11 | 1991-12-13 | Metrap | TURRET MACHINE TOOL HAVING A MULTIPLICITY OF FREE SPINDLES |
DE19833241C2 (en) * | 1998-07-23 | 2001-01-11 | Junker Erwin Maschf Gmbh | Grinding spindle unit with magnetic drive |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1660489A (en) * | 1926-02-27 | 1928-02-28 | Leland Gifford Co | High-speed friction drive |
GB639354A (en) * | 1948-03-11 | 1950-06-28 | Eric Norbury | Improvements relating to driving certain cutting tools such as taps |
US2705762A (en) * | 1951-04-17 | 1955-04-05 | Benjamin D Pile | Magnetic coupling assembly |
BE531130A (en) * | 1953-08-18 | |||
US3050646A (en) * | 1958-01-06 | 1962-08-21 | Phillips Petroleum Co | Magnetic coupling |
US4037496A (en) * | 1976-09-01 | 1977-07-26 | The United States Of America As Represented By The United States Energy Research And Development Administration | Combination spindle-drive system for high precision machining |
-
1981
- 1981-08-20 JP JP56502759A patent/JPS57501616A/ja active Pending
- 1981-08-20 EP EP81902285A patent/EP0069735A1/en not_active Withdrawn
- 1981-08-20 WO PCT/GB1981/000166 patent/WO1982001149A1/en not_active Application Discontinuation
- 1981-08-26 CA CA000384636A patent/CA1176678A/en not_active Expired
- 1981-08-28 BE BE0/205815A patent/BE890149A/en not_active IP Right Cessation
- 1981-09-17 IT IT68215/81A patent/IT1144869B/en active
Non-Patent Citations (1)
Title |
---|
See references of WO8201149A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1982001149A1 (en) | 1982-04-15 |
IT1144869B (en) | 1986-10-29 |
IT8168215A0 (en) | 1981-09-17 |
JPS57501616A (en) | 1982-09-09 |
BE890149A (en) | 1981-12-16 |
CA1176678A (en) | 1984-10-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19821101 |
|
AK | Designated contracting states |
Designated state(s): CH DE FR LI NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19840502 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: GIBBS, PAUL NICHOLAS |