EP0069735A1 - Machine amelioree pour le tournage du diamant et le polissage de lentilles de contact et autres - Google Patents

Machine amelioree pour le tournage du diamant et le polissage de lentilles de contact et autres

Info

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Withdrawn
Application number
EP81902285A
Other languages
German (de)
English (en)
Inventor
Paul Nicholas Gibbs
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.)
CHASE DIAMOND TOOLS Ltd
Original Assignee
CHASE DIAMOND TOOLS Ltd
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 CHASE DIAMOND TOOLS Ltd filed Critical CHASE DIAMOND TOOLS Ltd
Publication of EP0069735A1 publication Critical patent/EP0069735A1/fr
Withdrawn legal-status Critical Current

Links

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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

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).
EP81902285A 1980-10-02 1981-08-20 Machine amelioree pour le tournage du diamant et le polissage de lentilles de contact et autres Withdrawn EP0069735A1 (fr)

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 (fr) 1983-01-19

Family

ID=10516445

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81902285A Withdrawn EP0069735A1 (fr) 1980-10-02 1981-08-20 Machine amelioree pour le tournage du diamant et le polissage de lentilles de contact et autres

Country Status (6)

Country Link
EP (1) EP0069735A1 (fr)
JP (1) JPS57501616A (fr)
BE (1) BE890149A (fr)
CA (1) CA1176678A (fr)
IT (1) IT1144869B (fr)
WO (1) WO1982001149A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2594364B1 (fr) * 1986-02-18 1989-06-09 Forest Line Sa Ensemble monobloc broche rotative porte-outil et moteur electrique
FR2597017B1 (fr) * 1986-04-11 1991-12-13 Metrap Machine-outil a tourelle comportant une multiplicite de broches libres
DE19833241C2 (de) * 1998-07-23 2001-01-11 Junker Erwin Maschf Gmbh Schleifspindeleinheit mit magnetischem Antrieb

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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 (fr) * 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8201149A1 *

Also Published As

Publication number Publication date
CA1176678A (fr) 1984-10-23
WO1982001149A1 (fr) 1982-04-15
IT8168215A0 (it) 1981-09-17
BE890149A (fr) 1981-12-16
JPS57501616A (fr) 1982-09-09
IT1144869B (it) 1986-10-29

Similar Documents

Publication Publication Date Title
US5761962A (en) Shaft rotation driving apparatus for machine tool
BR9407367A (pt) Retificadora usando motor de eixo sem escova incluindo rolamentos hidrostáticos
CN1078517C (zh) 双面磨床
EP0595070A1 (fr) Ensemble de broche de meulage
EP0069735A1 (fr) Machine amelioree pour le tournage du diamant et le polissage de lentilles de contact et autres
GB2087164A (en) Magnetic couplings; machine for diamond turning and polishing contact lenses and the like
JPS6031621B2 (ja) 二軸研削盤
KR100514798B1 (ko) 압연롤용 자동 연삭기
FR2364720A1 (fr) Outil et procede permettant d'effectuer une operation de tournage
JP3493334B2 (ja) 超仕上装置
EP0095240A3 (fr) Porte-outils
EP0904863A2 (fr) Dispositif dans un laminoir pour fils
JPH052283Y2 (fr)
SU1036497A1 (ru) Устройство дл шлифовани проволоки
JPH0643347U (ja) スピンドルユニット
SU1024239A1 (ru) Устройство дл обработки сферических поверхностей деталей
JPS6243718Y2 (fr)
SU1606317A1 (ru) Узел шпиндел шлифовального станка
JPS6031872Y2 (ja) 切削工具の微少送り調整機構
SU753620A1 (ru) Шпиндель шлифовального круга
JP2632311B2 (ja) 非円形内面研削機
JP2005001047A (ja) 研削加工装置
JPS63216673A (ja) 外周回転型スピンドル
JPS62193766A (ja) 鋼線表面の自動研磨装置
JP2000326186A (ja) ベルト駆動回転付与方式硬脆材円筒形状品の研削方法

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