EP0374587B1 - Brillenglasrandschleifmaschine - Google Patents

Brillenglasrandschleifmaschine Download PDF

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Publication number
EP0374587B1
EP0374587B1 EP89122496A EP89122496A EP0374587B1 EP 0374587 B1 EP0374587 B1 EP 0374587B1 EP 89122496 A EP89122496 A EP 89122496A EP 89122496 A EP89122496 A EP 89122496A EP 0374587 B1 EP0374587 B1 EP 0374587B1
Authority
EP
European Patent Office
Prior art keywords
spectacle lens
grinding wheel
sensing head
grinding
web
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
EP89122496A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0374587A3 (en
EP0374587A2 (de
Inventor
Lutz Dr.-Ing. Gottschald
Klaus Eickmeyer
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.)
Wernicke and Co GmbH
Original Assignee
Wernicke and Co GmbH
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 Wernicke and Co GmbH filed Critical Wernicke and Co GmbH
Publication of EP0374587A2 publication Critical patent/EP0374587A2/de
Publication of EP0374587A3 publication Critical patent/EP0374587A3/de
Application granted granted Critical
Publication of EP0374587B1 publication Critical patent/EP0374587B1/de
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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B24B47/225—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses
    • 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
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30084—Milling with regulation of operation by templet, card, or other replaceable information supply
    • Y10T409/301176—Reproducing means
    • Y10T409/301624—Duplicating means
    • Y10T409/30168—Duplicating means with means for operation without manual intervention
    • Y10T409/301904—Duplicating means with means for operation without manual intervention including tracer adapted to trigger electrical energy
    • Y10T409/30196—Duplicating means with means for operation without manual intervention including tracer adapted to trigger electrical energy to actuate electrically driven work or tool moving means

Definitions

  • the invention relates to a spectacle lens edge grinding machine of the type mentioned in the preamble of claims 1 and 2.
  • an eyeglass lens grinding machine of this type is known, which is used to grind a facet on the lens edge.
  • the inside and outside of the lens near the lens circumference is scanned by two spring-loaded pin-shaped sensors, which are constantly in direct contact with the lens and whose axial position is communicated to potentiometers, the values and data determined by these potentiometers being sent to a computer or be passed on to a data store.
  • Such a scanning device if the scanning takes place simultaneously with the grinding, causes grinding marks in the vicinity of the glass circumference caused by ground glass particles.
  • one of the sensors needs to be pulled back against spring force to create a distance between the two sensors in which the glass rim can be inserted.
  • the object of the invention is to provide an eyeglass lens grinding machine of the type mentioned, in which the data of the curve of the grinding point on the grinding wheel circumference described by the front and rear eyeglass lens edge is made possible without grinding grooves as in the above described, known machine arise.
  • the invention provides according to the characterizing features of claim 1 that the probe is formed with legs parallel to each other and to the grinding wheel plane, which are connected to one another on one or both sides of their ends with a web and are arranged at a distance from one another , which is larger than the largest width of the lens circumference, and the probe carries the contact of the legs through the front and the back of the spectacle lens, the signals of which are carried out by the computer to carry out the oscillating reciprocation of the half-waves with the spectacle lens or the grinding wheel with the probe with a constant amplitude of a minimum size corresponding to the distance between the legs and for determination the curve of the grinding point on the circumference of the grinding wheel described by the outer and inner lens rim.
  • the invention according to the characterizing features of claim 2 provides that the probe is formed with legs parallel to each other and to the grinding wheel plane, which are connected to one another on one or both sides of their ends with a web and are arranged at a distance from one another , which is larger than the largest width of the lens circumference and the probe carries the contact of the thighs through the front and the rear of the spectacle lens, the signals of which are carried out by the computer to carry out the oscillating back and forth movement of the half-waves with the spectacle lens or the Grinding wheel with the probe with an amplitude size, which is determined by the respective contact of the lens on the legs, wherein the time period of the back and forth movements of the lens or the grinding wheel between the predetermined lens plane and the reversal points of the back and forth movement is measured and for Bes the curve of the grinding point on the circumference of the grinding wheel described by the outer and inner rim of the lens is used.
  • DE-U 85 29 208 discloses in this respect an eyeglass lens edge grinding machine in which the grinding wheel is evenly worn across its width in that the eyeglass lens reciprocates across the width of the grinding wheel, the sides of which are narrow beveled contact surfaces for the front or rear Has peripheral edge of the lens.
  • a reversing gear is used, which is load-dependent and reverses the transverse movement of the spectacle lens, so that this reversal of movement always takes place at the same axial height of the grinding wheel width.
  • the reversing of the back and forth movement of the grinding wheel or the spectacle lens and arranged at a distance from the approximate grinding wheel width are arranged movably, their movement being both the desired data pulses and the reversing signals for the completion of a walk and the beginning of a course of the oscillating movement of the grinding wheel or the spectacle lens.
  • the grinding wheel S of the spectacle lens edge grinding machine is arranged in a rotationally fixed manner on the longitudinally displaceable shaft 1 and is set in rotation by this.
  • two parallel struts 3, 4 are provided on both sides of the grinding wheel on a wall of the machine housing, not shown, which merge into approximately vertical further struts 5, 6.
  • a fork-shaped probe head which bears the general reference number 7 and which consists of a web 8 and two parallel fork legs 9, 10, which in their starting position are at a distance a from the approximate width b of the grinding wheel to have.
  • the spectacle lens B is held in a known manner between two half-shafts 14, 15 of the machine and caused to rotate by this; on the half shaft 14, the template 16 is rotatably attached, which is supported on a support part 17.
  • the web 8 of the probe 7 has two short shoulders 18, 19 which end in an oblique edge 20, 21 (FIG. 2). These are each opposite a likewise oblique edge 22, 23 of the fork legs 9, 10, the two oblique edges 20, 22 and 21, 23 forming a vertical gap 24 with a triangular cross section between them.
  • a measuring strip 25 is arranged, when stretched due to the deflection of the fork legs 9, 10 in the direction of arrows P and P1 from their mutually parallel basic position, a signal via a Line 26, 27 is given to a computer and memory, not shown, which is generally known for this purpose.
  • the spectacle lens B with the two half-waves 14, 15 performs in the example shown a repetitive, uniform oscillating movement in the direction of the arrows O and O 1 in FIG. 1 then the fork-shaped probe follows this oscillating movement of the grinding wheel.
  • These axial oscillatory movements of the half-waves or the grinding wheel can be carried out with the aid of any means familiar to a person skilled in the art, e.g. B. a reversing motor with a switching claw.
  • the rotational movement of the spectacle lens B and the oscillating movement of the spectacle lens or the grinding wheel carried out at a constant speed are coordinated with one another in such a way that the oscillating movements are repeated approximately over the width of the grinding wheel after a certain angular rotational movement of the half-waves.
  • This can be done with a tachometer for the spectacle lens half-waves and the reversing motor for the half-waves or the grinding wheel.
  • the edge of the spectacle lens B touches one of the forks 9, 10 with the glass front or glass back and deflects them slightly in the direction of the arrows P and P 1.
  • the forks 9, 10, which may have a shape adapted to the grinding wheel circumference (FIG. 7), not only give the control signal for reversing the oscillating movement via the measuring strips 25, but also distance data of the contact points BB of the front or rear edge BR 1 and BR2 (Fig. 1) of the lens rim BU with the forks 9, 10 determined. From the assignment of this data to the angular values of the lens rotation, the course of the spatial curve of the glass edge edges BR1 and BR2 the front and back of the lens can be determined.
  • FIG. 4 schematically shows the path of individual points of contact BB of the lens edge BU with the grinding wheel circumference (rolled into the plane of the drawing) and thus the path of this point of contact over the approximate width b of the grinding wheel S.
  • the point of contact of the front of the spectacle lens B with the grinding wheel S initially covers the path 50 via the grinding wheel S and then, before the oscillation movement reverses to the path 52, covers the path part 51, which is shown here greatly enlarged for the sake of clarity is.
  • the back of the spectacle lens hits the fork leg 10 and deflects it from its initial position.
  • the point of contact moves BB of the spectacle lens B on the grinding wheel S via the path 54 and the further path part 55, etc.
  • the point of contact now moves via the paths 56, 58, 60, 62 and the path parts 57, 59, 61 etc.
  • the spatial curve of the front and rear lens edge can be determined and saved in various ways.
  • the distances s1 to s7 corresponding to the paths 50, 52, 54, 56, 58, 60, 62 of the lens contact point with the wheel S are kept the same and constant from a center line M which lies in the center plane of the wheel S, ie the reversal of the oscillation movement always takes place at the same height on the wheel circumference in the vicinity of the two grinding wheel edges 40, 41 (FIGS. 1, 3 and 4).
  • a control signal is sent to the computer. This records the length of time that the point of contact BB of the spectacle lens B with the grinding wheel S (Fig.
  • Another possibility of acquiring and storing the spatial curve of the edges of the edge of the spectacle lens in terms of data results from the fact that the degree of deflection of the measuring strips 25 is recorded.
  • the different path variables of the deflection of the measuring strips 25 without time conversion result in the space curve values.
  • the oscillation movement is reversed via a time relay at a time interval after the forks 9, 10 have been touched for the first time, i.e. after the first deflection impulse of the forks and after the deflection of the fork legs is complete and has ended.
  • the fork legs 9a, 10a of the probe 70 are rigidly arranged on a head web 30 which can be pivoted about a pin 31 which is connected to the forks by means of two springs 32, 33 between the sections 34, 35 and a stationary part 36 is always returned to its starting position.
  • - Fig. 7 again illustrates the preferably curvature 37 of the Forks 9, 10 in adaptation to the circumference of the grinding wheel S.
  • the space curve of the glass circumference can be determined via the time or the path of the deflection.
  • FIG. 8 shows a further embodiment of a probe 7b, the head web 30 of which is designed and arranged like the web of the embodiment according to FIG. 6 and the fork legs 9b, 10b are rigidly connected to one another by a web 70.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP89122496A 1988-12-17 1989-12-06 Brillenglasrandschleifmaschine Expired - Lifetime EP0374587B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842601A DE3842601A1 (de) 1988-12-17 1988-12-17 Brillenglasrandschleifmaschine
DE3842601 1988-12-17

Publications (3)

Publication Number Publication Date
EP0374587A2 EP0374587A2 (de) 1990-06-27
EP0374587A3 EP0374587A3 (en) 1990-12-27
EP0374587B1 true EP0374587B1 (de) 1993-04-14

Family

ID=6369453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122496A Expired - Lifetime EP0374587B1 (de) 1988-12-17 1989-12-06 Brillenglasrandschleifmaschine

Country Status (4)

Country Link
US (1) US4964239A (enrdf_load_stackoverflow)
EP (1) EP0374587B1 (enrdf_load_stackoverflow)
JP (1) JPH06104298B2 (enrdf_load_stackoverflow)
DE (2) DE3842601A1 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1234118B (it) * 1989-06-12 1992-04-29 Inzerillo Giuseppe Nordio Fran Metodo per la produzione di quadranti in vetro murrino
JP2571477B2 (ja) * 1991-06-12 1997-01-16 信越半導体株式会社 ウエーハのノッチ部面取り装置
DE4208835A1 (de) * 1992-03-19 1993-09-30 Wernicke & Co Gmbh Verfahren zum Formschleifen des Umfangs eines Brillenglases
FR2697769B1 (fr) * 1992-11-10 1995-01-13 Buchmann Optical Eng Machine automatique pour meuler et biseauter les verres ophtalmiques.
DE4320934C2 (de) * 1993-06-24 1995-04-20 Wernicke & Co Gmbh Brillenglasrandschleifmaschine
FR2711331B1 (fr) * 1993-10-19 1996-01-26 Essilor Int Machine à déborder pour verre de lunettes.
DE4417533C2 (de) * 1994-05-19 1996-03-21 Wernicke & Co Gmbh Verfahren zum CNC-gesteuerten Formschleifen der Dachfacette eines Brillenglases
DE19702287C2 (de) * 1997-01-23 1999-02-11 Wernicke & Co Gmbh Verfahren zum Ermitteln des Facettenverlaufs auf dem Rand von formzubearbeitenden Brillengläsern und zum Steuern des Formbearbeitens entsprechend dem ermittelten Facettenverlauf
DE10119662C2 (de) * 2001-04-20 2003-04-10 Loh Optikmaschinen Ag Verfahren zur Randbearbeitung von optischen Linsen
KR101511647B1 (ko) * 2014-07-17 2015-04-14 주식회사 엘티에스 회전식 렌즈 연마장치

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559431A (en) * 1949-11-25 1951-07-03 Landis Tool Co Work locating device
US2639562A (en) * 1950-02-09 1953-05-26 Landis Tool Co Precision locating device
JPS4844915B1 (enrdf_load_stackoverflow) * 1970-07-15 1973-12-27
FR2543039B1 (fr) * 1983-03-22 1985-08-09 Essilor Int Procede pour le biseautage d'une lentille ophtalmique, et machine a meuler automatique correspondante
DE8529208U1 (de) * 1985-10-15 1985-11-21 Wernicke & Co GmbH, 4000 Düsseldorf Brillenglasrandschleifmaschine
FR2611560B1 (fr) * 1987-03-05 1992-10-02 Briot Int Perfectionnements aux machines a meuler et a biseauter les verres ophtalmiques

Also Published As

Publication number Publication date
JPH02224960A (ja) 1990-09-06
EP0374587A3 (en) 1990-12-27
EP0374587A2 (de) 1990-06-27
JPH06104298B2 (ja) 1994-12-21
DE3842601A1 (de) 1990-07-05
DE58904076D1 (de) 1993-05-19
US4964239A (en) 1990-10-23
DE3842601C2 (enrdf_load_stackoverflow) 1990-10-04

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