EP0181788B1 - Verfahren und Vorrichtung zur Stabilisierung der Schleifgeschwindigkeit des Randes von Brillengläsern auf einer mit Kopiervorrichtung ausgestatteten Maschine - Google Patents

Verfahren und Vorrichtung zur Stabilisierung der Schleifgeschwindigkeit des Randes von Brillengläsern auf einer mit Kopiervorrichtung ausgestatteten Maschine Download PDF

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Publication number
EP0181788B1
EP0181788B1 EP19850401841 EP85401841A EP0181788B1 EP 0181788 B1 EP0181788 B1 EP 0181788B1 EP 19850401841 EP19850401841 EP 19850401841 EP 85401841 A EP85401841 A EP 85401841A EP 0181788 B1 EP0181788 B1 EP 0181788B1
Authority
EP
European Patent Office
Prior art keywords
amplifier
output
input
machine
lens
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
Application number
EP19850401841
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English (en)
French (fr)
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EP0181788A1 (de
Inventor
Bernard Verdier
Jean-Pierre Langlois
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.)
Briot International SA
Original Assignee
Briot International SA
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Filing date
Publication date
Application filed by Briot International SA filed Critical Briot International SA
Publication of EP0181788A1 publication Critical patent/EP0181788A1/de
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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
    • B24B9/144—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 the spectacles being used as a template

Definitions

  • the present invention relates to the machining of spectacle lenses on the grinding machines used to cut the blanks.
  • the residence time of the various points on the periphery of the glass can vary to a large extent depending on the shape of the glass to be machined, this time being constant only in the case of a glass of circular shape.
  • the residence time decreases considerably, because this part remains only a short instant in contact with the grinding wheel, while the parts of angles of the glass remain in contact with the grinding wheel for a time which can in some cases represent up to 1/4 of the glass revolution time.
  • the invention therefore aims to provide a method and a device for stabilizing this residence time.
  • the invention also relates to a device for implementing this method, characterized in that it comprises a circuit comprising a capacitor in series with the input of an OP amplifier, a resistor in parallel between the input and the output of the amplifier, a rectifier connected to the output of said circuit, and an amplifier-subtractor, one input of which is connected to the output of the rectifier and the other input of which is connected to a circuit providing a stabilized voltage representing the speed maximum machining of the grinding machine, the output of said amplifier-subtractor being applied to a device for controlling the glass drive motor, as known per se.
  • FIGS. 1 and 2 are diagrams showing the residence time of the different points of the periphery of a square-shaped spectacle lens on an abrasive strip and on a circular grinding wheel; respectively.
  • Figure 3 is a diagram of a machine for cutting spectacle lenses comprising a device for regulating the machining speed according to the invention.
  • the machine for cutting spectacle lenses comprises a grinding wheel M, a carriage C moving around an axis A and carrying an axis 1 carrying the glass V to be cut and driven by a motor 2.
  • the machine also includes a copier designated as a whole by the reference 3 comprising a device 4 for supporting and driving a mount 5 in rotation, a feeler 6 whose head is in contact with the bottom of the bezel, this feeler being mounted on a sliding support 7 resiliently recalled and connected to a potentiometer 8, this assembly being known per se.
  • a copier designated as a whole by the reference 3 comprising a device 4 for supporting and driving a mount 5 in rotation, a feeler 6 whose head is in contact with the bottom of the bezel, this feeler being mounted on a sliding support 7 resiliently recalled and connected to a potentiometer 8, this assembly being known per se.
  • an electronic device E comprising a capacitor 9 in series with an amplifier OP 10, a resistor 11 in derivation of the amplifier 10, a rectifier 12 connected to the output of the amplifier 10, and an amplifier subtractor 13, one input of which is connected to the output of rectifier 12 and the other input of which is connected to a circuit 14 providing a stabilized reference voltage.
  • the output signal from the potentiometer 8 representing the movement of the mount 5 is applied to the circuit comprising the capacitor 9, the amplifier 10 and the resistor 11, and the output of the amplifier 10 provides the absolute value of the derivative, that is to say the speed of variation of the rays of the desired lens measured by the probe 6 on the internal periphery of the bezel of the frame.
  • This absolute value is rectified by the rectifier 12 and is applied to a first input of the amplifier-subtractor 13, the other input of which receives a stabilized voltage supplied by the circuit 14 and representative of the maximum machining speed of the machine.
  • the output signal of the amplifier 13 is then applied to a known device, not shown, for controlling the motor 2 to drive the latter and obtain stabilization of the residence time of the different points of the periphery of a spectacle lens. on the machine wheel.

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)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Claims (2)

1. Verfahren zur Stabilisierung der Aufenthaltsdauer einzelner Punkte des Randes von Brillengläser auf der Schleifscheibe (M) einer mit einer Kopievorrichtung (6, 7, 8) ausgestatteten Schleifmaschine, dadurch gekennzeichnet, daß die von der Kopiervorrichtung gelieferten und die Größe des gewünschten Radius des Glases darstellenden Signale einem elektronischen Schaltkreis (E) zugeführt werden, der den Absolutwert der Ableitung (Differentialquotient) dieser Radien liefert, daß dieses Ausgangssignal gleichgerichtet und von einem Signal abgezogen wird, das der maximalen Bearbeitungsgeschwindigkeit der Maschine entspricht und daß der das Glas in Drehung versetzende Antriebsmotor von dem so erhaltenen Differenzsignal angesteuert wird.
2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß sie mit einer Schaltungsanordnung versehen ist, die in Serie mit dem Eingang eines Verstärkers OP (10) einen Kondensator (9) parallel zu dem Verstärker einen Widerstand (11) und einen am Ausgang des Verstärkers (10) angeschlossenen Gleichrichter (12) aufweist, der 'mit dem einen Eingang eines Differenzverstärkers (13) in Verbindung steht, dessen anderer Eingang an eine stabilisierte Spannungsquelle angeschlossen ist, die die maximale Bearbeitungsgeschwindigkeit der Maschine repräsentiert, wobei das Ausgangssignal des Differenzverstärkers einer - an sich bekannten - Steuereinheit für den das Glas in Rotation versetzenden Antriebsmotor (2) zugeführt wird.
EP19850401841 1984-11-09 1985-09-23 Verfahren und Vorrichtung zur Stabilisierung der Schleifgeschwindigkeit des Randes von Brillengläsern auf einer mit Kopiervorrichtung ausgestatteten Maschine Expired EP0181788B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8417115A FR2573225B1 (fr) 1984-11-09 1984-11-09 Procede et dispositif pour stabiliser la vitesse de meulage de la peripherie des verres de lunettes sur une machine comportant une copieuse
FR8417115 1984-11-09

Publications (2)

Publication Number Publication Date
EP0181788A1 EP0181788A1 (de) 1986-05-21
EP0181788B1 true EP0181788B1 (de) 1988-03-02

Family

ID=9309439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850401841 Expired EP0181788B1 (de) 1984-11-09 1985-09-23 Verfahren und Vorrichtung zur Stabilisierung der Schleifgeschwindigkeit des Randes von Brillengläsern auf einer mit Kopiervorrichtung ausgestatteten Maschine

Country Status (4)

Country Link
EP (1) EP0181788B1 (de)
JP (1) JPS61293763A (de)
DE (1) DE3561697D1 (de)
FR (1) FR2573225B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2614690B1 (fr) * 1987-04-28 1990-11-09 Essilor Int Appareil de lecture de contour, notamment pour monture de lunettes
FR2652893B1 (fr) * 1989-10-06 1993-03-19 Essilor Int Appareil de lecture de contour, notamment pour monture de lunettes.
CN110497255B (zh) * 2019-08-30 2020-07-28 西安交通大学 一种自由曲面抛光驻留时间计算方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR519016A (fr) * 1920-06-21 1921-06-03 Standard Optical Co Machine servant à meuler les bords des verres d'optique
FR1441057A (fr) * 1965-07-08 1966-06-03 Fujitsu Ltd Machine pour le meulage d'une came commandée suivant des données numériques
JPS4915946B1 (de) * 1970-08-03 1974-04-18
DE2332001C3 (de) * 1972-06-28 1980-07-10 Robert Raymond Maurice Asselin Randschleifmaschine für Brillengläser
FR2229213A6 (en) * 1973-05-09 1974-12-06 Asselin Robert Optical lense grinder - with copying mechanism for spectacle rim
DE2712029C3 (de) * 1977-03-18 1983-04-07 Mitsubishi Jukogyo K.K., Tokyo Nockenschleifmaschine
JPS555222A (en) * 1978-06-20 1980-01-16 Toyoda Mach Works Ltd Revolving speed controller for work in cam grinder
GB2092489B (en) * 1981-02-05 1984-06-06 Hoya Lens Corp Apparatus for cutting peripheral groove on spectacle lens
JPS5845854A (ja) * 1981-09-10 1983-03-17 Nippon Kogaku Kk <Nikon> 眼鏡レンズ用玉摺機

Also Published As

Publication number Publication date
FR2573225A1 (fr) 1986-05-16
DE3561697D1 (en) 1988-04-07
EP0181788A1 (de) 1986-05-21
JPS61293763A (ja) 1986-12-24
FR2573225B1 (fr) 1987-02-06

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