EP0465357B1 - Gerät zum Bearbeiten von Konturen in weichem Material und automatisches Bearbeitungsverfahren mit solchem Gerät - Google Patents

Gerät zum Bearbeiten von Konturen in weichem Material und automatisches Bearbeitungsverfahren mit solchem Gerät Download PDF

Info

Publication number
EP0465357B1
EP0465357B1 EP19910401829 EP91401829A EP0465357B1 EP 0465357 B1 EP0465357 B1 EP 0465357B1 EP 19910401829 EP19910401829 EP 19910401829 EP 91401829 A EP91401829 A EP 91401829A EP 0465357 B1 EP0465357 B1 EP 0465357B1
Authority
EP
European Patent Office
Prior art keywords
machining
tool
contour
contours
rotation speed
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
EP19910401829
Other languages
English (en)
French (fr)
Other versions
EP0465357A1 (de
Inventor
Michel Ferard
Tanguy Jouan De Kervenouel
Frédéric Sgarbi
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0465357A1 publication Critical patent/EP0465357A1/de
Application granted granted Critical
Publication of EP0465357B1 publication Critical patent/EP0465357B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
    • B24B29/005—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents using brushes
    • 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
    • B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
    • B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/16—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the load
    • 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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/30—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding plastics
    • 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
    • B24B9/002—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor for travelling workpieces
    • 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
    • B24B9/20—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 plastics

Definitions

  • the invention relates to an apparatus for machining contours of soft material such as polyurethane or other plastic materials, as well as to an automatic machining process suitable for such apparatus.
  • the primary object of the invention is therefore the provision of a tool, and more generally of an apparatus, which makes it possible to produce a machined contour of good quality on such materials, and this even if the machined contour is flexible, when for example we proceed to the removal of burrs in very fine ribs of a few tenths of a millimeter.
  • Another object of the invention is especially interesting for automatic methods and relates to the control of the position of the tool, that is to say of its depth of cut.
  • the cutting force which can provide an estimate of the desired depth of cut is indeed very low and can hardly be captured correctly. We therefore planned another system to achieve a good result.
  • the device machining according to the invention comprises a tool acting on the contour and consisting of elastic strips embedded at one end in a rotary block driven by a motor device.
  • the slats are possibly made of an elastic canvas covered with abrasive.
  • a system of non-abrasive brushes pressing on two opposite faces of the contour is used in order to maintain the burrs around the tool in a state where they lend themselves well to deburring. This avoids the folding of the burrs that the tool could cause and which would compromise its effectiveness by rejecting the burrs out of reach of the slats.
  • This system consists of two brushes carrying elastic radial elements constituting bending springs; the brushes then rotate around axes more or less parallel to the faces of the contour.
  • the motor device prefferably pneumatic and for the device to include a sensor for the speed of rotation of the tool. It is then possible to adjust the cutting depth of the tool by slaving the rotation speed to a determined value, which can be periodically recalculated as a function of the idle rotation speed and its variations over time.
  • Figures 1 and 2 are two views of the entire machining system respectively representing the tool in front view and in top view; and - Figure 3 is a flowchart showing the control mode of the device.
  • the workpiece 1 comprises a flange 2, or a rib, the edge of which is machined 3 by a deburring operation, but the tool which will now be described is also usable for other types of machining, in particular chamfering.
  • a rotary block 4 provided with lamellae 5 arranged in a radiating manner and which lie in planes through which passes the axis of rotation 7 of the tool 6.
  • the rotary block 4 is subject to a spindle 8 which drives under the action of a pneumatic motor 9.
  • the slats 5 consist of an elastic fabric, one end of which is embedded in the rotary block 4 and the other end of which rubs against the edge 3, along which it is moved. This other end is covered with an abrasive powder which is responsible for the machining.
  • a tachometer 10 fixed to the pneumatic motor 9 measures the speed of rotation of the spindle 8 and of the tool 6. Furthermore, the casing of the pneumatic motor 9 carries a console 15 extended by a beam 16 parallel to the spindle 8 and which passes near the tool 6.
  • the beam 16 carries the axes of two parallel brushes 17 and 18 provided with groups of nylon bristles 19 that the rotation of the brushes 17 and 18 rubs on the two flat and opposite faces 20 and 21 of the collar 2 and the edge 3; the axes of rotation of the brushes 17 and 18 are parallel to the faces 20 and 21.
  • the beam 16 is arranged so as to extend a little next to the flange 2.
  • the bristles 19 of the two brushes 17 and 18 have bearing surfaces which overlap or partially merge, but the brushes 17 and 18 are slightly offset axially and thus remain separate.
  • a motor 22 fixed to the console 15 drives, by a first belt 23, one of the brushes 17, and a second belt 24 interconnects the axes of the brushes 17 and 18 so that the second brush is driven.
  • the bristles 19 are bent by rubbing on the faces 20 and 21 and then straighten out thanks to their elasticity.
  • the opposing forces that the brushes 17 and 18 thus exert on the flange 2 and the edge 3 have the effect of bending the flexible burrs which would otherwise bend under the force of the tool 6 and would be difficult to eliminate.
  • Such a burr bears the reference 29. It is folded around its root (where it is connected to the collar 2) and glued against the upper edge of the collar 2 by the upper brush 17. The tool 6 then attacks it by the root and thus detaches it from the collar 2 rather than eliminating it.
  • the tool 6 is placed obliquely with respect to the surfaces of the flange 2 and only removes material from the edge which carries the burr 29, that is to say that it makes chamfering.
  • the tool 6 with blades 5 is much preferable in such a situation to a rotary brush furnished with abrasive bristles because the abrasive elastic structures must be sufficiently approached from the region to be deburred to exert a sufficient abrasion force. Hair would therefore be brought to portions of the surface of the flange 2 adjacent to the region to be deburred, which would therefore be scratched, which can be accepted for aesthetic reasons in many cases, while the lamellae 5 are curved. over their entire height.
  • the lower brush 18 is intended to raise the burr 29 if necessary, in order to put it within the reach of the upper brush 17.
  • the pneumatic motor 9 is disposed at one end of a slide 30, the other end of which is pushed back by an eccentric 31 actuated by a motor 32.
  • a return system such as a spring 35 holds the end of the slide 30 against eccentric 31; moreover, all of these parts are housed in a terminal member 33 of a robot arm which is not shown in detail and which is programmed to follow approximately the edge 3 to be machined.
  • the slide 30 is held substantially in a direction where its sliding allows it to approach or move the tool 6 away from the edge 3, and therefore to modify the cutting force; the machining passes consist in moving the end member 33 along the contour 2 while adjusting the depth of the pass by constantly sliding the slide 30.
  • a potentiometer 34 locates the displacements of the motor 32 and therefore of the eccentric 31.
  • FIG. 3 examine how the servo-control of the tool 6 takes place, but it is previously necessary to devote some considerations to the machining conditions in the technical context of the invention.
  • the tachometer 10 is connected by its output to a filtering system 40 which calculates the real speed ⁇ 1 at each instant.
  • a setpoint speed supply system 41 simultaneously supplies the setpoint speed ⁇ c to be observed.
  • a calculation system 42 collects the two speeds ⁇ 1 and ⁇ c and calculates the angular position P c of the eccentric 31 for which the real speed ⁇ 1 would become equal to the set speed and which is equal to a coefficient near to where t1 designates the instant considered, t0 the instant of the start of the measurements and A is a phase advance corrector.
  • This system has a very short reaction time.
  • the set speed ⁇ c can be chosen proportional to the no-load speed of the tool 6. As this no-load speed varies over time, in particular following variations in supply pressure, temperature or of lubrication conditions, the set speed ⁇ c must be recalculated from time to time by the set speed supply system 41. In practice, a measurement can be made each time the tool 6 is released to proceed with a new machining pass.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (8)

  1. Vorrichtung zum Bearbeiten von Konturen aus weichem Material und vor allem von biegsamen Konturen (2), umfassend ein Werkzeug (6), auf den Rand der genannten Konturen wirkend und gebildet durch elastischen Lamellen (5), eingespannt mit einem Ende in einen Drehblock (4), angetrieben durch eine Antriebseinrichtung (9), und ein elastisches System, das auf zwei entgegengesetzte Seiten (20, 21) der Kontur drückt und gebildet wird durch zwei Bürsten (17, 18), die elastische Radialelemente (19) tragen, wobei sich die Bürsten um Achsen drehen, die im wesentlichen parallel sind zu den Seiten der Kontur.
  2. Bearbeitungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Lamellen gebildet werden durch ein mit Schleifmittel bedecktes elastisches Leinen bzw. Gewebe.
  3. Bearbeitungsvorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß sie eine Einstelleinrichtung (30, 31) für die Stellung des Werkzeugs (6) in Richtung der Kontur (2) umfaßt, entsprechend den Angaben eines Aufnehmers (10) einer Größe, die repräsentativ ist für die Bearbeitungskraft.
  4. Bearbeitungsvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Aufnehmer (10) ein Aufnehmer ist, der die Rotationsgeschwindigkeit des Werkzeugs (6) mißt.
  5. Bearbeitungsvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Antriebseinrichtung pneumatisch ist.
  6. Automatisches Bearbeitungsverfahren von Konturen aus weichem Material, das eine Bearbeitungsvorrichtung nach den Ansprüchen 4 bis 5 verwendet, dadurch gekennzeichnet, daß die Bearbeitungsvorrichtung der Kontur entlang verschoben wird, wobei das Werkzeug (6) mit bestimmten bzw. festgelegten Bewegungen der Kontur angenähert und von ihr entfernt wird, indem die Rotationsgeschwindigkeit des Werkzeugs auf einen festgelegten Wert geregelt wird.
  7. Automatisches Bearbeitungsverfahren nach Anspruch 6, dadurch gekennzeichnet, daß der festgelegte Wert periodisch neu berechnet wird in Abhängigkeit von der Leerlauf-Rotationsgeschwindigkeit des Werkzeugs.
  8. Automatisches Bearbeitungsverfahren nach Anspruch 7, dadurch gekennzeichnet, daß es sich zergliedert in Arbeitsgänge, zwischen denen der festgelegte Wert neu berechnet wird, wobei anschließend jeder neue Arbeitsgang eingeleitet wird durch eine langsame Annäherung des Werkzeugs (6) an die Kontur, bis eine Abnahme der Rotationsgeschwindigkeit des Werkzeugs (6) festgestellt wird.
EP19910401829 1990-07-04 1991-07-03 Gerät zum Bearbeiten von Konturen in weichem Material und automatisches Bearbeitungsverfahren mit solchem Gerät Expired - Lifetime EP0465357B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9008472A FR2664191B1 (fr) 1990-07-04 1990-07-04 Appareil d'usinage de contours en materiau tendre et procede d'usinage automatique utilisant un tel appareil.
FR9008472 1990-07-04

Publications (2)

Publication Number Publication Date
EP0465357A1 EP0465357A1 (de) 1992-01-08
EP0465357B1 true EP0465357B1 (de) 1994-06-15

Family

ID=9398343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910401829 Expired - Lifetime EP0465357B1 (de) 1990-07-04 1991-07-03 Gerät zum Bearbeiten von Konturen in weichem Material und automatisches Bearbeitungsverfahren mit solchem Gerät

Country Status (4)

Country Link
EP (1) EP0465357B1 (de)
DE (1) DE69102500T2 (de)
ES (1) ES2056600T3 (de)
FR (1) FR2664191B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2294223B (en) * 1993-07-30 1997-05-07 Western Atlas Uk Ltd Control of 2-axis machine tool
GB9315843D0 (en) * 1993-07-30 1993-09-15 Litton Uk Ltd Improved machine tool
CN105033799A (zh) * 2015-08-05 2015-11-11 海宁联丰磁业股份有限公司 一种磁芯去毛刺装置
CN107262826B (zh) * 2017-07-21 2024-03-15 厦门理工学院 一种金刚石锯片自动开刃机
CN107225468A (zh) * 2017-08-07 2017-10-03 方佳平 一种可调节式硬质手机壳侧键孔打磨装置
CN112847103A (zh) * 2021-01-07 2021-05-28 吴平 一种避免抛光不均匀影响使用的五金机械零件抛光装置
CN114654370B (zh) * 2022-03-17 2023-04-28 漳州喜梦宝家居科技有限公司 一种平板类部件加工用磨砂抛光装置及其使用方法
CN118578231B (zh) * 2024-07-31 2024-10-01 成都斯杰化工机械有限公司 三偏心蝶阀加工装置及加工方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078905A (en) * 1976-12-03 1978-03-14 Mitsubishi Jukogyo Kabushiki Kaisha Edge-rounding method and apparatus therefor
FR2472961A1 (fr) * 1980-01-04 1981-07-10 Framatome Sa Dispositif d'ebavurage et de chanfreinage des trous d'une plaque perforee
JPS60263665A (ja) * 1984-06-08 1985-12-27 Hotani:Kk ブラシロ−ルの圧下度自動調整装置
JPS61136761A (ja) * 1984-12-04 1986-06-24 Hinode Eng Kk シ−ト状成形品のバリ取り方法
DE3542817A1 (de) * 1985-12-04 1987-06-11 Wesero Maschinenbau Gmbh Verfahren zur steuerung der zustellung einer buerstmaschine

Also Published As

Publication number Publication date
DE69102500T2 (de) 1995-02-09
FR2664191A1 (fr) 1992-01-10
EP0465357A1 (de) 1992-01-08
ES2056600T3 (es) 1994-10-01
DE69102500D1 (de) 1994-07-21
FR2664191B1 (fr) 1995-03-31

Similar Documents

Publication Publication Date Title
EP1606079B1 (de) Maschine zum schleifen von optischen linsen
CA2481887C (fr) Procede de polissage automatise de pieces mecaniques en titane ou alliage de titane
US5622526A (en) Apparatus for trueing CBN abrasive belts and grinding wheels
FR2808464A1 (fr) Machine a meuler et procede pour affuter des lames
EP0465357B1 (de) Gerät zum Bearbeiten von Konturen in weichem Material und automatisches Bearbeitungsverfahren mit solchem Gerät
WO1987001333A1 (fr) Machine de finissage de pieces moulees ou usinees
EP1175280B1 (de) Verfahren zur herstellung einer oberfläche einer ophthalmischen linse und vorrichtung zur durchführung des verfahrens
FR2648741A1 (fr) Lame de coupe et procede de decoupage de matiere en feuille
FR2651705A1 (fr) Procede pour la finition des flancs de dents de roues dentees, notamment trempees, et outil pour la mise en óoeuvre de ce procede.
EP0642399B1 (de) Schleifscheiben abrichtverfahren und vorrichtung zur anwendung desselben
FR2689794A1 (fr) Machine à usiner le bord d'un verre de lunettes.
WO2006117443A1 (fr) Procede et dispositif de travail de la peripherie d’une lentille opthalmique de lunettes
EP0820837B1 (de) Maschine zum Schleifen optischer Gläser
FR2582564A1 (fr) Dispositif de coupe a lame rotative pour le decoupage d'un materiau en feuille, comportant un dispositif d'aiguisage
EP0336838B1 (de) Polierverfahren und -vorrichtung für einen optischen Gegenstand
EP0345239A1 (de) Topfschleifscheibe und Verwendung derselben zum Schleifen und mechanischen Polieren von Glas
FR2972382A1 (fr) Machine de meulage de verres optiques et procede de meulage associe
FR2794397A1 (fr) Banc de faconnage et procede de vieillissement simule d'une dalle de pierre
EP2964423B1 (de) Vorrichtung zum schneiden einer ophthalmischen linse
FR2562456A1 (fr) Procede et dispositif de traitement de surface d'un barreau en verre.
EP0560888B1 (de) Vorrichtung zum bearbeiten und zur oberflächenbehandlung von elastischen materialien
LU83914A1 (fr) Machine-outil a rectivier,aviver ou ribler automatiquement les meules suivant un profil predetermine
FR3086194A1 (fr) Machine d'usinage de verre optique comportant au moins un fil de decoupe, et procede d'usinage d'un verre optique associe
FR2851947A1 (fr) Procede d'usinage d'une lentille ophtalmique.
EP0768147A1 (de) Schleifmaschine für Bremsscheiben

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE ES GB IT LI SE

17P Request for examination filed

Effective date: 19920611

17Q First examination report despatched

Effective date: 19930427

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE ES GB IT LI SE

REF Corresponds to:

Ref document number: 69102500

Country of ref document: DE

Date of ref document: 19940721

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940825

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2056600

Country of ref document: ES

Kind code of ref document: T3

EAL Se: european patent in force in sweden

Ref document number: 91401829.6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19960628

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960701

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19960716

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960717

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19960729

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970703

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19970704

Ref country code: ES

Free format text: LAPSE BECAUSE OF THE APPLICANT RENOUNCES

Effective date: 19970704

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970731

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970731

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970703

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980401

EUG Se: european patent has lapsed

Ref document number: 91401829.6

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20001009

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050703