EP0178376A2 - Appareil d'avance pour introduire et pousser en avant des plaques dans une machine-outil - Google Patents

Appareil d'avance pour introduire et pousser en avant des plaques dans une machine-outil Download PDF

Info

Publication number
EP0178376A2
EP0178376A2 EP85105305A EP85105305A EP0178376A2 EP 0178376 A2 EP0178376 A2 EP 0178376A2 EP 85105305 A EP85105305 A EP 85105305A EP 85105305 A EP85105305 A EP 85105305A EP 0178376 A2 EP0178376 A2 EP 0178376A2
Authority
EP
European Patent Office
Prior art keywords
feed
machine tool
guide
positioning station
guides
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.)
Granted
Application number
EP85105305A
Other languages
German (de)
English (en)
Other versions
EP0178376A3 (en
EP0178376B1 (fr
Inventor
Thomas Dipl.-Ing. Haar
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.)
Alfons Haar Maschinenbau GmbH and Co KG
Original Assignee
Alfons Haar Maschinenbau GmbH and Co KG
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 Alfons Haar Maschinenbau GmbH and Co KG filed Critical Alfons Haar Maschinenbau GmbH and Co KG
Priority to AT85105305T priority Critical patent/ATE36128T1/de
Publication of EP0178376A2 publication Critical patent/EP0178376A2/fr
Publication of EP0178376A3 publication Critical patent/EP0178376A3/de
Application granted granted Critical
Publication of EP0178376B1 publication Critical patent/EP0178376B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/003—Positioning devices
    • 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
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/445—With work-moving clamp jaw
    • 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
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/463—Work-feed element contacts and moves with work
    • Y10T83/4632—Comprises a work-moving gripper

Definitions

  • the invention relates to a feed device for inserting and feeding sheets into a machine tool, with a feed slide, which has a gripping device for gripping an edge of the sheets and which is adjustable along a first guide by means of a first feed drive, a second guide, the axis of which runs orthogonal to the axis of the first guide and along which the first guide can be adjusted by means of a second feed drive, a positioning station in which the panels are successively positioned with respect to the orthogonal axes, a transfer path between the machine tool and the positioning station and an automatic control device which controls the working strokes of the Machine tool detected and the feed drives controlled synchronously with the working strokes.
  • Such a device is known (US Pat. No. 4,382,394 or DE-GM 83 18 201). It is used to position sheets, for example made of aluminum, in a positioned position in a press that punches out a predetermined number of blanks from the sheet. For this purpose, the board is clamped in a feed device and moved between the punching tools. The movement is usually along. two orthogonal axes, because an offset division is chosen for the better material utilization.
  • the feed carriage can be moved along the first guide with the aid of a spindle drive.
  • the first guide can be moved along the second guide with the aid of a further spindle drive.
  • the feed carriage has two gripping tongs that grasp the sheet at the rear edge and advance it step by step in the machine tool.
  • This feed is coupled to the movement of the machine tool, for example a punch 1, in such a way that the adjustment takes place at a time when the tool is outside the working plane during the return stroke and the working stroke.
  • the loading carriage moves to a starting position back, in which he grasps the next sheet of metal. This sheet of metal was pushed in the correct position into the loading position by a loading carriage from a positioning station.
  • the loading device contains a loading carriage which has gripping means for gripping the sheet metal plate, the loading carriage moving under the feed device in order to bring the sheet metal plate into the loading position.
  • the loading device is designed so that the loading carriage always reaches the loading position at the same point, regardless of the size of the metal sheet and the die-cut pattern, so that the metal sheet also has a predetermined starting position.
  • the invention is therefore based on the object of providing a feed device for inputting and advancing sheets into a machine tool, in which the sheets can be processed without the machine tool being idle.
  • first guides extend between the positioning station and the machine tool and each lead a feed slide with gripping device and each have a first feed drive that both first.
  • Guides are guided by the second guide and are each adjustable by its own second feed drive, and that the control device controls the feed drives belonging to the feed slide so that the table is advanced into the first machining position in the machine tool before the machine tool after the last working stroke carries out another working stroke for the previous table.
  • a charging device is not required in the device according to the invention. While a first feed slide feeds a sheet in the machine tool, the second loading slide can fetch the next sheet from the positioning station in order to feed it into the machine tool as soon as the previous sheet has been finished, for example all blanks have been punched out. Since the feed drives for each slide naturally have to be synchronized with the movement of the machine tool, it is also easily possible, for example with the aid of suitable numerical controls, to bring the subsequent sheet metal into the first machining position after the last one Working stroke was carried out on the previous table.
  • the loading carriage can be controlled in such a way that it correctly feeds the panel from the positioning station into the first processing position after the last working stroke has ended and before the new working stroke is carried out it is provided that the control device is designed so that the feed carriage follows the board in the transfer path in synchronism with the feed movement of the preceding board in the other feed carriage. This can be done in such a way that the waiting table is moved very close to the processed table, for example at a distance of 1 mm, and the waiting table tracks all movements of the table in the machine tool, so that the alignment and the distance between the panels is always maintained.
  • the invention has four axes.
  • a special transfer device for example in the form of a loading carriage or the like, is omitted.
  • the novel construction of the device according to the invention makes it possible to eliminate any change times, ie each stroke of the machine tool is a working stroke. Compared to the known devices, this is a production achieved an increase of up to 30%.
  • the parallel first guides run in a direction that coincides with the direction in which the plates are moved out of the positioning station in the direction of the machine tool.
  • the associated first guide of the tool slide can move it out of the collision area with the sheet brought up by the other loading slide when it is moved to the positioning station.
  • a relative height adjustment as is required in the known device with regard to the feed and loading carriage, is not required.
  • the single figure shows a plan view of the highly schematic feed device according to the invention.
  • a punch 10 the upper part of which has been left out for reasons of illustration, has three punching tools, which are indicated by thick solid lines 11. They are used for punching out circular blanks 12 from a metal sheet 13 shown in dot-dash lines.
  • the punch 10 is of a known type and is not to be explained in detail. The necessary ejection device is also not shown.
  • a slide-in device 14 there is a stack of sheets which is raised step by step with the aid of a lifting device, not shown.
  • the topmost sheet of metal is inserted into the gap between the insertion rollers of a coating device 15 with the aid of a plurality of vertically adjustable suction heads.
  • the sheet of metal falls from above onto a machine table (not shown).
  • Two first stops 16, 17 and a second stop 18 are assigned to the machine table.
  • a positioning drive not shown, places the board in the positioning station against the stops 16 to 18 in order to bring it into a predetermined position with respect to predetermined X and Y coordinates.
  • Such a device is known for example from US Pat. No. 4,382,395.
  • Two relatively long guides 19, 20 extend in the Y direction, the drives not shown approximately in the middle exhibit.
  • the guides support feed carriages 23 and 24, which each have two gripping tongs 25, 26.
  • the guides extend from the positioning station to the punch 10 and somewhat beyond, as can be seen from the drawing.
  • a third guide 27 is arranged in a stationary manner and carries feed drives 28, 29 at the opposite ends.
  • the third guide 27 supports the guides 19, 20 approximately centrally for adjustment in the X direction.
  • Various drives are conceivable for adjusting the feed slides 23, 24, for example via spindles, cable pulls, belts and the like.
  • a preferably numerical control controls the individual drives and operating sequences in a completely automatic manner.
  • a sheet of metal is conveyed from the insertion device onto the work table, and the sheet of metal is moved into a predetermined one with the aid of the positioning drive and the stops 16 to 18 Starting position brought.
  • the gripping tongs 25, 26 of the loading carriage 24 have gripped a metal sheet 13 on the left edge (seen in the Y direction) and move the sheet in individual steps along the X and Y axes through the punch 10, which successively remove blanks 12 from the Cut out plate 13.
  • the carriage 23 had already moved into the positioning station in order to grip a positioned panel with its tongs 25, 26 on the right edge.
  • the position or the position of the slide 22 must be defined by the pliers 25, 26 during the reception of the board 13 in the positioning station.
  • the carriage 23 brings the picked-up sheet close to the processed sheet (middle of the three dash-dotted sheets in the drawing).
  • the feed drives are controlled so that the panel in the ready position synchronously tracks the movements of the foremost panel 13 in the punch 10.
  • the feed carriage 23 moves the picked sheet into the first processing position.
  • the drive 29 drives the feed slide 24 together with the finished sheet out of the tool area.
  • the feed carriage 24 then moves back with the 2nd guide withdrawn so that its tongs 25, 26 do not hit the new board in the positioning station; the Recording of the new board is indicated by dash-dotted lines.
  • a transmitter must be provided in order to determine their movement sequence. This can be done, for example, by detecting the crankshaft rotation of the punch 10 (Z axis).
  • the feed stroke of the table 13 in the punch 10 is derived from the crankshaft rotation. It also determines when the new sheet must be in the first processing position so that the new sheet can be punched out without an idle stroke. Since the metal sheets are precisely positioned in the positioning station and are received in a predetermined position by the feed slides 23 or 24, the distances traveled from the positioning station to the first processing position in the punch are also fixed.
  • the numerical control can therefore control every feed movement from the positioning station to the punch.
  • the new plate can initially remain in the positioning station, and the assigned feed slide can be controlled so that the correct starting time is calculated from the positioning station and the plate is moved directly into the first processing position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Press Drives And Press Lines (AREA)
  • Feeding Of Workpieces (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Turning (AREA)
  • Advancing Webs (AREA)
  • Making Paper Articles (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP85105305A 1984-10-13 1985-05-02 Appareil d'avance pour introduire et pousser en avant des plaques dans une machine-outil Expired EP0178376B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85105305T ATE36128T1 (de) 1984-10-13 1985-05-02 Vorschubvorrichtung zum eingeben und vorschieben von tafeln in eine werkzeugmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3437642 1984-10-13
DE3437642A DE3437642C2 (de) 1984-10-13 1984-10-13 Vorschubvorrichtung zum Eingeben und Vorschieben von Tafeln in eine Stanze

Publications (3)

Publication Number Publication Date
EP0178376A2 true EP0178376A2 (fr) 1986-04-23
EP0178376A3 EP0178376A3 (en) 1987-01-14
EP0178376B1 EP0178376B1 (fr) 1988-08-03

Family

ID=6247859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105305A Expired EP0178376B1 (fr) 1984-10-13 1985-05-02 Appareil d'avance pour introduire et pousser en avant des plaques dans une machine-outil

Country Status (9)

Country Link
US (1) US4691817A (fr)
EP (1) EP0178376B1 (fr)
JP (1) JPS6195728A (fr)
AT (1) ATE36128T1 (fr)
AU (1) AU574502B2 (fr)
CA (1) CA1242068A (fr)
DE (2) DE3437642C2 (fr)
DK (1) DK159532C (fr)
ES (1) ES8607074A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2611555A1 (fr) * 1987-02-27 1988-09-09 Hugon Jean Dispositif de chargement et de dechargement en pieces planes telles que des toles d'une machine-outil avec deplacement de ces pieces selon deux axes perpendiculaires
WO2003037543A2 (fr) * 2001-10-30 2003-05-08 Amcor Limited Transport de feuilles a haute vitesse sans pinces de prehension
FR2996152A1 (fr) * 2012-10-01 2014-04-04 Peugeot Citroen Automobiles Sa Dispositif pour la mise en reference d’un flan pour une presse

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5102291A (en) * 1987-05-21 1992-04-07 Hine Design Inc. Method for transporting silicon wafers
US4892455A (en) * 1987-05-21 1990-01-09 Hine Derek L Wafer alignment and transport mechanism
DE3874892T2 (de) * 1987-05-21 1993-05-06 Hine Design Inc Verfahren und einrichtung zum ausrichten von siliciumplaettchen.
US4856956A (en) * 1987-06-18 1989-08-15 Supac Systems, Inc. Container extraction and transfer mechanism for an automated storage and retrieval system
US4811640A (en) * 1988-03-14 1989-03-14 Rudy Fritsch Metal shearing machine
DE8805233U1 (de) * 1988-04-20 1988-07-07 Alfons Haar Maschinenbau GmbH & Co, 2000 Hamburg Vorrichtung zum Ausschneiden und ggf. gleichzeitigen Formen von Teilen aus Blechtafeln
US5016506A (en) * 1988-09-20 1991-05-21 Redicon Corporation Method for multidirectional sheet feeding
US4926724A (en) * 1988-09-20 1990-05-22 Redicon Corporation Method and apparatus for multidirectional sheet feeding
SE505062C2 (sv) * 1989-06-06 1997-06-16 Amada Co Ltd Sätt och anordning för in- och utmatning av arbetsstycken vid en plåtbearbetningsmaskin
US5151009A (en) * 1989-06-30 1992-09-29 Lockert Timothy L Materials stacking equipment
FR2654702B1 (fr) * 1989-11-21 1992-03-20 Dardaine Ind Sa Procede et dispositif de transfert d'opercules, couvercles ou analogues dans une machine de conditionnement sterile de recipients.
US5265170A (en) * 1990-01-11 1993-11-23 Hine Design, Inc. Devices and methods for reading identification marks on semiconductor wafers
US5235518A (en) * 1990-03-02 1993-08-10 Hashimoto Denki Co., Ltd. Veneer composer
DE4135901C2 (de) * 1991-10-31 1994-07-07 Haar Maschbau Alfons Vorschubvorrichtung an Stanzpressen
IT1251254B (it) * 1991-11-08 1995-05-05 Pluritec Italia Metodo ed apparecchiatura di carico e scarico di pezzi per una macchina utensile, particolarmante per la lavorazione di piastre di circuiti stampati.
JP3378591B2 (ja) * 1992-04-30 2003-02-17 株式会社リコー 用紙クランプ装置および用紙処理装置
US5310039A (en) * 1992-08-19 1994-05-10 Intel Corporation Apparatus for efficient transfer of electronic devices
DE4345348C2 (de) * 1993-03-24 1997-01-30 Blechbearbeitungsmaschinenwerk Umstelleinrichtung der Vereinzelungseinrichtung auf andere Blechstreifenformate
DE4345184C2 (de) * 1993-03-26 1997-04-03 Haar Maschbau Alfons Tafelanlage- und Vorschubsystem für Pressen
ES2111786T5 (es) * 1993-03-26 2000-12-16 Alfons Haar Maschb Gmbh & Co Prensa con un sistema de alimentacion de tablas y de avance.
JP3442590B2 (ja) * 1995-11-20 2003-09-02 株式会社アマダ パンチング加工機およびその加工方法
US5850342A (en) * 1996-09-24 1998-12-15 Nakamura; Kaoru Machine tool control system
DE19643232A1 (de) * 1996-10-19 1998-04-30 Rainer Naroska Engineering Gmb Stanzvorrichtung mit Zufuhreinrichtung für Blechplatten
DE19755338C2 (de) * 1997-12-15 2001-12-13 Schmalbach Lubeca Zuführvorrichtung und Zuführverfahren für plattenförmige Werkstücke
FR2778496B1 (fr) 1998-05-05 2002-04-19 Recif Sa Procede et dispositif de changement de position d'une plaque de semi-conducteur
JP2002520180A (ja) * 1998-07-14 2002-07-09 シーメンス プロダクション アンド ロジスティクス システムズ アクチエンゲゼルシャフト 工作物を自動的に加工するための装置
US6413035B1 (en) 1999-01-11 2002-07-02 Amada Company, Limited Sheet working system
DE19920241B4 (de) * 1999-05-03 2006-07-20 Gebrüder Leonhardt GmbH & Co. KG Verfahren zum streifenförmigen Verarbeiten von tafelförmigen Werkstücken
US6588815B1 (en) 1999-07-27 2003-07-08 Legendary Engineering And Fabrication, Inc. Transfer press embodying a piston-cylinder assembly to effect gripping activity
DE10202994B4 (de) * 2002-01-26 2007-10-31 Alfons Haar, Maschinenbau Gmbh & Co.Kg Verfahren zum Betreiben eines Tafelanlagesystems für Stanzpressen und Verbindungsmittel zur Durchführung des Verfahrens
FR2835337B1 (fr) * 2002-01-29 2004-08-20 Recif Sa Procede et dispositif d'identification de caracteres inscrits sur une plaque de semi-conducteur comportant au moins une marque d'orientation
JP3967648B2 (ja) * 2002-08-28 2007-08-29 株式会社新川 板状部材の搬送装置
DE102006014454B3 (de) * 2006-03-29 2007-11-08 Hoffmann, Frank Stanzvorrichtung mit Zuführeinrichtung
JP5541796B2 (ja) * 2010-10-21 2014-07-09 旭精機工業株式会社 材料搬送装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2848282A1 (de) * 1977-11-08 1979-05-10 Thomson Brandt Verfahren und vorrichtung zur herstellung perforierter bleche
US4382395A (en) * 1981-04-02 1983-05-10 Thomas Haar Loading device for a machine tool, particularly for machining panels of sheet metal or other materials
EP0123183A2 (fr) * 1983-04-23 1984-10-31 Trumpf GmbH & Co Machine d'usinage pour des pièces plates

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US1650748A (en) * 1926-12-31 1927-11-29 George P Thomas Metal-punching machine
US2723022A (en) * 1954-05-13 1955-11-08 Robert J Van Schie Metal sheet transfer device
DE1111133B (de) * 1954-07-01 1961-07-20 Beteiligungs & Patentverw Gmbh Werkstueckzufuehrvorrichtung fuer Stanzpressen oder aehnliche Werkzeugmaschinen
SE392704B (sv) * 1974-07-08 1977-04-18 Esab Hebe Ab Forfarande och anordning for stegvis forflyttning av ett flertal stora platar av olika storlek
US4058307A (en) * 1975-11-03 1977-11-15 American Screen Printing Equipment Company Feed and takeoff assembly
IT1112725B (it) * 1979-04-24 1986-01-20 Argon Service Ltd Macchina da stampa serigrafica con pinze e piano scomponibile da stampa
JPS58202218A (ja) * 1982-05-17 1983-11-25 Komatsu Ltd プレス成形品の自動積込み装置
DE3241006A1 (de) * 1982-11-06 1984-05-10 Gesellschaft für Pressen-Automation mbH, 7500 Karlsruhe Automationsgeraet zum foerdern von werkstuecken
DE8318201U1 (de) * 1983-06-23 1983-09-22 Alfons Haar, Maschinenbau GmbH & Co KG, 2000 Hamburg Lade- und Vorschubvorrichtung zum Eingeben und Vorschieben von Blechtafeln in eine Werkzeugmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2848282A1 (de) * 1977-11-08 1979-05-10 Thomson Brandt Verfahren und vorrichtung zur herstellung perforierter bleche
US4382395A (en) * 1981-04-02 1983-05-10 Thomas Haar Loading device for a machine tool, particularly for machining panels of sheet metal or other materials
EP0123183A2 (fr) * 1983-04-23 1984-10-31 Trumpf GmbH & Co Machine d'usinage pour des pièces plates

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2611555A1 (fr) * 1987-02-27 1988-09-09 Hugon Jean Dispositif de chargement et de dechargement en pieces planes telles que des toles d'une machine-outil avec deplacement de ces pieces selon deux axes perpendiculaires
WO2003037543A2 (fr) * 2001-10-30 2003-05-08 Amcor Limited Transport de feuilles a haute vitesse sans pinces de prehension
WO2003037543A3 (fr) * 2001-10-30 2003-09-18 Amcor Ltd Transport de feuilles a haute vitesse sans pinces de prehension
EA005483B1 (ru) * 2001-10-30 2005-02-24 Амкор Лимитед Высокоскоростное устройство подачи листов без клещевых захватов
US7237421B2 (en) 2001-10-30 2007-07-03 Amcor Limited High-speed sheet feeding without grip pliers
FR2996152A1 (fr) * 2012-10-01 2014-04-04 Peugeot Citroen Automobiles Sa Dispositif pour la mise en reference d’un flan pour une presse

Also Published As

Publication number Publication date
ES8607074A1 (es) 1986-06-01
ES545082A0 (es) 1986-06-01
AU574502B2 (en) 1988-07-07
US4691817A (en) 1987-09-08
EP0178376A3 (en) 1987-01-14
DK159532C (da) 1991-04-02
AU4710485A (en) 1986-04-17
EP0178376B1 (fr) 1988-08-03
DK466785A (da) 1986-04-14
JPS6195728A (ja) 1986-05-14
DK159532B (da) 1990-10-29
CA1242068A (fr) 1988-09-20
DK466785D0 (da) 1985-10-11
DE3437642A1 (de) 1986-04-17
DE3437642C2 (de) 1994-03-31
DE3564084D1 (en) 1988-09-08
ATE36128T1 (de) 1988-08-15

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