EP0581008B1 - Press installation - Google Patents

Press installation Download PDF

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Publication number
EP0581008B1
EP0581008B1 EP93109676A EP93109676A EP0581008B1 EP 0581008 B1 EP0581008 B1 EP 0581008B1 EP 93109676 A EP93109676 A EP 93109676A EP 93109676 A EP93109676 A EP 93109676A EP 0581008 B1 EP0581008 B1 EP 0581008B1
Authority
EP
European Patent Office
Prior art keywords
press
ram
pressure
rams
piston
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
EP93109676A
Other languages
German (de)
French (fr)
Other versions
EP0581008A2 (en
EP0581008A3 (en
Inventor
Wolfgang Michael
Kurt Strommer
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.)
L Schuler GmbH
Original Assignee
L Schuler 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 L Schuler GmbH filed Critical L Schuler GmbH
Priority to EP96104634A priority Critical patent/EP0722793B1/en
Publication of EP0581008A2 publication Critical patent/EP0581008A2/en
Publication of EP0581008A3 publication Critical patent/EP0581008A3/en
Application granted granted Critical
Publication of EP0581008B1 publication Critical patent/EP0581008B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B30B1/265—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks using a fluid connecting unit between drive shaft and press ram
    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/08—Dies with different parts for several steps in a process
    • 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
    • B21D43/05—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work specially adapted for multi-stage presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0029—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height
    • B30B15/0035—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height using an adjustable connection between the press drive means and the press slide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/04—Frames; Guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/065—Press rams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
    • B30B15/284—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices releasing fluid from a fluid chamber subjected to overload pressure

Description

Die Erfindung betrifft eine Pressenanlage nach dem Oberbegriff des Anspruchs 1.The invention relates to a press system according to the preamble of claim 1.

Die Bearbeitung von Blechteilen (Werkstücken) erfolgt in einer solchen Pressenanlage in mehreren Bearbeitungsschritten. Die Notwendigkeit der Verringerung von Investitions- und Betriebskosten führte zur Zusammenlegung der auf Einzelpressen in Pressenstraßen durchgeführten Bearbeitungsschritte in kompakte, mehrstufige Mehrständerpressen.Sheet metal parts (workpieces) are processed in such a press system in several processing steps. The need to reduce investment and operating costs led to the merging of the processing steps carried out on individual presses in press lines into compact, multi-stage multi-column presses.

Anhand der Figuren 1A bis 1F ist in der DE 39 05 069 die bisherige Entwicklungsrichtung von derartigen Pressenanlagen aufgezeigt.The previous development direction of such press systems is shown in FIGS. 1A to 1F in DE 39 05 069.

Aus der JP-A-60 040 700 ist eine Stufenpresse bekannt, die ein Pressengestell aus Pressenständern, einem Pressentisch, einem Kopfstück und Stößel und Antriebsmittel hierfür aufweist. Ein Hauptstößel erstreckt sich hierbei über einen Bereich mehrerer Arbeitsstufen In den Hauptstößel sind Einzelstößel als Innenstößel eingesetzt und in diesem in Richtung der Antriebsbewegung des Hauptstößels auf den Pressentisch zu und von diesem weg bewegbar. Jeder der Innenstößel ist auf die Maulweite des betreffenden Einzelwerkzeugs einstellbar und darüber hinaus durch Sicherung gegen Überlast abgesichert.A step press is known from JP-A-60 040 700, which has a press frame comprising press stands, a press table, a head piece and ram and drive means therefor. A main plunger extends over a range of several working stages. Individual plungers are used as inner plungers in the main plunger and can be moved in the direction of the drive movement of the main plunger toward and away from the press table. Each of the inner plungers can be adjusted to the jaw width of the individual tool in question and is also secured against overload by securing.

Weiterhin ist aus der GB-A-1,161,526 eine Pressenstraße bekannt mit einer Ziehpresse und beliebiger Anzahl an Folgepressen, wobei die Fressen insgesamt im Dauerlauf mit gleicher Hubzahl betrieben sind. Jede Presse weist eine unabhängig voneinander in den drei Achsen wirkende Transfereinrichtung auf Zum Umsetzen zwischen den Pressen sind weitere Transfereinrichtungen angeordnet, die mit gleicher Taktzahl wie die pressenseitigen Transfereinrichtungen, jedoch im Vorschub unabhängig von diesen bewegbar sind.Furthermore, from GB-A-1,161,526 a press line is known with a drawing press and any number of subsequent presses, the feeds being operated continuously with the same number of strokes. Each press has a transfer device acting independently of one another in the three axes. To transfer between the presses, further transfer devices are arranged which can be moved with the same number of cycles as the press-side transfer devices, but independently of the latter in advance.

Ziel der Erfindung ist es, die Investitionskosten und Betriebskosten derartiger Pressenanlagen wesentlich zu senken. Nach der Aufgabe der Erfindung soll dieses Ziel erreichbar sein durch Verringerung der Bauteile-Anzahl und durch Übernahme - Integrieren - mehrerer Funktionen in verbleibende Bauteile.The aim of the invention is to significantly reduce the investment costs and operating costs of such press systems. According to the object of the invention, this goal should be achievable by reducing the number of components and by taking over - integrating - multiple functions into remaining components.

Die erfindungsgemäße Aufgabe ist gelöst bei einer Pressenanlage nach dem Oberbegriff des Anspruchs 1 durch die diesen Anspruch kennzeichnenden Merkmale. Die gegenständlichen Merkmale der weiteren Ansprüche 2 und 3 sind Ausgestaltung nach der Erfindung.The object of the invention is achieved in a press system according to the preamble of claim 1 by the features characterizing this claim. The objective features of further claims 2 and 3 are embodiment according to the invention.

Von Vorteil hierbei ist die kompakte, kurze Pressenanlage unter Fortfall von Zwischenablagen und die Verringerung der Pressenantriebselemente.The compact, short press system with the elimination of clipboards and the reduction of the press drive elements are advantageous here.

Anhand von in der Zeichnung dargestellten Ausführungsbeispielen soll die Erfindung im folgenden näher erläutert werden.The invention will be explained in more detail below on the basis of exemplary embodiments illustrated in the drawing.

Dabei zeigen:

Fig. 1
einen Pressenaufbau in einer Hauptansicht,
Fig. 2
eine Ansicht entsprechend dem Schnittverlauf II-II in Fig. 1,
Fig. 3
eine Ansicht entsprechend dem Schnittverlauf III-III in Fig. 1 mit Blick auf Außen- und Innenstößel,
Fig. 4
eine Schnittansicht entsprechend dem Schnittverlauf IV-IV in Fig. 1 in einer zu Fig. 1 vergößerten Darstellung,
Fig. 5
eine Ausschnittdarstellung entsprechend der Ausschnittlinie V in Fig. 4 und
Fig. 6
eine weitere Anlenkanordnung von Pleuel am Stößel gemäß der Ausschnittlinie VI in Fig. 2.
Show:
Fig. 1
a press assembly in a main view,
Fig. 2
2 shows a view corresponding to the section line II-II in FIG. 1,
Fig. 3
2 shows a view corresponding to the section line III-III in FIG. 1 with a view of the outer and inner tappets,
Fig. 4
2 shows a sectional view corresponding to the section line IV-IV in FIG. 1 in an illustration enlarged to FIG. 1,
Fig. 5
a sectional view corresponding to the section line V in Fig. 4 and
Fig. 6
a further articulation of connecting rods on the tappet according to the section line VI in Fig. 2nd

Die gezeigte Pressenanlage weist ein Kopfstück 1 auf, das sich über die Arbeitsstufen 6 erstreckt. Das Kopfstück 1 ist auf Pressenständern 2 abgestützt, die über Ständerquertraversen 3 auf dem Fundament 12 aufgestellt sind. Diese Bauelemente der Pressenanlage sind vermittels Spannanker 4 verspannt. Auf den Ständerquertraversen 3 ist ein Pressentisch 5 aufgesetzt. Auf diesen ist ein Schiebetisch 11 mit eine Werkzeugunterteil 10 bzw. Satz an Werkzeugunterteilen geschoben. Im oberen Bereich der Pressenanlage ist zunächst ein Außenstößel 7 vermittels Führungen 23 in Führungen 22 (Fig. 4) an den Pressenständern 2 gelagert und über Pleuel 17 heb- und senkbar.The press system shown has a head piece 1 which extends over the working stages 6. The head piece 1 is supported on press stands 2 which are set up on the foundation 12 by means of crossbeams 3. These components of the press system are clamped by means of tension anchors 4. A press table 5 is placed on the crossbeams 3. A sliding table 11 with a lower tool part 10 or a set of lower tool parts is pushed onto this. In the upper area of the press system, an outer tappet 7 is initially mounted on the press stands 2 by means of guides 23 in guides 22 (FIG. 4) and can be raised and lowered via connecting rods 17.

Der Außenstößel 7 erstreckt sich über mehrere Arbeitsstufen 6. Der Antrieb des bzw. der Stößel erfolgt über motorbetriebene Getriebe 19, 20 in dem Kopfstück 1. Durch die Gesamt-Pressenanlage erstreckt sich eine Umsetzeinrichtung für die von Arbeitsstufe 13, 6 zu Arbeitsstufe 6 zu bewegenden Blechteile, die aus z.B. im Takt der Stößel / Pressenanlage angetriebenen Schwinghebeln 14 besteht, die an Schienen 15 angreifen, die Greifzeuge 16 tragen oder direkt an Greifzeuge tragende Mittel 16, die Saugerbalken sein können, angreifen.The outer tappet 7 extends over several work stages 6. The drive or the tappet is carried out via motor-driven gears 19, 20 in the head piece 1. Through the entire press system, a conversion device extends for those to be moved from work stage 13, 6 to work stage 6 Sheet metal parts made from e.g. in the cycle of the tappet / press system, there are rocking levers 14 which engage rails 15, which carry gripping tools 16 or which directly engage gripping tools 16, which can be suction bars.

Mit 13 ist eine den Arbeitsstufen 6 vorgeschaltete Ziehstufe beziffert mit einem Ziehstößel 36, einem Werkzeugoberteil 37 und einem Werkzeugunterteil 38. Zwischen Ziehstufe 13 und erster Bearbeitungsstufe 6 ist eine Zwischenablage 42 angeordnet, die den Abstand zwischen diesen Bearbeitungsstufen halbiert.With 13 a drawing stage upstream of the working stages 6 is numbered with a ram 36, an upper tool part 37 and a lower tool part 38. Between the drawing stage 13 and the first processing stage 6 an intermediate storage 42 is arranged, which halves the distance between these processing stages.

Die Pleuel 17 greifen in den Anlenkpunkten 18 bzw. 40, wie es in den Fign. 2 und 6 näher veranschaulicht ist, am Außenstößel 7 bzw. dem Stößel 39 an. Die Erfindung sieht hier zwei Möglichkeiten vor, wobei sich die erste Ausgestaltung auf den direkten Angriff der Pleuel 17 an dem Außenstößel 7 entsprechend Fig. 2 bezieht. Die zweite Ausgestaltung gemäß Fig. 6 sieht für jeden der z.B. vier Anlenkpunkte 40 der Pleuel 17 an dem Stößel, hier 39, eine Absicherung in Form einer Überlastsicherung 41 vor. Die Pleuel 17 sind in dem jeweiligen Anlenkpunkt 40 mit einem Druckkolben 44 verbunden. Der unterhalb des Druckkolbens 44 vorgesehene Druckraum 43 ist für den Pressenbetrieb über eine Druckleitung 33 auf eine definierte Druckhöhe eingestellt.The connecting rods 17 engage in the articulation points 18 and 40, as shown in FIGS. 2 and 6 is illustrated in more detail on the outer plunger 7 and the plunger 39 respectively. The invention provides two possibilities here, the first embodiment relating to the direct engagement of the connecting rods 17 on the outer tappet 7 according to FIG. 2. The second embodiment according to FIG. 6 provides for each of the e.g. Four articulation points 40 of the connecting rods 17 on the tappet, here 39, provide protection in the form of an overload protection 41. The connecting rods 17 are connected to a pressure piston 44 in the respective articulation point 40. The pressure chamber 43 provided below the pressure piston 44 is set to a defined pressure level for the press operation via a pressure line 33.

Aus den Fign. 1, 3 und 4 ist der Außenstößel 7 erkennbar, in den entsprechend der Anzahl an Arbeitsstufen 6, hier vier Innenstößel 8 eingesetzt sind. Die Innenstößel 8 sind vermittels Führungen 24 in dem Außenstößel 7 heb- und senkbar gelagert.From Figs. 1, 3 and 4, the outer plunger 7 can be seen, in which four inner plungers 8 are used, corresponding to the number of working stages 6. The inner plungers 8 are supported by guides 24 in the outer plunger 7 so that they can be raised and lowered.

Fig. 4 läßt erkennen, daß die Mitten der Pleuel 17 und die Mitten der auf gegenüberliegenden Seiten der Pressenanlage befindlichen Spannanker 4 auf einer gemeinsamen Linie 21 angeordnet sind zur Erzielung günstiger Belastungs- und Kraftangriffspunkte. Die Linie 21 ist eine Horizontale und verläuft quer / senkrecht zur Pressendurchlaufrichtung. Die Pressendurchlaufrichtung - Transportrichtung der Werkstücke - ist mit 35 positioniert. Entsprechend der Fign. 4 und 5 weist jeder Innenstößel 8 Konsolbleche 34 auf, auf denen je eine Spindel 32 starr befestigt ist, die in Richtung nach oben weist. Die Spindel 32 wirkt mit einem von einer motorgetriebehen Schnecke 30 drehbewegbaren Schneckenrad 31 in Art einer Muttern-Spindel-Verbindung zur Höheneinstellung des aufgelegten Werkzeugs zusammen. Auf dem Schneckenrad 31 liegt der Kolben 29 eines Druckzylinders 27 auf. Oberhalb des Kolbens 29 ist ein Druckraum 28 vorgesehen, der im Betriebszustand der Pressenanlage mit Druck über die Druckleitung 33 beaufschlagt ist.Fig. 4 shows that the centers of the connecting rods 17 and the centers of the tension anchors 4 located on opposite sides of the press system are arranged on a common line 21 in order to achieve favorable loading and force application points. Line 21 is a horizontal line and runs transversely / perpendicular to the direction of the press run. The direction of press travel - the direction of transport of the workpieces - is positioned at 35. According to FIGS. 4 and 5, each inner tappet has 8 bracket plates 34, on each of which a spindle 32 is rigidly fastened, which points in the upward direction. The spindle 32 interacts with a worm wheel 31 which can be rotated by a motor-driven worm 30 in the manner of a nut-spindle connection for adjusting the height of the tool placed on it. The piston 29 of a pressure cylinder 27 rests on the worm wheel 31. A pressure chamber 28 is provided above the piston 29 and is pressurized via the pressure line 33 in the operating state of the press system.

Die Schnecken-, Schneckenrad-, Spindellösung (30, 31, 32) ermöglicht die Einstellung der Innenstößel 8 in dem Außenstößel 7. Über diese Mittel ist somit die Höheneinstellung 26 der Werkzeuge durchführbar. Die Druckzylinder 27, Druckraum 28, Kolben 29 und Spindel 32 - Lösung ermöglicht die Absicherung der Arbeitsstufen bei Überlast als Überlastsicherung 25.The worm, worm wheel and spindle solution (30, 31, 32) enables the setting of the inner plunger 8 in the outer plunger 7. The height adjustment 26 of the tools can thus be carried out via these means. The pressure cylinder 27, pressure chamber 28, piston 29 and spindle 32 solution enable the working stages to be protected in the event of an overload as an overload protection 25.

Claims (3)

  1. Progressive press, transfer press and such like press installation or forming machine, with a press frame composed of press columns (2), press platen (5) and headpiece (1), the press parts being rigidly connected to one another by means of tension ties (4), with rams (7) for forming and with a transfer device (14, 15, 16) for the transfer movement of the workpieces between the work stages (13, 6) as well as drive means (19, 20) for the movement drive of ram (7) and transfer device (14, 15, 16), characterized by the combination of the following features:
    - a ram (7) extends over a plurality of work stages (6),
    - the ram (7) is articulated without pressure point and therefore directly at four points of articulation (18) via connecting rods (17),
    - the centres of the two points of articulation (18) of each ram side and of two tension ties (4) located opposite one another in the press frame are arranged on a common line (21) which is oriented horizontally and perpendicularly to the press passage (35),
    - in the ram (7), which is designed in the manner of an outer ram, inner rams (8) of a number corresponding to the work stages (6) are mounted vertically displaceably via guides (24),
    - arranged in each case between each of the inner rams (8) and the outer ram (7) is at least one overload protection (25) with a pressure space (28) in a pressure cylinder (27) and with a piston (29),
    - for the operation of the press installation, the pressure space (28) is pressurized with pressure via pressure conduits (33) so as to load the piston (29) and therefore the inner ram (8) vertically downwards.
  2. Press installation according to Claim 1, characterized in that each of the overload protections (25) between the outer ram (7) and each of the inner rams (8) cooperates with a die-height setting (26).
  3. Press installation according to Claim 2, characterized in that, in the pressure cylinder (27) of each overload protection (25), the piston (29) acts on a worm wheel (31) and, via the latter, on a spindle (32) rigidly fastened in the inner ram (8), a thread/nut connection being made between the spindle (32) and worm wheel (31), and in that the worm wheel (31) is adjustable in rotation via a motor-driven worm (30).
EP93109676A 1992-06-27 1993-06-17 Press installation Expired - Lifetime EP0581008B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96104634A EP0722793B1 (en) 1992-06-27 1993-06-17 Press installation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4221147 1992-06-27
DE4221147A DE4221147A1 (en) 1992-06-27 1992-06-27 Press system

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP96104634.9 Division-Into 1993-06-17
EP96104634A Division EP0722793B1 (en) 1992-06-27 1993-06-17 Press installation

Publications (3)

Publication Number Publication Date
EP0581008A2 EP0581008A2 (en) 1994-02-02
EP0581008A3 EP0581008A3 (en) 1994-05-11
EP0581008B1 true EP0581008B1 (en) 1996-11-27

Family

ID=6461972

Family Applications (2)

Application Number Title Priority Date Filing Date
EP96104634A Expired - Lifetime EP0722793B1 (en) 1992-06-27 1993-06-17 Press installation
EP93109676A Expired - Lifetime EP0581008B1 (en) 1992-06-27 1993-06-17 Press installation

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP96104634A Expired - Lifetime EP0722793B1 (en) 1992-06-27 1993-06-17 Press installation

Country Status (5)

Country Link
US (1) US5375513A (en)
EP (2) EP0722793B1 (en)
CZ (1) CZ282708B6 (en)
DE (3) DE4221147A1 (en)
ES (2) ES2096144T3 (en)

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CN103706711B (en) * 2013-11-07 2016-05-04 华南理工大学 Platform adjusting device and the Flexible stamping production line that contains this platform adjusting device
CN104985072B (en) * 2015-05-28 2016-09-28 成都宏明双新科技股份有限公司 A kind of method simultaneously biobelt material being processed
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GB2199781B (en) * 1987-01-09 1991-09-04 Honda Motor Co Ltd Method of changing workpiece holders for press machine
US5102278A (en) * 1988-05-06 1992-04-07 Service Tool Die & Mfg. Company Press with external tooling arrangement
DE3843975C1 (en) * 1988-12-27 1990-06-13 Maschinenfabrik Mueller-Weingarten Ag, 7987 Weingarten, De
DE3905069C2 (en) * 1989-02-18 2000-10-12 Schuler Pressen Gmbh & Co Press system with several presses for processing sheet metal parts
DE4036470A1 (en) * 1990-11-15 1992-05-21 Mueller Weingarten Maschf Mechanical press overload protection system

Also Published As

Publication number Publication date
DE4221147A1 (en) 1994-01-05
US5375513A (en) 1994-12-27
EP0581008A2 (en) 1994-02-02
EP0722793B1 (en) 2002-01-23
EP0722793A3 (en) 1997-03-19
ES2169772T3 (en) 2002-07-16
EP0581008A3 (en) 1994-05-11
DE59310259D1 (en) 2002-03-14
CZ125393A3 (en) 1994-10-19
ES2096144T3 (en) 1997-03-01
CZ282708B6 (en) 1997-09-17
EP0722793A2 (en) 1996-07-24
DE59304577D1 (en) 1997-01-09

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