EP1063057B1 - Grinding wheel dressing apparatus - Google Patents

Grinding wheel dressing apparatus Download PDF

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Publication number
EP1063057B1
EP1063057B1 EP00112642A EP00112642A EP1063057B1 EP 1063057 B1 EP1063057 B1 EP 1063057B1 EP 00112642 A EP00112642 A EP 00112642A EP 00112642 A EP00112642 A EP 00112642A EP 1063057 B1 EP1063057 B1 EP 1063057B1
Authority
EP
European Patent Office
Prior art keywords
dressing
grinding
axle
carrier
spindle
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
EP00112642A
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German (de)
French (fr)
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EP1063057A3 (en
EP1063057A2 (en
Inventor
Dirk Andresen
Peter Oppelt
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.)
Blohm Maschinenbau GmbH
Original Assignee
Blohm Maschinenbau GmbH
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Filing date
Publication date
Application filed by Blohm Maschinenbau GmbH filed Critical Blohm Maschinenbau GmbH
Publication of EP1063057A2 publication Critical patent/EP1063057A2/en
Publication of EP1063057A3 publication Critical patent/EP1063057A3/en
Application granted granted Critical
Publication of EP1063057B1 publication Critical patent/EP1063057B1/en
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
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/04—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels
    • B24B53/053—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels using a rotary dressing tool
    • 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
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/003—Devices or means for dressing or conditioning abrasive surfaces using at least two conditioning tools

Definitions

  • the invention relates to a device for dressing at least two Set of grinding wheels forming grinding wheels, associated with the grinding wheels, separately deliverable dressing rolls (see, e.g., U.S. Patent 3,795,238).
  • a device of the type described is using a rotating Dressing tool mainly used for dressing grinding wheels with a diameter of the order of about 200 to 500 mm in Connection with the CD dressing method (continuous dressing) or the IPD dressing process (in-process dressing), where the dressing is intermittent For example, during certain stages of the grinding process (e.g., rough dressing during work table indexing or during workpiece change, Fine dressing during finish grinding).
  • the invention is based on the object of a simplified, economically operable To create dressing device.
  • the dressing rollers are mounted on a common roller carrier, which is arranged about an axis pivoting the dressing rollers alternately delivering in one of the respective active grinding wheel associated dressing position.
  • the pivot axis of the roller carrier runs parallel to the grinding spindle axis, wherein the dressing rollers are mounted parallel to the central pivot axis offset by 1800 to each other on the roller carrier.
  • the grinding wheels are arranged coaxially on a common grinding spindle.
  • the pivot axis of the roller carrier is designed as a CNC pivot axis, wherein the pivot drive of the roller carrier is designed as NC dividing unit, so that a compact, high-precision and clearance-free unit is obtained, the high rigidity for the transmission of a high torque is suitable.
  • a stable storage and easy and quick replacement of Abrichtrollen is guaranteed according to another proposal, characterized in that the dressing rollers carrying roll mandrels are mounted on two sides in a gear housing and peelable counter bearings.
  • a common roller drive axis is passed through the Operaapparatachse (hollow shaft principle).
  • the advantages achieved by the invention consist in a significant weight savings and associated reduced sizing of the machine components.
  • the cost of the machine control can be lower being held.
  • due to the reduced grinding wheel consumption given an economic mode of operation which in turn reduces the unit cost reduces the parts to be ground.
  • a grinding head 1 consisting of two mounted on a common grinding spindle 2 Satzschleiffractionn 3, 4 is movable with its grinding spindle carrier 6 vertically on a machine column 7.
  • a dressing device 8 On the grinding spindle carrier 6, a dressing device 8 is installed, which has two dressing wheels 3 and 11 which are assigned to the set grinding wheels 3, 4 on the circumferential side and which are mounted on roller domes 12 and 13, respectively.
  • the roller mandrels 12, 13 are on the one hand drive side in a gear housing 14 and on the other hand mounted in removable or fast replaceable counter-bearings 16 and 17 respectively.
  • roller support 19 which is pivotable about a central axis common to the dressing rolls CNC axis 21 which is parallel to the grinding spindle axis 22 and to which the Abrichtrollendorne 12, 13 with the dressing rollers 9 and 11 are mounted parallel to each other and offset by 180 ° to each other and also forms a counter bearing for receiving forces in the grinding wheel cover.
  • the pivoting drive of the roller carrier 19 is designed as an NC dividing attachment 22, for example of the EA-430 type from Peter Lehmann, Switzerland, with an associated direct incremental measuring system 23.
  • a common drive shaft 24 for both dressing rollers 9, 11 is passed through the trained as a hollow shaft axis of the dividing apparatus 22 to a gear box 26, to which a drive motor 27 is flanged for the dressing rollers 9, 11.
  • 28 denotes a servomotor for the NC rotary table of the grinding machine.
  • the platform 18 of the roller carrier 19 extends horizontally without engagement of the dressing rollers 9, 11 with the associated grinding wheels 3 and 4 respectively.
  • the roller carrier 19 is pivoted about the axis 21 in a dressing position 29, in which the dressing roller 11, the currently active or with a workpiece not shown engaged grinding wheel 4 contacted, while the other grinding wheel 3 remains unaffected.
  • the roller carrier 19 assumes, in an opposite pivoting position, a dressing position 31 in which the dressing roller 9 machines the currently active grinding wheel 3, while the other dressing roller 11 is lifted off the grinding wheel 4.
  • the alternate dressing of the grinding wheels 9, 11 can also take place at intervals in an intermediate stage between two grinding cycles. In this way, unnecessary dressing is avoided and the grinding wheel consumption is reduced by a good 50 °.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Abstract

At least two grinding wheels (3,4) forming a set have separately adjustable dressing rolls (11) mounted on a common support (19). The support swivels on an axle (21) and alternately positions the dressing rolls in a trimming position. The swivel axle is parallel with the axle of the grinding spindle (2). The support with its axle parallel with the grinding spindle axle is positioned above the vertically movable grinding spindle support (6).

Description

Die Erfindung betrifft eine Vorrichtung zum Abrichten von wenigstens zwei einen Schleifscheibensatz bildenden Schleifscheiben, mit den Schleifscheiben zugeordneten, separat zustellbaren Abrichtrollen (siehe z.B. US-A-3 795 238).The invention relates to a device for dressing at least two Set of grinding wheels forming grinding wheels, associated with the grinding wheels, separately deliverable dressing rolls (see, e.g., U.S. Patent 3,795,238).

Eine Vorrichtung der eingangs bezeichneten Art wird unter Verwendung eines rotierenden Abrichtwerkzeuges vorwiegend eingesetzt zum Abrichten von Schleifscheiben mit einem Durchmesser in einer Größenordnung von etwa 200 bis 500 mm in Verbindung mit dem CD-Abrichtverfahren (continuous dressing) oder dem IPD-Abrichtverfahren (in-process-dressing), wobei das Abrichten intervallmäßig zum Beispiel während bestimmter Phasen des Schleifprozesses erfolgt ( z.B. Grobabrichten während der Werkstücktisch-Fortschaltung oder während des Werkstückwechsels, Feinabrichten während des Schlichtschleifens).A device of the type described is using a rotating Dressing tool mainly used for dressing grinding wheels with a diameter of the order of about 200 to 500 mm in Connection with the CD dressing method (continuous dressing) or the IPD dressing process (in-process dressing), where the dressing is intermittent For example, during certain stages of the grinding process (e.g., rough dressing during work table indexing or during workpiece change, Fine dressing during finish grinding).

In der Praxis eingesetzte Abrichtgeräte sind aufgrund ihrer separaten linearen Zustellachsen, den zugeordneten Achsantrieben, Meßsystemen und Gehäusen relativ aufwendig und unwirtschaftlich. In practice used dressers are due to their separate linear delivery axes, the associated axle drives, measuring systems and housings relative elaborate and uneconomical.

Der Erfindung liegt die Aufgabe zugrunde, eine vereinfachte, wirtschaftlich betreibbare Abrichtvorrichtung zu schaffen.The invention is based on the object of a simplified, economically operable To create dressing device.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Abrichtrollen an einem gemeinsamen Rollenträger gelagert sind, der um eine Achse schwenkend die Abrichtrollen wechselweise in eine der jeweils aktiven Schleifscheibe zugeordnete Abrichtposition zustellend angeordnet ist.
Gemäß zweckmäßigen Ausgestaltungen verläuft die Schwenkachse des Rollenträgers parallel zur Schleifspindelachse, wobei die Abrichtrollen parallel zur zentralen Schwenkachse um 1800 versetzt zueinander am Rollenträger gelagert sind. Vorzugsweise sind die Schleifscheiben achsgleich auf einer gemeinsamen Schleifspindel angeordnet.
Weiterhin wird vorgeschlagen, den Rollenträger mit seiner parallel zur Schleifspindelachse verlaufenden Schwenkachse über den vertikal verfahrbaren Schleifspindelträger anzuordnen.
Es ist außerdem von Vorteil, wenn die Schwenkachse des Rollenträgers als CNC-Schwenkachse ausgebildet ist, wobei der Schwenkantrieb des Rollenträgers als NC-Teilapparat ausgebildet ist, so dass eine kompakte, hochpräzise und spielfrei arbeitende Einheit erhalten wird, deren hohe Steifigkeit für die Übertragung eines hohen Drehmomentes geeignet ist.
Eine stabile Lagerung und ein leichtes und schnelles Auswechseln der Abrichtrollen ist nach einem weiteren Vorschlag dadurch gewährleistet, dass die Abrichtrollen tragende Rollendorne zweiseitig in einem Getriebegehäuse und in abziehbaren Gegenlagem gelagert sind.
Zum Zweck einer optimierten, gedrängten Bauweise ist eine gemeinsame Rollenantriebsachse durch die Teilapparatachse hindurchgeführt (Hohlwellenprinzip).This object is achieved in that the dressing rollers are mounted on a common roller carrier, which is arranged about an axis pivoting the dressing rollers alternately delivering in one of the respective active grinding wheel associated dressing position.
According to expedient embodiments, the pivot axis of the roller carrier runs parallel to the grinding spindle axis, wherein the dressing rollers are mounted parallel to the central pivot axis offset by 1800 to each other on the roller carrier. Preferably, the grinding wheels are arranged coaxially on a common grinding spindle.
Furthermore, it is proposed to arrange the roller carrier with its running parallel to the grinding spindle axis pivot axis on the vertically movable grinding spindle carrier.
It is also advantageous if the pivot axis of the roller carrier is designed as a CNC pivot axis, wherein the pivot drive of the roller carrier is designed as NC dividing unit, so that a compact, high-precision and clearance-free unit is obtained, the high rigidity for the transmission of a high torque is suitable.
A stable storage and easy and quick replacement of Abrichtrollen is guaranteed according to another proposal, characterized in that the dressing rollers carrying roll mandrels are mounted on two sides in a gear housing and peelable counter bearings.
For the purpose of an optimized, crowded design, a common roller drive axis is passed through the Teilapparatachse (hollow shaft principle).

Die mit der Erfindung erzielten Vorteile bestehen in einer deutlichen Gewichtsersparnis und damit verbundenen reduzierten Dimensionierung der Maschinenkomponenten. Zudem kann der Aufwand für die Maschinensteuerung geringer gehalten werden. Außerdem ist aufgrund des reduzierten Schleifscheibenverbrauchs eine wirtschaftliche Betriebsweise gegeben, was wiederum die Stückkosten der zu schleifenden Teile reduziert. The advantages achieved by the invention consist in a significant weight savings and associated reduced sizing of the machine components. In addition, the cost of the machine control can be lower being held. In addition, due to the reduced grinding wheel consumption given an economic mode of operation, which in turn reduces the unit cost reduces the parts to be ground.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert.The invention will be described below with reference to an embodiment shown in the drawing explained in more detail.

Hierbei zeigen:

Figur 1
eine Abrichtvorrichtung für zwei einen Schleifscheibensatz bildende Schleifscheiben und
Figuren 2 bis 4
unterschiedliche Arbeitsstellungen der Abrichtvorrichtung relativ zu den zugeordneten Schleifscheiben.
Hereby show:
FIG. 1
a dressing device for two grinding wheels forming a grinding wheel and
FIGS. 2 to 4
different working positions of the dressing device relative to the associated grinding wheels.

Ein Schleifkopf 1 bestehend aus zwei auf einer gemeinsamen Schleifspindel 2 montierten Satzschleifscheiben 3, 4 ist mit seinem Schleifspindelträger 6 vertikal an einer Maschinensäule 7 verfahrbar.
Auf dem Schleifspindelträger 6 ist ein Abrichtgerät 8 installiert, welches zwei den Satzschleifscheiben 3, 4 umfangsseitig zugeordnete Abrichtrollen 9 und 11 aufweist, die auf Rollendomen 12 bzw. 13 montiert sind. Die Rollendorne 12, 13 sind einerseits antriebsseitig in einem Getriebegehäuse 14 und andererseits in abnehmbaren bzw.schnell wechselbaren Gegenlagem 16 bzw. 17 gelagert. Alle genannten Elemente sind als kompakte Einheit an einer Plattform 18 befestigt, so dass ein Rollenträger 19 erhalten wird, der um eine für die Abrichtrollen gemeinsame zentrale CNC-Achse 21 schwenkbar ist, welche parallel zur Schleifspindelachse 22 verläuft und zu der die Abrichtrollendorne 12, 13 mit den Abrichtrollen 9 und 11 parallel und um 180° versetzt zueinander gelagert sind und die darüber hinaus eine Gegenlagerstelle zur Aufnahme von Kräften in die Schleifscheibenschutzhaube bildet.
Der Schwenkantrieb des Rollenträgers 19 ist als NC-Teilapparat 22, beispielsweise vom Typ EA-430 der Firma Peter Lehmann, Schweiz mit zugeordnetem direktem inkrementalem Meßsystem 23 ausgebildet.
Eine für beide Abrichtrollen 9, 11 gemeinsame Antriebswelle 24 ist durch die als Hohlwelle ausgebildete Achse des Teilapparats 22 zu einem Getriebekasten 26 hindurchgeführt, an den ein Antriebsmotor 27 für die Abrichtrollen 9, 11 angeflanscht ist.
Mit 28 ist ein Servomotor für den NC-Rundtisch der Schleifmaschine bezeichnet.A grinding head 1 consisting of two mounted on a common grinding spindle 2 Satzschleifscheiben 3, 4 is movable with its grinding spindle carrier 6 vertically on a machine column 7.
On the grinding spindle carrier 6, a dressing device 8 is installed, which has two dressing wheels 3 and 11 which are assigned to the set grinding wheels 3, 4 on the circumferential side and which are mounted on roller domes 12 and 13, respectively. The roller mandrels 12, 13 are on the one hand drive side in a gear housing 14 and on the other hand mounted in removable or fast replaceable counter-bearings 16 and 17 respectively. All these elements are mounted as a compact unit on a platform 18, so that a roller support 19 is obtained, which is pivotable about a central axis common to the dressing rolls CNC axis 21 which is parallel to the grinding spindle axis 22 and to which the Abrichtrollendorne 12, 13 with the dressing rollers 9 and 11 are mounted parallel to each other and offset by 180 ° to each other and also forms a counter bearing for receiving forces in the grinding wheel cover.
The pivoting drive of the roller carrier 19 is designed as an NC dividing attachment 22, for example of the EA-430 type from Peter Lehmann, Switzerland, with an associated direct incremental measuring system 23.
A common drive shaft 24 for both dressing rollers 9, 11 is passed through the trained as a hollow shaft axis of the dividing apparatus 22 to a gear box 26, to which a drive motor 27 is flanged for the dressing rollers 9, 11.
28 denotes a servomotor for the NC rotary table of the grinding machine.

In der in Figur 2 dargestellten neutralen Arbeitsstellung verläuft die Plattform 18 des Rollenträgers 19 horizontal ohne Eingriff der Abrichtrollen 9, 11 mit den zugeordneten Schleifscheiben 3 bzw. 4.
Gemäß Figur 3 ist der Rollenträger 19 um die Achse 21 in eine Abrichtposition 29 verschwenkt, in der die Abrichtrolle 11 die gerade aktive bzw. mit einem nicht dargestellten Werkstück im Eingriff befindliche Schleifscheibe 4 kontaktiert, während die andere Schleifscheibe 3 unbeaufschlagt bleibt.
Gemäß Figur 4 nimmt der Rollenträger 19 in einer entgegengesetzten Schwenkstellung eine Abrichtposition 31 ein, in der die Abrichtrolle 9 die gerade aktive Schleifscheibe 3 abrichtet, während die andere Abrichtrolle 11 von der Schleifscheibe 4 abgehoben ist.
Das wechselweise Abrichten der Schleifscheiben 9, 11 kann jeweils auch intervallmäßig in einem Zwischenstadium zwischen zwei Schleifzyklen erfolgen.
Auf diese Weise wird ein unnötiges Abrichten vermieden und der Schleifscheibenverbrauch um gut 50° reduziert.In the neutral working position shown in Figure 2, the platform 18 of the roller carrier 19 extends horizontally without engagement of the dressing rollers 9, 11 with the associated grinding wheels 3 and 4 respectively.
According to Figure 3, the roller carrier 19 is pivoted about the axis 21 in a dressing position 29, in which the dressing roller 11, the currently active or with a workpiece not shown engaged grinding wheel 4 contacted, while the other grinding wheel 3 remains unaffected.
According to FIG. 4, the roller carrier 19 assumes, in an opposite pivoting position, a dressing position 31 in which the dressing roller 9 machines the currently active grinding wheel 3, while the other dressing roller 11 is lifted off the grinding wheel 4.
The alternate dressing of the grinding wheels 9, 11 can also take place at intervals in an intermediate stage between two grinding cycles.
In this way, unnecessary dressing is avoided and the grinding wheel consumption is reduced by a good 50 °.

Claims (9)

  1. Apparatus for dressing at least two grinding wheels (3, 4) forming a grinding-wheel set, having dressing rolls (9, 11) which are assigned to the grinding wheels and can be separately advanced, characterised in that the dressing rolls (9, 11) are mounted on a common roll carrier (19) which is arranged in such a manner as to pivot about an axle (21) and to advance the dressing rolls alternately into a dressing position (29 or 31) assigned to the respectively active grinding wheel (3 or 4).
  2. Apparatus according to Claim 1, characterised in that the pivot axle (21) of the roll carrier (19) runs parallel to the axis of the grinding spindle (2).
  3. Apparatus according to Claim 1 or 2, characterised in that the dressing rolls (9, 11) are mounted on the roll carrier (19) in such a manner as to be parallel to the central pivot axle (21) and offset by 180° with respect to one another.
  4. Apparatus according to one of Claims 1 to 3, characterised in that the grinding wheels (3, 4) are arranged coaxially on a common grinding spindle (2).
  5. Apparatus according to one of Claims 1 to 4, characterised in that the roll carrier (19) is arranged in such a manner that its pivot axle (21), running parallel to the axis of the grinding spindle (2), is above the vertically movable grinding-spindle carrier (6).
  6. Apparatus according to Claim 1, characterised in that the pivot axle (21) of the roll carrier (19) is designed as a CNC pivot axle.
  7. Apparatus according to one of Claims 1 to 6, characterised in that the pivot drive of the roll carrier (19) is designed as an NC divider (22).
  8. Apparatus according to one of Claims 1 to 7, characterised in that the roll mandrels (12, 13) carrying the dressing rolls (9, 11) are mounted, on two sides, in a gear housing (14) and in removable end supports (16 and 17, respectively).
  9. Apparatus according to one of Claims 1 to 8, characterised in that a common roll drive shaft (24) is passed through the divider shaft.
EP00112642A 1999-06-26 2000-06-15 Grinding wheel dressing apparatus Expired - Lifetime EP1063057B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19929466A DE19929466A1 (en) 1999-06-26 1999-06-26 Device for dressing grinding wheels
DE19929466 1999-06-26

Publications (3)

Publication Number Publication Date
EP1063057A2 EP1063057A2 (en) 2000-12-27
EP1063057A3 EP1063057A3 (en) 2003-06-04
EP1063057B1 true EP1063057B1 (en) 2004-11-17

Family

ID=7912752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00112642A Expired - Lifetime EP1063057B1 (en) 1999-06-26 2000-06-15 Grinding wheel dressing apparatus

Country Status (4)

Country Link
EP (1) EP1063057B1 (en)
AT (1) ATE282507T1 (en)
DE (2) DE19929466A1 (en)
ES (1) ES2229994T3 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10133807A1 (en) * 2001-07-11 2003-01-30 Bosch Gmbh Robert Device and method for sharpening a tool
ATE333966T1 (en) * 2003-04-22 2006-08-15 Agathon Ag Maschf DEVICE FOR CONDITIONING A CUP-SHAPED GRINDING DISC OF A GRINDING MACHINE
CN100450718C (en) * 2007-09-30 2009-01-14 厦门大学 Cup-shape online grinding wheel trimmer with inclined angle
DE102011120449A1 (en) * 2011-12-07 2013-06-13 Gleason-Pfauter Maschinenfabrik Gmbh Method for grinding toothed workpieces and apparatus designed for this purpose
CN103831724B (en) * 2014-03-26 2015-11-11 厦门大学 Circular cross-section cup emery wheel modification device
CN105817968B (en) * 2016-06-07 2017-08-08 厦门大学 Crushing and optical element edge polisher
GB201705265D0 (en) * 2017-03-31 2017-05-17 Ncmt Ltd Method and apparatus
CN113580012B (en) * 2021-07-07 2022-12-20 泰州市诚锐精密磨具有限公司 Online finisher of centerless grinding wheel
CN117620897B (en) * 2024-01-25 2024-04-05 洛阳普瑞森精密轴承有限公司 Grinding wheel coping device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477418A (en) * 1945-06-04 1949-07-26 Sheffield Corp Grinding machine with crushdressing attachment
US3263668A (en) * 1963-10-08 1966-08-02 Jr Herry L Strauss Dressing tool for abrasive grinding wheels
JPS5140556Y2 (en) * 1971-05-31 1976-10-02
GB1553511A (en) * 1975-09-29 1979-09-26 Asaeda T Truing and dressing apparatus for grinding whells
CH663923A5 (en) * 1983-09-24 1988-01-29 Hauni Werke Koerber & Co Kg DRESSING DEVICE FOR TRAIN-CONTROLLED DRESSING OF GRINDING DISC PROFILES.
JP3318369B2 (en) * 1992-10-30 2002-08-26 エヌティエヌ株式会社 Grinding machines and wheel side dressers

Also Published As

Publication number Publication date
ATE282507T1 (en) 2004-12-15
DE19929466A1 (en) 2000-12-28
EP1063057A3 (en) 2003-06-04
DE50008642D1 (en) 2004-12-23
EP1063057A2 (en) 2000-12-27
ES2229994T3 (en) 2005-05-01

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