EP0439120B1 - Transfer device in machines for the progressive forming of workpieces, in particular cross-transfer device in multistage presses - Google Patents

Transfer device in machines for the progressive forming of workpieces, in particular cross-transfer device in multistage presses Download PDF

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Publication number
EP0439120B1
EP0439120B1 EP91100760A EP91100760A EP0439120B1 EP 0439120 B1 EP0439120 B1 EP 0439120B1 EP 91100760 A EP91100760 A EP 91100760A EP 91100760 A EP91100760 A EP 91100760A EP 0439120 B1 EP0439120 B1 EP 0439120B1
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EP
European Patent Office
Prior art keywords
gripper fingers
gripper
transfer
slides
track
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EP91100760A
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German (de)
French (fr)
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EP0439120A3 (en
EP0439120A2 (en
Inventor
Werner Dipl.-Ing. Gödtner
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Gebr Hilgeland & Co GmbH
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Gebr Hilgeland & Co GmbH
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K27/00Handling devices, e.g. for feeding, aligning, discharging, Cutting-off means; Arrangement thereof
    • B21K27/02Feeding devices for rods, wire, or strips
    • B21K27/04Feeding devices for rods, wire, or strips allowing successive working steps

Definitions

  • the invention relates to a transfer device on machines for the progressive shaping of workpieces, in particular a cross conveyor device on multi-stage presses.
  • a transfer device of this type is described in German Offenlegungsschrift 35 23 323.
  • a disadvantage of the construction according to German Offenlegungsschrift 35 23 323 is the fact that the pivoting movement of the gripper fingers is rigidly predetermined as a function of the movement of the gripper fingers perpendicular to the transfer device because of the handlebar construction provided there.
  • a movement law for the gripper fingers, which is fixed in its structure, is by no means the desired optimal solution for the movement sequence of the gripper or the grippers in all applications on forming machines or multi-stage presses.
  • the gripper device described here has two two-armed levers as gripper fingers, which have a relatively high mass.
  • the additional transmission elements required mean a further increase in the moving masses, which is disadvantageous because it causes significantly lower working speeds and thus slower and more expensive production.
  • the scissor-shaped opening of the crossed gripper fingers requires a large width.
  • fast-working multi-stage presses that require a small die spacing, it is not possible or only with great effort to arrange the grippers next to one another.
  • a transfer device which has two non-crossing gripping arms, on each of which a roller is attached, which is placed against a curved plate.
  • the curved plate has the function of guiding the rollers according to its shape.
  • the supports of a gripper arm are formed by a swivel joint and an eccentric bolt.
  • an additional coupling element is required for each gripper arm, which means a complex and therefore expensive construction and additional masses to be moved. As a result, the device becomes more expensive both in terms of its manufacture and in use on the forming machine, since only significantly lower working speeds can be achieved.
  • the present invention has for its object to provide in a transfer device of the type mentioned in the possibility of optimally adapting the law of motion with simple construction and small moving masses for the gripper fingers according to individual requirements.
  • the curved tracks Due to the closed design of the curved tracks as backdrops, they can serve both as a guide and as a support element, as a result of which a simple and therefore inexpensive construction is achieved. There will be no additional moving masses required, which enables higher working speeds (shorter work cycles) and thus faster and cheaper production.
  • Claims 2 to 6 and 8 and 9 specify further advantageous or expedient refinements of the transfer device according to the invention.
  • the transfer device essentially consists of a transfer carrier 2 with gripper devices 6, 7 and 8.
  • the gripper devices 6, 7 and 8 each have gripper fingers 9, 10 or 11, 12 or 13, 14 assigned to one another in pairs on.
  • the gripper devices 6, 7 and 8 attached to the transfer carrier 2 are moved in a manner known per se - and similar to that described, for example, in German Offenlegungsschrift 35 23 323 - in the sense of arrow 52 in FIG. 1, so that the free ends of the inserts 53 to 58 fastened to the gripper fingers 9 to 14 can be moved back and forth between pick-up and discharge positions 3, 4, 5 and 59 in a manner known per se. This back and forth movement takes place in an imaginary transfer plane, designated 15 (see FIG. 2).
  • the gripper fingers 9 to 14 are via corresponding bearing holes, for. B. bearing hole 40 for the gripper fingers 10 (see FIG. 2), pivotably mounted on pivot pins 16, 17 or 18, 19 or 20, 21, which pivot pins form the first supports for the gripper fingers.
  • the pivot pins 16 to 21 are located on extensions of plungers which are under the action of compression springs, for example extension 41 on the plunger 42 with compression spring 43 (see FIG. 2).
  • the gripper fingers 9 to 14 have pins 22 to 27.
  • the pins 22 to 27 each carry one of rollers 28 to 33.
  • the rollers 28 to 33 run on slides 34a, 34b or 35a, 35b or 36a, 36b, which slides each represent the second supports for the gripper fingers 9 to 14.
  • Compression springs 37, 38 and 39 are provided between the gripper finger pairs 9, 10 and 11, 12 and 13, 14, respectively, which cause the rollers 28 to 33 of the associated gripper finger pairs always rest with sufficient pressure on the associated link 34a to 36b.
  • the guide surfaces 34a to 36b functionally parallel with respect to the running of the rollers 28 to 33 - of course with a certain, slight spacing to the roles 28 to 33 - are assigned.
  • Such guide surfaces are designated 64a, 65a, 65b, 66a and 66b in the drawing.
  • the plungers for the gripper fingers are movably guided in the direction of arrow 62 between upper and lower guide bushes, for example guide bushes 60 and 61 for the plunger 42.
  • a two-armed lever is provided as a control element for the plunger, which is pivotably mounted on the transfer carrier as shown in FIG. 2 in a manner known per se and likewise in a manner known per se via a roller from an Machine clock moving ruler 50 is controlled, as is known from the prior art.
  • the lever 44 is provided as a control element for the tappet 42, one arm 45 of which engages with its free end in a recess 46 of the tappet 42 and rests there against a pressure surface 47 against the action of the compression spring 43.
  • the other, designated 48 arm of the lever 44 has at its free end a roller 49, via which the lever 44 is controlled by the ruler 50 approximately in the direction of arrow 63a in the machine cycle.
  • the ruler 50 is located at the free end of a lever 51 (not shown), which is pivotably mounted and driven in the machine frame. This known construction enables the movement of the transfer carrier 2 to be superimposed on the gripper devices 6 to 8 in the direction of the arrow 52 with the control movements of the lever 51 in the direction of the arrow 63a.
  • pin-shaped path scanners are used instead of rollers for scanning the scenes or curves. It is possible to provide the curved tracks on the transfer girder and to provide the gripper fingers with appropriate track scanners.
  • the gripper fingers are at least up to the region of the second supports on both sides in a correspondingly fork-shaped end of the transfer carrier - in the case of the exemplary embodiment between the guide plates 63 and 64 - each to be guided in a plane parallel to the transfer plane 15.
  • the arrangement can also be such that a separate compression spring is provided for the two gripper fingers of a pair of gripper fingers, one of which Ends as in the exemplary embodiment on the gripper fingers and their other ends are supported on a stop mounted on the guide plates 63, 64, which can follow the movements of the gripper fingers in the direction of arrow 62.

Abstract

In known transfer devices, a linear driving movement for the gripper fingers has superimposed on it a swivelling movement of the gripper fingers, thereby making it possible to achieve a path of movement of the free ends of the gripper fingers which brings about a relatively rapid and wide opening of the gripper fingers and a corresponding withdrawal of the gripper from the tool concerned. The disadvantage here is the rigidly predetermined motional sequence of the gripper fingers. In order to achieve a motional sequence of the gripper fingers which is optimum for the individual requirements, the movement of the gripper fingers is controlled by cam tracks matched to the individual requirements and having track detectors. <IMAGE>

Description

Die Erfindung betrifft eine Überführungsvorrichtung an Maschinen zum fortschreitenden Formen von Werkstücken, insbesondere eine Querfördervorrichtung an Mehrstufenpressen. Eine Überführungsvorrichtung dieser Art ist in der deutschen Offenlegungsschrift 35 23 323 beschrieben.The invention relates to a transfer device on machines for the progressive shaping of workpieces, in particular a cross conveyor device on multi-stage presses. A transfer device of this type is described in German Offenlegungsschrift 35 23 323.

Der Vorteil der in der erwähnten Druckschrift gezeigten und erläuterten Konstruktion gegenüber älteren Konstruktionen von derartigen Überführungsvorrichtungen besteht darin, daß infolge der Überlagerung einer linearen Antriebsbewegung der Greiferfinger eine Bewegungsbahn der freien Enden der Greiferfinger erzielbar ist, die das gewünschte schnelle und weite Öffnen und ein gewünschtes, genügend weites Entfernen des Greifers vom betreffenden Werkzeug der Umformmaschine bewirkt.The advantage of the construction shown and explained in the mentioned publication compared to older constructions of such transfer devices is that, due to the superimposition of a linear drive movement of the gripper fingers, a movement path of the free ends of the gripper fingers can be achieved which enables the desired quick and wide opening and a desired, causes sufficient removal of the gripper from the relevant tool of the forming machine.

Nachteilig bei der Konstruktion nach der deutschen Offenlegungsschrift 35 23 323 ist die Tatsache, daß die Schwenkbewegung der Greiferfinger in Abhängigkeit von der senkrecht zur Überführungsvorrichtung erfolgenden Bewegung der Greiferfinger wegen der dort vorgesehenen Lenkerkonstruktion starr vorgegeben ist. Ein in seiner Struktur fest vorgegebenes Bewegungsgesetz für die Greiferfinger ist keineswegs in allen Anwendungsfällen an Umformmaschinen oder Mehrstufenpressen die angestrebte optimale Lösung für den Bewegungsablauf des Greifers oder der Greifer.A disadvantage of the construction according to German Offenlegungsschrift 35 23 323 is the fact that the pivoting movement of the gripper fingers is rigidly predetermined as a function of the movement of the gripper fingers perpendicular to the transfer device because of the handlebar construction provided there. A movement law for the gripper fingers, which is fixed in its structure, is by no means the desired optimal solution for the movement sequence of the gripper or the grippers in all applications on forming machines or multi-stage presses.

Aus der JP-A-54 003759 ist eine Überführungsvorrichtung mit Führungsbahnen bekannt, die einer Anpassung des Abstandes der Greiferfinger an unterschiedliche Werkstückdurchmesser dienen, nicht aber der Führung der Greiferfinger beim Greifvorgang. Die hier beschriebene Greifervorrichtung bewirkt nur eine reine Drehbewegung der Greiferfinger um die Zapfen, nicht aber die gewünschte lineare Bewegung der Greiferfinger, um den Greifer genügend weit vom Werkzeug der Umformmaschine zu entfernen.From JP-A-54 003759 a transfer device with guideways is known which allows an adjustment of the distance of the Serve gripper fingers on different workpiece diameters, but not to guide the gripper fingers during the gripping process. The gripper device described here causes only a pure rotary movement of the gripper fingers around the pins, but not the desired linear movement of the gripper fingers in order to remove the gripper sufficiently far from the tool of the forming machine.

Ferner ist es bei der aus der JP-A-54 003759 bekannten Greifervorrichtung von Nachteil, daß Langlöcher in den zusätzlich erforderlichen Getriebegliedern zur Positionierung der Greiferfinger vorgesehen sind. Eine Überführungsvorrichtung an einer Mehrstufenpresse muß die Formteile vor den Matrizen mit einer Genauigkeit von Hundertstel-Millimetern positionieren können. Durch die Langlöcher in den Getriebegliedern lassen sich die Greiferfinger in keinem Fall ausreichend genau positionieren.Furthermore, it is disadvantageous in the gripper device known from JP-A-54 003759 that elongated holes are provided in the additionally required gear members for positioning the gripper fingers. A transfer device on a multi-stage press must be able to position the molded parts in front of the dies with an accuracy of hundredths of a millimeter. Due to the elongated holes in the gear links, the gripper fingers can never be positioned with sufficient accuracy.

Die hier beschriebene Greifervorrichtung hat zwei jeweils zweiarmige Hebel als Greiferfinger, die eine relativ hohe Masse besitzen. Die zusätzlich erforderlichen Getriebeglieder bedeuten eine weitere Erhöhung der bewegten Massen, was von Nachteil ist, da dadurch wesentlich niedrigere Arbeitsgeschwindigkeiten und somit eine langsamere und teurere Produktion verursacht wird.The gripper device described here has two two-armed levers as gripper fingers, which have a relatively high mass. The additional transmission elements required mean a further increase in the moving masses, which is disadvantageous because it causes significantly lower working speeds and thus slower and more expensive production.

Aus der FR-A-1 179 823 ist eine Überführungsvorrichtung bekannt, deren Greiferfinger so angeordnet sind, daß sie sich kreuzen. Es handelt sich auch hier um zwei jeweils zweiarmige Hebel als Greiferfinger, die gemäß den oben aufgeführten Gründen höhere Arbeitsgeschwindigkeiten verhindern und somit eine schnellere und preisgünstigere Produktion nicht zulassen.From FR-A-1 179 823 a transfer device is known, the gripper fingers of which are arranged so that they cross. Here, too, there are two two-armed levers as gripper fingers, which, for the reasons stated above, prevent higher working speeds and therefore do not permit faster and cheaper production.

Außerdem wird durch das scherenförmige Öffnen der gekreuzten Greiferfinger eine große Baubreite benötigt. Bei schnell arbeitenden Mehrstufenpressen, die einen kleinen Matrizenabstand erfordern, ist es nicht oder nur mit großem Aufwand möglich, die Greifer nebeneinander anzuordnen.In addition, the scissor-shaped opening of the crossed gripper fingers requires a large width. With fast-working multi-stage presses that require a small die spacing, it is not possible or only with great effort to arrange the grippers next to one another.

Aus der DE-A-37 04 939 ist eine Überführungsvorrichtung bekannt, bei der die Führungsbahnen der geschlossenen Kulissen in den beiden Greiferfingern angeordnet sind. Dadurch bedingt ist eine wesentlich größere Bauweise der Greiferfinger. die wiederum wesentlich höhere bewegte Massen bedeutet. Die Bauweise und Masse der Greiferfinger wird um so größer, je weiter der Greifer öffnen soll. Höhere zu bewegende Massen bedeuten eine niedrigere Arbeitsgeschwindigkeit und somit eine langsamere und dadurch teurere Produktion.From DE-A-37 04 939 a transfer device is known in which the guideways of the closed scenes are arranged in the two gripper fingers. This results in a significantly larger construction of the gripper fingers. which in turn means much higher moving masses. The design and mass of the gripper fingers become larger the further the gripper is to open. Higher masses to be moved mean a lower working speed and thus a slower and therefore more expensive production.

Aus der EP-A-0 245 694 ist eine Überführungsvorrichtung bekannt, die zwei sich nicht kreuzende Greifarme aufweist, an denen jeweils eine Rolle angebracht ist, die gegen ein Kurvenblech gelegt ist. Das Kurvenblech hat die Funktion, die Rollen entsprechend seiner Formgebung zu führen. Es bildet jedoch keine zweite Abstützung für die Greiferarme. Die Abstützungen eines Greiferarmes werden durch ein Drehgelenk und einen Exzenterbolzen gebildet. Darüber hinaus ist für jeden Greiferarm ein zusätzliches Kuppelglied erforderlich, was eine aufwendige und daher teure Konstruktion sowie zusätzliche zu bewegende Massen bedeutet. Dadurch wird die Vorrichtung sowohl in ihrer Herstellung als auch im Einsatz an der Umformmaschine teurer, da nur wesentlich niedrigere Arbeitsgeschwindigkeiten erreichbar sind.From EP-A-0 245 694 a transfer device is known, which has two non-crossing gripping arms, on each of which a roller is attached, which is placed against a curved plate. The curved plate has the function of guiding the rollers according to its shape. However, it does not form a second support for the gripper arms. The supports of a gripper arm are formed by a swivel joint and an eccentric bolt. In addition, an additional coupling element is required for each gripper arm, which means a complex and therefore expensive construction and additional masses to be moved. As a result, the device becomes more expensive both in terms of its manufacture and in use on the forming machine, since only significantly lower working speeds can be achieved.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, bei einer Überführungsvorrichtung der eingangs genannten Art die Möglichkeit zu schaffen, das Bewegungsgesetz bei einfacher Konstruktion und kleinen bewegten Massen für die Greiferfinger den individuellen Erfordernissen entsprechend optimal anpassen zu können.The present invention has for its object to provide in a transfer device of the type mentioned in the possibility of optimally adapting the law of motion with simple construction and small moving masses for the gripper fingers according to individual requirements.

Diese Aufgabe wird mit den in Anspruch 1 angegebenen Merkmalen gelöst.This object is achieved with the features specified in claim 1.

Durch die geschlossene Ausbildung der Kurvenbahnen als Kulissen können sie zugleich als Führungs- und als Abstützungsorgan dienen, wodurch eine einfache und somit preisgünstige Bauweise erreicht wird. Es werden keine zusätzlichen bewegten Massen benötigt, wodurch höhere Arbeitsgeschwindigkeiten (kürzere Arbeitstakte) und somit eine schnellere und preisgünstigere Produktion ermöglicht wird.Due to the closed design of the curved tracks as backdrops, they can serve both as a guide and as a support element, as a result of which a simple and therefore inexpensive construction is achieved. There will be no additional moving masses required, which enables higher working speeds (shorter work cycles) and thus faster and cheaper production.

Ein weiterer Nachteil der Lösung nach der deutschen Offenlegungsschrift 35 23 323 besteht darin, daß die lediglich am einen Ende schwenkbar und von diesem Ende aus etwa quer zur Überführungsvorrichtung bewegbar gehaltenen, langgestreckten Greiferfinger keinerlei weitere Führungsmittel aufweisen, so daß insbesondere gewisse unkontrollierte oder unkontrollierbare Bewegungen oder Auslenkungen der Greiferfinger quer zu deren Schwenkebene möglich sind. Die hieraus resultierenden Probleme bei der Werkstückaufnahme und -abgabe können - neben einem im Hinblick auf die Art der jeweiligen Werkstücke und der zum Umformen verwendeten Werkzeuge ungeeigneten Bewegungsgesetz für die Greifer - die Leistungsfähigkeit einer Umformmaschine oder Mehrstufenpresse erheblich mindern. Deshalb ist für eine sichere Führung der Greiferfinger in der Schwenkebene zu sorgen, so daß auch bei relativ hohen Arbeitstakten an der Umformmaschine oder Mehrstufenpresse sichere und präzise Aufnahme und Abgabe der Werkstücke an den betreffenden Werkzeugen bzw. an die betreffenden Werkzeuge gewährleistet ist. Diese kann mit einer Lösung gemäß Anspruch 7 erreicht werden.Another disadvantage of the solution according to German Offenlegungsschrift 35 23 323 is that the elongated gripper fingers, which can only be pivoted at one end and can be moved from this end approximately transversely to the transfer device, have no further guide means, so that in particular certain uncontrolled or uncontrollable movements or Deflections of the gripper fingers transversely to their swivel plane are possible. The resulting problems in workpiece pick-up and delivery can - in addition to a motion law for the gripper that is unsuitable with regard to the type of workpiece and the tools used for forming - significantly reduce the performance of a forming machine or multi-stage press. It is therefore necessary to ensure that the gripper fingers are guided securely in the swivel plane, so that even with relatively high work cycles on the forming machine or multi-stage press, safe and precise pick-up and delivery of the workpieces on the relevant tools or on the relevant tools is ensured. This can be achieved with a solution according to claim 7.

In den Ansprüchen 2 bis 6 sowie 8 und 9 sind weitere vorteilhafte oder zweckmäßige Ausgestaltungen der erfindungsgemäßen Überführungsvorrichtung angegeben.Claims 2 to 6 and 8 and 9 specify further advantageous or expedient refinements of the transfer device according to the invention.

Anhand der Figuren 1 und 2 der Zeichnung wird die Erfindung im folgenden an einem Ausführungsbeispiel weiter erläutert.The invention is explained in more detail below using an exemplary embodiment with reference to FIGS. 1 and 2 of the drawing.

Es zeigen

Figur 1:
eine erfindungsgemäße Überführungsvorrichtung in der Vorderansicht, und
Figur 2:
die Überführungsvorrichtung nach Figur 1 in der Seitenansicht im Schnitt entsprechend Schnittlinie II-II in Figur 1.
Show it
Figure 1:
a transfer device according to the invention in front view, and
Figure 2:
the transfer device of Figure 1 in side view in section along section line II-II in Figure 1.

Die in der Zeichnung allgemein mit 1 bezeichnete Überführungsvorrichtung besteht im wesentlichen aus einem Überführungsträger 2 mit Greifervorrichtungen 6, 7 und 8. Die Greifervorrichtungen 6, 7 und 8 weisen jeweils einander paarweise zugeordnete Greiferfinger 9, 10 bzw. 11, 12 bzw. 13, 14 auf. Die am Überführungsträger 2 befestigten Greifervorrichtungen 6, 7 und 8 werden auf an sich bekannte Weise - und ähnlich wie beispielsweise in der deutschen Offenlegungsschrift 35 23 323 beschrieben - im Sinne des Pfeiles 52 in Figur 1 hin- und herbewegt, so daß die freien Enden der an den Greiferfingern 9 bis 14 befestigten Einsätze 53 bis 58 in an sich bekannter Weise zwischen Aufnahme- und Abgabepositionen 3, 4, 5 und 59 hin- und herbewegt werden. Diese Hin- und Herbewegung vollzieht sich in einer gedachten, mit 15 bezeichneten Überführungsebene (s. Figur 2).The transfer device, generally designated 1 in the drawing, essentially consists of a transfer carrier 2 with gripper devices 6, 7 and 8. The gripper devices 6, 7 and 8 each have gripper fingers 9, 10 or 11, 12 or 13, 14 assigned to one another in pairs on. The gripper devices 6, 7 and 8 attached to the transfer carrier 2 are moved in a manner known per se - and similar to that described, for example, in German Offenlegungsschrift 35 23 323 - in the sense of arrow 52 in FIG. 1, so that the free ends of the inserts 53 to 58 fastened to the gripper fingers 9 to 14 can be moved back and forth between pick-up and discharge positions 3, 4, 5 and 59 in a manner known per se. This back and forth movement takes place in an imaginary transfer plane, designated 15 (see FIG. 2).

Die Greiferfinger 9 bis 14 sind über entsprechende Lagerbohrungen, z. B. Lagerbohrung 40 für den Greiferfinger 10 (s. Figur 2), auf Gelenkzapfen 16, 17 bzw. 18, 19 bzw. 20, 21 schwenkbar gelagert, welche Gelenkzapfen die ersten Abstützungen für die Greiferfinger bilden. Die Gelenkzapfen 16 bis 21 befinden sich an Fortsätzen von Stößeln, die unter der Wirkung von Druckfedern stehen, so beispielsweise Fortsatz 41 am Stößel 42 mit Druckfeder 43 (s. Figur 2).The gripper fingers 9 to 14 are via corresponding bearing holes, for. B. bearing hole 40 for the gripper fingers 10 (see FIG. 2), pivotably mounted on pivot pins 16, 17 or 18, 19 or 20, 21, which pivot pins form the first supports for the gripper fingers. The pivot pins 16 to 21 are located on extensions of plungers which are under the action of compression springs, for example extension 41 on the plunger 42 with compression spring 43 (see FIG. 2).

Ferner weisen die Greiferfinger 9 bis 14 Zapfen 22 bis 27 auf. Die Zapfen 22 bis 27 tragen jeweils eine von Laufrollen 28 bis 33. Die Laufrollen 28 bis 33 laufen auf Kulissen 34a, 34b bzw. 35a, 35b bzw. 36a, 36b, welche Kulissen jeweils die zweiten Abstützungen für die Greiferfinger 9 bis 14 darstellen.Furthermore, the gripper fingers 9 to 14 have pins 22 to 27. The pins 22 to 27 each carry one of rollers 28 to 33. The rollers 28 to 33 run on slides 34a, 34b or 35a, 35b or 36a, 36b, which slides each represent the second supports for the gripper fingers 9 to 14.

Zwischen den Greiferfinger-Paaren 9, 10 bzw. 11, 12 bzw. 13, 14 sind Druckfedern 37, 38 bzw. 39 vorgesehen, die bewirken, daß die Laufrollen 28 bis 33 der zugehörigen Greiferfinger-Paare stets mit genügendem Druck an der jeweils zugehörigen Kulisse 34a bis 36b anliegen. - Im Hinblick auf einen möglichst hohen Arbeitstakt der Umformmaschine oder Mehrstufenpresse ist es aus ohne weiteres verständlichen Gründen außerdem zweckmäßig, wenn den Kulissen 34a bis 36b in bezug auf den Ablauf der Laufrollen 28 bis 33 funktionsmäßig parallel verlaufende Führungsflächen - selbstverständlich mit einem gewissen, geringfügigen Abstand zu den Rollen 28 bis 33 - zugeordnet sind. Solche Führungsflächen sind in der Zeichnung mit 64a, 65a, 65b, 66a und 66b bezeichnet.Compression springs 37, 38 and 39 are provided between the gripper finger pairs 9, 10 and 11, 12 and 13, 14, respectively, which cause the rollers 28 to 33 of the associated gripper finger pairs always rest with sufficient pressure on the associated link 34a to 36b. - With a view to the highest possible cycle of the forming machine or multi-stage press, it is also expedient, for reasons that are readily understandable, if the guide surfaces 34a to 36b functionally parallel with respect to the running of the rollers 28 to 33 - of course with a certain, slight spacing to the roles 28 to 33 - are assigned. Such guide surfaces are designated 64a, 65a, 65b, 66a and 66b in the drawing.

Die Stößel für die Greiferfinger sind zwischen oberen und unteren Führungsbuchsen, so beispielsweise Führungsbuchsen 60 und 61 für den Stößel 42, in Richtung des Pfeiles 62 bewegbar geführt. Zur Steuerung der Stößel in Richtung des Pfeiles 62 ist als Steuerelement für die Stößel je ein zweiarmiger Hebel vorgesehen, der in an sich bekannter Weise am Überführungsträger wie in Figur 2 dargestellt schwenkbar gelagert ist und auf ebenfalls an sich bekannte Weise über eine Rolle von einem im Maschinentakt bewegten Lineal 50 gesteuert wird, wie es aus dem Stand der Technik an sich bekannt ist. Beispielsweise ist für den Stößel 42 als Steuerelement der Hebel 44 vorgesehen, dessen einer Arm 45 mit seinem freien Ende in einer Ausnehmung 46 des Stößels 42 eingreift und dort an einer Druckfläche 47 entgegen der Wirkung der Druckfeder 43 anliegt. Der andere, mit 48 bezeichnete Arm des Hebels 44 weist an seinem freien Ende eine Rolle 49 auf, über die der Hebel 44 von dem Lineal 50 etwa in Richtung des Pfeiles 63a im Maschinentakt gesteuert wird. Das Lineal 50 befindet sich am freien Ende eines im übrigen nicht weiter dargestellten Hebels 51, der im Maschinenrahmen entsprechend schwenkbar gelagert und angetrieben ist. Diese bekannte Konstruktion ermöglichst die Überlagerung der Bewegung des Überführungsträgers 2 mit den Greifervorrichtungen 6 bis 8 in Richtung des Pfeiles 52 mit den Steuerbewegungen des Hebels 51 in Richtung des Pfeiles 63a.The plungers for the gripper fingers are movably guided in the direction of arrow 62 between upper and lower guide bushes, for example guide bushes 60 and 61 for the plunger 42. To control the plunger in the direction of arrow 62, a two-armed lever is provided as a control element for the plunger, which is pivotably mounted on the transfer carrier as shown in FIG. 2 in a manner known per se and likewise in a manner known per se via a roller from an Machine clock moving ruler 50 is controlled, as is known from the prior art. For example, the lever 44 is provided as a control element for the tappet 42, one arm 45 of which engages with its free end in a recess 46 of the tappet 42 and rests there against a pressure surface 47 against the action of the compression spring 43. The other, designated 48 arm of the lever 44 has at its free end a roller 49, via which the lever 44 is controlled by the ruler 50 approximately in the direction of arrow 63a in the machine cycle. The ruler 50 is located at the free end of a lever 51 (not shown), which is pivotably mounted and driven in the machine frame. This known construction enables the movement of the transfer carrier 2 to be superimposed on the gripper devices 6 to 8 in the direction of the arrow 52 with the control movements of the lever 51 in the direction of the arrow 63a.

Aus der Darstellung der Zeichnung ist ohne weiteres zu entnehmen, daß sich bei entsprechender Steuerung der Stößel für die Greiferfinger diese mit der ihnen jeweils zugeordneten Laufrolle 28 bis 33 entlang der Kulisse 34a, 34b bzw. 35a, 35 b bzw. 36a, 36b bewegen. An dieser Stelle sei darauf hingewiesen, daß anstelle der in der Zeichnung dargestellten Lösung für den Kurvenverlauf der Kulissen selbstverständlich in einem entsprechenden Anwendungsfall auch als spezielle Lösung ein kreisbogenförmiger bzw. halbkreisbogenförmiger Kurvenverlauf für die Kulisse sinnvoll sein kann. Im übrigen braucht die Kulisse nicht - wie in der Zeichnung dargestellt - spiegelbildlich gleich ausgeführt zu sein, sondern die Kulisse für die Rolle des anderen Greiferfingers desselben Greiferfinger-Paares spiegelbildlich abweichenden Verlauf haben.From the illustration of the drawing it can easily be seen that, with appropriate control, the plunger for the gripper fingers and the gripper fingers are assigned to them Move the rollers 28 to 33 along the link 34a, 34b or 35a, 35b or 36a, 36b. At this point, it should be pointed out that instead of the solution for the curve of the scenes shown in the drawing, a circular or semicircular curve for the scenery can of course also be useful as a special solution in a corresponding application. Otherwise, the backdrop does not - as shown in the drawing - have to be of the same mirror image, but the backdrop for the role of the other gripper finger of the same pair of gripper fingers has a different mirror image.

Weiterhin ist es möglich, anstelle einer Kulisse wie im Ausführungsbeispiel einen entsprechenden Kulissenstein vorzusehen, an dem die Rollen der Greiferfinger von außen her laufen.Furthermore, it is possible to provide a corresponding sliding block instead of a backdrop, as in the exemplary embodiment, on which the rollers of the gripper fingers run from the outside.

Weiterhin ist eine Lösung denkbar, bei der anstelle von Rollen zum Abtasten der Kulissen oder Kurven stiftförmige Bahnabtaster verwendet werden. Dabei ist es möglich, die Kurvenbahnen am Überführungsträger vorzusehen und die Greiferfinger mit entsprechenden Bahnabtastern zu versehen.Furthermore, a solution is conceivable in which pin-shaped path scanners are used instead of rollers for scanning the scenes or curves. It is possible to provide the curved tracks on the transfer girder and to provide the gripper fingers with appropriate track scanners.

Abgesehen von der grundsätzlich gegebenen Möglichkeit, die Kurvenbahnen spiegelbildlich gleich oder ungleich auszubilden und ihnen neben einem als Sonderfall möglichen kreisbogenförmigen bzw. halbkreisbogenförmigen Verlauf einen hiervon mehr oder weniger abweichenden Verlauf zu geben, ist es im Hinblick auf ein möglichst breites Anwendungsspektrum der Erfindung vorteilhaft, die Kurvenbahnen - in welcher Form auch immer - als auswechselbaren Einsatz auszubilden.Apart from the fundamentally given possibility of making the cam tracks mirror-image identical or different and to give them a more or less deviating course in addition to a circular or semicircular course which is possible as a special case, it is advantageous with regard to the widest possible range of applications of the invention which Design curved tracks - in whatever form - as interchangeable inserts.

Zum störungsfreien Betrieb der betreffenden Maschine ist es weiterhin dienlich, wenn sich die Greiferfinger zumindest bis in den Bereich der zweiten Abstützungen beidseitig in einem entsprechend gabelförmig ausgebildeten Ende des Überführungsträgers - im Fall des Ausführungsbeispiels zwischen den Führungsplatten 63 und 64 - je in einer zur Überführungsebene 15 parallelen Ebene zu führen.For trouble-free operation of the machine in question, it is also useful if the gripper fingers are at least up to the region of the second supports on both sides in a correspondingly fork-shaped end of the transfer carrier - in the case of the exemplary embodiment between the guide plates 63 and 64 - each to be guided in a plane parallel to the transfer plane 15.

Außer der im Ausführungsbeispiel gezeigten Lösung, nur eine einzige Feder, nämlich die Druckfeder 37, 38 bzw. 39 zu verwenden, kann die Anordnung auch so getroffen werden, daß jeweils eine gesonderte Druckfeder für die beiden Greiferfinger eines Greiferfinger-Paares vorgesehen ist, deren eine Enden sich wie im Ausführungsbeispiel am Greiferfinger und deren andere Enden sich an einem an den Führungsplatten 63, 64 gelagerten Anschlag abzustützen, der den Bewegungen der Greiferfinger in Richtung des Pfeiles 62 folgen kann.In addition to the solution shown in the exemplary embodiment, to use only a single spring, namely the compression spring 37, 38 and 39, the arrangement can also be such that a separate compression spring is provided for the two gripper fingers of a pair of gripper fingers, one of which Ends as in the exemplary embodiment on the gripper fingers and their other ends are supported on a stop mounted on the guide plates 63, 64, which can follow the movements of the gripper fingers in the direction of arrow 62.

Claims (9)

  1. A transfer device (1) in machines for the progressive forming of workpieces, more particularly a cross-transfer device in multistage presses, having:
    a) a transfer support (2) which can be moved forwards and backwards between a reception position and a delivery position,
    b) elongate non-crossing gripper fingers (9, 10; 11, 12; 13, 14) which are mounted associated with one another in pairs on the transfer support (2) and cooperate to form a gripper,
    c) a first support (16, 17, 18, 19, 20, 21) for the gripper fingers (9 to 14) on a tappet (42) which is provided at the end remote from the free end (53, 54, 55, 56, 57, 58) of the gripper fingers (9 to 14) and which enables the gripper fingers (9 to 14) to pivot in the transfer plane (15) and also enables the gripper fingers (9 to 14) to move substantially transversely of the transfer direction (52),
    d) a spring (43) operating on the tappet (42) in the direction of closing the gripper,
    e) a control element (44) operating on the tappet (42) against the force of the spring (43),
    f) guide means which take the form of curved tracks (34a, 34b; 35a, 35b; 36a, 36b) with track scanners (28, 29; 30, 31; 32, 33) and which control the pivoting movement of the gripper fingers (9 to 14) to a predetermined extent in dependence of their movement taking place transversely of the transfer direction (52),
    g) a curved track (64a, 64b; 65a, 65b; 66a, 66b) so extending at a constant distance from the curved tracks (34a, 34b; 35a, 35b; 36a, 36b) that the curved tracks form closed slides in which the pins (22, 23; 24, 25; 26, 27) associated with the gripper fingers (9 to 14) are guidably disposed and which form the second support of the gripper fingers (9 to 14),
    h) the slides being provided on the transfer support (guide plates 63, 64) and each having an associated track scanner (rollers 28 to 33) mounted on the gripper fingers (9 to 14).
  2. A device according to claim 1, characterized in that the curved tracks (34a to 36b; 64a to 66b) of the slides follow the same course when viewed laterally inverted.
  3. A device according to claim 1, characterized in that the curved tracks (34a to 36b; 64a to 66b) of the slides follow a different course when viewed laterally inverted.
  4. A device according to one of the preceding claims, characterized in that the curved tracks (34a to 36b; 64a to 66b) of the slides follow the course of the arc of a circle.
  5. A device according to claim 4, characterized in that the curved tracks (34a to 36b; 64a to 66b) of the slides take the form of generatrix-shaped tracks on the transfer support (guide plates 63, 64).
  6. A device according to one of the preceding claims, characterized in that the slides take the form of an interchangeable insert.
  7. A device according to one of the preceding claims, characterized in that at least as far as the zone of the pins (22 to 27), the gripper fingers (9 to 14) extend on both sides in a correspondingly forked end of the transfer support (guide plates 63, 64) in a plane parallel with the transfer plate (15).
  8. A device according to one or more of claims 1 to 7, characterized in that in a zone remote from the first supports (16 to 21) the gripper fingers (9 to 14) are so interconnected via a spring (37, 38; 39) that the track scanners (rollers 28 to 33) are retained bearing against the particular curved track (34a to 36b; 64a to 66b) of the slide.
  9. A device according to one or more of claims 1 to 7, characterized in that in a zone remote from the first supports the gripper fingers (9 to 14) each bear at one end against a spring, their other ends so bearing against the transfer support that the track scanners are retained independently of one another bearing against the particular curved track (34a, to 36b; 64a to 66b) of the slide.
EP91100760A 1990-01-26 1991-01-22 Transfer device in machines for the progressive forming of workpieces, in particular cross-transfer device in multistage presses Expired - Lifetime EP0439120B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002347A DE4002347B4 (en) 1990-01-26 1990-01-26 Transfer device on machines for the progressive molding of workpieces, in particular cross conveyor on multi-stage presses
DE4002347 1990-01-26

Publications (3)

Publication Number Publication Date
EP0439120A2 EP0439120A2 (en) 1991-07-31
EP0439120A3 EP0439120A3 (en) 1992-03-18
EP0439120B1 true EP0439120B1 (en) 1997-07-16

Family

ID=6398869

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Application Number Title Priority Date Filing Date
EP91100760A Expired - Lifetime EP0439120B1 (en) 1990-01-26 1991-01-22 Transfer device in machines for the progressive forming of workpieces, in particular cross-transfer device in multistage presses

Country Status (6)

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EP (1) EP0439120B1 (en)
JP (1) JPH05104471A (en)
AT (1) ATE155375T1 (en)
CZ (1) CZ280142B6 (en)
DE (2) DE4002347B4 (en)
SK (1) SK278693B6 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1260621B (en) * 1993-03-05 1996-04-22 METHOD AND PLANT FOR THE REALIZATION OF A METALLIC ELEMENT FOR A JOINT, IN PARTICULAR A SPHERICAL JOINT.
DE10014851C1 (en) * 2000-03-24 2001-09-27 Wafios Ag Gripper pair, especially for transverse conveyor device at multistage press for symmetrical work pieces of different diameter, has fingers forming equilateral triangle space for work piece
DE10208720B4 (en) 2002-02-28 2005-11-03 Wafios Ag Stamp-side ejection device for workpieces in single or multi-stage presses
AU2003241087A1 (en) * 2002-03-26 2003-10-08 Nedschroef Herentals N.V. Device for transferring wire pieces
CN104226881A (en) * 2013-06-21 2014-12-24 江苏天工工具有限公司 Ingot gripper
DE102017108926B4 (en) * 2017-04-26 2023-08-03 Khs Gmbh Device for transporting containers
DE102017108928B4 (en) * 2017-04-26 2022-10-27 Khs Gmbh container gripper
CN107398920B (en) * 2017-09-12 2024-04-05 北京京东乾石科技有限公司 Clamping jaw mechanism and mechanical arm
DE102022123476A1 (en) * 2022-09-14 2024-03-14 Cevotec Gmbh Device for gripping a flat structure with openings in the area of its top

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
FR1179823A (en) * 1957-07-24 1959-05-28 Renault Metal parts extraction pliers with symmetrical closure
US3630391A (en) * 1969-01-28 1971-12-28 Gulf & Western Ind Prod Co Work gripper
DE2434540C2 (en) * 1974-07-18 1983-09-08 Hatebur Umformmaschinen AG, Basel Device for the automatic transverse transport of workpieces on multi-stage forming presses
JPS5933520B2 (en) * 1977-06-10 1984-08-16 株式会社日立製作所 machine hand
BE902755A (en) * 1984-06-29 1985-10-16 Nat Machinery Co TRANSFER DEVICE FOR FORMING MACHINE AND FORMING MACHINE EQUIPPED WITH SUCH DEVICE.
DE3615812A1 (en) * 1986-05-10 1987-11-12 Schuler Gmbh L DEVICE FOR TRANSPORTING WORKPIECES IN A MULTI-STAGE FORMING PRESS
DE3704939A1 (en) * 1987-02-17 1988-08-25 Erhard Otte Mechanical gripper
JPS6478781A (en) * 1987-09-19 1989-03-24 Nissan Motor Robot hand

Also Published As

Publication number Publication date
CS9100166A2 (en) 1991-08-13
EP0439120A3 (en) 1992-03-18
EP0439120A2 (en) 1991-07-31
CZ280142B6 (en) 1995-11-15
DE4002347A1 (en) 1991-09-19
DE59108775D1 (en) 1997-08-21
DE4002347B4 (en) 2006-06-08
ATE155375T1 (en) 1997-08-15
JPH05104471A (en) 1993-04-27
SK278693B6 (en) 1998-01-14

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