EP0672480B1 - Transportsystem - Google Patents

Transportsystem Download PDF

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Publication number
EP0672480B1
EP0672480B1 EP95102384A EP95102384A EP0672480B1 EP 0672480 B1 EP0672480 B1 EP 0672480B1 EP 95102384 A EP95102384 A EP 95102384A EP 95102384 A EP95102384 A EP 95102384A EP 0672480 B1 EP0672480 B1 EP 0672480B1
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EP
European Patent Office
Prior art keywords
transport
hoisting
drive
transport system
work piece
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
EP95102384A
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German (de)
French (fr)
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EP0672480A1 (en
Inventor
Erich Harsch
Rainer Reichenbach
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.)
Mueller Weingarten AG
Original Assignee
Maschinenfabrik Mueller Weingarten AG
Mueller Weingarten AG
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Publication of EP0672480A1 publication Critical patent/EP0672480A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00Feeding, 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
    • B21D43/02Advancing work in relation to the stroke of the die or tool
    • B21D43/04Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/05Advancing 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
    • B21D43/052Devices having a cross bar
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00Feeding, 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
    • B21D43/02Advancing work in relation to the stroke of the die or tool
    • B21D43/04Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/05Advancing 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
    • B21D43/055Devices comprising a pair of longitudinally and laterally movable parallel transfer bars

Definitions

  • the invention relates to a transport system for transporting workpieces through processing stations of a press or press line according to the preamble of claim 1.
  • step or transfer presses have a transport device with which the workpieces are transported from one work station to the next.
  • the longitudinal and transverse movements controlled by cam mechanisms as well as any lifting movements of the transport device are derived from the main drive and are thus associated with the tappet movement synchronized.
  • the basic structure of such a drive is shown in EP 0 210 745, Fig. 4.
  • the classic transfer system therefore performs the following functions in two directions:
  • Gripping transverse movement
  • lifting vertical movement
  • conveying longitudinal movement
  • suction bars cannot move outwards during the pressing process, like the gripper rails in 3-axis operation with their transverse closing and opening movement, a parking position for the suction bars must be created for this suction bar transfer, in which they are moved during the actual machining process.
  • driven slides, carriages or the like can also be arranged on the support rails, to which the cross members are attached with suction devices (DE 38 24 058 C1).
  • the mounting rails only carry out a lifting movement during the transport process, while the longitudinal movement of the suction bars takes place through the slides.
  • step presses which are basically similar in structure, with the difference that the transport steps are much larger due to the tool size or workpiece size.
  • GT presses large part step presses
  • the use of stepping presses or large-part stepping presses therefore enables high production output, since all the manufacturing steps required to manufacture a workpiece are carried out simultaneously.
  • a part is completed with each ram stroke, regardless of how many workstations are required to manufacture it in individual cases.
  • a comparison with conventional press lines with individual presses therefore shows with step presses the advantage of a more compact production system, lower energy costs and investment costs, as well as less downtime when changing tools and during the changeover process.
  • step presses of the type mentioned have the disadvantage that a forced linking of all processing stations is required.
  • the workpieces are passed through the step press in a certain machining cycle, with longer parts and thus longer transport routes for large parts and the associated large tools Transport times between the individual machining processes are set because all press rams perform the machining process synchronously and at the same time.
  • An individual, phase-shifted and thus time-saving handling of the workpieces within the press is not possible.
  • the press In order to apply the high forces with simultaneous tappet loading, the press must be sized accordingly.
  • the invention is based on the object of avoiding the abovementioned disadvantages and, in particular, of obtaining as universal a transfer drive as possible for a step press and in particular a large part step press or a press line.
  • the basic idea of the invention is that the transfer is given its own drive in each tool stage, which can work independently of the adjacent drive. This achieves universal mobility of the workpiece transport between the individual processing stages, and because of the existing possibility of changing the position during the transport process, the otherwise required orientation stations can also be omitted.
  • the invention realizes the principle of a completely independent drive in any degree of freedom, i. H. that the workpiece is transported from one machining station to the next completely independently of a central drive by individually programmable drives.
  • the transport movements of the workpieces and the machining processes in the individual stations can take place at different times.
  • the control of the press and in particular the movements of the transfer must be designed so that no collisions occur.
  • the movements of the individual transfer axes inevitably run synchronously with the press drive.
  • the transfer also has 6 degrees of freedom, which means that existing tool sets can be mechanized with different partial layers. Due to the individual drives of the transfer for each tool stage, larger distances between the tool stages can be compensated for, in particular by phase shifts, so that individual presses can also be loaded in press lines without there being poor freedom of movement due to long transport routes.
  • step press 1 in particular a large part step press 1 (GT press), for example, the first five processing steps 3 to 7 in side view or in longitudinal section (FIG. 1) or in plan view (FIG. 2 ).
  • GT press large part step press 1
  • Each processing stage 3 to 7 each has a sliding table 9 with a lower tool 10 fastened thereon.
  • An upper tool 11 is fastened to a press ram 12 in each processing stage, which in turn is connected to the head piece 13 of the press via a drive chain.
  • the head pieces 13 of the press are connected to the associated press tables, not shown, by the press stands 14, 14 'to 19, 19' arranged to the side of the processing station, between which the press rams of each processing stage are guided.
  • a suction beam drive is provided for the transport of the respective workpiece 20, consisting of a suction beam or a crossbar 21 with attached suction spiders, magnet holders 22 or the like (see also FIG. 3).
  • a gripper arrangement 23 running in 3-axis movement can also be provided for the lateral gripping of the workpiece 20, as shown in FIG. 5.
  • a gripper arrangement 23 is provided with a transport system 24, which is installed as an independent workpiece transport unit for each processing stage 3 to 7.
  • Each transport system 24 consists of a first longitudinal transport device 25 for carrying out the horizontal longitudinal movement in the workpiece transport direction 27 and a second stroke / transverse movement device 26, for carrying out a stroke movement in the vertical direction 28 and any required transverse movement 29, which in 3-axis operation as a working axis or may be required in 2-axis operation as a setup axis.
  • the press according to the invention can therefore be operated in 2-axis operation or in 3-axis operation with a suction beam drive or gripper arrangement. As a result, different press systems can be implemented in a single press.
  • FIGS. 1 to 3 and FIGS. 8a to 8c being used.
  • the longitudinal transport device 25 is fastened to a lifting mechanism designed as a lifting column 30.
  • the longitudinal transport device 25 has, according to the detailed illustration according to FIGS. 8a to 8c, a horizontal longitudinal beam 31 which is fastened to a drive housing 32, which in turn is firmly connected to the lifting column 30.
  • a rope or belt 34 is attached to both ends 35, 36 of the horizontal longitudinal member 31 via a first cable or belt drive 33 and driven by a drive motor 39 via two deflection rollers 37, 37 'and a drive pinion 38. If the drive pinion 38 rotates, the belt 34 and thus the horizontal longitudinal member 31 are displaced horizontally, the Direction of displacement depends on the direction of rotation of the drive pinion 38. As a result, the horizontal longitudinal member 31 can carry out a horizontal lifting movement over almost its entire length. 8a, 8b, the longitudinal beam 31 is aligned almost completely to the right.
  • the horizontally movable longitudinal member 31 (bearing 40) mounted on the drive housing 32 in turn has guide means 41 which permit a horizontal longitudinal transport of a carriage 42.
  • the carriage 42 serves to receive the suction beam 21 or crossbar 21 or a gripper arrangement 23 shown in FIG. 5.
  • the longitudinal transport of the carriage 42 in the guide means 41 takes place via a cable or belt drive 43 fastened by means of a clamping device 78, z. B.
  • a belt 44 is guided over two deflection rollers 45, 45 ', which in turn are located at the ends of the horizontal longitudinal member.
  • the belt 44 is fastened to the drive housing 32 via a clamping device 79.
  • the slide 42 shown in a side view in FIG. 8 a and a top view in FIG. 8 b is consequently displaced in the guides 41 over almost the entire length of the longitudinal beam 31. This is indicated by arrow 46 in Fig. 8b.
  • the horizontal longitudinal transport device 25 is shown in different positions in the respective processing stage 3 to 7.
  • the first processing stage 3 in the first stand area 14, 14 ', there is a transport system 24 with the associated longitudinal transport device 25, the horizontal longitudinal beam 31 of which is oriented almost completely in the direction of the workpiece transport (arrow 27), the suction beam or the cross-beam 21 being exactly in the Machining area of the tools 10, 11 is located.
  • the workpiece placement position in the first processing stage 3 is accordingly shown here.
  • FIGS. 1 and 2 show further transport systems 24 arranged between the further press stands 15 to 19, the horizontal longitudinal beams 31 of which, with the support carriages 42 thereon for the suction beams 21, are in the various processing positions, as is the case in connection with the stroke / cross to be explained below - Movement device is described in more detail.
  • This combined lifting / transverse movement device 26 comprises a carrying carriage 49 guided in a horizontal housing 48, which in turn receives the lifting column 30 in vertical guide means 50.
  • a spindle 52 is driven via a first drive motor 51, which interacts with a spindle nut 53 fastened to the support slide 49 for the horizontal transverse displacement thereof.
  • the support carriage 49 can consequently cross the transport direction according to arrow 29 over the entire length of the drive spindles 52 be moved.
  • This transverse movement results in a closing / opening movement, in particular for a gripper arrangement, as is shown in more detail in FIG. 5. This corresponds to a 3-axis transfer operation.
  • the transverse movement (arrow 29) of the support slide 49 can be used as a set-up axis for converting the tools.
  • the combined lifting / transverse movement device has a further drive motor 54, which represents a spline shaft 55 for a lifting drive of the lifting column 30 (arrow 28).
  • z. B. also used a ball slide shaft.
  • the drive motors 51, 54 are designed as high-precision drive motors that allow programmable movement sequences in their movements. This is done, for example, with programmable servomotors 51, 54.
  • the combined lifting / transverse movement device 26 is in turn attached to an additional, height-adjustable bracket 56, which has its own height adjustment mechanism 57 as a set-up axis.
  • This height adjustment mechanism comprises, in particular, a spindle drive 58 with deflection gear 59, a common drive motor 60 being provided for the transport systems 24 arranged on both sides of the press stands.
  • FIGS. 4a, 4b shows a further possible application of the invention based on the transport system 24 according to the invention.
  • a 2-axis suction beam drive is shown in front view, the suction beam 21 from its being due to the universal actuation of the transport system 24 usually horizontal position can be brought into an inclined position 21 '.
  • the lifting mechanisms of the lifting / transverse movement devices 26 arranged on both sides are actuated differently, so that the lifting mechanism on the right in FIG. 4 assumes, for example, a higher position than the left lifting mechanism.
  • universal joints 61 are required at the ends of the suction beam, which produce a transition to the adjacent connecting flange 62.
  • the inclined position shown in Fig. 4a must of course also be compensated for by a transverse horizontal movement (arrow 29) of the transverse transport device 26, i. H. the support slide 49 carries out an adapted transverse movement (FIG. 4b).
  • This transverse movement (arrow 29) can also take place independently of the inclined position if the production of parts makes this necessary.
  • a gripper arrangement 23 can also be used for the workpiece transport instead of the suction bar operation as shown in FIG. 5.
  • the longitudinal transport device 25 suspended on the lifting column 30 has a coupling device 63 on its support carriage 42, as is shown in more detail in FIGS. 8a to 8c.
  • this coupling device 63 comprises a swivel cross 64 which is pivotable on the central bearing pin 65 Carriage 42 is mounted.
  • the swivel cross 64 has two upper arms 66, 66 ', each with a connecting bolt 67 for fastening a transverse flange 68 for fastening the suction beam 21.
  • the two lower arms 69, 69' in turn have connecting bolts 67, on which one in Figures 8a to 8c gripper arrangement not shown is to be attached.
  • the swivel cross 64 is therefore prepared to receive both a suction bar 21 and a gripper arrangement 23, the former being shown in FIGS. 1 to 4 and FIGS. 8 and the latter in FIG. 5.
  • the swivel cross 64 can be pivoted about the central bearing pin 65.
  • the swivel cross 64 has a swivel arm 70, which is shown in FIGS. 8 a and 8c and is directed downward and is swiveled about the bearing axis 65 by means of a spindle 71 and a spindle drive 72.
  • the suction bar 21 can perform a pivoting movement about the bearing axis 65.
  • additional stake-out holders 74 are indicated on the sliding tables, on which the suction bars or the gripper arrangements can be stake out for changing tools.
  • FIGS. 1 and 2 illustrates the versatility of the transport system according to the invention, which is located between each press stand area.
  • the workpiece is placed on the lower tool 10 by the transport system 24 arranged between the press stands 14, 14 ', while in the subsequent processing stage 4 the workpiece is placed on the lower tool at the same time by the between the press stands 15, 15 'arranged further transport device is placed.
  • the transport system arranged between the press stands 16, 16 ' transports the workpiece from the processing stage 4 to the processing stage 5, from which the workpiece already processed in this processing stage 5 is removed by the transport unit arranged between the press stands 17, 17'.
  • the transport device arranged between the press stands 18, 18 ' removes the workpiece arranged in the processing stage 6 and feeds it to the processing stage 7, in which the finished workpiece is being removed from the transport device arranged between the press stands 19, 19'.
  • the transport system 24 can also be located between the processing stages of a press line 2.
  • the transport systems 24 can be constructed in the same way as described above, with each transport system 24 again serving the processing stages adjacent to it on the left and right, as can be seen from FIG. 6.
  • the transport systems 24 are accordingly fastened to associated fastening supports 75, which stand in place of the press stands in the exemplary embodiments described above.
  • transport systems 24 ' are provided, each of which likewise comprises a longitudinal transport device 25 as described above, but which is suspended from two adjacent stroke / transverse movement devices 26 for better weight distribution. Both lifting / transverse movement devices 26 can then be moved up and down as a set-up axis by means of a common height adjustment mechanism 57.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)

Description

Die Erfindung betrifft ein Transportsystem zum Transportieren von Werkstücken durch Bearbeitungsstationen einer Presse oder Pressenstraße nach dem Oberbegriff des Anspruchs 1.The invention relates to a transport system for transporting workpieces through processing stations of a press or press line according to the preamble of claim 1.

Stand der Technik:State of the art:

Erfordert die Herstellung eines Werkstückes mehrere Arbeitsoperationen, so werden zur wirtschaftlichen Fertigung des Blechteils die erforderlichen Einzeloperationen in einer sogenannten Transferpresse oder Pressenstraße durchgeführt. Die Anzahl der Werkzeuge entspricht dann der Anzahl der Arbeitsstufen, die zur Herstellung eines Stufenziehteils erforderlich sind. Derartige Stufen- oder Transferpressen besitzen eine Transporteinrichtung, mit welcher die Werkstücke von einer Arbeitsstation zur nächsten weitertransportiert werden. Die über Kurvengetriebe gesteuerten Längs- und Querbewegungen sowie eventuelle Hubbewegungen der Transporteinrichtung werden vom Hauptantrieb abgeleitet und sind somit mit der Stößelbewegung synchronisiert. Der prinzipielle Aufbau eines solchen Antriebs ist in der EP 0 210 745, Fig. 4 dargestellt. Das klassische Transfersystem übt deshalb folgende Funktionen in jeweils zwei Richtungen aus:If the production of a workpiece requires several work operations, the individual operations required for the economical production of the sheet metal part are carried out in a so-called transfer press or press line. The number of tools then corresponds to the number of work stages that are required to produce a stage drawing part. Such step or transfer presses have a transport device with which the workpieces are transported from one work station to the next. The longitudinal and transverse movements controlled by cam mechanisms as well as any lifting movements of the transport device are derived from the main drive and are thus associated with the tappet movement synchronized. The basic structure of such a drive is shown in EP 0 210 745, Fig. 4. The classic transfer system therefore performs the following functions in two directions:

Greifen (Querbewegung), Heben (Vertikalbewegung), Fördern (Längsbewegung).Gripping (transverse movement), lifting (vertical movement), conveying (longitudinal movement).

Insbesondere bei der Herstellung von großflächigen Blechteilen konnten übliche 3-achsige Transferpressen die Halte- und Transportfunktion der Teile nicht mehr befriedigend erfüllen, da diese großen Teile beim Transport in den Greiferzangen zu stark durchhängen würden. Deshalb wurden die sogenannten Saugerbalken-Transfersysteme als Alternative entwickelt, bei denen große Blechteile mittels Vakuumsauger an sogenannten Saugerbalken befestigt sind. Die Saugerbalken bzw. Quertraversen sind an den durch die Transferpresse führenden Tragschienen befestigt, so daß sich die Querbewegung des 3-Achssystems zum Greifen der Werkstücke erübrigt. Da diese Saugerbalken beim Preßvorgang jedoch nicht nach außen fahren können, wie die Greiferschienen beim 3-Achsbetrieb mit ihrer quergerichteten Schließ- und Öffnungsbewegung, muß bei diesem Saugerbalkentransfer eine Parkposition für die Saugerbalken geschaffen werden, in welche diese während des eigentlichen Bearbeitungsvorgangs gefahren werden.Particularly in the production of large sheet metal parts, conventional 3-axis transfer presses could no longer fulfill the holding and transport function of the parts satisfactorily, since these large parts would sag too much during transport in the gripper tongs. That is why the so-called suction beam transfer systems were developed as an alternative, in which large sheet metal parts are attached to so-called suction beams by means of vacuum suction cups. The suction beams or crossbars are attached to the support rails leading through the transfer press, so that the transverse movement of the 3-axis system for gripping the workpieces is unnecessary. However, since these suction bars cannot move outwards during the pressing process, like the gripper rails in 3-axis operation with their transverse closing and opening movement, a parking position for the suction bars must be created for this suction bar transfer, in which they are moved during the actual machining process.

Anstelle der Längsbewegung der Tragschienen für den Längstransport können auch angetriebene Schlitten, Wagen oder dergleichen auf den Tragschienen angeordnet sein, an denen die Quertraversen mit Saugereinrichtungen befestigt sind (DE 38 24 058 C1). In diesem Fall führen die Tragschienen lediglich eine Hubbewegung beim Transportvorgang durch, während die Längsbewegung der Saugerbalken durch die Schlitten erfolgt.Instead of the longitudinal movement of the support rails for the longitudinal transport, driven slides, carriages or the like can also be arranged on the support rails, to which the cross members are attached with suction devices (DE 38 24 058 C1). In this case, the mounting rails only carry out a lifting movement during the transport process, while the longitudinal movement of the suction bars takes place through the slides.

Sowohl beim 3-achsigen Transfer der Werkstücke mit Greiferschienen als auch beim 2-Achstransfer mit Tragschienen und Saugerbalken ist es im allgemeinen erforderlich, die Werkstücke zwischen den einzelnen Bearbeitungsstationen in sogenannten Zwischenstationen oder Orientierungsstationen abzulegen, die sich im allgemeinen im Ständerbereich der Transferpresse befinden. In diesen Orientierungsstationen kann eine Lageänderung des Werkstücks erfolgen, um eine Anpassung an die nächste Bearbeitungsstufe zu erhalten (DE 38 43 975 C1).Both with 3-axis transfer of workpieces with gripper rails and with 2-axis transfer with mounting rails and suction bars, it is generally necessary to place the workpieces between the individual processing stations in so-called intermediate stations or orientation stations, which are generally located in the stand area of the transfer press. The position of the workpiece can be changed in these orientation stations in order to obtain an adaptation to the next machining step (DE 38 43 975 C1).

Die immer größer werdenden zu bearbeitenden Blechteile führten zur Weiterentwicklung der Stufen- oder Transferpressen zu sogenannten Großteil-Stufenpressen (GT-Pressen), die prinzipiell ähnlich aufgebaut sind, mit dem Unterschied, daß bedingt durch die Werkzeuggröße bzw. Werkstückgröße die Transportschritte wesentlich größer ausfallen. Der Einsatz von Stufenpressen oder Großteil-Stufenpressen ermöglicht demnach eine hohe Produktionsleistung, da alle zur Herstellung eines Werkstücks erforderlichen Fertigungsschritte gleichzeitig durchgeführt werden. Mit jedem Stößelhub wird ein Teil fertiggestellt, unabhängig davon, wieviele Arbeitsstationen zur Herstellung im Einzelfall erforderlich sind. Ein Vergleich mit herkömmlichen Pressenstraßen mit Einzelpressen zeigt deshalb bei Stufenpressen den Vorteil der kompakteren Fertigungsanlage, geringerer Energiekosten und Investitionskosten, sowie geringere Nebenzeiten beim Werkzeugwechsel und beim Umrüstvorgang.The ever larger sheet metal parts to be processed led to the further development of the step or transfer presses to so-called large part step presses (GT presses), which are basically similar in structure, with the difference that the transport steps are much larger due to the tool size or workpiece size. The use of stepping presses or large-part stepping presses therefore enables high production output, since all the manufacturing steps required to manufacture a workpiece are carried out simultaneously. A part is completed with each ram stroke, regardless of how many workstations are required to manufacture it in individual cases. A comparison with conventional press lines with individual presses therefore shows with step presses the advantage of a more compact production system, lower energy costs and investment costs, as well as less downtime when changing tools and during the changeover process.

Stufenpressen der genannten Art haben jedoch den Nachteil, daß eine Zwangsverkettung aller Bearbeitungsstationen erforderlich ist. Die Werkstücke werden in einem bestimmten Bearbeitungstakt durch die Stufenpresse hindurchgeführt, wobei bei großflächigen Teilen und damit verbundenen großen Werkzeugen längere Transportwege und damit längere Transportzeiten zwischen den einzelnen Bearbeitungsvorgängen sich einstellen, da alle Pressenstößel synchron und gleichzeitig den Bearbeitungsvorgang durchführen. Ein individuelles, phasenverschobenes und damit zeitsparendes Handling der Werkstücke innerhalb der Presse ist damit nicht möglich. Um die hohen Kräfte bei einer gleichzeitigen Stößelbeaufschlagung aufzubringen, muß die Presse entsprechend groß dimensioniert werden.However, step presses of the type mentioned have the disadvantage that a forced linking of all processing stations is required. The workpieces are passed through the step press in a certain machining cycle, with longer parts and thus longer transport routes for large parts and the associated large tools Transport times between the individual machining processes are set because all press rams perform the machining process synchronously and at the same time. An individual, phase-shifted and thus time-saving handling of the workpieces within the press is not possible. In order to apply the high forces with simultaneous tappet loading, the press must be sized accordingly.

Bei den bekannten 2-Achs- oder 3-Achsantrieben ist es auch nachteilig, daß die Einlegehöhen in den Werkzeugstufen nicht variabel sind, da die Trag- bzw. Greiferschienen nur einen gemeinsamen Hub ausführen können. Weiterhin ist durch den stets gemeinsamen Vorschubantrieb ein phasenverschobenes Arbeiten der Werkzeugstufen nicht möglich, was insbesondere beim großen Stufenabstand wegen der langen Transportwege eine schlechte Freigängigkeit ergibt.In the known 2-axis or 3-axis drives, it is also disadvantageous that the insertion heights in the tool stages are not variable, since the support or gripper rails can only carry out a common stroke. Furthermore, due to the always common feed drive, phase-shifted working of the tool stages is not possible, which results in poor freedom of movement, particularly in the case of a large step distance, because of the long transport routes.

Aus der den Oberbegriff des Patentanspruchs 1 bildenden US-A-5,140,139 ist eine Transporteinrichtung zum Transportieren von Werkstücken in einer Pressenstraße bekannt geworden, bei welcher die Werkstücke an Quertraversen befestigt sind, die mittels unabhängig voneinander betreibbaren Transportmitteln zu den einzelnen Bearbeitungsstationen transportierbar sind. Über eine, aus einer Gelenkkette bestehende Umsetzeinrichtung können die Quertraversen jeweils unabhängig voneinander von einer zur nächsten Bearbeitungsstufe transportiert werden, wobei der Transportschritt durch die Gelenkkette festgelegt ist. Variable Transportschritte und auch Ausgleichsschritte sind mit einem solchen System nicht möglich. Weiterhin zieht eine Veränderung der Transportschritte einen hohen apparativen Umbauvorgang mit sich, so daß das System insgesamt sehr unflexibel ist. Bei größeren Transportschritten führt diese Lösung auch zu breiteren Maschinen, um eine Kollisionsgefahr zu vermeiden.From the preamble of claim 1 US-A-5,140,139 a transport device for transporting workpieces in a press line has become known, in which the workpieces are fastened to cross members that can be transported to the individual processing stations by means of independently operable transport means. The crossbars can each be transported independently from one another to the next processing stage via a transfer device consisting of an articulated chain, the transport step being determined by the articulated chain. Variable transport steps and also compensation steps are not possible with such a system. Furthermore, a change in the transport steps entails a high apparatus-related conversion process, so that the system as a whole is very much is inflexible. With larger transport steps, this solution also leads to wider machines in order to avoid a risk of collision.

Aufgabe und Vorteile der Erfindung:Object and advantages of the invention:

Der Erfindung liegt die Aufgabe zugrunde, die vorgenannten Nachteile zu vermeiden und insbesondere einen möglichst universellen Transfer-Antrieb für eine Stufenpresse und insbesondere eine Großteil-Stufenpresse oder eine Pressenstraße zu erhalten.The invention is based on the object of avoiding the abovementioned disadvantages and, in particular, of obtaining as universal a transfer drive as possible for a step press and in particular a large part step press or a press line.

Diese Aufgabe wird ausgehend von einem Transportsystem nach dem Oberbegriff des Anspruchs 1, durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved on the basis of a transport system according to the preamble of claim 1, by the characterizing features of claim 1.

In den Unteransprüchen sind vorteilhafte und zweckmäßige Weiterbildungen des im Hauptanspruch angegebenen Transportsystems angegeben.Advantageous and expedient developments of the transport system specified in the main claim are specified in the subclaims.

Der Erfindung liegt der Kerngedanke zugrunde, daß der Transfer in jeder Werkzeugstufe einen eigenen Antrieb erhält, der unabhängig vom benachbarten Antrieb arbeiten kann. Hierdurch wird eine universelle Beweglichkeit des Werkstücktransports zwischen den einzelnen Bearbeitungsstufen erzielt, wobei aufgrund der bestehenden Möglichkeit zur Lageveränderung während des Transportvorgangs auch die sonst erforderlichen Orientierungsstationen entfallen können.The basic idea of the invention is that the transfer is given its own drive in each tool stage, which can work independently of the adjacent drive. This achieves universal mobility of the workpiece transport between the individual processing stages, and because of the existing possibility of changing the position during the transport process, the otherwise required orientation stations can also be omitted.

Die Erfindung verwirklicht das Prinzip eines völlig unabhängigen Antriebs in beliebigen Freiheitsgraden, d. h. daß der Werkstücktransport von einer zur nächsten Bearbeitungsstation völlig unabhängig von einem Zentralantrieb durch einzeln programmierbare Antriebe erfolgt. Hierdurch ist es nicht mehr erforderlich, daß die Stößelbewegung aller nebeneinander liegenden Pressenstufen gleich erfolgen. Vielmehr können die Transportbewegungen der Werkstücke und die Bearbeitungsvorgänge in den einzelnen Stationen zeitlich versetzt stattfinden. Selbstverständlich muß die Steuerung der Presse und insbesondere die Bewegungen des Transfers so gestaltet werden, daß keine Kollisionen entstehen. Die Bewegungen der einzelnen Transferachsen laufen mit dem Pressenantrieb zwangsläufig synchron. Weiterhin besitzt der Transfer 6 Freiheitsgrade, wodurch vorhandene Werkzeugsätze mit verschiedenen Teillagen mechanisiert werden können. Durch die Einzelantriebe des Transfers für jede Werkzeugstufe können insbesondere durch Phasenverschiebungen größere Abstände der Werkzeugstufen zueinander kompensiert werden, so daß auch Einzelpressen in Pressenstraßen beschickt werden können, ohne daß es eine schlechtere Freigängigkeit wegen zu langen Transportwegen gibt.The invention realizes the principle of a completely independent drive in any degree of freedom, i. H. that the workpiece is transported from one machining station to the next completely independently of a central drive by individually programmable drives. As a result, it is no longer necessary for the ram movement of all the press stages lying next to one another to be the same. Rather, the transport movements of the workpieces and the machining processes in the individual stations can take place at different times. Of course, the control of the press and in particular the movements of the transfer must be designed so that no collisions occur. The movements of the individual transfer axes inevitably run synchronously with the press drive. The transfer also has 6 degrees of freedom, which means that existing tool sets can be mechanized with different partial layers. Due to the individual drives of the transfer for each tool stage, larger distances between the tool stages can be compensated for, in particular by phase shifts, so that individual presses can also be loaded in press lines without there being poor freedom of movement due to long transport routes.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der Beschreibung und den beigefügten zugehörigen Zeichnungen.Further details and advantages of the invention will become apparent from the description and the accompanying drawings.

Die einzelnen Figuren des Ausführungsbeispiels zeigen

Fig. 1
einen Längsschnitt durch eine Transferpresse nach der Schnittlinie A-A in Fig. 2,
Fig. 2
eine Draufsicht auf die Transferpresse nach Fig. 1 entlang der Schnittlinie B-B,
Fig. 3
einen Schnitt entlang der Schnittlinie C-C in Fig. 1 mit einem Teiletransport mit Saugerbalken,
Fig. 4a
eine Teileentnahme mit Saugerbalken und Schwenken quer zur Transportrichtung entsprechend dem Schnitt D-D in Fig. 1,
Fig. 4b
einen Teiletransport mit in die Waagerechte geschwenkten Saugerbalken entsprechend dem Schnitt D-D in Fig. 1,
Fig. 5
eine Ansicht in Transportrichtung mit einem Greifer-Transport im 3-Achsbetrieb,
Fig. 6
einen Längsschnitt durch eine aus verketteten Einzelpressen bestehende Pressenstraße nach dem Schnitt E-E in Fig. 7,
Fig. 7
eine Ansicht in Transportrichtung entsprechend dem Schnitt F-F in Fig. 6 einer verketteten Pressenstraße und
Fig. 8a - 8c
eine Einzeldarstellung des Horizontalantriebs des Transportsystems.
The individual figures of the exemplary embodiment show
Fig. 1
2 shows a longitudinal section through a transfer press along the section line AA in FIG. 2,
Fig. 2
2 shows a plan view of the transfer press according to FIG. 1 along the section line BB,
Fig. 3
2 shows a section along the section line CC in FIG. 1 with a parts transport with suction bar,
Fig. 4a
a part removal with suction bar and swiveling transversely to the transport direction according to the section DD in Fig. 1,
Fig. 4b
a transport of parts with horizontally swiveled suction bars according to the section DD in Fig. 1,
Fig. 5
a view in the transport direction with a gripper transport in 3-axis operation,
Fig. 6
7 shows a longitudinal section through a press line consisting of interlinked individual presses according to section EE in FIG. 7,
Fig. 7
a view in the transport direction according to the section FF in Fig. 6 of a linked press line and
Figures 8a-8c
an individual representation of the horizontal drive of the transport system.

Beschreibung:Description:

In den Figuren 1 und 2 sind in einer Stufenpresse 1 und insbesondere einer Großteil-Stufenpresse 1 (GT-Presse) beispielsweise die ersten fünf Bearbeitungsstufen 3 bis 7 in Seitenansicht bzw. im Längsschnitt (Fig. 1) bzw. in Draufsicht (Fig. 2) dargestellt. Jede Bearbeitungsstufe 3 bis 7 weist jeweils einen Schiebetisch 9 mit hierauf befestigtem Unterwerkzeug 10 auf. Ein Oberwerkzeug 11 ist in jeder Bearbeitungsstufe an einem Pressenstößel 12 befestigt, der seinerseits über eine Antriebskette mit dem Kopfstück 13 der Presse verbunden ist.In FIGS. 1 and 2, in a step press 1 and in particular a large part step press 1 (GT press), for example, the first five processing steps 3 to 7 in side view or in longitudinal section (FIG. 1) or in plan view (FIG. 2 ). Each processing stage 3 to 7 each has a sliding table 9 with a lower tool 10 fastened thereon. An upper tool 11 is fastened to a press ram 12 in each processing stage, which in turn is connected to the head piece 13 of the press via a drive chain.

Die Kopfstücke 13 der Presse sind mit den zugehörigen, nicht dargestellten Pressentischen durch die seitlich der Bearbeitungsstation angeordneten Pressenständer 14, 14' bis 19, 19' verbunden, zwischen denen die Pressenstößel jeder Bearbeitungsstufe geführt sind.The head pieces 13 of the press are connected to the associated press tables, not shown, by the press stands 14, 14 'to 19, 19' arranged to the side of the processing station, between which the press rams of each processing stage are guided.

Im Ausführungsbeispiel nach Fig. 1 und 2 ist für den Transport des jeweiligen Werkstücks 20 ein Saugerbalkenantrieb vorgesehen, bestehend aus einem Saugerbalken oder einer Quertraverse 21 mit daran befestigten Saugerspinnen, Magnethaltern 22 oder dergleichen (siehe auch Fig. 3).In the exemplary embodiment according to FIGS. 1 and 2, a suction beam drive is provided for the transport of the respective workpiece 20, consisting of a suction beam or a crossbar 21 with attached suction spiders, magnet holders 22 or the like (see also FIG. 3).

Anstelle der Saugerbalken 21 kann auch gemäß der Darstellung nach Fig. 5 eine in 3-achsiger Bewegung verlaufende Greiferanordnung 23 zum seitlichen Erfassen des Werkstücks 20 vorgesehen sein.Instead of the suction bar 21, a gripper arrangement 23 running in 3-axis movement can also be provided for the lateral gripping of the workpiece 20, as shown in FIG. 5.

Sowohl für den im allgemeinen 2-achsigen Saugerbalkentransport als auch für den 3-achsigen Transport der Greiferanordnung 23 durch die Stufenpresse nach Fig. 1 und 2 ist ein Transportsystem 24 vorgesehen, welches für jede Bearbeitungsstufe 3 bis 7 als eigenständige Werkstücktransporteinheit installiert ist. Dabei besteht jedes Transportsystem 24 aus einer ersten Längstransporteinrichtung 25 zur Durchführung der horizontalen Längsbewegung in Werkstücktransportrichtung 27 und einer zweiten Hub/Quer-Bewegungseinrichtung 26, zur Durchführung einer Hubbewegung in Vertikalrichtung 28 und einer gegebenenfalls erforderlichen Querbewegung 29, die im 3-Achsbetrieb als Arbeitsachse oder im 2-Achsbetrieb als Rüstachse gegebenenfalls erforderlich ist. Die erfindungsgemäße Presse kann demzufolge im 2-achsigen Betrieb oder im 3-achsigen Betrieb mit Saugerbalkenantrieb oder Greiferanordnung betrieben werden. Hierdurch können unterschiedliche Pressensysteme in einer einzigen Presse verwirklicht werden.Both for the generally 2-axis suction beam transport and for 3-axis transport 1 and 2, a gripper arrangement 23 is provided with a transport system 24, which is installed as an independent workpiece transport unit for each processing stage 3 to 7. Each transport system 24 consists of a first longitudinal transport device 25 for carrying out the horizontal longitudinal movement in the workpiece transport direction 27 and a second stroke / transverse movement device 26, for carrying out a stroke movement in the vertical direction 28 and any required transverse movement 29, which in 3-axis operation as a working axis or may be required in 2-axis operation as a setup axis. The press according to the invention can therefore be operated in 2-axis operation or in 3-axis operation with a suction beam drive or gripper arrangement. As a result, different press systems can be implemented in a single press.

Zunächst wird nachfolgend die Längstransporteinrichtung 25 des Transportsystems 24 näher erläutert, wobei die Figuren 1 bis 3 sowie die Figuren 8a bis 8c heranzuziehen sind.First, the longitudinal transport device 25 of the transport system 24 is explained in more detail below, FIGS. 1 to 3 and FIGS. 8a to 8c being used.

Wie insbesondere aus der Fig. 3 ersichtlich, ist die Längstransporteinrichtung 25 an einem, als Hubsäule 30 ausgebildeten Hubmechanismus befestigt. Die Längstransporteinrichtung 25 weist gemäß der näheren Darstellung nach den Figuren 8a bis 8c einen horizontalen Längsträger 31 auf, der an einem Antriebsgehäuse 32 befestigt ist, welches seinerseits mit der Hubsäule 30 fest verbunden ist. Über einen ersten Seilzug- oder Riemenantrieb 33 wird ein Seil oder Riemen 34 an beiden Enden 35, 36 des horizontalen Längsträgers 31 befestigt und über zwei Umlenkrollen 37, 37' und einem Antriebsritzel 38 von einem Antriebsmotor 39 angetrieben. Dreht sich das Antriebsritzel 38, so wird der Riemen 34 und damit der horizontale Längsträger 31 horizontal verschoben, wobei die Verschiebungsrichtung sich nach der Umdrehungsrichtung des Antriebsritzels 38 richtet. Hierdurch kann der horizontale Längsträger 31 eine horizontale Hubbewegung nahezu über seine gesamte Länge durchführen. In Fig. 8a, 8b ist der Längsträger 31 nahezu vollständig nach rechts ausgerichtet.As can be seen in particular from FIG. 3, the longitudinal transport device 25 is fastened to a lifting mechanism designed as a lifting column 30. The longitudinal transport device 25 has, according to the detailed illustration according to FIGS. 8a to 8c, a horizontal longitudinal beam 31 which is fastened to a drive housing 32, which in turn is firmly connected to the lifting column 30. A rope or belt 34 is attached to both ends 35, 36 of the horizontal longitudinal member 31 via a first cable or belt drive 33 and driven by a drive motor 39 via two deflection rollers 37, 37 'and a drive pinion 38. If the drive pinion 38 rotates, the belt 34 and thus the horizontal longitudinal member 31 are displaced horizontally, the Direction of displacement depends on the direction of rotation of the drive pinion 38. As a result, the horizontal longitudinal member 31 can carry out a horizontal lifting movement over almost its entire length. 8a, 8b, the longitudinal beam 31 is aligned almost completely to the right.

Wie insbesondere aus den Figuren 8a und 8b ersichtlich, weist der horizontal verfahrbare und am Antriebsgehäuse 32 gelagerte Längsträger 31 (Lager 40) seinerseits Führungsmittel 41 auf, die einen horizontalen Längstransport eines Schlittens 42 erlauben. Der Schlitten 42 dient zur Aufnahme des Saugerbalkens 21 bzw. Quertraverse 21 oder einer in der Fig. 5 dargestellten Greiferanordnung 23.As can be seen in particular from FIGS. 8a and 8b, the horizontally movable longitudinal member 31 (bearing 40) mounted on the drive housing 32 in turn has guide means 41 which permit a horizontal longitudinal transport of a carriage 42. The carriage 42 serves to receive the suction beam 21 or crossbar 21 or a gripper arrangement 23 shown in FIG. 5.

Der Längstransport des Schlittens 42 in den Führungsmitteln 41 geschieht wiederum über einen, mittels Klemmvorrichtung 78 befestigten Seilzug- oder Riemenantrieb 43, wobei z. B. ein Riemen 44 über zwei Umlenkrollen 45, 45', die sich wiederum endseitig des horizontalen Längsträgers befinden, geführt ist. Der Riemen 44 ist über eine Klemmeinrichtung 79 am Antriebsgehäuse 32 befestigt. Bei der horizontalen Längsverschiebung des Längsträgers 31 wird der Riemen 44 zwangsläufig mitbewegt, und damit auch der daran befestigte Schlitten 42. Hierdurch vollzieht der Schlitten 42 den doppelten Weg wie der Längsträger 31 (Hubverdoppelung).The longitudinal transport of the carriage 42 in the guide means 41 in turn takes place via a cable or belt drive 43 fastened by means of a clamping device 78, z. B. a belt 44 is guided over two deflection rollers 45, 45 ', which in turn are located at the ends of the horizontal longitudinal member. The belt 44 is fastened to the drive housing 32 via a clamping device 79. When the longitudinal beam 31 is displaced horizontally, the belt 44 is inevitably moved along with it, and thus also the carriage 42 attached to it. As a result, the carriage 42 executes twice the path of the longitudinal beam 31 (doubling the stroke).

Der in Fig. 8a in Seitenansicht sowie in Fig. 8b in Draufsicht dargestellte Schlitten 42 wird demzufolge in den Führungen 41 über nahezu die gesamte Länge des Längsträgers 31 verschoben. Dies ist mit Pfeil 46 in Fig. 8b angedeutet.The slide 42 shown in a side view in FIG. 8 a and a top view in FIG. 8 b is consequently displaced in the guides 41 over almost the entire length of the longitudinal beam 31. This is indicated by arrow 46 in Fig. 8b.

Die in Fig. 8a in Seitenansicht sowie in Fig. 8b in Draufsicht, in Fig. 8c in Stirnansicht dargestellte Längstransporteinrichtung 25 führt demzufolge eine doppelte Längsbewegung aus, die sich zum einen aus der Längsverschiebung des horizontalen Längsträgers 31 selbst (Pfeil 47) und der zusätzlichen Bewegung des Tragschlittens 42 am horizontalen Längsträger 31 (Pfeil 46) zusammensetzt.The longitudinal transport device 25 shown in FIG. 8a in side view and in FIG. 8b in plan view, in FIG. 8c in front view, consequently executes a double longitudinal movement, which is due to the longitudinal displacement of the horizontal longitudinal member 31 itself (Arrow 47) and the additional movement of the support carriage 42 on the horizontal longitudinal member 31 (arrow 46).

Demzufolge ist in der Fig. 1 und 2 die horizontale Längstransporteinrichtung 25 in verschiedenen Positionen in der jeweiligen Bearbeitungsstufe 3 bis 7 dargestellt. Beispielsweise befindet sich in der ersten Bearbeitungsstufe 3 im ersten Ständerbereich 14, 14' ein Transportsystem 24 mit zugehöriger Längstransporteinrichtung 25, dessen horizontaler Längsträger 31 nahezu vollständig in Richtung Werkstücktransport (Pfeil 27) ausgerichtet ist, wobei sich der Saugerbalken bzw. die Quertraverse 21 genau im Bearbeitungsbereich der Werkzeuge 10, 11 befindet. Hier ist demzufolge die Werkstückablegeposition in der ersten Bearbeitungsstufe 3 gezeigt.1 and 2, the horizontal longitudinal transport device 25 is shown in different positions in the respective processing stage 3 to 7. For example, in the first processing stage 3, in the first stand area 14, 14 ', there is a transport system 24 with the associated longitudinal transport device 25, the horizontal longitudinal beam 31 of which is oriented almost completely in the direction of the workpiece transport (arrow 27), the suction beam or the cross-beam 21 being exactly in the Machining area of the tools 10, 11 is located. The workpiece placement position in the first processing stage 3 is accordingly shown here.

Die Figuren 1 und 2 zeigen zwischen den weiteren Pressenständern 15 bis 19 angeordnete weitere Transportsysteme 24, deren horizontale Längsträger 31 mit sich daran befindenden Tragschlitten 42 für die Saugerbalken 21 in den verschiedenen Bearbeitungsstellungen befindet, wie dies im Zusammenhang mit der nachfolgend zu erläuternden Hub/Quer-Bewegungseinrichtung näher beschrieben wird.FIGS. 1 and 2 show further transport systems 24 arranged between the further press stands 15 to 19, the horizontal longitudinal beams 31 of which, with the support carriages 42 thereon for the suction beams 21, are in the various processing positions, as is the case in connection with the stroke / cross to be explained below - Movement device is described in more detail.

Aus den Figuren 1 bis 3 ist der Aufbau der Hub/Quer-Bewegungseinrichtung 26 des Transportsystems 24 näher ersichtlich. Diese kombinierte Hub/Quer-Bewegungseinrichtung 26 umfaßt einen in einem horizontalen Gehäuse 48 geführten Tragschlitten 49, welcher seinerseits in vertikalen Führungsmitteln 50 die Hubsäule 30 aufnimmt. Über einen ersten Antriebsmotor 51 wird eine Spindel 52 angetrieben, die mit einer am Tragschlitten 49 befestigten Spindelmutter 53 zu dessen horizontalen Querverschiebung zusammenwirkt. In Fig. 3 kann demzufolge der Tragschlitten 49 quer zur Transportrichtung entsprechend Pfeil 29 über die gesamte Länge der Antriebsspindeln 52 verschoben werden. Durch diese Querbewegung wird eine Schließ-/Öffnungsbewegung insbesondere für eine Greiferanordnung durchgeführt, wie sie in Fig. 5 näher dargestellt ist. Dies entspricht einem 3-achsigen Transferbetrieb.The construction of the lifting / transverse movement device 26 of the transport system 24 can be seen in more detail from FIGS. 1 to 3. This combined lifting / transverse movement device 26 comprises a carrying carriage 49 guided in a horizontal housing 48, which in turn receives the lifting column 30 in vertical guide means 50. A spindle 52 is driven via a first drive motor 51, which interacts with a spindle nut 53 fastened to the support slide 49 for the horizontal transverse displacement thereof. In FIG. 3, the support carriage 49 can consequently cross the transport direction according to arrow 29 over the entire length of the drive spindles 52 be moved. This transverse movement results in a closing / opening movement, in particular for a gripper arrangement, as is shown in more detail in FIG. 5. This corresponds to a 3-axis transfer operation.

Sofern die Pressenanordnung mit einem 2-achsigen Saugerbalkenbetrieb arbeitet, kann die Querbewegung (Pfeil 29) des Tragschlittens 49 als Rüstachse zur Umrüstung der Werkzeuge verwendet werden.If the press arrangement works with a 2-axis suction beam operation, the transverse movement (arrow 29) of the support slide 49 can be used as a set-up axis for converting the tools.

Neben dem Querantrieb 51 bis 53 für den Schlitten 49 weist die kombinierte Hub/Quer-Bewegungseinrichtung einen weiteren Antriebsmotor 54 auf, der eine Keilwelle 55 für einen Hubantrieb der Hubsäule 30 darstellt (Pfeil 28). Hierfür wird z. B. auch eine Kugelschiebewelle eingesetzt. Die Antriebsmotoren 51, 54 werden als hochpräzise Antriebsmotore ausgebildet, die in ihren Bewegungen programmierbare Bewegungsabläufe gestatten. Dies geschieht beispielsweise mit programmierbaren Servomotoren 51, 54.In addition to the transverse drive 51 to 53 for the slide 49, the combined lifting / transverse movement device has a further drive motor 54, which represents a spline shaft 55 for a lifting drive of the lifting column 30 (arrow 28). For this, z. B. also used a ball slide shaft. The drive motors 51, 54 are designed as high-precision drive motors that allow programmable movement sequences in their movements. This is done, for example, with programmable servomotors 51, 54.

Die kombinierte Hub/Quer-Bewegungseinrichtung 26 ist ihrerseits an einer zusätzlichen, höhenverstellbaren Konsole 56 befestigt, die einen eigenen Höhenverstellmechanismus 57 als Rüstachse aufweist. Dieser Höheverstellmechanismus umfaßt insbesondere einen Spindelantrieb 58 mit Umlenkgetriebe 59, wobei ein gemeinsamer Antriebsmotor 60 für die beidseitig an den Pressenständern angeordneten Transportsysteme 24 vorgesehen ist.The combined lifting / transverse movement device 26 is in turn attached to an additional, height-adjustable bracket 56, which has its own height adjustment mechanism 57 as a set-up axis. This height adjustment mechanism comprises, in particular, a spindle drive 58 with deflection gear 59, a common drive motor 60 being provided for the transport systems 24 arranged on both sides of the press stands.

Anstelle des zuvor beschriebenen Systems einer Hub/Quer-Bewegungseinrichtung 26 kann selbstverständlich auch ein ähnliches Antriebssystem verwendet werden. Hierzu wird beispielsweise auf den Inhalt der DE 32 33 428 C2 verwiesen, die einen kombinierten Hubantrieb mit Längsantrieb mittels eines Riemenantriebs aufzeigt. Eine solche Anordnung wäre sinngemäß ebenfalls einsetzbar und ist schematisch in Fig. 7 gezeigt.Instead of the system of a lifting / transverse movement device 26 described above, a similar drive system can of course also be used. For this purpose, reference is made, for example, to the content of DE 32 33 428 C2, which shows a combined linear actuator with longitudinal drive by means of a belt drive. Such an arrangement would be can also be used analogously and is shown schematically in FIG. 7.

Die Darstellung der Erfindung nach Fig. 4a, 4b zeigt eine weitere Anwendungsmöglichkeit der Erfindung aufgrund des erfindungsgemäßen Transportsystems 24. Auch hier ist ein an sich 2-achsiger Saugerbalkenantrieb in Stirnansicht gezeigt, wobei aufgrund der universellen Betätigung des Transportsystems 24, der Saugerbalken 21 aus seiner üblicherweise horizontalen Position in eine Schräglage 21' gebracht werden kann. Hierfür werden die Hubmechanismen der beiderseitig angeordneten Hub/Quer-Bewegungseinrichtungen 26 unterschiedlich betätigt, so daß der in Fig. 4 rechte Hubmechanismus beispielsweise eine höhere Position einnimmt als der linke Hubmechanismus. Um die Schräglage des Saugerbalkens 21' auszugleichen, sind allerdings Kardangelenke 61 an den Enden des Saugerbalkens erforderlich, die einen Übergang zum benachbarten Anschlußflansch 62 herstellen. Die in Fig. 4a dargestellte Schräglage muß selbstverständlich auch durch eine quergerichtete Horizontalbewegung (Pfeil 29) der Quertransporteinrichtung 26 kompensiert werden, d. h. der Tragschlitten 49 führt eine angepaßte Querbewegung durch (Fig. 4b). Diese Querbewegung (Pfeil 29) kann auch unabhängig von der Schräglage erfolgen, wenn die Teilefertigung dies erforderlich macht.The representation of the invention according to FIGS. 4a, 4b shows a further possible application of the invention based on the transport system 24 according to the invention. Here, too, a 2-axis suction beam drive is shown in front view, the suction beam 21 from its being due to the universal actuation of the transport system 24 usually horizontal position can be brought into an inclined position 21 '. For this purpose, the lifting mechanisms of the lifting / transverse movement devices 26 arranged on both sides are actuated differently, so that the lifting mechanism on the right in FIG. 4 assumes, for example, a higher position than the left lifting mechanism. In order to compensate for the inclined position of the suction beam 21 ', universal joints 61 are required at the ends of the suction beam, which produce a transition to the adjacent connecting flange 62. The inclined position shown in Fig. 4a must of course also be compensated for by a transverse horizontal movement (arrow 29) of the transverse transport device 26, i. H. the support slide 49 carries out an adapted transverse movement (FIG. 4b). This transverse movement (arrow 29) can also take place independently of the inclined position if the production of parts makes this necessary.

Wie zuvor erwähnt, kann gemäß der Darstellung nach Fig. 5 anstelle des Saugerbalkenbetriebs auch eine Greiferanordnung 23 für den Werkstücktransport eingesetzt werden. Zur Umrüstung zwischen Saugerbalkenbetrieb nach Fig. 3 und Greiferbetrieb nach Fig. 5 weist die an der Hubsäule 30 aufgehängte Längstransporteinrichtung 25 an ihrem Tragschlitten 42 eine Kupplungseinrichtung 63 auf, wie sie in den Figuren 8a bis 8c näher dargestellt ist. Insbesondere umfaßt diese Kupplungseinrichtung 63 ein Schwenkkreuz 64, welches über einen zentralen Lagerbolzen 65 schwenkbar an dem Tragschlitten 42 gelagert ist. Das Schwenkkreuz 64 weist zwei obere Arme 66, 66' auf, mit jeweils einem Anschlußbolzen 67 zur Befestigung eines Querflansches 68 zur Befestigung des Saugerbalkens 21. Die beiden unteren Arme 69, 69' weisen ihrerseits Anschlußbolzen 67 auf, an denen eine in den Figuren 8a bis 8c nicht näher dargestellte Greiferanordnung zu befestigen ist. Das Schwenkkreuz 64 ist demzufolge dafür vorbereitet, sowohl einen Saugerbalken 21 als auch eine Greiferanordnung 23 aufzunehmen, wobei ersteres in Fig. 1 bis 4 sowie den Figuren 8 und letzteres in der Fig. 5 dargestellt ist.As previously mentioned, a gripper arrangement 23 can also be used for the workpiece transport instead of the suction bar operation as shown in FIG. 5. To convert between suction bar operation according to FIG. 3 and gripper operation according to FIG. 5, the longitudinal transport device 25 suspended on the lifting column 30 has a coupling device 63 on its support carriage 42, as is shown in more detail in FIGS. 8a to 8c. In particular, this coupling device 63 comprises a swivel cross 64 which is pivotable on the central bearing pin 65 Carriage 42 is mounted. The swivel cross 64 has two upper arms 66, 66 ', each with a connecting bolt 67 for fastening a transverse flange 68 for fastening the suction beam 21. The two lower arms 69, 69' in turn have connecting bolts 67, on which one in Figures 8a to 8c gripper arrangement not shown is to be attached. The swivel cross 64 is therefore prepared to receive both a suction bar 21 and a gripper arrangement 23, the former being shown in FIGS. 1 to 4 and FIGS. 8 and the latter in FIG. 5.

Gemäß der Anordnung nach Fig. 8a bis 8c ist eine Verschwenkbarkeit des Schwenkkreuzes 64 um den zentralen Lagerbolzen 65 möglich. Hierfür weist das Schwenkkreuz 64 einen in Fig. 8a sowie Fig. 8c dargestellten, nach unten gerichteten Schwenkarm 70 auf, der mittels einer Spindel 71 und einem Spindelantrieb 72 um die Lagerachse 65 verschwenkt wird. Hierdurch kann der Saugerbalken 21 eine Schwenkbewegung um die Lagerachse 65 durchführen.According to the arrangement according to FIGS. 8a to 8c, the swivel cross 64 can be pivoted about the central bearing pin 65. For this purpose, the swivel cross 64 has a swivel arm 70, which is shown in FIGS. 8 a and 8c and is directed downward and is swiveled about the bearing axis 65 by means of a spindle 71 and a spindle drive 72. As a result, the suction bar 21 can perform a pivoting movement about the bearing axis 65.

In den Figuren 3 bis 5 sind auf den Schiebetischen zusätzliche Absteckhalter 74 angedeutet, auf welche die Saugerbalken oder die Greiferanordnungen zum Werkzeugwechsel absteckbar sind.In FIGS. 3 to 5, additional stake-out holders 74 are indicated on the sliding tables, on which the suction bars or the gripper arrangements can be stake out for changing tools.

Die Darstellung der Erfindung nach Fig. 1 und 2 verdeutlicht die Vielseitigkeit des erfindungsgemäßen Transportsystems, welches sich zwischen jedem Pressenständerbereich befindet. So wird in der ersten Bearbeitungsstufe 3 das Werkstück beispielsweise von dem zwischen den Pressenständern 14, 14' angeordneten Transportsystem 24 auf das Unterwerkzeug 10 aufgelegt, während in der nachfolgenden Bearbeitungsstufe 4 zur gleichen Zeit das Werkstück auf das Unterwerkzeug durch die zwischen den Pressenständern 15, 15' angeordnete weitere Transporteinrichtung gelegt wird. Zur gleichen Zeit transportiert das zwischen den Pressenständern 16, 16' angeordnete Transportsystem das Werkstück von der Bearbeitungsstufe 4 zur Bearbeitungsstufe 5, aus welcher gerade das bereits in dieser Bearbeitungsstufe 5 bearbeitete Werkstück durch die zwischen den Pressenständern 17, 17' angeordnete Transporteinheit entnommen wird. Zur gleichen Zeit entnimmt das zwischen den Pressenständern 18, 18' angeordnete Transportgerät das in der Bearbeitungsstufe 6 angeordnete Werkstück und führt dieses der Bearbeitungsstufe 7 zu, in welchem gerade das fertige Werkstück von dem zwischen den Pressenständern 19, 19' angeordneten Transportgerät entnommen wird.The illustration of the invention according to FIGS. 1 and 2 illustrates the versatility of the transport system according to the invention, which is located between each press stand area. In the first processing stage 3, for example, the workpiece is placed on the lower tool 10 by the transport system 24 arranged between the press stands 14, 14 ', while in the subsequent processing stage 4 the workpiece is placed on the lower tool at the same time by the between the press stands 15, 15 'arranged further transport device is placed. At the same time The transport system arranged between the press stands 16, 16 'transports the workpiece from the processing stage 4 to the processing stage 5, from which the workpiece already processed in this processing stage 5 is removed by the transport unit arranged between the press stands 17, 17'. At the same time, the transport device arranged between the press stands 18, 18 'removes the workpiece arranged in the processing stage 6 and feeds it to the processing stage 7, in which the finished workpiece is being removed from the transport device arranged between the press stands 19, 19'.

Aus der Fig. 1 ist demzufolge ersichtlich, daß die einzelnen Pressenstößel auch in unterschiedlichen Arbeitshöhen, d. h. in verschiedenen Bearbeitungsabläufen angeordnet sind. Demzufolge findet auch der eigentliche Preßvorgang am Werkstück zu unterschiedlichen Zeiten an den einzelnen Bearbeitungsstationen statt. Beispielsweise befindet sich der Pressenstößel in der Bearbeitungsstufe 5 gerade im oberen Totpunkt.From Fig. 1 it can therefore be seen that the individual press rams also at different working heights, ie. H. are arranged in different machining processes. As a result, the actual pressing process on the workpiece takes place at different times at the individual processing stations. For example, the press ram in processing stage 5 is currently at top dead center.

Gemäß der Darstellung der Erfindung in Fig. 6 kann das erfindungsgemäße Transportsystem 24 sich auch zwischen den Bearbeitungsstufen einer Pressenstraße 2 befinden. Dabei können die Transportsysteme 24 prinzipiell gleich aufgebaut sein, wie zuvor beschrieben, wobei wiederum jedes Transportsystem 24 die jeweils von ihm links und rechts benachbarten Bearbeitungsstufen bedient, wie dies aus Fig. 6 ersichtlich ist. Zwischen den in Fig. 6 dargestellten drei Bearbeitungsstufen 3' bis 5', sind die Transportsysteme 24 demzufolge an zugehörige Befestigungsträger 75 befestigt, die anstelle der Pressenständer in den zuvor beschriebenen Ausführungsbeispielen stehen.According to the representation of the invention in FIG. 6, the transport system 24 according to the invention can also be located between the processing stages of a press line 2. In principle, the transport systems 24 can be constructed in the same way as described above, with each transport system 24 again serving the processing stages adjacent to it on the left and right, as can be seen from FIG. 6. Between the three processing stages 3 'to 5' shown in FIG. 6, the transport systems 24 are accordingly fastened to associated fastening supports 75, which stand in place of the press stands in the exemplary embodiments described above.

Um die großen Transportwege zwischen den einzelnen Pressenstufen überbrücken zu können, sind gemäß Darstellung in Fig. 6 Transportsysteme 24' vorgesehen, die ebenfalls jeweils eine wie zuvor beschriebene Längstransporteinrichtung 25 umfassen, die jedoch an zwei nebeneinanderliegenden Hub/Quer-Bewegungseinrichtungen 26 zur besseren Gewichtsverteilung aufgehängt ist. Beide Hub/Quer-Bewegungseinrichtunten 26 können dann mittels eines gemeinsamen Höhenverstellmechanismuses 57 als Rüstachse auf- und abbewegt werden.To the great transport routes between the individual To be able to bridge press stages, as shown in FIG. 6, transport systems 24 'are provided, each of which likewise comprises a longitudinal transport device 25 as described above, but which is suspended from two adjacent stroke / transverse movement devices 26 for better weight distribution. Both lifting / transverse movement devices 26 can then be moved up and down as a set-up axis by means of a common height adjustment mechanism 57.

Gemäß der Darstellung nach Fig. 7 als Schnitt entlang der Schnittlinie F-F in Fig. 6 ist die kombinierte Hub/Quer-Bewegungseinrichtung nach dem System aufgebaut, wie dies in der DE 32 33 428 C2 beschrieben ist. Anstelle der zu Fig. 3 beschriebenen Spindelantriebe ist beim Ausführungsbeispiel nach Fig. 7 ein erster Riemenantrieb 76 zur Durchführung der horizontalen Querbewegung (Pfeil 29) des Tragschlittens 49 vorgesehen, sowie ein zweiter Riemenantrieb 77, der die Hubbewegung der Hubsäule 30 über Umlenkrollen innerhalb des Schlittens 49 bzw. endseitig der Hubsäule 30 durchführt. Bezüglich der Funktionsweise wird ausdrücklich auf die zuvor genannte Patentschrift der Anmelderin verwiesen, dessen Inhalt zum Inhalt der vorliegenden Anmeldung gemacht wird.

1
GT-Presse
2
Pressenstraße
3 - 7
Bearbeitungsstufe
9
Schiebetisch
10
Unterwerkzeug
11
Oberwerkzeug
12
Pressenstößel
13
Kopfstück
14 - 19
Pressenständer
14' - 19'
Pressenständer
20
Werkstück
21
Saugerbalken/Quertraverse
22
Saugerspinnen/Magnethalter
23
Greiferanordnung
24
Transportsystem
25
Längstransporteinrichtung
26
Hub/Quer-Bewegungseinrichtung
27
Werkstücktransportrichtung
28
Vertikalrichtung
29
Querbewegung
30
Hubsäule
31
horizontaler Längsträger
32
Antriebsgehäuse
33
Seilzug oder Riemenantrieb
34
Seil/Riemen
35, 36
Endbereich von 31
37
Umlenkrolle
38
Antriebsritzel
39
Antriebsmotor
40
Lager
41
Führungsmittel
42
Schlitten
43
Seilzug/Riemenantrieb
44
Riemen
45, 45'
Umlenkrollen
46, 47
Pfeil
48
horizontales Führungsgehäuse
49
Tragschlitten
50
vertikale Führungsmittel
51
Antriebsmotor
52
Spindel
53
Spindelmotor
54
Antriebsmotor
55
Spindel
56
Konsole
57
Höhenverstellmechanismus
58
Spindelantrieb
59
Umlenkgetriebe
60
Antriebsmotor
61
Kardangelenk
62
Anschlußflansch
63
Kupplungseinrichtung
64
Schwenkkreuz
65
Lagerbolzen
66
oberer Arm
67
Anschlußbolzen
68
Querflansch
69
unterer Arm
70
Schwenkarm
71
Spindel
72
Spindelantrieb
74
Absteckhalter
75
Befestigungsträger
76
erster Riemenantrieb
77
zweiter Riemenantrieb
78, 79
Klemmeinrichtung
7 as a section along section line FF in FIG. 6, the combined lifting / transverse movement device is constructed according to the system, as described in DE 32 33 428 C2. Instead of the spindle drives described in relation to FIG. 3, a first belt drive 76 for carrying out the horizontal transverse movement (arrow 29) of the support slide 49 is provided in the exemplary embodiment according to FIG. 7, as well as a second belt drive 77 which controls the lifting movement of the lifting column 30 via deflection rollers within the slide 49 or at the end of the lifting column 30. With regard to the mode of operation, reference is expressly made to the applicant's aforementioned patent specification, the content of which is made the content of the present application.
1
GT press
2nd
Press line
3 - 7
Processing level
9
Sliding table
10th
Lower tool
11
Upper tool
12th
Press ram
13
Headpiece
14-19
Press stand
14 '- 19'
Press stand
20th
workpiece
21
Vacuum beam / crossbar
22
Vacuum spider / magnet holder
23
Gripper arrangement
24th
Transport system
25th
Longitudinal transport device
26
Stroke / cross-movement device
27
Workpiece transport direction
28
Vertical direction
29
Lateral movement
30th
Lifting column
31
horizontal side member
32
Drive housing
33
Cable or belt drive
34
Rope / strap
35, 36
End range from 31
37
Pulley
38
Drive pinion
39
Drive motor
40
camp
41
Leadership resources
42
carriage
43
Cable / belt drive
44
belt
45, 45 '
Pulleys
46, 47
arrow
48
horizontal guide housing
49
Carriage
50
vertical guide means
51
Drive motor
52
spindle
53
Spindle motor
54
Drive motor
55
spindle
56
console
57
Height adjustment mechanism
58
Spindle drive
59
Deflection gear
60
Drive motor
61
universal joint
62
Connecting flange
63
Coupling device
64
Swivel cross
65
Bearing bolt
66
upper arm
67
Connecting bolts
68
Cross flange
69
lower arm
70
Swivel arm
71
spindle
72
Spindle drive
74
Stake holder
75
Mounting bracket
76
first belt drive
77
second belt drive
78, 79
Clamping device

Claims (20)

  1. Transport system for transporting work pieces through processing stations in a press or pressing section, wherein each processing station (3 to 7) has at least one independent transport means (24) of its own for performing at least one transport movement around two axes, which receives and transports the work piece and performs a horizontal longitudinal movement in the transport direction of the work piece, characterised in that in order to perform a transport movement around two axes or three axes, a vertical movement aligned to the transport direction of the work piece may be performed by means of a hoisting mechanism, and/or a transverse movement to the direction of transport of the work piece may be performed by means of a closing/opening mechanism, and a longitudinal transport means (25) is provided with receiving means (21, 23) for the work piece (20), which serve as an alternative fastening of a cross beam (21) with a suction manifold (22) or for fastening a gripper arrangement (23).
  2. Transport system according to Claim 1, characterised in that the longitudinal transport means (25) performs a horizontal transport movement running in and contrary to the transport direction of the work piece (27), and is connected to a further transport means (26) mounted in the horizontal transverse movement means (48, 49) which is displaceable transversely to the transport direction of the work piece.
  3. Transport system according to Claim 2, characterised in that the further transport means (26) is constructed as a combined hoisting/transverse movement means (26) which includes a hoisting mechanism (30).
  4. Transport system according to Claim 1 or 2, characterised in that the horizontal longitudinal transport means (25) has a horizontally extending jib (31), which serves to transport the parts from one processing station to the next (3 to 7) and on which a transport cradle (42), which may be moved longitudinally on guides (41), is located to receive the work piece.
  5. Transport system according to Claim 4, characterised in that the horizontal jib (31) performs its own relative movement in and contrary to the transport direction (27) of the work piece in relation to the hoisting/transverse movement means (26) by means of guide means (40).
  6. Transport system according to Claim 4 or 5, characterised in that the longitudinal direction of the transport cradle (42) for receiving the work piece is achieved by means of a belt drive (44) guided via deflection rollers (45, 45') attached on the end side of the jib (31).
  7. Transport system according to Claim 5, characterised in that the longitudinal displacement of the jib (31) is achieved by means of a belt drive (34), a toothed rack drive or similar.
  8. Transport system according to Claim 2 or 3, characterised in that, on the one hand, the further transport means (26) comprises a hoisting mechanism constructed as a hoisting pillar (30), which is moved up and down by means of a hoisting drive in a receiving device constructed in particular as a support cradle (49); and that, on the other hand, the support cradle (49) may be actuated independently of the hoisting drive (54, 55) by means of a transverse drive (51 to 53) in a horizontal transverse guiding means (48), which is displaceable transversely to the transport direction of the work piece.
  9. Transport system according to one of Claims 2, 3 or 8, characterised in that the further transport means (26) is itself fastened to a vertically adjustable bracket (56), which may be moved up and down on guides in particular as an assembling means for tool change.
  10. Transport system according to Claim 8, characterised in that the hoisting/transverse movement means (26) with support cradle (49) for the hoisting pillar (30) has a horizontal drive (51 to 53) for the support cradle (49), which is constructed as a belt drive (76) or as a spindle drive (51 to 53), wherein programmable servo motors (51, 54) are provided for the transverse drive of the support cradle (49) supporting the hoisting pillar (30).
  11. Transport system according to Claim 8, characterised in that the hoisting/transverse movement unit (26) with support cradle (49) for the hoisting pillar (30) has a vertical drive, which is constructed as a cable or belt drive (77) or as a spline with gearwheel drive (54, 55) or similar, wherein programmable servo motors (54) are provided for vertical adjustment of the hoisting pillar (30).
  12. Transport system according to one of Claims 8-11, characterised in that the transversely displaceable support cradle (49) of the hoisting/transverse movement means (26) with the vertically moveable hoisting pillar (30) guided therein comprises a first traction means arrangement as a belt drive (76), which is provided with deflection rollers arranged on the end side of the hoisting/transverse movement unit (26) for a drivable traction means, by means of which the support cradle (49) is driven so as to be transversely displaced in relation to the transport direction of the work piece.
  13. Transport system according to one of Claims 8-12, characterised in that the transversely displaceable support cradle (49) of the hoisting/transverse movement unit (26) with the vertically moveable hoisting pillar (30) guided therein respectively comprises deflection rollers for a second traction means arrangement (77), whereby the respective traction means (77) is held in end bearings arranged at the end side of the hoisting/transverse movement unit (26) and may be driven in terms of a vertical adjustment of the hoisting pillar (30) in such a way that an upper and lower deflection loop, which is adjustable in length, is formed on the hoisting pillar (30).
  14. Transport system according to Claim 2 or 3, characterised in that the hoisting/transverse movement units (26) are respectively arranged between the pressing stands (14 to 19) of a multiple die press or between individual presses of a pressing section (2).
  15. Transport system according to one of Claims 4-14, characterised in that the transport cradle (42) has a coupling means (62, 63).
  16. Transport system according to Claim 15, characterised in that the coupling means comprises a connection flange (62) or a swivelling means (64), whereby in particular the connection flange (62) or the swivelling means (64) selectively has receiving means (67) for a cross beam (21) (suction beam) fitted with a suction manifold (22) or for a gripper strip with gripper elements (23).
  17. Transport system according to one of Claims 15 or 16, characterised in that the coupling means (62, 63) for the cross beam (21) or gripper elements (23) comprises a swivelling cross arrangement (64) as receiving flange for the suction beam (21, 22) or gripper elements (23), whereby the swivelling cross arrangement (64) is mounted via a swivel drive (72) to swivel around a horizontal bearing axis (65) by means of a spindle drive (71) with programmable motor or similar.
  18. Transport system according to one of the preceding claims, characterised in that the hoisting/transverse movement units (26) are arranged on both sides of the tool area and may be controlled independently of one another, whereby compensating joints (61) are provided to compensate an oblique position of the work piece (20) or the suction beam (21).
  19. Transport system according to Claim 18, characterised in that the hoisting/transverse movement units (26) arranged on both sides of the tool area perform a relative transverse movement within the transport step to further change the position of the work piece.
  20. Transport system according to one of the preceding claims, characterised in that the longitudinal transport units (25) are arranged on both sides of the tool area and perform different longitudinal movements.
EP95102384A 1994-03-12 1995-02-21 Transportsystem Expired - Lifetime EP0672480B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4408449A DE4408449A1 (en) 1994-03-12 1994-03-12 Transport system
DE4408449 1994-03-12

Publications (2)

Publication Number Publication Date
EP0672480A1 EP0672480A1 (en) 1995-09-20
EP0672480B1 true EP0672480B1 (en) 1997-10-15

Family

ID=6512642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95102384A Expired - Lifetime EP0672480B1 (en) 1994-03-12 1995-02-21 Transportsystem

Country Status (4)

Country Link
US (1) US5584205A (en)
EP (1) EP0672480B1 (en)
DE (2) DE4408449A1 (en)
ES (1) ES2110794T3 (en)

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EP1123761A2 (en) 2000-02-10 2001-08-16 Müller Weingarten AG Horizontal transport system
US6712198B2 (en) 2000-09-01 2004-03-30 Müller Weingarten AG Articulated arm transport system
US6715981B1 (en) 1999-03-17 2004-04-06 Müller Weingarten AG Transport system
DE10352982B4 (en) * 2003-11-13 2007-06-21 Müller Weingarten AG articulated arm
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EP1123761A2 (en) 2000-02-10 2001-08-16 Müller Weingarten AG Horizontal transport system
US6712198B2 (en) 2000-09-01 2004-03-30 Müller Weingarten AG Articulated arm transport system
DE10352982B4 (en) * 2003-11-13 2007-06-21 Müller Weingarten AG articulated arm
DE102004013825B4 (en) * 2003-11-13 2011-01-20 Müller Weingarten AG articulated arm

Also Published As

Publication number Publication date
US5584205A (en) 1996-12-17
EP0672480A1 (en) 1995-09-20
DE4408449A1 (en) 1995-09-14
DE59500780D1 (en) 1997-11-20
ES2110794T3 (en) 1998-02-16

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