EP0188776B1 - Transfer device for stepwise transfer of material and/or workpieces, especially in presses - Google Patents

Transfer device for stepwise transfer of material and/or workpieces, especially in presses Download PDF

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Publication number
EP0188776B1
EP0188776B1 EP85116243A EP85116243A EP0188776B1 EP 0188776 B1 EP0188776 B1 EP 0188776B1 EP 85116243 A EP85116243 A EP 85116243A EP 85116243 A EP85116243 A EP 85116243A EP 0188776 B1 EP0188776 B1 EP 0188776B1
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EP
European Patent Office
Prior art keywords
gripper rail
gripper
rail segments
transfer device
end portion
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Expired
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EP85116243A
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German (de)
French (fr)
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EP0188776A2 (en
EP0188776A3 (en
Inventor
Günter Zierpka
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Individual
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Individual
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Priority to AT85116243T priority Critical patent/ATE41112T1/en
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Publication of EP0188776A3 publication Critical patent/EP0188776A3/en
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Publication of EP0188776B1 publication Critical patent/EP0188776B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/05—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work specially adapted for multi-stage presses
    • B21D43/057—Devices for exchanging transfer bars or grippers; Idle stages, e.g. exchangeable

Definitions

  • the invention relates to a transfer device such. B. from DE-C-3 233 102 known for gradual material and / or workpiece transport, in particular in presses, with two extending along the transport path at a distance from each other in the direction of feed back and forth and transverse to their longitudinal extensions against each other driven gripper rails, each consisting of at least two fixed, but optionally separably interconnected gripper rail sections with form-fittingly interacting connecting means in the coupling position and with centering means in the region of the separation point.
  • Such tools are generally coupled with transfer systems for the step-by-step material and / or workpiece transport, the actual transfer device being assigned to the machine tool or press. It is therefore necessary to dissolve the gripper rails of such transfer systems into those rail sections that are assigned to the machine tool or press and those rail sections that are assigned to the tool.
  • the tool-side and machine-side gripper rail sections must be easily and quickly coupled and disconnectable again because the tool-side gripper rail sections must be moved out of the machine tool or the press with the tool.
  • DE-A-3 233 308 describes a press unit with gripper rails that can be exchanged when changing the tool, wherein a form-fitting, but detachable connection of tool-side and press-side gripper rail sections is brought about by interlocking tooth-like surfaces, in such a way that the form-fittingly interacting connecting means engage gripper rail sections on the tool side from above in corresponding counter contours of gripper rail sections on the press side and then be locked in this engagement position by additional locking means.
  • a device for releasably connecting gripper rail parts of the gripper rails in a transfer press which is designed as a hinged gripper rail lock.
  • this gripper rail lock fixes the gripper rail parts to be connected to one another in such a way that a separating gap remains between the respectively associated ends of the gripper rails, which gap is bridged by the hinged lock part.
  • DE-C-3 233 102 also describes a device for the releasable connection of gripper rail parts in a transfer press, in which gripper rail parts with mutually facing gripper rail parts are fastened to the front ends and a threaded sleeve provided with an external thread is fastened in a nut part is mounted, which can be screwed into the internal thread of the other nut part via a drive element fastened in or on the respective gripper rail.
  • a centering ring connected to the threaded sleeve comes into an end-face centering recess of the nut part arranged at the end of the other gripper rail part, so that at the end of the coupling process the gripper rail parts to be coupled are centered.
  • the connecting element is a tensioning rod which extends in the coupling position beyond the separation point between adjacent gripper rail sections and is axially movable and rotatable in the one gripper rail section with a holding surface of an end part of the other gripper rail section engages behind gripping head, which can be axially clamped between the gripper rail sections and brought out of engagement with the holding surface of the mentioned end part as a result of rotation about its longitudinal axis with its clamping head and can be pulled axially out of its engagement position projecting into the mentioned end part.
  • the coupling or uncoupling of a tool-side gripper rail section with at least one machine-side gripper rail section is accomplished in a simple manner, for example by the tensioning rod being inserted into a press after a tool equipped with tool-side gripper rail sections and accommodated on a shuttle table into a press with the gripper rail sections aligned with one another
  • Corresponding longitudinal recess, which extends in the end part of the tool-side gripper rail section, is retracted and then rotated with its clamping head into a locking position engaging behind the holding surface of the end part, the centering means assigned in the region of the separation point to the two gripper rail sections to be coupled in each case, precisely assigning them to one another parts to be coupled and as a result of tensioning the tension rod, a form-fitting, firm connection of the gripper bar Bee sections succeed in being able to absorb the bending moments that occur without any problems.
  • An expedient embodiment of the invention is characterized in that the clamping head of the clamping rod is designed like a hammer head and that the holding surface which is positively engaged by the latter in the coupling position in the end part of the one gripper rail section has a transverse recess through which the clamping head rotates from the position in an angular position relative to its clamping position End piece can be pulled out.
  • an unproblematic coupling succeeds in that the tension rod is axially displaced over the separation point between the two gripper rail sections to be coupled to one another in a position in which the clamping surfaces of the clamping head protrude beyond the corresponding holding surfaces of the end part of the one gripper rail section, whereupon only a rotation of the tension rod about its longitudinal axis is required in such a way that the tensioning surfaces of the tensioning head engage behind the holding surfaces in the end part.
  • the tensioning rod is clamped axially between the two gripper rail sections to be coupled with one another, a form-fitting, but at any time releasable coupling of the mentioned gripper rail sections is realized.
  • clamping head and the holding surface engaged by the latter in the coupling position have cooperating centering surfaces in the end part of a gripper rail section, which can advantageously be designed as clamping surfaces consisting of a cone and a counter-cone.
  • the tensioning rod is moved in a translatory and rotary manner and tensioned between the gripper rail sections to be coupled to one another
  • the tensioning rod with drive means for generating a translatory and rotary movement and for Applying an axial clamping force in the coupling position is operatively connected, each of which is assigned to the gripper section in which the clamping rod is rotatably and axially movably mounted.
  • the two gripper rail sections in the region of the separation point are provided with centering surfaces which cooperate in the coupling position and which can likewise consist of a cone and a counter-cone.
  • the press 10 which is only indicated in FIG. 1, has a changing table 12 which can be moved in a known manner on rails 11 between the position shown in the press and an unillustrated mounting position outside the press, on which a tool, which is only indicated schematically, is accommodated. Furthermore, the press is equipped with a likewise indicated transfer device 14, the two gripper rails which extend in parallel and at a distance from one another through the press and reciprocally according to the double arrow 15 and correspondingly guided by the double arrow 16 in a manner of no further interest here 17 has.
  • Each of these gripper rails consists of two gripper rail sections 18, 18 'assigned to the press 10 and a gripper rail section 19 which, with the two gripper rail sections guided in the press, at 20, 20' in a manner still to be described below, but optionally detachably coupled and on which Changing table 12 of the press 10 is assigned to the received tool.
  • FIG. 2 shows the fixed but optionally releasable connection of the press-side gripper rail section 18 to the tool-side gripper rail section 19.
  • the press-side and the tool-side gripper rail sections are equipped with centering means in the form of cones, the end face of the press-side gripper rail section 18 an inner cone 22 and the end face of the tool-side gripper rail section 19 has a matching outer cone 23.
  • An axially movable and rotatable tension rod 25 is used to produce the fixed but releasable coupling connection, which is received in a guide 26 in the press-side gripper rail section and can be actuated by means of arranged but not shown drive means.
  • the tension rod 25 extends with play through a longitudinal recess 28 in the region of the end piece 29 of the tool-side gripper rail section 19 and has at its end remote from the press-side gripper rail section 18 a hammer head-like clamping head 30, which is shown in FIGS 3 shown position engages behind a holding surface 31 within the end piece 29 of the tool-side gripper rail section and thereby holds the two gripper rail sections in their coupling position in the manner shown in FIG. 2.
  • the holding surface 31 in the end piece 29 and the clamping surface 32 of the clamping head 30 interacting therewith in the coupling position are designed as compressing cones.
  • the clamping force required to maintain the coupling position is applied by the actuating means for the clamping rod 25 already mentioned, which are accommodated in the press-side gripper rail section 18. Otherwise, the clamping rod 25 is axially movable and rotatably received in the press-side gripper rail section 18 by the actuating means mentioned, as indicated by the double arrow 33 and the rotary arrow 34 in FIG. 2, and the longitudinal recess 28 in the end part 29 of the gripper rail section 19 is transverse to one direction the coupling position shown in FIGS. 2 and 3 dimensioned such that the clamping head 30 of the clamping rod can be pulled out of the engagement position into the end part 29 by a corresponding rotational position through the longitudinal recess.
  • the clamping rod 25 must be moved axially from the illustrated clamping position according to arrow 33 in the direction of the gripper rail section 19 on the tool side so that the clamping head 30 with a in the end part 29 arranged contact surface 35 cooperates and push the tool-side gripper rail section 19 away from the press-side gripper rail section 18 to such an extent that the conical centering surfaces 22, 23 disengage in the region of the separation point between the two gripper rail sections.
  • the clamping rod 25 is brought into a rotational position according to the arrow 34, in which the clamping head arrives from a position which engages behind the holding surfaces 31 and can be pulled out of the engagement position in the end part 29 of the tool-side gripper rail section according to arrow 33 by the longitudinal recess 25 which is widened at an angle to the clamping position .
  • a press-side gripper rail section 18 'extending on the other side from the tool 13 must still be uncoupled.
  • the tool-side gripper rail section which has already been uncoupled on the first-mentioned side, is fixed to the tool by suitable means, so that due to an axial displacement of the tensioning rod of this end section, the restoring force which then becomes effective on the gripper rail section 18 ' also displaced by a predetermined axial dimension with the result that the centering surfaces effective between this gripper rail section and the tool-side gripper rail section fixed in the aforementioned manner come out of engagement.
  • the tool-side gripper rail section 19 is thus uncoupled from both press-side gripper rail sections 18, 18 '.
  • the two gripper rails of the transfer device are equipped with mutually identical means for firmly but optionally releasably connecting the gripper rail sections, and that in the region of the gripper rail sections removed from the drive of the transfer unit, connecting means of the same design are provided.
  • the gripper rail sections of this tool Coupled in an analogous manner to the machine-side gripper rail sections, but in the reverse order of the above-described processes, whereby instead of pushing away the gripper rail sections removed from the drive of the transfer unit as a result of an effective restoring force, the mentioned gripper rail sections now have to be used when clamping to the tool-side gripper rail sections.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Chain Conveyers (AREA)
  • Forging (AREA)
  • Advancing Webs (AREA)
  • Press Drives And Press Lines (AREA)
  • Automatic Assembly (AREA)
  • Reciprocating Conveyors (AREA)
  • Specific Conveyance Elements (AREA)
  • Intermediate Stations On Conveyors (AREA)

Abstract

1. Transfer device for stepwise transfer of material and/or workpieces, especially in presses, with two gripper rails (17) positioned longitudinally to the conveyance path at intervals, which are driven so as to be able to jointly move to and fro and across their longitudinal axes opposite to one another in the feeding direction, consisting of at least two fixed, but optionally separably coupled gripper rail segments (18, 19 and 18', 19' respectively) with couplings interacting formlockingly in coupling position and centering means in the disconnecting area, wherein the coupling means being a tie rod (25) axially rotating and pivoting on its mobile support on one of the gripper rail segments (18, 18') jutting out in coupling position beyond the disconnecting point (20, 20') between the adjoining gripper rail segments (18, 19) and (18', 19') respectively acting jointly with a grip (30) formlockingly back-gripping the gripping surface (31) of an end portion (29) of the other gripper rail segment (19), such tie rod being axially braceable between the gripper rail segments and its grip (30) being able to be thrown out of contact with the gripping surface (31) of the end portion (29) already referred to due to rotation around its longitudinal axis and which is axially removable from its gearing position extending into the already referred to end portion.

Description

Die Erfindung bezieht sich auf eine Transfereinrichtung wie z. B. aus der DE-C-3 233 102 bekannt zum schrittweisen Material-und/oder Werkstücktransport, insbesondere in Pressen, mit zwei sich längs des Transportweges im Abstand voneinander erstreckenden, in Vorschubrichtung gemeinsam hin- und her und quer zu ihren Längserstreckungen gegeneinander bewegbar angetriebenen Greiferschienen, die je aus wenigstens zwei fest, jedoch wahlweise trennbar miteinander verbundenen Greiferschienenabschnitten mit in der Kupplungslage formschlüssig zusammenwirkenden Verbindungsmitteln und mit Zentriermitteln im Bereich der Trennstelle bestehen.The invention relates to a transfer device such. B. from DE-C-3 233 102 known for gradual material and / or workpiece transport, in particular in presses, with two extending along the transport path at a distance from each other in the direction of feed back and forth and transverse to their longitudinal extensions against each other driven gripper rails, each consisting of at least two fixed, but optionally separably interconnected gripper rail sections with form-fittingly interacting connecting means in the coupling position and with centering means in the region of the separation point.

In der modernen Fertigungstechnik kommt es darauf an, Werkzeugwechsel ohne wesentliche Ausfallzeiten der Werkzeugmaschinen durchzuführen. Besondere Bedeutung kommt dem problemlosen und schnellen Wechsel der Werkzeuge in der Preßtechnik zu. Insoweit sind moderne Ziehpressen mit sog. Wechseltischen ausgerüstet, die auf Schienen in die Presse hinein- bzw. aus dieser herausgefahren werden können. Auf diesen Wechseltischen sind die Werkzeuge in bekannter, hier jedoch nicht weiter interessierender Weise aufgespannt.In modern manufacturing technology, it is important to carry out tool changes without significant machine tool downtimes. The problem-free and quick change of tools in pressing technology is of particular importance. In this respect, modern drawing presses are equipped with so-called changing tables, which can be moved into and out of the press on rails. The tools are mounted on these changing tables in a known, but not of further interest, manner.

Wenn sich ein derartiges, auf einem Wechseltisch aufgenommenes Werkzeug in einer Presse befindet, steht in der Regel ein zweiter Wechseltisch außerhalb der Presse, auf dem ein anderes Werkzeug aufgerüstet werden kann. Soll nun das in der Presse befindliche Werkzeug im Hinblick auf eine andere Verwendung der Presse gewechselt werden, so wird der das betreffende Werkzeug aufnehmende Wechseltisch aus der Presse heraus und der andere Wechseltisch mit dem für die nachfolgende Produktion bestimmten Werkzeug in die Presse hineingefahren. Die auf hier nicht weiter interessierenden Schienen verfahrbaren Wechseltische sind innerhalb der Presse durch geeignete Mittel, wie beispielsweise Konen, zentrierbar, was jedoch in bezug auf die vorliegende Erfindung hier ebenfalls nicht weiter interessiert.If such a tool, which is accommodated on a changing table, is located in a press, there is usually a second changing table outside the press, on which another tool can be upgraded. If the tool in the press is now to be changed with a view to another use of the press, the change table holding the tool in question is moved out of the press and the other change table with the tool intended for subsequent production is moved into the press. The changing tables which can be moved on rails which are of no further interest here can be centered within the press by suitable means, such as, for example, cones, which, however, is likewise of no further interest here in relation to the present invention.

Derartige Werkzeuge sind in aller Regel mit Transfersystemen zum schrittweisen Material-und/oder Werkstücktransport gekoppelt, wobei die eigentliche Transfereinrichtung der Werkzeugmaschine bzw. Presse zugeordnet ist. Es ist somit notwendig, die Greiferschienen derartiger Transfersysteme in solche Schienenabschnitte aufzulösen, die der Werkzeugmaschine bzw. Presse zugeordnet sind und solche Schienenabschnitte, die dem Werkzeug zugeordnet sind. Die werkzeugseitigen und maschinenseitigen Greiferschienenabschnitte müssen einfach und schnell miteinander kuppelbar und wieder trennbar sein, weil beim Werkzeugwechsel die werkzeugseitigen Greiferschienenabschnitte mit dem Werkzeug aus der Werkzeugmaschine bzw. der Presse herausgefahren werden müssen.Such tools are generally coupled with transfer systems for the step-by-step material and / or workpiece transport, the actual transfer device being assigned to the machine tool or press. It is therefore necessary to dissolve the gripper rails of such transfer systems into those rail sections that are assigned to the machine tool or press and those rail sections that are assigned to the tool. The tool-side and machine-side gripper rail sections must be easily and quickly coupled and disconnectable again because the tool-side gripper rail sections must be moved out of the machine tool or the press with the tool.

Lösungen dieses Problems sind schon in der Literatur im Zusammenhang mit Ziehpressen aufgezeigt worden, die allerdings weder hinsichtlich des vorrichtungstechnischen Aufbaues noch hinsichtlich ihrer Handhabbarkeit voll befriedigen können und daher verbesserungsbedürftig erscheinen.Solutions to this problem have already been shown in the literature in connection with drawing presses, which, however, cannot be fully satisfactory either in terms of the structure of the device or in terms of their manageability and therefore appear to be in need of improvement.

So ist in der DE-A-3 233 308 eine Presseneinheit mit beim Werkzeugwechsel austauschbaren Greiferschienen beschrieben, wobei eine formschlüssig feste, jedoch lösbare Verbindung werkzeugseitiger und pressenseitiger Greiferschienenabschnitte durch ineinandergreifende verzahnungsartige Flächen bewirkt wird, und zwar in der Weise, daß die formschlüssig zusammenwirkenden Verbindungsmittel werkzeugseitiger Greiferschienenabschnitte von oben in entsprechende Gegenkonturen pressenseitiger Greiferschienenabschnitte eingreifen und dann durch zusätzliche Verriegelungsmittel in dieser Eingriffslage verriegelt werden.For example, DE-A-3 233 308 describes a press unit with gripper rails that can be exchanged when changing the tool, wherein a form-fitting, but detachable connection of tool-side and press-side gripper rail sections is brought about by interlocking tooth-like surfaces, in such a way that the form-fittingly interacting connecting means engage gripper rail sections on the tool side from above in corresponding counter contours of gripper rail sections on the press side and then be locked in this engagement position by additional locking means.

Aus der DE-C-3 150 508 ist hingegen eine Vorrichtung zur lösbaren Verbindung von Greiferschienenteilen der Greiferschienen in einer Transfer-Presse bekannt, die als aufklappbares Greiferschienenschloß ausgebildet ist. Im geschlossenen Zustand fixiert dieses Greiferschienenschloß die miteinander zu verbindenden Greiferschienenteile in solcher Weise, daß zwischen den jeweils einander zugeordneten Enden der Greiferschienen ein Trennspalt verbleibt, der von dem aufklappbaren Schloßteil überbrückt wird.From DE-C-3 150 508, however, a device for releasably connecting gripper rail parts of the gripper rails in a transfer press is known, which is designed as a hinged gripper rail lock. In the closed state, this gripper rail lock fixes the gripper rail parts to be connected to one another in such a way that a separating gap remains between the respectively associated ends of the gripper rails, which gap is bridged by the hinged lock part.

In der DE-C-3 233 102 schließlich ist ebenfalls eine Vorrichtung zum lösbaren Verbinden von Greiferschienenteilen in einer Transfer-Presse beschrieben, bei der an den stirnseitigen Enden einander zugewandter Greiferschienenteile mit Innengewinde ausgebildete Mutterteile befestigt sind und in einem Mutterteil eine mit Außengewinde versehene Gewindehülse gelagert ist, die über ein in oder an der jeweiligen Greiferschiene befestigtes Antriebselement in das Innengewinde des anderen Mutterteils einschraubbar ist. Am Ende des Einschraubens der Gewindehülse in das Innengewinde des jeweils anderen Mutterteils gelangt ein mit der Gewindehülse verbundener Zentrierring in eine stirnseitige Zentrierausnehmung des am Ende des jeweils anderen Greiferschienenteils angeordneten Mutterteils, so daß am Ende des Kupplungsvorganges eine Zentrierung der miteinander zu kuppelnden Greiferschienenteile stattfindet.Finally, DE-C-3 233 102 also describes a device for the releasable connection of gripper rail parts in a transfer press, in which gripper rail parts with mutually facing gripper rail parts are fastened to the front ends and a threaded sleeve provided with an external thread is fastened in a nut part is mounted, which can be screwed into the internal thread of the other nut part via a drive element fastened in or on the respective gripper rail. At the end of screwing the threaded sleeve into the internal thread of the other nut part, a centering ring connected to the threaded sleeve comes into an end-face centering recess of the nut part arranged at the end of the other gripper rail part, so that at the end of the coupling process the gripper rail parts to be coupled are centered.

Allen vorbekannten Vorrichtungen gemeinsam sind deren komplizierter Aufbau und umständliche Handhabung. Die der Erfindung zugrundeliegende Aufgabe ist daher auf die Schaffung einer verbesserten. Transfereinrichtung mit fest, jedoch wahlweise trennbar kuppelbaren Greiferschienenabschnitten gerichtet, bei der einerseits das Kuppeln bzw. Entkuppeln der Greiferschienenabschnitte gegenüber dem Stande der Technik vereinfacht und die Gefahr von Verklemmungen der Kupplungsorgane beseitigt ist, bei der andererseits aber auch in den miteinander gekuppelten Greiferschienenabschnitten auftretende Biegemomente problemlos aufgenommen werden können.Common to all previously known devices is their complicated structure and cumbersome handling. The object underlying the invention is therefore to create an improved. Transfer device with fixed, but optionally separable detachable gripper rail sections directed, on the one hand, the coupling or uncoupling of the Gripper rail sections are simplified compared to the prior art and the risk of jamming of the coupling members is eliminated, but on the other hand bending moments occurring in the gripper rail sections coupled to one another can also be absorbed without problems.

Diese Aufgabe ist bei einer Transfereinrichtung der eingangs angegebenen Art erfindungsgemäß dadurch gelöst, daß als Verbindungselement eine sich in der Kupplungslage über die Trennstelle zwischen aneinandergrenzenden Greiferschienenabschnitten hinauserstreckenden, in dem einen Greiferschienenabschnitt axial beweglich und drehbar gelagerte Spannstange mit einem eine Haltefläche eines Endteils des anderen Greiferschienenabschnitts formschlüssig hintergreifenden Spannkopf dient, die zwischen den Greiferschienenabschnitten axial verspannbar und infolge Drehung um ihre Längsachse mit ihrem Spannkopf außer Eingriff mit der Haltefläche des genannten Endteils bringbar sowie axial aus ihrer in das erwähnte Endteil hineinragenden Eingriffslage herausziehbar ist.This object is achieved according to the invention in a transfer device of the type mentioned at the outset in that the connecting element is a tensioning rod which extends in the coupling position beyond the separation point between adjacent gripper rail sections and is axially movable and rotatable in the one gripper rail section with a holding surface of an end part of the other gripper rail section engages behind gripping head, which can be axially clamped between the gripper rail sections and brought out of engagement with the holding surface of the mentioned end part as a result of rotation about its longitudinal axis with its clamping head and can be pulled axially out of its engagement position projecting into the mentioned end part.

Bei einer so beschaffenen Transfereinrichtung gelingt das Kuppeln bzw. Entkuppeln eines werkzeugseitigen Greiferschienenabschnittes mit wenigstens einem maschinenseitigen Greiferschienenabschnitt in einfacher Weise, indem beispielsweise nach dem Einfahren eines mit werkzeugseitigen Greiferschienenabschnitten ausgerüsteten und auf einem Wechseltisch aufgenommenen Werkzeugs in eine Presse bei miteinander fluchtenden Greiferschienenabschnitten die Spannstange durch eine entsprechende Längsausnehmung, die sich in dem Endteil des werkzeugseitigen Greiferschienenabschnittes erstreckt, eingefahren und dann mit ihrem Spannkopf in eine die Haltefläche des Endteils hintergreifende Verriegelungsstellung gedreht wird, wobei mittels der im Bereich der Trennstelle den beiden jeweils zu kuppelnden Greiferschienenabschnitten zugeordneter Zentriermittel eine präzise Zuordnung der miteinander zu kuppelnden Teile sowie infolge Verspannens der Spannstange eine formschlüssig feste Verbindung der Greiferschienenabschnitte gelingt, die auch problemlos auftretende Biegemomente aufzunehmen vermag. Da es bei der erfindungsgemäßen Lösung nicht auf eine präzise Führung der Spannstange in dem Greiferschienenabschnitt ankommt, der eine in der Kupplungslage vom Spannkopf der Spannstange hintergriffene Haltefläche aufweist, können durch etwaig auftretende Biegemomente hervorgerufene elastische Verformungen der miteinander gekuppelten Greiferschienenabschnitte nicht zu Verklemmungen der Verbindungsmittel führen.In such a transfer device, the coupling or uncoupling of a tool-side gripper rail section with at least one machine-side gripper rail section is accomplished in a simple manner, for example by the tensioning rod being inserted into a press after a tool equipped with tool-side gripper rail sections and accommodated on a shuttle table into a press with the gripper rail sections aligned with one another Corresponding longitudinal recess, which extends in the end part of the tool-side gripper rail section, is retracted and then rotated with its clamping head into a locking position engaging behind the holding surface of the end part, the centering means assigned in the region of the separation point to the two gripper rail sections to be coupled in each case, precisely assigning them to one another parts to be coupled and as a result of tensioning the tension rod, a form-fitting, firm connection of the gripper bar Bee sections succeed in being able to absorb the bending moments that occur without any problems. Since the solution according to the invention does not depend on a precise guidance of the tensioning rod in the gripper rail section, which has a holding surface which is gripped behind by the tensioning head of the tensioning rod in the coupling position, elastic deformations of the mutually coupled gripper rail sections caused by possible bending moments cannot lead to jamming of the connecting means.

Eine zweckmäßige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß der Spannkopf der Spannstange hammerkopfartig ausgebildet ist und daß die von letzterem in der Kupplungslage formschlüssig hintergriffene Haltefläche im Endteil des einen Greiferschienenabschnitts eine Querausnehmung aufweist, durch die der Spannkopf in einer gegenüber seiner Spannlage verdrehten Winkelstellung aus dem Endstück herausziehbar ist.An expedient embodiment of the invention is characterized in that the clamping head of the clamping rod is designed like a hammer head and that the holding surface which is positively engaged by the latter in the coupling position in the end part of the one gripper rail section has a transverse recess through which the clamping head rotates from the position in an angular position relative to its clamping position End piece can be pulled out.

Bei dieser Ausgestaltung gelingt ein unproblematisches Kuppeln in der Weise, daß die Spannstange axial über die Trennstelle zwischen den beiden miteinander zu kuppelnden Greiferschienenabschnitten in eine Stellung verschoben wird, in der die Spannflächen des Spannkopfes über die korrespondierenden Halteflächen des Endteils des einen Greiferschienenabschnitts hinausragen, worauf es lediglich einer Verdrehung der Spannstange um ihre Längsachse dergestalt bedarf, daß die Spannflächen des Spannkopfes die Halteflächen im Endteil hintergreifen. Wenn nach der Herstellung eines derartig formschlüssigen Hintergreifens der Halteflächen des Endteils die Spannstange zwischen den beiden miteinander zu kuppelnden Greiferschienenabschnitten axial verspannt wird, ist eine formschlüssig feste, jedoch jederzeit lösbare Kupplung der genannten Greiferschienenabschnitte verwirklicht.In this embodiment, an unproblematic coupling succeeds in that the tension rod is axially displaced over the separation point between the two gripper rail sections to be coupled to one another in a position in which the clamping surfaces of the clamping head protrude beyond the corresponding holding surfaces of the end part of the one gripper rail section, whereupon only a rotation of the tension rod about its longitudinal axis is required in such a way that the tensioning surfaces of the tensioning head engage behind the holding surfaces in the end part. If after the production of such a form-fitting engagement of the holding surfaces of the end part, the tensioning rod is clamped axially between the two gripper rail sections to be coupled with one another, a form-fitting, but at any time releasable coupling of the mentioned gripper rail sections is realized.

Als zweckmäßig hat sich auch erwiesen, wenn der Spannkopf und die von letzterem in der Kupplungslage hintergriffene Haltefläche im Endteil des einen Greiferschienenabschnitts zusammenwirkende Zentrierflächen aufweisen, die mit Vorteil als aus einem Konus und einem Gegenkonus bestehende Spannflächen ausgebildet sein können.It has also proven to be expedient if the clamping head and the holding surface engaged by the latter in the coupling position have cooperating centering surfaces in the end part of a gripper rail section, which can advantageously be designed as clamping surfaces consisting of a cone and a counter-cone.

Obgleich es grundsätzlich gleichgültig ist, in welcher Weise die Spannstange translatorisch und rotatorisch bewegt und zwischen den miteinander zu kuppelnden Greiferschienenabschnitten verspannt wird, hat es sich gemäß einer weiteren Ausgestaltung als zweckmäßig erwiesen, wenn die Spannstange mit Antriebsmitteln zum Erzeugen einer translatorischen und rotatorischen Bewegung sowie zum Aufbringen einer axialen Spannkraft in der Kupplungslage in Wirkverbindung steht, die jeweils dem Greiferabschnitt zugeordnet sind, in dem die Spannstange drehbar und axial beweglich gelagert ist.Although it is fundamentally irrelevant in which way the tensioning rod is moved in a translatory and rotary manner and tensioned between the gripper rail sections to be coupled to one another, it has proven to be expedient according to a further embodiment if the tensioning rod with drive means for generating a translatory and rotary movement and for Applying an axial clamping force in the coupling position is operatively connected, each of which is assigned to the gripper section in which the clamping rod is rotatably and axially movably mounted.

Desweiteren hat es sich als vorteilhaft erwiesen, wenn die beiden Greiferschienenabschnitte im Bereich der Trennstelle mit in der Kupplungslage zusammenwirkenden Zentrierflächen versehen sind, die ebenfalls aus einem Konus und einem Gegenkonus bestehen können.Furthermore, it has proven to be advantageous if the two gripper rail sections in the region of the separation point are provided with centering surfaces which cooperate in the coupling position and which can likewise consist of a cone and a counter-cone.

Eine Ausführungsform der Erfindung soll nachstehend anhand der beigefügten Zeichnung erläutert werden. In schematischen Ansichten zeigen:

  • Fig. 1 in einer perspektivischen Darstellung ein auf einem Wechseltisch einer nur angedeuteten Presse aufgenommenes Werkzeug und eine mit letzterem zusammenwirkende Transfereinrichtung mit zwei sich parallel zueinander erstreckenden Greiferschienen, die jeweils aus der Presse zugeordneten Schienenabschnitten und aus mit letzteren fest, jedoch lösbar gekuppelten werkzeugseitigen Schienenabschnitten bestehen,
  • Fig. 2 in einer Detailansicht gemäß II in Fig. 1 die feste, jedoch wahlweise lösbare Verbindung von zwei Greiferschienenabschnitten in einer Längsschnittansicht entsprechend der Schnittlinie 11-11 in Fig. 3 und
  • Fig. 3 einen Querschnitt gemäß der Schnittlinie 111-111 in Fig. 2 durch ein Endteil des einen der miteinander gekuppelten Greiferschienenabschnitte.
An embodiment of the invention will be explained below with reference to the accompanying drawings. Schematic views show:
  • Fig. 1 in a perspective view on a changing table of a press, which is only indicated, and a transfer device cooperating with the latter, with two gripper rails extending parallel to one another, each consisting of rail sections assigned to the press and of tool-side rail sections firmly but detachably coupled to the press,
  • Fig. 2 in a detailed view according to II in Fig. 1, the fixed, but optionally releasable connection of two gripper rail sections in a longitudinal sectional view corresponding to section line 11-11 in Fig. 3 and
  • Fig. 3 shows a cross section along the section line 111-111 in Fig. 2 by an end part of one of the coupled gripper rail sections.

Die in Fig. 1 nur angedeutete Presse 10 besitzt einen in bekannter Weise auf Schienen 11 zwischen der gezeigten Stellung in der Presse und einer nicht veranschaulichten Montagestellung außerhalb der Presse verfahrbaren Wechseltisch 12, auf dem ein nur schematisch angedeutes Werkzeug aufgenommen ist. Ferner ist die Presse mit einer ebenfalls nur angedeuteten Transfereinrichtung 14 ausgerüstet, die zwei sich in Parallellage im Abstand voneinander durch die Presse hindurch erstreckende und gemäß Doppelpfeil 15 gemeinsam hin- und her sowie entsprechend dem Doppelpfeil 16 in hier nicht weiter interessierender Weise gegeneinander bewegbar geführte Greiferschienen 17 aufweist. Jede dieser Greiferschienen besteht aus zwei der Presse 10 zugeordneten Greiferschienenabschnitten 18,18' und einem Greiferschienenabschnitt 19, der mit den beiden in der Presse geführten Greiferschienenabschnitten bei 20, 20' in unten noch zu beschreibender Weise fest, jedoch wahlweise lösbar gekuppelt und dem auf dem Wechseltisch 12 der Presse 10 aufgenommenen Werkzeug zugeordnet ist.The press 10, which is only indicated in FIG. 1, has a changing table 12 which can be moved in a known manner on rails 11 between the position shown in the press and an unillustrated mounting position outside the press, on which a tool, which is only indicated schematically, is accommodated. Furthermore, the press is equipped with a likewise indicated transfer device 14, the two gripper rails which extend in parallel and at a distance from one another through the press and reciprocally according to the double arrow 15 and correspondingly guided by the double arrow 16 in a manner of no further interest here 17 has. Each of these gripper rails consists of two gripper rail sections 18, 18 'assigned to the press 10 and a gripper rail section 19 which, with the two gripper rail sections guided in the press, at 20, 20' in a manner still to be described below, but optionally detachably coupled and on which Changing table 12 of the press 10 is assigned to the received tool.

Die Ausschnittansicht an Fig. 2 zeigt die feste, jedoch wahlweise lösbare Verbindung des pressenseitigen Greiferschienenabschnittes 18 mit dem werkzeugseitigen Greiferschienenabschnitt 19. Im Bereich der Kontaktflächen sind die pressenseitigen und die werkzeugseitigen Greiferschienenabschnitte mit Zentriermitteln in Form von Konen ausgerüstet, wobei die Stirnfläche des pressenseitigen Greiferschienenabschnittes 18 einen Innenkonus 22 und die Stirnfläche des werkzeugseitigen Greiferschienenabschnittes 19 einen dazu passenden Außenkonus 23 aufweist. Zur Herstellung der festen, jedoch lösbaren Kupplungsverbindung dient eine axial bewegbare und drehbare Spannstange 25, die in einer Führung 26 im pressenseitigen Greiferschienenabschnitt aufgenommen und mittels in angeordneter, jedoch nicht weiter dargestellter Antriebsmittel betätigbar ist.2 shows the fixed but optionally releasable connection of the press-side gripper rail section 18 to the tool-side gripper rail section 19. In the area of the contact surfaces, the press-side and the tool-side gripper rail sections are equipped with centering means in the form of cones, the end face of the press-side gripper rail section 18 an inner cone 22 and the end face of the tool-side gripper rail section 19 has a matching outer cone 23. An axially movable and rotatable tension rod 25 is used to produce the fixed but releasable coupling connection, which is received in a guide 26 in the press-side gripper rail section and can be actuated by means of arranged but not shown drive means.

In der gezeigten Kupplungslage erstreckt sich die Spannstange 25 mit Spiel durch eine Längsausnehmung 28 im Bereich des Endstücks 29 des werkzeugseitigen Greiferschienenabschnittes 19 hindurch und besitzt an ihrem vom pressenseitigen Greiferschienenabschnitt 18 entfernten Ende einen hammerkopfartig ausgebildeten Spannkopf 30, der in der in den Fig. 2 und 3 gezeigten Lage eine Haltefläche 31 innerhalb des Endstücks 29 des werkzeugseitigen Greiferschienenabschnittes hintergreift und dadurch die beiden Greiferschienenabschnitte in der aus Fig. 2 ersichtlichen Weise in ihrer Kupplungslage hält. Die Haltefläche 31 im Endstück 29 und die in der Kupplungslage damit zusammenwirkende Spannfläche 32 des Spannkopfs 30 sind als zusammenpressende Konen ausgebildet. Die zum Aufrechterhalten der Kupplungslage erforderliche Spannkraft wird durch die bereits erwähnten, im pressenseitigen Greiferschienenabschnitt 18 aufgenommenen Betätigungsmittel für die Spannstange 25 aufgebracht. Im übrigen ist die Spannstange 25 durch die genannten Betätigungsmittel axialbewegbar und drehbar im pressenseitigen Greiferschienenabschnitt 18 aufgenommen, wie der Doppelpfeil 33 und der Drehpfeil 34 in Fig. 2 andeuten, und die Längsausnehmung 28 im Endteil 29 des.Greiferschienenabschnitts 19 ist in einer Richtung quer zu der in den Fig. 2 und 3 gezeigten Kupplungslage so bemessen, daß der Spannkopf 30 der Spannstange ein einer entsprechenden Drehstellung durch die Längsausnehmung aus der Eingriffslage in das Endteil 29 herausgezogen werden kann.In the coupling position shown, the tension rod 25 extends with play through a longitudinal recess 28 in the region of the end piece 29 of the tool-side gripper rail section 19 and has at its end remote from the press-side gripper rail section 18 a hammer head-like clamping head 30, which is shown in FIGS 3 shown position engages behind a holding surface 31 within the end piece 29 of the tool-side gripper rail section and thereby holds the two gripper rail sections in their coupling position in the manner shown in FIG. 2. The holding surface 31 in the end piece 29 and the clamping surface 32 of the clamping head 30 interacting therewith in the coupling position are designed as compressing cones. The clamping force required to maintain the coupling position is applied by the actuating means for the clamping rod 25 already mentioned, which are accommodated in the press-side gripper rail section 18. Otherwise, the clamping rod 25 is axially movable and rotatably received in the press-side gripper rail section 18 by the actuating means mentioned, as indicated by the double arrow 33 and the rotary arrow 34 in FIG. 2, and the longitudinal recess 28 in the end part 29 of the gripper rail section 19 is transverse to one direction the coupling position shown in FIGS. 2 and 3 dimensioned such that the clamping head 30 of the clamping rod can be pulled out of the engagement position into the end part 29 by a corresponding rotational position through the longitudinal recess.

Wenn bei der erfindungsgemäßen Transfereinrichtung, ausgehend von der in Fig. 2 der Zeichnung dargestellten Kupplungslage, entkuppelt werden soll, muß die Spannstange 25 aus der dargestellten Spannlage gemäß Pfeil 33 axial in Richtung auf den werkzeugseitigen Greiferschienenabschnitt 19 verfahren werden, damit der Spannkopf 30 mit einer im Endteil 29 angeordneten Kontaktfläche 35 zusammenwirkt und den werkzeugseitigen Greiferschienenabschnitt 19 um ein solches Maß von dem pressenseitigen Greiferschienenabschnitt 18 fortzuschieben, daß die als Konen ausgebildeten Zentrierflächen 22, 23 im Bereich der Trennstelle zwischen den beiden Greiferschienenabschnitten außer Eingriff gelangen. Danach wird die Spannstange 25 gemäß Drehpfeil 34 in eine Drehstellung gebracht, in der der Spannkopf aus einer die Halteflächen 31 hintergreifenden Lage gelangt und durch die im Winkel zur Spannstellung erweiterte Längsausnehmung 25 aus der Eingriffslage im Endteil 29 des werkzeugseitigen Greiferschienenabschnittes gemäß Pfeil 33 herausgezogen werden kann.If, in the transfer device according to the invention, starting from the coupling position shown in FIG. 2 of the drawing, is to be uncoupled, the clamping rod 25 must be moved axially from the illustrated clamping position according to arrow 33 in the direction of the gripper rail section 19 on the tool side so that the clamping head 30 with a in the end part 29 arranged contact surface 35 cooperates and push the tool-side gripper rail section 19 away from the press-side gripper rail section 18 to such an extent that the conical centering surfaces 22, 23 disengage in the region of the separation point between the two gripper rail sections. Thereafter, the clamping rod 25 is brought into a rotational position according to the arrow 34, in which the clamping head arrives from a position which engages behind the holding surfaces 31 and can be pulled out of the engagement position in the end part 29 of the tool-side gripper rail section according to arrow 33 by the longitudinal recess 25 which is widened at an angle to the clamping position .

Nachdem im Bereich der vorerwähnten Trennstelle die Greiferschienenabschnitte entkuppelt sind, muß ein sich auf der anderen Seite vom Werkzeug 13 forterstreckender pressenseitiger Greiferschienenabschnitt 18' noch entkuppelt werden. Dies geschieht in grundsätzlich gleicher Weise, jedoch mit der Maßgabe, daß zuvor der auf der erstgenannten Seite bereits entkuppelte werkzeugseitige Greiferschienenabschnitt durch geeignete Mittel am Werkzeug fixiert wird, so daß infolge einer Axialverschiebung der Spannstange dieses Endabschnittes die dann auf letzteren wirksamwerdende Rückstellkraft den Greiferschienenabschnitt 18' ebenfalls um ein vorbestimmtes Axialmaß verschiebt mit der Folge, daß die zwischen diesem Greiferschienenabschnitt und dem in der vorgenannten Weise fixierten werkzeugseitigen Greiferschienenabschnitt wirksamen Zentrierflächen außer Eingriff gelangen. Damit ist der werkzeugseitige Greiferschienenabschnitt 19 von beiden pressenseitigen Greiferschienenabschnitten 18, 18' entkuppelt.After in the area of the aforementioned Separation point, the gripper rail sections are uncoupled, a press-side gripper rail section 18 'extending on the other side from the tool 13 must still be uncoupled. This is done in basically the same way, but with the proviso that the tool-side gripper rail section, which has already been uncoupled on the first-mentioned side, is fixed to the tool by suitable means, so that due to an axial displacement of the tensioning rod of this end section, the restoring force which then becomes effective on the gripper rail section 18 ' also displaced by a predetermined axial dimension with the result that the centering surfaces effective between this gripper rail section and the tool-side gripper rail section fixed in the aforementioned manner come out of engagement. The tool-side gripper rail section 19 is thus uncoupled from both press-side gripper rail sections 18, 18 '.

Es versteht sich von selbst, daß die beiden Greiferschienen der Transfereinrichtung mit untereinander gleichen Mitteln zum festen, jedoch wahlweise lösbaren Verbinden der Greiferschienenabschnitte ausgerüstet sind und daß jeweils im Bereich der vom Antrieb der Transfereinheit entfernten Greiferschienenabschnitte gleichartig ausgebildete Verbindungsmittel vorgesehen sind.It goes without saying that the two gripper rails of the transfer device are equipped with mutually identical means for firmly but optionally releasably connecting the gripper rail sections, and that in the region of the gripper rail sections removed from the drive of the transfer unit, connecting means of the same design are provided.

Wenn das hinsichtlich der werkzeugseitigen Greiferschienenabschnitte in der oben erläuterten Weise von den pressenseitigen Greiferschienenabschnitten abgekuppelte Werkzeug samt Wechseltisch aus der Presse herausgefahren und durch ein anderes, ebenfalls auf einem Wechseltisch aufgenommenes und mit werkzeugseitigen Greiferschienenabschnitten ausgerüstetes Werkzeug in die Presse eingefahren ist, werden die Greiferschienenabschnitte dieses Werkzeugs in sinngemäß gleicher Weise mit den maschinenseitigen Greiferschienenabschnitten gekuppelt, jedoch in umgekehrter Reihenfolge der oben erläuterten Vorgänge, wobei statt des Wegschiebens der vom Antrieb der Transfereinheit entfernten Greiferschienenabschnitten infolge einer wirksamwerdenden Rückstellkraft nun die genannten Greiferschienenabschnitte beim Spannen an die werkzeugseitigen Greiferschienenabschnitte herangezogen werden müssen. Sinngemäß gleiches gilt dann für das Kuppeln der werkzeugseitigen Greiferschienenabschnitte mit den pressenseitigen Greiferschienenabschnitten, die auf der Antriebsseite der Transfereinrichtung angeordnet sind.If the tool uncoupled from the press-side gripper rail sections with regard to the tool-side gripper rail sections and the shuttle table is moved out of the press in the manner explained above and is inserted into the press by another tool, also accommodated on a shuttle table and equipped with tool-side gripper rail sections, the gripper rail sections of this tool Coupled in an analogous manner to the machine-side gripper rail sections, but in the reverse order of the above-described processes, whereby instead of pushing away the gripper rail sections removed from the drive of the transfer unit as a result of an effective restoring force, the mentioned gripper rail sections now have to be used when clamping to the tool-side gripper rail sections. The same applies analogously to the coupling of the gripper rail sections on the tool side with the gripper rail sections on the press side, which are arranged on the drive side of the transfer device.

Claims (9)

1. Transfer device for stepwise transfer of material and/or workpieces, especially in presses, with two gripper rails (17) positioned longitudinally to the conveyance path at intervals, which are driven so as to be able to jointly move to and fro and across their longitudinal axes opposite to one another in the feeding direction, consisting of at least two fixed, but optionally separably coupled gripper rail segments (18, 19 and 18', 19' respectively) with couplings interacting formlockingly in coupling position and centering means in the disconnecting area, wherein the coupling means being a tie rod (25) axially rotating and pivoting on its mobile support on one of the gripper rail segments (18, 18') jutting out in coupling position beyond the disconnecting point (20, 20') between the adjoining gripper rail segments (18,19) and (18', 19') respectively acting jointly with a grip (30) formlockingly back-gripping the gripping surface (31) of an end portion (29) of the other gripper rail segment (19), such tie rod being axially braceable between the gripper rail segments and its grip (30) being able to be thrown out of contact with the gripping surface (31) of the end portion (29) already referred to due to rotation around its longitudinal axis and which is axially removable from its gearing position extending into the already referred to end portion.
2. Transfer device as defined in claim 1, wherein the grip (30) of the tie rod (25) being shaped like a hammer head and by the supporting surface (31) formlockingly back-gripped in coupling position by the latter having a transverse recess (28) in the end portion (29) of one of the gripper rail segments (19), where the grip can be pulled out of the end portion in an angular position torsioned as compared with its clamping position.
3. Transfer device as defined in claims 1 or 2, wherein the grip (30) and the supporting surface formlockingly back-gripped in coupling position by the latter displaying interacting centering surfaces (31, 32) in the end portion (29) of one of the gripper rail segments (19).
4. Transfer device as defined in claim 3, wherein the interacting centering surfaces being gripping surfaces consisting of a cone (32) and a countercone (31).
5. Transfer device as defined in one of the claims 1 to 4, wherein the tie rod (25) being in coupling position in interaction with driving means to create a translatory and a rotary movement and to apply an axial clamping power, and which are assigned to the gripper rail segment (18, 18') where the tie rod has axially rotating and pivoting mobile support.
6. Transfer device as defined in one of the claims 1 to 6, wherein said both gripper rail segments (18,19) and (18', 19') respectively being equipped with centering surfaces (22, 23) interacting in coupling position in the region of the disconnecting point (20, 20').
7. Transfer device as defined in claim 6, wherein said interacting centering surfaces of the reciprocally coupling gripper rail segments consisting of a cone (22) and a countercone (23).
EP85116243A 1985-01-22 1985-12-19 Transfer device for stepwise transfer of material and/or workpieces, especially in presses Expired EP0188776B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85116243T ATE41112T1 (en) 1985-01-22 1985-12-19 TRANSFER DEVICE FOR STEP-BY-STEP MATERIAL AND/OR WORKPIECE TRANSPORT, PARTICULARLY IN PRESSES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3501946 1985-01-22
DE19853501946 DE3501946A1 (en) 1985-01-22 1985-01-22 TRANSFER DEVICE FOR STEP-BY-STEP MATERIAL AND / OR WORKPIECE TRANSPORT, IN PARTICULAR IN PRESSES

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EP0188776A2 EP0188776A2 (en) 1986-07-30
EP0188776A3 EP0188776A3 (en) 1987-03-25
EP0188776B1 true EP0188776B1 (en) 1989-03-08

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AT (1) ATE41112T1 (en)
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Publication number Publication date
CA1253530A (en) 1989-05-02
EP0188776A2 (en) 1986-07-30
ATE41112T1 (en) 1989-03-15
EP0188776A3 (en) 1987-03-25
DE3501946C2 (en) 1987-10-29
DE3568542D1 (en) 1989-04-13
DE3501946A1 (en) 1986-07-24

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