EP0135734B1 - Method and device for cancelling the blocking of punched-bag stacks - Google Patents

Method and device for cancelling the blocking of punched-bag stacks Download PDF

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Publication number
EP0135734B1
EP0135734B1 EP19840109183 EP84109183A EP0135734B1 EP 0135734 B1 EP0135734 B1 EP 0135734B1 EP 19840109183 EP19840109183 EP 19840109183 EP 84109183 A EP84109183 A EP 84109183A EP 0135734 B1 EP0135734 B1 EP 0135734B1
Authority
EP
European Patent Office
Prior art keywords
stacks
stack
diecutting
punched
blocking
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
Application number
EP19840109183
Other languages
German (de)
French (fr)
Other versions
EP0135734A1 (en
Inventor
Fritz Achelpohl
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP0135734A1 publication Critical patent/EP0135734A1/en
Application granted granted Critical
Publication of EP0135734B1 publication Critical patent/EP0135734B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/142—Cutting, e.g. perforating, punching, slitting or trimming using presses or dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • B31B70/988—Assembling or block-forming of bags; Loading bags on a mandrel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/30—Breaking or tearing apparatus
    • Y10T225/336—Conveyor diverter for moving work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49815—Disassembling
    • Y10T29/49822—Disassembling by applying force
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53683—Spreading parts apart or separating them from face to face engagement

Definitions

  • the invention relates to a method for removing the blocking of the cut edges caused by punching stacks from flat-lying workpieces made of thermoplastic, preferably plastic bags, and a device for carrying out this method.
  • So-called shirt pockets are produced, for example, in the manner known from DE-OS 2 915 689 in that the shirt cutouts are punched out from stacks of tubular sections provided with side gussets, which are provided at the end with transverse weld seams.
  • the individual bags in the stack block with one another and / or with one another in the region of the cut edges. This blocking is noticeable when the bags are removed from the stack and also when the individual bags are opened. Unwanted blocking of stacked plastic bags can also occur if, for example, they are provided with finger hole punchings in the stack.
  • the object of the invention is therefore to remove blockages of workpieces made of thermoplastic plastic punched in the stack in a simple manner after the punching.
  • this object is achieved in a method of the type specified in the introduction in that the stacks are grasped at their front ends and, after punching, are drawn over at least their rear regions provided with the punched-out areas with progressive deflection over at least one supporting edge. Due to the increasing radius of curvature of the individual bags with increasing distance from the supporting edge, they experience a relative displacement in the stack, which, supported by the progressive bending of the stack, leads to a lifting of the blocking of the cut edges.
  • a device known, for example, from DE-OS 2 915 689, is developed according to the invention for carrying out the method according to the invention in such a way that the conveying device consists of a carriage with the clamping jaws clamping in each case the die to be punched, which between its position in which the stacks are received and in which they are emitted is movable, and that two rods are arranged in the conveying direction of the carriage behind the punching tool below the conveying plane transversely to the conveying direction, between which a rod that can be raised and lowered and passes through the conveying plane can be moved.
  • the punched bag block is pulled by the carriage in a double-S-shaped manner between the deflection edges formed by the bars, so that blocked cutting edges are caused by correspondingly walking through the stack and thereby solve resulting relative displacements of the individual layers in the stack.
  • the device consists of two side frames 1 arranged at a distance from one another, of which only the rear one is shown. Between the two side frames 1, the two end-side deflecting rollers 2 and 3 of a feed conveyor belt 4 are mounted, through which a stack of bags can be fed.
  • a shaft 5 is provided adjacent to the lower deflection roller 2 and carries a toothed belt wheel 6 at both ends. Two toothed belts 7 are placed around these two toothed belt wheels 6, which, in addition to the toothed belt wheels 6, loop around two toothed belt wheels 7 'which are placed on the ends of a further shaft 8.
  • One of the shafts 5 or 8 is drivably mounted in a manner not shown.
  • a carriage 9 is fastened to the upper run of the toothed belt 7, the rollers 10 of which are movably supported in lateral guide slots 11 of the side frames 1.
  • a punching device 12 is provided, which consists of a lower fixed counter knife 13 and an upper punch 15 which can be actuated by a piston-cylinder unit 14. When the punch 15 is raised, the carriage 9 can be passed between the punch 15 and the counter knife 13.
  • the carriage 9 consists of a base frame 16 which has an upper carrier plate 17.
  • a holder 18 is welded to this carrier plate 17, the upper end of which is connected in an articulated manner to the piston rod 19 of a piston-cylinder unit 20.
  • the cylinder 21 of this piston-cylinder unit 20 is connected by means of a bracket 22 to a bracket 23 which is welded to the carrier plate 17.
  • Two levers 24, which are arranged at a distance from one another and which carry a crossbar 25, are fastened to the tab 22.
  • a plurality of downwardly projecting clamping pins 26 are screwed into this crossbar 25. In the position shown in full lines, these clamping pins are supported on a counter-holder 27 which is firmly connected to the frame 16 of the carriage 9.
  • the clamping pins 26 move into the raised position shown with dashed lines. If a stack of bags is now transported from the feed belt 4, the carriage 19 travels between the raised punch 15 and the fixed counter knife 13 to the left until shortly before the end of the feed belt 4. After the clamping pins 26 have been lifted, the bag package brought in is then removed from the feed belt 4 with its moved front area between the counter holder 27 and the clamping pin 26 and then the clamping pin 26 closed.
  • the carriage 9 then moves into the position shown in FIG. 1, so that the rear end of the stack of bags 28 lies between the fixed counter knife 13 and the stamp 15.
  • the distance between the fixed counter knife 13 and the outlet end of the conveyor belt 4 is by a support table 29 bridged, which is rotatably mounted about the axis 30 and is supported with its other end on a spring 31.
  • the end of the support table 29 lying opposite the axis 30 engages in regions around the counter knife 13 and serves as an ejector after the punching process.

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  • Making Paper Articles (AREA)
  • Packaging Of Special Articles (AREA)
  • Pile Receivers (AREA)
  • Details Of Cutting Devices (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Aufheben der durch Stanzen von Stapeln aus flachliegenden Werkstücken aus thermoplastischem Kunststoff, vorzugsweise Kunststoffbeuteln, bewirkten Verblockungen der Schnittkanten sowie eine Vorrichtung zur Durchführung dieses Verfahrens.The invention relates to a method for removing the blocking of the cut edges caused by punching stacks from flat-lying workpieces made of thermoplastic, preferably plastic bags, and a device for carrying out this method.

Sogenannte Hemdchenbeutel werden beispielsweise in der aus der DE-OS 2 915 689 bekannten Weise dadurch hergestellt, dass aus Stapeln von mit Seitenfalten versehenen Schlauchabschnitten, die endseitig mit Querschweissnähten versehen sind, die Hemdchenausschnitte ausgestanzt werden. Die Praxis hat gezeigt, dass bei den entsprechenden Stanzschnitten die einzelnen Beutel in dem Stapel miteinander und/oder untereinander im Bereich der Schnittkanten verblocken. Diese Verblockung macht sich bei der Entnahme der Beutel von dem Stapel und auch beim Öffnen der einzelnen Beutel störend bemerkbar. Unerwünschte Verblockungen von gestapelten Kunststoffbeuteln können auch dann entstehen, wenn diese beispielsweise im Stapel mit Grifflochausstanzungen versehen werden.So-called shirt pockets are produced, for example, in the manner known from DE-OS 2 915 689 in that the shirt cutouts are punched out from stacks of tubular sections provided with side gussets, which are provided at the end with transverse weld seams. Practice has shown that in the case of the corresponding punch cuts, the individual bags in the stack block with one another and / or with one another in the region of the cut edges. This blocking is noticeable when the bags are removed from the stack and also when the individual bags are opened. Unwanted blocking of stacked plastic bags can also occur if, for example, they are provided with finger hole punchings in the stack.

Aufgabe der Erfindung ist es daher, Verblockungen von im Stapel gestanzten Werkstücken aus thermoplastischem Kunststoff nach dem Stanzen in einfacher Weise wieder aufzuheben.The object of the invention is therefore to remove blockages of workpieces made of thermoplastic plastic punched in the stack in a simple manner after the punching.

Erfindungsgemäss wird diese Aufgabe bei einem Verfahren der eingangs angegebenen Art dadurch gelöst, dass die Stapel an ihren vorderen Enden erfasst und nach dem Stanzen zumindest über ihren hinteren, mit den Ausstanzungen versehenen Bereichen unter fortschreitender Durchbiegung über mindestens eine Stützkante gezogen werden. Aufgrund des sich mit zunehmendem Abstand von der Stützkante vergrössernden Krümmungsradius der einzelnen Beutel erfahren diese in dem Stapel eine Relativverschiebung zueinander, die unterstützt durch die fortschreitende Durchbiegung des Stapels erzeugte Walkwirkung zu einer Aufhebung der Verblockung der Schnittkanten führt.According to the invention, this object is achieved in a method of the type specified in the introduction in that the stacks are grasped at their front ends and, after punching, are drawn over at least their rear regions provided with the punched-out areas with progressive deflection over at least one supporting edge. Due to the increasing radius of curvature of the individual bags with increasing distance from the supporting edge, they experience a relative displacement in the stack, which, supported by the progressive bending of the stack, leads to a lifting of the blocking of the cut edges.

Eine beispielsweise aus der DE-OS 2 915 689 bekannte Vorrichtung wird erfindungsgemäss zur Durchführung des erfindungsgemässen Verfahrens in der Weise weitergebildet, dass die Fördereinrichtung aus einem Wagen mit den jeweils zu stanzenden Stapel festklemmenden Klemmbacken besteht, der zwischen seiner die Stapel aufnehmenden und diese abgebenden Stellung verfahrbar ist, und dass in Förderrichtung des Wagens hinter dem Stanzwerkzeug unterhalb der Förderebene quer zur Förderrichtung zwei Stangen angeordnet sind, zwischen die eine heb- und absenkbare, die Förderebene durchsetzende Stange einfahrbar ist. Wird nach dem Stanzen die heb- und absenkbare Stange zwischen die gestellfesten Stangen abgesenkt, wird der gestanzte Beutelblock von dem Wagen doppel-S-förmig zwischen den durch die Stangen gebildeten Umlenkkanten hindurchgezogen, so dass verblockte Schnittkanten durch entsprechendes Durchwalken des Stapels und die sich dabei ergebenden Relativverschiebungen der einzelnen Lagen in dem Stapel lösen.A device known, for example, from DE-OS 2 915 689, is developed according to the invention for carrying out the method according to the invention in such a way that the conveying device consists of a carriage with the clamping jaws clamping in each case the die to be punched, which between its position in which the stacks are received and in which they are emitted is movable, and that two rods are arranged in the conveying direction of the carriage behind the punching tool below the conveying plane transversely to the conveying direction, between which a rod that can be raised and lowered and passes through the conveying plane can be moved. If, after punching, the bar that can be raised and lowered is lowered between the bars fixed to the frame, the punched bag block is pulled by the carriage in a double-S-shaped manner between the deflection edges formed by the bars, so that blocked cutting edges are caused by correspondingly walking through the stack and thereby solve resulting relative displacements of the individual layers in the stack.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert.An embodiment of the invention is explained below with reference to the drawing.

In dieser zeigt

  • Fig. 1 die erfindungsgemässe Einrichtung unmittelbar vor dem Stanzvorgang und
  • Fig. 2 die in Fig. 1 dargestellte Einrichtung nach dem Stanzvorgang und aus dem Stanzbereich herausgezogenen Beutelstapel.
In this shows
  • Fig. 1 shows the inventive device immediately before the punching process and
  • Fig. 2 shows the device shown in Fig. 1 after the punching process and the stack of bags pulled out of the punching area.

Die Vorrichtung besteht aus zwei mit Abstand zueinander parallel angeordneten Seitengestellen 1, von denen nur das hintere dargestellt ist. Zwischen den beiden Seitengestellen 1 sind die beiden endseitigen Umlenkwalzen 2 und 3 eines Zuführförderbandes 4 gelagert, durch das ein Beutelstapel zugeführt werden kann. Der unteren Umlenkwalze 2 benachbart ist eine Welle 5 vorgesehen, die beidendig je ein Zahnriemenrad 6 trägt. Um diese beiden Zahnriemenräder 6 sind zwei Zahnriemen 7 gelegt, die neben den Zahnriemenrädern 6 zwei Zahnriemenräder 7' umschlingen, die auf die Enden einer weiteren Welle 8 aufgesetzt sind. Eine der Wellen 5 oder 8 ist auf nicht dargestellte Weise antreibbar gelagert.The device consists of two side frames 1 arranged at a distance from one another, of which only the rear one is shown. Between the two side frames 1, the two end-side deflecting rollers 2 and 3 of a feed conveyor belt 4 are mounted, through which a stack of bags can be fed. A shaft 5 is provided adjacent to the lower deflection roller 2 and carries a toothed belt wheel 6 at both ends. Two toothed belts 7 are placed around these two toothed belt wheels 6, which, in addition to the toothed belt wheels 6, loop around two toothed belt wheels 7 'which are placed on the ends of a further shaft 8. One of the shafts 5 or 8 is drivably mounted in a manner not shown.

Mit dem Obertrum des Zahnriemens 7 ist ein Wagen 9 befestigt, dessen Laufrollen 10 in seitlichen Führungsschlitzen 11 der Seitengestelle 1 verfahrbar gelagert sind. Zwischen den beiden Zahnriemen ist in der Nähe der Umlenkwalzen 2, 3 des Zuführbandes 4 eine Stanzeinrichtung 12 vorgsehen, die aus einem unteren festen Gegenmesser 13 und einem oberen, von einer Kolbenzylindereinheit 14 betätigbaren Stempel 15 besteht. Bei angehobenem Stempel 15 kann der Wagen 9 zwischen Stempel 15 und Gegenmesser 13 hindurchgefahren werden.A carriage 9 is fastened to the upper run of the toothed belt 7, the rollers 10 of which are movably supported in lateral guide slots 11 of the side frames 1. Between the two toothed belts, in the vicinity of the deflection rollers 2, 3 of the feed belt 4, a punching device 12 is provided, which consists of a lower fixed counter knife 13 and an upper punch 15 which can be actuated by a piston-cylinder unit 14. When the punch 15 is raised, the carriage 9 can be passed between the punch 15 and the counter knife 13.

Aus den Figuren wird deutlich, dass der Wagen 9 aus einem Grundrahmen 16 besteht, der eine obere Trägerplatte 17 aufweist. Mit dieser Trägerplatte 17 ist ein Halter 18 verschweisst, dessen oberes Ende mit der Kolbenstange 19 einer Kolbenzylindereinheit 20 gelenkig verbunden ist. Der Zylinder 21 dieser Kolbenzylindereinheit 20 ist vermittels einer Lasche 22 mit einer Konsole 23 verbunden, die mit der Trägerplatte 17 verschweisst ist. An der Lasche 22 sind zwei im Abstand zueinander angeordnete Hebel 24 befestigt, die eine Quertraverse 25 tragen. In diese Quertraverse 25 sind mehrere nach unten ragende Klemmzapfen 26 eingeschraubt. Diese Klemmzapfen stützen sich in der mit vollen Linien dargestellten Stellung an einem Gegenhalter 27 ab, der mit dem Rahmen 16 des Wagens 9 fest verbunden ist.It is clear from the figures that the carriage 9 consists of a base frame 16 which has an upper carrier plate 17. A holder 18 is welded to this carrier plate 17, the upper end of which is connected in an articulated manner to the piston rod 19 of a piston-cylinder unit 20. The cylinder 21 of this piston-cylinder unit 20 is connected by means of a bracket 22 to a bracket 23 which is welded to the carrier plate 17. Two levers 24, which are arranged at a distance from one another and which carry a crossbar 25, are fastened to the tab 22. A plurality of downwardly projecting clamping pins 26 are screwed into this crossbar 25. In the position shown in full lines, these clamping pins are supported on a counter-holder 27 which is firmly connected to the frame 16 of the carriage 9.

Wird die Kolbenzylindereinheit 20 mit Druck beaufschlagt, bewegen sich die K!emmzapfen 26 in die mit gestrichelten Linien dargestellte angehobene Position. Wird nun vom Zuführband 4 ein Beutelstapel herantransportiert, fährt derWagen 19 zwischen dem angehobenen Stempel 15 und dem festen Gegenmesser 13 hindurch nach links bis kurz vor das Ende des Zuführbandes 4. Nach dem Anheben der Klemmzapfen 26 wird dann das herangeführte Beutelpaket vom Zuführband 4 mit seinem vorderen Bereich zwischen Gegenhalter 27 und Klemmzapfen 26 gefahren und danach die Klemmzapfen 26 geschlossen.If the piston-cylinder unit 20 is pressurized, the clamping pins 26 move into the raised position shown with dashed lines. If a stack of bags is now transported from the feed belt 4, the carriage 19 travels between the raised punch 15 and the fixed counter knife 13 to the left until shortly before the end of the feed belt 4. After the clamping pins 26 have been lifted, the bag package brought in is then removed from the feed belt 4 with its moved front area between the counter holder 27 and the clamping pin 26 and then the clamping pin 26 closed.

Danach fährt der Wagen 9 in die in Fig. 1 dargestellte Lage, so dass das hintere Ende des Beutelstapels 28 zwischen dem festen Gegenmesser 13 und dem Stempel 15 liegt. Der Abstand zwischen dem festen Gegenmesser 13 und dem auslaufseitigen Ende des Förderbandes 4 ist durch einen Stütztisch 29 überbrückt, der um die Achse 30 drehbar gelagert ist und sich mit seinem anderen Ende auf einer Feder 31 abstützt. Das der Achse 30 entgegengesetzt liegende Ende des Stütztisches 29 umgreift bereichsweise das Gegenmesser 13 und dient nach dem Stanzvorgang als Auswerfer.The carriage 9 then moves into the position shown in FIG. 1, so that the rear end of the stack of bags 28 lies between the fixed counter knife 13 and the stamp 15. The distance between the fixed counter knife 13 and the outlet end of the conveyor belt 4 is by a support table 29 bridged, which is rotatably mounted about the axis 30 and is supported with its other end on a spring 31. The end of the support table 29 lying opposite the axis 30 engages in regions around the counter knife 13 and serves as an ejector after the punching process.

In der in Fig. 2 dargestellten Lage wird der Beutelstapel 28 zwischen dem Wagen 9 und der Stanzeinrichtung 12 noch durch einen festen Tisch 32 und einen gegen Federkraft absenkbaren Tisch 33 abgestützt. Zwischen den beiden Tischen 32 und 33 sind zwei mit Abstand, aber parallel zueinander vorgesehene Rundprofile 34, 35 vorgesehen, die mit den Seitengestellen 1 verbunden sind. In den von diesen beiden Rundprofilen 34 und 35 gebildeten, quer zur Transportrichtung verlaufenden Spalt ist eine Druckstange 36 mittels zweier Kolbenzylindereinheiten 37 einfahrbar, so dass der Stapel nach dem Einfahren der Druckstange in den Spalt die in Fig. 2 dargestellte Lage einnimmt. Nachdem dies geschehen ist, fährt der Wagen aus der in Fig. 2 dargestellten Lage bis zum Ende des Führungsschlitzes 11 nach rechts, wodurch der Stapel durch die beiden Rundprofile 34 und 35 und die Druckstange 36 gewalkt wird. Durch dieses Walken entstehen zwischen den einzelnen Beuteln des Stapels Relativbewegungen, wodurch die durch den Stanzvorgang erzeugte Kaltverblockung wieder aufgehoben wird.In the position shown in FIG. 2, the stack of bags 28 is still supported between the carriage 9 and the punching device 12 by a fixed table 32 and a table 33 that can be lowered against spring force. Between the two tables 32 and 33 there are two round profiles 34, 35 which are spaced but parallel to one another and which are connected to the side frames 1. In the gap formed by these two round profiles 34 and 35 and extending transversely to the direction of transport, a push rod 36 can be moved in by means of two piston-cylinder units 37, so that the stack assumes the position shown in FIG. 2 after the push rod has been pushed into the gap. After this has been done, the carriage moves from the position shown in FIG. 2 to the right up to the end of the guide slot 11, as a result of which the stack is tumbled through the two round profiles 34 and 35 and the push rod 36. This flexing creates relative movements between the individual bags of the stack, as a result of which the cold blocking produced by the punching process is canceled again.

Claims (2)

1. A process of eliminating the joints formed by blocking between cut edges by the diecutting of stacks of flat workpieces of synthetic thermoplastics, preferably plastic bags, characterized in that the stacks are engaged at their leading edges and after the diecutting at least their trailing portions provided with the punched holes are pulled with progressive deflection over at least one backing edge.
2. Apparatus for carrying out the process according to claim 1 comprising a conveyor for conveying the stacks to a position between the diecutting tools, characterized in that the conveyor comprises a truck (9) or the like, which is provided with gripping jaws (26, 27) for clamping each stack (28) which is to be punched, which truck is movable between a position for receiving the stacks (28) and a position for delivering the stacks, two rods (34, 35) are disposed behind the diecutting tool (13, 15) in the direction of conveyance of the truck (9) above the plane of conveyance of the stack and extend transversely to the direction of travel, and a rod (36), which is adapted to be lifted and lowered and extends through the plane of conveyance, is adapted to be introduced between said two rods.
EP19840109183 1983-08-29 1984-08-02 Method and device for cancelling the blocking of punched-bag stacks Expired EP0135734B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3331069 1983-08-29
DE19833331069 DE3331069A1 (en) 1983-08-29 1983-08-29 METHOD AND DEVICE FOR UNLOCKING PUNCHED PACKS OF BAGS

Publications (2)

Publication Number Publication Date
EP0135734A1 EP0135734A1 (en) 1985-04-03
EP0135734B1 true EP0135734B1 (en) 1987-07-15

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EP19840109183 Expired EP0135734B1 (en) 1983-08-29 1984-08-02 Method and device for cancelling the blocking of punched-bag stacks

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US (1) US4589183A (en)
EP (1) EP0135734B1 (en)
JP (1) JPS6072722A (en)
CA (1) CA1223900A (en)
DE (1) DE3331069A1 (en)
DK (1) DK409884A (en)
ES (1) ES535468A0 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3432385C2 (en) * 1984-09-03 1986-07-17 Windmöller & Hölscher, 4540 Lengerich Device for punching stacks from flat workpieces

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL121610C (en) * 1964-03-12 1966-12-15
US3401446A (en) * 1966-04-07 1968-09-17 Branson Instr Method for delaminating articles
US3728772A (en) * 1971-10-26 1973-04-24 R Coffman Tape breaker (case 1)
AT342630B (en) * 1975-11-03 1978-04-10 Sticht Walter DEVICE FOR RELEASING A PACK OF FOIL OR SHEETS
US4064083A (en) * 1976-06-28 1977-12-20 Precision Metalsmiths, Inc. Pattern material composition
US4195758A (en) * 1978-04-03 1980-04-01 Gte Automatic Electric Laboratories, Incorporated Apparatus for separating snapstrates into individual hybrid substrates
DE2915689C2 (en) * 1979-04-18 1985-07-25 Windmöller & Hölscher, 4540 Lengerich Device for dispensing in the correct position of sections separated from a material web
DE2902519C2 (en) * 1979-01-23 1985-10-10 Windmöller & Hölscher, 4540 Lengerich Device for depositing sections welded from a film web
DE3107287C2 (en) * 1981-02-26 1984-06-20 Windmöller & Hölscher, 4540 Lengerich Method and device for producing stacks from bottom-welded plastic sacks
US4441844A (en) * 1982-04-12 1984-04-10 Miller Curtis D Portable panel separation device

Also Published As

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DE3331069A1 (en) 1985-03-14
CA1223900A (en) 1987-07-07
US4589183A (en) 1986-05-20
ES8505289A1 (en) 1985-05-16
EP0135734A1 (en) 1985-04-03
DE3331069C2 (en) 1988-11-10
ES535468A0 (en) 1985-05-16
DK409884A (en) 1985-03-01
JPS6072722A (en) 1985-04-24
DK409884D0 (en) 1984-08-28

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