EP0059420A1 - Method and means for manufacturing stacks of bags - Google Patents

Method and means for manufacturing stacks of bags Download PDF

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Publication number
EP0059420A1
EP0059420A1 EP82101388A EP82101388A EP0059420A1 EP 0059420 A1 EP0059420 A1 EP 0059420A1 EP 82101388 A EP82101388 A EP 82101388A EP 82101388 A EP82101388 A EP 82101388A EP 0059420 A1 EP0059420 A1 EP 0059420A1
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EP
European Patent Office
Prior art keywords
sack
stack
bags
cross
tubular film
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.)
Granted
Application number
EP82101388A
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German (de)
French (fr)
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EP0059420B1 (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
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Windmoeller and Hoelscher KG
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Publication of EP0059420A1 publication Critical patent/EP0059420A1/en
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Publication of EP0059420B1 publication Critical patent/EP0059420B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/66—Advancing articles in overlapping streams
    • B65H29/6609—Advancing articles in overlapping streams forming an overlapping stream
    • B65H29/6618—Advancing articles in overlapping streams forming an overlapping stream upon transfer from a first conveyor to a second conveyor advancing at slower speed
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/28—Bands, chains, or like moving receivers
    • 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
    • B31B2155/00—Flexible containers made from 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/003—Flexible containers made from webs starting from tubular 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/191—Bags, sachets and pouches or the like

Definitions

  • the invention relates to a method for producing stacks of sacks, each with bottoms closed at one end by a cross-weld seam, in which the front end of a tubular film web made of thermoplastic plastic and provided at the end with a cross-weld seam moves over the support carrying the stack at a distance of the sack length chlauchfolienbahn separated by a transverse separating cut of the S, and the new end of the tubular film web formed by the cutting edge is closed by a transverse weld seam and in which the following, formed in the same manner by transverse welds and transverse separating cuts bags successively to desired to Stack height are stored and the stored bags are each held on their superimposed open sides, and a device for performing this method.
  • this object is achieved in that the individual sacks placed one after the other in a region lying between their ends, starting with the first sack be pulled into interlocking loops with decreasing loop depth from sack to sack.
  • stack can be produced in which the uersch spanähten with the Q provided edge portions of the sacks offset imbricated manner one above the other, so that the weld areas not touch each other and can not stick together.
  • the offset placement of the bags or sacks in the stack can be maintained if the finished stack is held and transported away in its front region behind the edge regions of the sacks which are offset in a scale-like manner and provided with transverse weld seams.
  • the area lying in loops smoothes itself during transport or can be brushed out by rolling or the like.
  • the loop formed in the uppermost sack can be pulled so deep in the finished stack that all the loops lie inside one another and also touch one another in their apex region. This deep retraction of the loop of the top sack pulls the protruding front ends of the sacks into the stack.
  • the gap is expediently formed by two rollers arranged parallel to one another.
  • the front roller in the feed direction can be formed by the rear deflection drum of a conveyor belt that conveys the stack.
  • the insertion element can consist of a rod, the ends of which are attached to the piston rods by piston-cylinder units arranged vertically to the side of the stack.
  • the lowering path of the rod is limited by cam disks which are arranged laterally next to the stack and can be rotated intermittently by angular increments about a horizontal axis with a spiral cam curve.
  • a rotation of the cam curve corresponds to a stack formation.
  • rollers 2, 3 are with. Provide circumferential grooves, the bottom of which is indicated by the dashed line 4 and which engage in the comb-like blow air pipes 5, 6 arranged in rows.
  • the tubular film web 1 is passed between the blown air tubes 5 and 6, so that the front end of the tubular web pulled forward by the preferred pair of rollers 2, 3 from the balsa air stream in an elongated form between the opened welding jaws 7 and 8 and the upper and lower knives 9, 10 of the cutting tool is carried through a bag length - after the front edge of the tubular film has been closed with a weld seam.
  • a hold-down device 11 and an abutment 12 assigned to the hold-down device are arranged downstream of the upper and lower knife 9, 10, the hold-down device 11 consisting of an angle iron which can be actuated by a piston-cylinder unit 13.
  • This angle iron is provided with recesses, not shown, so that the hold-down device passes through the rows of needles 14 of a needle bar 15 during its downward movement and thereby pushes the heavy-duty sacks with their opening edge onto the needles 14.
  • the abutment 12 limits the path of the hold-down 11, which, as already mentioned, can be moved up and down by the pneumatic piston-cylinder unit 13.
  • both the abutment 12 and the needle bar 15 are lowered via a piston-cylinder unit 16.
  • the needle bar 15 are two at a distance Assigned rollers one behind the other, of which the roller 18 simultaneously represents a roller of a conveyor belt 19.
  • a drawing rod 20 can be moved into the gap formed by the rollers 17 and 18 and is guided at both ends by a piston-cylinder unit.
  • the length of the drawing rod is dimensioned such that it exceeds the maximum bag width by so much that both the two piston-cylinder units 21 and two cam disks 22 can attack at their ends.
  • the drawing rod 20 is moved from its upper position, not shown, in which it does not hinder the discharge of individual heavy-duty bags, into the lower position shown in the figure, so that a loop is formed.
  • the cams rotate clockwise by a certain amount, so that the depth of the loops in the individual heavy-duty sacks becomes smaller as the stack grows. In this way it is achieved that the individual bags or the bottom seams of the individual bags are shingled to one another and therefore cannot stick to one another.
  • the clamping jaw 23 is then lowered onto the stack by two piston-cylinder units 24 which engage it laterally, so that the latter is pressed onto the conveyor belt 19.
  • the piston-cylinder units 24 are fastened to racks 25 which are guided in rails in a manner not shown and are displaceable via pinions 26.
  • the pinions 26 are connected to the drive of the conveyor belt 19 so that the stack can be removed by the conveyor belt 19. In this case, a stack is obtained in which the weld seams are shingled next to each other.
  • the drawing rod 20 becomes after the last one has been applied
  • the sack of a stack to be formed is moved all the way down. The prerequisite for this is that the highest point of the cam disc 22 is turned out of the area of the drawing rod 20.
  • cam disc 22 rotates through 360 ° during the formation of a sack stack.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)

Abstract

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Stapeln von durch Querschweißnähte und Quertrennschnitte aus einer Schlauchfolienbahn aus thermoplastischem Kunststoff intermittierend hergestellten Säcken. Die Säcker werden aufeinander bis zur gewünschten Stapelhöhe abgelegt und jeweils an ihren übereinanderliegenden offenen Seiten festgehalten. Um ein Verfahren dieser Art zu schaffen, nach dem sich Säcke oder Beutel unmittelbar nach ihrer Herstellung zu Stapeln aufschichten lassen, ohne daß ein gegenseitiges Verkleben der frischen Schweißnähte zu befürchten ist, werden die einzelnen abgelegten Säcke in einem zwischen ihren Enden liegenden Bereich, beginnend mit dem ersten Sack, nacheinander in ineinanderliegende Schlaufen mit von Sack zu Sack abnehmender Schlaufentiefe gezogen. Dabei ist in einen Spalt unter dem jeweils zuletzt abgelegten Sack ein Einschubelement einfahrbar, dessen Einfahrtiefe nach Ablage eines jeden Sackes um eine Strecke veringert wird, die der Länge entspricht, mit der dieser an seinem vorderen Ende den darunter liegenden Sack überragt.The invention relates to a method and a device for stacking bags produced intermittently by cross-weld seams and cross-cuts from a tubular film web made of thermoplastic material. The bags are placed on top of each other up to the desired stack height and are held on their open sides one above the other. In order to create a method of this type, according to which sacks or bags can be stacked up immediately after they have been produced without fear of the fresh weld seams sticking to one another, the individual sacks which have been placed are placed in an area lying between their ends, starting with the first sack, one after the other in interlocking loops with a decreasing loop depth from sack to sack. In this case, an insertion element can be inserted into a gap under the last sack placed down, the depth of entry of which is reduced after depositing each sack by a distance which corresponds to the length by which it projects at the front end of the sack below.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Stapeln aus Säcken mit jeweils an einem Ende durch eine Querschweißnaht geschlossenen Böden, bei dem intermittierend das vordere Ende einer endseitig mit einer Querschweißnaht versehenen Schlauchfolienbahn aus thermoplastischem Kunststoff über die den Stapel tragende Unterlage bewegt, im Abstand der Sacklänge durch einen Quertrennschnitt von der Schlauchfolienbahn getrennt und das durch die Schnittkante gebildete neue Ende der Schlauchfolienbahn durch eine Querschweißnaht geschlossen wird und bei dem die folgenden, in gleicher Weise durch Querschweißnähte und Quertrennschnitte gebildeten Säcke aufeinander bis zu der gewünschten Stapelhöhe abgelegt werden und die abgelegten Säcke jeweils an ihren übereinanderliegenden offenen Seiten festgehalten werden, sowie eine Vorrichtung zur Durchführung dieses Verfahrens.The invention relates to a method for producing stacks of sacks, each with bottoms closed at one end by a cross-weld seam, in which the front end of a tubular film web made of thermoplastic plastic and provided at the end with a cross-weld seam moves over the support carrying the stack at a distance of the sack length chlauchfolienbahn separated by a transverse separating cut of the S, and the new end of the tubular film web formed by the cutting edge is closed by a transverse weld seam and in which the following, formed in the same manner by transverse welds and transverse separating cuts bags successively to desired to Stack height are stored and the stored bags are each held on their superimposed open sides, and a device for performing this method.

Bei bekannten Verfahren dieser Art besteht die Gefahr, daß die in dem Stapel übereinander liegenden Bodenschweißnähte miteinander verkleben oder verblocken, so daß die spätere Vereinzelung der Beutel oder Säcke mit Schwierigkeiten verbunden ist. Um zu vermeiden, daß die frisch gebildeten Schweißnähte von Beuteln oder Säcken bei der aufeinander erfolgenden Ablage zum Zwecke des Stapelns miteinander verkleben, ist es bekannt, die einzelnen geschweißten Beutel oder Säcke durch ein Förderband abzuführen, dessen Geschwindigkeit so bemessen ist, daß die einzelnen Beutel mit Abstand zueinander auf dem Förderband liegen. Von diesem ersten Förderband werden die Beutel sodann einem zweiten Förderband übergeben, das mit geringerer Geschwindigkeit umläuft, so daß sich auf diesem eine Werkstückschuppe bildet, aus der nach dem Abkühlen der Schweißnähte Stapel gebildet werden. Diese Art der Stapelbildung ist einmal nur möglich, wenn die Beutel oder Säcke aus einem relativ steifen Material bestehen, und andererseits muß genügend Hallenraum für die Förderbänder zur Verfügung stehen.In known methods of this type there is a risk that the bottom weld seams lying one above the other in the stack will stick or block, so that the later separation of the bags or sacks is difficult. In order to prevent the freshly formed weld seams of bags or sacks from sticking to one another when they are placed one behind the other for the purpose of stacking, it is known to remove the individual welded bags or sacks by means of a conveyor belt, the speed of which is such that the individual bags lie at a distance from each other on the conveyor belt. From this first conveyor belt, the bags are then transferred to a second conveyor belt, which rotates at a lower speed, so that a workpiece scale is formed thereon, from which stacks are formed after the weld seams have cooled. This rt A stack formation is again possible only when the bags or sacks are made of a relatively rigid material, and on the other hand hall space must be sufficient for the conveyor belts are available.

Aufgabe der Erfindung ist es daher, ein Verfahren der eingangs angegebenen Art zu schaffen, nach dem sich Säcke oder Beutel unmittelbar nach ihrer Herstellung zu Stapeln aufschichten lassen, ohne daß ein gegenseitiges Verkleben der frischen Schweißnähte zu befürchten ist.It is therefore an object of the invention to provide a method of the type mentioned at the outset, according to which sacks or bags can be stacked up immediately after they have been produced without fear of the fresh weld seams sticking to one another.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die einzelnen abgelegten Säcke in einem zwischen ihren Enden liegenden Bereich beginnend mit dem ersten Sack nacheinander in ineinanderliegende Schlaufen mit von Sack zu Sack abnehmender Schlaufentiefe gezogen werden. Nach dem erfindungsgemäßen Verfahren lassen sich Stapel herstellen, bei denen die mit den Querschweißnähten versehenen Randbereiche der Säcke schuppenartig versetzt übereinander liegen, so daß die Schweißnaht-bereiche einander nicht berühren und nicht miteinander verkleben können.According to the invention, this object is achieved in that the individual sacks placed one after the other in a region lying between their ends, starting with the first sack be pulled into interlocking loops with decreasing loop depth from sack to sack. According to the inventive method, stack can be produced in which the uerschweißnähten with the Q provided edge portions of the sacks offset imbricated manner one above the other, so that the weld areas not touch each other and can not stick together.

Die versetzte Ablage der Beutel oder Säcke in dem Stapel läßt sich aufrechterhalten, wenn der fertige Stapel in seinem vorderen Bereich hinter den schuppenartig versetzt übereinander liegenden und mit Querschweißnähten versehenen Randbereichen der Säcke festgehalten und abtransportiert wird. Der in Schlaufen liegende Bereich glättet sich beim Transport von selbst oder kann durch Walzen oder dergleichen herausgestrichen werden.The offset placement of the bags or sacks in the stack can be maintained if the finished stack is held and transported away in its front region behind the edge regions of the sacks which are offset in a scale-like manner and provided with transverse weld seams. The area lying in loops smoothes itself during transport or can be brushed out by rolling or the like.

Sollen nach dem erfindungsgemäßen Verfahren kantengerade Stapel gebildet werden, kann in dem fertigen Stapel die in dem obersten Sack gebildete Schlaufe so tief gezogen werden, daß alle Schlaufen ineinander und einander auch in ihrem Scheitelbereich berührend ineinander liegen. Durch dieses tiefe Einziehen der Schlaufe des obersten Sackes werden die einander überragenden vorderen Enden der Säcke in den Stapel eingezogen.If, according to the method according to the invention, straight-edged stacks are to be formed, the loop formed in the uppermost sack can be pulled so deep in the finished stack that all the loops lie inside one another and also touch one another in their apex region. This deep retraction of the loop of the top sack pulls the protruding front ends of the sacks into the stack.

Eine Vorrichtung zur Durchführung des erfindungsgemäßen Ver- fahrens mit einem Vorzugswalzenpaar für die Schlauchfolienbahn, Einrichtungen zum Vortragen des Schlauchbahnendes über die die Stapelstation bildende Unterlage oder Fördereinrichtung, .mit parallel zueinander angeordneten Einrichtungen zum Querschweißen und Querschneiden der Schlauchfolienbahn, von denen die Querschweißeinrichtung in Bewegungsrichtung der Schlauchfolienbahn hinter der Querschneideinrichtung angeordnet ist, und mit einer Einrichtung zum Festhalten der auf dem sich bildenden Stapel übereinander liegenden Säcke im Bereich iher offenen Ränder zeichnet sich erfindungsgemäß dadurch aus, daß die Stapelstation einen querverlaufenden Spalt aufweist, in den nach Ablage eines jeden Sackes ein sich über diesen erstreckendes Einschubelement einfahrbar ist, das mit einer Steuereinrichtung versehen ist, die dessen Einfahrtiefe nach Ablage eines jeden Sackes oder Beutels um eine Strecke verringert, die der Länge entspricht, mit der dieser an seinem vorderen Ende den darunterliegenden Sack überragt.An apparatus for carrying out the V invention ER- driving with a preferential pair of rollers for the tubular film web, means for carrying forward of the tubular web end through which the stacking station forming surface or conveyor, .with mutually parallel devices of the tubular film web to the transverse welding and transverse cutting, of which the cross-sealing device is arranged behind the cross-cutting device in the direction of movement of the tubular film web, and with a device for holding the sacks lying on top of one another on the stack being formed in the area of their open edges, it is distinguished according to the invention in that the stacking station has a transverse gap, in the after storage of each sack, an insertion element extending over the sack is retractable, which is provided with a control device which, after the storage of each sack or sack, reduces its entry depth by a distance which corresponds to the length by which it projects at the front end of the sack below it .

Zweckmäßigerweise ist der Spalt durch zwei zueinander parallel angeordnete Walzen gebildet.Die in.Vorschubrichtung vordere Walze kann durch die hintere Umlenktrommel eines die Stapel abfördernden Förderbandes gebildet sein. Das Einschubelement kann aus einer Stange bestehen, deren Enden an den Kolbenstangen von seitlich neben dem Stapel senkrecht angeordneten Kolben-Zylinder-Einheiten befestigt sind.The gap is expediently formed by two rollers arranged parallel to one another. The front roller in the feed direction can be formed by the rear deflection drum of a conveyor belt that conveys the stack. The insertion element can consist of a rod, the ends of which are attached to the piston rods by piston-cylinder units arranged vertically to the side of the stack.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß der Absenkweg der Stange von seitlich neben dem Stapel angeordneten, intermittierend um Winkelschritte um eine horizontale Achse drehbare Nockenscheiben mit spiraliger Nockenkurve begrenzt ist. Eine Drehung der Nockenkurve entspricht einer Stapelbildung.In a further embodiment of the invention it is provided that the lowering path of the rod is limited by cam disks which are arranged laterally next to the stack and can be rotated intermittently by angular increments about a horizontal axis with a spiral cam curve. A rotation of the cam curve corresponds to a stack formation.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung, in deren.einziger Figur eine Seitenansicht der Vorrichtung zum Herstellen gestapelter Säcke dargestellt ist, näher erläutert.An exemplary embodiment of the invention is explained in more detail below with reference to the drawing, in the single figure of which a side view of the device for producing stacked sacks is shown.

zum intermittierenden Vorzug der Kuhststoffschlauchfolienbahn 1, die im Falle der Herstellung von Seitenfaltensäcken oder -beuteln auch mit Seitenfalten versehen sein kann, ist ein Vorzugswalzenpaar 2, 3 vorgesehen. Die Walzen 2, 3 sind mit . Umfangsnuten versehen, deren Grund durch die gestrichelte Linie 4 angedeutet ist und in die kammartig in Reihen angeordnete Blasluftrohre 5, 6 greifen.For the intermittent preference of the tubular plastic film web 1, which can also be provided with side gussets in the case of the production of gusseted bags or bags, a pair of preferred rollers 2, 3 is provided. The rollers 2, 3 are with. Provide circumferential grooves, the bottom of which is indicated by the dashed line 4 and which engage in the comb-like blow air pipes 5, 6 arranged in rows.

Die Schlauchfolienbahn 1 ist zwischen den Blasluftrohren 5 und 6 hindurchgeführt, so daß das vordere Ende der von dem Vorzugswalzenpaar 2, 3 vorgezogenen Schlauchbahn von dem Balsluftstrom in gestreckter Form zwischen die geöffneten Schweißbacken 7 und 8 und dem Ober- und Untermesser 9, 10 des Schneidwerkzeugs um eine Sacklänge hindurchgetragen wird, - nachdem der vordere Rand der Schlauchfolie mit einer Schweißnaht geschlossen worden ist. Dem Ober- und Untermesser 9, 10 sind ein Niederhalter 11 und ein dem Niederhalter zugeordnetes Widerlager 12 nachgeordnet, wobei der Niederhalter 11 aus einem Winkeleisen besteht, das von einer Kolben-Zylinder-Einheit 13 betätigt werden kann. Dieses Winkeleisen ist mit nicht dargestellten Ausnehmungen versehen, so daß der Niederhalter bei seiner Abwärtsbewegung die Reihen der Nadeln 14 einer Nadelleiste 15 durchsetzt und dadurch die Schwergutsäcke mit ihrer öffnungskante auf die Nadeln 14 aufschiebt. Das Widerlager 12 begrenzt dabei den Weg des Niederhalters 11, der,wie schon erwähnt, durch die pneumatische Kolben-Zylinder-Einheit 13 herauf- und herunterbewegbar ist.The tubular film web 1 is passed between the blown air tubes 5 and 6, so that the front end of the tubular web pulled forward by the preferred pair of rollers 2, 3 from the balsa air stream in an elongated form between the opened welding jaws 7 and 8 and the upper and lower knives 9, 10 of the cutting tool is carried through a bag length - after the front edge of the tubular film has been closed with a weld seam. A hold-down device 11 and an abutment 12 assigned to the hold-down device are arranged downstream of the upper and lower knife 9, 10, the hold-down device 11 consisting of an angle iron which can be actuated by a piston-cylinder unit 13. This angle iron is provided with recesses, not shown, so that the hold-down device passes through the rows of needles 14 of a needle bar 15 during its downward movement and thereby pushes the heavy-duty sacks with their opening edge onto the needles 14. The abutment 12 limits the path of the hold-down 11, which, as already mentioned, can be moved up and down by the pneumatic piston-cylinder unit 13.

Mit anwachsendem Schwergutsackstapel werden sowohl das Widerlager 12 auf nicht dargestellte Weise und die Nadelleiste 15 über eine Kolben-Zylinder-Einheit 16 abgesenkt. Wie die Figur erkennen läßt, sind der Nadelleiste 15 zwei mit Abstand hintereinander vorgesehene Rollen zugeordnet, von denen die Rolle 18 gleichzeitig eine Rolle eines Förderbandes 19 darstellt. In den durch die Rollen 17. und 18 gebildeten Spalt ist ein Ziehstab 20 einfahrbar, der beidendig von je einer Kolben-Zylinder-Einheit geführt wird. Die Länge des Ziehstabes ist dabei so bemessen, daß sie die maximale Säckbreite um so viel übersteigt, daß sowohl die beiden Kolben-Zylinder-Einheiten 21 wie auch zwei Kurvenscheiben 22 an ihren Enden angreifen können. Jeweils nach dem Austragen eines Schwergutsackes wird der Ziehstab 20 von seiner oberen, nicht dargestellten Lage, in der er den Austrag einzelner Schwergutsäcke nicht behindert, in die in der Figur dargestellte untere Lage gefahren, so daß eine Schlaufe gebildet-wird. Nach jedem Hub verdrehen sich dabei die Kurvenscheiben im Uhrzeigersinn um ein bestimmtes Maß, so daß die Tiefe der Schlaufen in den einzelnen Schwergutsäcken mit anwachsendem Stapel kleiner wird. Auf diese Weise wird erreicht, daß die einzelnen Säcke bzw. die Bodennähte der einzelnen Säcke geschuppt zueinander liegen und somit nicht miteinander verkleben können.With an increasing stack of heavy goods bags, both the abutment 12 and the needle bar 15 are lowered via a piston-cylinder unit 16. As the figure shows, the needle bar 15 are two at a distance Assigned rollers one behind the other, of which the roller 18 simultaneously represents a roller of a conveyor belt 19. A drawing rod 20 can be moved into the gap formed by the rollers 17 and 18 and is guided at both ends by a piston-cylinder unit. The length of the drawing rod is dimensioned such that it exceeds the maximum bag width by so much that both the two piston-cylinder units 21 and two cam disks 22 can attack at their ends. Each time a heavy-duty bag is discharged, the drawing rod 20 is moved from its upper position, not shown, in which it does not hinder the discharge of individual heavy-duty bags, into the lower position shown in the figure, so that a loop is formed. After each stroke, the cams rotate clockwise by a certain amount, so that the depth of the loops in the individual heavy-duty sacks becomes smaller as the stack grows. In this way it is achieved that the individual bags or the bottom seams of the individual bags are shingled to one another and therefore cannot stick to one another.

Nach dem Bilden eines Stapels wird dann die Klemmbacke 23 durch zwei seitlich an ihr angreifende Kolben-Zylinder-Ein- heiten 24 auf den Stapel abgesenkt, so daß dieser auf das Förderband 19 gepreßt wird. Die Kolben-Zylinder-Einheiten 24 sind an Zahnstangen 25 befestigt, die auf nicht dargestellte Weise in Schienen geführt und über Ritzel 26 verschiebbar sind. Die Ritzel 26 sind mit dem Antrieb des Förderbandes 19 verbunden, so daß der Stapel durch das Förderband 19 abgeführt werden kann. In diesem Fall erhält man einen Stapel, bei dem die Schweißnähte geschuppt nebeneinander liegen.After forming a stack, the clamping jaw 23 is then lowered onto the stack by two piston-cylinder units 24 which engage it laterally, so that the latter is pressed onto the conveyor belt 19. The piston-cylinder units 24 are fastened to racks 25 which are guided in rails in a manner not shown and are displaceable via pinions 26. The pinions 26 are connected to the drive of the conveyor belt 19 so that the stack can be removed by the conveyor belt 19. In this case, a stack is obtained in which the weld seams are shingled next to each other.

Will man statt dessen jedoch einen kantengeraden Stapel erreichen, wird der Ziehstab 20 nach dem Auftragen des letzten Sackes eines zu bildenden Stapels ganz nach unten gefahren. Voraussetzung dazu ist, daß der höchste Punkt der Kurvenscheibe 22 aus dem Bereich des Ziehstabes 20 herausgedreht ist.If, however, you want to reach a straight stack instead, the drawing rod 20 becomes after the last one has been applied The sack of a stack to be formed is moved all the way down. The prerequisite for this is that the highest point of the cam disc 22 is turned out of the area of the drawing rod 20.

Zu erwähnen wäre noch, daß sich die Kurvenscheibe 22 während der Bildung eines Sackstapels um 360° dreht.It should also be mentioned that the cam disc 22 rotates through 360 ° during the formation of a sack stack.

Claims (9)

1. Verfahren zum Herstellen von Stapeln aus Säcken mit jeweils an einem Ende durch eine Querschweißnaht geschlossenen Böden, bei dem intermittierend das vordere Ende einer endseitig mit einer Querschweißnaht versehenen Schlauchfolienbahn aus thermoplastischem Kunststoff über die den Stapel tragende Unterlage bewegt, im Abstand der Sacklänge durch einen Quertrennschnitt von der Schlauchfolienbahn getrennt und das durch die Schnittkante gebildete neue Ende der Schlauchfolienbahn durch eine Querschweißnaht geschlossen wird und bei dem die folgenden, in gleicher Weise durch Querschweißnähte und Quertrennschnitte gebildeten Säcke aufeinander bis zu der gewünschten Stapelhöhe abgelegt werden und die abgelegten Säcke jeweils an ihren übereinanderliegenden offenen Seiten festgehalten werden, dadurch gekennzeichnet, daß die einzelnen abgelegten Säcke in einem zwischen ihren Enden liegenden Bereich, beginnend mit dem ersten Sack nacheinander in ineinander liegende Schlaufen mit von Sack zu Sack abnehmender Schlaufentiefe gezogen werden.1. A method for producing stacks of sacks with bottoms closed at one end by a transverse weld seam, in which the front end of a tubular film web made of thermoplastic synthetic material provided with a transverse weld seam intermittently moves over the support carrying the stack at a distance of the sack length by one Cross-cut cut separated from the tubular film web and the new end of the tubular film web formed by the cut edge is closed by a cross-weld seam and in which the following bags, formed in the same way by cross-weld seams and cross-cut cuts, are placed on top of one another up to the desired stacking height and the stored bags are each on theirs overlapping open pages are held, characterized in that the individual sacks placed in a region lying between their ends, starting with the first sack, are successively drawn into loops lying one inside the other with a loop depth decreasing from sack to sack. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der fertige Stapel in seinem vorderen Bereich hinter den schuppenartig versetzt übereinanderliegenden und mit Querschweißnähten versehenen Randbereichen der Säcke festgehalten und abtransportiert wird.2. The method according to claim 1, characterized in that the finished stack is held in its front area behind the scale-like staggered superimposed and provided with transverse weld seams edge areas of the bags and transported away. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in dem fertigen Stapel die in dem obersten Sack gebildete Schlaufe so tief gezogen wird, daß alle Schlaufen einander auch in ihrem Scheitelbereich berührend ineinander liegen.3. The method according to claim 1, characterized in that in the finished stack, the loop formed in the top sack is pulled so deep that all the loops are touching each other in their apex area. 4. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 mit einem Vorzugswalzenpaar für die Schlauchfolienbahn, Einrichtungen zum Vortragen des Schlauchbahnendes über die die Stapelstation bildende Unterlage oder Fördereinrichtung, mit parallel zueinander angeordneten Einrichtungen zum Querschweißen und Querschneiden der Schlauchfolienbahn, von denen die Querschweißeinrichtung in Bewe- gungsrichtung der Schlauchfolienbahn hinter der Querschneideinrichtung angeordnet ist, und mit einer Einrichtung zum Festhalten der auf dem sich bildenden Stapel übereinander liegenden Säcke im Bereich ihrer offenen'Ränder, dadurch gekennzeichnet, daß die Stapelstation einen querverlaufenden Spalt aufweist, in den nach Ablage eines jeden Sackes ein sich über diesen erstreckendes Einschubelement (20) einfahrbar ist, das mit einer Steuereinrichtung versehen ist, die dessen Einfahrtiefe nach Ablage eines jeden. Beutels oder Sackes um eine Strecke verringert, die der Länge entspricht, mit der dieser an seinem vorderen Ende den darunter liegenden Sack überragt.4. Apparatus for carrying out the method according to claim 1 with a pair of preferred rollers for the tubular film web, devices for carrying the end of the tubular film over the base or the conveying device forming the stacking station, with mutually parallel devices for cross-welding and cross-cutting the tubular film web, of which the cross-welding device in B ewe - Direction of delivery of the tubular film web is arranged behind the cross-cutting device, and with a device for holding the sacks lying on top of one another on the forming stack in the region of their open edges, characterized in that the stacking station has a transverse gap into which after each sack has been deposited an insertion element (20) extending over the latter can be retracted, which is provided with a control device which determines the depth of entry of each after being deposited. Bags or sacks reduced by a distance that corresponds to the length by which this protrudes at the front end of the sack below. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Spalt durch zwei zueinander parallel angeordnete Walzen (17, 18) gebildet ist.5. The device according to claim 4, characterized in that the gap is formed by two mutually parallel rollers (17, 18). 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die in Vorschubrichtung vordere Walze durch die hintere Umlenktrommel (18) eines die Stapel abfördernden Förderbandes (19) gebildet ist.6. The device according to claim 5, characterized in that the front roller in the feed direction is formed by the rear deflection drum (18) of a conveyor belt conveying the stack (19). 7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß das Einschubelement (20) aus einer Stange besteht, deren Enden an den Kolbenstangen von seitlich neben dem Stapel senkrecht angeordneten Kolben-Zylinder-Einheiten (21) befestigt sind.7. Device according to one of claims 4 to 6, characterized in that the insert element (20) consists of a rod, the ends of which are fastened to the piston rods of piston-cylinder units (21) arranged vertically laterally next to the stack. 8. Vorrichtung nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß der Absenkweg der Stange (20) von seitlich neben dem Stapel angeordneten, intermittierend um Winkelschritte um eine horizontale Achse drehbare Nockenecheiben (22) mit spiraliger Nockenkurve begrenzt ist.8. Device according to one of claims 4 to 7, characterized in that the lowering path of the rod (20) from side to side of the stack, intermittently by angular increments about a horizontal axis rotatable cam discs (22) is limited with a spiral cam curve. 9. Vorrichtung nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, daß im Bereich des vorderen Endes des Stapels ein absenkbarer und mit der die Stapel abtransportierenden Fördereinrichtung (19) verfahrbarer Andruck- stempel (23) vorgesehen ist.9. Device according to one of claims 4 to 8, characterized in that in the region of the front end of the stack a lowerable and with which the stack transporting conveyor (19) movable pressure stamp (23) is provided.
EP82101388A 1981-02-26 1982-02-24 Method and means for manufacturing stacks of bags Expired EP0059420B1 (en)

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DE3107287A DE3107287C2 (en) 1981-02-26 1981-02-26 Method and device for producing stacks from bottom-welded plastic sacks
DE3107287 1981-02-26

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EP0059420A1 true EP0059420A1 (en) 1982-09-08
EP0059420B1 EP0059420B1 (en) 1985-05-22

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JPH0464852B2 (en) 1992-10-16
US4452597A (en) 1984-06-05
JPS57157740A (en) 1982-09-29
DE3107287A1 (en) 1982-09-09
EP0059420B1 (en) 1985-05-22
DE3107287C2 (en) 1984-06-20

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