EP0111739B1 - Method and apparatus for repeatedly removing and turning the top layer of a stack of rectangular plastic foil pieces - Google Patents

Method and apparatus for repeatedly removing and turning the top layer of a stack of rectangular plastic foil pieces Download PDF

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Publication number
EP0111739B1
EP0111739B1 EP19830111270 EP83111270A EP0111739B1 EP 0111739 B1 EP0111739 B1 EP 0111739B1 EP 19830111270 EP19830111270 EP 19830111270 EP 83111270 A EP83111270 A EP 83111270A EP 0111739 B1 EP0111739 B1 EP 0111739B1
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EP
European Patent Office
Prior art keywords
pile
stack
longitudinal edge
suction
sack
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
EP19830111270
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German (de)
French (fr)
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EP0111739A1 (en
Inventor
Friedrich Hauptstein
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Librawerk Pelz & Nagel & Co Kg ik GmbH
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Librawerk Pelz & Nagel & Co Kg ik GmbH
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Publication of EP0111739A1 publication Critical patent/EP0111739A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0816—Suction grippers separating from the top of pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers

Definitions

  • the invention relates to a method for removing and turning the topmost layer of a stack of rectangular plastic film pieces, in which the topmost layer is raised in the area of one longitudinal edge by suction and pivoted by an angular range, and in which the pivoted longitudinal edge portion is gripped by a gripper device, in parallel subtracted to the stacking level in the direction of the opposite longitudinal edge and beyond and placed next to the stack with its top side down, the vertical distance between the gripper device and the stack being less than the width of the plastic film piece.
  • the uppermost sack of a stack is detected by a lifting and lowering suction device on one longitudinal edge and raised in the direction perpendicular to the stack, the part of the sack remaining on the stack being considerably more Frictional effect is shifted on the stack.
  • Rotating roller conveyors reach under the raised end of the sack and convey the sack that has been removed to a further conveyor.
  • a solution for feeding sheets on a stack to a deposit table (DE-PS 251 342), a solution is provided in which a suction tube is swingingly held on a crank arm and in its lowest position detects the top sheet of the stack on one of its longitudinal edges and in In the course of a pivoting movement directed upwards on a circular arc, the detected longitudinal edge lifts and first moves in the direction of the opposite longitudinal edge, so that the detected arc is removed from the stack in the manner of a peeling movement at least over a considerable part of its length.
  • the gripper passes the sheet in its uppermost position to cooperating feed rollers which convey the sheet on to the depositing table.
  • the sheet is not turned over, but is transferred to the lay-up table in such a way that its top, which is on the stack, also goes up on the lay-up table points.
  • electrostatic charging can be avoided, but even with this known solution there is a risk that at least towards the end of the top sheet removal on the Stack slides along and causes electrostatic charges.
  • the invention has for its object to provide a method of the type described in such a way that not only an electrostatic charging of the plastic film pieces is avoided by their removal, but also a safe separation of the edges of the superimposed film pieces is achieved when the edges of the film pieces adhesive forces caused by mechanical connections or by sticking to one another or by the previous welding or cutting process are connected to one another.
  • the method mentioned in the introduction is characterized according to the invention in that the longitudinal edge of the plastic film pieces designed as sacks or tube sections is raised by suction only in one corner region and pivoted by an angular range of approximately 90 ° and the subsequent removal of the top layer parallel to the stacking plane is carried out in such a way that a horizontal displacement of the portion of the gripped sack or tube portion remaining on the stack is avoided.
  • Raising the uppermost sack or hose section in the corner region of the stack is advantageous because the adhesive forces between the sacks or hose sections lying on top of each other are lowest here.
  • the respective corner section can be gripped by about 90 ° and moved parallel to the stack surface, so that a peeling movement takes place along parallel lines parallel to the diagonal of the sack or piece of film and thereby a safe separation of the edge areas of the raised corner adjoining singular sack or hose section is favored. If necessary. Existing edge connections between the uppermost and the underlying sack or hose section are separated with this type of pulling off and thus a reliable separation of the sacks or hose sections is achieved.
  • the stacked sacks are at a greater distance from one another in the area of the bottom longitudinal edge, so that the corners formed by the bottom edge and the longitudinal edge can be more easily grasped by the suction device than the corners in the area of the sack opening. Since the sacks are stacked on top of each other after the bottom seam has been produced, it cannot be ruled out that the still warm weld seams, particularly in the bottom area, lead to a mechanical connection between adjacent sacks.
  • the described lifting in the corner region of the bottom of the sack and the subsequent pull-off movement result in a particularly favorable tear-off angle between the sacks which may stick together in the region of the bottom edge.
  • the invention is based on a device which has a lifting and lowering suction device with at least one suction head and a gripper device which interacts with this suction head.
  • This device is characterized according to the invention in that the suction head is connected via a swivel arm to an axis running approximately horizontally and inclined to the edges of the stack and is held pivotably about a further axis extending transversely thereto in the plane of the bearing surface of the suction head in such a way that for detecting the a longitudinally movable gripper device is provided for depositing the sack or tubular film section, the vertical distance from the stack being less than the length of the sack or tubular film section in the direction of movement of the gripper device, and that the stack on its end facing the deposited sack or tubular film section abuts a stop.
  • the dividing line runs parallel to the pivot axis over a corner of the stack when the sack is lifted off, at least until the longitudinal edge section is taken over by the gripper device.
  • the gripper device can grip a longitudinal section adjacent to the corner in order to subsequently pull the sack or tubular film section from the stack.
  • the stop arranged at the edge of the stack ensures that during the movement of the gripper device when the sack or tubular film section is removed it is not displaced relative to the stack, so that electrostatic charging phenomena are avoided. Since the vertical distance between the gripper device and the stack is less than the length of the sack or tubular film section in the pulling direction, the top of the sack is turned downwards when the sack is pulled off, which results in the sack being reversed.
  • the device is expediently provided with equipped with a pivotable hold-down device which can be pressed onto the stack in the region of the raised corner section after the corner section of the sack or tubular film section has been raised.
  • the hold-down device can thus press the stack after lifting the first corner area of the uppermost sack or tubular film section, i.e. already after separation of very short longitudinal edge sections, and thus favors the removal of the sack or tubular film section even when the edges of the sacks lying one above the other are mechanically connected or outside the corner section Tubular film sections.
  • the suction head so as to be pivotable about the approximately horizontal axis along a circular arc section over an angular range of approximately 90 °.
  • the pivoting angle of approximately 90 ° leads to the vertical erection of the corner section, so that the gripper device can grasp this corner section in a simple manner.
  • the gripper device is arranged laterally next to the stack and is pivotably held with a gripper head above the stack in an approximately horizontal plane along a circular arc section. It is advantageous if the pivoting device consists essentially of a linkage which can be pivoted about a vertical axis and is connected to the gripper head, the drive being possible, for example, via a piston-cylinder arrangement.
  • the gripper device is equipped with clamping jaws which can be pivoted relative to one another.
  • the corner section raised by the suction device is held in a clamping position between the jaws until the sack is put down.
  • the jaws have to open, the time of opening essentially depends on the vertical distance between the jaws and the horizontal plane of the stack.
  • the device shown in FIG. 1 is used to remove a sack i which is open on one side from a stack of sacks of this type, designated overall by 2.
  • a suction device 3 with a suction head 4, which is connected to a swivel axis 8 via a linkage 5, serves to remove the uppermost sack of the stack 2.
  • the suction head 4 can be pivoted through an angular range of approximately 90 ° into a vertical plane inclined with respect to the side edges of the stack. In the position pivoted through 90 °, the suction head and the linkage are shown in dashed lines and identified by 4a and 5a.
  • the suction head 4 with its linkage 5 can be pivoted about an axis 8a by means of a further piston-cylinder arrangement 8, as can be seen in particular from FIG. 2.
  • the suction head 4 can be pivoted to the side after lifting the corner portion of the bag i and suck the corner portion of the next bag after moving back again.
  • FIG. 1 also shows a gripper device 9, the gripper head 10 of which is equipped with clamping jaws 11 and 12 which can be pivoted relative to one another.
  • the gripper head 10 is connected via rods 13 and 14 to a stationary frame 15.
  • the gripper head 10 with its jaws 11 and 12 can be pivoted about a vertical axis 16 fixed to the frame along an arc section in the direction of the double arrows 17 and 18.
  • a piston-cylinder arrangement 19 serves as the swivel drive, which is connected on the one hand to the frame 15 and on the other hand to the rod 13.
  • FIG. 3 also shows the swivel head 10 in its two working positions, the clamping position of the clamping jaws 11, 12 being shown with solid lines and the open position with dashed lines and being designated by 11 a and 12 a.
  • the clamping jaws 11 and 12 are expediently actuated via a piston-cylinder arrangement with the interposition of a pivoting lever.
  • a pivotable hold-down device 20 is provided for holding the stack 2 after the corner section of the bag 1 has been lifted off and raised, which can be actuated via a piston-cylinder arrangement 21.
  • the sack 1 is gripped at its corner section 1 by the suction head 4.
  • the suction head 4 is shown in dashed lines.
  • the suction head arrives in the position denoted by 4a.
  • the corner section 1a and the subsequent longitudinal edge section approximately perpendicular to the stack 2, so that the sack 1 can be gripped by the gripper head 10 at a longitudinal edge section adjacent to the corner section 1a.
  • the clamping jaws of the gripper head 10 fold out of their opening position designated 11a and 12a into their clamping position designated 11 and 12, as can be seen from FIG. 5.
  • the suction head 4 which can be pivoted in two planes, is moved back to its starting position laterally next to the stack, as shown in broken lines in FIG. 2.
  • the suction head 4 is pulled off the stack 2 by the gripper head 10 in the manner of a peeling movement in the direction of the arrows 23 and 24.
  • a stop 26 is provided at the edge of the stack 2, so that the portion of the bag 1 still resting on the stack 2 during the pulling-off is not displaced horizontally.
  • the distance between the gripper head 10 and the stack 2 is chosen to be less than the length of the sack 1, the sack 1 is folded over when it is removed from the stack 2, so that it comes to lie with its original top down. After the sack 1 has been completely removed from the stack 2, the sack 1 is deposited next to the stack 2 by the further movement of the gripper head 10 in the direction of the arrow 25. In this stage of the method, the clamping jaws 11 and 12 open, so that the clamped section of the bag 1 also falls onto a storage surface 27.
  • the storage surface 27 can be a conveyor device that transports the bag 1 to a filling device for filling the bag.
  • the position of the gripper head 10 in the discharge position 10a is also shown in FIG. 1. After the sack 1 has been ejected, that is to say after the clamping jaws 11 and 12 have been opened, the gripper head 10 is pivoted back to the left into its starting position in the illustration according to FIG. 6. This pivoting range is also shown in FIG. 1 by the lines marked with the double arrows 17 and 18.
  • Edge areas of adjacent stacked sacks of the stack 2 are easily torn open during the pulling-off process, so that this also enables reliable separation of the sacks.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Abnehmen und Wenden der jeweils obersten Lage eines Stapels rechteckiger Kunststoffolienstücke, bei dem die jeweils oberste Lage im Bereich einer Längskante durch Ansaugen angehoben und um einen Winkelbereich verschwenkt wird, und bei dem der verschwenkte Längskantenabschnitt durch eine Greifereinrichtung ergriffen, parallel zur Stapelebene in Richtung der gegenüberliegenden Längskante und darüber hinaus abgezogen und neben dem Stapel mit seiner Oberseite nach unten abgelegt wird, wobei der vertikale Abstand der Greifereinrichtung zum Stapel geringer ist als die Breite des Kunststoffolienstückes.The invention relates to a method for removing and turning the topmost layer of a stack of rectangular plastic film pieces, in which the topmost layer is raised in the area of one longitudinal edge by suction and pivoted by an angular range, and in which the pivoted longitudinal edge portion is gripped by a gripper device, in parallel subtracted to the stacking level in the direction of the opposite longitudinal edge and beyond and placed next to the stack with its top side down, the vertical distance between the gripper device and the stack being less than the width of the plastic film piece.

Bei einem bekannten Verfahren vorgenannter Art (DE-AS 23 28 007) wird das jeweils oberste Folienstück eines Stapels im Bereich einer Längskante durch einen Sauggreifer erfaßt, angehoben und in Richtung quer zu der erfaßten Längskante von dem Stapel so weit abgezogen, bis er mit seinem Randbereich auf einen als Saugelement ausgebildeten Greifer zu liegen kommt, welcher dem Bogen mit den erfaßten Rand um etwa 180° verschwenkt und dabei um einen etwa mittig oberhalb des Stapels vorgesehenen Stützkörper herumlegt. Der Greifer legt den erfaßten Randbereich des Bogens an der gegenüberliegenden Längskante des Stapels ab, von wo der Bogen mittels eines weiteren Sauggreifers ergriffen und vollständig von dem Stapel in der nunnehr gewendeten Stellung abgezogen und neben dem Stapel abgelegt wird.In a known method of the aforementioned type (DE-AS 23 28 007) the uppermost piece of film of a stack is grasped in the region of a longitudinal edge by a suction gripper, raised and pulled off in the direction transverse to the detected longitudinal edge of the stack until it is with its The edge area comes to rest on a gripper designed as a suction element, which pivots the sheet with the detected edge by approximately 180 ° and thereby places it around a support body provided approximately centrally above the stack. The gripper places the gripped edge area of the sheet on the opposite longitudinal edge of the stack, from where the sheet is gripped by means of a further suction pad and completely pulled off the stack in the now turned position and placed next to the stack.

Bei diesem bekannten Verfahren ist es unvermeidbar, daß die auf dem Stapel befindlichen Folienstücke sowie auch das jeweils abgezogene Folienstück elektrostatisch aufgeladen werden. Das Vereinzeln des jeweils obersten Folienstückes und dessen Entnahne vom Stapel wird hierdurch außerordentlich erschwert. Beim Ablegen der elektrostatisch aufgeladenen Folienstücke ergeben sich weitere Schwierigkeiten, weil durch die elektrostatische Aufladung Haftkräfte erzeugt werden, welche die abzulegende Folie fest auf die jeweilige Unterlage pressen.In this known method, it is inevitable that the pieces of film located on the stack and also the piece of film removed in each case are charged electrostatically. The separation of the top piece of film and its removal from the stack is extremely difficult. When placing the electrostatically charged pieces of film there are further difficulties because the electrostatic charge creates adhesive forces which firmly press the sheet to be placed onto the respective base.

Bei einem anderen bekannten Verfahren (DE-AS 24 52 049) wird der jeweils oberste Sack eines Stapels von einer heb- und senkbaren Ansaugeinrichtung an einer Längskante erfaßt und in Richtung senkrecht zum Stapel angehoben, wobei der auf dem Stapel verbleibende Teil des Sackes unter erheblicher Reibungswirkung auf dem Stapel verschoben wird. Unter das angehobene Ende des Sackes greifen umlaufende Rollenförderer, die den jeweils entnommenen Sack einem Weiterförderer zuleiten.In another known method (DE-AS 24 52 049), the uppermost sack of a stack is detected by a lifting and lowering suction device on one longitudinal edge and raised in the direction perpendicular to the stack, the part of the sack remaining on the stack being considerably more Frictional effect is shifted on the stack. Rotating roller conveyors reach under the raised end of the sack and convey the sack that has been removed to a further conveyor.

Auch bei dieser Vereinzelung der Säcke ergeben sich durch die Reibung des jeweils obersten Sackes auf dem darunterliegenden Sack des Stapels die bereits genannten elektrostatischen Aufladungen mit den hierdurch bedingten Nachteilen. Es kommt daher häufig vor, daß beim Entnehmen nicht nur ein einzelner Sack, sondern gleichzeitig mehrere Säcke erfaßt werden, die zu einer Behinderung oder notwendigen Unterbrechung des nachgeschalteten Arbeitsvorganges führen.Even with this separation of the sacks, the above-mentioned electrostatic charges result from the friction of the uppermost sack on the sack of the stack below, with the disadvantages caused thereby. It is therefore often the case that not only a single sack but also several sacks are detected during removal, which lead to a hindrance or necessary interruption of the subsequent work process.

Es ist weiterhin bekanntgeworden (DE-AS 26 31 599), gestapelte in einem Magazin befindliche Schlauchstücke für die Sack- oder Beutelherstellung zu vereinzeln, indem jedoch abweichend von vorliegender Erfindung jeweils das im Stapel unterste Schlauchstück erfaßt und einem Weiterförderer zugeleitet wird. Zur Entnahme des im Stapel untersten Schlauchstückes dienen sowohl um ihre Längsachse als auch mit ihren Längsachsen entlang einer Kreisbahn bewegte Trommeln. Diese weisen in einer Ausnehmung der Umfangsflöche in Reihe angeordnete Sauger auf, welche den jeweils untersten Schlauchabschnitt entlang einer Längskante erfassen und bei der Weiterbewegung der Trommeln festhalten, so daß der erfaßte Schlauchabschnitt auf den Umfang der jeweiligen Trommel aufgewickelt und einem Weiterförderer übergeben wird. Bei dieser Entnahme der Schlauchabschnitte erfolgt zwar kein seitliches Abziehen des zu entnehmenden Schlauchabschnittes, so daß elektrostatische Aufladungen weitgehend vermieden werden, jedoch bedingt dieses Entnahmeverfahren eine sehr aufwendige Vorrichtung und erfordert außerordentlich große Saugkräfte. Der unterste Schlauchabschnitt des Stapels wird nämlich von dem darüberbefindlichen Stapel fest gegen die von dem Stapelschacht gebildeten und notwendigen Auflageflächen für die Ränder des Stapels gedrückt, so daß entsprechende Saugkräfte auf den Kantenbereich ausgeübt werden müssen, um den zu erfassenden Schlauchabschnitt mit seinem aufliegenden Kantenbereich von dem Stapel abziehen zu können.It has also become known (DE-AS 26 31 599) to separate stacked hose pieces located in a magazine for sack or bag production, however, in deviation from the present invention, the bottom hose piece in the stack is detected and fed to a further conveyor. Drums which are moved about their longitudinal axis and with their longitudinal axes along a circular path are used to remove the lowest tube piece in the stack. These have suction cups arranged in a row in a recess of the circumferential surfaces, which grip the bottom hose section along a longitudinal edge and hold it in place during the further movement of the drums, so that the detected hose section is wound onto the circumference of the respective drum and transferred to a further conveyor. When the hose sections are removed, there is no lateral pulling off of the hose section to be removed, so that electrostatic charges are largely avoided, but this removal process requires a very complex device and requires extraordinarily high suction forces. The bottom hose section of the stack is namely pressed firmly by the stack above it against the necessary support surfaces for the edges of the stack formed by the stack shaft, so that corresponding suction forces must be exerted on the edge region in order for the hose section to be detected with its edge region lying on top of it To be able to pull off the stack.

Zur Zuführung von auf einem Stapel befindlichen Bögen zu einem Ablegetisch (DE-PS 251 342) ist eine Lösung vorgesehen, bei der ein Saugrohr schwingend an einem Kurbelarm gehalten ist und in seiner untersten Stellung den obersten Bogen des Stapels an einer seiner Längskanten erfaßt und im Zuge einer auf einem Kreisbogen nach oben gerichteten Schwenkbewegung die erfaßte Längskante anhebt und zunächst in Richtung der gegenüberliegenden Längskante bewegt, so daß der erfaßte Bogen zumindest über einen erheblichen Teil seiner Länge nach Art einer Schälbewegung von dem Stapel abgenommen wird. Der Greifer übergibt den Bogen in seiner obersten Stellung zusammenwirkenden Zuführwalzen, die den Bogen auf den Ablegetisch weiterfördern. Bei dieser bekannten Ausführung wird der Bogen jedoch nicht gewendet, sondern so auf den Ablegetisch überführt, daß seine auf dem Stapel befindliche Oberseite auch auf dem Ablegetisch nach oben weist. Soweit bei dieser bekannten Lösung der jeweils oberste Bogen eines Stapels durch eine Art Abschälbewegung von dem Stapel entnommen wird, kann eine elektrostatische Aufladung vermieden werden, jedoch besteht auch bei dieser bekannten Lösung die Gefahr, daß zumindest gegen Ende der Entnahme des obersten Bogens dieser auf dem Stapel entlanggleitet und hierdurch elektrostatische Aufladungen verursacht.For feeding sheets on a stack to a deposit table (DE-PS 251 342), a solution is provided in which a suction tube is swingingly held on a crank arm and in its lowest position detects the top sheet of the stack on one of its longitudinal edges and in In the course of a pivoting movement directed upwards on a circular arc, the detected longitudinal edge lifts and first moves in the direction of the opposite longitudinal edge, so that the detected arc is removed from the stack in the manner of a peeling movement at least over a considerable part of its length. The gripper passes the sheet in its uppermost position to cooperating feed rollers which convey the sheet on to the depositing table. In this known embodiment, however, the sheet is not turned over, but is transferred to the lay-up table in such a way that its top, which is on the stack, also goes up on the lay-up table points. To the extent that in this known solution the top sheet of a stack is removed from the stack by a kind of peeling movement, electrostatic charging can be avoided, but even with this known solution there is a risk that at least towards the end of the top sheet removal on the Stack slides along and causes electrostatic charges.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs beschriebenen Art so auszubilden, daß nicht nur eine elektrostatische Aufladung der Kunststoffolienstücke durch ihre Entnahme vermieden wird, sondern darüber hinaus auch eine sichere Trennung der Ränder der übereinanderliegenden Folienstücke erreicht wird, wenn die Ränder der Folienstücke durch mechanische Verbindungen oder durch Aneinanderkleben oder aber durch den vorherigen Schweiß- oder Trennvorgang bedingte Haftkräfte miteinander verbunden sind. Zur Lösung vorstehender Aufgabe kennzeichnet sich das einleitend genannte Verfahren erfindungsgemäß dadurch, daß die Längskante der als Säcke oder Schlauchabschnitte ausgebildeten Kunststoffolienstücke nur in einem Eckbereich durch Ansaugen angehoben und um einen Winkelbereich von etwa 90° verschwenkt wird und das anschließende Abziehen der obersten Lage parallel zur Stapelebene so durchgeführt wird, daß eine horizontale Verschiebung des auf dem Stapel verbleibenden Abschnittes des ergriffenen Sackes oder Schlauchabschnittes vermieden wird.The invention has for its object to provide a method of the type described in such a way that not only an electrostatic charging of the plastic film pieces is avoided by their removal, but also a safe separation of the edges of the superimposed film pieces is achieved when the edges of the film pieces adhesive forces caused by mechanical connections or by sticking to one another or by the previous welding or cutting process are connected to one another. To solve the above problem, the method mentioned in the introduction is characterized according to the invention in that the longitudinal edge of the plastic film pieces designed as sacks or tube sections is raised by suction only in one corner region and pivoted by an angular range of approximately 90 ° and the subsequent removal of the top layer parallel to the stacking plane is carried out in such a way that a horizontal displacement of the portion of the gripped sack or tube portion remaining on the stack is avoided.

Das Anheben des obersten Sackes oder Schlauchabschnittes im Eckbereich des Stapels ist vorteilhaft, weil hier die Haftkräfte zwischen den aufeinanderliegenden Säcken oder Schlauchabschnitten am geringsten sind. Der jeweilige Eckabschnitt kann nach seiner Verschwenkung um etwa 90° erfaßt und parallel zur Stapeloberfläche bewegt werden, so daß eine Schälbewegung etwa entlang parallel zur Diagonalen des Sackes oder Folienstückes verlaufender Trennlinien erfolgt und hierdurch eine sichere Trennung der sich an die angehobene Ecke anschließenden Randbereiche des zu vereinzelnden Sackes oder Schlauchabschnittes begünstigt wird. Ggfs. bestehende Randverbindungen zwischen dem obersten und dem darunterliegenden Sack oder Schlauchabschnitt werden bei dieser Art des Abziehens aufgetrennt und damit eine sichere Vereinzelung der Säcke oder Schlauchabschnitte erreicht.Raising the uppermost sack or hose section in the corner region of the stack is advantageous because the adhesive forces between the sacks or hose sections lying on top of each other are lowest here. The respective corner section can be gripped by about 90 ° and moved parallel to the stack surface, so that a peeling movement takes place along parallel lines parallel to the diagonal of the sack or piece of film and thereby a safe separation of the edge areas of the raised corner adjoining singular sack or hose section is favored. If necessary. Existing edge connections between the uppermost and the underlying sack or hose section are separated with this type of pulling off and thus a reliable separation of the sacks or hose sections is achieved.

Beim Abnehmen und Wenden eines einseitig offenen Sackes ist es vorteilhaft, wenn dieser im Bodenbereich der Längskante angehoben und verschwenkt wird. Infolge der Bodennaht weisen die gestapelten Säcke im Bereich der bodenseitigen Längskante einen größeren Abstand zueinander auf, so daß die von der Bodenkante und der Längskante gebildeten Ecken von der Ansaugeinrichtung leichter erfaßt werden können als die Ecken im Bereich der Sacköffnung. Da die Säcke nach Herstellung der Bodennaht übereinandergestapelt werden, ist es nicht auszuschließen, daß die noch warmen Schweißnähte insbesondere im Bodenbereich zu einer mechanischen Verbindung zwischen benachbarten Säcken führen. Durch das beschriebene Anheben im Eckbereich des Bodens des Sackes und die nachfolgende -Abziehbewegung wird ein besonders günstiger Abrißwinkel zwischen den im Bereich der Bodenkante gegebenenfalls zusammenhaftenden Säcke erzielt.When removing and turning a sack that is open on one side, it is advantageous if it is raised and pivoted in the bottom region of the longitudinal edge. As a result of the bottom seam, the stacked sacks are at a greater distance from one another in the area of the bottom longitudinal edge, so that the corners formed by the bottom edge and the longitudinal edge can be more easily grasped by the suction device than the corners in the area of the sack opening. Since the sacks are stacked on top of each other after the bottom seam has been produced, it cannot be ruled out that the still warm weld seams, particularly in the bottom area, lead to a mechanical connection between adjacent sacks. The described lifting in the corner region of the bottom of the sack and the subsequent pull-off movement result in a particularly favorable tear-off angle between the sacks which may stick together in the region of the bottom edge.

Zur Durchführung des Verfahrens geht die Erfindung von einer Vorrichtung aus, welche eine heb- und senkbare Ansaugeinrichtung mit wenigstens einem Saugkopf und eine mit diesem Saugkopf zusammenwirkende Greifereinrichtung auf weist. Diese Vorrichtung kennzeichnet sich erfindungsgemäß dadurch, daß der Saugkopf über einen Schwenkarm mit einer etwa horizontal sowie zu den Kanten des Stapels geneigt verlaufenden Achse verbunden und um eine weitere quer hierzu verlaufende Achse in der Ebene der Auflagefläche des Saugkopfes verschwenkbar gehalten ist, daß zum Erfassen des vom Saugkopf abgehobenen Längskantenabschnittes und zum Ablegen des Sackes oder Schlauchfolienabschnittes eine horizontal bewegbare Greifereinrichtung vorgesehen ist, deren vertikaler Abstand zum Stapel geringer ist als die Länge des Sackes oder Schlauchfolienabschnittes in Bewegungsrichtung der Greifereinrichtung, und daß der Stapel auf seiner dem abgelegten Sack oder Schlauchfolienabschnitt zugekehrten Stirnseite an einem Anschlag anliegt.To carry out the method, the invention is based on a device which has a lifting and lowering suction device with at least one suction head and a gripper device which interacts with this suction head. This device is characterized according to the invention in that the suction head is connected via a swivel arm to an axis running approximately horizontally and inclined to the edges of the stack and is held pivotably about a further axis extending transversely thereto in the plane of the bearing surface of the suction head in such a way that for detecting the a longitudinally movable gripper device is provided for depositing the sack or tubular film section, the vertical distance from the stack being less than the length of the sack or tubular film section in the direction of movement of the gripper device, and that the stack on its end facing the deposited sack or tubular film section abuts a stop.

Da die etwa horizontal verlaufende Schwenkachse des Saugkopfes gegenüber den Kanten des Stapels geneigt ist, verläuft die Trennlinie beim Abheben des Sackes wenigstens bis zur Übernahme des Längskantenabschnittes durch die Greifereinrichtung parallel zur Schwenkachse über eine Ecke des Stapels. Sobald die Ecke des Sackes oder Schlauchfolienabschnittes durch die Ansaugeinrichtung aufgerichtet ist, kann die Greifereinrichtung einen der Ecke benachbarten Längsabschnitt erfassen, um anschließend den Sack oder Schlauchfolienabschnitt von Stapel abzuziehen. Der am Rande des Stapels angeordnete Anschlag sorgt dafür, daß während der Bewegung der Greifereinrichtung beim Abnehmen des Sackes oder Schlauchfolienabschnittes dieser nicht relativ zum Stapel verschoben wird, so daß elektrostatische Aufladungserscheinungen vermieden werden. Da der vertikale Abstand der Greifereinrichtung zum Stapel geringer ist als die Länge des Sackes oder Schlauchfolienabschnittes in Abziehrichtung, wird die Oberseite des Sackes beim Abziehen nach unten gewendet, wodurch sich ein seitenverkehrtes Ablegen des Sackes ergibt.Since the approximately horizontal pivot axis of the suction head is inclined with respect to the edges of the stack, the dividing line runs parallel to the pivot axis over a corner of the stack when the sack is lifted off, at least until the longitudinal edge section is taken over by the gripper device. As soon as the corner of the sack or tubular film section is erected by the suction device, the gripper device can grip a longitudinal section adjacent to the corner in order to subsequently pull the sack or tubular film section from the stack. The stop arranged at the edge of the stack ensures that during the movement of the gripper device when the sack or tubular film section is removed it is not displaced relative to the stack, so that electrostatic charging phenomena are avoided. Since the vertical distance between the gripper device and the stack is less than the length of the sack or tubular film section in the pulling direction, the top of the sack is turned downwards when the sack is pulled off, which results in the sack being reversed.

Zweckmäßigerweise ist die Vorrichtung mit einem verschwenkbaren Niederhalter ausgerüstet, welcher nach dem Anheben des Eckabschnittes des Sackes oder Schlauchfolienabschnittes im Bereich des abgehobenen Eckabschnittes auf den Stapel aufdrückbar ist. Der Niederhalter kann somit nach dem Anheben des ersten Eckbereiches des obersten Sackes oder Schlauchfolienabschnittes, also bereits nach Trennung von sehr kurzen Längskantenabschnitten, auf den Stapel drücken und begünstigt somit das Abziehen des Sackes oder Schlauchfolienabschnittes auch bei außerhalb des Eckabschnittes mechanisch verbundenen Kanten der aufeinanderliegenden Säcke oder Schlauchfolienabschnitte. Weiterhin empfiehlt es sich, den Saugkopf um die etwa horizontale Achse längs eines Kreisbogenabschnittes über einen Winkelbereich von etwa 90° verschwenkbar anzuordnen. Der Schwenkwinkel von etwa 90° führt zum senkrechten Aufrichten des Eckabschnittes, so daß die Greifereinrichtung diesen Eckabschnitt auf einfache Weise erfassen kann.The device is expediently provided with equipped with a pivotable hold-down device which can be pressed onto the stack in the region of the raised corner section after the corner section of the sack or tubular film section has been raised. The hold-down device can thus press the stack after lifting the first corner area of the uppermost sack or tubular film section, i.e. already after separation of very short longitudinal edge sections, and thus favors the removal of the sack or tubular film section even when the edges of the sacks lying one above the other are mechanically connected or outside the corner section Tubular film sections. Furthermore, it is advisable to arrange the suction head so as to be pivotable about the approximately horizontal axis along a circular arc section over an angular range of approximately 90 °. The pivoting angle of approximately 90 ° leads to the vertical erection of the corner section, so that the gripper device can grasp this corner section in a simple manner.

Eine besonders einfache Lösung ergibt sich, . wenn die Greifereinrichtung seitlich neben dem Stapel angeordnet und mit einem Greiferkopf oberhalb des Stapels in einer etwa horizontalen Ebene längs eines Kreisbogenabschnittes verschwenkbar gehalten ist. Dabei ist es vorteilhaft, wenn die Verschwenkeinrichtung im wesentlichen aus einem um eine vertikale Achse verschwenkbaren, mit dem Greiferkopf verbundenen Gestänge besteht, wobei der Antrieb beispielsweise über eine Kolbenzylinderanordnung möglich ist.A particularly simple solution results. if the gripper device is arranged laterally next to the stack and is pivotably held with a gripper head above the stack in an approximately horizontal plane along a circular arc section. It is advantageous if the pivoting device consists essentially of a linkage which can be pivoted about a vertical axis and is connected to the gripper head, the drive being possible, for example, via a piston-cylinder arrangement.

Außerdem ist es vorteilhaft, wenn die Greifereinrichtung mit gegeneinander verschwenkbaren Klemmbacken ausgerüstet ist. Hierbei wird der von der Ansaugeinrichtung aufgerichtete Eckabschnitt in einer Klemmstellung zwischen den Backen bis zum Ablegen des Sackes gehalten. Zum Ablegen des Sackes müssen die Klemmbacken öffnen, wobei der Öffnungszeitpunkt im wesentlichen vom vertikalen Abstand zwischen den Klemmbacken und der horizontalen Ebene des Stapels abhängt.It is also advantageous if the gripper device is equipped with clamping jaws which can be pivoted relative to one another. Here, the corner section raised by the suction device is held in a clamping position between the jaws until the sack is put down. To put the sack down, the jaws have to open, the time of opening essentially depends on the vertical distance between the jaws and the horizontal plane of the stack.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispieles näher erläutert.The invention is explained in more detail below on the basis of an exemplary embodiment shown schematically in the drawing.

Es zeigen:

  • Fig. 1 die Draufsicht auf eine erfindungsgemäße Vorrichtung,
  • Fig. 2 einen Schnitt durch die Vorrichtung längs der Linie A-A gemäß Fig. i,
  • Fig. 3 eine Seitenansicht des Greifers gemäß Fig. 1,
  • Fig. 4 eine Seitenansicht des Stapels mit einem vom Saugkopf angehobenen Eckabschnitt eines Sackes,
  • Fig. 5 eine Seitenansicht gemäß Fig. 4 nach Erfassen des Eckabschnittes durch eine Greifereinrichtung und
  • Fig. 6 eine weitere Seitenansicht gemäß Fig. 4 und 5, wobei das Abziehen eines Sackes in verschiedenen Arbeitsstellungen der Greifereinrichtung dargestellt ist.
Show it:
  • 1 is a top view of a device according to the invention,
  • 2 shows a section through the device along the line AA according to FIG. I,
  • 3 shows a side view of the gripper according to FIG. 1,
  • 4 shows a side view of the stack with a corner portion of a sack raised by the suction head,
  • Fig. 5 is a side view of FIG. 4 after gripping the corner section by a gripper device and
  • 6 shows a further side view according to FIGS. 4 and 5, the removal of a sack being shown in different working positions of the gripper device.

Die in Fig. 1 dargestellte Vorrichtung dient zum Abnehmen eines einseitig offenen Sackes i von einem insgesamt mit 2 bezeichneten Stapel derartiger Säcke. Zum Abnehmen des jeweils obersten Sackes des Stapels 2 dient in einem ersten Arbeitsschritt eine Ansaugeinrichtung 3 mit einem Saugkopf 4, welcher über ein Gestänge 5 mit einer Schwenkachse 8 verbunden ist. Mittels einer Kolbenzylindereinrichtung 7 kann der Saugkopf 4 um einen Winkelbereich von etwa 90° in eine gegenüber den Seitenkanten des Stapels geneigte vertikale Ebene verschwenkt werden. In der um 90° verschwenkten Stellung sind der Saugkopf und das Gestänge gestrichelt dargestellt und mit 4a bzw. 5a gekennzeichnet. Weiterhin kann der Saugkopf 4 mit seinem Gestänge 5 mittels einer weiteren Kolbenzylinderanordnung 8 um eine Achse 8a verschwenkt werden, wie insbesondere aus Fig. 2 hervorgeht. Somit kann der Saugkopf 4 nach dem Anheben des Eckabschnittes des Sackes i zur Seite geschwenkt werden und nach erneuter Rückbewegung den Eckabschnitt des nächsten Sackes ansaugen.The device shown in FIG. 1 is used to remove a sack i which is open on one side from a stack of sacks of this type, designated overall by 2. In a first step, a suction device 3 with a suction head 4, which is connected to a swivel axis 8 via a linkage 5, serves to remove the uppermost sack of the stack 2. By means of a piston cylinder device 7, the suction head 4 can be pivoted through an angular range of approximately 90 ° into a vertical plane inclined with respect to the side edges of the stack. In the position pivoted through 90 °, the suction head and the linkage are shown in dashed lines and identified by 4a and 5a. Furthermore, the suction head 4 with its linkage 5 can be pivoted about an axis 8a by means of a further piston-cylinder arrangement 8, as can be seen in particular from FIG. 2. Thus, the suction head 4 can be pivoted to the side after lifting the corner portion of the bag i and suck the corner portion of the next bag after moving back again.

In Fig. 1 ist weiterhin eine Greifereinrichtung 9 dargestellt, deren Greiferkopf 10 mit gegeneinander verschwenkbaren Klemmbacken 11 und 12 ausgerüstet ist. Der Greiferkopf 10 ist über Stangen 13 und 14 mit einem ortsfesten Gestell 15 verbunden. Der Greiferkopf 10 mit seinen Klemmbacken 11 und 12 ist um eine gestellfeste vertikale Achse 16 längs eines Bogenabschnittes in Richtung der Doppelpfeile 17 und 18 verschwenkbar. Als Schwenkantrieb dient eine Kolbenzylinderanordnung 19, welche einerseits mit dem Gestell 15 und andererseits mit der Stange 13 verbunden ist.1 also shows a gripper device 9, the gripper head 10 of which is equipped with clamping jaws 11 and 12 which can be pivoted relative to one another. The gripper head 10 is connected via rods 13 and 14 to a stationary frame 15. The gripper head 10 with its jaws 11 and 12 can be pivoted about a vertical axis 16 fixed to the frame along an arc section in the direction of the double arrows 17 and 18. A piston-cylinder arrangement 19 serves as the swivel drive, which is connected on the one hand to the frame 15 and on the other hand to the rod 13.

Die geöffnete Stellung der Klemmbacken 11, 12 ist in Fig.1 mit 11 a bzw. 12a bezeichnet. Auch Fig. 3 zeigt den Schwenkkopf 10 in seinen zwei Arbeitsstellungen, wobei die Klemmstellung der Klemmbacken 11,12 mit durchgezogenen Linien und die Offenstellung mit gestrichelten Linien dargestellt und mit 11 a bzw. 12a bezeichnet ist. Die Betätigung der Klemmbacken 11 und 12 erfolgt zweckmäßigerweise über eine Kolbenzylinderanordnung unter Zwischenschaltung eines Schwenkhebels.The open position of the jaws 11, 12 is designated in Fig.1 with 11 a and 12a. FIG. 3 also shows the swivel head 10 in its two working positions, the clamping position of the clamping jaws 11, 12 being shown with solid lines and the open position with dashed lines and being designated by 11 a and 12 a. The clamping jaws 11 and 12 are expediently actuated via a piston-cylinder arrangement with the interposition of a pivoting lever.

Zum Festhalten des Stapels 2 nach dem Abheben und Aufrichten des Eckabschnittes des Sackes 1 ist ein verschwenkbarer Niederhalter 20 vorgesehen, welcher über eine Kolbenzylinderanordnung 21 betätigbar ist.A pivotable hold-down device 20 is provided for holding the stack 2 after the corner section of the bag 1 has been lifted off and raised, which can be actuated via a piston-cylinder arrangement 21.

Die Funktion der Vorrichtung gemäß Fig. 1 bis 3 wird anhand der Fig. 4 bis 6 nachstehend erläutert. Zum Abheben des obersten Sackes 1 von demThe function of the device according to FIGS. 1 to 3 is explained below with reference to FIGS. 4 to 6. To lift the top sack 1 from the

Stapel 2 wird der Sack 1 an seinem Eckabschnitt 1 von dem Saugkopf 4 erfaßt. In dieser Arbeitsstellung ist der Saugkopf 4 gestrichelt dargestellt. Durch Verschwenken des Saugkopfes 4 in Richtung des Pfeiles 22 gelangt der Saugkopf in die mit 4a bezeichnete Position. In dieser Stellung steht der Eckabschnitt 1a und der sich anschließende Längskantenabschnitt etwa senkrecht zum Stapel 2, so daß der Sack 1 aneinemdem Eckabschnitt 1abenachbarten Längskantenabschnitt vom Greiferkopf 10 erfaßt werden kann. Hierzu klappen die Klemmbacken des Greiferkopfes 10 aus ihrer mit 11a und 12a bezeichneten Öffnungsstellung in ihre mit 11 und 12 bezeichnete Klemmstellung, wie dies aus Fig. 5 hervorgeht.Stack 2, the sack 1 is gripped at its corner section 1 by the suction head 4. In this working position, the suction head 4 is shown in dashed lines. By swiveling the suction head 4 in the direction of arrow 22, the suction head arrives in the position denoted by 4a. In this position, the corner section 1a and the subsequent longitudinal edge section approximately perpendicular to the stack 2, so that the sack 1 can be gripped by the gripper head 10 at a longitudinal edge section adjacent to the corner section 1a. For this purpose, the clamping jaws of the gripper head 10 fold out of their opening position designated 11a and 12a into their clamping position designated 11 and 12, as can be seen from FIG. 5.

Nach dem Erfassen des Sackes 1 durch die Klemmbacken 11 und 12 wird der in zwei Ebenen verschwenkbare Saugkopf 4 in seine Ausgangslage seitlich neben den Stapel zurückbewegt, wie dies in Fig. 2 gestrichelt dargestellt ist. Während der Rückbewegung des Saugkopfes 4 wird der Sack 1 von dem Greiferkopf 10 nach Art einer Schälbewegung in Richtung der Pfeile 23 und 24 vom Stapel 2 abgezogen. Am Rande des Stapels 2 ist ein Anschlag 26 vorgesehen, damit der während des Abziehens auf dem Stapel 2 noch aufliegende Abschnitt des Sackes 1 nicht horizontal verschoben wird. Da außerdem der Abstand zwischen dem Greiferkopf 10 und dem Stapel 2 geringer als die Länge des Sackes 1 gewählt ist, wird der Sack 1 beim Abnehmen vom Stapel 2 umgelegt, so daß er mit seiner ursprünglichen Oberseite nach unten zu liegen kommt. Nach der vollständigen Abnehmen des Sackes 1 vom Stapel 2 wird der Sack 1 durch die Weiterbewegung des Greiferkopfes 10 in Richtung des Pfeiles 25 neben dem Stapel 2 abgelegt. In dieser Stufe des Verfahrens öffnen die Klemmbacken 11 und 12, so daß auch der eingeklemmte Abschnitt des Sackes 1 auf eine Ablagefläche 27 fällt.After the sack 1 has been gripped by the clamping jaws 11 and 12, the suction head 4, which can be pivoted in two planes, is moved back to its starting position laterally next to the stack, as shown in broken lines in FIG. 2. During the return movement of the suction head 4, the sack 1 is pulled off the stack 2 by the gripper head 10 in the manner of a peeling movement in the direction of the arrows 23 and 24. At the edge of the stack 2, a stop 26 is provided so that the portion of the bag 1 still resting on the stack 2 during the pulling-off is not displaced horizontally. In addition, since the distance between the gripper head 10 and the stack 2 is chosen to be less than the length of the sack 1, the sack 1 is folded over when it is removed from the stack 2, so that it comes to lie with its original top down. After the sack 1 has been completely removed from the stack 2, the sack 1 is deposited next to the stack 2 by the further movement of the gripper head 10 in the direction of the arrow 25. In this stage of the method, the clamping jaws 11 and 12 open, so that the clamped section of the bag 1 also falls onto a storage surface 27.

Die Ablagefläche 27 kann eine Fördereinrichtung sein, welche den Sack 1 zu einer Abfülleinrichtung zum Befüllen des Sackes transportiert. Die Position des Greiferkopfes 10 in der Abwurfstellung 10a ist auch in Fig. 1 dargestellt. Nach dem Abwurf des Sackes 1, also nach dem Öffnen der Klemmbacken 11 und 12, wird der Greiferkopf 10 in der Darstellung gemäß Fig. 6 nach links in seine Ausgangsposition zurückgeschwenkt. Dieser Schwenkbereich ist auch in Fig. 1 durch die mit den Doppelpfeilen 17 und 18 gekennzeichneten Linien dargestellt.The storage surface 27 can be a conveyor device that transports the bag 1 to a filling device for filling the bag. The position of the gripper head 10 in the discharge position 10a is also shown in FIG. 1. After the sack 1 has been ejected, that is to say after the clamping jaws 11 and 12 have been opened, the gripper head 10 is pivoted back to the left into its starting position in the illustration according to FIG. 6. This pivoting range is also shown in FIG. 1 by the lines marked with the double arrows 17 and 18.

Bei dem vorstehend beschriebenen Abziehvorgang werden alle Bereiche des Sackes 1 etwa vertikal zu den darunterliegenden Säcken abgehoben, und eine horizontale Verschiebung des Sackes 1 auf dem Stapel 2 wird vermieden. Auf diese Weise kommt es nicht mehr zu elektrostatischen Aufladungen. welche das Abnehmen einzelner Säcke erschweren oder unmöglich machen. Durch das Ergreifen des Sackes mit dem Saugkopf 4 an seinem Eckabschnitt können ggf. vorhandene mechanische Verbindungen in denIn the pull-off process described above, all areas of the sack 1 are lifted approximately vertically to the sacks underneath, and a horizontal displacement of the sack 1 on the stack 2 is avoided. In this way, there is no longer any electrostatic charge. which make it difficult or impossible to remove individual bags. By gripping the bag with the suction head 4 at its corner section, any mechanical connections that may be present in the

Randbereichen benachbarter aufeinanderliegender Säcke des Stapels 2 während des Abziehvorganges leicht aufgerissen werden, so daß auch hierdurch eine sichere Vereinzelung der Säcke ermöglicht wird.Edge areas of adjacent stacked sacks of the stack 2 are easily torn open during the pulling-off process, so that this also enables reliable separation of the sacks.

Claims (7)

1. A method of removing and turning over the current top layer of a pile (2) of rectangular plastics sheet articles (1) wherein the current top layer is lifted in the region of a longitudinal edge by suction and swung horizontally through an angular range, and wherein the swung portion of longitudinal edge is grasped by a gripper device (9), withdrawn parallel to the plane of the pile in the direction of the opposite longitudinal edge and beyond, and deposited, face downwards, beside the pile (2), the vertical distance of the gripper device (9) from the pile being shorter than the width of the plastics sheet article, characterised in that the longitudinal edge of the plastics sheet articles (1), which are constructed in the form of bags or lengths of hose, is only lifted by suction in one corner region and swung horizontally over an angular range of about 90° and the subsequent withdrawal of the top layer parallel to the plane of the pile is carried out so that a horizontal displacement of the portion of the grasped bag or length of hose remaining on the pile (2) is avoided.
2. A method as claimed in Claim 1, characterised in that when bags open at one side are removed and turned over, these are lifted and swung in the bottom region of the longitudinal edge.
3. An apparatus for carrying out the method as claimed in Claim 1 or 2, which comprises a suction device able to be raised and lowered and having at least one suction head, and a gripper device cooperating with this suction head, characterised in that the suction head (4) is connected, through a swivel arm (5), to a substantially horizontal pin (6) extending inclined to the edges of the pile (2) and is held for swinging in the plane of the contact surface of the suction head about a further pin (8a) extending transversely to the first, that in order to grasp the portion of longitudinal edge lifted by the suction head (4) and to deposit the bag (1) or length of tubular sheet, a gripper device (9) is provided which is movable horizontally and the vertical distance of which from the pile (2) is shorter than the dimension of the bag (1) or length of tubular sheet in the direction of movement of the gripper device and that the pile bears against a stop (26) at its end face adjacent to the deposited bag (1) or length of tubular sheet.
4. An apparatus as claimed in Claim 3, characterised by a pivotable holding-down means (20) which can be pressed onto the pile (2) in the region of the lifted corner portion after the corner portion (1a) of the bag (1) or length of tubular sheet has been lifted.
5. An apparatus as claimed in any of the preceding Claims, characterised in that the suction head (4) can be swung about the pin (6) along a portion of an arc over an angular range (22) of about 90°.
6. An apparatus as claimed in any of the preceding Claims, characterised in that the gripper device (9) is disposed laterally beside the pile (2) and is held with a gripper head (10) pivotable above the pile (2) in a substantially horizontal plane along a portion of an arc.
7. An apparatus as claimed in any of the preceding Claims, characterised in that the gripper device (9) is equipped with clamping jaws (11, 12) which can be pivoted towards one another.
EP19830111270 1982-11-15 1983-11-11 Method and apparatus for repeatedly removing and turning the top layer of a stack of rectangular plastic foil pieces Expired EP0111739B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823242181 DE3242181C2 (en) 1982-11-15 1982-11-15 Method for removing and turning the top layer of a stack of rectangular pieces of plastic film and device for carrying out the method
DE3242181 1982-11-15

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EP0111739A1 EP0111739A1 (en) 1984-06-27
EP0111739B1 true EP0111739B1 (en) 1986-12-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109399225A (en) * 2017-08-15 2019-03-01 伯曼集团公司 For face shape object, the separated device of especially valve bag

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124077C2 (en) * 1991-07-19 1995-03-09 Fraunhofer Ges Forschung Device for receiving limp flat parts
DE69414988T2 (en) * 1993-12-21 1999-05-27 Central Glass Co., Ltd., Ube, Yamaguchi Method and device for handling foils
FR2940260B1 (en) * 2008-12-19 2010-12-24 Maf Agrobotic DEVICE FOR TREATING AT LEAST ONE FLEXIBLE ARTICLES WITH AT LEAST ONE DELIASSEUR
DE102019105495B4 (en) * 2019-03-05 2022-09-15 Held-Systems Gmbh Removal device for the automated removal of fabric material parts, a method for the automated removal of fabric material parts and a production plant with a conveyor device and a removal device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE251342C (en) *
GB280688A (en) * 1926-10-16 1927-11-24 Arthur Burroughes Evans Improvements relating to sheet feeding apparatus for printing machines
DE680582C (en) * 1935-08-11 1939-09-01 Heinrich Rohrbacher Fa Device for separating relatively stiff, vertically stacked workpieces by means of cyclically operating suction cups
US2973610A (en) * 1958-06-27 1961-03-07 Ralph S Randall Bag filling machine
DE2003087C3 (en) * 1970-01-23 1975-09-11 Windmoeller & Hoelscher, 4540 Lengerich Device for the automatic loading of the stacking magazine of bag machines with tube packages
US3599970A (en) * 1969-05-23 1971-08-17 Smithe Machine Co Inc F L Apparatus for feeding blanks from the bottom of a stack
DE2328007C2 (en) * 1973-06-01 1975-07-10 Vits-Maschinenbau Gmbh, 4018 Langenfeld Turning and separating device for the top sheet of a stack
AT328963B (en) * 1973-12-04 1976-04-26 Voest Ag METHOD OF REMOVING A SINGLE-SIDED SACK FROM A STACK OF SUCH SACKS AND PLUGGING THE REMOVED BAG ON A BAG SPOUT AND DEVICE FOR CARRYING OUT THE PROCEDURE
DE2631599C2 (en) * 1976-07-14 1978-06-08 Gartemann & Hollmann Gmbh, 4800 Bielefeld Device for separating stacked tube pieces for the production of sacks or bags

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109399225A (en) * 2017-08-15 2019-03-01 伯曼集团公司 For face shape object, the separated device of especially valve bag

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EP0111739A1 (en) 1984-06-27
DE3242181C2 (en) 1984-09-13
DE3242181A1 (en) 1984-05-17

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