EP0111739B1 - Procédé et dispositif pour retirer et retourner la couche supérieure d'une pile de feuilles plastiques rectangulaires - Google Patents

Procédé et dispositif pour retirer et retourner la couche supérieure d'une pile de feuilles plastiques rectangulaires 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
Authority
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)
English (en)
Other versions
EP0111739A1 (fr
Inventor
Friedrich Hauptstein
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.)
Librawerk Pelz & Nagel & Co Kg ik GmbH
Original Assignee
Librawerk Pelz & Nagel & Co Kg ik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Librawerk Pelz & Nagel & Co Kg ik GmbH filed Critical Librawerk Pelz & Nagel & Co Kg ik GmbH
Publication of EP0111739A1 publication Critical patent/EP0111739A1/fr
Application granted granted Critical
Publication of EP0111739B1 publication Critical patent/EP0111739B1/fr
Expired legal-status Critical Current

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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
    • 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.

Landscapes

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

Claims (7)

1) Procédé pour retirer et retourner la couche chaque fois supérieure d'une pile (2) de morceaux rectangulaires de feuille de matière synthétique (1), dans lequel on soulève par aspiration la couche chaque fois supérieure dans la région d'un bord longitudinal et on la fait pivoter d'un angle et dans lequel le tronçon de bord longitudinal que l'on fait pivoter est saisi par un dispositif preneur (9), retiré parallèlement au plan de la pile en direction du bord longitudinal opposé et au-delà et déposé à côté de la pile (2), son côté supérieur vers le bas, la distance verticale du dispositif preneur (9) à la pile étant inférieure à la largeur du morceau de feuille de matière synthétique, caractérisé en ce que l'on soulève par aspiration, dans une région d'angle seulement, le bord longitudinal des morceaux de feuille de matière synthétique conçus sous forme de sacs ou de tronçons de gaine, et en ce qu'on les fait pivoter d'un angle d'environ 90° et qu'on effectue ensuite le retrait de la couche supérieure, parallélement au plan de la pile, de telle sorte que l'on évite un coulissement horizontal du tronçon du sac ou tronçon de gaine saisi qui reste sur la pile (2).
2) Procédé selon la revendication 1, caractérisé en ce que lors du retrait et du retournement de sacs ouverts d'un côté, on soulève ceux-ci dans la région de fond du bord longitudinal et on les fait pivoter.
3) Dispositif pour la mise en oeuvre du procédé selon l'une des revendications 1 et 2, qui présente un dispositif d'aspiration pouvant être levé et abaissé avec au moins une tête d'aspiration et un dispositif preneur coopérant avec cette tête d'aspiration, caractérisé en ce que la tête d'aspiration (4) est reliée par l'intermédiaire d'un bras pivotant (5) à un axe (6) dirigé à peu près horizontalement et incliné par rapport aux bords de la pile (2) et est maintenue de manière à pouvoir pivoter dans le plan de la _ surface d'application de la tète d'aspiration autour d'un autre axe (8a) dirigé transversalement au premier, en ce que pour saisir le tronçon de bord longitudinal soulevé par la tête d'aspiration (4) et pour déposer le sac (1) ou le tronçon de feuille tubulaire est prévu un dispositif preneur mobile horizontalement (9), dont la distance verticale à la pile (2) est inférieure à la longueur du sac (1) ou du tronçon de feuille tubulaire dans la direction de mouvement du dispositif preneur, et en ce que la pile, sur son côté frontal tourné vers le sac (1) ou tronçon de feuille tubulaire déposé, est appliquée contre une butée (26).
4) Dispositif selon la revendication 3, caractérisé par un organe de retenue (20) qui, après le soulèvement du tronçon d'angle (1a) du sac (1) ou du tronçon de feuille tubulaire, peut être poussé sur la pile (2) dans la région du tronçon d'angle soulevé.
5) Dispositif selon l'une des revendications précédentes, caractérisé en ce que la tête d'aspiration (4) peut pivoter autour de l'axe (6), le long d'un tronçon d'arc de cercle, sur une région angulaire (22) d'environ 90°.
6) Dispositif selon l'une des revendications précédentes, caractérisé en ce que le dispositif preneur (9) est disposé latéralement à côté de la pile (2) et est maintenu avec une tête preneuse (10) au-dessus de la pite (2) de manière à pouvoir pivoter le long d'un tronçon d'arc de cercle dans un plan à peu près horizontal.
7) Dispositif selon l'une des revendications précédentes, caractérisé en ce que le dispositif preneur (9) est équipé de mâchoires de serrage (11, 12) pouvant pivoter l'une par rapport à l'autre.
EP19830111270 1982-11-15 1983-11-11 Procédé et dispositif pour retirer et retourner la couche supérieure d'une pile de feuilles plastiques rectangulaires Expired EP0111739B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823242181 DE3242181C2 (de) 1982-11-15 1982-11-15 Verfahren zum Abnehmen und Wenden der jeweils obersten Lage eines Stapels rechteckiger Kunststoffolienstücke und Vorrichtung zur Durchführung des Verfahrens
DE3242181 1982-11-15

Publications (2)

Publication Number Publication Date
EP0111739A1 EP0111739A1 (fr) 1984-06-27
EP0111739B1 true EP0111739B1 (fr) 1986-12-17

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EP19830111270 Expired EP0111739B1 (fr) 1982-11-15 1983-11-11 Procédé et dispositif pour retirer et retourner la couche supérieure d'une pile de feuilles plastiques rectangulaires

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EP (1) EP0111739B1 (fr)
DE (1) DE3242181C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109399225A (zh) * 2017-08-15 2019-03-01 伯曼集团公司 用于面形物、尤其阀袋的分开装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124077C2 (de) * 1991-07-19 1995-03-09 Fraunhofer Ges Forschung Einrichtung zur Aufnahme von biegeschlaffen flächigen Teilen
EP0659666B1 (fr) * 1993-12-21 1998-12-02 Central Glass Company, Limited Méthode et appareil pour la manipulation de film
FR2940260B1 (fr) * 2008-12-19 2010-12-24 Maf Agrobotic Dispositif de traitement d'au moins une liasse d'articles souples dote d'au moins un deliasseur
DE102019105495B4 (de) * 2019-03-05 2022-09-15 Held-Systems Gmbh Abnahmevorrichtung zum automatisierten Abnehmen von Gewebematerialteilen, ein Verfahren zum automatisierten Abnehmen von Gewebematerialteilen und eine Produktionsanlage mit einer Fördereinrichtung und einer Abnahmevorrichtung

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
DE251342C (fr) *
GB280688A (en) * 1926-10-16 1927-11-24 Arthur Burroughes Evans Improvements relating to sheet feeding apparatus for printing machines
DE680582C (de) * 1935-08-11 1939-09-01 Heinrich Rohrbacher Fa Vorrichtung zum Vereinzeln von verhaeltnismaessig steifen, hochkant gestapelten Werkstuecken durch taktmaessig arbeitenden Sauger
US2973610A (en) * 1958-06-27 1961-03-07 Ralph S Randall Bag filling machine
DE2003087C3 (de) * 1970-01-23 1975-09-11 Windmoeller & Hoelscher, 4540 Lengerich Vorrichtung zum selbsttätigen Beschicken des Stapelmagazins von Sackmaschinen mit Schlauchstückpaketen
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 (de) * 1973-06-01 1975-07-10 Vits-Maschinenbau Gmbh, 4018 Langenfeld Wende- und Vereinzelungsvorrichtung für den jeweils obersten Bogen eines Stapels
AT328963B (de) * 1973-12-04 1976-04-26 Voest Ag Verfahren zum abnehmen eines einseitig offenen sackes von einem stapel solcher sacke und aufstecken des abgenommenen sackes auf einen absackstutzen sowie vorrichtung zur durchfuhrung des verfahrens
DE2631599C2 (de) * 1976-07-14 1978-06-08 Gartemann & Hollmann Gmbh, 4800 Bielefeld Vorrichtung zum Vereinzeln gestapelter SchlauchstUcke für die Sackoder Beutelherstellung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109399225A (zh) * 2017-08-15 2019-03-01 伯曼集团公司 用于面形物、尤其阀袋的分开装置

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Publication number Publication date
DE3242181A1 (de) 1984-05-17
DE3242181C2 (de) 1984-09-13
EP0111739A1 (fr) 1984-06-27

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