EP1667913B1 - Method for filling sacks - Google Patents

Method for filling sacks Download PDF

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Publication number
EP1667913B1
EP1667913B1 EP03740220A EP03740220A EP1667913B1 EP 1667913 B1 EP1667913 B1 EP 1667913B1 EP 03740220 A EP03740220 A EP 03740220A EP 03740220 A EP03740220 A EP 03740220A EP 1667913 B1 EP1667913 B1 EP 1667913B1
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EP
European Patent Office
Prior art keywords
bag
filling
tongs
pair
gripper
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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 - Lifetime
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EP03740220A
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German (de)
French (fr)
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EP1667913A1 (en
Inventor
Konrad Tetenborg
Hans-Ludwig Voss
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Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Publication of EP1667913A1 publication Critical patent/EP1667913A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
    • B65B43/42—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation
    • B65B43/46—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation using grippers
    • B65B43/465—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation using grippers for bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
    • B65B43/42—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation
    • B65B43/54—Means for supporting containers or receptacles during the filling operation

Definitions

  • the invention relates to a method and a device according to the preamble of claim 1 and 8.
  • the generic filling of sacks takes place with a variety of devices. Often, the bag to be filled during the filling process is detected by a plurality of pairs of gripper tongs. A subgroup within the filling machines form the so-called FFS machines. Here, the abbreviation FFS stands for Form Fill and Seal, so that a special characteristic of the operation of these machines lies in the welding of the bags after the filling process.
  • FFS Form Fill and Seal
  • Such a device is known inter alia from DE 199 36 660 A1.
  • the pliers of a pair of gripper tongs are first moved towards each other and opened using suction of the hose section for the purpose of lowering a hopper. Even before the start of the filling process, a second pair of gripper tongs engages the sack.
  • the sack material between the pair of gripper tongs may be subjected to different mechanical stresses than the remaining sack material, especially during the filling process.
  • the mechanical stress gradients forming in the bag material have a number of disadvantages. So can the bag material in be stretched different ways, which in particular leads to an impairment of the visual appearance of the bag. Also, the further processing of the bags, which consists in FFS machines primarily in the closing of the bags by welding, can be significantly affected. If, for example, one of the pairs of gripper tongs releases the sack after the filling process, the material relaxes again so that the upper sack edge warps. When this warped sack edge is welded, an odd welding seam is created, which in any case is visually unattractive and may even have leaks.
  • the object of the present invention is to propose a method and a device which prevent the formation of mechanical stress gradients in the bag material during filling.
  • control device present in the machine controls at least one (80) of the at least two gripper pairs (76, 80) which touch the bag to be filled during the filling process in that the at least one gripper pair (80) allows bag material to slide through its pliers within at least a period of time during the filling process.
  • the pair of gripper tongs through the forceps of which the sack material is intended to slide, is first closed with great force and thus great speed. At or immediately after the beginning of the filling process, the force closing the tongs is reduced or even eliminated taken away, so that they allow the sliding of the bag material. Furthermore, it is advantageous if, after completion of the filling process, the pliers of the aforementioned pair of gripper tongs are again closed with great force, then this pair of gripper tongs can take over immediately the removal of the bag. In this context, it is of great advantage to control the control of the closing force of the pliers depending on the level of the bag. The necessary measurement of the same can advantageously be carried out by weighing devices and / or optical sensors. In particular, with known and even course of the filling process, a calculation of the level as a function of time is conceivable.
  • Figure 1 shows a device with a relatively short length for the manufacture, filling, closing and discharge of bags made of thermoplastic material, in which all processing stations are arranged in a single machine frame.
  • a rolling device 16 for a wound up to a supply roll tubular film web of thermoplastic Plastic, preferably with gussets, arranged in a tubular film roll 18 is mounted.
  • the withdrawn from the tubular film roll 18 tubular film web 20 is cyclically pulled forward by a feed roller pair 22 via pulleys.
  • tubular film web is pulled out by a pendulum roller 28 to a web loop, which forms a web storage, from which the cyclically advanced tubular film web is withdrawn and thereby refilled during the standstill phases of the tubular film web 20 in that the pendulum roller 28 subtracts such a large portion from the supply roll 18 that the loop again receives its length storing the length of the section.
  • the pendulum roller 28 is mounted between two levers 30 mounted in the machine frame, which is cyclically pivoted by a pneumatic cylinder 31 from its pivoted-out into its pivoted position shown.
  • the feed roller pair 22 pulls the over the pulley 32 expiring tubular film web 20 in the vertical direction and pushes them between a transverse welding and cross-cutting device 34 therethrough.
  • This transverse welding and cross-cutting device has, in a manner known per se, two cooperating welding jaws and a cutting blade.
  • a coupling-forming support 40 is mounted to form a four-joint system, which is connected to an obliquely projecting Krag Federation 42, at the laterally below the opening edges of the tube sections, a first pair of gripper tongs 44 is arranged is indicated by the illustrated gripping jaws.
  • a crank rod 46 is articulated, which is reciprocated by a driven by a geared motor 48 crank 50.
  • the pivoting movement of the carrier 40 is so great that the sack portion 58 below the transverse welding and cross-cutting device 34 detecting gripper pair 44 the bag section by a stroke length along the circular arc 52 into a transfer station 54th promotes in which the gripping tongs 44 passes the bag section to a stationary gripper pair 57.
  • the pair of gripper tongs 57 is shown in the open position after the bag section has just been passed to the pair of gripper tongs 56.
  • the gripper pair 56 is supported by levers 62, 64, which are both hinged to a push rod 66 and form a four-joint system with their articulation points on the push rod and the grippers.
  • the lever 64 is a two-armed lever, the upper lever arm 68 is mounted fixed to the frame in the manner shown.
  • the push rod 66 is articulated to a two-armed frame-mounted lever 70, the upper lever arm is loaded in the manner shown by a tension spring 72.
  • the crank 50 is formed in the manner shown as a cam, wherein on this cam a mounted on the lower lever arm of the two-armed lever 70 cam roller 74 expires.
  • the push rod 66 is driven by its cam lever cam roller drive such that the gripper pair 56 passes the bag section leading to a pair of gripper tongs 76.
  • the pair of gripper tongs 76 engages laterally on the opening areas of the bag sections below the filling funnel 78. To open the bag section 58, both pliers of the pair of gripper tongs 76 move towards each other. At the same time, the teat couple 118 pivots over a pneumatic piston cylinder arrangement 116. As a result, the bag is pulled out laterally in the filling station in order to be able to receive the filling hopper 78 after lowering.
  • a further pair of gripper tongs 80 is arranged, which acts with great force on the bag section before the filling process, wherein the tongs have already been moved inwardly along the direction a.
  • the force applied to the forceps of the gripper pair 80 is withdrawn, so that during the Be Glallvorganges the bag section 58 can slide through the pliers.
  • the pliers of the gripper pair 80 again grip with high force on the now tightened by the contents in the vertical direction bag section 58.
  • the opening edges of the filled bag are tightened in direction a and transferred to a welding station 82, in the one in Fig. 4, not shown welding jaw pair closes the tightly drawn opening edges of the bag with a transverse weld.
  • a discharge belt 86 provided with lugs 84 is arranged, which runs over end drive and deflection rollers 88, 90 and removes the filled sacks 92 from the filling and welding stations 60, 82 in time with their filling.
  • the drive and deflection rollers 88, 90 of the conveyor belt 86 are mounted at the ends of a horizontal support 94 which can be raised and lowered in frame-fixed guides 96 by a spindle drive 98, the spindle drive 98 is driven by a geared motor 100.
  • Fig. 3 the filling station 60 is shown. Between the side parts 12 and 14, the conveyor belt 94 is arranged with its guide roller 88. On the conveyor belt 94, as already described, lugs 84 are arranged. Between the hopper 78 and the conveyor belt 94, a bag 58 which is still standing before its filling is arranged. This is held in the time shown here at the same time by the gripper pairs 80 and stationary arranged in the filling station Greiferzangenzipen 76. For gripping the gusset regions 59 of the sack 58 or for releasing the pair of gripper tongs from the gusset region 59, the gripper tongs 80 are displaced over the double knives 106 in the direction of the arrow a.
  • the stationary gripper pair of pairs 76 need not be opened by 180 ° to grip the upper bag end of the bag 58.
  • the necessary opening movement of the respective pair of forceps 102 and 104 of the stationary Claw pair 76 can be explained with reference to FIG. 2.
  • the pair of gripper tongs 102 is arranged rigidly vertically downwards, as can be seen from the illustration according to FIG.
  • the claw pair 104 which can be brought into clamping engagement with this clamping device can be pivoted open via a pneumatic piston cylinder arrangement 108, wherein the pivoting angle only encloses an acute angle. This results in a comparatively small receiving opening of the gripper pairs.
  • the fourth pair of gripper tongs 56 sweeps over a transport path 110 illustrated in phantom in FIG. 2, in which the delivery position for delivering the sack 58 to the pair of gripper tongs 76 fixedly arranged at the filling station a level which is arranged higher by a distance x than its transfer position 54 for the bag 58.
  • This height difference x is shown in FIG.
  • this gripper pair 80 After filling the bag 58, this is gripped by the gripper pair 80, as shown in Fig. 4, below the gripper pair 76 (Fig. 3). Also, this gripper pair is again, similar to the gripper pair 76, in the direction of arrow a of FIG. 3 laterally adjustable.
  • the upper edge region ie the area of the bag above the transport gripper pairs 80, the fixed jaws 102 of Greiferzangenpare 76, as shown in Fig. 2 by the dotted drawing shown, dodge. Due to the elasticity of the plastic and the restoring force caused thereby, however, this upper edge region arises again, as likewise shown in the drawing.
  • the bag which simultaneously rests on the conveyor belt 94 and is moved further along it, is then pivoted along the dotted line 112 via the transport gripper pair 80, this line representing the unimpeded movement path for the uppermost edge region of the bag 58.
  • the sack 58 occupies a position in the welding station 82 which lies below the position in the filling station 60 by a height difference x (see Fig. 4).
  • a height difference x see Fig. 4

Abstract

The invention relates to a method for filling sacks (58), comprising a device having a number of gripper tong pairs (44, 57, 76, 80), of which at least two gripper tong pairs (76, 80), during the filling process, touch the sack to be filled, and comprising a control device that controls the filling and conveying process of the sacks. The control device (76) of the at least two gripper tong pairs (76, 80), which, during the filling process, touch the sack to be filled, controls in such a manner that the at least one gripper tong pair (78) permits the sack material to be guided through the tongs thereof within at least one period of time during the filling process.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtunggemäß dem Oberbegriff des Anspruchs 1 bzw. 8. Die gattungsgemäße Abfüllung von Säcken erfolgt mit den verschiedensten Vorrichtungen. Oft wird der zu befüllende Sack während des Abfüllprozesses von einer Mehrzahl von Greiferzangenpaaren erfasst.
Eine Untergruppe innerhalb der Abfüllmaschinen bilden die sogenannten FFS-Maschinen. Hierbei steht das Kürzel FFS für Form Fill and Seal, so dass ein besonderes Kennzeichen der Arbeitsweise dieser Maschinen in der Verschweißung der Säcke nach dem Befüllprozess liegt.
Eine solche Vorrichtung ist unter anderem aus der DE 199 36 660 A1 bekannt. Dort wird ein mit einer Bodenschweißnaht versehener Schlauchabschnitt aus thermoplastischem Kunststoff in einer Füllstation mit Füllgut befüllt. Dazu werden zunächst die Zangen eines Greiferzangenpaares aufeinander zu bewegt und unter Verwendung von Saugern der Schlauchabschnitt zum Zwecke des Absenkens eines Fülltrichters geöffnet. Noch vor dem Beginn des Befüllvorganges greift ein zweites Greiferzangenpaar an den Sack an.The invention relates to a method and a device according to the preamble of claim 1 and 8. The generic filling of sacks takes place with a variety of devices. Often, the bag to be filled during the filling process is detected by a plurality of pairs of gripper tongs.
A subgroup within the filling machines form the so-called FFS machines. Here, the abbreviation FFS stands for Form Fill and Seal, so that a special characteristic of the operation of these machines lies in the welding of the bags after the filling process.
Such a device is known inter alia from DE 199 36 660 A1. There is provided with a bottom weld seam hose section made of thermoplastic material in a filling station with filling material. For this purpose, the pliers of a pair of gripper tongs are first moved towards each other and opened using suction of the hose section for the purpose of lowering a hopper. Even before the start of the filling process, a second pair of gripper tongs engages the sack.

Wenn jedoch beim Befüllen von Säcken die verschiedenen Greiferzangenpaare den Sack berühren, kann das Sackmaterial zwischen den Greiferzangenpaaren vor allem während des Befüllvorgangs anderen mechanischen Belastungen ausgesetzt sein als das restliche Sackmaterial. Die sich in dem Sackmaterial bildenden mechanischen Spannungsgradienten bringen eine Reihe von Nachteilen mit sich. So kann das Sackmaterial in unterschiedlicher Weise gedehnt werden, was insbesondere zu eine Beeinträchtigung des optischen Erscheinungsbildes des Sackes führt.
Auch die Weiterverarbeitung der Säcke, die in FFS-Maschinen in erster Linie in dem Verschließen der Säcke durch Verschweißen besteht, kann erheblich beeinträchtigt werden. Lässt beispielsweise eines der Greiferzangenpaare den Sack nach dem Befüllprozess los, entspannt sich das Material wieder, so dass sich der obere Sackrand verzieht. Wenn dieser verzogene Sackrand verschweißt wird, entsteht eine ungerade Schweißnaht, die in jedem Fall optisch unschön ist und sogar Undichtigkeiten aufweisen kann.If, however, when filling sacks, the different pairs of gripper tongs contact the sack, the sack material between the pair of gripper tongs may be subjected to different mechanical stresses than the remaining sack material, especially during the filling process. The mechanical stress gradients forming in the bag material have a number of disadvantages. So can the bag material in be stretched different ways, which in particular leads to an impairment of the visual appearance of the bag.
Also, the further processing of the bags, which consists in FFS machines primarily in the closing of the bags by welding, can be significantly affected. If, for example, one of the pairs of gripper tongs releases the sack after the filling process, the material relaxes again so that the upper sack edge warps. When this warped sack edge is welded, an odd welding seam is created, which in any case is visually unattractive and may even have leaks.

Daher besteht die Aufgabe der vorliegenden Erfindung darin, ein Verfahren und eine Vorrichtung vorzuschlagen, welche die Bildung von mechanischen Spannungsgradienten in dem Sackmaterial während der Befüllung verhindern.Therefore, the object of the present invention is to propose a method and a device which prevent the formation of mechanical stress gradients in the bag material during filling.

Die Aufgabe wird durch das Verfahren und die Vorrichtung der Ansprüche 1 und 8 gelöst, wobei die in der Maschine vorhandene Steuervorrichtung zumindest eines (80) der zumindest zwei Greiferzangenpaare (76, 80), welche während des Befüllprozesses den zu befüllenden Sack berühren, so steuert, dass das zumindest eine Greiferzangenpaar (80) innerhalb zumindest einer Zeitspanne während des Befüllprozesses zulässt, dass Sackmaterial durch seine Zangen hindurchgleitet.The object is achieved by the method and the device of claims 1 and 8, wherein the control device present in the machine controls at least one (80) of the at least two gripper pairs (76, 80) which touch the bag to be filled during the filling process in that the at least one gripper pair (80) allows bag material to slide through its pliers within at least a period of time during the filling process.

Dadurch wird gewährleistet, dass bei dem Befüllprozess keine Spannungsgradienten mehr aufgrund der mechanischen Belastung entstehen können. Vielmehr wird das Sackmaterial während des Befüllprozesses gleichmäßig belastet.This ensures that during the filling process no more voltage gradients can arise due to the mechanical load. Rather, the bag material is evenly loaded during the filling process.

Vorteilhafterweise wird das Greiferzangenpaar, durch dessen Zangen das Sackmaterial hindurchgleiten soll, zunächst mit großer Kraft und damit großer Geschwindigkeit geschlossen. Zu oder unmittelbar nach Beginn des Füllprozesses wird die die Zangen schließende Kraft herabgesetzt oder gar weggenommen, so dass sie das Hindurchgleiten des Sackmaterials erlauben. Weiterhin ist vorteilhaft, wenn nach Beendigung des Füllprozesses die Zangen des vorgenannten Greiferzangenpaares wieder mit großer Kraft verschlossen werden, dann kann dieses Greiferzangenpaar unmittelbar den Abtransport des Sackes übernehmen.
In diesem Zusammenhang ist es von großem Vorteil die Steuerung der Schließkraft der Zangen abhängig von dem Füllstand des Sackes zu regeln. Die dazu notwendige Messung desselben kann vorteilhafterweise durch Wiegevorrichtungen und/oder optische Sensoren vorgenommen werden. Insbesondere bei bekanntem und gleichmäßigem Verlauf des Füllprozesses ist auch eine Errechnung des Füllstandes als Funktion der Zeit denkbar.Advantageously, the pair of gripper tongs, through the forceps of which the sack material is intended to slide, is first closed with great force and thus great speed. At or immediately after the beginning of the filling process, the force closing the tongs is reduced or even eliminated taken away, so that they allow the sliding of the bag material. Furthermore, it is advantageous if, after completion of the filling process, the pliers of the aforementioned pair of gripper tongs are again closed with great force, then this pair of gripper tongs can take over immediately the removal of the bag.
In this context, it is of great advantage to control the control of the closing force of the pliers depending on the level of the bag. The necessary measurement of the same can advantageously be carried out by weighing devices and / or optical sensors. In particular, with known and even course of the filling process, a calculation of the level as a function of time is conceivable.

Weitere vorteilhafte Ausführungsformen und Ausführungsbeispiele der Erfindung ergeben sich aus den weiteren Ansprüchen, den Zeichnungen und der gegenständlichen Beschreibung.Further advantageous embodiments and embodiments of the invention will become apparent from the other claims, the drawings and the subject description.

Die einzelnen Figuren zeigen:

Fig 1
eine schematische Seitenansicht der Vorrichtung
Fig 2
eine der Fig. 3 entsprechenden vergrößerte Ansicht eines Teiles der Füllstation und der zweiten Schweißstation
Fig 3
eine Detailansicht der Füllstation in einer um 90° gedrehten Ansicht bezogen auf die Ansicht in Fig. 2 und
Fig 4
einer der Fig. 3 entsprechende vergrößerte Ansicht der die Sackabschnitte taktweise transportierenden Greiferzangenpaare
The individual figures show:
Fig. 1
a schematic side view of the device
Fig. 2
one of the Fig. 3 corresponding enlarged view of a part of the filling station and the second welding station
Fig. 3
a detailed view of the filling station in a rotated by 90 ° view with respect to the view in Fig. 2 and
Fig. 4
one of Fig. 3 corresponding enlarged view of the bag sections cyclically transporting Greiferzangenpaare

Figur 1 zeigt eine Vorrichtung mit verhältnismäßig kurzer Baulänge zum Herstellen, Befüllen, Verschließen und Abfördern von Säcken aus thermoplastischem Kunststoff, bei der sämtliche Bearbeitungsstationen in einem einzigen Maschinengestell angeordnet sind. An ein Ende des Maschinengestells ist an den Seitenteilen eine Abrolleinrichtung 16 für eine zu einer Vorratsrolle aufgewickelten Schlauchfolienbahn aus thermoplastischem Kunststoff, vorzugsweise mit Seitenfalten, angeordnet, in die eine Schlauchfolienrolle 18 eingehängt ist. Die von der Schlauchfolienrolle 18 abgezogene Schlauchfolienbahn 20 wird durch ein Vorzugswalzenpaar 22 über Umlenkrollen taktweise vorgezogen. Zwischen Umlenk- oder Leitwalzen 24, 26 wird die von der Vorratsrolle 18 abgezogene Schlauchfolienbahn von einer Pendelwalze 28 zu einer Bahnschlaufe ausgezogen, die einen Bahnspeicher bildet, aus dem die taktweise vorgezogene Schlauchfolienbahn abgezogen wird und der sich während der Stillstandphasen der Schlauchfolienbahn 20 dadurch wieder füllt, dass die Pendelwalze 28 einen so großen Abschnitt von der Vorratsrolle 18 abzieht, dass die Schlaufe wieder ihre die Abschnittlänge speichernde Länge erhält. Die Pendelwalze 28 ist zwischen zwei im Maschinengestell gelagerten Hebeln 30 gelagert, die taktweise von einem Pneumatikzylinder 31 aus ihrer eingeschwenkten in ihre dargestellte ausgeschwenkte Stellung verschwenkt wird.Figure 1 shows a device with a relatively short length for the manufacture, filling, closing and discharge of bags made of thermoplastic material, in which all processing stations are arranged in a single machine frame. At one end of the machine frame is on the side parts of a rolling device 16 for a wound up to a supply roll tubular film web of thermoplastic Plastic, preferably with gussets, arranged in a tubular film roll 18 is mounted. The withdrawn from the tubular film roll 18 tubular film web 20 is cyclically pulled forward by a feed roller pair 22 via pulleys. Between deflecting or guide rollers 24, 26 withdrawn from the supply roll 18 tubular film web is pulled out by a pendulum roller 28 to a web loop, which forms a web storage, from which the cyclically advanced tubular film web is withdrawn and thereby refilled during the standstill phases of the tubular film web 20 in that the pendulum roller 28 subtracts such a large portion from the supply roll 18 that the loop again receives its length storing the length of the section. The pendulum roller 28 is mounted between two levers 30 mounted in the machine frame, which is cyclically pivoted by a pneumatic cylinder 31 from its pivoted-out into its pivoted position shown.

Das Vorzugswalzenpaar 22 zieht die über die Umlenkrolle 32 ablaufende Schlauchfolienbahn 20 in vertikaler Richtung vor und schiebt diese zwischen einer Querschweiß- und Quertrenneinrichtung 34 hindurch. Diese Querschweiß- und Quertrenneinrichtung weist in an sich bekannter Weise zwei zusammenwirkende Schweißbacken und ein Schneidmesser auf.The feed roller pair 22 pulls the over the pulley 32 expiring tubular film web 20 in the vertical direction and pushes them between a transverse welding and cross-cutting device 34 therethrough. This transverse welding and cross-cutting device has, in a manner known per se, two cooperating welding jaws and a cutting blade.

Anhand der Fig. 4 kann das Transportsystem für die zu befüllenden und befüllten Säcke erläutert werden. An gestellfest gelagerten Lenkern 36, 38 ist unter Ausbildung eines Vier-Gelenk-Systems ein eine Koppel bildender Träger 40 gelagert, der mit einem schräg auskragenden Kragstück 42 verbunden ist, an dem seitlich unterhalb der Öffnungsränder der Schlauchabschnitte ein erstes Greifzangenpaar 44 angeordnet ist, das durch die dargestellten Greifbacken angedeutet ist. An dem Lenker 38 ist eine Kurbelstange 46 angelenkt, die von einer von einem Getriebemotor 48 angetriebenen Kurbel 50 hin- und herbewegt wird. Dabei ist die Schwenkbewegung des Trägers 40 so groß, dass das den Sackabschnitt 58 unterhalb der Querschweiß- und Quertrenneinrichtung 34 erfassende Greifzangenpaar 44 den Sackabschnitt um eine Taktlänge entlang des Kreisbogens 52 in eine Übergabestation 54 fördert, in der die Greifzangen 44 den Sackabschnitt an ein ortsfestes Greiferzangenpaar 57 übergibt. Dieses öffnet sich nach Erfassen des Sackabschnitts durch ein von oben her die Öffnungsränder erfassendes Greiferzangenpaar 56, das den Sackabschnitt 58 zur Füllstation 60 hin weiterfördert. In Fig. 4 ist das Greiferzangenpaar 57 in geöffneter Stellung gezeigt, nachdem der Sackabschnitt gerade an das Greiferzangenpaar 56 übergeben worden ist. Das Greiferzangenpaar 56 wird von Hebeln 62, 64 getragen, die beide an einer Schubstange 66 angelenkt sind und mit ihren Anlenkpunkten an der Schubstange und den Greifern ein Vier-Gelenk-System bilden. Der Hebel 64 ist ein zweiarmiger Hebel, dessen oberer Hebelarm 68 in der dargestellten Weise gestellfest gelagert ist. Die Schubstange 66 ist an einem zweiarmigen gestellfest gelagerten Hebel 70 angelenkt, dessen oberer Hebelarm in der dargestellten Weise von einer Zugfeder 72 belastet ist. Die Kurbel 50 ist in der dargestellten Weise als Kurvenscheibe ausgebildet, wobei auf dieser Kurvenscheibe eine auf dem unteren Hebelarm des zweiarmigen Hebels 70 gelagerte Nockenrolle 74 abläuft. Die Schubstange 66 ist durch ihren Kurvenscheiben-Hebel-Nockenrollen-Antrieb derart angetrieben, dass das Greiferzangenpaar 56 den Sackabschnitt voreilend an ein Greiferzangenpaar 76 übergibt.With reference to FIG. 4, the transport system for the bags to be filled and filled can be explained. To frame fixedly mounted arms 36, 38 is a coupling-forming support 40 is mounted to form a four-joint system, which is connected to an obliquely projecting Kragstück 42, at the laterally below the opening edges of the tube sections, a first pair of gripper tongs 44 is arranged is indicated by the illustrated gripping jaws. On the handlebar 38, a crank rod 46 is articulated, which is reciprocated by a driven by a geared motor 48 crank 50. In this case, the pivoting movement of the carrier 40 is so great that the sack portion 58 below the transverse welding and cross-cutting device 34 detecting gripper pair 44 the bag section by a stroke length along the circular arc 52 into a transfer station 54th promotes in which the gripping tongs 44 passes the bag section to a stationary gripper pair 57. This opens after detecting the bag section by a pair of gripper pair 56, which detects the opening edges from above and which further conveys the bag section 58 to the filling station 60. In Fig. 4, the pair of gripper tongs 57 is shown in the open position after the bag section has just been passed to the pair of gripper tongs 56. The gripper pair 56 is supported by levers 62, 64, which are both hinged to a push rod 66 and form a four-joint system with their articulation points on the push rod and the grippers. The lever 64 is a two-armed lever, the upper lever arm 68 is mounted fixed to the frame in the manner shown. The push rod 66 is articulated to a two-armed frame-mounted lever 70, the upper lever arm is loaded in the manner shown by a tension spring 72. The crank 50 is formed in the manner shown as a cam, wherein on this cam a mounted on the lower lever arm of the two-armed lever 70 cam roller 74 expires. The push rod 66 is driven by its cam lever cam roller drive such that the gripper pair 56 passes the bag section leading to a pair of gripper tongs 76.

Das Greiferzangenpaar 76 greift seitlich an den Öffnungsbereichen der Sackabschnitte unterhalb des Fülltrichters 78 an. Zum Öffnen des Sackabschnittes 58 bewegen sich beide Zangen des Greiferzangenpaares 76 aufeinander zu. Gleichzeitig schwenkt das Saugerpaar 118 über eine Pneumatikkolbenzylinderanordnung 116 auf. Dadurch wird der Beutel in der Füllstation seitlich ausgezogen, um den Fülltrichter 78 nach Absenkung aufnehmen zu können.The pair of gripper tongs 76 engages laterally on the opening areas of the bag sections below the filling funnel 78. To open the bag section 58, both pliers of the pair of gripper tongs 76 move towards each other. At the same time, the teat couple 118 pivots over a pneumatic piston cylinder arrangement 116. As a result, the bag is pulled out laterally in the filling station in order to be able to receive the filling hopper 78 after lowering.

An dem Träger 40 ist ein weiteres Greiferzangenpaar 80 angeordnet, das vor dem Befüllvorgang mit großer Kraft an den Sackabschnitt angreift, wobei die Zangen bereits entlang der Richtung a nach innen bewegt wurden. Zu Beginn des Befüllvorganges wird die die Zangen des Greiferzangenpaares 80 beaufschlagende Kraft zurückgenommen, so dass während des Befüllvorganges der Sackabschnitt 58 durch die Zangen gleiten kann. Nach dem Befüllvorgang greifen die Zangen des Greiferzangenpaares 80 wieder mit hoher Kraft an den nun durch das Füllgut in vertikaler Richtung gestrafften Sackabschnitt 58. Nach dem Herausfahren des Fülltrichters 78 werden die Öffnungsränder des befüllten Sackes in Richtung a gestrafft und in eine Schweißstation 82 überführt, in der ein in der Fig. 4 nicht dargestelltes Schweißbackenpaar die straff gezogenen Öffnungsränder des Sackes mit einer Querschweißnaht verschließt.On the carrier 40, a further pair of gripper tongs 80 is arranged, which acts with great force on the bag section before the filling process, wherein the tongs have already been moved inwardly along the direction a. At the beginning of the filling process, the force applied to the forceps of the gripper pair 80 is withdrawn, so that during the Befüllvorganges the bag section 58 can slide through the pliers. After the filling operation, the pliers of the gripper pair 80 again grip with high force on the now tightened by the contents in the vertical direction bag section 58. After moving out of the hopper 78, the opening edges of the filled bag are tightened in direction a and transferred to a welding station 82, in the one in Fig. 4, not shown welding jaw pair closes the tightly drawn opening edges of the bag with a transverse weld.

Unterhalb der Füllstation 60 ist ein mit Stollen 84 versehenes Abförderband 86 angeordnet, das über endseitige Antriebs- und Umlenkrollen 88, 90 läuft und die befüllten Säcke 92 im Takt ihrer Befüllung aus den Füll- und Schweißstationen 60, 82 abfördert. Die Antriebs- und Umlenkrollen 88, 90 des Förderbandes 86 sind an den Enden eines horizontalen Trägers 94 gelagert, der in gestellfesten Führungen 96 durch einen Spindeltrieb 98 heb- und senkbar ist, wobei der Spindeltrieb 98 über einen Getriebemotor 100 antreibbar ist.Below the filling station 60, a discharge belt 86 provided with lugs 84 is arranged, which runs over end drive and deflection rollers 88, 90 and removes the filled sacks 92 from the filling and welding stations 60, 82 in time with their filling. The drive and deflection rollers 88, 90 of the conveyor belt 86 are mounted at the ends of a horizontal support 94 which can be raised and lowered in frame-fixed guides 96 by a spindle drive 98, the spindle drive 98 is driven by a geared motor 100.

In Fig. 3 ist die Füllstation 60 dargestellt. Zwischen den Seitenteilen 12 und 14 ist das Förderband 94 mit seiner Umlenkwalze 88 angeordnet. Auf dem Förderband 94 sind, wie bereits beschrieben, Stollen 84 angeordnet. Zwischen dem Fülltrichter 78 und dem Förderband 94 ist ein noch vor seiner Befüllung stehender Sack 58 angeordnet. Dieser wird im hier dargestellten Zeitpunkt gerade gleichzeitig von den Greiferzangenpaaren 80 und den stationär in der Füllstation angeordneten Greiferzangenpaaren 76 gehalten. Zum Ergreifen der Seitenfaltenbereiche 59 des Sackes 58 bzw. zum Lösen der Greiferzangenpaare von dem Seitenfaltenbereich 59 werden die Greiferzangenpaare 80 über die Doppellenker 106 in Pfeilrichtung a verschoben.In Fig. 3, the filling station 60 is shown. Between the side parts 12 and 14, the conveyor belt 94 is arranged with its guide roller 88. On the conveyor belt 94, as already described, lugs 84 are arranged. Between the hopper 78 and the conveyor belt 94, a bag 58 which is still standing before its filling is arranged. This is held in the time shown here at the same time by the gripper pairs 80 and stationary arranged in the filling station Greiferzangenpaaren 76. For gripping the gusset regions 59 of the sack 58 or for releasing the pair of gripper tongs from the gusset region 59, the gripper tongs 80 are displaced over the double knives 106 in the direction of the arrow a.

Die stationären Greiferzangenpaare 76 müssen nicht um 180° geöffnet werden, um das obere Sackende des Sackes 58 zu greifen. Die notwendige Öffnungsbewegung der jeweiligen Zangenpaare 102 und 104 der stationären Greiferzangenpaare 76 kann anhand der Fig. 2 erläutert werden. Das Greiferzangenpaar 102 ist starr senkrecht nach unten angeordnet, wie sich das aus der Darstellung gemäß Fig. 2 ergibt. Das mit diesem klemmend in Eingriff bringbare Greiferzangenpaar 104 ist über eine Pneumatikkolbenzylinderanordnung 108 aufschwenkbar, wobei der Aufschwenkwinkel lediglich einen spitzen Winkel umschließt. Hierdurch ergibt sich eine vergleichsweise kleine Aufnahmeöffnung der Greiferpaare. Um das obere Sackende eines Sackes 58 sicher in diesen vergleichsweise engen Aufnahmespalt einzufädeln, überstreicht das vierte Greiferzangenpaar 56 einen in der Fig. 2 strichpunktiert dargestellten Transportweg 110, bei dem die Abgabeposition zur Abgabe des Sackes 58 an das ortsfest an der Füllstation angeordnete Greiferzangenpaar 76 in einer Ebene liegt, die um einen Abstand x höher angeordnet ist als seine Übernahmeposition 54 für den Sack 58. Diese Höhendifferenz x ist in Fig. 4 dargestellt.The stationary gripper pair of pairs 76 need not be opened by 180 ° to grip the upper bag end of the bag 58. The necessary opening movement of the respective pair of forceps 102 and 104 of the stationary Claw pair 76 can be explained with reference to FIG. 2. The pair of gripper tongs 102 is arranged rigidly vertically downwards, as can be seen from the illustration according to FIG. The claw pair 104 which can be brought into clamping engagement with this clamping device can be pivoted open via a pneumatic piston cylinder arrangement 108, wherein the pivoting angle only encloses an acute angle. This results in a comparatively small receiving opening of the gripper pairs. In order to securely thread the upper sack end of a bag 58 into this comparatively narrow receiving nip, the fourth pair of gripper tongs 56 sweeps over a transport path 110 illustrated in phantom in FIG. 2, in which the delivery position for delivering the sack 58 to the pair of gripper tongs 76 fixedly arranged at the filling station a level which is arranged higher by a distance x than its transfer position 54 for the bag 58. This height difference x is shown in FIG.

Nach Befüllen des Sackes 58 wird dieser von dem Greiferzangenpaar 80, wie in Fig. 4 dargestellt, unterhalb des Greiferzangenpaares 76 (Fig. 3) ergriffen. Auch dieses Greiferzangenpaar ist wieder, ähnlich wie das Greiferzangenpaar 76, in Pfeilrichtung a gemäß Fig. 3 seitlich anstellbar. Bei der Entnahme des befüllten und in seinem oberen Endbereich über die Greifer wieder straff gezogenen Sackes muss der obere Randbereich, also der Bereich des Sackes oberhalb der Transportgreiferpaare 80, den feststehenden Backen 102 der Greiferzangenpaare 76, wie dies in Fig. 2 durch die gestrichelte Zeichnung dargestellt, ausweichen. Aufgrund der Elastizität des Kunststoffes und der dadurch bewirkten Rückstellkraft stellt sich aber dieser obere Randbereich wieder auf, wie dies ebenfalls in der Zeichnung dargestellt ist. Über das Transportgreiferpaar 80 wird dann der Sack, der gleichzeitig auf dem Transportband 94 aufliegt und über dieses weiter bewegt wird, entlang der strichpunktierten Linie 112 verschwenkt, wobei diese Linie die ungehinderte Bewegungsbahn für den obersten Randbereich des Sackes 58 wiedergibt. Der Sack 58 nimmt in der Schweißstation 82 eine Position ein, die um eine Höhendifferenz x unterhalb der Position in der Füllstation 60 liegt (vgl. Fig. 4). Dadurch wird mittels des Greiferpaares 80 der obere Rand des Sackes nach unten gedrückt, so dass Restluft aus dem oberen Teil des befüllten Sackes herausgedrückt wird. Im Bereich der Schweißstation 82 muss das obere Sackende wiederum den Schweißbacken 114 ausweichen, wie dies ebenfalls zeichnerisch in der Fig. 2 dargestellt ist. Auch hier wird sich das obere Ende aufgrund der Eigenelastizität des Kunststoffs wieder aufstellen, so dass der straff gezogene obere Randbereich des befüllten Sackes 58 in der Schweißstation 82 verschweißt werden kann.
In allen Zeichnungen wurde auf die Darstellung einer Steuer- und einer Wägevorrichtung beziehungsweise optischer Sensoren verzichtet.After filling the bag 58, this is gripped by the gripper pair 80, as shown in Fig. 4, below the gripper pair 76 (Fig. 3). Also, this gripper pair is again, similar to the gripper pair 76, in the direction of arrow a of FIG. 3 laterally adjustable. When removing the filled and in its upper end over the gripper taut again pulled sack, the upper edge region, ie the area of the bag above the transport gripper pairs 80, the fixed jaws 102 of Greiferzangenpaare 76, as shown in Fig. 2 by the dotted drawing shown, dodge. Due to the elasticity of the plastic and the restoring force caused thereby, however, this upper edge region arises again, as likewise shown in the drawing. The bag, which simultaneously rests on the conveyor belt 94 and is moved further along it, is then pivoted along the dotted line 112 via the transport gripper pair 80, this line representing the unimpeded movement path for the uppermost edge region of the bag 58. The sack 58 occupies a position in the welding station 82 which lies below the position in the filling station 60 by a height difference x (see Fig. 4). As a result, by means of the gripper pair 80 of the upper edge of the bag after pressed down so that residual air from the upper part of the filled bag is pushed out. In the region of the welding station 82, the upper end of the sack again has to avoid the welding jaws 114, as is also shown graphically in FIG. 2. Again, the upper end is due to the inherent elasticity of the plastic set up again, so that the tightly pulled upper edge region of the filled bag 58 can be welded in the welding station 82.
In all drawings has been dispensed with the representation of a control and a weighing device or optical sensors.

Claims (10)

  1. Method of filling bags
    - having an arrangement with a plurality of pairs of gripper tongs (44, 57, 76, 80),
    - of which at least two pairs of gripper tongs (76, 80) are in contact during the filling process with the bag (58) which is to be filled, and
    - having a control arrangement which controls the filling and transporting process of the bags,
    characterized in that
    at least one (80) of the at least two pairs of gripper tongs (76, 80), which are in contact during the filling process with the bag which is to be filled, is controlled by the control arrangement such that the at least one pair of gripper tongs (80) allows the bag material to slide through its tongs within at least one period of time during the filling process.
  2. Method according to Claim 1,
    characterized in that
    at least one pair of gripper tongs (80) which allows bag material to slide through its tongs acts on the bag (58), during the filling process, beneath the pair or pairs of gripper tongs (76) which fix the bag.
  3. Method according to one of the preceding claims,
    characterized in that
    the at least one pair of gripper tongs (80) which allows bag material to slide through its tongs is closed in the first instance with a high level of force at the beginning of the filling process by the control arrangement.
  4. Method according to one of the preceding claims,
    characterized in that
    the at least one pair of gripper tongs (80) which allows bag material to slide through its tongs is closed once again with a high level of force at the end of the filling process by the control arrangement.
  5. Method according to Claim 4,
    characterized in that
    at least one pair of gripper tongs (80) which allows bag material to slide through its tongs transports the bag further following the filling process.
  6. Method according to Claim 4 or 5,
    characterized in that
    the point in time at which the control arrangement closes the tongs again with a high level of force is controlled by the control arrangement in accordance with the filling state of the bag (58).
  7. Method according to Claim 6,
    characterized in that
    the control arrangement determines the filling state of the bag with weighing scales and/or an optical sensor.
  8. Arrangement for filling bags having the following features:
    - having a plurality of pairs of gripper tongs (44, 57, 76, 80),
    - of which at least two pairs of gripper tongs (76, 80) are in contact during the filling process with the bag (58) which is to be filled, and
    - having a control arrangement which controls the filling and transporting process of the bags,
    characterized in that
    at least one (80) of the at least two pairs of gripper tongs (76, 80), which are in contact during the filling process with the bag which is to be filled, is controlled by the control arrangement such that the at least one pair of gripper tongs (80) allows the bag material to slide through its tongs within at least one period of time during the filling process.
  9. Arrangement according to Claim 8, characterized by optical sensors and/or weighing scales for monitoring the filling state of the bag during the filling operation.
  10. Arrangement according to Claim 8 or 9,
    characterized by a welding station, which seals the filled bag.
EP03740220A 2003-06-06 2003-06-06 Method for filling sacks Expired - Lifetime EP1667913B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2003/006112 WO2004108536A1 (en) 2003-06-06 2003-06-06 Method for filling sacks

Publications (2)

Publication Number Publication Date
EP1667913A1 EP1667913A1 (en) 2006-06-14
EP1667913B1 true EP1667913B1 (en) 2007-02-14

Family

ID=33495521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03740220A Expired - Lifetime EP1667913B1 (en) 2003-06-06 2003-06-06 Method for filling sacks

Country Status (6)

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EP (1) EP1667913B1 (en)
AT (1) ATE353825T1 (en)
AU (1) AU2003304176A1 (en)
DE (1) DE50306549D1 (en)
ES (1) ES2279958T3 (en)
WO (1) WO2004108536A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20051142A1 (en) * 2005-06-17 2006-12-18 Concetti Spa TRANSPORT EQUIPMENT FOR BAGS FOR FORMING AND FILLING MACHINES OF THE SAME.
DE102013105556B4 (en) * 2013-05-29 2017-05-18 Windmöller & Hölscher Kg Clamping device for clamping a bag section of a film web in a filling station of a bag filling plant
CN115477027B (en) * 2022-10-25 2023-06-30 中铁九局集团第一建设有限公司 Automatic filling equipment for ecological grass irrigation bags

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19936660C2 (en) 1999-05-04 2002-10-24 Windmoeller & Hoelscher Device for manufacturing, filling and closing bags
DE10217397B4 (en) * 2002-04-18 2007-09-13 Windmöller & Hölscher Kg Method and device for filling sacks

Also Published As

Publication number Publication date
AU2003304176A1 (en) 2005-01-04
WO2004108536A1 (en) 2004-12-16
ATE353825T1 (en) 2007-03-15
EP1667913A1 (en) 2006-06-14
ES2279958T3 (en) 2007-09-01
DE50306549D1 (en) 2007-03-29

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