EP0183085A1 - Device for folding the openings of filled bags - Google Patents

Device for folding the openings of filled bags Download PDF

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Publication number
EP0183085A1
EP0183085A1 EP85113950A EP85113950A EP0183085A1 EP 0183085 A1 EP0183085 A1 EP 0183085A1 EP 85113950 A EP85113950 A EP 85113950A EP 85113950 A EP85113950 A EP 85113950A EP 0183085 A1 EP0183085 A1 EP 0183085A1
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EP
European Patent Office
Prior art keywords
folding
fingers
bag
sack
folding fingers
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.)
Withdrawn
Application number
EP85113950A
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German (de)
French (fr)
Inventor
Wolfgang Schwarz
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.)
Greif Werk Maschinenfabrik GmbH
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Greif Werk Maschinenfabrik GmbH
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Filing date
Publication date
Application filed by Greif Werk Maschinenfabrik GmbH filed Critical Greif Werk Maschinenfabrik GmbH
Publication of EP0183085A1 publication Critical patent/EP0183085A1/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
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/02—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks
    • B65B7/06—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks by collapsing mouth portion, e.g. to form a single flap

Definitions

  • the invention relates to a device for folding the opening of filled sacks, in particular sacks with an inward deep fold on both narrow sides, consisting of two groups, each with three sword-like folding fingers, of which two pairs of folding fingers each from above into the opening of a sack that is conveyed upright can be moved and the third folding finger of each group can be brought into the folding position on the outside of the assigned narrow side of the bag, the folding fingers of the two pairs of folding fingers being initially adjustable transversely and then parallel to the plane of the bag and then being closed to form the deep fold while closing the The two third folding fingers can be moved into the folding position when the two folding finger pairs are unloaded.
  • the third folding finger of the two folding finger groups can be moved back and forth linearly in order to form the so-called deep fold in the upper region of the narrow sides of the filled sack. by means of a pressure medium cylinder drive. Since the third folding fingers have to travel a relatively long way between their folding position and their starting position, the pressure medium cylinder must work quickly if a satisfactory hourly performance of the device is to be achieved.
  • the hourly output to date has been around 800 sacks and no longer meets today's expectations, since, for example, the sewing or welding device arranged downstream of the folding device achieves a higher output per hour.
  • the object of the invention is to improve the device mentioned in the introduction in such a way that the third folding fingers can be operated more quickly than before.
  • the solution to the problem is based on the specified device and is characterized in that the third folding fingers are pivotable and can be brought from the folding position into a rest position, in which they are the way for the further transport of the folded bag and for the transport of the next one to be folded Release sacks.
  • This solution enables the third folding fingers to work faster, because the pressure medium cylinders for actuating these folding fingers engage the folding fingers in the vicinity of the axis of rotation of the folding fingers, so that the rest of the area of the folding fingers, which is concerned with the folding process can be moved back and forth with increased speed between the starting position and the folding position.
  • the hourly performance of the device is increased by this solution to at least 1000 to 2000 bags, which means an increase of at most about 50%.
  • Another advantage is that this solution can be carried out in a structurally simple manner, because the pressure medium cylinders in question can be arranged vertically, which makes the device more compact.
  • the proposed device is generally, but not necessarily, a component of a larger machine, which as a rule also has a closing device 2, which is not relevant here, for sewing or welding the folded openings of the filled bags, depending on whether it is paper or plastic sacks to be able to close.
  • Both devices are carried by a common stand 3, such that they are adjustable in height, as with the double arrow 4 is indicated.
  • the stand 3 is provided in a known manner with a height-adjustable block 5 to which the devices 1 and 2 are attached.
  • the device 1 consists of a horizontal support 6, a frame 8 movable thereon via rollers 7, which is moved horizontally by a traction mechanism operation 10 driven by an electric motor 9, this movement being limited or braked by means of limit switches 11 and dampers 12 and stops 13 , a guide device 16 carried by the frame 8 via a lifting cylinder 14 and guided there by rollers 15, and comprising two horizontally movable carriages 17 and 18 carried by the guide device, each with a folding finger group 19 or 20 consisting of three sword-like folding fingers.
  • a stationary crank control device 21 which interacts with the guide device 16, is provided in order to fix the forward-downward movement of the guide device and thus of the folding finger groups 19, 20 during the folding process.
  • the guide device has a roller 22 running on the cam control device 21.
  • the guide device 16 consists of a frame 23, the upper part of which has the rollers 15 and 22 mentioned and the lower part of which extends essentially parallel to the carrier 6, in which direction of extension the conveying direction of the bag to be closed by the device 1 also lies, which is indicated by arrow 24.
  • the direction of movement of the goods 17 and 18 is predetermined by two horizontal pairs of rails 25, 26 on the lower part of the guide device 16. These pairs of rails are fastened at the ends to holding plates 27, which also each have a pressure medium cylinder 28, 29 for the counter-clockwise reciprocating movement of the one shown in FIG. 1, very schematically Carriage 17, 18 shown.
  • the starting position of the carriages carrying the folding finger groups 19, 20 essentially corresponds to the position shown in FIG. 1, so that the carriages move apart in order to achieve their working position in which the folding finger groups rest against the narrow sides of the bag (FIG. 5).
  • Each carriage 17, 18 consists of six horizontal guide rails 30 which are fastened at their ends to holding plates 31, 32, the plates 32 on their other side each having two axle bodies 33 (FIG. 4) and each axle body with one in the pairs of rails 25 , 26 running wheel pair 34 is provided.
  • Each carriage 17, 18 is provided with two support units of 35 and 36, respectively, which run on rollers 37 on the guide rails 30 and are each driven in the opposite direction by pressure medium cylinders 38 and 39, which act on the units 35, 36 and on the other hand, are fastened to the holding plates 31, 32.
  • the downwardly extending folding finger groups 19 and 20 are arranged on the carrying units 35, 36. As best shown in FIG. 3, each unit 35 is rigidly connected to a lateral sword-like folding finger 19a, while a third sword-like folding finger 19b is provided in the middle between the two lateral fingers 19a, but protrudes relative to them according to FIG. 2 (folding position).
  • the sword-like folding fingers 20a, 20b of the other carriage 18 are arranged accordingly.
  • the third folding fingers 19b and 20b are not attached to the units 35 and 36, but are approximately in the Longitudinal center of the carriages 17 and 18, for example, pivotably articulated on the respective lower front rail 30.
  • Each folding finger 19b, 20b has a short lever arm 40 near its pivot axis, the piston rods 41 being articulated on each lever arm by pressure medium cylinders 42 (FIG. 2).
  • the cylinders 42 are located above the carriages 17, 18 and are pivotally mounted on arms 43, the latter also being fastened to one of the rails 30.
  • the folding fingers In addition to folding the sack opening of a filled sack made of paper or plastic (film), the folding fingers have the effect that the Sac?:. Ends do not have any corner areas that otherwise point in the direction of the narrow sack sides, which tightly stack filled sacks on pallets not allow and which are particularly susceptible to bag damage, an hourly folding performance of the device of at least 1000 to 1200 bags. This achievement represents an increase of approximately 50% compared to previously known devices.
  • control curve device 21 is designed such that the control curve ends at the outlet 21a is connected to an additional, relatively short control curve section 21b, which consists of an increasing and a decreasing curve section (FIG. 1), for example in the form of an arc, as a result of which the folding finger groups 19, 20 are raised and then lowered briefly.
  • the folded top end 45a of the bag experiences a kink 46 extending across the width of the bag (FIG.
  • the function of the device described below is as follows. It is assumed that the frame 8 (FIG. 1) is located in the right end region of the carrier 6, so that the lifting cylinder 14 holds the guide device 16 in the uppermost position.
  • the folding finger groups 19 and 20 have such a position that the lateral folding fingers 19a and 20a are essentially together, as shown in FIGS. 1 and 3, and that the pivotable, third folding fingers are in their rest position, which are also off Figures 1 and 2 can be seen.
  • a filled, open top bag 45 conveyed by a conveyor 47 then has a free inlet below the guide device 16 the device 1.
  • the frame 8 is moved synchronously by means of the drive 9, 10, the lifting cylinder 14 simultaneously causing the guide device 16 to lower when the control cam device 21 is reached.
  • the lateral folding fingers 19a, 20a each forming a pair of folding fingers, enter the open-top sack and are first moved apart outwards when the cylinder pairs 38 and 39 reach a sufficient depth, thereby spreading the sack opening.
  • These pairs of folding fingers are then moved parallel to the sack plane in the direction of the narrow sides of the sack by the cylinders 28 and 29 of the guide device 16 with relieved cylinder pairs 38, 39 until they come to rest there.
  • the two cylinders 42 are actuated, which now pivot the third folding fingers 19b, 20b downward into the folding position and thereby form a so-called deep fold at the top of the bag between the pairs of folding fingers mentioned, which can be seen from the left-hand illustration in FIG. 5.
  • the folding fingers of the pairs of folding fingers are moved together inwards again.
  • the aforementioned kink 46 is now formed at the top of the bag 45a.
  • the roller 22 is raised by the section 21b, so that the guide device 16 and thus the folding finger groups 19 and 20 also rise. Then the roller 22 lowers again, so that the folding finger groups 19, 10 are also moved downward, the static friction between the folding finger groups and the bag material acts that the upper end of the bag 45a is pressed down, whereby the kink 46 is formed.
  • the sack folded in this way has reached a further conveying device 48 of known type, the inlet end of which has arms 48a which can be moved in the manner of scissors and which now grip the folded sack end 45a approximately in the region of the fold 46, which is done by the pressure medium cylinders 49.
  • the lifting cylinder 14 can move the guide device 16 upwards, as a result of which the folding finger groups 19, 20 are pulled out of the top of the bag, after which the frame 8 and thus the guide device 16 are again moved into the right starting position.
  • the folded sack 45 is further fed to the sewing or welding device 2 for final closing.

Abstract

An apparatus of this type consists of two groups (19, 20), each with three sword-like folding fingers, of which in each case two pairs of folding fingers are movable from above into the bag orifice of a bag conveyed upright, and the third folding finger of each group can be brought into the folding position externally on the associated narrow side of the bag. In order substantially to increase the folding efficiency of the apparatus, the third folding fingers are made pivotable and can be brought out of the folding position into a position of rest, in which they open the way for the further transport of the folded bag and for the feed of the next bag to be folded. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Falten der öffnung von gefüllten Säcken, insbesondere von Säcken mit einer nach innen gerichteten Tieffalte an beiden Schmalseiten, bestehend aus zwei Gruppen mit jeweils drei schwertartigen Faltfingern, von denen jeweils zwei Faltfingerpaare von oben in die öffnung eines stehend angeförderten Sackes bewegbar sind und der dritte Faltfinger jeder Gruppe außen an der zugeordneten Sackschmalseite in Faltposition bringbar ist, wobei zum Aufspreizen der Sach- öffnung die Faltfinger der beiden Faltfingerpaare zunächst quer'und dann parallel zur Sackebene verstellbar sind und wobei anschließend zum Bilden der Tieffalte unter Schließen der Sacköffnung die beiden dritten Faltfinger bei entlastetem Antrieb der beiden Faltfingerpaare in die Faltposition bewegbar sind.The invention relates to a device for folding the opening of filled sacks, in particular sacks with an inward deep fold on both narrow sides, consisting of two groups, each with three sword-like folding fingers, of which two pairs of folding fingers each from above into the opening of a sack that is conveyed upright can be moved and the third folding finger of each group can be brought into the folding position on the outside of the assigned narrow side of the bag, the folding fingers of the two pairs of folding fingers being initially adjustable transversely and then parallel to the plane of the bag and then being closed to form the deep fold while closing the The two third folding fingers can be moved into the folding position when the two folding finger pairs are unloaded.

Bei einer bekannten Vorrichtung dieser Art ist der dritte Faltfinger der beiden Faltfingergruppen zwecks Ausbildung der sogenannten Tieffalte im oberen Bereich der Schmalseiten des gefüllten Sackes linear hin- und herbewegbar, und zwar mittels eines Druckmittelzylinderantriebs. Da die dritten Faltfinger einen relativ langen Weg zwischen ihrer Faltposition und ihrer Ausgangsposition zurücklegen müssen, muß der Druckmittelzylinder schnell arbeiten, wenn eine zufriedenstellende Stundenleistung der Vorrichtung erzielt werden soll. Bisherige Stundenleistungen liegen bei etwa 800 Säcken und entsprechen nicht mehr den heutigen Erwartungen, da z.B. die der Faltvorrichtung nachgeordnete Näh-oder Schweißeinrichtung eine höhere Leistung je Stunde erbringt. Ein wesentlicher Grund für die nicht mehr zufriedenstellende Stundenleistung liegt in der relativ langen Zeit, die die dritten Faltfinger benötigen, um aus ihrer Ausgangsstellung in ihre Faltposition zu gelangen. Ein schnelleres Arbeiten der bekannten, die dritten Faltfinger betätigenden Druckmittelzylinder könnte mit einem höheren Betriebsdruck des Druckfluids erfolgen, was aber nicht gewünscht wird, da der allgemein in einem Werk fibliche Druckwert für das Fluid verwendet werden soll.In a known device of this type, the third folding finger of the two folding finger groups can be moved back and forth linearly in order to form the so-called deep fold in the upper region of the narrow sides of the filled sack. by means of a pressure medium cylinder drive. Since the third folding fingers have to travel a relatively long way between their folding position and their starting position, the pressure medium cylinder must work quickly if a satisfactory hourly performance of the device is to be achieved. The hourly output to date has been around 800 sacks and no longer meets today's expectations, since, for example, the sewing or welding device arranged downstream of the folding device achieves a higher output per hour. A major reason for the hourly performance, which is no longer satisfactory, is the relatively long time it takes for the third folding fingers to get from their starting position to their folding position. The known pressure medium cylinders, which operate the third folding fingers, could work faster with a higher operating pressure of the pressure fluid, but this is not desirable since the pressure value generally used in a factory for the fluid is to be used.

Die Aufgabe der Erfindung besteht in der Verbesserung der einleitend angeführten Vorrichtung dahingehend, daß auf einfache Weise ein schnelleres Arbeiten der dritten Faltfinger als bisher erreicht ist. Die Lösung der Aufgabe geht von der angegebenen Vorrichtung aus und kennzeichnet sich dadurch, daß die dritten Faltfinger schwenkbar ausgebildet und aus der Faltposition in eine Ruheposition bringbar sind, in der sie den Weg für den Weitertransport des gefalteten Sackes und für den Antransport des nächsten zu faltenden Sackes freigeben.The object of the invention is to improve the device mentioned in the introduction in such a way that the third folding fingers can be operated more quickly than before. The solution to the problem is based on the specified device and is characterized in that the third folding fingers are pivotable and can be brought from the folding position into a rest position, in which they are the way for the further transport of the folded bag and for the transport of the next one to be folded Release sacks.

Durch diese Lösung ist ein schnelleres Arbeiten der dritten Faltfinger ermöglicht, denn die Druckmittelzylinder für die Betätigung dieser Faltfinger greifen in Nähe der Faltfingerdrehachse an den Faltfingern an, so daß der übrige, mit dem Faltvorgang befaßte Bereich der Faltfinger mit gesteigerter Geschwindigkeit zwischen der Ausgangsposition und der Faltposition hin- und herbewegt werden kann. Die Stundenleistung der Vorrichtung ist durch diese Lösung auf wenigstens 1000 bis 2000 Säcke erhöht, was eine Erhöhung um maximal etwa 50% bedeutet. Ein weiterer Vorteil besteht darin, daß diese Lösung auf baulich einfache Weise ausgeführt werden kann, denn die fraglichen Druckmittelzylinder können senkrecht stehend angeordnet werden, wodurch die Vorrichtung kompakter gestaltet ist.This solution enables the third folding fingers to work faster, because the pressure medium cylinders for actuating these folding fingers engage the folding fingers in the vicinity of the axis of rotation of the folding fingers, so that the rest of the area of the folding fingers, which is concerned with the folding process can be moved back and forth with increased speed between the starting position and the folding position. The hourly performance of the device is increased by this solution to at least 1000 to 2000 bags, which means an increase of at most about 50%. Another advantage is that this solution can be carried out in a structurally simple manner, because the pressure medium cylinders in question can be arranged vertically, which makes the device more compact.

Die Erfindung wird nachstehend anhand eines in den anliegenden Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

  • Figur 1 das Ausführungsbeispiel in sehr schematischer Seitenansicht,
  • Figur 2 einen Bereich des in Figur 1 gezeigten Ausführungsbeispieles in vergrößerter und teilweise geschnittener Darstellung,
  • Figur 3 eine Ansicht nach der Linie III-III in Figur 2,
  • Figur 4 eine Aufsicht gemäß dem Pfeil A in Figur 3,
  • Figur 5 eine vereinfachte Darstellung zur Erläuterung der Funktion des Ausführungsbeispieles,
  • Figur 6 eine Ansicht auf das Oberende eines gefalteten Sackes, gesehen von der Sackschmalseite her.
The invention is explained below with reference to an embodiment shown in the accompanying drawings. Show it:
  • FIG. 1 shows the exemplary embodiment in a very schematic side view,
  • FIG. 2 shows an area of the exemplary embodiment shown in FIG. 1 in an enlarged and partially sectioned illustration,
  • FIG. 3 shows a view along the line III-III in FIG. 2,
  • FIG. 4 shows a top view according to arrow A in FIG. 3,
  • FIG. 5 shows a simplified illustration to explain the function of the exemplary embodiment,
  • Figure 6 is a view of the top of a folded sack, seen from the narrow side of the sack.

Die vorgeschlagene Vorrichtung ist gemäß figur 1 im allgemeinen, jedoch nicht notwendigerweise, ein Bestandteil einer größeren Maschine, die in der Regel auch eine hier nicht relevante Verschließeinrichtung 2 aufweist, um die zugefalteten Öffnungen der gefüllten Säcke durch Nähen oder Schweißen, je nach dem, ob es sich um Papier- oder Kunststoffsäcke handelt, verschließen zu können. Beide Vorrichtungen werden von einem gemeinsamen Ständer 3 getragen, derart, daß sie höhenverstellbar sind, wie mit dem Doppelpfeil 4 angegeben ist. Hierzu ist der Ständer 3 in bekannter Weise mit einem höhenverstellbaren Block 5 versehen, an dem die Vorrichtungen 1 und 2 befestigt sind. Die Vorrichtung 1 besteht aus einem horizontalen Träger 6, einem darauf über Rollen 7 verfahrbaren Gestell 8, das von einem durch einen Elektromotor 9 angetriebenen Zugmittelbetrieb 10 horizontal bewegt wird, wobei diese Bewegung mittels Endschalter 11 und Dämpfer 12 sowie Anschlägen 13 begrenzt bzw. gebremst wird, einer vom Gestell 8 über einen Hubzylinder 14 getragenen und daran über Rollen 15 geführten Führungseinrichtung 16 und aus zwei von der Führungseinrichtung getragenen, horizontal verfahrbaren Wagen 17 und 18 mit je einer aus drei schwertartigen Faltfingern bestehenden Faltfingergruppe 19 bzw. 20.According to FIG. 1, the proposed device is generally, but not necessarily, a component of a larger machine, which as a rule also has a closing device 2, which is not relevant here, for sewing or welding the folded openings of the filled bags, depending on whether it is paper or plastic sacks to be able to close. Both devices are carried by a common stand 3, such that they are adjustable in height, as with the double arrow 4 is indicated. For this purpose, the stand 3 is provided in a known manner with a height-adjustable block 5 to which the devices 1 and 2 are attached. The device 1 consists of a horizontal support 6, a frame 8 movable thereon via rollers 7, which is moved horizontally by a traction mechanism operation 10 driven by an electric motor 9, this movement being limited or braked by means of limit switches 11 and dampers 12 and stops 13 , a guide device 16 carried by the frame 8 via a lifting cylinder 14 and guided there by rollers 15, and comprising two horizontally movable carriages 17 and 18 carried by the guide device, each with a folding finger group 19 or 20 consisting of three sword-like folding fingers.

Ferner ist eine ortsfeste, mit der Führungseinrichtung 16 zusamrnenwirkendeKurbensteuereinrichtung 21 vorgesehen, um die Vorwärts-Abwärts-Bewegung der Führungseinrichtung und damit der Faltfingergruppen 19, 20 während des Faltvorganges festzulegen. Hierzu weist die Führungseinrichtung eine auf der Kurvensteuereinrichtung 21 ablaufende Rolle 22 auf.Furthermore, a stationary crank control device 21, which interacts with the guide device 16, is provided in order to fix the forward-downward movement of the guide device and thus of the folding finger groups 19, 20 during the folding process. For this purpose, the guide device has a roller 22 running on the cam control device 21.

Die Führungseinrichtung 16 besteht aus einem Rahmen 23, dessen oberer Teil die erwähnten Rollen 15 und 22 aufweist und dessen unterer Teil sich im wesentlichen parallel zu dem Träger 6.erstreckt, in welcher Erstreckungsrichtung auch die Förderrichtung des von der Vorrichtung 1 zu verschließenden Sackes liegt, die durch den Pfeil 24 angegeben ist. Die Bewegungsrichtung der Waren 17 und 18 ist durch zwei horizontale Schienenpaare 25, 26 am unteren Teil der Führungseinrichtung 16 vorgegeben. Diese Schienenpaare sind endseits an Halteplatten 27 befestigt, die auch je einen Druckmittelzylinder 28, 29 für die gegenllufige Hin- und Herbewegung der in Figur 1 sehr schematisch gezeigten Wagen 17, 18 tragen. Die Ausgangsstellung der die Faltfingergruppen 19, 20 tragenden Wagen entspricht im wesentlichen der in Figur 1 gezeigten Stellung, so daß die Wagen zwecks Erreichung ihrer Arbeitsstellung, in welcher die Faltfingergruppen an den Sackschmalseiten anliegen, auseinanderfahren (Figur 5).The guide device 16 consists of a frame 23, the upper part of which has the rollers 15 and 22 mentioned and the lower part of which extends essentially parallel to the carrier 6, in which direction of extension the conveying direction of the bag to be closed by the device 1 also lies, which is indicated by arrow 24. The direction of movement of the goods 17 and 18 is predetermined by two horizontal pairs of rails 25, 26 on the lower part of the guide device 16. These pairs of rails are fastened at the ends to holding plates 27, which also each have a pressure medium cylinder 28, 29 for the counter-clockwise reciprocating movement of the one shown in FIG. 1, very schematically Carriage 17, 18 shown. The starting position of the carriages carrying the folding finger groups 19, 20 essentially corresponds to the position shown in FIG. 1, so that the carriages move apart in order to achieve their working position in which the folding finger groups rest against the narrow sides of the bag (FIG. 5).

Aus den Figuren 2, 3 und 4 ist der grundsätzliche Aufbau der Wagen 17 und 18 mit den Faltfingergruppen 19, 20 sowie deren Funktionen klar zu ersehen.The basic structure of the carriages 17 and 18 with the folding finger groups 19, 20 and their functions can be clearly seen from FIGS. 2, 3 and 4.

Jeder Wagen 17, 18 besteht aus sechs horizontalen Führungsschienen 30, die an ihren Enden an Halteplatten 31, 32 befestigt sind, wobei die Platten 32 auf ihrer anderen Seite je zwei Achskörper 33 (Figur 4) aufweisen und jeder Achskörper mit einem in den Schienenpaaren 25, 26 laufenden Radpaar 34 versehen ist. Jeder Wagen 17, 18 ist mit zwei Trageinheiten von 35 bzw. 36 versehen, die jeweils über Rollen 37 auf den Führungsschienen 30 laufen und je durch Druckmittelzylinder 38 bzw. 39 in gegenläufiger Richtung angetrieben werden, die einerseits an den Einheiten 35, 36 angreifen und andererseits an den Halteplatten 31, 32 befestigt sind.Each carriage 17, 18 consists of six horizontal guide rails 30 which are fastened at their ends to holding plates 31, 32, the plates 32 on their other side each having two axle bodies 33 (FIG. 4) and each axle body with one in the pairs of rails 25 , 26 running wheel pair 34 is provided. Each carriage 17, 18 is provided with two support units of 35 and 36, respectively, which run on rollers 37 on the guide rails 30 and are each driven in the opposite direction by pressure medium cylinders 38 and 39, which act on the units 35, 36 and on the other hand, are fastened to the holding plates 31, 32.

An den Trageinheiten 35, 36 sind die sich nach unten erstreckenden Faltfingergruppen 19 bzw. 20 angeordnet. Wie es am besten Figur 3 zeigt, ist jede Einheit 35 mit einem seitlichen schwertartigen Faltfinger 19a starr verbunden, während ein dritter schwertartiger Faltfinger 19b in der Mitte zwischen beiden seitlichen Fingern 19a vorgesehen ist, jedoch gegenüber diesen gemäß Figur 2 vorsteht (Faltposition). Entsprechend sind die schwertartigen Faltfinger 20a, 20b des anderen Wagens 18 angeordnet. Dabei sind die dritten Faltfinger 19b und 20b nicht an den Einheiten 35 bzw. 36 befestigt, sondern sind etwa in der Längsmitte der Wagen 17 bzw. 18 an z.B. der jeweiligen vorderen unteren Schiene 30 schwenkbar angelenkt. Jeder Faltfinger 19b, 20b weist nahe seiner Schwenkachse einen kurzen Hebelarm 40 auf, wobei an jedem Hebelarm die Kolbenstangen 41 von Druckmittelzylindern 42 angelenkt sind (Figur 2). Die Zylinder 42 befinden sich oberhalb der Wagen 17, 18 und sind schwenkbar an Armen 43 gelagert, welch letztere ebenfalls an einer der Schienen 30 befestigt sind.The downwardly extending folding finger groups 19 and 20 are arranged on the carrying units 35, 36. As best shown in FIG. 3, each unit 35 is rigidly connected to a lateral sword-like folding finger 19a, while a third sword-like folding finger 19b is provided in the middle between the two lateral fingers 19a, but protrudes relative to them according to FIG. 2 (folding position). The sword-like folding fingers 20a, 20b of the other carriage 18 are arranged accordingly. The third folding fingers 19b and 20b are not attached to the units 35 and 36, but are approximately in the Longitudinal center of the carriages 17 and 18, for example, pivotably articulated on the respective lower front rail 30. Each folding finger 19b, 20b has a short lever arm 40 near its pivot axis, the piston rods 41 being articulated on each lever arm by pressure medium cylinders 42 (FIG. 2). The cylinders 42 are located above the carriages 17, 18 and are pivotally mounted on arms 43, the latter also being fastened to one of the rails 30.

Zum besseren Verständnis des Aufbaus der Wagen 17, 18 und der in ihnen laufenden Trageinheiten 35, 36 sind in Figur 4 die Zylinder 38 und 42 fortgelassen. Gezeigt sind jedoch einstellbare Anschläge 44 der Wagen, um die Ausfahrbewegungen der Kolbenstangen der Zylinder 38 und 39 zu begrenzen.For better understanding of the structure of the carriages 17, 18 and the support units 35, 36 running in them, the cylinders 38 and 42 are omitted in FIG. However, adjustable stops 44 of the carriages are shown in order to limit the extension movements of the piston rods of the cylinders 38 and 39.

Aus der vorstehenden Beschreibung ergibt sich daß jeweils die beiden seitlichen Faltfinger 19a bzw. 20a mittels der verfahrbaren Einheiten 35 und 36 auseinander- und wieder zusammengefahren werden können, während die mittleren Faltfinger 19b und 20b lediglich mittels der Zylinder 42 verschwenkt werden, und zwar aus einer strichpunktiert angedeuteten Ruhestellung (Figur 2) die einen Weitertransport eines oben zugefalteten Sackes 45 gestattet in eine Faltstellung (Figur 2).From the above description it follows that the two lateral folding fingers 19a and 20a can be moved apart and moved together again by means of the movable units 35 and 36, while the middle folding fingers 19b and 20b can only be pivoted by means of the cylinder 42, specifically from one dot-dashed rest position (Figure 2) which allows a further transport of a folded-up sack 45 in a folded position (Figure 2).

. Die Faltfinger bewirken neben dem Zufalten der Sacköffnung eines gefüllt angeförderten Sackes aus Papier- oder Kunststoff (Folie) in der Weise, daß die Sac?:.erenden keine sonst in Richtung der Sackschmalseiten weisenden Eckbereiche aufweisen, die ein enges Stapeln von gefüllten Säcken auf Paletten nicht erlauben und die besonders anfällig für Sackbeschädigungen sind, eine stündliche Faltleistung der Vorrichtung von wenigstens 1000 bis 1200 Säcken. Diese Leistung stellt eine Steigerung von etwa 50% gegenüber bisher bekannten Vorrichtungen dar.. In addition to folding the sack opening of a filled sack made of paper or plastic (film), the folding fingers have the effect that the Sac?:. Ends do not have any corner areas that otherwise point in the direction of the narrow sack sides, which tightly stack filled sacks on pallets not allow and which are particularly susceptible to bag damage, an hourly folding performance of the device of at least 1000 to 1200 bags. This achievement represents an increase of approximately 50% compared to previously known devices.

Um bei dieser Leistung der Vorrichtung zu erreichen, daß beim Faltvorgang noch mehr Luft aus dem Sackoberende 45a entweichen kann, was zu einem verbesserten Stapeln von gefüllten und verschlossenen Säcken auf Paletten führt, ist die Steuerkurveneinrichtung 21 so ausgestaltet, daß sich an den Auslauf der Steuerkurve 21a ein zusätzlicher, relativ kurzer Steuerkurvenabschnitt 21b anschließt, der aus einer ansteigenden und aus einer abfallenden Kurvenstrecke (Figur 1) besteht, z.B. in Form eines Bogens, wodurch eine kurze Hebung und anschließende kurze Absenkung der Faltfingergruppen 19, 20 erfolgt. Dies hat zur Folge, daß das zugefaltete Sackoberende 45a über die Sackbreite verlaufend eine Einknickung 46 erfährt (Figur 6) mit der Wirkung, daß dadurch noch mehr Luft aus dem Sackoberende herausgedrückt wird, weil sich die Faltfinger zunächst etwas aus dem gefalteten Sackoberende herausbewegen und dann bei ihrer Absenkung das Sackoberende nach unten bewegen, wobei die Einknickung 46 erfolgt, da der übrige Sack nicht abgesenkt wird.In order to achieve with this performance of the device that even more air can escape from the top of the bag 45a during the folding process, which leads to an improved stacking of filled and closed bags on pallets, the control curve device 21 is designed such that the control curve ends at the outlet 21a is connected to an additional, relatively short control curve section 21b, which consists of an increasing and a decreasing curve section (FIG. 1), for example in the form of an arc, as a result of which the folding finger groups 19, 20 are raised and then lowered briefly. The result of this is that the folded top end 45a of the bag experiences a kink 46 extending across the width of the bag (FIG. 6) with the effect that even more air is forced out of the top end of the bag because the folding fingers first move somewhat out of the folded top end and then when lowering, move the top of the bag downward, causing the buckling 46 because the rest of the bag is not lowered.

Die Funktion der nachstehend beschriebenen Vorrichtung ist folgende. Es sei angenommen, daß sich das Gestell 8 (Figur 1) im rechten Endbereich des Trägers 6 befindet, so daß der Hubzylinder 14 die Führungseinrichtung 16 in der obersten Stellung hält. Die Faltfingergruppen 19 und 20 weisen dabei eine solche Stellung auf, daß sich die seitlichen Faltfinger 19a bzw. 20a im wesentlichen beieinander befinden, wie es die Figuren 1 und 3 zeigen und daß sich die schwenkbaren, dritten Faltfinger in ihrer Ruheposition befinden, die ebenfalls aus den Figuren 1 und 2 ersichtlich ist. Ein von einem Förderer 47 stehend angeförderter, gefüllter, oben offener Sack 45 hat dann unterhalb der Führungseinrichtung 16 freien Einlauf in die Vorrichtung 1.The function of the device described below is as follows. It is assumed that the frame 8 (FIG. 1) is located in the right end region of the carrier 6, so that the lifting cylinder 14 holds the guide device 16 in the uppermost position. The folding finger groups 19 and 20 have such a position that the lateral folding fingers 19a and 20a are essentially together, as shown in FIGS. 1 and 3, and that the pivotable, third folding fingers are in their rest position, which are also off Figures 1 and 2 can be seen. A filled, open top bag 45 conveyed by a conveyor 47 then has a free inlet below the guide device 16 the device 1.

Sobald der zu faltende Sack 45 sich unterhalb der Faltfingergruppen 19, 20 befindet, wird das Gestell 8 mittels des Antriebes 9, 10 synchron mitverfahren, wobei der Hubzylinder 14 bei Erreichen der Steuerkurveneinrichtung 21 ein gleichzeitiges Absenken der Führungseinrichtung-16 bewirkt. Dabei gelangen die seitlichen, jeweils ein Faltfingerpaar bildenden Faltfinger 19a, 20a in den oben offenen Sack und werden bei Erreichen einer genügenden Tiefe durch die Zylinderpaare 38 bzw. 39 zunächst nach außen auseinandergefahren, wodurch die Sacköffnung aufgespreizt wird. Anschließend werden diese Faltfingerpaare durch die Zylinder 28 und 29 der Führungseinrichtung 16 bei entlasteten Zylinderpaaren 38, 39 parallel zur Sackebene in Richtung der Sackschmalseiten verfahren, bis sie dort zur Anlage kommen. Sodann werden die beiden Zylinder 42 betätigt, die nun die dritten Faltfinger 19b, 20b nach unten in die Faltposition verschwenken und dadurch zwischen den erwähnten Faltfingerpaaren eine sogenannte Tieffalte am Sackoberende ausbilden, was aus der linken Darstellung in Figur 5 zu erkennen ist. Durch das Ausbilden der Tieffalte werden die Faltfinger der Faltfingerpaare wieder nach innen zusammengefahren.As soon as the sack 45 to be folded is located below the folding finger groups 19, 20, the frame 8 is moved synchronously by means of the drive 9, 10, the lifting cylinder 14 simultaneously causing the guide device 16 to lower when the control cam device 21 is reached. The lateral folding fingers 19a, 20a, each forming a pair of folding fingers, enter the open-top sack and are first moved apart outwards when the cylinder pairs 38 and 39 reach a sufficient depth, thereby spreading the sack opening. These pairs of folding fingers are then moved parallel to the sack plane in the direction of the narrow sides of the sack by the cylinders 28 and 29 of the guide device 16 with relieved cylinder pairs 38, 39 until they come to rest there. Then the two cylinders 42 are actuated, which now pivot the third folding fingers 19b, 20b downward into the folding position and thereby form a so-called deep fold at the top of the bag between the pairs of folding fingers mentioned, which can be seen from the left-hand illustration in FIG. 5. By forming the deep folds, the folding fingers of the pairs of folding fingers are moved together inwards again.

Da die Nachlaufrolle 22 der Führungseinrichtung 16 nunmehr am Abschnitt 21b der Steuerkurveneinrichtung 21 angekommen ist, erfolgt nun die Ausbildung der erwähnten Einknickung 46 am Sackoberende 45a. Hierzu wird die Rolle 22 durch den Abschnitt 21b angehoben, so daß sich auch die Führungseinrichtung 16 und damit die Faltfingergruppen 19 und 20 anheben. Anschließend senkt sich die Rolle 22 wieder ab, so daß die Faltfingergruppen 19, 10 ebenfalls abwärts bewegt werden, wobei die Haftreibung zwischen den Faltfingergruppen und dem Sackmaterial bewirkt, daß das Sackoberende 45a nach unten gedrückt wird, wobei die Einknickung 46 entsteht. Dieses Einknicken wiederum hat zur Folge, daß noch weitere Luft, die sich nach dem Zufalten des Sackoberendes noch oberhalb der Sachfüllung befunden hat, nach oben aus der Sacköffnung herausgedrückt wird, so daß so wenig wie möglich an Restluft im zugefalteten Sackoberende verbleibt. Nach Abschluß dieser Vorgänge weist das Sackoberende etwa die in Figur 6 gezeigte Gestalt auf.Since the trailing roller 22 of the guide device 16 has now arrived at the section 21b of the control cam device 21, the aforementioned kink 46 is now formed at the top of the bag 45a. For this purpose, the roller 22 is raised by the section 21b, so that the guide device 16 and thus the folding finger groups 19 and 20 also rise. Then the roller 22 lowers again, so that the folding finger groups 19, 10 are also moved downward, the static friction between the folding finger groups and the bag material acts that the upper end of the bag 45a is pressed down, whereby the kink 46 is formed. This buckling in turn has the result that even more air, which was still above the material filling after the top of the sack was folded, is pushed up out of the sack opening, so that as little residual air as possible remains in the folded top of the sack. After these processes have been completed, the top of the bag has approximately the shape shown in FIG.

Inzwischen ist der so zugefaltete Sack zu einer Weiterfördereinrichtung 48 bekannter Art gelangt, deren Einlaufende scherenartig bewegbare Arme 48a aufweist, die nun das zugefaltete Sackoberende 45a etwa im Bereich der Einknickung 46 durch Zusammenklappen erfassen, was durch die Druckmittelzylinder 49 erfolgt. Nun kann der Hubzylinder 14 die Führungseinrichtung 16 nach oben verfahren, wodurch die Faltfingergruppen 19, 20 aus dem Sackoberende herausgezogen werden, wonach das Gestell 8 und damit die Führungseinrichtung 16 wieder in die rechte Ausgangsstellung verfahren wird. Der zugefaltete Sack 45 wird weiter der Näh- oder Schweißvorrichtung 2 zum endgültigen Verschließen zugeführt.In the meantime, the sack folded in this way has reached a further conveying device 48 of known type, the inlet end of which has arms 48a which can be moved in the manner of scissors and which now grip the folded sack end 45a approximately in the region of the fold 46, which is done by the pressure medium cylinders 49. Now the lifting cylinder 14 can move the guide device 16 upwards, as a result of which the folding finger groups 19, 20 are pulled out of the top of the bag, after which the frame 8 and thus the guide device 16 are again moved into the right starting position. The folded sack 45 is further fed to the sewing or welding device 2 for final closing.

Wenn nicht ein sogenannter Tieffaltensack, sondern ein Sack mit einer Einfachfalte (rechte Darstellung in Figur 5) zugefaltet werden soll, geschieht dies im wesentlichen in der gleichen beschriebenen Weise mit der Ausnahme, daß sämtliche Faltfinger jeder Faltfingergruppe 19 und 20 zusammengefahren bleiben (Figuren 2 und 3), so daß alle Finger jeder Gruppe als ein gemeinsamer Finger anzusehen sind, der in die offene Sacköffnung eintaucht. In Verbindung mit Figur 5 ist es dann ohne weiteres klar, wie das Zufalten eines Sackes mit Einfachfalte erfolgt.If not a so-called deep-fold sack, but a sack with a single fold (right illustration in FIG. 5) is to be folded in, this is done essentially in the same manner as described, with the exception that all the folding fingers of each folding finger group 19 and 20 remain moved together (FIGS. 2 and 3), so that all fingers of each group are to be regarded as a common finger that dips into the open pocket opening. In connection with FIG. 5, it is then immediately clear how a single-fold sack is folded.

Claims (5)

1. Vorrichtung zum Falten der öffnung von geöffneten Säkken, insbesondere von Säcken mit einer nach innen gerichteten Tieffalte an beiden Schmalseiten, bestehend aus zwei Gruppen mit jeweils drei schwertartigen Faltfingern, von denen jeweils zwei Faltfingerpaare von oben in die öffnung des stehend angeförderten Sackes bewegbar sind und der dritte Faltfinger jeder Gruppe außen an der zugeordneten Sackschmalseite in Faltposition bringbar ist, wobei zum Aufspreizen der Sacköffnung die Faltfinger der beiden Faltfingerpaare zunächst quer und dann parallel zur Sackebene verstellbar sind und wobei anschließend zum Bilden der Tieffalte unter Schließen der Sacköffnung die beiden dritten Faltfinger bei entlastetem Antrieb der beiden Faltfingerpaare in die Faltposition bewegbar sind, dadurch gekennzeichnet, daß die dritten Faltfinger (19b, 20b) schwenkbar ausgebildet und aus der Faltposition (Figur 2, ausgezogen) in eine Ruheposition (Figur 2, strichpunktiert) bringbar sind, in der sie den Weg für den Weitertransport des gefalteten Sackes und für den Antransport des nächsten zu faltenden Sackes freigeben.1.Device for folding the opening of open sacks, in particular sacks with an inward deep fold on both narrow sides, consisting of two groups with three sword-like folding fingers each, of which two pairs of folding fingers can be moved from above into the opening of the sack, which is conveyed upright and the third folding finger of each group can be brought into the folding position on the outside on the assigned narrow side of the bag, the folding fingers of the two pairs of folding fingers being initially adjustable transversely and then parallel to the plane of the bag, and then the two third folding fingers for forming the deep fold while closing the bag opening when the drive of the two pairs of folding fingers is relieved, they can be moved into the folding position, characterized in that the third folding fingers (19b, 20b) are designed to be pivotable and can be brought from the folding position (FIG. 2, extended) to a rest position (FIG. 2, dash-dotted) in which the way for r Enable the further transport of the folded sack and the transport of the next sack to be folded. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die dritten Faltfinger (19b, 20b) mit einem kurzen Hebelarm (40) versehen sind, dessen eines Ende etwa in Nähe der Schwenkachse der dritten Faltfinger an letzteren befestigt ist und dessen anderes Ende an der Kolbenstange (41) eines Druckmittelzylinders (42) angelenkt ist.2. Device according to claim 1, characterized in that the third folding fingers (19b, 20b) are provided with a short lever arm (40), one end of which is attached to the latter approximately in the vicinity of the pivot axis of the third folding finger and the other end of which Piston rod (41) of a pressure medium cylinder (42) is articulated. 3. Vorrichtung nach Anspruch 1 zum Falten von Säcken mit einer Einfachfalte, dadurch gekennzeichnet, daß die beiden Faltfingergruppen (19, 20) mit allen drei Faltfingern zusammen von oben in die Sacköffnung bewegbar und in der Sackebene parallel zueinander auf größeren Abstand bringbar sind, um mittig gegen die Innenseite der Sackschmalseiten bewegt zu werden und diese unter Bildung der Einfachfalte nach außen zu drücken.3. Device according to claim 1 for folding sacks with a single fold, characterized in that the two folding finger groups (19, 20) with all three folding fingers can be moved together from above into the sack opening and can be brought parallel to one another at a greater distance in the sack plane to be moved centrally against the inside of the narrow sides of the bag and to press them outwards to form the single fold. 4. Vorrichtung nach einem der Ansprüche 1, 2 oder 3, bei der die Bewegungseinrichtungen der Faltfinger hinsichtlich der linearen Verstellbewegungen auf Schienen geführt sind, dadurch gekennzeichnet, daß die Bewegungseinrichtungen (17, 18; 35) mit Rollen (34; 37) auf den betreffenden Schienen (25, 26; 30) laufen.4. Device according to one of claims 1, 2 or 3, in which the movement devices of the folding fingers are guided with respect to the linear adjustment movements on rails, characterized in that the movement devices (17, 18; 35) with rollers (34; 37) on the relevant rails (25, 26; 30) run. 5. Vorrichtung nach Anspruch 1, 2, 3 oder 4, bei der eine Steuerkurve für die gemeinsame Vorwärts-Abwärts-Bewegung der Faltfingergruppen während des Faltens einer Sacköffnung vorgesehen ist, dadurch gekennzeichnet, daß sich an den Auslauf der Steuerkurve (21a) ein zusätzlicher, im wesentlichen kurzer Steuerkurvenabschnitt (21b) anschließt, der zur Hebung und nachfolgenden Absenkung der in Faltstellung befindlichen Faltfingergruppen (19, 20) aus einer ansteigenden und einer abfallenden Kurvenstrecke besteht.5. The device according to claim 1, 2, 3 or 4, wherein a control curve for the common forward-downward movement of the folding finger groups is provided during the folding of a bag opening, characterized in that an additional to the outlet of the control curve (21 a) , essentially a short control curve section (21b), which consists of a rising and a falling curve section for lifting and subsequent lowering of the folding finger groups (19, 20) in the folding position.
EP85113950A 1984-11-24 1985-11-02 Device for folding the openings of filled bags Withdrawn EP0183085A1 (en)

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DE19843442943 DE3442943A1 (en) 1984-11-24 1984-11-24 DEVICE FOR FOLDING THE OPENING OF FILLED BAGS
DE3442943 1984-11-24

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Publication number Priority date Publication date Assignee Title
CN105947258B (en) * 2016-06-29 2018-04-20 芜湖恒耐特传动设备有限公司 A kind of cement package bags flange folds automatic processing device
CN106043825B (en) * 2016-06-29 2018-08-03 芜湖恒耐特传动设备有限公司 Packaging bag automatic flanging folding device
CN105947322B (en) * 2016-06-29 2018-04-20 芜湖恒耐特传动设备有限公司 A kind of cement package bags flange folding device
CN105947259B (en) * 2016-06-29 2018-08-03 芜湖恒耐特传动设备有限公司 Cement package bags flange folds automatic processing device
CN105905364B (en) * 2016-06-29 2018-04-20 芜湖恒耐特传动设备有限公司 A kind of cement package bags automatic flanging folding device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952959A (en) * 1957-05-20 1960-09-20 Continental Can Co Container filling and closing machine
DE1174245B (en) * 1961-04-21 1964-07-16 Jagenberg Werke Ag Device for the M-shaped folding in of two opposite wall parts when closing packs made of paper or the like.
US4070853A (en) * 1977-01-10 1978-01-31 Thermoguard Insulation Company Open top plastic bag sealer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952959A (en) * 1957-05-20 1960-09-20 Continental Can Co Container filling and closing machine
DE1174245B (en) * 1961-04-21 1964-07-16 Jagenberg Werke Ag Device for the M-shaped folding in of two opposite wall parts when closing packs made of paper or the like.
US4070853A (en) * 1977-01-10 1978-01-31 Thermoguard Insulation Company Open top plastic bag sealer

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