EP1818261B1 - Vorrichtung zum Überziehen von Produktgruppen mit Schlauch-Stretchfolie - Google Patents

Vorrichtung zum Überziehen von Produktgruppen mit Schlauch-Stretchfolie Download PDF

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Publication number
EP1818261B1
EP1818261B1 EP07101899A EP07101899A EP1818261B1 EP 1818261 B1 EP1818261 B1 EP 1818261B1 EP 07101899 A EP07101899 A EP 07101899A EP 07101899 A EP07101899 A EP 07101899A EP 1818261 B1 EP1818261 B1 EP 1818261B1
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EP
European Patent Office
Prior art keywords
film
belt
section
roller
arm
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.)
Not-in-force
Application number
EP07101899A
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English (en)
French (fr)
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EP1818261A1 (de
Inventor
Mauro Cere'
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Aetna Group SpA
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Aetna Group SpA
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Publication of EP1818261A1 publication Critical patent/EP1818261A1/de
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Classifications

    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/13—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state
    • B65B9/135—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state for palletised loads

Definitions

  • This invention relates to apparatus for covering groups of products with tubular stretch film.
  • hood stretch machines which cover the products with a “hood”, that is to say, a tubular length of film, preferably, but not necessarily, closed at the top end to form a sleeve-like covering that is stretched over the stacked products and allowed to return to its original size, thanks to the elastic properties of the film, in such a way as to tightly hold the products together.
  • This type of covering is used, for example, to protect stacked products comprising sacks of loose building material or foods, or to wrap domestic appliances, and is applied by machinery typically consisting of:
  • the stretching unit is also equipped with drive means that move the unit down along the frame in such a way as to draw the film over the products, allowing it to gradually release the concertina folds until the film reaches the base of the products at the pallet.
  • the film is released completely so that it covers all the products and, if necessary, also the pallet.
  • the stretching unit usually consists of four substantially L-shaped arms positioned diagonally on the frame in such a way as to enable the related vertical portion to keep the corner of the film mouth open.
  • each arm may comprise:
  • the concertina folding means are applied directly to each arm (see patents US 3,902,303 and FR 2.234.509 ).
  • This unit normally consists of a power-driven wheel or similar revolving component which, when the film reaches the vertical portion of the arm, is brought into contact with the film and gathers the latter up in concertina fashion. After making the concertina folds, the wheel may be moved away from the film or it may continue to be used to guide the film downwardly along the sides of the product group.
  • the frame mounts power-driven rollers for concertina folding the film by pushing it against the second arms or into contact with an idle roller connected to the second arms.
  • the Applicant has designed and constructed an apparatus for covering groups of products with tubular stretch film equipped with an extremely functional concertina folding unit capable of overcoming the above mentioned drawback while maintaining a high level of operating flexibility and without encumbering the constructional architecture of the apparatus.
  • This invention accordingly provides an apparatus for covering groups of products with tubular stretch film, in particular, an apparatus for covering groups of products with tubular stretch film comprising the technical characteristics defined in one or more of the annexed claims.
  • product group 1 will be used, without thereby limiting the scope of the inventive concept, to denote any entity consisting of a single product or two or more stacked products to be wrapped and sealed by the tubular stretch film 2.
  • the apparatus is used for palletized product groups 1 of known type and only partly illustrated in schematic form in Figure 3 .
  • the apparatus 3 is of the type essentially comprising the following elements of particular relevance to this specification: a frame 4, a roll 5 of stretch film 2, means 8 for gripping and opening the film 2, a unit 9 for stretching the film 2 and means 13 for concertina folding or gathering up the film 2 on the stretching unit 9.
  • the frame 4 is usually of the portal type enabling the product group 1 to be positioned inside it.
  • the roll 5 of stretch film 2 is mounted outside the frame 4, is provided with film 2 having a tubular cross section with pleated sides (the pleating is not illustrated in the drawings since it is of well known type) to form an initially flattened configuration, and is controlled by film 2 feed means 6 located at the top of the frame 4 itself.
  • the gripping and opening means 8 are located inside the frame 4 and usually comprise four clamping gripper units 8a (shown in particular in Figures 1 and 3 ) acting on the mouth of the film 2 to at least give the mouth a quadrangular cross section.
  • the above mentioned unit 9 for stretching the film 2 receives the latter from the gripping means 8 in the spread open configuration and then stretches it to a size larger than the perimeter of the product group 1 (see Figure 2 ).
  • the unit 9 comprises a plurality of arms 10 - usually four, arranged in twos, one at each corner formed by two longitudinal walls of the product group 1.
  • Each arm 10 comprises a first vertical section 10a for receiving the film 2 on its surface 10b, and a second section 10c by which the arm 10 itself is linked to the frame 4.
  • Each arm 10 further comprises horizontal translational drive means 11 and vertical drive means 12 for respectively stretching the film 2 and moving the arms 10 down along the frame 4 in such a way as to cover the product group 1 (see arrows F11 and F12 in Figure 3 ).
  • the above mentioned means 13 for folding the film 2 in concertina fashion gather up a quantity of film 2 sufficient to cover the product group 1 (see Figures 2 , 3 and 4 ); the means 13 are mounted on each arm 10 and act on the film 2 before it is stretched.
  • the concertina folding means 13 comprise a power-driven concertina folding belt 14 and an idle roller 16.
  • the power-driven belt 14 for folding the film 2 in concertina fashion is associated with each arm 10 and positioned in the area at the back of the above mentioned film 2 contact surface 10b of the vertical arm section 10a.
  • At least one section 14a of the belt 14 is located at a partial opening 15 in the surface 10b to form a part thereof and in such a way as to engage and feed the film 2 towards the bottom of the contact surface 10b (as indicated by the arrow F14) in combination with the idle roller 16.
  • the above mentioned idle roller 16 is positioned to face the contact surface 10b of each arm 10 and is moved by respective drive means 17 between a retracted, idle position, where the roller 16 is away from the section 14a of the belt 14 (as shown by the dashed line in Figure 5 ), and an advanced, working position, where the roller 16 is in contact with the film 2 interposed between the roller 16 itself and the section 14a of the belt 14 (see Figure 4 and continuous line in Figure 5 ).
  • Figure 4 also shows that the belt 14 is of the endless type and is looped around two wheels 18 and 19, of which at least one, the one labelled 19, is power driven in order to drive the belt in direction F19.
  • the part of the belt 14 portion constituting the section 14a for engaging and feeding the film 2 has a predetermined active working height H such that the film 2 is moved towards the contact surface 10b even under the area where it is interposed between the belt and the idle roller 16: in practice, the film 2, which is "flung" from the point of contact between the belt 14 and the roller 16, and as it proceeds, remains in contact with the belt 14, at least partially and then comes into contact with the surface 10b of the vertical section 10 where it is gathered up uniformly.
  • At least the active portion of the belt 14 that feeds the film 2 extends, preferably but without restricting the scope of the invention, at an angle to the contact surface 10b.
  • the entire belt 14 can be inclined to the contact surface 10b at a divergent angle ⁇ , extending from the top end to the bottom end, so that the film 2 feed section 14a of the belt 14 can project partially from the opening 15.
  • the belt 14 section 14a and the roller 16 are in tangential contact with each other, that is to say, they touch at a single point.
  • each arm 10 may have an arc-shaped cross section defined by three parts 20, 21, 22 joined to each other without interruption.
  • the belt 14 is positioned behind the central part 21 where the partial opening 15 is made.
  • the belt 14 may be powered by a drive unit 23 mounted on the arm 10 and kinematically linked through a respective shaft 24 to the bottom wheel 19 of the belt 14.
  • each idle roller 16 is rotatably linked to one end of a horizontal rod 25 pivoted at the opposite end to a pin 26 that rotates about a vertical axis Z linked to each joining section 10c of the arm 10.
  • Each rod 25 is acted upon by an actuator 27 (constituting the above mentioned drive means 17), located on the joining section 10c and designed to impart to the rod 25 a rotational movement in a horizontal plane between the retracted, idle position and the advanced, working position of the roller 16.
  • An apparatus structured in this way therefore, achieves the above mentioned aims thanks to the presence of the belt behind the surface for gathering up the film on each arm.
  • the belt Thanks to its position and cooperation with the idle roller at the front, the belt starts gathering up or concertina folding the film on its moving surface at a predetermined rate and then releases it on the unmoving surface of the arm, allowing the concertina folding action to be completed by the force of the remaining film pushing down as the belt feeds it.
  • This structure permits better distribution of the concertina folds along the stretching arm, making them more compact and uniform so that the film can subsequently be drawn over the group of products and released in a precisely balanced way.
  • the belt does not touch the film because while the film is being drawn over the walls of the product group, the tension created by stretching the film tends to keep the film path clear of the projecting part of the belt, while the roller is in the retracted position.
  • the size and position of the belt do not alter the overall dimensions and configurations of the arms during their different operating movements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Wrappers (AREA)
  • Making Paper Articles (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Basic Packing Technique (AREA)

Claims (11)

  1. Vorrichtung zum Überziehen von einer aus einem oder mehreren Produkten gebildeten Produktgruppe (1) mit schlauchförmiger Stretchfolie (2), wobei die Vorrichtung (3) der Art ist, die zumindest Folgendes beinhaltet:
    - eine Rolle (5) schlauchförmiger Stretchfolie (2) mit gefalteten Seiten, die durch Mittel (6) für den Vorschub der Folie (2) angesteuert wird, welche am oberen Ende eines Rahmens (4) angeordnet sind;
    - Mittel (8) zum Greifen und Öffnen der Mündung der Folie (2), um dem Mündungsquerschnitt zumindest eine polygonale Form zu geben; wobei de Greifermittel mehrere Greifelemente für jede Folienecke beinhalten;
    - eine Einheit (9) zum Dehnen der Folie (2), welche die Folie (2) von den Greifermitteln (8) in der aufgeweiteten Konfiguration übernimmt und auf eine Größe dehnt, die größer ist als der Umfang der Produktgruppe (1); wobei die Einheit (9) mehrere Arme (10) beinhaltet, die jeweils aus einem ersten vertikalen Abschnitt (10a) zur Aufnahme der Folie (2) auf dessen Oberfläche (10b) bestehen, und aus einem zweiten Abschnitt (10c) zur gelenkigen Verbindung der Arme (10) mit dem Rahmen (4); wobei auf jeden Arm (10) Antriebsmittel (11) für die horizontale Translationsbewegung und vertikale Antriebsmittel (12) wirken, die jeweils die Folie (2) dehnen beziehungsweise sie nach unten entlang des Rahmens (4) bewegen, um die Produktgruppe (1) zu überziehen;
    - Mittel (13) zum "Plissieren" oder ziehharmonikaähnlichen Falten der Folie (2), um eine solche Menge an Folie (2) anzusammeln, die zumindest für das Überziehen der Produktgruppe (1) entlang ihrer Umfangsseiten ausreicht, wobei diese Mittel (13) auf jedem Arm (10) montiert sind und auf die Folie (2) wirken, bevor diese gedehnt wird, und wobei die Vorrichtung (3) dadurch gekennzeichnet ist, dass die Plissiermittel (13) zumindest Folgendes beinhalten:
    - einen kraftbetriebenen Riemen (14) zum Plissieren der Folie (2), der mit jedem Arm (10) verbunden und in dem Bereich auf der Rückseite der Kontaktoberfläche (10b) der Folie (2) des vertikalen Abschnittes (10a) angeordnet ist; wobei zumindest ein Abschnitt (14a) des Riemens (14) an einer teilweisen Öffnung (15) in der Oberfläche (10b) vorgesehen ist, um einen Teil davon zu bilden und auf diese Weise die Folie (2) mitzunehmen und zum unteren Teil der Kontaktoberfläche (10b) hin vorzuschieben, in Kombination mit
    - einer Leerlaufrolle (16), die der Kontaktoberfläche (10b) zugewandt angeordnet ist, mit jedem Arm (10) verbunden ist und durch entsprechende Mittel (17) bewegt wird zwischen einer zurückgezogenen Leerlaufstellung, in der die Rolle (16) von dem Abschnitt (14a) des Riemens (14) abgehoben ist, und einer vorderen Arbeitsstellung, in der die Rolle (16) die Folie (2) berührt, die sich zwischen der Rolle (16) selbst und dem Abschnitt (14a) des Riemens (14) befindet.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Riemen (14) als Endlosriemen ausgeführt und um zwei Räder (18, 19) gelegt ist, von denen zumindest das Rad (19) kraftbetrieben ist.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Riemen (14) als Endlosreimen ausgeführt und um zwei Räder (18, 19) gelegt ist, von denen zumindest das Rad (19) kraftbetrieben ist; wobei ein Teil des Riemenzweiges (14), der sich auf der Oberseite des Riemens (14) erstreckt, den Abschnitt (14a) für das Mitnehmen und Vorschieben der Folie (2) bildet.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der Teil des Riemenzweiges (14), der den Abschnitt (14a) für das Mitnehmen und Vorschieben der Folie (2) bildet, eine vorbestimmte aktive Arbeitshöhe (H) aufweist, so dass die Folie (2) auch unterhalb des Bereiches, in dem sie sich zwischen dem Riemen und der Rolle (16) befindet, zur Kontaktoberfläche (10b) hin bewegt wird.
  5. Vorrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, dass zumindest der aktive Zweig des Riemens (14), der die Folie (2) vorschiebt, in einem bestimmten Winkel zu der Kontaktoberfläche (10b) verläuft.
  6. Vorrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, dass der Riemen (14) relativ zu der Kontaktoberfläche (10b) in einem divergierenden Winkel (α) geneigt ist, der sich von dem oberen Ende zum unteren Ende erstreckt, so dass der Abschnitt (14a) des Riemens (14) für den Vorschub der Folie (2) teilweise über die Öffnung (15) hervorragt.
  7. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass in der vorderen Arbeitsstellung der Rolle (16) der Abschnitt (14a) des Riemens (14) und die Rolle (16) in tangentialer Berührung miteinander sind, das heißt, dass sie sich an einem einzigen Punkt berühren.
  8. Vorrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, dass in der vorderen Arbeitsstellung die Rolle (16) und der Abschnitt (14a) des Riemens (14), der am oberen Rad (18) des Riemens (14) angeordnet ist, in tangentialer Berührung miteinander sind, das heißt, dass sie sich an einem einzigen Punkt berühren.
  9. Vorrichtung nach Anspruch 1, worin der vertikale Abschnitt (10a) jedes Armes (10) einen bogenförmigen Querschnitt aufweist, der durch drei Teile (20, 21, 22) gebildet wird, die unterbrechungsfrei miteinander verbunden sind, wobei die Vorrichtung dadurch gekennzeichnet ist, dass der Riemen (14) hinter dem mittleren Teil (21) angeordnet ist, wo die teilweise Öffnung (15) ausgebildet ist.
  10. Vorrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, dass der Riemen (14) durch eine Antriebseinheit (23) angetrieben wird, die auf dem Arm (10) montiert ist und kinematisch über eine entsprechende Welle (24) mit dem unteren Rad (19) des Riemens (14) verbunden ist.
  11. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass jede Leerlaufrolle (16) drehbar mit einem Ende einer horizontalen Stange (25) verbunden ist, die an ihrem entgegengesetzten Ende drehbar auf einem Zapfen (26) gelagert ist, der sich um eine vertikale Achse (Z) dreht und jeweils mit dem Verbindungsabschnitt (10c) des Armes (10) verbunden ist; wobei jede Stange (25) durch einen Stellantrieb (27) betätigt wird, der auf dem Verbindungsabschnitt (10c) angeordnet ist und dafür ausgelegt ist, die Stange (25) in einer horizontalen Ebene eine Drehbewegung ausführen zu lassen zwischen der zurückgezogenen Leerlaufstellung und der vorderen Arbeitsstellung der Rolle (16).
EP07101899A 2006-02-10 2007-02-07 Vorrichtung zum Überziehen von Produktgruppen mit Schlauch-Stretchfolie Not-in-force EP1818261B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000096A ITBO20060096A1 (it) 2006-02-10 2006-02-10 Apparecchiatura per la copertura di gruppi di prodotti con film tubolare estensibile

Publications (2)

Publication Number Publication Date
EP1818261A1 EP1818261A1 (de) 2007-08-15
EP1818261B1 true EP1818261B1 (de) 2009-06-10

Family

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Application Number Title Priority Date Filing Date
EP07101899A Not-in-force EP1818261B1 (de) 2006-02-10 2007-02-07 Vorrichtung zum Überziehen von Produktgruppen mit Schlauch-Stretchfolie

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EP (1) EP1818261B1 (de)
AT (1) ATE433414T1 (de)
DE (1) DE602007001247D1 (de)
IT (1) ITBO20060096A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES1077857Y (es) * 2012-09-28 2013-01-18 Innova Maqu Cerámica S L (100 0%) Máquina para revestir cargas paletizadas
ITMO20130096A1 (it) * 2013-04-15 2014-10-16 Bocedi S R L Off Macchina per il confezionamento di pallet
DK178374B1 (en) * 2014-11-04 2016-01-18 Frank Bruhn Aps HORIZONTALLY ARRANGED WRAP PACKAGING SYSTEM
CN106314889B (zh) * 2016-10-25 2019-07-12 安徽永锋智能包装科技有限公司 一种用于智能套袋设备的张袋装置
NL2017863B1 (nl) * 2016-11-24 2018-06-01 F3 Design B V Verpakkingmachine voor het aanbrengen van een folie om een te verpakken voorwerp

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063401A (en) * 1974-09-24 1977-12-20 Higgins David M Bagging machine
DE9001321U1 (de) * 1990-02-06 1990-04-12 Develog, Reiner Hannen & Cie, Corgemont, Ch
DE19732298C1 (de) * 1997-07-26 1999-02-04 Moellers Maschf Gmbh Vorrichtung und Verfahren zum Umhüllen eines Stapels
DE50202970D1 (de) * 2001-06-13 2005-06-09 Beumer Maschf Gmbh & Co Kg Verfahren und Vorrichtung zum Umhüllen von Stückguteinheiten mit einer hauben- oder Schlauchförmigen Stretchfolienumhüllung
ITBO20040174A1 (it) * 2004-03-26 2004-06-26 Aetna Group Spa Apparecchiatura per la copertura di gruppi di prodotti con film tubolare estensibile

Also Published As

Publication number Publication date
ITBO20060096A1 (it) 2007-08-11
EP1818261A1 (de) 2007-08-15
ATE433414T1 (de) 2009-06-15
DE602007001247D1 (de) 2009-07-23

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