EP1763471B1 - Device for strapping a palletized load enabling the upper side of said load to be closed, and corresponding strapping method - Google Patents

Device for strapping a palletized load enabling the upper side of said load to be closed, and corresponding strapping method Download PDF

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Publication number
EP1763471B1
EP1763471B1 EP05786235A EP05786235A EP1763471B1 EP 1763471 B1 EP1763471 B1 EP 1763471B1 EP 05786235 A EP05786235 A EP 05786235A EP 05786235 A EP05786235 A EP 05786235A EP 1763471 B1 EP1763471 B1 EP 1763471B1
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EP
European Patent Office
Prior art keywords
load
film
guiding
wrapping
immobilising
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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.)
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EP05786235A
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German (de)
French (fr)
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EP1763471A1 (en
Inventor
Bernard Finzy
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Finzy Sylvie
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Finzy Sylvie
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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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/58—Applying two or more wrappers, e.g. in succession
    • B65B11/585—Applying two or more wrappers, e.g. in succession to stacked articles, e.g. pallettised loads
    • 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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
    • B65B11/025—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders by webs revolving around stationary articles
    • 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
    • B65B2210/00—Specific aspects of the packaging machine
    • B65B2210/14—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles
    • B65B2210/20—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles the web dispenser being mounted on a rotary arm

Definitions

  • the present invention relates to a device for wrapping a palletized load for closing the upper face of said load, and the corresponding wrapping process.
  • “Wrapping” means the total or partial recovery of some sides of a palletized load using film, in particular by helical winding.
  • the wrapping of the upper face of the load can be only quite partial, simply to allow the contacting of at least two strips of film with which the wrapping of the side faces of the pallet was made, and their welding above the palletized load.
  • a machine also called “wrapping machine”
  • wrapping machine which comprises a pivoting or non-pivoting support on which the pallet is placed, a gantry - or the like - comprising at least one vertical arm on which a carriage supporting an unwinder device.
  • film is mobile in vertical translation.
  • the carriage and the load are rotatable relative to one another so that during wrapping, the film is arranged around the load in a rising and / or descending helical movement.
  • the unwinder device being rotatably mounted about a horizontal axis, on the carriage, it is thus possible during the rotation of the pivoting support, to move the carriage over the upper face of the palletized load, and to tilt the film unwinding device so as to apply the latter horizontally on the upper face when the carriage is down.
  • the wrapping machine may comprise several arms each provided with a carriage carrying a film unwinder device.
  • the rate of wrapping is increased. Nevertheless the wrapping machine is then more complex to manufacture and much more expensive.
  • the closing and locking step One of the important steps in the wrapping process is the closing and locking step. From this stage depends the effectiveness of the wrapping. Indeed, the role of the latter is not only to hold the various elements of a pallet, but also to avoid theft of one or more of the elements constituting the pallet.
  • the closing and locking of the pallet are traditionally performed by cutting the strip of film unwound around the pallet, and welding the end of the film connected to the pallet to the film strips already wound around it, on the face side of the pallet.
  • the free end of film must adhere to the load in the initialization phase of the wrapping, but also, in the final phase of wrapping, the end of the film must be attached to the load, cut and reapplied.
  • This operation is carried out at the end of wrapping using welding cutting pliers arranged at the bottom of the platform forming the palletized load support.
  • the European patent application EP 1 332 968 A1 corresponding to the preamble of claim 1, aims to provide an answer by proposing a wrapping device by which the closure and locking of the pallet are performed by the top of the palletized load, that is to say by its upper face .
  • the wrapping device described in this patent application uses a single punch placed in the vertical axis of symmetry of the pallet, a punch which makes it possible to knot the ends of the film strips. used, their cutting, and the retention of the free ends of film connected to the film unwinders, which must be wrapped around the next pallet again at the beginning of a new wrapping cycle.
  • kinematics used in the invention described in this document is nevertheless extremely complex and the punch used is also very complex in its structure and expensive to manufacture.
  • a complex operating kinematics for a machine causes many breakdowns and frequent revisions necessary for maintenance, and requires many laps at the end of the wrapping cycle to achieve the knotting.
  • the technical problem underlying the invention is therefore the realization of a device for wrapping the lateral faces and an upper face of a palletized load for locking and closing the wrapping with a limited number of turns. , allowing high rates, which is kinematic operation and simple structure, which is economical to manufacture, and inexpensive.
  • the invention proposes a wrapping device corresponding to claim 1.
  • portions of free strips of film connecting the palletized load and the unwinders are tensioned by the guide means above the palletized load.
  • the locking and closing of the wrapping of the load are carried out above the palletised load in less than one machine revolution.
  • the dispostif comprises two guiding means, located substantially on either side of the vertical axis of symmetry of the platform, a portion of each free film strip connecting the palletized load and the unwinders being intended to be stretched between the two guide means.
  • the two guide jaws are arranged in a substantially vertical position to substantially parallel each portion of free band stretched between them.
  • the cutting means comprise a heating wire attached to each locking jaw.
  • the welding means are arranged substantially in the vertical axis of symmetry of the platform.
  • the device comprises stabilizer means intended to bear on the upper face of the load when wrapping its side faces.
  • the stabilizer means comprising housings and / or passages for the welding means, the cutting means, the guide means and the locking means.
  • the stabilizer means on the one hand and the welding, cutting, guiding and locking means, on the other hand are movable relative to each other between a position in which the welding, cutting, guiding and blocking means are arranged above the lower surface of the stabilizer means and a position in which the welding, cutting, guiding and locking means are arranged below the lower surface. stabilizer means.
  • the stabilizer means, the welding, cutting, guiding and locking means are rotatable about an axis substantially coincident with the vertical axis of symmetry of the platform.
  • This degree of freedom of the stabilizer means, welding, cutting, guiding and locking means allows better guidance of the film strips regardless of the shape of the pallet.
  • the guiding means are constituted by means for moving the film unwinders.
  • the support means of the film unwinders consist of a horizontal ring disposed around the load and carried by at least three vertical feet of the frame.
  • the support means of the unwinders consist of a plurality of substantially vertical arms on each of which is mounted a mobile unwinder in translation, said arms being connected to a common axis of rotation substantially coincident with the vertical axis of symmetry of the platform.
  • the means for relative rotation of the unwinding devices and the load comprise a gantry to which is suspended the plurality of arms, and a motor for rotating said plurality of arms around the platform.
  • the means for relative rotation of the unwinding devices and the load comprise a rotary platform and a motor allowing the rotation of the platform around its vertical axis of symmetry.
  • the invention also relates to a wrapping method according to claim 10.
  • the figure 1 represents a wrapping device 1 of the lateral faces 2 and of an upper end face 3 of a palletized load - or pallet - 4.
  • the support means of the unwinding devices consist of two substantially vertical arms 9 on each of which is mounted an unwinder device 7 movable in vertical translation, said arms 9 being connected to a common axis of rotation 10 substantially coincident with the vertical axis of symmetry of the palette.
  • the means for relative rotation of the unwinding devices and the load comprise a gantry 11 to which the arms are suspended by their axis 10, and a motor (not shown in the drawing) allowing the rotation of the arms 9 around the load 4.
  • the wrapping operation is carried out in a conventional manner, by helical winding around the pallet of strips 16 of film, so as to wrap pallet 4.
  • the actual wrapping operation is known per se, and the present invention is particularly concerned with the step of locking the film strips at the end of wrapping.
  • the welding means are disposed substantially in the vertical axis of symmetry of the platform 6 and comprise two welding jaws 15 articulated each around a horizontal axis 17 integral with a support cylinder 18.
  • the support cylinder 18 is movable vertically relative to the palletized load, as shown in FIG. figure 1 by means of a pantograph 19.
  • the welding jaws 15 are movable from a first substantially horizontal position, as shown in FIG. figure 4 , in which they are housed in housings in the support cylinder and are in the extension of one another, at a second substantially vertical position, in which they project from the underside of the support cylinder and are close to each other to allow the welding of the free strips of film pressées them, connecting the palletized load and unwinders at the end of wrapping.
  • the guiding and locking means comprise two pairs of guiding jaws 12 and locking jaws 14 arranged on either side of the welding means 15.
  • the guide means comprise two guide jaws 12 each articulated around the horizontal axis 17 of a first substantially horizontal position in which they are housed in housings formed in the support cylinder 18 at a second substantially vertical position in which they are made. protruding from the underside of the support cylinder.
  • the two guide jaws 12 are intended, in a substantially vertical position, to tension between them a portion of each free band 13 of film connecting the palletized load and the unwinders at the end of wrapping and to arrange them in a substantially parallel manner, one for each report to the other.
  • the guiding jaws 12 comprises a notched face and a smooth face.
  • each free band 13 of film connecting the palletized load and the unwinders first bears on the smooth face of the guide jaw 12 located near the portion of this film strip. in contact with the pallet then bears on the notched face of the other guide jaw 12.
  • the locking means comprise two locking jaws 14 articulated each around the horizontal axis 17 of a first substantially horizontal position in which they are housed in the housings of the respective guide jaws 12 at a second substantially vertical position in which they project from the underside of the support cylinder 18.
  • the two locking jaws 14 are intended to cooperate with the notched face of the respective guiding jaws in order to block each free band of film connecting the palletized load and the unwinders at the end of wrapping.
  • the cutting means comprise a heating wire (not represented in the drawing) fixed on each locking jaw 14.
  • Each of these heating wires is arranged, during the locking of the wrapping between the welding means and the clamp formed by the guiding and locking means.
  • the support cylinder 18 Since the support cylinder 18 is vertically movable, it is possible to move it vertically so that its lower face comes to bear against the upper face of the palletized load to ensure its stability during wrapping, the support cylinder thus forms means forming a stabilizer.
  • the cutting means, blocking, guiding and welding are in their substantially horizontal position, they do not interfere with the stabilization of the palletized load since in this position, they do not protrude from the underside of the cylinder support.
  • Stabilization of the load during wrapping of its side faces may be necessary when the latter is of low weight.
  • the support cylinder is of course moved vertically upwards.
  • the support cylinder 18 is displaced vertically so as to bear on the upper face of the load 4.
  • the guiding jaws 12 and locking jaws 14 are in a substantially horizontal position, that is to say housed in the support cylinder 18, and block the free ends of the two film strips 8 extending from the two unwinders 7.
  • the film unwinders 7 are arranged above the palletized load 4.
  • the unwinders 7 pivot around the palletized load while being translated vertically from top to bottom and then from bottom to top so as to wrap the side faces of the pallet load.
  • the guide jaws 12 pivot in their substantially vertical position by same time that the support cylinder 18 is moved vertically upwards so as to release the free ends of the films extending from the unwinders 7 and allow the wrapping of the upper face of the load.
  • the unwinders pivot around said pallet until a portion of the free strips 13 of film connecting the latter and the unwinding devices are stretched between the jaws. 14 remain in a substantially vertical position and are parallel, as shown in FIG. figure 5 .
  • a first free web of film is stretched between a smooth face of a first guide jaw and a notched face of a second guide jaw, and a second free web of film is tensioned between a notched face of the second guiding jaws and a smooth face of the first guide jaw.
  • the welding jaws 15 pivot in their vertical position to weld the two free strips 13 of film, at a point of solder 20 located substantially in the vertical axis of symmetry of the pallet.
  • the locking of the wrapping of the pallet is then performed.
  • the guiding jaws 12 and locking 14 pivot in their substantially horizontal position while retaining the free end of each film portion disposed therebetween and the unwinders. This makes it possible to initiate the wrapping of a new pallet, as is the case with existing devices.
  • the closure and the locking of the wrapping of the lateral and upper faces of the palletized load are made in less than one rotation of the unwinders 7 around the load.
  • the figure 2 represents another variant of the invention.
  • wrapping device shown in FIG. figure 2 is a variant of the one shown in figure 1 , in particular in that it does not include two, but four film unwinders 7.
  • the welding means comprise a heating tong 21 arranged in the vertical axis of the palletised load and above it, integral with a support plate which is itself integral with the pantograph 19.
  • the cutting and locking means comprise four cutting pliers 22 integral with the support plate, each corresponding to a film unwinder.
  • Each of these clamps is arranged, during the locking of the wrapping between, on the one hand, the weld point 20 of the free strips of film connecting the palletized load and the unwinding devices at the end of wrapping, and on the other hand said unwinding devices
  • FIG. 4 schematically represent the different steps of locking the wrapping of a pallet with a device similar to that of the figure 2 .
  • FIGs 3 to 5 there is shown a configuration of the wrapping device of figure 2 , comprising only two film rollers.
  • the guide means are constituted, according to this embodiment of the invention, by moving means of the film unwinders.
  • the cutting tongs 22 then remain closed and retain the end 23 of each film portion disposed between said tongs and the unwinders, as shown in FIG. figure 5 . This makes it possible to initiate the wrapping of a new pallet, as is the case with existing devices.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Pallets (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)

Abstract

The invention concerns a strapping device comprising a frame (5), a platform (6) forming a palletized load support, means for supporting at least two film (8) unwinding devices (7), said means being mobile in vertical translation relative to the platform, means for relative rotation of the load and the film unwinding devices. The device also comprises guiding means for tensioning a portion of loose film strips linking the palletized load and the unwinding devices, at the end of the strapping process, means for locking the loose film strips, means for welding the tensioned portions of loose strips, means for cutting the loose strips arranged between the welding means and the locking means, the guiding, locking, welding and cutting means being arranged substantially above the palletized load, so as to lock the strapping at the upper surface.

Description

La présente invention concerne un dispositif de banderolage d'une charge palettisée permettant la fermeture à la face supérieure de ladite charge, et ie procédé de banderolage correspondant.The present invention relates to a device for wrapping a palletized load for closing the upper face of said load, and the corresponding wrapping process.

Par « banderolage », on entend le recouvrement total ou partiel de certains côtés d'une charge palettisée à l'aide de film, notamment par enroulement hélicoïdal. Le banderolage de la face supérieure de la charge peut n'être que tout à fait partiel, de manière simplement à permettre la mise en contact d'au moins deux bandes de film avec lesquelles on a réalisé le banderolage des faces latérales de la palette, et leur soudure au dessus de la charge palettisée."Wrapping" means the total or partial recovery of some sides of a palletized load using film, in particular by helical winding. The wrapping of the upper face of the load can be only quite partial, simply to allow the contacting of at least two strips of film with which the wrapping of the side faces of the pallet was made, and their welding above the palletized load.

Il est connu de banderoler des charges palettisées avec un film plastique étirable. De nombreux dispositifs existent, qui réalisent un tel banderolage de manière semi-automatique, voire automatique.It is known to wrap palletized loads with a plastic stretch film. Many devices exist, which perform such wrapping in a semi-automatic or automatic way.

En outre, on doit éventuellement pouvoir banderoler non seulement les faces latérales de la charge palettisée, mais également la face supérieure, afin de protéger la charge des infiltrations de poussière et d'eau, et également de réaliser une protection contre le vol de produits constituant la charge. On nomme généralement ce type de banderolage, du banderolage "cinq faces".In addition, it must be possible to wrap not only the side faces of the palletized load, but also the upper face, to protect the load from infiltration of dust and water, and also to provide protection against theft of products constituting load. This type of wrapping is usually called "five-sided" wrapping.

A cet effet, on utilise une machine, appelée également "banderoleuse", qui comprend un support pivotant ou non sur lequel est disposé la palette, un portique - ou équivalent - comprenant au moins un bras vertical sur lequel un chariot supportant un dispositif dérouleur de film, est mobile en translation verticale. Le chariot et la charge sont mobiles en rotation relativement l'un par rapport à l'autre, de sorte qu'au cours du banderolage, le film est disposé autour de la charge selon un mouvement hélicoïdal montant et/ou descendant.For this purpose, a machine, also called "wrapping machine", is used, which comprises a pivoting or non-pivoting support on which the pallet is placed, a gantry - or the like - comprising at least one vertical arm on which a carriage supporting an unwinder device. film, is mobile in vertical translation. The carriage and the load are rotatable relative to one another so that during wrapping, the film is arranged around the load in a rising and / or descending helical movement.

Le dispositif dérouleur étant monté rotatif autour d'un axe horizontal, sur le chariot, il est ainsi possible lors de la rotation du support pivotant, de déplacer le chariot au-dessus de la face supérieure de la charge palettisée, et d'incliner le dispositif dérouleur de film de façon à appliquer ce dernier horizontalement sur la face supérieure lorsque le chariot est redescendu.The unwinder device being rotatably mounted about a horizontal axis, on the carriage, it is thus possible during the rotation of the pivoting support, to move the carriage over the upper face of the palletized load, and to tilt the film unwinding device so as to apply the latter horizontally on the upper face when the carriage is down.

Eventuellement, la banderoleuse peut comprendre plusieurs bras munis chacun d'un chariot porteur d'un dispositif dérouleur de film. Ainsi, on augmente la cadence de banderolage. Néanmoins la banderoleuse est alors plus complexe à fabriquer et beaucoup plus coûteuse.Optionally, the wrapping machine may comprise several arms each provided with a carriage carrying a film unwinder device. Thus, the rate of wrapping is increased. Nevertheless the wrapping machine is then more complex to manufacture and much more expensive.

L'une des étapes importantes dans le procédé de banderolage est l'étape de fermeture et verrouillage. De cette étape, dépend l'efficacité du banderolage. En effet, le rôle de ce dernier n'est pas uniquement de tenir les différents éléments d'une palette, mais également d'éviter le vol de l'un ou de plusieurs des éléments constituant la palette.One of the important steps in the wrapping process is the closing and locking step. From this stage depends the effectiveness of the wrapping. Indeed, the role of the latter is not only to hold the various elements of a pallet, but also to avoid theft of one or more of the elements constituting the pallet.

La fermeture et le verrouillage de la palette sont traditionnellement réalisées en coupant la bande de film déroulée autour de la palette, et en soudant l'extrémité du film reliée à la palette aux bandes de film déjà enroulées autour de celle-ci, sur la face latérale de la palette.The closing and locking of the pallet are traditionally performed by cutting the strip of film unwound around the pallet, and welding the end of the film connected to the pallet to the film strips already wound around it, on the face side of the pallet.

Ainsi, l'extrémité libre de film doit adhérer à la charge dans la phase d'initialisation du banderolage, mais également, dans la phase finale du banderolage, l'extrémité terminale du film doit être fixée à la charge, coupée et réagrippée.Thus, the free end of film must adhere to the load in the initialization phase of the wrapping, but also, in the final phase of wrapping, the end of the film must be attached to the load, cut and reapplied.

Cette opération est réalisée en fin de banderolage grâce à des pinces coupantes de soudage disposées au bas de la plateforme formant support de la charge palettisée.This operation is carried out at the end of wrapping using welding cutting pliers arranged at the bottom of the platform forming the palletized load support.

Le désavantage des dispositifs de banderolage existants qui utilisent une telle disposition du système de verrouillage, est qu'il nécessite une cinématique particulière de banderolage.The disadvantage of existing wrapping devices that use such an arrangement of the locking system is that it requires a particular cinematic banding.

Afin d'augmenter les cadences de banderolage, on a perfectionné les dispositifs pinces de soudure-coupe. Or celles-ci sont au nombre d'au moins deux, ce qui rend le dispositif complexe et coûteux.In order to increase the banding rates, the welding-cutting tongs have been improved. But there are at least two, which makes the device complex and expensive.

Il était donc nécessaire de fournir un dispositif de banderolage qui permette des cadences élevées et qui soit économique à fabriquer, et peu coûteux.It was therefore necessary to provide a wrapping device that allows high speeds and is economical to manufacture, and inexpensive.

La demande de brevet européen EP 1 332 968 A1 correspondant au préambule de la revendication 1, vise à fournir une réponse en proposant un dispositif de banderolage grâce auquel la fermeture et le verrouillage de la palette sont réalisés par le haut de la charge palettisée, c'est-à-dire par sa face supérieure.The European patent application EP 1 332 968 A1 corresponding to the preamble of claim 1, aims to provide an answer by proposing a wrapping device by which the closure and locking of the pallet are performed by the top of the palletized load, that is to say by its upper face .

Le dispositif de banderolage décrit dans cette demande de brevet utilise un poinçon unique disposé dans l'axe vertical de symétrie de la palette, poinçon qui permet de réaliser un nouage des extrémités des bandes de film utilisées, leur découpe, et la retenue des extrémités libres de film reliées aux dérouleurs de film, qui doivent être enroulées de nouveau autour de la palette suivante au début d'un nouveau cycle de banderolage.The wrapping device described in this patent application uses a single punch placed in the vertical axis of symmetry of the pallet, a punch which makes it possible to knot the ends of the film strips. used, their cutting, and the retention of the free ends of film connected to the film unwinders, which must be wrapped around the next pallet again at the beginning of a new wrapping cycle.

La cinématique mise en oeuvre dans l'invention décrite dans ce document est néanmoins extrêmement complexe et le poinçon utilisé est également très complexe dans sa structure et coûteux à fabriquer. En outre, une cinématique de fonctionnement complexe pour une machine, provoque de nombreuses pannes et de fréquentes révisions nécessaires pour la maintenance, et nécessite de nombreux tours en fin de cycle de banderolage pour réaliser le nouage.The kinematics used in the invention described in this document is nevertheless extremely complex and the punch used is also very complex in its structure and expensive to manufacture. In addition, a complex operating kinematics for a machine, causes many breakdowns and frequent revisions necessary for maintenance, and requires many laps at the end of the wrapping cycle to achieve the knotting.

Il est donc nécessaire de fournir un dispositif de banderolage qui permette de résoudre les désavantages précédemment cités.It is therefore necessary to provide a wrapping device that solves the disadvantages mentioned above.

Le problème technique à la base de l'invention est donc la réalisation d'un dispositif de banderolage des faces latérales et d'une face supérieure d'une charge palettisée permettant de réaliser le verrouillage et la fermeture du banderolage avec un nombre de tours limité, permettant des cadences élevées, qui soit de cinématique de fonctionnement et de structure simple, qui soit économique à fabriquer, et peu coûteux.The technical problem underlying the invention is therefore the realization of a device for wrapping the lateral faces and an upper face of a palletized load for locking and closing the wrapping with a limited number of turns. , allowing high rates, which is kinematic operation and simple structure, which is economical to manufacture, and inexpensive.

A cet effet, l'invention propose un dispositif de banderolage correspondant à la revendication 1.For this purpose, the invention proposes a wrapping device corresponding to claim 1.

Ainsi, en fin de banderolage, par le mouvement des dérouleurs, des portions de bandes libres de film reliant la charge palettisée et les dérouleurs sont tendues par les moyens de guidage au dessus de la charge palettisée.Thus, at the end of the wrapping, by the movement of the unwinders, portions of free strips of film connecting the palletized load and the unwinders are tensioned by the guide means above the palletized load.

Puis, la rotation des dérouleurs est stoppée, et les portions de bandes tendues sont soudées entre elles en un seul point de soudure au dessus de la charge palettisée par l'intermédiaire des moyens de soudure.Then, the rotation of the unwinders is stopped, and the stretched strip portions are welded together at a single weld point above the palletized load via the welding means.

Lorsque les bandes de film reliant la charge palettisée et les dérouleurs sont soudées entre elles et bloquées par les moyens de blocage, on réalise la coupe des portions de film situées entre ces derniers et le point de soudure des bandes par les moyens de coupe. On obtient ainsi la fermeture et le verrouillage du banderolage de la charge.When the film strips connecting the palletized load and the unwinders are welded together and blocked by the locking means, the film portions located between the latter and the weld point of the strips are cut by the cutting means. The closing and locking of the wrapping of the load is thus obtained.

Selon la présente invention, le verrouillage et la fermeture du banderolage de la charge sont réalisés au dessus de la charge palettisée en moins d'un tour machine.According to the present invention, the locking and closing of the wrapping of the load are carried out above the palletised load in less than one machine revolution.

Il en résulte une cinématique de fonctionnement simple et des cadences élevées de banderolage.This results in a simple operating kinematics and high rates of wrapping.

En outre, la soudure des portions de bandes libres de film reliant la charge palettisée et les dérouleurs est réalisée en un seul endroit, ce qui réduit fortement le coût du verrouillage et de la fermeture du banderolage d'une charge palettisée.In addition, the welding of the portions of film free bands connecting the palletized load and the unwinders is performed in one place, which greatly reduces the cost of locking and closing the wrapping of a pallet load.

Selon une caractéristique de l'invention, le dispostif comprend deux moyens de guidage, situés sensiblement de part et d'autre de l'axe vertical de symétrie de la plateforme, une portion de chaque bande libre de film reliant la charge palettisée et les dérouleurs étant destinée à être tendue entre les deux moyens de guidage.According to a characteristic of the invention, the dispostif comprises two guiding means, located substantially on either side of the vertical axis of symmetry of the platform, a portion of each free film strip connecting the palletized load and the unwinders being intended to be stretched between the two guide means.

Avantageusement, les deux mors de guidage sont agencés en position sensiblement verticale pour disposer de manière sensiblement parallèle chaque portion de bande libre tendue entre eux.Advantageously, the two guide jaws are arranged in a substantially vertical position to substantially parallel each portion of free band stretched between them.

Ce positionnement permet une meilleure soudure des bandes libres de film entre elles.This positioning allows better welding of the free film strips between them.

Avantageusement, les moyens de coupe comportent un fil chauffant fixé sur chaque mors de blocage.Advantageously, the cutting means comprise a heating wire attached to each locking jaw.

Selon une autre caractéristique de l'invention, les moyens de soudure sont disposés sensiblement dans l'axe vertical de symétrie de la plateforme.According to another characteristic of the invention, the welding means are arranged substantially in the vertical axis of symmetry of the platform.

Selon une autre caractéristique de l'invention, le dispositif comprend des moyens formant stabilisateur destinés à venir en appui sur la face supérieure de la charge lors du banderolage de ses faces latérales.According to another characteristic of the invention, the device comprises stabilizer means intended to bear on the upper face of the load when wrapping its side faces.

Avantageusement, les moyens formant stabilisateur comportant des logements et/ou des passages pour les moyens de soudure, les moyens de coupe, les moyens de guidage et les moyens de blocage.Advantageously, the stabilizer means comprising housings and / or passages for the welding means, the cutting means, the guide means and the locking means.

Selon une autre caractéristique de l'invention, les moyens formant stabilisateur d'une part et les moyens de soudure, de coupe, de guidage et de blocage, d'autre part sont mobiles les uns par rapport aux autres entre une position dans laquelle les moyens de soudure, de coupe, de guidage et de blocage sont disposés au dessus de la surface inférieure des moyens formant stabilisateur et une position dans laquelle les moyens de soudure, de coupe, de guidage et de blocage sont disposés en dessous de la surface inférieure des moyens formant stabilisateur.According to another characteristic of the invention, the stabilizer means on the one hand and the welding, cutting, guiding and locking means, on the other hand are movable relative to each other between a position in which the welding, cutting, guiding and blocking means are arranged above the lower surface of the stabilizer means and a position in which the welding, cutting, guiding and locking means are arranged below the lower surface. stabilizer means.

Avantageusement, les moyens formant stabilisateur, les moyens de soudure, de coupe, de guidage et de blocage sont mobiles en rotation autour d'un axe sensiblement confondu avec l'axe vertical de symétrie de la plateforme.Advantageously, the stabilizer means, the welding, cutting, guiding and locking means are rotatable about an axis substantially coincident with the vertical axis of symmetry of the platform.

Ce degré de liberté des moyens formant stabilisateur, des moyens de soudure, de coupe, de guidage et de blocage permet un meilleur guidage des bandes de film quelle que soit la forme de la palette.This degree of freedom of the stabilizer means, welding, cutting, guiding and locking means allows better guidance of the film strips regardless of the shape of the pallet.

Selon une autre alternative de l'invention, les moyens de guidage sont constitués par des moyens de déplacement des dérouleurs de film.According to another alternative of the invention, the guiding means are constituted by means for moving the film unwinders.

Dans un mode de réalisation de l'invention, les moyens de support des dérouleurs de film consistent en un anneau horizontal disposé autour de la charge et porté par au moins trois pieds verticaux du châssis.In one embodiment of the invention, the support means of the film unwinders consist of a horizontal ring disposed around the load and carried by at least three vertical feet of the frame.

Selon une autre alternative, les moyens de support des dérouleurs consistent en une pluralité de bras sensiblement verticaux sur chacun desquels est monté un dérouleur mobile en translation, lesdits bras étant reliés à un axe commun de rotation sensiblement confondu avec l'axe vertical de symétrie de la plateforme.According to another alternative, the support means of the unwinders consist of a plurality of substantially vertical arms on each of which is mounted a mobile unwinder in translation, said arms being connected to a common axis of rotation substantially coincident with the vertical axis of symmetry of the platform.

Avantageusement, les moyens de mise en rotation relative des dispositifs dérouleurs et de la charge, comprennent un portique auquel est suspendue la pluralité de bras, et un moteur permettant la mise en rotation de ladite pluralité de bras autour de la plateforme.Advantageously, the means for relative rotation of the unwinding devices and the load comprise a gantry to which is suspended the plurality of arms, and a motor for rotating said plurality of arms around the platform.

Selon une autre alternative, les moyens de mise en rotation relative des dispositifs dérouleurs et de la charge, comprennent une plateforme rotative et un moteur permettant la mise rotation de la plateforme autour de son axe vertical de symétrie.According to another alternative, the means for relative rotation of the unwinding devices and the load, comprise a rotary platform and a motor allowing the rotation of the platform around its vertical axis of symmetry.

L'invention concerne également un procédé de banderolage correspondant à la revendication 10.The invention also relates to a wrapping method according to claim 10.

Il est à noter que les étapes consistant à bloquer les bandes libres de film reliant la charge palettisée et les dérouleurs et à souder les portions de bandes libres tendues entre elles en un point de soudure, peuvent être interverties.It should be noted that the steps of blocking the free strips of film connecting the palletized load and the unwinders and soldering the portions of free bands stretched together at a weld point, can be interchanged.

Avantageusement, le procédé de banderolage comprend une étape consistant à :

  • stabiliser la charge palettisée durant le banderolage de ses faces latérales, en appuyant sur sa face supérieure.
Advantageously, the wrapping method comprises a step consisting of:
  • stabilize the palletised load during the wrapping of its lateral faces, by pressing on its upper face.

Pour sa bonne compréhension, l'invention est à nouveau décrite ci-dessous en référence au dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme de réalisation préférée du dispositif de banderolage selon l'invention.

  • Figure 1 est une vue schématique de profil d'une première forme d'exécution d'un dispositif selon l'invention comportant deux dispostifs dérouleurs de film ;
  • Figure 2 en est une vue agrandie, en perspective, montrant les moyens de guidage, de blocage et de soudure des bandes libres de film reliant la charge palettisée et les dérouleurs, en fin de banderolage ;
  • Figure 3 est une vue schématique en coupe selon la ligne III-III de figure 1;
  • Figure 4 à 5 sont des vues schématiques en perspective illustrant différentes étapes du banderolage d'une charge palettisée effectué à l'aide d'un dispositif selon l'invention ;
For a good understanding, the invention is again described below with reference to the attached schematic drawing showing, by way of non-limiting example, a preferred embodiment of the wrapping device according to the invention.
  • Figure 1 is a schematic side view of a first embodiment of a device according to the invention comprising two film unwinding devices;
  • Figure 2 is an enlarged view, in perspective, showing the means for guiding, blocking and welding the free strips of film connecting the palletized load and the unwinders at the end of wrapping;
  • Figure 3 is a schematic sectional view along line III-III of figure 1 ;
  • Figure 4 to 5 are schematic perspective views illustrating different stages of wrapping a palletized load carried out using a device according to the invention;

La figure 1 représente un dispositif de banderolage 1 des faces latérales 2 et d'une face d'extrémité supérieure 3 d'une charge palettisée - ou palette - 4.The figure 1 represents a wrapping device 1 of the lateral faces 2 and of an upper end face 3 of a palletized load - or pallet - 4.

Dans la description qui suit, on suppose que les axes verticaux de symétrie de la palette et de la plateforme sur laquelle elle est posée, sont confondus.In the following description, it is assumed that the vertical symmetry axes of the pallet and the platform on which it is placed, are merged.

Ce dispositif de banderolage 1 comprend:

  • un châssis 5,
  • une plateforme 6 formant support de la charge 4,
  • des moyens de support de dispositifs dérouleurs 7 de film, lesdits moyens étant mobiles en translation verticale par rapport à la charge palettisée 4,
  • des moyens de mise en rotation relative de la charge 4 et des dispositifs dérouleurs 7 de film 8, autour d'un axe sensiblement confondu avec l'axe verticale de symétrie de la charge.
This wrapping device 1 comprises:
  • a chassis 5,
  • a platform 6 forming a support for the load 4,
  • means for supporting film unwinding devices 7, said means being movable in vertical translation with respect to the palletized load 4,
  • means for relative rotation of the load 4 and the unwinding devices 7 of film 8, around an axis substantially coincident with the vertical axis of symmetry of the load.

Comme on peut le voir à la figure 1, les moyens de support des dispositifs dérouleurs consistent en deux bras 9 sensiblement verticaux sur chacun desquels est monté un dispositif dérouleur 7 mobile en translation verticale, lesdits bras 9 étant reliés à un axe commun de rotation 10 sensiblement confondu avec l'axe vertical de symétrie de la palette.As can be seen at figure 1 , the support means of the unwinding devices consist of two substantially vertical arms 9 on each of which is mounted an unwinder device 7 movable in vertical translation, said arms 9 being connected to a common axis of rotation 10 substantially coincident with the vertical axis of symmetry of the palette.

Les moyens de mise en rotation relative des dispositifs dérouleurs et de la charge, comprennent un portique 11 auquel sont suspendus les bras par leur axe 10, et un moteur (non illustré au dessin) permettant la mise en rotation des bras 9 autour de la charge 4.The means for relative rotation of the unwinding devices and the load, comprise a gantry 11 to which the arms are suspended by their axis 10, and a motor (not shown in the drawing) allowing the rotation of the arms 9 around the load 4.

Selon l'invention le dispositif de banderolage 1 comprend en outre :

  • des moyens de guidage 12, situés sensiblement de part et d'autre de l'axe vertical de symétrie de la plateforme 6, destinés à tendre une portion des bandes libres 13 de film reliant la charge palettisée et les dérouleurs, en fin de banderolage, en un point situé entre le dérouleur et la charge,
  • des moyens de blocage 14 des bandes libres 13 de film reliant la charge palettisée et les dérouleurs,
  • des moyens de soudure 15 des portions de bandes libres tendues,
  • des moyens de coupe des bandes libres disposés entre les moyens de soudure et les moyens de blocage,
  • les moyens de guidage, de blocage, de soudure et de coupe étant disposés sensiblement au-dessus de la charge palettisée, de manière à verrouiller le banderolage au niveau de la face supérieure 3 de ladite charge.
According to the invention the wrapping device 1 further comprises:
  • guide means 12, situated substantially on either side of the vertical axis of symmetry of the platform 6, intended to stretch a portion of the free strips 13 of film connecting the palletized load and the unwinders, at the end of wrapping, at a point between the unwinder and the load,
  • locking means 14 of the free strips 13 of film connecting the palletised load and the unwinders,
  • means 15 for welding portions of free tensioned strips,
  • cutting means of the free strips disposed between the welding means and the locking means,
  • the guiding, blocking, welding and cutting means being disposed substantially above the palletised load, so as to lock the wrapping at the upper face 3 of said load.

On aura compris à la lecture du dessin que l'opération de banderolage est réalisée de manière classique, par enroulement hélicoïdal autour de la palette de bandes 16 de film, de manière à envelopper la palette 4. L'opération de banderolage proprement dite est connue en soi, et la présente invention porte particulièrement sur l'étape de verrouillage des bandes de film en fin de banderolage.It will be understood from reading the drawing that the wrapping operation is carried out in a conventional manner, by helical winding around the pallet of strips 16 of film, so as to wrap pallet 4. The actual wrapping operation is known per se, and the present invention is particularly concerned with the step of locking the film strips at the end of wrapping.

Les moyens de soudure sont disposés sensiblement dans l'axe vertical de symétrie de la plateforme 6 et comprennent deux mors de soudage 15 articulés chacun autour d'un axe horizontal 17 solidaire d'un cylindre support 18. Le cylindre support 18 est déplaçable verticalement par rapport à la charge palettisée, comme cela est représenté à la figure 1, au moyen d'un pantographe 19.The welding means are disposed substantially in the vertical axis of symmetry of the platform 6 and comprise two welding jaws 15 articulated each around a horizontal axis 17 integral with a support cylinder 18. The support cylinder 18 is movable vertically relative to the palletized load, as shown in FIG. figure 1 by means of a pantograph 19.

Les mors de soudage 15 sont mobiles d'une première position sensiblement horizontale, comme montré à la figure 4, dans laquelle ils sont logés dans des logements ménagées dans le cylindre support et se trouvent dans le prolongement l'un de l'autre, à une seconde position sensiblement verticale, dans laquelle ils font saillie de la face inférieure du cylindre support et se trouvent à proximité l'un de l'autre afin de permettre la soudure des bandes libres de film préssées entre eux, reliant la charge palettisée et les dérouleurs, en fin de banderolage.The welding jaws 15 are movable from a first substantially horizontal position, as shown in FIG. figure 4 , in which they are housed in housings in the support cylinder and are in the extension of one another, at a second substantially vertical position, in which they project from the underside of the support cylinder and are close to each other to allow the welding of the free strips of film pressées them, connecting the palletized load and unwinders at the end of wrapping.

Les moyens de guidage et de blocage comportent deux paires de mors de guidage 12 et de blocage 14 disposées de part et d'autre des moyens de soudure 15.The guiding and locking means comprise two pairs of guiding jaws 12 and locking jaws 14 arranged on either side of the welding means 15.

Les moyens de guidage comportent deux mors de guidage 12 articulés chacun autour de l'axe horizontal 17 d'une première position sensiblement horizontale dans laquelle ils sont logés dans des logements ménagées dans le cylindre support 18 à une seconde position sensiblement verticale dans laquelle ils font saillie de la face inférieure du cylindre support.The guide means comprise two guide jaws 12 each articulated around the horizontal axis 17 of a first substantially horizontal position in which they are housed in housings formed in the support cylinder 18 at a second substantially vertical position in which they are made. protruding from the underside of the support cylinder.

Les deux mors de guidage 12 sont destinés, en position sensiblement verticale, à tendre entre eux une portion de chaque bande libre 13 de film reliant la charge palettisée et les dérouleurs en fin de banderolage et à les disposer de manière sensiblement parallèle l'une par rapport à l'autre.The two guide jaws 12 are intended, in a substantially vertical position, to tension between them a portion of each free band 13 of film connecting the palletized load and the unwinders at the end of wrapping and to arrange them in a substantially parallel manner, one for each report to the other.

Les mors de guidage 12 comporte une face cranté et une face lisse.The guiding jaws 12 comprises a notched face and a smooth face.

En fin de banderolage, par le mouvement des dérouleurs, chaque bande libre 13 de film reliant la charge palettisée et les dérouleurs prend d'abord appui sur la face lisse du mors de guidage 12 se trouvant à proximité de la portion de cette bande de film en contact avec la palette puis prend appui sur la face crantée de l'autre mors de guidage 12.At the end of wrapping, by the movement of the unwinders, each free band 13 of film connecting the palletized load and the unwinders first bears on the smooth face of the guide jaw 12 located near the portion of this film strip. in contact with the pallet then bears on the notched face of the other guide jaw 12.

Les moyens de blocage comportent deux mors de blocage 14 articulés chacun autour de l'axe horizontal 17 d'une première position sensiblement horizontale dans laquelle ils sont logés dans les logements des mors de guidage 12 respectifs à une seconde position sensiblement verticale dans laquelle ils font saillie de la face inférieure du cylindre support 18.The locking means comprise two locking jaws 14 articulated each around the horizontal axis 17 of a first substantially horizontal position in which they are housed in the housings of the respective guide jaws 12 at a second substantially vertical position in which they project from the underside of the support cylinder 18.

Les deux mors de blocage 14 sont destinés à coopérer avec la face crantée des mors de guidage respectifs afin de bloquer chaque bande libre de film reliant la charge palettisée et les dérouleurs, en fin de banderolage.The two locking jaws 14 are intended to cooperate with the notched face of the respective guiding jaws in order to block each free band of film connecting the palletized load and the unwinders at the end of wrapping.

Selon l'invention, les moyens de coupe comportent un fil chauffant (non représenté au dessin) fixé sur chaque mors de blocage 14. Chacun de ces fils chauffant est disposé, lors du verrouillage du banderolage entre les moyens de soudure et la pince formée par les moyens de guidage et de blocage.According to the invention, the cutting means comprise a heating wire (not represented in the drawing) fixed on each locking jaw 14. Each of these heating wires is arranged, during the locking of the wrapping between the welding means and the clamp formed by the guiding and locking means.

Après la coupe, l'extrémité d'une bande reliée au dérouleur est donc maintenue dans la pince formée par les moyens de guidage et de blocage.After cutting, the end of a strip connected to the unwinder is thus maintained in the clamp formed by the guiding and locking means.

Etant donné que le cylindre support 18 est mobile verticalement, il est possible de le déplacer verticalement pour que sa face inférieure vienne prendre appui contre la face supérieure de la charge palettisée afin d'assurer sa stabilité durant le banderolage, le cylindre support forme ainsi des moyens formant stabilisateur.Since the support cylinder 18 is vertically movable, it is possible to move it vertically so that its lower face comes to bear against the upper face of the palletized load to ensure its stability during wrapping, the support cylinder thus forms means forming a stabilizer.

Dans ce cas, les moyens de coupe, de blocage, de guidage et de soudure sont dans leur position sensiblement horizontale, ils ne gênent donc pas la stabilisation de la charge palettisée puisque dans cette position, ils ne font pas saillie de la face inférieure du cylindre support.In this case, the cutting means, blocking, guiding and welding are in their substantially horizontal position, they do not interfere with the stabilization of the palletized load since in this position, they do not protrude from the underside of the cylinder support.

La stabilisation de la charge durant le banderolage de ses faces latérales peut être nécessaire lorsque cette dernière est de faible poids.Stabilization of the load during wrapping of its side faces may be necessary when the latter is of low weight.

Dans ce cas, afin de permettre le banderolage de la face supérieure de la palette, en fin de banderolage, le cylindre support est bien entendu déplacé verticalement vers le haut.In this case, in order to allow the wrapping of the upper face of the pallet, at the end of wrapping, the support cylinder is of course moved vertically upwards.

Nous allons décrire ci-après un cycle de banderolage d'une palette à l'aide du dispositif selon l'invention, dans lequel la stabilisation de la charge est mise en oeuvre.We will describe below a wrapping cycle of a pallet using the device according to the invention, wherein the stabilization of the load is implemented.

Dans ce cas, au début du cycle, le cylindre support 18 est déplacé verticalement de manière à venir en appui sur la face supérieure de la charge 4.In this case, at the beginning of the cycle, the support cylinder 18 is displaced vertically so as to bear on the upper face of the load 4.

Au départ d'un cycle de banderolage, les mors de guidage 12 et de blocage 14 sont en position sensiblement horizontale, c'est-à-dire logés dans le cylindre support 18, et bloquent les extrémités libres des deux bandes de film 8 s'étendant depuis les deux dérouleurs 7.At the start of a wrapping cycle, the guiding jaws 12 and locking jaws 14 are in a substantially horizontal position, that is to say housed in the support cylinder 18, and block the free ends of the two film strips 8 extending from the two unwinders 7.

Au début d'un cycle de banderolage, les dérouleurs 7 de film sont disposés au dessus de la charge palettisée 4.At the beginning of a wrapping cycle, the film unwinders 7 are arranged above the palletized load 4.

Lorsque le cycle est lancé, les dérouleurs 7 pivotent autour de la charge palettisée tout en étant translatés verticalement de haut en bas puis de bas en haut de sorte à banderoler les faces latérales de la charge palettisée.When the cycle is started, the unwinders 7 pivot around the palletized load while being translated vertically from top to bottom and then from bottom to top so as to wrap the side faces of the pallet load.

Il est à noter qu'il n'est pas nécessaire de réaliser un banderolage total des faces latérales de la charge palettisée.It should be noted that it is not necessary to totally wrap the side faces of the palletized load.

Lorsque les faces latérales 2 de la palette 4 sont recouvertes de film, depuis le bas vers le haut, et que les dérouleurs 7 ont translaté verticalement pour être disposés au dessus de la charge, les mors de guidage 12 pivotent dans leur position sensiblement verticale en même temps que le cylindre support 18 est déplacé verticalement vers le haut de manière à libérer les extrémités libres des films s'étendant depuis les dérouleurs 7 et à permettre le banderolage de la face supérieure de la charge.When the side faces 2 of the pallet 4 are covered with film, from the bottom upwards, and the unwinders 7 have moved vertically to be arranged above the load, the guide jaws 12 pivot in their substantially vertical position by same time that the support cylinder 18 is moved vertically upwards so as to release the free ends of the films extending from the unwinders 7 and allow the wrapping of the upper face of the load.

Pendant, le déplacement du cylindre support 18 et des mors de guidage 12, les dérouleurs pivotent autour de ladite palette, jusqu'à ce qu'une portion des bandes libres 13 de film reliant cette dernière et les dispositifs dérouleurs, soient tendues entre les mors de guidage 14 restés en position sensiblement verticale et soient parallèles, comme cela est représenté à la figure 5.During the displacement of the support cylinder 18 and the guide jaws 12, the unwinders pivot around said pallet until a portion of the free strips 13 of film connecting the latter and the unwinding devices are stretched between the jaws. 14 remain in a substantially vertical position and are parallel, as shown in FIG. figure 5 .

Dans cette position, une première bande libre de film est tendue entre une face lisse d'un premier mors de guidage et une face crantée d'un second mors de guidage, et une seconde bande libre de film est tendue entre une face crantée du second mors de guidage et une face lisse du premier mors de guidage.In this position, a first free web of film is stretched between a smooth face of a first guide jaw and a notched face of a second guide jaw, and a second free web of film is tensioned between a notched face of the second guiding jaws and a smooth face of the first guide jaw.

Puis, la rotation des dérouleurs 7 est stoppée, et les mors de blocage 14 pivotent dans leur position sensiblement verticale, afin de coopérer avec les mors de guidage pour bloquer les bandes libres de film reliant la charge palettisée et les dérouleurs.Then, the rotation of the unwinders 7 is stopped, and the locking jaws 14 pivot in their substantially vertical position, to cooperate with the guide jaws to block the free strips of film connecting the pallet load and the unwinders.

Ensuite, les mors de soudage 15 pivotent dans leur position verticale afin de souder les deux bandes libres 13 de film, en un point de soudure 20 situé sensiblement dans l'axe vertical de symétrie de la palette. Le verrouillage du banderolage de la palette est alors réalisé.Then, the welding jaws 15 pivot in their vertical position to weld the two free strips 13 of film, at a point of solder 20 located substantially in the vertical axis of symmetry of the pallet. The locking of the wrapping of the pallet is then performed.

Puis, le fils de coupe fixé sur chaque mors de blocage 14 est chauffé et coupe les portions de film qui reliaient encore les dérouleurs et le point central de soudure.Then, the cutting son fixed on each locking jaw 14 is heated and cuts the portions of film that still connected the unwinders and the central point of welding.

Enfin, les mors de guidage 12 et de blocage 14 pivotent dans leur position sensiblement horizontale tout en retenant l'extrémité libre de chaque portion de film disposée entre ceux-ci et les dérouleurs. Ceci permet d'initier le banderolage d'une nouvelle palette, comme c'est le cas avec les dispositifs existants.Finally, the guiding jaws 12 and locking 14 pivot in their substantially horizontal position while retaining the free end of each film portion disposed therebetween and the unwinders. This makes it possible to initiate the wrapping of a new pallet, as is the case with existing devices.

Il est à noter que l'utilisation du cylindre support comme stabilisateur de charge est optionnelle.It should be noted that the use of the support cylinder as a load stabilizer is optional.

Selon ce mode de réalisation de l'invention, la fermeture et le verrouillage du banderolage des faces latérales et supérieure de la charge palettisée sont réalisés en moins d'une rotation des dérouleurs 7 autour de la charge.According to this embodiment of the invention, the closure and the locking of the wrapping of the lateral and upper faces of the palletized load are made in less than one rotation of the unwinders 7 around the load.

La figure 2 représente une autre variante de l'invention. Dans cette variante de l'invention, les mêmes éléments que précédemment portent les mêmes références numériques.The figure 2 represents another variant of the invention. In this variant of the invention, the same elements as previously bear the same numerical references.

On remarquera que le dispositif de banderolage représenté à la figure 2, est une variante de celui représenté à la figure 1, notamment en ce qu'il ne comporte pas deux, mais quatre dispositifs dérouleurs 7 de film.It will be noted that the wrapping device shown in FIG. figure 2 , is a variant of the one shown in figure 1 , in particular in that it does not include two, but four film unwinders 7.

En outre, selon cette variante, les moyens de soudure comprennent une pince chauffante 21 disposée dans l'axe vertical de la charge palettisée et au-dessus de celle-ci, solidaire d'une plaque support elle-même solidaire du pantographe 19.In addition, according to this variant, the welding means comprise a heating tong 21 arranged in the vertical axis of the palletised load and above it, integral with a support plate which is itself integral with the pantograph 19.

Les moyens de coupe et de blocage comprennent quatre pinces de coupe 22 solidaire de la plaque support, chacune correspondant à un dérouleur de film.The cutting and locking means comprise four cutting pliers 22 integral with the support plate, each corresponding to a film unwinder.

Chacune de ces pinces est disposée, lors du verrouillage du banderolage entre, d'une part, le point de soudure 20 des bandes libres de film reliant la charge palettisée et les dispositifs dérouleurs en fin de banderolage, et d'autre part lesdits dispositifs dérouleursEach of these clamps is arranged, during the locking of the wrapping between, on the one hand, the weld point 20 of the free strips of film connecting the palletized load and the unwinding devices at the end of wrapping, and on the other hand said unwinding devices

comme représenté aux figures 4 et 5. Les figures 3 à 5 représentent schématiquement les différentes étapes d'un verrouillage du banderolage d'une palette grâce au un dispositif similaire de celui de la figure 2.as represented at Figures 4 and 5 . The Figures 3 to 5 schematically represent the different steps of locking the wrapping of a pallet with a device similar to that of the figure 2 .

Pour des raisons de clarté, dans les figures 3 à 5, on a représenté une configuration du dispositif de banderolage de figure 2, comprenant uniquement deux dérouleurs de film.For the sake of clarity, in Figures 3 to 5 , there is shown a configuration of the wrapping device of figure 2 , comprising only two film rollers.

Lorsque les faces latérales 2 de la palette 4 ont été recouvertes de film, depuis le bas vers le haut, et que les dérouleurs 7 de film se sont déplacés verticalement pour être disposés au-dessus de la palette, ces dérouleurs pivotent autour de ladite palette, jusqu'à ce que les portions de film 13 reliant cette dernière et les dispositifs dérouleurs, soient tendues et parallèles, comme cela est représenté à la figure 3.When the side faces 2 of the pallet 4 have been covered with film, from the bottom upwards, and the film unwinders 7 have moved vertically to be arranged above the pallet, these unwinders pivot around said pallet , until the portions of film 13 connecting the latter and the unwinding devices, are stretched and parallel, as shown in FIG. figure 3 .

Ainsi, les moyens de guidage sont constitués, selon cette variante de réalisation de l'invention, par des moyens de déplacement des dérouleurs de film.Thus, the guide means are constituted, according to this embodiment of the invention, by moving means of the film unwinders.

Puis la rotation des dérouleurs 7 est stoppée, et la pince centrale 21 de soudure se referme, comme montré à la figure 4, pour venir souder les deux portions de film, en un point de soudure 20 situé sensiblement dans l'axe vertical de symétrie de la palette. Le verrouillage du banderolage de la palette est alors réalisé.Then the rotation of the unwinders 7 is stopped, and the central welding clamp 21 closes, as shown in FIG. figure 4 , to come weld the two portions of film, at a weld point 20 located substantially in the vertical axis of symmetry of the pallet. The locking of the wrapping of the pallet is then performed.

Enfin, la rotation des dérouleurs 7 reprend de sorte que les portions 13 de film disposées entre les dérouleurs 7 et le point de soudure 20 qui vient juste d'être réalisé, soient disposées en regard des pinces de coupe en position ouverte. Ces dernières sont alors refermées et coupent les portions de film qui reliaient encore les dérouleurs et le point central de soudure.Finally, the rotation of the unwinders 7 resumes so that the portions 13 of film disposed between the unwinders 7 and the weld point 20 which has just been made, are arranged opposite the cutting clamps in the open position. The latter are then closed and cut the portions of film that still connected the unwinders and the central point of welding.

Les pinces de coupe 22 restent ensuite fermées et retiennent l'extrémité 23 de chaque portion de film disposée entre lesdites pinces et les dérouleurs, comme cela est représenté à la figure 5. Ceci permet d'initier le banderolage d'une nouvelle palette, comme c'est le cas avec les dispositifs existants.The cutting tongs 22 then remain closed and retain the end 23 of each film portion disposed between said tongs and the unwinders, as shown in FIG. figure 5 . This makes it possible to initiate the wrapping of a new pallet, as is the case with existing devices.

Dans une variante d'exécution on réalise une rotation complète des bandes de film les unes autour des autres par rotation des dispositifs dérouleurs, avant de procéder à la soudure centrale.In an alternative embodiment a complete rotation of the film strips around each other by rotation of the unwinding devices, before proceeding to the central weld.

Il va de soi que l'invention n'est pas limitée aux formes d'exécution décrites ci-avant à titre d'exemples non limitatifs, mais qu'elle en embrasse au contraire toutes les variantes, selon les revendications suivantes.It goes without saying that the invention is not limited to the embodiments described above by way of non-limiting examples, but that it encompasses all variants, according to the following claims.

Claims (11)

  1. Device (1) for wrapping the side faces (2) and an upper face (3) of a palletised load (4), comprising:
    - a frame (5),
    - a platform (6) forming a support for the palletised load,
    - means for supporting at least two unwinding devices (7) for unwinding film (8), said means being able to move in vertical translation relative to the platform,
    - means for setting the load and the film unwinding devices in relative rotation about an axis substantially coincident with the vertical axis of symmetry of the platform,
    - guiding means (12, 7), located substantially on either side of the vertical axis of symmetry of the platform (6), designed to pull taut a portion of the free strips (13) of film connecting the palletised load and the unwinding devices, at the end of wrapping, at a point located between the unwinding device and the load,
    - means (14, 22) for immobilising the free strips (13) of film connecting the palletised load and the unwinding devices,
    - means (22) for cutting the free strips,
    characterised in that it comprises means (15, 21) for welding the taut free strip portions, the cutting means (22) being arranged between the welding means and the immobilising means,
    in that the guiding, immobilising, welding and cutting means are arranged substantially above the palletised load, so as to lock the wrapping on the upper face (3) of said load,
    in that the guiding and immobilising means comprise two pairs of guiding (12) and immobilising (14) jaws arranged on either side of the welding means (15), each free strip (13) of film connecting the palletised load and the unwinding devices, at the end of wrapping, being pulled taut between the guiding jaws (12) of the two pairs, and the immobilising jaws (14) of each pair being designed to immobilise a free strip (13) of film in contact with the respective guiding jaw, the jaws (12, 14) of each pair of jaws being able to move with respect to one another so as to form a clamp,
    and in that the immobilising (14) and guiding (12) jaws are each articulated between a first, substantially horizontal position and a second, substantially vertical position.
  2. Device (1) according to claim 1, characterised in that the two guiding jaws (12) are able, in the substantially vertical position, to arrange in a substantially parallel manner each free strip portion (13) held taut between them.
  3. Device (1) according to claim 1, characterised in that the cutting means comprise a heating wire fixed to each immobilising jaw.
  4. Device (1) according to one of claims 1 to 3, characterised in that the welding means (15, 21) are arranged substantially in the vertical axis of symmetry of the platform (4).
  5. Device (1) according to one of claims 1 to 4, characterised in that it comprises means forming a stabiliser (18) which are designed to come to bear against the upper face (3) of the load (6) during the wrapping of the side faces (2) thereof.
  6. Device (1) according to claim 5, characterised in that the means forming a stabiliser (18) comprise housings and/or passages for the welding means (15), the cutting means, the guiding means (12) and the immobilising means (14).
  7. Device (1) according to one of claims 5 and 6, characterised in that the means forming a stabiliser (18) on the one hand and the welding means (15), cutting means, guiding means (12) and immobilising means (14) on the other hand are able to move relative to one another between a position in which the welding means (15), cutting means, guiding means (12) and immobilising means (14) are arranged above the lower surface of the means forming a stabiliser (18) and a position in which the welding means (15), cutting means, guiding means (12) and immobilising means (14) are arranged below the lower surface of the means forming a stabiliser (18).
  8. Device (1) according to one of claims 1 to 7, characterised in that the welding means (15), cutting means, guiding means (12) and immobilising means (14) are able to move in rotation about an axis substantially coincident with the vertical axis of symmetry of the platform.
  9. Device (1) according to one of claims 5 to 8, characterised in that the means forming a stabiliser (18) are able to move in rotation about an axis substantially coincident with the vertical axis of symmetry of the platform.
  10. Method for wrapping the side faces (2) and an upper face (3) of a palletised load using the device according to claim 1, the method comprising the steps consisting of:
    covering the side faces (2) of a palletised load (4) with film using film unwinding devices (7) which are able to move in relative rotation with respect to the load and can be displaced vertically,
    - positioning the film unwinding devices (7) above the load (4),
    - pulling taut a portion of the free strips (13) of film connecting the palletised load and the unwinding devices, at the end of wrapping, above the load,
    - immobilising the free strips (13) of film connecting the palletised load and the unwinding devices between guiding and immobilising means which comprise two pairs of guiding (12) and immobilising (14) jaws arranged on either side of the welding means (15), each free strip (13) of film connecting the palletised load and the unwinding devices, at the end of wrapping, being pulled taut between the guiding jaws (12) of the two pairs, and the immobilising jaws (14) of each pair being designed to immobilise a free strip (13) of film in contact with the respective guiding jaw, the jaws (12, 14) of each pair of jaws being able to move with respect to one another so as to form a clamp, and the immobilising (14) and guiding (12) jaws are each articulated between a first, substantially horizontal position and a second, substantially vertical position,
    - welding the free strip portions (13) pulled taut between them at a welding point,
    - cutting the free strip portions (13) arranged between the welding point and the area where the free strips of film are immobilised.
  11. Wrapping method according to claim 10, characterised in that it comprises a step consisting of:
    - stabilising the palletised load during the wrapping of its side faces, by pressing on its upper face.
EP05786235A 2004-07-02 2005-07-01 Device for strapping a palletized load enabling the upper side of said load to be closed, and corresponding strapping method Not-in-force EP1763471B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0407368A FR2872486B1 (en) 2004-07-02 2004-07-02 DEVICE FOR BANDOLATING A PALLETIZED LOAD ENABLING THE CLOSURE ON THE UPPER FACE OF SAID LOAD, AND METHOD FOR BANDOLATING THE SAME
PCT/FR2005/001697 WO2006013266A1 (en) 2004-07-02 2005-07-01 Device for strapping a palletized load enabling the upper side of said load to be closed, and corresponding strapping method

Publications (2)

Publication Number Publication Date
EP1763471A1 EP1763471A1 (en) 2007-03-21
EP1763471B1 true EP1763471B1 (en) 2010-11-17

Family

ID=34948192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05786235A Not-in-force EP1763471B1 (en) 2004-07-02 2005-07-01 Device for strapping a palletized load enabling the upper side of said load to be closed, and corresponding strapping method

Country Status (5)

Country Link
EP (1) EP1763471B1 (en)
AT (1) ATE488432T1 (en)
DE (1) DE602005024807D1 (en)
FR (1) FR2872486B1 (en)
WO (1) WO2006013266A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1888235A1 (en) 2005-06-06 2008-02-20 Decision Biomarkers Incorporated Assays based on liquid flow over arrays
US20080229716A1 (en) * 2007-03-19 2008-09-25 Illinois Tool Works Inc. Film wrapping machine simultaneously utilizing two film carriage assemblies
US20080229714A1 (en) * 2007-03-19 2008-09-25 Illinois Tool Works Inc. Film wrapping machine utilizing two film carriage assemblies to effectively perform film change operations
ITMO20110075A1 (en) * 2011-04-11 2012-10-12 Aetna Group Spa WRAPPING MACHINE AND WINDING METHOD

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3344940A1 (en) * 1983-12-13 1985-06-20 Helmut 8561 Happurg Schenke METHOD FOR WRAPPING STACKED GOODS
US4905448A (en) * 1987-05-29 1990-03-06 Wrapmatic, Inc. Overhead stretch film wrap machines, including overhead stretch film wrap machines with film pre-stretch devices
IT1292174B1 (en) * 1997-06-17 1999-01-25 Fis Impianti S R L PACKAGING PROCEDURE AND RELATED AUTOMATIC WRAPPING EQUIPMENT FOR THE CREATION OF PACKAGES OF PALLETIZED LOADS,
AU3147600A (en) * 1999-03-11 2000-09-28 Seelen A/S A stretched film wrapper and a method of wrapping objects stacked on pallets
ITMI20020174A1 (en) * 2002-01-31 2003-07-31 Sipak S R L PALLET BANDING MACHINE WITH OPPOSITE COILS AND RELATED METHOD OF PACKAGING
FR2842503B1 (en) * 2002-07-17 2005-01-14 Itw Mima Systems WRAPPING
FI125041B (en) * 2003-04-22 2015-05-15 Signode Internat Ip Holdings Llc Wrapping machine and method of wrapping a plastic wrap web around a product

Also Published As

Publication number Publication date
EP1763471A1 (en) 2007-03-21
FR2872486A1 (en) 2006-01-06
WO2006013266A1 (en) 2006-02-09
ATE488432T1 (en) 2010-12-15
FR2872486B1 (en) 2008-02-15
DE602005024807D1 (en) 2010-12-30

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