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EP0052057B1 - Method and apparatus for covering a load with a tubular envelope - Google Patents

Method and apparatus for covering a load with a tubular envelope Download PDF

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Publication number
EP0052057B1
EP0052057B1 EP19810401773 EP81401773A EP0052057B1 EP 0052057 B1 EP0052057 B1 EP 0052057B1 EP 19810401773 EP19810401773 EP 19810401773 EP 81401773 A EP81401773 A EP 81401773A EP 0052057 B1 EP0052057 B1 EP 0052057B1
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EP
European Patent Office
Prior art keywords
tubular sheath
cutting
welding
load
anyone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19810401773
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German (de)
French (fr)
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EP0052057A1 (en
Inventor
Louis Hugon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pakem A Responsabilite Dite Ltee Ste
Original Assignee
Pakem A Responsabilite Dite Ltee Ste
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pakem A Responsabilite Dite Ltee Ste filed Critical Pakem A Responsabilite Dite Ltee Ste
Publication of EP0052057A1 publication Critical patent/EP0052057A1/en
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Publication of EP0052057B1 publication Critical patent/EP0052057B1/en
Expired legal-status Critical Current

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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
    • 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

  • the present invention relates to a method and a machine for covering a load with a tubular sheath.
  • a machine known for implementing this method comprises an internal table for receiving the load; support means for a tubular sheath coil; mobile means for gripping the free end part of the tubular sheath coming from the coil; means for guiding the gripping means in the general vertical direction; possibly manual means for moving the gripping means in the upward or downward direction, along the guide means; upper means for transverse welding of the tubular sheath.
  • the initial phase of the process consists in simultaneously opening the tubular sheath, starting with its initial free end part and unwinding the sheath coil so as to bring the initial free end part of the sheath from its original position to the right cutting means and transverse welding to its starting position in line with the load, in particular its upper face.
  • the tubular sheath is cut in a single phase, most often simultaneously with welding.
  • Known machines therefore most often comprise single cutting means placed immediately upstream of the welding means, these cutting means being suitable for making a cutting line on the tubular sheath, separating the latter. in two completely separate sections.
  • the welding means and the cutting means are generally placed on two jaws, for example a fixed jaw and a movable jaw.
  • known machines Given the need to make a clean and perfect cut of the tubular sheath, known machines generally include means for driving the fairly complex movable jaw in the form of a jack whose axis is perpendicular to the plane of travel of the tubular sheath between the two jaws, which therefore requires an appropriately shaped frame.
  • Known machines also include means for gripping in two sub-assemblies, namely a lower sub-assembly movable vertically, in the ascending or descending direction, between the upper face of the load and its lower part and a second sub-assembly placed between the transverse cutting and welding means and the first sub-assembly, with a view to bringing the tubular sheath from the cutting means associated with the welding means to the first gripping sub-assembly, while opening the tubular sheath.
  • this second subset is by nature quite sophisticated.
  • the method and the known machine generally give satisfaction, especially in the case of loads of fixed dimensions, the machine then operating at high speed and the means which compose it being mechanized and very sophisticated.
  • the present invention aims to remedy these drawbacks and for this purpose it proposes a method of the type described above in which the tubular sheath is cut in two distinct phases, ie a first partial precut phase, substantially simultaneously with the phase of welding and a second subsequent final stage of finishing or cutting proper, when the tubular sheath occupies a final position on the load.
  • the initial phase of the process is the opening of the initial free end part of the tubular sheath, without the need then simultaneously to unwind the coil of the sheath.
  • a machine of the type indicated above is according to the invention characterized in that it comprises in combination on the one hand means for precutting the tubular sheath, placed upstream of the welding means, suitable for producing on the sheath tubular a pre-cut line and on the other hand means of finishing or actual cutting of the tubular sheath, placed downstream of the welding means.
  • the tubular sheath has been pre-cut, the two sections of tubular sheath on either side of the pre-cut line are joined to each other, so that a traction exerted on one of the sections allows to train the other.
  • this precut line constitutes a line of weakening of the tubular sheath such that the subsequent cutting can then be carried out by simple pressure exerted transversely on the tubular sheath at the location or in the vicinity of the precut line.
  • This arrangement therefore makes it possible to continue to drive the tubular sheath wound on its bo storage bin, even though the transverse welding and the precut have been carried out, so that the initial extreme part of the tubular sheath can come directly in line with the vertically movable gripping means, without requiring a gripping sub-assembly placed between the welding means and the upper face of the load.
  • the welding and precut means are carried by two jaws.
  • the displacement of the movable jaw no longer requires the precision necessary in the prior art (since only a precut is made and not a complete cut) which makes it possible to facilitate the means of driving the movable jaw which can then be in the form of an inclined cylinder, which at the same time facilitates the construction of the frame of the machine and releases the upper part thereof.
  • a method and a machine are proposed for covering a load 1 with a tubular sheath 2.
  • the load 1 is for example a load carried by a pallet 3 and limited by lateral faces 4 in particular vertical and an upper face 5 in particular horizontal.
  • the tubular sheath is constituted for example by a film of heat-sealable plastic material stored flat, by virtue of the bellows of the sheath on a coil 6 of axis 6A horizontal.
  • the method and the machine aim to cover the lateral faces 4 and the upper face 5 with the tubular sheath 2.
  • the machine comprises a frame 7 extending vertically; a table 8, lower, for receiving the load 1, in particular a roller table to allow the supply of the load 1 and its evacuation when it is provided with the tubular sheath 2.
  • a table 8 lower, for receiving the load 1, in particular a roller table to allow the supply of the load 1 and its evacuation when it is provided with the tubular sheath 2.
  • To the frame 7 are fixed support means for the coil 6 such as a mandrel 6A.
  • the machine comprises thirdly gripping means 10 of the initial free end portion 11 of the tubular sheath 2 coming from the coil 6, mounted in a movable manner as will be seen later.
  • the machine comprises guide means 12 for gripping means 10 in the general vertical direction along, at the periphery and near the lateral faces 4 of the load 1.
  • the machine comprises means 13 for moving the gripping means 10 in the upward or downward direction along the guide means 12.
  • the machine also includes means 14 for transversely welding the tubular sheath 2, placed at the top of the frame 1, directly above the table 8.
  • the machine according to the invention comprises, in combination on the one hand, means for precutting 15 the tubular sheath 2, placed upstream from the welding means 14 relative to the direction of unwinding of the tubular sheath 2 from the coil 6, the precut means 15 being adapted to produce on the tubular sheath 2 a transverse precut line 16.
  • the machine comprises means of finishing or cutting proper 17 of the tubular sheath 2 placed downstream of the welding means 14.
  • FIGS. 1A to 1G The phases of the process according to the invention are illustrated in FIGS. 1A to 1G.
  • the initial extreme part 11 of the sheath 2 is opened, the coil 6 is unwound. Simultaneously, it is engaged progressively, by its initial free end part 11 around the load 2, in particular from its face. upper 5.
  • a cut and a transverse welding of the tubular sheath 2 are carried out.
  • the tubular sheath is cut in two distinct phases, ie a first phase (fig. 1 C) of partial precutting substantially simultaneously with the welding phase and a second final phase (fig. 1 E) subsequent to finishing or cutting proper when the tubular sheath 2 occupies its final position on the load 1.
  • a first phase fig. 1 C
  • a second final phase fig. 1 E
  • This phase is continued, which corresponds to a vertical downward movement of the tubular sheath 2 until the length of the tubular sheath between the initial free end portion 11 and the welding means 14 corresponds to the length of tubular sheath 2 necessary to cover the load 1, in particular its lateral faces 4 and its upper face 5.
  • This length corresponds for example substantially to the height of the load 1 and to the half width of the upper face 5.
  • the welding means 14 are then actuated which make a transverse welding line 18 on the tubular sheath 2.
  • the precut line 16 is produced upstream and preferably in the immediate vicinity of the weld line 18 (FIG. 1C).
  • tubular sheath parts on either side of the precut lines 16 and welding 18 are associated with each other.
  • the load 1 provided with its sheath 2 can then be removed (fig. 1 F).
  • the new initial end portion 11 of the tubular sheath 1 is then opened, without having to unwind the coil 6 or to scroll the tubular sheath 2 opposite the welding means 14 and precut 15.
  • the finishing and cutting phase itself can be carried out manually.
  • the actual finishing and cutting phase can be carried out by simple transverse pressure on the tubular sheath right or in the vicinity of the pre-cut line 16.
  • the precut means 15 are located in the immediate vicinity of the welding means 14.
  • the finishing means 17 can be manual. They are separated from the welding means 14 downstream, in particular located in the vicinity of the upper face 5 of the load 1 which has just been covered with a sheath.
  • the finishing means 17 can be in the form of a horizontal bar, parallel to the plane of travel of the tubular sheath 2, the section being obtained by simple transverse pressure of this bar on the tubular sheath 2 at the place or at the neighborhood of the precut line 16.
  • finishing means 17 are adjustable, being mounted to slide on vertical guide means, so that they can be placed at the desired location, depending on the position of the pre-cut line 16 , which itself depends on the height of the load 1.
  • finishing means 17 is within the scope of the invention.
  • the machine may not actually include integrated finishing means 17, the finishing phase being carried out by the outside operator, by means of an appropriate cutting or similar tool.
  • the gripping means 10, the guiding means 12, the means 13 can be the subject of numerous variant embodiments which all come within the scope of the invention.
  • the guide means 12 and the means 13 are merged and constituted for example by endless chains stretched between sprockets 19 placed at the upper part and at the lower part of the frame 7, these endless chains being driven by a motor or possibly manually by a handle.
  • these endless chains have a return 20 whose direction of movement is reversed relative to the direction of movement of the gripping means 10 associated with the endless chains, a handle 21 being fixed to the return 20 to allow its movement, this handle 20 moving opposite a graduation 22 making it possible to indicate the necessary displacement stroke of the handle 21 for a given load height.
  • the handle 21 is placed at the lower part of the frame 7 when the gripping means 10 are placed at the upper part of the frame as illustrated in FIG. 2.
  • the guide means 12 being for example slides
  • the means 13 being for example worms, cables, etc.
  • the gripping means 10 are movable from an initial position (that shown in FIGS. 1A, 1F, 1G, 2, 3) separated from the welding means 14 and precut 15 without the need to interpose between this initial position of said means and the welding means 14 and precut 15 of the means for driving the tubular sheath 2.
  • the welding 14 and precut 15 means are preferably placed on two jaws, ie a fixed jaw 23, carried by the frame 7 and a movable jaw 24, opposite the fixed jaw 23.
  • the jaws 23, 24 are interposed between an upstream deflection roller 25 and two downstream rollers 26 in the immediate vicinity of one another.
  • the movable jaw 24 is moved by a drive member 27 in the form of a jack articulated by its head 28 to the movable jaw 24 around an axis 29 and by its body 30 to the frame 7 around an axis 31.
  • the jack 27 is tilted up and down between the body 30 and the head 28.
  • the movable jaw 24 is fixed to a link 32 articulated around an axis 33 placed above and vertically of the two jaws 23, 24.
  • the fixed jaw 23 and movable jaw 24 have at their lower part the welding means 14 such as heating means including an electrical resistance.
  • the precut means 15 comprising, on one of the jaws, in particular the movable jaw 24, a precut blade 34 cooperating with a cavity 35 formed in the fixed jaw 23, opposite, of sufficient depth.
  • the blade 34 has a sharp edge with teeth which allows to make the pre-cut line 16.
  • the jaws 23, 24 are associated, upstream, with means 36 preventing any untimely upward movement of the sheath 2.
  • These means 36 may include a stop 37 fixed to the fixed jaw 23 on its upper face, to which is applied a bar 38, urged towards the stop 37 by an elastic member 39 such as a helical spring.
  • the bar 38 is coated with an anti-slip material such as a rubber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

La présente invention concerne un procédé et une machine pour recouvrir une charge d'une gaine tubulaire.The present invention relates to a method and a machine for covering a load with a tubular sheath.

On connaît déjà notamment par le document US-A-3 738 079 un procédé pour recouvrir une charge d'une gaine tubulaire dans lequel on ouvre la partie extrême initiale de la gaine tubulaire; on dévide une bobine sur laquelle est enroulée la gaine tubulaire; on engage progressivement la gaine tubulaire par sa partie extrême initiale autour de la charge notamment par sa partie supérieure; on effectue une coupe et un soudage transversal de la gaine tubulaire.Already known in particular from document US-A-3 738 079 a method for covering a load with a tubular sheath in which the initial end part of the tubular sheath is opened; a reel is unwound on which the tubular sheath is wound; the tubular sheath is gradually engaged by its initial end part around the load, in particular by its upper part; a cut and a transverse welding of the tubular sheath are carried out.

Une machine connue pour la mise en oeuvre de ce procédé comprend une table intérieure de réception de la charge; des moyens supports pour une bobine de gaine tubulaire; des moyens mobiles de saisie de la partie extrême libre de la gaine tubulaire provenant de la bobine; des moyens de guidage des moyens de saisie dans la direction générale verticale; des moyens éventuellement manuels pour déplacer les moyens de saisie dans le sens ascendant ou descendant, le long des moyens de guidage; des moyens supérieurs de soudage transversal de la gaine tubulaire.A machine known for implementing this method comprises an internal table for receiving the load; support means for a tubular sheath coil; mobile means for gripping the free end part of the tubular sheath coming from the coil; means for guiding the gripping means in the general vertical direction; possibly manual means for moving the gripping means in the upward or downward direction, along the guide means; upper means for transverse welding of the tubular sheath.

La mise en oeuvre de ce procédé connu au moyen de cette machine également connue permet de recouvrir les faces verticales et la face supérieure d'une charge notamment une charge palettisée, au moyen d'une gaine tubulaire constituée notamment par un film en matière plastique thermosoudable.The implementation of this known method by means of this also known machine makes it possible to cover the vertical faces and the upper face of a load, in particular a palletized load, by means of a tubular sheath constituted in particular by a film of heat-sealable plastic material. .

Le plus souvent, la phase initiale du procédé consiste à simultanément ouvrir la gaine tubulaire, en commençant par sa partie extrême libre initiale et à dévider la bobine de gaine de manière à amener la partie extrême libre initiale de la gaine de sa position originelle au droit des moyens de coupe et soudage transversal jusqu'à sa position de départ au droit de la charge notamment sa face supérieure. Par ailleurs, dans ce procédé connu, on réalise la coupe de la gaine tubulaire en une phase unique le plus souvent simultanément au soudage.Most often, the initial phase of the process consists in simultaneously opening the tubular sheath, starting with its initial free end part and unwinding the sheath coil so as to bring the initial free end part of the sheath from its original position to the right cutting means and transverse welding to its starting position in line with the load, in particular its upper face. Furthermore, in this known process, the tubular sheath is cut in a single phase, most often simultaneously with welding.

Les machines connues, du type indiqué plus haut, comportent donc le plus souvent des moyensuniques de coupe placés immédiatement à l'amont des moyens de soudage, ces moyens de coupe étant propres à réaliser une ligne de coupe sur la gaine tubulaire, séparant celle-ci en deux tronçons totalement distincts. Les moyens de soudage et les moyens de coupe sont généralement placés sur deux mors, par exemple un mors fixe et un mors mobile. Compte tenu de la nécessité de réaliser une coupe franche et parfaite de la gaine tubulaire, les machines connues comportent généralement des moyens d'entraînement du mors mobile assez complexe sous la forme d'un vérin dont l'axe est perpendiculaire au plan de défilément de la gaine tubulaire entre les deux mors, ce qui impose donc un bâti de forme appropriée. Les machines connues comportent encore des moyens de saisie en deux sous-ensemble à savoir un sous-ensemble inférieur mobile verticalement, dans le sens ascendant ou descendant, entre la face supérieure de la charge et sa partie inférieure et un second sous-ensemble placé entre les moyens de coupe et soudage transversal et le premier sous-ensemble, en vue d'amener la gaine tubulaire depuis les moyens de coupe associés aux moyens de soudage jusqu'au premier sous-ensemble de saisie, tout en ouvrant la gaine tubulaire. Il est clair que ce second sous-ensemble est par nature assez sophistiqué.Known machines, of the type indicated above, therefore most often comprise single cutting means placed immediately upstream of the welding means, these cutting means being suitable for making a cutting line on the tubular sheath, separating the latter. in two completely separate sections. The welding means and the cutting means are generally placed on two jaws, for example a fixed jaw and a movable jaw. Given the need to make a clean and perfect cut of the tubular sheath, known machines generally include means for driving the fairly complex movable jaw in the form of a jack whose axis is perpendicular to the plane of travel of the tubular sheath between the two jaws, which therefore requires an appropriately shaped frame. Known machines also include means for gripping in two sub-assemblies, namely a lower sub-assembly movable vertically, in the ascending or descending direction, between the upper face of the load and its lower part and a second sub-assembly placed between the transverse cutting and welding means and the first sub-assembly, with a view to bringing the tubular sheath from the cutting means associated with the welding means to the first gripping sub-assembly, while opening the tubular sheath. It is clear that this second subset is by nature quite sophisticated.

Le procédé et la machine connue donnent généralement satisfaction tout spécialement dans le cas de charges de dimensions fixes, la machine fonctionnant alors à vitesse élevée et les moyens qui la compose étant mécanisés et très sophistiqués.The method and the known machine generally give satisfaction, especially in the case of loads of fixed dimensions, the machine then operating at high speed and the means which compose it being mechanized and very sophisticated.

Toutefois, il apparaît qu'un tel procédé et une telle machine sont peu adaptés au cas de charges de dimension variable ou pour des vitesses de fonctionnement plus faibles ou lorsque l'on souhaite une machine moins sophistiquée, moins coûteuse, en particulier supportant d'être commandée partiellement manuellement.However, it appears that such a method and such a machine are ill suited to the case of loads of variable size or for lower operating speeds or when a less sophisticated, less expensive machine is desired, in particular supporting be partially controlled manually.

La présente invention vise à remédier à ces inconvénients et à cet effet elle propose un procédé du type décrit plus haut dans lequel on réalise la coupe de la gaine tubulaire en deux phases distinctes soit une première phase de prédécoupe partielle, sensiblement simultanément à la phase de soudage et une seconde phase finale ultérieure de finition ou coupe proprement dite, lorsque la gaine tubulaire occupe une position définitive sur la charge.The present invention aims to remedy these drawbacks and for this purpose it proposes a method of the type described above in which the tubular sheath is cut in two distinct phases, ie a first partial precut phase, substantially simultaneously with the phase of welding and a second subsequent final stage of finishing or cutting proper, when the tubular sheath occupies a final position on the load.

Suivant les autres caractéristiques du procédé suivant l'invention, la phase initiale du procédé est l'ouverture de la partie extrême libre initiale de la gaine tubulaire, sans nécessité alors simultanément de dévider la bobine de la gaine.According to the other characteristics of the process according to the invention, the initial phase of the process is the opening of the initial free end part of the tubular sheath, without the need then simultaneously to unwind the coil of the sheath.

Une machine du type indiqué précédemment est suivant l'invention caractérisée par le fait qu'elle comporte en combinaison d'une part des moyens de prédécoupe de la gaine tubulaire, placée à l'amont des moyens de soudage, propres à réaliser sur la gaine tubulaire une ligne de prédécoupe et d'autre part des moyens de finition ou coupe proprement dite de la gaine tubulaire, placés à l'aval des moyens de soudage. Lorsque la gaine tubulaire a été prédécoupée, les deux tronçons de gaine tubulaire de part et d'autre de la ligne de prédécoupe sont solidarisés l'un à l'autre, de telle manière qu'une traction exercée sur l'un des tronçons permette d'entraîner l'autre. Toutefois, cette ligne de prédécoupe constitue une ligne d'affaiblissement de la gaine tubulaire telle que la coupe ultérieure peut être ensuite réalisée par simple pression exercée transversalement sur la gaine tubulaire à l'endroit ou au voisinage de la ligne de prédécoupe.A machine of the type indicated above is according to the invention characterized in that it comprises in combination on the one hand means for precutting the tubular sheath, placed upstream of the welding means, suitable for producing on the sheath tubular a pre-cut line and on the other hand means of finishing or actual cutting of the tubular sheath, placed downstream of the welding means. When the tubular sheath has been pre-cut, the two sections of tubular sheath on either side of the pre-cut line are joined to each other, so that a traction exerted on one of the sections allows to train the other. However, this precut line constitutes a line of weakening of the tubular sheath such that the subsequent cutting can then be carried out by simple pressure exerted transversely on the tubular sheath at the location or in the vicinity of the precut line.

Cette disposition permet donc de continuer à entraîner la gaine tubulaire enroulée sur sa bobine de stockage, alors même que le soudage transversal et la prédécoupe ont été réalisés, de sorte que la partie extrême initiale de la gaine tubulaire peut venir directement au droit des moyens de saisie mobiles verticalement, sans nécessiter un sous-ensemble de saisie placé entre les moyens de soudage et la face supérieure de la charge. Les moyens de soudage et de prédécoupe sont portés par deux mors. Cependant, le déplacement du mors mobile ne requiert plus la précision nécessaire dans l'état antérieur de la technique (puisque l'on réalise seulement une prédécoupe et non une coupe complète) ce qui permet de faciliter les moyens d'entraînement du mors mobile pouvant alors se présenter sous la forme d'un vérin incliné, ce qui tout à la fois facilite la construction du bâti de la machine et dégage la partie supérieure de celle-ci.This arrangement therefore makes it possible to continue to drive the tubular sheath wound on its bo storage bin, even though the transverse welding and the precut have been carried out, so that the initial extreme part of the tubular sheath can come directly in line with the vertically movable gripping means, without requiring a gripping sub-assembly placed between the welding means and the upper face of the load. The welding and precut means are carried by two jaws. However, the displacement of the movable jaw no longer requires the precision necessary in the prior art (since only a precut is made and not a complete cut) which makes it possible to facilitate the means of driving the movable jaw which can then be in the form of an inclined cylinder, which at the same time facilitates the construction of the frame of the machine and releases the upper part thereof.

Les autres caractéristiques de l'invention résulteront de la description qui suivra en référence aux dessins annexés dans lesquels:

  • Les fig. 1A, 1 B, 1 C, 1 D, 1 E, 1 F et 1G sont sept vues schématiques, en élévation, illustrant les phases successives du procédé suivant l'invention.
  • Les fig. 2 et 3 sont deux vues schématiques respectivement en élévation et de côté illustrant une machine pour la mise en oeuvre du procédé;
  • la fig. 4 est une vue schématique, partielle, à plus grande échelle, des moyens de soudage et de prédécoupe de la machine suivant l'invention;
  • la fig. 5 est une vue schématique, en élévation partielle, des moyens de prédécoupe.
The other characteristics of the invention will result from the description which follows with reference to the accompanying drawings in which:
  • Figs. 1A, 1 B, 1 C, 1 D, 1 E, 1 F and 1G are seven schematic views, in elevation, illustrating the successive phases of the process according to the invention.
  • Figs. 2 and 3 are two schematic views in elevation and side view respectively illustrating a machine for implementing the method;
  • fig. 4 is a schematic, partial view, on a larger scale, of the welding and precut means of the machine according to the invention;
  • fig. 5 is a schematic view, in partial elevation, of the precut means.

Suivant l'invention, il est proposé un procédé et une machine pour recouvrir une charge 1 d'une gaine tubulaire 2.According to the invention, a method and a machine are proposed for covering a load 1 with a tubular sheath 2.

La charge 1 est par exemple une charge portée par une palette 3 et limitée par des faces latérales 4 notamment verticales et une face supérieure 5 notamment horizontale.The load 1 is for example a load carried by a pallet 3 and limited by lateral faces 4 in particular vertical and an upper face 5 in particular horizontal.

La gaine tubulaire est constituée par exemple par un film en matière plastique thermosoudable stocké à plat, grâce aux soufflets de la gaine sur une bobine 6 d'axe 6A horizontal.The tubular sheath is constituted for example by a film of heat-sealable plastic material stored flat, by virtue of the bellows of the sheath on a coil 6 of axis 6A horizontal.

Le procédé et la machine visent à recouvrir les faces latérales 4 et la face supérieure 5 avec la gaine tubulaire 2.The method and the machine aim to cover the lateral faces 4 and the upper face 5 with the tubular sheath 2.

La machine suivant l'invention comporte un bâti 7 s'étendant verticalement; une table 8, inférieure, de réception de la charge 1, notamment une table à rouleaux pour permettre l'amenée de la charge 1 et son évacuation lorsqu'elle est pourvue de la gaine tubulaire 2. Au bâti 7 sont fixés des moyens supports pour la bobine 6 tel qu'un mandrin 6A.The machine according to the invention comprises a frame 7 extending vertically; a table 8, lower, for receiving the load 1, in particular a roller table to allow the supply of the load 1 and its evacuation when it is provided with the tubular sheath 2. To the frame 7 are fixed support means for the coil 6 such as a mandrel 6A.

La machine comporte en troisième lieu des moyens de saisie 10 de la partie extrême libre initiale 11 de la gaine tubulaire 2 provenant de la bobine 6, montés de façon mobile comme on le verra ultérieurement.The machine comprises thirdly gripping means 10 of the initial free end portion 11 of the tubular sheath 2 coming from the coil 6, mounted in a movable manner as will be seen later.

La machine comporte des moyens de guidage 12 des moyens de saisie 10 dans la direction générale verticale le long, à la périphérie et à proximité des faces latérales 4 de la charge 1.The machine comprises guide means 12 for gripping means 10 in the general vertical direction along, at the periphery and near the lateral faces 4 of the load 1.

La machine comporte des moyens 13 pour déplacer les moyens de saisie 10 dans le sens ascendant ou descendant le long des moyens de guidage 12.The machine comprises means 13 for moving the gripping means 10 in the upward or downward direction along the guide means 12.

La machine comporte également des moyens 14 de soudage transversal de la gaine tubulaire 2, placés à la partie supérieure du bâti 1, à l'aplomb de la table 8.The machine also includes means 14 for transversely welding the tubular sheath 2, placed at the top of the frame 1, directly above the table 8.

La machine suivant l'invention comporte en combinaison d'une part des moyens de prédécoupe 15 de la gaine tubulaire 2, placés à l'amont des moyens de soudage 14 par rapport au sens de dévidement de la gaine tubulaire 2 depuis la bobine 6, les moyens de prédécoupe 15 étant propres à réaliser sur la gaine tubulaire 2 une ligne transversale de prédécoupe 16. D'autre part, la machine comporte des moyens de finition ou de coupe proprement dite 17 de la gaine tubulaire 2 placés à l'aval des moyens de soudage 14.The machine according to the invention comprises, in combination on the one hand, means for precutting 15 the tubular sheath 2, placed upstream from the welding means 14 relative to the direction of unwinding of the tubular sheath 2 from the coil 6, the precut means 15 being adapted to produce on the tubular sheath 2 a transverse precut line 16. On the other hand, the machine comprises means of finishing or cutting proper 17 of the tubular sheath 2 placed downstream of the welding means 14.

Les phases du procédé selon l'invention sont illustrées par les fig. 1A à 1G. D'une façon générale, on ouvre la partié extrême initiale 11 de la gaine 2, on dévide la bobine 6. Simultanément, on l'engage progressivement, par sa partie extrême libre initiale 11 autour de la charge 2 notamment à partir de sa face supérieure 5. On effectue une coupe et un soudage transversal de la gaine tubulaire 2.The phases of the process according to the invention are illustrated in FIGS. 1A to 1G. Generally, the initial extreme part 11 of the sheath 2 is opened, the coil 6 is unwound. Simultaneously, it is engaged progressively, by its initial free end part 11 around the load 2, in particular from its face. upper 5. A cut and a transverse welding of the tubular sheath 2 are carried out.

Suivant l'invention, on réalise la coupe de la gaine tubulaire en deux phases distinctes soit une première phase (fig. 1 C) de prédécoupe partielle sensiblement simultanément à la phase de soudage et une seconde phase (fig. 1 E) finale ultérieure de finition ou coupe proprement dite lorsque la gaine tubulaire 2 occupe sa position définitive sur la charge 1.According to the invention, the tubular sheath is cut in two distinct phases, ie a first phase (fig. 1 C) of partial precutting substantially simultaneously with the welding phase and a second final phase (fig. 1 E) subsequent to finishing or cutting proper when the tubular sheath 2 occupies its final position on the load 1.

Initialement (fig. 1A) la partie extrême libre initiale 11 de la gaine 2 est à l'état ouvert et placée en regard, à l'aplomb, notamment immédiatement au dessus de la face supérieure 5 de la charge.Initially (FIG. 1A) the initial free end portion 11 of the sheath 2 is in the open state and placed facing, vertically, especially immediately above the upper face 5 of the load.

Ultérieurement, on dévide la gaine tubulaire 2 de la bobine 6 et on recouvre progressivement les faces latérales 4 de la charge 1, à partir de la face supérieure 5 (fig. 1 B).Subsequently, the tubular sheath 2 of the reel 6 is unwound and the lateral faces 4 of the load 1 are progressively covered, starting from the upper face 5 (fig. 1 B).

On poursuit cette phase, qui correspond à un mouvement vertical descendant de la gaine tubulaire 2 jusqu'à ce que la longueur de la gaine tubulaire comprise entre la partie extrême libre initiale 11 et les moyens de soudage 14 correspond à la longueur de gaine tubulaire 2 nécessaire pour recouvrir la charge 1 notamment ses faces latérales 4 et sa face supérieure 5. Cette longueur correspond par exemple sensiblement à la hauteur de la charge 1 et à la demi largeur de la face supérieure 5. On actionne alors les moyens de soudage 14 qui réalisent sur la gaine tubulaire 2 une ligne de soudage transversale 18.This phase is continued, which corresponds to a vertical downward movement of the tubular sheath 2 until the length of the tubular sheath between the initial free end portion 11 and the welding means 14 corresponds to the length of tubular sheath 2 necessary to cover the load 1, in particular its lateral faces 4 and its upper face 5. This length corresponds for example substantially to the height of the load 1 and to the half width of the upper face 5. The welding means 14 are then actuated which make a transverse welding line 18 on the tubular sheath 2.

Simultanément ou non, notamment ultérieurement, on réalise la ligne de prédécoupe 16 à l'amont et préférentiellement au voisinage immédiat de la ligne de soudage 18 (fig. 1 C).Simultaneously or not, in particular subsequently, the precut line 16 is produced upstream and preferably in the immediate vicinity of the weld line 18 (FIG. 1C).

Dans cette situation, les parties de gaine tubulaire de part et d'autre des lignes de prédécoupe 16 et de soudage 18 sont associées l'une à l'autre.In this situation, the tubular sheath parts on either side of the precut lines 16 and welding 18 are associated with each other.

Ultérieurement (fig. 1 D) on continue à dévider la bobine 6 et simultanément à recouvrir la charge 1 avec la gaine 2 jusqu'à ce que la charge 1 soit totalement recouverte, comme indiqué plus haut, et donc que la ligne de soudage 18 soit notamment appliquée ou proche de la face supérieure 5.Subsequently (fig. 1 D) we continue to unwind the coil 6 and simultaneously cover the load 1 with the sheath 2 until the load 1 is completely covered, as indicated above, and therefore that the welding line 18 either in particular applied or close to the upper face 5.

Ultérieurement, on procède à la phase finale de coupe proprement dite qui intervient à l'endroit de la ligne de prédécoupe 16. Apparaît alors une nouvelle partie extrême libre initiale 11 située alors au voisinage immédiat de la charge 1 notamment la face supérieure 5 et écartée vers le bas des moyens de soudage 15 et des moyens de prédécoupe 15.Subsequently, the final cutting phase proper takes place which takes place at the location of the precut line 16. A new initial free end portion 11 then appears, located then in the immediate vicinity of the load 1, in particular the upper face 5 and separated downward welding means 15 and precut means 15.

La charge 1 pourvue de sa gaine 2 peut être alors évacuée (fig. 1 F).The load 1 provided with its sheath 2 can then be removed (fig. 1 F).

On réalise alors l'ouverture de la nouvelle partie extrême initiale 11 de gaine tubulaire 1, sans avoir à dévider la bobine 6 ou à faire défiler la gaine tubulaire 2 en regard des moyens de soudage 14 et de prédécoupe 15.The new initial end portion 11 of the tubular sheath 1 is then opened, without having to unwind the coil 6 or to scroll the tubular sheath 2 opposite the welding means 14 and precut 15.

Suivant l'invention, on peut réaliser la phase de finition et de coupe proprement dite manuellement.According to the invention, the finishing and cutting phase itself can be carried out manually.

On peut réaliser la phase de finition et de coupe proprement dite par simple pression transversale sur la gaine tubulaire au droit ou au voisinage de la ligne de prédécoupe 16.The actual finishing and cutting phase can be carried out by simple transverse pressure on the tubular sheath right or in the vicinity of the pre-cut line 16.

Dans la machine suivant l'invention, les moyens de prédécoupe 15 sont situés au voisinage immédiat des moyens de soudage 14.In the machine according to the invention, the precut means 15 are located in the immediate vicinity of the welding means 14.

Egalement, suivant l'invention, les moyens de finition 17 peuvent être manuels. Ils sont écartés des moyens de soudage 14 vers l'aval notamment situés au voisinage de la face supérieure 5 de la charge 1 qui vient d'être recouverte de gaine.Also, according to the invention, the finishing means 17 can be manual. They are separated from the welding means 14 downstream, in particular located in the vicinity of the upper face 5 of the load 1 which has just been covered with a sheath.

Les moyens de finition 17 peuvent se présenter sous la forme d'une barre horizontale, parallèle au plan de défilement de la gaine tubulaire 2, la coupe étant obtenue par simple pression transversale de cette barre sur la gaine tubulaire 2 à l'endroit ou au voisinage de la ligne de prédécoupe 16.The finishing means 17 can be in the form of a horizontal bar, parallel to the plane of travel of the tubular sheath 2, the section being obtained by simple transverse pressure of this bar on the tubular sheath 2 at the place or at the neighborhood of the precut line 16.

Dans une variante possible, non représentée, les moyens de finition 17 sont réglables, étant montés à coulissement sur des moyens de guidage verticaux, de manière à pouvoir être placés à l'endroit souhaité, en fonction de la position de la ligne de prédécoupe 16, dépendant elle-même de la hauteur de la charge 1.In a possible variant, not shown, the finishing means 17 are adjustable, being mounted to slide on vertical guide means, so that they can be placed at the desired location, depending on the position of the pre-cut line 16 , which itself depends on the height of the load 1.

Il est clair que toute autre forme de moyens de finition 17 entre dans le cadre de l'invention. En particulier, la machine peut ne pas comporter véritablement de moyens de finition 17 intégrés, la phase de finition étant réalisée par l'opérateur extérieur, au moyen d'un outil tranchant ou similaire approprié.It is clear that any other form of finishing means 17 is within the scope of the invention. In particular, the machine may not actually include integrated finishing means 17, the finishing phase being carried out by the outside operator, by means of an appropriate cutting or similar tool.

Les moyens de saisie 10, les moyens de guidage 12, les moyens 13 peuvent faire l'objet de nombreuses variantes d'exécution qui entrent toutes dans le cadre de l'invention.The gripping means 10, the guiding means 12, the means 13 can be the subject of numerous variant embodiments which all come within the scope of the invention.

Selon une variante possible, les moyens de guidage 12 et les moyens 13 sont confondus et constitués par exemple par des chaînes sans fin tendues entre des pignons 19 placés à la partie supérieure et à la partie inférieure du bâti 7, ces chaînes sans fin étant entraînées par un moteur ou éventuellement manuellement par une poignée. Dans une forme de réalisation illustrée par les fig. 2 et 3, ces chaînes sans fin comportent un retour 20 dont le sens de déplacement est inversé par rapport au sens de déplacement des moyens de saisie 10 associés aux chaines sans fin, une poignée 21 étant fixée au retour 20 pour permettre son déplacement, cette poignée 20 se déplaçant en regard d'une graduation 22 permettant d'indiquer la course de déplacement nécessaire de la poignée 21 pour une hauteur de charge donnée. Dans ce cas, la poignée 21 est placée à la partie inférieure du bâti 7 lorsque les moyens de saisie 10 sont placés à la partie supérieure du bâti comme illustré par la fig. 2.According to a possible variant, the guide means 12 and the means 13 are merged and constituted for example by endless chains stretched between sprockets 19 placed at the upper part and at the lower part of the frame 7, these endless chains being driven by a motor or possibly manually by a handle. In an embodiment illustrated in FIGS. 2 and 3, these endless chains have a return 20 whose direction of movement is reversed relative to the direction of movement of the gripping means 10 associated with the endless chains, a handle 21 being fixed to the return 20 to allow its movement, this handle 20 moving opposite a graduation 22 making it possible to indicate the necessary displacement stroke of the handle 21 for a given load height. In this case, the handle 21 is placed at the lower part of the frame 7 when the gripping means 10 are placed at the upper part of the frame as illustrated in FIG. 2.

Il va de soi cependant que toute autre forme d'exécution est possible, les moyens de guidage 12 étant par exemple des glissières, les moyens 13 étant par exemple des vis sans fin, des câbles, etc.It goes without saying, however, that any other embodiment is possible, the guide means 12 being for example slides, the means 13 being for example worms, cables, etc.

On constate que dans la machine suivant l'invention, les moyens de saisie 10 sont mobiles à partir d'une position initiale (celle représentée sur les fig. 1A, 1F, 1G, 2, 3) écartée des moyens de soudage 14 et prédécoupe 15 sans nécessité d'interposer entre cette position initiale desdits moyens et les moyens de soudage 14 et de prédécoupe 15 des moyens d'entraînement de la gaine tubulaire 2.It can be seen that in the machine according to the invention, the gripping means 10 are movable from an initial position (that shown in FIGS. 1A, 1F, 1G, 2, 3) separated from the welding means 14 and precut 15 without the need to interpose between this initial position of said means and the welding means 14 and precut 15 of the means for driving the tubular sheath 2.

Les moyens de soudage 14 et de prédécoupe 15 sont préférentiellement placés sur deux mors soit un mors fixe 23, porté par le bâti 7 et un mors mobile 24, en regard du mors fixe 23.The welding 14 and precut 15 means are preferably placed on two jaws, ie a fixed jaw 23, carried by the frame 7 and a movable jaw 24, opposite the fixed jaw 23.

Préférentiellement, les mors 23, 24 sont intercalés entre un rouleau de renvoi amont 25 et deux rouleaux aval 26 au voisinage immédiat l'un de l'autre.Preferably, the jaws 23, 24 are interposed between an upstream deflection roller 25 and two downstream rollers 26 in the immediate vicinity of one another.

Le mors mobile 24 est déplacé par un organe d'entraînement 27 se présentant sous la forme d'un vérin articulé par sa tête 28 au mors mobile 24 autour d'un axe 29 et par son corps 30 au bâti 7 autour d'un axe 31. Suivant l'invention, le vérin 27 est incliné de haut en bas entre le corps 30 et la tête 28. Le mors mobile 24 est fixé à une biellette 32 articulée autour d'un axe 33 placé au dessus et à l'aplomb des deux mors 23, 24.The movable jaw 24 is moved by a drive member 27 in the form of a jack articulated by its head 28 to the movable jaw 24 around an axis 29 and by its body 30 to the frame 7 around an axis 31. According to the invention, the jack 27 is tilted up and down between the body 30 and the head 28. The movable jaw 24 is fixed to a link 32 articulated around an axis 33 placed above and vertically of the two jaws 23, 24.

Dans cette forme de réalisation, les mors fixe 23 et mobile 24 comportent à leur partie inférieure les moyens de soudage 14 tel que des moyens de chauffage notamment une résistance électrique. Immédiatement placés au dessus, dans la partie médiane des mors, sont les moyens de prédécoupe 15 comportant sur l'un des mors notamment le mors mobile 24 une lame de prédécoupe 34 coopérant avec une cavité 35 ménagée dans le mors fixe 23, en regard, de profondeur suffisamment importante.In this embodiment, the fixed jaw 23 and movable jaw 24 have at their lower part the welding means 14 such as heating means including an electrical resistance. Immediately placed above, in the middle part of the jaws, are the precut means 15 comprising, on one of the jaws, in particular the movable jaw 24, a precut blade 34 cooperating with a cavity 35 formed in the fixed jaw 23, opposite, of sufficient depth.

Comme illustrée par la fig. 5, la lame 34 a un bord tranchant pouvu de denture ce qui permet de réaliser la ligne de prédécoupe 16.As illustrated in fig. 5, the blade 34 has a sharp edge with teeth which allows to make the pre-cut line 16.

Aux mors 23, 24 est associé, à l'amont, des moyens 36 évitant tout mouvement ascendant intempestif de la gaine 2. Ces moyens 36 peuvent comporter une butée 37 fixée au mors fixe 23 sur sa face supérieure, sur laquelle vient être appliquée une barre 38, sollicitée en direction de la butée 37 par un organe élastique 39 tel qu'un ressort hélicoïdal. Préférentiellement, la barre 38 est revêtue d'un matériau anti-glissant tel qu'un caoutchouc.The jaws 23, 24 are associated, upstream, with means 36 preventing any untimely upward movement of the sheath 2. These means 36 may include a stop 37 fixed to the fixed jaw 23 on its upper face, to which is applied a bar 38, urged towards the stop 37 by an elastic member 39 such as a helical spring. Preferably, the bar 38 is coated with an anti-slip material such as a rubber.

Il va de soi que l'invention peut faire l'objet de nombreuses autres variantes et formes d'exécution.It goes without saying that the invention can be the subject of numerous other variants and embodiments.

Claims (15)

1. Method for covering a load (1) with a tubular sheath (2) comprising the steps of: opening the initial end portion (11) of the sheath (2), unwinding a coil (6) on which the tubular sheath (2) is wounded, progressively engaging the tubular sheath (2), by its initial end portion (11) around the load and starting notably from the upper part (5) thereof, cutting and welding transversely the sheath, characterized in that the cutting of the tubular sheath (2) is effected in two distinct phases, namely:
- a first partial pre-cutting phase, substantially simultaneously with the welding phase; and
- a second subsequent final finishing phase, also termed »actual cutting phase«, once the tubular sheath (2) occupies its final position around the load.
2. Method according to claim 1, characterized in that the first pre-cutting first phase is effected when the tubular sheath (2) is only partially engaged around the load.
3. Method according to either claim 1 or 2, characterized in that the finishing phase is effected manually.
4. Method according to anyone of claims 1, 2, 3, characterized in that the finishing phase is effected by merely applying a transverse thrust onto the tubular sheath (2) at or in the vicinity of the pre-cutting line (16).
5. Method according to anyone of claims 1, 2, 4, characterized in that its starting phase consists of the opening of the initial end portion (11) of the tubular sheath (2), without need to unwind the coil (6).
6. Apparatus for covering a load (1) with a tubular sheath (2), comprising a lower table (8) for receiving the load (1), support means (6) for supporting a coil (6) of tubular sheath, displaceable gripping means (10) for gripping the initial end portion (11) of the tubular sheath (2) unwound from the coil (6), vertically oriented guide means (12) for guiding the gripping means (10), drive means (13) which may be manually operated, for displacing the gripping means (10) up and down along the guide means (12), and upper welding means (14) for effecting a transverse weld on the tubular sheath (2), characterized in that it comprises, in combination:
- means (15) for pre-cutting the tubular sheath (2) and located upstream the welding means (14), adapted for effecting a transverse pre-cutting line (16) onto the tubular sheath (2), and
- finishing means, also termed »actual cutting means« (17) of the tubular sheath (2), located downstream the welding means (14).
7. Apparatus according to claim 6, characterized in that the pre-cutting means (15) are located immediately upstream the welding means (14), the entire set having the form of two jaws, one fixed (23) and one displaceable (24), the finishing means (17) being spaced from the welding means (14) and downstream thereof.
8. Apparatus according to either claim 6 and 7, characterized in that the finishing means (17) are manually operated.
9. Apparatus according to anyone of claims 6 to 8, characterized in that the finishing means (17) are adjustably mounted with vertical sliding.
10. Apparatus according to anyone of claims 6 to 9, characterized in that the finishing means (17) by exerting a mere transverse thrust thereon.
11. Apparatus according to anyone of claims 6 to 10, characterized in that the gripping means (10) are displaceable from an initial position spaced from and downstream of the welding means (14), there being no driving device for the tubular sheath (2) between the welding means (14) and the initial position of the gripping means (10).
12. Apparatus according to anyone of claims 6 to 11, characterized in that the guide means (12) and the drive means (13) for displacing are common.
13. Apparatus according to anyone of claims 6 to 12, characterized in that the pre-cutting means (15) comprise a blade (34) supported by a jaw (24) cooperating with a recess (35) provided in the other jaw (23).
14. Apparatus according to anyone of claims 6 to 13, characterized in that the displaceable jaw (24) is driven by a driving device in the form of a jack slanted in such a manner that its body (30) is oriented upwardly and its head (28) downwardly, the displaceable jaw (24) being secured to a lever (32) hinged around an axis (33) located over the two jaws (23, 24) and at the vertical thereof.
15. Apparatus according to anyone of claims 6 to 14, characterized in that it comprises means (36) for preventing any undesirable displacement of the tubular sheath (2) upwardly, such as an abutment (37) associated with the fixed jaw (23) and cooperating with a bar (38) biassed towards the abutment (37) by a resilient member (39), the bar (38) being preferably covered with an antislip material.
EP19810401773 1980-11-07 1981-11-06 Method and apparatus for covering a load with a tubular envelope Expired EP0052057B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8023906 1980-11-07
FR8023906A FR2493801B1 (en) 1980-11-07 1980-11-07 METHOD AND MACHINE FOR COVERING A LOAD OF A TUBULAR SHEATH

Publications (2)

Publication Number Publication Date
EP0052057A1 EP0052057A1 (en) 1982-05-19
EP0052057B1 true EP0052057B1 (en) 1984-08-08

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Application Number Title Priority Date Filing Date
EP19810401773 Expired EP0052057B1 (en) 1980-11-07 1981-11-06 Method and apparatus for covering a load with a tubular envelope

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EP (1) EP0052057B1 (en)
DE (1) DE3165442D1 (en)
FR (1) FR2493801B1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738079A (en) * 1971-02-11 1973-06-12 Auburn Eng Inc Bag type shrink wrapping apparatus
IT1106665B (en) * 1978-05-18 1985-11-18 Anidriti Dreste METHOD AND EQUIPMENT FOR FORMING AND FILLING ENVELOPES DERIVING THESE FROM TUBULAR MATERIAL IN THE COIL

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DE3165442D1 (en) 1984-09-13
EP0052057A1 (en) 1982-05-19
FR2493801A1 (en) 1982-05-14
FR2493801B1 (en) 1985-10-31

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