EP0775633A1 - Unfolding device for machines for the automatic making, filling and closing of packages in flexible film - Google Patents

Unfolding device for machines for the automatic making, filling and closing of packages in flexible film Download PDF

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Publication number
EP0775633A1
EP0775633A1 EP96402537A EP96402537A EP0775633A1 EP 0775633 A1 EP0775633 A1 EP 0775633A1 EP 96402537 A EP96402537 A EP 96402537A EP 96402537 A EP96402537 A EP 96402537A EP 0775633 A1 EP0775633 A1 EP 0775633A1
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EP
European Patent Office
Prior art keywords
assemblies
film
transverse weld
plane
transverse
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96402537A
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German (de)
French (fr)
Inventor
Henri Georges Jean-Claude Bois
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Flexico France SARL
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Flexico France SARL
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Publication date
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Publication of EP0775633A1 publication Critical patent/EP0775633A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/303—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes reciprocating along only one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/02—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks
    • B65B7/06—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks by collapsing mouth portion, e.g. to form a single flap
    • 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
    • B65B9/20—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 webs being formed into tubes in situ around the filling nozzles

Definitions

  • the present invention relates to the field of machines for forming, filling and automatically closing packaging based on flexible films, for example a thermoplastic material, in particular based on films comprising closure profiles, in particular with complementary male and female slides.
  • the film can be pre-equipped with closure profiles before it arrives on the neck, or alternatively the machine can comprise means for supplying closure profile, preferably complementary male and female slide profiles, and means suitable for fix by welding said sections on the film.
  • the Applicant has itself proposed, in document FR-A-2716260, an improvement consisting of a unfolding system comprising at least two suction cups placed respectively on either side of the packaging bags and capable of relative displacement in a general direction parallel to the transverse weld lines.
  • the present invention now aims to further improve the automatic packaging, filling and closing machines.
  • an unfolding system comprising two assemblies capable of sequential displacements, in approach and away from the transverse weld plane, which assemblies each support at least one elastic jack carrying a biasing member, said jack being inclined relative to the transverse weld plane and to the direction of movement of the assemblies, so that when the assemblies are brought closer to the transverse weld plane, the jacks are retracted and the biasing members automatically moved outwards.
  • each assembly carries a pair of jacks.
  • each cylinder is inclined by about 45 ° relative to the transverse weld plane and to the direction of movement of the assemblies.
  • the axes of the elastic cylinders intersect in the vicinity of the longitudinal axis of the machine.
  • the present invention applies in particular to the production of packaging based on films of thermoplastic material.
  • the invention can find application in the formation of sachets based on flexible film of different nature, for example based on aluminum or paper.
  • This longitudinal axis O-O is generally vertical. However, as a variant, for certain machines, the axis O-O can be horizontal.
  • the unfolding system comprises two assemblies 100 capable of sequential displacement in approach and in distancing from the transverse weld plane S.
  • These assemblies 100 are preferably symmetrical with respect to the transverse weld plane S.
  • This plane S will be called the main plane of symmetry hereinafter.
  • the assemblies 100 preferably have a second symmetry with respect to the section plane II-II of FIG. 2, orthogonal to the transverse weld plane S and passing through the longitudinal axis OO. This plane II-II will be called secondary plane of symmetry later.
  • the assemblies 100 are moved by any suitable conventional means, preferably fluid-actuated jacks. These are not shown in the appended figures to simplify the illustration.
  • the assemblies 100 are brought closer to the transverse weld plane S, before making a transverse weld, in order to stress the film across its width and to remove any folds that may be present.
  • the assemblies 100 are then moved away from the transverse weld plane S, after completion of the transverse weld, to allow the film to advance along the axis O-O.
  • the assemblies 100 are placed in a fixed position relative to the axis of advancement O-O.
  • each assembly 100 supports two elastic jacks 150.
  • Each of these elastic jacks 150 can be formed for example of a body 152 and a rod 154 movable in translation relative to the body 152 and urged in extension by an integrated spring not visible in the appended figures.
  • the axes 156 of the four elastic cylinders 150 are inclined on the order of 45 ° relative to the transverse weld plane S (main plane of symmetry) and relative to the secondary plane of symmetry which coincides with the direction of movement of the assemblies 100.
  • the axes 156 of the four elastic cylinders 150 are intersecting along the longitudinal axis OO.
  • each elastic cylinder 150 on the associated assembly 100 Preferably, means are provided allowing an adjustment positioning each elastic cylinder 150 on the associated assembly 100.
  • These adjustment means can take many configurations. They are shown diagrammatically under the reference 160 in FIG. 1 appended.
  • adjustment means 160 can be formed by grooves parallel to the secondary plane of symmetry II-II, and receiving complementary locking means. Such means 160 make it possible to adjust the position of the jacks 150 on the associated assembly 100, relative to the main plane of symmetry S, that is to say parallel to the secondary plane of symmetry II-II.
  • each elastic cylinder is equipped with a biasing member 170.
  • the biasing members 170 are essentially formed of a bar 172 oriented parallel to the transverse weld plane S-S.
  • means are provided for adjusting the position of the biasing members 172 with respect to the rods 154, in a plane parallel to the transverse welding plane S-S.
  • these adjustment means can be the subject of numerous embodiments.
  • these means for adjusting the biasing members can be formed by an oblong opening formed in the bars 172, parallel to the transverse weld plane SS and adapted to receive complementary locking members on the associated piston rod 154.
  • the biasing members 170 placed near the edge of the film intended to constitute the bottom of a sachet are preferably equipped with pads 176 directed towards the plane transverse welding S, allowing relative sliding between said pad and the film making up the bag.
  • biasing members 170 placed opposite the edge of the film intended to constitute the mouth of a bag and therefore generally equipped with relief closure profiles (shown on the right in FIG. 1) are preferably fitted with projecting fingers 178 projecting towards the transverse weld plane S.
  • each of the assemblies 100 is adapted to serve as a support for the jaws of transerval welding and / or the cutting blades making it possible to separate a finished bag from the downstream film.
  • each assembly 100 is further provided means designed to guarantee a positioning of each assembly 100 strictly parallel to the transverse weld plane S, that is to say a translational movement of each assembly 100 in a strictly orthogonal direction. to this transverse weld plane S.
  • these holding means can be formed of complementary structures provided respectively on the two assemblies 100, for example a finger or a rod integral with one of the assemblies 100, oriented perpendicularly to the transverse weld plane S and engaged in a complementary bore formed in the other assembly 100.
  • the aforementioned holding means comprise stops 200 integral with the chassis of the machine, symmetrical with respect to the transverse weld plane S and preferably having lateral facets 202 parallel to this plane.
  • roller means on each biasing member 170, to facilitate movement of each biasing member on the associated stop 200 and parallel to the transverse weld plane S.
  • each biasing member 170 is preferably provided with a drawer 180 fitted with a roller 182.
  • the roller 182 protrudes relative to the drawer 180 in the direction of the transverse weld plane S to rest on a stop 200 when the assembly 100 is moved closer to this welding plane S.
  • the drawer 180 which carries the roller 182 is capable of elastic movement relative to the bar 172 associated in a direction orthogonal to the welding plane transverse S.
  • the drawer 180 is however returned to a rest position relative to the bar 172, by an elastic member not shown in the accompanying figures for simplify the illustration.
  • the operation of the unfolding device according to the present invention is essentially as follows.
  • the two assemblies 100 are moved closer to the transverse weld plane S.
  • the positioning of the assemblies 100 parallel to the transverse weld plane S is defined by the support of the rollers 182 on the stops 200.
  • the pads 176 contact the edge of the film corresponding to the bottom of the bags.
  • the fingers 178 contact the opposite edge of the film corresponding to the mouth fitted with the closure profiles.
  • the rods 154 are retracted in the body 152. This leads to a displacement of the biasing members 170, and consequently of the pads 176 and fingers 178 radially outward from the longitudinal axis OO.
  • the two diametrically opposite edges of the tubular film, corresponding respectively to the bottom and to the mouth of the sachets are biased away with authorized relative movement between the film and the pads 176. This arrangement makes it possible to remove any fold possible on the film.
  • the assemblies 100 can be separated.
  • the pistons 154 and associated biasing members 170 then automatically return to their rest position for a new movement and biasing cycle.
  • the present invention offers many advantages over prior art unfolding systems.
  • the present invention makes it possible to completely release the central part of the tubular film and therefore authorizes the production of bags limited strictly to the useful height for packaging the product in question.
  • the present invention makes it possible to completely dispense with any clamp actuation system, in particular based on fluidic cylinders.
  • the present invention allows faster manufacturing sequences than the known prior machines.

Abstract

The system for removing creases from machine automatically filled and closed flexible film packaging, comprises two assemblies (100). These assemblies are displaced in sequence to approach and separate from the transverse welding plane (S). Each assembly supports an elastic actuator (150) carrying an assisting part (170) formed by a slide (172) directed parallel to the welding plane. The actuator is inclined to the transverse welding plane. The displacement direction of the assemblies is such that, when the assemblies approach the welding plane, the actuators are retracted and the slides are automatically displaced outwards.

Description

La présente invention concerne le domaine des machines de formation, remplissage et fermeture automatique d'emballages à base de films souples, par exemple un matériau thermoplastique, en particulier à base de films comportant des profilés de fermeture, notamment à glissières male et femelle complémentaires.The present invention relates to the field of machines for forming, filling and automatically closing packaging based on flexible films, for example a thermoplastic material, in particular based on films comprising closure profiles, in particular with complementary male and female slides.

On a déjà proposé de nombreuses machines à cet effet. On pourra trouver des exemples de celles-ci dans les documents US-A-4694975, US-A-4876842, US-A-5046300 et US-A-5127208.Many machines have already been proposed for this purpose. Examples of these can be found in documents US-A-4694975, US-A-4876842, US-A-5046300 and US-A-5127208.

La plupart des machines automatiques connues pour la formation, le remplissage et la fermeture d'emballages à base de films en matériau thermoplastique comprennent :

  • un col de formage qui reçoit en entrée le film à l'état plan en provenance d'un dérouleur et fournit en sortie le film conformé en tube,
  • une goulotte de remplissage qui débouche dans ce col de formage et par conséquent dans ledit tube,
  • des moyens de soudure longitudinale pour souder les bords du film et fermer le tube longitudinalement, et
  • des moyens aptes à générer séquentiellement une première soudure transversale avant qu'un produit ne soit introduit dans le tube par la goulotte de remplissage, puis une seconde soudure transversale, quand le produit a été introduit dans le tube, pour fermer un emballage autour de ce dernier.
Most of the automatic machines known for forming, filling and closing packaging based on films of thermoplastic material include:
  • a forming neck which receives the film in the planar state from an unwinder and provides the film-shaped tube as output,
  • a filling chute which opens into this forming neck and consequently into said tube,
  • longitudinal welding means for welding the edges of the film and closing the tube longitudinally, and
  • means able to sequentially generate a first transverse weld before a product is introduced into the tube by the filler neck, then a second transverse weld, when the product has been introduced into the tube, to close a packaging around this latest.

Le film peut être pré-équipé des profilés de fermeture avant son arrivée sur le col, ou en variante la machine peut comprendre des moyens d'alimentation en profilé de fermeture, préférentiellement des profilés à glissières male et femelle complémentaires, et des moyens aptes à fixer par soudure lesdits profilés sur le film.The film can be pre-equipped with closure profiles before it arrives on the neck, or alternatively the machine can comprise means for supplying closure profile, preferably complementary male and female slide profiles, and means suitable for fix by welding said sections on the film.

Ces machines ont déjà rendu de grands services.These machines have already done great service.

Toutefois, elles ne donnent pas totalement satisfaction.However, they are not entirely satisfactory.

En particulier, on constate parfois la présence de plissages dans les feuilles, notamment en matériau thermoplastique, composant les parois des emballages obtenus.In particular, sometimes the presence of wrinkles in the sheets, especially of thermoplastic material, making up the walls of the packages obtained, is observed.

D'une part, ces plissages gênent les opérations de soudure transversale en raison des surépaisseurs qu'elles occasionnent et peuvent de ce fait créer des défaut d'étanchéité.On the one hand, these pleating interfere with transverse welding operations because of the extra thicknesses they cause and can therefore create leaks.

D'autre part, ces plissages détériorent l'esthétique des emballages obtenus.On the other hand, these pleating deteriorate the aesthetics of the packaging obtained.

Différentes dispositions ont déjà été proposés pour tenter d'éliminer ces plissages.Various measures have already been proposed in an attempt to eliminate these wrinkles.

On a notamment proposé des moyens formés de pinces, le plus souvent commandés par des vérins ou équivalents pour solliciter le film en extension dans sa largeur. Sur ce point, on pourrait se référer par exemple aux documents FR-A-2638419, EP-A-0319995, US-A-4829745.In particular, means have been proposed which are formed by grippers, most often controlled by jacks or the like to urge the film in extension across its width. On this point, one could refer for example to documents FR-A-2638419, EP-A-0319995, US-A-4829745.

La Demanderesse a elle-même proposé, dans le document FR-A-2716260, un perfectionnement consistant en un système de déplissage comprenant au moins deux ventouses placées respectivement de part et d'autre des sachets d'emballage et susceptibles de déplacement relatif dans une direction générale parallèle aux lignes de soudure transversale.The Applicant has itself proposed, in document FR-A-2716260, an improvement consisting of a unfolding system comprising at least two suction cups placed respectively on either side of the packaging bags and capable of relative displacement in a general direction parallel to the transverse weld lines.

La présente invention a maintenant pour but de perfectionner encore les machines de formation, remplissage et fermeture automatique d'emballages.The present invention now aims to further improve the automatic packaging, filling and closing machines.

Ce but est atteint selon la présente invention grâce à un système de déplissage comprenant deux ensembles susceptibles de déplacements séquencés, en rapprochement et en éloignement du plan de soudure transversal, lesquels ensembles supportent chacun au moins un vérin élastique portant un organe de sollicitation, ledit vérin étant incliné par rapport au plan de soudure transversal et à la direction de déplacement des ensembles, de sorte que lors du rapprochement des ensembles vers le plan de soudure transversal, les vérins soient rétractés et les organes de sollicitation déplacés automatiquement vers l'extérieur.This object is achieved according to the present invention thanks to an unfolding system comprising two assemblies capable of sequential displacements, in approach and away from the transverse weld plane, which assemblies each support at least one elastic jack carrying a biasing member, said jack being inclined relative to the transverse weld plane and to the direction of movement of the assemblies, so that when the assemblies are brought closer to the transverse weld plane, the jacks are retracted and the biasing members automatically moved outwards.

Selon une autre caractéristique avantageuse de l'invention, chaque ensemble porte une paire de vérins.According to another advantageous characteristic of the invention, each assembly carries a pair of jacks.

Selon une autre caractéristique avantageuse de l'invention, chaque vérin est incliné d'environ 45° par rapport au plan de soudure transversal et à la direction de déplacement des ensembles.According to another advantageous characteristic of the invention, each cylinder is inclined by about 45 ° relative to the transverse weld plane and to the direction of movement of the assemblies.

Selon une autre caractéristique avantageuse de l'invention, les axes des vérins élastiques s'intersectent au voisinage de l'axe longitudinal de la machine.According to another advantageous characteristic of the invention, the axes of the elastic cylinders intersect in the vicinity of the longitudinal axis of the machine.

D'autres caractéristiques, buts et avantages de la présente invention apparaîtront à la lecture détaillée qui va suivre , et en regard des dessins donnés à titre d'exemple non limitatif et sur lesquels :

  • la figure 1 représente une vue schématique en coupe transversale d'une machine de formation remplissage et fermeture automatique d'emballages conforme à la présente invention, au niveau du système de déplissage, et
  • la figure 2 représente une vue en coupe axiale de la même machine selon le plan de coupe référencé II-II sur la figure 1.
Other characteristics, aims and advantages of the present invention will become apparent on reading the following description, and with reference to drawings given by way of non-limiting example and in which:
  • FIG. 1 represents a schematic cross-sectional view of a machine for filling and closing automatic packaging according to the present invention, at the level of the unfolding system, and
  • FIG. 2 represents a view in axial section of the same machine according to the cutting plane referenced II-II in FIG. 1.

La présente invention s'applique en particulier à la réalisation d'emballages à base de films en matériau thermoplastique. Cependant, l'invention peut trouver application dans la formation de sachets à base de film souple de nature différente, par exemple à base d'aluminium ou de papier.The present invention applies in particular to the production of packaging based on films of thermoplastic material. However, the invention can find application in the formation of sachets based on flexible film of different nature, for example based on aluminum or paper.

La structure générale des machines de formation, remplissage et fermeture automatique d'emballages à base de film souple, bien connue de l'homme de l'art, ne sera pas décrite dans le détail par la suite.The general structure of machines for forming, filling and automatically closing packaging based on flexible film, well known to those skilled in the art, will not be described in detail below.

Sur les figures annexées, l'axe longitudinal de ces machines, qui coïncide avec la direction de déplacement du film destiné à constituer l'emballage est référencé O-O.In the appended figures, the longitudinal axis of these machines, which coincides with the direction of movement of the film intended to constitute the packaging is referenced O-O.

Cet axe longitudinal O-O est généralement vertical. Cependant, en variante, pour certaines machines, l'axe O-O peut être horizontal.This longitudinal axis O-O is generally vertical. However, as a variant, for certain machines, the axis O-O can be horizontal.

Sur les figures 1 et 2 annexées, on a représenté sous la référence 10 la goulotte de remplissage classique qui débouche dans le tube formé par le film conformé sur le col de formage.In Figures 1 and 2 attached, there is shown under reference 10 the conventional filling chute which opens into the tube formed by the film shaped on the forming neck.

En outre, sur les figures 1 et 2 annexées, on a référencé S le plan de soudure transversal du film.In addition, in FIGS. 1 and 2 appended, the transverse weld plane of the film is referenced S.

Comme on l'a indiqué précédemment, le système de déplissage conforme à la présente invention, comprend deux ensembles 100 susceptibles de déplacement séquencés en rapprochement et en éloignement du plan de soudure transversal S. Ces ensembles 100 sont de préférence symétriques entre eux par rapport au plan de soudure transversal S. Ce plan S sera dénommé plan de symétrie principal par la suite. Par ailleurs, les ensembles 100 présentent de préférence une seconde symétrie par rapport au plan de coupe II-II de la figure 2, orthogonal au plan de soudure transversal S et passant par l'axe longitudinal O-O. Ce plan II-II sera dénommé plan de symétrie secondaire par la suite.As indicated above, the unfolding system according to the present invention comprises two assemblies 100 capable of sequential displacement in approach and in distancing from the transverse weld plane S. These assemblies 100 are preferably symmetrical with respect to the transverse weld plane S. This plane S will be called the main plane of symmetry hereinafter. Furthermore, the assemblies 100 preferably have a second symmetry with respect to the section plane II-II of FIG. 2, orthogonal to the transverse weld plane S and passing through the longitudinal axis OO. This plane II-II will be called secondary plane of symmetry later.

Les ensembles 100 sont déplacés par tout moyen classique approprié, de préférence des vérins à commande fluidique. Ceux-ci ne sont pas représentés sur les figures annexées pour simplifier l'illustration.The assemblies 100 are moved by any suitable conventional means, preferably fluid-actuated jacks. These are not shown in the appended figures to simplify the illustration.

Les ensembles 100 sont rapprochés du plan de soudure transversal S, avant réalisation d'une soudure transversale, pour solliciter le film dans sa largeur et supprimer tout pli éventuellement présent. Les ensembles 100 sont ensuite éloignés du plan de soudure transversal S, après réalisation de la soudure transversale, pour permettre l'avancement du film selon l'axe O-O.The assemblies 100 are brought closer to the transverse weld plane S, before making a transverse weld, in order to stress the film across its width and to remove any folds that may be present. The assemblies 100 are then moved away from the transverse weld plane S, after completion of the transverse weld, to allow the film to advance along the axis O-O.

De préférence, les ensembles 100 sont placés dans une position fixe par rapport à l'axe d'avancement O-O. Cependant, en variante, on peut prévoir des moyens assurant un déplacement des ensembles 100 parallèlement à l'axe O-O, là encore, en aller retour, pour accompagner le film, dans son avance, et limiter les temps morts dus au temps de déplacement des ensembles 100 en rapprochement et éloignement du plan de soudure transversal S.Preferably, the assemblies 100 are placed in a fixed position relative to the axis of advancement O-O. However, as a variant, it is possible to provide means ensuring a displacement of the assemblies 100 parallel to the axis OO, here again, going back and forth, to accompany the film, in its advance, and limit the dead times due to the travel time of the assemblies 100 in approach and distance from the transverse weld plane S.

Selon le mode de réalisation préférentiel représenté sur les figures annexées, chaque ensemble 100 supporte deux vérins élastiques 150.According to the preferred embodiment shown in the appended figures, each assembly 100 supports two elastic jacks 150.

Chacun de ces vérins élastiques 150 peut être formé par exemple d'un corps 152 et d'une tige 154 mobile à translation par rapport au corps 152 et sollicitée en extension par un ressort intégré non visible sur les figures annexées.Each of these elastic jacks 150 can be formed for example of a body 152 and a rod 154 movable in translation relative to the body 152 and urged in extension by an integrated spring not visible in the appended figures.

Selon le mode de réalisation particulier et non limitatif représenté sur les figures annexées, les axes 156 des quatre vérins élastiques 150 sont inclinés de l'ordre de 45° par rapport au plan de soudure transversal S (plan de symétrie principal) et par rapport au plan de symétrie secondaire qui coïncide avec la direction de déplacement des ensembles 100. Ainsi, les axes 156 des quatre vérins élastiques 150 sont sécants selon l'axe longitudinal O-O.According to the particular and nonlimiting embodiment shown in the appended figures, the axes 156 of the four elastic cylinders 150 are inclined on the order of 45 ° relative to the transverse weld plane S (main plane of symmetry) and relative to the secondary plane of symmetry which coincides with the direction of movement of the assemblies 100. Thus, the axes 156 of the four elastic cylinders 150 are intersecting along the longitudinal axis OO.

On comprend que cette disposition permet de libérer un espace central important entre les deux vérins élastiques 150 équipant chaque ensemble 100.It is understood that this arrangement frees up a large central space between the two elastic jacks 150 fitted to each assembly 100.

De préférence, il est prévu des moyens permettant un réglage de positionnement de chaque vérin élastique 150 sur l'ensemble 100 associé. Ces moyens de réglage peuvent prendre de nombreuses configurations. Ils sont schématisés sous la référence 160 sur la figure 1 annexée.Preferably, means are provided allowing an adjustment positioning each elastic cylinder 150 on the associated assembly 100. These adjustment means can take many configurations. They are shown diagrammatically under the reference 160 in FIG. 1 appended.

Ces moyens de réglage 160 peuvent être formés de rainures parallèles au plan de symétrie secondaire II-II, et recevant des moyens de blocage complémentaires. De tels moyens 160 permettent de régler la position des vérins 150 sur l'ensemble 100 associé, par rapport au plan de symétrie principal S, c'est-à-dire parallèlement au plan de symétrie secondaire II-II.These adjustment means 160 can be formed by grooves parallel to the secondary plane of symmetry II-II, and receiving complementary locking means. Such means 160 make it possible to adjust the position of the jacks 150 on the associated assembly 100, relative to the main plane of symmetry S, that is to say parallel to the secondary plane of symmetry II-II.

La tige 154 de chaque vérin élastique est équipée d'un organe de sollicitation 170.The rod 154 of each elastic cylinder is equipped with a biasing member 170.

En l'espèce, les organes de sollicitation 170 sont formés essentiellement d'une barrette 172 orientée parallèlement au plan de soudure transversal S-S.In this case, the biasing members 170 are essentially formed of a bar 172 oriented parallel to the transverse weld plane S-S.

De préférence, il est prévu des moyens permettant de régler la position des organes de sollicitation 172 par rapport aux tiges 154, dans un plan parallèle au plan de soudure transversal S-S. Là encore, ces moyens de réglage peuvent faire l'objet de nombreux modes de réalisation.Preferably, means are provided for adjusting the position of the biasing members 172 with respect to the rods 154, in a plane parallel to the transverse welding plane S-S. Again, these adjustment means can be the subject of numerous embodiments.

Comme illustré sur la figure 1 annexée sous la référence 174, ces moyens de réglage des organes de sollicitation peuvent être formés d'une lumière oblongue formée dans les barrettes 172, parallèlement au plan de soudure transversal S-S et adaptée pour recevoir des organes de blocage complémentaires sur la tige 154 de piston associée.As illustrated in FIG. 1 appended under the reference 174, these means for adjusting the biasing members can be formed by an oblong opening formed in the bars 172, parallel to the transverse weld plane SS and adapted to receive complementary locking members on the associated piston rod 154.

Plus précisément encore, selon la présente invention, les organes de sollicitation 170 placés près du bord du film destiné à constituer le fond d'un sachet (représentés sur la gauche de la figure 1) sont de préférence équipés de patins 176 dirigés vers le plan de soudure transversal S, autorisant un glissement relatif entre ledit patin et le film composant le sachet.More precisely still, according to the present invention, the biasing members 170 placed near the edge of the film intended to constitute the bottom of a sachet (represented on the left of FIG. 1) are preferably equipped with pads 176 directed towards the plane transverse welding S, allowing relative sliding between said pad and the film making up the bag.

En revanche, les organes de sollicitation 170 placés en regard du bord du film destiné à constituer l'embouchure d'un sachet, et équipé par conséquent généralement de profilés de fermeture en relief (représentés sur la droite de la figure 1) sont de préférence équipés de doigts de sollicitation 178 en saillie dirigés vers le plan de soudure transversal S.On the other hand, the biasing members 170 placed opposite the edge of the film intended to constitute the mouth of a bag, and therefore generally equipped with relief closure profiles (shown on the right in FIG. 1) are preferably fitted with projecting fingers 178 projecting towards the transverse weld plane S.

De préférence, chacun des ensembles 100 est adapté pour servir de support aux mâchoires de soudure transervale et/ou aux lames de coupe permettant de séparer un sachet terminé du film aval.Preferably, each of the assemblies 100 is adapted to serve as a support for the jaws of transerval welding and / or the cutting blades making it possible to separate a finished bag from the downstream film.

Selon l'invention, il est prévu en outre des moyens conçus pour garantir un positionnement de chaque ensemble 100 rigoureusement parallèlement au plan de soudure transversal S, c'est-à-dire un déplacement à translation de chaque ensemble 100 dans une direction rigoureusement orthogonale à ce plan de soudure transversal S.According to the invention, there are further provided means designed to guarantee a positioning of each assembly 100 strictly parallel to the transverse weld plane S, that is to say a translational movement of each assembly 100 in a strictly orthogonal direction. to this transverse weld plane S.

Ces moyens de maintien peuvent faire l'objet de nombreux modes de réalisation.These holding means can be the subject of numerous embodiments.

Selon un premier mode de réalisation, ces moyens de maintien peuvent être formés de structures complémentaires prévues respectivement sur les deux ensembles 100, par exemple un doigt ou une tige solidaire de l'un des ensembles 100, orienté perpendiculairement au plan de soudure transversal S et engagé dans un alésage complémentaire formé dans l'autre ensemble 100.According to a first embodiment, these holding means can be formed of complementary structures provided respectively on the two assemblies 100, for example a finger or a rod integral with one of the assemblies 100, oriented perpendicularly to the transverse weld plane S and engaged in a complementary bore formed in the other assembly 100.

Selon une autre variante de réalisation représentée sur les figures annexées, les moyens de maintien précités comprennent des butées 200 solidaires du chassis de la machine, symétriques par rapport au plan de soudure transversal S et possédant de préférence des facettes latérales 202 parallèles à ce plan.According to another alternative embodiment shown in the appended figures, the aforementioned holding means comprise stops 200 integral with the chassis of the machine, symmetrical with respect to the transverse weld plane S and preferably having lateral facets 202 parallel to this plane.

Dans ce cas, il est prévu de préférence en outre, des moyens à galets, sur chaque organe de sollicitation 170, pour faciliter un déplacement de chaque organe de sollicitation sur la butée 200 associée et parallèlement au plan de soudure transversale S.In this case, it is preferably further provided, roller means, on each biasing member 170, to facilitate movement of each biasing member on the associated stop 200 and parallel to the transverse weld plane S.

Ainsi, comme représenté sur la figure 1 annexée, chaque organe de sollicitation 170 est muni de préférence d'un tiroir 180 équipé d'un galet 182. Le galet 182 fait saillie par rapport au tiroir 180 dans la direction du plan de soudure transversal S pour reposer sur une butée 200 lorsque l'ensemble 100 est déplacé en rapprochement de ce plan de soudure S. Le tiroir 180 qui porte le galet 182 est susceptible de débattement élastique par rapport à la barrette 172 associée dans une direction orthogonale au plan de soudure transversale S. Le tiroir 180 est cependant ramené dans une position de repos par rapport à la barrette 172, par un organe élastique non représenté sur les figures annexées pour simplifier l'illustration.Thus, as shown in the attached FIG. 1, each biasing member 170 is preferably provided with a drawer 180 fitted with a roller 182. The roller 182 protrudes relative to the drawer 180 in the direction of the transverse weld plane S to rest on a stop 200 when the assembly 100 is moved closer to this welding plane S. The drawer 180 which carries the roller 182 is capable of elastic movement relative to the bar 172 associated in a direction orthogonal to the welding plane transverse S. The drawer 180 is however returned to a rest position relative to the bar 172, by an elastic member not shown in the accompanying figures for simplify the illustration.

En pratique, on peut prévoir un ensemble de déplissage du type illustré sur les figures annexées au-dessous et/ou au-dessus des machoires de soudure transversale.In practice, it is possible to provide an unfolding assembly of the type illustrated in the attached figures below and / or above the transverse welding jaws.

Le fonctionnement du dispositif de déplissage conforme à la présente invention est essentiellement le suivant.The operation of the unfolding device according to the present invention is essentially as follows.

Avant réalisation d'une soudure transversale, les deux ensembles 100 sont déplacés en rapprochement du plan de soudure transversale S. Le positionnement des ensembles 100 parallèlement au plan de soudure transversale S est défini par l'appui des galets 182 sur les butées 200.Before carrying out a transverse weld, the two assemblies 100 are moved closer to the transverse weld plane S. The positioning of the assemblies 100 parallel to the transverse weld plane S is defined by the support of the rollers 182 on the stops 200.

Les patins 176 contactent le bord le film correspondant au fond des sachets. Les doigts 178 contactent le bord opposé du film correspondant à l'embouchure équipée des profilés de fermeture. Après appui des galets 182 sur les butées 200, les tiges 154 sont rétractées dans le corps 152. Ceci conduit à un déplacement des organes de sollicitation 170, et par conséquent des patins 176 et doigts 178 radialement vers l'extérieur de l'axe longitudinal O-O. On comprend que de ce fait, les deux bords diamétralement opposés du film tubulaire, correspondant respectivement au fond et à l'embouchure des sachets sont sollicités en éloignement avec déplacement relatif autorisé entre le film et les patins 176. Cette disposition permet de supprimer tout pli éventuel sur le film.The pads 176 contact the edge of the film corresponding to the bottom of the bags. The fingers 178 contact the opposite edge of the film corresponding to the mouth fitted with the closure profiles. After support of the rollers 182 on the stops 200, the rods 154 are retracted in the body 152. This leads to a displacement of the biasing members 170, and consequently of the pads 176 and fingers 178 radially outward from the longitudinal axis OO. We understand that because of this, the two diametrically opposite edges of the tubular film, corresponding respectively to the bottom and to the mouth of the sachets are biased away with authorized relative movement between the film and the pads 176. This arrangement makes it possible to remove any fold possible on the film.

Une fois la soudure transversale réalisée, les ensembles 100 peuvent être écartés.Once the transverse weld has been made, the assemblies 100 can be separated.

Les pistons 154 et organes de sollicitation 170 associés reprennent alors automatiquement leur position de repos en vue d'un nouveau cycle de déplacement et sollicitation.The pistons 154 and associated biasing members 170 then automatically return to their rest position for a new movement and biasing cycle.

La présente invention offre de nombreux avantages par rapport aux systèmes de déplissage antérieurs connus.The present invention offers many advantages over prior art unfolding systems.

Tout d'abord, on notera que la plupart des dispositifs de déplissage connus occupent toute la largeur des machines de formation remplissage et fermeture automatique de sachets et de ce fait exigent généralement une hauteur de sachet supérieure à la hauteur utile d'une valeur correspondant à l'encombrement des systèmes de dépistage.First of all, it will be noted that most of the known unfolding devices occupy the entire width of the automatic bag filling and closing forming machines and therefore generally require a bag height greater than the useful height by a value corresponding to the congestion of screening systems.

Par contre, la présente invention permet de libérer totalement la partie centrale du film tubulaire et par conséquent autorise la réalisation de sachets limités strictement à la hauteur utile pour l'emballage du produit considéré.On the other hand, the present invention makes it possible to completely release the central part of the tubular film and therefore authorizes the production of bags limited strictly to the useful height for packaging the product in question.

En outre, la présente invention permet de s'affranchir totalement de tout système d'actionnement de pince, notamment à base de vérins fluidiques. Ainsi, la présente invention autorise des séquences de fabrication plus rapide que les machines antérieures connues.In addition, the present invention makes it possible to completely dispense with any clamp actuation system, in particular based on fluidic cylinders. Thus, the present invention allows faster manufacturing sequences than the known prior machines.

Bien entendu la présente invention n'est pas limitée au mode de réalisation particulier qui vient d'être décrit, mais s'étend à toute variante conforme à son esprit.Of course the present invention is not limited to the particular embodiment which has just been described, but extends to any variant in accordance with its spirit.

Claims (15)

Système de déplissage pour machines de formation, remplissage et fermeture automatique d'emballages à base de film souple, caractérisé par le fait qu'il comprend deux ensembles (100) susceptibles de déplacements séquencés en rapprochement et éloignement du plan de soudure transversale (S), lesquels ensembles (100) supportent chacun au moins un vérin élastique (150) portant un organe de sollicitation (170), ledit vérin (150) étant incliné par rapport au plan de soudure transversal (S) et la direction de déplacement des ensembles (100) de sorte que lors du rapprochement des ensembles vers le plan de soudure transversal (S), les vérins (150) soient rétractés et les organes de sollicitation (170) déplacés automatiquement vers l'extérieur.Unfolding system for machines for forming, filling and automatically closing packaging based on flexible film, characterized in that it comprises two assemblies (100) capable of sequential displacements in approach and distance from the transverse sealing plane (S) , which assemblies (100) each support at least one elastic jack (150) carrying a biasing member (170), said jack (150) being inclined relative to the transverse weld plane (S) and the direction of movement of the assemblies ( 100) so that when the assemblies are brought closer to the transverse weld plane (S), the jacks (150) are retracted and the biasing members (170) automatically moved outwards. Système selon la revendication 1, caractérisé par le fait que chaque ensemble (100) porte une paire de vérins (150).System according to claim 1, characterized in that each assembly (100) carries a pair of jacks (150). Système selon l'une des revendications 1 ou 2, caractérisé par le fait que les axes (156) des vérins élastiques (150) sont inclinés de l'ordre de 45° par rapport au plan de soudure transversale (S) et à la direction de déplacement des ensembles (100).System according to one of claims 1 or 2, characterized in that the axes (156) of the elastic cylinders (150) are inclined on the order of 45 ° relative to the transverse weld plane (S) and to the direction moving the assemblies (100). Système selon l'une des revendications 1 à 3, caractérisé par le fait que les axes (156) des vérins (150) s'intersectent sur l'axe longitudinal O-O de la machine.System according to one of claims 1 to 3, characterized in that the axes (156) of the cylinders (150) intersect on the longitudinal axis O-O of the machine. Système selon l'une des revendications 1 à 4, caractérisé par le fait que les organes de sollicitation placés en regard du côté du film destiné à constituer le fond d'un sachet sont équipés de patins de glissement (176).System according to one of claims 1 to 4, characterized in that the biasing members placed opposite the side of the film intended to constitute the bottom of a bag are equipped with sliding pads (176). Système selon l'une des revendications 1 à 5, caractérisé par le fait que les organes de sollicitation (170) placés en regard des bords du film délimitant l'ouverture de sachets et équipés de profilés de fermeture sont munis de doigts de sollicitation (178).System according to one of claims 1 to 5, characterized in that the biasing members (170) placed opposite the edges of the film delimiting the opening of sachets and equipped with closure profiles are provided with biasing fingers (178 ). Système selon l'une des revendications 1 à 6, caractérisé par le fait que chaque ensemble (100) sert de support aux machoires de soudure transversales et/ou à des lames de coupe.System according to one of claims 1 to 6, characterized in that each assembly (100) serves to support the transverse welding jaws and / or cutting blades. Système selon l'une des revendications 1 à 7, caractérisé par le fait qu'il comprend des moyens (200) aptes à maintenir les ensembles (100) parallèles au plan de soudure transversal (S).System according to one of claims 1 to 7, characterized in that it comprises means (200) capable of holding the assemblies (100) parallel to the transverse weld plane (S). Système selon la revendication 8, caractérisé par le fait que les moyens de maintien sont formés de structures complémentaires orientées perpendiculairement au plan de soudure transversale (S) qui sont prévues respectivement sur les deux ensembles (100).System according to claim 8, characterized in that the holding means are formed of complementary structures oriented perpendicular to the transverse weld plane (S) which are provided respectively on the two assemblies (100). Système selon la revendication 8, caractérisé par le fait que les moyens de maintien comprennent une butée (200) symétrique par rapport au plan de soudure transversale (S).System according to claim 8, characterized in that the holding means comprise a stop (200) symmetrical with respect to the transverse weld plane (S). Système selon la revendication 10, caractérisé par le fait que chaque ensemble (100) est muni sur son organe de sollicitation (170) d'au moins un galet (182) apte à rouler sur la butée (200).System according to claim 10, characterized in that each assembly (100) is provided on its biasing member (170) with at least one roller (182) capable of rolling on the stop (200). Système selon la revendication 11, caractérisé par le fait que chaque galet (182) est prévu sur un tiroir (180) susceptible de débattement élastique par rapport à l'organe de sollicitation (170) associé.System according to claim 11, characterized in that each roller (182) is provided on a drawer (180) capable of elastic movement relative to the associated biasing member (170). Système selon l'une des revendications 1 à 12, caractérisé par le fait qu'il est prévu des moyens (160) autorisant un réglage de position de chaque vérin élastique (150) par rapport à un chassis.System according to one of claims 1 to 12, characterized in that means (160) are provided allowing a position adjustment of each elastic cylinder (150) relative to a frame. Système selon l'une des revendications 1 à 13, caractérisé par le fait qu'il est prévu des moyens (174) autorisant un réglage de positionnement de chaque organe de sollicitation (170) par rapport à la tige (154) de vérin élastique associé (150) parallèlement au plan de soudure transversale (S).System according to one of claims 1 to 13, characterized in that means (174) are provided allowing adjustment of positioning of each biasing member (170) relative to the rod (154) of associated elastic jack (150) parallel to the transverse weld plane (S). Machine de formation, remplissage et fermeture automatique d'emballages à base de film souple, par exemple en matériau thermoplastique, en particulier à base de film comportant des profilés de fermeture, notamment glissières male et femelle complémentaires comprenant : - un col de formage qui reçoit en entrée le film à l'état plan en provenance d'un dérouleur et fournit en sortie le film conformé en tube, - une goulotte de remplissage qui débouche dans ce col de formage et par conséquent dans ledit tube, - des moyens de soudure longitudinale pour souder les bords du film et fermer le tube longitudinalement, et - des moyens aptes à générer séquentiellement une première soudure transversale avant qu'un produit ne soit introduit dans le tube par la goulotte de remplissage, puis une seconde soudure transversale (44) quand le produit a été introduit dans le tube, pour fermer un emballage autour de ce dernier, caractérisé par le fait qu'il comprend en outre un système de déplissage conforme à l'une des revendications 1 à 14.Machine for forming, filling and automatically closing packaging based on flexible film, for example in thermoplastic material, in particular based on film comprising closure profiles, in particular complementary male and female slides comprising: - a forming neck which receives the film in the planar state from an unwinder and provides the film shaped tube output, - a filling chute which opens into this forming neck and therefore into said tube, longitudinal welding means for welding the edges of the film and closing the tube longitudinally, and means capable of sequentially generating a first transverse weld before a product is introduced into the tube by the filler neck, then a second transverse seal (44) when the product has been introduced into the tube, to close a package around the latter, characterized in that it further comprises an unfolding system according to one of claims 1 to 14.
EP96402537A 1995-11-27 1996-11-26 Unfolding device for machines for the automatic making, filling and closing of packages in flexible film Withdrawn EP0775633A1 (en)

Applications Claiming Priority (2)

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FR9514010A FR2741592B1 (en) 1995-11-27 1995-11-27 FOLDING SYSTEM FOR AUTOMATIC FORMING, FILLING AND CLOSING MACHINES FOR PACKAGES BASED ON FLEXIBLE FILM
FR9514010 1995-11-27

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EP (1) EP0775633A1 (en)
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US5857310A (en) 1999-01-12
FR2741592A1 (en) 1997-05-30
CA2190084A1 (en) 1997-05-28
CA2190084C (en) 2001-02-13
FR2741592B1 (en) 1998-02-13

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