EP0630813A1 - Device for handling and holding the free end of a film in a streamer machine - Google Patents

Device for handling and holding the free end of a film in a streamer machine Download PDF

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Publication number
EP0630813A1
EP0630813A1 EP94401395A EP94401395A EP0630813A1 EP 0630813 A1 EP0630813 A1 EP 0630813A1 EP 94401395 A EP94401395 A EP 94401395A EP 94401395 A EP94401395 A EP 94401395A EP 0630813 A1 EP0630813 A1 EP 0630813A1
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EP
European Patent Office
Prior art keywords
film
load
jaws
plate
wrapping
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Withdrawn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
EP94401395A
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German (de)
French (fr)
Inventor
Aimé Benhamou
Michel Bregier
Hans Niewenhuis
Daniel Pioffet
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.)
Signode France SAS
Original Assignee
ITW Mima Europe
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Filing date
Publication date
Application filed by ITW Mima Europe filed Critical ITW Mima Europe
Publication of EP0630813A1 publication Critical patent/EP0630813A1/en
Withdrawn legal-status Critical Current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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/04—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated
    • B65B11/045—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated by rotating platforms supporting the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
    • B65B11/025—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders by webs revolving around stationary articles

Definitions

  • the present invention relates to a load banding machine.
  • the main function of wrapping techniques by wrapping is to give a load formed by a stack the cohesion necessary to preserve the stability of the stack during its handling.
  • the means used to ensure this cohesion is a stretch film which is wound in the stretched state around the stack under a certain tension, low, the film tending to shrink slightly and to be pressed on the load. In general, at least two winding layers are produced.
  • the film supply station includes a film reel associated with a pre-stretching device and is movable vertically along its support (if the axis of the load is vertical) in order to be able to sweep the whole of the load height by helical winding.
  • the present invention intends to propose a simple device for performing these functions at the start and end of the wrapping cycle, further making it possible to improve the quality of the finish of the packaging and the speed of execution of the cycle start and end operations.
  • the subject of the invention is, in a wrapping machine for wrapping a load comprising a device for supplying a pre-stretched film, animated with respect to a longitudinal axis of the load to be packed with a relative helical movement, a device for handling the free end of the film between two wrapping cycles which comprises a support plate for the film against the load, the length of which is at least equal to the width of the film used and, near one of the long edges of this plate, a pair of jaws movable relative to each other along this edge to crease and pinch between them the portion of film between the plate applied to the load and the film supply device.
  • the second advantage of this provision is in the possibility of stopping the wrapping anywhere on the external surface of the load. Indeed, in current machines, the wrapping stops most often in the low position, after having passed the film during the last turn, in a clamp fixed relative to the load with which it can be maintained after cutting.
  • Another advantage of this arrangement lies in the fact that the film when it is caught between the jaws, is shaped into a wick which withstands the tensile forces which must be printed on the film, in particular at the start of each cycle of wrapping, which allows to go up quickly in speed without fear of a rupture of the film.
  • the plate and the jaws are mounted at the end of a movable support perpendicular to the axis of the load.
  • the support can be moved along a stationary guide parallel to the axis of the load.
  • the device further comprises a clamp fixed relative to the load located at one of its longitudinal ends, the location of which is, at the end of the wrapping cycle, located between the film supply device and the clamping jaws of the film, in the vicinity of the path of these jaws during the operation of the support relative to the load.
  • a load 1 here in the form of a rectangular parallelepiped resting by its lower face 2 on a support not shown in a machine which comprises a device for supplying a pre-stretched wrapping film 3 , this device here being simply represented by a coil 4 and a support 5 for the coil 4.
  • the machine of the invention comprises a fixed frame, a part 7 of which constitutes a slide for a carriage 8 for supporting a foldable arm 9 for a plate 10 intended to support the film 3 against the load 2 at the end of wrapping.
  • the plate 10 is associated by a connection symbolized at 11 with a set of slides 12 for movable jaws 13 and 14 along the set of slides 12 which is parallel to one of the edges 10a of the plate 10.
  • the set of slides 12 therefore the jaws 13 and 14 are located between the plate 10, in the immediate vicinity thereof, and the film supply device 3.
  • the upper jaw 14 is further equipped with a stirrup 15 in the direction of the film supply device, this stirrup extending above the plane of the jaw 14 and having at its free end substantially in the plane of the jaw 14 , a finger 16, the function of which will be explained below.
  • the load 1 When the wrapping is finished, the load 1 has its face opposite the frame part 7.
  • the automatic control of the machine adjusts the height of the carriage 8 and unfolds the arm 9 so that the plate 10 comes to bear on the face la by pressing the film 3 on this face la as illustrated by the arrow A.
  • the jaws 13 and 14 Prior to this movement, the jaws 13 and 14 were separated from each other by means of actuators of the jack type, along the slides 12, the distance separating them when they are spaced being greater than the width of the film 3 applied to the load 1.
  • the jaws 13 and 14 when the plate 10 is pressed on the face 1a of the load, are brought closer to one another according to the arrows B.
  • each of the jaws travels substantially half the distance which separates it from the other, but it is not departing from the scope of the invention to provide a fixed lower jaw 13 for example and a movable upper jaw 14 which covers the entire length of the slides 12.
  • a fixed lower jaw 13 for example
  • a movable upper jaw 14 which covers the entire length of the slides 12.
  • the plate 10 may be a heat-sealing heat-sealing plate for the last turn of the film on the load.
  • the crumpled film held between the jaws 13 and 14 therefore forms a sort of wick which remains assembled in a section 17 outside the jaws by means of the finger 16 as illustrated in FIG. 3.
  • the base of the reel 4 is located substantially at the level of the finger 16 and the jaws 13 and 14 so that the finger 16 forces the film to gather along its lower edge which forms the wick part 17 between this finger and the jaws 13,14.
  • FIGs 1 to 5 We have noticed in Figures 1 to 5 the presence of a clamp 18 which is carried by a support not shown integral with or coupled to the support of the load 1.
  • This clamp 18 comprises two plates 19 and 20 capable of being separated and brought closer vertically from each other. These plates form jaws for this clamp which is situated substantially at the level of the lower face 2 of the load by which the latter rests on its support.
  • the mechanism for controlling the opening and closing of the clamp 18 is conventional and will not be described.
  • the clamp 18 is on the side of the face 1a of the load when the latter is stopped and between this face and the frame part 7 which carries the carriage 8.
  • the automatic control of the machine which has carried out the descent according to arrows C, D and E of all the moving equipment described above is such that at the end of movement, as shown in FIG. 3, the section 17 of film shaped like a wick is located just opposite the two jaws 19 and 20 of the clamp 18 open.
  • a movement according to arrow F in FIG. 4 of the plate 10 in the direction of the carriage 8 introduces the part 17 of film in the form of a wick between the two jaws 19 and 20.
  • a detection of the presence of the film between them or a detection of the position of the moving element in this intermediate position makes it possible to control the closing of the clamp on the film.
  • the jaws 13 and 14 can open and move away from one another along the slides 12, the retraction of the deformable arm 9 can continue until the configuration of the machine is obtained shown in Figure 5.
  • the wrapped load can then be removed from the machine and a new load to be wrapped can be brought there.
  • the clamp 18 keeps the film 3 in position such that a relative movement of the load relative to the device for supplying the film causes the wrapping of the load to start.
  • the clamp 18 opens and the part of film which extends between the clamp 18 and the load 1 is released.
  • it may be advantageous to provide a vertical air blowing under the load which has the effect of raising this part of film released against the charge so that the next turns keep it there.
  • the clamp 18 is retractable between a high level or it is in the service position, that is to say capable of intercepting the film in the form of section of wick 17 and a low level located under the lower surface 2 of the load where it is retracted to allow for example the making of a very low turn to cover the lower edges of the load.
  • this table may include one or more other clamps 18 opposite each of the lateral faces of the load, which would make it possible to stop the wrapping opposite any which side and this depending on the position of the feed conveyors or load evacuation on the turntable. If the clamp 18 is not retractably mounted relative to the lower surface of the load, the number of clamps 18 should be limited to two arranged opposite two adjacent faces of the load to leave two access sides free and discharge of the load in front of these clamps.
  • FIG. 6 is the illustration of an industrial embodiment of a machine according to the invention, in which the load 1 rests on a turntable 21 while the device for supplying the film 3 and the carriage supporting the unfoldable arm, the plate 10 and the jaws 13 and 14 are mounted to slide vertically along a mast 22 secured to the frame of the machine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)

Abstract

In a machine for packaging a load (1) by means of streamers (hoop-casing), which includes a device for supplying a pre-stretched film (3) driven, with respect to a longitudinal axis (6) of the load (1) to be packaged, in a helical relative movement, the device for handling the free end of the film (3) between two hoop-casing cycles according to the invention includes a plate (10), for pressing the film (3) against the load (1), the length of which is at least equal to the width of the film (3) employed and, in the vicinity of one of the long edges of this plate (10), a pair (13, 14) of jaws which can move with respect to each other along this edge (10a) in order to crease (gather) and pinch between them the portion of film included between the plate applied to the load and the device for supplying the film. <IMAGE>

Description

La présente invention concerne une machine à banderoler une charge.The present invention relates to a load banding machine.

Les techniques d'emballage par banderolage ont pour fonction principale de donner à une charge formée par un empilement, la cohésion nécessaire pour préserver la stabilité de l'empilement lors de sa manutention.The main function of wrapping techniques by wrapping is to give a load formed by a stack the cohesion necessary to preserve the stability of the stack during its handling.

Le moyen utilisé pour assurer cette cohésion est un film étirable que l'on enroule à l'état étiré autour de l'empilement sous une certaine tension, faible, le film ayant tendance à se rétracter légèrement et à se plaquer sur la charge. On réalise en général au moins deux couches d'enroulement.The means used to ensure this cohesion is a stretch film which is wound in the stretched state around the stack under a certain tension, low, the film tending to shrink slightly and to be pressed on the load. In general, at least two winding layers are produced.

Parmi les machines utilisées pour la réalisation de ces emballages, on distingue celles dans lesquelles la charge tourne par rapport à un poste fixe de fourniture de film pré-étiré et celles dans lesquelles la charge est fixe, le poste de fourniture du film tournant autour de cette charge. Dans ces deux catégories le poste de fourniture de film comprend une bobine de film associée à un dispositif de pré-étirage et est mobile verticalement le long de son support (si l'axe de la charge est vertical) pour pouvoir balayer la totalité de la hauteur de la charge par un enroulement hélicoïdal.Among the machines used for producing these packages, there are those in which the load rotates relative to a fixed post for supplying pre-stretched film and those in which the load is fixed, the post for supplying film rotating around this charge. In these two categories the film supply station includes a film reel associated with a pre-stretching device and is movable vertically along its support (if the axis of the load is vertical) in order to be able to sweep the whole of the load height by helical winding.

Les principaux problèmes restant à résoudre pour ce type de machine concernent le début et la fin d'un cycle de banderolage. Il faut en effet au début de chaque cycle, rendre l'extrémité du film solidaire de la charge pour que le déroulement de ce film résulte du roulement relatif de rotation de la charge et du poste de fourniture de film. Il faut, en fin de cycle, couper le film en "attachant" l'une des extrémités à la charge tandis que l'autre extrémité est maintenue pour être ensuite rapportée sur la charge suivante.The main problems remaining to be solved for this type of machine relate to the beginning and the end of a wrapping cycle. It is indeed necessary at the start of each cycle to make the end of the film integral with the load so that the unwinding of this film results from the relative rotation of rotation of the load and the film supply station. It is necessary, at the end of the cycle, to cut the film by "attaching" one of the ends to the load while the other end is held in order to then be brought back to the next load.

La présente invention entend proposer un dispositif simple pour assurer ces fonctions de début et de fin de cycle de banderolage permettant en outre d'améliorer la qualité de la finition de l'emballage et la rapidité d'exécution des opérations de début et de fin de cycle.The present invention intends to propose a simple device for performing these functions at the start and end of the wrapping cycle, further making it possible to improve the quality of the finish of the packaging and the speed of execution of the cycle start and end operations.

A cet effet, l'invention a pour objet, dans une machine d'emballage par banderolage d'une charge comportant un dispositif de fourniture d'un film pré-étiré, animé par rapport à un axe longitudinal de la charge à emballer d'un mouvement relatif hélicoïdal, un dispositif de manutention de l'extrémité libre du film entre deux cycles de banderolage qui comporte une plaque d'appui du film contre la charge dont la longueur est au moins égale à la largeur du film mis en oeuvre et, à proximité de l'un des bords longs de cette plaque, une paire de mâchoires mobiles l'une par rapport à l'autre le long de ce bord pour froisser et pincer entre elles la portion de film comprise entre la plaque appliquée sur la charge et le dispositif de fourniture du film.To this end, the subject of the invention is, in a wrapping machine for wrapping a load comprising a device for supplying a pre-stretched film, animated with respect to a longitudinal axis of the load to be packed with a relative helical movement, a device for handling the free end of the film between two wrapping cycles which comprises a support plate for the film against the load, the length of which is at least equal to the width of the film used and, near one of the long edges of this plate, a pair of jaws movable relative to each other along this edge to crease and pinch between them the portion of film between the plate applied to the load and the film supply device.

Ces mâchoires solidaires déplaçables avec la plaque d'appui du film sur la charge en fin de banderolage présentent plusieurs avantages. On rappellera tout d'abord que cette plaque a pour fonction principale d'attacher l'extrémité du film à la charge. Cet attachement peut se réaliser soit par pression si le film est légèrement adhésif soit, le plus souvent, par thermo-scellage, la plaque étant chauffante. Le premier avantage des mâchoires solidaires et déplaçables avec la plaque réside dans le fait qu'elles sont situées immédiatement au voisinage de cette plaque et leur manoeuvre qui consiste à rassembler le film en une mèche, engendre sur ce film, en coopération avec l'un des bords de la plaque un effort de déchirement dont on peut profiter avantageusement pour obtenir une extrémité de film solidaire de la charge très près de la zone d'attachement. La finition de l'emballage est ainsi grandement améliorée car on supprime l'extrémité flottante du film qui, lors de la manutention ou du stockage, constitue une amorce de déroulement du film si cette extrémité vient à s'accrocher ou à être tirée intempestivement ou de manière malveillante.These integral jaws movable with the film support plate on the load at the end of wrapping have several advantages. It will be recalled first of all that the main function of this plate is to attach the end of the film to the load. This attachment can be achieved either by pressure if the film is slightly adhesive or, more often, by heat-sealing, the plate being heated. The first advantage of the jaws integral and movable with the plate lies in the fact that they are located immediately in the vicinity of this plate and their operation which consists in gathering the film in a wick, generates on this film, in cooperation with one from the edges of the plate, a tearing force which can advantageously be used to obtain an end of film secured to the load very close to the attachment zone. The finish of the packaging is thus greatly improved since the floating end of the film is eliminated, which, during handling or storage, constitutes a starting point for unwinding the film if this end comes to cling or to be pulled inadvertently or maliciously.

Le deuxième avantage de cette disposition réside dans la possibilité d'arrêter le banderolage en n'importe quel endroit sur la surface extérieure de la charge. En effet, dans les machines actuelles, l'arrêt du banderolage s'effectue le plus souvent en position basse, après avoir fait passer le film lors de la dernière spire, dans une pince fixe par rapport à la charge avec laquelle il pourra être maintenu après coupage.The second advantage of this provision is in the possibility of stopping the wrapping anywhere on the external surface of the load. Indeed, in current machines, the wrapping stops most often in the low position, after having passed the film during the last turn, in a clamp fixed relative to the load with which it can be maintained after cutting.

Un autre avantage de cette disposition réside dans le fait que le film lorsqu'il est pris entre les mâchoires, est conformé en une mèche qui résiste bien aux efforts de traction que l'on doit imprimer au film, notamment au début de chaque cycle de banderolage, ce qui permet de monter rapidemùent en vitesse sans craindre une rupture du film.Another advantage of this arrangement lies in the fact that the film when it is caught between the jaws, is shaped into a wick which withstands the tensile forces which must be printed on the film, in particular at the start of each cycle of wrapping, which allows to go up quickly in speed without fear of a rupture of the film.

Pour pouvoir appliquer la plaque d'appui contre la charge avec le film entre elles, la plaque et les mâchoires sont montées à l'extrémité d'un support mobile perpendiculairement à l'axe de la charge. En outre, afin de pouvoir choisir le niveau auquel on arrêtera le banderolage, le support est déplaçable le long d'un guide stationnaire parallèle à l'axe de la charge.To be able to apply the support plate against the load with the film between them, the plate and the jaws are mounted at the end of a movable support perpendicular to the axis of the load. In addition, in order to be able to choose the level at which the wrapping will be stopped, the support can be moved along a stationary guide parallel to the axis of the load.

Le dispositif comporte en outre un pince fixe par rapport à la charge située au niveau de l'une de ses extrémités longitudinales dont l'emplacement est, en fin de cycle de banderolage, situé entre le dispositif de fourniture du film et les mâchoires de pinçage du film, au voisinage du trajet de ces mâchoires lors de la manoeuvre du support par rapport à la charge. Grâce à cette disposition, il est possible de transférer l'extrémité du film froissé en forme de mèche depuis les mâchoires jusqu'à une pince fixe de sorte que le film délivré par le dispositif de fourniture de film pré-étiré soit prêt pour commencer un autre cycle de banderolage.The device further comprises a clamp fixed relative to the load located at one of its longitudinal ends, the location of which is, at the end of the wrapping cycle, located between the film supply device and the clamping jaws of the film, in the vicinity of the path of these jaws during the operation of the support relative to the load. With this arrangement, it is possible to transfer the end of the crumpled wick-like film from the jaws to a fixed clamp so that the film delivered by the pre-stretched film supply device is ready to start a another wrapping cycle.

On mentionnera enfin une caractéristique supplémentaire de l'invention qui réside dans la présence d'un moyen de déchirement du film situé entre les mâchoires et le bord de la plaque de pression. Ce moyen de déchirement ou plus précisément d'aide ou d'amorce à ce déchirement peut être une simple arête de la plaque ou un fil chaud disposé entre cette plaque et les mâchoires.Finally, an additional feature of the invention will be mentioned which resides in the presence of a means of tearing the film situated between the jaws and the edge of the pressure plate. This or more tearing means precisely to aid or initiate this tearing can be a simple edge of the plate or a hot wire placed between this plate and the jaws.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui en est faite ci-après, à titre d'exemple, et en référence aux dessins annexés parmi lesquels :

  • les figures 1 à 5 sont des schémas illustrant les différentes phases de fonctionnement de l'invention à la fin d'un cycle de banderolage d'une charge,
  • la figure 6 est une vue générale d'un dispositif de banderolage auquel sont appliqués les moyens de l'invention.
Other characteristics and advantages of the invention will emerge from the description given below, by way of example, and with reference to the attached drawings, in which:
  • FIGS. 1 to 5 are diagrams illustrating the different operating phases of the invention at the end of a wrapping cycle for a load,
  • Figure 6 is a general view of a wrapping device to which the means of the invention are applied.

Sur les figures 1 à 5, on a représenté une charge 1, ici en forme de parallélépipède rectangle reposant par sa face inférieure 2 sur un support non représenté dans une machine qui comporte un dispositif de fourniture d'un film 3 de banderolage pré-étiré, ce dispositif étant ici simplement représenté par une bobine 4 et un support 5 pour la bobine 4.In Figures 1 to 5, there is shown a load 1, here in the form of a rectangular parallelepiped resting by its lower face 2 on a support not shown in a machine which comprises a device for supplying a pre-stretched wrapping film 3 , this device here being simply represented by a coil 4 and a support 5 for the coil 4.

Comme rappelé ci-dessus, selon le type de machine à banderoler, soit la charge 1 tourne autour de son axe longitudinal 6 et le dispositif de fourniture du film 3 est stationnaire autour de cet axe 6 mais décrit un mouvement alternatif vertical le long du support 5, soit la charge 1 est stationnaire et le dispositif de fourniture du film 3 tourne autour de l'axe 6 tout en décrivant un mouvement vertical alternatif par rapport à la charge. C'est de toute façon cette rotation relative de la charge et du dispositif de fourniture du film 3 qui engendre le banderolage.As mentioned above, depending on the type of banding machine, either the load 1 rotates around its longitudinal axis 6 and the film supply device 3 is stationary around this axis 6 but describes a vertical reciprocating movement along the support 5, or the load 1 is stationary and the film supply device 3 rotates around the axis 6 while describing an alternating vertical movement relative to the load. It is in any case this relative rotation of the load and of the device for supplying the film 3 which generates the wrapping.

La machine de l'invention comporte un bâti fixe dont une partie 7 constitue une glissière pour un chariot 8 de support d'un bras dépliable 9 pour une plaque 10 destinée à appuyer le film 3 contre la charge 2 en fin de banderolage. La plaque 10 est associée par une liaison symbolisée en 11 à un jeu de glissières 12 pour des mâchoires 13 et 14 mobiles le long du jeu de glissières 12 qui est parallèle à l'un des bords 10a de la plaque 10. Le jeu de glissières 12 donc les mâchoires 13 et 14 sont situées entre la plaque 10, au voisinage immédiat de celle-ci, et le dispositif de fourniture du film 3.The machine of the invention comprises a fixed frame, a part 7 of which constitutes a slide for a carriage 8 for supporting a foldable arm 9 for a plate 10 intended to support the film 3 against the load 2 at the end of wrapping. The plate 10 is associated by a connection symbolized at 11 with a set of slides 12 for movable jaws 13 and 14 along the set of slides 12 which is parallel to one of the edges 10a of the plate 10. The set of slides 12 therefore the jaws 13 and 14 are located between the plate 10, in the immediate vicinity thereof, and the film supply device 3.

La mâchoire supérieure 14 est en outre équipée d'un étrier 15 en direction du dispositif de fourniture du film, cet étrier s'étendant au-dessus du plan de la mâchoire 14 et possédant à son extrémité libre sensiblement dans le plan de la mâchoire 14, un doigt 16 dont on expliquera la fonction ci-après.The upper jaw 14 is further equipped with a stirrup 15 in the direction of the film supply device, this stirrup extending above the plane of the jaw 14 and having at its free end substantially in the plane of the jaw 14 , a finger 16, the function of which will be explained below.

Lorsque le banderolage est terminé, la charge 1 présente sa face la en regard de la partie de bâti 7. L'automatisme de commande de la machine ajuste la hauteur du chariot 8 et déplie le bras 9 pour que la plaque 10 vienne s'appuyer sur la face la en plaquant le film 3 sur cette face la comme illustré par la flèche A. Préalablement à ce mouvement, les mâchoires 13 et 14 ont été écartées l'une de l'autre grâce à des moyens de manoeuvre du genre vérins, le long des glissières 12, la distance les séparant lorsqu'elles sont écartées étant supérieure à la largeur du film 3 appliqué sur la charge 1.When the wrapping is finished, the load 1 has its face opposite the frame part 7. The automatic control of the machine adjusts the height of the carriage 8 and unfolds the arm 9 so that the plate 10 comes to bear on the face la by pressing the film 3 on this face la as illustrated by the arrow A. Prior to this movement, the jaws 13 and 14 were separated from each other by means of actuators of the jack type, along the slides 12, the distance separating them when they are spaced being greater than the width of the film 3 applied to the load 1.

Comme représenté à la figure 2, les mâchoires 13 et 14, lorsque la plaque 10 est appuyée sur la face 1a de la charge, sont rapprochées l'une de l'autre selon les flèches B.As shown in FIG. 2, the jaws 13 and 14, when the plate 10 is pressed on the face 1a of the load, are brought closer to one another according to the arrows B.

Dans un mode préféré de réalisation, chacune des mâchoires parcourt sensiblement la moitié de la distance qui la sépare de l'autre, mais ce n'est pas sortir du cadre de l'invention que de prévoir une mâchoire par exemple inférieure 13 fixe et une mâchoire 14 supérieure mobile qui parcourt la totalité de la longueur des glissières 12. En rapprochant les mâchoires l'une de l'autre, on froisse le film 3 entre elles et on provoque une traction de celui-ci qui, dans le cas de figure, engendre sa rupture au droit du bord 10a de la plaque 10. On peut en effet avoir prévu de réaliser ce bord 10a de manière qu'il présente une arête relativement dure et vive pour qu'au contact de cette arête, lors du froissement du film par les mâchoires, il se produise une amorce de rupture et un déchirement du film.In a preferred embodiment, each of the jaws travels substantially half the distance which separates it from the other, but it is not departing from the scope of the invention to provide a fixed lower jaw 13 for example and a movable upper jaw 14 which covers the entire length of the slides 12. By bringing the jaws closer to one another, the film 3 is crumpled together and a traction is exerted on it which, in the case of figure , generates its rupture with the right of edge 10a of the plate 10. It may indeed have been planned to produce this edge 10a so that it has a relatively hard and sharp edge so that in contact with this edge, when the film crumples by the jaws, it becomes produce an initiation of rupture and a tearing of the film.

On rappellera que la plaque 10 peut être une plaque chauffante de thermo-scellage de la dernière spire du film sur la charge.It will be recalled that the plate 10 may be a heat-sealing heat-sealing plate for the last turn of the film on the load.

Le film froissé maintenu entre les mâchoires 13 et 14 forme donc une sorte de mèche qui reste rassemblée en un tronçon 17 à l'extérieur des mâchoires grâce au doigt 16 comme illustré par la figure 3.The crumpled film held between the jaws 13 and 14 therefore forms a sort of wick which remains assembled in a section 17 outside the jaws by means of the finger 16 as illustrated in FIG. 3.

En effet, l'état de la machine représentée à cette figure résulte d'une part de l'abaissement simultané des deux mâchoires 13 et 14 serrées en partie inférieure des glissières 12, comme l'indique la flèche C, et d'autre part la descente générale du chariot 8 et de la bobine 4 comme indiqué par les flèches D et E. Bien entendu avant cette opération de descente le long de la face 1a de la charge, il y a eu un léger décollement de la plaque 10 par rapport à cette face par rétraction du bras dépliable 9 de manière à ne pas interférer avec le banderolage recouvrant la face 1a de la charge.Indeed, the state of the machine shown in this figure results on the one hand from the simultaneous lowering of the two jaws 13 and 14 clamped in the lower part of the slides 12, as indicated by arrow C, and on the other hand the general descent of the carriage 8 and of the coil 4 as indicated by the arrows D and E. Of course before this operation of descent along the face 1a of the load, there was a slight detachment of the plate 10 relative to this face by retraction of the unfoldable arm 9 so as not to interfere with the wrapping covering the face 1a of the load.

Dans l'état représenté à la figure 3, la base de la bobine 4 se trouve sensiblement au niveau du doigt 16 et des mâchoires 13 et 14 si bien que le doigt 16 contraint le film à se rassembler le long de son bord inférieur ce qui forme la partie de mèche 17 entre ce doigt et les mâchoires 13,14.In the state shown in FIG. 3, the base of the reel 4 is located substantially at the level of the finger 16 and the jaws 13 and 14 so that the finger 16 forces the film to gather along its lower edge which forms the wick part 17 between this finger and the jaws 13,14.

On aura remarqué sur les figures 1 à 5 la présence d'une pince 18 qui est portée par un support non représenté solidaire ou accouplé au support de la charge 1. Cette pince 18 comporte deux plaquettes 19 et 20 susceptibles d'être écartées et rapprochées verticalement l'une de l'autre. Ces plaquettes forment des mâchoires pour cette pince qui se situe sensiblement au niveau de la face 2 inférieure de la charge par laquelle cette dernière repose sur son support. Le mécanisme de commande de l'ouverture et de fermeture de la pince 18 est classique et ne sera pas décrit. La pince 18 se trouve du côté de la face la de la charge lorsque celle-ci est arrêtée et entre cette face et la partie de bâti 7 qui porte le chariot 8.We have noticed in Figures 1 to 5 the presence of a clamp 18 which is carried by a support not shown integral with or coupled to the support of the load 1. This clamp 18 comprises two plates 19 and 20 capable of being separated and brought closer vertically from each other. These plates form jaws for this clamp which is situated substantially at the level of the lower face 2 of the load by which the latter rests on its support. The mechanism for controlling the opening and closing of the clamp 18 is conventional and will not be described. The clamp 18 is on the side of the face 1a of the load when the latter is stopped and between this face and the frame part 7 which carries the carriage 8.

L'automatisme de commande de la machine qui a réalisé la descente selon les flèches C, D et E de tout l'équipage mobile décrit ci-dessus est tel qu'en fin de mouvement, comme représenté à la figure 3, le tronçon 17 de film conformé en mèche se trouve juste en regard des deux mâchoires 19 et 20 de la pince 18 ouverte. Un mouvement selon la flèche F de la figure 4 de la plaque 10 en direction du chariot 8 introduit la partie 17 de film en forme de mèche entre les deux mâchoires 19 et 20. Une détection de la présence du film entre elles ou une détection de la position de l'équipage mobile dans cette position intermédiaire permet de commander la fermeture de la pince sur le film. Lorsque cette fermeture est assurée, les mâchoires 13 et 14 peuvent s'ouvrir et s'éloigner l'une de l'autre le long des glissières 12, la rétraction du bras déformable 9 peut se poursuivre jusqu'à obtenir la configuration de la machine représentée à la figure 5.The automatic control of the machine which has carried out the descent according to arrows C, D and E of all the moving equipment described above is such that at the end of movement, as shown in FIG. 3, the section 17 of film shaped like a wick is located just opposite the two jaws 19 and 20 of the clamp 18 open. A movement according to arrow F in FIG. 4 of the plate 10 in the direction of the carriage 8 introduces the part 17 of film in the form of a wick between the two jaws 19 and 20. A detection of the presence of the film between them or a detection of the position of the moving element in this intermediate position makes it possible to control the closing of the clamp on the film. When this closure is ensured, the jaws 13 and 14 can open and move away from one another along the slides 12, the retraction of the deformable arm 9 can continue until the configuration of the machine is obtained shown in Figure 5.

La charge banderolée peut alors être extraite de la machine et une charge nouvelle à banderoler peut y être apportée. On constate en effet sur la figure 5 que la pince 18 maintient le film 3 en position telle qu'un mouvement relatif de la charge par rapport au dispositif de fourniture du film entraîne le début du banderolage de la charge. Lorsqu'un ou deux tours d'hélice sont réalisés, la pince 18 s'ouvre et la partie de film qui s'étend entre la pince 18 et la charge 1 est libérée. Pour éviter que cette partie de film ne pende à la fin du banderolage, il peut être avantageux de prévoir un soufflage d'air vertical sous la charge qui a pour effet de remonter cette partie de film libérée contre la charge de sorte que les spires suivantes viennent l'y maintenir.The wrapped load can then be removed from the machine and a new load to be wrapped can be brought there. In fact, it can be seen in FIG. 5 that the clamp 18 keeps the film 3 in position such that a relative movement of the load relative to the device for supplying the film causes the wrapping of the load to start. When one or two propeller turns are performed, the clamp 18 opens and the part of film which extends between the clamp 18 and the load 1 is released. To prevent this part of film from hanging at the end of the wrapping, it may be advantageous to provide a vertical air blowing under the load which has the effect of raising this part of film released against the charge so that the next turns keep it there.

Dans des variantes de réalisation de l'invention non représentées, on peut également prévoir que la pince 18 soit escamotable entre un niveau haut ou elle est en position de service, c'est-à-dire capable d'intercepter le film en forme de tronçon de mèche 17 et un niveau bas situé sous la surface 2 inférieure de la charge où elle est escamotée pour permettre par exemple la confection d'une spire très basse devant recouvrir les arêtes inférieures de la charge.In alternative embodiments of the invention not shown, it can also be provided that the clamp 18 is retractable between a high level or it is in the service position, that is to say capable of intercepting the film in the form of section of wick 17 and a low level located under the lower surface 2 of the load where it is retracted to allow for example the making of a very low turn to cover the lower edges of the load.

De même et pour le cas où la charge reposerait sur une table tournante, cette table peut comporter une ou plusieurs autres pinces 18 en face de chacune des faces latérales de la charge, ce qui permettrait d'arrêter le banderolage en regard de n'importe quelle face et ce en fonction de la position des transporteurs d'amenée ou d'évacuation de la charge sur la table tournante. Si la pince 18 n'est pas montée de manière escamotable par rapport à la surface inférieure de la charge, il faudra limiter le nombre des pinces 18 à deux disposées en face de deux faces adjacentes de la charge pour laisser libres deux côtés d'accès et d'évacuation de la charge en face de ces pinces.Similarly, and in the case where the load rests on a rotating table, this table may include one or more other clamps 18 opposite each of the lateral faces of the load, which would make it possible to stop the wrapping opposite any which side and this depending on the position of the feed conveyors or load evacuation on the turntable. If the clamp 18 is not retractably mounted relative to the lower surface of the load, the number of clamps 18 should be limited to two arranged opposite two adjacent faces of the load to leave two access sides free and discharge of the load in front of these clamps.

La figure 6 est l'illustration d'une réalisation industrielle d'une machine conforme à l'invention, dans laquelle la charge 1 repose sur un plateau tournant 21 tandis que le dispositif de fourniture du film 3 et le chariot supportant le bras dépliable, la plaque 10 et les mâchoires 13 et 14, sont montés coulissant verticalement le long d'un mât 22 solidaire du bâti de la machine.FIG. 6 is the illustration of an industrial embodiment of a machine according to the invention, in which the load 1 rests on a turntable 21 while the device for supplying the film 3 and the carriage supporting the unfoldable arm, the plate 10 and the jaws 13 and 14 are mounted to slide vertically along a mast 22 secured to the frame of the machine.

On notera sur cette figure la présence entre la plaque 10 et les glissières 12 de coulissement des mâchoires 13 et 14, la présence d'un fil chauffant 23 à proximité duquel les mâchoires 13 et 14 peuvent se rapprocher, ce fil chauffant constituant, lorsque la plaque 10 est appuyée contre l'une des faces de la charge 1, un moyen d'amorce de rupture du film qui se déchirera plus facilement lorsque les mâchoires 13 et 14 se rapprocheront l'une de l'autre. Ce fil chaud peut être remplacé dans une variante non représentée de l'invention par une arête vive qui prend appui sur le fil et qui peut constituer une sorte de lame fixe pour la découpe de ce film lorsque les mâchoires 13 et 14 se rapprochent. On retrouve bien entendu sur cette figure 6 tous les éléments déjà décrits avec les mêmes références.It will be noted in this figure the presence between the plate 10 and the slides 12 for sliding the jaws 13 and 14, the presence of a heating wire 23 near which the jaws 13 and 14 can approach, this heating wire constituting, when the plate 10 is pressed against one of the faces of the load 1, a means of initiating rupture of the film which will tear more easily when the jaws 13 and 14 approach each other. This hot wire can be replaced in a variant not shown of the invention by a sharp edge which bears on the wire and which can constitute a sort of fixed blade for cutting this film when the jaws 13 and 14 come together. We naturally find in this figure 6 all the elements already described with the same references.

Claims (8)

Dans une machine d'emballage par banderolage d'une charge (1) comportant un dispositif de fourniture d'un film (3) pré-étiré animé par rapport à un axe (6) longitudinal de la charge (1) à emballer d'un mouvement relatif hélicoïdal, dispositif de manutention de l'extrémité libre du film (3) entre deux cycles de banderolage, caractérisé en ce qu'il comporte une plaque d'appui (10) du film (3) contre la charge (1) dont la longueur est au moins égale à la largeur du film (3) mis en oeuvre et à proximité de l'un des bords longs de cette plaque (3), une paire (13, 14) de mâchoires mobiles l'une par rapport à l'autre le long de ce bord (10a) pour froisser et pincer entre elles la portion de film comprise entre la plaque appliquée sur la charge et le dispositif de fourniture du film.In a wrapping machine for wrapping a load (1) comprising a device for supplying a pre-stretched film (3) animated with respect to a longitudinal axis (6) of the load (1) to be wrapped a relative helical movement, device for handling the free end of the film (3) between two wrapping cycles, characterized in that it comprises a support plate (10) of the film (3) against the load (1) whose length is at least equal to the width of the film (3) used and near one of the long edges of this plate (3), a pair (13, 14) of jaws movable relative to one another to the other along this edge (10a) to crease and pinch between them the portion of film included between the plate applied to the load and the film supply device. Dispositif selon la revendication 1, caractérisé en ce que la plaque (10) et les mâchoires (13, 14) sont montées à l'extrémité d'un support mobile (9) perpendiculairement à l'axe (6) de la charge.Device according to claim 1, characterized in that the plate (10) and the jaws (13, 14) are mounted at the end of a mobile support (9) perpendicular to the axis (6) of the load. Dispositif selon la revendication 2, caractérisé en ce que le support (9) est déplaçable le long d'un guide stationnaire (7, 22) parallèle à l'axe (6) de la charge.Device according to claim 2, characterized in that the support (9) is movable along a stationary guide (7, 22) parallel to the axis (6) of the load. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte une pince (18) fixe par rapport à la charge (1) située au niveau de l'une de ses extrémités longitudinales (2), dont l'emplacement est, en fin de cycle de banderolage, situé entre le dispositif de fourniture du film (3) et les mâchoires (13, 14) de pinçage du film, au voisinage du trajet de ces mâchoires lors de la manoeuvre du support (9) par rapport à la charge (1).Device according to any one of the preceding claims, characterized in that it comprises a clamp (18) fixed relative to the load (1) located at one of its longitudinal ends (2), the location of which is, at the end of the wrapping cycle, located between the film supply device (3) and the film clamping jaws (13, 14), in the vicinity of the path of these jaws during the operation of the support (9) by load ratio (1). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend entre les mâchoires (12, 13) et le bord (10a) de la plaque de pression, un moyen (23) de déchirement du film.Device according to any one of the preceding claims, characterized in that it comprises, between the jaws (12, 13) and the edge (10a) of the pressure plate, means (23) for tearing the film. Dispositif selon la revendication 5, caractérisé en ce que le moyen de déchirement est un fil chaud (23) entre la plaque (10) et les mâchoires (12, 13).Device according to claim 5, characterized in that the tearing means is a hot wire (23) between the plate (10) and the jaws (12, 13). Dispositif selon la revendication 5, caractérisé en ce que ce moyen de déchirement est une arête stationnaire (10a) entre la plaque et les mâchoires.Device according to claim 5, characterized in that this tearing means is a stationary edge (10a) between the plate and the jaws. Dispositif selon la revendication 4, caractérisé en ce que l'une au moins (14) des mâchoires est équipée du côté du dispositif de fourniture du film (3) d'un doigt (16) de regroupement du film en une mèche (17).Device according to claim 4, characterized in that at least one (14) of the jaws is equipped on the side of the film supply device (3) with a finger (16) for grouping the film into a wick (17) .
EP94401395A 1993-06-25 1994-06-22 Device for handling and holding the free end of a film in a streamer machine Withdrawn EP0630813A1 (en)

Applications Claiming Priority (2)

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FR9307759A FR2706859B1 (en) 1993-06-25 1993-06-25
FR9307759 1993-06-25

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CN111547288B (en) * 2020-05-18 2020-12-22 杭州翔毅科技有限公司 A carton packing seals membrane equipment for in intelligence commodity circulation

Also Published As

Publication number Publication date
FR2706859B1 (en) 1995-09-29
US5452566A (en) 1995-09-26
FR2706859A1 (en) 1994-12-30

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