FR2606322A1 - Portable machine for bonding (welding) thermoplastic films or sheets - Google Patents

Portable machine for bonding (welding) thermoplastic films or sheets Download PDF

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Publication number
FR2606322A1
FR2606322A1 FR8615511A FR8615511A FR2606322A1 FR 2606322 A1 FR2606322 A1 FR 2606322A1 FR 8615511 A FR8615511 A FR 8615511A FR 8615511 A FR8615511 A FR 8615511A FR 2606322 A1 FR2606322 A1 FR 2606322A1
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France
Prior art keywords
anvil
welding
sonotrode
arm
films
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Granted
Application number
FR8615511A
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French (fr)
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FR2606322B1 (en
Inventor
Alain J B Boivin
Georges A Callivrousis
Gerard R Philippart
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SEIMAP
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SEIMAP
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Publication of FR2606322B1 publication Critical patent/FR2606322B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8244—Actuating mechanisms magnetically driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8324—Joining or pressing tools pivoting around one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/861—Hand-held tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8225—Crank mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives

Landscapes

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

Abstract

The invention relates to a portable pair of tongs for bonding (welding) sheets or films made of thermoplastic, in which the energy necessary for producing the bond (weld) is supplied by a device 2 vibrating at ultrasonic frequency. The device 2 vibrating at ultrasonic frequency preferably includes a sonotrode 22, the active end of which is applied, with pressure, against the said films or sheets 10 which are placed in a superposed position, for example by means of electromagnetic members. Such a pair of tongs can be used especially in the packing and packaging field.

Description

MACHINE PORTATIVE DE SOUDAGE DE FILMS OU FEUILLES DE
MATIERE TIIERMO-PLASTIQUE
La présente invention concerne une machine portative de soudage de films ou feuilles de matière thermo-plastique, utilisable notamment dans le domaine de l'emballage ou du conditionnement.PORTABLE FILM OR SHEET WELDING MACHINE
TIIERMO-PLASTIC MATERIAL
The present invention relates to a portable machine for welding films or sheets of thermoplastic material, usable in particular in the field of packaging.

On connaît des machines de soudage de ce type comprenant deux mâchoires dont l'une au moins comporte un ruban ou fil chauffant qui provoque par fusion la soudure de films plastiques pressés entre lesdites mâchoires. Cependant, les soudures réalisées par ces machines sont rarement homogènes et l'étanchéité des emballages réalisés par ce moyen n'est pas assurée totalement et systématiquement. De plus la chaleur nécessaire à la fusion étant couramment transmise d'un seul coté des éléments à souder, l'une des feuilles est soumise à une forte température, alors que la seconde risque de ne pas atteindre une température suffisante de fusion pour réaliser une véritable soudure. On n'obtient alors en fait qu'un collage dont la résistance n'est pas toujours suffisante. Welding machines of this type are known, comprising two jaws, at least one of which includes a heating tape or wire which causes the welding of pressed plastic films between said jaws by fusion. However, the welds produced by these machines are rarely homogeneous and the sealing of the packages produced by this means is not completely and systematically ensured. In addition, the heat necessary for melting is commonly transmitted on one side of the elements to be welded, one of the sheets is subjected to a high temperature, while the second risks not reaching a sufficient melting temperature to achieve a real welding. In fact, only a bond is obtained, the resistance of which is not always sufficient.

Il existe par ailleurs des machines de soudage par ultrasons qui permettent de réaliser des soudures de meilleure qualité. Mais du fait des appareillages nécessaires à la production d'ultrasons, ces machines sont généralement encombrantes et nécessitent souvent, pour l'alimentation des organes créant la pression de soudage nécessaire entre les films juxtaposés, couramment constitués par des vérins à fluide, une source de fluide sous pression et des tuyauteries d'alimentation. De ce fait, ces machines sont à poste fixe et ne présentent donc pas une grande souplesse d'utilisation. De plus, pour réaliser des soudures sur des objets de grandes dimensions, il est nécessaire de manipuler ces objets pour les positionner sur la machine, ce qui, outre l'inconvénient résultant de la manipulation de pièces encombrantes, entraîne des dimensions également importantes pour ladite machine. There are also ultrasonic welding machines that allow better quality welds. However, because of the equipment necessary for the production of ultrasound, these machines are generally bulky and often require, for the supply of the organs creating the welding pressure necessary between the juxtaposed films, commonly constituted by fluid jacks, a source of pressurized fluid and supply piping. Therefore, these machines are stationary and therefore do not have great flexibility of use. In addition, to perform welds on large objects, it is necessary to manipulate these objects to position them on the machine, which, in addition to the disadvantage resulting from the handling of bulky parts, results in dimensions that are also important for said machine.

Un but de la présente invention est de proposer une machine de soudage de films ou feuilles de matière thermo-plastique superposés (feuilles planes ou thermo-formées > , facilement manipulable et permettant de réaliser des soudures de bonne qualité et en toute position, quelles que soient les dimensions et l'encombrement des objets ou produits sur lesquels on intervient. An object of the present invention is to provide a machine for welding superimposed films or sheets of thermoplastic material (flat or thermoformed sheets>, which is easy to handle and which makes it possible to produce good quality welds in any position, whatever are the dimensions and dimensions of the objects or products on which we intervene.

Un autre but est de proposer une machine dont l'utilisation soit le plus possible simpl.ifiée.  Another aim is to provide a machine whose use is as simple as possible.

Pour atteindre ces buts, la présente invention consiste en une pince portative de soudage de feuilles ou films en matière thermo-plastique (feuilles planes ou thermo-formées), ladite pince étant caractérisée en ce que l'énergie nécessaire à la réalisation de la soudure est fournie par un dispositif vibrant à fréquence ultrasonique, ce dispositif comportant essentiellement une sonotrode dont l'extrémité active est appliquée en pression sur lesdits films ou feuilles placés en position superposée. To achieve these goals, the present invention consists of a portable clamp for welding sheets or films of thermo-plastic material (flat or thermoformed sheets), said clamp being characterized in that the energy necessary for carrying out the welding is provided by an ultrasonic frequency vibrating device, this device essentially comprising a sonotrode whose active end is applied under pressure to said films or sheets placed in superimposed position.

Grâce au système de soudage par ultrasons, les soudures réalisées par cet outil sont de bonne qualité et assurent la résistance et l'étanchéité de l'assemblage. De plus, cet outil étant portatif, on peut effectuer des soudures en toutes positions, en le déplaçant autour des pièces à souder, comme si on se servait d'une agrafeuse de modèle courant. Thanks to the ultrasonic welding system, the welds made by this tool are of good quality and ensure the strength and tightness of the assembly. In addition, this tool being portable, it is possible to carry out welds in any position, by moving it around the parts to be welded, as if one were using a stapler of current model.

Selon une disposition particulière de l'invention, la pince comprend un corps sur lequel est fixé le dispositif vibrant, un bras articulé sur Ledit corps et portant une enclume en regard de l'extrémité de la sonotrode, et des moyens de commande du mouvement du bras pour exercer la pression de soudage en serrant les films à souder entre la sonotrode et l'enclume.  According to a particular arrangement of the invention, the clamp comprises a body on which the vibrating device is fixed, an arm articulated on said body and carrying an anvil facing the end of the sonotrode, and means for controlling the movement of the arm to exert the welding pressure by clamping the films to be welded between the sonotrode and the anvil.

Un inconvénient important des machines de soudage par ultrasons connues réside dans l'encombrement des moyens d'approche de L'enclume vers la sonotrode et de mise en pression. Ceci résulte du fait que ces moyens remplissent successivement deux fonctions : l'une d'approche, qui ne nécessite que peu d'efforts mais par contre un déplacement relativement important nécessaire pour obtenir un espacement entre sonotrode et enclume suffisant pour y placer les pièces à souder, l'autre de mise en pression pour laquelle il n'y a pratiquement pas de déplacement mais où il faut exercer un effort plus important pendant la soudure. A major drawback of known ultrasonic welding machines lies in the size of the means for approaching the anvil towards the sonotrode and for pressurizing. This results from the fact that these means successively fulfill two functions: one of approach, which requires only little effort but on the other hand a relatively large displacement necessary to obtain a spacing between sonotrode and anvil sufficient to place the parts therein. weld, the other pressurizing for which there is practically no displacement but where it is necessary to exert a greater force during the welding.

Généralement, un seul organe assure ces deux fonctions, ce qui conduit à utiliser un dispositif capable d'effectuer à la fois un grand déplacement et d'exercer un effort important. Un tel dispositif est nécessairement encombrant et donc gênant pour une machine dont la petite taille est souhaitée. Generally, a single member performs these two functions, which leads to the use of a device capable of carrying out both a large displacement and of exerting significant effort. Such a device is necessarily bulky and therefore inconvenient for a machine whose small size is desired.

Selon une autre disposition particulière de l'invention où lesdits organes de commande du bras sont électromagnétiques, il est proposé que la pince comporte un électro-aimant à noyau plongeur pour effectuer l'approche de l'enclume vers l'extrémité active de la sonotrode et une ventouse magnétique pour assurer la pression de soudage. According to another particular arrangement of the invention in which the said control members of the arm are electromagnetic, it is proposed that the clamp comprises an electromagnet with a plunger core to effect the approach of the anvil towards the active end of the sonotrode and a magnetic suction cup to ensure the welding pressure.

Grâce à cette particularité, les deux fonctions précitées sont dissociées et les organes électromagnétiques de commande du bras peuvent être de dimension réduite pour diminuer l'encombrement de la pince. Thanks to this feature, the two aforementioned functions are dissociated and the electromagnetic control members of the arm can be reduced in size to reduce the size of the clamp.

D'autres caractéristiques et avantages apparaitront à la lecture de la description qui va être faite d'une pince conforme à l'invention. Other characteristics and advantages will appear on reading the description which will be made of pliers according to the invention.

On se reportera à l'unique figure annexée qui représente une telle pince, montrant la disposition particulière des organes fonctionnels.  Reference will be made to the single appended figure which represents such a clamp, showing the particular arrangement of the functional organs.

La pince portative de soudage par ultrasons comporte un corps 1 dans lequel est fixé le dispositif vibrant 2. Celui-ci est constitué d'un convertisseur électro-acoustique 21, et d'une sonotrode 22 à laquelle le convertisseur 21 transmet les vibrations ultrasoniques qui peuvent être amplifiées par un résonateur non représenté. Cet ensemble est de type connu et déjà utilisé dans des machines de plus grandes dimensions. The portable ultrasonic welding clamp comprises a body 1 in which the vibrating device 2 is fixed. This consists of an electro-acoustic converter 21, and a sonotrode 22 to which the converter 21 transmits the ultrasonic vibrations which can be amplified by a resonator not shown. This assembly is of known type and already used in larger machines.

Il est seulement précisé que l'ensemble vibrant 2 est fixé dans le corps 1 au niveau du convertisseur 21 pour permettre ta libre vibration de la sonotrode 22 dont l'extrémité 24 dépasse en-dessous du corps 1.It is only specified that the vibrating assembly 2 is fixed in the body 1 at the level of the converter 21 to allow the free vibration of the sonotrode 22, the end 24 of which protrudes below the body 1.

Celui-ci se prolonge, dans une direction sensiblement perpendiculaire à l'axe longitudinal du dispositif vibrant 2, par un carter 11 vers l'extrémité duquel s'articule sur un axe 12 un bras 13. Le bras 13 s'étend en-dessous du carter 11 en direction de l'extrémité 24 de la sonotrode et porte, en regard de ladite extrémité 24, une enclume 14. This is extended, in a direction substantially perpendicular to the longitudinal axis of the vibrating device 2, by a casing 11 towards the end of which an arm 13 is articulated on an axis 12. The arm 13 extends below of the casing 11 in the direction of the end 24 of the horn and carries, opposite said end 24, an anvil 14.

L'enclume 14 est en fait fixée sur un coulisseau 15 rétractable dans le bras 13 et guidé sur celui-ci par des rainures 16. Il est ainsi possible de reculer l'enclume vers l'axe d'articulation 12 de manière à libérer l'espace en face de l'extrémité inférieure 24 de la sonotrode 22 pour intervenir sur celle-ci, par exemple pour la démonter ou la remplacer, ou pour réaliser des opérations spéciales de soudage sans utiliser l'enclume 14, notamment pour souder des produits autres que des films. Selon une autre réalisation de l'invention, L'enclume peut être simplement amovible. The anvil 14 is in fact fixed on a slide 15 retractable in the arm 13 and guided on the latter by grooves 16. It is thus possible to retract the anvil towards the articulation axis 12 so as to release the space in front of the lower end 24 of the sonotrode 22 to intervene thereon, for example to disassemble or replace it, or to carry out special welding operations without using the anvil 14, in particular for welding products other than movies. According to another embodiment of the invention, the anvil can be simply removable.

Le bras 13 est par ailleurs réalisé et monté de façon à avoir un débattement limité. Ainsi qu'on le voit sur le dessin, l'extrémité du bras 13 opposée à l'enclume 14 butte en 17 sur l'extrémité du carter 11, ce qui limite l'éloignement entre l'enclume 14 et l'extrémité 24 de la sonotrode 22 tout en gardant un espacement suffisant pour y introduire aisément les films ou feuilles à souder 10. The arm 13 is also produced and mounted so as to have a limited clearance. As can be seen in the drawing, the end of the arm 13 opposite the anvil 14 abuts at 17 on the end of the casing 11, which limits the distance between the anvil 14 and the end 24 of the sonotrode 22 while keeping sufficient spacing to easily introduce therein the films or sheets to be welded 10.

Par ailleurs, le bras 13 comporte, à une distance intermédiaire entre l'axe d'articulation 12 et la sonotrode 22, une partie en matériau magnétique dont la face supérieure plane 18 se trouve en regard d'une ventouse magnétique 31 fixée dans le carter 11. La position relative de la ventouse 31 et de la surface 18 est telle que, lorsque la pince est en position de repos, c'est-à-dire lorsque la sonotrode 22 et l'enclume 14 sont éloignées l'une de l'autre, il existe un certain espacement entre ladite ventouse 31 et ladite face 18, et que, lorsque la pince est en service, sonotrode et enclume étant alors rapprochées en position de soudage, ladite face 18 est au contact de ladite ventouse 31. Furthermore, the arm 13 comprises, at an intermediate distance between the articulation axis 12 and the sonotrode 22, a part made of magnetic material, the planar upper face 18 of which is opposite a magnetic suction cup 31 fixed in the casing. 11. The relative position of the suction cup 31 and the surface 18 is such that, when the clamp is in the rest position, that is to say when the sonotrode 22 and the anvil 14 are distant from one another. 'other, there is a certain spacing between said suction cup 31 and said face 18, and that, when the clamp is in service, the horn and anvil then being brought together in the welding position, said face 18 is in contact with said suction cup 31.

Des moyens de réglage de l'entrefer entre l'extrémité 24 de la sonotrode 22 et l'enclume, lorsque la face 18 touche la ventouse 31, sont également prévus et agissent soit sur l'enclume, soit sur la position axiale du dispositif vibrant 2 par rapport au corps 1. Means for adjusting the air gap between the end 24 of the sonotrode 22 and the anvil, when the face 18 touches the suction cup 31, are also provided and act either on the anvil or on the axial position of the vibrating device 2 relative to body 1.

Le carter 11 contient également un électro-aimant du type à noyau plongeur 32, fixé sur ledit carter 11 et dont l'extrémité de la tige mobile 33 s'articule sur un levier 19 solidaire du bras 13, de sorte qu'un déplacement de la tige 33 provoque le pivotement du bras 13 autour de l'axe 12. The casing 11 also contains an electromagnet of the plunger core type 32, fixed on said casing 11 and the end of the movable rod 33 of which is articulated on a lever 19 integral with the arm 13, so that a displacement of the rod 33 causes the arm 13 to pivot about the axis 12.

Une poignée 35 est solidaire du corps 1 et comporte des moyens de commande tels qu'interrupteurs ou boutons-poussoirs (non représentés) pour alimenter l'électro-aimant 32, la ventouse magnétique 31 et le convertisseur électro-acoustique 21. A handle 35 is integral with the body 1 and comprises control means such as switches or push-buttons (not shown) for supplying the electromagnet 32, the magnetic suction cup 31 and the electro-acoustic converter 21.

On remarquera que la pince selon le mode préféré de réalisation représenté sur le dessin annexé a la forme générale d'une agrafeuse de type courant particulièrement adaptée à des utilisations similaires à celles de ladite agrafeuse mais assurant, entre des feuilles de matière plastique, des liaisons de nettement meilleure qualité. It will be noted that the pliers according to the preferred embodiment shown in the appended drawing has the general shape of a stapler of common type particularly suitable for uses similar to those of said stapler but ensuring, between sheets of plastic material, connections of much better quality.

L'invention n'est pas limitée à la pince précédemment décrite à titre d'exemple. En particulier, le principe nouveau dissociant les fonctions des organes de commande du bras, bien que particulièrement adapté à des machines portatives, peut être mis en oeuvre sur d'autres machines de soudage par ultrasons de films de matière thermo-plastique du type comportant un ensemble vibrant composé d'une sonotrode, d'un convertisseur électro-acoustique et dtun résonateur (facultatif selon le cas) et une enclume mobile susceptible d'exercer une pression sur les films de matières plastiques placés en vue de leur soudage entre l'extrémité de la sonotrode et ladite enclume. Dans le cadre de l'invention, cette machine est caractérisée en ce que l'enclume est montée vers l'extrémité d'un levier pivotant actionné par un.  The invention is not limited to the clamp previously described by way of example. In particular, the new principle dissociating the functions of the control members of the arm, although particularly suitable for portable machines, can be implemented on other machines for ultrasonic welding of films of thermoplastic material of the type comprising a vibrating assembly composed of a sonotrode, an electro-acoustic converter and a resonator (optional depending on the case) and a movable anvil capable of exerting pressure on the plastic films placed for their welding between the end of the sonotrode and said anvil. In the context of the invention, this machine is characterized in that the anvil is mounted towards the end of a pivoting lever actuated by a.

électro-aimant du type à noyau plongeur et en ce qu'une ventouse magnétique assure le maintien en pression de l'enclume pendant le soudage. electromagnet of the plunger core type and in that a magnetic suction cup maintains the pressure of the anvil during welding.

Selon une réalisation particulière de l'invention, appliquée à une telle machine, le levier est articulé sur un carter supportant l'ensemble vibrant et la ventouse est liée audit carter en regard d'une partie en matériau magnétique dudit levier. According to a particular embodiment of the invention, applied to such a machine, the lever is articulated on a housing supporting the vibrating assembly and the suction cup is linked to said housing opposite a part made of magnetic material of said lever.

Bien entendu, dans ce cas comme dans celui de la pince portative, le levier peut être constitué en totalité dudit matériau magnétique.  Of course, in this case as in that of the portable clamp, the lever can be made entirely of said magnetic material.

Claims (12)

REVENDICATIONS 1. Pince portative de soudage de feuilles ou films en matière thermo-plastique, caractérisée en ce que l'énergie nécessaire à la réalisation de la soudure est fournie par un dispositif vibrant à fréquence ultrasonique (2).1. Portable clamp for welding sheets or films of thermoplastic material, characterized in that the energy necessary for carrying out the welding is supplied by a vibrating device with ultrasonic frequency (2). 2. Pince selon la revendication 1, caractérisée en ce que le dispositif vibrant à fréquence ultrasonique (2) comporte une sonotrode (22) dont l'extrémité active est appliquée en pression sur lesdits films ou feuilles (10) placés en position superposée.2. Clamp according to claim 1, characterized in that the ultrasonic frequency vibrating device (2) comprises a sonotrode (22) whose active end is applied under pressure to said films or sheets (10) placed in superimposed position. 3. Pince selon la revendication 2, caractérisée en ce qu'elle comprend un corps (1) sur lequel est fixé le dispositif vibrant (2), un bras (13) articulé sur ledit corps (1) et portant une enclume (14) située en regard de l'extrémité (24) de la sonotrode, et des moyens de commande du mouvement dudit bras (13) pour exercer la pression de soudage en serrant les films à souder entre la sonotrode (22) et l'enclume (14).3. Pliers according to claim 2, characterized in that it comprises a body (1) on which is fixed the vibrating device (2), an arm (13) articulated on said body (1) and carrying an anvil (14) located opposite the end (24) of the sonotrode, and means for controlling the movement of said arm (13) to exert the welding pressure by clamping the films to be welded between the sonotrode (22) and the anvil (14 ). 4. Pince selon la revendication 3, caractérisée en ce que ledit bras (13) est actionné par des organes moteurs comportant des organes électromagnétiques.4. Pliers according to claim 3, characterized in that said arm (13) is actuated by drive members comprising electromagnetic members. 5. Pince selon la revendication 4, caractérisée en ce que lesdits organes électromagnétiques comportent un électro-aimant à noyau plongeur (32).5. Clamp according to claim 4, characterized in that said electromagnetic members comprise an electromagnet with a plunger core (32). 6. Pince selon la revendication 4, caractérisée en ce que lesdits organes électromagnétiques compo rtent une ventouse magnétique (31).6. Pliers according to claim 4, characterized in that said electromagnetic members compo rt a magnetic suction cup (31). 7. Pince selon la revendication 4, caractérisée en ce que lesdits organes électromagnétiques comportent un électro-aimant à noyau plongeur (32) pour approcher l'enclume (14) de l'extrémité active (24) de la sonotrode (22) et une ventouse magnétique (31) pour assurer la pression de soudage.7. Clamp according to claim 4, characterized in that said electromagnetic members comprise an electromagnet with plunger core (32) for approaching the anvil (14) of the active end (24) of the sonotrode (22) and a magnetic suction cup (31) for ensuring the welding pressure. 8. Pince selon la revendication 7, caractérisée en ce que le corps (1) comporte une poignée (35) pourvue d'organes de commande du soudage et contient les organes électromagnétiques (31, 32) d'actionnement du bras (13), ledit bras étant articulé sur le corps (1) en une position éloignée de l'extrémité active (24) de la sonotrode (22) et comportant une partie réalisée en matériau magnétique située entre l'articulation (12) et l'enclume (14) en regard de la ventouse magnétique (31) fixée dans le corps (1) de telle sorte que la surface (18) de ladite partie magnétique du bras (13) soit en contact ou très proche de la ventouse magnétique (31) lorsque le dispositif vibrant (2) est commandé pour réaliser la soudure.8. Pliers according to claim 7, characterized in that the body (1) comprises a handle (35) provided with welding control members and contains the electromagnetic members (31, 32) for actuating the arm (13), said arm being articulated on the body (1) in a position remote from the active end (24) of the sonotrode (22) and comprising a part made of magnetic material located between the articulation (12) and the anvil (14 ) opposite the magnetic suction cup (31) fixed in the body (1) so that the surface (18) of said magnetic part of the arm (13) is in contact or very close to the magnetic suction cup (31) when the vibrating device (2) is controlled to perform the welding. 9. Pince selon la revendication 8, caractérisée en ce que l'enclume (14) est amovible.9. Pliers according to claim 8, characterized in that the anvil (14) is removable. 10. Pince selon la revendication 8, caractérisée en ce que l'enclume (14) est fixée à l'extrémité d'un coulisseau (15) rétractable dans le bras (13), ce qui permet de souder des produits autres que des films.10. Pliers according to claim 8, characterized in that the anvil (14) is fixed to the end of a slide (15) retractable in the arm (13), which makes it possible to weld products other than films . 11. Machine de soudage par ultrasons de films de matière thermo-plastique du type comportant un ensemble vibrant composé d'une sonotrode, d'un convertisseur électro-acoustique et d'un résonateur et une enclume mobile susceptible d'exercer une pression sur les films de matières plastiques placés en vue de leur soudage entre l'extrémité de la sonotrode et ladite enclume, caractérisée en ce que l'enclume (14) est montée vers l'extrémité d'un levier (13) pivotant actionné par un électro-aimant (32) du type à noyau plongeur et en ce qu'une ventouse magnétique (31) assure le maintien en pression de l'enclume. 11. Machine for ultrasonic welding of films of thermoplastic material of the type comprising a vibrating assembly composed of a sonotrode, an electro-acoustic converter and a resonator and a movable anvil capable of exerting pressure on the plastic films placed for welding between the end of the sonotrode and said anvil, characterized in that the anvil (14) is mounted towards the end of a pivoting lever (13) actuated by an electro- magnet (32) of the plunger core type and in that a magnetic suction cup (31) maintains the pressure of the anvil. 12. Machine selon la revendication 1, caractérisée en ce que le levier (13) est articulé sur un carter supportant l'ensemble vibrant (2) et en ce que la ventouse (31) est liée audit carter, en face d'une partie en matériau magnétique dudit levier. 12. Machine according to claim 1, characterized in that the lever (13) is articulated on a housing supporting the vibrating assembly (2) and in that the suction cup (31) is linked to said housing, opposite a part of magnetic material of said lever.
FR8615511A 1986-11-06 1986-11-06 PORTABLE WELDING MACHINE FOR THERMO-PLASTIC FILMS OR SHEETS Expired FR2606322B1 (en)

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FR8615511A FR2606322B1 (en) 1986-11-06 1986-11-06 PORTABLE WELDING MACHINE FOR THERMO-PLASTIC FILMS OR SHEETS

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FR8615511A FR2606322B1 (en) 1986-11-06 1986-11-06 PORTABLE WELDING MACHINE FOR THERMO-PLASTIC FILMS OR SHEETS

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FR2606322B1 FR2606322B1 (en) 1989-03-31

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FR2794395A1 (en) * 1999-06-01 2000-12-08 Decoup & Industrial tool using ultrasound generator as energy source has tool and counter-tool supports in form of clamps

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US2369362A (en) * 1942-06-05 1945-02-13 Frank Evans Bowker Pressure applicator
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US3602421A (en) * 1969-07-11 1971-08-31 Branson Instr Sonic welding tool
US3917146A (en) * 1975-04-04 1975-11-04 Branson Ultrasonics Corp Portable vibratory welding apparatus
DE3113340A1 (en) * 1980-04-04 1982-02-04 Gaberz, Hans, 1232 Wien Packaging apparatus for bundles of securities, especially banknote bundles
DE3316873A1 (en) * 1983-05-07 1984-11-15 Schunk Ultraschalltechnik Gmbh, 8750 Aschaffenburg Device for connecting electrical conductors
EP0154578A2 (en) * 1984-02-27 1985-09-11 Fairchild Semiconductor Corporation Variation and control of bond force

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Publication number Priority date Publication date Assignee Title
US2305010A (en) * 1939-12-20 1942-12-15 Walter E Kenney Electric cellophane bag sealer
US2369362A (en) * 1942-06-05 1945-02-13 Frank Evans Bowker Pressure applicator
US2982334A (en) * 1959-04-24 1961-05-02 Sperry Rand Corp Longitudinal seam sealer
US3426951A (en) * 1961-11-06 1969-02-11 Lehfeldt & Co Gmbh Dr Ultrasonic welding apparatus
DE1297963B (en) * 1964-09-23 1969-06-19 Jacobs Device for welding metal parts or other weldable materials
FR1600913A (en) * 1968-11-18 1970-08-03
US3602421A (en) * 1969-07-11 1971-08-31 Branson Instr Sonic welding tool
US3917146A (en) * 1975-04-04 1975-11-04 Branson Ultrasonics Corp Portable vibratory welding apparatus
DE3113340A1 (en) * 1980-04-04 1982-02-04 Gaberz, Hans, 1232 Wien Packaging apparatus for bundles of securities, especially banknote bundles
DE3316873A1 (en) * 1983-05-07 1984-11-15 Schunk Ultraschalltechnik Gmbh, 8750 Aschaffenburg Device for connecting electrical conductors
EP0154578A2 (en) * 1984-02-27 1985-09-11 Fairchild Semiconductor Corporation Variation and control of bond force

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2794395A1 (en) * 1999-06-01 2000-12-08 Decoup & Industrial tool using ultrasound generator as energy source has tool and counter-tool supports in form of clamps
WO2001012422A1 (en) * 1999-06-01 2001-02-22 Decoup + Device for producing appliances using as energy source an ultrasound generator

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