FR2571304A1 - Sealing appts. for plastics sheets comprising opposed rollers - Google Patents

Sealing appts. for plastics sheets comprising opposed rollers Download PDF

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Publication number
FR2571304A1
FR2571304A1 FR8514649A FR8514649A FR2571304A1 FR 2571304 A1 FR2571304 A1 FR 2571304A1 FR 8514649 A FR8514649 A FR 8514649A FR 8514649 A FR8514649 A FR 8514649A FR 2571304 A1 FR2571304 A1 FR 2571304A1
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France
Prior art keywords
motor
pressure rollers
welding
chassis
motors
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Granted
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FR8514649A
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French (fr)
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FR2571304B1 (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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/865—Independently movable welding apparatus, e.g. on wheels
    • B29C66/8652—Independently movable welding apparatus, e.g. on wheels being pushed by hand or being self-propelling
    • B29C66/86521—Independently movable welding apparatus, e.g. on wheels being pushed by hand or being self-propelling being self-propelling
    • B29C66/86523—Independently movable welding apparatus, e.g. on wheels being pushed by hand or being self-propelling being self-propelling the traction being made on the seam
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B29C65/2053—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by special ways of bringing the welding mirrors into position
    • B29C65/2061—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by special ways of bringing the welding mirrors into position by sliding
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/80—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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/8161—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 said pressing elements being supported or backed-up by springs or by resilient material
    • 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
    • B29C66/8227—Transmission mechanisms using springs
    • 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
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • B29C66/8362—Rollers, cylinders or drums moving relative to and tangentially to the parts to be joined
    • 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
    • B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
    • B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93451—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed by controlling or regulating the rotational speed, i.e. the speed of revolution
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B29C66/81469—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint one placed next to the other in a single line transverse to the feed direction, e.g. shoulder to shoulder sonotrodes
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/932—Measuring or controlling the joining process by measuring or controlling the speed by measuring the speed

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

Abstract

Sealing appts. for plastics sheets comprising opposed rollers each with own pref. coxial motor and speed synchronising controller

Description

La présente invention concerne un appareil de soudage de bandes de matière plastique se composant d'un châssis, d'un dispositifs de chauffage monté de façon à pouvoir se déplacer par translation longitudinale devant le poste de soudage et des rouleaux presseurs placés dans des positions mutuellement opposées, pouvant être appliqués l'un contre 11 autre et pouvant être entraînés par un moteur. The present invention relates to an apparatus for welding strips of plastic material consisting of a frame, a heating device mounted so as to be able to move by longitudinal translation in front of the welding station and pressure rollers placed in positions mutually opposite, can be applied one against the other and can be driven by a motor.

On connaît déjà un appareil de soudage de ce genre pour souder deux bandes de matière plastique se recouvrant mutuellement par leurs extrémités orientées parallèlement l'une par rapport à l'autre. Cet appareil de soudage se compose d'un châssis de profil allongé, relié au moteur d'entraînement et sur lequel sont montés deux rouleaux supérieurs de soudage qui sont respectivement reliés de façon pivotante à un levier coudé. En regard de ces rouleaux, il est également prévu deux rouleaux inférieurs de soudage qui sont reliés par l'intermédiaire d'un col de cygne avec le châssis de l'appareil de soudage. A welding apparatus of this kind is already known for welding two strips of plastic material overlapping each other by their ends oriented parallel to one another. This welding device consists of an elongated profile chassis, connected to the drive motor and on which are mounted two upper welding rollers which are respectively pivotally connected to a bent lever. Next to these rollers, two lower welding rollers are also provided which are connected by means of a swan neck with the chassis of the welding device.

Il est prévu, dans la direction de travail en avant des rouleaux de soudage, des rouleaux presseurs qui sont soumis à une précontrainte par l'intermédiaire d'un ressort en forme de lame, Entre les deux rouleaux presseurs, il est prévu un corps de chauffage par contact ayant une forme de coin, déplaçable dans la direction longitudinale et par lequel les deux bandes de matière plastique à souder sont chauffées jusqu'à des températures de soudage suivant deux lignes orientées parallèlement entre elles. Aux deux extrémités longitudinales du châssis de l'appareil, il est en outre prévu des rouleaux pour appuyer l'appareil sur la bande de matière plastique inférieure.Le moteur d'entraine- ment assure l'entraînement, par l'intermédiaire de deux pignons, de deux mécanismes à chaînes dont l'un entraîne, par l'intermédiaire de trois arbres et de pignons coniques correspondants, les rouleaux inférieurs de soudage. Les rouleaux supérieurs de soudage sont reliés au second mécanisme à chaîne. Un appareil de soudage connu de ce genre est d'une construction très compliquée et lourde. Pressure rollers are provided in the working direction in front of the welding rollers, which are preloaded by means of a leaf-shaped spring. A body is provided between the two pressure rollers. contact heating having a wedge shape, movable in the longitudinal direction and by which the two strips of plastic material to be welded are heated to welding temperatures along two lines oriented parallel to each other. Rollers are also provided at the two longitudinal ends of the device chassis to press the device onto the lower plastic strip. The drive motor provides the drive via two pinions , of two chain mechanisms, one of which drives, via three shafts and corresponding bevel gears, the lower welding rollers. The upper welding rollers are connected to the second chain mechanism. A known welding device of this kind is of a very complicated and heavy construction.

La présente invention a en conséquence pour but de créer un appareil de soudage du type défini ci-dessus pour le soudage de bandes de matière plastique, cet appareil étant d'une construction particulièrement simple. The present invention therefore aims to create a welding device of the type defined above for welding strips of plastic material, this device being of a particularly simple construction.

Conformément à l'invention, ce problème est résolu en ce que les rouleaux presseurs peuvent être entraînés chacun par un moteur propre, lesdits moteurs étant reliés à un dispositif de commande réglable et pouvant être commandés par l'intermédiaire de celui-ci en vue d'une marche synchronisée. Un appareil de soudage agencé de cette manière est d'une construction particulièrement simple car on supprime les entraînements à chaînes ou arbres avec transmissions compliquées qui sont coûteux et sujets à des pannes. Il en résulte une structure de poids particulièrement léger de sorte qu'un appareil de soudage conforme à l'invention peut être utilisé sans difficulté de manière à se déplacer par lui-même sur les bandes de matière plastique déjà mises en place en vue d'assurer leur soudage.En outre, avec un tel agencement, on obtient également l'avantage,sans faire intervenir des moyens auxiliaires additionnels ou des opérations de transformation dans des cas particuliers, de pouvoir établir le cas échéant également un fonctionnement synchronisé des deux rouleaux presseurs, de manière à pouvoir contourner une accumulation de matière dans la zone du joint de soudure ou lien de pouvoir franchir des parties à rayons. According to the invention, this problem is solved in that the pressure rollers can each be driven by a clean motor, said motors being connected to an adjustable control device and being able to be controlled by means of the latter for the purpose of '' a synchronized walk. A welding device arranged in this way is of a particularly simple construction since it eliminates the chain drives or shafts with complicated transmissions which are expensive and prone to breakdowns. This results in a particularly light weight structure so that a welding device according to the invention can be used without difficulty so as to move by itself on the plastic strips already put in place for Furthermore, with such an arrangement, the advantage is also obtained, without involving additional auxiliary means or processing operations in particular cases, of being able to establish, where appropriate, also synchronized operation of the two pressure rollers. , so as to be able to circumvent an accumulation of material in the area of the weld joint or link to be able to cross parts with spokes.

Conformément à une variante avantageuse de mise en oeuvre de l'invention, il est prévu que les axes des rouleaux presseurs soient orientés respectivement coaxialement par rapport à l'axe du rotor du moteur associé, de sorte qu'il est possible d'obtenir un agencement particulièrement simple, auquel cas on peut établir au moyen d'une transmission à train planétaire une démultiplication de la vitesse périphérique en vue de produire un couple favorable. In accordance with an advantageous variant of implementation of the invention, it is provided that the axes of the pressure rollers are oriented respectively coaxially with respect to the axis of the rotor of the associated motor, so that it is possible to obtain a particularly simple arrangement, in which case it is possible to establish by means of a planetary gear a reduction of the peripheral speed in order to produce a favorable torque.

Conformément à une autre caractéristique de l'invention, il est également prévu que chaque moteur soit disposé sur un profilé du châssis dont l'axe longitudinal est orienté perpendiculairement à l'axe du moteur, lesdits profilés de châssis étant reliés de façon tournante par leurs extrémités opposées aux moteurs de façon à pouvoir tourner autour d'un axe orienté parallèlement aux axes des rouleaux presseurs ou des moteurs. Cet agencement permet une fixation particulièrement simple des deux moteurs et des rouleaux presseurs dans des directions mutuellement coaxiales en vue d'une réalisation précise des joints de soudure indépendamment de l'épaisseur des bandes de matière plastique à souder. Il est également particulièrement important d'obtenir une construction de châssis très simple qui permet d'obtenir une structure de poids très léger. In accordance with another characteristic of the invention, it is also provided that each motor is placed on a profile of the chassis, the longitudinal axis of which is oriented perpendicular to the axis of the motor, said chassis profiles being rotatably connected by their ends opposite the motors so that they can rotate about an axis oriented parallel to the axes of the pressure rollers or the motors. This arrangement allows a particularly simple fixing of the two motors and the pressure rollers in mutually coaxial directions for a precise realization of the weld seams regardless of the thickness of the plastic strips to be welded. It is also particularly important to obtain a very simple chassis construction which makes it possible to obtain a structure of very light weight.

Enfin, selon encore une autre variante de l'invention, les deux profilés de châssis servant à appliquer les rouleaux presseurs l'un contre l'autre sont soumis à une précontrainte, de sorte qu'on est assuré d'obtenir pour les rouleaux presseurs la force d'application nécessaire pour produire un joint soudé ayant de façon constante une haute qualité. Finally, according to yet another variant of the invention, the two chassis sections used to apply the pressure rollers against each other are subjected to a prestress, so that one is guaranteed to obtain for the pressure rollers the application force necessary to produce a consistently high quality welded joint.

D'autres caractéristiques et avantages de l'invention seront mis en évidence dans la suite de la description, donnée à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels la figure 1 est une vue de face d'un appareil de soudage agencé conformément à L'invention; la figure 2 est une vue en plan de l'appareil de soudage de la figure 1, et la figure 3 représente schématiquement un dispositif de commande. Other characteristics and advantages of the invention will be highlighted in the following description, given by way of nonlimiting example, with reference to the appended drawings in which FIG. 1 is a front view of an apparatus for welding arranged in accordance with the invention; Figure 2 is a plan view of the welding apparatus of Figure 1, and Figure 3 schematically shows a control device.

L'appareil de soudage se compose d'un châssis 2 comportant des rouleaux presseurs supérieurs et inférieurs 3, 4 et un dispositif de commande 5 Le châssis 2 de l'appareil se compose de deux profilés 6, 7 de section rectangulaire, qui sont orientés parallèlement entre eux et qui sont reliés entre eux, dans leur zone extrême arrière, en considérant la direction de travail indiquée par une flèche 8, au moyen d'un tube 9 orienté transversalement. The welding device consists of a frame 2 comprising upper and lower pressure rollers 3, 4 and a control device 5 The frame 2 of the device consists of two profiles 6, 7 of rectangular section, which are oriented parallel to each other and which are interconnected in their rear end zone, considering the working direction indicated by an arrow 8, by means of a tube 9 oriented transversely.

Alors qu'un profilé de châssis 6 est relié rigidement avec le tube 9, l'autre profilé de châssis 7 peut pivoter autour de l'axe 10 du tube 9.While a chassis profile 6 is rigidly connected with the tube 9, the other chassis profile 7 can pivot around the axis 10 of the tube 9.

Dans une zone extrême avant des deux profilés de châssis 6 et 7, il est prévu respectivement un moteur 11, 12 et une transmission à train planétaire 13, 14, les rouleaux presseurs 3, 4 étant reliés à la transmission respective. Les axes des deux rouleaux presseurs 3, 4 sont disposés coaxialement par rapport aux axes des moteurs correspondants. Chaque rouleau presseur 3, 4 se compose de deux roues en caoutchouc, espacées l'une de l'autre, de façon à former un double joint de soudure. On pourrait cependant également prévoir une seule roue de ce genre pour l'exécution d'un seul joi#nt de soudure ou bien plusieurs roues pour exécuter plusieurs joints de soudure. In an extreme front zone of the two chassis sections 6 and 7, a motor 11, 12 and a planetary gear transmission 13, 14 are respectively provided, the pressure rollers 3, 4 being connected to the respective transmission. The axes of the two pressure rollers 3, 4 are arranged coaxially with respect to the axes of the corresponding motors. Each pressure roller 3, 4 consists of two rubber wheels, spaced from one another, so as to form a double welded joint. One could however also provide a single wheel of this kind for the execution of a single welding joi # nt or several wheels to execute several welding joints.

Sur le profilé de châssis de droite 6 est fixée, par l'intermédiaire de deux cornières 15 ( dont seulement une partie a été représentée sur la figure 2 pour clarifier le dessin ) une poignée 16 ( seulement sur la figure 1 comportant un contacteur 17. Des conducteurs de commande 18 partent du dispositif de commande 5 et traversent la poignée 16 pour arriver au contacteur 17 et, à partir de celui-ci et par l'intermédiaire d'une cornière creuse 15, jusqu'aux deux moteurs 11, 12 de façon à les faire tourner en synchronisme, lesdits conducteurs étant en outre reliés à un dispositif de chauffage 19 placé au milieu. Ce dispositif est agencé en forme de coin et il est fixé par l'intermédiaire d'une tringlerie en parallélogramme 23 de façon à pouvoir se déplacer longitudinalement par translation sur le profilé de châssis 6.On the right chassis profile 6 is fixed, by means of two angles 15 (of which only a part has been shown in FIG. 2 to clarify the drawing) a handle 16 (only in FIG. 1 comprising a contactor 17. Control conductors 18 leave the control device 5 and pass through the handle 16 to reach the contactor 17 and, from this and through a hollow angle 15, to the two motors 11, 12 of so as to rotate them in synchronism, said conductors being further connected to a heating device 19 placed in the middle. This device is arranged in a wedge shape and is fixed by means of a parallelogram linkage 23 so as to ability to move longitudinally by translation on chassis profile 6.

Les moteurs 11 et 12 entraînant dans des directions mutuellement opposées les rouleaux presseurs 3, 4 - qui sont poussés l'un vers l'autre par un ressort, non représenté et disposé dans le profilé de châssis 7 reçoivent chacun un courant de 0,62 A à 5600 tr/min. La marche synchronisée des deux moteurs peut être décelée par trois moyens, à savoir par une même consommation de courant ou bien par une même tension ou bien par un contrôle de la vitesse de rotation des rouleaux presseurs 3, 4 pendant dix minutes à l'aide d'une minuterie.Sur la figure 2, on a représenté schématiquement les deux bandes de matière plastique 20 et 21 qui sont soudées l'une avec l'autre entre les deux rouleaux presseurs après échauffement par le corps de chauffage par contact 19. Dans ce but, la bande de matière plastique inférieure est guidée en dessous du corps de chauffage par contact 19 tandis que la bande de matière plastique supérieure 21 est guidée au dessus du corps de chauffage par contact 19. L'appareil peut souder ensemble de façon auto-motrice des bandes de matière plastique déjà mises en place. The motors 11 and 12 driving the pressure rollers 3, 4 in mutually opposite directions - which are pushed towards each other by a spring, not shown and arranged in the chassis profile 7 each receive a current of 0.62 A at 5600 rpm. The synchronized running of the two motors can be detected by three means, namely by the same current consumption or by the same voltage or by controlling the speed of rotation of the pressure rollers 3, 4 for ten minutes using In FIG. 2, the two plastic strips 20 and 21 are shown diagrammatically, which are welded to each other between the two pressure rollers after heating by the contact heating body 19. In For this purpose, the lower plastic strip is guided below the contact heating body 19 while the upper plastic strip 21 is guided above the contact heating body 19. The apparatus can weld together automatically -motor of the plastic bands already put in place.

Pour assurer la marche synchronisée des deux moteurs 11, 12, chacun des deux moteurs est équipé d'un capteur de vitesse de rotation, non représenté, lesdits capteurs étant reliés par des conducteurs avec le dispositif de commande 5, qui est représenté schématiquement sur la figure 3. Ces capteurs de vitesses de rotation peuvent également être agencés, dans le cadre des réalisations décrites ci-dessus, par des capteurs de tension ou d'intensité de courant et ils ne doivent pas être agencés comme des tachygénérateurs. To ensure the synchronized operation of the two motors 11, 12, each of the two motors is equipped with a speed sensor, not shown, said sensors being connected by conductors with the control device 5, which is shown diagrammatically on the Figure 3. These rotational speed sensors can also be arranged, in the context of the embodiments described above, by voltage or current intensity sensors and they must not be arranged as tachygenerators.

Ces capteurs de vitesses de rotation sont reliés aux bornes 30, 30' du dispositif de commande 5 et ils fournissent des signaux représentant la vitesse de rotation du moteur associé 11, 12, lesdits moteurs étant alimentés en courant par l'intermédiaire de circuits d'excitation 33, 35. A cet effet, les sorties des deux circuits d'excitation 33 et 35 sont reliées aux bornes 34, 36 à chacune desquelles est relié un des deux moteurs. Ces circuits d'excitation fournissent un courant correspondant au signal de commande appliqué et ils peuvent être constitués par exemple par des transistors. These rotational speed sensors are connected to terminals 30, 30 'of the control device 5 and they supply signals representing the rotational speed of the associated motor 11, 12, said motors being supplied with current by means of circuits of excitation 33, 35. To this end, the outputs of the two excitation circuits 33 and 35 are connected to terminals 34, 36 to each of which is connected one of the two motors. These excitation circuits supply a current corresponding to the control signal applied and they can be constituted for example by transistors.

Le circuit d'excitation 33 est relié à un générateur de valeur de consigne 32 et il alimente le moteur servant de moteur de référence alors que par contre le circuit d'excitation 35 est relié à la sortie d'un régulateur de valeur réelle - valeur de consigne 31, qui reçoit le signal du capteur de vitesse associé au moteur de référence comme valeur de consigne et le signal du capteur de vitesse associé au moteur dépendant du moteur de référence comme valeur réelle. Ce régulateur 31 fournit par conséquent à sa sortie un signal de commande dont la grandeur assure la marche synchronisée des deux moteurs 11, 12 et qui est appliquée au circuit d'excitation 35. The excitation circuit 33 is connected to a setpoint generator 32 and it supplies the motor serving as a reference motor whereas, on the other hand, the excitation circuit 35 is connected to the output of a real value - value regulator. reference 31, which receives the signal from the speed sensor associated with the reference motor as the reference value and the signal from the speed sensor associated with the motor dependent on the reference motor as the actual value. This regulator 31 therefore supplies at its output a control signal whose magnitude ensures the synchronized operation of the two motors 11, 12 and which is applied to the excitation circuit 35.

En outre la borne 40 est reliée à un capteur de température, non représenté, qui est placé dans la zone du dispositif de chauffage 19, ladite borne 40 étant reliée à un autre régulateur de valeur réelle- valeur de consigne, dont la seconde entrée est reliée à un générateur de valeur de consigne 42. Egalement ce régulateur 41 fournit un signal de sortie au circuit d'excitation 43, qui alimente en courant le dispositif de chauffage, relié à la borne 44, et qui peut aussi être constitué par un transistor.  In addition, terminal 40 is connected to a temperature sensor, not shown, which is placed in the area of the heating device 19, said terminal 40 being connected to another real value-setpoint regulator, the second input of which is connected to a setpoint generator 42. Also this regulator 41 provides an output signal to the excitation circuit 43, which supplies current to the heating device, connected to terminal 44, and which can also be constituted by a transistor .

Claims (5)

REVENDICATIONS 1. Appareil de soudage de bandes de matière plastique se composant d'un châssis, d'un dispositif de chauffage monté de façon à pouvoir se déplacer par translation longitudinale devant le poste de soudage et des rouleaux presseurs placés dans des positions mutuellement opposées, pouvant être appliqués l'un contre l'autre et pouvant être entraînés par un moteur, caractérisé en ce que les rouleaux presseurs (3, 4) peuvent être entraînés chacun par un moteur propre (11,12), lesdits moteurs étant reliés à un dispositif de commande (5) réglable spécialement et pouvant être commandés par l'intermédiaire de ce dispositif en vue d'une marche synchronisée.1. Apparatus for welding plastic strips consisting of a chassis, a heating device mounted so as to be able to move in longitudinal translation in front of the welding station and pressure rollers placed in mutually opposite positions, capable of be applied against each other and capable of being driven by a motor, characterized in that the pressure rollers (3, 4) can each be driven by a clean motor (11,12), said motors being connected to a device control (5) specially adjustable and can be controlled via this device for synchronized operation. 2. Appareil de soudage selon la revendication 1, caractérisé en ce que les axes des rouleaux presseurs (3, 4) sont respectivement coaxiaux par rapport à l'axe du rotor du moteur associé (11, 12).2. Welding apparatus according to claim 1, characterized in that the axes of the pressure rollers (3, 4) are respectively coaxial with respect to the axis of the rotor of the associated motor (11, 12). 3. Appareil de soudage selon une des revendications 1 ou 2, caractérisé en ce qu'il est prévu entre le moteur (11, 12) et le rouleau presseur associé (3, 4) une transmission à train planétaire (13, 14).3. Welding apparatus according to one of claims 1 or 2, characterized in that there is provided between the motor (11, 12) and the associated pressure roller (3, 4) a planetary gear transmission (13, 14). 4. Appareil de soudage selon une quelconque des revendications 1 à 3, caractérisé en ce que chaque moteur (11, 12) est disposé sur un profilé de châssis (6, 7) dont l'axe longitudinal est orienté perpendiculairement à l'axe du moteur et en ce que lesdits profilés de châssis (6, 7) sont reliés entre eux de façon tournante par leurs extrémités opposées au moteur de façon à pouvoir tourner autour d'un axe orienté parallèlement aux axes des rouleaux presseurs (3, 4) ou des moteurs (11, 12). 4. Welding apparatus according to any one of claims 1 to 3, characterized in that each motor (11, 12) is disposed on a chassis profile (6, 7) whose longitudinal axis is oriented perpendicular to the axis of the motor and in that said chassis profiles (6, 7) are connected to each other in a rotatable manner by their ends opposite the motor so as to be able to rotate about an axis oriented parallel to the axes of the pressure rollers (3, 4) or motors (11, 12). 5. Appareil de soudage selon une quelconque des revendications 1 à 4, caractérisé en ce que les deux profilés de châssis (6, 7-) sont soumis à une précontrainte pour appliquer les rouleaux presseurs (3, 4) l'un contre l'autre. 5. Welding apparatus according to any one of claims 1 to 4, characterized in that the two chassis profiles (6, 7-) are subjected to a prestress to apply the pressure rollers (3, 4) one against the other.
FR8514649A 1984-10-04 1985-10-03 Sealing appts. for plastics sheets comprising opposed rollers Granted FR2571304A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT314384A AT381274B (en) 1984-10-04 1984-10-04 WELDING MACHINE

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FR2571304A1 true FR2571304A1 (en) 1986-04-11
FR2571304B1 FR2571304B1 (en) 1990-08-03

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CH (1) CH667038A5 (en)
DE (1) DE3533338C2 (en)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0564189A1 (en) * 1992-04-03 1993-10-06 Sekisui Jushi Kabushiki Kaisha A method for welding a packing band of thermoplastic resin, and a welded band
WO2016020470A1 (en) * 2014-08-08 2016-02-11 Rema Tip Top Ag Double-acting roller
EP3028836A1 (en) * 2014-12-04 2016-06-08 Leister Technologies AG Welding machine for connecting of overlapping sheets of material

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3921711C1 (en) * 1988-11-08 1990-03-29 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern, De
DE4020704C1 (en) * 1990-06-29 1991-11-28 G.M. Pfaff Ag, 6750 Kaiserslautern, De
DE102017207226A1 (en) * 2017-04-28 2018-10-31 Robert Bosch Gmbh Device for sealing a packaging material web

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2339476A1 (en) * 1976-01-30 1977-08-26 Sarna Kunststoff Ag Portable thermoplastic film welder not requiring backing - having double film heater plus double pair welding rollers
EP0009015A1 (en) * 1978-07-20 1980-03-19 ISO-Bau Gesellschaft m.b.H Hand operated welding tool for webs or covers of thermoplastic material
JPS55105524A (en) * 1979-02-09 1980-08-13 Hitachi Cable Ltd Pressing device for lap joined portion of sheet
DE3303092A1 (en) * 1982-01-29 1983-10-06 Bauplast Ges Mbh & Co Kg Welding device
JPS5939514A (en) * 1982-08-31 1984-03-03 Brother Ind Ltd Ultrasonic machining tool

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT381672B (en) * 1982-01-25 1986-11-10 Schober Leopold DEVICE FOR CONNECTING EDGE-LAYING SURFACES OF PLASTIC PLASTIC

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2339476A1 (en) * 1976-01-30 1977-08-26 Sarna Kunststoff Ag Portable thermoplastic film welder not requiring backing - having double film heater plus double pair welding rollers
EP0009015A1 (en) * 1978-07-20 1980-03-19 ISO-Bau Gesellschaft m.b.H Hand operated welding tool for webs or covers of thermoplastic material
JPS55105524A (en) * 1979-02-09 1980-08-13 Hitachi Cable Ltd Pressing device for lap joined portion of sheet
DE3303092A1 (en) * 1982-01-29 1983-10-06 Bauplast Ges Mbh & Co Kg Welding device
JPS5939514A (en) * 1982-08-31 1984-03-03 Brother Ind Ltd Ultrasonic machining tool

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 4, no. 154 (M-38)[636], 28 octobre 1980; & JP-A-55 105 524 (HITACHI DENSEN K.K.) 13-08-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 140 (M-305)[1577], 29 juin 1984; & JP-A-59 39 514 (BROTHER KOGYO K.K.) 03-03-1984 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0564189A1 (en) * 1992-04-03 1993-10-06 Sekisui Jushi Kabushiki Kaisha A method for welding a packing band of thermoplastic resin, and a welded band
US5542239A (en) * 1992-04-03 1996-08-06 Sekisui Jushi Kabushiki Kaisha Method for welding a packing band of thermoplastic resin and a welded band resulting therefrom
WO2016020470A1 (en) * 2014-08-08 2016-02-11 Rema Tip Top Ag Double-acting roller
EP3028836A1 (en) * 2014-12-04 2016-06-08 Leister Technologies AG Welding machine for connecting of overlapping sheets of material
CN105666854A (en) * 2014-12-04 2016-06-15 莱丹科技股份公司 Welding machine
CN105666854B (en) * 2014-12-04 2017-10-20 莱丹科技股份公司 Bonding machine

Also Published As

Publication number Publication date
FR2571304B1 (en) 1990-08-03
ATA314384A (en) 1986-02-15
DE3533338C2 (en) 1994-04-07
DE3533338A1 (en) 1986-04-10
AT381274B (en) 1986-09-25
CH667038A5 (en) 1988-09-15

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