EP0076735A1 - Apparatus for applying a thermofusible glue - Google Patents

Apparatus for applying a thermofusible glue Download PDF

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Publication number
EP0076735A1
EP0076735A1 EP82401751A EP82401751A EP0076735A1 EP 0076735 A1 EP0076735 A1 EP 0076735A1 EP 82401751 A EP82401751 A EP 82401751A EP 82401751 A EP82401751 A EP 82401751A EP 0076735 A1 EP0076735 A1 EP 0076735A1
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EP
European Patent Office
Prior art keywords
thermistor
heating body
electrode
flat
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP82401751A
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German (de)
French (fr)
Inventor
Gérard GRANDCLEMENT
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Toutelectric SAM
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Toutelectric SAM
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Publication date
Application filed by Toutelectric SAM filed Critical Toutelectric SAM
Publication of EP0076735A1 publication Critical patent/EP0076735A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
    • B05C17/00546—Details of the heating means

Definitions

  • the present invention relates to a device for dispensing hot-melt glue, which comprises a heating body in which the cylindrical glue sticks are engaged one by one via a mouthpiece and at the outlet of which is placed a nozzle through which the melted glue.
  • the heating element is heated by an electrical resistance which surrounds it.
  • the assembly is mounted in a housing.
  • the principle of such an apparatus is simple.
  • the glue stick is engaged in the heating tube by the rear mouth, and pushed into this tube by the pressure of the user's finger or any other mechanical means. Its front end melts in the heating tube and the liquid glue comes out through the nozzle to be used as long as the pressure is exerted on the other end of the stick.
  • a major drawback of current devices lies in the fact that the heating resistors are formed from a heating wire wound around the heating tube, by means of an electrical insulator.
  • the heating system has no temperature regulation or limitation. It follows that either these resistances are adapted so that the operating temperature of the heating tube is the appropriate temperature, of around 200 ° C., for the hotmelt adhesives. conventional, and the heating time for the device to be usable is then very long, greater than 10 or 15 minutes; either these resistors are overpowered, so that the heating time is shorter, and the operating temperature is then very high, bringing operating disadvantages, and additional manufacturing constraints in order to overcome the difficulties due to the higher temperatures. .
  • the main object of the present invention is to remedy these drawbacks by using, as heating element, one or more termistors arranged on the heating body so as to obtain rapid heating followed by temperature regulation.
  • a thermistor with a positive temperature coefficient is used.
  • Such a thermistor has an approximately constant electrical resistance up to a temperature slightly above the melting temperature of the hot-melt adhesives. Above this temperature, the electrical resistance increases very strongly.
  • thermoelectric thermistors on the heating body must therefore make it possible to raise its temperature very quickly to the desired temperature, then to maintain this temperature by regulation. It is necessary, in order to obtain rapid heating and good temperature regulation, that the heat transfer is the best possible between the thermistor and the glue to melt in the heating body.
  • the geometry of the heating body must be perfectly adapted to that of the thermistors.
  • the heating element must be light in weight and a good conductor in order to obtain rapid heating.
  • the thermistor must have the maximum area in contact with the heating element and be placed as close as possible to the glue pipe inside the heating pipe.
  • this is obtained, according to the invention, using thermistors in the form of thin pellets, the two opposite large faces of which are the current supply faces, the external surface of the heating body having a flat face opposite one of the large faces of each thermistor, the surface of each flat being at least equal to that of a large thermistor face.
  • the external electrode also has flats coming to take place against a surface of the same shape of the heating body, by means of a thin insulator, so that the external electrode participates in the transmission. from the thermistor to the heater.
  • the device according to the invention comprises a heating body 1 that is a good conductor of heat, for example made of aluminum alloy.
  • This heating body 1 is preceded by a supply duct 2 of the glue sticks, made of an insulating material and followed by a heat-conducting nozzle 3, supported on the heating body by its face 4 to be heated .
  • the nozzle casing 5 made of an electrically insulating material and the purpose of which is to isolate the metal nozzle 3 from contact with the user, the nozzle being energized via the conduit heating, if the latter is a current supply electrode as described below in the first variant of the invention according to FIG. 2.
  • the nozzle casing 5 is no longer necessary, and the nozzle metal 3 can be fixed directly to the heating body 1 by any suitable means.
  • a housing 8 generally made of an insulating material, such as for example a molded thermoplastic material.
  • This box reveals the end 9 of the supply duct 2, as well as the nozzle outlet for molten glue.
  • a handle 10 allows the grip of the device, an electrical power cord 11 has two conductors, one end of which is connected to each current supply electrode, by connections 12 and 13.
  • the heating body is surrounded , in its middle part, of the heating assembly 14.
  • the section of FIG. 1 corresponds to the variant embodiment, the cross section of which is shown in FIG. 2.
  • a single thermistor is used, and the heating body 1 constitutes the interior electrode.
  • the thermistor 15 has the shape of a thin patch and whose two large parallel faces are the current supply faces. It has been represented here in the form of a rectangular parallelepiped.
  • the flat 16 is of dimensions at least equal to those of the large face of the thermistor, in order to have the largest contact surface possible.
  • the conductive outer electrode 18, made for example of aluminum alloy, has the shape of a U-shaped profile, the central flat part of which is in contact with the other large face of the thermistor, its two wings 19 and 20 coming in contact with the outside of the heating body, through a flexible insulator 21.
  • the insulator 21 consists of one or more sheets of an electrical insulating material, with which a thickness of the order of 0.1 millimeter is sufficient to ensure good isolation.
  • the wings 19 and 20 are in contact with the heating body over a large area, in order to allow good thermal transfer from the electrode 18 to the heating body.
  • the mechanical strength of the heating assembly around the heating body is brought, for example, by longitudinal beads 22 and 23 of the heating body, visible in FIG. 2, opposite which take place longitudinal recesses 24 and 25 of l 'external electrode.
  • the beads of the heating body 1 and the recesses of the electrode 18 can be replaced by any other suitable shape, for example, the beads can be placed on the electrode 18 and the recesses on the heating body 1.
  • connections of the supply conductor 11 to the electrodes can be made, for example, in cells provided in the electrodes for this purpose. There is shown, by way of example, in Figure 2, a cell 26 of the electrode 18 on which will take the connection 12 visible in Figure 1, but not detailed.
  • Figure 3 shows this cell 26, in which a stripped end 28 of the power supply conductor takes place, to be crimped by folding down a tab 27.
  • the same fixing can be used on the heating body to make the connection 13.
  • FIG. 4 represents the section of a second variant of the invention, in which the heating duct 29 is no longer used as an electrode.
  • the electrodes consist of conductive parts 31 and 32, made of aluminum alloy for example, surrounding the thermistor 33.
  • the internal electrode 31 has a surface at least equal to that of a large face of the thermistor; it has the shape of a thin pad, one face of which is in contact with the thermistor, the other face being in contact with a flat part of the heating body 29, by means of a flexible insulator 34.
  • the flat portion of the heating body 29, placed opposite the thermistor, has an area of the order of magnitude of that of the thermistor, to ensure rapid heat transfer.
  • the external electrode 32 has the same characteristics as those described above, with regard to the first variant.
  • Electrodes 31 and 32 There are shown on the electrodes 31 and 32 small beads 35 intended to hold the parts transversely to each other after assembly. Also shown are the cells 36 and 37 intended to receive the ends of the supply conductor.
  • FIG. 5 represents a third variant of the invention, comprising two identical thermistors.
  • thermistors are used in cases where a very high heating power is desired, with a heating duct and thermistors of reduced dimensions.
  • the thermistors are placed around the axis of the heating duct, so as to be close to the central glue channel.
  • FIG. 5 shows the heating duct 38 with its central channel 39, surrounded on its periphery by a flexible insulator 40.
  • Two U-shaped electrodes 41 and 42 are in contact with the two thermistors 43 and 44, l 'one being the interior electrode 41, the other the exterior electrode 42.
  • the thermistors are thus supplied electrically in parallel.
  • Each electrode has two flat surfaces facing the thermistors, these surfaces being at least equal to those of the large faces of the thermistors. Each electrode also has one or more planar surfaces facing the equivalent planar surfaces of the heating body 38, in order to ensure, through the insulator 40, rapid heat transfer.
  • the internal electrode 41 comprises, opposite thermistors 43 and 44, parts 45 and 46 of small thickness, one face of which is in contact with the corresponding thermistor, the other face being in contact with a corresponding shape of the heating body, through the flexible insulation, each contact surface being at least of the order of magnitude of the surface of a large thermistor face, in order to ensure the best heat transfer.
  • FIG. 5 shows sets of beads 47 of the heating body 38, placed opposite recesses 48 of the electrode 41, in order to ensure the reciprocal maintenance of the two parts.
  • the contact surfaces of the electrodes with the heating body, through the insulation are flat. It is clear that these contact surfaces can have a different shape, for example being cylinder portions, without going beyond the ambit of the invention.
  • thin pellet is understood to mean in particular a pellet whose thickness is less than one of the dimensions of the cross section, in particular at radius or short side of the cross section, and, more particularly, is less than one fifth and better than one tenth of this dimension.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Heating (AREA)

Abstract

It comprises a heating body (1) for sticks of glue, which body is heated by an electrical resistor placed near this heating duct, the electrical resistor consisting of at least one thermistor (15) with a positive temperature coefficient, having the form of a pellet of small thickness, the two opposite large faces of which are the current- supply faces, the outer surface of the heating body (1) comprising a flat piece (16) opposite one of the large faces of each thermistor (15), the two dimensions of each flat piece (16) being at least of the same order of magnitude as those of a large face of each thermistor (15). <IMAGE>

Description

La présente invention concerne un appareil distributeur de colle thermofusible, qui comporte un corps de chauffage dans lequel les bâtonnets de colle cylindriques sont engagés un à un par l'intermédiaire d'une embouchure et à la sortie duquel est placée une buse par laquelle sort la colle fondue.The present invention relates to a device for dispensing hot-melt glue, which comprises a heating body in which the cylindrical glue sticks are engaged one by one via a mouthpiece and at the outlet of which is placed a nozzle through which the melted glue.

Le corps de chauffe est chauffé par une résistance électrique qui l'entoure. L'ensemble est monté dans un boîtier. Le principe d'un tel appareil est simple. Le bâtonnet de colle est engagé dans le tube de chauffe par l'embouchure arrière, et poussé dans ce tube par la pression du doigt de l'utilisateur ou tout autre moyen mécanique. Son extrémité antérieure fond dans le tube de chauffe et la colle liquide sort par la buse pour être utilisée tant que la pression est exercée sur l'autre extrémité du bâtonnet.The heating element is heated by an electrical resistance which surrounds it. The assembly is mounted in a housing. The principle of such an apparatus is simple. The glue stick is engaged in the heating tube by the rear mouth, and pushed into this tube by the pressure of the user's finger or any other mechanical means. Its front end melts in the heating tube and the liquid glue comes out through the nozzle to be used as long as the pressure is exerted on the other end of the stick.

Un inconvénient majeur des appareils actuels réside dans le fait que les résistances chauffantes sont formées d'un fil chauffant bobiné autour du tube de chauffe, par l'intermédiaire d'un isolant électrique. Le système de chauffe ne comporte pas de régulation ou de limitation de température. Il s'ensuit que, soit ces résistances sont adaptées pour que la température de régime du tube de chauffe soit la température adéquate, d'environ 200°C, pour les colles thermofusibles classiques, et le temps de chauffe pour que l'appareil soit utilisable est alors très long, supérieur à 10 ou 15 minutes ; soit ces résistances sont surpuissantes, afin que le temps de mise en chauffe soit plus court, et la température de régime est alors très élevée, apportant des inconvénients de fonctionnement, et des contraintes de fabrication supplémentaires afin de pallier aux difficultés dues aux températures plus élevées.A major drawback of current devices lies in the fact that the heating resistors are formed from a heating wire wound around the heating tube, by means of an electrical insulator. The heating system has no temperature regulation or limitation. It follows that either these resistances are adapted so that the operating temperature of the heating tube is the appropriate temperature, of around 200 ° C., for the hotmelt adhesives. conventional, and the heating time for the device to be usable is then very long, greater than 10 or 15 minutes; either these resistors are overpowered, so that the heating time is shorter, and the operating temperature is then very high, bringing operating disadvantages, and additional manufacturing constraints in order to overcome the difficulties due to the higher temperatures. .

La présente invention a comme objectif principal de remédier à ces inconvénients en utilisant, comme organe chauffant, une ou plusieurs termistances agencées sur le corps de chauffe de façon à obtenir un échauffement rapide suivi d'une régulation de la température.The main object of the present invention is to remedy these drawbacks by using, as heating element, one or more termistors arranged on the heating body so as to obtain rapid heating followed by temperature regulation.

On utilise pour cela une thermistance à coefficient de température positif. Une telle thermistance a une résistance électrique à peu près constante jusqu'à une température un peu supérieure à la température de fusion des colles thermofusibles. Au-dessus de cette température, la résistance électrique augmente très fortement.For this, a thermistor with a positive temperature coefficient is used. Such a thermistor has an approximately constant electrical resistance up to a temperature slightly above the melting temperature of the hot-melt adhesives. Above this temperature, the electrical resistance increases very strongly.

L'agencement de telles thermistances sur le corps de chauffe doit donc permettre d`'élever sa température très rapidement jusqu'à la température voulue, puis de conserver cette température par régulation. Il est nécessaire, pour obtenir un échauffement rapide et une bonne régulation de la température, que le transfert de chaleur soit le meilleur possible entre la thermistance et la colle à fondre dans le corps de chauffe.The arrangement of such thermistors on the heating body must therefore make it possible to raise its temperature very quickly to the desired temperature, then to maintain this temperature by regulation. It is necessary, in order to obtain rapid heating and good temperature regulation, that the heat transfer is the best possible between the thermistor and the glue to melt in the heating body.

Pour cela, la géométrie du corps de chauffe doit être parfaitement adaptée à celle des thermistances. Le corps de chauffe doit être de faible poids et bon conducteur afin d'obtenir un échauffement rapide. La-thermistance doit avoir le maximum de surface en contact avec le corps de chauffe et être placée le plus près possible du conduit de colle intérieur au conduit de chauffe. Sur le plan pratique, ceci est obtenu, suivant l'invention, en utilisant des thermistances sous forme de pastilles de faible épaisseur, dont les deux grandes faces opposées sont les faces d'amenée de courant, la surface extérieure du corps de chauffe comportant un méplat en regard de l'une des grandes faces de chaque thermistance, la surface de chaque méplat étant au moins égale à celle d'une grande face de thermistance. L'électrode extérieure comporte, elle aussi, des méplats venant prendre place contre une surface de même forme du corps de chauffe, par l'intermédiaire d'un isolant de faible épaisseur, de façon à ce que l'électrode extérieure participe à la transmission de chaleur de la thermistance vers le corps de chauffe.For this, the geometry of the heating body must be perfectly adapted to that of the thermistors. The heating element must be light in weight and a good conductor in order to obtain rapid heating. The thermistor must have the maximum area in contact with the heating element and be placed as close as possible to the glue pipe inside the heating pipe. On the practical level, this is obtained, according to the invention, using thermistors in the form of thin pellets, the two opposite large faces of which are the current supply faces, the external surface of the heating body having a flat face opposite one of the large faces of each thermistor, the surface of each flat being at least equal to that of a large thermistor face. The external electrode also has flats coming to take place against a surface of the same shape of the heating body, by means of a thin insulator, so that the external electrode participates in the transmission. from the thermistor to the heater.

On obtient ainsi un appareil dont l'ensemble chauffant est facile à fabriquer et dont l'élévation de température est très rapide jusqu'à la température optimale qui est ensuite automatiquement conservée.An apparatus is thus obtained, the heating assembly of which is easy to manufacture and the temperature rise of which is very rapid up to the optimum temperature which is then automatically kept.

L'invention sera mieux comprise avec la description de quelques modes de réalisation d'un appareil applicateur de colle- thermofusible, pris comme exemple, mais non limitatifs et éclairés par les dessins annexés qui représentent :

  • - en figure 1 : la vue d'un appareil complet, suivant l'invention, coupé suivant son plan de symétrie principal ;
  • - en figure 2 : la section du corps de chauffe et de l'ensemble chauffant au droit de la résistance chauffante ;
  • - en figure 3 : le détail d'une version de connexion des électrodes avec les conducteurs d'amenée de courant ;
  • - en figure 4 : la section d'une seconde variante de réalisation de l'ensemble chauffant, coupée au droit de la résistance chauffante ;
  • - en figure 5 : la section d'une troisième variante de réalisation de l'ensemble chauffant comportant deux thermistances identiques, coupée au droit de la résistance chauffante.
The invention will be better understood with the description of some embodiments of a hot-melt adhesive applicator device, taken as an example, but not limiting and illustrated by the appended drawings which represent:
  • - In Figure 1: the view of a complete device, according to the invention, cut along its main plane of symmetry;
  • - in Figure 2: the section of the heating body and the heating assembly in line with the heating resistor;
  • - in Figure 3: the detail of a connection version of the electrodes with the current supply conductors;
  • - in Figure 4: the section of a second alternative embodiment of the heating assembly, cut in line with the heating resistor;
  • - in figure 5: the section of a third variant of the heating assembly comprising two identical thermistors, cut in line with the heating resistor.

L'appareil, suivant l'invention, visible en coupe sur la figure 1, comporte un corps de chauffe 1 bon conducteur de la chaleur, en alliage d'aluminium moulé par exemple. Ce corps de chauffe 1 est précédé d'un conduit d'amenée 2 des bâtonnets de colle, réalisé en un matériau isolant et suivi d'une buse 3 conductrice de la chaleur, appuyée sur le corps de chauffe par sa face 4 pour être chauffée. Sur la figure 1, on a représenté l'enveloppe de buse 5 réalisée en un matériau électriquement isolant et dont le but est d'isoler la buse métallique 3 du contact de l'utilisateur, la buse étant sous tension par l'intermédiaire du conduit de chauffe, si celui-ci est une électrode d'amenée de courant comme cela est décrit par la suite dans la première variante de l'invention conforme à la figure 2.The device according to the invention, visible in section in FIG. 1, comprises a heating body 1 that is a good conductor of heat, for example made of aluminum alloy. This heating body 1 is preceded by a supply duct 2 of the glue sticks, made of an insulating material and followed by a heat-conducting nozzle 3, supported on the heating body by its face 4 to be heated . In Figure 1, there is shown the nozzle casing 5 made of an electrically insulating material and the purpose of which is to isolate the metal nozzle 3 from contact with the user, the nozzle being energized via the conduit heating, if the latter is a current supply electrode as described below in the first variant of the invention according to FIG. 2.

Bien que sortant de l'objet principal de l'invention, on a représenté un système de fixation de l'enveloppe de buse 5 sur le corps de chauffe 1, consistant en un filetage mâle 6 de l'extrémité du corps de chauffe et sur lequel se visse l'enveloppe de buse 5 par sa partie taraudée 7.Although departing from the main object of the invention, there is shown a system for fixing the nozzle casing 5 on the heating body 1, consisting of a male thread 6 from the end of the heating body and on which is screwed on the nozzle casing 5 by its threaded part 7.

Bien entendu, dans le cas où le corps de chauffe 1 n'est pas une électrode d'amenée de courant, comme dans les variantes correspondant aux figures 4 et 5, l'enveloppe de buse 5 n'est plus nécessaire, et la buse métallique 3 peut être fixée directement sur le corps de chauffe 1 par tout moyen convenable.Of course, in the case where the heating body 1 is not a current supply electrode, as in the variants corresponding to Figures 4 and 5, the nozzle casing 5 is no longer necessary, and the nozzle metal 3 can be fixed directly to the heating body 1 by any suitable means.

L'ensemble des pièces intérieures décrites ci-dessus est contenu dans un boîtier 8, généralement en matériau isolant, comme par exemple un matériau thermoplastique moulé. Ce boîtier laisse apparaître l'extrémité 9 du conduit d'amenée 2, ainsi que la buse de sortie de colle fondue.All of the interior parts described above are contained in a housing 8, generally made of an insulating material, such as for example a molded thermoplastic material. This box reveals the end 9 of the supply duct 2, as well as the nozzle outlet for molten glue.

Une poignée 10 permet la prise en main de l'appareil, un cordon d'alimentation électrique 11 comporte deux conducteurs dont une extrémité est reliée à chaque électrode d'amenée de courant, par les connexions 12 et 13. Le corps de chauffe est entouré, dans sa partie médiane, de l'ensemble chauffant 14.A handle 10 allows the grip of the device, an electrical power cord 11 has two conductors, one end of which is connected to each current supply electrode, by connections 12 and 13. The heating body is surrounded , in its middle part, of the heating assembly 14.

La coupe de la figure 1 correspond à la variante de réalisation dont la section est représentée en figure 2. Dans cette variante, une seule thermistance est utilisée, et le corps de chauffe 1 constitue l'électrode intérieure. La thermistance 15 a la forme d'une pastille de faible épaisseur et dont les deux grandes faces parallèles sont les faces d'amenée de courant. On l'a représentée ici sous la forme d'un parallélépipède rectangle.The section of FIG. 1 corresponds to the variant embodiment, the cross section of which is shown in FIG. 2. In this variant, a single thermistor is used, and the heating body 1 constitutes the interior electrode. The thermistor 15 has the shape of a thin patch and whose two large parallel faces are the current supply faces. It has been represented here in the form of a rectangular parallelepiped.

L'une des grandes faces de la thermistance 15 appuie sur un méplat 16 réalisé sur l'extérieur du corps de chauffe 1, à proximité du canal de colle 17. Le méplat 16 est de dimensions au moins égales à celles de la grande face de la thermistance, afin d'avoir la plus grande surface de contact possible.One of the large faces of the thermistor 15 presses on a flat 16 produced on the outside of the heating body 1, near the adhesive channel 17. The flat 16 is of dimensions at least equal to those of the large face of the thermistor, in order to have the largest contact surface possible.

L'électrode extérieure 18 conductrice, réalisée par exemple en alliage d'aluminium, a la forme d'un profilé en U dont la partie plate centrale est en contact avec l'autre grande face de la thermistance, ses deux ailes 19 et 20 venant en contact avec l'extérieur du corps de chauffe, à travers un isolant souple 21. L'isolant 21 est constitué d'une ou plusieurs feuilles d'un matériau isolant électrique, avec lequel une épaisseur de l'ordre de 0,1 millimètre est suffisante pour assurer un bon isolement.The conductive outer electrode 18, made for example of aluminum alloy, has the shape of a U-shaped profile, the central flat part of which is in contact with the other large face of the thermistor, its two wings 19 and 20 coming in contact with the outside of the heating body, through a flexible insulator 21. The insulator 21 consists of one or more sheets of an electrical insulating material, with which a thickness of the order of 0.1 millimeter is sufficient to ensure good isolation.

Les ailes 19 et 20 sont en contact avec le corps de chauffe sur une grande surface, afin de permettre le bon transfert thermique de l'électrode 18 vers le corps de chauffe.The wings 19 and 20 are in contact with the heating body over a large area, in order to allow good thermal transfer from the electrode 18 to the heating body.

La tenue mécanique de l'ensemble chauffant autour du corps de chauffe est amenée, par exemple, par des bourrelets longitudinaux 22 et 23 du corps de chauffe, visibles sur la figure 2, en regard desquels prennent place des évidements longitudinaux 24 et 25 de l'électrode extérieure. L'électrode extérieure 18, en forme de U, ayant une élasticité suffisante, le montage s'effectue par une translation de l'électrode autour du corps de chauffe, du bas vers le haut, après y avoir enserré la thermistance 15 et l'isolant 21, qui sont légèrement serrés et donc maintenus entre les pièces 1 et 18 à la fin de la translation.The mechanical strength of the heating assembly around the heating body is brought, for example, by longitudinal beads 22 and 23 of the heating body, visible in FIG. 2, opposite which take place longitudinal recesses 24 and 25 of l 'external electrode. The outer electrode 18, in the shape of a U, having sufficient elasticity, the mounting is carried out by a translation of the electrode around the heating body, from the bottom to the top, after having enclosed the thermistor 15 and the insulator 21, which are slightly tightened and therefore held between the parts 1 and 18 at the end of the translation.

Il va de soi que les bourrelets du corps de chauffe 1 et les évidements de l'électrode 18 peuvent être remplacés par toutes autres formes convenables, par exemple, les bourrelets peuvent être placés sur l'électrode 18 et les évidements sur le corps de chauffe 1.It goes without saying that the beads of the heating body 1 and the recesses of the electrode 18 can be replaced by any other suitable shape, for example, the beads can be placed on the electrode 18 and the recesses on the heating body 1.

Les connexions du conducteur d'alimentation 11 aux électrodes peuvent être effectuées, par exemple, dans des alvéoles prévus dans les électrodes à cet effet. On a représenté, à titre d'exemple, en figure 2, un alvéole 26 de l'électrode 18 sur laquelle prendra place la connexion 12 visible en figure 1, mais non détaillée.The connections of the supply conductor 11 to the electrodes can be made, for example, in cells provided in the electrodes for this purpose. There is shown, by way of example, in Figure 2, a cell 26 of the electrode 18 on which will take the connection 12 visible in Figure 1, but not detailed.

La figure 3 représente cet alvéole 26, dans laquelle une extrémité dénudée 28 du conducteur d·alimen­ tation prend place, pour être sertie par le rabattage d'une patte 27. La même fixation peut être utilisée sur le corps de chauffe pour réaliser la connexion 13.Figure 3 shows this cell 26, in which a stripped end 28 of the power supply conductor takes place, to be crimped by folding down a tab 27. The same fixing can be used on the heating body to make the connection 13.

La figure 4 représente la section d'une seconde variante de l'invention, dans laquelle le conduit de chauffe 29 n'est plus utilisé comme électrode. Les électrodes sont constituées des pièces conductrices 31 et 32, en alliage d'aluminium par exemple, entourant la thermistance 33. L'électrode intérieure 31 a une surface au moins égale à celle d'une grande face de la thermistance ; elle a la forme d'une pastille de faible épaisseur dont une face est en contact avec la thermistance, l'autre face étant en contact avec un méplat du corps de chauffe 29, par l'intermédiaire d'un isolant souple 34.FIG. 4 represents the section of a second variant of the invention, in which the heating duct 29 is no longer used as an electrode. The electrodes consist of conductive parts 31 and 32, made of aluminum alloy for example, surrounding the thermistor 33. The internal electrode 31 has a surface at least equal to that of a large face of the thermistor; it has the shape of a thin pad, one face of which is in contact with the thermistor, the other face being in contact with a flat part of the heating body 29, by means of a flexible insulator 34.

Le méplat du corps de chauffe 29,placé en regard de la thermistance, a une surface de l'ordre de grandeur de celle de la thermistance, pour assurer un transfert thermique rapide.The flat portion of the heating body 29, placed opposite the thermistor, has an area of the order of magnitude of that of the thermistor, to ensure rapid heat transfer.

L'électrode extérieure 32 présente les mêmes caractéristiques que celles décrites ci-dessus, au sujet de la première variante.The external electrode 32 has the same characteristics as those described above, with regard to the first variant.

On a représenté sur les électrodes 31 et 32 des petits bourrelets 35 destinés à maintenir les pièces transversalement les unes aux autres après l'assemblage. On y a représenté aussi les alvéoles 36 et 37 destinés à recevoir les extrémités du conducteur d'alimentation.There are shown on the electrodes 31 and 32 small beads 35 intended to hold the parts transversely to each other after assembly. Also shown are the cells 36 and 37 intended to receive the ends of the supply conductor.

La figure 5 représente une troisième variante de l'invention, comportant deux thermistances identiques.FIG. 5 represents a third variant of the invention, comprising two identical thermistors.

L'utilisation de deux ou plusieurs thermistances est utile dans les cas où l'on désire une très forte puissance de chauffe, avec un conduit de chauffe et des thermistances de dimensions réduites. Les thermistances sont placées autour de l'axe du conduit de chauffe, afin d'être proches du canal central de colle.The use of two or more thermistors is useful in cases where a very high heating power is desired, with a heating duct and thermistors of reduced dimensions. The thermistors are placed around the axis of the heating duct, so as to be close to the central glue channel.

On trouve, en figure 5, le conduit de chauffe 38 avec son canal central 39, entouré sur sa périphérie d'un isolant souple 40. Deux électrodes en forme de U 41 et 42 sont en contact avec les deux thermistances 43 et 44, l'une étant l'électrode intérieure 41, l'autre l'électrode extérieure 42. Les thermistances sont ainsi alimentées électriquement en parallèle.FIG. 5 shows the heating duct 38 with its central channel 39, surrounded on its periphery by a flexible insulator 40. Two U-shaped electrodes 41 and 42 are in contact with the two thermistors 43 and 44, l 'one being the interior electrode 41, the other the exterior electrode 42. The thermistors are thus supplied electrically in parallel.

Chaque électrode comporte deux surfaces planes en regard des thermistances, ces surfaces étant au moins égales à celles des grandes faces des thermistances. Chaque électrode comporte également une ou plusieurs surfaces planes venant en regard des surfaces planes équi- lentes du corps de chauffe 38, afin d'assurer, à travers l'isolant 40, un transfert thermique rapide. L'électrode intérieure 41 comporte, en regard des thermistances 43 et 44, des parties 45 et 46 de faible épaisseur dont une face est en contact avec la thermistance correspondante, l'autre face étant en contact avec une forme correspondante du corps de chauffe, à travers l'isolant souple, chaque surface de contact étant au moins de l'ordre de grandeur de la surface d'une grande face de thermistance, afin d'assurer le meilleur transfert thermique.Each electrode has two flat surfaces facing the thermistors, these surfaces being at least equal to those of the large faces of the thermistors. Each electrode also has one or more planar surfaces facing the equivalent planar surfaces of the heating body 38, in order to ensure, through the insulator 40, rapid heat transfer. The internal electrode 41 comprises, opposite thermistors 43 and 44, parts 45 and 46 of small thickness, one face of which is in contact with the corresponding thermistor, the other face being in contact with a corresponding shape of the heating body, through the flexible insulation, each contact surface being at least of the order of magnitude of the surface of a large thermistor face, in order to ensure the best heat transfer.

On a représenté sur la figure 5 des ensembles de bourrelets 47 du corps de chauffe 38, placés en regard d'évidements 48 de l'électrode 41, afin d'assurer le maintien réciproque des deux pièces. De même, des bourrelets 49 placés sur l'électrode 41 et des bourrelets 50 placés sur l'électrode 42, en s'appuyant sur les arêtes des thermistances 43 et 44, assurent le maintien des thermistances et de l'électrode extérieure sur l'électrode intérieure, grâce à l'élasticité de l'électrode extérieure.FIG. 5 shows sets of beads 47 of the heating body 38, placed opposite recesses 48 of the electrode 41, in order to ensure the reciprocal maintenance of the two parts. Similarly, beads 49 placed on the electrode 41 and beads 50 placed on the electrode 42, resting on the edges of the thermistors 43 and 44, maintain the thermistors and the external electrode on the inner electrode, thanks to the elasticity of the outer electrode.

Dans tout ce qui précède, les surfaces de contact des électrodes avec le corps de chauffe, à travers l'isolant, sont planes. Il est clair que ces surfaces de contact peuvent avoir une forme différente, par exemple être des portions de cylindre, sans pour autant sortir du cadre de l'invention.In all of the above, the contact surfaces of the electrodes with the heating body, through the insulation, are flat. It is clear that these contact surfaces can have a different shape, for example being cylinder portions, without going beyond the ambit of the invention.

D'une manière plus générale, on pourra apporter à l'objet principal de l'invention toute variante utile, sans pour cela sortir de son cadre.More generally, we can bring to the main object of the invention any useful variant, without departing from its scope.

Par pastille de faible épaisseur, on entend notamment une pastille dont l'épaisseur est inférieure à l'une des dimensions de la section droite, notamment au rayon ou au petit côté de la section droite, et, plus particulièrement, est inférieure au cinquième et mieux au dixième de cette dimension.The term “thin pellet” is understood to mean in particular a pellet whose thickness is less than one of the dimensions of the cross section, in particular at radius or short side of the cross section, and, more particularly, is less than one fifth and better than one tenth of this dimension.

Claims (7)

1. Appareil applicateur de colle thermofusible, comprenant un corps de chauffe (1) de bâtonnets de colle, chauffé par une résistance électrique placée près de ce conduit de chauffe, caractérisé par le fait que la résistance électrique est constituée d'au moins une thermistance (15), à coefficient de température positif, ayant la forme d'une pastille de faible épaisseur dont les deux grandes faces opposées sont les faces d'amenée de courant, la surface extérieure du corps de chauffe (1) comportant un méplat (16) en regard de l'une des grandes faces de chaque thermistance (15), les deux dimensions de chaque méplat (16) étant au moins de l'ordre de grandeur de celles d'une grande face de chaque thermistance (15).1. Apparatus for applying hot-melt glue, comprising a heating body (1) of glue sticks, heated by an electrical resistance placed near this heating duct, characterized in that the electrical resistance consists of at least one thermistor (15), with a positive temperature coefficient, in the form of a thin pellet, the two opposite large faces of which are the current supply faces, the external surface of the heating body (1) comprising a flat (16 ) opposite one of the large faces of each thermistor (15), the two dimensions of each flat (16) being at least of the order of magnitude of those of a large face of each thermistor (15). 2. Appareil suivant la revendication 1, caractérisé en ce que le corps de chauffe (1) est/en même temps une électrode d'amenée du courant sur la ou les thermistances (15), l'autre électrode (18), dite électrode extérieure, étant constituée d'un barreau profilé métallique prenant place autour du corps de chauffe et à l'extérieur de la ou des thermistances (15), cette électrode extérieure (18) comportant un méplat en regard de l'une des grandes faces de chaque thermistance (15), les deux dimensions de chaque méplat étant au moins de l'ordre de grandeur de celles d'une grande face de chaque thermistance (15).2. Apparatus according to claim 1, characterized in that the heating body (1) is / at the same time a current supply electrode on the thermistor (s) (15), the other electrode (18), called the electrode outer, consisting of a metal profiled bar taking place around the heating body and outside of the thermistor (s) (15), this outer electrode (18) comprising a flat face opposite one of the large faces of each thermistor (15), the two dimensions of each flat being at least of the order of magnitude of those of a large face of each thermistor (15). 3. Appareil suivant la revendication 1, caractérisé en ce que la ou les thermistances (33) sont placées entre deux électrodes (31, 32) métalliques ayant la forme de barreaux profilés entourant en partie le corps de chauffe (29), l'un formant l'électrode intérieure, l'autre formant l'électrode extérieure, la ou les thermistances (33) étant serrées sur leurs plus grandes surfaces entre ces électrodes (31, 32), qui comportent chacune un méplat en regard de l'une des grandes faces de chaque thermistance, les deux dimensions de chaque méplat étant au moins de l'ordre de grandeur de celles d'une grande face de chaque thermistance (33).3. Apparatus according to claim 1, characterized in that the thermistor (s) (33) are placed between two metal electrodes (31, 32) having the form of profiled bars partially surrounding the heating body (29), one forming the inner electrode, the other forming the outer electrode, the thermistor (s) (33) being clamped over their larger surfaces between these electrodes (31, 32), which comprises each try a flat facing one of the large faces of each thermistor, the two dimensions of each flat being at least of the order of magnitude of those of a large face of each thermistor (33). 4. Appareil suivant la revendication 1, caractérisé en ce que l'électrode extérieure (18) de la ou des thermistances (15) comporte au moins une partie plane ou curviligne, venant prendre place contre une partie de même forme prévue à cet effet sur la paroi extérieure du corps de chauffe (1), par l'intermédiaire d'un isolant (21) souple de faible épaisseur serré entre les deux pièces, la surface de ces parties en contact étant de l'ordre de grandeur de celle d'une grande face de chaque thermistance (15), afin de transmettre au corps de chauffe (1) la chaleur recueillie par cette électrode (18) extérieure.4. Apparatus according to claim 1, characterized in that the external electrode (18) of the thermistor (s) (15) comprises at least one flat or curvilinear part, coming to take place against a part of the same shape provided for this purpose on the outer wall of the heating body (1), by means of a flexible insulator (21) of thin thickness clamped between the two parts, the surface of these parts in contact being of the order of magnitude of that of a large face of each thermistor (15), in order to transmit to the heating body (1) the heat collected by this external electrode (18). 5. Appareil suivant la revendication 1 et l'une quelconque des revendications 2 à 4, caractérisé par le fait que le corps de chauffe et les électrodes sont réalisés en alliage d'aluminium.5. Apparatus according to claim 1 and any one of claims 2 to 4, characterized in that the heating body and the electrodes are made of aluminum alloy. 6. Appareil suivant la revendication 1 et l'une quelconque des revendications 2 à 4, caractérisé en ce que le corps de chauffe (1) comporte au moins un bourrelet (22, 23) ou un évidement parallèle à l'axe principal du corps de chauffe (1), placé en regard d'un évidement (24, 25) ou d'un bourrelet de l'une des électrodes (18), le bourrelet (22, 23) d'une pièce entrant en partie dans l'évidement (24, 25) de l'autre pièce pour réaliser le maintien mécanique de l'assemblage.6. Apparatus according to claim 1 and any one of claims 2 to 4, characterized in that the heating body (1) comprises at least one bead (22, 23) or a recess parallel to the main axis of the body heater (1), placed opposite a recess (24, 25) or a bead of one of the electrodes (18), the bead (22, 23) of a part entering partly into the recess (24, 25) of the other part to achieve mechanical maintenance of the assembly. 7. Appareil suivant la revendication 1 et l'une quelconque des revendications 2 à 3, dans lequel les électrodes d'amenée de courant comportent des alvéoles (26) avec une partie rabattable, dans lesquels prennent place et sont serties les extrémités (12) de conducteurs d'alimentation.7. Apparatus according to claim 1 and any one of claims 2 to 3, wherein the current supply electrodes comprise cells (26) with a folding part, in which take place and are crimped the ends (12) supply conductors.
EP82401751A 1981-09-29 1982-09-28 Apparatus for applying a thermofusible glue Withdrawn EP0076735A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MC1549 1981-09-29
MC811549A MC1432A1 (en) 1981-09-29 1981-09-29 APPARATUS FOR APPLYING A HOT-MELT ADHESIVE

Publications (1)

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EP0076735A1 true EP0076735A1 (en) 1983-04-13

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EP82401751A Withdrawn EP0076735A1 (en) 1981-09-29 1982-09-28 Apparatus for applying a thermofusible glue

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EP (1) EP0076735A1 (en)
MC (1) MC1432A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0147627A2 (en) * 1983-11-25 1985-07-10 Reinhard Ursprung Heating element for a spray gun
US5362164A (en) * 1993-09-23 1994-11-08 Electro-Matic Staplers, Inc. Glue gun heat housing
US5688421A (en) * 1991-10-11 1997-11-18 Walton; William M. Dispenser for heat-liquefiable material with contiguous PTC heater and heat exchanging member
US6838642B2 (en) * 2001-02-02 2005-01-04 Isaberg Rapid Ab Thermofusible glue applicator with heating element track pressed against heating body
US7037104B2 (en) * 2002-08-02 2006-05-02 Mary Katherine Azzinaro Device and method for exposing a candle wick embedded in candle wax
CN107159530A (en) * 2017-06-16 2017-09-15 奉化市威优特电器有限公司 A kind of heater of thermosol gelgun

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055350A2 (en) * 1980-12-29 1982-07-07 Steinel GmbH &amp; Co. KG Device for fluidifying a fusible glue

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055350A2 (en) * 1980-12-29 1982-07-07 Steinel GmbH &amp; Co. KG Device for fluidifying a fusible glue

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0147627A2 (en) * 1983-11-25 1985-07-10 Reinhard Ursprung Heating element for a spray gun
EP0147627A3 (en) * 1983-11-25 1986-02-19 Reinhard Ursprung Heating element for a spray gun
US5688421A (en) * 1991-10-11 1997-11-18 Walton; William M. Dispenser for heat-liquefiable material with contiguous PTC heater and heat exchanging member
US5362164A (en) * 1993-09-23 1994-11-08 Electro-Matic Staplers, Inc. Glue gun heat housing
GB2282187A (en) * 1993-09-23 1995-03-29 Electro Matic Staplers Inc Heating device for use in a glue gun
FR2710281A1 (en) * 1993-09-23 1995-03-31 Electro Matic Staplers Inc Glue gun melting chamber.
GB2282187B (en) * 1993-09-23 1995-11-08 Electro Matic Staplers Inc Glue gun melt housing
US6838642B2 (en) * 2001-02-02 2005-01-04 Isaberg Rapid Ab Thermofusible glue applicator with heating element track pressed against heating body
US7037104B2 (en) * 2002-08-02 2006-05-02 Mary Katherine Azzinaro Device and method for exposing a candle wick embedded in candle wax
CN107159530A (en) * 2017-06-16 2017-09-15 奉化市威优特电器有限公司 A kind of heater of thermosol gelgun

Also Published As

Publication number Publication date
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