EP0061040B1 - Melting and depositing apparatus for a hot melt glue - Google Patents

Melting and depositing apparatus for a hot melt glue Download PDF

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Publication number
EP0061040B1
EP0061040B1 EP82101725A EP82101725A EP0061040B1 EP 0061040 B1 EP0061040 B1 EP 0061040B1 EP 82101725 A EP82101725 A EP 82101725A EP 82101725 A EP82101725 A EP 82101725A EP 0061040 B1 EP0061040 B1 EP 0061040B1
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EP
European Patent Office
Prior art keywords
melting
melting chamber
melt adhesive
applicator according
melting device
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.)
Expired
Application number
EP82101725A
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German (de)
French (fr)
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EP0061040A3 (en
EP0061040A2 (en
Inventor
Alfred Dettelbach
Roland Henzler
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Reich Spezialmaschinen GmbH
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Reich Spezialmaschinen GmbH
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Priority to AT82101725T priority Critical patent/ATE14682T1/en
Publication of EP0061040A2 publication Critical patent/EP0061040A2/en
Publication of EP0061040A3 publication Critical patent/EP0061040A3/en
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Publication of EP0061040B1 publication Critical patent/EP0061040B1/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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/001—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work incorporating means for heating or cooling the liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • Hot-melt adhesive units are fed from a magazine through a feed opening to the melting chamber, a closure slide connected to the delivery piston blocking the magazine during the delivery stroke.
  • hot melt adhesive should be understood to mean all plastic-based adhesives which are solid at room temperature and which are liquefied by application to the workpiece by heating and which solidify immediately after the workpieces have been joined together.
  • the original commercial form of hot melt adhesive is the granulate; it therefore makes sense to also use granules in a melting and application device of the type mentioned at the beginning. However, this would be partially pushed back into the storage container by the delivery stroke and jam the delivery piston in the melting chamber.
  • the inventive use of a slide valve separate from the delivery piston in the feed opening of the melting chamber ensures that the storage container is securely closed after the filling process.
  • the melt adhesive granulate can then be pressed by the delivery piston without any problems in the direction of the melt wall.
  • the use of a limit switch and associated delay elements which can be actuated by the delivery piston ensures that the delivery stroke only begins after the melting chamber has been filled with granules and the closure slide has closed the feed opening.
  • both the slide valve and the opposite wall of the melting chamber are each provided with a knife edge which reliably separates the melt adhesive granules located in the storage container from the filling of the melting chamber.
  • the storage container can be exchanged for rapid change of the type of hot-melt adhesive, its opening facing the melting chamber being closable by a locking slide.
  • the storage container placed on the melting chamber can be secured by a lock, which at the same time interacts with an interrupter switch in such a way that the displacement unit for actuating the closure slide can only be actuated when the lock is in its locking position.
  • a melting device 1 is connected to an application device 2, which in the present exemplary embodiment is provided with a nozzle body 3, but can also be designed as an application roller.
  • the melting device 1 has a melting chamber 4, which at its end facing the application device 2 by a heatable. Melting insert 5 is completed.
  • a delivery piston 6, which is displaceably mounted in the melting chamber 4, is connected to the piston 7 of a compressed air cylinder 8.
  • first limit switch 9 and second limit switch 10 are arranged outside each of compressed air cylinders 8.
  • the melting chamber 4 of square cross section is enclosed by a wall 11 which is interrupted at the top by a feed opening 12.
  • a slide valve 13 is slidably mounted and movable in the direction of the feed opening 12 by a sliding unit 14 designed as a compressed air cylinder with a compressed air piston.
  • the slide valve 13 has a knife edge 15 which is opposite a knife edge 16 in the wall 11.
  • a storage container 17 is removably arranged on the wall 11, which widens conically upwards and serves to hold the solid hot-melt adhesive granulate 18.
  • the storage container 17 has bars 19, 19 'on both sides (FIG. 2), the centering pins 20 of which engage in bores 21 which are provided in eyes 22 of wall 11.
  • a locking pin 23 is also connected to the bolt 19, which is pivoted in the locking position of bolt 19 under a tab 24 of storage container 17.
  • the storage container 17 is provided at its lower end with a locking slide 27 which closes the outlet opening when the storage container 17 is removed from the melting device 1, as long as there is still melt adhesive granulate 18 in the storage container 17.
  • the reservoir 17 filled with hot-melt adhesive granules 18 is first placed on the wall 11 of the melting chamber 4 with the blocking slide 27 closed. By pivoting the latches 19, 19 'via the lever 26, the reservoir 17 is locked to the wall 11 and the circuit breaker 25 is actuated at the same time.
  • melt adhesive granulate 18 can get into the melting chamber 4 through the feed opening 12 after the opening of the slide valve 27 and fill it.
  • the slide valve 13 closes the feed opening 12 and thereby separates the melting chamber 4 safely from the storage container 17.
  • the piston 7 is then acted upon with a relatively low idle pressure by means of a delay element (not shown) so that the delivery piston 6 does so in the Melting chamber 4 located hot melt adhesive granules 18 presses in the direction of the heated melt insert 5.
  • the parts of the hot-melt adhesive granules which are in contact with them are melted.
  • the maintenance of the static pressure is intended to prevent the elastic, less compressed granulate from displacing the piston 7 too far back.
  • the further function of the melting and application device now corresponds to the melting and application device described in DE-OS 27 31 799, the feed piston 6 being controlled by the front and rear edges of a workpiece, not shown, conveyed by an edge banding machine in a continuous manner via pushbutton switches is that the piston 7 is acted upon by a higher pressure and that the rotary valve 28 is rotated via a compressed air piston, not shown, so that the nozzle openings 29 open and molten hot melt adhesive can reach the narrow sides of the workpiece.
  • the first limit switch 9 is inductively influenced by the piston 7 so that this controls the delivery piston 6 back into its drawn filling position via a compressed air valve, not shown.
  • the displacement unit 14 is also acted on in such a way that the slide valve 13 opens the feed opening 12 so that further melt adhesive granules 18 can get into the melting chamber 4.
  • Another time delay element causes the supply opening 12 to be closed again by the slide valve 13 and the piston 7 to be acted upon by a low resting pressure after a certain time.
  • a delay element delays the backward movements of the delivery piston 6 and the slide valve 13 until the workpiece has completely passed over the nozzle openings 29.
  • a second limit switch 10 can also be provided instead of a delay element for reversing the delivery piston 6 and the closure slide 13, said limit switch 10 being inductively actuable by the piston 7 in its rearmost filling position.
  • a time relay (not shown) connected to the first limit switch 9 and monitoring the movement of the piston 7 and the slide valve 13 can be provided as a further safeguard.
  • the piston 7 can immediately turn back after reaching the filling position and reach the limit switch 9.
  • the time relay controls a locking device on the input side of the edge banding machine into a locking position so that workpieces can no longer be input. This is only possible again after refilling the storage container 17 with hot-melt adhesive granulate.
  • an application roller can also be used instead of a nozzle body 3 with nozzle openings 29, to which the liquid hot-melt adhesive is fed again by the melting device 1.

Abstract

An apparatus for melting and applying meltable adhesive, especially in combination with edge gluing machines for continuously advancing work pieces, includes a melting chamber (4) for the meltable granular adhesive material. The melting chamber is equipped with a heatable melting insert (5). A supply container (17) for the solid meltable granular adhesive material (18) is arranged to open into the melting chamber (4). A power driven closure slide (13) is arranged between the melting chamber (4) and the supply container (17) for the granular adhesive material. The closure slide (13) is operated in such a manner that filling the melting chamber (4) with granular adhesive material (18) is free of trouble and the adhesive material may be properly processed without any difficulties, especially without any jamming.

Description

Die Erfindung betrifft eine Vorrichtung gemäß Oberbegriff von Anspruch 1.The invention relates to a device according to the preamble of claim 1.

Dazu ist es aus der DE-A 27 31 799 bekannt, festen Schmelzkleber in Form von zylindrischen Einheiten in einer Schmelzkammer durch einen Förderkolben gegen eine Schmelzwand zu drücken und den geschmolzenen Schmelzkleber über eine Auftragsvorrichtung auf die Schmalfläche eines Werkstücks aufzutragen.For this purpose, it is known from DE-A 27 31 799 to press solid hot melt adhesive in the form of cylindrical units in a melting chamber through a delivery piston against a melting wall and to apply the melted hot melt adhesive to the narrow surface of a workpiece using an application device.

Schmelzklebereinheiten werden dabei von einem Magazin über eine Zuführöffnung der Schmelzkammer zugeführt, wobei ein mit dem Förderkolben verbundener Verschlußschieber das Magazin während des Förderhubes absperrt.Hot-melt adhesive units are fed from a magazine through a feed opening to the melting chamber, a closure slide connected to the delivery piston blocking the magazine during the delivery stroke.

Unter Schmelzkleber seien im folgenden alle bei Raumtemperatur festen Kleber auf Kunststoffbasis verstanden, die zur Auftragung auf das Werkstück durch Erhitzung verflüssigt werden und die nach dem Zusammenfügen der Werkstücke sofort erstarren.In the following, hot melt adhesive should be understood to mean all plastic-based adhesives which are solid at room temperature and which are liquefied by application to the workpiece by heating and which solidify immediately after the workpieces have been joined together.

Die ursprüngliche handelsübliche Form von Schmelzkleber ist das Granulat ; es liegt daher nahe, auch bei einer Schmelz- und Auftragsvorrichtung der eingangs genannten Art Granulat zu verwenden. Dieses würde jedoch vom Förderhub teilweise wieder in den Vorratsbehälter zurückgedrückt werden und den Förderkolben in der Schmelzkammer verklemmen.The original commercial form of hot melt adhesive is the granulate; it therefore makes sense to also use granules in a melting and application device of the type mentioned at the beginning. However, this would be partially pushed back into the storage container by the delivery stroke and jam the delivery piston in the melting chamber.

Aufgabe der vorliegenden Erfindung ist es daher, eine Schmelz- und Auftragsvorrichtung der eingangs genannten Art zu schaffen, mit der auch Schmelzkleber in Granulatform einwandfrei verarbeitet werden kann und die ein störungsfreies Füllen der Schmelzkammer ermöglicht.It is therefore an object of the present invention to provide a melting and application device of the type mentioned at the outset, with which hot-melt adhesive in granulate form can also be processed properly and which enables the melting chamber to be filled without problems.

Diese Aufgabe wird durch die im kennzeichnenden Teil von Anspruch 1 angegebenen Merkmale gelöst..This object is achieved by the features specified in the characterizing part of claim 1.

Durch die erfindungsgemäße Verwendung eines vom Förderkolben getrennten Verschlußschiebers in der Zuführöffnung der Schmelzkammer ist ein sicherer Verschluß des Vorratsbehälters nach dem Füllvorgang gewährleistet. Das Schmelzklebergranulat kann dann vom Förderkolben störungsfrei in Richtung Schmelzwand gedrückt werden. Durch die Verwendung eines Endschalters und damit verbundenen Verzögerungselementen der vom Förderkolben betätigbar ist, wird gewährleistet, daß der Förderhub erst einsetzt, nachdem die Schmelzkammer mit Granulat gefüllt ist und der Verschlußschieber die Zuführöffnung verschlossen hat.The inventive use of a slide valve separate from the delivery piston in the feed opening of the melting chamber ensures that the storage container is securely closed after the filling process. The melt adhesive granulate can then be pressed by the delivery piston without any problems in the direction of the melt wall. The use of a limit switch and associated delay elements which can be actuated by the delivery piston ensures that the delivery stroke only begins after the melting chamber has been filled with granules and the closure slide has closed the feed opening.

Bei einer vorteilhaften Ausführungsform der Erfindung ist sowohl der Verschlußschieber als auch die gegenüberliegende Wand der Schmelzkammer mit je einer Messerkante versehen, die das im Vorratsbehälter befindliche Schmelzklebergranulat sicher von der Füllung der Schmelzkammer trennt.In an advantageous embodiment of the invention, both the slide valve and the opposite wall of the melting chamber are each provided with a knife edge which reliably separates the melt adhesive granules located in the storage container from the filling of the melting chamber.

Zum raschen Wechsel der Schmelzklebersorte läßt sich der Vorratsbehälter auswechseln, wobei seine der Schmelzkammer zugewandte Öffnung durch einen Sperrschieber verschließbar ist.The storage container can be exchanged for rapid change of the type of hot-melt adhesive, its opening facing the melting chamber being closable by a locking slide.

Der auf die Schmelzkammer aufgesetzte Vorratsbehälter läßt sich durch eine Verriegelung sichern, die gleichzeitig so mit einem Unterbrecherschalter zusammenwirkt, daß die Verschiebeeinheit zur Betätigung des Verschlußschiebers nur dann betätigbar ist, wenn sich die Verriegelung in ihrer Verriegelungssteliung befindet.The storage container placed on the melting chamber can be secured by a lock, which at the same time interacts with an interrupter switch in such a way that the displacement unit for actuating the closure slide can only be actuated when the lock is in its locking position.

Im folgenden ist ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die Zeichnungen näher beschrieben.An exemplary embodiment of the invention is described in more detail below with reference to the drawings.

Es zeigen :

  • Figur 1 Gesamte Schmelz- und Auftragsvorrichtung schematisch, teilweise geschnitten
  • Figur 2 Schnitt nach Linie li-li in Fig. 1
Show it :
  • Figure 1 Entire melting and application device schematically, partially cut
  • Figure 2 section along line li-li in Fig. 1st

Wie Fig. 1 zeigt, ist eine Schmelzvorrichtung 1 mit einer Auftragsvorrichtung 2 verbunden, die beim vorliegenden Ausführungsbeispiel mit einem Düsenkörper 3 versehen ist, doch auch als Auftragsrolle ausgebildet sein kann. Die Schmelzvorrichtung 1 weist eine Schmelzkammer 4 auf, die an ihrem der Auftragsvorrichtung 2 zugewandten Ende durch einen beheizbaren . Schmelzeinsatz 5 abgeschlossen ist. Ein in der Schmelzkammer 4 verschiebbar gelagerter Förderkolben 6 ist mit dem Kolben 7 eines Druckluftzylinders 8 verbunden.As shown in FIG. 1, a melting device 1 is connected to an application device 2, which in the present exemplary embodiment is provided with a nozzle body 3, but can also be designed as an application roller. The melting device 1 has a melting chamber 4, which at its end facing the application device 2 by a heatable. Melting insert 5 is completed. A delivery piston 6, which is displaceably mounted in the melting chamber 4, is connected to the piston 7 of a compressed air cylinder 8.

Jeweils am Ende des Hubes von Kolben 7 ist außerhalb von Druckluftzylinder 8 je ein induktiv betätigbarer erster Endschalter 9 und zweiter Endschalter 10 angeordnet.At the end of the stroke of piston 7, an inductively actuated first limit switch 9 and second limit switch 10 are arranged outside each of compressed air cylinders 8.

Die Schmelzkammer 4 von quadratischem Querschnitt ist von einer Wand 11 umschlossen, die nach oben durch eine Zuführöffnung 12 unterbrochen ist. In der oberen Wand 11 ist ein Verschlußschieber 13 verschiebbar gelagert und durch eine als Druckluftzylinder mit Druckluftkolben ausgebildete Verschiebeeinheit 14 in Richtung Zuführöffnung 12 bewegbar. An seinem der Zuführöffnung 12 zugewandten Ende weist der Verschlußschieber 13 eine Messerkante 15 auf, der eine Messerkante 16 in der Wand 11 gegenüberliegt.The melting chamber 4 of square cross section is enclosed by a wall 11 which is interrupted at the top by a feed opening 12. In the upper wall 11, a slide valve 13 is slidably mounted and movable in the direction of the feed opening 12 by a sliding unit 14 designed as a compressed air cylinder with a compressed air piston. At its end facing the feed opening 12, the slide valve 13 has a knife edge 15 which is opposite a knife edge 16 in the wall 11.

In die Zuführöffnung 12 mündend ist an der Wand 11 ein Vorratsbehälter 17 abnehmbar angeordnet, der sich nach oben konisch erweitert und zur Aufnahme des festen Schmelzkleber-Granulats 18 dient.Opening into the feed opening 12, a storage container 17 is removably arranged on the wall 11, which widens conically upwards and serves to hold the solid hot-melt adhesive granulate 18.

Am unteren Ende weist der Vorratsbehälter 17 zu beiden Seiten Riegel 19, 19' auf (Fig. 2), deren Zentrierzapfen 20 in Bohrungen 21 eingreifen, die in Augen 22 von Wand 11 angebracht sind. Mit dem Riegel 19 ist ferner ein Sperrzapfen 23 verbunden, der in der Verriegelungsstellung von Riegel 19 unter eine Lasche 24 von Vorratsbehälter 17 geschwenkt wird.At the lower end, the storage container 17 has bars 19, 19 'on both sides (FIG. 2), the centering pins 20 of which engage in bores 21 which are provided in eyes 22 of wall 11. A locking pin 23 is also connected to the bolt 19, which is pivoted in the locking position of bolt 19 under a tab 24 of storage container 17.

In der Verriegelungsstellung betätigt Riegel 19' weiterhin einen Unterbrecherschalter 25, der so mit einem nicht dargestellten Schalter der Verschiebeeinheit 14 zusammenwirkt, daß diese den Verschlußschieber 13 nur bewegt, wenn Riegel 19 den Unterbrecherschalter 25 betätigt. Sowohl das Einschwenken von Sperrzapfen 23 als auch die Betätigung von Unterbrecherschalter 25 erfolgt durch ein Verschwenken der Riegel 19, 19' mit den Hebeln 26.In the locked position, bolt 19 'continues to actuate an interrupter switch 25, which interacts with a switch (not shown) of the displacement unit 14 in such a way that it only moves the closure slide 13 when bolt 19 operated the breaker switch 25. Both the pivoting of the locking pin 23 and the actuation of the interrupter switch 25 are carried out by pivoting the latches 19, 19 'with the levers 26.

Der Vorratsbehälter 17 ist an seinem unteren Ende mit einem Sperrschieber 27 versehen, der die Austrittsöffnung verschließt, wenn der Vorratsbehälter 17 von der Schmelzvorrichtung 1 abgenommen wird, solange sich noch Schmelzkleber-Granulat 18 im Vorratsbehälter 17 befindet.The storage container 17 is provided at its lower end with a locking slide 27 which closes the outlet opening when the storage container 17 is removed from the melting device 1, as long as there is still melt adhesive granulate 18 in the storage container 17.

Zum Betrieb der erfindungsgemäßen Schmelz-und Auftragsvorrichtung wird zunächst der mit Schmelzkleber-Granulat 18 gefüllte Vorratsbehälter 17 bei geschlossenem Sperrschieber 27 auf die Wand 11 von Schmelzkammer 4 aufgesetzt. Durch Verschwenken der Riegel 19, 19' über Hebel 26 wird der Vorratsbehälter 17 mit der Wand 11 verriegelt und gleichzeitig der Unterbrecherschalter 25 betätigt.To operate the melting and application device according to the invention, the reservoir 17 filled with hot-melt adhesive granules 18 is first placed on the wall 11 of the melting chamber 4 with the blocking slide 27 closed. By pivoting the latches 19, 19 'via the lever 26, the reservoir 17 is locked to the wall 11 and the circuit breaker 25 is actuated at the same time.

Nach Betätigung eines nicht dargestellten Startschalters werden Verschlußschieber 13 und Förderkolben 6 in ihre in Fig. 1 ausgezogen gezeichnete Füllstellung verschoben, so daß Schmelzkleber-Granulat 18 nach dem Öffnen von Sperrschieber 27 durch die Zuführöffnung 12 in die Schmelzkammer 4 gelangen und diese ausfüllen kann.After actuation of a start switch (not shown), slide valve 13 and delivery piston 6 are moved into their filling position shown in solid lines in FIG. 1, so that melt adhesive granulate 18 can get into the melting chamber 4 through the feed opening 12 after the opening of the slide valve 27 and fill it.

Nach dem Umschalten des Startschalters auf Betriebsstellung schließt der Verschlußschieber 13 die Zuführöffnung 12 und trennt dabei die Schmelzkammer 4 sicher vom Vorratsbehälter 17. Über ein nicht dargestelltes Verzögerungselement wird daraufhin der Kolben 7 so mit einem verhältnismäßig geringen Ruhedruck beaufschlagt, daß der Förderkolben 6 das in der Schmelzkammer 4 befindliche Schmelzkleber- Granulat 18 in Richtung auf den beheizten Schmelzeinsatz 5 drückt. Dabei werden die an diesen anliegenden Teile des Schmelzklebe7r-Granulats geschmolzen. Die Aufrechterhaltung des Ruhedrucks soll verhindern, daß das elastische, wenig verdichtete Granulat den Kolben 7 zu weit nach hinten verschiebt.After switching the start switch to the operating position, the slide valve 13 closes the feed opening 12 and thereby separates the melting chamber 4 safely from the storage container 17. The piston 7 is then acted upon with a relatively low idle pressure by means of a delay element (not shown) so that the delivery piston 6 does so in the Melting chamber 4 located hot melt adhesive granules 18 presses in the direction of the heated melt insert 5. In the process, the parts of the hot-melt adhesive granules which are in contact with them are melted. The maintenance of the static pressure is intended to prevent the elastic, less compressed granulate from displacing the piston 7 too far back.

Die weitere Funktion der Schmelz- und Auftragsvorrichtung entspricht jetzt der in der DE-OS 27 31 799 beschriebenen Schmelz- und Auftragsvorrichtung, wobei der Förderkolben 6 durch die Vorder- und Hinterkante eines nicht dargestellten, durch eine Kantenanleimmaschine im Durchlauf geförderten Werkstücks über Tastschalter so gesteuert wird, daß der Kolben 7 jeweils mit einem höheren Druck beaufschlagt wird und daß der Drehschieber 28 über einen nicht dargestellten Druckluftkolben so verdreht wird, daß sich die Düsenöffnungen 29 öffnen und geschmolzener Schmelzkleber auf die seitlichen Schmalflächen des Werkstücks gelangen kann.The further function of the melting and application device now corresponds to the melting and application device described in DE-OS 27 31 799, the feed piston 6 being controlled by the front and rear edges of a workpiece, not shown, conveyed by an edge banding machine in a continuous manner via pushbutton switches is that the piston 7 is acted upon by a higher pressure and that the rotary valve 28 is rotated via a compressed air piston, not shown, so that the nozzle openings 29 open and molten hot melt adhesive can reach the narrow sides of the workpiece.

Gelangt der Förderkolben 6 am Ende seines Förderhubs in die in Fig. 1 strichpunktiert gezeichnete Stellung, dann wird der erste Endschalter 9 von Kolben 7 induktiv so beeinflußt, daß dieser über ein nicht dargestelltes Druckluftventil den Förderkolben 6 wieder in seine ausgezogen gezeichnete Füllstellung steuert.If the delivery piston 6 at the end of its delivery stroke in the position shown in dash-dotted lines in Fig. 1, then the first limit switch 9 is inductively influenced by the piston 7 so that this controls the delivery piston 6 back into its drawn filling position via a compressed air valve, not shown.

Uber ein Verzögerungselement wird ebenso Verschiebeeinheit 14 so beaufschlagt, daß Verschlußschieber 13 die Zuführöffnung 12 öffnet, so daß weiteres Schmelzkleber-Granulat 18 in die Schmelzkammer 4 gelangen kann.Via a delay element, the displacement unit 14 is also acted on in such a way that the slide valve 13 opens the feed opening 12 so that further melt adhesive granules 18 can get into the melting chamber 4.

Ein weiteres Zeitverzögerungselement bewirkt nach einer gewissen Zeit wieder das Schließen der Zuführöffnung 12 durch den Verschlußschieber 13 und die Beaufschlagung von Kolben 7 durch einen niederen Ruhedruck.Another time delay element causes the supply opening 12 to be closed again by the slide valve 13 and the piston 7 to be acted upon by a low resting pressure after a certain time.

Sollte sich jedoch beim Erreichen der strichpunktiert gezeichneten Endstellung von Förderkolben 6 ein Werkstück vor den Düsenöffnungen 29 befinden, dann bewirkt ein nicht dargestelltes Verzögerungselement eine Verzögerung der Rückwärtsbewegungen von Förderkolben 6 und Verschlußschieber 13, bis das Werkstück die Düsenöffnungen 29 völlig überfahren hat.However, if a workpiece is located in front of the nozzle openings 29 when the end position of the delivery piston 6 shown in dash-dotted lines is reached, then a delay element (not shown) delays the backward movements of the delivery piston 6 and the slide valve 13 until the workpiece has completely passed over the nozzle openings 29.

Beim Füllen der Schmelzkammer 4 mit Schmelzkleber-Granulat 18 kann zum Umsteuern des Förderkolbens 6 und des Verschlußschiebers 13 anstelle eines Verzögerungselements auch ein zweiter Endschalter 10 vorgesehen sein, der vom Kolben 7 in seiner hintersten Füllstellung induktiv betätigbar ist.When the melting chamber 4 is filled with hot-melt adhesive granulate 18, a second limit switch 10 can also be provided instead of a delay element for reversing the delivery piston 6 and the closure slide 13, said limit switch 10 being inductively actuable by the piston 7 in its rearmost filling position.

Für den Fall, daß sich im Vorratsbehälter 17. kein Schmelzkleber-Granulat 18 mehr befindet, kann als weitere Sicherung ein mit dem 1. Endschalter 9 verbundenes, nicht dargestelltes Zeitrelais vorgesehen sein, das die Bewegung vom Kolben 7 und Verschlußschieber 13 überwacht.In the event that there is no hot melt adhesive granulate 18 in the storage container 17, a time relay (not shown) connected to the first limit switch 9 and monitoring the movement of the piston 7 and the slide valve 13 can be provided as a further safeguard.

Befindet sich nämlich kein Granulat in der Schmelzkammer 4, dann kann Kolben 7 nach Erreichen der Füllstellung sofort wieder umkehren und zum Endschalter 9 gelangen. In diesem Fall steuert das Zeitrelais ein Sperrorgan an der Eingabeseite der Kantenanleimmaschine so in eine Sperrstellung, daß keine Werkstücke mehr eingegeben werden können. Dies ist erst wieder nach den Nachfüllen des Vorratsbehälters 17 mit Schmelzkleber-Granulat möglich.If there is no granulate in the melting chamber 4, the piston 7 can immediately turn back after reaching the filling position and reach the limit switch 9. In this case, the time relay controls a locking device on the input side of the edge banding machine into a locking position so that workpieces can no longer be input. This is only possible again after refilling the storage container 17 with hot-melt adhesive granulate.

Zum Auftragen des flüssigen Schmelzklebers auf die Seitenfläche des Werkstücks kann anstelle eines Düsenkörpers 3 mit Düsenöffnungen 29 auch eine Auftragsrolle verwendet werden, der der flüssige Schmelzkleber wieder von der Schmeizvorrichtung 1 zugeführt wird.To apply the liquid hot-melt adhesive to the side surface of the workpiece, an application roller can also be used instead of a nozzle body 3 with nozzle openings 29, to which the liquid hot-melt adhesive is fed again by the melting device 1.

Claims (8)

1. Melting device and applicator for hot melt adhesive, in particular for edge banding machines for continuously moving workpieces, comprising
a) a melting chamber (4) having a heatable melting wall (5) with discharge openings provided at its end facing away from the applicator (2),
b) a power-operated delivery piston (6) disposed in sliding relationship within the melting chamber for being controlled by the workpiece, and
c) an inlet opening (12) to the melting chamber (4) which communicates with a supply vessel (17) for the solid hot melt adhesive (18) and which can be shut off by a slide gate, characterized in that a power-operated actuating unit (14) is provided for displacing the slide gate which can be operated independently of the delivery piston (6). and that a first limit switch (9) operable by the delivery piston (6) controls the opening movement while a delay element connected therewith controls the closing movement of the slide gate (13).
2. Melting device and applicator according to claim 1, characterized in that the delivery piston (6) can be subjected to an increased working pressure for applying the hot melt adhesive, and to a reduced off-load pressure during the inoperative period of the applicator (2).
3. Melting device and applicator according to claim 1 or 2, characterized in that the slide gate (13) is provided with a cutting edge (15) at its end facing the inlet opening (12).
4. Melting device and applicator according to claim 3, characterized in that another cutting edge (16) is arranged on the wall (11) of the melting chamber (4) opposite the cutting edge (15) of the slide gate (13).
5. Melting device and applicator according to any of claims 1 to 4, characterized in that the supply vessel (17) is detachably connected with the melting chamber (4).
6. Melting device and applicator according to claim 5, characterized in that a slide gate (27) is provided on and connected with the outlet end of the supply vessel (17).
7. Melting device and applicator according to claim 5 or 6, characterized in that the supply vessel (17) is protected by a bar (19') which coacts with a circuit breaker (25) in such a manner that the actuating unit (14) cannot be operated as long as the bar (19') is in its unlocked position.
8. Melting device and applicator according to any of claims 2 to 7, characterized in that a timing relay connected to the first limit switch is arranged for causing a conventional blocking element arranged on the infeed side of the edge banding machine to move into a blocking position in which no further workpieces can be fed in when no granulated hot melt adhesive (18) is present in the melting chamber (4).
EP82101725A 1981-03-12 1982-03-05 Melting and depositing apparatus for a hot melt glue Expired EP0061040B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82101725T ATE14682T1 (en) 1981-03-12 1982-03-05 MELTING AND APPLICATION DEVICE FOR HOT ADHESIVE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3109369 1981-03-12
DE3109369A DE3109369C2 (en) 1981-03-12 1981-03-12 Melting and application device for hot melt adhesive

Publications (3)

Publication Number Publication Date
EP0061040A2 EP0061040A2 (en) 1982-09-29
EP0061040A3 EP0061040A3 (en) 1983-08-03
EP0061040B1 true EP0061040B1 (en) 1985-08-07

Family

ID=6126974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82101725A Expired EP0061040B1 (en) 1981-03-12 1982-03-05 Melting and depositing apparatus for a hot melt glue

Country Status (7)

Country Link
US (1) US4441450A (en)
EP (1) EP0061040B1 (en)
JP (1) JPS57162664A (en)
AT (1) ATE14682T1 (en)
AU (1) AU554654B2 (en)
DE (1) DE3109369C2 (en)
ES (1) ES8303126A1 (en)

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Also Published As

Publication number Publication date
AU8135882A (en) 1982-09-16
US4441450A (en) 1984-04-10
DE3109369A1 (en) 1982-09-23
DE3109369C2 (en) 1984-01-12
ES510329A0 (en) 1983-02-01
ES8303126A1 (en) 1983-02-01
AU554654B2 (en) 1986-08-28
ATE14682T1 (en) 1985-08-15
EP0061040A3 (en) 1983-08-03
EP0061040A2 (en) 1982-09-29
JPS57162664A (en) 1982-10-06

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