EP0751245A2 - Heating apparatus for heating a moving yarn - Google Patents

Heating apparatus for heating a moving yarn Download PDF

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Publication number
EP0751245A2
EP0751245A2 EP96109591A EP96109591A EP0751245A2 EP 0751245 A2 EP0751245 A2 EP 0751245A2 EP 96109591 A EP96109591 A EP 96109591A EP 96109591 A EP96109591 A EP 96109591A EP 0751245 A2 EP0751245 A2 EP 0751245A2
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EP
European Patent Office
Prior art keywords
thread
heating
heating device
guides
groove
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.)
Granted
Application number
EP96109591A
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German (de)
French (fr)
Other versions
EP0751245B1 (en
EP0751245A3 (en
Inventor
Uwe Baader
Johannes Bruske
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oerlikon Barmag AG
Original Assignee
Barmag AG
Barmag Barmer Maschinenfabrik AG
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Publication date
Application filed by Barmag AG, Barmag Barmer Maschinenfabrik AG filed Critical Barmag AG
Publication of EP0751245A2 publication Critical patent/EP0751245A2/en
Publication of EP0751245A3 publication Critical patent/EP0751245A3/en
Application granted granted Critical
Publication of EP0751245B1 publication Critical patent/EP0751245B1/en
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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass

Definitions

  • the invention relates to a heating device for heating a running thread, according to the preamble of claim 1.
  • Such heating devices are known. Such a heating device is described in EP 0 412 429 B1, in which the thread is guided along a heating element by means of several thread guides, in the general thread running direction, the thread guides being arranged in a groove of a heating element, so that the groove facing heating surfaces of the heater and heating the thread.
  • the thread guides of the known heating device lie on a curved line which is at a distance from the heating surfaces. This curved line is designed as a zigzag line, which is spanned in a surface that is at a distance from the heating surfaces over the entire length of the heating device.
  • the zigzag line increases the length of the thread related to the length of the heating device, which is exposed to heating in the heating device, but at the same time increases the friction of the thread on the thread guides. Increasing the friction on the thread guides adversely affects the thread tension. On the one hand, the thread should remain guided for as long as possible in the heating device in the sense of effective heating, but with low friction, on the other hand, this requirement is opposed to increased thread running speeds.
  • the heating device for heating the running thread is designed as an elongated heating element which has heating surfaces in the form of a groove, in which a plurality of thread guides are arranged one behind the other in the thread running direction.
  • the thread guides lie on a line with zigzag-shaped changes in direction, which is spanned in a surface that is at a distance from the heating surfaces over the entire length of the heating device.
  • a thread is deflected on the thread guides so that the thread path corresponds to the line.
  • the number of changes in direction of the line and thus also of the thread run is smaller than the number of thread guides.
  • the zigzag-shaped lines on which the thread guides are arranged are interrupted by at least one straight section. This results in a lower thread wrap on the thread guide and thus a reduced friction.
  • the thread guides are arranged in such a way that the line undergoes a change of direction before or after at least two thread guides arranged directly one behind the other.
  • two thread guides lying next to each other in the thread running direction are arranged on a straight line essentially parallel to the heating surfaces and so that the thread has a spacing which varies in pairs and alternates from the groove when it is swept the thread guide has.
  • the section of the thread running line formed by the two thread guides lying next to one another is eccentrically facing a heating surface with respect to the center of the groove of the heating device, so that the thread alternately faces the one heating surface of the groove alternately on the two thread guides lying next to one another, so that after leaving it Section into a section of the thread running line which also runs essentially parallel to the heating surface of the groove of the heating device opposite this heating surface.
  • the thread guides are designed as slide-in plates or disks which have thread guide slots which extend into the groove of the heating device and which likewise extend parallel to the heating surfaces.
  • the thread guides are designed as rod-like elements which are arranged on the heating surfaces and around which the thread runs.
  • the rod-like elements are now arranged in such a way that the thread always runs past the thread guide on the side facing away from the heating surfaces, but the thread run is also off-center in the thread guides lying next to one another.
  • the rod-like elements preferably have a circular cross-section, with other rounded cross-sections such as e.g. oval cross-sections, slightly flattened cross-sections u. are possible.
  • the thread guides are bead-like as attached to the heating surfaces of the heating device Elements trained.
  • the bead-like elements preferably have an essentially semi-cylindrical cross section.
  • the bead-like elements can preferably also have the shape of a sine wave in their cross section.
  • the thread guides are preferably arranged at an equal distance from one another, so that the thread running curve sections formed by the two thread guides lying next to one another and arranged essentially parallel to the heating surfaces each have the same length in order to ensure as uniform a heating of the thread as possible as it passes through the heating device .
  • three thread guides are arranged off-center of the groove in such a way that only after every third of the three thread guides there is a change in the sign of the direction gradient of the thread running curve, the thread running curve preferably having a substantially sinusoidal course.
  • Fig. 1 shows a cross section through a radiator in a basic arrangement.
  • the heating device 1 which has a U-shaped groove 6, is constructed such that heating elements arranged in the U-shaped block emit their heating energy via the groove base 15 and the heating surfaces 5.
  • Thread guides 2 are provided in the groove on disk-shaped carriers 10. These thread guides 2 are incorporated as thread guide slots in the carrier 10, the slots extending essentially parallel to the heating surfaces 5 and in the direction of the groove base 15. Depending on the thread running speed and the available heating energy and thread material, the thread guide slots can be arranged closer to the heating surfaces or further away from the heating surfaces. According to the invention, however, these thread guide slots are always arranged in the area between the center line of the groove 6 and the heating surfaces 5.
  • the disk-shaped carriers 10 which are essentially the same distance apart in the running direction of the thread, have a funnel-shaped side on their side facing away from the heating device 1 Inlet to facilitate the insertion of the thread into the thread guide slot.
  • the substantially evenly arranged thread guides 2 are shown with the respective thread guide slots through which the thread 7 runs.
  • the first two thread guides shown on the left in Fig. 2 have thread guide slots which are at the same distance from the heating surface 5, so that there is an essentially parallel thread path, i.e. parallel to the heating surface 5.
  • the thread guide slots are rounded in accordance with the deflection of the thread when it enters the first thread guide and when it exits the second thread guide.
  • the thread runs through the slots of the next two thread guides, the thread guide slots are arranged so that the thread 7, which is essentially parallel to the heating surface 5, is closer to the heating surface 5, which is the heating surface facing the thread 7 between the first and the first second thread guide is opposite.
  • this thread guide according to the invention has the advantage that there is less thread wrap on the thread guide and thus a reduced friction.
  • This advantage is achieved in that the thread e.g. is deflected at every second or third thread guide by the amount of coverage of the thread guide with respect to the median plane of the groove.
  • the contact zone between the thread and the thread guide in a double arrangement which is reduced by approx. 50%, has a positive influence on the thread path, particularly in the case of small overlaps and narrow tolerances.
  • the length of the heater i.e. the length of the thread which is set in the heating device for the purpose of heating is determined in accordance with the process parameters, in particular in accordance with the type of thread. Thread thickness, thread speed, temperature of the radiator, dimensioning of the heating device, etc. are relevant parameters for this. Take e.g. assuming that the total length should be 1 meter, this results in a length of 500 mm for each individual radiator, of which several can be arranged one behind the other in the overall system.
  • Fig. 3 shows a heating device in front view in the form of a vertical section.
  • the heating device 1 designed as a U-shaped rail delimits a groove with the heating surfaces 5 and the groove base in its interior 15.
  • a resistance heater 14 is arranged in the actual heating device 1, via which the energy supply into the interior of the groove is realized.
  • a unit is provided in the longitudinal groove 6, which is preferably fastened by clips.
  • This assembly consists of a band-shaped carrier 10 and laterally attached thread guides 3.
  • the thread guides are offset from one another on both sides, in pairs at equal intervals.
  • the carrier 10 is deformed by clamping the assembly so that it is in contact with two opposite pairs of thread guides, so that the assembly fits under the elastic clamping forces in the groove.
  • the thread guides 3 are held in the groove 6 by caps 17. These caps 17 are C-shaped and take the upper longitudinal edge of one flank of the groove 6 and engage even in small longitudinal grooves, which are introduced on both sides of the upper longitudinal edges in the side walls of the groove, ie the
  • FIG. 4 shows a heating device with carriers and thread guides in a top view of the groove 6 of the heating device 1.
  • the carrier 10 with the thread guides 9 is inserted in the elongated, U-shaped groove.
  • the carrier 10 is forced into a line arrangement which corresponds to that shown in FIG. 4. That is, the carrier touches two adjacent thread guides, which are arranged alternately in pairs in the thread running direction on opposite sides of the heating surfaces 5 of the groove 6.
  • the individual thread guides 9 are supported on the side walls, ie the heating surfaces of the groove.
  • it is important that the band which forms the carrier 10 is elastic and remains elastic even when the heating is provided to more than 400 ° C.
  • the heating device 1 is in turn designed as an elongated, U-shaped body which has in its interior resistance heaters 14 which are introduced into corresponding bores in the heating device 1 and which serve to heat the groove 6 formed in the U-shaped heating element.
  • Two metal strips 13 are inserted into the groove 6.
  • the metal strips 13 are supported on the opposite side walls, i.e. Heating surfaces 5, the longitudinal groove.
  • the elevations designed as beads serve as thread guides and are in turn facing opposite side walls in pairs.
  • the two metal strips 13 are connected to one another via webs 8 in the area of the groove base 15, so that on the one hand the position of the metal strips 13 is fixed to one another and on the other hand the thread is prevented from touching the wall of the groove 6, i.e. touches the groove bottom 15.
  • the webs 8 are therefore preferably arranged at a distance from the groove base 15.
  • the beads are designed so that on the open side of the U-shaped groove 6 a V-shaped incision is made through the bevel 18, which also facilitates the insertion of the thread.
  • Fig. 6 shows a further embodiment according to the invention in the form of a plan view of the groove cross section.
  • Bead-shaped elevations which are arranged in pairs in the thread running direction one behind the other on opposite sides of the groove 6, serve as the thread guide 11, so that the thread extends essentially parallel to the heating surfaces 5 between the two bead-shaped elevations, the height of the beads being designed so that that they extend over the central plane of the groove 6.
  • webs 12 are provided for holding the thread guides 11 on the respective heating surfaces 5.

Abstract

A heater for a running yarn (7) has heating surfaces in the form of a groove with several yarn guides (2) to give zig- zag changes of direction to the yarn and space it from the heating surface along the entire length of the heater. The number of changes of direction is smaller than the number of yarn guides. Pref. the yarn direction only changes between pairs of successive yarn guides, i.e. sections of threadline parallel to the heater alternate with inclined sections. The yarn guides can be formed by slots, by circular rods or by half-round swaged beads. The distance between pairs of guides for a parallel section is pref. less than half the width of the heater groove. The threadline can be in the approximate shape of a sine curve with the slope changing sign after a constant number of yarn guides. The yarn guides can be spaced equidistantly.

Description

Die Erfindung betrifft eine Heizeinrichtung zum Erwärmen eines laufenden Fadens, gemaß Oberbegriff von Anspruch 1.The invention relates to a heating device for heating a running thread, according to the preamble of claim 1.

Derartige Heizeinrichtungen sind bekannt. In der EP 0 412 429 B1 ist eine derartige Heizeinrichtung beschrieben, bei welcher der Faden mittels mehrerer Fadenführer längs eines Heizkörpers geführt wird, und zwar in der allgemeinen Faden Fadenlaufrichtung, wobei die Fadenführer in einer Nut eines Heizkörpers angeordnet sind, so daß die der Nut zugewandten Heizflächen des Heizers und Erwärmung des Fadens beitragen. Die Fadenführer der bekannten Heizeinrichtung liegen auf einer gekrümmten Linie, welche einen Abstand zu den Heizflächen aufweist. Diese gekrümmte Linie ist als eine Zickzack-Linie ausgeführt, welche in einer Fläche aufgespannt ist, die über die gesamte Länge der Heizeinrichtung einen Abstand zu den Heizflächen aufweist. Durch die Zickzack-Linie wird zwar die auf die Länge der Heizeinrichtung bezogene Fadenlänge, welche in der Heizeinrichtung einer Aufheizung ausgesetzt ist, vergrößert, es erhöht sich jedoch gleichzeitig die Reibung des Fadens an den Fadenführern. Eine Erhöhung der Reibung an den Fadenführern wirkt sich nachteilig auf die Fadenspannung aus. Einerseits soll der Faden im Sinne einer effektiven Aufheizung möglichst lang und dennoch reibungsarm geführt in der Heizeinrichtung geführt verbleiben, andererseits steht diese Forderung erhöhten Fadenlaufgeschwindigkeiten entgegen.Such heating devices are known. Such a heating device is described in EP 0 412 429 B1, in which the thread is guided along a heating element by means of several thread guides, in the general thread running direction, the thread guides being arranged in a groove of a heating element, so that the groove facing heating surfaces of the heater and heating the thread. The thread guides of the known heating device lie on a curved line which is at a distance from the heating surfaces. This curved line is designed as a zigzag line, which is spanned in a surface that is at a distance from the heating surfaces over the entire length of the heating device. The zigzag line increases the length of the thread related to the length of the heating device, which is exposed to heating in the heating device, but at the same time increases the friction of the thread on the thread guides. Increasing the friction on the thread guides adversely affects the thread tension. On the one hand, the thread should remain guided for as long as possible in the heating device in the sense of effective heating, but with low friction, on the other hand, this requirement is opposed to increased thread running speeds.

Es ist deshalb die Aufgabe der vorliegenden Erfindung, eine Heizeinrichtung zum Erwärmen eines laufenden Fadens zu schaffen, bei welcher die Reibung des Fadens an den Fadenführern bei gleichbleibend hoher Fadenlaufgeschwindigkeit und im wesentlichen unverändertem Wärmeübergang reduziert wird.It is therefore the object of the present invention to provide a heating device for heating a running thread, in which the friction of the thread on the thread guides is reduced while the thread running speed remains constant and the heat transfer is essentially unchanged.

Diese Aufgabe wird mit einer Heizeinrichtung mit den Merkmalen gemäß Anspruch 1 gelöst.This object is achieved with a heating device with the features according to claim 1.

Danach ist die Heizeinrichtung zum Erwärmen des laufenden Fadens als langgestreckter Heizkörper ausgebildet, welcher Heizflächen in Form einer Nut aufweist, in der mehrere Fadenführer in Fadenlaufrichtung hintereinander angebracht sind. Die Fadenführer liegen auf einer Linie mit zickzack-förmigen Richtungsänderungen, die in einer Fläche aufgespannt ist, die über die ganze Länge der Heizeinrichtung einen Abstand zu den Heizflächen hat. An den Fadenführern erfährt ein Faden jeweils eine Ablenkung, so daß der Fadenlauf der Linie entspricht. Erfindungsgemäß ist die Anzahl der Richtungsänderungen der Linie und somit auch des Fadenlaufs kleiner als die Anzahl der Fadenführer. Mit anderen Worten, die zickzack-förmigen Linien, auf der die Fadenführer angeordnet sind, sind durch wenigstens einen geraden Abschnitt unterbrochen. Hierdurch wird eine geringere Fadenumschlingung am Fadenführer und damit eine reduzierte Reibung erzielt.Thereafter, the heating device for heating the running thread is designed as an elongated heating element which has heating surfaces in the form of a groove, in which a plurality of thread guides are arranged one behind the other in the thread running direction. The thread guides lie on a line with zigzag-shaped changes in direction, which is spanned in a surface that is at a distance from the heating surfaces over the entire length of the heating device. A thread is deflected on the thread guides so that the thread path corresponds to the line. According to the invention, the number of changes in direction of the line and thus also of the thread run is smaller than the number of thread guides. In other words, the zigzag-shaped lines on which the thread guides are arranged are interrupted by at least one straight section. This results in a lower thread wrap on the thread guide and thus a reduced friction.

Nach einer bevorzugten Ausbildung sind die Fadenführer so angeordnet, daß die Linie jeweils vor oder nach mindestens zwei unmittelbar hintereinander angeordneten Fadenführern eine Richtungsänderung erfährt.According to a preferred embodiment, the thread guides are arranged in such a way that the line undergoes a change of direction before or after at least two thread guides arranged directly one behind the other.

Bei einem bevorzugten Ausführungsbeispiel sind jeweils zwei in Fadenlaufrichtung nebeneinanderliegende Fadenführer auf einer Geraden im wesentlichen parallel zu den Heizflächen und so angeordnet, daß der Faden einen paarweise alternierend variierenden Abstand zu der Nut beim Überstreichen der Fadenführer aufweist. Der durch die beiden nebeneinanderliegenden Fadenführer gebildete Abschnitt der Fadenlauflinie ist jeweils, bezogen auf die Mitte der Nut der Heizeinrichtung, außermittig einer Heizfläche zugewandt, so daß abwechselnd der Faden alternierend an den beiden nebeneinanderliegenden Fadenführern der einen Heizfläche der Nut zugewandt ist, um nach Verlassen dieses Abschnittes in einen ebenfalls wesentlichen parallel zu der dieser Heizfläche gegenüberliegenden Heizfläche der Nut der Heizeinrichtung verlaufenden Abschnitt der Fadenlauflinie überzugehen. In der Nut der Heizeinrichtung sind nun mehrere dieser Fadenführerpaare angeordnet. Eine solche Doppelanordnung von jeweils zwei Fadenführern alternierend jeweils an einer der Heizflächen bedeutet, daß der Richtungsgradient nach jedem zweiten Fadenführer sein Vorzeichen wechselt.In a preferred embodiment, two thread guides lying next to each other in the thread running direction are arranged on a straight line essentially parallel to the heating surfaces and so that the thread has a spacing which varies in pairs and alternates from the groove when it is swept the thread guide has. The section of the thread running line formed by the two thread guides lying next to one another is eccentrically facing a heating surface with respect to the center of the groove of the heating device, so that the thread alternately faces the one heating surface of the groove alternately on the two thread guides lying next to one another, so that after leaving it Section into a section of the thread running line which also runs essentially parallel to the heating surface of the groove of the heating device opposite this heating surface. Several of these thread guide pairs are now arranged in the groove of the heating device. Such a double arrangement of two thread guides alternately on each of the heating surfaces means that the directional gradient changes its sign after every second thread guide.

Bei einem bevorzugten Ausführungsbeispiel sind die Fadenführer als Einschubplatten bzw. -scheiben ausgebildet, welche sich in die Nut der Heizeinrichtung erstreckende Fadenführungsschlitze aufweisen, die sich ebenfalls parallel zu den Heizflächen erstrecken.In a preferred embodiment, the thread guides are designed as slide-in plates or disks which have thread guide slots which extend into the groove of the heating device and which likewise extend parallel to the heating surfaces.

Bei einem weiteren bevorzugten Ausführungsbeispiel sind die Fadenführer als stabartige Elemente ausgebildet, welche an den Heizflächen angeordnet sind und um die der Faden läuft. Die stabartigen Elemente sind nun so angeordnet, daß der Faden stets an der den Heizflächen abgewandten Seite der Fadenführer vorbeiläuft, jedoch der Fadenlauf bei den nebeneinanderliegenden Fadenführern ebenfalls außermittig ist. Vorzugsweise weisen die stabartigen Elemente einen kreisförmigen Querschnitt auf, wobei andere abgerundete Querschnitte wie z.B. ovale Querschnitte, leicht abgeflachte Querschnitte u. ä. möglich sind.In a further preferred exemplary embodiment, the thread guides are designed as rod-like elements which are arranged on the heating surfaces and around which the thread runs. The rod-like elements are now arranged in such a way that the thread always runs past the thread guide on the side facing away from the heating surfaces, but the thread run is also off-center in the thread guides lying next to one another. The rod-like elements preferably have a circular cross-section, with other rounded cross-sections such as e.g. oval cross-sections, slightly flattened cross-sections u. are possible.

Bei noch einem weiteren bevorzugten Ausführungsbeispiel sind die Fadenführer als an den Heizflächen der Heizeinrichtung befestigte sickenartige Elemente ausgebildet. Vorzugsweise weisen die sickenartigen Elemente einen im wesentlichen halbzylindrischen Querschnitt auf. Vorzugsweise können die sickenartigen Elemente in ihrem Querschnitt auch die Form einer Sinuswelle aufweisen.In yet another preferred exemplary embodiment, the thread guides are bead-like as attached to the heating surfaces of the heating device Elements trained. The bead-like elements preferably have an essentially semi-cylindrical cross section. The bead-like elements can preferably also have the shape of a sine wave in their cross section.

Vorzugsweise sind die Fadenführer in einem gleichen Abstand zueinander angeordnet, so daß die von den jeweils nebeneinanderliegenden beiden Fadenführern gebildeten, im wesentlichen parallel zu den Heizflächen angeordneten Fadenlaufkurvenabschnitte jeweils die gleiche Länge aufweisen, um eine möglichst gleichmäßige Erwärmung des Fadens beim Durchlauf durch die Heizeinrichtung zu gewährleisten.The thread guides are preferably arranged at an equal distance from one another, so that the thread running curve sections formed by the two thread guides lying next to one another and arranged essentially parallel to the heating surfaces each have the same length in order to ensure as uniform a heating of the thread as possible as it passes through the heating device .

Bei noch einem weiteren bevorzugten Ausführungsbeispiel sind jeweils drei Fadenführer außermittig der Nut so angeordnet, daß nur nach jedem dritten der drei Fadenführer eine Vorzeichenänderung des Richtungsgradienten der Fadenlaufkurve auftritt, wobei die Fadenlaufkurve vorzugsweise im wesentlichen einen sinusförmigen Verlauf aufweist.In yet another preferred embodiment, three thread guides are arranged off-center of the groove in such a way that only after every third of the three thread guides there is a change in the sign of the direction gradient of the thread running curve, the thread running curve preferably having a substantially sinusoidal course.

Weitere Vorteile und Anwendungsmöglichkeiten der vorliegenden Erfindung werden nun anhand der beigefügten Zeichnungen nachfolgend detailliert erläutert.Further advantages and possible uses of the present invention will now be explained in detail below with reference to the accompanying drawings.

Es zeigen:

Fig. 1
einen Querschnitt durch einen Heizkörper gemäß der Erfindung;
Fig. 2
eine Draufsicht auf den Nutquerschnitt der Heizeinrichtung;
Fig. 3
eine Heizeinrichtung in Vorderansicht;
Fig. 4
eine Heizeinrichtung mit Trägern und Fadenführern in Draufsicht auf die Nut der Heizeinrichtung;
Fig. 5
einen Querschnitt durch eine Heizeinrichtung gemäß einem weiteren Ausführungsbeispiel der Erfindung; und
Fig. 6
eine Draufsicht auf den Nutquerschnitt einer Heizeinrichtung mit sickenförmig angeordneten Fadenführelementen.
Show it:
Fig. 1
a cross section through a radiator according to the invention;
Fig. 2
a plan view of the groove cross section of the heating device;
Fig. 3
a heater in front view;
Fig. 4
a heater with carriers and thread guides in plan view of the groove of the heater;
Fig. 5
a cross section through a heating device according to a further embodiment of the invention; and
Fig. 6
a plan view of the groove cross section of a heating device with bead-arranged thread guide elements.

Fig. 1 zeigt einen Querschnitt durch einen Heizkörper in prinzipieller Anordnung. Die Heizeinrichtung 1, welche eine U-förmig ausgebildete Nut 6 aufweist, ist so aufgebaut, daß in dem U-förmigen Block angeordnete Heizelemente ihre Heizenergie über den Nutgrund 15 sowie die Heizflächen 5 abgeben. In der Nut sind auf scheibenförmigen Trägern 10 vorgesehene Fadenführer 2 angeordnet. Diese Fadenführer 2 sind als Fadenführungsschlitze in die Träger 10 eingearbeitet, wobei sich die Schlitze im wesentlichen parallel zu den Heizflächen 5 und in Richtung auf den Nutgrund 15 erstrecken. Je nach Fadenlaufgeschwindigkeit und vorhandener Heizenergie sowie Fadenmaterial können die Fadenführungsschlitze näher an den Heizflächen oder entfernter von den Heizflächen angeordnet sein. Erfindungsgemäß sind diese Fadenführungsschlitze jedoch stets im Bereich zwischen Mittellinie der Nut 6 und Heizflächen 5 angeordnet. Da ein in den Fadenführungsschlitzen laufender, in Fig. 1 nicht dargestellter Faden an jedem Fadenführer eine Umlenkung erfährt, sind die Umlenkflächen über die Dicke des Trägers 10 abgerundet ausgeführt, um einen möglichst geringen Einfluß auf die Fadenspannung beim Einlaufen des Fadens in den Fadenführungsschlitz auszuüben. Die scheibenförmigen Träger 10, welche im wesentlichen in Laufrichtung des Fadens einen gleichen Abstand zueinander aufweisen, besitzen an ihrer der Heizeinrichtung 1 abgewandten Seite einen trichterförmigen Einlauf zum Erleichtern des Einführens des Fadens in den Fadenführungsschlitz.Fig. 1 shows a cross section through a radiator in a basic arrangement. The heating device 1, which has a U-shaped groove 6, is constructed such that heating elements arranged in the U-shaped block emit their heating energy via the groove base 15 and the heating surfaces 5. Thread guides 2 are provided in the groove on disk-shaped carriers 10. These thread guides 2 are incorporated as thread guide slots in the carrier 10, the slots extending essentially parallel to the heating surfaces 5 and in the direction of the groove base 15. Depending on the thread running speed and the available heating energy and thread material, the thread guide slots can be arranged closer to the heating surfaces or further away from the heating surfaces. According to the invention, however, these thread guide slots are always arranged in the area between the center line of the groove 6 and the heating surfaces 5. Since a thread running in the thread guide slots, not shown in FIG. 1, is deflected at each thread guide, the deflecting surfaces are rounded off over the thickness of the carrier 10 in order to exert as little influence as possible on the thread tension when the thread runs into the thread guide slot. The disk-shaped carriers 10, which are essentially the same distance apart in the running direction of the thread, have a funnel-shaped side on their side facing away from the heating device 1 Inlet to facilitate the insertion of the thread into the thread guide slot.

In Fig. 2 ist eine Draufsicht auf den Nutquerschnitt der Heizeinrichtung gezeigt. Aus Gründen der Übersichtlichkeit sind die Heizeinrichtung abschließende Abdeckungen nicht eingezeichnet. Die im wesentlichen gleichmäßig angeordneten Fadenführer 2 sind mit den jeweiligen Fadenführungsschlitzen dargestellt, durch welche der Faden 7 läuft. Die in Fig. 2 links dargestellten ersten beiden Fadenführer weisen Fadenführungsschlitze auf, die einen gleichen Abstand zur Heizfläche 5 aufweisen, so daß sich zwischen diesen beiden Fadenführern ein im wesentlichen paralleler Fadenlauf, d.h. parallel zu der Heizfläche 5, ergibt. Entsprechend der Ablenkung des Fadens beim Einlauf in den ersten Fadenführer und beim Auslauf aus dem zweiten Fadenführer sind die Fadenführungsschlitze abgerundet. Der Faden läuft durch die Schlitze der nächsten beiden Fadenführer, deren Fadenführungsschlitze so angeordnet sind, daß der im wesentlichen zu der Heizfläche 5 parallele Verlauf des Fadens 7 näher an der Heizfläche 5 angeordnet ist, welche der dem Faden 7 zugewandten Heizfläche zwischen dem ersten und dem zweiten Fadenführer entgegengesetzt ist.2 shows a top view of the groove cross section of the heating device. For the sake of clarity, covers covering the heating device are not shown. The substantially evenly arranged thread guides 2 are shown with the respective thread guide slots through which the thread 7 runs. The first two thread guides shown on the left in Fig. 2 have thread guide slots which are at the same distance from the heating surface 5, so that there is an essentially parallel thread path, i.e. parallel to the heating surface 5. The thread guide slots are rounded in accordance with the deflection of the thread when it enters the first thread guide and when it exits the second thread guide. The thread runs through the slots of the next two thread guides, the thread guide slots are arranged so that the thread 7, which is essentially parallel to the heating surface 5, is closer to the heating surface 5, which is the heating surface facing the thread 7 between the first and the first second thread guide is opposite.

Gegenüber einer im Stand der Technik bekannten Zickzack-Linie des Fadenlaufs bzw. der Fadenlaufkurve weist diese erfindungsgemäße Fadenführung den Vorteil auf, daß eine geringere Fadenumschlingung am Fadenführer und damit eine reduzierte Reibung vorhanden ist. Dieser Vorteil wird dadurch erreicht, daß der Faden z.B. an jedem zweiten oder dritten Fadenführer um den Betrag der Überdeckung der Fadenführer bzgl. der Mittelebene der Nut umgelenkt wird.Compared to a zigzag line of the thread path or the thread path curve known in the prior art, this thread guide according to the invention has the advantage that there is less thread wrap on the thread guide and thus a reduced friction. This advantage is achieved in that the thread e.g. is deflected at every second or third thread guide by the amount of coverage of the thread guide with respect to the median plane of the groove.

Durch die Tatsache, daß bei paarweiser Anordnung stets zwei benachbarte Fadenführer auf einer Geraden parallel zur Nut liegen, wird der im Stand der Technik bekannte zickzack-förmige Fadenverlauf jeweils durch gerade Teilstücke unterbrochen. Der Umschlingungswinkel am Fadenführer ist im Vergleich zu dem Umschlingungswinkel bei Ausführung des Standes der Technik nur halb so groß (bei Dreifachanordnung entsprechend 1/3 usw.). Die Überlappung der Fadenführer über die Mittelebene der Nut richtet sich nach den Verfahrensparametern bzw. Fadenmaterialien bzw. der installierten Heizleistung.The fact that in a pairwise arrangement there are always two adjacent thread guides on a straight line parallel to the groove, the in the stand known zigzag-shaped thread course interrupted by straight sections. The wrap angle on the thread guide is only half as large compared to the wrap angle in the prior art design (corresponding to 1/3 in the case of a triple arrangement). The overlap of the thread guides over the median plane of the groove depends on the process parameters or thread materials or the installed heating power.

Durch die um ca. 50 % reduzierte Kontaktzone zwischen Faden und Fadenführer bei Doppelanordnung ergibt sich insbesondere bei kleinen Überlappungen und engen Toleranzen ein positiver Einfluß auf den Fadenlauf. Die Länge der Heizeinrichtung, d.h. die Länge des Fadens, welche der Heizeinrichtung zum Zwecke des Aufheizens gesetzt ist, wird entsprechend den Prozeßparametern, insbesondere entsprechend der Fadenart bestimmt. Fadendicke, Fadengeschwindigkeit, Temperatur des Heizkörpers, Dimensionierung der Heizeinrichtung u.s.w. sind dafür relevante Parameter. Nimmt man z.B. an, daß die Gesamtlänge 1 Meter sein soll, so ergibt sich für jeden einzelnen Heizkörper, von denen mehrere hintereinander in der Gesamtanlage angeordnet sein können, eine Länge von 500 mm.The contact zone between the thread and the thread guide in a double arrangement, which is reduced by approx. 50%, has a positive influence on the thread path, particularly in the case of small overlaps and narrow tolerances. The length of the heater, i.e. the length of the thread which is set in the heating device for the purpose of heating is determined in accordance with the process parameters, in particular in accordance with the type of thread. Thread thickness, thread speed, temperature of the radiator, dimensioning of the heating device, etc. are relevant parameters for this. Take e.g. assuming that the total length should be 1 meter, this results in a length of 500 mm for each individual radiator, of which several can be arranged one behind the other in the overall system.

Es hat sich herausgestellt, daß auf dem in Fadenlaufrichtung durch die Anlage ersten Heizkörper bzw. der ersten Heizeinrichtung vier und auf der zweiten Heizeinrichtung fünf Fadenführer zweckmäßig sind. Bei einer derartigen Gestaltung liegt der Abstand der einzelnen Fadenführer im Bereich von ca. 125mm, wobei dieser Wert selbstverständlich prozeß- und materialparameterabhängig ist.It has been found that four thread guides are expedient on the first heating element or the first heating device in the thread running direction through the system and five on the second heating device. With such a design, the distance between the individual thread guides is in the range of approximately 125 mm, this value of course being dependent on the process and material parameters.

Fig. 3 zeigt eine Heizeinrichtung in Vorderansicht in Form eines senkrechten Schnittes. Die als U-förmige Schiene ausgebildete Heizeinrichtung 1 begrenzt in ihrem Innern eine Nut mit den Heizflächen 5 und dem Nutgrund 15. In der eigentlichen Heizeinrichtung 1 ist ein Widerstandsheizer 14 angeordnet, über welchen die Energiezufuhr in das Innere der Nut realisiert wird. In der Längsnut 6 ist eine Baueinheit vorgesehen, welche vorzugsweise durch Klammern befestigt ist. Diese Baueinheit besteht aus einem bandförmigen Träger 10 und seitlich daran angebrachten Fadenführern 3. Die Fadenführer sind beidseits zueinander versetzt, und zwar paarweise mit gleichen Abständen angeordnet. Der Träger 10 wird durch Einklemmen der Baueinheit so verformt, daß er mit jeweils zwei jeweils gegenüberliegenden aufeinanderfolgenden Paaren von Fadenführern in Berührung steht, so daß sich die Baueinheit unter den elastischen Klemmkräften in der Nut einpaßt. Die Fadenführer 3 werden durch Kappen 17 in der Nut 6 gehalten. Diese Kappen 17 sind C-förmig ausgebildet und ergreifen die obere Längskante jeweils einer Flanke der Nut 6 und greifen dabei selbst in kleine Längsnuten ein, die beidseits der oberen Längskanten in den Seitenwandungen der Nut, d.h. den Heizflächen 5 eingebracht sind.Fig. 3 shows a heating device in front view in the form of a vertical section. The heating device 1 designed as a U-shaped rail delimits a groove with the heating surfaces 5 and the groove base in its interior 15. A resistance heater 14 is arranged in the actual heating device 1, via which the energy supply into the interior of the groove is realized. A unit is provided in the longitudinal groove 6, which is preferably fastened by clips. This assembly consists of a band-shaped carrier 10 and laterally attached thread guides 3. The thread guides are offset from one another on both sides, in pairs at equal intervals. The carrier 10 is deformed by clamping the assembly so that it is in contact with two opposite pairs of thread guides, so that the assembly fits under the elastic clamping forces in the groove. The thread guides 3 are held in the groove 6 by caps 17. These caps 17 are C-shaped and take the upper longitudinal edge of one flank of the groove 6 and engage even in small longitudinal grooves, which are introduced on both sides of the upper longitudinal edges in the side walls of the groove, ie the heating surfaces 5.

Fig. 4 stellt eine Heizeinrichtung mit Trägern und Fadenführern in Draufsicht auf die Nut 6 der Heizeinrichtung 1 dar. In der langgestreckten, U-förmigen Nut ist der Träger 10 mit den Fadenführern 9 eingesetzt. Beim Einsetzen des Trägers 10 mit den Fadenführern 9, welche als stabförmige Elemente mit kreisquerschnitt ausgebildet sind, wird der Träger 10 in eine Linienführung gezwungen, die der in Fig. 4 dargestellten entspricht. D.h., der Träger berührt jeweils zwei benachbarte Fadenführer, welche in Fadenlaufrichtung nacheinander abwechselnd paarweise auf gegenüberliegenden Seiten der Heizflächen 5 der Nut 6 angeordnet sind. Die einzelnen Fadenführer 9 stützen sich an den Seitenwandungen, d.h. den Heizflächen der Nut, ab. Bezüglich der Materialauswahl ist es wichtig, daß das Band, welches den Träger 10 bildet, elastisch ist, und auch bei der vorgesehenen Erwärmung auf mehr als 400°C elastisch bleibt.4 shows a heating device with carriers and thread guides in a top view of the groove 6 of the heating device 1. The carrier 10 with the thread guides 9 is inserted in the elongated, U-shaped groove. When inserting the carrier 10 with the thread guides 9, which are designed as rod-shaped elements with a circular cross section, the carrier 10 is forced into a line arrangement which corresponds to that shown in FIG. 4. That is, the carrier touches two adjacent thread guides, which are arranged alternately in pairs in the thread running direction on opposite sides of the heating surfaces 5 of the groove 6. The individual thread guides 9 are supported on the side walls, ie the heating surfaces of the groove. With regard to the choice of material, it is important that the band which forms the carrier 10 is elastic and remains elastic even when the heating is provided to more than 400 ° C.

In Fig. 5 ist ein weiteres Ausführungsbeispiel einer Heizeinrichtung gemäß der Erfindung als Querschnitt durch die Heizeinrichtung dargestellt. Die Heizeinrichtung 1 ist wiederum als langgestreckter, U-förmiger Körper ausgebildet, welcher in seinem Innern Widerstandsheizer 14 aufweist, welche in entsprechenden Bohrungen der Heizeinrichtung 1 eingebracht sind und welche der Erwärmung des in dem U-förmigen Heizkörpers ausgebildeten Nut 6 dienen. In der Nut 6 sind zwei Metallbänder 13 eingeschoben. Hierbei stützen sich die Metallbänder 13 an den gegenüberliegenden Seitenwandungen, d.h. Heizflächen 5, der Längsnut ab. Die als Sicken ausgebildeten Erhebungen dienen als Fadenführer und sind wiederum paarweise gegenüberliegenden Seitenwandungen zugewandt. Die beiden Metallbänder 13 sind über Stege 8 im Bereich des Nutgrundes 15 miteinander verbunden, so daß zum einen die Position der Metallbänder 13 zueinander fixiert ist und zum anderen verhindert wird, daß der Faden die Wand der Nut 6, d.h. den Nutgrund 15 berührt. Die Stege 8 sind deshalb vorzugsweise mit einem Abstand zum Nutgrund 15 angeordnet. Die Sicken sind so ausgebildet, daß auf der offenen Seite der U-förmigen Nut 6 ein V-förmiger Einschnitt durch die Anschrägung 18 entsteht, welcher ebenfalls das Einlegen des Fadens erleichtert.5 shows a further exemplary embodiment of a heating device according to the invention as a cross section through the heating device. The heating device 1 is in turn designed as an elongated, U-shaped body which has in its interior resistance heaters 14 which are introduced into corresponding bores in the heating device 1 and which serve to heat the groove 6 formed in the U-shaped heating element. Two metal strips 13 are inserted into the groove 6. Here, the metal strips 13 are supported on the opposite side walls, i.e. Heating surfaces 5, the longitudinal groove. The elevations designed as beads serve as thread guides and are in turn facing opposite side walls in pairs. The two metal strips 13 are connected to one another via webs 8 in the area of the groove base 15, so that on the one hand the position of the metal strips 13 is fixed to one another and on the other hand the thread is prevented from touching the wall of the groove 6, i.e. touches the groove bottom 15. The webs 8 are therefore preferably arranged at a distance from the groove base 15. The beads are designed so that on the open side of the U-shaped groove 6 a V-shaped incision is made through the bevel 18, which also facilitates the insertion of the thread.

Fig. 6 zeigt ein weiteres Ausführungsbeispiel gemäß der Erfindung in Form einer Draufsicht auf den Nutquerschnitt. Als Fadenführer 11 dienen sickenförmige Erhebungen, welche jeweils paarweise in Fadenlaufrichtung hintereinander an gegenüberliegenden Seiten der Nut 6 angeordnet sind, so daß sich zwischen den beiden sickenförmigen Erhebungen der Faden im wesentlichen parallel zu den Heizflächen 5 erstreckt, wobei die Höhe der Sicken so ausgebildet ist, daß sie über die Mittelebene der Nut 6 reichen. Im Bereich des Nutgrundes 15 sind Stege 12 zum Halten der Fadenführer 11 an den jeweiligen Heizflächen 5 vorgesehen.Fig. 6 shows a further embodiment according to the invention in the form of a plan view of the groove cross section. Bead-shaped elevations, which are arranged in pairs in the thread running direction one behind the other on opposite sides of the groove 6, serve as the thread guide 11, so that the thread extends essentially parallel to the heating surfaces 5 between the two bead-shaped elevations, the height of the beads being designed so that that they extend over the central plane of the groove 6. In the area of the groove base 15, webs 12 are provided for holding the thread guides 11 on the respective heating surfaces 5.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

11
HeizeinrichtungHeating device
22nd
FadenführerThread guide
33rd
FadenführerThread guide
44th
FadenführerThread guide
55
HeizflächenHeating surfaces
66
NutGroove
77
Fadenthread
88th
Stegweb
99
FadenführerThread guide
1010th
Trägercarrier
1111
FadenführerThread guide
1212th
Stegweb
1313
MetallbandMetal strap
1414
WiderstandsheizerResistance heater
1515
NutgrundGroove base
1616
UmlenkflächenDeflection surfaces
1717th
KappenCaps
1818th
AnschrägungBevel

Claims (11)

Heizeinrichtung zum Erwärmen eines laufenden Fadens (1), deren langgestreckter Heizkörper (2) Heizflächen (5) in Form einer Nut (6) aufweist, in der mehrere Fadenführer (3, 4) angebracht sind, die auf einer Linie mit zickzack-förmigen Richtungsänderungen liegen, die in einer Fläche aufgespannt ist, die über die ganze Länge der Heizeinrichtung einen Abstand zu den Heizflächen (5) hat,
dadurch gekennzeichnet, daß
die Anzahl der Richtungsänderungen Kleiner ist als die Anzahl der Fadenführer (3, 4).Heating device for heating a running thread (1), the elongated heating element (2) of which has heating surfaces (5) in the form of a groove (6) in which a plurality of thread guides (3, 4) are attached, which are in line with zigzag-shaped changes in direction lying in a surface that is at a distance from the heating surfaces (5) over the entire length of the heating device,
characterized in that
the number of changes in direction is less than the number of thread guides (3, 4). Heizeinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Linie jeweils vor oder nach mindestens zwei unmittelbar hintereinander angeordneten Fadenführern (3, 4) eine Richtungsänderung erfährt.Heating device according to claim 1, characterized in that the line undergoes a change in direction before or after at least two thread guides (3, 4) arranged directly one behind the other. Heizeinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß jeweils zwei in Fadenlaufrichtung nebeneinanderliegende Fadenführer (3, 4) auf einer Geraden im wesentlichen parallel zu den Heizflächen (5) und so angeordnet sind, daß der Faden (1) einen paarweise alternierend variierenden Abstand zu der Nut beim Überstreichen der Fadenführer (3, 4) aufweist.Heating device according to claim 1 or 2, characterized in that in each case two thread guides (3, 4) lying next to one another in the thread running direction are arranged on a straight line essentially parallel to the heating surfaces (5) and in such a way that the thread (1) has a spacing which varies in pairs to the groove when scanning the thread guides (3, 4). Heizeinrichtung nach Anspruch 1, 2 oder 3, bei der die Fadenführer (3, 4) in der Nut (6) befestigt sind und sich parallel zu den Heizflächen (5) erstreckende Fadenführungsschlitze (8) aufweisen.Heating device according to claim 1, 2 or 3, in which the thread guides (3, 4) are fastened in the groove (6) and have thread guide slots (8) extending parallel to the heating surfaces (5). Heizeinrichtung nach Anspruch 1, 2 oder 3, bei der die Fadenführer (3, 4) als an den Heizflächen (5) befestigte stabartige Elemente (9, 10) ausgebildet sind.Heating device according to claim 1, 2 or 3, in which the thread guides (3, 4) are designed as rod-like elements (9, 10) attached to the heating surfaces (5). Heizeinrichtung nach Anspruch 5, bei der die stabartigen Elemente (9, 10) einen kreisförmigen Querschnitt aufweisen.Heating device according to claim 5, wherein the rod-like elements (9, 10) have a circular cross section. Heizeinrichtung nach Anspruch 1, 2 oder 3, bei der die Fadenführer (3, 4) als an den Heizflächen (5) befestigte sickenartige Elemente (11, 12) ausgebildet sind.Heating device according to claim 1, 2 or 3, in which the thread guides (3, 4) are designed as bead-like elements (11, 12) attached to the heating surfaces (5). Heizeinrichtung nach Anspruch 7, bei der die sickenartigen Elemente (11, 12) einen im wesentlichen halbzylindrischen Querschnitt aufweisen.Heating device according to claim 7, wherein the bead-like elements (11, 12) have a substantially semi-cylindrical cross section. Heizeinrichtung nach einem der Ansprüche 1 bis 8, bei der der parallele Abstand des von den paarweise auf einer Geraden liegenden Fadenführern (3, 4) geführten Fadens (1) stets kleiner als die halbe Nutbreite ist.Heating device according to one of Claims 1 to 8, in which the parallel distance of the thread (1) guided by the thread guides (3, 4) lying in pairs on a straight line is always less than half the groove width. Heizeinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Fadenführer so angeordnet sind, daß die Fadenlaufkurve im wesentlichen sinusförmig verläuft, und so angeordnet sind, daß jeweils nach einer konstanten Anzahl von in Fadenlaufrichtung nacheinander angeordneten Fadenführern eine Vorzeichenänderung des Richtungsgradienten der Fadenlaufkurve auftritt.Heating device according to claim 1, characterized in that the thread guides are arranged in such a way that the thread running curve is essentially sinusoidal, and are arranged in such a way that after a constant number of thread guides arranged one after the other in the thread running direction there is a change in the sign of the directional gradient of the thread running curve. Heizeinrichtung nach einem der Ansprüche 1 bis 10, bei der die Fadenführer äquidistant angeordnet sind.Heating device according to one of claims 1 to 10, wherein the thread guides are arranged equidistantly.
EP96109591A 1995-06-27 1996-06-14 Heating apparatus for heating a moving yarn Expired - Lifetime EP0751245B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19523356 1995-06-27
DE19523356 1995-06-27

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EP (1) EP0751245B1 (en)
KR (1) KR100396157B1 (en)
CN (1) CN1066219C (en)
DE (1) DE59609899D1 (en)
TW (1) TW381129B (en)

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Also Published As

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KR970001636A (en) 1997-01-24
EP0751245B1 (en) 2002-11-27
CN1066219C (en) 2001-05-23
TW381129B (en) 2000-02-01
US5797256A (en) 1998-08-25
CN1144854A (en) 1997-03-12
KR100396157B1 (en) 2003-11-28
EP0751245A3 (en) 1999-07-21
DE59609899D1 (en) 2003-01-09

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