EP0534132B1 - Process for the weft insertion in an air-jet loom - Google Patents

Process for the weft insertion in an air-jet loom Download PDF

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Publication number
EP0534132B1
EP0534132B1 EP92114199A EP92114199A EP0534132B1 EP 0534132 B1 EP0534132 B1 EP 0534132B1 EP 92114199 A EP92114199 A EP 92114199A EP 92114199 A EP92114199 A EP 92114199A EP 0534132 B1 EP0534132 B1 EP 0534132B1
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Prior art keywords
thread
weft
weft thread
transfer
program
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EP92114199A
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German (de)
French (fr)
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EP0534132A1 (en
Inventor
Adnan Dr.-Ing. Wahhoud
Dieter Dipl.-Ing. Teufel
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Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026Air supply systems
    • D03D47/3033Controlling the air supply
    • D03D47/304Controlling of the air supply to the auxiliary nozzles
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026Air supply systems
    • D03D47/3033Controlling the air supply
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34Handling the weft between bulk storage and weft-inserting means

Definitions

  • the invention relates to a method for weft insertion on an air jet loom according to the preamble of patent claim 1.
  • the transport of the weft thread through the entry channel in the reed and here in particular the entry time or speed required for the weft entry is dependent on several factors. For example, there are differences in the air effectiveness of the thread from one and the same thread supply and fluctuations in the winding density of the thread supply, i.e. the weft threads of the upper thread layers of a thread supply generally have a surface structure that is less favorable for air attack than the middle and end positions of the thread supply , to be corrected by a corresponding procedure for weft insertion in the weaving machine.
  • the individual relay nozzles or groups of relay nozzles would in fact be used to set up a new traveling field according to the program and to maintain it with a comparatively higher pressure, that is to say a higher energy requirement, and to allow it to act on the weft thread.
  • the entry parameters for the weft thread once specified, would have to be changed, which would not have an impact on the productivity of the weaving machine. In addition, this measure would cause an undesirably high consumption of feed fluid, but this can be ruled out.
  • the invention is therefore based on the object, in addition to the program-oriented traveling field already formed by the relay nozzles for transporting the weft thread through the weft thread entry channel, with the disadvantageous influences which act on the weft thread entry during the transition of the weft thread from one thread supply to the next eliminate.
  • the decrease in the bobbin diameter D to d or the weft thread consumption (SFV) is plotted on the abscissa and the filament flight time (FFZ) and energy requirement (EB) are plotted on the ordinate.
  • FIG. 1 shows the course of the flight time of the weft thread as a function of the diameter of the thread supply with constant energy input EB for the weft thread insertion into the shed of a weaving machine.
  • a regulation of the weft thread entry is not provided here. It is clear from this that with decreasing diameter of the thread supply from D to d the flight time FFZ of the weft thread through the shed also decreases. It is also shown that the energy requirement EB in air, an important parameter for the weft insertion Air jet weaving machines, regardless of the thread supply quantity, is constant. The thread flight time FFZ and the energy input for the weft thread insertion are therefore not interdependent.
  • the energy requirement EB used to guarantee a weft flight time FFZ that is to be kept constant from weft insertion to weft insertion across the width of the shed is dependent on the current quantity of the thread supply present on the respective thread spool 1A, 2A, 3A etc. That is to say, the need for transport medium, which is required via the individual relay nozzles or relay nozzle groups, in order to transport the weft thread to be inserted into the shed, increases substantially continuously as the thread supply on the thread spool 1A, 2A etc. decreases to the thread supply "zero" the coils 1B, 2B and so on.
  • a bobbin overflow sensor 7 is integrated between the decreasing thread supply 1B and the filled thread supply 2A. This sensor 7 detects the transition of the weft thread from the one thread supply 1B to the other thread supply 2A to the control unit of the air jet weaving machine, not shown here.
  • the traveling field according to the program which is formed by successively actuating the relay nozzles or groups of relay nozzles distributed over the weaving width, that is, before, during or immediately after the thread supply 1B has run out, by switching from the target energy requirement 4.2 to the target Energy requirement 4.1, that is, by comparatively increasing the pressure of the medium acting on the weft thread, superimposes the operating interval 8 of a transition hiking field. As shown in FIG.
  • Fig. 2 can be seen - as a result of the direct transition from empty stock to full stock - in the transition phase from thread supply to thread supply to extended weft insertion times, to loose threads in the fabric or even to the loom being switched off. With the formation of the transition hiking field, these adverse consequences are completely eliminated.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Schußfadeneintrag auf einer Luftdüsenwebmaschine nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for weft insertion on an air jet loom according to the preamble of patent claim 1.

Beim Betreiben von Luftdüsenwebmaschinen ist allgemein bekannt, daß der Transport des Schußfadens durch den Eintragkanal im Webblatt und hier insbesondere die für den Schußeintrag benötigte Eintragszeit bzw. notwendige Geschwindigkeit von mehreren Faktoren abhängig ist.
So sind beispielsweise Unterschiede in der Luftwirksamkeit des Fadens von ein und demselben Fadenvorrat und Schwankungen in der Aufwickeldichte des Fadenvorrates, d.h. die Schußfäden der oberen Fadenlagen eines Fadenvorrates weisen in aller Regel eine für den Luftangriff ungünstigere Oberflächenstruktur auf, als die Mittel- und Endlagen des Fadenvorrates, durch einen entsprechenden Verfahrensablauf beim Schußfadeneintrag in der Webmaschine zu beheben.
Um diese Unzulänglichkeiten ausgleichen zu können und die fest in der Programmsteuerung vorgegebene Eintragszeit oder Geschwindigkeit des Schußfadens innerhalb eines Webzyklus zu gewährleisten, ist bekannt, die Eintragszeit oder die Geschwindigkeit des Schußfadens im Sinne einer Erhöhung oder Verringerung der Luft-Impulsdauer durch die Hauptdüse einer Luftdüsenwebmaschine zu beeinflussen.
Bekannt ist aus der FR-PS 2 508 941 ein Verfahren zum Weben auf einer Düsenwebmaschine, wonach die Schußfäden von Vorratspulen abgezogen, abgemessen und von einer mit einem Transportfluidum gespeisten Hauptdüse in das Webfach eingetragen werden und wobei zur Vermeidung negativer Einflüsse aus dem Übergang des Schußfadens von einer Vorratsspule zur anderen auf die Dauer des Schußeintrags der Speisedruck der Hauptdüse zeitweilig geändert wird.
Dies unter Einbeziehung der Stafettendüsen oder durch die Stafettendüsen selbst zu bewerkstelligen ist nicht bekannt.
When operating air jet looms, it is generally known that the transport of the weft thread through the entry channel in the reed and here in particular the entry time or speed required for the weft entry is dependent on several factors.
For example, there are differences in the air effectiveness of the thread from one and the same thread supply and fluctuations in the winding density of the thread supply, i.e. the weft threads of the upper thread layers of a thread supply generally have a surface structure that is less favorable for air attack than the middle and end positions of the thread supply , to be corrected by a corresponding procedure for weft insertion in the weaving machine.
In order to be able to compensate for these shortcomings and to ensure the entry time or the speed of the weft that is fixed in the program control within a weaving cycle, it is known that the entry time or the speed of the weft in the sense of an increase or decrease in the air pulse duration through the main nozzle of an air jet weaving machine influence.
From FR-PS 2 508 941 a method for weaving on a jet loom is known, according to which the weft threads are drawn off from supply bobbins, measured and inserted into the shed from a main nozzle fed with a transport fluid, and to avoid negative influences from the transition of the weft thread the feed pressure of the main nozzle is temporarily changed from one supply spool to the other for the duration of the weft insertion.
It is not known to do this by including the relay nozzles or by the relay nozzles themselves.

Gemäß der DE-OS 38 18 766 ist bekannt, die Ansteuerung der Stafettendüsen einer Luftdüsenwebmaschine so weiterzubilden, daß in aufeinanderfolgenden Arbeitsgängen unterschiedliche Garnqualitäten verarbeitet werden können. Dazu werden die Stafettendüsen gruppenweise angesteuert und die Dauer der Impulslänge der Ansteuerung in Abhängigkeit von der Luftwirksamkeit des jeweils zu verarbeitenden Garns geregelt.
Einflüsse, die beim Übergang des Schußfadens von einem Fadenvorrat auf einen anderen Vorrat negativ auf den Webprozeß wirken, können mit der bekannten Lösung nicht beseitigt werden.
According to DE-OS 38 18 766 it is known to further develop the control of the relay nozzles of an air jet loom so that different yarn qualities can be processed in successive operations. To do this, the Relay nozzles controlled in groups and the duration of the pulse length of the control regulated depending on the air effectiveness of the yarn to be processed.
Influences which have a negative effect on the weaving process when the weft thread is transferred from one thread supply to another supply cannot be eliminated with the known solution.

Bei der Verarbeitung von Fäden ein und derselben Qualität, die jedoch von zwei verschiedenen miteinander verbundenen Fadenvorräten abgezogen werden, treten diese Unzulänglichkeiten in gleicher Weise auf. Hinzu kommen weitere Einflüsse, nämlich solche, die entstehen, wenn der erste Fadenvorrat, von welchem der Schußfaden gerade abgezogen wurde zu Ende geht und auf den nächsten Fadenvorrat übergegangen wird. Hier ist das Fadenende des auslaufenden Vorrats mit dem Fadenanfang des z.B. vollen Vorrats verbunden.
Obwohl, wie bereits ausgeführt, es sich hierbei um die gleiche Schußfadenqualität handelt, sind die Einflüsse, die aus dem Fadenübergang resultieren, nicht ohne weiteres über die bekannte Stafettendüsen-Steuerung zu beheben.
Mit den einzelnen Stafettendüsen oder Gruppen von Stafettendüsen wäre nämlich ein neues programmgemäßes Wanderfeld aufzubauen und mit einem vergleichsweise höheren Druck, also höherem Energiebedarf aufrecht zu erhalten und auf den Schußfaden wirken zu lassen. Die einmal vorgegebenen Eintragsparameter für den Schußfaden müßten also verändert werden, was nicht ohne Einfluß auf die Produktivität der Webmaschine bliebe. Darüber hinaus würde diese Maßnahme einen unerwünscht hohen Verbrauch an Eintragsfluidum verursachen, was aber auszuschließen ist.
When processing threads of the same quality, but which are subtracted from two different interconnected thread stores, these shortcomings occur in the same way. In addition there are other influences, namely those which arise when the first thread supply from which the weft thread has just been drawn comes to an end and the next thread supply is transferred. Here the thread end of the outgoing supply is connected to the thread start of the full supply, for example.
Although, as already stated, this is the same weft thread quality, the influences resulting from the thread transition cannot be easily remedied using the known relay nozzle control.
The individual relay nozzles or groups of relay nozzles would in fact be used to set up a new traveling field according to the program and to maintain it with a comparatively higher pressure, that is to say a higher energy requirement, and to allow it to act on the weft thread. The entry parameters for the weft thread, once specified, would have to be changed, which would not have an impact on the productivity of the weaving machine. In addition, this measure would cause an undesirably high consumption of feed fluid, but this can be ruled out.

Der Erfindung liegt daher die Aufgabe zugrunde, zusätzlich zu den bereits von den Stafettendüsen zum Transport des Schußfadens durch den Schußfadeneintragskanal gebildeten programmgemäßen Wanderfeld ein Übergangswanderfeld auszubilden, mit dem nachteilige Einflüsse, die beim Übergang des Schußfadens von einem Fadenvorrat zum nächstfolgenden auf den Schußfadeneintrag wirken, zu eliminieren.The invention is therefore based on the object, in addition to the program-oriented traveling field already formed by the relay nozzles for transporting the weft thread through the weft thread entry channel, with the disadvantageous influences which act on the weft thread entry during the transition of the weft thread from one thread supply to the next eliminate.

Die Aufgabe wird erfindungsgemäß dadurch gelöst,

  • daß während oder unmittelbar nach dem Übergang des Schußfadens von dem einen Fadenvorrat auf den nächstfolgenden dem programmgemäß ausgebildeten Wanderfeld zeitweilig ein Übergangswanderfeld überlagert wird,
  • daß das Übergangswanderfeld solange aufrechterhalten bleibt, bis eine Anfangsmenge von Schußfäden vom nächstfolgenden Fadenvorrat abgezogen ist oder bis die Fadenflugzeit ihren Soll-Wert erreicht hat
    und
  • daß nachfolgend zu dem programmgemäß ausgebildeten Wanderfeld zurückgekehrt wird.
According to the invention, the object is achieved by
  • that a transition hiking field is temporarily superimposed during or immediately after the transition of the weft thread from the one thread supply to the next following one, which is designed according to the program,
  • that the transition hiking field is maintained until an initial quantity of weft threads has been subtracted from the next thread supply or until the thread flight time has reached its desired value
    and
  • that is subsequently returned to the hiking field trained according to the program.

Es hat sich gezeigt, daß die nachteiligen Einflüsse auf den Schußfadeneintrag während des Übergangs des Schußfadens von dem leeren zu dem vollen Fadenvorrat im wesentlichen nur durch eine zeitweilige Verlängerung der Impulsdauer der das programmgemäße Wanderfeld ausbildenden Gruppen von Stafettendüsen erreichbar ist. Überraschenderweise hat sich auch gezeigt, daß die Verlängerung der Impulsdauer aber bereits nach wenigen, mittels des Übergangswanderfeldes eingetragenen Schußfäden aufgehoben werden kann. Damit wird gewährleistet, daß ein für den Aufbau und die Aufrechterhaltung des Übergangswanderfeldes veranschlagter höherer Luftverbrauch nicht zu verzeichnen ist.It has been shown that the disadvantageous influences on the weft thread insertion during the transition of the weft thread from the empty to the full thread supply can essentially only be achieved by temporarily increasing the pulse duration of the groups of relay nozzles which form the traveling field according to the program. Surprisingly, it has also been shown that the extension of the pulse duration can be canceled after only a few weft threads entered by means of the transition hiking field. This ensures that a higher air consumption that is estimated for the establishment and maintenance of the transition hiking field is not recorded.

Weitere, die erfindungsgemäße Lösung vorteilhaft ausgestaltende Merkmale, ergeben sich aus den Unteransprüchen.Further features which advantageously design the solution according to the invention result from the subclaims.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispieles näher erläutert.

Figur 1
zeigt die Abhängigkeit der Fadenflugzeit (FFZ) und des Energiebedarfs (EB) vom Durchmesser der Fadenspule ohne Schußeintragsregelung,
Figur 2
die Abhängigkeit der Fadenflugzeit (FFZ) und des Energiebedarfs (EB) vom Durchmesser der Fadenspule mit Schußeintragsregelung,
Fig. 3
die Abhänigkeit der Fadenflugzeit (FFZ) und des Energiebedarfs (EB) vom Durchmesser der Fadenspule unter Verwendung eines Spulenüberlaufsensors und mit Schußeintragsregelung.
The invention is explained in more detail below using an exemplary embodiment.
Figure 1
shows the dependence of the thread flight time (FFZ) and the energy requirement (EB) on the diameter of the thread spool without weft insertion control,
Figure 2
the dependence of the thread flight time (FFZ) and the energy requirement (EB) on the diameter of the thread spool with weft insertion control,
Fig. 3
the dependence of the thread flight time (FFZ) and the energy requirement (EB) on the diameter of the thread spool using a spool overflow sensor and with weft insertion control.

In den Figuren 1 bis 3 wird anhand der Diagramme der Einfluß der Spulendurchmesser-Verringerung an einer Luftdüsenwebmaschine, d.h. der zur Durchmesser-Verringerung führende Schußfadenverbrauch auf die wichtigen Parameter, wie Fadenflugzeit (Zeit des Schußfadens, die er vom Fadenstart auf der Schußfadeneintragsseite bis zur Fadenankunft auf der Schußfadenankunftseite der Webmaschine benötigt) und Energieverbrauch (Menge des Fluidums je Zeiteinheit für den Schußfadeneintrag in das Webfach) dargestellt.
Bei diesen Darstellungen wird zur Verdeutlichung der Vorteilswirkung der Erfindung noch zwischen einem Schußfadeneintrag ohne und einem Schußfadeneintrag mit Schußeintragsregelung unterschieden.
In Figures 1 to 3, the influence of the bobbin diameter reduction on an air jet loom, i.e. the weft thread consumption leading to the diameter reduction, on the important parameters, such as thread flight time (time of the weft thread, which it takes from the thread start on the weft thread insertion side to the thread arrival) is shown on the basis of the diagrams on the weft arrival side of the weaving machine) and energy consumption (amount of fluid per unit time for the weft insertion into the shed).
In order to clarify the advantageous effect of the invention, a distinction is made in these representations between a weft insertion without and a weft insertion with weft insertion regulation.

Auf der Abszisse der Diagramme ist die Abnahme des Spulendurchmessers D zu d oder des Schußfadenverbrauchs (SFV) und auf der Ordinate sind Fadenflugzeit (FFZ) und Energiebedarf (EB) aufgetragen.The decrease in the bobbin diameter D to d or the weft thread consumption (SFV) is plotted on the abscissa and the filament flight time (FFZ) and energy requirement (EB) are plotted on the ordinate.

In Figur 1 ist der Verlauf der Flugzeit des Schußfadens in Abhängigkeit vom Durchmmesser des Fadenvorrates bei konstantem Energieeinsatz EB für den Schußfadeneintrag in das Webfach einer Webmaschine gezeigt. Hierbei ist eine Regelung des Schußfadeneintrages nicht vorgesehen. Daraus wird deutlich, daß bei abnehmenden Durchmesser des Fadenvorrats von D nach d auch die Flugzeit FFZ des Schußfadens durch das Webfach abnimmt.
Ferner ist gezeigt, daß der Energiebedarf EB an Luft, ein wichtiger Parameter für den Schußfadeneintrag bei Luftdüsenwebmaschinen, unabhängig von der Fadenvorratsmenge, also konstant ist. Die Fadenflugzeit FFZ und der Energieeinsatz für den Schußfadeneintrag stehen hier also nicht in gegenseitiger Abhängigkeit. Dies sind gravierende Nachteile, weil zum einen unterschiedliche Fadenflugzeiten sich negativ auf die Leistung der Webmaschine auswirken und weil zum anderen der gleiche Energiebedarf, wie er für den Schußfadenabzug von einem vollen Fadenvorrat erforderlich ist, bei einem auslaufenden Fadenvorrat ebenfalls in Ansatz gebracht wird. Das heißt, ein durchgängig konstanter Energiebedarf wird nicht benötigt.
FIG. 1 shows the course of the flight time of the weft thread as a function of the diameter of the thread supply with constant energy input EB for the weft thread insertion into the shed of a weaving machine. A regulation of the weft thread entry is not provided here. It is clear from this that with decreasing diameter of the thread supply from D to d the flight time FFZ of the weft thread through the shed also decreases.
It is also shown that the energy requirement EB in air, an important parameter for the weft insertion Air jet weaving machines, regardless of the thread supply quantity, is constant. The thread flight time FFZ and the energy input for the weft thread insertion are therefore not interdependent. These are serious disadvantages because, on the one hand, different thread flight times have a negative impact on the performance of the weaving machine and, on the other hand, the same energy requirement as is required for the weft thread withdrawal from a full thread supply is also taken into account when the thread supply runs out. This means that a consistently constant energy requirement is not required.

Ausgehend von den vorgenannten Sachverhalten ist der Fachmann bestrebt, auf die Schußeintragsgeschwindigkeit und damit auf die Schußfadenflugzeit FFZ im Sinne einer Konstanthaltung Einfluß zu nehmen. Dazu war der über die nicht dargestellten Stafettendüsen zum Zwecke des Schußfadentransports durch das Webfach erforderliche Energiebedarf EB an die sich ändernden Bedingungen am Fadenvorrat 1A anzupassen.
Diese Anpassung erfolgte mittels einer an sich bekannten Schußeintragsregelung, deren Ablauf anhand der Fig. 2 gezeigt ist.
Hiernach ist ein Soll-Wert 5 für die Fadenflugzeit FFZ des Schußfadens durch das Webfach festgelegt. Der für die Gewährleistung einer von Schußeintrag zu Schußeintrag über die Breite des Webfaches konstant zu haltenden Fadenflugzeit FFZ eingesetzte Energiebedarf EB steht dabei in Abhängigkeit zu der momentanen Menge des auf der jeweiligen Fadenspule 1A, 2A, 3A usw. vorhandenen Fadenvorrates. Das heißt, der Bedarf an Transportmedium, der über die einzelnen Stafettendüsen oder Stafettendüsengruppen erforderlich ist, um den in das Webfach einzutragenden Schußfaden zu transportieren, nimmt bei abnehmenden Garnvorrat auf der Fadenspule 1A, 2A usw. im wesentlichen kontinuierlich bis zum Fadenvorrat "Null" auf den Spulen 1B, 2B usw. ebenfalls ab.
Bezogen auf die Zeitdauer der Ansteuerung der Stafettendüsen oder Gruppen von Stafettendüsen in der Webmaschine bedeutet dies, daß dadurch die Zeitdauer der Ansteuerung der den Stafettendüsen vorgeschalteten Ventile und damit die Blasdauer der Stafettendüsen reduziert ist.
Beim Übergang des Schußfadens von einem leerlaufenden Fadenvorrat 1B zu einem gefüllten Fadenvorrat 2A ist aufgrund der Bedingungen, wie sie zum Zeitpunkt des Fadenüberganges vorliegen, ein Ansteigen der Fadenflugzeit über den Soll-Wert 5 auf einen Ist-Wert 6 je Schußfadeneintrag zu verzeichnen. Der Anstieg der Fadenflugzeit FFZ auf einen über dem Soll-Wert 5 liegenden Wert wird in Fig. 2 gezeigt.
Da der durch die Steuerung vorgegebene Energiebedarf EB (Soll-Wert 4.1), wie er beim Start eines von einem gefüllten Fadenvorrat abzuziehenden Schußfadens auf selbigen wirkt und beim Fadenübergang nicht überschritten werden kann, kommt es zwangsläufig in diesem Zeitintervall zu einer Verlängerung der Fadenflugzeit Δ FFZ₁. Dies führt zu lockeren Fäden in dem zu fertigenden Gewebe und damit zu minderwertiger Webware.
Die erfindungsgemäße Lösung stellt nun auch diesen Mangel ab.
On the basis of the above-mentioned facts, the person skilled in the art strives to influence the weft insertion speed and thus the weft flight time FFZ in the sense of keeping it constant. For this purpose, the energy requirement EB required for the weft thread transport through the shed via the relay nozzles, not shown, had to be adapted to the changing conditions on the thread supply 1A.
This adjustment was carried out by means of a weft insertion control known per se, the sequence of which is shown in FIG. 2.
According to this, a target value 5 for the thread flight time FFZ of the weft thread is determined by the shed. The energy requirement EB used to guarantee a weft flight time FFZ that is to be kept constant from weft insertion to weft insertion across the width of the shed is dependent on the current quantity of the thread supply present on the respective thread spool 1A, 2A, 3A etc. That is to say, the need for transport medium, which is required via the individual relay nozzles or relay nozzle groups, in order to transport the weft thread to be inserted into the shed, increases substantially continuously as the thread supply on the thread spool 1A, 2A etc. decreases to the thread supply "zero" the coils 1B, 2B and so on.
Relative to the duration of the activation of the relay nozzles or groups of relay nozzles in the weaving machine this in that the duration of the activation of the valves upstream of the relay nozzles and thus the blowing duration of the relay nozzles is reduced.
During the transition of the weft thread from an empty thread supply 1B to a filled thread supply 2A, an increase in the thread flight time above the target value 5 to an actual value 6 per weft thread entry can be recorded due to the conditions as they exist at the time of the thread transition. The increase in the filament flight time FFZ to a value above the target value 5 is shown in FIG. 2.
Since the energy requirement specified by the control EB (target value 4.1), as it acts on the start of a weft thread to be withdrawn from a filled thread supply and cannot be exceeded during the thread transition, there is an inevitable extension of the thread flight time Δ FFZ 1 in this time interval . This leads to loose threads in the fabric to be manufactured and thus to inferior woven goods.
The solution according to the invention now also remedies this defect.

In Fig. 3 ist zwischen dem abnehmenden Fadenvorrat 1B und dem gefüllten Fadenvorrat 2A ein Spulenüberlaufsensor 7 eingebunden. Dieser Sensor 7 dedektiert den Übergang des Schußfadens von dem einen Fadenvorrat 1B zum anderen Fadenvorrat 2A an die hier nicht dargestellte Steuereinheit der Luftdüsenwebmaschine.
Daraufhin wird dem programmgemäßen Wanderfeld, welches durch aufeinanderfolgendes Ansteuern der über die Webbreite verteilt angeordneten Stafettendüsen oder Gruppen von Stafettendüsen ausgebildet wird, also noch vor, während oder unmittelbar nach dem Auslaufen des Fadenvorrats 1B, durch Umschalten von dem Soll-Energiebedarf 4.2 auf den Soll-Energiebedarf 4.1, also durch vergleichsweise Druckerhöhung des auf den Schußfaden wirkenden Mediums, das Betriebsintervall 8 eines Übergangswanderfeldes überlagert.
Dies führt dazu, wie Fig. 3 zeigt, daß die Schußfadenflugzeit der Schußfäden des auslaufenden Vorrats 1B, 2B zeitweilig gegenüber der programmgemäß vorgegebenen Fadenflugzeit FFZ (Soll-Wert 5) unterschritten wird. Der Schußfaden wird also zunächst im Betriebsintervall 8, um den Zeitbetrag FFZ - Δ FFZ₂ schneller durch das Webfach getragen. Nachdem eine Anfangsmenge von Schußfäden vom Fadenvorrat 2A, 3A abgezogen ist oder bis die Fadenflugzeit ihren Soll-Wert 5 wieder erreicht hat, wird zu dem programmgemäß ausgebildeten Wanderfeld zurückgekehrt.
In FIG. 3, a bobbin overflow sensor 7 is integrated between the decreasing thread supply 1B and the filled thread supply 2A. This sensor 7 detects the transition of the weft thread from the one thread supply 1B to the other thread supply 2A to the control unit of the air jet weaving machine, not shown here.
Thereupon, the traveling field according to the program, which is formed by successively actuating the relay nozzles or groups of relay nozzles distributed over the weaving width, that is, before, during or immediately after the thread supply 1B has run out, by switching from the target energy requirement 4.2 to the target Energy requirement 4.1, that is, by comparatively increasing the pressure of the medium acting on the weft thread, superimposes the operating interval 8 of a transition hiking field.
As shown in FIG. 3, this leads to the fact that the weft flight time of the weft threads of the expiring supply 1B, 2B temporarily compared to the yarn flight time FFZ predetermined according to the program (Target value 5) is undershot. The weft thread is therefore first carried in the operating interval 8 by the amount of time FFZ - Δ FFZ₂ faster through the shed. After an initial amount of weft threads has been withdrawn from the thread supply 2A, 3A or until the thread flight time has reached its target value 5 again, the program returns to the traveling field designed according to the program.

Mit diesen erfindungsgemäßen Schritten wird erreicht, daß es nicht, wie aus dem Diagramm gem. Fig. 2 zu erkennen - als Folge des direkten Übergangs von leerem Vorrat zu vollem Vorrat - in der Übergangsphase von Fadenvorrat zu Fadenvorrat zu verlängerten Schußeintragszeiten, zu lockeren Fäden in dem Gewebe oder gar zur Abstellung der Webmaschine kommt. Mit der Ausbildung des Übergangswanderfeldes werden diese nachteiligen Folgen vollkommen ausgeschaltet.With these steps according to the invention it is achieved that it does not, as shown in the diagram. Fig. 2 can be seen - as a result of the direct transition from empty stock to full stock - in the transition phase from thread supply to thread supply to extended weft insertion times, to loose threads in the fabric or even to the loom being switched off. With the formation of the transition hiking field, these adverse consequences are completely eliminated.

ZEICHNUNGS-LEGENDEDRAWING LEGEND

1A1A
Spule/Fadenvorrat vollBobbin / thread supply full
1B1B
Spule/Fadenvorrat auslaufendExpiring bobbin / thread supply
2A2A
Spule/Fadenvorrat vollBobbin / thread supply full
2B2 B
Spule/Fadenvorrat auslaufendExpiring bobbin / thread supply
3A3A
Spule/Fadenvorrat vollBobbin / thread supply full
44th
Energiebedarf - Soll-WertEnergy requirement - target value
55
Fadenflugzeit - Soll-WertThread flight time - target value
66
Fadenflugzeit - Ist-WertThread flight time - actual value
77
SpulenüberlaufsensorCoil overflow sensor
88th
Betriebsintervall ÜbergangswanderfeldOperating interval transition hiking field
DD
Spulendurchmesser volle SpuleFull bobbin diameter
dd
Spulendurchmesser auslaufende SpuleCoil diameter leaking coil
Δ FFZ₁Δ FFZ₁
Differenzbetrag FadenflugzeitDifferential amount of filament flight time
Δ FFZ₂Δ FFZ₂
Differenzbetrag FadenflugzeitDifferential amount of filament flight time

Claims (3)

  1. Process for weft thread input on an air jet loom with a plurality of thread spools forming a thread store, according to which, in order that a weft thread can be held in readiness in an uninterrupted manner, the weft thread end of one thread store is connected to the weft thread start of another thread store; according to which the transfer of the weft thread from the one thread store to the other is detected; according to which main and relaying jets are supplied with pressurised air according to a weft thread input program which was previously entered into a program carrier; and according to which the relaying jets, corresponding to the link existing between the program carrier and a control unit, build up a moving field by means of individual or group control during the input of the weft thread into the shed, characterised in that, during or immediately after the transfer of the weft thread from the one thread store to the next one, a transfer moving field is temporarily superimposed on the moving field according to the program; in that the transfer moving field is maintained until a start amount of weft threads is drawn off from the thread store or until the thread flight time has reached its intended value; and in that, subsequently, a return to the moving field which is formed according to the program is performed.
  2. Process according to claim 1, characterised in that the transfer of the thread is detected and the transfer moving field is activated using this detection.
  3. Process according to claim 1 and claim 2, characterised in that the thread is conducted through a detection zone in a manner known per se.
EP92114199A 1991-09-21 1992-08-20 Process for the weft insertion in an air-jet loom Expired - Lifetime EP0534132B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4131474 1991-09-21
DE4131474A DE4131474C2 (en) 1991-09-21 1991-09-21 Weft insertion method on an air jet loom

Publications (2)

Publication Number Publication Date
EP0534132A1 EP0534132A1 (en) 1993-03-31
EP0534132B1 true EP0534132B1 (en) 1996-05-29

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EP92114199A Expired - Lifetime EP0534132B1 (en) 1991-09-21 1992-08-20 Process for the weft insertion in an air-jet loom

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US (1) US5303746A (en)
EP (1) EP0534132B1 (en)
JP (1) JPH05195375A (en)
DE (1) DE4131474C2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19611320C2 (en) * 1996-03-22 1999-05-20 Dornier Gmbh Lindauer Method and device for pneumatically supporting the insertion and tensioning of a weft thread in weaving machines
DE10151780C1 (en) * 2001-10-19 2003-05-22 Dornier Gmbh Lindauer Method and device for influencing the thread braking force of a weft thread brake arranged between a yarn supply system and a thread store of a weaving machine
DE10224078A1 (en) * 2002-05-31 2003-12-18 Dornier Gmbh Lindauer Process for keeping a weft thread straight and weaving machine for carrying out the process
DE102005004064A1 (en) * 2005-01-21 2006-07-27 Picanol N.V. Device for introducing weft threads in an air-jet loom
US8220500B2 (en) * 2010-08-19 2012-07-17 Shun-Hsing Wang Power loom that can adjust the speed of the wefts automatically
DE102010044127B3 (en) * 2010-11-18 2011-12-29 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Gripper head for the entry of weft threads on a rapier loom and a rapier loom with such a gripper head

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8103184A (en) * 1981-07-02 1983-02-01 Rueti Te Strake Bv METHOD FOR WEAVING ON A WEAVING MACHINE USING A BLOWING NOZZLE FOR A FLOWING TRANSPORT MEDIUM.
NL8203808A (en) * 1982-09-30 1984-04-16 Rueti Te Strake Bv METHOD FOR TRANSPORTING A Weft Thread Through The Weaving Box Using A Flowing Medium At A Spoolless Weaving Machine, And Weaving Machine, Equipped For Application Of This Method
JPS5995179U (en) * 1982-12-14 1984-06-28 津田駒工業株式会社 Automatic weft insertion speed control device for air jet loom
DE3276123D1 (en) * 1982-12-24 1987-05-27 Sulzer Ag Device for operating an air jet loom
DE3818766A1 (en) * 1988-06-02 1989-12-07 Dornier Gmbh Lindauer NOZZLE CONTROL FOR AN AIR Loom
JPH0226957A (en) * 1988-07-12 1990-01-29 Nissan Motor Co Ltd Method for controlling picking of fluid jet type loom

Also Published As

Publication number Publication date
DE4131474A1 (en) 1993-03-25
DE4131474C2 (en) 1995-01-05
US5303746A (en) 1994-04-19
EP0534132A1 (en) 1993-03-31
JPH05195375A (en) 1993-08-03

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