EP0284766A1 - Process for cutting an inserted weft and cutting device - Google Patents

Process for cutting an inserted weft and cutting device Download PDF

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Publication number
EP0284766A1
EP0284766A1 EP88102500A EP88102500A EP0284766A1 EP 0284766 A1 EP0284766 A1 EP 0284766A1 EP 88102500 A EP88102500 A EP 88102500A EP 88102500 A EP88102500 A EP 88102500A EP 0284766 A1 EP0284766 A1 EP 0284766A1
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EP
European Patent Office
Prior art keywords
weft
separating device
thread
weft thread
cutting
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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
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EP88102500A
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German (de)
French (fr)
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EP0284766B1 (en
Inventor
Dirk Lewyllie
José Vangheluwe
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Picanol NV
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Picanol NV
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/70—Devices for cutting weft threads
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/125—Weft holding devices
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms 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
    • D03D47/30—Looms 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
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/308—Stretching or holding the weft

Definitions

  • the invention relates to a method for separating a inserted weft thread from a ready-made weft thread on a weaving machine by means of a separating device that becomes active during a weaving cycle, and a separating device.
  • the inserted weft thread is separated from the rest of the weft thread after a corresponding weft thread length has been introduced into the shed, i.e. of the weft thread ready for the next weft to be entered.
  • a separating device or the like via a cam mechanism. mechanical drive derived from the main drive of the loom. This separating device therefore works synchronously with the machine rhythm.
  • the mechanical coupling of the separating device to the main drive of the weaving machine means that the point in time at which the inserted weft thread is separated from the weft thread held ready is fixed in relation to the weaving cycle. It is known that the optimal time for severing depends on the type of weft used. If you want to work with different types of weft on the same weaving machine, you have to find and find a compromise between the optimal times for separating the individual types of weft. In this way, it is not possible to adjust the time of severing that is optimal for a specific weft thread.
  • the registered weft thread is not separated from the ready weft thread, in particular in certain methods for eliminating a weft thread defect (NL patent application 86 02 191).
  • the incorrectly inserted weft thread should not be separated from the weft thread so that it is still connected to the insertion device.
  • the introduction of the next weft thread, which is then still connected to the previous faulty weft thread means that the incorrectly inserted weft thread is taken along and removed.
  • the invention has for its object to design a method of the type mentioned so that on the one hand an optimization of the separation time for a weft type is possible, while on the other hand a separation can be prevented in a simple manner.
  • the separating device is actuated by means of its own, independent drive, which is controlled by means of a programmable control.
  • the separating device By using its own independent drive for the separating device, which is not mechanically coupled to the main drive of the weaving machine, the separating device can practically arbitrarily operated at any time or not operated. With the programmable control it is easily possible to determine the time of severing depending on the weaving parameters and data of the weft. It is just as easy to prevent disconnection.
  • a separating device for a weaving machine for separating an inserted weft thread from a ready-made weft thread during a weaving cycle in which the separating device is provided with its own, independent drive. With this separating device, the point in time of the detachment can be matched to the rest of the weaving cycle.
  • Fig. 1 the frame (1), the sheet (2), a main nozzle (3), a separator (4), a weft clamp (5) and a weft monitor (6) of an air-weaving machine are shown schematically.
  • the warp threads (7), the compartment (8), the weft feeder (9) and the finished goods (10) are visible. After each (successful) insertion of a weft, it is separated from the next weft held in the main blowing nozzle (3) by means of the separating device (4).
  • the scissor-like separating device (4) is actuated by a controllable drive (11) which in turn is controlled by a computer (12) which takes into account the weaving parameters (13) and the other weft data (14).
  • the drive (11) is preferably an electric drive, for example a stepper motor.
  • the weaving parameters (13) contain data relating to the weaving cycle, from which it can be determined at which point in time the separating device (4) is activated, as well as data relating to the weaving pattern and the possibly different types of thread, so that the computer (12) within a Weaving cycle can determine the optimal time for severing the weft.
  • the weaving parameters (13) can also contain data relating to the operating state of the weaving machine, either the state during normal operation or the state when the thread breaks, when starting, when the run is delayed, etc.
  • the weaving parameters (13) are set manually via programs or sensors entered the weaving machine.
  • the weft data (14) mainly consist of a signal (15) coming from the weft monitor (6) arranged at the end of the weaving thread and possibly one or more signals (16) that come from sensors that monitor the course of the weft Check the compartment.
  • a weft thread (17) is introduced in the usual manner, which is then, as shown in FIG. 1, struck with the sheet (2). He is pressed on the weft side between the jaws of the weft clamp (5), which is in its clamping position, so that the weft (17) is inserted into the closed weft clamp (5). The weft thread (17) also reaches the area of the separating device (4).
  • the computer (12) will activate the drive (11) with the help of the entered weaving parameters (13), whereby the separating device (4) removes the inserted weft thread (17) from the in the weft feeder (9) and the main blowing nozzle (3).
  • the separating device (4) can be prevented from cutting the thread in order to remove the faulty weft thread.
  • the combination separating device (4) and weft thread clamp (5) is shown schematically in Fig. 3. Both the separating device (4) and the weft thread clamp (5) have a fixed and a movable part, namely the parts (19 to 22).
  • the movable part (21) of the weft clamp (5) is constantly pressed against the fixed part (22) by elastic pressure elements, such as a compression spring (23).
  • the drive (11) is designed such that it can bring the separating device (4) into three positions: a closed position and two open positions.
  • the first open position is shown in Fig. 3.
  • the weft thread clamp (5) is still closed.
  • the second open position it has taken the movable part of the weft clamp (5) with it, as shown in Fig. 4, i.e. that the weft clamp (5) has been opened at the same time. In this way, a faulty weft thread (17) can be removed without hindrance by the weft thread clamp (5).
  • the weft clamp (5) can be pressed into the open position with the aid of the separating device (4) each time a weft thread (17) is brought into the compartment and before it is struck by the sheet (2) in the weft clamp (5) .
  • the weft thread (17) is simply brought between the parts (21 and 22).
  • the separating device (4) can then be brought into the separating position and thus the weft thread (17) is clamped between the jaws of the weft thread clamp (5), in order to then be separated from that held ready in the weft thread feeder (9) and the main blowing nozzle.
  • FIGS. 5 and 7 show in two views a practical embodiment of a separating device (4) which corresponds to the principle shown in FIGS. 3 and 4.
  • the movable part (19) (cutting edge) of the separating device (4) is a lever arm which is arranged on the shaft (24) of a stepping motor (25) in a rotationally fixed manner.
  • the stepper motor (25) is rotated due to a predetermined number of pulses for cutting by a certain angle of rotation range and then electrically turned back into the position shown in FIG. 5.
  • the stepper motor can be turned back by a larger angle of rotation than is required for the cutting on the basis of a special signal which is sent to the computer (12).
  • the movable part (21) of the weft thread clamp (5) is connected via a rigid connection (26) to a pivotable part (27) which can be pivoted about an axis (28).
  • the above-mentioned spring (23) engages on the pivotable part (27) and is adjusted with the aid of setting options (29) the spring pressure necessary for the clamping.
  • the axis (28) can be coaxial with the shaft (24).
  • the fixed parts (20 and 22) can also be made in one piece.
  • FIG. 7 shows the position of the separating device (4) according to FIGS. 5 and 6, which corresponds to the position in the schematic representation according to FIG. 4.
  • the upper edge (30) of the movable part (19) presses the connection (26) upwards, as a result of which the weft thread clamp (5) is opened.
  • the upper edge (30) carries an adjusting element (31) which is adjustable in height, i.e. perpendicular to the cutting edge, so that the opening of the weft thread clamp (5) can be regulated as a function of the opening angle of the separating device (4).

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

Abstract

Zum Abtrennen eines eingetragenen Schußfadens (17) von einem bereitgehaltenen Schußfaden wird in einer Webmaschine eine Trenneinrichtung (4) vorgesehen, die mittels eines eigenen, von dem Hauptmaschinenantrieb unabhängigen Antriebs (11) betätigt wird. Der Antrieb (11) ist mittels einer programmierbaren Steuerung (12) gesteuert.A separating device (4) is provided in a weaving machine in order to separate an inserted weft thread (17) from a ready-made weft thread, which is operated by means of its own drive (11) which is independent of the main machine drive. The drive (11) is controlled by means of a programmable control (12).

Description

Die Erfindung betrifft ein Verfahren zum Abtrennen eines einge­tragenen Schußfadens von einem bereitgehaltenen Schußfaden an einer Webmaschine mittels einer während eines Webzyklus tätig werdenden Trenneinrichtung und eine Trenneinrichtung.The invention relates to a method for separating a inserted weft thread from a ready-made weft thread on a weaving machine by means of a separating device that becomes active during a weaving cycle, and a separating device.

Bei Webmaschinen wird der eingetragene Schußfaden, nachdem eine entsprechende Schußfadenlänge in das Webfach eingeführt worden ist, mittels einer Trenneinrichtung von dem übrigen Schußfaden abgetrennt, d.h. von dem für den nächsten einzutragenden Schuß bereitgehaltenen Schußfaden. Es ist bekannt (US-A-4 134 434, US-A-4 531 555) für eine Trenneinrichtung einen über einen Nok­kenmechanismus o.dgl. von dem Hauptantrieb der Webmaschine ab­geleiteten mechanischen Antrieb vorzusehen. Diese Trenneinrich­tung arbeitet deshalb synchron zu dem Maschinenrhythmus.In the case of weaving machines, the inserted weft thread is separated from the rest of the weft thread after a corresponding weft thread length has been introduced into the shed, i.e. of the weft thread ready for the next weft to be entered. It is known (US-A-4 134 434, US-A-4 531 555) for a separating device or the like via a cam mechanism. mechanical drive derived from the main drive of the loom. This separating device therefore works synchronously with the machine rhythm.

Die mechanische Koppelung der Trenneinrichtung mit dem Hauptan­trieb der Webmaschine führt dazu, daß der Zeitpunkt des Abtren­nens des eingetragenen Schußfadens von dem bereitgehaltenen Schußfaden in bezug auf den Webzyklus unveränderlich festgelegt ist. Es ist bekannt, daß der optimale Zeitpunkt für das Abtren­nen von der verwendeten Art des Schußfadens abhängig ist. Wenn auf der gleichen Webmaschine mit verschiedenen Schußfadenarten gearbeitet werden soll, so muß ein Kompromiß zwischen den opti­malen Zeitpunkten des Abtrennens der einzelnen Schußfadenarten gesucht und gefunden werden. Eine Einstellung auf den für einen bestimmten Schußfaden optimalen Zeitpunkt des Abtrennens ist auf diese Weise nicht möglich.The mechanical coupling of the separating device to the main drive of the weaving machine means that the point in time at which the inserted weft thread is separated from the weft thread held ready is fixed in relation to the weaving cycle. It is known that the optimal time for severing depends on the type of weft used. If If you want to work with different types of weft on the same weaving machine, you have to find and find a compromise between the optimal times for separating the individual types of weft. In this way, it is not possible to adjust the time of severing that is optimal for a specific weft thread.

In manchen Fällen muß auch vorgesehen werden, daß der eingetra­gene Schußfaden nicht von dem bereitgehaltenen Schußfaden abge­trennt wird, insbesondere bei bestimmten Verfahren zum Beheben eines Schußfadenfehlers (NL-Patentanmeldung 86 02 191). Der fehlerhaft eingeführte Schußfaden soll nicht von dem bereitge­haltenen Schußfaden abgetrennt werden, so daß er noch mit der Einbringvorrichtung verbunden ist. Das Einbringen des nächsten Schußfadens, der dann noch mit dem vorhergehenden fehlerhaften Schußfaden verbunden ist, führt dazu, daß der fehlerhaft einge­tragene Schußfaden mitgenommen und entfernt wird. Um das Durch­trennen des (fehlerhaft) eingetragenen Schußfadens von dem be­reitgehaltenen Schußfaden in diesem Fall zu vermeiden, ist es bekannt, die Trenneinrichtung auf mechanische Weise zu blockie­ren, oder den Schußfaden mittels einer zusätzlichen Einrichtung aus dem Bereich der Trenneinrichtung herauszuhalten.In some cases, it must also be provided that the registered weft thread is not separated from the ready weft thread, in particular in certain methods for eliminating a weft thread defect (NL patent application 86 02 191). The incorrectly inserted weft thread should not be separated from the weft thread so that it is still connected to the insertion device. The introduction of the next weft thread, which is then still connected to the previous faulty weft thread, means that the incorrectly inserted weft thread is taken along and removed. In order to prevent the (incorrectly) inserted weft thread from being cut through in this case, it is known to mechanically block the separating device or to keep the weft thread out of the area of the separating device by means of an additional device.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art so zu gestalten, daß einerseits eine Optimierung des Trennzeitpunktes für eine Schußfadenart möglich ist, während andererseits in einfacher Weise ein Abtrennen un­terbunden werden kann.The invention has for its object to design a method of the type mentioned so that on the one hand an optimization of the separation time for a weft type is possible, while on the other hand a separation can be prevented in a simple manner.

Diese Aufgabe wird dadurch gelöst, daß die Trenneinrichtung mittels eines eigenen, unabhängigen Antriebs betätigt wird, der mittels einer programmierbaren Steuerung gesteuert wird.This object is achieved in that the separating device is actuated by means of its own, independent drive, which is controlled by means of a programmable control.

Durch die Verwendung eines eigenen, unabhängigen Antriebs für die Trenneinrichtung, der nicht mit dem Hauptantrieb der Webma­schine mechanisch gekoppelt ist, kann die Trenneinrichtung praktisch willkürlich zu jedem beliebigen Zeitpunkt betätigt werden oder auch nicht betätigt werden. Durch die programmier­bare Steuerung ist es ohne weiteres möglich, den Zeitpunkt des Abtrennens abhängig von den Webparametern und Daten des Schuß­fadens festzulegen. Ebenso einfach ist es möglich, das Abtren­nen zu unterbinden.By using its own independent drive for the separating device, which is not mechanically coupled to the main drive of the weaving machine, the separating device can practically arbitrarily operated at any time or not operated. With the programmable control it is easily possible to determine the time of severing depending on the weaving parameters and data of the weft. It is just as easy to prevent disconnection.

In weiterer Ausgestaltung der Erfindung wird eine Trenneinrich­tung für eine Webmaschine zum Abtrennen eines eingetragenen Schußfadens von einem bereitgehaltenen Schußfaden während eines Webzyklus vorgesehen, bei welcher die Trenneinrichtung mit ei­nem eigenen, unabhängigen Antrieb versehen ist. Bei dieser Trenneinrichtung läßt sich der Zeitpunkt des Abtrennens belie­big auf den übrigen Webzyklus abstimmen.In a further embodiment of the invention, a separating device for a weaving machine for separating an inserted weft thread from a ready-made weft thread during a weaving cycle is provided, in which the separating device is provided with its own, independent drive. With this separating device, the point in time of the detachment can be matched to the rest of the weaving cycle.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der in der Zeichnung dargestell­ten Ausführungsbeispiele und den Unteransprüchen.

  • Fig. 1 zeigt eine schematische Darstellung einer Webmaschine mit einer erfindungsgemäß angetriebenen und gesteuer­ten Trenneinrichtung,
  • Fig. 2 zeigt einen Schnitt durch die Trenneinrichtung und eine zugehörige Fadenklemme, etwa entlang der Linie II-II der Fig. 1,
  • Fig. 3 einen Schnitt entsprechend Fig. 2 durch eine weitere Ausführungsform,
  • Fig. 4 die Ausführungsform nach Fig. 3 in der Stellung nach einem Schußfadenfehler,
  • Fig. 5 eine Ansicht einer Ausführungsform einer Trennein­richtung und einer Fadenklemme in dem Zustand des Normalbetriebs vor einem Abtrennen eines eingetra­ genen Schußfadens,
  • Fig. 6 einen Schnitt entlang der Linie VI-VI der Fig. 5 und
  • Fig. 7 eine Ansicht auf die Ausführungsform nach Fig. 5 in einer Stellung, die nach einem fehlerhaft eingetra­genen Schußfaden eingenommen wird.
Further features and advantages of the invention result from the following description of the exemplary embodiments shown in the drawing and the subclaims.
  • 1 shows a schematic representation of a weaving machine with a separating device driven and controlled according to the invention,
  • 2 shows a section through the separating device and an associated thread clamp, approximately along the line II-II of FIG. 1,
  • 3 shows a section corresponding to FIG. 2 through a further embodiment,
  • 4 shows the embodiment according to FIG. 3 in the position after a weft defect,
  • Fig. 5 is a view of an embodiment of a cutting device and a thread clamp in the state of normal operation before a separated one weft thread,
  • Fig. 6 is a section along the line VI-VI of Fig. 5 and
  • Fig. 7 is a view of the embodiment of FIG. 5 in a position which is taken after an incorrectly entered weft.

In Fig. 1 sind schematisch die Rahmen (1), das Blatt (2) eine Hauptdüse (3), eine Trenneinrichtung (4), eine Schußfadenklemme (5) und ein Schußfadenwächter (6) einer Luft-Webmaschine wie­dergegeben. Außerdem sind die Kettfäden (7), das Fach (8), die Schußfadenzuführung (9) und die fertige Ware (10) sichtbar. Nach jedem (erfolgreichen) Eintragen eines Schußfadens wird dieser von dem in der Hauptblasdüse (3) bereitgehaltenen näch­sten Schußfaden mittels der Trenneinrichtung (4) abgetrennt.In Fig. 1, the frame (1), the sheet (2), a main nozzle (3), a separator (4), a weft clamp (5) and a weft monitor (6) of an air-weaving machine are shown schematically. In addition, the warp threads (7), the compartment (8), the weft feeder (9) and the finished goods (10) are visible. After each (successful) insertion of a weft, it is separated from the next weft held in the main blowing nozzle (3) by means of the separating device (4).

Nach der vorliegenden Erfindung wird die scherenartige Trenn­einrichtung (4) von einem regelbaren Antrieb (11) betätigt, der seinerseits von einem Rechner (12) gesteuert wird, der die Web­parameter (13) und die übrigen Einschußdaten (14) berücksich­tigt. Der Antrieb (11) ist vorzugsweise ein elektrischer An­trieb, beispielsweise ein Schrittmotor.According to the present invention, the scissor-like separating device (4) is actuated by a controllable drive (11) which in turn is controlled by a computer (12) which takes into account the weaving parameters (13) and the other weft data (14). The drive (11) is preferably an electric drive, for example a stepper motor.

Die Webparameter (13) enthalten Daten bezüglich des Webzyklus, aus denen bestimmt werden kann, zu welchem Zeitpunkt die Trenn­einrichtung (4) in Tätigkeit gesetzt wird,sowie Daten bezüglich des Webmusters und der eventuell verschiedenen Fadensorten, so daß der Rechner (12) innerhalb eines Webzyklus den optimalen Zeitpunkt zur Durchtrennung des Schußfadens ermitteln kann. Die Webparameter (13) können auch Daten bezüglich des Betriebszu­standes der Webmaschine enthalten,und zwar entweder des Zustan­des bei Normalbetrieb oder des Zustandes bei Fadenbruch, beim Anfahren, bei verzögertem Lauf usw. Die Webparameter (13) wer­den manuell über abrufbare Programme oder auch über Sensoren der Webmaschine eingegeben.The weaving parameters (13) contain data relating to the weaving cycle, from which it can be determined at which point in time the separating device (4) is activated, as well as data relating to the weaving pattern and the possibly different types of thread, so that the computer (12) within a Weaving cycle can determine the optimal time for severing the weft. The weaving parameters (13) can also contain data relating to the operating state of the weaving machine, either the state during normal operation or the state when the thread breaks, when starting, when the run is delayed, etc. The weaving parameters (13) are set manually via programs or sensors entered the weaving machine.

Die Schußfadendaten (14) setzen sich in der Hauptsache aus einem vom am Ende des Webfadens angeordneten Schußfadenwächter (6) kommenden Signal (15) und aus eventuell einem oder mehreren Signalen (16) zusammen, die von Sensoren stammen, die den Ver­lauf des Schußfadens im Fach kontrollieren.The weft data (14) mainly consist of a signal (15) coming from the weft monitor (6) arranged at the end of the weaving thread and possibly one or more signals (16) that come from sensors that monitor the course of the weft Check the compartment.

Die Arbeitsweise der Trenneinrichtung gemäß Fig. 1 läßt sich ohne Schwierigkeiten aus der Zeichnung ableiten. Zuerst wird in der üblichen Weise ein Schußfaden (17) eingebracht, der an­schließend, wie in der Fig. 1 dargestellt, mit dem Blatt (2) angeschlagen wird. Dabei wird er an der Einschußseite zwischen die Backen der Schußfadenklemme (5) gedrückt, die sich in ihrer Klemmstellung befindet, so daß der Schußfaden (17) in die ge­schlossene Schußfadenklemme (5) eingeführt wird. Dabei gelangt der Schußfaden (17) auch in den Bereich der Trenneinrichtung (4). Ergeben die Schußradendaten (14), daß der Einschuß ord­nungsgemäß ausgeführt worden ist, wird der Rechner (12) mit Hilfe der eingegebenen Webparameter (13) den Antrieb (11) akti­vieren, wodurch die Trenneinrichtung (4) den eingebrachten Schußfaden (17) von dem in der Schußfadenzuführung (9) und der Hauptblasdüse (3) bereitgehaltenen trennt. Wird allerdings ein fehlerhafter Einschuß festgestellt, kann die Trenneinrichtung (4) daran gehindert werden, den Faden zu durchtrennen, um den fehlerhaften Schußfaden zu entfernen.1 can be derived from the drawing without difficulty. First, a weft thread (17) is introduced in the usual manner, which is then, as shown in FIG. 1, struck with the sheet (2). He is pressed on the weft side between the jaws of the weft clamp (5), which is in its clamping position, so that the weft (17) is inserted into the closed weft clamp (5). The weft thread (17) also reaches the area of the separating device (4). If the weft wheel data (14) indicate that the weft has been carried out correctly, the computer (12) will activate the drive (11) with the help of the entered weaving parameters (13), whereby the separating device (4) removes the inserted weft thread (17) from the in the weft feeder (9) and the main blowing nozzle (3). However, if a faulty weft is found, the separating device (4) can be prevented from cutting the thread in order to remove the faulty weft thread.

Daraus ergibt sich freilich, daß bei der Feststellung eines fehlerhaften Schußfadens (17) die Trenneinrichtung (4) nicht betätigt werden darf, wenn zur Entfernung des Schußfadens die in der NL-Patentanmeldung 86 02 191 beschriebene Arbeitsmethode angewendet wird. Hierbei wird der fehlerhafte Schußfaden (14) durch das Einbringen einer neuen Schußfadenlänge gelöst und aus dem Fach entfernt, etwa so, wie es die Strich-Punkt-Linie (18) in Fig. 1 wiedergibt. Hierbei muß angemerkt werden, daß der Schußfaden (17), auch für den Fall, daß er fehlerhaft ist, vom Blatt bereits in der Schußfadenklemme (5) angeschlagen sein wird, so wie es Fig. 2 im Detail wiedergibt. Daher sollte zweckmäßig bei der Entfernung eines fehlerhaften Schußdfadens (17) außerdem dafür gesorgt werden, daß die Schußfadenklemme (5) zeitweilig geöffnet wird. In einer speziellen Ausführung der Trenneinrichtung nach der Erfindung wird dieser Umstand durch die aufeinander abgestimmte Wirkungsweise der Trennein­richtung (4) und der Schußfadenklemme (5) berücksichtigt, wobei die Schußfadenklemme (5) von dem Antrieb (11) geöffnet wird.It follows from this, of course, that when a faulty weft thread (17) is found, the separating device (4) must not be actuated if the working method described in NL patent application 86 02 191 is used to remove the weft thread. Here, the faulty weft (14) is released by inserting a new weft length and removed from the compartment, approximately as shown by the dash-dot line (18) in Fig. 1. It must be noted here that the weft (17), even in the event that it is defective, will already be struck by the sheet in the weft clamp (5), as shown in FIG. 2 in detail. Therefore should expedient when removing a faulty weft thread (17) also ensure that the weft thread clamp (5) is temporarily opened. In a special embodiment of the separating device according to the invention, this fact is taken into account by the coordinated mode of operation of the separating device (4) and the weft thread clamp (5), the weft thread clamp (5) being opened by the drive (11).

Die Kombination Trenneinrichtung (4) und Schußfadenklemme (5) wird in Fig. 3 schematisch wiedergegeben. Hierbei besitzen so­wohl die Trenneinrichtung (4) als auch die Schußfadenklemme (5) ein festes und ein bewegliches Teil, und zwar die Teile (19 bis 22). Das bewegliche Teil (21) der Schußfadenklemme (5) wird ständig von elastischen Druckelementen, wie etwa einer Druckfe­der (23), an das feste Teil (22) gedrückt.The combination separating device (4) and weft thread clamp (5) is shown schematically in Fig. 3. Both the separating device (4) and the weft thread clamp (5) have a fixed and a movable part, namely the parts (19 to 22). The movable part (21) of the weft clamp (5) is constantly pressed against the fixed part (22) by elastic pressure elements, such as a compression spring (23).

Der Antrieb (11) ist derartig ausgeführt, daß er die Trennein­richtung (4) in drei Stellungen bringen kann: eine geschlossene Stellung und zwei offene Stellungen. Die erste offene Stellung wird in Fig. 3 wiedergegeben. Die Schußfadenklemme (5) ist noch geschlossen. In der zweiten offenen Stellung hat sie den beweg­lichen Teil der Schußfadenklemme (5) mitgenommen, wie in Fig. 4 dargestellt ist, d.h., daß damit gleichzeitig die Schußfaden­klemme (5) geöffnet wurde. Auf diese Weise läßt sich ein feh­lerhafter Schußfaden (17) ohne Behinderung durch die Schußfa­denklemme (5) entfernen.The drive (11) is designed such that it can bring the separating device (4) into three positions: a closed position and two open positions. The first open position is shown in Fig. 3. The weft thread clamp (5) is still closed. In the second open position, it has taken the movable part of the weft clamp (5) with it, as shown in Fig. 4, i.e. that the weft clamp (5) has been opened at the same time. In this way, a faulty weft thread (17) can be removed without hindrance by the weft thread clamp (5).

Es sind verschiedene Kombinationsmöglichkeiten in der aufeinan­der abgestimmten Arbeitsweise der Trenneinrichtung (4) und der Schußfadenklemme (5) denkbar. So kann etwa die Schußfadenklemme (5) jedesmal, wenn ein Schußfaden (17) ins Fach gebracht wird und bevor dieser vom Blatt (2) in der Schußfadenklemme (5) an­geschlagen wird, mit Hilfe der Trenneinrichtung (4) in die ge­öffnete Stellung gedrückt werden. Dadurch wird der Schußfaden (17) einfach zwischen die Teile (21 u.22) gebracht. Die Trenn­einrichtung (4) kann sodann in Trennstellung gebracht und damit der Schußfaden (17) zwischen die Klemmbacken der Schußfaden­klemme (5) geklemmt werden, um anschließend von dem in der Schußfadenzuführung (9) und der Hauptblasdüse bereitgehaltenen getrennt zu werden.Various possible combinations are possible in the coordinated mode of operation of the separating device (4) and the weft thread clamp (5). For example, the weft clamp (5) can be pressed into the open position with the aid of the separating device (4) each time a weft thread (17) is brought into the compartment and before it is struck by the sheet (2) in the weft clamp (5) . As a result, the weft thread (17) is simply brought between the parts (21 and 22). The separating device (4) can then be brought into the separating position and thus the weft thread (17) is clamped between the jaws of the weft thread clamp (5), in order to then be separated from that held ready in the weft thread feeder (9) and the main blowing nozzle.

Die Fig. 5 und 7 geben in zwei Ansichten eine praktische Aus­führung einer Trenneinrichtung (4) wieder, die dem in Fig. 3 und 4 dargestellten Prinzip entspricht.5 and 7 show in two views a practical embodiment of a separating device (4) which corresponds to the principle shown in FIGS. 3 and 4.

Der bewegliche Teil (19) (Schneide) der Trenneinrichtung (4) ist ein Hebelarm, der auf der Welle (24) eines Schrittmotors (25) drehfest angeordnet ist. Der Schrittmotor (25) wird auf­grund einer vorgegebenen Anzahl von Impulsen zum Schneiden um einen bestimmten Drehwinkelbereich verdreht und danach elek­trisch in die Position nach Fig. 5 wieder zurückgedreht. Wie später noch erläutert wird, kann der Schrittmotor aufgrund ei­nes besonderen Signals, das an den Rechner (12) gegeben wird, um einen größeren Drehwinkel zurückgedreht werden, als dies für das Schneiden erforderlich ist.The movable part (19) (cutting edge) of the separating device (4) is a lever arm which is arranged on the shaft (24) of a stepping motor (25) in a rotationally fixed manner. The stepper motor (25) is rotated due to a predetermined number of pulses for cutting by a certain angle of rotation range and then electrically turned back into the position shown in FIG. 5. As will be explained later, the stepper motor can be turned back by a larger angle of rotation than is required for the cutting on the basis of a special signal which is sent to the computer (12).

Der bewegliche Teil (21) der Schußfadenklemme (5) ist über eine starre Verbindung (26) mit einem schwenkbaren Teil (27) verbun­den, der um eine Achse (28) verschwenkbar ist. Die oben genann­te Feder (23) greift an den schwenkbaren Teil (27) an und wird mit Hilfe von Einstellmöglichkeiten (29) den für das Klemmen notwendigen Federdruck eingestellt. Die Achse (28) kann koaxial zur Welle (24) liegen.The movable part (21) of the weft thread clamp (5) is connected via a rigid connection (26) to a pivotable part (27) which can be pivoted about an axis (28). The above-mentioned spring (23) engages on the pivotable part (27) and is adjusted with the aid of setting options (29) the spring pressure necessary for the clamping. The axis (28) can be coaxial with the shaft (24).

Wie in Fig. 6 zu sehen ist, können die festen Teile (20 und 22) auch einteilig ausgeführt werden.As can be seen in Fig. 6, the fixed parts (20 and 22) can also be made in one piece.

Die Fig. 7 gibt die Stellung der Trenneinrichtung (4) nach Fig. 5 und 6 wieder, die der Stellung in der schematischen Wiederga­be nach Fig. 4 entspricht. Hierbei drückt die Oberkante (30) des beweglichen Teils (19) (Schneide) die Verbindung (26) nach oben, wodurch die Schußfadenklemme (5) geöffnet wird.FIG. 7 shows the position of the separating device (4) according to FIGS. 5 and 6, which corresponds to the position in the schematic representation according to FIG. 4. Here, the upper edge (30) of the movable part (19) (cutting edge) presses the connection (26) upwards, as a result of which the weft thread clamp (5) is opened.

Wie aus Fig. 6 noch ersichtlich ist, trägt die Oberkante (30) ein Einstellelement (31), das in der Höhe verstellbar ist, d.h. lotrecht zur Schneide, so daß sich die Öffnung der Schußfaden­klemme (5) in Abhängigkeit vom Öffnungswinkel der Trenneinrich­tung (4) regeln läßt.As can still be seen from Fig. 6, the upper edge (30) carries an adjusting element (31) which is adjustable in height, i.e. perpendicular to the cutting edge, so that the opening of the weft thread clamp (5) can be regulated as a function of the opening angle of the separating device (4).

Die vorliegende Erfindung beschränkt sich keineswegs auf die als Beispiel beschriebene und in Zeichnungen wiedergegebene Trenneinrichtung, sondern kann im Erfindungsumfang in allerlei Formen und Größen verwirklicht werden.The present invention is in no way limited to the separating device described as an example and shown in the drawings, but can be realized in all forms and sizes within the scope of the invention.

Claims (10)

1. Verfahren zum Abtrennen eines eingetragenen Schußfadens von einem bereitgehaltenen Schußfaden an einer Webmaschine, mittels einer während eines Webzyklus tätigwerdenden Trennein­richtung, dadurch gekennzeichnet, daß die Trenneinrichtung (4) mittels eines eigenen, unabhängigen Antriebs (11) betätigt wird, der mittels einer programmierbaren Steuerung (12) ge­steuert wird.1. A method for separating a registered weft from a ready-made weft on a loom, by means of a separating device which becomes active during a weaving cycle, characterized in that the separating device (4) is actuated by means of a separate, independent drive (11) which is operated by means of a programmable control (12) is controlled. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei Auftreten eines Schußfadenfehlers in die Steuerung (12) ein die Betätigung der Trenneinrichtung (4) unterbindendes Signal (15, 16) eingegeben wird,2. The method according to claim 1, characterized in that when a weft error occurs in the control (12) an actuation of the separating device (4) preventing signal (15, 16) is entered, 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeich­net, daß eine Fadenklemme (5) für den eingetragenen Schußfaden vorgesehen ist, die bei Feststellen eines Schußfadenfehlers ge­öffnet wird.3. The method according to claim 1 or 2, characterized in that a thread clamp (5) is provided for the registered weft, which is opened when a weft error is detected. 4. Trenneinrichtung für eine Webmaschine zum Abtrennen ei­nes eingetragenen Schußfadens von einem bereitgehaltenen Schuß­faden während eines Webzyklus, dadurch gekennzeichnet, daß die Trenneinrichtung (4) mit einem eigenen, unabhängigen Antrieb (11) versehen ist.4. Separating device for a weaving machine for separating a registered weft thread from a ready-made weft thread during a weaving cycle, characterized in that the separating device (4) is provided with its own, independent drive (11). 5. Trenneinrichtung nach Anspruch 4, dadurch gekennzeich­net, daß der Antrieb (11) mit einer vorprogrammierbaren Steue­rung (12) verbunden ist.5. Separating device according to claim 4, characterized in that the drive (11) is connected to a pre-programmable controller (12). 6. Trenneinrichtung nach Anspruch 4 oder 5, dadurch ge­kennzeichnet, daß Mittel (6) zum Erfassen eines Schußfadenfeh­lers vorgesehen sind, die mit der Steuerung (12) verbunden sind, welche bei Erhalt eines von den Mitteln (6) zum Erfassen abgegebenen Fehlersignals (15) ein Betätigen der Trenneinrich­tung (4) unterbindet.6. Separating device according to claim 4 or 5, characterized in that means (6) for detecting a weft error are provided, which are connected to the controller (12), which upon receipt of an error signal from the means (6) for detection (15 ) prevents actuation of the separating device (4). 7. Trenneinrichtung nach einem der Ansprüche 4 bis 6, da­durch gekennzeichnet, daß die federnd in Klemmstellung gehal­tene Fadenklemme (5) mit Mitteln zum Öffnen versehen ist, die von dem Antrieb (11) der Trenneinrichtung (4) betätigbar sind.7. Separating device according to one of claims 4 to 6, characterized in that the spring clamp (5) held in the clamped position is provided with means for opening which can be actuated by the drive (11) of the separating device (4). 8. Trenneinrichtung nach einem der Ansprüche 4 bis 7, da­durch gekennzeichnet, daß eine bewegliche Schneide (19) vorge­sehen ist, die von einem Schrittmotor (25) angetrieben ist, der an die Steuerung (12) angeschlossen ist.8. Separating device according to one of claims 4 to 7, characterized in that a movable cutting edge (19) is provided which is driven by a stepper motor (25) which is connected to the controller (12). 9. Trenneinrichtung nach einem der Ansprüche 4 bis 8, da­durch gekennzeichnet, daß die Schneide (19) auf der Welle (24) des Schrittmotors (25) angeordnet ist, der in beiden Drehrich­tungen antreibbar ist.9. Cutting device according to one of claims 4 to 8, characterized in that the cutting edge (19) on the shaft (24) of the stepping motor (25) is arranged which can be driven in both directions of rotation. 10. Trenneinrichtung nach Anspruch 8 oder 9, dadurch ge­kennzeichnet, daß die Fadenklemme (5) mit einem in den Bewe­gungsbereich der Schneide (19) ragenden Mitnehmer (26) versehen ist, daß der Schrittmotor (25) bei einem Schußfaden-Fehlersig­nal (15) um einen den Drehwinkelbereich zum Schneiden über­schreitenden Drehwinkel zurückdrehbar ist, wobei die Rückseite (30, 31) der Schneide (19) gegen den Mitnehmer (26) der Faden­klemme (5) anläuft.10. Cutting device according to claim 8 or 9, characterized in that the thread clamp (5) with a in the range of motion of the cutting edge (19) protruding driver (26) is provided that the stepper motor (25) at a weft error signal (15) Can be turned back by an angle of rotation exceeding the angle of rotation range for cutting, the rear side (30, 31) of the cutting edge (19) running against the driver (26) of the thread clamp (5).
EP88102500A 1987-03-09 1988-02-20 Process for cutting an inserted weft and cutting device Expired - Lifetime EP0284766B1 (en)

Applications Claiming Priority (2)

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BE8700224A BE1000369A4 (en) 1987-03-09 1987-03-09 Method for ordering a cutting device for impact on wires looms and cutting device used for this purpose.
BE8700224 1987-03-09

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EP0284766A1 true EP0284766A1 (en) 1988-10-05
EP0284766B1 EP0284766B1 (en) 1991-05-15

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EP (1) EP0284766B1 (en)
JP (1) JP2793592B2 (en)
BE (1) BE1000369A4 (en)
DE (1) DE3862789D1 (en)
ES (1) ES2022486B3 (en)

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EP0683256A1 (en) * 1994-05-20 1995-11-22 NUOVO PIGNONE S.p.A. Weft cutter for air loom
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EP0839938A1 (en) * 1996-10-07 1998-05-06 Sulzer Rüti Ag Process to cut a weft to insert in a gripper loom
EP0867543A2 (en) * 1997-03-27 1998-09-30 Lindauer Dornier Gesellschaft M.B.H Method and device for controlling and minitoring the operation of yarn scissors driven by electric motor on looms
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EP0679744A1 (en) * 1994-04-29 1995-11-02 PANTER S.r.l. Weft yarn cutting device for looms
EP0683256A1 (en) * 1994-05-20 1995-11-22 NUOVO PIGNONE S.p.A. Weft cutter for air loom
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WO1997013901A1 (en) * 1995-10-10 1997-04-17 Textilma Ag Mechanical loom with pneumatic weft thread insertion
CN1061714C (en) * 1995-10-10 2001-02-07 特克斯蒂尔马有限公司 Mechanical loom with pneumatic weft threat insertion
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EP0867543A3 (en) * 1997-03-27 1999-12-15 Lindauer Dornier Gesellschaft M.B.H Method and device for controlling and minitoring the operation of yarn scissors driven by electric motor on looms
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EP0953664A1 (en) * 1998-04-28 1999-11-03 Sulzer Rüti Ag Device to cut a weft to be inserted and system to insert a weft with such device
US6450210B2 (en) 2000-03-20 2002-09-17 Lindauer Dornier Gesellschaft Mbh Linear motor yarn-cutting device for mechanical looms
EP1136606A1 (en) * 2000-03-20 2001-09-26 Lindauer Dornier Gesellschaft M.B.H Thread cutting device for weaving looms
EP1367158A1 (en) * 2002-05-31 2003-12-03 Lindauer Dornier Gesellschaft M.B.H Process and device for severing the filling yarn following a weft insertion
EP1447465A2 (en) * 2003-02-14 2004-08-18 Tsudakoma Kogyo Kabushiki Kaisha Method of driving waste selvage cutter for shuttleless loom and drive device for carrying out the same
EP1447465A3 (en) * 2003-02-14 2005-01-19 Tsudakoma Kogyo Kabushiki Kaisha Method of driving waste selvage cutter for shuttleless loom and drive device for carrying out the same
WO2006027240A1 (en) * 2004-09-08 2006-03-16 Picanol N.V. Method for gripping weft threads gripping device and loom with at least one gripper device for weft threads
BE1016183A3 (en) * 2004-09-08 2006-04-04 Picanol Nv METHOD AND APPARATUS FOR CLIPPING AN IMPRESSION THREAD IN A WEAVING MACHINE.
WO2007105240A1 (en) * 2006-03-15 2007-09-20 Renzo Lisi Device for cutting yarns and light fabrics in textile
EP2098625A1 (en) 2008-03-06 2009-09-09 Picanol N.V. Method and loom with a device for preventing weaving in

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DE3862789D1 (en) 1991-06-20
JP2793592B2 (en) 1998-09-03
US4834145A (en) 1989-05-30
BE1000369A4 (en) 1988-11-08
EP0284766B1 (en) 1991-05-15
ES2022486B3 (en) 1991-12-01
JPS63235551A (en) 1988-09-30

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