EP2004893B1 - Gripper-bar drive of a weaving machine, and weaving machine having a gripper system - Google Patents

Gripper-bar drive of a weaving machine, and weaving machine having a gripper system Download PDF

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Publication number
EP2004893B1
EP2004893B1 EP07722068A EP07722068A EP2004893B1 EP 2004893 B1 EP2004893 B1 EP 2004893B1 EP 07722068 A EP07722068 A EP 07722068A EP 07722068 A EP07722068 A EP 07722068A EP 2004893 B1 EP2004893 B1 EP 2004893B1
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EP
European Patent Office
Prior art keywords
gripper bar
gripper
drive according
screw
bar drive
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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.)
Not-in-force
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EP07722068A
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German (de)
French (fr)
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EP2004893A1 (en
Inventor
Stephan Arndt
Werner Breyer
Stefan Kimmel
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Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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Publication of EP2004893A1 publication Critical patent/EP2004893A1/en
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    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/271—Rapiers
    • D03D47/273—Rapier rods
    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/275—Drive mechanisms

Definitions

  • the invention relates to a gripper bar drive a weaving machine, in which a reversibly rotationally driven drive member of the rapier bar in its longitudinal direction reciprocating movement granted, according to the preamble of claim 1.
  • a gripper bar drive is from the DE 195 38 287 C1 known.
  • the reversibly driven for rotation drive member there consists of a gear which engages in a arranged on the gripper rod rack. By the gear rotates alternately in different directions of rotation, the rapier bar is reciprocated, thereby introducing the weft thread in the shed of the loom.
  • a second driven rapier bar At the opposite end of the open shed is a second driven rapier bar, which takes over the weft end in the middle of the open shed and conveys it to the opposite side of the resulting fabric web.
  • the known gripper bars are stiff and at the same time low in mass and are usually made of fiber-reinforced plastic. They have a U-shaped profile cross-section with an integrated rack-like toothing.
  • the weft insertion power between the drive gear and the rack located on the gripper bar is limited because the supporting surface is limited in the power transmission to one to a maximum of two tooth flanks of the drive gear.
  • a larger dimensioning of the gear and the rack is contrary to the requirement of lightweight construction; because the racks have to be extremely accelerated and decelerated at today's usual high web speeds.
  • the limited weft insertion performance therefore limits the maximum speed of the loom.
  • the invention is therefore an object of the invention to provide a gripper bar drive of the type mentioned above, which allows higher weft insertion and is subject to less wear.
  • a screw gear is provided with a screw as a drive member which cooperates with a rotationally fixed, engaging in the thread of the screw spindle element and thereby drives the gripper bar, there are more favorable conditions for the transmission than in the rack and pinion drive according to the prior art ,
  • the screw drive allows favorable power engagement ratios than the previously customary rack drive and thus a faster movement of the gripper bars.
  • the thread pitch of the screw located on the screw thread over the entire length of the screw can be consistent. But it is also possible to make the thread pitch over the length of the screw variable. In this way, a special control characteristic for the movement of the gripper bars can be adjusted. Even with a constant over a stroke of the gripper bar drive speed of the screw thus can be a variable Set process of weft insertion; The speed of the rapier bar is adapted to the current requirements in the individual phases of the weft insertion. In this way, for example, the acceleration of the rapier bar after detecting the weft end is predetermined so that the lowest possible voltage peaks occur in the weft.
  • An advantageous braking of the gripper bars in the region of the center transfer of the weft thread from the first gripper to the second gripper can be achieved with a corresponding pitch of the threads. Furthermore, a speed limit in the closing phase of the entry is possible if the weft thread on the opposite side of the resulting fabric web is released on its arrival by the gripper.
  • the thread of the screw is advantageously a movement thread whose threads form guide grooves, engage in the sliders of the coupling element.
  • the sliders may be fixedly connected to the coupling member, e.g. be integrally formed thereon.
  • the sliders may be designed as rolling bearings, wherein the outer rings of the rolling bearings roll on the flanks of the guide grooves.
  • the coupling element is designed as a nut whose internal thread cooperates with the thread of the screw.
  • the mother is designed as a ball screw nut and balls are guided as sliders in the ball-screw-shaped guide grooves of the screw.
  • a particularly highly loadable and uniform variant of the gripper bar drive according to the invention results with a two-start movement thread formed by the guide grooves, if provided is that the coupling element is formed in the form of a two-pronged fork, which engages from the gripper bar, the threaded spindle, wherein at the ends of each fork teeth a slider is arranged so that each engages a slider in each of the threads and the two sliders opposite each other.
  • the reversing rotary drive of the rapier bar can be derived from the main shaft of the loom via an intermediate gear, e.g. via a crank mechanism or an eccentric disc.
  • the already mentioned particularly compact design of the gripper bar drive according to the invention makes it possible according to a further advantageous embodiment, a housing enclosing the screw spindle structurally combined with a slotted rail on which the gripper bar is guided linearly movable.
  • a housing enclosing the screw spindle structurally combined with a slotted rail on which the gripper bar is guided linearly movable.
  • the invention further relates to a loom with a gripper system for registering the weft threads, in which the gripper bar drive according to the invention is provided.
  • the FIG. 1 shows the gripper bar 3, which has at one end the unspecified gripper 3.1.
  • This can be, for example, a positively operated gripper clamp or a simple, spring-operated gripper clamp for the weft.
  • the coupling element 2 is rigidly secured.
  • the screw 1 Parallel to the longitudinal direction of the gripper bar 3 extends the screw 1. It has in the illustrated embodiment, a two-speed movement thread in the form of a flat thread. The threads are formed by the guide grooves 1.1 and 1.2, which are located on the screw 1.
  • the coupling element 2 is fork-shaped, cf. FIG. 2 , At the ends of the forks is ever a slider 2.1, 2.2 attached, the sliders 2.1, 2.2 are thus in relation to the central axis of the screw shaft 1 1.3 diametrically opposite each other in a radial plane. They engage in the guide grooves 1.1 and 1.2 and are slidable in these.
  • the pitch of the guide grooves 1.1, 1.2 over the entire length of the screw is constant.
  • the sliders 2.1, 2.2 are rigidly attached to the forks of the coupling element 2 or formed integrally therewith.
  • the pitch of the guide grooves 1.1 and 1.2 over the length of the screw 1 is variable.
  • certain control properties of the gripper bars 3 can be adjusted.
  • the sliders should be 2.1, 2.2 movably mounted on the coupling element 2.
  • the sliders 2.1, 2.2 act as sliding blocks when the screw 1 is rotated.
  • the slides 2.1, 2.2, the width of the guide grooves 1.1, 1.2 completely fill, without the sliding property affect.
  • An unillustrated cylindrical slider, whose central axis would run radially to the central axis 1.3 of the screw 1, must therefore have an outer diameter of almost the width of the guide grooves 1.1, 1.2.
  • the gripper bar 3 is slidably guided in a slotted rail 4 in its longitudinal direction. In the slot of the slotted rail 4 and the coupling element 2 with the peg-shaped extension 2.3 is slidably guided.
  • the screw 1 is rotated by a spur gear 5 in rotation, which consists of a drive gear 5.1 and a drive gear 5.2.
  • the slotted rail 4 may also have other guide parts, e.g. are arranged laterally, or a gripper bar 3 cross-strap, which prevents the gripper bar 3 breaks up.
  • FIG. 2 shows that the gripper bar 3 has a cross section of a rectangular hollow profile. Since the customary in the prior art toothing is eliminated, the rapier 3 can be designed to work under the aspects of optimal stability and the lowest possible weight.
  • the visible in the illustrated embodiment rectangular cross section of the hollow profile has, for example, a significantly higher resistance to bending and torsion than the U-profile often used in toothed rapiers.
  • This design offers the possibility of lightweight construction in conjunction with high stability. Despite the particularly high accelerations of the rapier 3, which occur in particular in wide weaving machines, thereby the loads of the entire drive system and the required drive power can be limited.
  • the screw 1 is enclosed by a housing 8 and forms together with the slotted guide rail 4 a structural unit.
  • the screw 1 is driven via the spur gear 5 in a reciprocating rotary motion.
  • the screw 1 is reliably secured against longitudinal displacement.
  • the slides acting as sliding blocks 2.1, 2.2 therefore give the coupling element 2 a longitudinal movement in the direction of the central axis 1.3 of the screw 1.
  • This is transmitted to the gripper bar 3, because the coupling element 2 is firmly connected to the gripper bar 3. Therefore, the gripper bar 3 performs due to their leadership in the slotted rail 4 a precisely controlled linear reciprocating motion in its longitudinal direction.
  • the direction arrow 6 in FIG. 1 is the linear movement of the gripper bar 3 indicated, while the direction of rotation arrows 7 illustrate the changing direction of rotation of the screw 1.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Advancing Webs (AREA)
  • Discharge By Other Means (AREA)

Abstract

A gripper rod drive for a loom, in which a reversibly rotary driven driving member moves the rod longitudinally to an fro, comprises a screw drive with a screw spindle (1) as driving member and a rotationally fixed coupling member (2) gripping the screw spindle thread, connected with the gripper rod (3). An independent claim is included for a loom with a gripper system for insertion of weft fibers, which includes the gripper rod system.

Description

Die Erfindung betrifft einen Greiferstangen-Antrieb einer Webmaschine, bei dem ein reversierend drehangetriebenes Antriebsglied der Greiferstange eine in ihrer Längsrichtung hin- und hergehende Bewegung erteilt, gemäß dem Oberbegriff des Anspruchs 1. Ein derartiger Greiferstangen-Antrieb ist aus der DE 195 38 287 C1 bekannt. Das reversierend zur Drehung angetriebene Antriebsglied besteht dort aus einem Zahnrad, das in eine an der Greiferstange angeordnete Zahnstange eingreift. Indem das Zahnrad sich wechselnd in unterschiedlichen Drehrichtungen dreht, wird die Greiferstange hin- und herbewegt und führt dabei den Schussfaden in das Webfach der Webmaschine ein. An dem gegenüberliegenden Ende des geöffneten Webfaches befindet sich eine zweite angetriebene Greiferstange, die das Schussfadenende in der Mitte des geöffneten Webfaches übernimmt und ihn zur gegenüberliegenden Seite der entstehenden Gewebebahn befördert. Zu diesem Zweck befinden sich an den Enden der Greiferstange besonders ausgebildete Greifer wie z.B. positiv betätigte Greiferklemmen oder einfache, federbetätigte Greiferklemmen.The invention relates to a gripper bar drive a weaving machine, in which a reversibly rotationally driven drive member of the rapier bar in its longitudinal direction reciprocating movement granted, according to the preamble of claim 1. Such a gripper bar drive is from the DE 195 38 287 C1 known. The reversibly driven for rotation drive member there consists of a gear which engages in a arranged on the gripper rod rack. By the gear rotates alternately in different directions of rotation, the rapier bar is reciprocated, thereby introducing the weft thread in the shed of the loom. At the opposite end of the open shed is a second driven rapier bar, which takes over the weft end in the middle of the open shed and conveys it to the opposite side of the resulting fabric web. For this purpose are located at the ends of the gripper bar specially trained gripper such as positively actuated gripper terminals or simple, spring-operated gripper terminals.

Die bekannten Greiferstangen sind steif und zugleich massearm ausgebildet und bestehen in der Regel aus faserverstärktem Kunststoff. Sie besitzen einen U-förmigen Profilquerschnitt mit einer integrierten zahnstangenartigen Verzahnung. Die Schusseintragsleistung zwischen dem Antriebszahnrad und der an der Greiferstange befindlichen Zahnstange ist jedoch begrenzt, weil die tragende Fläche bei der Kraftübertragung auf eine bis maximal zwei Zahnflanken des Antriebszahnrades begrenzt ist.The known gripper bars are stiff and at the same time low in mass and are usually made of fiber-reinforced plastic. They have a U-shaped profile cross-section with an integrated rack-like toothing. However, the weft insertion power between the drive gear and the rack located on the gripper bar is limited because the supporting surface is limited in the power transmission to one to a maximum of two tooth flanks of the drive gear.

Einer größeren Dimensionierung des Zahnrades und der Zahnstange steht das Erfordernis der Leichtbauweise entgegen; denn die Zahnstangen müssen bei den heute üblichen großen Webgeschwindigkeiten extrem stark beschleunigt und abgebremst werden. Die begrenzte Schusseintragsleistung begrenzt deshalb die maximale Drehzahl der Webmaschine.A larger dimensioning of the gear and the rack is contrary to the requirement of lightweight construction; because the racks have to be extremely accelerated and decelerated at today's usual high web speeds. The limited weft insertion performance therefore limits the maximum speed of the loom.

Um die übertragbare Leistung zu erhöhen, ist deshalb gemäß der DE 195 38 287 C1 schon eine Kühlung der kritischen Kraftübertragungsstelle zwischen dem Antriebszahnrad und der Verzahnung an der Greiferstange vorgesehen worden. Aber trotz dieser Maßnahme bleibt die maximale Schusseintragleistung begrenzt. Wegen der unvermeidlichen Reibung und der hohen Flächenpressung zwischen den Zahnflanken des Antriebszahnrades und der Zahnstange ist außerdem ein gewisser Verschleiß nicht zu verhindern.In order to increase the transmittable power, therefore, according to the DE 195 38 287 C1 already a cooling of the critical power transmission point between the Drive gear and the teeth on the gripper bar have been provided. But despite this measure, the maximum weft insertion power remains limited. In addition, due to the inevitable friction and the high surface pressure between the tooth flanks of the drive gear and the rack a certain amount of wear can not be prevented.

Der Erfindung liegt deshalb die Aufgabe zugrunde, einen Greiferstangen-Antrieb der eingangs genannten Art zu schaffen, der höhere Schusseintragsleistungen ermöglicht und einem geringeren Verschleiß unterliegt.The invention is therefore an object of the invention to provide a gripper bar drive of the type mentioned above, which allows higher weft insertion and is subject to less wear.

Die Lösung dieser Aufgabe gelingt erfindungsgemäß durch die Gesamtheit der in dem Anspruch 1 angegebenen Merkmale.The solution of this object is achieved according to the invention by the totality of the features specified in the claim 1.

Indem erfindungsgemäß ein Schraubengetriebe mit einer Schraubenspindel als Antriebsglied vorgesehen wird, das mit einem drehfest angeordneten, in das Gewinde der Schraubenspindel eingreifenden Kuppelglied zusammenwirkt und dadurch die Greiferstange antreibt, ergeben sich günstigere Voraussetzungen für die Kraftübertragung als bei dem Zahnstangen-Antrieb gemäß dem Stand der Technik. Der Schraubentrieb erlaubt günstigere Krafteingriffsverhältnisse als der bisher übliche Zahnstangenantrieb und damit auch eine schnellere Bewegung der Greiferstangen.By the invention, a screw gear is provided with a screw as a drive member which cooperates with a rotationally fixed, engaging in the thread of the screw spindle element and thereby drives the gripper bar, there are more favorable conditions for the transmission than in the rack and pinion drive according to the prior art , The screw drive allows favorable power engagement ratios than the previously customary rack drive and thus a faster movement of the gripper bars.

Ein besonders einfacher Aufbau ergibt sich, wenn gemäß einer ersten Weiterbildung die Schraubenspindel und die Greiferstange zueinander angeordnet sind und das Kuppelglied sich an dem dem Greifer entgegengesetzten Ende der Greiferstange befindet.A particularly simple construction results when, according to a first development, the screw spindle and the gripper bar are arranged relative to one another and the coupling element is located at the gripper's opposite end of the gripper bar.

In einer ersten Ausführung kann die Gewindesteigung des an der Schraubenspindel befindlichen Gewindes über die gesamte Länge der Schraubenspindel gleichbleibend sein. Es besteht aber auch die Möglichkeit, die Gewindesteigung über die Länge der Schraubenspindel veränderlich zu machen. Auf diese Weise lässt sich eine besondere Steuercharakteristik für die Bewegung der Greiferstangen einstellen. Auch bei einer über einen Hub der Greiferstange konstanten Antriebsdrehzahl der Schraubenspindel lässt sich somit ein variabler Ablauf des Schusseintrags einstellen; die Geschwindigkeit der Greiferstange wird in den einzelnen Phasen des Schusseintrages den momentanen Anforderungen angepasst. Auf diese Weise wird beispielsweise die Beschleunigung der Greiferstange nach dem Erfassen des Schussfadenendes so vorgegeben, dass möglichst geringe Spannungsspitzen im Schussfaden auftreten. Auch ein vorteilhaftes Abbremsen der Greiferstangen im Bereich der Mittenübergabe des Schussfadens von dem ersten Greifer auf den zweiten Greifer kann mit einer entsprechenden Steigung der Gewindegänge erreicht werden. Ferner ist eine Geschwindigkeitsbegrenzung in der Schlussphase des Eintrags möglich, wenn der Schussfaden an der gegenüberliegenden Seite der entstehenden Gewebebahn bei seiner Ankunft von dem Greifer freigegeben wird.In a first embodiment, the thread pitch of the screw located on the screw thread over the entire length of the screw can be consistent. But it is also possible to make the thread pitch over the length of the screw variable. In this way, a special control characteristic for the movement of the gripper bars can be adjusted. Even with a constant over a stroke of the gripper bar drive speed of the screw thus can be a variable Set process of weft insertion; The speed of the rapier bar is adapted to the current requirements in the individual phases of the weft insertion. In this way, for example, the acceleration of the rapier bar after detecting the weft end is predetermined so that the lowest possible voltage peaks occur in the weft. An advantageous braking of the gripper bars in the region of the center transfer of the weft thread from the first gripper to the second gripper can be achieved with a corresponding pitch of the threads. Furthermore, a speed limit in the closing phase of the entry is possible if the weft thread on the opposite side of the resulting fabric web is released on its arrival by the gripper.

Das Gewinde der Schraubenspindel ist vorteilhaft ein Bewegungsgewinde, dessen Gewindegänge Führungsnuten bilden, in die Gleitstücke des Kuppelgliedes eingreifen. Bei der Ausführung mit gleichbleibender Gewindesteigung können die Gleitstücke fest mit dem Kuppelglied verbunden sein, z.B. einstückig daran ausgebildet sein.The thread of the screw is advantageously a movement thread whose threads form guide grooves, engage in the sliders of the coupling element. In the constant pitch design, the sliders may be fixedly connected to the coupling member, e.g. be integrally formed thereon.

Insbesondere bei der Ausführung mit veränderlicher Gewindesteigung ist jedoch eine bewegliche Befestigung der Gleitstücke an dem Kuppelglied geboten. Beispielsweise können die Gleitstücke als Wälzlager ausgebildet sein, wobei die Außenringe der Wälzlager an den Flanken der Führungsnuten abrollen.In particular, in the variable pitch design, however, a movable attachment of the sliders on the coupling element is required. For example, the sliders may be designed as rolling bearings, wherein the outer rings of the rolling bearings roll on the flanks of the guide grooves.

Gemäß einer weiteren vorteilhaften Ausgestaltung wird das Kuppelglied als Mutter ausgebildet, deren Innengewinde mit dem Gewinde der Schraubenspindel zusammenwirkt. Eine besonders präzise und dennoch hoch belastbare Variante dieser Ausführung kommt dann zustande, wenn gemäß einer weiteren Ausgestaltung die Mutter als Kugelgewindemutter ausgebildet ist und Kugeln als Gleitstücke in den kugelgewindeförmigen Führungsnuten der Schraubenspindel geführt sind.According to a further advantageous embodiment, the coupling element is designed as a nut whose internal thread cooperates with the thread of the screw. A particularly precise and yet highly resilient variant of this embodiment comes about when according to a further embodiment, the mother is designed as a ball screw nut and balls are guided as sliders in the ball-screw-shaped guide grooves of the screw.

Eine besonders hoch belastbare und gleichmäßige Variante des erfindungsgemäßen Greiferstangen-Antriebs ergibt sich mit einem durch die Führungsnuten gebildeten zweigängigen Bewegungsgewinde, wenn vorgesehen wird, dass das Kuppelglied in der Form einer zweizinkigen Gabel ausgebildet ist, die ausgehend von der Greiferstange die Gewindespindel umgreift, wobei an den Enden eines jeden Gabelzinkens ein Gleitstück angeordnet ist, so dass je ein Gleitstück in je eine der Gewindegänge eingreift und die beiden Gleitstücke einander gegenüberliegen.A particularly highly loadable and uniform variant of the gripper bar drive according to the invention results with a two-start movement thread formed by the guide grooves, if provided is that the coupling element is formed in the form of a two-pronged fork, which engages from the gripper bar, the threaded spindle, wherein at the ends of each fork teeth a slider is arranged so that each engages a slider in each of the threads and the two sliders opposite each other.

Trotz der hohen Belastbarkeit ergibt sich hierbei eine besonders kompakte Konstruktion, die durch die gabelförmige Ausbildung des Kuppelgliedes mit zwei Zinken zustande kommt. Grundsätzlich ist auch eine Ausführung mit mehr als zwei Gewindegängen in Betracht zu ziehen, wobei jedoch für das Kuppelglied eine größere axiale Erstreckung erforderlich wird.Despite the high load capacity, this results in a particularly compact construction, which comes about through the fork-shaped design of the coupling element with two prongs. In principle, a design with more than two threads is to be considered, but for the coupling element a greater axial extent is required.

Der reversierende Drehantrieb der Greiferstange kann von der Hauptwelle der Webmaschine über ein Zwischengetriebe abgeleitet werden, z.B. über einen Kurbeltrieb oder eine Exzenterscheibe.The reversing rotary drive of the rapier bar can be derived from the main shaft of the loom via an intermediate gear, e.g. via a crank mechanism or an eccentric disc.

Aber auch ein einzelner direkter oder indirekter Drehantrieb kann vorteilhaft in Betracht gezogen werden, insbesondere ein elektrischer Servomotor. Hierbei ergeben sich weitere vorteilhafte Möglichkeiten für eine zusätzliche elektronische Steuerung.But even a single direct or indirect rotary drive can be considered advantageous, in particular an electric servo motor. This results in further advantageous possibilities for an additional electronic control.

Die schon erwähnte besonders kompakte Bauweise des erfindungsgemäßen Greiferstangen-Antriebs ermöglicht es, gemäß einer weiteren vorteilhaften Ausgestaltung ein die Schraubenspindel umschließendes Gehäuse baulich mit einer geschlitzten Schiene zusammenzufassen, an der die Greiferstange linear beweglich geführt ist. Neben dem Funktionsvorteil des Schraubentriebes wird somit auch eine gekapselte Bauweise möglich, was beides zusammen den Verschleiß verringert und eine lange störungsfreie Betriebsdauer ermöglicht.The already mentioned particularly compact design of the gripper bar drive according to the invention makes it possible according to a further advantageous embodiment, a housing enclosing the screw spindle structurally combined with a slotted rail on which the gripper bar is guided linearly movable. In addition to the functional advantage of the screw drive thus an encapsulated construction is possible, which together reduces both the wear and allows a long trouble-free operation.

Die Erfindung betrifft weiterhin eine Webmaschine mit einem Greifersystem zum Eintragen der Schussfäden, bei der der erfindungsgemäße Greiferstangen-Antrieb vorgesehen ist.The invention further relates to a loom with a gripper system for registering the weft threads, in which the gripper bar drive according to the invention is provided.

Die Erfindung und weitere sich ergebende Vorteile werden nachstehend anhand eines Ausführungsbeispiels noch näher erläutert.The invention and further resulting advantages will be explained in more detail below with reference to an embodiment.

In den Zeichnungen zeigen:

Figur 1
die schematische Darstellung eines erfindungsgemäßen Greiferstangen-Antriebs in der Seitenansicht und
Figur 2
die Schnittzeichnung gemäß Schnitt A-A aus Figur 1.
In the drawings show:
FIG. 1
the schematic representation of a gripper bar drive according to the invention in side view and
FIG. 2
the sectional drawing from section AA FIG. 1 ,

Die Figur 1 zeigt die Greiferstange 3, die an ihrem einen Ende den nicht näher ausgeführten Greifer 3.1 aufweist. Dieser kann beispielsweise eine positiv betätigte Greiferklemme oder eine einfache, federbetätigte Greiferklemme für den Schussfaden sein. An dem anderen Ende der Greiferstange 3 ist das Kuppelglied 2 starr befestigt.The FIG. 1 shows the gripper bar 3, which has at one end the unspecified gripper 3.1. This can be, for example, a positively operated gripper clamp or a simple, spring-operated gripper clamp for the weft. At the other end of the gripper bar 3, the coupling element 2 is rigidly secured.

Parallel zu der Längsrichtung der Greiferstange 3 erstreckt sich die Schraubenspindel 1. Sie weist in dem dargestellten Ausführungsbeispiel ein zweigängiges Bewegungsgewinde in der Form eines Flachgewindes auf. Die Gewindegänge werden durch die Führungsnuten 1.1 und 1.2 gebildet, die sich an der Schraubenspindel 1 befinden.Parallel to the longitudinal direction of the gripper bar 3 extends the screw 1. It has in the illustrated embodiment, a two-speed movement thread in the form of a flat thread. The threads are formed by the guide grooves 1.1 and 1.2, which are located on the screw 1.

Das Kuppelglied 2 ist gabelförmig ausgebildet, vgl. Figur 2. Mit der Gabel übergreift das Kuppelglied 2 die Schraubenspindel 1. An den Enden der Gabelzinken ist je ein Gleitstück 2.1, 2.2 angebracht, die Gleitstücke 2.1, 2.2 liegen somit in Bezug auf die Mittelachse 1.3 der Schraubenspindel 1 einander diametral in einer Radialebene gegenüber. Sie greifen in die Führungsnuten 1.1 und 1.2 ein und sind in diesen verschiebbar.The coupling element 2 is fork-shaped, cf. FIG. 2 , At the ends of the forks is ever a slider 2.1, 2.2 attached, the sliders 2.1, 2.2 are thus in relation to the central axis of the screw shaft 1 1.3 diametrically opposite each other in a radial plane. They engage in the guide grooves 1.1 and 1.2 and are slidable in these.

Bei der dargestellten Ausführungsform der Schraubenspindel 1 ist die Steigung der Führungsnuten 1.1, 1.2 über die gesamte Länge der Schraubenspindel gleichbleibend. Die Gleitstücke 2.1, 2.2 sind starr an den Gabelzinken des Kuppelgliedes 2 angebracht oder einstückig mit diesem ausgebildet.In the illustrated embodiment of the screw 1, the pitch of the guide grooves 1.1, 1.2 over the entire length of the screw is constant. The sliders 2.1, 2.2 are rigidly attached to the forks of the coupling element 2 or formed integrally therewith.

Denkbar ist auch eine Ausführung, bei der die Steigung der Führungsnuten 1.1 und 1.2 über die Länge der Schraubenspindel 1 veränderlich ist. Dadurch lassen sich bestimmte Steuereigenschaften der Greiferstangen 3 einstellen. In diesem nicht dargestellten Fall müssten die Gleitstücke 2.1, 2.2 beweglich an dem Kuppelglied 2 befestigt sein.Also conceivable is an embodiment in which the pitch of the guide grooves 1.1 and 1.2 over the length of the screw 1 is variable. As a result, certain control properties of the gripper bars 3 can be adjusted. In this case, not shown, the sliders should be 2.1, 2.2 movably mounted on the coupling element 2.

Die Gleitstücke 2.1, 2.2 wirken als Kulissensteine, wenn die Schraubenspindel 1 gedreht wird. Um die durch die Drehbewegung der Schraubenspindel 1 bewirkte Antriebskraft in Richtung der Mittelachse 1.3 auch bei dem erforderlichen Wechsel in der Drehrichtung der Schraubenspindel 1 spielfrei zu übertragen, müssen die Gleitstücke 2.1, 2.2 die Breite der Führungsnuten 1.1, 1.2 vollständig ausfüllen, ohne die Gleiteigenschaft zu beeinträchtigen. Ein nicht dargestelltes zylinderförmiges Gleitstück, dessen Mittelachse radial zur Mittelachse 1.3 der Schraubenspindel 1 verlaufen würde, muss somit einen Außendurchmesser von nahezu der Breite der Führungsnuten 1.1, 1.2 haben.The sliders 2.1, 2.2 act as sliding blocks when the screw 1 is rotated. In order to transfer the caused by the rotational movement of the screw 1 driving force in the direction of the central axis 1.3 even with the required change in the direction of rotation of the screw 1, the slides 2.1, 2.2, the width of the guide grooves 1.1, 1.2 completely fill, without the sliding property affect. An unillustrated cylindrical slider, whose central axis would run radially to the central axis 1.3 of the screw 1, must therefore have an outer diameter of almost the width of the guide grooves 1.1, 1.2.

Die Greiferstange 3 ist in einer geschlitzten Schiene 4 in ihrer Längsrichtung gleitend geführt. In dem Schlitz der geschlitzten Schiene 4 ist auch das Kuppelglied 2 mit dem zapfenförmigen Fortsatz 2.3 gleitend geführt.The gripper bar 3 is slidably guided in a slotted rail 4 in its longitudinal direction. In the slot of the slotted rail 4 and the coupling element 2 with the peg-shaped extension 2.3 is slidably guided.

Die Schraubenspindel 1 wird über ein Stirnradgetriebe 5 in Drehung versetzt, das aus einem Antriebsritzel 5.1 und einem Antriebszahnrad 5.2 besteht. Die geschlitzte Schiene 4 kann auch noch weitere Führungsteile aufweisen, die z.B. seitlich angeordnet sind, oder einen die Greiferstange 3 übergreifenden Bügel, der verhindert, dass die Greiferstange 3 nach oben ausbricht.The screw 1 is rotated by a spur gear 5 in rotation, which consists of a drive gear 5.1 and a drive gear 5.2. The slotted rail 4 may also have other guide parts, e.g. are arranged laterally, or a gripper bar 3 cross-strap, which prevents the gripper bar 3 breaks up.

Figur 2 zeigt, dass die Greiferstange 3 einen Querschnitt aus einem rechteckigen Hohlprofil hat. Da die beim Stand der Technik übliche Verzahnung entfällt, kann die Greiferstange 3 unter den Gesichtspunkten optimaler Stabilität und möglichst geringen Gewichtes funktionstüchtig gestaltet werden. Der in der dargestellten Ausführung sichtbare Rechteckquerschnitt des Hohlprofils weist beispielsweise ein deutlich höheres Widerstandsmoment gegen Biegung und Torsion auf als das bei verzahnten Greiferstangen häufig verwendete U-Profil. Diese Gestaltung bietet die Möglichkeit der Leichtbauweise in Verbindung mit hoher Stabilität. Trotz der besonders hohen Beschleunigungen der Greiferstange 3, die insbesondere bei breiten Webmaschinen auftreten, können dadurch die Belastungen des gesamten Antriebssystems und die erforderliche Antriebsleistung begrenzt werden. FIG. 2 shows that the gripper bar 3 has a cross section of a rectangular hollow profile. Since the customary in the prior art toothing is eliminated, the rapier 3 can be designed to work under the aspects of optimal stability and the lowest possible weight. The visible in the illustrated embodiment rectangular cross section of the hollow profile has, for example, a significantly higher resistance to bending and torsion than the U-profile often used in toothed rapiers. This design offers the possibility of lightweight construction in conjunction with high stability. Despite the particularly high accelerations of the rapier 3, which occur in particular in wide weaving machines, thereby the loads of the entire drive system and the required drive power can be limited.

Die Schraubenspindel 1 wird von einem Gehäuse 8 umschlossen und bildet zusammen mit der geschlitzten Führungsschiene 4 eine bauliche Einheit.The screw 1 is enclosed by a housing 8 and forms together with the slotted guide rail 4 a structural unit.

Im laufenden Betrieb wird die Schraubenspindel 1 über das Stirnradgetriebe 5 in eine hin- und hergehende Drehbewegung angetrieben. Die Schraubenspindel 1 ist dabei gegen eine Längsverschiebung zuverlässig gesichert. Die als Kulissensteine wirkenden Gleitstücke 2.1, 2.2 erteilen deshalb dem Kuppelglied 2 eine Längsbewegung in Richtung der Mittelachse 1.3 der Schraubenspindel 1. Diese wird auf die Greiferstange 3 übertragen, weil das Kuppelglied 2 mit der Greiferstange 3 fest verbunden ist. Die Greiferstange 3 führt deshalb infolge ihrer Führung in der geschlitzten Schiene 4 eine genau zu steuernde lineare Hin- und Herbewegung in ihrer Längsrichtung aus. Mit dem Richtungspfeil 6 in Figur 1 ist dabei die lineare Bewegung der Greiferstange 3 angedeutet, während die Drehrichtungspfeile 7 die wechselnde Drehrichtung der Schraubenspindel 1 verdeutlichen.During operation, the screw 1 is driven via the spur gear 5 in a reciprocating rotary motion. The screw 1 is reliably secured against longitudinal displacement. The slides acting as sliding blocks 2.1, 2.2 therefore give the coupling element 2 a longitudinal movement in the direction of the central axis 1.3 of the screw 1. This is transmitted to the gripper bar 3, because the coupling element 2 is firmly connected to the gripper bar 3. Therefore, the gripper bar 3 performs due to their leadership in the slotted rail 4 a precisely controlled linear reciprocating motion in its longitudinal direction. With the direction arrow 6 in FIG. 1 is the linear movement of the gripper bar 3 indicated, while the direction of rotation arrows 7 illustrate the changing direction of rotation of the screw 1.

Claims (15)

  1. A gripper bar drive of a mechanical loom, wherein a driving element driven in rotation in a reversing manner provides the gripper bar with a reciprocating movement in the longitudinal direction thereof, characterized by a screw mechanism with a screw spindle (1) as a driving element and with an anti-rotationally arranged coupling member (2) engaging the thread of the screw spindle (1) and being connected to the gripper bar (3).
  2. The gripper bar drive according to claim 1, characterized in that the screw spindle (1) and the gripper bar (3) are arranged in parallel to each other and that the coupling member (2) is located at the end of the gripper bar (3) opposite the gripper (3.1).
  3. The gripper bar drive according to any of the preceding claims, characterized by a thread pitch varying over the length of the screw spindle.
  4. The gripper bar drive according to any of the preceding claims, characterized in that the thread of the screw spindle (1) is a motion screw thread the turns of which constitute guiding grooves (1.1, 1.2), into which sliders (2.1, 2.2) of the coupling member (2) engage.
  5. The gripper bar drive according to claim 4, characterized in that the sliders (2.1, 2.2) are integral with the coupling member (2).
  6. The gripper bar drive according to claim 4, characterized by mobile fastening of the sliders (2.1, 2.2) to the coupling member (2).
  7. The gripper bar drive according to claim 6, characterized by sliders made as rolling bearings, wherein the outer rings of the rolling bearings roll on the flanks of the guiding grooves.
  8. The gripper bar drive according to claim 1 or 2, characterized in that the coupling member is made as a nut, the internal thread of which cooperates with the thread of the screw spindle.
  9. The gripper bar drive according to claim 8, characterized in that the nut is made as a ball screw nut, and balls as sliders are guided in the ball screw-shaped guiding grooves of the screw spindle.
  10. The gripper bar drive according to any of claims 4 to 7, with a double-threaded motion screw thread formed by the guiding grooves, characterized in that the coupling member (2) is made as a two-pronged fork enclosing the threaded spindle (1) starting from the gripper bar (3), and in that at the ends of each fork prong a slider (2.1, 2.2) is arranged, so that respectively one slider (2.1, 2.2) engages in respectively one of the turns and both sliders (2.1, 2.2) are located opposite each other.
  11. The gripper bar drive according to any of the preceding claims, characterized in that the reversing rotation of the screw spindle (1) is derived from the main shaft of the mechanical loom via an intermediate gear (5).
  12. The gripper bar drive according to any of claims 1 to 10, characterized in that the reversing rotation of the screw spindle is derived from a self-drive for the gripper bar directly or via an intermediate gear.
  13. The gripper bar drive according to claim 12, characterized in that the self-drive is performed by an electric servomotor.
  14. The gripper bar drive according to any of the preceding claims, characterized in that the gripper bar (3) is guided slidingly on a slotted rail (4), forming a constructional unit together with a case (8) enclosing the screw spindle (1).
  15. A mechanical loom with a gripper system for picking weft yarn, characterized by a gripper bar drive according to any of the preceding claims.
EP07722068A 2006-04-07 2007-03-21 Gripper-bar drive of a weaving machine, and weaving machine having a gripper system Not-in-force EP2004893B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006016873A DE102006016873B3 (en) 2006-04-07 2006-04-07 Gripper rod drive for weft insertion gripper in loom, comprises screw drive with screw spindle as driving member and rotationally fixed coupling member gripping screw spindle thread
PCT/DE2007/000508 WO2007115521A1 (en) 2006-04-07 2007-03-21 Gripper-bar drive of a weaving machine, and weaving machine having a gripper system

Publications (2)

Publication Number Publication Date
EP2004893A1 EP2004893A1 (en) 2008-12-24
EP2004893B1 true EP2004893B1 (en) 2010-09-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07722068A Not-in-force EP2004893B1 (en) 2006-04-07 2007-03-21 Gripper-bar drive of a weaving machine, and weaving machine having a gripper system

Country Status (5)

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EP (1) EP2004893B1 (en)
CN (1) CN101415869B (en)
AT (1) ATE483049T1 (en)
DE (2) DE102006016873B3 (en)
WO (1) WO2007115521A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102634911B (en) * 2012-04-06 2014-03-26 经纬纺织机械股份有限公司 Automatic shed seeking device and weaving machine with same
ITUB20150830A1 (en) * 2015-05-22 2016-11-22 Itema Spa Improved mechanism for controlling the reciprocating movement of the weft transport grippers in a textile loom
CN105798335B (en) * 2016-06-01 2018-02-06 上海昭程整流子科技有限公司 Slot-cutting machine mainshaft mechanism
CN108035053B (en) * 2017-12-11 2021-03-12 南京玻璃纤维研究设计院有限公司 Weft insertion device and weft insertion method for multilayer woven preform

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT44556B (en) * 1909-03-30 1910-10-25 Konrad Hopferwieser Wind chest for musical instruments.
IT1281187B1 (en) * 1992-10-23 1998-02-17 Inter Patent Limited DEVICE FOR DRIVING THE CLAMP HOLDER BELTS FOR WEAVING MACHINES
CN2175770Y (en) * 1993-10-28 1994-08-31 益进机械工业股份有限公司 Shuffling device of variable guide-length screw-driven wefting mechanism
DE19538287C1 (en) * 1995-10-14 1997-06-19 Dornier Gmbh Lindauer Loom with coolable rapier drive
CN2267260Y (en) * 1996-11-18 1997-11-12 林林波 Device for controlling weft insertion drive for shuttleless loom
DE10137183A1 (en) * 2001-07-31 2003-02-20 Staeubli Gmbh Drive device for working elements on weaving machines

Also Published As

Publication number Publication date
ATE483049T1 (en) 2010-10-15
DE502007005203D1 (en) 2010-11-11
CN101415869B (en) 2011-04-20
EP2004893A1 (en) 2008-12-24
CN101415869A (en) 2009-04-22
WO2007115521A1 (en) 2007-10-18
DE102006016873B3 (en) 2007-08-02

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