EP0246182B1 - Weft-storing device for looms - Google Patents

Weft-storing device for looms Download PDF

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Publication number
EP0246182B1
EP0246182B1 EP87810155A EP87810155A EP0246182B1 EP 0246182 B1 EP0246182 B1 EP 0246182B1 EP 87810155 A EP87810155 A EP 87810155A EP 87810155 A EP87810155 A EP 87810155A EP 0246182 B1 EP0246182 B1 EP 0246182B1
Authority
EP
European Patent Office
Prior art keywords
drum
braking
accumulator
weft
brake element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87810155A
Other languages
German (de)
French (fr)
Other versions
EP0246182A1 (en
Inventor
Rolf Benz
John Dalton Griffith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sulzer AG
Original Assignee
Gebrueder Sulzer AG
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Filing date
Publication date
Application filed by Gebrueder Sulzer AG filed Critical Gebrueder Sulzer AG
Publication of EP0246182A1 publication Critical patent/EP0246182A1/en
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Classifications

    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/364—Yarn braking means acting on the drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/22—Co-operating surfaces mounted for relative movement and arranged to apply pressure to material
    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/364—Yarn braking means acting on the drum
    • D03D47/366—Conical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2555/00—Actuating means
    • B65H2555/10—Actuating means linear
    • B65H2555/13—Actuating means linear magnetic, e.g. induction motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2555/00—Actuating means
    • B65H2555/20—Actuating means angular
    • B65H2555/23—Actuating means angular magnetic, e.g. rotary solenoids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a weft store for weaving machines, to which thread is fed from a supply spool and from which thread is drawn discontinuously for entry into the shed of a weaving machine, with a drum for storing a supply of weft threads and with a braking device consisting of a rotationally symmetrical braking surface, at least an elastically deformable braking member adjustable against the braking surface and a controllable adjusting device for the braking member relative to the braking surface.
  • German patent specification 2 253 259 such a braking device on a weft thread store is described, which is formed from a ring with an elastic insert, which is axially adjustable against the drum of the weft thread store.
  • the brake disc is shifted against the drum by an angle lever via a cam drive, the kinetic energy of the disc being destroyed when it hits the circumference of the drum. The resulting impact is mitigated by the elastic insert, but the weft thread between the drum circumference and the brake disc is pinched gently.
  • Alignment errors between the axes of the drum and the brake disc can be compensated for by the elastic insert, but surface pressures of different strengths occur in the contact zone, as a result of which the weft thread is braked to different extents depending on the position on the circumference of the drum. This allows the weft thread lengths to vary from one weft to another.
  • the invention which achieves the above object, is characterized in that the adjusting device is directly linked to the action of the braking element with elastic, low-mass parts of the braking member that cling to the circumference of the braking surface.
  • the braking member can consist of a plurality of rod-like disks lying next to one another on the outer drum circumference, which are pressed against the drum circumference, for example, by the action of a magnetic field.
  • the slats can be articulated or rigidly attached to a ring surrounding the drum at one end and lie against the drum circumference under the action of magnetic forces, the weft thread being trapped between the slats and the drum and being delayed to a standstill.
  • the disk-like braking elements can also be integrated into the circumference of the drum.
  • the braking element can also be formed by a single wire loop enclosing the drum circumference, which is contracted when the braking process is initiated, whereby it rests on the entire drum circumference.
  • the braking elements As far as the braking elements can come into contact with the drum circumference, they are designed to be flexible so that they lie evenly firmly on the drum circumference.
  • the effect of the braking device can be finely dosed by the described embodiments, so that the weft thread can be braked gently at the end of the weft insertion.
  • the weft thread storage device 1 is supplied with the weft thread 21 from the thread spool 2 through a bore in the winder axis 11 and the winder arm 111. It is first placed in several loops on the left part of the drum 10 and then wound up on the right part of the drum 10 in FIG. 1 by a second winding arm 112.
  • the braking device 13 surrounds the thread take-off end of the drum 10 with an annular magnet 131 and low-mass braking members 132, which are arranged on the circumference of the drum on the annular magnet 131 and, when the magnet is excited, with their ends facing the axis of the drum on the right-hand conical drum circumference, the braking surface 103.
  • the thread 21 is clamped between the braking surface 103 and the braking members 132 and decelerated to a standstill.
  • the drum 10 is supported by a bearing 12 in the winder axis 11 and secured against rotation by known means, not shown.
  • the winder axis 11 is driven via the drive belt 31 by a controllable drive motor 3, which is connected to the controller 4 via a control line 45.
  • the motor speed is set at the beginning of the weaving process to a value corresponding to the selected speed of the machine and the width of the fabric 6. If the thread length delivered by the winder arm 111 or 112 per work cycle of the weaving machine is as large as the thread length required per weft, the winding condition of the drum 10 will not change from one weft to the other. If too little thread supply is supplied by the winder arms 111 and 112, this is indicated by a thread supply sensor 84 via a control line 48 Control 4 reported, whereupon the speed of the winder axis 11 is increased.
  • the length of the weft thread inserted by means of the main nozzle 5 is determined by the time interval between the opening of the braking device 13 and the subsequent closing.
  • the time at which the braking device 13 is opened and closed is coordinated with the respective state of the weaving machine via an angle disk 71 on the main shaft of the weaving machine 7, the angle sensor 85, the control line 47 and the control 4. While the release of the braking device and thus the release of the weft can be determined at a specific position of the angle disk 71 relative to the angle sensor 85, the time of the closing process of the braking device depends on whether the weft thread tip 22 reaches the monitoring path along the weft thread monitoring 8 to a greater or lesser extent.
  • the opening interval of the braking device can be extended somewhat for the following weft, so that the weft thread on the weaving machine side does not become too short. Conversely, the opening interval of the braking device 13 is shortened if the weft thread tip comes to a standstill close to the sensor 83.
  • the control processes described are controlled by the controller 4, which is connected to the thread sensors 81-83 by means of the control lines 41-43 and to the magnet 131 by the control line 46.
  • Fig. 2 shows on an enlarged scale compared to Fig. 1 schematically the structure of the braking device 13.
  • the magnet 131 is arranged in the form of a ring. It carries the brake members 132 articulated at 133, which are arranged closely next to one another on the entire ring circumference. They are in the position 132 ′ during the opening time of the braking device 13 and thus leave a space between the braking surface 103 and through which the weft thread 21 can run through the eyelet 14 in the direction of the main nozzle 5.
  • the magnet 131 is energized, the parts of the braking members 132 close to it are pulled towards it, whereby the braking process is initiated.
  • the braking members 132 Due to the low-mass design of the braking members 132 inertial forces of the moving parts remain largely switched off during the braking process, so that the braking force can be finely regulated with the current in the control line 46. The braking force can thus be matched to the weft yarn to be entered.
  • FIG. 3 shows an embodiment of the braking device 13, in which the braking members 132 are integrated in the drum circumference and can be pulled against the magnetic ring 131 surrounding them, as a result of which the space for thread passage is reduced.
  • the braking members 132 are oriented obliquely to the surface lines of the drum 10 so that the weft thread, which takes a curve according to the dash-dotted position 21 ′ against the drum circumference during the running, cannot get caught in the spaces between the braking members 132.
  • the right-hand end of the drum 10 here forms a disk 102, around the edge of which the weft thread is deflected in the direction of the eyelet 14. When braking, the braking members move from position 132 'to position 132.
  • the braking member 132 being formed by a wire loop. As shown in FIG. 4, it can surround the circumference of the drum 10 in several turns.
  • the ends of the braking member 132 can be provided with magnet armatures 135, which can be shifted from the dash-dotted position to the extended position in FIG. 5 in a respective armature guide 136 by a magnet 131. If the magnetic force ceases to exist, the magnet armatures 135 can be retracted into the dashed position due to the elasticity of the braking member 132.
  • the magnet armatures 135 move parallel to the arrows 137.
  • guide rings 134 can be arranged which guide the wire loop 132 in the radial and axial directions. While a simple arrangement of a braking element 132 in the form of a wrap spring is shown in FIG. 7a, a double arrangement can be seen in FIG. 7b. The same applies to the effect of this embodiment with regard to a gentle and controlled braking process for the weft thread as described above for other embodiments of the braking device.

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

Description

Die Erfindung betrifft einen Schussfadenspeicher für Webmaschinen, dem von einer Vorratsspule Faden zugeführt wird und von dem diskontinuierlich Faden für den Eintrag in das Webfach einer Webmaschine abgezogen wird, mit einer Trommel zur Speicherung eines Schussfadenvorrats und mit einer Bremsvorrichtung, bestehend aus einer rotationssymmetrischen Bremsfläche, wenigstens einem gegen die Bremsfläche verstellbaren elastisch verformbaren Bremsorgan und einer steuerbaren Verstellvorrichtung für das Bremsorgan relativ zur Bremsfläche.The invention relates to a weft store for weaving machines, to which thread is fed from a supply spool and from which thread is drawn discontinuously for entry into the shed of a weaving machine, with a drum for storing a supply of weft threads and with a braking device consisting of a rotationally symmetrical braking surface, at least an elastically deformable braking member adjustable against the braking surface and a controllable adjusting device for the braking member relative to the braking surface.

In der deutschen Auslegeschrift 2 253 259 ist eine derartige Bremsvorrichtung an einem Schussfadenspeicher beschrieben, die aus einem Ring mit einer elastischen Einlage gebildet wird, der axial gegen die Trommel des Schussfadenspeichers verstellbar ist. Die Bremsscheibe wird von einem Winkelhebel über einen Nockentrieb gegen die Trommel verschoben, wobei die Bewegungsenergie der Scheibe beim Aufschlagen am Trommelumfang vernichtet wird. Der dabei auftretende Stoss wird zwar durch die elastische Einlage gemildert, jedoch wird der Schussfaden zwischen Trommelumfang und Bremsscheibe unsanft eingeklemmt. Fluchtungsfehler zwischen den Achsen der Trommel und der Bremsscheibe können durch die elastische Einlage ausgeglichen werden, wobei aber unterschiedlich starke Flächenpressungen in der Kontaktzone auftreten, wodurch der Schussfaden je nach Stellung am Umfang der Trommel unterschiedlich stark abgebremst wird. Dadurch können von einem Schuss zum anderen die Schussfadenlängen variieren.In German patent specification 2 253 259, such a braking device on a weft thread store is described, which is formed from a ring with an elastic insert, which is axially adjustable against the drum of the weft thread store. The brake disc is shifted against the drum by an angle lever via a cam drive, the kinetic energy of the disc being destroyed when it hits the circumference of the drum. The resulting impact is mitigated by the elastic insert, but the weft thread between the drum circumference and the brake disc is pinched gently. Alignment errors between the axes of the drum and the brake disc can be compensated for by the elastic insert, but surface pressures of different strengths occur in the contact zone, as a result of which the weft thread is braked to different extents depending on the position on the circumference of the drum. This allows the weft thread lengths to vary from one weft to another.

Es ist Aufgabe der vorliegenden Erfindung, einen Schussfadenspeicher zu schaffen, dessen Bremsvorrichtung den Schussfaden mit einer kontrollierbaren Flächenpressung an der Bremsstelle sanft abbremst, wobei an jeder Stelle der Bremse dieselben reproduzierbaren Bedingungen bei jedem Bremsvorgang bestehen.It is an object of the present invention to provide a weft thread store, the braking device of which gently brakes the weft thread with a controllable surface pressure at the braking point, the same reproducible conditions being present at every point of the brake with each braking operation.

Die Erfindung, welche die vorstehende Aufgabe löst, ist dadurch gekennzeichnet, dass die Verstellvorrichtung direkt mit elastischen massenarmen, sich an den Umfang der Bremsfläche anschmiegenden Teilen des Bremsorgans wirkungsverbunden ist. Das Bremsorgan kann aus einer Mehrzahl stabartiger nebeneinander am äusseren Trommelumfang liegender Lamellen bestehen, die beispielsweise durch die Wirkung eines Magnetfeldes an den Trommelumfang gedrückt werden. Die Lamellen können an einem die Trommel umgebenden Ring an ihrem einen Ende gelenkig oder starr befestigt sein und legen sich unter der Wirkung magnetischer Kräfte an den Trommelumfang an, wobei der Schussfaden beim Ablauf zwischen Lamellen und Trommel eingeklemmt und bis zum Stillstand verzögert werden kann. Die lamellenartigen Bremsorgane können auch in den Umfang der Trommel integriert sein. Beim Bremsvorgang werden sie dann gegen die Innenseite eines die Trommel umgebenden Ringes gedrückt. Das Bremsorgan kann auch durch eine einzige den Trommelumfang umschliessende Drahtschlinge gebildet werden, welche bei der Einleitung des Bremsvorganges zusammengezogen wird, wobei sie auf dem ganzen Trommelumfang aufliegt.The invention, which achieves the above object, is characterized in that the adjusting device is directly linked to the action of the braking element with elastic, low-mass parts of the braking member that cling to the circumference of the braking surface. The braking member can consist of a plurality of rod-like disks lying next to one another on the outer drum circumference, which are pressed against the drum circumference, for example, by the action of a magnetic field. The slats can be articulated or rigidly attached to a ring surrounding the drum at one end and lie against the drum circumference under the action of magnetic forces, the weft thread being trapped between the slats and the drum and being delayed to a standstill. The disk-like braking elements can also be integrated into the circumference of the drum. When braking, they are then pressed against the inside of a ring surrounding the drum. The braking element can also be formed by a single wire loop enclosing the drum circumference, which is contracted when the braking process is initiated, whereby it rests on the entire drum circumference.

Soweit die Bremsorgane mit dem Trommelumfang in Berührung kommen können, sind sie biegeweich ausgeführt, damit sie am Trommelumfang gleichmässig fest aufliegen.As far as the braking elements can come into contact with the drum circumference, they are designed to be flexible so that they lie evenly firmly on the drum circumference.

Durch die beschriebenen Ausführungsformen kann die Wirkung der Bremsvorrichtung fein dosiert werden, so dass ein schonendes Abbremsen des Schussfadens am Ende des Schusseintrages möglich ist.The effect of the braking device can be finely dosed by the described embodiments, so that the weft thread can be braked gently at the end of the weft insertion.

Im folgenden wird die Erfindung anhand der Figuren im einzelnen beschrieben.

  • Fig. 1 gibt eine Übersicht über den gesamten Lauf des Schussfaden u.a. durch den Schussfadenspeicher während des Webvorgangs,
  • Fig. 2 und Fig. 3 zeigen zwei Ausführungsarten gemäss der Erfindung in einer Seitenansicht senkrecht zur Trommelachse,
  • Fig. 4 zeigt eine weitere Ausführungsart der Erfindung in der gleichen Ansicht,
  • Fig. 5 stellt einen Querschnitt durch die Anordnung gemäss Fig. 4 nach Linie V-V dar,
  • Fig. 6 ist ein Meridianschnitt durch die Trommel und die Bremsvorrichtung mit einem umgebenden Stützring der Ausführung nach Fig. 4,
  • Fig. 7a und 7b zeigen zwei Ausführungsarten nach Fig. 4 in perspektivischer Darstellung.
The invention is described in detail below with reference to the figures.
  • 1 gives an overview of the entire course of the weft thread, inter alia through the weft thread store during the weaving process,
  • 2 and 3 show two embodiments according to the invention in a side view perpendicular to the drum axis,
  • 4 shows a further embodiment of the invention in the same view,
  • 5 shows a cross section through the arrangement according to FIG. 4 along line VV,
  • 6 is a meridian section through the drum and the braking device with a surrounding support ring of the embodiment according to FIG. 4,
  • 7a and 7b show two embodiments according to FIG. 4 in a perspective view.

Dem Schussfadenspeicher 1 wird der Schussfaden 21 von der Fadenspule 2 durch eine Bohrung in der Wicklerachse 11 und dem Wicklerarm 111 zugeführt. Er wird zunächst auf dem linken Teil der Trommel 10 in mehreren Schlaufen abgelegt und sodann durch einen zweiten Wickelarm 112 auf den rechten Teil der Trommel 10 in Fig. 1 aufgewickelt. Die Bremsvorrichtung 13 umgibt das fadenabzugsseitige Ende der Trommel 10 mit einem ringförmigen Magnet 131 und massenarmen Bremsorganen 132, die am Umfang der Trommel auf dem ringförmigen Magnet 131 angeordnet sind und bei Erregung des Magneten mit ihren der Achse der Trommel zugewandten Enden am rechten konischen Trommelumfang, der Bremsfläche 103, aufliegen. Am Ende des Schusseintrages zwischen die Kettfäden 61 wird der Faden 21 so zwischen der Bremsfläche 103 und den Bremsorganen 132 eingeklemmt und bis zum Stillstand verzögert. Beim gezeigten Ausführungsbeispiel ist die Trommel 10 über eine Lagerung 12 in der Wicklerachse 11 gelagert und durch nicht dargestellte bekannte Mittel gegen Verdrehung gesichert.The weft thread storage device 1 is supplied with the weft thread 21 from the thread spool 2 through a bore in the winder axis 11 and the winder arm 111. It is first placed in several loops on the left part of the drum 10 and then wound up on the right part of the drum 10 in FIG. 1 by a second winding arm 112. The braking device 13 surrounds the thread take-off end of the drum 10 with an annular magnet 131 and low-mass braking members 132, which are arranged on the circumference of the drum on the annular magnet 131 and, when the magnet is excited, with their ends facing the axis of the drum on the right-hand conical drum circumference, the braking surface 103. At the end of the weft insertion between the warp threads 61, the thread 21 is clamped between the braking surface 103 and the braking members 132 and decelerated to a standstill. In the embodiment shown, the drum 10 is supported by a bearing 12 in the winder axis 11 and secured against rotation by known means, not shown.

Die Wicklerachse 11 wird über den Antriebsriemen 31 von einem steuerbaren Antriebsmotor 3 angetrieben, der über eine Steuerleitung 45 mit der Steuerung 4 verbunden ist. Die Motordrehzahl wird zu Beginn des Webvorganges auf einen der gewählten Drehzahl der Maschine und der Breite des Gewebes 6 entsprechenden Wert eingestellt. Sofern die vom Wicklerarm 111 bzw. 112 gelieferte Fadenlänge pro Arbeitszyklus der Webmaschine so gross ist wie die pro Schuss benötigte Fadenlänge, wird sich der Bewicklungszustand der Trommel 10 von einem Schuss zum anderen nicht ändern. Falls von den Wicklerarmen 111 und 112 zu wenig Fadenvorrat nachgeliefert wird, wird dies durch einen Fadenvorratssensor 84 über eine Steuerleitung 48 an die Steuerung 4 gemeldet, worauf die Drehzahl der Wicklerachse 11 erhöht wird. Die Länge des mittels der Hauptdüse 5 eingetragenen Schussfadens wird durch den Zeitintervall zwischen Öffnen der Bremsvorrichtung 13 und nachfolgendem Schliessen bestimmt. Der Zeitpunkt des Öffnens und Schliessens der Bremsvorrichtung 13 wird über eine Winkelscheibe 71 auf der Hauptwelle der Webmaschine 7, den Winkelsensor 85, die Steuerleitung 47 und die Steuerung 4 mit dem jeweiligen Zustand der Webmaschine koordiniert. Während das Lüften der Bremsvorrichtung und damit die Schussfreigabe bei einer bestimmten Stellung der Winkelscheibe 71 zum Winkelsensor 85 festgelegt werden kann, richtet sich der Zeitpunkt des Schliessvorgangs der Bremsvorrichtung danach, ob die Schussfadenspitze 22 mehr oder weniger weit in die Überwachungsstrecke entlang der Schussfadenüberwachung 8 gelangt. Bleibt bei einem Schuss die Schussfadenspitze 22 nahe beim Fadensensor 81 stehen, so kann für die folgenden Schüsse das Öffnungsintervall der Bremsvorrichtung etwas verlängert werden, damit die Schussfäden fangseitig der Webmaschine nicht zu kurz werden. Umgekehrt wird das Öffnungsintervall der Bremsvorrichtung 13 verkürzt, wenn die Schussfadenspitze zu nahe beim Sensor 83 zum Stehen kommt. Die beschriebenen Regelungsvorgänge werden durch die Steuerung 4 kontrolliert, weiche mit den Fadensensoren 81-83 mittels der Steuerleitungen 41-43 und mit dem Magnet 131 durch die Steuerleitung 46 verbunden ist.The winder axis 11 is driven via the drive belt 31 by a controllable drive motor 3, which is connected to the controller 4 via a control line 45. The motor speed is set at the beginning of the weaving process to a value corresponding to the selected speed of the machine and the width of the fabric 6. If the thread length delivered by the winder arm 111 or 112 per work cycle of the weaving machine is as large as the thread length required per weft, the winding condition of the drum 10 will not change from one weft to the other. If too little thread supply is supplied by the winder arms 111 and 112, this is indicated by a thread supply sensor 84 via a control line 48 Control 4 reported, whereupon the speed of the winder axis 11 is increased. The length of the weft thread inserted by means of the main nozzle 5 is determined by the time interval between the opening of the braking device 13 and the subsequent closing. The time at which the braking device 13 is opened and closed is coordinated with the respective state of the weaving machine via an angle disk 71 on the main shaft of the weaving machine 7, the angle sensor 85, the control line 47 and the control 4. While the release of the braking device and thus the release of the weft can be determined at a specific position of the angle disk 71 relative to the angle sensor 85, the time of the closing process of the braking device depends on whether the weft thread tip 22 reaches the monitoring path along the weft thread monitoring 8 to a greater or lesser extent. If the weft thread tip 22 remains close to the thread sensor 81 during a weft, the opening interval of the braking device can be extended somewhat for the following weft, so that the weft thread on the weaving machine side does not become too short. Conversely, the opening interval of the braking device 13 is shortened if the weft thread tip comes to a standstill close to the sensor 83. The control processes described are controlled by the controller 4, which is connected to the thread sensors 81-83 by means of the control lines 41-43 and to the magnet 131 by the control line 46.

Fig. 2 zeigt im vergrösserten Massstab gegenüber Fig. 1 schematisch den Aufbau der Bremsvorrichtung 13. Um die Trommel 10, auf der der Fadenvorrat 23 gespeichert ist, ist der Magnet 131 in Form eines Ringes angeordnet. Er trägt die bei 133 angelenkten Bremsorgane 132, die dicht nebeneinander am ganzen Ringumfang angeordnet sind. Sie befinden sich während der Öffnungszeit der Bremsvorrichtung 13 in der Stellung 132' und lassen so einen Zwischenraum zwischen der Bremsfläche 103 und sich, durch den der Schussfaden 21 durch die Öse 14 in Richtung auf die Hauptdüse 5 laufen kann. Wenn der Magnet 131 unter Strom gesetzt ist, werden die ihm naheliegenden Teile der Bremsorgane 132 an ihn herangezogen, wodurch der Bremsvorgang eingeleitet ist. Durch die massenarme Ausführung der Bremsorgane 132 bleiben während des Bremsvorganges Trägheitskräfte der bewegten Teile weitgehend ausgeschaltet, womit die Bremskraft mit der Stromstärke in der Steuerleitung 46 fein regulierbar ist. Die Bremskraft kann so auf das einzutragende Schussgarn abgestimmt werden.Fig. 2 shows on an enlarged scale compared to Fig. 1 schematically the structure of the braking device 13. Around the drum 10, on which the thread supply 23 is stored, the magnet 131 is arranged in the form of a ring. It carries the brake members 132 articulated at 133, which are arranged closely next to one another on the entire ring circumference. They are in the position 132 ′ during the opening time of the braking device 13 and thus leave a space between the braking surface 103 and through which the weft thread 21 can run through the eyelet 14 in the direction of the main nozzle 5. When the magnet 131 is energized, the parts of the braking members 132 close to it are pulled towards it, whereby the braking process is initiated. Due to the low-mass design of the braking members 132 inertial forces of the moving parts remain largely switched off during the braking process, so that the braking force can be finely regulated with the current in the control line 46. The braking force can thus be matched to the weft yarn to be entered.

In Fig. 3 ist eine Ausführungsart der Bremsvorrichtung 13 gezeigt, bei der die Bremsorgane 132 in den Trommelumfang integriert sind und gegen den sie umgebenden Magnetring 131 gezogen werden können, wodurch der Zwischenraum für den Fadendurchtritt verkleinert wird. Die Bremsorgane 132 sind schräg zu den Mantellinien der Trommel 10 orientiert, damit der Schussfaden, der während des Ablaufens eine Kurve gemäss strichpunktierter Lage 21' gegen den Trommelumfang einnimmt, sich nicht in den Zwischenräumen zwischen den Bremsorganen 132 verfangen kann. Den rechtsseitigen Abschluss derTrommel 10 bildet hier eine Scheibe 102, um deren Rand der Schussfaden in Richtung auf die Öse 14 umgelenkt wird. Beim Bremsen gehen die Bremsorgane von Stellung 132' in die Stellung 132 über.3 shows an embodiment of the braking device 13, in which the braking members 132 are integrated in the drum circumference and can be pulled against the magnetic ring 131 surrounding them, as a result of which the space for thread passage is reduced. The braking members 132 are oriented obliquely to the surface lines of the drum 10 so that the weft thread, which takes a curve according to the dash-dotted position 21 ′ against the drum circumference during the running, cannot get caught in the spaces between the braking members 132. The right-hand end of the drum 10 here forms a disk 102, around the edge of which the weft thread is deflected in the direction of the eyelet 14. When braking, the braking members move from position 132 'to position 132.

Die Fig. 4-7 illustrieren eine weitere Ausführungsart der Bremsvorrichtung gemäss der Erfindung, wobei das Bremsorgan 132 durch eine Drahtschleife gebildet wird. Sie kann wie in Fig. 4 gezeigt in mehreren Windungen den Umfang der Trommel 10 umgeben. Die Enden des Bremsorgans 132 können mit Magnetankern 135 versehen sein, die in jeweils einer Ankerführung 136 durch einen Magnet 131 von der strichpunktierten Lage in die ausgezogene Lage in Fig. 5 verschoben werden können. Bei Wegfall der Magnetkraft können die Magnetanker 135 aufgrund der Elastizität des Bremsorgans 132 in die gestrichelte Lage zurückgezogen werden. Die Magnetanker 135 bewegen sich parallel zu den Pfeilen 137. Damit ein konstanter Spalt zwischen der Trommel 10 und dem Bremsorgan 132 eingehalten wird, können Führungsringe 134 angeordnet werden, welche die Drahtschlinge 132 in radialer und axialer Richtung führen. Während in Fig. 7a eine einfache Anordnung eines Bremsorgans 132 in Form einer Schlingfeder gezeigt wird, ist in Fig. 7b eine zweifache Anordnung zu sehen. Für die Wirkung dieser Ausführung bezüglich eines schonenden und kontrollierten Abbremsvorgangs für den Schussfaden gilt dasselbe wie oben für andere Ausführungsformen der Bremsvorrichtung geschildert.4-7 illustrate a further embodiment of the braking device according to the invention, the braking member 132 being formed by a wire loop. As shown in FIG. 4, it can surround the circumference of the drum 10 in several turns. The ends of the braking member 132 can be provided with magnet armatures 135, which can be shifted from the dash-dotted position to the extended position in FIG. 5 in a respective armature guide 136 by a magnet 131. If the magnetic force ceases to exist, the magnet armatures 135 can be retracted into the dashed position due to the elasticity of the braking member 132. The magnet armatures 135 move parallel to the arrows 137. In order to maintain a constant gap between the drum 10 and the braking member 132, guide rings 134 can be arranged which guide the wire loop 132 in the radial and axial directions. While a simple arrangement of a braking element 132 in the form of a wrap spring is shown in FIG. 7a, a double arrangement can be seen in FIG. 7b. The same applies to the effect of this embodiment with regard to a gentle and controlled braking process for the weft thread as described above for other embodiments of the braking device.

Claims (5)

1. A weft yarn accumulator for looms, the accumulator being supplied with yarn (21) from a supply reel (2), yarn being drawn off the accumulator intermittently for picking into the shed of a loom, the accumulator comprising a drum (10) for storing a weft yarn supply (23) and a brake device (13) comprising a rotationally symmetrical braking surface (103), at least one resiliently deformable brake element (132) movable relatively to the braking surface (103) and controllable displacing means (131) for moving the brake element relatively to the braking surface, characterised in that the displacing means (131) are operatively connected to resilient low-weight parts of the brake element which engage intimately with the periphery of the braking surface.
2. An accumulator according to claim 1, characterised in that the resilient low-weight parts of the braking element (132) are in the form of a plurality of rod-like lamellae disposed one beside another on the outer periphery (10) of the drum.
3. An accumulator according to claim 1, characterised in that the displacing means (31) for displacing the brake element (132) take the form of an electromagnet.
4. An accumulator according to claims 1 and 2, characterised in that the lamellae (137) are unitary with the periphery of the drum (10) and an annular electromagnet (131) is disposed therearound near the lamellae (137).
5. An accumulator according to claim 1, characterised in that the brake element (132) is in the form of at least one loop which extends around the drum periphery.
EP87810155A 1986-05-15 1987-03-18 Weft-storing device for looms Expired - Lifetime EP0246182B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1977/86 1986-05-15
CH1977/86A CH669804A5 (en) 1986-05-15 1986-05-15

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EP0246182A1 EP0246182A1 (en) 1987-11-19
EP0246182B1 true EP0246182B1 (en) 1990-01-31

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EP87810155A Expired - Lifetime EP0246182B1 (en) 1986-05-15 1987-03-18 Weft-storing device for looms

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US (1) US4785855A (en)
EP (1) EP0246182B1 (en)
JP (1) JPS62276054A (en)
CH (1) CH669804A5 (en)
DE (1) DE3761573D1 (en)

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Also Published As

Publication number Publication date
EP0246182A1 (en) 1987-11-19
CH669804A5 (en) 1989-04-14
JPS62276054A (en) 1987-11-30
US4785855A (en) 1988-11-22
DE3761573D1 (en) 1990-03-08

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