EP0613970A1 - Weft yarn brake with controllable braking - Google Patents

Weft yarn brake with controllable braking Download PDF

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Publication number
EP0613970A1
EP0613970A1 EP93120354A EP93120354A EP0613970A1 EP 0613970 A1 EP0613970 A1 EP 0613970A1 EP 93120354 A EP93120354 A EP 93120354A EP 93120354 A EP93120354 A EP 93120354A EP 0613970 A1 EP0613970 A1 EP 0613970A1
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EP
European Patent Office
Prior art keywords
weft
thread
brake
parts
stepper motor
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.)
Withdrawn
Application number
EP93120354A
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German (de)
French (fr)
Inventor
Rainer Schuster
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.)
Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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Filing date
Publication date
Application filed by Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP0613970A1 publication Critical patent/EP0613970A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2551/00—Means for control to be used by operator; User interfaces
    • B65H2551/20—Display means; Information output means
    • B65H2551/21—Monitors; Displays
    • 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
    • B65H2555/00—Actuating means
    • B65H2555/20—Actuating means angular
    • B65H2555/24—Servomotors
    • 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 an improved weft brake with controllable braking action, in particular for defenseless weaving machines, consisting of two resiliently lying against each other and the weft thread between the receiving lamella-like parts, which act on the controllable means, the position of at least one of the two lamella-like parts relative to the other adjust.
  • Such weft brakes are used in defenseless weaving machines so that the weft insertion member can grip the selected weft in a tensioned or stretched state.
  • the entry elements for example the grippers which are pushed into the shed from both sides and withdrawn again, are subject to considerable accelerations and delays.
  • the thread is quickly brought to the center of the compartment by the grippers and is quickly removed from the spool.
  • the handover takes place to the gripper that is advanced from the opposite side.
  • the rapid thread take-off is interrupted for a short time. The thread is then quickly pulled through the shed by the receiving rapier and released at the end of the entry path, thereby stopping its speed.
  • the thread must remain taut for the entire time the weft is inserted and, for example, may not continue to run if the thread pull is briefly interrupted during thread transfer and, for example, may not form loops.
  • the above-mentioned weft brake is provided and in many cases designed such that it not only exerts a constant, uniform braking action on the thread, but also realizes a different braking action in different phases of the weft insertion.
  • a weft brake with stepwise controllable braking effect for defenseless weaving machines is known.
  • This weft brake consists of two resiliently laying against each other and the weft thread between the receiving plate-like parts, on which additionally individually and arbitrarily controllable means act.
  • the controllable means should be able to adjust at least one of the two lamella-like parts with respect to the other.
  • Electromagnetic means are provided as controllable means, for example, such as an armature piece resting on one lamella-like part and an electromagnet arranged on the other lamella-like part opposite.
  • the control of this thread brake does not allow the braking force acting on the weft thread to be set in a narrow tolerance.
  • this thread brake only allows two control options, namely the brake is electromagnetically loaded or it is not loaded.
  • a thread brake for weaving machines is known from EP 0 475 892 A1, according to which the weft thread is guided between a brake band and a brake body that can be moved in a controlled manner, and the brake body can be actuated by a servomotor connected to a control and logic circuit.
  • the rotary movement of the servomotor shaft is converted into a lifting movement of the brake body via a lever mechanism.
  • This thread brake is only able to either cancel or not cancel the braking effect, since a type of basic braking, as is possible with the disk-like brake parts according to DE-PS 34 46 567, is not given.
  • European patent application 0 524 429 also discloses a thread brake, in particular for use in the insertion of weft threads on weaving machines.
  • the thread brake consists of a motor-driven rotary shaft, which forms a recess on part of its circumference by reducing the cross-section, and of a resilient tab, which rests on the circumference of the shaft above the recess.
  • This reduction in cross section is intended to ensure that a weft thread with knots is also free to pass through the brake during the weft insertion.
  • the thread braking force becomes effective after the weft thread has been inserted in such a way that the recess is moved out of the passage area of the weft thread by motorized turning.
  • the weft is then between the peripheral surface of the shaft and the resilient tab on the shaft.
  • this thread brake also only allows two control options; either the weft is allowed to pass freely through the brake or the weft is clamped between the braking elements.
  • the object of the invention is therefore to develop a thread brake of the type mentioned in the preamble in such a way that the braking parameters, e.g. the braking force can be set within narrow limits and can be made reproducible.
  • the object is achieved in that the known weft brake, which consists of two resiliently lying against each other and the weft between them lamella-like parts is controlled by means of a disc magnet stepper motor.
  • a disc magnet stepper motor On the free end of the stepper motor shaft there is an eccentrically arranged and preferably rotationally symmetrical control element which is fixedly connected to the stepper motor shaft and is operatively connected to one of the lamella-like parts, and the stepper motor is connected to a programmable thread brake control in a signal-transmitting manner with regard to its active parameters.
  • Figure 1 shows a weft brake with lamellar leaf springs as a brake body.
  • a block 2 is arranged on a carrier or other machine part 1, in which two bolts 3, which can also be rotatable, are present.
  • the bolts 3 serve as a holder for the lamella-like parts, ie for the two leaf springs 6a and 6b.
  • a holder 5 is provided for the thread guide eyes 4.
  • the weft thread 11 is pulled in the direction of the arrow through the thread guide eyes 4 and between the lamellar leaf springs 6a and 6b.
  • the leaf springs 6a and 6b are more or less strongly placed against one another or completely lifted from one another.
  • the desired basic level of braking action can be set.
  • the servomotor 7 is arranged fixed on the bracket 10, which is connected to the bracket 5 (Fig. 2).
  • the electrical lead of the servomotor 7 is indicated by 7a.
  • a preferably rotationally symmetrical control element 9 is connected eccentrically to the free end of the control motor shaft 8 of the control motor 7.
  • the adjusting element 9 is operatively connected to the outer surface of one of the leaf springs; here with the leaf spring 6a.
  • Figure 3 shows the block diagram of the thread brake control.
  • the parameters to be implemented by the thread brake are set on the dialog terminal 12 and transmitted to the thread brake control 13, which is designed as a microcontroller and is serially coupled to the weaving machine control 14.
  • the servomotor 7 receives the actuating signals from the thread brake control 13.
  • FIG. 4 shows the improved weft thread brake, where instead of the block 2 for receiving the bolts 3 and instead of the holder 5, the thread eyelets 4, the bolts 3 and the servomotor 7 are fastened together on a circuit board 15.
  • a pattern-oriented braking and releasing of the weft thread is advantageously achieved compared to the prior art.
  • the braking forces are set via menus on the weaving machine dialog terminal. No mechanical adjustments are therefore necessary.
  • the servomotor used is a disc magnet stepper motor, which has no magnetic coupling between the phases and due to the disc magnet rotor has extremely low moment of inertia. As a result, you can accelerate faster and slow down more.
  • the stepper motor has a step angle of 3.6 degrees, which results in a very high resolution of the stroke (50 steps at 180 degrees).
  • Another advantage of the invention is that the braking parameters of the thread brake, such as braking speed, can be synchronized with the acceleration of the weft insertion elements, for example the gripper. This means that the necessary thread tension is always present, ie not too low but also not too high, which in turn almost eliminates the risk of thread breakage.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)

Abstract

Der verbesserten Schußfadenbremse liegt die Aufgabe zugrunde, Bremsparameter wie z.B. die Bremskraft in engen Grenzen einstellbar und reproduzierbar zu gestalten. Erfindungsgemäß wird dies dadurch erreicht, indem ein Schrittmotor 7 und ein mit dem Motor verbundenes Mittel 9 steuernd auf wenigstens ein lamellenartiges Teil 6a,6b der aus zwei sich federnd gegeneinander legenden und den Schußfaden zwischen sich aufnehmenden lamellenartigen Teilen 6a,6b bestehenden Schußfadenbremse einwirkt. <IMAGE>The improved weft brake is based on the task of braking parameters such as to make the braking force adjustable and reproducible within narrow limits. According to the invention, this is achieved in that a stepping motor 7 and a means 9 connected to the motor act on at least one disc-like part 6a, 6b of the weft brake which consists of two disc-like parts 6a, 6b which resiliently lie against one another and receive the weft thread between them. <IMAGE>

Description

Die Erfindung betrifft eine verbesserte Schußfadenbremse mit steuerbarer Bremswirkung, insbesondere für schützenlose Webmaschinen, bestehend aus zwei sich federnd gegeneinander legenden und den Schußfaden zwischen sich aufnehmenden lamellenartigen Teilen, auf die die steuerbaren Mittel einwirken, die die Lage wenigstens eines der beiden lamellenartigen Teile gegenüber dem anderen verstellen.The invention relates to an improved weft brake with controllable braking action, in particular for defenseless weaving machines, consisting of two resiliently lying against each other and the weft thread between the receiving lamella-like parts, which act on the controllable means, the position of at least one of the two lamella-like parts relative to the other adjust.

Derartige Schußfadenbremsen werden bei schützenlosen Webmaschinen eingesetzt, damit das Schußfadeneintragsorgan den ausgewählten Schußfaden in gespanntem bzw. gestrecktem Zustand erfassen kann. Während des Schußeintrages sind die Eintragsorgane, z.B. die von beiden Seiten her in das Webfach vorgeschobenen und wieder zurückgezogenen Greifer erheblichen Beschleunigungen und Verzögerungen unterworfen. Nach seinem Erfassen wird der Faden von den Greifern rasch zur Fachmitte gebracht und dabei schnell von der Spule abgezogen. In der Fachmitte erfolgt die Übergabe an den von der Gegenseite her vorgeschobenen Greifer. Dabei wird für kurze Zeit der rasche Fadenabzug unterbrochen. Anschließend wird der Faden vom übernehmenden Greifer vollends schnell durch das Webfach gezogen und am Ende der Eintragsbahn freigegeben und dadurch in seiner Geschwindigkeit gestoppt. Über die ganze Zeit des Schußeintrages muß der Faden gespannt bleiben und darf z.B. beim kurzen Unterbrechen des Fadenabzuges während der Fadenübergabe nicht nachlaufen und z.B. keine Schlingen bilden. Um diese Forderung zu erfüllen, ist die o.g. Schußfadenbremse vorgesehen und vielfach so ausgebildet, daß sie nicht nur eine ständige gleichmäßige Bremswirkung auf den Faden ausübt, sondern in unterschiedlichen Phasen des Schußeintrages auch eine unterschiedlich starke Bremswirkung realisiert.Such weft brakes are used in defenseless weaving machines so that the weft insertion member can grip the selected weft in a tensioned or stretched state. During the weft insertion, the entry elements, for example the grippers which are pushed into the shed from both sides and withdrawn again, are subject to considerable accelerations and delays. After it has been grasped, the thread is quickly brought to the center of the compartment by the grippers and is quickly removed from the spool. In the middle of the compartment, the handover takes place to the gripper that is advanced from the opposite side. The rapid thread take-off is interrupted for a short time. The thread is then quickly pulled through the shed by the receiving rapier and released at the end of the entry path, thereby stopping its speed. The thread must remain taut for the entire time the weft is inserted and, for example, may not continue to run if the thread pull is briefly interrupted during thread transfer and, for example, may not form loops. In order to meet this requirement, the above-mentioned weft brake is provided and in many cases designed such that it not only exerts a constant, uniform braking action on the thread, but also realizes a different braking action in different phases of the weft insertion.

Aus der DE-PS 34 46 567 ist eine Schußfadenbremse mit stufenweise steuerbarer Bremswirkung für schützenlose Webmaschinen bekannt. Diese Schußfadenbremse besteht aus zwei sich federnd gegeneinander legenden und den Schußfaden zwischen sich aufnehmenden lamellenartigen Teilen, auf die zusätzlich individuell und willkürlich steuerbare Mittel einwirken. Dabei sollen die steuerbaren Mittel in der Lage sein, wenigstens eines der beiden lamellenartigen Teile gegenüber dem anderen zu verstellen.
Als steuerbare Mittel sind hier elektromagnetische Mittel vorgesehen, z.B. solche wie ein an dem einen lamellenartigen Teil anliegendes Ankerstück und diesem gegenüberliegend ein an dem anderen lamellenartigen Teil angeordneter Elektromagnet. Die Steuerung dieser Fadenbremse gestattet es nicht, die auf den Schußfaden wirkende Bremskraft in engen Toleranzen gestuft einzustellen. Die Einstellung der Bremskräfte auf eine Vielzahl exakt definierter Werte ist nicht möglich; damit ist auch eine Reproduzierbarkeit der Bremskräfte nahezu ausgeschlossen. Darüber hinaus besteht der Nachteil, daß diese Fadenbremse nur zwei Steuerungsmöglichkeiten zuläßt, nämlich die Bremse ist elektromagnetisch belastet oder sie ist nicht belastet.From DE-PS 34 46 567 a weft brake with stepwise controllable braking effect for defenseless weaving machines is known. This weft brake consists of two resiliently laying against each other and the weft thread between the receiving plate-like parts, on which additionally individually and arbitrarily controllable means act. The controllable means should be able to adjust at least one of the two lamella-like parts with respect to the other.
Electromagnetic means are provided as controllable means, for example, such as an armature piece resting on one lamella-like part and an electromagnet arranged on the other lamella-like part opposite. The control of this thread brake does not allow the braking force acting on the weft thread to be set in a narrow tolerance. It is not possible to set the braking forces to a large number of precisely defined values; this means that reproducibility of the braking forces is almost impossible. In addition, there is the disadvantage that this thread brake only allows two control options, namely the brake is electromagnetically loaded or it is not loaded.

Aus der EP 0 475 892 A1 ist eine Fadenbremse für Webmaschinen bekannt, wonach der Schußfaden zwischen einem Bremsband und einem gesteuert bewegbaren Bremskörper geführt ist und wobei der Bremskörper durch einen mit einer Ansteuer- und Logikschaltung verbundenen Stellmotor betätigbar ist.
Hier wird die Drehbewegung der Stellmotorwelle über eine Hebelmechanik in eine Hubbewegung des Bremskörpers umgesetzt. Diese Fadenbremse ist nur in der Lage die Bremswirkung entweder aufzuheben oder nicht aufzuheben, da eine Art Grundbremsung, wie sie mit den lamellenartig ausgebildeten Bremsteilen gemäß der DE-PS 34 46 567 möglich ist, nicht gegeben ist.A thread brake for weaving machines is known from EP 0 475 892 A1, according to which the weft thread is guided between a brake band and a brake body that can be moved in a controlled manner, and the brake body can be actuated by a servomotor connected to a control and logic circuit.
Here, the rotary movement of the servomotor shaft is converted into a lifting movement of the brake body via a lever mechanism. This thread brake is only able to either cancel or not cancel the braking effect, since a type of basic braking, as is possible with the disk-like brake parts according to DE-PS 34 46 567, is not given.

Ferner muß bei dieser Lösung die Bremskraft im geschlossenen Zustand der Bremse mechanisch eingestellt werden; die Einstellung kann während des Webmaschinenlaufes nicht mehr verändert werden.
Zur Positionierung des Stellmotors ist nach dem EP 0 475 892 ein Induktivsensor erforderlich.Furthermore, with this solution, the braking force in the closed state of the brake must be set mechanically; the setting can no longer be changed during the weaving machine run.
According to EP 0 475 892, an inductive sensor is required for positioning the servomotor.

Mit der europäischen Patentanmeldung 0 524 429 ist ferner eine Fadenbremse, insbesondere zum Einsatz bei Schußfadeneintrag auf Webmaschinen bekannt. Hier besteht die Fadenbremse aus einer motorisch drehangetriebenen Welle, die auf einem Teil ihres Umfangs durch Querschnittsreduzierung eine Ausnehmung ausbildet, und aus einer federnden Lasche, die am Umfang der Welle über der Ausnehmung anliegt.
Diese Querschnittsreduzierung soll dazu dienen, wahrend des Schußeintrages auch einen mit Knoten behafteten Schußfaden einen freien Durchgang durch die Bremse zu sichern.
Die Fadenbremskraft wird nach erfolgtem Schußfadeneintrag derart wirksam, daß die Ausnehmung aus dem Durchgangsbereich des Schußfadens durch motorisches Drehen herausbewegt wird. Der Schußfaden liegt dann zwischen der Umfangsfläche der Welle und der an der Welle anliegenden federnden Lasche.
Nachteilig ist, daß diese Fadenbremse ebenfalls nur zwei Steuerungsmöglichkeiten zuläßt; entweder dem Schußfaden wird ein freier Durchgang durch die Bremse ermöglicht oder der Schußfaden wird zwischen den Bremselementen geklemmt.European patent application 0 524 429 also discloses a thread brake, in particular for use in the insertion of weft threads on weaving machines. Here, the thread brake consists of a motor-driven rotary shaft, which forms a recess on part of its circumference by reducing the cross-section, and of a resilient tab, which rests on the circumference of the shaft above the recess.
This reduction in cross section is intended to ensure that a weft thread with knots is also free to pass through the brake during the weft insertion.
The thread braking force becomes effective after the weft thread has been inserted in such a way that the recess is moved out of the passage area of the weft thread by motorized turning. The weft is then between the peripheral surface of the shaft and the resilient tab on the shaft.
The disadvantage is that this thread brake also only allows two control options; either the weft is allowed to pass freely through the brake or the weft is clamped between the braking elements.

Aufgabe der Erfindung ist es daher, eine Fadenbremse der im Oberbegriff genannten Gattung derart weiterzubilden, daß die Bremsparameter, wie z.B. die Bremskraft in engen Grenzen einstellbar und reproduzierbar gestaltet werden können.The object of the invention is therefore to develop a thread brake of the type mentioned in the preamble in such a way that the braking parameters, e.g. the braking force can be set within narrow limits and can be made reproducible.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß die an sich bekannte Schußfadenbremse, die aus zwei sich federnd gegeneinander legenden und den Schußfaden zwischen sich aufnehmenden lamellenartigen Teilen besteht, mittels eines Scheibenmagnet-Schrittmotors gesteuert wird. Dabei ist auf dem freien Ende der Schrittmotorwelle ein exzentrisch angeordnetes und fest mit der Schrittmotorwelle verbundenes, vorzugsweise rotationssymmetrisch ausgebildetes Stellelement vorgesehen, das mit einem der lamellenartigen Teile in Wirkverbindung steht, und der Schrittmotor im Hinblick auf seine Wirkparameter signalübertragend mit einer programmierbaren Fadenbremssteuerung verbunden ist.
Weitere Merkmale und Vorteile der Erfindung gehen aus den Unteransprüchen und der Beschreibung hervor.According to the invention, the object is achieved in that the known weft brake, which consists of two resiliently lying against each other and the weft between them lamella-like parts is controlled by means of a disc magnet stepper motor. On the free end of the stepper motor shaft there is an eccentrically arranged and preferably rotationally symmetrical control element which is fixedly connected to the stepper motor shaft and is operatively connected to one of the lamella-like parts, and the stepper motor is connected to a programmable thread brake control in a signal-transmitting manner with regard to its active parameters.
Further features and advantages of the invention emerge from the subclaims and the description.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung erläutert. Es zeigen:

Fig. 1
die mittels Stellmotor betätigbare Schußfadenbremse in der Vorderansicht,
Fig. 2
die Schußfadenbremse gemäß Fig. 1 in der Draufsicht,
Fig. 3
das Blockschaltbild der Fadenbremssteuerung,
Fig. 4
die Schußfadenbremse in perspektivischer Darstellung.
An embodiment of the invention is explained below with reference to the drawing. Show it:
Fig. 1
the weft brake which can be actuated by means of a servomotor, in the front view,
Fig. 2
1 in top view,
Fig. 3
the block diagram of the thread brake control,
Fig. 4
the weft brake in perspective.

Figur 1 zeigt eine Schußfadenbremse mit lamellenartigen Blattfedern als Bremskörper.
Auf einem Träger oder sonstigen Maschinenteil 1 ist ein Block 2 angeordnet, in dem zwei Bolzen 3, die auch verdrehbar sein können, vorhanden sind. Die Bolzen 3 dienen als Halterung für die lamellenartigen Teile, d.h. für die beiden Blattfedern 6a und 6b.Figure 1 shows a weft brake with lamellar leaf springs as a brake body.
A block 2 is arranged on a carrier or other machine part 1, in which two bolts 3, which can also be rotatable, are present. The bolts 3 serve as a holder for the lamella-like parts, ie for the two leaf springs 6a and 6b.

Am Block 2 ist eine Halterung 5 für die Fadenführungsösen 4 vorgesehen. Der Schußfaden 11 wird in der eingezeichneten Pfeilrichtung durch die Fadenführungsösen 4 und zwischen den lamellenartigen Blattfedern 6a und 6b hindurchgezogen.At block 2, a holder 5 is provided for the thread guide eyes 4. The weft thread 11 is pulled in the direction of the arrow through the thread guide eyes 4 and between the lamellar leaf springs 6a and 6b.

Durch Verdrehen der Bolzen 3 werden die Blattfedern 6a und 6b mehr oder weniger stark aneinander gelegt bzw. voneinander ganz abgehoben. Auf diese Weise kann die gewünschte Grundstufe der Bremswirkung eingestellt werden.
In Figur 1 ist an der Halterung 10, die mit der Halterung 5 verbunden ist (Fig. 2), der Stellmotor 7 ortsfest angeordnet. Mit 7a ist die elektrische Zuleitung des Stellmotors 7 angedeutet. Mit dem freien Ende der Stellmotorwelle 8 des Stellmotors 7 ist ein vorzugsweise rotationssymmetrisch ausgebildetes Stellelement 9 exzentrisch verbunden. Das Verstellelement 9 steht mit der äußeren Fläche einer der Blattfedern in Wirkverbindung; hier mit der Blattfeder 6a.By turning the bolts 3, the leaf springs 6a and 6b are more or less strongly placed against one another or completely lifted from one another. In this way, the desired basic level of braking action can be set.
In Figure 1, the servomotor 7 is arranged fixed on the bracket 10, which is connected to the bracket 5 (Fig. 2). The electrical lead of the servomotor 7 is indicated by 7a. A preferably rotationally symmetrical control element 9 is connected eccentrically to the free end of the control motor shaft 8 of the control motor 7. The adjusting element 9 is operatively connected to the outer surface of one of the leaf springs; here with the leaf spring 6a.

Figur 3 zeigt das Blockschaltbild der Fadenbremssteuerung. Die von der Fadenbremse zu realisierenden Parameter werden an dem Dialogterminal 12 eingestellt und der als Microkontrollsteuerung ausgebildeten Fadenbremssteuerung 13, die seriell mit der Webmaschinensteuerung 14 gekoppelt ist, übermittelt. Der Stellmotor 7 erhält von der Fadenbremssteuerung 13 die Stellsignale.Figure 3 shows the block diagram of the thread brake control. The parameters to be implemented by the thread brake are set on the dialog terminal 12 and transmitted to the thread brake control 13, which is designed as a microcontroller and is serially coupled to the weaving machine control 14. The servomotor 7 receives the actuating signals from the thread brake control 13.

Figur 4 zeigt die verbesserte Schußfadenbremse, wo anstelle des Blockes 2 zur Aufnahme der Bolzen 3 und anstelle der Halterung 5 die Fadenösen 4, die Bolzen 3 und der Stellmotor 7 gemeinsam an einer Platine 15 befestigt sind.FIG. 4 shows the improved weft thread brake, where instead of the block 2 for receiving the bolts 3 and instead of the holder 5, the thread eyelets 4, the bolts 3 and the servomotor 7 are fastened together on a circuit board 15.

Mit der erfindungsgemäßen Lösung wird im Vergleich zum Stand der Technik in vorteilhafter Weise ein musterorientiertes Bremsen und Freigeben des Schußfadens erzielt. Das Einstellen der Bremskräfte erfolgt über Menüs am Webmaschinendialogterminal. Es sind daher keinerlei mechanische Einstellungen erforderlich.
Der zur Anwendung kommende Stellmotor ist ein Scheibenmagnet-Schrittmotor, der keine magnetische Koppelung zwischen den Phasen besitzt und aufgrund des Scheibenmagnet-Rotors ein extrem niedriges Trägheitsmoment aufweist. Das hat zur Folge, daß höher beschleunigt und stärker abgebremst werden kann. Außerdem weist der Schrittmotor einen Schrittwinkel von 3,6 Grad auf, was eine sehr hohe Auflösung des Hubes (50 Schritte bei 180 Grad) ergibt.
Ein weiterer Vorteil der Erfindung besteht darin, daß die Bremsparameter der Fadenbremse wie z.B. Bremsgeschwindigkeit mit der Beschleunigung der Schußfadeneintragsorgane z.B. der Greifer synchronisiert werden können. Damit ist immer die notwendige, d.h. keine zu niedrige aber auch keine zu hohe Fadenspannung vorhanden, was wiederum die Gefahr des Fadenreißens nahezu ausschließt.With the solution according to the invention, a pattern-oriented braking and releasing of the weft thread is advantageously achieved compared to the prior art. The braking forces are set via menus on the weaving machine dialog terminal. No mechanical adjustments are therefore necessary.
The servomotor used is a disc magnet stepper motor, which has no magnetic coupling between the phases and due to the disc magnet rotor has extremely low moment of inertia. As a result, you can accelerate faster and slow down more. In addition, the stepper motor has a step angle of 3.6 degrees, which results in a very high resolution of the stroke (50 steps at 180 degrees).
Another advantage of the invention is that the braking parameters of the thread brake, such as braking speed, can be synchronized with the acceleration of the weft insertion elements, for example the gripper. This means that the necessary thread tension is always present, ie not too low but also not too high, which in turn almost eliminates the risk of thread breakage.

ZEICHNUNGS-LEGENDEDRAWING LEGEND

11
MaschinenteilMachine part
22nd
Blockblock
33rd
Bolzenbolt
44th
FadenführungsöseThread guide eyelet
55
Halterungbracket
6a6a
BlattfederLeaf spring
6b6b
BlattfederLeaf spring
77
StellmotorServomotor
7a7a
ZuleitungSupply
88th
StellmotorwelleActuator shaft
99
StellelementActuator
1010th
Halterungbracket
1111
SchußfadenWeft
1212th
DialogterminalDialogue terminal
1313
FadenbremssteuerungThread brake control
1414
WebmaschinensteuerungWeaving machine control
1515
Platinecircuit board

Claims (4)

Verbesserte Schußfadenbremse mit steuerbarer Bremswirkung, insbesondere für schützenlose Webmaschinen, bestehend aus zwei sich federnd gegeneinander legenden und den Schußfaden zwischen sich aufnehmenden lamellenartigen Teilen, wobei auf wenigstens einem der Teile ein steuerbares Mittel einwirkt, das die Lage wenigstens eines der beiden lamellenartigen Teile gegenüber dem anderen verstellt, dadurch gekennzeichnet, daß das steuerbare Mittel ein Schrittmotor (7) ist, mit einem auf dem freien Ende der Schrittmotorwelle (8) exzentrisch angeordneten und fest mit der Schrittmotorwelle (8) verbundenen, vorzugsweise rotationssymmetrisch ausgebildeten Stellelement (9), das mit einem der lamellenartigen Teile (6a,6b) in Wirkverbindung steht und der Schrittmotor (8) im Hinblick auf seine Wirkparameter signalübertragend mit einer programmierbaren Fadenbremssteuerung (13) in Verbindung steht.Improved weft brake with controllable braking action, in particular for defenseless weaving machines, consisting of two resiliently opposing lamella-like parts and the weft thread between them, lamellar parts acting on at least one of the parts, a controllable means acting on at least one of the two lamellar parts relative to the other Adjusted, characterized in that the controllable means is a stepper motor (7) with a preferably rotationally symmetrical control element (9) which is arranged eccentrically on the free end of the stepper motor shaft (8) and is fixedly connected to the stepper motor shaft (8) the lamella-like parts (6a, 6b) are in operative connection and the stepping motor (8) is in signal-transmitting connection with a programmable thread brake control (13) with regard to its active parameters. Schußfadenbremse nach Anspruch 1, gekennzeichnet durch die Verwendung eines Scheibenmagnet-Schrittmotors.Weft brake according to claim 1, characterized by the use of a disc magnet stepper motor. Schußfadenbremse nach Anspruch 1, dadurch gekennzeichnet, daß die programmierbare Fadenbremssteuerung (13) eine Microkontrollsteuerung ist, die seriell mit der Webmaschinensteuerung (14) gekoppelt ist.Weft brake according to claim 1, characterized in that the programmable thread brake control (13) is a microcontroller which is serially coupled to the weaving machine control (14). Schußfadenbremse nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß die Einstellung der Wirkparameter über Menüs am Webmaschinen-Dialogterminal (12) erfolgt.Weft brake according to claims 1 to 3, characterized in that the setting of the knitting parameters takes place via menus on the weaving machine dialogue terminal (12).
EP93120354A 1993-03-05 1993-12-17 Weft yarn brake with controllable braking Withdrawn EP0613970A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4306911 1993-03-05
DE4306911A DE4306911C1 (en) 1993-03-05 1993-03-05 Shuttleless loom weft brake - has a step motor, for braking blades set by a control, for the braking parameters

Publications (1)

Publication Number Publication Date
EP0613970A1 true EP0613970A1 (en) 1994-09-07

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EP93120354A Withdrawn EP0613970A1 (en) 1993-03-05 1993-12-17 Weft yarn brake with controllable braking

Country Status (4)

Country Link
US (1) US5398731A (en)
EP (1) EP0613970A1 (en)
JP (1) JPH06264335A (en)
DE (1) DE4306911C1 (en)

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JP4003710B2 (en) * 2003-07-23 2007-11-07 株式会社豊田自動織機 Weft insertion control device in jet loom
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EP1136605A3 (en) * 2000-03-18 2003-10-01 Lindauer Dornier Gesellschaft M.B.H Thread breaking device, more especially weft breaking device for looms

Also Published As

Publication number Publication date
DE4306911C1 (en) 1993-12-23
US5398731A (en) 1995-03-21
JPH06264335A (en) 1994-09-20

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