EP0475892A1 - Yarn brake for looms - Google Patents

Yarn brake for looms Download PDF

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Publication number
EP0475892A1
EP0475892A1 EP91810649A EP91810649A EP0475892A1 EP 0475892 A1 EP0475892 A1 EP 0475892A1 EP 91810649 A EP91810649 A EP 91810649A EP 91810649 A EP91810649 A EP 91810649A EP 0475892 A1 EP0475892 A1 EP 0475892A1
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EP
European Patent Office
Prior art keywords
brake
thread
projectile
servomotor
thread brake
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.)
Granted
Application number
EP91810649A
Other languages
German (de)
French (fr)
Other versions
EP0475892B1 (en
Inventor
Oskar Hübner
Rudolf Stauner
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.)
Itema Switzerland Ltd
Original Assignee
Sulzer AG
Sultex AG
Gebrueder Sulzer AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sulzer AG, Sultex AG, Gebrueder Sulzer AG filed Critical Sulzer AG
Publication of EP0475892A1 publication Critical patent/EP0475892A1/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
    • 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
    • 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 a thread brake according to the preamble of claim 1 and projectile and rapier weaving machines with such thread brakes.
  • thread tensioners between the supply bobbins and the shed, each consisting of a thread brake and a retraction or tensioning lever.
  • a thread brake which has proven itself very well in practice, has on the one hand a resilient metal band, which is held under tension by a spring, and on the other hand a brake body, the braking part of which is, for example, spoon-shaped.
  • the thread can be clamped between the band and the brake body, the brake body being pressed against the brake band. Since the brake band is flexible, partial braking can also be carried out, in which the thread can still be pulled between the two braking components of the thread brake against frictional forces.
  • the brake body is moved mechanically via a linkage that is controlled by means of a camshaft.
  • Such thread brakes have the advantage that their braking power can be controlled by means of a logic circuit and that the braking power can be easily adjusted, for example with regard to changing yarn properties, especially when changing articles.
  • This object is achieved by the features of the characterizing part of claim 1.
  • a stepper motor is advantageously used as the servomotor for moving the brake body of the thread brake according to the invention, which has a drive shaft which, together with a permanent magnet attached to it, is rotated by a stationary ring of small electromagnets.
  • the electromagnets are arranged uniformly at angular intervals of, for example, 7.5 degrees and can be excited sequentially at time intervals of, for example, 2.5 milliseconds. With such a stepper motor, the brake can be opened in around 10 milliseconds.
  • the perspective view of the thread brake in Fig.1 shows the following components: the brake band 1; the brake body 2, which is pivotable about the axis 2a; a lever-like piece of sheet metal 3, over which the brake band 1 is tensioned by means of a spring 4; a horizontal, mandrel-like rod 5, at the tip of which the piece of sheet metal 3 is tiltably attached and which is connected at the other end 5a to other components of the weaving machine, not shown, for example a weft monitor and a supporting frame; Eyelet body 6a and 6b for guiding the weft thread 10; a vertical support beam 7, on which various components of the thread brake are attached.
  • FIG. 1 The following components can also be seen in FIG. 1: a support plate 8 for the stepper motor 20, which can be fastened in height on the support beam 7 by means of a screw 9; the drive shaft 21 and the connecting cable 22 of the stepping motor 20; a lever 23 fastened on the drive shaft 21 and a tab 24, via which a rotary movement of the stepping motor 20 can be converted into a lifting movement of the brake body 2; Finally, a small permanent magnet 29 placed on the lever 23, which makes it possible to determine a reference position of the stepping motor 20 by means of an inductive sensor 31.
  • the stepper motor 20 is connected via the connection cable 22 to a control circuit and a logic circuit, not shown.
  • the sensor 31 transmits its signals to this logic circuit.
  • a control program can be stored in the memory of the logic circuit for each thread brake, which generates a lifting curve optimally adapted to the yarn properties of the weft thread, for example.
  • the stroke curve in FIG. 2a shows the course over time of the position which the braking surface of the brake body 2 occupies.
  • the phase of the machine cycle (machine degree) is usually used as a variable, which can be determined by a crank angle sensor on the main shaft.)
  • the period length T of the weaving cycle (corresponding to 360 machine degrees) is of the order of magnitude of 200 milliseconds.
  • the stroke H is positive if the brake gap is open, i.e. the brake is released. Since the brake band 1 is flexible, the stroke H can also be negative. With a weakly negative stroke, the Thread are still pulled between brake band 1 and brake body 2.
  • the thread brake is in the "partial braking" state: curve pieces 50 and 50 '.
  • the thread brake is in the released state, with the exception of a short initial phase: curve piece 51.
  • the thread brake opening corresponding to curve piece 60 takes place within approximately 10 to 15 milliseconds.
  • the braking of the thread - curve piece 61 - is carried out less abruptly than the release in order to protect the weft thread; it is transferred to a state of "full braking”: curve section 52.
  • curve section 62 again sets the partial braking. Further details of the stroke curve of the thread brake in projectile weaving machines are discussed below in connection with FIGS. 4a and 4b.
  • the lifting movement of the brake body 2 ' is generated directly via a threaded spindle 21'.
  • the brake body 2 ' is guided in a link-like sleeve 201, whereby rotation is prevented, for example, by a groove in the brake body 2' and a comb in the sleeve 201.
  • the thread brake shown in the foreground is in the state of full or partial braking; the thread brake in the background is released.
  • the brake band 1 and the eyelet bodies 6a and 6b can have the same design as in the first exemplary embodiment (FIG. 1). As indicated in FIGS. 3a and 3a, the brake band 1 is anchored in the eyelet bodies 6a and 6b by means of suppositories 101, which are welded onto the band, for example.
  • the eyelet body 6a is fastened, for example, with a screw 102 to the sheet metal piece 3 that transmits the spring tension.
  • the stepper motor 20 has the shape of a flat box (diameter around 60 mm, height around 30 mm). Thanks to this shape, a compact arrangement can be set up for several thread brakes operating in parallel as shown in FIG. A compact arrangement is also possible for the thread brakes according to FIG. 3a if they are arranged offset, as shown in FIG. 3a.
  • the zero position can also be shifted vertically in the second exemplary embodiment (FIG. 2a) change the stepper motor with respect to a support structure, not shown.
  • the thread supply 11 with the weft thread 10 the thread brake according to the invention with the brake body 2 and the stepper motor 20, which is connected to the control and logic circuit 30; the tension lever 40 and the thread transmitter 41; the striking lever 42 and the projectile 43; the fabric 12 and the shed 13; the catch brake 80 for the projectile 43; a weft monitor 32 at the exit of the thread brake and a projectile catch monitor 33 on the catch side, both sensors 32 and 33 being connected to the logic circuit 30.
  • the thread transmitter 41 transfers the weft thread 10 to the projectile 43 and the thread brake begins with the lifting movement of its brake body 2.
  • the tensioning lever swivels 40 from its retracted position into the extended position, which is indicated in Fig.4b.
  • the thread brake must be released; because now the weft thread 10 is drawn off from the supply spool 11 or from a thread store (not shown) with full force by the accelerated projectile 41.
  • the weft thread 10 suffers the so-called draw stroke; this takes place at time S in the diagram in FIG. 2a.
  • the control of the thread brake must be programmed so that the Curve section 60 intersects the abscissa between points a and S.
  • the projectile 43 is brought to a standstill in the catch brake 80 at time B.
  • the thread brake also stops the movement of the weft thread 10.
  • the state of full braking ensures that, when the tensioning lever 40 is subsequently retracted, only weft thread 10 comes from the shed 13 and not also from the supply spool 11 (or from one thread storage, not shown) is tightened.
  • the brake band 1 and the brake body 2 can be designed, for example, in the form of a double finger or in the form of a metal belt loop.

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

Abstract

The yarn brake for projectile and gripper looms has a flexible brake band (1) and a controllably movable brake body (2), the latter being actuated according to the invention by a servomotor which can be controlled by programmed instructions. A stepping motor (20) is advantageously used as a servomotor. This yarn brake is suitable for high-speed looms for which, for example, present-day cam controls are too slow-acting. <IMAGE>

Description

Die Erfindung betrifft eine Fadenbremse gemäss Oberbegriff des Anspruchs 1 sowie Projektil- und Greiferwebmaschinen mit solchen Fadenbremsen.The invention relates to a thread brake according to the preamble of claim 1 and projectile and rapier weaving machines with such thread brakes.

Zwischen den Vorratsspulen und dem Webfach befinden sich bei Projektilwebmaschinen Fadenspanner, die je aus einer Fadenbremse und einem Rückzieher- oder Spannhebel bestehen. Eine Fadenbremse, die sich in der Praxis sehr gut bewährt hat, weist einerseits ein nachgiebiges Metallband auf, das mittels einer Feder gespannt gehalten wird, und andererseits einen Bremskörper, dessen bremsender Teil beispielsweise löffelförmig ausgebildet ist. Der Faden lässt sich zwischen dem Band und dem Bremskörper festklemmen, wobei der Bremskörper gegen das Bremsband gedrückt wird. Da das Bremsband nachgiebig ist, lässt sich auch eine partielle Bremsung vornehmen, bei welcher der Faden entgegen Reibkräften immer noch zwischen den beiden bremsenden Komponenten der Fadenbremse durchgezogen werden kann. Der Bremskörper wird mechanisch über ein Gestänge bewegt, das mittels einer Nockenwelle gesteuert wird.In projectile weaving machines there are thread tensioners between the supply bobbins and the shed, each consisting of a thread brake and a retraction or tensioning lever. A thread brake, which has proven itself very well in practice, has on the one hand a resilient metal band, which is held under tension by a spring, and on the other hand a brake body, the braking part of which is, for example, spoon-shaped. The thread can be clamped between the band and the brake body, the brake body being pressed against the brake band. Since the brake band is flexible, partial braking can also be carried out, in which the thread can still be pulled between the two braking components of the thread brake against frictional forces. The brake body is moved mechanically via a linkage that is controlled by means of a camshaft.

Es sind auch elektromagnetisch gesteuerte Fadenbremsen bekannt, bei denen ein oder mehrere Bremskörper durch Elektromagnete bewegt werden oder bei denen der Bremsspalt zwischen einer ferromagnetischen Lamelle und einer festen Gegenfläche mittels Elektromagneten beeinflusst wird (EP-A-0 294 323 = T.735). Solche Fadenbremsen weisen den Vorteil auf, dass deren Bremsleistung mittels einer Logikschaltung gesteuert werden kann und dass eine Anpassung der Bremsleistung beispielsweise bezüglich wechselnder Garnbeschaffenheit, insbesondere bei Artikelwechsel, einfach vorgenommen werden kann.Electromagnetically controlled thread brakes are also known in which one or more brake bodies are moved by electromagnets or in which the brake gap between a ferromagnetic plate and a fixed counter surface is influenced by means of electromagnets (EP-A-0 294 323 = T.735). Such thread brakes have the advantage that their braking power can be controlled by means of a logic circuit and that the braking power can be easily adjusted, for example with regard to changing yarn properties, especially when changing articles.

Die Anforderung an die Steuerung der Fadenbremse ist während der Phase des Projektilabschusses am grössten. Bis zur Fadenübergabe an das Projektil muss der Bremsspalt der Fadenbremse geschlossen sein und nach dem Abschuss, wenn Schussfaden nachgezogen wird, gelüftet. Bei schnelllaufenden Webmaschinen muss die Fadenbremse innert weniger Millisekunden gelüftet sein. Mit heutigen Nockensteuerungen ist dies nicht möglich; sie müssten in einer Leichtbauweise ausgeführt sein, die jedoch sehr teuer wäre. Auch bei der elektromagnetischen Steuerung ist eine zuverlässige Funktionstüchtigkeit der Fadenbremse nur schwer zu realisieren.The demands on the control of the thread brake are greatest during the projectile launch phase. Until the thread is transferred to the projectile, the brake gap of the thread brake must be closed and released after firing when the weft thread is pulled. With high-speed weaving machines, the thread brake must be released within a few milliseconds. This is not possible with today's cam controls; they would have to be lightweight, but would be very expensive. Reliable functionality of the thread brake is also difficult to achieve with electromagnetic control.

Bei schnelllaufenden Greiferwebmaschinen, bei denen der Schussfaden von einem Bringergreifer in die Mitte des Webfachs eingeführt und dort von einem Holergreifer übernommen wird, besteht auch ein Problem, das mit schnellsteuerbaren Fadenbremsen gelöst werden kann. Nach der Beschleunigung des Schussfadens durch den Bringergreifer, während der die Fadenbremse gelüftet sein muss, erfolgt auf den Übergabepunkt in der Fachmitte hin eine Verzögerung, bei welcher der Schussfaden wegen seiner Massenträgheit auf den Bringergreifer auflaufen oder ihn überholen kann. Um während der Verzögerungsphase den Schussfaden gespannt halten zu können, muss die Fadenbremse in Aktion treten. Jedoch unmittelbar nach der Übergabe an den Holergreifer muss der Schussfaden wieder freigegeben werden. Dies erfordert während der Fadenübergabe eine schnell reagierende Fadenbremse.There is also a problem with fast-running rapier weaving machines, in which the weft thread is inserted into the center of the shed by a bringer rapier and taken over by a rapier rapier, which can be solved with quickly controllable thread brakes. After acceleration of the weft thread by the rapier gripper, during which the thread brake must be released, there is a delay towards the transfer point in the center, at which the weft thread can run onto or overtake the rapier gripper due to its inertia. In order to keep the weft thread taut during the deceleration phase, the thread brake must be activated. However, immediately after the handover to the picker, the weft thread must be used again be released. This requires a fast-reacting thread brake during thread transfer.

Es ist Aufgabe der Erfindung, für schnelllaufende Projektil- oder Greiferwebmaschinen eine Fadenbremse zu schaffen, deren mechanischen Bremskomponenten durch herkömmliche und gut bewährte Mittel, nämlich Bremsband und Bremskörper, gebildet werden, deren Bremskörper hingegen durch Mittel steuerbar bewegt werden, die den erwähnten Anforderungen bei schnelllaufenden Webmaschinen genügen. Diese Aufgabe wird durch die Merkmale des Kennzeichens des Anspruchs 1 gelöst.It is an object of the invention to provide a thread brake for high-speed projectile or rapier weaving machines, the mechanical brake components of which are formed by conventional and well-proven means, namely the brake band and brake body, the brake bodies of which, on the other hand, are controllably moved by means which meet the requirements mentioned for high-speed ones Weaving machines are enough. This object is achieved by the features of the characterizing part of claim 1.

Als Stellmotor zum Bewegen des Bremskörpers der erfindungsgemässen Fadenbremse wird mit Vorteil ein Schrittmotor verwendet, der eine Antriebswelle aufweist, die zusammen mit einem an ihr befestigten Permanentmagneten durch einen stationären Kranz von kleinen Elektromagneten gedreht wird. Die Elektromagnete sind gleichmässig mit Winkelabständen von beispielsweise 7,5 Grad angeordnet und sind sequentiell in Zeitintervallen von beispielsweise 2,5 Millisekunden erregbar. Mit einem solchen Schrittmotor lässt sich die Bremse in rund 10 Millisekunden öffnen.A stepper motor is advantageously used as the servomotor for moving the brake body of the thread brake according to the invention, which has a drive shaft which, together with a permanent magnet attached to it, is rotated by a stationary ring of small electromagnets. The electromagnets are arranged uniformly at angular intervals of, for example, 7.5 degrees and can be excited sequentially at time intervals of, for example, 2.5 milliseconds. With such a stepper motor, the brake can be opened in around 10 milliseconds.

Nachfolgend wird die Erfindung anhand der Zeichnungen näher erläutert. Es zeigen:

  • Fig.1 ein erstes Ausführungsbeispiel der erfindungsgemässen Fadenbremse,
  • Fig.2a den zeitlichen Verlauf der Bremskörperstellung über einen Webzyklus (Hubkurve) für eine Projektilwebmaschine,
  • Fig.2b eine Hubkurve für eine Greiferwebmaschine,
  • Fig.3a ein zweites Ausführungsbeispiel der erfindungsgemässen Fadenbremse in Seitenansicht auf mindestens zwei parallel angeordnete Fadenbremsen, wobei bei der einen einzelne Teile als Schnitte dargestellt sind,
  • Fig.3b eine Draufsicht auf Fadenbremsen gemäss Fig.3a,
  • Fig.4a eine schematische Darstellung der beim Schusseintrag wichtigen Komponenten einer Projektilwebmaschine im Moment der Fadenübergabe an das Projektil und
  • Fig.4b die entsprechende Darstellung wie in Fig.4a kurz nach dem Projektilabschuss.
The invention is explained in more detail below with reference to the drawings. Show it:
  • 1 shows a first embodiment of the thread brake according to the invention,
  • 2a shows the time course of the brake body position over a weaving cycle (lifting curve) for a projectile weaving machine,
  • 2b shows a stroke curve for a rapier weaving machine,
  • 3a shows a second exemplary embodiment of the thread brake according to the invention in a side view of at least two thread brakes arranged in parallel, one of which shows individual parts as sections,
  • 3a shows a top view of thread brakes according to FIG. 3a,
  • 4a shows a schematic representation of the components of a projectile weaving machine that are important for weft insertion at the moment the thread is transferred to the projectile and
  • Fig.4b the corresponding representation as in Fig.4a shortly after projectile launch.

Die perspektivische Ansicht der Fadenbremse in Fig.1 zeigt folgende Komponenten: das Bremsband 1; den Bremskörper 2, der um die Achse 2a verschwenkbar ist; ein hebelartiges Blechstück 3, über welches das Bremsband 1 mittels einer Feder 4 gespannt wird; eine horizontale, dornartige Stange 5, an deren Spitze das Blechstück 3 kippbar aufgesetzt ist und die am anderen Ende 5a mit weiteren, nicht dargestellten Komponenten der Webmaschine, beispielsweise einem Schussfadenwächter und einem Traggestell, verbunden ist; Oesenkörper 6a und 6b für die Führung des Schussfadens 10; einen vertikalen Trägerbalken 7, an dem verschiedene Komponenten der Fadenbremse befestigt sind.The perspective view of the thread brake in Fig.1 shows the following components: the brake band 1; the brake body 2, which is pivotable about the axis 2a; a lever-like piece of sheet metal 3, over which the brake band 1 is tensioned by means of a spring 4; a horizontal, mandrel-like rod 5, at the tip of which the piece of sheet metal 3 is tiltably attached and which is connected at the other end 5a to other components of the weaving machine, not shown, for example a weft monitor and a supporting frame; Eyelet body 6a and 6b for guiding the weft thread 10; a vertical support beam 7, on which various components of the thread brake are attached.

Es sind in Fig.1 weiter folgende Komponenten zu sehen: eine Tragplatte 8 für den Schrittmotor 20, die mittels einer Schraube 9 in der Höhe einstellbar auf dem Trägerbalken 7 befestigt werden kann; die Antriebswelle 21 und das Anschlusskabel 22 des Schrittmotors 20; ein auf der Antriebswelle 21 befestigter Hebel 23 und eine Lasche 24, über welche eine Drehbewegung des Schrittmotors 20 in eine Hubbewegung des Bremskörpers 2 umgesetzt werden kann; schliesslich ein kleiner, auf dem Hebel 23 aufgesetzter Permanentmagnet 29, der erlaubt, mittels eines Induktivsensors 31 eine Referenzstellung des Schrittmotors 20 festzulegen.The following components can also be seen in FIG. 1: a support plate 8 for the stepper motor 20, which can be fastened in height on the support beam 7 by means of a screw 9; the drive shaft 21 and the connecting cable 22 of the stepping motor 20; a lever 23 fastened on the drive shaft 21 and a tab 24, via which a rotary movement of the stepping motor 20 can be converted into a lifting movement of the brake body 2; Finally, a small permanent magnet 29 placed on the lever 23, which makes it possible to determine a reference position of the stepping motor 20 by means of an inductive sensor 31.

Der Schrittmotor 20 ist über das Anschlusskabel 22 mit einer nicht dargestellten Ansteuerungs- sowie einer Logikschaltung verbunden. Der Sensor 31 übermittelt seine Signale an diese Logikschaltung. Im Speicher der Logikschaltung kann für jede Fadenbremse ein Steuerprogramm abgelegt sein, das eine auf beispielsweise die Garneigenschaften des Schussfadens optimal angepasste Hubkurve erzeugt.The stepper motor 20 is connected via the connection cable 22 to a control circuit and a logic circuit, not shown. The sensor 31 transmits its signals to this logic circuit. A control program can be stored in the memory of the logic circuit for each thread brake, which generates a lifting curve optimally adapted to the yarn properties of the weft thread, for example.

Die Hubkurve in Fig.2a zeigt den zeitlichen Verlauf der Lage, die die bremsende Fläche des Bremskörpers 2 einnimmt. (Anstelle der Zeit t wird üblicherweise die Phase des Maschinenzyklus (Maschinengrad) als Variable verwendet, die durch einen Kurbelwinkelgeber an der Hauptwelle ermittelt werden kann.) Die Periodenlänge T des Webzyklus (entsprechend 360 Maschinengrad) liegt in der Grössenordnung von 200 Millisekunden. Der Hub H ist positiv, wenn der Bremsspalt offen, die Bremse also gelüftet ist. Da das Bremsband 1 nachgiebig ist, kann der Hub H auch negativ sein. Bei einem schwach negativen Hub kann der Faden noch zwischen Bremsband 1 und Bremskörper 2 durchgezogen werden.The stroke curve in FIG. 2a shows the course over time of the position which the braking surface of the brake body 2 occupies. (Instead of the time t, the phase of the machine cycle (machine degree) is usually used as a variable, which can be determined by a crank angle sensor on the main shaft.) The period length T of the weaving cycle (corresponding to 360 machine degrees) is of the order of magnitude of 200 milliseconds. The stroke H is positive if the brake gap is open, i.e. the brake is released. Since the brake band 1 is flexible, the stroke H can also be negative. With a weakly negative stroke, the Thread are still pulled between brake band 1 and brake body 2.

Zu Beginn des Webzyklus sowie am Ende befindet sich die Fadenbremse im Zustand der "Teilbremsung": Kurvenstükke 50 und 50′. Während dem Intervall 70, während dem der Projektilflug erfolgt, ist die Fadenbremse mit Ausnahme einer kurzen Anfangsphase in gelüftetem Zustand: Kurvenstück 51. Das dem Kurvenstück 60 entsprechende Öffnen der Fadenbremse findet innerhalb von rund 10 bis 15 Millisekunden statt. Das Abbremsen des Fadens - Kurvenstück 61 - wird, um den Schussfaden zu schonen, weniger abrupt als das Lüften vorgenommen; es wird dabei in einen Zustand der "Vollbremsung" übergeleitet: Kurvenstück 52. Nach kurzer Vollbremsung wird wieder - Kurvenstück 62 - die Teilbremsung eingestellt. Auf weitere Details der Hubkurve der Fadenbremse bei Projektilwebmaschinen wird im folgenden im Zusammenhang mit den Figuren 4a und 4b eingegangen.At the beginning of the weaving cycle and at the end, the thread brake is in the "partial braking" state: curve pieces 50 and 50 '. During the interval 70 during which the projectile flight takes place, the thread brake is in the released state, with the exception of a short initial phase: curve piece 51. The thread brake opening corresponding to curve piece 60 takes place within approximately 10 to 15 milliseconds. The braking of the thread - curve piece 61 - is carried out less abruptly than the release in order to protect the weft thread; it is transferred to a state of "full braking": curve section 52. After a brief full braking, curve section 62 again sets the partial braking. Further details of the stroke curve of the thread brake in projectile weaving machines are discussed below in connection with FIGS. 4a and 4b.

Es ist beispielsweise auch möglich, die Fadenbremse so zu betätigen, dass auf die Teilbremsung verzichtet wird. Der Zustand der Fadenbremse wechselt dann lediglich zwischen Vollbremsung und Fadenfreigabe.For example, it is also possible to actuate the thread brake in such a way that partial braking is dispensed with. The state of the thread brake then only changes between full braking and thread release.

Die in Fig.2b dargestellte Hubkurve für Greiferwebmaschinen, wie sie durch die erfindungsgemässe Fadenbremse ermöglicht wird, unterscheidet sich wesentlich von der in Fig.2a durch die Zwischenbremsung (Kurvenstück 55). Wie einleitend schon erläutert worden ist, wird beim Schusseintrag (Intervall 70) vor der Fadenübergabe von Bringeran Holergreifer mit Vorteil kurzzeitig abgebremst und anschliessend die Fadenbremse wieder gelüftet (Kurvenstück 51′).The stroke curve shown in FIG. 2a for rapier weaving machines, as is made possible by the thread brake according to the invention, differs significantly from that in FIG. 2a by the intermediate braking (curve piece 55). As has already been explained in the introduction, during the weft insertion (interval 70) before the thread transfer from Bringeran Holergreifer is advantageously braked briefly and then the thread brake is released again (curve piece 51 ').

Beim zweiten, in Fig.3a dargestellten Ausführungsbeispiel wird die Hubbewegung des Bremskörpers 2' direkt über eine Gewindespindel 21′ erzeugt. Dabei wird der Bremskörper 2′ in einer kulissenartigen Hülse 201 geführt, wobei ein Mitdrehen beispielsweise durch eine Nut im Bremskörper 2′ und einen Kamm in der Hülse 201 verhindert wird. Die im Vordergrund dargestellte Fadenbremse befindet sich im Zustand der Voll- oder Teilbremsung; die Fadenbremse im Hintergrund ist gelüftet.In the second embodiment shown in Fig.3a, the lifting movement of the brake body 2 'is generated directly via a threaded spindle 21'. The brake body 2 'is guided in a link-like sleeve 201, whereby rotation is prevented, for example, by a groove in the brake body 2' and a comb in the sleeve 201. The thread brake shown in the foreground is in the state of full or partial braking; the thread brake in the background is released.

Das Bremsband 1 und die Oesenkörper 6a und 6b können gleich ausgebildet sein wie beim ersten Ausführungsbeispiel (Fig.1). Wie in Fig.3a und Fig.3b angedeutet, ist das Bremsband 1 mittels Zäpfchen 101, die auf dem Band beispielsweise aufgeschweisst sind, in den Oesenkörpern 6a und 6b verankert. Der Oesenkörper 6a ist beispielsweise mit einer Schraube 102 auf dem die Federspannung übertragenden Blechstück 3 befestigt.The brake band 1 and the eyelet bodies 6a and 6b can have the same design as in the first exemplary embodiment (FIG. 1). As indicated in FIGS. 3a and 3a, the brake band 1 is anchored in the eyelet bodies 6a and 6b by means of suppositories 101, which are welded onto the band, for example. The eyelet body 6a is fastened, for example, with a screw 102 to the sheet metal piece 3 that transmits the spring tension.

Der Schrittmotor 20 weist in den Ausführungsbeispielen die Form einer flachen Dose auf (Durchmesser rund 60 mm, Höhe rund 30 mm). Dank dieser Form lässt sich für mehrere parallel arbeitende Fadenbremsen gemäss Fig.1 eine kompakte Anordnung einrichten. Eine kompakte Anordnung ist auch für die Fadenbremsen gemäss Fig.3a möglich, wenn sie versetzt, wie in Fig.3b dargestellt, angeordnet werden.In the exemplary embodiments, the stepper motor 20 has the shape of a flat box (diameter around 60 mm, height around 30 mm). Thanks to this shape, a compact arrangement can be set up for several thread brakes operating in parallel as shown in FIG. A compact arrangement is also possible for the thread brakes according to FIG. 3a if they are arranged offset, as shown in FIG. 3a.

Die Nullage der Hubkurve (H=0) lässt sich beim ersten Ausführungsbeispiel (Fig.1) leicht verändern, indem man die Tragplatte 8 entlang dem Trägerbalken 7 verschiebt. Entsprechend lässt sich auch beim zweiten Ausführungsbeispiel (Fig.2a) die Nulllage durch vertikales Verschieben des Schrittmotors bezüglich einer nicht dargestellten Trägerkonstruktion verändern.The zero position of the stroke curve (H = 0) can be easily changed in the first exemplary embodiment (FIG. 1) by moving the support plate 8 along the support beam 7. Correspondingly, the zero position can also be shifted vertically in the second exemplary embodiment (FIG. 2a) change the stepper motor with respect to a support structure, not shown.

Anhand der Figuren 4a und 4b folgen nun noch zusätzliche Erläuterungen und Ergänzungen zur Projektilwebmaschine. Es sind folgende schematisch dargestellten Komponenten zu sehen: der Fadenvorrat 11 mit dem Schussfaden 10; die erfindungsgemässe Fadenbremse mit dem Bremskörper 2 und dem Schrittmotor 20, der mit der Ansteuerungs- und Logikschaltung 30 verbunden ist; der Spannhebel 40 und der Fadengeber 41; der Schlaghebel 42 und das Projektil 43; das Gewebe 12 und das Webfach 13; die Fangbremse 80 für das Projektil 43; ein Schussfadenwächter 32 am Ausgang der Fadenbremse und ein fangseitiger Projektil-Fangwächter 33, wobei beide Sensoren 32 und 33 mit der Logikschaltung 30 verbunden sind.Based on FIGS. 4a and 4b, additional explanations and additions to the projectile weaving machine now follow. The following components are shown schematically: the thread supply 11 with the weft thread 10; the thread brake according to the invention with the brake body 2 and the stepper motor 20, which is connected to the control and logic circuit 30; the tension lever 40 and the thread transmitter 41; the striking lever 42 and the projectile 43; the fabric 12 and the shed 13; the catch brake 80 for the projectile 43; a weft monitor 32 at the exit of the thread brake and a projectile catch monitor 33 on the catch side, both sensors 32 and 33 being connected to the logic circuit 30.

In der durch Fig.4a dargestellten Situation übergibt der Fadengeber 41 den Schussfaden 10 an das Projektil 43 und die Fadenbremse beginnt mit der Hubbewegung ihres Bremskörpers 2. Im Moment des Projektilabschusses, der durch den Zeitpunkt A in Fig.2a gegeben ist, schwenkt der Spannhebel 40 aus seiner Rückziehstellung in die Streckstellung, die in Fig.4b angedeutet ist. Nach dieser Schwenkbewegung, bei der die im Fadenspanner gepufferte Fadenlänge freigegeben wird, muss die Fadenbremse gelüftet sein; denn nun wird mit voller Kraft durch das beschleunigte Projektil 41 der Schussfaden 10 von der Vorratsspule 11 oder von einem nicht dargestellten Fadenspeicher abgezogen. Dabei erleidet der Schussfaden 10 den sogenannte Streckschlag; dieser findet zum Zeitpunkt S im Diagramm der Fig.2a statt. Die Steuerung der Fadenbremse muss so programmiert werden, dass das Kurvenstück 60 die Abszisse zwischen den Punkten à und S schneidet.In the situation represented by FIG. 4 a, the thread transmitter 41 transfers the weft thread 10 to the projectile 43 and the thread brake begins with the lifting movement of its brake body 2. At the moment the projectile is fired, which is given by the time A in FIG. 2 a, the tensioning lever swivels 40 from its retracted position into the extended position, which is indicated in Fig.4b. After this swiveling movement, during which the thread length buffered in the thread tensioner is released, the thread brake must be released; because now the weft thread 10 is drawn off from the supply spool 11 or from a thread store (not shown) with full force by the accelerated projectile 41. The weft thread 10 suffers the so-called draw stroke; this takes place at time S in the diagram in FIG. 2a. The control of the thread brake must be programmed so that the Curve section 60 intersects the abscissa between points a and S.

Das Projektil 43 wird zum Zeitpunkt B in der Fangbremse 80 zum Stillstand gebracht. Gleichzeitig stoppt die Fadenbremse auch die Bewegung des Schussfadens 10. Durch den Zustand der Vollbremsung (Kurvenstück 52) wird erreicht, dass bei der anschliessend eingeleiteten Rückziehbewegung des Spannhebels 40 nur Schussfaden 10 vom Webfach 13 her und nicht auch von der Vorratsspule 11 (oder von einem nicht dargestellten Fadenspeicher) nachgezogen wird.The projectile 43 is brought to a standstill in the catch brake 80 at time B. At the same time, the thread brake also stops the movement of the weft thread 10. The state of full braking (curve piece 52) ensures that, when the tensioning lever 40 is subsequently retracted, only weft thread 10 comes from the shed 13 and not also from the supply spool 11 (or from one thread storage, not shown) is tightened.

Es ist bekannt, mit einem fangseitigen Sensor 33 die Ankunftszeit des Projektils 43 zu überwachen, um so durch Beeinflussung der Anfangsbedingungen bei der Schussabgabe die Fadenspannung und damit die Flugdauer zu regulieren. Dank der Logikschaltung 30 lässt sich mit der erfindungsgemässen Fadenbremse eine solche Regelung gut realisieren.It is known to monitor the arrival time of the projectile 43 with a catch-side sensor 33 in order to regulate the thread tension and thus the flight duration by influencing the initial conditions when the weft is fired. Thanks to the logic circuit 30, such a control can easily be implemented with the thread brake according to the invention.

Bei den beschriebenen Ausführungsbeispielen der Fadenbremse ist auf die Vielfalt der Möglichkeiten, wie das Bremsband 1 und der Bremskörper 2 ausgeführt sein können, nicht näher eingegangen worden. Es sei aber doch noch folgendes erwähnt: Der Bremskörper 2 kann anstelle der Löffelform auch beispielsweise in Form eines Doppelfingers oder in der Form einer Metallbandschlaufe ausgebildet sein.In the described exemplary embodiments of the thread brake, the variety of possibilities for how the brake band 1 and the brake body 2 can be designed has not been discussed in detail. However, the following should also be mentioned: instead of the spoon shape, the brake body 2 can also be designed, for example, in the form of a double finger or in the form of a metal belt loop.

Claims (11)

Fadenbremse für Webmaschinen, mit Bremsband (1) und steuerbar bewegbarem Bremskörper (2), wobei der Faden (10) zwischen Bremsband und Bremskörper geführt ist, dadurch gekennzeichnet, dass der Bremskörper durch einen mit einer Ansteuer- und Logikschaltung (30) verbundenen Stellmotor (20) betätigbar ist, wobei eine Drehbewegung der Stellmotorwelle (21) in eine Hubbewegung des Bremskörpers (2) umgesetzt wird.Thread brake for weaving machines, with a brake band (1) and a controllably movable brake body (2), the thread (10) being guided between the brake band and the brake body, characterized in that the brake body is actuated by a servomotor () connected to a control and logic circuit (30). 20) can be actuated, a rotary movement of the servomotor shaft (21) being converted into a lifting movement of the brake body (2). Fadenbremse nach Anspruch 1, dadurch gekennzeichnet, dass der Stellmotor (20) ein Schrittmotor ist.Thread brake according to claim 1, characterized in that the servomotor (20) is a stepper motor. Fadenbremse nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Logikschaltung (30) mit einem Sensor (31) verbunden ist, mit dem eine Referenzstellung der Stellmotorwelle (21) registrierbar ist.Thread brake according to claim 1 or 2, characterized in that the logic circuit (30) is connected to a sensor (31) with which a reference position of the servomotor shaft (21) can be registered. Fadenbremse nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Stellmotor (20) über einen Hebel (23) und eine Lasche (24) mit dem Bremskörper (2) gelenkig verbunden ist, wobei der Bremskörper um eine Achse (2a) verschwenkbar ist.Thread brake according to one of claims 1 to 3, characterized in that the servomotor (20) is connected in an articulated manner to the brake body (2) via a lever (23) and a tab (24), the brake body being pivotable about an axis (2a) is. Fadenbremse nach den Ansprüchen 3 und 4, dadurch gekennzeichnet, dass am Hebel (23) ein Permanentmagnet (29) angeordnet ist und dass der Sensor (31) ein Induktivsensor ist, mit dem die Lage des Permanentmagneten (29) in der Referenzstellung feststellbar ist.Thread brake according to claims 3 and 4, characterized in that a permanent magnet (29) is arranged on the lever (23) and that the sensor (31) is an inductive sensor with which the position of the permanent magnet (29) can be determined in the reference position. Fadenbremse nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Stellmotor (20) den Bremskörper (2′) über eine Gewindespindel (21′) linear bewegt.Thread brake according to one of claims 1 to 3, characterized in that the servomotor (20) moves the brake body (2 ′) linearly via a threaded spindle (21 ′). Projektilwebmaschine mit mindestens einer Fadenbremse nach einem der Ansprüche 1 bis 6.Projectile loom with at least one thread brake according to one of claims 1 to 6. Projektilwebmaschine nach Anspruch 7 mit einem fangseitig angeordneten Fangwächter (33), der mit der Logikschaltung (30) der Fadenbremse verbunden ist.Projectile weaving machine according to claim 7 with a catch monitor (33) arranged on the catch side, which is connected to the logic circuit (30) of the thread brake. Greiferwebmaschine mit mindestens einer Fadenbremse nach einem der Ansprüche 1 bis 6.Rapier weaving machine with at least one thread brake according to one of claims 1 to 6. Verfahren zum Betreiben einer Projektilwebmaschine nach Anspruch 7, dadurch gekennzeichnet, dass das Lüften der Fadenbremse nach dem Projektilabschuss (Zeitpunkt A) und vor dem Streckschlag (Zeitpunkt S) erfolgt.Method for operating a projectile weaving machine according to claim 7, characterized in that the thread brake is released after the projectile has been fired (time A) and before the stretching stroke (time S). Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass das Öffnen der Fadenbremse weniger als 15 Millisekunden dauert.A method according to claim 10, characterized in that the opening of the thread brake takes less than 15 milliseconds.
EP91810649A 1990-09-10 1991-08-15 Yarn brake for looms Expired - Lifetime EP0475892B1 (en)

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CH293590 1990-09-10

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EP (1) EP0475892B1 (en)
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RU (1) RU2015221C1 (en)

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CN113174684B (en) * 2021-04-28 2022-07-12 范德威尔（中国）纺织机械有限公司 Weft brake and control method thereof
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DE4306911C1 (en) * 1993-03-05 1993-12-23 Dornier Gmbh Lindauer Shuttleless loom weft brake - has a step motor, for braking blades set by a control, for the braking parameters
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EP0613970A1 (en) * 1993-03-05 1994-09-07 Lindauer Dornier Gesellschaft M.B.H Weft yarn brake with controllable braking
EP0634509A1 (en) * 1993-07-15 1995-01-18 Lindauer Dornier Gesellschaft M.B.H Weft yarn breaking device for looms
DE4323748C1 (en) * 1993-07-15 1994-07-14 Dornier Gmbh Lindauer Weft brake
US5906330A (en) * 1994-02-14 1999-05-25 Aplicator System Ab Thread feeding buffer
WO1995021787A1 (en) * 1994-02-14 1995-08-17 Aplicator System Ab Thread feeding buffer
EP0707102A3 (en) * 1994-10-10 1998-05-27 L.G.L. ELECTRONICS S.p.A. Device for the positive modulated braking of the thread for weft feeders
BE1009678A3 (en) * 1995-10-02 1997-06-03 Picanol Nv Gripper loom with a thread brake
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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
US7077168B2 (en) 2002-04-23 2006-07-18 Lindauer Dornier Gesellschaft Mbh Thread tension regulation in a thread brake device and method in a textile processing machine
WO2005040470A1 (en) * 2003-10-21 2005-05-06 Iro Ab Method for the adjustment of the thread tension, and gripper shuttle loom or rapier loom
EP1811068A1 (en) * 2006-01-24 2007-07-25 Sultex AG Controlled weft brake

Also Published As

Publication number Publication date
CN1059942A (en) 1992-04-01
CN1026904C (en) 1994-12-07
US5179980A (en) 1993-01-19
DE59105505D1 (en) 1995-06-22
EP0475892B1 (en) 1995-05-17
JPH04245955A (en) 1992-09-02
RU2015221C1 (en) 1994-06-30

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