EP1194625B1 - Yarn feed device having a weight-relieving stop element - Google Patents

Yarn feed device having a weight-relieving stop element Download PDF

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Publication number
EP1194625B1
EP1194625B1 EP00958107A EP00958107A EP1194625B1 EP 1194625 B1 EP1194625 B1 EP 1194625B1 EP 00958107 A EP00958107 A EP 00958107A EP 00958107 A EP00958107 A EP 00958107A EP 1194625 B1 EP1194625 B1 EP 1194625B1
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EP
European Patent Office
Prior art keywords
lever
thread
feed device
spring element
yarn
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Expired - Lifetime
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EP00958107A
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German (de)
French (fr)
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EP1194625A1 (en
Inventor
Richard Kaufmann
Hermann Schmodde
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Memminger IRO GmbH
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Memminger IRO GmbH
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Publication of EP1194625A1 publication Critical patent/EP1194625A1/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices

Definitions

  • the invention relates to a yarn feeding device with the features of the preamble of claim 1.
  • At yarn feeding devices elements are often provided to monitor whether the current to the or from the yarn feeding device thread is properly present and whether the supplied from the yarn feeding device thread is delivered in the correct amount or with the right voltage.
  • bow-shaped levers are often provided, which are pivotally mounted on the yarn feeding device and load with one end on the thread.
  • Such a yarn feeding device is, for example, from the U.S. Patent 5,860,298 known.
  • the yarn feeding device has a thread supply drum attached to a vertical shaft, which is arranged in a yarn path.
  • the yarn feeler levers are arranged which extend obliquely downwards and rest with their free end on the thread. Tear the thread or is in the thread run path in question too large amount of thread available, the levers pivot under the action of their own weight down and actuate switch that can serve, for example, to park the downstream textile machine.
  • the levers pivot under the effect of their own weight. This must, in order to achieve a reliable pivoting movement even if the yarn feeding device under practical operating conditions of some contamination, have a minimum weight. On the other hand, this leads to an increased friction on the yarn feeler lever, which can be disadvantageous especially for thin and / or delicate threads. If particularly small thread tensions are desired, problems may arise from too great a bearing force in that the thread feeler lever tightens the thread. The minimum thread tension must be so high that the thread lifts the thread feeler lever.
  • the lever pivotally mounted on the base support is connected to a relief device which reduces the weight of the lever at least in part of its pivoting range by means of spring force.
  • the relief device thus results in that the lever is loaded with a comparatively reduced force on the thread.
  • the friction between the thread and the relevant point of the lever can be reduced.
  • the reduction of the weight of the lever is preferably dependent on the pivot angle.
  • a deflection-dependent, non-linearly related to the deflection angle of the lever Auflastkraft on the thread, realize. This can increase the trigger safety, even if the yarn feeder is subject to contamination.
  • Spring elements for generating a force opposing the weight allow weight to be relieved without appreciably increasing the moment of inertia of the lever, so that it can react quickly to yarn breakage or decreasing yarn tension.
  • the weight relief compensates for their weight at least partially. By the ceramic parts, the life of the parts in contact with the thread is increased.
  • the spring element preferably acts on the lever via such a lever arm that a neutral point is present in the swivel area, in which the spring element does not introduce any torque into the lever. In this neutral point, the torque reverses its sign, so that the spring element switches from a weight reduction to an additional load. This can increase the shutdown safety.
  • the spring element is preferably part of an electrical switch, so that no additional switch actuating forces would have to be applied.
  • the force generated to relieve the weight of the lever is also the shutdown. This has the significant advantage that the full (not relieved and not reduced) weight of the lever is available to operate the switch, although this is weight relieved from the viewpoint of the thread.
  • the spring element may, for example, be formed by a U-shaped bending spring. This can be advantageously additionally use as a switching element. If the bending spring is relatively long-legged, ie, the legs are longer than their distance from each other, the bending spring element swings relatively strong even with a slight pivoting movement of the lever. It can be used as a switching element of a switch, with the possible translation, ie the relatively stronger pivoting movement of the spiral spring compared to the pivotal movement of the lever well and clearly defined switching points are obtained.
  • FIG. 1 is a yarn feeding device 1 illustrated, which serves to deliver a thread 2 to a not further illustrated textile machine.
  • the yarn feeding device 1 has a base support 3, which is to be connected via a fastening device 4 with the textile machine or a holder provided on this and forms a two-shell housing.
  • a thread supply drum 5 is provided via a vertically arranged, rotatably mounted shaft, which is connected to one end of the shaft. With its other end, the shaft via a clutch plate 6 with drive pulleys 7, 8 can be coupled.
  • the thread 2 wraps around the thread supply drum 5 several times and, if this is driven in rotation, supplied positively to the downstream textile machine.
  • yarn guide elements 9, 11 are arranged in its path. These include an open Fadeneinlaufbaum 12, a thread braking device 14 and arranged between the yarn braking device 14 and the yarn supply drum 5 inlet eye 15th
  • a yarn inlet-side sensing lever 16 is disposed between the yarn braking device 14 and the inlet eye 15.
  • the feeler lever 16 is bow-shaped. It engages around with two legs 17, the base support 3 and is pivotally mounted on or in this about a pivot axis 18. With its end 19, which may be provided with a wear-reducing coating or a wear-reducing element such as a ceramic sleeve or the like., The thread feeler lever 16 loads on the thread 2. This is in particular FIG. 2 seen.
  • a further sensing lever 21 is provided on the outlet side, which is mounted pivotably about a horizontal pivot axis 22 on the base support 3.
  • the thread feeler lever 21 is also bow-shaped and carries at its lower free end an eyelet 23 which is formed of a durable material, such as. Ceramic.
  • the eyelet 23 is arranged substantially between two belonging to the thread guide elements 11 eyelets 24, 25 and loads on the thread 2. When this is stretched, he raises the eyelet 23 between the yarn guide eyelets 24, 25.
  • the eyelet 23 has in the Thread pad a very large radius. As a result, sharp thread deflections are avoided.
  • the eyelet 23 is largely wear-resistant to the current thread, but has a not insignificant mass.
  • the eyelet 23 may also be a ceramic-coated molded element, which, however, also increases the weight of the Abstellelements.
  • Both levers 16, 21 are lifted by the thread 2 from its free hanging position out. If the thread tension drops, the levers 16, 21 pivot downwards. They actuate an electrical switch which is in communication with arranged in the region of the fastening device 4 contact elements 26. In addition, an indicator lamp 27 is driven to signal the occurred state.
  • the yarn feeler levers 16, 21 are weight relieved. This means that they do not rest on the thread 2 with all the force caused by their weight.
  • a relief device 31 is illustrated, the lever 16 with a by an arrow 32 indicated torque applied, which counteracts the caused by the weight of the lever 16 torque (arrow 33).
  • a spring element 34 which is designed as a compression spring. It is formed by a two legs 35, 36 having bending spring 37 made of a spring metal. The two legs 35, 36 are angled away from each other.
  • the lever 16 is connected to a body 38 which is arranged concentrically to the axis of rotation 18 and has a bearing recess 39 on its side facing the bending spring 37. This takes up the free end of the leg 36.
  • the other leg 35 is supported in a bearing recess 41 of a contact element 42.
  • the point of contact between the leg 35 and the bottom of the recess 41 is a bearing or hinge point.
  • the point of contact between the free end of the leg 36 and the bottom of the recess 39 is a bearing or hinge point.
  • the distance of the bottom of the bearing recess 39 from the axis of rotation 18 forms a short lever L, which is at an obtuse angle to the connecting line between the recesses 39, 41.
  • the spiral spring element 37 extends in the direction of a contact element 43, at the free end of a contact spring 44 is held. This is arranged so that its free tongue-like resilient end protrudes into the pivoting region of the bending spring 37.
  • the pivoting range is dimensioned such that the bending spring element 37 does not touch the contact tongue 44 when the lever 16 is in the desired position, while the bending spring element 37 contacts the contact tongue 44 when the lever 16 pivots downwards.
  • the angular position of the lever L and the connecting line between the support points 41, 39 is dimensioned such that the torque 32 decreases when the lever 16 pivots downward. It goes first to zero and, if the support point 39 under a connecting line between the rotation axis 8 and the support point 41 device, also change its sign and thus increase the pivoting down of the lever 16 even more.
  • the lever 21 may be provided with a similar relief device 31. Both relief devices thus form electrical switches that can be connected to strip conductors 50, 51, 52.
  • the printed conductors can serve to connect the signal lamp 27 or the contacts 26 (FIG. FIG. 2 ) to contact.
  • the yarn feeding device 1 described so far operates as follows:
  • the thread keeps 2, as in FIG. 2 illustrates, both levers 16, 21 in the raised position, in which the bending springs 37 have no contact with their respective associated contact blades 44.
  • the bending springs 37 support the levers 16, 21 and generate a torque which is opposite to the torque generated by the respective weight of the lever 16, 21 and this partially compensated. It is slightly less than the self-torque of the respective lever 16, 21, so that it lies on the thread 2 with a significantly reduced weight.
  • one or more yarn feeler levers 16, 21 are provided, which rest on the yarn 2 with a force that is in the desired position of the lever, i. with proper threadline, is low. If the lever pivots out because the thread tension decreases or the thread tears, the force with which the lever 16, 21 rests on the thread 2 increases. This is effected, for example, by a relief device 31 which partially compensates for the lever weight and applies a pivot angle-dependent compensating force. With increasing pivoting of the lever, the compensation force preferably decreases.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Looms (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Abstract

The invention relates to a yarn feed device in which one or more yarn detector levers (16) are provided which, while resting on the yarn, exert a force thereon that is small when the lever (16) is in a specified position, i.e. during proper yarn travel. If the lever pivots outward due to a slackening of the yarn tension or a tear in the yarn, the force with which the lever exerts onto the yarn increases. This is, for example, effected by a load-relieving device (31) which partially offsets the lever weight and exerts a compensation force which is dependent on the pivoting angle. The compensation force preferably decreases as the lever continues to pivot outward.

Description

Die Erfindung betrifft ein Fadenliefergerät mit den Merkmalen des Oberbegriffs des Patentanspruchs 1.The invention relates to a yarn feeding device with the features of the preamble of claim 1.

An Fadenliefergeräten sind häufig Elemente vorgesehen, die zu überwachen haben, ob der zu dem oder aus dem Fadenliefergerät laufende Faden ordnungsgemäß vorhanden ist und ob der von dem Fadenliefergerät gelieferte Faden in der richtigen Menge oder mit der richtigen Spannung geliefert wird. In beiden Fällen werden häufig bügelförmige Hebel vorgesehen, die an dem Fadenliefergerät schwenkbar gelagert sind und mit einem Ende auf dem Faden lasten.At yarn feeding devices elements are often provided to monitor whether the current to the or from the yarn feeding device thread is properly present and whether the supplied from the yarn feeding device thread is delivered in the correct amount or with the right voltage. In both cases, bow-shaped levers are often provided, which are pivotally mounted on the yarn feeding device and load with one end on the thread.

Ein solches Fadenliefergerät ist bspw. aus der US-PS 5.860.298 bekannt. Das Fadenliefergerät weist eine an einer vertikalen Welle befestigte Fadenliefertrommel auf, die in einem Fadenlaufweg angeordnet ist. In dem Fadenlaufweg vor und nach der Fadenliefertrommel sind die Fadenfühlhebel angeordnet, die sich schräg nach unten erstrecken und mit ihrem freien Ende auf dem Faden aufliegen. Reißt der Faden oder ist in dem betreffenden Fadenlaufweg eine zu große Fadenmenge vorhanden, schwenken die Hebel unter Wirkung ihres Eigengewichts nach unten und betätigen dabei Schalter, die bspw. zum Abstellen der nachgeordneten Textilmaschine dienen können.Such a yarn feeding device is, for example, from the U.S. Patent 5,860,298 known. The yarn feeding device has a thread supply drum attached to a vertical shaft, which is arranged in a yarn path. In the thread running path before and after the thread supply drum, the yarn feeler levers are arranged which extend obliquely downwards and rest with their free end on the thread. Tear the thread or is in the thread run path in question too large amount of thread available, the levers pivot under the action of their own weight down and actuate switch that can serve, for example, to park the downstream textile machine.

Die Hebel verschwenken unter der Wirkung ihres Eigengewichts. Dieses muss, um eine zuverlässige Schwenkbewegung auch dann zu erreichen wenn das Fadenliefergerät unter praktischen Betriebsbedingungen einer gewissen Verschmutzung unterliegt, ein Mindestgewicht aufweisen. Andererseits führt dies zu einer erhöhten Reibung an dem Fadenfühlhebel, was insbesondere bei dünnen und/oder empfindlichen Fäden nachteilig sein kann. Sind besonders kleine Fadenspannungen gewünscht, können sich aus einer zu großen Auflagekraft insofern Probleme ergeben, als der Fadenfühlhebel den Faden spannt. Die minimale Fadenzugkraft muss so groß sein, dass der Faden den Fadenfühlhebel anhebt.The levers pivot under the effect of their own weight. This must, in order to achieve a reliable pivoting movement even if the yarn feeding device under practical operating conditions of some contamination, have a minimum weight. On the other hand, this leads to an increased friction on the yarn feeler lever, which can be disadvantageous especially for thin and / or delicate threads. If particularly small thread tensions are desired, problems may arise from too great a bearing force in that the thread feeler lever tightens the thread. The minimum thread tension must be so high that the thread lifts the thread feeler lever.

Aus der EP 0 224 797 A ist eine Fadenfühlereinrichtung mit einem schwenkbar gelagerten Hebel bekannt.From the EP 0 224 797 A is a thread sensor device with a pivotally mounted lever known.

Im Gegensatz zur Erfindung wird die Gewichtskraft des den Faden belastenden Hebels von der Federkraft vollständig überwunden.In contrast to the invention, the weight of the thread loading lever is completely overcome by the spring force.

Davon ausgehend ist es Aufgabe der Erfindung, hier abzuhelfen.On this basis, it is an object of the invention to remedy this situation.

Diese Aufgabe wird mit einem Fadenliefergerät gelöst, das die Merkmale des Patentanspruchs 1 aufweist.This object is achieved with a yarn feeding device having the features of claim 1.

Erfindungsgemäß ist der an dem Grundträger schwenkbar gelagerte Hebel mit einer Entlastungseinrichtung verbunden, die die Gewichtskraft des Hebels wenigstens in einem Teil seines Schwenkbereichs mittel Federkraft reduziert. Die Entlastungseinrichtung führt somit dazu, dass der Hebel mit einer vergleichsweise verminderten Kraft auf dem Faden lastet. Dadurch kann die Reibung zwischen dem Faden und der betreffenden Stelle des Hebels reduziert werden. Außerdem wird es möglich, auch relativ schwache Fäden zu überwachen und/oder mit reduzierten Fadenspannungen zu arbeiten.According to the invention, the lever pivotally mounted on the base support is connected to a relief device which reduces the weight of the lever at least in part of its pivoting range by means of spring force. The relief device thus results in that the lever is loaded with a comparatively reduced force on the thread. As a result, the friction between the thread and the relevant point of the lever can be reduced. In addition, it becomes possible to monitor even relatively weak threads and / or to work with reduced thread tensions.

Die Reduktion der Gewichtskraft des Hebels ist vorzugsweise vom Schwenkwinkel abhängig. Auf diese Weise lässt sich eine auslenkungsabhängige, mit dem Auslenkwinkel des Hebels nichtlinear zusammenhängende Auflastkraft auf dem Faden, realisieren. Das kann die Auslösesicherheit erhöhen, auch wenn das Fadenliefergerät Verschmutzungseinflüssen unterliegt.The reduction of the weight of the lever is preferably dependent on the pivot angle. In this way, a deflection-dependent, non-linearly related to the deflection angle of the lever Auflastkraft on the thread, realize. This can increase the trigger safety, even if the yarn feeder is subject to contamination.

Federelemente zur Erzeugung einer der Gewichtskraft entgegengerichteten Kraft gestatten eine Gewichtsentlastung ohne nennenswerte Erhöhung des Trägheitsmoments des Hebels herbeizuführen, so dass dieser schnell auf Fadenbruch oder nachlassende Fadenspannung reagieren kann.Spring elements for generating a force opposing the weight allow weight to be relieved without appreciably increasing the moment of inertia of the lever, so that it can react quickly to yarn breakage or decreasing yarn tension.

Es können an dem Fadenfühlelement verschleißminderende Keramikteile verwendet werden. Die Gewichtsentlastung kompensiert deren Gewicht wenigstens teilweise. Durch die Keramikteile wird die Lebensdauer der mit dem Faden in Berührung stehenden Teile erhöht.It can be used on the yarn feeler wear-reducing ceramic parts. The weight relief compensates for their weight at least partially. By the ceramic parts, the life of the parts in contact with the thread is increased.

Das Federelement greift vorzugsweise über einen solchen Hebelarm an dem Hebel an, dass in dem Schwenkbereich ein Neutralpunkt vorhanden ist, bei dem das Federelement kein Drehmoment in den Hebel einleitet. In diesem.Neutralpunkt kehrt das Drehmoment sein Vorzeichen um, so dass das Federelement von einer Gewichtsentlastung zu einer Zusatzbelastung umschaltet. Dies kann die Abschaltsicherheit erhöhen.The spring element preferably acts on the lever via such a lever arm that a neutral point is present in the swivel area, in which the spring element does not introduce any torque into the lever. In this neutral point, the torque reverses its sign, so that the spring element switches from a weight reduction to an additional load. This can increase the shutdown safety.

Das Federelement ist vorzugsweise Teil eines elektrischen Schalters, so dass keine zusätzlichen Schalterbetätigungskräfte aufgebracht werden müßten. Die zur Gewichtsentlastung des Hebels erzeugte Kraft ist zugleich die Abschaltkraft. Dies hat den wesentlichen Vorteil, dass zur Betätigung des Schalters die volle (nicht entlastete und nicht reduzierte) Gewichtskraft des Hebels zur Verfügung steht, obwohl dieser aus Sicht des Fadens gewichtsentlastet ist.The spring element is preferably part of an electrical switch, so that no additional switch actuating forces would have to be applied. The force generated to relieve the weight of the lever is also the shutdown. This has the significant advantage that the full (not relieved and not reduced) weight of the lever is available to operate the switch, although this is weight relieved from the viewpoint of the thread.

Das Federelement kann bspw. durch eine U-förmige Biegefeder gebildet sein. Diese lässt sich vorteilhafterweise zusätzlich als Schaltelement benutzen. Ist die Biegefeder relativ langschenklig, d.h. sind die Schenkel länger als deren Abstand voneinander, schwenkt das Biegefederelement schon bei einer geringfügigen Schwenkbewegung des Hebels relativ stark aus. Es kann als Schaltglied eines Schalters benutzt werden, wobei durch die mögliche Übersetzung, d.h. die vergleichsweise stärkere Schwenkbewegung der Biegefeder im Vergleich zu der Schwenkbewegung des Hebels gut und klar definierte Schaltpunkte erhalten werden.The spring element may, for example, be formed by a U-shaped bending spring. This can be advantageously additionally use as a switching element. If the bending spring is relatively long-legged, ie, the legs are longer than their distance from each other, the bending spring element swings relatively strong even with a slight pivoting movement of the lever. It can be used as a switching element of a switch, with the possible translation, ie the relatively stronger pivoting movement of the spiral spring compared to the pivotal movement of the lever well and clearly defined switching points are obtained.

Weitere vorteilhafte Einzelheiten der Erfindung ergeben sich aus der Zeichnung, der Beschreibung oder Unteransprüchen.Further advantageous details of the invention will become apparent from the drawing, the description or claims.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung veranschaulicht. Es zeigen:

  • Fig. 1 ein Fadenliefergerät in einer perspektivischen Darstellung,
  • Fig. 2 das Fadenliefergerät nach Figur 1, in einer Seitenansicht,
  • Fig. 3 einen Gehäuseteil des Fadenliefergeräts nach den Figuren 1 und 2, mit eingelegten Kontaktelementen und Gewichtsentlastungsmechanismus für die Fadenfühlhebel, und
  • Fig. 4 den Gewichtsentlastungsmechanismus des Fadenliefergeräts nach den Figuren 1 und 2, in einer schematisierten Seitenansicht.
In the drawing, an embodiment of the invention is illustrated. Show it:
  • Fig. 1 a yarn feeding device in a perspective view,
  • Fig. 2 the yarn feeding device after FIG. 1 in a side view
  • Fig. 3 a housing part of the yarn feeding device after the FIGS. 1 and 2 , with inserted contact elements and weight relief mechanism for the thread feeler levers, and
  • Fig. 4 the weight-relieving mechanism of the yarn feeding device after the FIGS. 1 and 2 , in a schematic side view.

In Figur 1 ist ein Fadenliefergerät 1 veranschaulicht, das dazu dient, einen Faden 2 zu einer nicht weiter veranschaulichten Textilmaschine zu liefern. Das Fadenliefergerät 1 weist einen Grundträger 3 auf, der über eine Befestigungseinrichtung 4 mit der Textilmaschine oder einem an dieser vorgesehenen Halter zu verbinden ist und ein zweischaliges Gehäuse bildet. An dem Grundträger 3 ist über eine vertikal angeordnete, drehbar gelagerte Welle eine Fadenliefertrommel 5 vorgesehen, die mit einem Ende der Welle verbunden ist. Mit ihrem anderen Ende ist die Welle über eine Kupplungsscheibe 6 mit Antriebsscheiben 7, 8 kuppelbar.In FIG. 1 is a yarn feeding device 1 illustrated, which serves to deliver a thread 2 to a not further illustrated textile machine. The yarn feeding device 1 has a base support 3, which is to be connected via a fastening device 4 with the textile machine or a holder provided on this and forms a two-shell housing. On the base support 3, a thread supply drum 5 is provided via a vertically arranged, rotatably mounted shaft, which is connected to one end of the shaft. With its other end, the shaft via a clutch plate 6 with drive pulleys 7, 8 can be coupled.

Der Faden 2 umschlingt die Fadenliefertrommel 5 mehrmals und wird, wenn diese drehend angetrieben wird, der nachgeordneten Textilmaschine positiv zugeliefert. Zur weiteren Führung des Fadens 2 sind in seinem Laufweg Fadenleitelemente 9, 11 angeordnet. Zu diesen gehören eine offene Fadeneinlauföse 12, eine Fadenbremseinrichtung 14 und eine zwischen der Fadenbremseinrichtung 14 und der Fadenliefertrommel 5 angeordnete Einlauföse 15.The thread 2 wraps around the thread supply drum 5 several times and, if this is driven in rotation, supplied positively to the downstream textile machine. For further guidance of the thread 2 yarn guide elements 9, 11 are arranged in its path. These include an open Fadeneinlauföse 12, a thread braking device 14 and arranged between the yarn braking device 14 and the yarn supply drum 5 inlet eye 15th

Ein fadeneinlaufseitiger Fühlhebel 16 ist zwischen der Fadenbremseinrichtung 14 und der Einlauföse 15 angeordnet. Der Fühlhebel 16 ist bügelförmig ausgebildet. Er umgreift mit zwei Schenkeln 17 den Grundträger 3 und ist an bzw. in diesem um eine Schwenkachse 18 schwenkbar gelagert. Mit seinem Ende 19, das mit einer verschleißmindernden Beschichtung oder einem verschleißmindernden Element wie einer Keramikhülse oder dgl. versehen sein kann, lastet der Fadenfühlhebel 16 auf dem Faden 2. Dies ist insbesondere aus Figur 2 ersichtlich.A yarn inlet-side sensing lever 16 is disposed between the yarn braking device 14 and the inlet eye 15. The feeler lever 16 is bow-shaped. It engages around with two legs 17, the base support 3 and is pivotally mounted on or in this about a pivot axis 18. With its end 19, which may be provided with a wear-reducing coating or a wear-reducing element such as a ceramic sleeve or the like., The thread feeler lever 16 loads on the thread 2. This is in particular FIG. 2 seen.

An dem Fadenliefergerät 1 ist auslaufseitig ein weiterer Fühlhebel 21 vorgesehen, der um eine horizontale Schwenkachse 22 schwenkbar an dem Grundträger 3 gelagert ist. Der Fadenfühlhebel 21 ist ebenfalls bügelförmig ausgebildet und trägt an seinem unteren freien Ende ein eine Öse 23, die aus einem widerstandsfähigen Material ausgebildet ist, wie bspw. Keramik. Die Öse 23 ist dabei im Wesentlichen zwischen zwei zu den Fadenleitelementen 11 gehörigen Fadenösen 24, 25 angeordnet und lastet auf dem Faden 2. Wenn dieser gestreckt ist, hebt er die Öse 23 zwischen die Fadenleitösen 24, 25. Die Öse 23 hat im Bereich der Fadenauflage einen sehr großen Radius. Dadurch werden scharfe Fadenumlenkungen vermieden. Die Öse 23 ist gegen den laufenden Faden weitgehend verschleißfest, hat jedoch eine nicht zu vernachlässigende Masse. Die Öse 23 kann auch ein keramikbeschichtetes Formelement sein, das jedoch ebenfalls das Gewicht des Abstellelements erhöht.On the yarn feeding device 1, a further sensing lever 21 is provided on the outlet side, which is mounted pivotably about a horizontal pivot axis 22 on the base support 3. The thread feeler lever 21 is also bow-shaped and carries at its lower free end an eyelet 23 which is formed of a durable material, such as. Ceramic. The eyelet 23 is arranged substantially between two belonging to the thread guide elements 11 eyelets 24, 25 and loads on the thread 2. When this is stretched, he raises the eyelet 23 between the yarn guide eyelets 24, 25. The eyelet 23 has in the Thread pad a very large radius. As a result, sharp thread deflections are avoided. The eyelet 23 is largely wear-resistant to the current thread, but has a not insignificant mass. The eyelet 23 may also be a ceramic-coated molded element, which, however, also increases the weight of the Abstellelements.

Beide Hebel 16, 21 sind durch den Faden 2 aus ihrer frei herabhängenden Position heraus angehoben. Fällt die Fadenspannung weg, schwenken die Hebel 16, 21 nach unten. Dabei betätigen sie einen elektrischen Schalter, der mit im Bereich der Befestigungseinrichtung 4 angeordneten Kontaktelementen 26 in Verbindung steht. Außerdem wird eine Anzeigelampe 27 angesteuert, um den eingetretenen Zustand zu signalisieren.Both levers 16, 21 are lifted by the thread 2 from its free hanging position out. If the thread tension drops, the levers 16, 21 pivot downwards. They actuate an electrical switch which is in communication with arranged in the region of the fastening device 4 contact elements 26. In addition, an indicator lamp 27 is driven to signal the occurred state.

Die Fadenfühlhebel 16, 21 sind gewichtsentlastet. Dies bedeutet, dass sie nicht mit der ganzen, von ihrem Gewicht verursachten, Kraft auf dem Faden 2 aufliegen.The yarn feeler levers 16, 21 are weight relieved. This means that they do not rest on the thread 2 with all the force caused by their weight.

In Figur 4 ist eine Entlastungseinrichtung 31 veranschaulicht, die den Hebel 16 mit einem durch einen Pfeil 32 angedeuteten Drehmoment beaufschlagt, das dem durch das Gewicht des Hebels 16 verursachten Drehmoment (Pfeil 33) entgegenwirkt. Zu der Entlastungseinrichtung 33 gehört ein Federelement 34, das als Druckfeder ausgebildet ist. Es wird durch eine zwei Schenkel 35, 36 aufweisende Biegefeder 37 aus einem Federmetall gebildet. Die beiden Schenkel 35, 36 sind voneinander weg abgewinkelt.In FIG. 4 a relief device 31 is illustrated, the lever 16 with a by an arrow 32 indicated torque applied, which counteracts the caused by the weight of the lever 16 torque (arrow 33). To the relief device 33 includes a spring element 34, which is designed as a compression spring. It is formed by a two legs 35, 36 having bending spring 37 made of a spring metal. The two legs 35, 36 are angled away from each other.

Der Hebel 16 ist mit einem konzentrisch zu der Drehachse 18 angeordneten Körper 38 verbunden, der an seiner der Biegefeder 37 zugewandten Seite eine Lagerausnehmung 39 aufweist. Diese nimmt das freie Ende des Schenkels 36 auf. Der andere Schenkel 35 stützt sich hingegen in einer Lagerausnehmung 41 eines Kontaktelements 42 ab. Der Berührungspunkt zwischen dem Schenkel 35 und dem Boden der Ausnehmung 41 ist ein Lager- oder Gelenkpunkt. Gleichermaßen ist der Berührungspunkt zwischen dem freien Ende des Schenkels 36 und dem Boden der Ausnehmung 39 ein Lager- oder Gelenkpunkt. Der Abstand des Bodens der Lagerausnehmung 39 von der Drehachse 18 bildet einen kurzen Hebel L, der an einem stumpfen Winkel zu der Verbindungslinie zwischen den Ausnehmungen 39, 41 steht.The lever 16 is connected to a body 38 which is arranged concentrically to the axis of rotation 18 and has a bearing recess 39 on its side facing the bending spring 37. This takes up the free end of the leg 36. The other leg 35, however, is supported in a bearing recess 41 of a contact element 42. The point of contact between the leg 35 and the bottom of the recess 41 is a bearing or hinge point. Likewise, the point of contact between the free end of the leg 36 and the bottom of the recess 39 is a bearing or hinge point. The distance of the bottom of the bearing recess 39 from the axis of rotation 18 forms a short lever L, which is at an obtuse angle to the connecting line between the recesses 39, 41.

Das Biegefederelement 37 erstreckt sich in Richtung zu einem Kontaktelement 43, an dessen freien Ende eine Kontaktfeder 44 gehalten ist. Diese ist so angeordnet, dass ihr freies zungenartiges federndes Ende in den Schwenkbereich der Biegefeder 37 ragt. Der Schwenkbereich ist dabei so bemessen, dass das Biegefederelement 37 die Kontaktzunge 44 nicht berührt, wenn der Hebel 16 in Sollposition befindlich ist, während das Biegefederelement 37 die Kontaktzunge 44 kontaktiert, wenn der Hebel 16 nach unten schwenkt. Die Winkelstellung des Hebels L und der Verbindungslinie zwischen den Abstützpunkten 41, 39 ist so bemessen, dass das Drehmoment 32 abnimmt, wenn der Hebel 16 nach unten schwenkt. Es geht zunächst gegen Null und kann, wenn der Abstützpunkt 39 unter eine Verbindungslinie zwischen der Drehachse 8 und dem Abstützpunkt 41 gerät, auch sein Vorzeichen wechseln und somit das Herunterschwenken des Hebels 16 noch verstärken.The spiral spring element 37 extends in the direction of a contact element 43, at the free end of a contact spring 44 is held. This is arranged so that its free tongue-like resilient end protrudes into the pivoting region of the bending spring 37. The pivoting range is dimensioned such that the bending spring element 37 does not touch the contact tongue 44 when the lever 16 is in the desired position, while the bending spring element 37 contacts the contact tongue 44 when the lever 16 pivots downwards. The angular position of the lever L and the connecting line between the support points 41, 39 is dimensioned such that the torque 32 decreases when the lever 16 pivots downward. It goes first to zero and, if the support point 39 under a connecting line between the rotation axis 8 and the support point 41 device, also change its sign and thus increase the pivoting down of the lever 16 even more.

Wie aus Figur 3 hervorgeht, kann der Hebel 21 mit einer ebensolchen Entlastungseinrichtung 31 versehen sein. Beide Entlastungseinrichtungen bilden somit elektrische Schalter, die an Leiterbahnen 50, 51, 52 angeschlossen sein können. Die Leiterbahnen können dazu dienen, die Signallampe 27 bzw. die Kontakte 26 (Figur 2) zu kontaktieren.How out FIG. 3 it can be seen, the lever 21 may be provided with a similar relief device 31. Both relief devices thus form electrical switches that can be connected to strip conductors 50, 51, 52. The printed conductors can serve to connect the signal lamp 27 or the contacts 26 (FIG. FIG. 2 ) to contact.

Das insoweit beschriebene Fadenliefergerät 1 arbeitet wie folgt:The yarn feeding device 1 described so far operates as follows:

In Betrieb hält der Faden 2, wie in Figur 2 veranschaulicht, beide Hebel 16, 21 in angehobener Stellung, in der die Biegefedern 37 keinen Kontakt mit den ihnen jeweils zugeordneten Kontaktzungen 44 haben. Die Biegefedern 37 stützen dabei die Hebel 16, 21 ab und erzeugen ein Drehmoment, das dem von dem jeweiligen Eigengewicht des Hebels 16, 21 erzeugten Drehmoment entgegengerichtet ist und dieses teilweise kompensiert. Es ist etwas geringer als das Eigendrehmoment des jeweiligen Hebels 16, 21, so dass dieser mit deutlich vermindertem Gewicht auf dem Faden 2 liegt.In operation, the thread keeps 2, as in FIG. 2 illustrates, both levers 16, 21 in the raised position, in which the bending springs 37 have no contact with their respective associated contact blades 44. The bending springs 37 support the levers 16, 21 and generate a torque which is opposite to the torque generated by the respective weight of the lever 16, 21 and this partially compensated. It is slightly less than the self-torque of the respective lever 16, 21, so that it lies on the thread 2 with a significantly reduced weight.

Tritt nun bspw. am Fadeneinlauf ein Fadenbruch auf, fällt die den Hebel 16 in Position haltende Fadenkraft weg und der Hebel 16 schwenkt zunächst mit geringer Kraft nach unten. Gleichzeitig nimmt jedoch die Gewichtskompensation ab, so dass der Hebel nun deutlich und kräftig nach unten schwenkt und den zugeordneten Schalter schließt. Der gleiche Vorgang läuft ab, wenn an der Auslaufseite des Fadenliefergeräts ein Fadenbruch auftritt oder eine zu große Fadenmenge geliefert wird, so dass der Faden zwischen den Fadenleitösen 24 und 25 durchzuhängen beginnt.If, for example, a thread break occurs at the thread inlet, the thread force holding the lever 16 in position falls away and the lever 16 pivots first with little force down. At the same time, however, the weight compensation decreases, so that the lever now clearly and strongly pivots down and closes the associated switch. The same process takes place when at the outlet side of the yarn feeding device, a yarn breakage occurs or too large amount of yarn is delivered, so that the thread between the yarn guide eyelets 24 and 25 begins to sag.

Bei einem Fadenliefergerät 1 sind ein oder mehrere Fadenfühlhebel 16, 21 vorgesehen, die mit einer Kraft auf dem Faden 2 aufliegen, die in Sollposition des Hebels, d.h. bei ordnungsgemäßem Fadenlauf, gering ist. Schwenkt der Hebel aus, weil die Fadenspannung nachlässt oder der Faden gerissen ist, nimmt die Kraft mit der der Hebel 16, 21 auf dem Faden 2 aufliegt zu. Dies wird bspw. durch eine Entlastungseinrichtung 31 bewirkt, die das Hebelgewicht teilweise kompensiert und eine schwenkwinkelabhängige Kompensationskraft aufbringt. Mit zunehmendem Ausschwenken des Hebels nimmt die Kompensationskraft vorzugsweise ab.In a yarn feeding device 1, one or more yarn feeler levers 16, 21 are provided, which rest on the yarn 2 with a force that is in the desired position of the lever, i. with proper threadline, is low. If the lever pivots out because the thread tension decreases or the thread tears, the force with which the lever 16, 21 rests on the thread 2 increases. This is effected, for example, by a relief device 31 which partially compensates for the lever weight and applies a pivot angle-dependent compensating force. With increasing pivoting of the lever, the compensation force preferably decreases.

Claims (10)

  1. Thread feed device (1) for feeding at least one thread to a textile machine, with a base support (3), on which at least one lever (16), which is pivotably amounted about a substantially horizontal pivot axis (18), is provided, which, at an end (19) remote from the pivot axis (18), touches the thread (2) under the action of its weight force, characterised in that the lever (16) is connected to a load-relieving mechanism (31), which has a spring element (37) as the source of force and reduces the weight force of the lever (16) at least in one part of its pivoting range in such a way that the lever (16) loads the thread with a reduced weight force.
  2. Thread feed device according to claim 1, characterised in that the load-relieving mechanism (31) significantly reduces the weight force in a pivoting range, in which the thread (2) has lifted the lever (16) to its desired position, and in that, in a pivoting range, in which the lever (16) is lowered to a lower position, it reduces the weight force less or does not reduce it or else increases it.
  3. Thread feed device according to claim 1, characterised in that the spring element (37) engages by means of a lever arm (L) on the lever (16) and in that the pivoting range of the lever (16), if the spring element (37) is a compression spring element, includes a position, in which the angle between the lever arm (L) and the compression spring element is 180°, and if the spring element (37) is a tension spring, includes a position, in which the angle between the lever arm (L) and the tension spring element is 0°.
  4. Thread feed device according to claim 1, characterised in that the lever (16) is provided, at its end (19), with a wear-reducing coating or a wear-resistant element (23).
  5. Thread feed device according to claim 4, characterised in that the element (23) is a ceramic element, the weight of which is at least partially compensated by the spring element (37) in the desired position.
  6. Thread feed device according to claim 1, characterised in that the spring element (37) is part of an electric switch.
  7. Thread feed device according to claim 1, characterised in that the spring element is a flexible spring (37) bent in a u-shape, one leg (35) of which is supported on an abutment (41) and the other leg (36) of which is supported on a lever arm (L), which is connected to the lever (16).
  8. Thread feed device according to claim 7, characterised in that the flexible spring (37) has legs (35, 36) which are significantly longer than their spacing from one another.
  9. Thread feed device according to claim 7, characterised in that a contact element (44) is associated with the flexible spring (37), with which contact element the flexible spring (37) comes into or out of contact when the lever (16) is pivoted.
  10. Thread feed device according to claim 9, characterised in that the contact element (44) is arranged close to the flexible spring element (37) at the end thereof, at which the legs (35, 36) are connected to one another.
EP00958107A 1999-07-12 2000-07-06 Yarn feed device having a weight-relieving stop element Expired - Lifetime EP1194625B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19932483A DE19932483A1 (en) 1999-07-12 1999-07-12 Thread delivery device with weight-relieved rack
DE19932483 1999-07-12
PCT/DE2000/002208 WO2001004401A1 (en) 1999-07-12 2000-07-06 Yarn feed device having a weight-relieving stop element

Publications (2)

Publication Number Publication Date
EP1194625A1 EP1194625A1 (en) 2002-04-10
EP1194625B1 true EP1194625B1 (en) 2011-03-23

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EP00958107A Expired - Lifetime EP1194625B1 (en) 1999-07-12 2000-07-06 Yarn feed device having a weight-relieving stop element

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US (1) US6637693B1 (en)
EP (1) EP1194625B1 (en)
KR (1) KR100493997B1 (en)
CN (1) CN1304668C (en)
AU (1) AU6979100A (en)
CZ (1) CZ200228A3 (en)
DE (2) DE19932483A1 (en)
EG (1) EG22567A (en)
MY (1) MY133395A (en)
PE (1) PE20010650A1 (en)
TR (1) TR200200023T2 (en)
TW (1) TW469309B (en)
WO (1) WO2001004401A1 (en)

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DE10113184B4 (en) * 2001-02-26 2006-04-20 Memminger-Iro Gmbh Knitting machine thread feed unit has a lever spring-operated moving end-stop
DE60116448T2 (en) 2001-08-01 2006-08-03 Thermocore Medical Systems Nv Device for blood vessel wall temperature measurement
IT201700053150A1 (en) 2017-05-17 2018-11-17 Lgl Electronics Spa YARN BREAKING SENSOR FOR TEXTILE EQUIPMENT
CN109811462A (en) * 2019-04-08 2019-05-28 邹伟夫 A kind of footwear machine Shu Sha mechanism
DE102023114844B3 (en) 2023-06-06 2024-05-16 Memminger-IRO Gesellschaft mit beschränkter Haftung Thread feeding device

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US706840A (en) * 1901-06-26 1902-08-12 E H Godshalk Automatic stop-motion for knitting-machines.
US1506152A (en) * 1921-08-19 1924-08-26 James K Lanning Stop mechanism for knitting machines
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DE2245869A1 (en) * 1972-09-19 1974-03-28 Karl Bous PROCESS AND DEVICE FOR DELIVERING AND TENSIONING YARNS WITH ADJUSTABLE, CONSTANT THREAD TENSION
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US5860298A (en) * 1997-05-23 1999-01-19 Jen Hui Chen Thread feeder with thread-twisting preventive device for knitting machines

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CZ200228A3 (en) 2002-04-17
US6637693B1 (en) 2003-10-28
WO2001004401A1 (en) 2001-01-18
MY133395A (en) 2007-11-30
DE50016082D1 (en) 2011-05-05
CN1360649A (en) 2002-07-24
KR20020020778A (en) 2002-03-15
PE20010650A1 (en) 2001-06-19
AU6979100A (en) 2001-01-30
CN1304668C (en) 2007-03-14
KR100493997B1 (en) 2005-06-13
TW469309B (en) 2001-12-21
TR200200023T2 (en) 2002-09-23
DE19932483A1 (en) 2001-01-18
EG22567A (en) 2003-04-30
EP1194625A1 (en) 2002-04-10

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