EP0451176B1 - Yarn feed device - Google Patents

Yarn feed device Download PDF

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Publication number
EP0451176B1
EP0451176B1 EP90900833A EP90900833A EP0451176B1 EP 0451176 B1 EP0451176 B1 EP 0451176B1 EP 90900833 A EP90900833 A EP 90900833A EP 90900833 A EP90900833 A EP 90900833A EP 0451176 B1 EP0451176 B1 EP 0451176B1
Authority
EP
European Patent Office
Prior art keywords
thread
delivery device
speed
drive
friction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP90900833A
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German (de)
French (fr)
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EP0451176A1 (en
Inventor
Lars Helge Gottfrid Tholander
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Iro AB
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Iro AB
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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
    • B65H59/16—Braked elements rotated by 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
    • 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
    • B65H59/18—Driven rotary elements
    • 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 delivery device according to the preamble of claim 1 and a method according to the preamble of claim 10.
  • an air nozzle near the yarn supply device is used as an auxiliary device, which, either alone or in cooperation with an arm which can be pivoted transversely to the yarn path, keep thread tension changes for the yarn storage and delivery device small during each take-off cycle of the yarn searches, which also result from the cyclically changing winding direction of the thread in the storage device designed as a bobbin.
  • the auxiliary device takes over, so to speak, part of the deduction work of the thread storage and delivery device.
  • the aim is to reduce the number of thread breaks.
  • the air nozzle represents a source of error in the thread path, since an exact adaptation of the action of the pneumatic auxiliary device on the thread to the thread speed in the thread storage and delivery device is difficult.
  • the invention has for its object to provide a yarn delivery device of the type mentioned and a method with which the number of yarn breaks in general and specifically in the yarn storage and delivery device is further reduced.
  • a mechanical friction drive acting on the thread with slip is able to adjust the thread speed upstream of the thread storage and delivery device so sensitively by means of an assist conveying that undesirably high loads for the thread are present in the thread storage and delivery device be avoided. This results in a noticeable decrease in thread breaks in general and in the thread storage and delivery device in particular.
  • the friction drive can be adapted to the take-off speed of the thread storage and delivery device with little control effort. It also dampens tension peaks that result from the changing winding direction of the thread (thread plucker) on the bobbin.
  • the friction drive is structurally simple, takes up little space and can be easily adapted to different thread qualities.
  • the surface that the thread touches must not be sticky, but should be relatively smooth, gentle on the thread and wear-resistant.
  • a hard chrome-plated aluminum rotating surface or a plasma-coated ceramic surface is well suited for this purpose.
  • the drive provides power for the thread; depending on the thread tension, the thread absorbs as much force as it needs to reach the required thread speed.
  • the thread storage and delivery device is largely relieved of this task. Modulation of the action on the thread is also possible by influencing the drive transmission in the friction drive.
  • Another embodiment is set out in claim 4.
  • the wrap angle of the thread in the friction drive By changing the wrap angle of the thread in the friction drive, the action on the thread can be modulated in that stronger assist support is controlled with a larger wrap angle, whereas weaker assist support is controlled with a smaller wrap angle.
  • the wrap angle serves as a control variable for the slip.
  • the thread deflection from the bobbin to the memory which was previously required in the usual vertical bobbin and horizontal thread storage and delivery device, is taken over by the friction drive as an additional advantage (claim 5).
  • the friction roller can be light and low inertia and can be quickly accelerated and decelerated to the required speed. Thread plucking from the bobbin compensates for the friction roller.
  • the clutch according to claim 6 causes the thread with the friction roller can also run without its direct drive if this is favorable under certain operating conditions. In the run-down phase in particular, the thread is pulled over the engaged clutch and the falling drive speed braked clean, which at least largely prevents the thread from running on due to its mass and thus an undesirable transfer.
  • the friction roller can be braked quickly with the braking device or can be braked specifically and modulated when working and generate a desired thread tension. If necessary, a one-way locking freewheel is then also provided.
  • the specially selected surface covering of the friction roller according to claim 8 also determines the slippage of the thread.
  • different surface coverings can be provided axially next to one another, of which the appropriate one is used.
  • the embodiment according to claim 9 is important because the speed control unit carries out the precise control of the friction drive as a function of the thread speed determined by the thread storage and delivery device. However, it is also conceivable to drive the friction drive independently, and the actual thread speed can only be achieved by modulating the action, e.g. through the slip to regulate. Even particularly sensitive or weak threads can be processed unbreakable at high speed.
  • a uniform adaptation of the thread speed for the thread storage and delivery device is achieved.
  • the thread no longer breaks even at high speed and relatively sharp deflection.
  • the deliberately controlled Difference in speed causes the slippage that is needed to assist the assist (braking or accelerating).
  • the process variant according to claim 11 is simple in terms of control technology. From the beginning, the increase in slip increases.
  • the work area is divided into several adjoining areas.
  • the thread e.g. braked in the phase-out phase of the thread storage and delivery device to prevent overrun, because the friction drive runs slower than the thread or stands still.
  • the friction drive can be uncoupled from its drive, the thread is then exposed to the mechanical resistance to movement of the friction drive, which suppresses tension fluctuations.
  • the friction drive which is driven faster than the thread, provides an excess speed that the thread with slippage absorbs at least in part if necessary.
  • the precisely metered assist delivery also suppresses tension fluctuations in the thread in this speed range.
  • the assist promotion brakes in the area of low thread speed, while it feeds at higher thread speed.
  • a delivery device 1 for a thread Y to a textile machine 2 e.g. an air jet weaving machine
  • an insertion device 3 e.g. an air nozzle provided to the textile machine.
  • the insertion device 3 is preceded by a thread eye 5 and a thread storage and delivery device 4, which, if a weft thread of dimensioned length is to be processed, can have a measuring device for the weft thread length respectively output.
  • a further thread eyelet 6 is provided upstream of the thread storage and delivery device 4.
  • a drive motor 7 of the thread storage and delivery device connected to a controller (not shown) drives a winding element 18, which winds the thread Y on a storage surface 19. With this type of thread storage and delivery device 4, a significant thread deflection occurs in the area 20, which can cause thread breaks at high thread speeds.
  • the thread Y comes from a thread supply device 8, for example a conical bobbin 9, on which it is wound, for example crossing with changing direction.
  • An auxiliary device 10 is arranged between the bobbin 9 and the thread eyelet 6, expediently close to the bobbin 9.
  • the auxiliary device 10 is a friction drive R with a friction roller 11, for example with a frictionally active surface.
  • the friction roller 11 is with an adjustable drive 12, for example one Stepper motor, in drive connection.
  • the control of the drive 7 of the thread storage and delivery device 4 is connected via a line 16 to a control unit 15 which is informed of the thread speed.
  • the drive 12 can also be connected to the control unit 15 via a line 17.
  • a clutch 13 that can be released and engaged, possibly modulated, can be arranged, which, when released, enables the friction roller 11 to run faster or slower than that Drive motor 12.
  • a modular braking device for the friction roller 11 could also be provided. If necessary, instead of the clutch 13, a freewheel that only locks in the drive direction is provided.
  • the coil 9 is vertical; the thread storage and delivery device 4, however, approximately horizontal.
  • the thread 4 is deflected on the friction roller 11 with a wrap angle ⁇ of approximately 90 °.
  • the angle ⁇ can be adjusted.
  • the entry device 3 pulls off the thread storage and delivery device 4, for example length sections which are exactly predetermined in length.
  • the drive motor 7 constantly maintains a thread supply in the thread storage and delivery device 4 and pulls the thread Y from the bobbin 9. This is done so that the thread runs practically continuously.
  • the pulling of the thread Y from the bobbin 9 is opposed by a certain unwinding resistance and possibly tension peaks when the winding direction changes (thread plucking).
  • the auxiliary device 10 assists in conveying the yarn Y at the speed required by the yarn storage and delivery device or brakes it so that changes in the tension in the yarn Y remain small. Tension fluctuations due to changing winding direction (thread plucking) on the bobbin 9 are compensated or filtered out by the auxiliary device 10 and are almost no longer noticeable in the area 20 of the thread deflection in the device 4.
  • the exact control of the drive motor 12 or the friction roller 11 in accordance with the speed in the thread storage and delivery device 4 is particularly important because it influences the speed (friction) during the sharp deflection of the thread, e.g. at the outlet of the winding element 18 is eliminated.
  • speed e.g. at the outlet of the winding element 18 is eliminated.
  • excessive thread tension and dangerous changes in tension are largely avoided in area 20 by the assistance promotion, ie factors that were a suspected cause of thread breaks occurring there.
  • the thread speed KY remains below the peripheral speed KR of the friction drive in the entire working area. Both speed curves are idealized as straight lines with different increases. Between the thread and the friction drive, an increasing slip occurs with increasing thread speed, so that the friction drive can always push when the thread storage and delivery device 4 requires it.
  • the curve KY of the thread speed VY is divided into three areas A, B, C.
  • Area A ranges up to a relative low speed reference value a; the range B from a to a higher speed reference value b; the range C from b to the highest speed reference value c (max. thread speed value VYmax).
  • the thread is braked by the friction drive, which may be stationary.
  • the clutch is engaged. This is particularly important in the phase-out phase.
  • area B the clutch is released.
  • the friction drive turns freely with the thread; slip occurs due to the rotational resistance of the friction drive.
  • area C the friction drive is driven with a positive excess speed, the clutch is engaged.
  • the thread is fed with slip.
  • the slip decreases and the assisted support increases or vice versa. Again, the tension is kept relatively low and even.
  • the result is an inconsistent speed curve KR for the friction drive, the curve KR in FIG. 3 being exaggerated or idealized.
  • a reference speed value d along the curve KY e.g. depending on the thread quality, selected so that there are two areas D, E.
  • VY With increasing thread speed VY, the friction drive in area D is driven more slowly than the thread until the friction drive curve KR crosses curve KY at point d.
  • area E the friction drive is driven with increasing excess speed.
  • the curve KR can ideally be a straight line (FIG. 4a) or a flat S curve (FIG. 4b) with the turning point at point d. Under special operating conditions, the friction drive could also be driven with the thread movement in the opposite direction in order to intentionally generate an even stronger braking.

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

Abstract

Yarn feed device for textile machines (2), in particular for automatic air jet looms, comprising a device (4) for storing and feeding yarn arranged between a supply device (8) and the insertion device (3) of the textile machine, as well as an auxiliary device (10) arranged on the path of the yarn between the yarn supply device and the device for storing and feeding yarn. The auxiliary device (10) comprises a friction drive (R) for the yarn (Y). In a process for driving a yarn, the circumferential speed (KR) of a friction drive (10) which constitutes the auxiliary device is set at a higher or lower value than the yarn speed (KY) in the device (4) for storing and feeding yarn, and the yarn (Y) is fed or braked on the circumference of the friction drive with a slip which is maintained during the feed.

Description

Die Erfindung betrifft eine Fadenliefervorrichtung gemäß dem Oberbegriff des Anspruchs 1 sowie ein Verfahren gemäß dem Oberbegriff von Anspruch 10.The invention relates to a thread delivery device according to the preamble of claim 1 and a method according to the preamble of claim 10.

Bei einer aus der BE-PS 900 041 bekannten Fadenliefervorrichtung dient als Hilfsvorrichtung eine Luftdüse nahe der Fadenvorratsvorrichtung, die entweder allein oder in Zusammenwirkung mit einem quer zum Fadenweg federnd schwenkbaren Arm Fadenspannungsänderungen für die Fadenspeicher- und -liefervorrichtung während jedes Abzugstakts des Fadens klein zu halten sucht, die auch aus der sich zyklisch ändernden Wickelrichtung des Fadens in der als Spule ausgebildeten Vorratsvorrichtung resultieren. Die Hilfsvorrichtung übernimmt sozusagen einen Teil der Abzugsarbeit der Fadenspeicher- und Liefervorrichtung. Insbesondere bei den hohen Fadengeschwindigkeiten in Luftdüsenwebmaschinen wird so eine Verringerung der Zahl der Fadenbrüche angestrebt. Die Luftdüse stellt jedoch mit dem Schwenkarm eine Fehlerquelle im Fadenweg dar, da eine exakte Anpassung der Einwirkung der pneumatischen Hilfsvorrichtung auf den Faden auf die Fadengeschwindigkeit in der Fadenspeicher- und -liefervorrichtung schwierig ist.In a yarn delivery device known from BE-PS 900 041, an air nozzle near the yarn supply device is used as an auxiliary device, which, either alone or in cooperation with an arm which can be pivoted transversely to the yarn path, keep thread tension changes for the yarn storage and delivery device small during each take-off cycle of the yarn searches, which also result from the cyclically changing winding direction of the thread in the storage device designed as a bobbin. The auxiliary device takes over, so to speak, part of the deduction work of the thread storage and delivery device. In particular with the high thread speeds in air jet weaving machines, the aim is to reduce the number of thread breaks. However, with the swivel arm, the air nozzle represents a source of error in the thread path, since an exact adaptation of the action of the pneumatic auxiliary device on the thread to the thread speed in the thread storage and delivery device is difficult.

Der Erfindung liegt die Aufgabe zugrunde, eine Fadenliefervorrichtung der eingangs genannten Art sowie ein Verfahren anzugeben, mit denen die Zahl der Fadenbrüche allgemein und speziell in der Fadenspeicher- und -liefervorrichtung weiter reduziert ist.The invention has for its object to provide a yarn delivery device of the type mentioned and a method with which the number of yarn breaks in general and specifically in the yarn storage and delivery device is further reduced.

Die gestellte Aufgabe wird mit den im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Merkmalen sowie mit dem Verfahren gemäß Anspruch 11 gelöst.The object is achieved with the features specified in the characterizing part of patent claim 1 and with the method according to claim 11.

Ein mechanisch und mit Schlupf auf den Faden wirkender Friktionsantrieb (slip-feed) ist in der Lage, mittels einer Assistförderung die Fadengeschwindigkeit stromauf der Fadenspeicher- und -liefervorrichtung so feinfühlig einzustellen, daß in der Fadenspeicher- und -liefervorrichtung unerwünscht starke Belastungen für den Faden vermieden werden. Daraus resultiert eine spürbare Abnahme der Fadenbrüche allgemein und in der Fadenspeicherund -liefervorrichtung im besonderen. Der Friktionsantrieb laßt sich mit geringem steuerungstechnischen Aufwand an die Abzugsgeschwindigkeit der Fadenspeicher- und -liefervorrichtung anpassen. Er dämpft auch Spannungspitzen, die aus der wechselnden Wickelrichtung des Fadens (Fadenzupfer) auf der Spule resultieren. Der Friktionsantrieb ist baulich einfach, benötigt wenig Platz und läßt sich gut an unterschiedliche Fadenqualitäten anpassen. Die Oberfläche, die der Faden berührt, darf nicht klebrig sein, sondern soll verhältnismäßig glatt, fadenschonend und dabei verschleißfest sein. Z.B. eignet sich eine hartverchromte Aluminium-Rotationsfläche oder eine plasmabeschichtete Keramik-Oberfläche gut für diesen Zweck.A mechanical friction drive acting on the thread with slip (slip-feed) is able to adjust the thread speed upstream of the thread storage and delivery device so sensitively by means of an assist conveying that undesirably high loads for the thread are present in the thread storage and delivery device be avoided. This results in a noticeable decrease in thread breaks in general and in the thread storage and delivery device in particular. The friction drive can be adapted to the take-off speed of the thread storage and delivery device with little control effort. It also dampens tension peaks that result from the changing winding direction of the thread (thread plucker) on the bobbin. The friction drive is structurally simple, takes up little space and can be easily adapted to different thread qualities. The surface that the thread touches must not be sticky, but should be relatively smooth, gentle on the thread and wear-resistant. E.g. A hard chrome-plated aluminum rotating surface or a plasma-coated ceramic surface is well suited for this purpose.

Eine zweckmäßige Ausführungsform geht aus Anspruch 2 hervor. Die Modulation der Einwirkung auf den Faden ermöglicht die präzise Anpassung an die jeweilige Fadengeschwindigkeit, z.B. durch Auswahl der rotierenden Oberfläche des Friktionsantriebs.An expedient embodiment emerges from claim 2. The modulation of the action on the thread enables precise adaptation to the respective thread speed, e.g. by selecting the rotating surface of the friction drive.

Bei der Ausführungsform gemäß Anspruch 3 kommen zwei Einflüsse zum Tragen. Der Antrieb stellt Kraft für den Faden bereit; der Faden nimmt in Abhängigkeit von der Fadenspannung soviel Kraft auf, wie er zum Erreichen der erforderlichen Fadengeschwindigkeit benötigt. Die Fadenspeicher- und -liefervorrichtung wird von dieser Aufgabe weitgehend entlastet. Eine Modulation der Einwirkung auf den Faden ist auch durch Einflußnahme auf die Antriebsübertragung im Friktionsantrieb möglich.In the embodiment according to claim 3 come two Influences to bear. The drive provides power for the thread; depending on the thread tension, the thread absorbs as much force as it needs to reach the required thread speed. The thread storage and delivery device is largely relieved of this task. Modulation of the action on the thread is also possible by influencing the drive transmission in the friction drive.

Eine weitere Ausführungsform geht aus Anspruch 4 hervor. Es läßt sich durch die Veränderung des Umschlingungswinkels des Fadens im Friktionsantrieb die Einwirkung auf den Faden modulieren, indem mit größerem Umschlingungswinkel eine stärkere Assistförderung, hingegen mit kleinerem Umschlingungswinkel eine schwächere Assistförderung eingesteuert wird. Der Umschlingungswinkel dient neben der Fadenspannung als Regelgröße für den Schlupf.Another embodiment is set out in claim 4. By changing the wrap angle of the thread in the friction drive, the action on the thread can be modulated in that stronger assist support is controlled with a larger wrap angle, whereas weaker assist support is controlled with a smaller wrap angle. In addition to the thread tension, the wrap angle serves as a control variable for the slip.

Wenn der Umschlingungswinkel annähernd 90° beträgt, wird als zusätzlicher Vorteil die bisher bei wie üblich vertikaler Spule und horizontaler Fadenspeicher- und -liefervorrichtung erforderliche Fadenumlenkung von der Spule zum Speicher gleich vom Friktionsantrieb übernommen (Anspruch 5). Die Friktionsrolle kann leicht und trägheitsarm sein und ist rasch auf die nötige Geschwindigkeit beschleunig- und auch wieder verzögerbar. Von der Spule stammende Fadenzupfer kompensiert die Friktionsrolle.If the wrap angle is approximately 90 °, the thread deflection from the bobbin to the memory, which was previously required in the usual vertical bobbin and horizontal thread storage and delivery device, is taken over by the friction drive as an additional advantage (claim 5). The friction roller can be light and low inertia and can be quickly accelerated and decelerated to the required speed. Thread plucking from the bobbin compensates for the friction roller.

Die Kupplung gemäß Anspruch 6 bewirkt, daß der Faden mit der Friktionsrolle auch ohne deren direkten Antrieb laufen kann, wenn dies unter bestimmten Betriebsbedingungen günstig ist. Insbesondere in der Auslaufphase wird der Faden über die eingerückte Kupplung und die abfallende Antriebsgeschwindigkeit sauber abgebremst, was das Nachlaufen des Fadens aufgrund seiner Masse und somit eine unerwünschte überzufuhr zumindest weitgehend unterbindet.The clutch according to claim 6 causes the thread with the friction roller can also run without its direct drive if this is favorable under certain operating conditions. In the run-down phase in particular, the thread is pulled over the engaged clutch and the falling drive speed braked clean, which at least largely prevents the thread from running on due to its mass and thus an undesirable transfer.

Bei der Alternative gemäß Anspruch 7 läßt sich mit der Bremseinrichtung die Friktionsrolle rasch abbremsen oder beim Arbeiten gezielt und moduliert bremsen und eine gewünschte Fadenspannung erzeugen. Gegebenenfalls ist dann auch ein in einer Richtung sperrender Freilauf vorgesehen.In the alternative according to claim 7, the friction roller can be braked quickly with the braking device or can be braked specifically and modulated when working and generate a desired thread tension. If necessary, a one-way locking freewheel is then also provided.

Der speziell ausgewählte Oberflächenbelag der Friktionsrolle gemäß Anspruch 8 bestimmt den Schlupf des Fadens mit. In Anpassung an die Fadenqualität können axial nebeneinander unterschiedliche Oberflächenbeläge vorgesehen sein, von denen der jeweils passende benutzt wird.The specially selected surface covering of the friction roller according to claim 8 also determines the slippage of the thread. In adaptation to the thread quality, different surface coverings can be provided axially next to one another, of which the appropriate one is used.

Wichtig ist die Ausführungsform gemäß Anspruch 9, weil die Geschwindigkeits-Steuereinheit die genaue Steuerung des Friktionsantriebs in Abhängigkeit von der von der Fadenspeicher- und -liefervorrichtung bestimmten Fadengeschwindigkeit vornimmt. Es ist aber auch denkbar, den Friktionsantrieb eigenständig anzutreiben, und die tatsächliche Fadengeschwindigkeit nur über die Modulation der Einwirkung, z.B. durch den Schlupf, zu regeln. Auch besonders empfindliche oder schwache Fäden lassen sich so mit großer Geschwindigkeit bruchsicher verarbeiten.The embodiment according to claim 9 is important because the speed control unit carries out the precise control of the friction drive as a function of the thread speed determined by the thread storage and delivery device. However, it is also conceivable to drive the friction drive independently, and the actual thread speed can only be achieved by modulating the action, e.g. through the slip to regulate. Even particularly sensitive or weak threads can be processed unbreakable at high speed.

Mit dem Verfahren gemäß Anspruch 10 wird eine gleichmäßige Anpassung der Fadengeschwindigkeit für die Fadenspeicher- und -liefervorrichtung erreicht. In der Fadenspeicher- und -liefervorrichtung bricht der Faden selbst bei hoher Geschwindigkeit und relativ scharfer Umlenkung nicht mehr. Der bewußt eingesteuerte Geschwindigkeitsunterschied bewirkt den Schlupf, der zur Assistförderung (Bremsen oder Beschleunigen) benötigt wird.With the method according to claim 10, a uniform adaptation of the thread speed for the thread storage and delivery device is achieved. In the thread storage and delivery device, the thread no longer breaks even at high speed and relatively sharp deflection. The deliberately controlled Difference in speed causes the slippage that is needed to assist the assist (braking or accelerating).

Regelungstechnisch einfach ist die Verfahrensvariante gemäß Anspruch 11. Von Anfang an wird mit zunehmendem Schlupf gefördert.The process variant according to claim 11 is simple in terms of control technology. From the beginning, the increase in slip increases.

Gemäß Anspruch 12 ist der Arbeitsbereich in mehrere aneinander anschließende Bereiche unterteilt. Im ersten Bereich wird der Faden, z.B. in der Auslaufphase der Fadenspeicher- und -liefervorrichtung zwecks Unterbindung eines Nachlaufs gebremst, weil der Friktionsantrieb langsamer läuft als der Faden oder stillsteht. Im nächsten Bereich kann der Friktionsantrieb von seinem Antrieb abgekuppelt sein, der Faden ist dann dem mechanischen Bewegungswiderstand des Friktionsantriebs ausgesetzt, was Spannungsschwankungen unterdrückt. Im darauffolgenden Bereich steht durch den schneller als der Faden angetriebenen Friktionsantrieb eine überschußgeschwindigkeit zur Verfügung, die der Faden mit Schlupf bei Bedarf zumindest zum Teil aufnimmt. Die exakt dosierbare Assistförderung unterdrückt auch in diesem Geschwindigkeitsbereich Spannungsschwankungen im Faden.According to claim 12, the work area is divided into several adjoining areas. In the first area, the thread, e.g. braked in the phase-out phase of the thread storage and delivery device to prevent overrun, because the friction drive runs slower than the thread or stands still. In the next area, the friction drive can be uncoupled from its drive, the thread is then exposed to the mechanical resistance to movement of the friction drive, which suppresses tension fluctuations. In the next area, the friction drive, which is driven faster than the thread, provides an excess speed that the thread with slippage absorbs at least in part if necessary. The precisely metered assist delivery also suppresses tension fluctuations in the thread in this speed range.

Gemäß Anspruch 13 bremst die Assistförderung im Bereich niedriger Fadengeschwindigkeit, während sie bei höherer Fadengeschwindigkeit nachschiebt.According to claim 13, the assist promotion brakes in the area of low thread speed, while it feeds at higher thread speed.

Anhand der Zeichnung werden Ausführungsformen des Erfindungsgegenstandes erläutert. Es zeigen:

Fig. 1
schematisch eine Fadenliefervorrichtung mit einer Hilfsvorrichtung,
Fig. 2
diagrammartig eine Fadengeschwindigkeitskurve, und
Fig. 3,4a,4b
verschiedene Geschwindigkeitsdiagramme.
Embodiments of the subject matter of the invention are explained with the aid of the drawing. Show it:
Fig. 1
schematically a thread delivery device with an auxiliary device,
Fig. 2
a thread speed graph, and
3,4a, 4b
different speed diagrams.

Bei einer Liefervorrichtung 1 für einen Faden Y zu einer Textilmaschine 2, z.B. einer Luftdüsen-Webmaschine, ist eine Eintragvorrichtung 3, z.B. eine Luftdüse, zur Textilmaschine vorgesehen. Der Eintragvorrichtung 3 sind ein Fadenauge 5 und eine Fadenspeicher- und -liefervorrichtung 4 vorgesetzt, die, falls ein Längenabschnitte bemessener Schußfaden verarbeitet werden soll, eine Meßvorrichtung für die jeweils ausgegebene Schußfadenlänge aufweisen kann. Stromauf der Fadenspeicher- und -liefervorrichtung 4 ist eine weitere Fadenöse 6 vorgesehen. Ein mit einer nicht gezeigten Steuerung verbundener Antriebsmotor 7 der Fadenspeicher- und -liefervorrichtung treibt ein Aufwickelelement 18, das den Faden Y auf einer Speicherfläche 19 aufwickelt. Bei diesem Typ der Fadenspeicher- und -liefervorrichtung 4 tritt im Bereich 20 eine signifikante Fadenumlenkung auf, die bei hoher Fadengeschwindigkeit Ursache für Fadenbrüche sein kann.In a delivery device 1 for a thread Y to a textile machine 2, e.g. an air jet weaving machine, is an insertion device 3, e.g. an air nozzle provided to the textile machine. The insertion device 3 is preceded by a thread eye 5 and a thread storage and delivery device 4, which, if a weft thread of dimensioned length is to be processed, can have a measuring device for the weft thread length respectively output. A further thread eyelet 6 is provided upstream of the thread storage and delivery device 4. A drive motor 7 of the thread storage and delivery device connected to a controller (not shown) drives a winding element 18, which winds the thread Y on a storage surface 19. With this type of thread storage and delivery device 4, a significant thread deflection occurs in the area 20, which can cause thread breaks at high thread speeds.

Der Faden Y kommt von einer Fadenvorratsvorrichtung 8, beispielsweise einer konischen Spule 9, auf der er, z.B. mit wechselnder Richtung überkreuzend, aufgewickelt ist. Zwischen der Spule 9 und der Fadenöse 6 ist eine Hilfsvorrichtung 10 angeordnet, zweckmäßigerweise nahe an der Spule 9. Die Hilfsvorrichtung 10 ist ein Friktionsantrieb R mit einer Friktionsrolle 11, z.B. mit reibungsaktiver Oberfläche. Die Friktionsrolle 11 steht mit einem verstellbaren Antrieb 12, z.B. einem Schrittmotor, in Antriebsverbindung. Die Steuerung des Antriebs 7 der Fadenspeicher- und -liefervorrichtung 4 ist über eine Leitung 16 an eine Steuereinheit 15 angeschlossen, die über die Fadengeschwindigkeit informiert ist. über eine Leitung 17 kann auch der Antrieb 12 an die Steuereinheit 15 angeschlossen sein.The thread Y comes from a thread supply device 8, for example a conical bobbin 9, on which it is wound, for example crossing with changing direction. An auxiliary device 10 is arranged between the bobbin 9 and the thread eyelet 6, expediently close to the bobbin 9. The auxiliary device 10 is a friction drive R with a friction roller 11, for example with a frictionally active surface. The friction roller 11 is with an adjustable drive 12, for example one Stepper motor, in drive connection. The control of the drive 7 of the thread storage and delivery device 4 is connected via a line 16 to a control unit 15 which is informed of the thread speed. The drive 12 can also be connected to the control unit 15 via a line 17.

Zwischen dem Antriebsmotor 12 und der Friktionsrolle 11 kann - falls nicht eine direkte Antriebsverbindung vorliegt - eine gesteuert lös- und einrückbare, ggfs. modulierbare, Kupplung 13 eingeordnet sein, die es in gelöstem Zustand der Friktionsrolle 11 ermöglicht, schneller oder langsamer zu laufen als der Antriebsmotor 12. Zusätzlich könnte auch eine modulierbare Bremsvorrichtung für die Friktionsrolle 11 vorgesehen sein. Gegebenenfalls ist dann anstelle der Kupplung 13 ein nur in Antriebsrichtung sperrender Freilauf vorgesehen.If the drive motor 12 and the friction roller 11 are not provided with a direct drive connection, a clutch 13 that can be released and engaged, possibly modulated, can be arranged, which, when released, enables the friction roller 11 to run faster or slower than that Drive motor 12. In addition, a modular braking device for the friction roller 11 could also be provided. If necessary, instead of the clutch 13, a freewheel that only locks in the drive direction is provided.

Die Spule 9 steht senkrecht; die Fadenspeicher- und -liefervorrichtung 4 hingegen annähernd waagrecht. An der Friktionsrolle 11 wird der Faden 4 mit einem Umschlingungswinkel α von annähernd 90° umgelenkt. Der Winkel α kann verstellt werden.The coil 9 is vertical; the thread storage and delivery device 4, however, approximately horizontal. The thread 4 is deflected on the friction roller 11 with a wrap angle α of approximately 90 °. The angle α can be adjusted.

Die Eintragvorrichtung 3 zieht von der Fadenspeicher- und -liefervorrichtung 4, z.B. in der Länge exakt vorbestimmte, Fadenabschnitte ab. Der Antriebsmotor 7 hält in Abhängigkeit vom Verbrauch der Textilmaschine 2 ständig einen Fadenvorrat in der Fadenspeicher- und -liefervorrichtung 4 aufrecht und zieht den Faden Y von der Spule 9 ab. Dies erfolgt so, daß der Faden praktisch kontinuierlich läuft. Dem Abziehen des Fadens Y von der Spule 9 stehen ein bestimmter Abwickelwiderstand sowie ggfs. Spannungspitzen bei Wickelrichtungsänderungen (Fadenzupfer) entgegen.The entry device 3 pulls off the thread storage and delivery device 4, for example length sections which are exactly predetermined in length. Depending on the consumption of the textile machine 2, the drive motor 7 constantly maintains a thread supply in the thread storage and delivery device 4 and pulls the thread Y from the bobbin 9. This is done so that the thread runs practically continuously. The pulling of the thread Y from the bobbin 9 is opposed by a certain unwinding resistance and possibly tension peaks when the winding direction changes (thread plucking).

Die Hilfsvorrichtung 10 assistiert beim Fördern des Faden Y mit der von der Fadenspeicher- und -liefervorrichtung benötigten Geschwindigkeit oder bremst ihn so, daß Aenderungen der Spannung im Faden Y gering bleiben. Spannungsschwankungen aufgrund wechselnder Wickelrichtung (Fadenzupfer) auf der Spule 9 werden von der Hilfsvorrichtung 10 kompensiert oder ausgefiltert und sind im Bereich 20 der Fadenumlenkung in der Vorrichtung 4 fast nicht mehr spürbar.The auxiliary device 10 assists in conveying the yarn Y at the speed required by the yarn storage and delivery device or brakes it so that changes in the tension in the yarn Y remain small. Tension fluctuations due to changing winding direction (thread plucking) on the bobbin 9 are compensated or filtered out by the auxiliary device 10 and are almost no longer noticeable in the area 20 of the thread deflection in the device 4.

Die exakte Steuerung des Antriebsmotors 12 bzw. der Friktionsrolle 11 in Anpassung an die Geschwindigkeit in der Fadenspeicher- und -liefervorrichtung 4 ist besonders wichtig, weil damit der Geschwindigkeitseinfluß (Reibung) bei der scharfen Umlenkung des Fadens, z.B. am Auslaß des Aufwickelelements 18, eliminiert wird. Zusammengefaßt werden im Bereich 20 eine zu große Fadenspannung und gefährliche Spannungsänderungen durch die Assistförderung weitgehend vermieden, Faktoren also, die eine vermutete Ursache für dort auftretende Fadenbrüche waren.The exact control of the drive motor 12 or the friction roller 11 in accordance with the speed in the thread storage and delivery device 4 is particularly important because it influences the speed (friction) during the sharp deflection of the thread, e.g. at the outlet of the winding element 18 is eliminated. In summary, excessive thread tension and dangerous changes in tension are largely avoided in area 20 by the assistance promotion, ie factors that were a suspected cause of thread breaks occurring there.

Gemäß Fig. 2 bleibt die Fadengeschwindigkeit KY im gesamten Arbeitsbereich unterhalb der Umfangsgeschwindigkeit KR des Friktionsantriebs. Beide Geschwindigkeitskurven sind idealisiert als Geraden mit verschiedenen Anstiegen dargestellt. Zwischen dem Faden und dem Friktionsantrieb stellt sich ein mit steigender Fadengeschwindigkeit zunehmender Schlupf ein, damit der Friktionsantrieb stets nachschieben kann, wenn dies die Fadenspeicher- und -liefervorrichtung 4 verlangt.According to FIG. 2, the thread speed KY remains below the peripheral speed KR of the friction drive in the entire working area. Both speed curves are idealized as straight lines with different increases. Between the thread and the friction drive, an increasing slip occurs with increasing thread speed, so that the friction drive can always push when the thread storage and delivery device 4 requires it.

Gemäß Fig. 3 ist der Arbeitsbereich der Fadenspeicher- und -liefervorrichtung 4, d.h. die Kurve KY der Fadengeschwindigkeit VY ist in drei Bereiche A, B, C unterteilt. Der Bereich A reicht bis zu einem relativ niedrigen Geschwindigkeitsreferenzwert a; der Bereich B von a bis zu einem höheren Geschwindigkeitsreferenzwert b; der Bereich C von b bis zum höchsten Geschwindigkeitsreferenzwert c (max. Fadengeschwindigkeitswert VYmax). Im Bereich A wird der Faden durch den ggfs. stehenden Friktionsantrieb abgebremst. Die Kupplung ist dabei eingerückt. Dies ist besonders in der Auslaufphase wichtig. Im Bereich B ist die Kupplung gelöst. Der Friktionsantrieb dreht frei mit dem Faden; aufgrund des Drehwiderstandes des Friktionsantriebs tritt Schlupf auf. Im Bereich C wird der Friktionsantrieb mit positivem Geschwindigkeitsüberschuß angetrieben, die Kupplung ist eingerückt. Der Faden wird mit Schlupf gefördert. Bei einer Steigerung der Fadenspannung nehmen der Schlupf ab und die Assistförderung zu bzw. umgekehrt. Wiederum wird die Spannung relativ niedrig und gleichmäßig gehalten. Es ergibt sich eine unstetige Geschwindigkeitskurve KR für den Friktionsantrieb, wobei die Kurve KR in Fig. 3 übertrieben bzw. idealisiert ist.3 is the working area of the thread storage and delivery device 4, ie the curve KY of the thread speed VY is divided into three areas A, B, C. Area A ranges up to a relative low speed reference value a; the range B from a to a higher speed reference value b; the range C from b to the highest speed reference value c (max. thread speed value VYmax). In area A, the thread is braked by the friction drive, which may be stationary. The clutch is engaged. This is particularly important in the phase-out phase. In area B the clutch is released. The friction drive turns freely with the thread; slip occurs due to the rotational resistance of the friction drive. In area C, the friction drive is driven with a positive excess speed, the clutch is engaged. The thread is fed with slip. When the thread tension increases, the slip decreases and the assisted support increases or vice versa. Again, the tension is kept relatively low and even. The result is an inconsistent speed curve KR for the friction drive, the curve KR in FIG. 3 being exaggerated or idealized.

Gemäß Fig. 4a, 4b ist ein Referenzgeschwindigkeitswert d entlang der Kurve KY, z.B. in Abhängigkeit von der Fadenqualität, ausgewählt, so daß zwei Bereiche D, E vorliegen. Mit steigender Fadengeschwindigkeit VY wird im Bereich D der Friktionsantrieb langsamer als der Faden angetrieben, bis die Friktionsantriebskurve KR im Punkt d die Kurve KY überkreuzt. Im Bereich E wird der Friktionsantrieb mit zunehmendem Geschwindigkeitsüberschuß angetrieben. Die Kurve KR kann idealisiert eine Gerade (Fig. 4a) oder eine flache S-Kurve (Fig. 4b) mit dem Wendepunkt im Punkt d sein. Unter besonderen Betriebsbedingungen könnte der Friktionsantrieb auch mit der Fadenbewegung entgegengesesetzter Richtung angetrieben werden, um absichtlich eine noch stärkere Bremsung zu erzeugen.4a, 4b, a reference speed value d along the curve KY, e.g. depending on the thread quality, selected so that there are two areas D, E. With increasing thread speed VY, the friction drive in area D is driven more slowly than the thread until the friction drive curve KR crosses curve KY at point d. In area E, the friction drive is driven with increasing excess speed. The curve KR can ideally be a straight line (FIG. 4a) or a flat S curve (FIG. 4b) with the turning point at point d. Under special operating conditions, the friction drive could also be driven with the thread movement in the opposite direction in order to intentionally generate an even stronger braking.

Claims (13)

  1. Thread-delivery device for a textile machine (2), especially for an air-jet weaving machine, with a thread-storage and thread-delivery device (4) between a thread-supply device (8) and the shooting-in device (3) of the textile machine, and with an auxiliary device (10) arranged in the thread path from the thread-supply device to the thread-storage and thread-delivery device, characterized in that the auxiliary device (10) has a slip-friction drive (R) for the thread (Y).
  2. Thread-delivery device according to Claim 1, characterized in that the effect of the friction drive (R) on the thread (Y) can be modulated.
  3. Thread-delivery device according to Claims 1 and 2, characterized in that the friction drive (R) has its own drive (12), and its effect on the thread (Y) can be modulated at least by the thread tension, generated in the thread (Y) by the thread-storage and thread-delivery device (4), between the thread-storage and thread-delivery device (4) and the thread-supply device (8).
  4. Thread-delivery device according to Claims 1 to 3, characterized in that the friction drive (R) for the thread (Y) has a contact region of predetermined length (for example, a looping angle (α), and in that the contact region can be varied for modulation.
  5. Thread-delivery device according to Claims 1 to 4, characterized in that the friction drive (10) has a friction roller (11) which is drive-connected to the preferably adjustable drive (12), and in that the thread is deflected on the surface of the friction roller.
  6. Thread-delivery device according to Claim 5, characterized in that a releasable and/or modulatable coupling (13) is provided between the friction roller (11) and the drive (12).
  7. Thread-delivery device according to Claims 1 to 5, characterized in that a modulatable braking device is provided for the friction roller (11).
  8. Thread-delivery device according to Claims 1 to 7, characterized in that axially limited surface coverings of differing slip capacity are located next to one another on the surface of the friction roller (11).
  9. Thread-delivery device according to Claims 1 to 8, characterized in that the drive (12) of the friction roller (11) is connected to a speed-control unit (15) connected to a speed control for the thread-storage and thread-delivery device (4) and can be controlled in dependence on the thread speed in the thread-storage and thread-delivery device (4).
  10. Method for driving a thread, drawn off from a supply device, by means of an auxiliary device arranged between the supply device and a thread-storage and thread-delivery device, characterized in that, in a friction drive (10) forming the auxiliary device, the surface speed (KR) of the friction drive (10) is selected different from the thread speed (KY) in the thread-storage and thread-delivery device (4), and in that the thread (Y) is conveyed on the surface with a slip which is maintained during the conveyance.
  11. Method according to Claim 10, characterized in that the speed difference and the slip are increased approximately continuously with an increasing thread speed.
  12. Method according to Claim 10, in which the thread speed in the thread-storage and thread-delivery device is variable in a predetermined range up to a maximum value, characterized in that, within the range, a plurality of reference speed values (a, b, c) are selected as switching points for the speed-control unit (12) of the friction drive, and in that the friction drive brakes the thread positively in a first range limited by the reference speed value (a), in that, in a further range located between the reference speed values (a, b), the friction drive is uncoupled from its drive and runs freely rotatably together with the thread, and in that, from the further reference speed value (b) and, if appropriate, up to the highest reference speed value (c), the friction drive is driven at an increasing thread speed with an increasing positive speed difference and conveys the thread with slip.
  13. Method according to Claim 10, in which the thread speed in the thread-storage and thread-delivery device is variable in a predetermined range up to a maximum value, characterized in that, within the range, a reference speed value (d) preferably adapted to the thread quality is selected, and the friction drive is driven more slowly than the thread up to the reference speed value (d), and in that, from the moment when the reference speed value (d) is reached, the friction drive is driven increasingly faster than the thread speed, in such a way that the curve of the friction-drive speed intersects the thread-speed curve in an approximately straight or slightly S-shaped manner.
EP90900833A 1988-12-31 1989-12-29 Yarn feed device Expired - Lifetime EP0451176B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8900006 1988-12-31
SE19898900006A SE8900006D0 (en) 1988-12-31 1988-12-31 DEVICE AT A YARN STORAGE AND FEEDING UNIT FOR TEXTILE MACHINES

Publications (2)

Publication Number Publication Date
EP0451176A1 EP0451176A1 (en) 1991-10-16
EP0451176B1 true EP0451176B1 (en) 1993-11-18

Family

ID=20374663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90900833A Expired - Lifetime EP0451176B1 (en) 1988-12-31 1989-12-29 Yarn feed device

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US (1) US5385310A (en)
EP (1) EP0451176B1 (en)
JP (1) JP3141137B2 (en)
KR (1) KR0140237B1 (en)
DE (1) DE58906222D1 (en)
SE (1) SE8900006D0 (en)
WO (1) WO1990007600A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH685778A5 (en) * 1991-05-24 1995-09-29 Rueti Ag Maschf Appts. for supplying pick to pick inserter
KR100307849B1 (en) * 1992-12-03 2001-11-30 브롬 스티그-아르네 Thread feeder
DE4324160A1 (en) * 1993-07-19 1995-01-26 Iro Ab Entry system for a jet loom
DE19841699A1 (en) * 1998-09-11 2000-03-16 Iro Patent Ag Yarn treatment assembly has impregnation and associated attachments at yarn feed apparatus with a linked sensor to monitor unused rotating magnetic fields
DE19942121A1 (en) * 1999-09-03 2001-03-08 Iro Patent Ag Baar Method for controlling a thread processing system and thread processing system
WO2012174514A1 (en) * 2011-06-16 2012-12-20 American Linc, Llc Overfeed roller assembly, textile, and method of adjusting tension in a running yarn

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT312146B (en) * 1967-09-13 1973-12-27 Morat Gmbh Franz Thread feed on a knitting machine
CH454697A (en) * 1967-09-26 1968-04-15 Schaerer Maschf Thread delivery system
GB1262179A (en) * 1968-10-14 1972-02-02 Rosen Karl I J Thread storage and delivery device for textile machines
US3831873A (en) * 1970-05-26 1974-08-27 Leesona Corp Take-up system
FR2278817A1 (en) * 1974-07-17 1976-02-13 Inst Textile De France WIRE FEEDING DEVICE FOR KNITTING TRADE
JPS6032041Y2 (en) * 1978-11-07 1985-09-25 帝人株式会社 Yarn processing roller
US4403634A (en) * 1980-04-01 1983-09-13 Sulzer Brothers Limited Weft yarn storage device for weaving machines
DE3412550A1 (en) * 1984-04-04 1985-10-17 SIPRA Patententwicklungs- und Beteiligungsgesellschaft mbH, 7470 Albstadt DEVICE FOR POSITIVE THREAD DELIVERY TO TEXTILE MACHINES
DE3437252C1 (en) * 1984-10-11 1986-01-16 Gustav 7290 Freudenstadt Memminger Thread storage and delivery device, in particular for textile machines

Also Published As

Publication number Publication date
EP0451176A1 (en) 1991-10-16
JP3141137B2 (en) 2001-03-05
WO1990007600A1 (en) 1990-07-12
KR910700371A (en) 1991-03-15
DE58906222D1 (en) 1993-12-23
JPH04502652A (en) 1992-05-14
US5385310A (en) 1995-01-31
SE8900006D0 (en) 1988-12-31
KR0140237B1 (en) 1998-07-01

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