EP1492911B9 - Vorrichtung und methode zur belieferung einer textilmaschine mit einem elastomeren garn - Google Patents

Vorrichtung und methode zur belieferung einer textilmaschine mit einem elastomeren garn Download PDF

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Publication number
EP1492911B9
EP1492911B9 EP03745773A EP03745773A EP1492911B9 EP 1492911 B9 EP1492911 B9 EP 1492911B9 EP 03745773 A EP03745773 A EP 03745773A EP 03745773 A EP03745773 A EP 03745773A EP 1492911 B9 EP1492911 B9 EP 1492911B9
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EP
European Patent Office
Prior art keywords
yarn
speed
textile machine
tension
fed
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Expired - Lifetime
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EP03745773A
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English (en)
French (fr)
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EP1492911A1 (de
EP1492911B1 (de
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Tiziano Barea
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
    • D04B35/12—Indicating, warning, or safety devices, e.g. stop motions responsive to thread consumption
    • 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
    • D04B15/50—Thread-feeding devices for elastic threads

Definitions

  • the present invention relates to a device for feeding an elastomeric yarn to a textile machine with the aim of obtaining an article of constant quality in all its parts, in accordance with the introduction to the main claim.
  • the present invention also relates to a method implemented by said device in accordance with the introduction to the corresponding independent claim.
  • yarn feeders In the textile industry, devices known as yarn feeders are used basically for feeding yarn to the textile machine under conditions either of "constant quantity” or of “constant tension”.
  • the first are composed of mechanical members or electronic actuators, electric motors of various kind able to feed the yarn at a speed synchronized with the operative speed of the textile machine in each of its productive stages. In this manner the parameter relative to the "quantity of yarn" fed during the productive process is maintained constant in each of said operative stages, the machine hence operating under "constant quantity” tension feed conditions.
  • These devices are also used to feed an elastomeric yarn for example in large-diameter circular knitting machines; such devices are composed of a pulley synchronized with the main transmission shaft of the textile machine by means of a belt, the elastomeric yarn resting on said pulley which by rotating enables the yarn fed to the textile machine to be unwound in a controlled manner.
  • Other devices of this type are for example those used to feed a controlled quantity of elastomeric yarn during its processing within a circular textile machine for producing stockings, tights etc. These devices normally use a yarn feed roller or pulley operated by electric motors synchronized with the rotational speed of the cylinder of the textile machine, to ensure a yarn feed of controlled or variable quantity depending on the processing stage reached.
  • These devices are composed of a yarn tension sensor connected to a measurement and processing circuit, able to provide "closed-loop” control of a motor acting on a roller or pulley operating directly on the yarn in order to feed it under "constant tension” feed conditions.
  • Such a device is known, for example, from EP950742 relating to a device for controlling the feed of a yarn fed to a textile machine such as a knitting machine, stocking machine or a bobbin winder; the yarn possesses an intrinsic tension and is fed to the machine with an intrinsic speed, means being provided for sensing this tension and means for measuring this speed.
  • the sensing and measuring means are both associated with the body of the device and are both connected to control and regulator means for said tension and speed parameters, these control and regulator means continuously measuring the values of both said parameters during the yarn feed to the textile machine and comparing at least one of them with a predetermined homogeneous datum in order to also establish with precision the value of the other parameter.
  • speed measurement means are associated with motor means enabling the speed of the fed yarn to be modified on the basis of the sensed tension value, said motor means being the textile machine with which the rotary member is associated via known mechanical transmission members.
  • motor means are connected to the control means defined by a microprocessor unit, this latter being connected to the textile machine control member, by which it operates on the motor means acting on the speed measurement means.
  • these devices represent a considerable forward step with regard to the quality of the fabric or article produced by the textile machine to which they are applied, they can no longer be considered as sufficient for satisfying the requirement for continuous increase in the quality of the textile article produced by elastomeric yarn.
  • said devices feed the yarn at constant tension and are hence able to react actively to any variation in the tension of the yarn unwinding from the bobbin, they are not able to ensure an effective "constant quantity" because of the elongation of the yarn as a function of its bobbin unwinding tension.
  • an elastomeric yarn originating from a yarn bobbin which is still full has an unwinding tension less than and hence an elongation less than an elastomeric yarn originating from a yarn bobbin which is at least partly empty.
  • GB2162971 Another device of the aforesaid type is described in GB2162971 which relates to a device for feeding a yarn to a textile machine such as a knitting machine, a loom or the like.
  • This device comprises a yarn feed member controlled by an electric guide motor of controlled speed, said speed being controlled by an output signal which controls the speed of movement of the yarn.
  • the speed of the guide motor is synchronized with said output signal, representative of the yarn feed speed.
  • Tensioning means are provided to automatically maintain the yarn tension at a preselected value.
  • An object of the present invention is therefore to provide an improved device and method for feeding an elastomeric yarn to a textile machine with the aim of obtaining an article of excellent and constant quality.
  • FIG. 1 shows a device 1 for feeding an elastomeric yarn 11 at "constant tension" to a textile machine 10.
  • This device indicated by DTC in Figure 4 , comprises a body 2 (for example box-like). With this body there are associated a grooved wheel or pulley 3 associated with an actuator (not shown) for its movement.
  • This actuator can be an electric motor (for example of brushless type) associated with that face of the body 2 opposite the face 6 on which the pulley 3 is present.
  • Such a device 1 is associated with each elastomeric yarn 11 fed to the machine, said yarn unwinding from a bobbin B and winding one or more times about the pulley 3.
  • This pulley is directly or indirectly connected to a member 12 which measures its rotation and hence the speed of this rotation.
  • This member can be a magnetic sensor 13 associated with the body 2 and cooperating with a magnet 15 associated with the pulley or a known Hall sensor associated with the motor (brushless motor with a Hall sensor incorporated) which provides the movement of the pulley 3.
  • the body 2 also supports a member 18 for measuring the tension of the yarn 11 directed to the machine 10; this member is of known type and can comprise a usual magnetic sensor, a piezoelectric sensor, a load cell, an elastically supported armlet or another known sensor.
  • the tension sensing member 18, the measurement member 13 for the rotational speed of the pulley and the motor connected to this latter are connected to a unit 20 for controlling and regulating the feed of the yarn 11 to the textile machine 10.
  • this unit 20 is associated with the device 1 (inserted into its body 2) and is able, via the connection to said measurement members, to measure correctly and precisely the quantity of yarn (in metres per minute) fed to the machine, using evaluation algorithms which consider both the measured tension of the yarn 11 and the speed of rotation of the pulley.
  • This member 30 is able to compensate the physical variation in the diameter of the yarn 11 as the diameter of the bobbin from which it unwinds decreases, and to maintain its elongation, and hence the quantity of yarn fed to the textile machine 10, constant.
  • the member 30 comprises a wheel means 31 supported laterally by an actuator 33, for example electrical (such as an electric motor for example of brushless type or similar) or air operated, which rotates it about its axis.
  • This wheel means presents a groove 31A in which the yarn 11 is wound and acts as a braking member or a member for feeding the yarn to the DTC device 1.
  • the actuator 33 is connected (see Figure 3 ) to a control unit such as a microprocessor 34 (for example associated with said motor as in Figure 2 ) connected to the unit 20 of said device.
  • the unit 20 and the unit 34 exchange data relative to the speed at which the yarn 11 is fed to the textile machine 10, to enable the speed of the wheel means 31 to be varied so as to induce a corresponding correction to the speed of the yarn leaving the device 1 (via the pulley 3) and then to maintain the speed of the yarn 11 or the quantity of said yarn fed to the machine 10 constant.
  • the unit 20 can also cooperate with a control unit 27 for the textile machine 10.
  • the wheel means 31 either brakes or feeds more yarn to the device 1 on the basis of a desired set yarn speed (or quantity) (indicated by SPV in Figure 4 ).
  • This setting can be in the form of:
  • the method of the invention operates in accordance with the following procedure: after start-up (block 40), the yarn feed speed is measured (block 41) by the DCT device 1; the speed (SPV for example equal to 50 m/min) set in the unit 34 (block 42) is compared with the measured speed. If the yarn feed speed via the DCT device 1 is greater than the speed SPV, the unit 34 acts on the wheel means 31 to decrease the amount of yarn braking (block 43) and draw more yarn 11 from the bobbin B so that the DCT device operates at the speed set in the unit 34 with its own pulley 3.
  • the speed for example equal to 50 m/min
  • the unit 34 controlling the wheel means 31 increases the amount of braking of the yarn 11 (block 44). These braking increase/decrease adjustments by the wheel means 31 and consequently by the pulley 3 are repeated until the DCT device 1, which is feeding the yarn 11 at "constant tension", has been compelled to attain a yarn feed speed equal to the speed set and programmed in the unit 34.
  • the speed value SPV can be varied in relation with the operative stage achieved by the textile machine, in order to obtain a variable yarn pretension value based on the processing point.
  • DTC device 1 could easily accommodate the member 30 of the present invention, hence advantageously forming a single device for yarn feed at "constant tension and quantity”.
  • the yarn pre-feed actuator or wheel means 31 could be of different form than that described: for example in the form of a known braking device, or a pulley or roller directly or indirectly keyed onto the shaft of the actuator 33 to act on the pre-feed so that more or less yarn is fed, with the purpose of compelling the DCT device 1 to feed the elastomeric yarn at "constant tension and quantity”.
  • a device for feeding an elastomeric yarn to a textile machine which acts on the yarn before it passes to the textile machine, such that the elastic characteristics of the yarn do not influence or cannot be seen to influence the production of the article.
  • the device of the invention with a member for compensating the variation in the diameter and elongation of the elastomeric yarn before it cooperates with a known device for feeding this yarn at constant tension and quantity.
  • the said compensation member acts on the yarn to brake it or to increase the speed with which it is unwound from the bobbin (i.e. by removing more yarn from the bobbin) on the basis of a yarn withdrawal speed by said device which, in its turn, responds to a request for yarn by the textile machine.
  • This braking or acceleration of the yarn directed to the known device for feeding the yarn at constant tension and quantity prevents said yarn being able to leave this device with variations in its physical elongation and diameter (even if at constant tension) such as to result in the production of an article of imperfect appearance: in the absence of the compensator member, said yarn when combined with another yarn of unvaried physical characteristics would give rise to an article in which the different elongation and diameter of the yarns would be recognizable. This does not happen if the aforesaid compensator member is present, this enabling the yarn to be "processed" by the feed device as if the yarn were without elasticity.
  • said member enables the yarn to absorb the elongation and diameter variation occurring on its withdrawal from the bobbin before entering the feed device; in other words, the yarn returns to its pre-stretch conditions at the moment in which its tension is evaluated by the DTC device.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Knitting Machines (AREA)
  • Looms (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (11)

  1. Vorrichtung zum Anpassen der Zufuhr eines elastomeren Garns (11) mit bekannten elastischen Eigenschaften, welches von einer Garnspule (B) abgezogen und einer Textilmaschine (10), wie einer Strickmaschine, einer Strumpfmaschine, einem Spuler oder einer anderen Textilmaschine, zugeführt wird, wobei das Garn eine intrinsische Elastizität aufweist und der genannten Maschine mit einer intrinsischen Geschwindigkeit zugeführt wird, wobei Mittel (18) zum Bestimmen der Spannung des Garns (11) und Mittel (3, 12) zum Messen und Modifizieren dieser Geschwindigkeit vorgesehen sind, wobei die Bestimmungsmittel (18) und die Mess- und Modifiziermittel (3, 12) jeweils mit Mitteln (20) zum Steuern und Regulieren der Spannungs- und Geschwindigkeitsparameter verbunden sind, wobei die Steuer- und Reguliermittel (20) kontinuierlich die Werte der beiden genannten Parameter während dem Zuführen des Garns (11) zu der Textilmaschine messen,
    dadurch gekennzeichnet,
    dass die Vorrichtung weiterhin Kompensatormittel (30) aufweist, welche dazu ausgebildet sind, die Variationen der Abmessungseigenschaften des elastomeren Garns (11), welches von der Garnspule (B) abzogen wird, zu kompensieren, bevor das Garn (11) mit den Spannungsbestimmungsmitteln (18) und mit den Geschwindigkeitsmessmitteln (3, 12) zusammenwirkt, um die Zufuhr eines Garns mit gleich bleibenden Abmessungseigenschaften zu der Textilmaschine (10) während der gesamten Dauer der Herstellung eines Gegenstands zu ermöglichen, und dass die Kompensatormittel (30) ein Element (31) umfassen, welches in Kontakt mit dem Garn ist und welches dazu ausgebildet ist, bei Bedarf dessen Bewegungsgeschwindigkeit auf dessen Weg von der Garnspule (B) zu den Spannungsbestimmungsmitteln (18) und den Geschwindigkeits-Mess- und Modifiziermitteln (3, 12) zu verändern, wobei das Element mit Betätigungsmitteln (33) verbunden ist, welche es dem Element (31) ermöglichen, bei Bedarf auf das Garn einzuwirken.
  2. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet,
    dass das Element (31) ein Radmittel ist, wie eine Rolle oder dergleichen.
  3. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet,
    dass das Element (31) ein Garnbremselement ist.
  4. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet,
    dass die Betätigungsmittel (33) als ein Elektromotor, ein druckluftbetätigter Motor oder dergleichen ausbildet sind.
  5. Vorrichtung nach Anspruch 2 und Anspruch 4,
    dadurch gekennzeichnet,
    dass das Element (31) mit der Abtriebswelle des Elektromotors verbunden ist, welcher die Betätigungsmittel (33) definiert.
  6. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet,
    dass die Betätigungsmittel (33) durch eine Steuereinheit (34) befehlsgesteuert sind, welche mit den Steuermitteln (20) für die Spannungsbestimmungsmittel (18) und für die Geschwindigkeits-Mess- und Modifiziermittel (3, 12) zusammenwirkt, wobei die Steuermittel (20) Informationen mit der Einheit (34) bezüglich der Geschwindigkeit austauschen, mit welcher das Garn (11) der Textilmaschine (10) zugeführt wird, um es der Steuereinheit (34) zu ermöglichen, die Betätigungsmittel (33) zu veranlassen, auf das in Kontakt mit dem Garn (11) befindliche Element (31) einzuwirken, um die Garngeschwindigkeit zu verändern, und um umgekehrt die Steuermittel (20) in die Lage zu versetzen, die Geschwindigkeit des der Textilmaschine (10) zugeführten Garns (11) auf der Grundlage der von dem Element (31) vorgenommenen Veränderung der Garngeschwindigkeit zu regulieren, wobei die Steuereinheit (34), die Betätigungsmittel (33), das von den Betätigungsmitteln (33) gesteuerte Element (31), die Steuermittel (20), die Spannungsbestimmungsmittel (18) und die Geschwindigkeits-Mess- und Modifiziermittel einen Steuer-/Regelkreis der Textilmaschine für die Zufuhr des elastomeren Garns mit konstanter Spannung und konstanter Geschwindigkeit bilden.
  7. Vorrichtung nach Anspruch 6,
    dadurch gekennzeichnet,
    dass die Steuermittel (20) mit Mitteln (27) zum Steuern des Betriebs der Textilmaschine zusammenwirken.
  8. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet,
    dass die Bestimmungsmittel (18) und die Mess- und Modifiziermittel (3, 12) jeweils einer einzelnen gemeinsamen Haltevorrichtung zugeordnet sind, welche den Körper (2) der Vorrichtung (1) definiert.
  9. Verfahren zum Zuführen eines elastomeren Garns zu einer Textilmaschine, um einen Gegenstand gleich bleibender Qualität in jedem seiner Bestandteile zu erhalten, indem eine Vorrichtung gemäß Anspruch 1 verwendet wird, wobei das Verfahren ein Messen der Spannung und Geschwindigkeit oder Menge des Garns (11) beinhaltet, welches der Textilmaschine zugeführt und von einer Garnspule (B) abgezogen wird, wobei das Verfahren dadurch gekennzeichnet ist,
    dass das Garn (11), nachdem es von der Garnspule (B) abgezogen wurde, derart beeinflusst wird, dass seine Zulaufgeschwindigkeit zu der Textilmaschine modifiziert wird, wobei diese Einflussnahme durch die Kompensatormittel der Vorrichtung in einem Punkt entlang des Wegs des Garns stromaufwärts der Messung seiner Geschwindigkeit und Spannung erfolgt, während kontinuierlich die Geschwindigkeit des Garns stromabwärts dieses Wegpunkts gemessen wird, und wobei auf der Grundlage der gemessenen Geschwindigkeit auf das Garn eingewirkt wird, um eine auf Durchmesser und Längung bezogene Abmessungsstabilität des Garns (11) zu erhalten, welches der Textilmaschine zugeführt wird.
  10. Verfahren nach Anspruch 9,
    dadurch gekennzeichnet,
    dass die Einwirkung auf das Garn (11) eine Bremseinwirkung ist.
  11. Verfahren nach Anspruch 9,
    dadurch gekennzeichnet,
    dass die Einwirkung auf das Garn (11) eine Beschleunigungseinwirkung ist.
EP03745773A 2002-04-10 2003-03-28 Vorrichtung und methode zur belieferung einer textilmaschine mit einem elastomeren garn Expired - Lifetime EP1492911B9 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI20020770 2002-04-10
IT2002MI000770A ITMI20020770A1 (it) 2002-04-10 2002-04-10 Dispositivo e metodo per alimentare un filo elastomerico ad una macchina tessile al fine di avere un manufatto di qualita' costante in ogni
PCT/EP2003/003257 WO2003085183A1 (en) 2002-04-10 2003-03-28 Device and method for feeding an elastomeric yarn to a textile machine

Publications (3)

Publication Number Publication Date
EP1492911A1 EP1492911A1 (de) 2005-01-05
EP1492911B1 EP1492911B1 (de) 2010-05-05
EP1492911B9 true EP1492911B9 (de) 2010-09-01

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US (1) US20050173579A1 (de)
EP (1) EP1492911B9 (de)
CN (1) CN100434585C (de)
AT (1) ATE466982T1 (de)
AU (1) AU2003226739A1 (de)
DE (1) DE60332444D1 (de)
ES (1) ES2345098T3 (de)
IT (1) ITMI20020770A1 (de)
RU (1) RU2004133029A (de)
WO (1) WO2003085183A1 (de)

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CN106592084B (zh) * 2017-02-22 2019-04-05 武汉纺织大学 一种电磁驱动圆纬机的输纱装置及方法
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RU2664205C1 (ru) * 2014-09-22 2018-08-15 Машиненфабрик Нихофф Гмбх Унд Ко. Кг Катушкодержатель для оплеточной, обмоточной или спираленавивочной машины

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CN1639401A (zh) 2005-07-13
ITMI20020770A0 (it) 2002-04-10
AU2003226739A1 (en) 2003-10-20
ES2345098T3 (es) 2010-09-15
EP1492911A1 (de) 2005-01-05
US20050173579A1 (en) 2005-08-11
RU2004133029A (ru) 2005-04-20
ATE466982T1 (de) 2010-05-15
ITMI20020770A1 (it) 2003-10-10
EP1492911B1 (de) 2010-05-05
CN100434585C (zh) 2008-11-19
WO2003085183A1 (en) 2003-10-16
DE60332444D1 (de) 2010-06-17

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