EP1473394B1 - Vorrichtung und Verfahren zum Regeln der Fadenspannung, für die Fadenlieferung mit konstanter Fadenspannung zu einer Strickmaschine - Google Patents

Vorrichtung und Verfahren zum Regeln der Fadenspannung, für die Fadenlieferung mit konstanter Fadenspannung zu einer Strickmaschine Download PDF

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Publication number
EP1473394B1
EP1473394B1 EP04009334A EP04009334A EP1473394B1 EP 1473394 B1 EP1473394 B1 EP 1473394B1 EP 04009334 A EP04009334 A EP 04009334A EP 04009334 A EP04009334 A EP 04009334A EP 1473394 B1 EP1473394 B1 EP 1473394B1
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EP
European Patent Office
Prior art keywords
gram force
thread
signal
derivative
motor
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Expired - Lifetime
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EP04009334A
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English (en)
French (fr)
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EP1473394A1 (de
Inventor
Riccardo Lonati
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Individual
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Individual
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Classifications

    • 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 present invention relates to a device and a method for adjusting the gram force applied to the thread, capable of feeding thread of a knitting machine so as to ensure its constant tension.
  • the invention relates to a device and a method for adjusting the gram force applied to the thread to be fed to the knitting machine so as to maintain the tension of the thread always constant, in order to provide a manufactured article of optimum quality.
  • control described above uses two control parameters, i.e., the gram force applied to the thread together with the feed rate of such thread, i.e., the rotation rate of the motor.
  • US-6,010,052 discloses a yarn supply apparatus with electronic control as defined in the preamble of claim 1.
  • the aim of the present invention is to provide a device and a method for controlling the gram force applied to the thread, in order to feed the thread to the knitting machine so as to ensure that its tension is always constant and conforms with a preset tension set by the machine.
  • an object of the present invention is to provide a device and a method for adjusting the gram force applied to a thread that substantially allows to predict the behavior of such thread without the need to obtain a precise value for the gram force applied to the thread.
  • Another object of the present invention is to provide a device and a method for adjusting the gram force applied to a thread in a knitting machine that allows to eliminate speed control yet is able to keep constant the gram force required with any type of thread.
  • Another object of the present invention is to provide a device and a method for adjusting the gram force applied to a thread that is highly reliable, relatively simple to provide, and at competitive costs.
  • the adjustment device shown schematically as a block diagram in Figure 1 and generally designated by the reference numeral 1, comprises a control unit 2, which is adapted to drive power supply means 3 of at least one motor 4, which is adapted to unwind a thread 5 from a spool of thread in order to feed said thread to the knitting machine 6.
  • the thread that exits from the spool is passed through gram force sensor means 7, which detect the gram force applied to the thread, i.e., its tension, and emit a gram force signal 8, which is compared in comparator means 9 with a reference signal 10 (refgr.) in order to emit a gram force error signal errgr., which is sent to the control unit 2.
  • gram force sensor means 7 detect the gram force applied to the thread, i.e., its tension, and emit a gram force signal 8 which is compared in comparator means 9 with a reference signal 10 (refgr.) in order to emit a gram force error signal errgr., which is sent to the control unit 2.
  • control unit 2 comprises a controller 11, for example of the PID type, which receives in input the gram force error signal errgr., together with the derivative of the gram force signal 8 (gr.) that arrives from the gram force sensor means 7.
  • control unit 2 predicts the behavior of the thread on the basis of the evaluation of the derivative of the gram force signal, designated by the reference numeral 12 in Figure 1 , and of at least one threshold, preferably a plurality of thresholds, designated by the reference signs S1, S2 and S3 in Figure 2 , set on the gram force error errgr. 9.
  • the derivative of the gram force signal 12 is not calculated here precisely, since it is sufficient to calculate exclusively its sign in order to determine whether the thread 5 is tensioning (with the risk of snapping) or slackening, a situation which entails the need to reduce the rotation rate of the motor.
  • the gram force adjustment device uses a single parameter to control the rotation rate of the motor, i.e., the gram force signal 8 obtained by the gram force sensor means 7.
  • the second signal that is used is a signal that is strictly correlated to the gram force signal 8, since it is the derivative thereof with respect to time.
  • the adjustment device uses, differently from the background art, a single parameter to control the gram force applied to the thread, and therefore the rotation rate of the motor 4, and can be used with any type of thread used by the machine.
  • the gram force sensor means 7 which are constituted for example by a load cell and are capable of emitting a gram force signal 8 that indicates therefore the tension of the thread at a given instant.
  • the gram force signal is compared in the comparator means 9 with a reference gram force, i.e., tension, which is preset for the machine, and the gram force error signal errgr. is then emitted.
  • control unit 2 by using the gram force error signal errgr., together with the derivative with respect to time of the gram force signal 8, and by using at least one threshold or preferably more than one threshold, determines whether the motor 4 is to be supplied with power at the maximum speed, disabled or braked, or whether a control of the PID type is to be performed by means of the controller 11.
  • Figure 2 shows three separate thresholds of the gram force error, designated by the reference signs S1, S2 and S3.
  • the chart plots the gram force error errgr. on the axis of the ordinates and the type of control to be performed for the motor 4 on the axis of the abscissae.
  • the curve shown in the chart of Figure 2 represents the error of the gram force signal 8.
  • the curve intersects the threshold designated by S 1 with a rising trend, and in this region a control of the PID type of the motor 4 is performed.
  • the curve of the signal changes inclination and the motor is disabled.
  • the curve of the signal 8 reaches a negative minimum and in this step the motor is supplied with no current.
  • the power supply means 3 of the motor 4 modulate, on the basis of the chart shown in Figure 2 , the motor current in an open loop, performing only a control of current limiting.
  • the device and method according to the present invention fully achieve the intended aim and objects, since they allow to provide a control with adjustment of the gram force applied to the thread by using a single parameter, i.e., the tension of said thread, without resorting to a detection of the speed of the thread and therefore of the rotation rate of the motor.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Golf Clubs (AREA)

Claims (7)

  1. Eine Vorrichtung zur Einstellung der Fadenspannung, die auf einen Faden in Strickmaschinen ausgeübt wird, Folgendes umfassend: eine Steuereinheit (2), die ausgebildet ist, um ein Stromversorgungsmittel (3) mindestens eines Motors (4) zum Abwickeln eines Fadens (5)anzutreiben, der der Strickmaschine zugeführt werden soll, ein Fadenspannungs-Erfassungsmittel (7), das ausgebildet ist, um die Fadenspannung zu erfassen, die auf den Faden (5) ausgeübt wird, und um ein Fadenspannungssignal (8) zu senden, ein Komparatormittel (9), das ausgebildet ist, um das Fadenspannungssignal (8) mit einem Referenzsignal (10) zu vergleichen, um ein Fadenspannungs-Fehlersignal (errgr) zu erhalten, wobei die Steuereinheit (2) ein Mittel (11) umfasst, das ausgebildet ist, um ein Signal zum Antreiben des Stromversorgungsmittels (3) des Motors zu senden, dadurch gekennzeichnet, dass das Signal zum Antreiben des Stromversorgungsmittels entsprechend dem Fadenspannungs-Fehlersignal (errgr) des Fadens und entsprechend einem Signal (12) gesendet wird, welches die Ableitung mit Bezug auf die Zeit des Fadenspannungssignals. (8) ist, das von dem Fadenspannungs-Erfassungsmittel (7) gesendet wird, und dadurch, dass die Steuereinheit (2) das Verhalten des Fadens anhand der Bewertung der Ableitung des Fadenspannungssignals (8) und anhand mindestens eines Schwellenwertes (S1, S2, S3) vorhersagt, der für das Fadenspannungs-Fehlersignal (errgr) gesetzt ist.
  2. Die Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Steuereinheit (2) einen Kontroller (11) des PID-Typs umfasst, der ausgebildet ist, um als Eingabe das Fadenspannungs-Fehlersignal (errgr), gemeinsam mit dem Ableitungssignal (12) mit Bezug auf die Zeit des Fadenspannungssignals (8) zu empfangen.
  3. Die Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass das Mittel, das ausgebildet ist, um die Ableitung (12) mit Bezug auf die Zeit des Fadenspannungssignals (8) zu bestimmen, ausgebildet ist, um das Vorzeichen der Ableitung zu bestimmen.
  4. Die Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass der Kontroller (11) ausgebildet ist, um das Motor-Stromversorgungsmittel (3) anzutreiben, um den Motor (4) zu versorgen, um einen konstanten Wert der Fadenspannung aufrechtzuerhalten, die auf den Faden (5) ausgeübt wird.
  5. Ein Verfahren zur Einstellung der Fadenspannung, die auf den Faden einer Strickmaschine ausgeübt wird, das folgende Schritte umfasst:
    Einstellung der Fadenspannung, die auf den Faden (5) ausgeübt wird, entsprechend einer Referenz-Fadenspannung (10) und Ausgleich von Spannungs-Diskontinuitäten des Fadens anhand einer Vorhersage des Verhaltens des Fadens, wobei die Vorhersage auf einer Ableitung (12) mit Bezug auf die Zeit eines Fadenspannungssignals (8) und mindestens einem Schwellenwert (S1, S2, S3) basiert, der in Bezug auf ein Fadenspannungs-Fehlersignal (errgr) festgelegt wird, welches durch den Vergleich eines Fadenspannungs-Werts, der vom Fadenspannungs-Erfassungsmittel (7) erfasst wird, mit dem Referenz-Fadenspannungswert (10) gewonnen wird.
  6. Das Verfahren gemäß Anspruch 5, dadurch gekennzeichnet, dass das Fadenspannungs-Fehlersignal (errgr), gemeinsam mit dem Zeitableitungssignal (12) der Fadenspannung, die auf den Faden (5) ausgeübt wird, an einen Kontroller (11) gesendet wird, der ausgebildet ist, um das Stromversorgungsmittel (3) des Motors (4) anzutreiben, um die Spannung des Fadens konstant zu halten.
  7. Das Verfahren gemäß Anspruch 5, dadurch gekennzeichnet, dass das Zeitableitungssignal (12) der Fadenspannung (8), die auf den Faden (5) ausgeübt wird, im Hinblick auf das Vorzeichen der Ableitung bewertet wird.
EP04009334A 2003-04-30 2004-04-20 Vorrichtung und Verfahren zum Regeln der Fadenspannung, für die Fadenlieferung mit konstanter Fadenspannung zu einer Strickmaschine Expired - Lifetime EP1473394B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20030892 2003-04-30
IT000892A ITMI20030892A1 (it) 2003-04-30 2003-04-30 Dispositivo e procedimento di regolazione della grammatura

Publications (2)

Publication Number Publication Date
EP1473394A1 EP1473394A1 (de) 2004-11-03
EP1473394B1 true EP1473394B1 (de) 2010-06-16

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EP04009334A Expired - Lifetime EP1473394B1 (de) 2003-04-30 2004-04-20 Vorrichtung und Verfahren zum Regeln der Fadenspannung, für die Fadenlieferung mit konstanter Fadenspannung zu einer Strickmaschine

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US (1) US20040217224A1 (de)
EP (1) EP1473394B1 (de)
AT (1) ATE471401T1 (de)
DE (1) DE602004027681D1 (de)
IT (1) ITMI20030892A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102677384A (zh) * 2012-06-08 2012-09-19 慈溪太阳洲纺织科技有限公司 储纱器
CN102704165A (zh) * 2012-06-08 2012-10-03 慈溪太阳洲纺织科技有限公司 一种控制储纱器上输线轮运动状态的方法
CN105540339B (zh) * 2016-01-22 2018-07-20 华南理工大学 一种用于空气包覆纱机的自动进线系统及方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0694614B2 (ja) * 1983-02-25 1994-11-24 津田駒工業株式会社 織機の電動送り出し方法およびその装置
DE3729297C1 (de) * 1987-09-02 1989-03-02 Gustav Memminger Vorrichtung zur UEberwachung der Fadenlieferung bei einer Fadenliefervorrichtung fuer Textilmaschinen
SE508469C2 (sv) * 1993-04-21 1998-10-12 Sipra Patent Beteiligung Garnmataranordning i en textilmaskin samt förfarande för användning av garnmataranordning
DE19537215C2 (de) * 1995-10-06 1999-09-02 Memminger Iro Gmbh Fadenliefergerät für elastische Garne
DE19537325C1 (de) * 1995-10-06 1996-11-28 Memminger Iro Gmbh Fadenliefergerät mit elektronischer Ansteuerung
DE19813351A1 (de) * 1998-03-26 1999-09-30 Memminger Iro Gmbh Trägheitsarmer Positivfournisseur für Elastomerfäden
JP3603031B2 (ja) * 2001-01-31 2004-12-15 株式会社島精機製作所 給糸装置

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Publication number Publication date
ITMI20030892A1 (it) 2004-11-01
EP1473394A1 (de) 2004-11-03
ATE471401T1 (de) 2010-07-15
US20040217224A1 (en) 2004-11-04
DE602004027681D1 (de) 2010-07-29

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