EP4310044A1 - Mit einer fadenspannvorrichtung eines garns versehene wickeleinheit und zugehöriges steuerungsverfahren - Google Patents

Mit einer fadenspannvorrichtung eines garns versehene wickeleinheit und zugehöriges steuerungsverfahren Download PDF

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Publication number
EP4310044A1
EP4310044A1 EP23179621.0A EP23179621A EP4310044A1 EP 4310044 A1 EP4310044 A1 EP 4310044A1 EP 23179621 A EP23179621 A EP 23179621A EP 4310044 A1 EP4310044 A1 EP 4310044A1
Authority
EP
European Patent Office
Prior art keywords
yarn
winding
tension
rotor
thread
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.)
Pending
Application number
EP23179621.0A
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English (en)
French (fr)
Inventor
Mauro Moro
Fabio D'agnolo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Savio Macchine Tessili SpA
Original Assignee
Savio Macchine Tessili SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Savio Macchine Tessili SpA filed Critical Savio Macchine Tessili SpA
Publication of EP4310044A1 publication Critical patent/EP4310044A1/de
Pending legal-status Critical Current

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Classifications

    • 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
    • B65H59/36—Floating elements compensating for irregularities in supply or take-up of 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
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • 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 present invention relates to a winding unit provided with a thread tensioning device of a yarn, and the related control method.
  • the winding units are typically provided with a special device, called a thread tensioner, which is responsible for controlling the tension of the yarn in motion. Moving along the thread path from the bottom upwards, the thread tensioner is interposed between the untangler, which controls the evolution of the unwinding balloon of the spool below, and the winding cylinder, which governs the collection of the yarn in the reel above by means of the thread guiding cylinder.
  • the system also comprises a sensor, located before the collection unit, configured to monitor the thread tension and to feed the control loop in feedback which controls the thread tensioner itself, so as to follow a predefined tension target.
  • the thread tensioner applies a certain overtension to the thread in motion as a function of the actual value read by the sensor and the stored setpoint. If the thread tensioner is no longer able to limit the tension, the system reduces the winding speed and thus also the hourly production of the head.
  • an effective tension modulation strategy consists in the adoption of systems, such as those illustrated in patents US5377923A and EP3950551A1 , which respectively axially follow or radially contain the extension of the untangling balloon.
  • the thread unwinds from the spool at pulsating height as a function of the length of the free section from the pick-up point, on which the size of the balloon correspondingly depends and thus the tension which is generated in the thread due to the centrifugal force, also with pulsating and increasing trend as the untangling proceeds.
  • these devices it is possible to reduce the difference in tension between the start and end of the spool and thus limit the tension variability in input to the normal tensioning devices.
  • the winding tension essentially depends on the collection speed of the yarn, which in turn depends on the peripheral winding speed imposed by the winding cylinder and the transverse crossing speed imposed by the thread guide. In fact, even if the winding cylinder rotates at a substantially constant speed, the draw speed of the thread undergoes considerable oscillations due to the geometry of the collection system, in particular for two different reasons.
  • the first cause lies in the crossing, i.e., in the oscillatory distribution of the turns of thread on the winding reel.
  • the yarn guide cylinder imposes a predefined transverse deposit law on the reel and, as a function of the shape of the grooves and the crossing frequency, periodically lengthens and shortens the length of the section of thread which oscillates between the last transverse reel constraint and the thread guide.
  • Such a length is minimum when the thread guide delivers the thread to the centreline of the reel (and thus is at the middle of its stroke), while it is maximum when the thread guide deposits the thread at the two ends of the reel (and is thus at the ends of its stroke).
  • This pulsing variation in the length of the thread path translates into a first pulsation of the speed of the thread, which recalls from the spool precisely the stretch of thread which corresponds to the length wound in the reel, increased or decreased by the periodic excursion due to the crossing.
  • the second cause of pulsation of the draw speed of the thread lies, instead, in the conicity of the reel.
  • the thread When the thread is wound on the larger diameter portion (reel bottom), it is drawn with a higher peripheral speed and is thus subjected to a greater tension; conversely, when the thread is wound on the smaller diameter portion (reel tip), the thread is drawn at a lower speed and is less taut. In other words, the thread undergoes a lower or higher pull as a function of the winding position on the reel.
  • the conicity of the tubes is rather limited, at the usual winding speeds the thread is subjected to pulsations of draw speeds that are not at all negligible, with relative variations between tip and tail which can reach up to 20%.
  • the thread tensioner is responsible for adjusting and compensating for such variations in the speed and tension of the thread, as well as damping any vibrations due to the untangling of the thread from the spool.
  • the plate thread tensioner consists of a pair of discs with opposite friction which exert an adjustable braking pressure on the running thread, approaching or moving away, without however changing the path thereof.
  • patent EP734990B1 illustrates a magnetically driven plate thread tensioner
  • patent EP1975105A2 describes one having a plurality of pairs of springloaded plates.
  • the structure of the device consists of a plurality of fixed and movable diverters arranged in a comb according to an opposite and offset configuration, which mutually interpenetrate to multiply the thread tension by means of an increase or decrease in the total winding angle of the thread, and thus the friction force induced therein.
  • patents US5499772A and US5738295A describe comb thread tensioners which control the adjustment with the excitation of a solenoid
  • patent IT1276819B1 describes an apparatus with pneumatic control.
  • the thread tensioners of the prior art are affected by a poor dynamic response and by a limited ability to modulate the tension, consequently they are not capable of following the speed and tension pulsations to which the thread is subjected with sufficient rapidity, nor to effectively dampen the relative peaks.
  • the thread tensioner is capable of following the evolution of the untangling of the spool by measuring the average tension of the thread which reaches the reel, for example with the tension sensor, and adjusting the additional tension induced by the thread tensioner to ensure a predetermined overall average tension. If the tension cannot be reduced as expected even after reducing the tension added by the thread tensioner to a minimum, the system is forced to reduce the winding speed of the cylinder to lower the tension, with consequent loss of productivity of the unit and thus of the machine.
  • the tension control is not accurate, the clearer can give rise to false cuts, because for example the shape and size of the defects vary or because a loosening of the yarn is mistakenly read as a defect.
  • the unevenness of the tension gives rise to winding portions having different tensions, to the detriment of the quality of the reel formed, especially for particularly slippery yarns and for dyeing reels, whose dye absorption is strongly linked to the winding/spooling tension of the thread.
  • a winding unit provided with a thread tensioning device of a yarn according to claim 1 and a method for controlling the winding tension of a yarn in accordance with claim 13.
  • reference numeral 4 globally indicates a winding unit of a yarn 8.
  • thread or single thread or continuous thread refers to a single filament or continuous filament (for example in the case of silk, artificial or synthetic fibres), while the term yarn refers to a group of fibrils of varying lengths which are paralleled and joined together by twisting.
  • thread or single thread or continuous thread refers to a single filament or continuous filament (for example in the case of silk, artificial or synthetic fibres)
  • yarn refers to a group of fibrils of varying lengths which are paralleled and joined together by twisting.
  • one or the other term will be used indifferently, it being understood that the applications of the present invention are not limited to one or the other type.
  • the winding unit 4 of a yarn 8 comprises a spool 20 on which said yarn 8 is wound and a reel 32 on which to wind the yarn 8 unwound from the spool 20.
  • the winding unit further comprises winding means 36 for performing the unwinding of the yarn 8 of the spool 20 and the winding of the yarn 8 on the reel 32.
  • Said winding means 36 can comprise, for example, a thread guide cylinder 40 operatively connected to the reel 32 or a crossing device 44 associated with said thread guide cylinder 40.
  • the winding unit 4 can further comprise a clearer 48 and a yarn reattachment or splicer device 52 in the event of breakage of the yarn itself, in a known manner.
  • the winding unit 4 advantageously comprises a thread tensioning device 56 of said yarn 8, for controlling the tension of the yarn during its unwinding from the spool 20 and its winding on the reel 32.
  • said thread tensioning device 56 comprises a rotor 60 mechanically connected to an electric motor 64 for rotating around a control axis X-X.
  • the yarn 8 unwound from the spool 20 is wound with a predetermined number of turns around a winding portion 68 of said rotor 60.
  • the rotor 60 is positioned between the spool 20 and the reel 32 so as to intercept the yarn 8 which is unwound and subsequently wound.
  • the rotor 60 has a moment of inertia less than 5000 g mm 2 with respect to the control axis X-X. Thereby the rotor 60 can quickly respond to any acceleration/deceleration condition and thus limit the transient dynamic effects.
  • the rotor 60 has a turn winding diameter less than 75 mm. Thereby, the rotor 60 can quickly respond to any acceleration/deceleration condition and thus limit the transient dynamic effects.
  • the rotor 60 is driven by a brushless electric motor 64: this type of electric motor is particularly advantageous, because this type of motor has low inertia as well as high dynamic performance, to the advantage of the overall response readiness of the thread tensioning device 56.
  • the brushless motor is characterized by high efficiency, which translates into a substantial energy saving, given the continuous operation.
  • the winding unit 4 comprises at least one angular speed sensor 76 of the rotor 60; it is thereby possible to perform a speed control in a precise and timely manner, especially for the purposes of metering the yarn 8 and thus the reel 32 being formed.
  • said angular velocity sensor 76 of the rotor 60 is an encoder or a resolver.
  • said angular speed sensor 76 of the rotor 60 is integrated in the electric motor 64, to the advantage of the compactness of the thread tensioning device 56.
  • the winding unit 4 further comprises a processing and control unit 80 operatively connected to said electric motor 64 and programmed to control the rotation of the rotor 60 so that the tension of the yarn 8 follows the set tension value.
  • the processing and control unit 80 is programmed so as to increase or decrease the rotation speed of the rotor 60 respectively to increase or reduce the peripheral speed of the yarn 8 (and thus its drawing depending on the reel 32 winding demand) if the tension of the yarn 8 deviates from said set value.
  • the processing and control unit 80 is programmed to operate a tension control of the yarn 8 in open loop, inferring the instantaneous tension of the yarn starting from operating parameters of the winding unit 4, such as the winding speed, the type of thread guide cylinder and the moment when the yarn has passed at least one known point of the crossing.
  • This solution makes it possible to have a relatively simple thread tensioning device 56, without the need to make the electronic architecture of the winding unit 4 excessively complex and at the same time using already known process variables.
  • the moment of passage of the thread 8 in the at least one known point of the crossing is detected by sensor means.
  • said sensor means can comprise a vision system.
  • said sensor means can be of the optical or piezoelectric type.
  • the thread tensioning device 56 comprises at least one tension sensor 84 of the yarn 8, configured to continuously monitor the winding tension of the yarn 8 prior to its winding in the reel 32.
  • Said tension sensor 84 of the yarn 8 is operatively connected to the processing and control unit 80, so that a tension control of the yarn 8 can operate in closed loop. It is thereby possible to obtain a much more accurate piloting of the tension of the yarn 8.
  • the angular speed of the rotor 60 is piloted to follow a set theoretical value of the tension of the yarn 8, which is measured by the tension sensor 84.
  • the tension of the yarn 8 grows, the angular speed of the rotor 60 is increased, thus returning (i.e., reducing) the measured tension to said set theoretical value.
  • said at least one tension sensor 84 of the yarn 8 is installed near the rotor 60, so as to limit the dimensions of the thread tensioning device 56 and simplify the architecture of the winding unit 4.
  • said at least one tension sensor 84 of the yarn 8 is installed near the thread guide cylinder 40 operatively connected to the reel 32.
  • the rotor 60 can operate in coupling with outer compensation means 90 configured to dynamically increase or decrease the amount of thread 8 wound on the winding portion 68 of the rotor 60.
  • the compensation means are driven by a brushless electric motor.
  • This type of electric motor is particularly advantageous, because this type of motor has low inertia as well as high dynamic performance, benefiting the overall response readiness of the compensation means 90.
  • said outer compensation means 90 comprise a slider 92 which moves with respect to the rotor 60, in which said slider 92 comprises an eyelet 94 forming an insertion point of the thread 8 on the rotor 60.
  • the displacement of the slider 92 and the related insertion point of the thread 8 can be controlled in relation to the type of thread guide cylinder 40, and/or in relation to the rotation speed of the thread guide cylinder 40 and/or in relation to the position of the thread 8 on the thread guide cylinder 40.
  • the slider is operatively connected to motor means (not shown) in turn connected to the processing and control unit 80.
  • the slider 92 moves along a circular trajectory with respect to the control axis X-X, near the outer periphery of the rotor 60.
  • the present invention has considerable advantages with respect to the current solutions of the prior art and allows to overcome the drawbacks thereof.
  • a first advantage of this solution lies in the fact that the tension is made ideally constant between the start and end of the spool, and between spool and spool, which greatly improves the formation of the reel.
  • the device acts as an integrated metering system, as well as a speedometer.
  • the rotor can operate in coupling with outer compensation means configured to dynamically increase or decrease the total number of turns wound, moving the insertion point of the thread on the rotor forward or backward and therefore also instantly varying the winding of the thread.
  • outer compensation means configured to dynamically increase or decrease the total number of turns wound, moving the insertion point of the thread on the rotor forward or backward and therefore also instantly varying the winding of the thread.
  • the system is also capable of compensating for the variations in speed between the reel tail and tip, typical of conical reels, which are normally absorbed by the untangling of the spool, which is a highly dynamic process, working at speeds of tens of metres per second, as well as unstable.
  • the system described above in the step between tail and tip, actively increases the winding on the rotor, varying the position of the entry point, while in the step between tip and tail, it reduces it, cancelling or greatly reducing the fluctuation of the draw speed to which the thread being untangled from the spool is subjected.
  • the tensioning system will be capable of predicting the demand for thread to the spool, maintaining the draw speed substantially constant and at the same time eliminating the problems of rising turns and/or tension peaks capable of generating breakage, losses and/or false cuts of the clearer.
  • the use of the apparatus in object does not change the current spool side setup and does not involve substantial construction changes, therefore it can be easily implemented even on existing machines, without entailing considerable increases in footprint.
EP23179621.0A 2022-07-20 2023-06-15 Mit einer fadenspannvorrichtung eines garns versehene wickeleinheit und zugehöriges steuerungsverfahren Pending EP4310044A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202200015183 2022-07-20

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EP4310044A1 true EP4310044A1 (de) 2024-01-24

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EP23179621.0A Pending EP4310044A1 (de) 2022-07-20 2023-06-15 Mit einer fadenspannvorrichtung eines garns versehene wickeleinheit und zugehöriges steuerungsverfahren

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EP (1) EP4310044A1 (de)
CN (2) CN117429955A (de)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0499380A1 (de) * 1991-02-12 1992-08-19 JONES STROUD & CO LTD Fadenliefersystem
US5377923A (en) 1991-07-01 1995-01-03 Murata Kikai Kabushiki Kaisha Yarn unwinding assisting device and yarn unwinding method in an automatic winder
US5499772A (en) 1992-10-16 1996-03-19 Murata Kikai Kabushiki Kaisha Winding operation control method and apparatus for automatic winder
IT1276819B1 (it) 1994-10-05 1997-11-03 Murata Machinery Ltd Dispositivo tenditore e macchina tessile utilizzante tale dispositivo
US5738295A (en) 1995-11-28 1998-04-14 W. Schlafhorst Ag & Co. Process and apparatus for tensioning a traveling thread in a textile machine by means of a comb tensioner
EP0734990B1 (de) 1995-03-31 1999-08-25 SAVIO MACCHINE TESSILI S.p.A. Vorrichtung für die ununterbrochene und automatische Überwachung und Steuerung der Spannung, der ein Faden während seines Aufwickelns ausgesetzt ist
EP1975105A2 (de) 2007-03-30 2008-10-01 Murata Machinery, Ltd. Vorrichtung zum Anbringen von Spannung
EP2684827A2 (de) * 2012-07-12 2014-01-15 Rieter CZ s.r.o. Trommelzwischenlagerung von Garn an einer Betriebseinheit einer Textilmaschine und Steuerungsverfahren dafür
WO2020075444A1 (ja) * 2018-10-12 2020-04-16 村田機械株式会社 糸巻取装置及び糸巻取方法
EP3371082B1 (de) * 2015-11-03 2021-02-17 Vandewiele NV Garnspannsystem und verfahren zum halten eines garns aus einem garnspeichersystem auf einem garnabstreifsystem einer webmaschine unter spannung
EP3865441A1 (de) * 2018-10-09 2021-08-18 TMT Machinery, Inc. Garnwicklungsmaschine
EP3950551A1 (de) 2020-08-07 2022-02-09 Savio Macchine Tessili S.p.A. Vorrichtung und verfahren zur steuerung eines ballons, wickeleinheit mit einer solchen vorrichtung

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0499380A1 (de) * 1991-02-12 1992-08-19 JONES STROUD & CO LTD Fadenliefersystem
US5377923A (en) 1991-07-01 1995-01-03 Murata Kikai Kabushiki Kaisha Yarn unwinding assisting device and yarn unwinding method in an automatic winder
US5499772A (en) 1992-10-16 1996-03-19 Murata Kikai Kabushiki Kaisha Winding operation control method and apparatus for automatic winder
IT1276819B1 (it) 1994-10-05 1997-11-03 Murata Machinery Ltd Dispositivo tenditore e macchina tessile utilizzante tale dispositivo
EP0734990B1 (de) 1995-03-31 1999-08-25 SAVIO MACCHINE TESSILI S.p.A. Vorrichtung für die ununterbrochene und automatische Überwachung und Steuerung der Spannung, der ein Faden während seines Aufwickelns ausgesetzt ist
US5738295A (en) 1995-11-28 1998-04-14 W. Schlafhorst Ag & Co. Process and apparatus for tensioning a traveling thread in a textile machine by means of a comb tensioner
EP1975105A2 (de) 2007-03-30 2008-10-01 Murata Machinery, Ltd. Vorrichtung zum Anbringen von Spannung
EP2684827A2 (de) * 2012-07-12 2014-01-15 Rieter CZ s.r.o. Trommelzwischenlagerung von Garn an einer Betriebseinheit einer Textilmaschine und Steuerungsverfahren dafür
EP3371082B1 (de) * 2015-11-03 2021-02-17 Vandewiele NV Garnspannsystem und verfahren zum halten eines garns aus einem garnspeichersystem auf einem garnabstreifsystem einer webmaschine unter spannung
EP3865441A1 (de) * 2018-10-09 2021-08-18 TMT Machinery, Inc. Garnwicklungsmaschine
WO2020075444A1 (ja) * 2018-10-12 2020-04-16 村田機械株式会社 糸巻取装置及び糸巻取方法
EP3950551A1 (de) 2020-08-07 2022-02-09 Savio Macchine Tessili S.p.A. Vorrichtung und verfahren zur steuerung eines ballons, wickeleinheit mit einer solchen vorrichtung

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