EP2631339B1 - Garnzuführungsvorrichtungen mit geregelter Spannung für Textilmaschinen, mit Garnrückgewinnungsfunktion - Google Patents

Garnzuführungsvorrichtungen mit geregelter Spannung für Textilmaschinen, mit Garnrückgewinnungsfunktion Download PDF

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Publication number
EP2631339B1
EP2631339B1 EP20120007753 EP12007753A EP2631339B1 EP 2631339 B1 EP2631339 B1 EP 2631339B1 EP 20120007753 EP20120007753 EP 20120007753 EP 12007753 A EP12007753 A EP 12007753A EP 2631339 B1 EP2631339 B1 EP 2631339B1
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EP
European Patent Office
Prior art keywords
yarn
reel
tension
braking
programmed
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EP20120007753
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English (en)
French (fr)
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EP2631339A1 (de
Inventor
Giovanni Pedrini
Pietro Zenoni
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LGL Electronics SpA
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LGL Electronics SpA
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    • 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
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • 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
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/26—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path
    • 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
    • D03D47/347—Yarn brakes
    • 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
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/364—Yarn braking means acting on the drum
    • 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 controlled-tension yam-feeding apparatus for textile machines, with yam-recovering function
  • yam feeders which are provided with a stationary drum on which a motorized swivel arm winds a plurality of yarn loops forming a weft stock.
  • the yarn unwinding from the drum upon request from a downstream textile machine is subject to the action of a stabilizing brake which maintains the delivered yarn under a slight tension.
  • the stabilizing brake typically comprises a frustoconical hollow member which is biased with its inner surface against the delivery edge of the drum, by manually adjustable elastic means.
  • a controlled brake may be arranged downstream of the feeder in order to maintain the feeding tension substantially constant, e.g., a lamina-based brake of the type described in EP 0 622 485 .
  • the controlled brake is subject to a feedback loop which receives a measured tension signal from a tension sensor, then compares it with a reference tension representing the desired tension, and finally modulates the braking action in such a way as to minimize the difference between the reference tension and the measured tension.
  • Certain particular processes such as sewing the heels of socks, require that the yarn fed to the machine is periodically recovered and then returned. This operation is usually carried out by a dedicated yarn-recovering device arranged upstream of the machine.
  • a yarn-recovering device of this type is described in EP 1 741 817 and generally comprises a motorized reel having an oblique passage for the yarn defined therein.
  • the passage extends between an axial inlet port formed on an end surface of the reel, and an outlet port formed on the cylindrical lateral surface of the reel.
  • a drawback of a line constituted as above is that it is rather expensive, mainly because a textile machine is usually served by dozens yarns and, therefore, the cost of each device added downstream of the feeder (brake, yarn-recovering device, etc.) must be multiplied by the number of yarns.
  • a yarn-feeding apparatus 10 comprises a weft feeder 11 provided with a stationary drum 12.
  • the yarn, which is unwound from drum 12 upon request from a general downstream machine 17, is subject to the action of a stabilizing brake which maintains the delivered yarn under tension.
  • the stabilizing brake typically comprises a frustoconical hollow member 18 which is biased with its inner surface against the delivery edge of drum 12 by manually adjustable elastic means 19.
  • the amount of yarn stocked on drum 12 is controlled by a triad of sensors.
  • a first sensor S1 preferably a Hall sensor, detects the passage of magnets M integral with the flywheel, in order to measure the amount of yarn wound on the drum as well as the winding speed.
  • a third sensor, S3, preferably an optical sensor, provides an UWP pulse per each loop unwound from the drum.
  • a yarn-recovering device 20 of the type described in EP 1 741 817 is arranged, which is shown in detail in Figs. 2 to 4 .
  • yarn-recovering device 20 comprises a reel 22 keyed to a driving shaft 24 of a motor 26, preferably a stepping motor or, alternatively, a brushless motor provided with an absolute sensor which allows its real position to be determined, by means of techniques which are conventional in the field.
  • Reel 22 is arranged with its axis A sloping at a first angle ⁇ with respect to the direction of the incoming yarn, which direction is indicated by arrow D, so that its end surface 22a facing away from motor 26 obliquely faces the incoming yarn.
  • Reel 22 has a cylindrical seat 28 extending coaxially from an axial opening 29 formed on end surface 22a of reel 22.
  • a passage 30 is defined within reel 22, which extends between an inlet port 30a opening to cylindrical axial seat 28, and an outlet port 30b opening to the lateral winding surface 22b of the reel.
  • Passage 30 is rectilinear and is sloping at a second angle ⁇ substantially equal to first angle ⁇ with respect to axis A of the reel.
  • the edge of axial seat 28 and outlet port 30b have respective internally beveled, ceramic wearproof rings 32, 33 applied thereto.
  • An inlet yarn-guide eyelet 34 and an outlet yarn-guide eyelet 36 are arranged upstream and downstream of reel 22 respectively, at the same level of ceramic ring 32.
  • yarn F passes through upstream yarn-guide eyelet 34, axial seat 28, passage 30, and downstream yarn-guide eyelet 36.
  • yarn-recovering device 20 is not activated by a request from machine 17, based on the need of recovering/returning yarn. Instead, the angular position of reel 22 about its axis A is continuously adjusted on the basis of braking signals BI received from a control unit CU, in order to apply a braking action by friction to the yarn, which braking action is caused by the yarn creeping against the contact surfaces of reel 22 and yarn-guide eyelets 34, 36, and increases in intensity with increasing angle of rotation ⁇ of the reel with respect to an angular position of minimum braking; the latter, in the example of Fig. 3 , is defined as the position in which passage 30 is aligned to inlet/outlet yarn-guide eyelets 34, 36, so that the reel does not interfere with the path of the yarn.
  • control unit CU is programmed to modulate the braking action in order to maintain the yarn tension substantially constant.
  • a tension sensor 38 arranged downstream of yarn-recovering device 20 measures the tension of yarn F unwinding from the drum and sends a corresponding measured tension signal T_meas to control unit CU.
  • the latter comprises a tension control block TC which is programmed to compare measured tension T_meas with a reference tension T_ref, and to adjust the above braking signal BI - from which the rotation angle of the reel is dependent - in order to minimize the difference between them.
  • yarn-recovering device 20 In case of a sudden drop in tension, e.g., due to a release of yarn from downstream machine 17 in particular processes, or to a yarn breakage, yarn-recovering device 20 will automatically perform its yarn-recovering function, because reel 22 will keep on rotating and winding the yarn upon itself, until the yarn tension will reach the reference value T_ref again. Therefore, also while recovering, the tension will automatically tend to the constant reference value T_ref.
  • yarn-recovering device 20 is connected to send a position signal P( ⁇ ), which is indicative of the instantaneous angular position ⁇ of the device, to control unit CU.
  • yarn-recovering device 20 also operates as a brake, with consequent reduction in terms of costs and dimensions.
  • stabilizing brake 18 is adjusted in such a way as to apply a very slight braking action to the unwinding yarn, such that the tension of the yarn unwinding from the drum is lower than the minimum operative tension expected.
  • the controlled brake will effectively adjust the braking action over the entire range of possible operative tensions.
  • FIG. 5 illustrates the tension T of the yarn as a function of the rotation angle ⁇ of reel 22, as measured during some tests at different speeds and with different tensions of the incoming yarn, the latter being varied by adjusting stabilizing brake 18.
  • Rotation angle 0° represents the above-described position of minimum braking shown in Fig. 3 .
  • control unit CU is programmed to activate a safety function when the feeder is disabled.
  • reel 22 is maintained at an angular position such that it applies a braking action to the yarn that is slightly weaker with respect to the position corresponding to the reference signal. Accordingly, when the feeder is disabled, the yarn will be always maintained slightly under tension and, when the feeder will be enabled again, it will be immediately fed to textile machine 17 without undergoing tension peaks, thereby reducing the risk of yarn breakage.
  • tension control block TC is normally disabled, and control unit CU comprises a speed evaluator block SE, which processes the signals UWP from third sensor S3 in order to compute the real yarn comsumption speed on the basis of the time interval between said UWP pulses, and generates an enabling signal LE which enables the normal operation of tension control block TC only when said speed is > 0.
  • control unit CU comprises a speed evaluator block SE, which processes the signals UWP from third sensor S3 in order to compute the real yarn comsumption speed on the basis of the time interval between said UWP pulses, and generates an enabling signal LE which enables the normal operation of tension control block TC only when said speed is > 0.
  • the above-described safety function is enabled.
  • speed evaluator block SE processes the signals UWP' from first sensor S1, on the basis of the time interval between such pulses UWP' generated by the sensor, and is programmed to generate an enabling signal LE which enables tension control block TC only when said speed is > 0.
  • the safety function is enabled.
  • the signal generated by first sensor S1, which detects the rotation of yarn-winding flywheel 14, is considered as indicative of the real comsumption of yarn, because it is assumed that, when feeder 10 is operative, the amount of yarn drawn from spool 16 corresponds to the amount of yarn delivered.
  • the described embodiments show the yarn-recovering device positioned in such a way that it can assume a non-interfering position, as illustrated in Figs. 2 and 3 .
  • the yarn-recovering device may also be positioned with its end surface 22a facing the incoming yarn at right angles.
  • the reel at its position of minimum braking, which in the described examples corresponds to a non-interfering position as shown in Fig.
  • inlet port 30a of passage 30 is very close to the axis of rotation of reel 22, so that the incoming yarn does not swing and, therefore, is not subject to tension fluctuations during the rotation of the reel, however, for some applications, slight fluctuations could be tolerated and therefore inlet port 30a could also be positioned farther than illustrated from axis A.
  • passage 30 connecting the inlet port to the outlet port could have various shapes and sizes. For example, if the reel is made hollow, the passage could be the empty area within the reel. Moreover, passage 30 could directly lead to the front surface of the reel, without needing any cylindrical axial seat 28.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Looms (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Claims (11)

  1. Garnzuführungsvorrichtung für Textilmaschinen, mit:
    - einem Schussgerät (11), das mit einer stationären Trommel (12) ausgerüstet ist, auf die ein von einer Textilmaschine (17) abziehbares Garn (F) gewickelt ist,
    - einer Stabilisierungsbremse (18), die dazu angeordnet ist, das sich von der Trommel (12) abwickelnde Garn unter Spannung zu halten, während es von der Textilmaschine (17) abgezogen wird,
    - einer gesteuerten Bremseinrichtung (20), die stromabwärts der Stabilisierungsbremse (18) zum Aufbringen einer modulierten Bremswirkung auf das Garn angeordnet ist,
    - einer Steuereinheit (CU), die zum Erzeugen von Bremssignalen (B1) als Funktion gemessener, von einem Zugspännungssensor (38) empfangener Zugspannungssignale (T_meas) programmiert ist,
    dadurch gekennzeichnet, dass die gesteuerte Bremseinrichtung eine motorisierte Spule (32) mit einer Einlassöffnung (30a), die mit einer auf einer Stirnfläche (22a) der Spule festgelegten Öffnung (29) in Verbindung steht, und eine Auslassöffnung (30b) aufweist, die auf der seitlichen Wickelfläche (22b) der Spule gebildet ist, wobei ein Dürchlass (28) von dem sich zwischen den Öffnungen erstreckenden Garn (F) durchlaufen wird, und wobei die Spule (22) zum Einstellen ihrer Winkelstellung um ihre Achse (A) auf der Grundlage der Bremssignale (BI) angetrieben ist, wodurch eine durch Reibung erzeugte Bremswirkung auf das Garn aufgebracht wird, die von der Reibung des Garns gegen die Kontaktflächen der Spule (22) bestimmt ist und die in ihrer Stärke mit zunehmendem Drehwinkel (γ) der Spule (22) bezüglich einer Winkelstellung minimalen Aremsens zunimmt.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Steuereinheit (CU) dazu programmiert ist, die Spule (22) bei Vollendung einer von einem Benutzer eingestellten Maximalzahl an Umdrehungen anzuhalten.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Steuereinheit (CU) ferner dazu programmiert ist, bei Vollendung der Maximalzahl an Umdrehungen ein Alarmsignal zu erzeugen.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Spule (22) mit ihrer Drehachse (A) unter einem ersten Winkel (α) bezüglich der Richtung (D) des einlaufenden Garns (F) geneigt angeordnet ist und die zwischen der Einlassöffnung (30a) und der Auslassöffnung (30b) festgelegte Achse bezüglich der Achse (A) der Spule unter einem zweiten Winkel (β) geneigt ist, der im Wesentlichen gleich dem ersten Winkel (α) ist.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Spule (22) in der Winkelstellung minimalen Bremsens in eine Stellung gedreht ist,
    die die Laufbahn des Garns (F) nicht stört.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass sie ein Paar Garnführungsösen (34, 36) aufweist, die stromaufwärts bzw. stromabwärts der Spule (22) angeordnet sind, um das Garn beim Abbremsen zu führen.
  7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Einlassöffnung (30a) zu einem zylindrischen Sitz (28) hin offen ist, der sich koaxial von der axialen Öffnung (29) aus erstreckt.
  8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass ein erster verschleißfester Ring (32) auf den Rand des zylindrischen Sitzes (28) aufgebracht ist.
  9. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass ein zweiter verschleißfester Ring (33) auf die Auslassöffnung (30b) appliziert ist.
  10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Steuereinheit (CU) einen Zugspannungssteuerblock (TC) aufweist, der dazu programmiert ist, die gemessene Zugspannung (T_meas) mit einer Bezugsspannung (T_ref) zu vergleichen und das Bremssignal (BI) so einzustellen, dass die Differenz zwischen ihnen minimiert ist.
  11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Steuereinheit (CU) dann, wenn der Garnzuführer nicht arbeitet, dazu programmiert ist, die Spule (22) in einer Winkelstellung zu halten, derart, dass sie eine Bremswirkung auf das Garn ausübt, die geringfügig schwächer als die der Bezugsspannung (T_ref) entsprechende Bremswirkung ist.
EP20120007753 2012-02-22 2012-11-16 Garnzuführungsvorrichtungen mit geregelter Spannung für Textilmaschinen, mit Garnrückgewinnungsfunktion Active EP2631339B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000156A ITTO20120156A1 (it) 2012-02-22 2012-02-22 Apparato di alimentazione di filato a tensione controllata per macchine tessili, con funzione di recupero del filato.

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Publication Number Publication Date
EP2631339A1 EP2631339A1 (de) 2013-08-28
EP2631339B1 true EP2631339B1 (de) 2014-06-11

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IT (1) ITTO20120156A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104047096B (zh) * 2014-06-23 2015-07-15 湖州石淙印染有限公司 一种织机捕纬切割装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4240710A1 (de) * 1992-12-03 1994-06-09 Iro Ab Verfahren zum Steuern eines Fadenliefersystems und Fadenliefersystems
IT1260645B (it) * 1993-04-08 1996-04-22 Lgl Electronics Spa Dispositivo di frenatura modulata del filato per apparecchi alimentatori di trama
IT1310749B1 (it) * 1999-11-30 2002-02-22 Lgl Electronics Spa Metodo e dispositivo di controllo di freni di trama elettrocomandatiper la regolazione automatica della tensione meccanica del filo di
EP1258550B1 (de) * 2001-05-11 2006-07-12 Kabushiki Kaisha Toyota Jidoshokki Schussfadeneintragskontrollvorrichtung in eine Düsenwebmaschine
DE10151780C1 (de) * 2001-10-19 2003-05-22 Dornier Gmbh Lindauer Verfahren und Vorrichtung zur Beeinflussung der Fadenbremskraft einer zwischen einem Garnvorratssystem und einem Fadenspeicher einer Webmaschine angeordneten Schussfadenbremse
JP4003710B2 (ja) * 2003-07-23 2007-11-07 株式会社豊田自動織機 ジェットルームにおける緯入れ制御装置
ITTO20050469A1 (it) * 2005-07-07 2007-01-08 L G L Elecrtronics S P A Dispositivo di recupero del filato per macchine tessili
ITTO20050781A1 (it) * 2005-11-04 2007-05-05 L G L Elecrtronics S P A Dispositivo di frenatura a recupero di trama per linee di tessitura
EP1865596A1 (de) * 2006-06-05 2007-12-12 L.G.L. Electronics S.p.A. Induktionsmotorbetriebene Fadenliefergerät
EP2031106B1 (de) * 2007-08-31 2010-02-24 L.G.L. Electronics S.p.A. Verfahren zur Spannungskontrolle eines Garnes, das von einem negativen Liefergerät an eine Textilmaschine geliefert wird, und Vorrichtung zur Durchführung des Verfahrens
EP2169099A1 (de) * 2008-09-25 2010-03-31 L.G.L. Electronics S.p.A. Negativer Garnzuführer mit Schussfadenbremsvorrichtung
EP2270269B1 (de) * 2009-07-03 2011-10-26 L.G.L. Electronics S.p.A. Verfahren zur Erkennung des Anhaltens der Garnabwicklung von einer Garnzufuhr mit stationärer Trommel

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ITTO20120156A1 (it) 2013-08-23
CN103290607B (zh) 2015-11-18
EP2631339A1 (de) 2013-08-28
CN103290607A (zh) 2013-09-11

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