EP3392384B1 - Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen und zuführvorrichtung mit solch einer schussfadenbremsvorrichtung - Google Patents

Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen und zuführvorrichtung mit solch einer schussfadenbremsvorrichtung Download PDF

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Publication number
EP3392384B1
EP3392384B1 EP18161943.8A EP18161943A EP3392384B1 EP 3392384 B1 EP3392384 B1 EP 3392384B1 EP 18161943 A EP18161943 A EP 18161943A EP 3392384 B1 EP3392384 B1 EP 3392384B1
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EP
European Patent Office
Prior art keywords
support
braking device
weft
weft braking
yarn
Prior art date
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Application number
EP18161943.8A
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English (en)
French (fr)
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EP3392384A1 (de
Inventor
Giorgio Bertocchi
Pietro Zenoni
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.)
LGL Electronics SpA
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LGL Electronics SpA
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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
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
    • D04B15/484—Yarn braking means acting on the drum
    • 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
    • D03D47/366—Conical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/60—Coupling, adapter or locking means

Definitions

  • the present invention relates to a weft braking device for accumulator yarn feeders and a feeder using such weft braking device.
  • the yarn can be fed to a textile machine by an "accumulator" feeder.
  • An accumulator feeder is generally provided with a drum that supports, wound thereon, a plurality of yarn loops that are adapted to be unwound on request of the textile machine. As the yarn is unwound from the drum, it can be reloaded by a motorized arm which rotates like a swivel about an axis that is coaxial to the axis of the drum, or, in other types of feeders, by rotating the drum itself.
  • the yarn being unwound from the drum passes through a weft braking device which controls its tension.
  • the weft braking device can generally comprise a frustum-shaped hollow braking body which is pushed with its inner surface against the output end of the drum. Therefore, the yarn unwinding from the feeder slides pressed between the drum and the braking body, thus receiving a braking action by friction.
  • the braking body can be pushed against the drum by actuation means which are retroactively controlled by a control unit, on the basis of the signal received from a tension sensor which is arranged downstream of the weft braking device, so as to stabilize the tension of the unwinding yarn at a preset value.
  • a radial system of springs may be interposed between the frustum-shaped braking body and the actuation means, with the inner ends of these springs anchored to the smaller base of the braking body, and their outer ends anchored to an annular support.
  • the latter can slide on two lateral guides and is functionally connected to the actuation means in an intermediate eccentric position between the guides.
  • the foregoing configuration has the drawback that the thrust exerted in the eccentric position by the actuator on the annular support generates a torque that stresses the lateral guides, increasing wear and making frequent lubrication necessary.
  • the eccentricity of the thrust also indirectly influences the braking body, so as to compromise the evenness of the braking action along the circumference of contact between the braking body and the drum.
  • a drawback of conventional systems of the above type is that the weight of the braking body, which is supported in a cantilever fashion with respect to the articulation axes of the joint, has an unbalancing effect that compromises the evenness of the braking action along the circumference of contact between the braking body and the drum.
  • the main aim of the present invention is to provide a weft braking device for accumulator yarn feeders that overcomes the above mentioned drawbacks of conventional systems, so as to generate a more precise and even braking action along the circumference of contact between the braking body and the drum.
  • Another object of the invention is to simplify the operations of substitution of the braking body in the weft braking device.
  • an accumulator yarn feeder 10 comprises a drum 12 which supports, wound thereon, a yarn Y that is adapted to be unwound on request of a generic downstream machine (not shown).
  • a motorized arm that rotates in the manner of a swivel (not shown) winds new yarn, taking it from a distaff upstream (not shown).
  • the yarn could be rewound by rotating the drum 12 which, in such case, would need to be motorized.
  • the yarn Y being unwound from the drum 12 passes through a weft braking device 14 which controls its mechanical tension.
  • the weft braking device 14 comprises an annular braking body 16 which is coaxially pushed against the output end 12a of the drum by actuation means that act axially, advantageously, a linear actuator 18 using permanent magnets.
  • the braking body 16 is constituted by a hollow frustum-shaped membrane, which is conventional.
  • the linear actuator 18 is retroactively controlled by a control unit CU, on the basis of the signal received from a tension sensor 19 which is arranged downstream of the weft braking device 14, so as to stabilize the tension of the yarn Y dispensed by the feeder 10 at a preset value.
  • the linear actuator 18 is supported by an arm 20, which is integral with the body of the feeder 10 and which extends parallel to the axis of the drum 12, and is provided with a hollow shaft 22 through which passes the yarn Y that is unwound from the drum 12.
  • an articulated joint 24 Interposed between the braking body 16 and the drum 12 is an articulated joint 24.
  • the articulated joint 24 comprises an internal annular support 26 to which the frustum-shaped body 16 is coaxially connected, an external annular support 28 which is pivoted to the internal annular support 26 about a first articulation axis X, and a supporting arm 30 which is pivoted to the external annular support 28 about a second articulation axis Z which is perpendicular to and intersects with the first axis X at a point P that is arranged along the geometric axis of the braking body 16.
  • the arm 30 is provided with a central hole 32 through which it is connected coaxially to the operational end 22a of the hollow shaft 22 ( Figure 1 ).
  • the articulated joint 24 kinematically provides a ball joint that is capable of compensating any misalignments between the braking body 16 and the drum 12.
  • the articulated joint 24 is functionally associated with elastic means which act against the torque generated by the weight of the braking body 16 in order to balance it.
  • the elastic means comprise an annular lamina 34 which is fixed coaxially to the external annular support 28.
  • the annular lamina 34 is provided with four elastic wings 34a, 34b, 34c, 34d with an elongated profile, which extend circumferentially inside the annular extension of the lamina in equally-spaced angular positions and which have one end connected monolithically to the annular body of the lamina 34, and an opposite, free end.
  • the first two mutually opposite wings 34a, 34b of the four elastic wings urge, in mutually opposing directions, with their free ends, on two respective first levers 35a, 35b which are integral with the internal annular support 26, so as to generate two mutually opposing elastic torques on the internal annular support 26 which act against the rotation about the first axis X.
  • the second two mutually opposite wings 34c, 34d of the four elastic wings urge, in mutually opposing directions, with their free ends, on two respective second levers 35c, 35d which are integral with the arm 30, so as to generate two mutually opposing elastic torques on the arm 30 which act against the rotation about the second axis Z.
  • the levers 35a, 35b and 35c, 35d have respective protruding ends that are shaped so as to preload the wings 34a, 34b and 34c, 34d. Therefore these wings, with the articulated joint 24 in the assembled configuration, are not coplanar with the annular body of the lamina 34.
  • Figure 5 shows a detail of the wing 34d which, with its protruding end 34d', acts on the end of the lever 35d which is integral with the arm 30.
  • the annular lamina 34 is advantageously made of metallic material, e.g., steel for springs, and is co-molded together with the external annular support 28.
  • the arm 30 is pivoted to the external annular support 28 by way of a pair of pivots 38a, 38b which are inserted under pressure into respective holes which are provided in the two sides.
  • a similar connection (not shown) is provided between the external annular support 28 and the internal annular support 26.
  • the use of four wings that act in opposition in pairs about the two axes X, Z is advantageous, in that it makes it possible to compensate the torque generated by the weight of the braking body even when the axis X of the articulated joint 24 is not horizontal, for example because the feeder 10 is arranged obliquely. Furthermore, the presence of four wings makes it possible to transmit an even elastic force on the circumference of contact.
  • the braking body 16 is connected to the internal annular support 26 by way of a ring 42 coupled to the smaller base of the braking body 16.
  • a first triplet of permanent magnets (not shown) are embedded in respective protruding tabs 42a, 42b, 42c of the ring 42, and are in a relationship of magnetic attraction with a second triplet of permanent magnets 26a, 26b, 26c ( Figures 3 and 4 ) which are mounted on the internal annular support 26.
  • weft braking device 14 fully achieves the set aims.
  • elastic means into the articulated joint 24 to oppose the torque generated by the weight of the braking body 16, the braking action is precise and even along the circumference of contact between the braking body 16 and the drum 12.
  • the magnetic coupling between the braking body 16 and the internal annular support 26 makes the operations to substitute the braking body 16 easy and rapid.
  • Figure 6 shows an alternative embodiment of the invention, which differs from the previous one only in the actuation means.
  • the arm 130 of the articulated joint 124 is connected coaxially to one end 122a of a hollow stem 122 which is provided with an external flange 122b.
  • a slider 142 is fitted slideably over the hollow stem 122 and is connected to the shaft 118a of a stepper linear actuator 118.
  • a spring 146 is functionally interposed between the flange 122b and the slider 142.
  • adjusting the position of the slider 142 by way of the stepper linear actuator 118 adjusts the axial force exerted by the braking body 116 on the drum and, as a consequence, the braking force.
  • the position of the slider can be manually adjusted.
  • the stepper linear actuator can be substituted by manual means of stressing, e.g., a leadscrew transmission that can be actuated with a knob; or, by making the hollow stem threaded, the slider can be substituted by a simple threaded ferrule screwed onto the stem and acting on the spring in place of the slider.
  • the arrangement of the elements of the articulated joint could be inverted; that is to say, the braking body could be connected to the external annular support and the arm to the internal annular support.
  • annular shape of the supports of the joint is advantageous in terms of structural rigidity and for mating with the other elements of the weft braking device, but such form is not indispensable; for example, the external annular support could be substituted by a cross-shaped support.
  • the elastic means in the articulated joint could also be provided differently from the embodiment described; e.g., helical springs or other types of springs could be functionally interposed between the elements of the articulated joint.
  • the braking body which in the embodiment described herein is constituted by a frustum-shaped membrane, could also be substituted by a different type of annular element, e.g., a brush.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (13)

  1. Eine Schussfadenbremsvorrichtung für eine Fadenzuführvorrichtung (10), die mit einer Walze (12) ausgestattet ist, ausgebildet, um darauf aufgewickelt einen Faden (Y) zu tragen, der auf Anfrage einer stromabwärts angeordneten Maschine abgewickelt werden kann, Folgendes umfassend:
    - einen ringförmigen Bremskörper (16) der koaxial von axial wirkenden Antriebsmitteln gegen ein Ausgabeende (12a) der Walze (12) gedrückt wird, und
    - eine Gelenkverbindung (24) die funktionell zwischen den Antriebsmitteln (18) und dem Bremskörper (16) angeordnet ist, wobei das Gewicht des Bremskörpers (16) ein Drehmoment um mindestens eine Gelenkachse (X, Z) der Verbindung (24) erzeugt,
    wobei die Verbindung (24) gelenkig um zwei Gelenkachsen (X, Z) angeordnet ist, die senkrecht zueinander sind und sich in einem Punkt (P) schneiden, der entlang der geometrischen Achse des Bremskörpers (16) angeordnet ist, und einen ersten Träger (26), einen zweiten Träger (28), der um eine erste der Gelenkachsen (X) drehgelenkig mit dem ersten Träger (26) verbunden ist, und einen dritten Träger (30) umfasst, welcher um eine zweite der Gelenkachsen (Z) drehgelenkig mit dem zweiten Träger (28) verbunden ist,
    dadurch gekennzeichnet, dass sie elastische Mittel (34) umfasst, welche funktionell zwischen den Elementen der Gelenkverbindung (24) angeordnet sind, und dem Drehmoment entgegenwirken, dass durch das Gewicht des Bremskörpers (16) erzeugt wird, um es auszugleichen.
  2. Die Schussfadenbremsvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass der Bremskörper (16) mit dem ersten Träger (26) verbunden ist.
  3. Die Schussfadenbremsvorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass die elastischen Mittel mindestens einen elastischen Flügel (34a, 34b, 34c, 34d) umfassen, welcher funktionell zwischen dem zweiten Träger (28) und dem ersten Träger (26) bzw. dem dritten Träger (30) angeordnet ist.
  4. Die Schussfadenbremsvorrichtung gemäß Anspruch 3, dadurch gekennzeichnet, dass der elastische Flügel (34a, 34b, 34c, 34d) ein Ende hat, dass an dem zweiten Träger (28) befestigt ist und mit einem gegenüberliegenden freien Ende desselben auf einen entsprechenden Hebel (35a, 35b, 35c, 35d) drückt, der mit dem ersten Träger (26) bzw. dem dritten Träger (30) integral ist, wobei der Hebel (35a, 35b, 35c, 35d) geformt ist, um den jeweiligen elastischen Flügel (34a, 34b, 34c, 34d) vorzuspannen.
  5. Die Schussfadenbremsvorrichtung gemäß Anspruch 3 oder 4, dadurch gekennzeichnet, dass der elastische Flügel (34a, 34b, 34c, 34d) sich monolithisch von einem ringförmigen Plättchen (34) erstreckt, das koaxial an dem zweiten Träger (28) befestigt ist.
  6. Die Schussfadenbremsvorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, dass das ringförmige Plättchen (34) aus Metallmaterial besteht und gemeinsam mit dem äußeren ringförmigen Träger (28) überformt ist.
  7. Die Schussfadenbremsvorrichtung gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass sie mindestens ein Paar der elastischen Flügel (34a, 34b, 34c, 34d) umfasst, die in entgegengesetzte Richtungen wirken, um zwei einander entgegengesetzte elastische Drehmomente, um eine entsprechende der beiden Achsen (X, Z) zu erzeugen.
  8. Die Schussfadenbremsvorrichtung gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass der erste Träger (26) und der zweite Träger (28) ringförmige Profile haben und das eine in das andere eingesetzt ist.
  9. Die Schussfadenbremsvorrichtung gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass der Bremskörper (16) mit dem ersten Träger (26) über magnetische Verbindungsmittel (40a, 40b, 40c) verbunden ist.
  10. Die Schussfadenbremsvorrichtung gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass die Antriebsmittel einen Linearaktor (18) mit Dauermagneten umfassen, der mit einer Hohlwelle (22) ausgestattet ist, durch welche der Faden (Y) verläuft und die rückgekoppelt von einer Steuereinheit (CU), auf der Grundlage des Signals gesteuert wird, dass von einem Spannungssensor (19) empfangen wird, welcher stromabwärts von der Schussfadenbremsvorrichtung angeordnet ist, um die Spannung des Fadens, der von der Zuführvorrichtung abgegeben wird auf einem vordefinierten Wert zu stabilisieren.
  11. Die Schussfadenbremsvorrichtung gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass die Antriebsmittel einen hohlen Schaft (122) umfassen, der mit der Welle (118a) einstellbare Antriebsmittel (118) mit Anordnung zusätzlicher elastischer Mittel (146) dazwischen verbunden ist.
  12. Die Schussfadenbremsvorrichtung gemäß Anspruch 11, dadurch gekennzeichnet, dass die einstellbaren Antriebsmittel einen abgestuften Linearaktor (118) umfassen.
  13. Eine Fadenzuführvorrichtung, die mit einer Walze (12) ausgestattet ist, welche ausgebildet ist, um darauf aufgewickelt einen Faden (Y) zu tragen, der auf Anforderung durch eine stromabwärts angeordnete Maschine abgewickelt werden kann, dadurch gekennzeichnet, dass sie eine Schussfadenbremsvorrichtung gemäß Anspruch 1 umfasst.
EP18161943.8A 2017-04-20 2018-03-15 Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen und zuführvorrichtung mit solch einer schussfadenbremsvorrichtung Active EP3392384B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000043202A IT201700043202A1 (it) 2017-04-20 2017-04-20 Dispositivo frena-trama per alimentatori di filato ad accumulo, ed alimentatore impiegante tale dispositivo frena-trama

Publications (2)

Publication Number Publication Date
EP3392384A1 EP3392384A1 (de) 2018-10-24
EP3392384B1 true EP3392384B1 (de) 2020-11-25

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EP18161943.8A Active EP3392384B1 (de) 2017-04-20 2018-03-15 Schussfadenbremsvorrichtung für speicherfadenzuführvorrichtungen und zuführvorrichtung mit solch einer schussfadenbremsvorrichtung

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EP (1) EP3392384B1 (de)
CN (1) CN108728994B (de)
IT (1) IT201700043202A1 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1133900B (it) 1980-10-15 1986-07-24 Roy Electrotex Spa Mezzi per effettuare la frenatura del filato in uscita in dispositivi alimentatori di filato a tensione costante e regolabile,particolarmente per macchine tessili
IT1264844B1 (it) 1993-06-17 1996-10-17 Roj Electrotex Nuova Srl Alimentatore di filo
DE9406102U1 (de) * 1994-04-13 1995-08-10 Sobrevin Société de brevets industriels-Etablissement, Vaduz Fadenspeicher mit Fadenabzugsbremse
US5546994A (en) * 1994-10-14 1996-08-20 Sobrevin Societe De Brevets Industriels-Etablissement Thread storage drum with frustoconical brake strip
DE19649220A1 (de) * 1996-11-27 1998-05-28 Iro Ab Fadenliefergerät mit einer Fadenbremse
ITTO20040105U1 (it) * 2004-08-05 2004-11-05 Lgl Electronics Spa Alimentatore di trama per telai di tessitura provvisto di dispositivo di frenatura auto-regolante
ITTO20050279A1 (it) * 2005-04-27 2006-10-28 Lgl Electronics Spa Dispositivo di frenatura del filato in alimentatori di trama per macchine tessili
ITTO20050063U1 (it) * 2005-05-18 2006-11-19 L G L Elecrtronics S P A Perfezionamento ad un dispositivo di frenatura del filato in alimentatori di trama per macchine tessili

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
IT201700043202A1 (it) 2018-10-20
CN108728994B (zh) 2021-09-24
EP3392384A1 (de) 2018-10-24
CN108728994A (zh) 2018-11-02

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