EP3736361B1 - Fadensauganordnung für eine anspinneinheit einer textilmaschine - Google Patents

Fadensauganordnung für eine anspinneinheit einer textilmaschine Download PDF

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Publication number
EP3736361B1
EP3736361B1 EP20172829.2A EP20172829A EP3736361B1 EP 3736361 B1 EP3736361 B1 EP 3736361B1 EP 20172829 A EP20172829 A EP 20172829A EP 3736361 B1 EP3736361 B1 EP 3736361B1
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EP
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Prior art keywords
suction
venturi jet
cop
broken yarn
suction pipe
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EP20172829.2A
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English (en)
French (fr)
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EP3736361A1 (de
Inventor
Jeganathan Pasupathy
Masthigoundenpathy Giriraj Deepan Marudachalam
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.)
Lakshmi Machine Works Ltd
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Lakshmi Machine Works Ltd
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H15/00—Piecing arrangements ; Automatic end-finding, e.g. by suction and reverse package rotation; Devices for temporarily storing yarn during piecing
    • D01H15/013—Carriages travelling along the machines
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H15/00—Piecing arrangements ; Automatic end-finding, e.g. by suction and reverse package rotation; Devices for temporarily storing yarn during piecing

Definitions

  • the present invention relates to textile ring spinning machines.
  • the invention relates to yarn suction arrangement for an automatic yarn piecing unit in ring spinning machines.
  • the invention relates to broken yarn picking arrangement to detach the broken yarn end from the spinning cop to enable automatic piecing operation in textile ring spinning machines.
  • Ring spinning machines are the final yarn producing machines in textile spinning mills, which are very crucial machines.
  • the said ring spinning machines produces the resultant form of cotton in spinning line, so called yarn.
  • Yarn breakage occurs frequently in ring spinning machines which is a major setback spinning industry is facing worldwide. Yarn breakage has to be continuously monitored and broken yarn has to be pieced then and there by the workers. The yarn breakage occurs due to various parameters of yarn and machine and it is unavoidable.
  • human labours continuously monitor yarn breakages and perform manual piecing of broken yarns round the clock walking along the pathways of the ring frames. This has to be done for a machine frame normally consisting of more than 1600 spindles and about 75 metres long. After successful piecing of broken yarn, yarn spinning sequence has to be restarted then and there for every broken yarn spindles, in order to avoid wastage of yarn.
  • the automatic piecing unit is in the form of a movable vehicle with guiding means.
  • the said piecing vehicle stops at respective broken yarn spindle position which requires piecing attention.
  • the piecing unit in general moves longitudinally over the machine frame aisles.
  • the piecing vehicle stops in front of the spindle position of ring spinning machine.
  • the broken yarn end which is available in the spinning cop has to be found and detached from the cop and lifted above to enable piecing operation.
  • the said detaching of yarn from spinning cop automatically is a very difficult task in general.
  • the cylindrical suction nozzle with mouth / opening extends from the piecing unit and is positioned usually at a predetermined distance above the top of the spinning cop to suck the yarn end from the cop.
  • suction motors are used for providing the required suction.
  • the existing suction motors are large in size and expensive.
  • suction motor occupies considerable space in automatic piecing unit due to its size. This results in increased mass of the automatic piecing unit in addition to increased cost.
  • the present invention provides an improved arrangement for picking the broken yarn end from the spinning cop to enable automatic piecing in ring spinning machines.
  • the main object of the present invention is to provide an improved automatic piecing unit for textile ring spinning machines.
  • EP 3 708 701 A1 is an Art. 54(3) EPC document and discloses an automatic piecing unit for piecing broken yarns in a ring spinning machine, the automatic piecing unit comprising a suction assembly for capturing a broken yarn end from a cop, wherein the suction assembly includes a horizontal suction tube, to suck the broken yarn end from the cop.
  • EP 3 521 491 A1 is also an Art. 54 (3) EPC document and discloses an automatic piecing unit for piecing broken yarns in a ring spinning machine, the automatic piecing unit comprising a suction assembly for sucking a broken yarn end from a cop, wherein the suction assembly includes a horizontal suction tube movable in a vertical guide, to suck the broken yarn end from the cop from front portion in horizontal direction.
  • JP 2018 012 902 A discloses a yarn end capturing device suitable for air jet spinning machine, comprising a suction assembly, suitable for sucking yarn end from package for piecing with air jet spinning nozzle.
  • Another object of the present invention is to provide a mechanism for improved yarn picking which saves space and reduces cost in the automatic piecing unit of the textile ring spinning machines.
  • Another object of the present invention is to provide a broken yarn picking arrangement from the spinning cop with improved suction arrangement in the automatic piecing unit of the textile ring spinning machines.
  • the present invention provides an automatic piecing unit according to claim 1.
  • the first venturi jet (5a) and the second venturi jet (5b) have multiple flow control, instead of a suction motor.
  • plurality of air jets are provided around the bottom of the cop (4) to assist in lifting the broken yarn end (not shown).
  • the present invention further provides, a method for automatic piecing of broken yarns according to claim 9.
  • FIG. 1 showing a schematic side view of a suction assembly of an automatic piecing unit (1)
  • the automatic piecing unit (1) moves longitudinally along the aisle of a ring spinning machine.
  • the ring spinning machine is capable of winding yarn onto a bobbin mounted to spinning spindle, so called cop (4).
  • cop (4) spinning spindle
  • a suction assembly of the automatic piecing unit (1) provides the required suction to pick the broken yarn end from the cop (4).
  • the suction assembly comprises a suction pipe (2) that may be cylindrical in shape, and may having a suction mouth / opening (3).
  • the suction pipe (2) is displaced at a predetermined height at the top of the cop (4) so as to suck the broken yarn end from the cop (4).
  • the suction assembly is provided with a venturi jet instead of suction motor, for picking the broken yarn end from the cop (4).
  • a venturi jet instead of suction motor, for picking the broken yarn end from the cop (4).
  • Two venturi jets i.e. a first venturi jet (5a) and a second venturi jet (5b) are used to suck the broken yarn end from the cop (4).
  • multiple venturi jets can also be used.
  • the first venturi jet (5a) is fixed adjacent to the suction pipe (2).
  • the second venturi jet (5b) is fixed away from the suction mouth (3) at the farther end of the suction assembly as shown in Fig. 1 .
  • Compressed air from a pressure supply port or the ring spinning machine suction unit or spinning mill suction unit or any source may be passed inside the first venturi jet (5a) and the second venturi jet (5b) sequentially.
  • a constricted section of the first venturi jet (5a) increases the flow velocity of the compressed air. Due to this process, a vacuum is created in the suction mouth (3), which causes suction in the upward direction due to the Venturi effect, to lift the broken yarn end from cop (4).
  • working sequence of the suction assembly is as described hereinafter.
  • the compressed air is passed inside the first venturi jet (5a) through the inlet provided in the first venturi jet (5a).
  • the compressed air leaves the venturi jet (5a) at an outlet towards the inner side of the suction pipe (2), thereby creating a suction effect or vacuum in the upward direction inside the suction mouth (3).
  • the varying diameter profile of venturi inner pipe from one end to another creates the desired suction effect in upward direction. Due to the suction effect or vacuum, the broken yarn end from the cop (4) is picked and sucked inside the suction mouth (3) into the suction assembly. The sucked broken yarn end may be then delivered for piecing operation.
  • the second venturi jet (5b) may be placed at the farther end of the suction assembly.
  • a sensor (not shown) is placed inside the suction pipe (2) near the second venturi jet (5b) to detect the sucked broken yarn end. The sensor position provides an output upon detecting the broken yarn end in the suction pipe (2). Based on such output, the second venturi jet (5b) is provided with compressed air. Simultaneously, supply of the compressed air to the first venturi jet (5a) is cut off. Consequently, the broken yarn end is held inside the suction pipe (2) in a controlled manner without unwinding from the cop (4). The above sequence is continued whenever required.
  • Fig. 2 illustrates a perspective view of venturi jet (5).
  • the compressed air is passed inside the venturi jet (5) from an inlet.
  • the venturi jet (5) has tapered inner profile that purges the compressed air at an outlet of the venturi jet (5) at an upward direction of the cop (4) inside the suction pipe (2). This creates suction at the mouth (3) and the broken yarn end is picked upwards from the cop (4).
  • multiple / plurality of venturi jets can also be used.
  • a suction pressure due to the compressed air flow is varied at any sequence with a single or multiple flow controls. Timing of providing multiple flow controls may be varied in any sequence according to picking requirement of the broken yarn end. As a result, the suction pressure may desirably be maintained for efficient yarn picking and piecing.
  • a suction pressure for the first venturi jet (5a) is maintained in a suitable operating range, preferably 50 mbar to 70 mbar, until the broken yarn end is picked/sucked from the cop (4) and detected by the sensor positioned adjacent to second venturi jet (5b). Then, the second venturi jet (5b) is provided with compressed air. Simultaneously, the compressed air supply to first venturi jet (5a) is cut off.
  • a suction pressure for the second venturi jet (5b) is maintained in a suitable operating range, preferably the range of 30 mbar to 50 mbar, until the sucked broken yarn end is delivered for piecing.
  • a plurality of air jets may be provided around the bottom of the cop (4) to assist in lifting the broken yarn end (not shown).
  • a method for automatic piecing of broken yarns in a ring spinning machine comprises sucking a broken yarn end from a cop (4) using a suction assembly.
  • the suction assembly comprises a suction pipe (2) having a suction mouth (3) present at an end facing the cop (4).
  • the suction pipe (2) is positioned at a predetermined height over the cop (4).
  • a venturi jet (5a) isaffixed with the suction pipe (2), and the venture jet (5a) receives compressed air from a pressure supply port.
  • a movement of the compressed air through a constricted section of the said venturi jet (5a) creates vacuum in the suction mouth (3) to suck the broken yarn end from the cop (4) into the suction pipe (2).
  • the above described automatic piecing unit and a method for automatic piecing of broken yarns in a ring spinning machine provides a reliable solution for picking the broken yarn end from the cop without completely unwinding the cop (4) in a cost effective manner. Space is also considerably reduced in the automatic piecing unit (1) by eliminating use of heavy suction motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Claims (11)

  1. Automatische Anspinneinheit (1) zum Anspinnen von gebrochenen Fäden in einer Ringspinnmaschine, wobei die automatische Anspinneinheit (1) umfasst:
    eine Sauganordnung zum Saugen eines gebrochenen Fadenendes von einem Kops (4), wobei die Sauganordnung ein Saugrohr (2) mit einer Saugmündung (3) aufweist, die an einem dem Kops (4) zugewandten Ende positioniert werden kann, wobei das Saugrohr (2) in einer vorbestimmten Höhe über einem Kops (4) positioniert werden kann, um ein gebrochenes Fadenende von einem Kops (4) zu saugen; wobei
    eine erste Venturidüse (5a) mit dem Saugrohr (2) verbunden ist, um Druckluft von einem Druckversorgungsanschluss zu erhalten, wobei eine Bewegung der Druckluft durch einen verengten Abschnitt der ersten Venturidüse (5a) einen Unterdruck in der Saugmündung (3) erzeugt, um das gebrochene Fadenende von dem Kops (4) in das Saugrohr (2) zu saugen;
    dadurch gekennzeichnet, dass
    eine zweite Venturidüse (5b) an einem Ende des Saugrohrs (2) angeschlossen ist, die im Betrieb dazu bestimmt ist, entfernt von einem Kops (4) positioniert zu werden, wobei Druckluft für den Betrieb der zweiten Venturidüse (5b) auf der Grundlage eines Ausgangssignals eines Sensors bereitgestellt wird, der innerhalb des Saugrohrs (2) positioniert ist, und wobei der Sensor das Ausgangssignal beim Erfassen des Vorhandenseins des gebrochenen Fadenendes im Saugrohr (2) bereitstellt; und
    wobei die Zufuhr der Druckluft zu der ersten Venturidüse (5a) unterbrochen wird, wenn die zweite Venturidüse (5b) arbeitet.
  2. Automatische Anspinneinheit (1) nach Anspruch 1, wobei die Geschwindigkeit der Druckluft beim Durchgang durch den verengten Abschnitt der ersten Venturidüse (5a) zunimmt, was zu einem Unterdruck in der Saugmündung (3) führt.
  3. Automatische Anspinneinheit (1) nach Anspruch 1, wobei der Saugdruck für die erste Venturidüse (5a) in einem Betriebsbereich von 50 mbar bis 70 mbar gehalten wird, bis das gebrochene Fadenende aufgenommen ist.
  4. Automatische Anspinneinheit (1) nach Anspruch 1, wobei der Saugdruck für die zweite Venturidüse (5b) in einem Betriebsbereich von 30 mbar bis 50 mbar gehalten wird, bis der aufgenommene gebrochene Faden zum Anspinnen geliefert wird.
  5. Automatische Anspinneinheit (1) nach Anspruch 1, wobei die erste Venturidüse (5a) und die zweite Venturidüse (5b) mehrere Durchflusssteuerungen aufweisen.
  6. Automatische Anspinneinheit (1) nach Anspruch 5, wobei der Saugdruck für die erste Venturidüse (5a) und die zweite Venturidüse (5b) aufgrund des Druckluftstroms durch eine Durchflusssteuerung variiert wird.
  7. Automatische Anspinneinheit (1) nach Anspruch 5, wobei der Zeitpunkt der Bereitstellung der mehrfachen Durchflusssteuerungen entsprechend den Anspinnerfordernissen des gebrochenen Fadenendes variiert wird.
  8. Automatische Anspinneinheit (1) nach Anspruch 1, ferner umfassend mindestens eine Luftdüse, die am Boden eines Kops (4) positioniert werden kann, um das Saugen eines gebrochenen Fadenendes in das Saugrohr (2) zu unterstützen.
  9. Verfahren zum automatischen Anspinnen von gebrochenen Fäden in einer Ringspinnmaschine, wobei das Verfahren umfasst:
    Saugen eines gebrochenen Fadenendes von einem Kops (4) unter Verwendung einer Sauganordnung mit einem Saugrohr (2), das eine Saugmündung (3) aufweist, die an einem dem Kops (4) zugewandten Ende in einer vorbestimmten Höhe über dem Kops (4) angeordnet ist, einer ersten Venturidüse (5a), die mit dem Saugrohr (2) verbunden ist, die Druckluft von einem Druckversorgungsanschluss erhält, wobei eine Bewegung der Druckluft durch einen verengten Abschnitt der ersten Venturidüse (5a) einen Unterdruck in der Saugmündung (3) erzeugt, um das gebrochene Fadenende vom Kops (4) in das Saugrohr (2) zu saugen, dadurch gekennzeichnet, dass eine zweite Venturidüse (5b) an einem Ende des Saugrohrs (2) angeschlossen ist, die im Betrieb dazu bestimmt ist, entfernt von dem Kops (4) positioniert zu werden, wobei Druckluft für den Betrieb der zweiten Venturidüse (5b) auf der Grundlage eines Ausgangssignals eines Sensors bereitgestellt wird, der innerhalb des Saugrohrs (2) positioniert ist, und wobei der Sensor das Ausgangssignal beim Erfassen des Vorhandenseins des gebrochenen Fadenendes in dem Saugrohr (2) bereitstellt; und wobei die Zufuhr der Druckluft zu der ersten Venturidüse (5a) unterbrochen wird, wenn die zweite Venturidüse (5b) arbeitet.
  10. Verfahren zum automatischen Anspinnen nach Anspruch 9, wobei der Saugdruck für die erste Venturidüse (5a) in einem Betriebsbereich von 50 mbar bis 70 mbar gehalten wird, bis das gebrochene Fadenende aufgenommen ist.
  11. Verfahren zum automatischen Anspinnen nach Anspruch 9, wobei der Saugdruck für die zweite Venturidüse (5b) in einem Betriebsbereich von 30 mbar bis 50 mbar gehalten wird, bis der aufgenommene Fadenbruch zum Anspinnen abgegeben wird.
EP20172829.2A 2019-05-06 2020-05-05 Fadensauganordnung für eine anspinneinheit einer textilmaschine Active EP3736361B1 (de)

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CN113122976B (zh) * 2021-04-28 2023-03-31 日照品特裕华纺织科技有限公司 一种环锭纺纱机纱线搭接系统和方法及纱线的处理工具
CN114229610B (zh) * 2021-12-21 2022-09-30 长飞光纤光缆股份有限公司 一种光纤在线捕捉及牵引装置

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ES8205024A1 (es) * 1981-03-21 1982-05-16 Pons Ubach Antonia Aparato empalmador de hilos rotos en maquinas continuas de hilar
DE3726720A1 (de) * 1987-08-11 1989-02-23 Zinser Textilmaschinen Gmbh Verfahren und vorrichtung zum selbsttaetigen fadenansetzen an einer ringspinnmaschine
JP2018012902A (ja) * 2016-07-22 2018-01-25 村田機械株式会社 糸端捕捉装置
DE102017116302A1 (de) * 2017-07-19 2019-01-24 Maschinenfabrik Rieter Ag Verfahren zum Betreiben einer Arbeitsstelle einer Spinn- oder Spulmaschine
CZ201848A3 (cs) * 2018-01-31 2019-07-31 Rieter Cz S.R.O. Zařízení pro manipulaci s koncem příze na spřádacím místě prstencového spřádacího stroje, způsob manipulace s koncem příze a prstencový spřádací stroj
EP3708701A1 (de) * 2019-03-15 2020-09-16 Premier Evolvics PVT. Ltd. Vorrichtung, system und verfahren zur wiederherstellung nach fadenbruch in einer ringspinnmaschine

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EP3736361A1 (de) 2020-11-11
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