EP3736361B1 - Dispositif d'aspiration de fil pour unité de rattachement d'une machine textile - Google Patents

Dispositif d'aspiration de fil pour unité de rattachement d'une machine textile 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
European Patent Office
Prior art keywords
suction
venturi jet
cop
broken yarn
suction pipe
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EP20172829.2A
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German (de)
English (en)
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EP3736361A1 (fr
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. Unité de rattachement automatique (1) pour le rattachement de fils cassés dans une machine à filer à anneaux, l'unité de rattachement automatique (1) comprenant :
    un ensemble d'aspiration pour aspirer une extrémité de fil cassé provenant d'une cannette (4), ledit ensemble d'aspiration étant doté d'un tuyau d'aspiration (2) présentant une bouche d'aspiration (3) pouvant être positionnée au niveau d'une extrémité faisant face à une cannette (4), ledit tuyau d'aspiration (2) pouvant être positionné à une hauteur prédéterminée au-dessus d'une cannette (4), pour aspirer une extrémité de fil cassé provenant d'une cannette (4) ; dans lequel :
    un premier jet venturi (5a) est fixé avec le tuyau d'aspiration (2), pour recevoir de l'air comprimé à partir d'un orifice d'alimentation de pression, dans lequel le mouvement de l'air comprimé à travers une section resserrée du premier jet venturi (5a) crée un vide dans la bouche d'aspiration (3) pour aspirer l'extrémité de fil cassé provenant de la cannette (4) dans le tuyau d'aspiration (2) ; caractérisé en ce que
    un second jet venturi (5b) est connecté au niveau d'une extrémité du tuyau d'aspiration (2), laquelle, en fonctionnement, est censée être positionnée à distance d'une cannette (4), de l'air comprimé étant fourni pour le fonctionnement du second jet venturi (5b), en fonction d'un signal de sortie d'un capteur positionné à l'intérieur du tuyau d'aspiration (2), et le capteur fournissant le signal de sortie lorsqu'il détecte la présence de l'extrémité de fil cassé dans le tuyau d'aspiration (2) ; et
    dans lequel l'alimentation du premier jet venturi (5a) en air comprimé est coupée lorsque le second jet venturi (5b) fonctionne.
  2. Unité de rattachement automatique (1) selon la revendication 1, dans laquelle la vitesse de l'air comprimé augmente à son passage à travers la section resserrée dudit premier jet venturi (5a) qui entraîne le vide dans la bouche d'aspiration (3).
  3. Unité de rattachement automatique (1) selon la revendication 1, dans laquelle la pression d'aspiration du premier jet venturi (5a) est maintenue dans une plage de fonctionnement de 50 mbars à 70 mbars, jusqu'à ce que l'extrémité de fil cassé soit saisie.
  4. Unité de rattachement automatique (1) selon la revendication 1, dans laquelle la pression d'aspiration du second jet venturi (5b) est maintenue dans une plage de fonctionnement de 30 mbars à 50 mbars, jusqu'à ce que le fil cassé saisi soit délivré pour son rattachement.
  5. Unité de rattachement automatique (1) selon la revendication 1, dans laquelle ledit premier jet venturi (5a) et ledit second jet venturi (5b) présentent de multiples régulations de débit.
  6. Unité de rattachement automatique (1) selon la revendication 5, dans laquelle la pression d'aspiration du premier jet venturi (5a) et du second jet venturi (5b) due au débit d'air comprimé est modifiée par une régulation de débit.
  7. Unité de rattachement automatique (1) selon la revendication 5, dans laquelle la synchronisation de la fourniture des multiples régulations de débit est modifiée en fonction des exigences de saisie de l'extrémité de fil cassé.
  8. Unité de rattachement automatique (1) selon la revendication 1, comprenant en outre au moins un jet d'air pouvant être positionné au fond d'une cannette (4) pour faciliter l'aspiration d'une extrémité de fil cassé dans le tuyau d'aspiration (2).
  9. Procédé de rattachement automatique de fils cassés dans une machine à filer à anneaux, le procédé comprenant :
    l'aspiration d'une extrémité de fil cassé provenant d'une cannette (4) à l'aide d'un ensemble d'aspiration doté d'un tuyau d'aspiration (2) présentant une bouche d'aspiration (3) positionnée au niveau d'une extrémité faisant face à une cannette (4) à une hauteur prédéterminée au-dessus de la cannette (4), un premier jet venturi (5a) fixé avec le tuyau d'aspiration (2), qui reçoit de l'air comprimé à partir d'un orifice d'alimentation en pression, dans lequel le mouvement de l'air comprimé à travers une section resserrée dudit premier jet venturi (5a) crée un vide dans la bouche d'aspiration (3) pour aspirer l'extrémité de fil cassé provenant de la cannette (4) dans le tuyau d'aspiration (2), caractérisé en ce qu'un second jet venturi (5b) est connecté au niveau d'une extrémité du tuyau d'aspiration (2), qui, en fonctionnement, est censée être positionnée à distance de la cannette (4), dans lequel de l'air comprimé est fourni pour le fonctionnement du second jet venturi (5b), en fonction d'une sortie d'un capteur positionné dans le tuyau d'aspiration (2), et dans lequel le capteur fournit la sortie lorsqu'il détecte la présence de l'extrémité de fil cassé dans le tuyau d'aspiration (2) ; et dans lequel l'alimentation du premier jet venturi (5a) en air comprimé est coupée lorsque le second jet venturi (5b) fonctionne.
  10. Procédé de rattachement automatique selon la revendication 9, dans lequel la pression d'aspiration du premier jet venturi (5a) est maintenue dans une plage de fonctionnement de 50 mbars à 70 mbars, jusqu'à ce que l'extrémité de fil cassé soit saisie.
  11. Procédé de rattachement automatique selon la revendication 9, dans lequel la pression d'aspiration du second jet venturi (5b) est maintenue dans une plage de fonctionnement de 30 mbars à 50 mbars, jusqu'à ce que le fil cassé saisi soit délivré pour son rattachement.
EP20172829.2A 2019-05-06 2020-05-05 Dispositif d'aspiration de fil pour unité de rattachement d'une machine textile Active EP3736361B1 (fr)

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EP3736361B1 true EP3736361B1 (fr) 2022-03-09

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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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ES500590A0 (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
CZ307898B6 (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 (fr) * 2019-03-15 2020-09-16 Premier Evolvics PVT. Ltd. Dispositif, système et procédé de résurrection de cassure de fil dans une machine à filer à anneaux

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CN111893608B (zh) 2022-08-26
CN111893608A (zh) 2020-11-06
EP3736361A1 (fr) 2020-11-11

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