EP2058423A1 - Webmaschine, Garnzufuhrvorrichtung und Verfahren zum Einsatz eines gewobenen Garns - Google Patents

Webmaschine, Garnzufuhrvorrichtung und Verfahren zum Einsatz eines gewobenen Garns Download PDF

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Publication number
EP2058423A1
EP2058423A1 EP07019851A EP07019851A EP2058423A1 EP 2058423 A1 EP2058423 A1 EP 2058423A1 EP 07019851 A EP07019851 A EP 07019851A EP 07019851 A EP07019851 A EP 07019851A EP 2058423 A1 EP2058423 A1 EP 2058423A1
Authority
EP
European Patent Office
Prior art keywords
yarn
weft yarn
storage body
weft
control elements
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.)
Withdrawn
Application number
EP07019851A
Other languages
English (en)
French (fr)
Inventor
Fiorenzo Ghiardo
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.)
Iro AB
Original Assignee
Iro AB
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 Iro AB filed Critical Iro AB
Priority to EP07019851A priority Critical patent/EP2058423A1/de
Priority to US12/287,261 priority patent/US20090101228A1/en
Priority to CNA2008101673145A priority patent/CN101407966A/zh
Publication of EP2058423A1 publication Critical patent/EP2058423A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a weaving machine according to the preamble of claim 1, to a weft yarn feeder according to the preamble of claim 2, and to a method according to the preamble of claim 14.
  • US 5,778,943 A relates to a weft yarn feeder equipped with a controllable output brake for the weft yarn.
  • the output brake comprises a conical brush ring fixed to a housing bracket of the yarn feeder such that the bristles of the conical output brake cooperate with the rounded withdrawal rim of the storage body directly at the front end of the storage body.
  • the known yarn feeder does not work properly because the weft yarn may form entangled yarn loops between subsequent insertions in the region upstream from the entrance into the output brake.
  • US 3,411,548 A ( Figures 8 and 13) relates to a weft yarn feeder for a projectile weaving machine.
  • the stationary storage body has a conical withdrawal rim which directly continues from a cylindrical region of the storage body where the yarn store is stored intermediately for being taken off by the projectile.
  • a circumferentially closed brush ring is supported at the housing of the yarn feeder such that the ends of the inwardly projecting bristles contact the withdrawal rim in order to generate a desirable yarn tension during each insertion.
  • the brush ring is moved back and forth parallel to the axis of the storage body.
  • an end flange forms the front end of the stationary storage body.
  • the outer diameter of the end flange is larger than the diameter of the storage body in the region where the yarn store is stored intermediately.
  • the brush ring cooperates with the end flange. The brush ring can even be moved axially in relation to the withdrawal rim until the bristles are completely lifted from the withdrawal rim and do not impart any tensioning action on the weft yarn. In a heavy duty application, the weft yarn tends to get entangled around the front end of the storage body.
  • the weaving machine processes coarse yarn qualities with an extremly low quota of disturbances even in heavy duty applications when weaving fabric with considerable weaving width and extremely high weaving speed because the actively controlled yarn control elements, acting in addition to the passive balloon breaker on the region of the storage body between the yarn store and the withdrawal rim, assure that at the end of an insertion, and prior to the start of a subsequent insertion, the weft yarn is prevented from becoming entangled.
  • the mechanical influence of the yarn control elements, i.e. of at least one of the yarn control elements, on the withdrawn weft yarn reliably suppresses a balloon formation in the region of the yarn control elements and assures that after the insertion the weft yarn does not get slacky and that the front most windings in the yarn store do not lose their correct order.
  • the yarn control elements only impart the mechanical influence on the weft yarn beginning with the end phase of the insertion but are held in their rest position during the main part of the insertion.
  • the balloon suppressing effect of the yarn control elements then also assists the balloon suppressing effect of the passive balloon breaker to assure that the weft yarn follows an orderly path inside the balloon breaker during the end phase of the insertion and after the insertion of the weft yarn has stopped.
  • the yarn control elements are already brought into the rest positions such that the weft yarn takes an orderly, unobstructed course from the yarn store over the withdrawal rim into the balloon breaker.
  • the high acceleration of the weft yarn in the start phase of the subsequent insertion is not at all negatively influenced by the yarn control elements.
  • Controlling the weft yarn beginning with the end phase of the insertion by the yarn control elements reliably prevents the weft yarn from becoming entangled. This avoids operation disturbances and undesirable fabric faults even in the case of very coarse yarn qualities such as band-shaped yarns made from polypropylene.
  • the temporary engagement of the actively controlled yarn control elements beginning with the end phase of insertion is of assistance for the balloon suppressing effect of the passive balloon breaker and assures that no critical entanglements occur neither when an insertion is terminated nor before the subsequent insertion is started.
  • the interaction between the actively controlled yarn control elements and the withdrawn weft yarn is only limited and begins at the end phase of an insertion, while during the main part of the insertion, the weft yarn can be withdrawn without disturbance by the yarn control elements with full speed and high acceleration.
  • the yarn control elements are controlled such that they add an additional balloon suppressing action to the given balloon suppressing action of the passive balloon braking when the weft yarn is decelerated and finally brought to a stop because then the passive balloon breaker cannot generate any influence on the weft yarn in the region between the yarn store on the storage body and the withdrawal rim.
  • the engagement of the yarn control elements first starts in the end phase of the insertion and is actively terminated shortly before the start of the subsequent insertion.
  • the engagement must, in any case, not stop the weft yarn but has to create a mechanical obstacle only which prevents the weft yarn section between the yarn store and the withdrawal rim from becoming slack and avoids that the front most windings in the yarn store lose their orderly placements on the storage body and inadvertently travel further forward while the weft yarn is decelerated abruptly.
  • the yarn control elements are distributed regularly in circumferential direction in a common plane which is perpendicular to the axis of the storage body. This arrangement assures that with certainty at least one of the yarn control elements, or preferably several of the yarn control elements, will mechanically engage on the weft yarn.
  • two to four yarn control elements may be provided such that the intermediate distance between adjacent yarn control elements is larger in circumferential direction than the circumferential dimension of each yarn control element.
  • the yarn control elements are aligned with a region of the storage body upstream from the withdrawal rim, which region defines the maximum diameter of the storage body and which extends continuously in circumferential direction.
  • this region has a larger diameter than another region of the storage body provided for carrying the yarn store.
  • the circumferentially continuous region of the storage body provides a smooth and continuous guiding and supporting surface for the rotating weft yarn.
  • each yarn control element is a pin which is movable substantially radially with respect to the axis of the storage body.
  • the free end of the pin forms a gap with the storage body in the operative position which gap is wider than the yarn thickness. Due to centrifugal force tending to lift the weft yarn from the storage body in the end phase of the insertion, the weft yarn then comes into mechanical engagement with at least one of the yarn control elements.
  • the yarn control element is driven by a linear drive such as a pneumatic cylinder or a solenoid.
  • the drive may only fulfill a stroke of the yarn control element in one direction against the force of a spring which acts the opposite direction.
  • the linear drive could actively control the yarn control elements in both moving directions.
  • the yarn control elements and a common drive for all yarn control elements or separate drives are arranged in a ring body surrounding a front end of the storage body with radial distance.
  • the ring body not only serves as the carrier for the yarn control elements and the drive or the drives but also fulfills a supplemental balloon suppressing function during the insertion.
  • the part of the yarn control element which engages in the operative position at the weft yarn is either rigid in circumferential direction or is flexible. If the part is rigid, the part has to keep a certain distance from the storage body in the operative position of the yarn control element. If the part is flexible, the part even may contact the storage body in the operative position of the yarn control element because then this part will yield when the weft yarn is passing beneath.
  • the ring body is arranged such in a housing bracket of the weft yarn feeder that the ring body can be adjusted in the direction of the axis of the storage body.
  • the housing bracket comprises a linear adjustment mechanism for the ring body allowing the ring body to be optimally placed in relation to the storage body and/or the withdrawal rim.
  • the passive balloon breaker is removeably arranged at the ring body. As such, the ring body fulfills several tasks.
  • the yarn control element is either designed as a brush having bristles, or fingers pointing towards the storage body, or carrying a foam material layer or a felt layer.
  • the bristles may be oriented either substantially radially with respect to the axis of the storage body or may be inclined in the direction in which the weft yarn is rotating during withdrawal.
  • the yarn control element may be a leaf spring.
  • the leaf spring can be bent in the direction which the weft yarn is rotating during withdrawal.
  • the drive for adjusting the leaf spring between the rest position and the operative position may be either a radial linear drive or a pivot drive for pivoting the leaf spring.
  • the yarn control element may be designed as a pivot arm or a pivotable brush having fingers or bristles oriented towards the storage body.
  • the drive may be a pivot drive like a pneumatic piston, a solenoid or an electric step motor.
  • the yarn control elements are brought into the operative position first beginning with the end phase of the insertion, i.e. as soon as or before the withdrawn weft yarn is decelerated abruptly.
  • the yarn control elements then mechanically engage on the weft yarn until the weft yarn comes to a stop caused by the stoppage of the insertion element, i.e. the projectile.
  • the yarn control elements should mechanically engage at the weft yarn for the last about 30° to 70° of the insertion and only up to 5° to 10° ahead of the start of the subsequent insertion. During the main period of the insertion, the yarn control elements then will be held in the rest positions where they do not impart any mechanical influence on the weft yarn.
  • a weaving machine W comprises a weaving shed 1 having a reed 1 a driven by a main shaft 2 of the weaving machine.
  • One of a plurality of projectiles 3 serves as an insertion element E for inserting a weft yarn Y into the weaving shed 1.
  • the weft yarn Y is intermediately stored in a yarn store 7 on a stationary storage body 6 of a weft yarn feeder F which takes off the weft yarn Y from a storage bobbin B.
  • the weft yarn feeder F has a housing 4 and a winding-on-element 5 which can be driven for rotation by a motor 16 in relation to the stationary storage body 6 which might have substantially the form of a drum.
  • a housing bracket 9 supports a hollow passive balloon breaker 8 (e.g. a balloon breaker cone) aligned with the storage body 6 such that the withdrawn weft yarn Y has to pass through the passive balloon breaker 8. Furthermore, several yarn control elements 11 are provided which can be actively driven by either a common or by separate drives 10 as it will be explained in more detail with respect to Figures 2 , 3 and 4 .
  • a hollow passive balloon breaker 8 e.g. a balloon breaker cone
  • the weaving machine W is a weaving machine for heavy duty applications.
  • the weft yarn feeder F is also prepared (e.g. anti-abrasive coating on the storage body, powerful motor, robust sensor, etc.) for heavy duty applications meaning for a relatively coarse and/or stiff weft yarn Y, e.g. a weft yarn such as a band of synthetic material like polypropylene.
  • the weaving machine W could be a rapier weaving machine with drivable rapiers as insertion elements E.
  • the weft yarn feeder F in Figure 2 comprises in the housing 4, the drive motor 16 in the housing 4 for driving a main shaft 15 which in the right side section of Figure 2 is hollow and carries the winding-on element 5.
  • the stationary storage body 6 is substantially conventional and is supported on the main shaft 15.
  • the storage body 6 has a circumferential and axial region 12 intended for carrying the yarn store 7 (not shown in Figure 2 ).
  • This region 12 might consist of spaced apart axial rods between which conventional advance elements operate in order to transport the windings in the yarn store 7 forward and to separate the windings from each other.
  • a sensor device 17 is arranged partly in the storage body 6 and at the lower side of the housing bracket 9. The sensor device 17, e.g. serves to control the drive motor 16.
  • the region 12 is substantially cylindrical and is continued by another cylindrical circumferentially continuous region 13 which in the shown embodiment defines the largest diameter of the storage body 6.
  • a withdrawal rim 14 is provided with a diameter which decreases in withdrawal direction, i.e. is conically tapered or is rounded convexly.
  • the front end of the storage body 6 is surrounded by a ring body 18 which is supported via a slider 19 in the housing bracket 9.
  • adjustment mechanism 20 allows the position of the ring body 18 to be adjusted parallel to the axis of the storage body 6.
  • the passive hollow balloon breaker 8 is removably fixed by the big diameter end to the ring body 18.
  • the passive balloon breaker 8 could be fixed to the housing 4, or the housing bracket 9, or to another not shown support.
  • the ring body 18 forms a circumferential continuous gap around the region 13.
  • the gap width is, e.g. a multiple of the thickness of the weft yarn Y which is to be processed.
  • the ring body 18 here even extends in axial direction beyond the front end of the storage body 6.
  • a plurality of actively controlled yarn control elements 11, e.g. arranged at the ring body 18, is distributed with circumferential intermediate distances, preferably regularly, around the front end of the storage body 6.
  • Examples of the number of yarn control elements 11 are two, three or four. The number, however, could even be larger than four.
  • the yarn control elements in Figures 2 and 3 are oriented radially to the axis of the storage body 6 and can be actively driven in a radial direction between an operative position ( Figure 2 , P2) and a rest position ( Figure 3 , P1) by a common drive or by separate linear drives such as pneumatic cylinders, solenoids, or electric linear motors, etc. represented by the indicated drive 10 supported on the ring body 18.
  • the yarn control element is a rigid pin 22.
  • the free end of the pin 22 maintains a predetermined distance from the region 13 of the storage body 6 so that a gap x is kept open with a width a slightly larger than the thickness of the weft yarn Y processed by the weft yarn feeder F and the weaving machine W.
  • the pin 22 could instead be flexible in circumferential direction and also axial direction of the storage body 6. In this case, it is possible that the pin 22 even slightly contacts the region 13 of the storage body 6 in the operative position P2.
  • Figure 2 shows that the ring body 18 has a smooth, substantially cylindrical inner surface 21 such that the ring body 18 also fulfills a balloon suppressing function for the withdrawn weft yarn Y.
  • the yarn control element 11 is moved outwardly so that the free end is either substantially flush with the cylindrical surface 21 or is even set back to a small extent.
  • the respective drive 10 is controlled in relation to the weaving cycle of the weaving machine 2 such that the yarn control elements 11 are brought into the operative positions P2 first in the end phase of a insertion and before the weft yarn is stopped by a stoppage of the projectile 3, are then kept in the operative positions to a point in time shortly before the start of the subsequent insertion and are then moved into the rest positions P1 before the subsequent insertion starts and are finally kept in the rest positions P1 over the major part of the insertion.
  • Figure 4 illustrates the ring body 18 serving at the carrier for the drives 10, which in this case are linear drives 23, and receiving the yarn control elements 11.
  • the drives 10 which in this case are linear drives 23, and receiving the yarn control elements 11.
  • the ring body 18 carries the slider 19 and e.g. is prepared with fastening holes 24 for removeably fixing the passive hollow balloon breaker 8.
  • Figure 10 illustrates one insertion P within a rotation of 360° of the main shaft 2 of the weaving machine W.
  • the insertions e.g. starts at 150° and is terminated at 340°.
  • the remaining angular range within the 360° revolution of the main shaft 2 is used for cutting the weft yarn, for beating up the inserted weft yarn by the weaving reed, for carrying out the shed change, for transmitting the weft yarn to a projectile 3 and e.g. also for selecting the respective weft yarn.
  • Some degrees prior to the start of the insertion P e.g. at 145°, the yarn control elements 11 are actively moved from the operating positions P2 into the rest positions P1 and are then kept in the rest positions P1 up to , e.g.
  • the yarn control elements 11 are again actively moved into the operative position P2 so that the yarn control elements 11 remain in the operative positions P2 for the last about 30° to about 70° of the insertion P.
  • the yarn control elements 11 are further kept in the operative positions P2 up to again about 145° before the subsequent insertion P or are actively moved into the rest positions P1 some mili-seconds prior to the start of the subsequent insertion P.
  • the yarn control element 11 in the embodiment of Figure 5 is a brush 25 having bristles or fingers 26 oriented toward the region 13 of the storage body 6.
  • Figure 5 illustrates the rest position.
  • the drive 10 is a linear drive 23, e.g. a pneumatic cylinder with a piston 23' acting, e.g. against a return spring 29.
  • the bristles or fingers 26, which are flexible, are oriented substantially radially with respect to the axis of the storage body.
  • Figure 6 illustrates a similar embodiment in which the brush 25 has flexible bristles or fingers 26 which are inclined in relation to a radial orientation in the rotating direction 27 of the withdrawn weft yarn.
  • a layer of felt or foam material 26 could be provided on the brush 25.
  • the yarn control element 11 is a leaf spring 28 which is either curved or straight and is inclined in the direction 27 of rotation of the withdrawn weft yarn.
  • the drive 10 is a linear drive 23, e.g. a solenoid which is adapted to move the yarn control element 11 in both directions between the rest position and the operative position. In the operative position as shown in Figure 7 , there might be a small gap between the free end of the leaf spring 28 and the region 13. Alternatively, the leaf spring 28 may even contact the region 13.
  • the yarn control element 11 is a rigid or flexible pivot arm 30 fixed to a pivot axis 31.
  • the drive 10 is a pivot drive 32 like a rotary solenoid, a pneumatic piston, a step motor, or the like.
  • the pivot arm 13 At least in the operative position, the pivot arm 13 might be inclined in the direction 27 of the rotation of the withdrawn weft yarn.
  • leaf spring 28 of Figure 7 could instead be moved by a pivot drive 32 between both positions.
  • the yarn control element 11 is a pivotably supported small brush 33 having several flexible bristles 34.
  • the bristles 34 can be pivoted by a pivot drive 32, e.g. into contact with the region 13 of the storage body 6.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP07019851A 2007-10-10 2007-10-10 Webmaschine, Garnzufuhrvorrichtung und Verfahren zum Einsatz eines gewobenen Garns Withdrawn EP2058423A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07019851A EP2058423A1 (de) 2007-10-10 2007-10-10 Webmaschine, Garnzufuhrvorrichtung und Verfahren zum Einsatz eines gewobenen Garns
US12/287,261 US20090101228A1 (en) 2007-10-10 2008-10-07 Weaving machine, yarn feeder and method for inserting a weft yarn
CNA2008101673145A CN101407966A (zh) 2007-10-10 2008-10-10 纺织机、喂纱器以及喂纱的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07019851A EP2058423A1 (de) 2007-10-10 2007-10-10 Webmaschine, Garnzufuhrvorrichtung und Verfahren zum Einsatz eines gewobenen Garns

Publications (1)

Publication Number Publication Date
EP2058423A1 true EP2058423A1 (de) 2009-05-13

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EP07019851A Withdrawn EP2058423A1 (de) 2007-10-10 2007-10-10 Webmaschine, Garnzufuhrvorrichtung und Verfahren zum Einsatz eines gewobenen Garns

Country Status (3)

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US (1) US20090101228A1 (de)
EP (1) EP2058423A1 (de)
CN (1) CN101407966A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2169099A1 (de) * 2008-09-25 2010-03-31 L.G.L. Electronics S.p.A. Negativer Garnzuführer mit Schussfadenbremsvorrichtung
BE1025536B1 (nl) * 2017-09-07 2019-04-08 Picanol N.V. Draadreminrichting voor een inslagtoevoerinrichting

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411548A (en) 1965-06-25 1968-11-19 Sulzer Ag Weft thread supply apparatus for gripper shuttle looms
US5343899A (en) 1990-03-12 1994-09-06 Iro Ab Output yarn brake
US5769132A (en) 1993-09-15 1998-06-23 Iro Ab Projectile or gripper shuttle loom with anti-ballooning cone for weft feeder
US5778943A (en) 1994-01-26 1998-07-14 Iro Ab Controllable output brake, thread feed device as well as projectile or gripper weaving machine
EP1149793A2 (de) * 2000-04-28 2001-10-31 L.G.L. Electronics S.p.A. Ballonbegrenzer für eine Schussfadenlierfervorrichtung in Webmaschinen insbesondere Lüftdüsenwebmaschinen

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SE8207096D0 (sv) * 1982-12-10 1982-12-10 Iro Ab System for temporer upplagring och matning av uppmetta garnlengder foretredesvis till dysvevmaskiner
US4627474A (en) * 1982-09-03 1986-12-09 Aktiebolaget Iro Yarn storing, feeding and measuring device
SE8207098D0 (sv) * 1982-12-10 1982-12-10 Iro Ab Anordning for temporer upplagring och matning av uppmetta garnlengder, foretredesvis till dysvevmaskiner
IT1176259B (it) * 1984-06-04 1987-08-18 Roy Electrotex Spa Alimentatore di trama per telai di tessitura
US4768565A (en) * 1984-09-27 1988-09-06 Aktiebolaget Iro Method for controlling a yarn storing, feeding and measuring device
IT1184759B (it) * 1985-04-22 1987-10-28 Roy Electrotex Spa Porgitrama per telai di tessitura
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IT1224443B (it) * 1987-12-31 1990-10-04 Roy Electrotex Spa Tastatrama a regolazione automatica del tempo di ritardo per porgitrama di telai senza navetta
IT1217339B (it) * 1988-02-11 1990-03-22 Roy Electrotex Spa Alimentatore di filo per macchine tessili
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DE3911411A1 (de) * 1989-04-07 1990-10-11 Iro Ab Elektronisch gesteuertes schussfaden-verarbeitungs-aggregat
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DE4324160A1 (de) * 1993-07-19 1995-01-26 Iro Ab Eintragsystem für eine Düsenwebmaschine
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DE19706288A1 (de) * 1997-02-18 1998-08-20 Iro Ab Meßliefergerät

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411548A (en) 1965-06-25 1968-11-19 Sulzer Ag Weft thread supply apparatus for gripper shuttle looms
US5343899A (en) 1990-03-12 1994-09-06 Iro Ab Output yarn brake
US5769132A (en) 1993-09-15 1998-06-23 Iro Ab Projectile or gripper shuttle loom with anti-ballooning cone for weft feeder
US5778943A (en) 1994-01-26 1998-07-14 Iro Ab Controllable output brake, thread feed device as well as projectile or gripper weaving machine
EP1149793A2 (de) * 2000-04-28 2001-10-31 L.G.L. Electronics S.p.A. Ballonbegrenzer für eine Schussfadenlierfervorrichtung in Webmaschinen insbesondere Lüftdüsenwebmaschinen

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Publication number Publication date
CN101407966A (zh) 2009-04-15
US20090101228A1 (en) 2009-04-23

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