EP3121320B1 - Vorrichtung zur anpassung der spannung der florkettgarne in einer frotteewebmaschine - Google Patents

Vorrichtung zur anpassung der spannung der florkettgarne in einer frotteewebmaschine Download PDF

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Publication number
EP3121320B1
EP3121320B1 EP16180353.1A EP16180353A EP3121320B1 EP 3121320 B1 EP3121320 B1 EP 3121320B1 EP 16180353 A EP16180353 A EP 16180353A EP 3121320 B1 EP3121320 B1 EP 3121320B1
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EP
European Patent Office
Prior art keywords
pile
warp
warp yarns
tension
roll
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EP16180353.1A
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English (en)
French (fr)
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EP3121320A2 (de
EP3121320A3 (de
Inventor
Maurizio Belingheri
Italo Serturini
Adriano Zenoni
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Itema SpA
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Itema SpA
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/12—Controlling warp tension by means other than let-off mechanisms
    • D03D49/14—Compensating for tension differences during shedding
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D39/00—Pile-fabric looms
    • D03D39/22—Terry looms
    • D03D39/223—Cloth control
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/12—Controlling warp tension by means other than let-off mechanisms
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/22—Back rests; Lease rods; Brest beams

Definitions

  • the present invention belongs to the field of weaving looms for the production of terrycloth fabrics, also referred to, for brevity, as terrycloth looms.
  • the invention relates to a device for adjusting the tension of the pile warp yarns in a weaving loom for the production of terrycloth fabrics.
  • terrycloth fabric takes place by means of two series of warp yarns: usual warp yarns forming the base fabric of the terrycloth and, just for this reason, maintained constantly tight, and pile warp yarns, intended to precisely form a series of loops of thread - indicated in the field as "piles" - at least on one side and preferably on both sides of the fabric and having variable height with respect to the base fabric.
  • piles loops of thread
  • the unwrapping of the pile warp yarns is generally controlled by an adjustment system which adjust the unwrapping speed of the pile beam and the wrapping speed of the fabric, which adjustment system allows to adjust the tension of the pile warp yarns in a totally independent way from the tension of the base warp and in such a way to allow the regular forming of constant height piles.
  • the warp yarns going out from the pile beam pass through a pile warp roll assembly (in the field referred to as top pile warp roll assembly), along a path having a variable length according to the position taken by one of the rolls (referred to as "warp tensioner” or “warp tensioner roll”) with respect to the fixed position of the other rolls of the assembly, in order to compensate the increase of the path length imposed to the pile warp yarns during the steps of shed opening and of reed beating-up for forming the pile.
  • warp tensioner or “warp tensioner roll”
  • the movement of the warp tensioner roll is countered by suitable elastic means, which are adjusted in order to allow such movement when the tension of the pile warp yarns, due to the increase of the path length, exceeds a predetermined value.
  • This length compensation takes place then in an automatic and not controlled way and is therefore referred to as a "negative" compensation.
  • Terrycloth is obtained thanks to the fact that the reed, in addition to the usual first beating-up position against the fabric being woven, is also provided with a second backward beating-up position, set at a different distance with respect to the first one, which distance corresponds to twice the desired height of the pile.
  • this second backward operating position of the reed two successive wefts, in the most frequent case, are beaten-up and tied to the warp yarns and then, at the subsequent weft insertion, the reed resumes the normal beating-up position, thus dragging in this position also the two wefts already beaten-up in the backward position.
  • looms are divided into two categories, depending on the type of mechanical arrangement with which the aforesaid backward beating-up position of the reed is obtained.
  • a first loom category it is the same sley, i.e. the reed movement member, which is provided with a second backward beating-up position, obtained thanks to a modification of the relative control system.
  • the adjustment device of the present invention is comprised - the reed maintains its usual single beating-up position and some of the elements that take part to the weaving process - i.e.
  • both the base warp yarns and the pile warp yarns, the breast-beam, the warp guide roll of the base warp yarns and the fabric being woven - are shifted back and forth with a reciprocating and synchronized movement, in order to move away/approach the forming line of the fabric from/to the different beating-up position of the reed.
  • it is therefore determined a "normal" beating-up position and a "retracted” beating-up position of the reed if a reference system fixed to the fabric being woven is considered, despite the fact that the reed has a single and constant beating-up position with respect to a reference system fixed to the loom.
  • EP-1669483 discloses a loom for the production of terrycloth belonging to the second category described above, in which a warp tensioner roll of the top pile roll assembly is moved back and forth, in the direction of advancement of the fabric, by means of a lever mechanism controlled by an appropriate electric stepping motor, synchronously with the reciprocating motion of the base warps yarns and of the fabric being woven.
  • This latter movement is obtained, in a per se known manner, by providing the guide rolls deviating the base warp yarns and the fabric being woven with a controlled oscillating movement, by means of a system of levers and rods driven by the main motor of the loom.
  • the warp tensioner roll handling system not only to maintain a constant tension of the pile warp yarns during the alternating movement of the fabric and of the base warp yarns, but also to determine an additional loosening of the pile warp yarns in case of stop of the loom - in order to avoid that the newly formed piles, still unstable, are undone as a result of a tension increase caused by the repairing operations - such additional loosening being different depending on the type of stop (breakage of the weft, breakage of the warp, stopping for work interruption, etc.).
  • DE 1953022 discloses a weaving loom provided with a device for adjusting the pile warp yarn tension which comprises a negative adjustment to compensate for the shed opening/closing movement and a positive adjustment to compensate for the reciprocating traverse movement of said warp yarns.
  • the negative compensation is carried out by means of a conventional warp tensioner roll, movable in contrast to spring means, while the positive compensation is obtained by pivoting said warp tensioner roll in an eccentric manner on oscillating supports, connected to the alternating displacement linkage of the bottom warp yarns and of the fabric in formation.
  • EP 1422327 discloses a weaving loom provided with a device for adjusting the pile warp yarn tension, which comprises only a positive compensation carried out by means of a tensioning cylinder provided with a fixed contrast spring, as a base adjustment, and then operated by a variable torque electric motor to electronically adjust the tension of the pile warp yarns.
  • the object of the present invention is therefore that of providing a loom for the production of terrycloth according to the "movable breast-beam" mode of the second category described above, in which the compensation of the alternating movement of the pile warp yarns, made necessary by the movement of the breast-beam, is achieved in a positive way, and above all independently from the negative compensation of the shed opening and of the reed beating-up for forming the pile, so that the two types of compensation do not influence each other.
  • Another object of the invention is then to obtain said positive compensation using the same drive which alternately moves the base warp yarns, without the need to introduce a specific drive motor to this purpose, thus greatly reducing the cost of the loom, the quality of the produced fabric remaining unaltered.
  • the adjusting device of the invention achieves this by acting on the position of the warp tensioner roll by means of two mutually independent mechanical systems: a first system imparts a "positive" movement of the warp tensioner roll to compensate the alternating translation movement of the fabric and of the breast-beam; a second system allows, in the traditional way, a "negative" displacement of the warp tensioner roll, independent from the "positive” displacement thereof, to compensate the increase of path length of the pile warp yarns caused by the shed opening and the reed beating-up for forming the pile.
  • Fig. 1 The essential constitutive elements of a "movable breast-beam" terrycloth loom are shown in Fig. 1 .
  • this term indicates a particular category of looms for the production of terrycloth, in which the sley S alternately moves the reed P in a traditional way, namely with a single beating-up position, while the second beating-up position of the reed, necessary for forming the pile, is obtained by means of a forward motion, i.e. in the direction of the arrow K, of all the other elements that govern the formation of the fabric, i.e. the base warp yarns Wb, the pile warp yarns Wr, the fabric C and the breast-beam F.
  • This latter is not limited to the usual ratios of 3 wefts/1 pile or 4 wefts/1 pile, but includes all subsequent possible ratios up to N wefts/1 pile, while the amplitude of the translation movement may vary for each pile forming cycle, resulting in a theoretical height of the pile, variable from a zero value up to a maximum value corresponding to half the maximum possible translation amplitude of the warp yarns.
  • the alternating movement of the connecting rod L causes the movement of a lever 1, which, in turn, causes the corresponding rotation of a secondary lever 3, via a shaft 2 to which said levers are both fixed.
  • a rear tie rod 4 and a front tie rod 5 which control, via respective levers 6 and 7, the alternating movement in the direction of the arrow K and in the opposite direction of the following devices of the loom:
  • the adjustment device of the present invention aims to solve this problem, offering a positive compensation of the pile warp yarns in this very position, so as to keep the tension of the pile warp yarns perfectly constant, like that of the base warp yarns, during the alternating translation movement of the breast-beam.
  • the adjustment device of the invention proposes to obtain the positive compensation of the pile warp yarns in such a way as not to interfere with the usual negative compensation which is traditionally used to compensate the variations in the path length of the base warp yarns and of the pile warp yarns, due to the shed opening/closing and the reed beating-up for forming the pile.
  • the negative compensation mode of the warp yarns with particular reference to the pile warp yarns Wr, which compensation is carried out through an appropriate change of the geometric arrangement of the rolls in the top pile roll assembly G, during the shed opening and the reed beating-up for forming the pile.
  • warp guide roll assemblies having a negative compensation system apt to automatically change the position of the roll assembly and consequently the length of the path of the warp yarns, depending from the level of tension of the yarns themselves.
  • the top pile roll assembly G of the pile warp yarns comprises a first deviating roll 11 and a second deviating roll 12, both idly pivoted in fixed positions on the loom.
  • a warp tensioner 13 completes the assembly and it is supported on the first deviating roll 11, through a series of levers 15 which connect in an integral manner the deviating roll 11 with the warp tensioner 13, passing around the deviating roll 12 at an appropriate distance from the same so as to avoid any possible interference during the oscillations of the warp tensioner 13.
  • the warp tensioner 13 and a yarn-carrying bar 14 of small diameter integral with the same can rotate around the axis of the deviating roll 11, in response to the tension of the pile warp yarns Wr and to the contrast force of suitable adjustable elastic means 16 ( Fig. 2 ), which connect the deviating roll 11 to the warp tensioner 13 at their opposite ends.
  • suitable adjustable elastic means 16 Fig. 2
  • the arrangement of the pile warp yarns Wr in the top pile roll assembly G is the one illustrated in Figs. 4 , where it is possible to see that said yarns undergo a first forward deviation caused by the first deviating roll 11, a second backward deviation caused by the second deviating roll 12, and finally a last forward deviation caused by the warp tensioner 13 and relative yarn-carrying bar 14.
  • the adjustment of the elastic means 16 is set in function of the total load imparted by the pile warp yarns Wr, and therefore also of the total number of such yarns, so that in the conditions of shed closing the top pile roll assembly G is positioned as illustrated in fig. 4A .
  • the elastic means 16 are compressed and the warp tensioner 13 and relative integral yarn-carrying bar 14 can rotate around the axis of the deviating roll 11, until it reaches the final position shown in Fig. 4B .
  • a similar negative compensation device is of course provided in correspondence of the base warp guide roll 8.
  • the positive compensation device is moved by the same kinematic mechanism described above which determines the reciprocating motion of the breast-beam and that is driven by the motor M.
  • the movement imparted to the connecting rod L by the motor M is transferred in fact - by means of the lever 1, the shaft 2 and a short crank also integral to the shaft 2 - to a connecting rod 20 which causes the oscillation of a lever 21, having a slotted free end, with respect to the fixed fulcrum 22 of its opposite end (i.e. fulcrum 22 is hinged to the loom structure); the connection rod 20 and the lever 21 being joined together by a hinge 23.
  • Both the position of the fulcrum 22 and that of the hinge 23 are adjustable on different discrete positions to allow the adjustment of the extent of the compensation.
  • the slotted end of the lever 21 cooperates with a hinge-slide 24, apt to move inside the slot of the lever 21, and is pivoted to the end of a lever 25 integral with the warp tensioner 13, to cause the rotation of the same and of the yarn-carrying bar 14 which, as previously said, is fixed to the warp tensioner 13.
  • lever 20 makes lever 21 oscillate around the fulcrum 22, dragging in this sliding movement also the hinge-slide 24.
  • the linear movement transmitted to the end of the lever 25 causes the rotation of said lever and of the warp tensioner 13 around its own axis and therefore the forward displacement of the yarn-carrying bar 14.
  • This movement with an appropriate designing of the lever mechanism described above, causes a positive compensation on the pile warp yarns exactly corresponding to the displacement undergone by said yarns due to the movement, forth and back, of the breast-beam F and of the fabric guide roll 9, thus achieving the first object of the invention.
  • the arrangement of the slot end of the lever 21 is such as to be substantially parallel to the arc of the circle that the hinge-slide 24 performs during the negative compensation movement of the warp tensioner 13, i.e. during the rotation of the warp tensioner 13 around the axis of the first deviation roll 11.
  • the hinge-slide 24 may therefore freely slide and without any frictions inside the slot end of the lever 21 and, vice versa, when the lever 21 is operated by the positive compensation device, it will not be determined any rotation of the warp tensioner 13 around the first deviation roll 11, but just a rotation of the warp tensioner 13 around its own axis.
  • This arrangement therefore allows to clearly separate the positive and negative compensation of the top pile roll assembly G and the elastic means 16 are therefore not at all affected, or affected only in part, as will be said later, by the compensation of the variation of the path length of the pile warp yarns Wr caused by the alternating movement of the breast-beam F.
  • the lever 21 is provided with a series of holes that allow to move its pivoting point on the reference rod 20. By moving this pivoting point, it is possible to obtain a variation of the positive compensation run of the yarn-carrying bar 14 of the pile yarns.
  • the run of the reference rod 20 being equal, the more the pivoting point 23 is moved toward the fulcrum 22 the greater the rotation of the warp tensioner 13 and the displacement of the yarn-carrying bar 14 and, consequently, the positive compensation of the pile warp tensioner.

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

Claims (6)

  1. Vorrichtung zum Einstellen der Spannung der Florkettfäden in einer mobilen Brustbalken-Frotteewebmaschine, mit einer Florketten-Rollenanordnung (G), mit einer Kettspannerwalze (13), die mit einer negativen Kompensationsbewegung der Fachöffnung und des Blattanschlags für die Bildung des Flors und mit einer positiven Kompensationsbewegung der abwechselnden Verschiebung der Florkettfäden versehen ist, wobei die genannte positive Kompensationsbewegung der Kettspannerwalze (13) durch einen separaten Mechanismus, durch die gleiche Steuerung (M), die die abwechselnde Bewegung des Brustbalkens antreibt, betätigt wird, dadurch gekennzeichnet, dass der Mechanismus die Drehung der Kettspannerwalze (13) um ihre eigene Achse bewirkt und die positive Kompensationsbewegung durch eine garntragende Stange (14) vorgesehen ist, die mit der Kettspannerwalze (13) fest verbunden ist.
  2. Vorrichtung zum Einstellen der Spannung des Florkettenfäden gemäß Anspruch 1, wobei der Mechanismus eine Schlitzschlittenkupplung (21, 24) umfasst, welcher Mechanismus während der negativen Kompensation der Kettspannerwalze (13) inaktiv oder nur teilweise aktiv ist, und der während des Betriebs der positiven Kompensation der Kettspannerwalze (13) aktiv ist.
  3. Vorrichtung zum Einstellen der Spannung der Florkettenfäden gemäß Anspruch 2, wobei die Längsachse des Schlitzes im Wesentlichen parallel zu der negativen Kompensationsbewegung der Kettspannerwalze (13) ist.
  4. Vorrichtung zum Einstellen der Spannung der Florkettenfäden gemäß Anspruch 2, wobei die Längsachse des Schlitzes geeignet geneigt ist mit in Bezug auf die negative Kompensationsbewegung des Kettspanners (13), so dass während der negativen Kompensationsbewegung der Kettspannerwalze (13) die Garnträgerstange (14) zu einer Drehung um die Kettspannerwalze (13) veranlasst wird, um eine teilweise positive Kompensation bereitzustellen, auch während der Schritte der Fachöffnung und des Blattanschlags zum Bilden des Flors.
  5. Vorrichtung zum Einstellen der Spannung der Florkettfäden gemäß einem der Ansprüche 1 bis 4, wobei der Mechanismus umfasst:
    a. eine Verbindungsstange (20), die die Bewegung von der genannten Steuerung (M) erhält und die Schwingung eines ersten Hebels (21) verursacht, der ein freies geschlitztes Ende, bezogen auf den festen Drehpunkt (22) von seinem gegenüberliegenden Ende, das an der Webstuhlstruktur angelenkt ist, aufweist, wobei die Verbindungsstange (20) und der erste Hebel (21) durch ein Scharnier (23) miteinander verbunden sind;
    b. einen Scharnierschlitten (24), der geeignet ist, um sich innerhalb des geschlitzten freien Endes des ersten Hebels (21) zu bewegen und der an dem Ende eines zweiten Hebels (25) integral mit der Kettspannerwalze (13) schwenkbar angelenkt ist, um die Drehung derselben und der festen Garnträgerstange (14), die daran fixiert ist, zu veranlassen.
  6. Vorrichtung zum Einstellen der Spannung der Florkettfäden gemäß Anspruch 5, wobei die Position des festen Drehpunktes (22) des ersten Hebels (21) und die Position des Scharniers (23), das die Verbindungsstange (20) und den ersten Hebel (21) verbindet, auf verschiedene diskrete Positionen einstellbar ist, um die Anpassung des Ausmaßes der Kompensation zu ermöglichen.
EP16180353.1A 2015-07-21 2016-07-20 Vorrichtung zur anpassung der spannung der florkettgarne in einer frotteewebmaschine Active EP3121320B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2015A002354A ITUB20152354A1 (it) 2015-07-21 2015-07-21 Dispositivo di regolazione della tensione dei fili di ordito del riccio in un telaio per la tessitura di spugna

Publications (3)

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EP3121320A2 EP3121320A2 (de) 2017-01-25
EP3121320A3 EP3121320A3 (de) 2017-03-15
EP3121320B1 true EP3121320B1 (de) 2019-08-21

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EP (1) EP3121320B1 (de)
JP (1) JP6820679B2 (de)
CN (1) CN106400283B (de)
IT (1) ITUB20152354A1 (de)

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CN107675339A (zh) * 2017-11-14 2018-02-09 广东康特斯织造装备有限公司 积极式上送经结构

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Publication number Priority date Publication date Assignee Title
DE19530222C1 (de) * 1995-08-17 1996-06-05 Dornier Gmbh Lindauer Steuersystem für die Polkette zur Herstellung von Frottiergewebe auf Webmaschinen
DE19530333C2 (de) * 1995-08-17 1997-08-28 Univ Eberhard Karls Amplifikation von Pilzzellen-DNA sowie Verfahren zum Nachweisen von Pilzzellen in klinischem Material
DE10054851A1 (de) * 2000-05-12 2002-05-29 Dornier Gmbh Lindauer Frottierwebmaschine
JP2004169227A (ja) * 2002-11-21 2004-06-17 Tsudakoma Corp パイル織機の制御方法
CN2679184Y (zh) * 2003-12-31 2005-02-16 杭州纺织机械有限公司 毛巾织机上的动态张力调整装置
JP2006077340A (ja) * 2004-09-08 2006-03-23 Tsudakoma Corp 布移動式パイル織機におけるパイル形成方法およびその装置
JP4651082B2 (ja) 2004-12-10 2011-03-16 津田駒工業株式会社 パイル経糸張力の調整方法
JP4840735B2 (ja) * 2008-12-08 2011-12-21 株式会社豊田自動織機 パイル織機におけるパイル経糸張力調整装置

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Publication number Publication date
ITUB20152354A1 (it) 2017-01-21
EP3121320A2 (de) 2017-01-25
CN106400283B (zh) 2020-05-08
EP3121320A3 (de) 2017-03-15
JP2017061766A (ja) 2017-03-30
CN106400283A (zh) 2017-02-15
JP6820679B2 (ja) 2021-01-27

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