EP3098338B1 - Webblatt für luftdüsenwebmaschinen - Google Patents

Webblatt für luftdüsenwebmaschinen Download PDF

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Publication number
EP3098338B1
EP3098338B1 EP16169465.8A EP16169465A EP3098338B1 EP 3098338 B1 EP3098338 B1 EP 3098338B1 EP 16169465 A EP16169465 A EP 16169465A EP 3098338 B1 EP3098338 B1 EP 3098338B1
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Prior art keywords
dent
reed
wall
central recess
arcuate connecting
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English (en)
French (fr)
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EP3098338A2 (de
EP3098338A3 (de
Inventor
Fabio Rabolini
Giancarlo PREVITALI
Fabrizio MORANDI
Bruno BRIGNOLI
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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
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • D03D47/278—Guide mechanisms for pneumatic looms
    • 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
    • D03D49/60—Construction or operation of slay

Definitions

  • the present invention relates to a reed for air weaving looms and, in particular, a reed of this kind which allows to reduce the consumption of compressed air which is necessary for the transport of the weft threads through the shed.
  • the weft thread is inserted in the shed without the aid of mechanical elements, but simply conveying the weft thread along the shed by means of gas (normally compressed air) jets.
  • gas normally compressed air
  • the generation of air jets includes a system of main nozzles, normally placed on the left side of the machine, which provide initial acceleration to the weft thread, and a system of secondary nozzles, evenly distributed along the shed, necessary to maintain an appropriate speed of the weft through the shed length.
  • a launching channel is formed inside of the reed, by providing a recess of suitable shape in an enlarged central area of the single reed dents, delimited by upper and lower rounded portions or "noses" of the dent.
  • Reed dents are in fact arranged at a short distance from each other on perfectly parallel planes, perpendicular to the direction of insertion of the weft thread; side-by-side recesses of the plurality of parallel dents which form a reed therefore define a launching channel, inside which the weft thread moves.
  • the launching channel formed in the reed is in fact an outwardly "open" channel both in correspondence with the gaps between the individual dents and, above all, in the direction facing towards the fabric being woven, and it is therefore clear that a significant portion of the compressed air jets used to achieve the transport of the weft thread is dispersed through the reed or in front of it without contributing to the transport of the weft, thus decreasing the efficiency of use of compressed air.
  • EP 0 691 430 discloses several embodiments of a reed for air looms in which the recess formed in the dents has a U shape with rounded edges, the lower side of which is inclined towards the secondary nozzles to facilitate air going in and channelling into the launching channel. According to a main feature of this patent ( Fig.
  • the connecting radius (r) of the upper inner angle of the U-shaped recess, - which inner angle is just the area in which the weft thread moves along the launching channel - has a smaller dimension than the connecting radius (R) of the lower angle of the U-shaped recess opposite thereto, and in absolute value it is a very small radius, smaller than 1 mm and preferably smaller than 0.5 mm.
  • a second important feature of this reed is that according to which the projecting portions of each dent which delimit the upper and lower U-shaped recess, simply defined in the textile jargon as "noses", do not have a symmetrical configuration; in particular, the width of the lower nose (in the direction of the warp threads) is smaller than that of the upper nose, so as to allow a closer approach of the secondary nozzles to the reed and to improve the efficiency of use of compressed air.
  • the width W3 of the lower nose is about 75% of the width W1 of the upper nose, both of said widths being measured with respect to the bottom wall 342 of the central U-shaped recess.
  • Fig. 1 the width W3 of the lower nose is about 75% of the width W1 of the upper nose, both of said widths being measured with respect to the bottom wall 342 of the central U-shaped recess.
  • the width W13 of the lower nose is even more reduced and is comprised in a range between about 25 and 55% of width W11 of the upper nose; also in this embodiment said widths are measured with respect to the bottom wall 842 of the central U-shaped recess.
  • a third feature disclosed by this patent is the one according to which the various walls delimiting the U-shaped recess have a moderate inclination of about 10° in the weft advancement direction, thus transversely to the plane of the dents, in order to divert the air jet towards the inside of the weft launching channel, at each single dent, and thus reduce the leakage of compressed air through the individual dents of the reed.
  • EP 2 455 520 (Toyota) afterwards discloses again the same second embodiment of the above cited Toyota patent, wherein some dimensional limits are however specified ( Fig. 3 ) - which limits will be discussed below in greater detail - defining a preferred configuration of the lower wall of the U-shaped recess of the dents.
  • the inventors started from the current state of the art, according to which - as already discussed in the introductory part of the present description - the consumption of compressed air to transport the weft inside the reed channel decreases with the decrease of the distance of the secondary nozzles from the weft.
  • the distance to be considered is that between the blow point 18 of the secondary nozzles 17 and the bottom wall 22 of the U-shaped central recess of the dent.
  • the weft moves along the launching channel in proximity of said bottom wall 22, and more precisely of the upper end of the same.
  • blow point 18 must be maintained external to the U-shaped central recess and at a certain minimum distance from the reed, so that secondary nozzles 17 do not give rise to defects in the weft or warp threads.
  • the transverse dimension of the lower nose 20 of the reed dents is significantly reduced.
  • the length B of lower nose 20 protrusion, in relation to the bottom wall 22 of the U-shaped central recess, is significantly lower than the corresponding length A of the upper nose 19 protrusion of the dent.
  • the shape of the wall 23 of the dent i.e. the lower wall of the U-shaped central recess, must be such that the sum of radiuses CR and DR of the arcuate connecting surfaces 25 and 29 which delimit it is less than the distance B, preferably by more than 1.5 mm.
  • a flat portion ⁇ is formed on the lower wall 23 of the dent, comprised between the arcuate connecting surfaces 25 and 29, the presence of which, as reported in the above cited patent, prevents effectively air flow coming from secondary nozzles from being diffused outside the launching channel and then stabilizes the weft along the desired path position, considerably reducing the number of incorrect wefts.
  • the Applicant has then assumed to provide a completely different shape of the lower wall of the central recess of the dents, abandoning the traditional shape according to which arcuate connecting surfaces tangent to the straight portions of the walls delimiting the central recess have always been provided, and suggesting instead for the outer arcuate connecting surface of the lower nose of the dents (namely the one indicated with reference 29 in the prior art illustrated in Fig. 3 ) a curved profile tangent to the flat portion ⁇ , at one end, and forming a corner with the outer wall of the dent, at the other end.
  • the new dent configuration according to the present invention is illustrated in Fig. 4 and includes respectively lower and upper internal arcuate connecting surfaces R2 and R3, having a known shape, i.e. being tangent at each end thereof to the adjacent flat walls of the central recess C of the dent that they connect.
  • the lower arcuate connecting surface R2 is tangent to the lower wall L2 and to the bottom wall L3
  • the upper arcuate connecting surface R3 is tangent to the lower wall L3 and to the upper wall L4.
  • the arcuate connecting surfaces R2 and R3 are in the shape of circular arcs, respectively of radius r2 and r3 having a small value, for example greater than or equal to 1 mm; preferably, the radius r3 of the upper arcuate connecting surface R3, which delimits the area of most likely weft path, has a slightly higher value than radius r2 of the lower arcuate connection surface R2.
  • the arcuate connecting surface R1 which connects the lower wall L2 of the central recess C of the dent to the lower outer wall L1 of the same dent also has a circular arc profile having, however, a radius r1 clearly greater than radiuses r2 and r3 defined above.
  • the radius r1 of the arcuate connecting surface R1 has a value so high that the following relationship is always satisfied: r 1 + r 2 > B .
  • the r1 radius of such arcuate connecting surface is tangent only to the inner wall L2 of the central recess (C) of the dent, but not to the outer wall L1 of the dent, forming an angle different from 0° and thus an edge with respect to the latter. Due to limitations imposed by the construction technology of the dents, this edge may have a radius which, however, for obtaining the best performances, should be kept at the minimum possible value.
  • the lower wall L2 of the central recess C of the dent is diverging with respect to the opposed upper wall L4, according to the geometry already taught in the prior art, with the aim of facilitating the entry of the air flow coming from the secondary nozzles for improving the weft transport within the launching channel.
  • best results were obtained in terms of air consumption efficiency for the transport of the weft, forming said two divergent walls L2 and L4 according to a slightly wider angle than the known one and specifically an angle between 12° and 14°.
  • the above described shape of the lower wall L2 of the central recess C of the dent and relative arcuate connecting surface R1, according to the present invention, allows to obtain some important advantages. Firstly, by using a relatively large radius value r1 for the arcuate connecting surface R1, the degree of curvature of such a surface is very low, and then the first portion thereof, tangent to the straight lower wall L2, substantially causes the same effect of an extended straight lower wall L2, in terms of weft stabilization inside the launching channel, which weft stabilisation is therefore greatly improved.
  • the critical value of the length of the straight lower wall L2 pointed out by the prior art does not exist anymore and the length of said lower wall L2 can also drop below said critical value, without experiencing any adverse effect on weft stabilisation, as long as the radius r1 has sufficiently high values.
  • the straight lower wall L2 can also be completely eliminated, then going to directly connect the arcuate connecting surface R1 with the arcuate connecting surface R2.
  • the tangent to these curved surfaces, at their joining point, which is in this case a flex point, will of course preferably meet the conditions of inclination with respect to the upper wall L4, already previously defined in relation to the straight lower wall L2.
  • a second desired advantage of this shape consist in the resuiting reduction of the width B of the protrusion of the bottom portion of the dent with respect to the bottom wall L3 of the central recess C.
  • the value of this width B of the dent according to the present invention is in fact significantly smaller than the width B' of a dent in which the arcuate connecting surface R1 is extended over a wider circular arc until it can join the lower outer wall L1' of the dent, by being tangent thereto.
  • the dent shape according to the present invention achieves the desired object of decreasing the width B, and therefore also the objects of making the secondary nozzles closer to the weft traveling area and of reducing accordingly the air flow needed to keep flying the weft itself.
  • a third advantage of the dent shape according to the present invention is to decrease the width of the opening mouth of the central recess C of the dent, from width K' to width K ( Fig. 5 ), width K' being just the opening mout width of a dent in which the arcuate connecting surface R1 covers a wider circular arc, until it joins the lower external wall L1' (shown in dashed lines) of the dent, by being tangent thereto.
  • the reduction from K' to K of the width of the opening mouth of the central recess C of the dent is also obtained by excluding the terminal portion of arcuate connecting surface R1, namely the one that would show a nearly vertical slope.
  • the width reduction of the opening mouth of the central recess C of the dent - which coincides with the opening mouth of the launching channel - does not therefore causes, on the one hand, a significant reduction of input air flow in said launching channel while, on the other hand, it reduces the interference of the lower nose of the tooth with the warp threads during opening and closing steps of the shed, thus entailing a reduction of possible defects in the woven fabric.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Air Bags (AREA)

Claims (5)

  1. Webblatt für Luftdüsenwebmaschinen, das eine Mehrzahl von nebeneinander liegenden Vertiefungen umfasst, wobei jede Vertiefung mit einer breiten zentralen Aussparung (C) vorgesehen ist, welche einen oberen Abschnitt von einem unteren Abschnitt der Vertiefung trennt, um den Webblattausstoßkanal zu bilden, wobei die zentrale Aussparung (C) zumindest durch eine untere Wand (L2), eine Bodenwand (L3), eine obere Wand (L4), zwei innere, gekrümmte, bogenförmige Verbindungsflächen (R2, R3), welche die Wände miteinander verbinden, und eine äußere, bogenförmige Verbindungsfläche (R1), welche die untere Wand (L2) mit der äußeren Wand (L1) des unteren Abschnitts der Vertiefung verbindet, begrenzt ist,
    dadurch gekennzeichnet, dass
    ein Ende der äußeren, bogenförmigen Verbindungsfläche (R1) tangential zu der unteren Wand (L2) ist und dass dessen anderes Ende einen anderen Winkel als 0° mit der unteren äußeren Wand (L1) des unteren Abschnitts der Vertiefung bildet.
  2. Webblatt für Luftdüsenwebmaschinen nach Anspruch 1, wobei die äußeren und inneren bogenförmigen Verbindungsflächen (R1, R2), die die untere Wand (L2) der zentralen Aussparung (C) begrenzen, Kreisbögen mit den Radien r1 bzw. r2 sind und die Radien die folgende Beziehung erfüllen: r 1 + r 2 > B
    Figure imgb0004
     wobei B die Breite des unteren Abschnitts der Vertiefung ist, die quer zur Bodenwand (L3) der zentralen Aussparung (C) vorsteht, in Übereinstimmung mit dem breiteren Teil des unteren Abschnitts der Vertiefung.
  3. Webblatt für Luftdüsenwebmaschinen nach Anspruch 2, wobei die untere Wand (L2) und die obere Wand (L4) der zentralen Aussparung (C), in Richtung der Öffnung der zentralen Aussparung (C) in einem Winkel zwischen 12° und 14° voneinander abweichen.
  4. Webblatt für Luftdüsenwebmaschinen nach Anspruch 2, wobei die inneren bogenförmigen Verbindungsflächen (R2, R3), die die untere Wand (L3) der zentralen Aussparung (C) begrenzen, Kreisbögen mit Radien r2 bzw. r3 sind und die Radien die folgende Beziehung erfüllen: r 2 ≤ r 3.
    Figure imgb0005
  5. Webblatt für Luftdüsenwebmaschinen nach Anspruch 4, wobei die Radien r2 und r3 einen Wert gleich oder größer als 1 mm haben.
EP16169465.8A 2015-05-26 2016-05-12 Webblatt für luftdüsenwebmaschinen Active EP3098338B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2015A000706A ITUB20150706A1 (it) 2015-05-26 2015-05-26 Pettine per telai di tessitura ad aria

Publications (3)

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EP3098338A2 EP3098338A2 (de) 2016-11-30
EP3098338A3 EP3098338A3 (de) 2017-01-11
EP3098338B1 true EP3098338B1 (de) 2018-04-18

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EP (1) EP3098338B1 (de)
JP (1) JP6839932B2 (de)
CN (1) CN106192170B (de)
HK (1) HK1231528A1 (de)
IT (1) ITUB20150706A1 (de)
TR (1) TR201810261T4 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023188087A1 (ja) * 2022-03-30 2023-10-05 高山リード株式会社 織機用の筬

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
CH637707A5 (de) * 1979-06-13 1983-08-15 Rueti Ag Maschf Webblatt fuer eine duesenwebmaschine.
JP3366490B2 (ja) * 1994-07-05 2003-01-14 株式会社豊田中央研究所 エアジェットルーム用の変形筬
WO2000061846A1 (fr) * 1999-04-07 2000-10-19 Takayama Reed Co., Ltd. Peigne pour metier a jet d'air et metier a tisser a jet d'air
CN101429701B (zh) * 2003-01-16 2010-12-08 津田驹工业株式会社 空气喷射式织布机用筘
JP5573629B2 (ja) * 2010-11-23 2014-08-20 株式会社豊田自動織機 エアジェットルームの変形筬
CN203475060U (zh) * 2013-08-30 2014-03-12 绍兴县鼎丰纺织器材有限公司 高速节能型喷气织机用钢筘
CN204211924U (zh) * 2014-10-11 2015-03-18 绍兴市水富纺织器材有限公司 高速抗冲击型异形筘

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Publication number Publication date
EP3098338A2 (de) 2016-11-30
HK1231528A1 (zh) 2017-12-22
JP2017020153A (ja) 2017-01-26
ITUB20150706A1 (it) 2016-11-26
EP3098338A3 (de) 2017-01-11
CN106192170B (zh) 2020-05-05
JP6839932B2 (ja) 2021-03-10
TR201810261T4 (tr) 2018-08-27
CN106192170A (zh) 2016-12-07

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