EP2800829B1 - Dispositif pour former une lisière creuse en tissu sur des métiers à tisser sans navette - Google Patents

Dispositif pour former une lisière creuse en tissu sur des métiers à tisser sans navette Download PDF

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Publication number
EP2800829B1
EP2800829B1 EP12791279.8A EP12791279A EP2800829B1 EP 2800829 B1 EP2800829 B1 EP 2800829B1 EP 12791279 A EP12791279 A EP 12791279A EP 2800829 B1 EP2800829 B1 EP 2800829B1
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EP
European Patent Office
Prior art keywords
fabric
taking
group
weft
cutting group
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EP12791279.8A
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German (de)
English (en)
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EP2800829A2 (fr
Inventor
Antonio Nicolini
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Manea Textile Srl
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Manea Textile Srl
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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
    • D03D47/40—Forming selvedges
    • D03D47/48—Forming selvedges by inserting cut end of weft in next shed, e.g. by tucking, by blowing

Definitions

  • the present invention relates to webbing and in particular it relates to a device for forming a fabric recessed selvedge for shuttleless looms.
  • the invention concerns a selvedge device having a simple and compact structure so as to achieve lightness and stiffness features that are needed for the high working speed of the looms; specifically, the invention concerns a device which is exclusively constituted by mechanical components, particularly suitable for forming a recessed selvedge to the side edges of a fabric by using a method of folding the tails of the weft within the mouth formed by the warp yarns in a shuttleless loom.
  • the side edges of the fabric are obtained by reinserting the weft tails into the shed soon after that the loom comb has beaten the weft, thereby forming the so-called "tucked or recessed selvedge"; therefore, it is not necessary to reinforce the fabric edges with mechanical systems for twisting and rotating additional warp yarns, which are not very reliable.
  • selvedges re-entering process is normally carried out by means of known selvedge devices, which comprise means for gripping and cutting the weft yarn that is inserted in the warp passage; in practice, the operation of said selvedge devices is based on the fact that a needle is used to grasp the end of the cut weft thread, the so-called “pigtail”, to make it fit, folded, into the warp shed, as soon as the latter is opened again for the next step, so as to be stretched again and beaten with the next weft, thus creating a recessed selvedge.
  • the Italian patent IT 1244762 describes a mechanism for selecting the movement of the movable members of a device for forming a fabric recessed selvedge, which is constituted by a touch probe hinged at one end on the device's casing; the mechanism is cooperating, through a spring, with one of the cams actuating the control levers of the movable members, so as to cause an oscillation of a bridge small castle, integral with said mechanism, from a first to a second position.
  • the bridge of the small castle interacts with the abutments of the actuating levers in order to block them in a fixed position, while in the second position there is no longer interaction and a metal anchor which is integral with the touch probe is supported by an electromagnetic device.
  • the known mechanical selvedge devices are suitable to work on looms operating at few revolutions per minute and, for this reason, they are not easily adaptable to the most recent looms, which are able to operate at a very high number of revolutions per minute, because the needle and the weft yarn gripping and cutting means are controlled by kinematic means that are very complex and bulky and therefore they cannot operate at the high speeds that are reached by the modern looms.
  • the Italian patent IT 1251849 describes a device for forming a recessed selvedge in an air jet loom, comprising devices for inserting the weft yarn inside the shed, a comb to beat the yarn when inserted, and weft cutting means; the device also includes suction and cutting means, which are moved with independent cyclical movements, so that said means are switched from a first position to a second position and to a third position in the following way:
  • a device for forming a fabric recessed selvedge having the technical features of the preamble of the appended claim 1 is known for example from EP454238A1 .
  • a selvedge forming device with pulleys, a toothed belt and a belt tensioner is known from JP200100342 .
  • the main object of the present invention is, therefore, to obviate the above mentioned drawbacks of the prior art, by making an improved device for forming a fabric recessed selvedge, that is entirely adaptable to the modern shuttleless looms.
  • Another object of the invention is to provide a device for forming a fabric recessed selvedge for shuttleless looms, which guarantees high precision and functional, mechanical and technological reliability, when the weft ends (“pigtails”) go back into the warp mouth or shed.
  • Another object of the invention is to provide a device for forming a fabric recessed selvedge for shuttleless looms, which includes yarn processing units that are able to perform repeatable instantaneous movements.
  • a further object of the present invention is to provide a device for forming a fabric recessed selvedge for shuttleless looms, which has a simple and compact structure in order to achieve lightness and stiffness features that are needed for the higher working speeds of the modern looms.
  • Another object of the invention is to provide a device for forming a fabric recessed selvedge for shuttleless looms, which is able to minimize the length of weft ends, resulting in a narrow fabric recessed selvedge, and which is able to eliminate, at the same time, the need for a comb cutting when central recessed selvedges are provided.
  • the device for forming fabric recessed selvedges allows to obtain a remarkable functional reliability when the weft ends re-enter the warp mouth; this is due to the accuracy and repeatability of the movements of the yarn processing units.
  • said device has a simple and compact structure, thereby achieving lightness and stiffness features that are needed for the high working speeds of the modern shuttleless looms; in particular, the size of the group including a leg and a shear, which are able to process the yarn, are extremely compact and suitable for minimizing the length of the re-entering weft ends, resulting in a suitably narrow fabric recessed selvedge.
  • the selvedge device allows operation without interference with the group consisting of the leg and the shear and with the comb, when the comb is ready for beating, thus avoiding a comb cut when central recessed selvedges are provided and thus allowing to make horizontal adjustments of the leg-shear group and the hook group that are perpendicular to the fabric making line, depending on the "recovery” given by the elastic displacement of said fabric making line when the comb is ready for beating.
  • the device 100 for forming fabric recessed selvedges according to the invention substantially comprises:
  • Each rod 7, 8, 9 is secured to a respective gear 10, 11, 12, which is driven, in turn, during its linear translation motion, by a respective pair of conjugated cams 13, 14, 15, which act on the corresponding touch probes 13', 14', 15', while the rotary oscillation motion of the hook group 4 is controlled by a suitable pair of conjugated cams 16, which acts, through the touch probes 16', on a L-shaped lever 18, which, through a tie rod 19, is able to rotate the sleeve 20.
  • the rod 9 is able to slide longitudinally inside the sleeve 20; moreover, the rod 9, inside the sleeve 20, is shaped so as to control the rotation while allowing an axial sliding (as shown in detail in the attached figure 4 ), thus being able to control the rotation of the needle 5; in particular, said rod 9 can be shaped as a shackle member or can be replaced with generic grooved couplings.
  • the structure of the above mentioned mechanical control units is particularly simple and effective, as well as the movable units of the device according to the invention are rather light, easy to assemble and stiff, so as to guarantee precision and repeatability for handling the weft ends also at working high speeds of the looms.
  • the three conjugated cams 13, 14, 15 which drive the translation of the rods 7, 8, 9 and the conjugated cam 16 which drives the rotation of the rod 9 are all mounted on the drive shaft 21, driven by a toothed pulley 22, which is in turn connected, through a toothed belt 23 having a belt tensioner 24, to a second toothed pulley 25, mounted on the shaft 25', which protrudes from the gear casing able to take its motion from a command underlying the fabric 3.
  • the loosening of the belt tensioner 24 provided on the toothed belt 23 allows a longitudinal sliding, in a direction perpendicular to the comb 40, of the entire device 100 in an advanced or retracted position with respect to the support plate 1".
  • the belt tensioner 24 is repositioned to restore the tension needed for a proper functioning of the toothed belt 23.
  • a "selvedge re-entering" cycle may be summarized as follows.
  • the leg-shear group 1 is maintained in a vertical position to receive the weft 2; in this position (shown in detail in the attached figure 5 ), the shear 27 is open and the grasping foot 28 is kept open and lowered by a suitable cam 29, which acts on the top of the stem 28' of the foot 28 and which is mounted on the rod 9 of the hook group 4, while the needle 5 is maintained in a raised position, outside the warp 6, by actuating the rod 9.
  • the two driving rods 7, 8 of the leg-shear group 1 may move and translate synchronously to push forward or backward the whole leg-shear group 1 or may translate at different distances so as to rotate the portion 33 of the group 1 around the pivoting pin 30 and to obtain the fabric weft cutting through the shear 27 and the winding of the weft yarn 2, held by the foot 28, around the needle 5.
  • the hook or needle 5 actuated by the roto-translating motion of the driven rod 7, engages the weft yarn 2 and drags it inside the warp shed, where it is beaten by the comb 40 together with the weft which is inserted subsequently the weft yarn 2.
  • the opening of the grasping foot 28, which is carried out by the hook group 4 takes place while the leg-shear group 1 is steady, that is to say without movements for opening or closing said group 1 (as instead realized in other known devices), thus minimizing the overall dimension of the leg-shear group 1 (as well as the functional spaces), so that when it devices for forming central recessed selvedges (such as the device shown in the attached figures 7-10 ), that are used when several fabrics are made with a same loom, are needed, it is not necessary to cut the comb 40 in the space between two adjacent fabrics, thus making more versatile the use of the combs.
  • the attached figures 7-10 show respective views of a device 101 for forming fabric central recessed selvedges; the device 101 is made by introducing within a same casing 101', similar to the casing 1' of figure 1 , two twin similar groups having the same functionality as that of the lateral group described above; in particular, in the attached figures 7-10 , the elements having structural and functional characteristics that are similar or equal to the characteristics of the elements shown in the attached figures 6-10 are indicated with the same reference numbers.
  • the shape and dimensions of the device according to the invention allows to minimize the inevitable bending and/or vibrations of the leg-shear group, ensuring the repeatability of the movement and positions with respect to the yarn and/or to the weft end.
  • the action of the cam 29, which is applied to the hook axis and which, through the rotation of said axis, provides for opening the leg to house the weft yarn and for closing the leg to hold it in a following step when it is wounded around the hook without any movement of the leg-shear group allows to reduce the size of said leg-shear group in a direction perpendicular to the comb, so as not to interfere with said comb when it is ready for beating; according to the prior art, in fact, the leg is usually opened by the reciprocal actions that take place between the different portions of the leg-shear group, which must also perform wide translations and rotations to carry out the yarn cutting and the yarn wrapping around the hook.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Replacement Of Web Rolls (AREA)
  • Vending Machines For Individual Products (AREA)

Claims (6)

  1. Dispositif (100, 101) pour former une lisière creuse en tissu (3) sur des métiers à tisser sans navette comprenant sensiblement
    - un groupe de saisie et de coupe (1), constitué d'au moins un pied (28) et d'au moins un organe de coupe (27), qui est maintenu verticalement afin de saisir et couper à dimension au moins une queue d'un fil de trame (2) faisant saillie à partir d'un bord d'un tissu (3),
    - au moins un groupe de crochetage (4), qui comprend au moins un crochet ou une aiguille (5), ladite queue du fil de trame (2) étant enroulée autour dudit crochet ou de ladite aiguille (5) et étant tirée et pliée vers le centre du tissu (3), entre les fils de chaîne (6) agencés pour l'insertion des queues de trame (2),
    - au moins deux premières tiges (7, 8), parallèles entre elles et se déplaçant selon un mouvement de translation alternée, qui sont aptes à entraîner ledit groupe de saisie et de coupe (1),
    - au moins une seconde tige (9), parallèle auxdites premières tiges (7, 8) et se déplaçant selon un mouvement de rotation ou de translation, qui est apte à entraîner ledit groupe de crochetage (4),
    dans lequel chacune desdites premières (7, 8) et seconde (9) tiges est liée à un chariot respectif (10, 11, 12), entraîné lui-même pour se déplacer en translation de façon linéaire au moyen d'au moins une paire respective de premières cames associées (13, 14, 15), qui agissent sur des premiers moyens de sonde correspondants (13', 14', 15'), alors que ledit groupe de crochetage (4) est entraîné selon un mouvement de rotation oscillant au moyen d'au moins une paire de secondes cames associées (16) agissant, au travers de seconds moyens de sonde (16'), sur au moins un levier (18), qui entraîne en rotation au moins un manchon (20), ladite seconde tige (9) étant insérée de manière longitudinale dans ledit manchon (20),
    dans lequel lesdites premières (13, 14, 15) et secondes cames associées (16) sont montées sur au moins un arbre d'entraînement (21),
    caractérisé en ce que ledit arbre d'entraînement (21) est entraîné par au moins une première poulie dentée (22) du dispositif (100, 101) qui est reliée, via une courroie dentée (23) équipée d'un tendeur de courroie (24) du dispositif (100, 101), à au moins une seconde poulie dentée (25) du dispositif (100, 101), qui est montée sur un arbre (25') sortant d'une boîte de vitesses apte à saisir le mouvement à partir d'une commande placée sous ledit tissu (3), et
    caractérisé en ce que ledit tendeur de courroie (24) est mobile de manière à permettre le coulissement dudit groupe de saisie et de coupe (1) par rapport à une plaque de support (1") du dispositif (100, 101).
  2. Dispositif (100, 101) selon la revendication 1, caractérisé en ce que, à l'intérieur dudit manchon (20), ladite seconde tige (9) est formée de manière à tourner et à coulisser axialement, ladite seconde tige (9) étant également apte à entraîner en rotation ledit crochet ou ladite aiguille (5).
  3. Dispositif (100, 101) selon au moins une des revendications précédentes, caractérisé en ce que des moyens sont prévus pour faire coulisser longitudinalement ledit groupe de saisie et de coupe (1) dans une direction qui est perpendiculaire à un peigne (40) du métier à tisser, de manière à approcher le groupe de saisie et de coupe (1) d'un bord de formation de tissu (3) ou à l'éloigner dudit bord de formation de tissu (3).
  4. Dispositif (100, 101) selon au moins une des revendications précédentes, caractérisé en ce que ledit pied (28) du groupe de saisie et de coupe (1) est entraîné par une came relative (29), qui agit sur la partie supérieure d'une tige (28') dudit pied (28) et qui est montée sur ladite seconde tige (9) du groupe de crochetage (4), ladite seconde tige (9) étant apte à entraîner ledit crochet ou ladite aiguille (5) dans une position levée en dehors de la chaîne (6) du tissu (3) ou dans une position baissée sur ladite chaîne (6) du tissu (3).
  5. Dispositif (100, 101) selon au moins une des revendications précédentes, caractérisé en ce que lesdites premières tiges (7, 8), qui entraînent ledit groupe de saisie et de coupe (1), sont aptes à pousser vers l'avant ou l'arrière ledit groupe de saisie et de coupe (1) ou à décaler de différentes longueurs, de manière à faire tourner au moins une partie (33) dudit groupe de saisie et de coupe (1), afin de couper la trame (2) de tissu (3) au moyen dudit organe de coupe (27) et d'enrouler ladite queue de trame (2), qui est retenue par ledit pied (28) dudit groupe de saisie et de coupe (1), autour dudit crochet ou de ladite aiguille (5), ledit crochet ou ladite aiguille (5) étant apte à amener ladite queue de trame (2) à l'intérieur de la foule de chaîne, où un peigne (40) du métier à tisser est prévu pour battre la queue de trame (2) conjointement avec la trame suivante.
  6. Dispositif (100, 101) selon la revendication 4, caractérisé par le fait que ledit groupe de crochetage (4) entraîne l'ouverture dudit pied (28) du groupe de saisie et de coupe (1), alors que ledit groupe de saisie et de coupe (1) est fixe.
EP12791279.8A 2011-09-22 2012-09-21 Dispositif pour former une lisière creuse en tissu sur des métiers à tisser sans navette Active EP2800829B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000255A ITVI20110255A1 (it) 2011-09-22 2011-09-22 Dispositivo per la formazione di una cimossa rientrata del tessuto in telai senza navetta
PCT/IT2012/000292 WO2013042158A2 (fr) 2011-09-22 2012-09-21 Dispositif pour former une lisière creuse en tissu sur des métiers à tisser sans navette

Publications (2)

Publication Number Publication Date
EP2800829A2 EP2800829A2 (fr) 2014-11-12
EP2800829B1 true EP2800829B1 (fr) 2017-06-28

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EP12791279.8A Active EP2800829B1 (fr) 2011-09-22 2012-09-21 Dispositif pour former une lisière creuse en tissu sur des métiers à tisser sans navette

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EP (1) EP2800829B1 (fr)
IT (1) ITVI20110255A1 (fr)
WO (1) WO2013042158A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11602429B2 (en) 2019-04-01 2023-03-14 Neovasc Tiara Inc. Controllably deployable prosthetic valve

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
CN106435966B (zh) * 2016-08-31 2018-02-02 绍兴通用提花机械有限公司 一种织机的套边装置
IT201600122838A1 (it) * 2016-12-02 2018-06-02 Itema Spa Leverismo di comando per cimossatrice a testa di lavoro mobile per macchine tessili
IT201900000631A1 (it) 2019-01-15 2020-07-15 Rinaldo Sperotto Cimossatrice elettro-pneumatica
IT201900007794A1 (it) 2019-05-31 2020-12-01 Manea Textile S R L Cimossatrice meccanica motorizzata

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IT999226B (it) 1973-11-06 1976-02-20 Nuovo Pignone Spa Procedimento e dispositivi per ot tenere il ripiego nel passo di en trambi i capi del filo di trama in un tessuto realizzato con un telaio senza navetta ad alimentazione con tinua dei fili di trama
DE2615829A1 (de) 1975-04-16 1976-10-28 Manea S N C Costruzioni Meccan Geraet zur bildung von webkanten in geweben
IT1239713B (it) * 1990-04-20 1993-11-15 Cem Italia Cimossatrice perfezionata per la formazione di una cimossa rientrata in un tessuto prodotto su telaio senza navetta
IT1244762B (it) 1991-03-08 1994-08-08 Nuovo Pignone Spa Meccanismo perfezionato di selezione della movimentazione degli organi mobili del dispositivo di formazione di una cimossa rientrata, particolarmente adatto ai telai per spugna
IT1251849B (it) 1991-09-23 1995-05-26 Somet Soc Mec Tessile Metodo per la formazione della cimossa rientrata in telai senza navetta ed in particolare in telai ad aria e dispositivo per realizzare tale metodo
JP4006890B2 (ja) * 1999-06-17 2007-11-14 株式会社豊田自動織機 織機のタックイン装置における風綿付着防止装置
DE502006007250D1 (de) * 2005-02-23 2010-08-05 Itema Switzerland Ltd Leistenleger für Schussfäden

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11602429B2 (en) 2019-04-01 2023-03-14 Neovasc Tiara Inc. Controllably deployable prosthetic valve

Also Published As

Publication number Publication date
EP2800829A2 (fr) 2014-11-12
WO2013042158A3 (fr) 2014-03-13
WO2013042158A2 (fr) 2013-03-28
ITVI20110255A1 (it) 2013-03-23

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