EP1403408B1 - Dispositif de formation de fausse lisière pour métiers à tisser - Google Patents

Dispositif de formation de fausse lisière pour métiers à tisser Download PDF

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Publication number
EP1403408B1
EP1403408B1 EP03103517A EP03103517A EP1403408B1 EP 1403408 B1 EP1403408 B1 EP 1403408B1 EP 03103517 A EP03103517 A EP 03103517A EP 03103517 A EP03103517 A EP 03103517A EP 1403408 B1 EP1403408 B1 EP 1403408B1
Authority
EP
European Patent Office
Prior art keywords
heddles
cords
rotating member
drive shaft
fixed
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.)
Expired - Lifetime
Application number
EP03103517A
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German (de)
English (en)
Other versions
EP1403408A1 (fr
Inventor
Roberto Nani
Angelo Gallizioli
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.)
Promatech SpA
Original Assignee
Promatech SpA
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Filing date
Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP1403408A1 publication Critical patent/EP1403408A1/fr
Application granted granted Critical
Publication of EP1403408B1 publication Critical patent/EP1403408B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D03D47/40—Forming selvedges
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C11/00—Selvedge shedding mechanisms not forming part of main shedding mechanism

Definitions

  • the present invention relates to a false selvedge forming device in gripper or air textile looms.
  • false selvedge is a short lateral section of the fabric where the warp and weft yarns are suitably interlaced so as to tie and keep taut the free ends of the weft yarns, during and immediately following their insertion, so that it is then possible to perform correct cutting and therefore provide the fabric with an optimum finish along the sides.
  • the weft yarn is inserted between two series of warp yarns (up to about twenty for each side of the fabric) which open alternately with a uniform lateral warp shed and with a specific weave (for example one-one or two-two), independent of that of the main fabric.
  • the warp yarns are controlled by yarn-guide elements (heddles) in turn normally operated by sliders moved by means of suitable drive mechanisms.
  • This type of selvedge forming device has proved to be more versatile and preferable, among other things because, being free from any mechanical connection to the main movement system of the loom, it may be easily adjusted and applied to or removed from the loom in a very simple manner.
  • the slider for moving the heddles is typically operated by means of a substantially rigid transmission system acting on only one end, namely operating alternately with a pulling and pushing force. If the sliders and the heddles are not perfectly guided, operational malfunctions may occur, such as seizing, which could also produce deformations or in any case irregularities in the weave.
  • It is an object of the present invention provide a novel control system for forming the false selvedge, which is compact and low-cost, which envisages a minimum number of mechanical transmission members and which allows the heddles to be operated at both ends.
  • a further object of the invention is to provide a system which still preserve some degrees of elasticity able to take up any malfunctions.
  • Fig. 1 is a front elevation view of a device according to the invention
  • Fig. 1A is an enlarged view of the detail indicated by "A" in Fig. 1;
  • Fig. 2 is a perspective view of the device according to Fig. 1;
  • FIGs. 2A and 2B are enlarged views of the details indicated respectively by “B” and “C” in Fig. 2;
  • Fig. 3 is a schematic, partially interrupted, elevation view which illustrates the position of the device according to the invention on a loom;
  • Fig. 4 is a perspective view of a second embodiment according to the invention. amd
  • Figs. 4A and 4B are enlarged views of the details indicated by "D" and "E” in Fig. 4.
  • Figs. 1 and 2 show a first device to form the false selvedge according to the invention.
  • An electric motor M is mounted on a base-piece or base plate 1 and has, fixed to its rotational spindle, a pulley 2 provided with a tighteable groove 3.
  • the groove is formed between two plates 2a and 2b which may be tightened together by means of Allen screws 4 (Fig. 2B).
  • the motor M is rotationally controlled in an alternating manner, with rotational amplitudes depending on the desired degree of displacement in the movement, in accordance with methods which are well-known in the sector.
  • the individual cords 6i are grouped together in converging bundles and then joined to the ends of the cable 5 using a known technique, for example by means of a clamp 7. It will be noted that, for reasons of clarity, in Figs. 1-3 the cords 6 are shown very schematically, but a person skilled in the art will be able to understand fully the actual arrangement.
  • the bottom end of the base-piece 1 (with reference to the working position of the device) is provided with a yarn-guide plate 8 having an ordered plurality of holes equal in number to the number of cords 6i: the latter are thus inserted into these holes and then fixed to the ends of eyed heddles 9, of the known type, each of which is able to operate a warp yarn of the false selvedge.
  • a double array of heddles is thus obtained, a first series belonging to the first bundles of cords and a second series belonging to the second bundle of cords.
  • An extension arm 1a is also fixed onto the base-piece 1, said arm extending parallel to the cords and to the heddles and having, at its distal end, a fixing clamp 10.
  • a plurality of resilient elements 11 (one per heddle) is arranged between the fixing clamp 10 and the bottom end of the heddles 9, said elements being able to impart a resilient recall tension to the heddles 9.
  • the resilient elements 11 are, for example, in the form of torsional springs.
  • the fixing clamp 10 is preferably mounted in an axially adjustable manner along the arm 1a.
  • the resilient elements 11 not only keep the heddles 9 tensioned such that they remain aligned with each other in the correct position, but also produce the necessary recall force for the downward return movement of the said heddles, since the cords 6 are only able to transmit a tension force directed upwards.
  • the elastic characteristics of the elements 11 are suitably chosen so as to have a sufficient downward recall force and at the same time prevent the own frequencies of the system assuming values dangerously close to the operating frequencies of the device.
  • the mode of operation of the system is thus evident.
  • the motor M is controlled, for example by means of an electric axis with the main motor of the loom, so as to perform alternating rotations in both directions, said rotations - by means of the pulley 2 and the cable 5 - being converted into an alternating raising action of the two bundles of cords 6.
  • the two arrays of heddles 9 are alternately raised, by means of the raising action illustrated above, and lowered, as a result of the recall effect of the resilient elements 11.
  • Fig. 3 shows the position assumed by the device according to the invention on the loom.
  • the base-piece 1 is supported and rigidly fixed to a cross-member T of the loom. Due to the compactness of the device, the bundles of cords and the extension arm 1a are easily accommodated in the restricted space between the reed P and the heddle frame group Q, at a height such that the heddles 9 are able to operate correctly in the region of the warp shed Bo.
  • the device described does not have complex mechanical transmission members interacting with each other, most of the movement being ensured by slender cords and resilient elements. This results in low inertia and minimum friction, thereby fully complying with some of the objects mentioned in the introduction. Moreover, the weaving members, i.e. the heddles 9, are subject only to tractional forces in the two directions, which helps reduce the likelyhead of malfunctions.
  • the presence of the springs 11 also introduces into the system a certain degree of elasticity which is able to absorb, without excessive stresses, any seizing or malfunctions, thereby also achieving another desired object.
  • the two arrays of heddles 9 are fixed at the bottom, to bottom cords 12 instead of to resilient elements.
  • the bottom cords 12 pass through a second holed yarn-guide plate 13 (Fig. 4A), which keeps them correctly spaced and guided, and then converge into two bottom bundles 12a and 12b tied in a similar manner to that described for the upper cords 6.
  • the ends of the two bottom bundles 12a and 12b are joined to the two ends of a transmission cable 14 passing around a transmission pulley 15 - and preferably "clamped" there as in the case of the cable 5 and the upper pulley 2 - said pulley 15 being installed rotatably on a bottom base-piece 16 fixed to the arm 1a.
  • the bottom base-piece 16 is mounted on the arm 1a by means of resilient means which pull it downwards, so as to keep the bottom bundles 12a and 12b always properly tensioned with the associated heddles and upper cords.
  • the number of heddles and cords which make up the pair of arrays illustrated in the figures is not to be regarded as limiting, it also being possible to reduce to a single unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Invalid Beds And Related Equipment (AREA)
  • Tents Or Canopies (AREA)
  • Seal Device For Vehicle (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (11)

  1. Dispositif de formation de fausse lisière dans des métiers à tisser du type comprenant un arbre d'entraínement apte à avoir un mouvement de rotation alterné et une paire d'agencements de lisses, pour déplacer des fils de chaíne, raccordée par des moyens de transmission respectifs audit arbre d'entraínement pour un mouvement de va-et-vient, caractérisé en ce que lesdits moyens de transmission sont sous la forme d'une paire de faisceaux de cordes (6), d'une part raccordée aux extrémités supérieures desdites lisses (9) et, d'autre part, convergeant vers deux points opposés d'un organe rotatif (2) fixé audit arbre d 'entrainement, les extrémités inférieures des lisses étant retenues par des moyens de tension (11).
  2. Dispositif selon la revendication 1, dans lequel lesdites cordes (6) passent dans des trous d'une plaque de guide-fil (8) disposée entre les extrémités des lisses (9) et ledit organe rotatif (2).
  3. Dispositif selon la revendication 1 ou 2, dans lequel lesdits moyens de tension (11) comprennent des moyens élastiques fixés à une bride (10) fixée au-delà des lisses (9), sur le côté à l'opposé des cordes.
  4. Dispositif selon la revendication 3, dans lequel ladite bride (10) est fixée à une extrémité distale d'un bras d'extension (1a) d'un seul tenant avec une plaque de base (1) sur laquelle ledit organe rotatif (2) est monté en rotation.
  5. Dispositif selon la revendication 4, dans lequel ladite bride (10) est réglable en position sur ledit bras (1a).
  6. Dispositif selon l'une quelconque des revendications 3 à 5, dans lequel lesdits moyens élastiques sont des ressorts de torsion.
  7. Dispositif selon la revendication 1 ou 2, dans lequel lesdits moyens de tension sont des moyens à deux sens de marche (14, 15) qui raccordent les extrémités inférieures des deux agencements de lisses (2) afin d'inverser le sens de transmission d'une force.
  8. Dispositif selon la revendication 7, dans lequel lesdits moyens à deux sens de marche sont sous la forme d'un câble (14) qui est agencé autour d'une poulie (15) et dont les extrémités sont raccordées auxdits deux agencements de lisses (9).
  9. Dispositif selon la revendication 8, dans lequel ladite poulie (15) est montée sur un élément de support (16) contraint par des moyens élastiques qui s'opposent à la tension communiquée aux lisses par ledit organe rotatif.
  10. Dispositif selon l'une quelconque des revendications précédentes, dans lequel ledit organe rotatif (2) a essentiellement la forme d'une roue composée de deux portions (2a, 2b), l'une d'elles pouvant être raccordée à l'autre avec force afin de serrer entre elles un moyen (5) pour connexion auxdites extrémités des faisceaux convergents (6).
  11. Dispositif selon la revendication 10, dans lequel ledit moyen de connexion a la forme d'un câble (5) qui est fixé sur ladite roue (2) et dont les extrémités sont raccordées aux deux faisceaux convergents de cordes.
EP03103517A 2002-09-26 2003-09-23 Dispositif de formation de fausse lisière pour métiers à tisser Expired - Lifetime EP1403408B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20022044 2002-09-26
IT002044A ITMI20022044A1 (it) 2002-09-26 2002-09-26 Dispositivo di legatura della falsa cimosa in telai tessili

Publications (2)

Publication Number Publication Date
EP1403408A1 EP1403408A1 (fr) 2004-03-31
EP1403408B1 true EP1403408B1 (fr) 2005-12-14

Family

ID=31972211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03103517A Expired - Lifetime EP1403408B1 (fr) 2002-09-26 2003-09-23 Dispositif de formation de fausse lisière pour métiers à tisser

Country Status (5)

Country Link
EP (1) EP1403408B1 (fr)
AT (1) ATE312964T1 (fr)
DE (1) DE60302737T2 (fr)
ES (1) ES2254869T3 (fr)
IT (1) ITMI20022044A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1783254B1 (fr) * 2005-11-04 2010-03-24 Promatech S.p.A. Dispositif de tissage de fils de chaîne pour la formation de lisière dans les métiers à tisser
JP4802805B2 (ja) * 2006-03-28 2011-10-26 株式会社豊田自動織機 織機における耳糸開口装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1009375A6 (nl) * 1995-05-29 1997-02-04 Picanol Nv Kanteninrichting voor weefmachines.
FR2735795B1 (fr) * 1995-06-20 1997-07-18 Icbt Diederichs Sa Dispositif pour la realisation d'une fausse lisiere a pas de gaze sur une machine a tisser
IT1293618B1 (it) * 1997-07-17 1999-03-08 Vamatex Nuova Spa Dispositivo di comando per la legatura a giro inglese in telai di tessitura
DE59905063D1 (de) * 1998-12-09 2003-05-22 Sultex Ag Rueti Einrichtung zum gesteuerten Bewegen eines Kettfadens
FR2794141B1 (fr) * 1999-05-27 2001-07-13 Staubli Gmbh Dispositif de formation de la foule pour la realisation d'une lisiere et metier a tisser equipe d'un tel dispositif

Also Published As

Publication number Publication date
ES2254869T3 (es) 2006-06-16
DE60302737T2 (de) 2006-08-03
ITMI20022044A1 (it) 2004-03-27
DE60302737D1 (de) 2006-01-19
EP1403408A1 (fr) 2004-03-31
ATE312964T1 (de) 2005-12-15

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