EP0509255B1 - Griffe porteuse pour métiers sans navette - Google Patents

Griffe porteuse pour métiers sans navette Download PDF

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Publication number
EP0509255B1
EP0509255B1 EP92104590A EP92104590A EP0509255B1 EP 0509255 B1 EP0509255 B1 EP 0509255B1 EP 92104590 A EP92104590 A EP 92104590A EP 92104590 A EP92104590 A EP 92104590A EP 0509255 B1 EP0509255 B1 EP 0509255B1
Authority
EP
European Patent Office
Prior art keywords
gripper
clamping member
lamina
carrying
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
EP92104590A
Other languages
German (de)
English (en)
Other versions
EP0509255A1 (fr
Inventor
Ettore Viscardi
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
SOMET Societa Meccanica Tessile SpA
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 SOMET Societa Meccanica Tessile SpA filed Critical SOMET Societa Meccanica Tessile SpA
Publication of EP0509255A1 publication Critical patent/EP0509255A1/fr
Application granted granted Critical
Publication of EP0509255B1 publication Critical patent/EP0509255B1/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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/20—Constructional features of the thread-engaging device on the inserters
    • D03D47/23—Thread grippers
    • D03D47/233—Carrying grippers

Definitions

  • the object of the present invention is a weft yarn carrying gripper for shuttleless looms.
  • grippers are those members in shuttleless looms by means of which the single weft yarns are gripped at one end of the loom and conveyed to the opposite end thereof through the warp shed.
  • the carrying gripper grips the weft yarn from a weft feeding device and carries it to the centre of the shed, while the drawing gripper receives the weft yarn from the carrying gripper, at the centre of the shed, and conveys it to the opposite end of the loom.
  • An example of carrying gripper of the known technique is the one described in FR-A-2635538, in which an elastic clamping member is fixed at the front end of a control lever hinged at the gripper body.
  • the object of the present invention is to actually supply a carrying gripper having no joints with reciprocally movable component parts, and thus no slacks between said parts, so as to ensure a long life to the gripper.
  • a further object of the present invention is to supply a gripper of the aforementioned type, wherein it is possible to regulate the clamping pressure of the weft yarn clamping members, so as to adapt said gripper to different types of yarns.
  • a carrying gripper for shuttleless looms of the type in which the weft yarn is clamped between a pair of clamping members, at least one of which is flexible and movable under the action of control means, external to the gripper, so as to open the clamping zone and allow cleaning thereof
  • the flexible and movable clamping member consists of a lamina, characterized in that the lamina is fixedly connected with an end to the gripper body and kept pressed against the fixed clamping member by spring means acting onto its free end, and in that a stiff lever is fixedly connected to said lamina and is operated by said external control means so as to move the flexible lamina away from the fixed clamping member.
  • Fig. 1 illustrates a carrying gripper comprising the weft yarn clamping members realized according to the present invention.
  • the thin lines show the gripper parts which have not been improved by the invention, so as to make its working more clear as briefly described hereinafter.
  • the carrying gripper of the present invention thus comprises a gripper body 1 - normally obtained by molding of plastic material or of a light alloy - which consists of: the slide 2, onto which the gripper bears during its movement along the shed formed by the warp yarns; a tip 3, apt to deviate on the right side of the gripper a weft yarn (not shown) interposed across its path by a weft presenting device, as the gripper moves into the shed in the direction indicated by the arrow F; and finally a slit 4, into which moves the weft yarn to be clamped by the clamping members described hereinafter.
  • the weft yarn clamping members are meant to clamp the weft yarn, to hold it tight while the carrying gripper moves to the centre of the shed, and then release it to the drawing gripper during weft exchange at the centre of the shed. It is evident, therefore, that the clamping action should be positively reliable and, at the same time, reversible; in other words, it should be strong enough to overcome the resistance opposed by the unwinding weft yarn as the carrying gripper moves along the shed, but also soft enough to release the weft yarn when a sufficiently strong pulling action is positively imparted thereon by the drawing gripper. It is also indispensable for the clamping and release of the weft yarn to take place very smoothly, in order to prevent defibering or tearing thereof.
  • the carrying gripper is equipped with devices to open the clamping members, which are operated each time the gripper moves out of the shed, so that the clamping members can be kept perfectly clean, for instance by blowing a compressed air jet.
  • the weft yarn clamping members comprise a fixed clamping member 5, consisting of a flat metallic lamina firmly fixed onto the gripper body 1 but freely adjustable onto an elastic support 5a, and a movable clamping member 6, also consisting of a flat metallic lamina, but having a characteristic ski-shaped point, i.e. an arched and raised front end 6a.
  • the movable clamping member 6 bears with its front end 6a onto the fixed clamping member 5, so as to clamp the weft yarn in-between, and it is anchored with its rear end 6b onto the gripper body 1 by a pair of screws 7, or by other suitable fixing means.
  • Fig. 1 shows - mounted on the gripper body 1 - a first embodiment of the movable clamping member 6, wherein said member has a continuous surface throughout its length.
  • Fig. 2 shows instead - removed from the gripper body - a second embodiment of the movable clamping member 6, wherein its free front end 6a is divided in two parts by a longitudinal slit. Either of the two embodiments of the movable clamping member 6 can be adopted to satisfy the different clamping requirements of the various weft yarns being woven.
  • the clamping pressure between the members 5 and 6 is determined by a leaf spring 8 acting on the movable clamping member 6.
  • said leaf spring consists of a metallic lamina, fixed at one end to the gripper body 1 - by the same means 7 anchoring the member 6 - and bearing with the opposite end 9 onto the movable clamping member 6.
  • the spring 8 is usually arc-shaped, preferably as an overturned V, so as to impart the required pressure onto the member 6 and allow its adjustment, as described more in detail hereinafter.
  • the end 9 of the spring 8 bearing onto the movable clamping member 6 can be differently shaped according to the type of yarn being woven and to its thickness, so as to obtain the most efficient clamping action.
  • the spring 8 may have, for example, a front end 9 split up in two parts of different length, or else it may be formed in one piece, or even be differently shaped.
  • the movable clamping member 6 is apt to bend in respect of its anchorage points 7, thus moving its front end 6a from the normal working position (dashed lines in fig. 3) to a lifted position (shown in full lines in the same figure), in which it draws apart from the fixed clamping member 5, against the action of the spring 8, thereby allowing the clamping members to be cleaned.
  • the above bending movement of the clamping member 6 is controlled by a lever 10 fixedly connected in 11, in two separate points, to a central zone of said movable clamping member.
  • the lever 10 has a free control end 10a, onto which acts a loom cam (not shown) each time the gripper moves out of the shed.
  • a force in the direction of arrow A (fig. 3)
  • the movable clamping member 6 is subjected to a couple G-G applied on the two fixing points 11, which tends to cause its rotation.
  • Said member, which is instead fixed in 7, undergoes an elastic bending in a hingeing zone between points 7 and 11, which causes the aforementioned lifting of its free end 6a.
  • Adjusting means are provided to regulate the pressure force of the spring 8 acting onto the movable clamping member 6, said means essentially consisting of a wedge element 12 - shown more clearly in fig. 4 - the inclined surface of which cooperates with the underlying overturned V portion of the spring 8.
  • Said wedge element 12 is fixed to the gripper body 1 by screw means 13 housed into a longitudinal slot 14 provided in said element. By loosening the screw means 13, the wedge element 12 can thus be shifted lengthwise, thereby compressing - to a smaller or greater extent - with its inclined surface the spring 8, and thus altering the intensity of its pressure force. More specifically, when the wedge element is shifted in the direction of arrow B (fig. 4), the pressure force imparted by the spring 8 in the direction of arrow C increases, and vice-versa in the contrary case.
  • the carrying gripper described herein comprises no hinged or sliding joints to connect its reciprocally movable component parts, any problems deriving from slacks between said parts, with the respective wears and tolerances, are thereby eliminated.
  • the carrying gripper of the present invention requires neither maintenance nor lubrication. Furthermore, it can easily be adjusted, both by regulating the intensity of the pressure force of the spring 8 - by acting on the wedge element 12 - and by regulating the distribution of said pressure force, by suitably modifying the shape of the end part 9 of said spring 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
  • Clamps And Clips (AREA)

Claims (12)

  1. Griffe porteuse pour métiers sans navette - du type où le fil de trame est serré entre deux organes de serrage formant paire (5, 6), au moins un des organes étant flexible et mobile sous l'action d'un moyen de commande, extérieur à la griffe, afin d'ouvrir la zone de serrage et permettre son nettoyage de sorte que l'organe de serrage flexible et mobile consiste en une lamelle (6), caractérisée en ce que la lamelle est reliée fixement par une extrémité (6b) au corps de griffe (1) et maintenue appuyée contre l'organe de serrage fixe (5) par un moyen élastique (8) agissant sur son extrémité libre (6a), et en ce qu'un levier rigide (10) est relié fixement à ladite lamelle (6) et est actionné par ledit moyen de commande externe afin de déplacer la lamelle flexible (6) loin de l'organe de serrage fixe (5).
  2. Griffe porteuse selon la revendication 1, comprenant également un moyen de réglage (12-14) pour modifier la force de pression du moyen élastique (8) agissant sur l'organe de serrage mobile (6).
  3. Griffe porteuse selon la revendication 1, dans lequel ladite lamelle flexible (6) est en un matériau métallique et son extrémité libre (6a) est recourbée comme la pointe d'un ski.
  4. Griffe porteuse selon la revendication 1, dans lequel l'extrémité libre (6a) de ladite lamelle (6) est divisée en deux parties par une fente longitudinale.
  5. Griffe porteuse selon la revendication 1, dans lequel ladite lamelle flexible (6) est ancrée au corps de griffe (1) par des vis (7).
  6. Griffe porteuse selon la revendication 1, dans lequel ledit moyen élastique consiste en un ressort à lames (8) en forme de V renversé, fixé à une extrémité au corps de griffe (1) et portant avec l'autre extrémité (9) sur l'extrémité libre (6a) de l'organe de serrage mobile (6).
  7. Griffe porteuse selon la revendication 6, dans lequel ledit ressort à lames (8) est fixé au corps de griffe (1) au même point et avec le même moyen (7) que l'organe de serrage mobile (6).
  8. Griffe porteuse selon la revendication 6, dans lequel l'extrémité libre (9) dudit ressort à lames (8) est divisée en deux parties, éventuellement de longueur différente, par une fente longitudinale.
  9. Griffe porteuse selon la revendication 1, dans lequel ledit levier (10) est fixé sur une zone sensiblement centrale de la lamelle (6), entre son extrémité ancrée (6b) et son extrémité libre (6a).
  10. Griffe porteuse selon la revendication 9, dans lequel ledit levier (10) est fixé sur ladite lamelle (6) en correspondance d'au moins deux points distincts (11).
  11. Griffe porteuse selon les revendications 2 et 6, dans lequel ledit moyen de réglage consiste en un élément en coin (12), glissant longitudinalement le long du corps de griffe (1) et apte à être fixé à celui-ci dans une position au choix, la surface inclinée dudit élément (12) coopérant avec la surface inclinée de la portion en forme de V renversé dudit ressort à lames (8).
  12. Griffe porteuse selon la revendication 11, dans lequel ledit élément en coin (12) est fixé au corps de griffe (1) par une vis (13) logée dans une fente longitudinale (14) dudit élément.
EP92104590A 1991-03-22 1992-03-17 Griffe porteuse pour métiers sans navette Expired - Lifetime EP0509255B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI910784 1991-03-22
ITMI910784A IT1245579B (it) 1991-03-22 1991-03-22 Pinza portante per telai di tessitura senza navetta

Publications (2)

Publication Number Publication Date
EP0509255A1 EP0509255A1 (fr) 1992-10-21
EP0509255B1 true EP0509255B1 (fr) 1996-07-10

Family

ID=11359205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92104590A Expired - Lifetime EP0509255B1 (fr) 1991-03-22 1992-03-17 Griffe porteuse pour métiers sans navette

Country Status (5)

Country Link
EP (1) EP0509255B1 (fr)
AT (1) ATE140275T1 (fr)
DE (1) DE69212040T2 (fr)
ES (1) ES2090389T3 (fr)
IT (1) IT1245579B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59705563D1 (de) * 1996-06-07 2002-01-10 Picanol Nv Gebergreifer für eine greiferwebmaschine
BE1010334A3 (nl) * 1996-06-07 1998-06-02 Picanol Nv Inrichting voor het inbrengen van een inslagdraad bij een grijperweefmachine.
EP0984089B1 (fr) * 1998-09-02 2003-12-10 Sultex AG Procédé et dispositif pour l'insertion d'un fil de trame dans un métier à tisser à griffes
DE59908000D1 (de) * 1998-09-02 2004-01-22 Sultex Ag Rueti Verfahren und System zum Eintragen eines Schussfadens in einer Greiferwebmaschine
BE1012242A3 (nl) * 1998-10-21 2000-08-01 Picanol Nv Draadklem voor een grijper van een grijperweefmachine.
ATE315119T1 (de) * 1998-10-21 2006-02-15 Picanol Nv Fadenklemme für einen greifer einer greiferwebmaschine
EP1249527A1 (fr) * 2001-04-10 2002-10-16 Promatech S.p.A. Pince d'amenée à pincement progressif du fil pour métiers à tisser
ATE434068T1 (de) * 2001-05-08 2009-07-15 Promatech Spa Mit bezug auf die schussfadendicke einstellbarer bringergreifer für webmaschinen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1480561A (fr) * 1966-05-18 1967-05-12 Nuovo Pignone Spa Dispositif passe-trame pour métiers à tisser à alimentation continue
CH482852A (it) * 1967-09-19 1969-12-15 Somet Soc Mec Tessile Coppia di pinze di trasporto della trama per telai di tessitura ad alimentazione continua della trama
IT1226865B (it) * 1988-08-19 1991-02-20 Nuovo Pignone Spa Perfezionamenti in una pinza passatrama di condotta per telai tessili senza navetta.
IT1238606B (it) * 1990-01-26 1993-08-18 Nuovo Pignone Spa Dispositivo perfezionato di pinzatura del filo di trama in un telaio tessile senza navetta

Also Published As

Publication number Publication date
ES2090389T3 (es) 1996-10-16
IT1245579B (it) 1994-09-29
ATE140275T1 (de) 1996-07-15
DE69212040T2 (de) 1997-03-06
ITMI910784A1 (it) 1992-09-22
ITMI910784A0 (it) 1991-03-22
EP0509255A1 (fr) 1992-10-21
DE69212040D1 (de) 1996-08-14

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