EP0504899B1 - Mitnehmergreifer für schützenlose Webmaschinen, insbesondere zum Weben von synthetischen Fäden - Google Patents

Mitnehmergreifer für schützenlose Webmaschinen, insbesondere zum Weben von synthetischen Fäden Download PDF

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Publication number
EP0504899B1
EP0504899B1 EP92104815A EP92104815A EP0504899B1 EP 0504899 B1 EP0504899 B1 EP 0504899B1 EP 92104815 A EP92104815 A EP 92104815A EP 92104815 A EP92104815 A EP 92104815A EP 0504899 B1 EP0504899 B1 EP 0504899B1
Authority
EP
European Patent Office
Prior art keywords
gripper
clamping
metallic
lamina
drawing gripper
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
EP92104815A
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English (en)
French (fr)
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EP0504899A1 (de
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 EP0504899A1 publication Critical patent/EP0504899A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • D03D47/236—Drawing grippers

Definitions

  • the present invention concerns a weft yarn drawing gripper for shuttleless looms.
  • the "grippers" are members of shuttleless looms by means of which the weft yarns are picked up at one side of the loom and carried through the warp shed to the opposite side of the loom.
  • the carrying gripper picks up the weft yarn from a weft feeding device at one end of the shed and carries it up to the middle of the shed, while the drawing gripper receives the weft yarn from the carrying gripper, at the middle of the shed, and draws it to the opposite end of the shed.
  • grippers have been proposed in the art, whose clamping member consists of, rather than a stiff member, a flexible elastic member.
  • EP-137 377 discloses, e.g., grippers for shuttleless looms wherein the clamping member consists of a flexible metallic lamina fixed at one end thereof to the gripper and freely oscillating at the other end. The same clamping member is also illustrated in EP-164 628.
  • EP-207 533 discloses grippers for shuttleless looms wherein the clamping member consists of a wire spring fixed at both ends to the gripper, devices being also provided for controlling the tension thereof.
  • said flexible element In order to ensure a sufficiently strong gripping action, said flexible element must therefore be "stiff" enough so as to exert a stress, due to its deformation, sufficient for safely retaining the weft yarn. Moreover, it should not undergo an excessive deformation during the closing of the gripper, so as to avoid bearing on the rigid body of the gripper from which it projects, because it would of course loose, in that event, any kind of flexibility, to produce again the same operation mode of the previously known rigid grippers.
  • the action of the flexible elastic gripping elements of the known type is in fact still too "stiff" for safely retaining the whole yarn section.
  • the gripper carries to the opposite side of the fabric being woven only a few filaments of parallel-filament yarns, or a longitudinal portion of the flat-section yarn, which breaks along its axis.
  • the object of the present invention is hence to provide a drawing gripper which eliminates the last aforesaid drawbacks, so as to ensure a perfect retaining of the weft yarn over the whole clamping surface, even in the case of a synthetic yarn of the aforementioned kind.
  • a drawing gripper for shuttleless looms - of the type comprising, on one hand, a fixed gripping hook, having a first metallic clamping surface and, on the other hand, a wedge fixedly connected to a movable slider and having a second metallic clamping surface, this latter being apt to cooperate with said first surface in order to clamp and retain the weft yarn - characterized in that, one of said clamping surfaces consists of a flexible metallic lamina whose clamping zone bears onto an elastic pad.
  • the drawing gripper consists, in a known way, of an elongated body 1 (not wholly shown in the drawings), which terminates with a sharpened end, shaped as a gripping hook 2, having a first metallic clamping surface.
  • a slider 4 is mounted on the body 1, sliding along the longitudinal axis of the gripper and bearing on its end 4a a wedge provided with a second clamping surface. This latter being apt to cooperate with the first one clamping surface in order to clamp the weft yarn (not shown), to allow its drawing.
  • the wedge forming said second clamping surface consists of a metallic lamina 5 and a pad 6 onto which said lamina bears.
  • the lamina 5 - one end 5a thereof is fixed, to the slider 4, e.g. through a screw 7 or the like - has a undulated configuration, comprising however a flat part 8, which is apt to contact the clamping surface 3, fitting therewith.
  • the lamina 5 is provided with high elasticity and flexibility, to the extent that it is not able to clamp the weft yarn by itself, i.e. without the bearing action provided by the elastic pad 6.
  • the pad 6 is made of a gum-like material, such as "Vulcollan” or the like, and has a configuration comprising, as above mantioned, a flat part apt to support the flat part 8 of the lamina 5.
  • the material forming the pad 6 is sufficiently yielding to follow the movement of the lamina 5, without however allowing an excessive shape variation thereof.
  • the lamina 5 may be provided with a window or slit 9, apt to further increase the flexibility of the lamina.
  • the other end 5b of the lamina 5, opposed to the fixed end 5a, is bent at right angle and is guided, freely sliding, within a guide hole provided at the end 4a of the slider 4. In such a way, said end 5b, together with the flat part 8, are elastically yielding in a direction perpendicular to the clamping surfaces 3 and 8.
  • the undulated shape of the lamina 5 is such as to form, in correspondence of the tip 2a of the hook 2, a lead-in zone 10 apt to allow an easy insertion of the weft yarn between the clamping surfaces.
  • the wedge of the slider 4 according to the present invention comprising the pad 6 and the lamina 5 has therefore a large clamping surface - flexible and yielding longitudinally as well as perpendicularly to the axis of the gripper - apt to ensure a perfect retaining action of the yarn against the clamping surface 3 of the hook.
  • the gripper of the present invention is then apt to ensure, on one hand, an easier and surer gripping of the weft yarn through the lead-in zone 10 and, on the other hand, a perfect retaining action of said weft yarn between the clamping surfaces 3 and 8.

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

Claims (7)

  1. Mitnehmergreifer für schützenlose Webmaschinen - von der Art mit, einerseits, einem ortsfesten Greiferhaken (2) mit einer ersten metallischen Klemmfläche (3) und, andererseits, einem Keil, der fest mit einem beweglichen Gleitelement verbunden ist und eine zweite metallische Klemmfläche (8) aufweist, die dazu eingerichtet ist, mit der ersten Fläche zusammenzuwirken, um den Schußfaden zu klemmen und rückzuhalten, wobei eine der Klemmflächen aus einem flexiblen metallischen Blatt (5) besteht - , dadurch gekennzeichnet, daß der Klemmbereich (8) des flexiblen Blatts (5) auf einem elastischen Kissen (6) ruht.
  2. Mitnehmergreifer nach Anspruch 1, wobei das metallische Blatt (5) ein zur Gewichtverminderung dienendes Fenster oder einen Schlitz (9) in Übereinstimmung mit seinem Klemmbereich (8) aufweist.
  3. Mitnehmergreifer nach Anspruch 1, dadurch gekennzeichnet, daß das Kissen (6) ein Gummikissen ist.
  4. Mitnehmergreifer nach einem der vorangehenden Ansprüche, wobei das metallische Blatt (5) die zweite Klemmfläche (8) bildet.
  5. Mitnehmergreifer nach Anspruch 4, wobei das metallische Blatt (5) eine im wesentlichen nicht gewellte Ausbildung mit wenigstens einem flachen Abschnitt (8) hat, der die zweite Klemmfläche (8) bildet, gekrümmt zu wenigstens einem gebogenen Teil, der mit dem ortsfesten Haken (2) einen Einführungsbereich (10) zum Führen des Fadens begrenzt.
  6. Mitnehmergreifer nach Anspruch 5, wobei das metallische Blatt (5) durch ein Ende (5a) mit dem Gleitelement (4), das den Klemmkeil trägt, befestigt ist.
  7. Mitnehmergreifer nach Anspruch 6, wobei das andere Ende (5b) des metallischen Blatts (5) frei schwingend ist und in ein Loch (4a) an dem Ende des Gleitelements, das den Klemmkeil trägt, geführt ist.
EP92104815A 1991-03-22 1992-03-19 Mitnehmergreifer für schützenlose Webmaschinen, insbesondere zum Weben von synthetischen Fäden Expired - Lifetime EP0504899B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI910785A IT1245580B (it) 1991-03-22 1991-03-22 Pinza traente per telai di tessitura senza navetta, in particolare per la lavorazione di filato sintetico
ITMI910785 1991-03-22

Publications (2)

Publication Number Publication Date
EP0504899A1 EP0504899A1 (de) 1992-09-23
EP0504899B1 true EP0504899B1 (de) 1996-06-12

Family

ID=11359207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92104815A Expired - Lifetime EP0504899B1 (de) 1991-03-22 1992-03-19 Mitnehmergreifer für schützenlose Webmaschinen, insbesondere zum Weben von synthetischen Fäden

Country Status (5)

Country Link
EP (1) EP0504899B1 (de)
AT (1) ATE139269T1 (de)
DE (1) DE69211392T2 (de)
ES (1) ES2089269T3 (de)
IT (1) IT1245580B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1274589B (it) * 1994-08-05 1997-07-18 Nuovo Pignone Spa Sistema perfezionato di presa e serraggio della trama nella pinza di trazione di un telaio tessile
IT1283380B1 (it) * 1996-07-31 1998-04-17 Vamatex Nuova Spa Pinza traente per telai di tessitura.
CH692457A5 (it) * 1997-07-29 2002-06-28 Gividi Italia Spa Pinza traente per telai a tessere a lance ed impiego della pinza.
IT201700121914A1 (it) * 2017-10-26 2019-04-26 Santex Rimar Group S R L Gruppo di presa per l’inserzione del filo di trama in telai senza navetta

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH633589A5 (de) * 1978-11-15 1982-12-15 Saurer Ag Adolph Fadenklemme.
IT1167266B (it) * 1983-10-07 1987-05-13 Vamatex Spa Organo di ritegno della trama in pinze portatrama per telai di tessitura
IT1196137B (it) * 1984-06-07 1988-11-10 Vamatex Spa Coppia di pinze portatrama per telai di tessitura senza navette
BE902141A (nl) * 1985-04-09 1985-10-09 Picanol Nv Verbeterde grijpers voor weefmachines.

Also Published As

Publication number Publication date
ES2089269T3 (es) 1996-10-01
EP0504899A1 (de) 1992-09-23
ATE139269T1 (de) 1996-06-15
ITMI910785A0 (it) 1991-03-22
IT1245580B (it) 1994-09-29
DE69211392T2 (de) 1996-10-31
ITMI910785A1 (it) 1992-09-22
DE69211392D1 (de) 1996-07-18

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