EP0709505B1 - Guide track for gripper straps in looms - Google Patents

Guide track for gripper straps in looms Download PDF

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Publication number
EP0709505B1
EP0709505B1 EP95116891A EP95116891A EP0709505B1 EP 0709505 B1 EP0709505 B1 EP 0709505B1 EP 95116891 A EP95116891 A EP 95116891A EP 95116891 A EP95116891 A EP 95116891A EP 0709505 B1 EP0709505 B1 EP 0709505B1
Authority
EP
European Patent Office
Prior art keywords
guide
straps
guide track
gripper straps
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
EP95116891A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0709505A1 (en
Inventor
Giuliano Cortinovis
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 EP0709505A1 publication Critical patent/EP0709505A1/en
Application granted granted Critical
Publication of EP0709505B1 publication Critical patent/EP0709505B1/en
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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • 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
    • D03D47/271—Rapiers
    • D03D47/272—Rapier bands

Definitions

  • the present invention concerns a guide track for straps in gripper looms, namely a track allowing to guide the two flexible straps carrying the grippers and controlling their movement during their fast back and forth motion inside the shed.
  • the lower surface of the straps was bearing onto a sliding plane specially formed on the sley, sliding over the lower warp yarns, and the straps were laterally guided by hooks which clamped part of their upper and sometimes lower surface and all their lateral surface.
  • the strap was guided by the actual reed, obviously only on one of its two sides. Examples of tracks of this type are described in US-A-4,076,053. This type of "bearing" tracks was subsequently abandoned, as the stresses which were imparted on the warp yarns - especially when these are positioned irregularly or not perfectly tensioned - and the consequent breakages thereof, had become quite unacceptable, taking also into account the subsequent weaving speed increases.
  • a third drawback finally lies in the fact that the strap is guided also in correspondence of one of its edges, with consequent wear and roughening thereof, which should instead be avoided in order to prevent any warp yarns from getting eventually entangled in the strap during the shed closing step; this practically never leads to their breakage, but is apt to determine a misalignment of the warp yarns and thus favour the subsequent catching thereof into the loop of the hooks.
  • the object of the present invention is therefore to supply a guide track for gripper straps of the "floating" type, apt to overcome all the aforementioned drawbacks, which allows to work on looms at a very high speed and with an extremely reduced number of warp yarn breakages.
  • a guide track for gripper straps in looms of the type consisting of a plurality of mutually spaced support and guide elements fixed to the loom sley, characterized in that it comprises lower and upper support and guide elements, shaped as upturned brackets and, respectively, downturned brackets and alternately positioned along the track, said elements being apt to slidably cooperate with longitudinal notches provided on the opposed surfaces of the gripper straps.
  • Figures 1, 2 and 4 clearly show the basic elements of the loom, in the shed zone, inside which there is actually mounted the guide track for gripper straps of the present invention.
  • Said elements consist of the sley A, the reed P fixed thereto, the warp yarns O which, while parting, form the shed F, the strap N, the gripper S, and finally the fabric T.
  • the guide track for gripper straps of the present invention is, as seen, of the "floating" type, namely formed of a plurality of support and guide elements apt to guide the straps without these last ones bearing onto the surface of the sley A.
  • the invention provides for lower support and guide elements 1i and upper support and guide elements 1s, the shape of which is illustrated in detail in figs. 1, 2 and 3. These figures clearly show the characteristic bracket shape - upturned and, respectively, down-turned - which characterizes said support and guide elements of the guide track for gripper straps according to the invention.
  • Each lower support and guide element 1i comprises a foot 2 for anchorage to the sley A, which vertically extends into a tip 3 from whose base an upturned bracket 4 projects cantilevered.
  • the upper part of the bracket 4 has dimensions such as to fit - with the required slack - into a lower notch of the straps N having a rectangular section and extending longitudinally throughout their length.
  • the bracket 4 slidably cooperates with the notch of the strap N through its top surface 4' and its lateral surfaces 4'', so as to support and guide the strap in the three corresponding directions perpendicular to said surfaces.
  • the element 1i is finally fixed to the sley A - and precisely onto an appropriate rail R provided therein - by means of a screw clamp M housed into a hole 5 of the foot 2; said hole 5 has a certain downward inclination in the direction of the rail R, for the purposes explained more clearly hereinafter.
  • the upper support and guide element 1s comprises a foot 6 for anchorage to the sley A, which vertically extends into a tip 7 - slightly longer than the tip 3 - from whose top a downturned bracket 8 projects cantilevered.
  • the lower part of the bracket 8 has dimensions such as to fit - with the required slack - into an upper notch of the straps N having a rectangular section and extending, like the previous lower notch, throughout the length of the straps.
  • the bracket 8 slidably cooperates with the corresponding notch of the strap N by way of its lower surface 8' and its lateral surfaces 8'', so as to support and guide the straps N in the three corresponding directions perpendicular to said surfaces.
  • the element 1s is also fixed to the aforecited rail R of the sley A by means of a screw clamp M housed into a hole 9 of the foot 6, which hole is also downwardly inclined like the hole 5 of the element 1i.
  • the lower and upper support and guide elements 1i and 1s are alternately positioned along the rail R - as clearly shown in fig. 4 - so as to form a steady and reliable guide for the straps N, with the considerable advantages described hereinafter.
  • the particular "open" configuration of the support and guide elements 1i and 1s, of the guide track for gripper straps according to the invention allows to carry out on said elements machining operations which could by no means be done on the support and guide elements of the known-type guide tracks; it is consequently possible to obtain an extremely more precise alignment and flatness of the strap guiding surfaces, so as to eliminate any vibrations of said straps and strongly reduce their wear.
  • These advantageous conditions hence allow to increase even further the speed of the loom, with no fear of harmful consequences on the straps.
  • Said machining operations consist in grinding both the guiding surfaces and the positioning surfaces of the support and guide elements 1i and 1s.
  • the guiding surfaces are the surfaces 4' and 4'' of the upturned bracket 4 and the surfaces 8' and 8'' of the downturned bracket 8; after grinding, said surfaces may eventually be lapped in order to obtain a perfect smoothing.
  • the positioning surfaces are the abutment surfaces of the feet 2 and 6, and precisely the surfaces 2', 2'' and 6', 6'', which are used to obtain a reproducible and constant positioning of said feet both in the machine tool, which provides to grind the aforecited guiding surfaces, and in the final positioning on the sley A.
  • the rail R formed from an extruded section, provides a specific bearing seat for the feet 2 and 6, consisting of the two surfaces R' and R'' onto which abut the surfaces 2', 6' and, respectively, 2'' and 6'' of the feet 2 and 6.
  • the special "open" configuration of the support and guide elements 1i and 1s, of the guide track for gripper straps according to the invention is apt to notably reduce the possibilities for a warp yarn O - not perfectly positioned or not properly tensioned - to be cut off by the straps during their movement through the support and guide elements.
  • all the surfaces of said elements apt to come in contact with the warp yarns have no sharp edges and are smoothly radiused.
  • both the tip 3 of the support and guide element 1i and the corresponding tip 7 of the support and guide element 1s comprise, on their top surface, an overturned V beveling, and are provided with parting projections 11 in the form of lateral protuberances which are perfectly radiused to the body of said elements.
  • the function of said bevelings and projections is to smoothly part the warp yarns O, during opening of the shed, so as to allow an easy insertion of said yarns between the single support and guide elements.
  • the beveled top surface of the tip 3 is particularly meant to separate the warp yarns O during closing of the shed and, with the help of the parting projections 11, to prevent said yarns from bearing onto the surface 4' and being consequently subject to breakage during sliding of the straps N.
  • the warp yarn breakages - determined by the movement of the straps through said elements - are reduced to an extremely low number, thereby fully reaching another object of the invention.
  • the cavities 12, which separate the brackets 4 and 8 from the respective tips 3 and 7, have transversal dimensions wider than the edge of the straps N housed therein. Said strap edges do not hence come in contact with any point of the support and guide elements and cannot thus get worn thereby; this allows to reach the third and last object of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Knitting Machines (AREA)
EP95116891A 1994-10-27 1995-10-26 Guide track for gripper straps in looms Expired - Lifetime EP0709505B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI942202 1994-10-27
ITMI942202A IT1270681B (it) 1994-10-27 1994-10-27 Pista guidanastri per telai di tessitura a pinze

Publications (2)

Publication Number Publication Date
EP0709505A1 EP0709505A1 (en) 1996-05-01
EP0709505B1 true EP0709505B1 (en) 1999-04-14

Family

ID=11369783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116891A Expired - Lifetime EP0709505B1 (en) 1994-10-27 1995-10-26 Guide track for gripper straps in looms

Country Status (4)

Country Link
EP (1) EP0709505B1 (es)
DE (1) DE69509036T2 (es)
ES (1) ES2131248T3 (es)
IT (1) IT1270681B (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1013013A3 (nl) * 1998-10-29 2001-07-03 Picanol Nv Grijperband voor een grijperweefmachine.
DE19838476A1 (de) * 1998-08-25 2000-03-09 Picanol Nv Greiferbandwebmaschine mit wenigstens einem Greiferband und Führungsmitteln
EP1123430B1 (de) * 1998-08-25 2007-06-13 Picanol N.V. Greiferwebmaschine mit wenigstens einem greiferband und führungsmitteln
IT1303652B1 (it) * 1998-12-23 2001-02-21 Somet Soc Mec Tessile Gancino per piste di guida dei nastri delle pinze in un telaio ditessitura a pinze

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1227684A (fr) * 1958-06-28 1960-08-22 Sulzer Ag Fabrication d'éléments de guidage des organes trameurs d'un métier
US3556163A (en) * 1968-12-06 1971-01-19 Sulzer Ag Guide for weft-picking means in a loom
US4076053A (en) 1975-07-10 1978-02-28 Albatex A.G. Means guiding the straps of the weft carrying grippers inside the shed
EP0199881B1 (de) * 1985-05-03 1988-01-20 GebràœDer Sulzer Aktiengesellschaft Schussfadeneintragsvorrichtung einer Greiferprojektil-Webmaschine
EP0199880A1 (de) * 1985-05-03 1986-11-05 GebràœDer Sulzer Aktiengesellschaft Schussfadeneintragsvorrichtung einer Webmaschine, insbesondere einer Greiferprojektil-Webmaschine
IT1198246B (it) 1986-12-23 1988-12-21 Vamatex Spa Mezzi per guidare il moto di una coppia di pinze portatrama all'interno del passo di telai di tessitura
IT1227335B (it) * 1988-09-08 1991-04-08 Vamatex Spa Mezzi per guidare il moto di pinze di alimentazione della trama all'interno del passo di telai di tessitura senza navette

Also Published As

Publication number Publication date
ES2131248T3 (es) 1999-07-16
DE69509036D1 (de) 1999-05-20
DE69509036T2 (de) 1999-08-19
ITMI942202A0 (it) 1994-10-27
IT1270681B (it) 1997-05-07
ITMI942202A1 (it) 1996-04-27
EP0709505A1 (en) 1996-05-01

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