EP0623694B2 - Gripper strap for weaving looms - Google Patents

Gripper strap for weaving looms Download PDF

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Publication number
EP0623694B2
EP0623694B2 EP94106840A EP94106840A EP0623694B2 EP 0623694 B2 EP0623694 B2 EP 0623694B2 EP 94106840 A EP94106840 A EP 94106840A EP 94106840 A EP94106840 A EP 94106840A EP 0623694 B2 EP0623694 B2 EP 0623694B2
Authority
EP
European Patent Office
Prior art keywords
strap
gripper
rest
parts
end part
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
EP94106840A
Other languages
German (de)
French (fr)
Other versions
EP0623694B1 (en
EP0623694A1 (en
Inventor
Guiseppe Casarotto
Palmiro Terzi
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.)
NUOVA VAMATEX SpA
Promatech SpA
Original Assignee
NUOVA VAMATEX SpA
Vamatex Nuova 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11366015&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0623694(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by NUOVA VAMATEX SpA, Vamatex Nuova SpA filed Critical NUOVA VAMATEX SpA
Priority to SI9430050T priority Critical patent/SI0623694T1/en
Publication of EP0623694A1 publication Critical patent/EP0623694A1/en
Application granted granted Critical
Publication of EP0623694B1 publication Critical patent/EP0623694B1/en
Publication of EP0623694B2 publication Critical patent/EP0623694B2/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
    • D03D47/12—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

Definitions

  • the present invention concerne a gripper strap, of the type used to move the weft fooding grippers along the shod of shuttleless looms.
  • the present invention supplies a gripper strap according to the claim.
  • Said end element of the strap according to the invention is engaged with the rest of the strap by a free fit and is romovably fixed thereto by way of the gripper and together therewith.
  • the end 1 of the strap according to the invention - shaped so as to allow mounting thereon the front part of a weft feeding gripper - is separate from the rest of the strap 2.
  • Said strap end 1 is provided with a seat 3, into which is meant to fit the profiled end section 4 of the rest of the strap 2.
  • said section 4 has a shape mating with that of the seal 3, with corresponding semicircular ends 4A and 3A respectively.
  • the strap end 1 is made of stiff and highly wearproof material and is thus apt to move efficiently and for a long time, without creating any problems, into the elements guiding it along the shed.
  • the remaining part of the strap 2 is made of highly flexible material, allowing it to be deformed to the extent required for its winding around the goar wheels provided for its reciprocating motion.
  • a plurality of screws 7 (figs. 6 and 7) arc provided to fix the strap end 1 to the rest of the strap 2, when these two parts are reciprocally engaged by a free fit as shown in fig. 2, said screws crossing holes and/or corresponding notches, 5 and 6 respectively, formed in the two strap parts (fig. 1).
  • the illustrated embodiment provides for through holes and notches 5 and 6, and the screws 7 screw simultaneously into threaded seate of the gripper 8, whereby the fixing between the two freely engaged strap parts 1 and 2 is obtained by way of the gripper itself.
  • the holes 5 of the strap end 1 are also provided with countersinks 9 to house the honds of the screws 7.
  • the strap end 1 can be easily replaced when starting to gel worn: in this case, it is sufficient to looson the screws 7, to remove the gripper 8 from the strap parts 1, 2, and to then connect again the gripper to the strap formed by a new end part 1 and by the rest of the strap 2 already in use.
  • the operation is simple and very quick, and it allows to dispose, at a reduced cost, of a practically new strap.
  • the life of a gripper strap according to the invention is in any case longer than that of the conventional straps, even without replacing the strap end 1, due to the advantages - as far as flexibility and wear - guaranteed by the rational choice of the materials used for the two parts 1 and 2 forming the strap.

Abstract

A gripper strap, to move the weft feeding grippers along the shed of shuttleless looms, is formed in two distinct parts made of different materials, the end part of said strap where the gripper is mounted consisting of an interchangeable element, separate from the rest of the strap and removably connected thereto. <IMAGE>

Description

  • The present invention concerne a gripper strap, of the type used to move the weft fooding grippers along the shod of shuttleless looms.
  • It is known to the skilled in the art that the drawback present in grippor straps of looms is that the end part of said straps, carrying the gripper, is subject to considerable wont. In fact, tho transverse inertial forces duo to the misaligned position of the gripper barycenter give rise to a high-friction contact between the end part of the strap, where the gripper is mounted, and the elements which guide the strap along the shed on the loom sley. On the other hand, such elements form a discontinuous guide and develop an abrasive action on said strap end. The mein problem is to thus limit the wear of the strap end, so as to avoid the sure consequence of an irregular working, after a short period of use - due to excessive slack between the strap and the guide elements - and, therefore, the frequent replacement of the whole strap.
  • An attempt has already been made to solve this problem by interposing a wearproof element between the end of the strap and the guide elements, that is, by applying a stiffening and/or guiding plato or head at the end of the strap carrying the gripper, as in BE-A-681542 or in DE-A-2400166 wherein said hoad or plate are firmly fixed to the strap end. When adopting this principle, the strap is formed in a single place, with a very still end allowing to limit deformation and distribute the load.
  • A substantially similar attempt is reported in FR-A-2270356 where a plate is fixed to the tapered end of the strap, considerably projecting with respect to the same.
  • However this solution is, on one hand, not suitable for every type of loom and, on the other hand, it is not apl to guarantee satisfactory results when the strap guiding elements are not perfectly aligned, since a misaligned element produces impacts and bounees of the strap end.
  • It should also be noted that the construction-adopted so far - of gripper straps formed in one place with their end part (possibly stiffened) carrying the gripper, has the drawback of not allowing a rational cholco of the materials used to produce either said and part, or the remaining part of the strap: thus, for example, the technology based on the use of a flexible composite material, quite suitable for producing most of the gripper strap, often does not give satisfactory results for what concerns its end portion carrying the gripper, which portion is subject - as seen - to severe wear in contact with the guide elements.
  • In order to solve the aforementioned problem, the present invention supplies a gripper strap according to the claim.
  • Said end element of the strap according to the invention is engaged with the rest of the strap by a free fit and is romovably fixed thereto by way of the gripper and together therewith.
  • The invention is now described in further detail, by more way of example. With reference to a preferred embodiment thereof, illustrated on the accompanying drawings, in which:
  • Fig. 1 is a vlow of the strap in two parts, according to the invention, with the strap end - corresponding to the part carrying the gripper - shown separate from the rest of the strap;
  • Fig, 2 is a view of the strap of fig. 1, but with said end part engaged with the rest of the strap.
  • Figs. 3 to 5 are three cross-section views of the strap, along the lines III-III, IV-IV and V-V of Fig. 2;
  • Fig. 6 shows the strap of the invention, illustrated in figs. 1 to 5, with a well gripper mounted thereon; and
  • Fig. 7 is a cross-section view of the strap, on a very enlarged scale, along the line VII-VII of fig. 6.
  • As can be seen from Fig. 1, the end 1 of the strap according to the invention - shaped so as to allow mounting thereon the front part of a weft feeding gripper - is separate from the rest of the strap 2.
  • Said strap end 1 is provided with a seat 3, into which is meant to fit the profiled end section 4 of the rest of the strap 2. As clearly shown in figs. 1 and 2, said section 4 has a shape mating with that of the seal 3, with corresponding semicircular ends 4A and 3A respectively.
  • The strap end 1 is made of stiff and highly wearproof material and is thus apt to move efficiently and for a long time, without creating any problems, into the elements guiding it along the shed. Viceversa, the remaining part of the strap 2 is made of highly flexible material, allowing it to be deformed to the extent required for its winding around the goar wheels provided for its reciprocating motion.
  • A plurality of screws 7 (figs. 6 and 7) arc provided to fix the strap end 1 to the rest of the strap 2, when these two parts are reciprocally engaged by a free fit as shown in fig. 2, said screws crossing holes and/or corresponding notches, 5 and 6 respectively, formed in the two strap parts (fig. 1). The illustrated embodiment provides for through holes and notches 5 and 6, and the screws 7 screw simultaneously into threaded seate of the gripper 8, whereby the fixing between the two freely engaged strap parts 1 and 2 is obtained by way of the gripper itself. As clearly shown in fig. 3, the holes 5 of the strap end 1 are also provided with countersinks 9 to house the honds of the screws 7.
  • It is evident that the strap end 1 can be easily replaced when starting to gel worn: in this case, it is sufficient to looson the screws 7, to remove the gripper 8 from the strap parts 1, 2, and to then connect again the gripper to the strap formed by a new end part 1 and by the rest of the strap 2 already in use. The operation is simple and very quick, and it allows to dispose, at a reduced cost, of a practically new strap.
  • The life of a gripper strap according to the invention is in any case longer than that of the conventional straps, even without replacing the strap end 1, due to the advantages - as far as flexibility and wear - guaranteed by the rational choice of the materials used for the two parts 1 and 2 forming the strap.
  • In the first case, by fixing of the gripper, a fixed joint is established between the two parts 1 and 2, and the strap practically behaves as if it were formed in one piece, with the stiff end - carrying the gripper - as long as possible (up to the flexible portion winding around the nearwheel for its motion).
  • The possibility, ollered by the invention, to diejoin and easily replace tho strap end - corresponding to the part carrying the gripper-from the rest of the strap itself, as specified heretofore, allows:
    • to limit the number of replacements of the whole strap by interchanging once, or more frequently, only the end part thereof,
    • to operate an optimal choice of tho material and constructive technology adopted for the two distinct parts of the strap;
    • to distinguish the guiding function of the gripper carrying end, from the thrusting and drawing function of the rest of the strap (when an articulated joint is provided to connect the end part to the rest of the strap).
  • It should be noted furthermore that the engagement between the two strap parts 1 and 2 takes place in correspondence of an area protected by the gripper, whereby the yarns of the warp chain are not apt to interfere therewith.

Claims (1)

  1. Gripper strap to move the weft feeding grippers (8) along the shed of shuttleless looms, formed in two distinct parts (1, 2), the end part (1) of said strap where the gripper (8) is mounted consisting of an interchangeable element, separate and made of a different material from the rest (2) of the strap and removably connected thereto, said end part (1) of the strap being provided with a profiled seat (3), into which fits a profiled end section (4) of the rest of the strap (2), said end section (4) of the strap and the seat (3) of the strap mating one another, and said end part (1) of the strap and the rest (2) of the strap being removably fixed to each other by means of the gripper (8) and to the gripper itself, wherein said end/part (1) of the strap is engaged with the rest of the strap by a free fit, characterised in that said profiled seat (3) and said profiled end section (4) have semicircular ends (3A and 4A, respectively), that said end part (1) is fixed to the rest of the strap (2) by a plurality of screws (7) each crossing holes and/or corresponding notches (5, 6) formed in the two strap parts and simultaneously being screwed into threaded seats of the gripper (8) whereby the fixing between the two freely engaged strap parts (1, 2) is obtained by way of the gripper itself ; and that the two strap parts (1, 2) are engaged with each other in an area protected by the gripper.
EP94106840A 1993-05-05 1994-05-02 Gripper strap for weaving looms Expired - Lifetime EP0623694B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9430050T SI0623694T1 (en) 1993-05-05 1994-05-02 Gripper strap for weaving looms

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI930894 1993-05-05
ITMI930894A IT1272408B (en) 1993-05-05 1993-05-05 GRIPPER TAPE FOR WEAVING FRAMES

Publications (3)

Publication Number Publication Date
EP0623694A1 EP0623694A1 (en) 1994-11-09
EP0623694B1 EP0623694B1 (en) 1997-03-26
EP0623694B2 true EP0623694B2 (en) 2001-05-02

Family

ID=11366015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94106840A Expired - Lifetime EP0623694B2 (en) 1993-05-05 1994-05-02 Gripper strap for weaving looms

Country Status (8)

Country Link
EP (1) EP0623694B2 (en)
AT (1) ATE150807T1 (en)
DE (1) DE69402236T3 (en)
DK (1) DK0623694T3 (en)
ES (1) ES2099987T5 (en)
GR (1) GR3023702T3 (en)
IT (1) IT1272408B (en)
SI (1) SI0623694T1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101100782B (en) * 2006-07-07 2011-04-27 圣豪纺织机械有限公司 Rapier, method of manufacturing same, device for inserting weft yarns comprising such a rapier and loom equipped with such a device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1271130B (en) * 1994-11-30 1997-05-26 Vamatex Nuova Spa MEANS TO GUIDE THE MOTORCYCLE OF A PAIR OF CLAMPS INSIDE THE PITCH OF WEAVING FRAMES
IT1290837B1 (en) * 1996-02-27 1998-12-14 Nuovo Pignone Spa TAPE HEAD PERFECTED FOR TEXTILE CLAMPS AND PROCEDURE FOR ITS REALIZATION
BE1013013A3 (en) * 1998-10-29 2001-07-03 Picanol Nv GRAB STRAP FOR A rapier.
BE1017654A5 (en) * 2007-06-21 2009-03-03 Picanol Nv BEARING ELEMENT FOR A GRIPPER OF A GRIPPER WEAVING MACHINE.
BE1019316A3 (en) * 2010-04-29 2012-06-05 Picanol Nv LANS AND GRAB WEAVER.
ITPD20110249A1 (en) * 2011-07-21 2013-01-22 Smit Textile S P A TEXTILE FRAME WITH SINGLE CALIPER

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299911A (en) † 1964-01-17 1967-01-24 Dewas Raymond Weaving machine with uninterrupted weft supply
US5183084A (en) † 1989-07-06 1993-02-02 Picanol N.V., Naamloze Vennootschap Rapier guide with two series of guide elements
EP0576854A1 (en) † 1992-07-03 1994-01-05 Picanol N.V. Gripper loom
JPH0660482A (en) † 1992-08-11 1994-03-04 Pioneer Electron Corp Tape feeding speed controller for tape player
EP0620303A1 (en) † 1993-04-15 1994-10-19 Picanol N.V. Gripper loom

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES311799A1 (en) * 1965-04-06 1965-07-01 Desveus Duran Magin Looms with stationary weft supply
ES400984A1 (en) * 1972-03-04 1975-02-01 Desveus Duran Improvements in the construction of weaving machines without lanzadera. (Machine-translation by Google Translate, not legally binding)
CH572115A5 (en) * 1973-12-04 1976-01-30 Rueti Ag Maschf
IT1228493B (en) * 1989-01-20 1991-06-19 Nuovo Pignone Spa IMPROVEMENTS IN THE ANCHORING SYSTEM OF THE GRIPPER SUPPORT TO THE CONVEYOR BELT IN A TEXTILE FRAME.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299911A (en) † 1964-01-17 1967-01-24 Dewas Raymond Weaving machine with uninterrupted weft supply
US5183084A (en) † 1989-07-06 1993-02-02 Picanol N.V., Naamloze Vennootschap Rapier guide with two series of guide elements
EP0576854A1 (en) † 1992-07-03 1994-01-05 Picanol N.V. Gripper loom
JPH0660482A (en) † 1992-08-11 1994-03-04 Pioneer Electron Corp Tape feeding speed controller for tape player
EP0620303A1 (en) † 1993-04-15 1994-10-19 Picanol N.V. Gripper loom

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101100782B (en) * 2006-07-07 2011-04-27 圣豪纺织机械有限公司 Rapier, method of manufacturing same, device for inserting weft yarns comprising such a rapier and loom equipped with such a device

Also Published As

Publication number Publication date
ES2099987T3 (en) 1997-06-01
ES2099987T5 (en) 2001-09-01
DK0623694T3 (en) 1997-08-25
EP0623694B1 (en) 1997-03-26
GR3023702T3 (en) 1997-09-30
ITMI930894A0 (en) 1993-05-05
ATE150807T1 (en) 1997-04-15
DE69402236T2 (en) 1997-07-17
DE69402236T3 (en) 2001-10-25
IT1272408B (en) 1997-06-23
EP0623694A1 (en) 1994-11-09
ITMI930894A1 (en) 1994-11-05
SI0623694T1 (en) 1997-10-31
DE69402236D1 (en) 1997-04-30

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