EP0623694A1 - Gripper strap for weaving looms - Google Patents

Gripper strap for weaving looms Download PDF

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Publication number
EP0623694A1
EP0623694A1 EP94106840A EP94106840A EP0623694A1 EP 0623694 A1 EP0623694 A1 EP 0623694A1 EP 94106840 A EP94106840 A EP 94106840A EP 94106840 A EP94106840 A EP 94106840A EP 0623694 A1 EP0623694 A1 EP 0623694A1
Authority
EP
European Patent Office
Prior art keywords
strap
gripper
rest
end part
parts
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.)
Granted
Application number
EP94106840A
Other languages
German (de)
French (fr)
Other versions
EP0623694B2 (en
EP0623694B1 (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(A1) "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 concerns a gripper strap, of the type used to move the weft feeding grippers along the shed of shuttleless looms.
  • the present invention supplies a gripper strap 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.
  • said end element of the strap according to the invention is engaged with the rest of the strap by a free fit and is removably 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 seat 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 gear wheels provided for its reciprocating motion.
  • a plurality of screws 7 are 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 seats 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 heads of the screws 7.
  • the strap end 1 can be easily replaced when starting to get worn: in this case, it is sufficient to loosen 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.
  • connection between the strap end 1 and the rest of the strap 2 could be obtained - rather than through a free fit, as in the embodiment shown - through a suitably articulated joint (not shown).
  • the strap turns out to be formed by a portion moving into the guide elements and carrying the gripper (strap end 1) and by a portion acting as thrust and draw element (rest of the strap 2), said joint transmitting only the compressive and tractive forces along the direction of motion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Woven Fabrics (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Package Frames And Binding Bands (AREA)
  • Knitting Of Fabric (AREA)

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.

Description

  • The present invention concerns a gripper strap, of the type used to move the weft feeding grippers along the shed of shuttleless looms.
  • It is known to the skilled in the art that the drawback present in gripper straps of looms is that the end part of said straps, carrying the gripper, is subject to considerable wear. In fact, the transverse inertial forces due 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 main 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 plate or head at the end of the strap carrying the gripper, as in BE-A-681542 or in DE-A--2400166 wherein said head or plate are firmly fixed to the strap end. When adopting this principle, the strap is formed in a single piece, with a very stiff end allowing to limit deformation and distribute the load.
  • However this solution is, on one hand, not suitable for every type of loom and, on the other hand, it is not apt to guarantee satisfactory results when the strap guiding elements are not perfectly aligned, since a misaligned element produces impacts and bounces of the strap end.
  • It should also be noted that the construction - adopted so far - of gripper straps formed in one piece with their end part (possibly stiffened) carrying the gripper, has the drawback of not allowing a rational choice of the materials used to produce either said end 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 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.
  • Preferably, said end element of the strap according to the invention is engaged with the rest of the strap by a free fit and is removably fixed thereto by way of the gripper and together therewith.
  • The invention is now described in further detail, by mere way of example, with reference to a preferred embodiment thereof, illustrated on the accompanying drawings, in which:
    • Fig. 1 is a view 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 weft 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 seat 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 gear wheels provided for its reciprocating motion.
  • A plurality of screws 7 (figs. 6 and 7) are 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 seats 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 heads of the screws 7.
  • It is evident that the strap end 1 can be easily replaced when starting to get worn: in this case, it is sufficient to loosen 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.
  • The connection between the strap end 1 and the rest of the strap 2 could be obtained - rather than through a free fit, as in the embodiment shown - through a suitably articulated joint (not shown).
  • 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 gearwheel for its motion).
  • Whereas, if an articulated joint is provided between the strap end 1 and the rest of the strap 2, the strap turns out to be formed by a portion moving into the guide elements and carrying the gripper (strap end 1) and by a portion acting as thrust and draw element (rest of the strap 2), said joint transmitting only the compressive and tractive forces along the direction of motion.
  • The possibility, offered by the invention, to disjoin and easily replace the 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 the 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).
  • According to the invention it is also possible, if wanted, to:
    • interpose an elastic element (not shown in the embodiment illustrated) between the end part and the rest of the strap, so as to isolate any vibrations between the parts;
    • form the strap end with an initial flexible portion, so as to limit and dampen any impacts against possibly misaligned guide elements.
  • It should be noted furthermore that, especially in the described embodiment with a fixed joint between the two strap parts (1 and 2), the engagement between the same 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 (5)

  1. Gripper strap to move the weft feeding grippers along the shed of shuttleless looms, characterized in that it is formed in two distinct parts, 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.
  2. Gripper strap as in claim 1), wherein said distinct, interchangeable, end element of the strap is made of a different material from the rest of the strap.
  3. Gripper strap as in claims 1) and 2), wherein said end element of the strap is engaged with the rest of the strap by a free fit and is removably fixed thereto by way of the gripper and together therewith.
  4. Gripper strap as in claims 1) and 2), wherein said end element of the strap is connected to the rest of the strap through an articulated joint.
  5. Gripper strap as in claims 1) to 4), wherein an elastic vibration damping element is interposed between the end part of the strap and the rest of the strap.
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
ITMI930894A IT1272408B (en) 1993-05-05 1993-05-05 GRIPPER TAPE FOR WEAVING FRAMES
ITMI930894 1993-05-05

Publications (3)

Publication Number Publication Date
EP0623694A1 true EP0623694A1 (en) 1994-11-09
EP0623694B1 EP0623694B1 (en) 1997-03-26
EP0623694B2 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 (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715009B1 (en) * 1994-11-30 2000-02-09 NUOVA VAMATEX S.p.A. Means to guide the motion of a pair of weft grippers along the shed of looms
WO2000026454A1 (en) * 1998-10-29 2000-05-11 Picanol N.V. Gripper band for a gripper in a gripper loom and gripper loom
KR100441332B1 (en) * 1996-02-27 2004-11-10 누보 피그노네 에스피에이 Tape head for gripper loom and manufacturing method
EP1876273A1 (en) * 2006-07-07 2008-01-09 SCHÖNHERR Textilmaschinenbau GmbH Rapier, method of manufacturing same, device for inserting weft yarns comprising such a rapier and loom equipped with such a device
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.
CN103069064A (en) * 2011-07-21 2013-04-24 斯密特纺织股份公司 Single-gripper weaving loom

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE681542A (en) * 1965-04-06 1966-10-31
DE2400166A1 (en) * 1973-12-04 1975-06-05 Rueti Ag Maschf Weaving loom gripping carrying tape - reducing servicing period by attaching gripper releasably to tape
FR2270356A1 (en) * 1972-03-04 1975-12-05 Desveus Duran Magin
FR2642093A1 (en) * 1989-01-20 1990-07-27 Nuovo Pignone Spa System for anchoring a gripper support on the conveyor belt of a loom

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE658330A (en) † 1964-01-17 1900-01-01
BE1004305A3 (en) † 1989-07-06 1992-10-27 Picanol Nv Rapier WITH LANCE GUIDANCE.
DE59309766D1 (en) † 1992-07-03 1999-10-14 Picanol Nv Rapier weaving machine
BE1007003A3 (en) † 1993-04-15 1995-02-14 Picanol Nv A weaving machine provided with LANS AND GUIDANCE RESOURCES.
JPH0660482A (en) † 1992-08-11 1994-03-04 Pioneer Electron Corp Tape feeding speed controller for tape player

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE681542A (en) * 1965-04-06 1966-10-31
FR2270356A1 (en) * 1972-03-04 1975-12-05 Desveus Duran Magin
DE2400166A1 (en) * 1973-12-04 1975-06-05 Rueti Ag Maschf Weaving loom gripping carrying tape - reducing servicing period by attaching gripper releasably to tape
FR2642093A1 (en) * 1989-01-20 1990-07-27 Nuovo Pignone Spa System for anchoring a gripper support on the conveyor belt of a loom

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715009B1 (en) * 1994-11-30 2000-02-09 NUOVA VAMATEX S.p.A. Means to guide the motion of a pair of weft grippers along the shed of looms
KR100441332B1 (en) * 1996-02-27 2004-11-10 누보 피그노네 에스피에이 Tape head for gripper loom and manufacturing method
WO2000026454A1 (en) * 1998-10-29 2000-05-11 Picanol N.V. Gripper band for a gripper in a gripper loom and gripper loom
BE1013013A3 (en) * 1998-10-29 2001-07-03 Picanol Nv GRAB STRAP FOR A rapier.
EP1876273A1 (en) * 2006-07-07 2008-01-09 SCHÖNHERR Textilmaschinenbau GmbH Rapier, method of manufacturing same, device for inserting weft yarns comprising such a rapier and loom equipped with such a device
FR2903425A1 (en) * 2006-07-07 2008-01-11 Schonherr Textilmaschb Gmbh LANCE, ITS MANUFACTURING METHOD, INSERTION DEVICE FOR FRAME WIRES COMPRISING SUCH A LANCE, AND A WEAVING MACHINE COMPRISING SUCH A DEVICE
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.
WO2011134953A3 (en) * 2010-04-29 2012-08-16 Picanol Rapier and gripper weaving machine
CN103069064A (en) * 2011-07-21 2013-04-24 斯密特纺织股份公司 Single-gripper weaving loom

Also Published As

Publication number Publication date
ITMI930894A0 (en) 1993-05-05
SI0623694T1 (en) 1997-10-31
DE69402236D1 (en) 1997-04-30
ES2099987T5 (en) 2001-09-01
ES2099987T3 (en) 1997-06-01
EP0623694B2 (en) 2001-05-02
DE69402236T2 (en) 1997-07-17
GR3023702T3 (en) 1997-09-30
ATE150807T1 (en) 1997-04-15
IT1272408B (en) 1997-06-23
DE69402236T3 (en) 2001-10-25
EP0623694B1 (en) 1997-03-26
DK0623694T3 (en) 1997-08-25
ITMI930894A1 (en) 1994-11-05

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