EP1249527A1 - Bringergreifer mit progressiver Fadenklemmkraft für Webmaschinen - Google Patents

Bringergreifer mit progressiver Fadenklemmkraft für Webmaschinen Download PDF

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Publication number
EP1249527A1
EP1249527A1 EP20010830245 EP01830245A EP1249527A1 EP 1249527 A1 EP1249527 A1 EP 1249527A1 EP 20010830245 EP20010830245 EP 20010830245 EP 01830245 A EP01830245 A EP 01830245A EP 1249527 A1 EP1249527 A1 EP 1249527A1
Authority
EP
European Patent Office
Prior art keywords
plate
gripper
weft
weft yarn
plates
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.)
Withdrawn
Application number
EP20010830245
Other languages
English (en)
French (fr)
Inventor
Roberto Lebbolo
Silvano Testa
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
Promatech 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 Promatech SpA filed Critical Promatech SpA
Priority to EP20010830245 priority Critical patent/EP1249527A1/de
Publication of EP1249527A1 publication Critical patent/EP1249527A1/de
Priority to HK02108744.0A priority patent/HK1047144A1/zh
Withdrawn legal-status Critical Current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 present invention relates to an improved carrier gripper for weaving looms.
  • a carrier gripper with plates for gripping the weft yarn.
  • a carrier gripper in a weaving loom has the function of transferring a weft yarn from the point of insertion in the shed to the central zone of the loom where the exchange occurs with the drawing gripper which in the meantime has arrived on the opposite side.
  • the gripper must be able to grip firmly the weft yarn which lays in front of it between the fabric being formed and the weft feeding device, so as to convey it at high speed towards the centre of the loom; at the same time, however, the weft yarn must not remain trapped in the carrier gripper since the exchange with the drawing gripper must occur smoothly, otherwise there would be the risk of breakage of the weft yarn or the formation of an irregular weave.
  • a carrier gripper designed in accordance with the latest technology consists of an elongated box-shaped body which is fixed onto a gripper support belt to which the weft-gripping device is fixed.
  • the latter typically consists of a pair of shoes which are pressed against each other in a substantially horizontal plane and between which the weft yarn is intended to be engaged.
  • a carrier gripper has a box-shaped body 1 which is fixed to the end of a gripper support belt 2 and to which a bottom contact shoe 3 and a pressure plate 4 are attached. A weft yarn T is gripped between these two latter parts.
  • the pressure plate 4 is flexible while the contact shoe 3, which is usually arranged underneath, may also be substantially rigid.
  • the pressure plate 4 is kept pressed against the shoe 3 by a cam member 5, by means of which it is possible to adjust the rigidity thereof and hence the gripping action exerted on the weft yarn in co-operation with the bottom shoe.
  • the object of the present invention is therefore to provide a carrier gripper which also allows a certain tolerance with regard to the adjustment precision, as well as a gripper which automatically maintains suitable gripping of the weft for each operating step, at the same time ensuring that the weft remains gripped at a predefined point along the resilient plate, for example at a point where the acceleration produced by the movement of the grippers does not cause breakage thereof.
  • a carrier gripper comprises, in a manner known per se, a box-shaped body 101, which is fastened to a gripper support belt 102, on which a bottom contact shoe 103 is fixed. Moreover a flexible plate 104 co-operating with the bottom shoe 103 is provided.
  • the box-shaped body 101 is configured in such a way as to offer, in working conditions, two support points P 1 and P 2 for a weft yarn T which also passes through the gripping device (Figs. 4 and 5).
  • the bottom shoe has a front end curved downwards (Fig. 6B). It may be made of a rigid or resilient material. Preferably the front end is curved towards the box-shaped body of the gripper: this prevents any interference with the warp yarns at the moment of closing of the shed when the gripper is retracted.
  • the plate 104 rests on top of the bottom shoe and is pressed against it by cam means 105 (shown only schematically).
  • the resilient plate 104 is divided, in its front portion, into two half-plates 104a and 104b which are joined together integrally at the working zone (namely where the weft yarn is gripped).
  • the two half-plates 104a and 104b are curved, respectively upwards and downwards (with reference to the working condition). Moreover, the half-plate 104a is longer than the half-plate 104b and is also bent towards the box-shaped body along its end section.
  • the resilient plate 104 moreover, has a portion 104c with a knee bend which is able to engage with the drawing gripper, during the exchange operation, in order to slacken gripping of the weft yarn.
  • the basic adjustment of the gripping device is performed in a manner similar to that of the prior art, namely by adjusting the static engagement between the upper half-plate 104a and the bottom shoe 103.
  • the weft T is intended not only to be wedged between the half-plate 104a and the fixed shoe 103, but also to rest on the half-plate 104a, as clearly illustrated in Figs. 4A and 5A.
  • the tension present in the weft yarn T is transmitted partly onto the half-blade 104b which is thus loaded and pushed so that it flexes downwards. Since the half-blade 104a is joined integrally, at its base, with the half-blade 104b, the load applied onto the latter by the tension in the yarn T is distributed also partly onto the half-blade 104a which therefore acts with a greater pressure on the bottom shoe 103, clamping the weft yarn T more firmly and counteracting its tendency to be wedged more deeply inside the gripping device.
  • the cam system 105 may therefore be adjusted manually with a smaller degree of precision and so as to exert less pressure such that the weft yarn is retained "gently" in static conditions - preventing breakage at the moment of gripping or at the moment of exchange between the two grippers - whereas it is held firmly, in dynamic conditions, by the increased gripping pressure due to the greater tension in the yarn itself - typically preventing it from being extracted from the carrier gripper during insertion in the weft shed, or its point of contact on the gripping device from being displaced excessively.
  • FIG. 5A illustrates lowering of the half-plate 104b which results in an increase in the pressure on the weft yarn retained between the half-plate 104a and the fixed shoe 103.
  • a weft yarn extends between the fabric and the associated weft feeding device.
  • the carrier gripper according to the invention approaches the zone of interaction with the weft yarn and the latter is captured between the two points P 1 and P 2 of the box-shaped body, being inserted between the plate 104a and the fixed shoe 103 and remaining gripped there.
  • the weft yarn is cut on the fabric side (on the right-hand side in Figs. 4 and 5A) and drawn inside the shed.
  • the gradual increase in pressure of the half-plate on the bottom shoe also prevents the weft yarn from becoming excessively wedged inside the gripping device, thus preventing its point of contact from being displaced into an undesirable position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP20010830245 2001-04-10 2001-04-10 Bringergreifer mit progressiver Fadenklemmkraft für Webmaschinen Withdrawn EP1249527A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20010830245 EP1249527A1 (de) 2001-04-10 2001-04-10 Bringergreifer mit progressiver Fadenklemmkraft für Webmaschinen
HK02108744.0A HK1047144A1 (zh) 2001-04-10 2002-12-02 用於編織機附帶有夾子可漸進夾緊緯紗線的緯紗線

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20010830245 EP1249527A1 (de) 2001-04-10 2001-04-10 Bringergreifer mit progressiver Fadenklemmkraft für Webmaschinen

Publications (1)

Publication Number Publication Date
EP1249527A1 true EP1249527A1 (de) 2002-10-16

Family

ID=8184483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010830245 Withdrawn EP1249527A1 (de) 2001-04-10 2001-04-10 Bringergreifer mit progressiver Fadenklemmkraft für Webmaschinen

Country Status (2)

Country Link
EP (1) EP1249527A1 (de)
HK (1) HK1047144A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1595579A (de) * 1967-09-19 1970-06-15
GB2018307A (en) * 1978-04-07 1979-10-17 Somet Soc Mec Tessile A weft-inserting gripper for a continuous weft feed loom
US4807670A (en) * 1986-11-19 1989-02-28 Sulzer Brothers Limited Giver for a gripper loom
EP0509255A1 (de) * 1991-03-22 1992-10-21 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Zubringergreifer für schützenlose Webmaschinen
EP1013807A1 (de) * 1998-12-23 2000-06-28 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Hebel zum Betrieb des Schussfadengreifers eines Schussfadengreiferpaar für Webmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1595579A (de) * 1967-09-19 1970-06-15
GB2018307A (en) * 1978-04-07 1979-10-17 Somet Soc Mec Tessile A weft-inserting gripper for a continuous weft feed loom
US4807670A (en) * 1986-11-19 1989-02-28 Sulzer Brothers Limited Giver for a gripper loom
EP0509255A1 (de) * 1991-03-22 1992-10-21 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Zubringergreifer für schützenlose Webmaschinen
EP1013807A1 (de) * 1998-12-23 2000-06-28 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Hebel zum Betrieb des Schussfadengreifers eines Schussfadengreiferpaar für Webmaschinen

Also Published As

Publication number Publication date
HK1047144A1 (zh) 2003-02-07

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