EP1426471A2 - Bringergreifer für Webmaschinen - Google Patents

Bringergreifer für Webmaschinen Download PDF

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Publication number
EP1426471A2
EP1426471A2 EP03104502A EP03104502A EP1426471A2 EP 1426471 A2 EP1426471 A2 EP 1426471A2 EP 03104502 A EP03104502 A EP 03104502A EP 03104502 A EP03104502 A EP 03104502A EP 1426471 A2 EP1426471 A2 EP 1426471A2
Authority
EP
European Patent Office
Prior art keywords
gripper
lever
weft yarn
lamina
yielding
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
EP03104502A
Other languages
English (en)
French (fr)
Other versions
EP1426471B1 (de
EP1426471A3 (de
Inventor
Roberto Midali
Luigi Cattaneo
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
Publication of EP1426471A2 publication Critical patent/EP1426471A2/de
Publication of EP1426471A3 publication Critical patent/EP1426471A3/de
Application granted granted Critical
Publication of EP1426471B1 publication Critical patent/EP1426471B1/de
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
    • D03D47/23—Thread grippers
    • D03D47/233—Carrying grippers

Definitions

  • the present invention relates to an improved carrying gripper for weaving looms.
  • gripper looms are known in which the weft yarn is introduced into the shed by a pair of grippers - a carrying gripper and a drawing gripper - which pass said weft yarn to each other in the middle of the shed, said grippers being fixed at the end of alternate-motion straps which introduce them into and move them within the shed.
  • the present invention relates to carrying grippers of the type comprising a gripper body and an oscillating lever under the action of spring means so as to grip and hold with one end the weft yarn between the same and a base of said body, the opening of said gripper being controlled by a gripper-opening device engaging the other end.
  • an elastic system with a high degree of rigidity entails, in the activation step of the lever holding the weft, a control characterised by an impulsive collision.
  • a control characterised by an impulsive collision For the gripper to withstand such collision, it must be equipped with a base made of a hard material, such as widia, capable of absorbing (without wearing) the impulsive pressure induced by the impact of the lever.
  • the present invention aims at improving the gripping of the weft by introducing a geometrical asset of the gripping elements which forces the gripped portion of weft to bend at an acute angle.
  • a weft tail at an acute angle actually improves the friction conditions and therefore the weft holding. Friction increase allows to reduce the rigidity of the elastic element, resulting in a diminished collision energy developing in the step during which the lever itself clicks into a closing position following deactivation of the gripper-opening device at the shed entrance.
  • the reduction of the existing elastic potential energy further allows to do without the widia hard base normally provided on the gripper body at the engagement area of the oscillating lever holding the weft with the gripper body itself.
  • a weft-feeding carrying gripper for weaving looms of the type carried by an alternate-motion strap and comprising a gripper body and an oscillating lever under the action of spring means, to grip and hold with one end the weft yarn between the same and a base of said body, the opening of said gripper being controlled by a gripper-opening device engaging the other end thereof, characterised in that the base of the gripper body has a recess above which there is mounted a yielding lamina with which the end of said lever holding the weft yarn engages.
  • said yielding lamina preferably comprises a slot with which is meant to cooperate a complementary projection of said end of the lever holding the weft yarn, said slot of the lamina and said projection of the lever extending lengthwise to the gripper and having the shape of much extended isosceles triangles with the base close to the tip of the gripper.
  • said recess in the base of the gripper body preferably houses a pad made of soft material.
  • a gripper according to the invention allows to replace the system used in the prior art - an elastic lamina with a high degree of rigidity which pushes a lever against a hard plane - with a system consisting of an elastic lamina with a low degree of rigidity which pushes the lever against a yielding lamina, the latter being mounted over a recess, free to deform.
  • fig. 1 shows a perspective view of a carrying gripper according to the prior art, whereof
  • fig. 2 is a cross-section
  • fig. 3 is a perspective view with the components disassembled of the known gripper illustrated in figg. 1 and 2;
  • fig. 4 shows, in an enlarged lateral view, the front part of the carrying gripper illustrated in figg. 1 to 3;
  • fig. 5 is a detail further enlarged of the view illustrated in fig. 4 showing the engagement with the weft yarn in two successive gripper stroke moments
  • figg. 6 and 7 being transversal cross-sections drawn according to the lines VI-VI and VII-VII in fig. 5 to illustrate such engagement in said moments;
  • fig. 8 shows a global perspective view of the carrying gripper according to the invention, whereof
  • fig. 9 is a transversal cross-section
  • fig. 10 is a perspective view with the parts disassembled of the gripper according to the invention illustrated in figg. 8 and 9;
  • fig. 11 shows, in an enlarged lateral view, the front part of the carrying gripper illustrated in figg. 8 to 10, in a first embodiment
  • fig. 12 is a detail further enlarged of the view illustrated in fig. 11;
  • figg. 13 and 14 are transversal cross-sections drawn according to the lines XIII-XIII and XIV-XIV in fig. 12, to illustrate the engagement with the weft yarn in two successive gripper stroke moments;
  • fig. 15 is the further enlarged detail of the front part of a second embodiment of the carrying gripper shown in figg. 8 to 10;
  • figg. 16 and 17 are transversal cross-sections drawn according to the lines XVI-XVI and XVII-XVII shown in fig. 15, to illustrate the engagement with the weft yarn in two successive gripper stroke moments;
  • fig. 18 shows, in the same scale as fig. 15, the preferred shape of the slot of the yielding lamina which is a characteristic of the gripper according to the invention.
  • carrying grippers are known such as that, manufactured and used by the Applicant in their own weaving looms and illustrated in figg. 1 to 9 of the accompanying drawings, comprising a gripper body 1, a lever 2 mounted oscillating onto said body at 3, spring means consisting of an elastic lamina 4 normally acting onto said lever 2 to push its end 5 against the base 6 of the gripper body 1, so that said gripper grips and holds the weft yarn T, and an open protection element 7 provided with slits 8 and 9 guiding the weft yarn.
  • grippers such as the ones illustrated in figg.
  • the invention provides a gripper such as the one illustrated as a whole in figg. 8 to 10 and in two embodiments in figg. 11 to 14, and 15 to 18 respectively.
  • This gripper comprises, like the one shown in figg. 1 to 8, a gripper body 1, a lever 2 mounted oscillating onto said body at 3, spring means consisting of an elastic lamina 4, normally acting onto said lever 2 to push its end 5 against the base 6 of the gripper body 1, to grip and hold the weft yarn T, and an open protection element 7, provided with a slit 8 guiding the weft yarn.
  • base 6 of the gripper body 1 has, at the engaging area of the weft yarn T, a recess 13, over which a yielding lamina 14 is mounted, with which the end 5 of lever 2 holding the weft yarn T 2 is engaged.
  • the yielding lamina 14 comprises a slot or slit 15 with which, during the functioning of the gripper, a complementary-shaped rib 16 cooperates, obtained below in the end 5 of the lever 2, slot 15 and rib 16 extending lengthwise to the gripper body 1.
  • the yielding lamina 14 takes up the whole length of the recess 13 of the gripper body, substantially in the middle of which is located, slightly projecting, a pad 17 made of soft material, whereas in the embodiment of figg. 15 to 17 the yielding lamina 14 projects onto the recess 13, of which it leaves free the final portion.
  • the slot 15 the shape of a much extended isosceles triangle, with the base close to the tip of the gripper, as it is shown by way of example in fig. 18 for the gripper of figg. 15 to 17.
  • the same shape is taken up by the rib 16 of the end 5 of the lever 2 (which must have, as already explained, a complementary shape to that of the slot 15).
  • This shape of the slot 15 and of the rib 16 further aids the horizontal arrangement at an acute angle of the weft tail when it is gripped by a gripper such as those in figg. 8 to 18.
  • This arrangement which is a characteristic of the invention, noticeably improves the gripping and the holding of the weft yarn. The effect is so much better, the narrower the acute angle at issue is, which advantageously occurs indeed when the slot 15 and the rib 16 are shaped as an isosceles triangle as shown in fig. 18.
  • the weft can be effectively held while it is transported into the shed (preventing it from slipping off the gripper due to the strong acceleration at the dead centre positions at the entrance and in the middle of the shed, with negative consequences on the weaving being performed) without having to resort to an excessive rigidity of the elastic system employed to hold it (thus avoiding the impulsive collisions which in the known art required to equip the gripper with a base made of a hard material, such as widia).
  • the synergy developing between the nature and the geometrical asset of the tightening elements determines an acute-angle bending of the weft tail portion gripped and held by the gripper, which noticeably improves the friction conditions and therefore the holding of the weft itself. Since this occurs so much more effectively, the narrower the acute angle is according to which the tail arranges itself, it is convenient to give the slot 15 of the yielding lamina 14 the shape of the isosceles triangle shown (fig. 18) for the preferred embodiment of the invention, shape which indeed aids the tail bending at a very narrow acute angle.
  • the arrangement according to the invention allows, on the other hand, to reduce the rigidity of the elastic gripping system, with a resulting reduction of the collision energy developing in the step in which the retaining lever clicks into a closing position, at the deactivation of the gripper-opening device at the shed entrance, which brings advantages in terms of durability and gripper costs (besides, the expensive widia inlays are superfluous), as well as in terms of noise reduction during weaving.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Coin-Freed Apparatuses For Hiring Articles (AREA)
  • Air Bags (AREA)
EP03104502A 2002-12-04 2003-12-02 Bringergreifer für Webmaschinen Expired - Lifetime EP1426471B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT002568A ITMI20022568A1 (it) 2002-12-04 2002-12-04 Pinza portante perfezionata per telai di tessitura
ITMI20022568 2002-12-04

Publications (3)

Publication Number Publication Date
EP1426471A2 true EP1426471A2 (de) 2004-06-09
EP1426471A3 EP1426471A3 (de) 2004-12-08
EP1426471B1 EP1426471B1 (de) 2010-04-21

Family

ID=32310169

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03104502A Expired - Lifetime EP1426471B1 (de) 2002-12-04 2003-12-02 Bringergreifer für Webmaschinen

Country Status (5)

Country Link
EP (1) EP1426471B1 (de)
AT (1) ATE465288T1 (de)
DE (1) DE60332207D1 (de)
HK (1) HK1066835A1 (de)
IT (1) ITMI20022568A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3822400A1 (de) 2019-11-13 2021-05-19 Picanol Beweglicher hebel für eine fadenklemme für einen greifer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1122422A (fr) * 1955-02-24 1956-09-06 Perfectionnements apportés aux dispositifs passe-trame des métiers à tisser
EP0864679A1 (de) * 1997-03-14 1998-09-16 Sulzer Rüti Ag Greiferklemme für einen Bringergreifer und Webmaschine mit Greiferklemme

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1122422A (fr) * 1955-02-24 1956-09-06 Perfectionnements apportés aux dispositifs passe-trame des métiers à tisser
EP0864679A1 (de) * 1997-03-14 1998-09-16 Sulzer Rüti Ag Greiferklemme für einen Bringergreifer und Webmaschine mit Greiferklemme

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3822400A1 (de) 2019-11-13 2021-05-19 Picanol Beweglicher hebel für eine fadenklemme für einen greifer
EP3822400B1 (de) 2019-11-13 2024-01-03 Picanol Beweglicher hebel für eine fadenklemme für einen greifer

Also Published As

Publication number Publication date
DE60332207D1 (de) 2010-06-02
ITMI20022568A1 (it) 2004-06-05
EP1426471B1 (de) 2010-04-21
HK1066835A1 (en) 2005-04-01
EP1426471A3 (de) 2004-12-08
ATE465288T1 (de) 2010-05-15

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