EP0387129A1 - Nadel zur Durchführung von Vorgängen mit Faden, Strähnen und biegeweichen Schnüren sowie Vorrichtung zur Verwendung einer solchen Nadel - Google Patents

Nadel zur Durchführung von Vorgängen mit Faden, Strähnen und biegeweichen Schnüren sowie Vorrichtung zur Verwendung einer solchen Nadel Download PDF

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Publication number
EP0387129A1
EP0387129A1 EP90400553A EP90400553A EP0387129A1 EP 0387129 A1 EP0387129 A1 EP 0387129A1 EP 90400553 A EP90400553 A EP 90400553A EP 90400553 A EP90400553 A EP 90400553A EP 0387129 A1 EP0387129 A1 EP 0387129A1
Authority
EP
European Patent Office
Prior art keywords
needle
needle according
loop
elongated body
parallel
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
EP90400553A
Other languages
English (en)
French (fr)
Other versions
EP0387129B1 (de
Inventor
Jean Paul Ducamp
Etienne Lemaire
Robert Montignac
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.)
Airbus Group SAS
Original Assignee
Airbus Group SAS
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 Airbus Group SAS filed Critical Airbus Group SAS
Publication of EP0387129A1 publication Critical patent/EP0387129A1/de
Application granted granted Critical
Publication of EP0387129B1 publication Critical patent/EP0387129B1/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
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D41/00—Looms not otherwise provided for, e.g. for weaving chenille yarn; Details peculiar to these looms
    • D03D41/004—Looms for three-dimensional fabrics

Definitions

  • the invention relates to a needle intended for carrying out operations with flexible threads, rovings or cords.
  • a needle of this kind finds particular application in the field of the manufacture of reinforcements by multidirectional weaving. Such reinforcements are used, after impregnation with an appropriate binder and polymerization, to produce structural assemblies in composite material which can undergo very significant mechanical and thermal stresses.
  • the invention more particularly aims to allow the weaving of a structure which will comprise continuous fibers oriented in at least three directions generally perpendicular to each other.
  • the general principle of weaving such structures consists in placing fibers in two directions between and around a third direction materialized either by rigid rods, for example metallic, or by stretched wicks, or finally by rods made of composite material by impregnated, hardened and calibrated wicks.
  • a known technique for producing such a structure consists in "depositing" fibers using hollow needles which receive and transport the fibers through the network and then abandoning them during a recoil movement, these being maintained stretched along their outward path by holding elements.
  • the fibers are transported in hollow needles, the elongated body of which is a barrel of flattened section that is substantially rectangular, the reduced width of which allows passage between metal rods or stretched wicks.
  • the hollow needles used in this technique must be rigid enough not to deviate from their direction under the effect of the forces applied to them and which are due to the entrainment of the fibers and this so as not to damage the network of vertical rods, nor to deteriorate the fibers they transport.
  • the needles must be easy to use when preparing the device before weaving, in particular to allow the fibers to be introduced into the barrel.
  • Known needles are made from a thin-walled tube which is flattened until the thickness compatible with the width of the meshes of the network is obtained and the end of which is cut into a bevel which is carefully deburred. .
  • the object of the invention is to remedy the drawbacks which have just been mentioned and to propose a needle structure which is easy to produce, in particular in large series, of convenient and safe use, and which can be adapted to various types of fibers used in the manufacture of composite materials with high mechanical and thermal performance.
  • the invention provides a needle of the type comprising an elongated body and an eye formed in the vicinity of its end, characterized in that the eye is a closed loop which extends outside the body of the needle.
  • the loop is shaped and arranged relative to the body so as not to protrude laterally outside the body of the needle.
  • the loop is delimited by two parallel cheeks which extend from one face of the elongated body and by an axis for guiding the wires which connects the two cheeks together.
  • the section of the guide axis has a profile adapted to the nature of the wires, and if the elongated body has a substantially rectangular section, the two guide cheeks extend parallel to the two large lateral faces of the elongated body and are separated by a distance less than or equal to the width of the rectangular section of the body.
  • the loop is constituted by a ring attached to one of the faces of the elongated body and the section of which has a profile adapted to the nature of the wires.
  • the ring extends in a plane parallel to the two large lateral faces of the body.
  • the loop is a hole formed in a portion of the body which projects transversely from one face of the latter.
  • the portion in which the hole is formed is a thinned portion which extends parallel to the two large faces of the body.
  • the loop can be arranged in withdrawal with respect to the free end of the elongated body of the needle, the latter preferably being a solid body.
  • the invention finally proposes a device for the use of a needle as defined above, of the type in which the body of the needle is fixed to a drive member driven in a reciprocating movement, characterized in that the drive member comprises at least one wire guide hole formed in a part linked in movement to this member to keep the wires substantially parallel to the elongated body.
  • the needle shown in FIGS. 1 to 3 comprises an elongated solid body 10 of which only the end is shown in FIG. 1.
  • the body 10 has a substantially rectangular section of width "l" and length "L".
  • the section of the body is substantially rectangular and is delimited by two large parallel lateral faces and by two small lower and upper faces.
  • the very reduced width "l" which separates the two lateral faces must allow the body 10 of the needle to pass, for example between two vertical rods 12 which are shown in mixed lines.
  • the free end 14 of the straight elongated body 10 is bevelled.
  • the eye 16 of the needle is a loop 18 through which the fibers, or the rovings, 20 pass.
  • the loop 18 is delimited by the small internal face 22 of the elongated body 10, by two triangular and parallel cheeks 24 and 26 and by a guide axis 28.
  • the two cheeks 24 and 26 extend transversely relative to the elongated body 10 from the small face 22 parallel to the two large faces 30 and 32 thereof.
  • the two cheeks 24 and 26 are attached by welding to the elongated metal body 10 and are flush with the two large parallel faces 30 and 32.
  • the guide and closing axis of the loop 18 is a profiled axis of circular section.
  • the front side 34 of the triangular cheeks 24 and 26 is in the extension of the beveled end 14 of the elongated body 10.
  • the cheeks 24 and 26 also serve for the good maintenance of the fibers 20 and extend down below the guide axis 28.
  • the length "L" of the rectangular section can be equal to 6 mm, its width "l” equal to 0.5 mm, the thickness "e” of the cheeks to 0 , 05 mm and the diameter of the cylindrical profile axis 28 between 1 and 2 mm.
  • the needle according to the embodiment which has just been described makes it possible to remove the tubular part of the body proper and to replace it with a solid body having high mechanical characteristics and which can for example be produced by rolling a cord on piano.
  • This design allows the fibers or the rovings to be supported by the needle only in the places strictly necessary for its guidance, that is to say in the loop forming the eye, and to leave them free otherwise to avoid stuffing phenomena, to cause the radii of curvature of the fibers which are adapted to their own mechanical characteristics by determining a minimum admissible radius of curvature as a function of the elasticity modules of the fibers, and of protecting the curved part 21 of the fibers during the phase of penetration into the network, and this in particular by the fact that the loop is arranged set back from the free end of the body 10.
  • the embodiment described in Figure 4 differs from the previous embodiment only in the outer contour of the cheeks which are no longer perfectly triangular but slightly rounded. It is also noted that the contour of the section of the axis 28 has a profile substantially in the shape of an ellipse which can be used with fibers 20 for which a more acute maximum angle of curvature of their portions 21 is admissible.
  • the arrangement of the lateral cheeks is such that the loop does not protrude laterally outside the space defined by the width "l" of the elongated body 10.
  • the body 10 is identical to that shown in Figures 1 to 3 and is in particular of rectangular section.
  • a metal ring 40 On the small face 22 is reported a metal ring 40 whose two ends 42 and 44 are for example welded.
  • the ring 40 extends transversely in the plane parallel to the lateral faces 30, 32 of the elongated body 10 to form a loop 18 through which the fibers 20 pass.
  • the ring is a metal rod, the section of which can be circular or elliptical as shown in FIGS. 6A and 6B.
  • the rod 40 can be reinforced by a welded rear tab 46 to resist the traction applied to it by the fibers 20 during the forward stroke of penetration into a weaving structure.
  • the loop 18 is a complete circular ring 40 which is welded to the small underside 22 of the body 10 and which also extends in the plane of the body 10 parallel to its two large faces 30 and 32.
  • the thickness of the ring 40 is chosen to be as small as possible so that the lateral size of the latter plus the thickness of the fibers on both sides other of its section, do not exceed the width "l" of the elongated body 10.
  • the end of the body of rectangular section 10 comprises a thinned portion 50 which projects transversely with respect to its general direction and in which a hole 52 which constitutes the loop 18 is drilled in which pass the fibers 20.
  • the edge of the hole 52 can be profiled and in particular rounded in order not to damage the fibers due to their friction on this edge.
  • the thinned portion 50 is parallel to the large lateral faces 30 and 32 of the body 10 and extends transversely from the small lower face 22.
  • the outer contour of the thinned portion 50 can take different forms, for example those shown in FIGS. 1 or 4.
  • FIGS. 10A to 10C show schematically a three-dimensional weaving machine equipped with solid needles produced in accordance with the teachings of the invention.
  • the machine comprises a frame 100 on which a coil 102 is rotatably mounted and on which is guided in sliding in a sleeve 104 a slide 106 of a member 108 for driving back and forth of a needle 10.
  • the movements of the drive member 108 can for example be caused by a double-acting cylinder 110.
  • the needle 10 is of the type shown in Figures 1 to 3 and allows the fibers 20 of the spool 102 to be penetrated back and forth through a network vertical rods 12.
  • the structure 108 has two attached tabs 112 each comprising a large hole 114 which is used for guiding and holding the fibers 20 along the body 10 of the needle during movements of the latter.
  • the actuation of the jack causes the needle 10 to penetrate through the vertical network 12 until its free end 14 comprising the eye 18 extends beyond the network, it i.e. right as shown in Figure 10B.
  • a bar 116 for retaining the fibers 20 is introduced and the jack can cause the return movement of the needle 10 which "deposits" the fibers 20 in the network 12 to reach the position represented in FIG. 10C which is similar to that shown in FIG. 10A after a round-trip deposition of the fibers 20.
  • the fibers 20 have been guided and maintained substantially parallel to the body 10 thanks to the guide holes 114 of the structure 108.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Decoration Of Textiles (AREA)
  • Woven Fabrics (AREA)
EP90400553A 1989-03-06 1990-02-28 Nadel zur Durchführung von Vorgängen mit Faden, Strähnen und biegeweichen Schnüren sowie Vorrichtung zur Verwendung einer solchen Nadel Expired - Lifetime EP0387129B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8902905 1989-03-06
FR8902905A FR2643916B1 (fr) 1989-03-06 1989-03-06 Aiguille destinee a l'execution d'operations avec des fils, meches ou cordons souples et dispositif pour l'utilisation d'une telle aiguille

Publications (2)

Publication Number Publication Date
EP0387129A1 true EP0387129A1 (de) 1990-09-12
EP0387129B1 EP0387129B1 (de) 1997-09-10

Family

ID=9379402

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90400553A Expired - Lifetime EP0387129B1 (de) 1989-03-06 1990-02-28 Nadel zur Durchführung von Vorgängen mit Faden, Strähnen und biegeweichen Schnüren sowie Vorrichtung zur Verwendung einer solchen Nadel

Country Status (6)

Country Link
US (1) US5127443A (de)
EP (1) EP0387129B1 (de)
JP (1) JP2644605B2 (de)
CA (1) CA2011512C (de)
DE (1) DE69031396T2 (de)
FR (1) FR2643916B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6059369A (en) * 1997-05-01 2000-05-09 Lear Corporation Composite vehicle seat back frame and method of manufacturing thereof
US6112775A (en) * 1999-03-05 2000-09-05 Narricot Industries Incorporated Weft yarn selection mechanism and methods for weaving seat belt webbing
DE502004009942D1 (de) * 2004-06-03 2009-10-01 Textilma Ag Schussfadeneintragnadel für eine nadelbandwebmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304195A (en) * 1941-02-08 1942-12-08 Crompton & Knowles Loom Works Thread control for axminster needle motion
GB570457A (en) * 1943-09-09 1945-07-09 Cecil Henry Baddeley Weft carriers for shuttleless looms
CH508075A (de) * 1970-06-04 1971-05-31 Saurer Ag Adolph Garnhalteeinrichtung an einem Schussfadeneintragsorgan einer Webmaschine
US4006758A (en) * 1975-08-15 1977-02-08 Libby Carl F Narrow web loom
CH598382A5 (en) * 1975-07-25 1978-04-28 Mueller Jakob Forschungs Und F Needle loom for narrow goods

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2409445A (en) * 1944-05-02 1946-10-15 Max M Newman Sewing machine needle
NO133739C (de) * 1973-01-27 1976-06-23 Opti Holding Ag
US3986531A (en) * 1974-04-25 1976-10-19 Flair Zipper Corporation Loom for weaving a slide-fastener element to a tape
US4133339A (en) * 1975-07-11 1979-01-09 Floss Aid Corporation Needle with deformable eye
US4526026A (en) * 1984-04-11 1985-07-02 Krauland Jr Konrad L Method and apparatus of producing continuous three-dimensional fabrics
FR2564490B1 (fr) * 1984-05-15 1986-09-19 Aerospatiale Perfectionnements aux profiles composites tricotes en trois dimensions et procede pour leur fabrication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304195A (en) * 1941-02-08 1942-12-08 Crompton & Knowles Loom Works Thread control for axminster needle motion
GB570457A (en) * 1943-09-09 1945-07-09 Cecil Henry Baddeley Weft carriers for shuttleless looms
CH508075A (de) * 1970-06-04 1971-05-31 Saurer Ag Adolph Garnhalteeinrichtung an einem Schussfadeneintragsorgan einer Webmaschine
CH598382A5 (en) * 1975-07-25 1978-04-28 Mueller Jakob Forschungs Und F Needle loom for narrow goods
US4006758A (en) * 1975-08-15 1977-02-08 Libby Carl F Narrow web loom

Also Published As

Publication number Publication date
DE69031396T2 (de) 1998-01-15
DE69031396D1 (de) 1997-10-16
FR2643916A1 (fr) 1990-09-07
EP0387129B1 (de) 1997-09-10
FR2643916B1 (fr) 1991-10-11
JPH02269834A (ja) 1990-11-05
CA2011512C (fr) 1999-11-09
CA2011512A1 (fr) 1990-09-06
JP2644605B2 (ja) 1997-08-25
US5127443A (en) 1992-07-07

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