EP0299553B1 - Pince pour fil - Google Patents

Pince pour fil Download PDF

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Publication number
EP0299553B1
EP0299553B1 EP19880201286 EP88201286A EP0299553B1 EP 0299553 B1 EP0299553 B1 EP 0299553B1 EP 19880201286 EP19880201286 EP 19880201286 EP 88201286 A EP88201286 A EP 88201286A EP 0299553 B1 EP0299553 B1 EP 0299553B1
Authority
EP
European Patent Office
Prior art keywords
piezoelectric
clamp
clip according
thread clip
crystals
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
EP19880201286
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0299553A1 (fr
Inventor
Jozef Verhulst
Frank Ampe
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.)
Picanol NV
Original Assignee
Picanol NV
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 Picanol NV filed Critical Picanol NV
Publication of EP0299553A1 publication Critical patent/EP0299553A1/fr
Application granted granted Critical
Publication of EP0299553B1 publication Critical patent/EP0299553B1/fr
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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/22—Co-operating surfaces mounted for relative movement and arranged to apply pressure to material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2555/00—Actuating means
    • B65H2555/10—Actuating means linear
    • B65H2555/14—Actuating means linear piezoelectric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a wire clamp, and more particularly to a wire clamp for use on weaving machines or other machines processing spun yarn.
  • wire clamp or clamp we mean here any device whose operation ensures the clamping of a wire between two faces, either to brake a moving wire, that is to say to slow the movement or for the '' bring to a halt, either to simply grab a stationary wire presented between the two faces of the clamp.
  • the present invention relates to wire clamps whose movement is ensured by the reverse piezoelectric effect.
  • the present invention relates to a wire clamp which does not have the disadvantages mentioned.
  • the invention provides a clamp having the characteristic of comprising a drive mechanism consisting essentially of at least one piezoelectric element with reverse action.
  • a reverse action piezoelectric element consists of one or more piezoelectric crystals provided with the required electrical connections, the application of an appropriate electrical voltage conventionally making it possible to obtain a deformation of the expanding piezoelectric crystal. or in contraction. This deformation is used to close or open the clamp.
  • the advantages of the pliers for piezoelectric wire according to the invention consist in the small amount of electrical energy required for its operation, in its extremely rapid reaction time, in the fact that its clamping force is completely controllable, in the relatively inexpensive nature of its production and, finally, in its small size when mounted in a weaving machine.
  • a thread clamp according to the invention in addition to its use as a weft clamp, can be used at other points of a weaving machine and in particular at all points requiring clamps, operation requires very precise control.
  • the piezoelectric element with reverse action is formed by a piezoelectric crystal 1 fixed permanently on a support 3 at one of its ends 2, and whose l other end 4, free, forms a clamping element or clamping face which can interact with another element or clamping face 5, fixed permanently to the support 3.
  • the clamping face 4 can be provided with a wear-resistant jaw 6 made for example from a ceramic material.
  • the clamping face 5 can also be provided with a ceramic or other coating.
  • the assembly of this device may include layers of elastic material 7 intended to absorb shocks or vibrations and interposed for example, as illustrated in FIGS. 1 and 2, between the crystal 1 and the wear-resistant jaw 6 and / or between the clamping face 5 and the part of the support 3 on which it rests.
  • the piezoelectric crystal 1 is provided with electrical connections 8 to which an appropriate electrical voltage V can be applied, for example using an electrical supply 9 as illustrated diagrammatically in FIG. 1.
  • FIGS. 1 and 2 The operation of the wire clamp is illustrated in FIGS. 1 and 2.
  • the applied voltage V has a given value V1 and the clamp does not exert any clamping or braking force, so that the wire 10 passes freely between the clamping faces.
  • the applied voltage has a value V2 lower than V1, causing an expansion of the crystal proportional to the drop in voltage, so that the wire 10 is wedged between the jaw 6 and the clamping face 5.
  • the clamping force will increase in proportion to any greater drop in voltage V.
  • Figures 3 and 4 show another alternative embodiment, using a curved piezoelectric crystal 11 whose magnitude of the curvature is a function of the magnitude of the voltage V applied.
  • the piezoelectric crystal 11 is fixed permanently to one of its ends 12 and provided, at the other end 13, with a clamping face 4 formed by a jaw 6 similar to that of the variant embodiment illustrated in FIGS. 1 and 2.
  • This jaw can interact with a clamping element or fixed clamping face 5.
  • the end 12, fixed permanently, is provided with the required electrical connections 8.
  • Figures 5 and 6 illustrate, for an exemplary embodiment, the relationship between the speed of the voltage V applied to the electrical connections 8 and the corresponding clamping force F.
  • the voltage V is reduced so that the clamp begins to exert a certain clamping force F1 on the wire placed in the clamp.
  • a higher clamping force F2 can be achieved by further reducing the applied voltage, as illustrated in phase C.
  • FIGS 7 to 9 illustrate another embodiment which uses two piezoelectric crystals 14 and 15 arranged so as to face each other. Their distant ends 16 and 17 are fixed permanently, while their close ends 18 and 19, provided with wear-resistant jaws, are placed opposite.
  • This last variant offers the advantage of providing, on the one hand, an adjustable clamping force _ two values it is true _ when only one tension is applied, and on the other hand, a relatively large passage for the wire 10 when the two crystals 14 and 15 are energized at the same time.
  • such a double action clamp may also be produced by using two curved piezoelectric crystals 11 of the type mentioned above.
  • the piezoelectric elements 11 or 14-15 do not necessarily have to be mounted opposite. They can, for example, be placed one on the other in a series arrangement, so to speak, in which case they will interact with a clamping face permanently fixed.
  • Such a series connection could also consist of several piezoelectric crystals, the application of a single voltage value V then making it possible to obtain a clamping force adjustable in several steps.
  • these variant embodiments may also include a layer of damping material 7.
  • FIG. 10 shows an assembly of a weft thread driving mechanism for weaving machines, using four thread clamps 20 to 23. Furthermore, this weft driving mechanism essentially provides a reel holder 24, a supply device 25 formed by reel rollers 26 and a cylindrical tube 27 in which the weft thread 10 is stored in spiral form, preferably a main blower 28 and a comb 29 in a U shape.
  • the first clamp 20, placed at the outlet of the cylindrical tube 25, has the function of blocking at the required moments the wire taken in the tube.
  • a piezoelectric clamp 20 proves to be particularly advantageous on weft yarn supply devices of the type in which the weft yarn 10, as illustrated in FIG. 20, is stored in spiral form in a cylindrical tube 27 and more generally on any supply device in which the length of the pick is not directly determined by the shape of the supplier.
  • the exact determination of the pick to be inserted requires precise adjustment of the clamp 20 acting as a weft insertion clamp. This precision concerns both the opening and closing times, the opening and closing speeds and the dosage of the clamping force.
  • a clamp for piezoelectric wire according to the invention makes it possible to meet these requirements in a much more rigorous manner than conventional clamps.
  • the operation of the clamp 20 largely determines the operation of the entire weft insertion mechanism.
  • the clamp 20 When the clamp 20 is closed, a certain amount of wire is blown into the cylindrical tube 25 where it accumulates by depositing in a spiral along the inner wall of the tube.
  • the weft thread At the opening of the clamp 20, the weft thread is released; at the end of the insertion, the complete closure of the clamp 20, with the application of a high clamping force, causes the weft thread 10 to be blocked when its free end reaches the end of the crowd.
  • the clamp 20 As the clamp 20 is caused to abruptly close, it will preferably be provided with a layer of damping material 7.
  • the second clamp 21 is placed at the end of the crowd. It is known that when a weft thread is braked by the clamp 20 when this thread reaches the end of the crowd, its force of inertia imposes an elastic elongation followed by a contraction, resulting in a recoil effect of the end of the wire 10. To avoid this recoil and, consequently, to prevent the formation of loops in the fabric, the wire 10 is conventionally straightened using a pneumatic weft guide which intercepts the front end of the wire weft. Interception and straightening of the wire could however also be carried out by pliers offering a sufficiently short reaction time to grasp the wire within an adequate time on receipt of a command signal.
  • a piezoelectric clamp 21 is particularly suitable for the application which has just been described. Since the clamp 21 must be capable, in the open position, of intercepting the weft thread inserted in the crowd, it should preferably have a relatively wide passage in the open position. It is therefore advisable to use for this application a wire clamp of the type illustrated in Figure 7 or, a clamp incorporating one or more piezoelectric crystals connected in series. The presence of the wire 10 will preferably be detected by the piezoelectric crystals of the clamp 21 itself, so as to generate the control signal mentioned above.
  • a piezoelectric clamp can be used to hold the weft thread on the insertion side.
  • a high clamping force and a relatively large passage for the wire 10 are two very important factors.
  • the third clamp 22 straightens the wire 10 in front of the unwinding rollers 26.
  • the clamp 22 is formed by two curved crystals 11 which can work in interaction and capable of clamping the wire 10 between the jaws 6.
  • the fourth clamp 23, mounted just in front of the main blower 28, can exert an adjustable pressing force on a wire, so that the wire 10 can be braked gradually when it reaches the end of the crowd, so as to avoid overvoltages and reduce the risk of breakage of the weft thread.
  • the assembly given in FIG. 10 illustrates a whole series of possible applications of the clamp for piezoelectric wire according to the invention.
  • the first clamp 20 has the function of blocking a moving wire.
  • the second clamp 21 is used only to grip a wire.
  • the third and fourth clamps, 22 and 23 respectively, have a braking function and exert only a reduced clamping force on the moving wire 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Wire Bonding (AREA)
EP19880201286 1987-06-29 1988-06-22 Pince pour fil Expired - Lifetime EP0299553B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8700726A BE1000703A4 (nl) 1987-06-29 1987-06-29 Draadklem.
BE8700726 1987-06-29

Publications (2)

Publication Number Publication Date
EP0299553A1 EP0299553A1 (fr) 1989-01-18
EP0299553B1 true EP0299553B1 (fr) 1991-03-06

Family

ID=3882745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880201286 Expired - Lifetime EP0299553B1 (fr) 1987-06-29 1988-06-22 Pince pour fil

Country Status (3)

Country Link
EP (1) EP0299553B1 (nl)
BE (1) BE1000703A4 (nl)
DE (1) DE3861932D1 (nl)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2648120B1 (fr) * 1989-06-09 1991-12-13 Steib Bertrand Dispositif de freinage a pre-reglage et commande automatique pour un fil en deplacement
JPH07331558A (ja) * 1994-06-06 1995-12-19 Toyota Autom Loom Works Ltd レピア織機における緯入れ方法及び装置
FR2741332B1 (fr) * 1995-11-17 1998-01-02 Giat Ind Sa Dispositif de blocage d'une ligne defilante entrainee en translation
DE29808997U1 (de) 1998-05-18 1998-07-30 Textilma Ag, Hergiswil Greifer und eine Schusseintragvorrichtung für eine Greiferwebmaschine
DE19852794B4 (de) * 1998-11-16 2004-03-25 Lindauer Dornier Gmbh Steuerbare Schussfadenzubringer- und -klemmvorrichtung für Webmaschinen
IT1304701B1 (it) * 1998-12-11 2001-03-28 Vamatex Nuova Spa Attuatore ad effetto piezoelettrico in particolare per l'applicazionenelle macchine tessili
DE50306806D1 (de) * 2002-09-18 2007-04-26 Lindauer Dornier Ges Mit Besch Verfahren zum halten eines schussfadens; düsenwebmaschine mit klemmeinrichtung für den schussfaden insbesondere zur durchführung des verfahrens und kartusche als auswechselbare baueinheit zum einsetzen in das mischrohr einer düsenwebmaschine
CN107671431B (zh) * 2016-08-02 2023-08-04 北京清大天达光电科技股份有限公司 一种带气动夹手的夹线装置
CN112779650B (zh) * 2020-12-29 2022-09-20 西安工程大学 压电驱动柔性铰接止纱销

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1076929A (en) * 1963-09-19 1967-07-26 Ramon Balaguer Golobart Device for clamping and releasing weft yarns
DE2364680C2 (de) * 1973-12-27 1982-08-26 Rüti-te Strake B.V., 5750 Deurne Solenoidbetätigte Fadenklemme bzw. -schneidvorrichtung oder dergleichen für Webmaschinen

Also Published As

Publication number Publication date
BE1000703A4 (nl) 1989-03-14
DE3861932D1 (de) 1991-04-11
EP0299553A1 (fr) 1989-01-18

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