EP1375716A1 - Procédé et dispositif pour l'insertion de la trame dans un métier à tisser à jet - Google Patents

Procédé et dispositif pour l'insertion de la trame dans un métier à tisser à jet Download PDF

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Publication number
EP1375716A1
EP1375716A1 EP03405202A EP03405202A EP1375716A1 EP 1375716 A1 EP1375716 A1 EP 1375716A1 EP 03405202 A EP03405202 A EP 03405202A EP 03405202 A EP03405202 A EP 03405202A EP 1375716 A1 EP1375716 A1 EP 1375716A1
Authority
EP
European Patent Office
Prior art keywords
thread
weft
winding drum
length
main nozzle
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Withdrawn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
EP03405202A
Other languages
German (de)
English (en)
Inventor
Klaus Berktold
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.)
Itema Switzerland Ltd
Original Assignee
Sultex AG
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 Sultex AG filed Critical Sultex AG
Priority to EP03405202A priority Critical patent/EP1375716A1/fr
Publication of EP1375716A1 publication Critical patent/EP1375716A1/fr
Withdrawn legal-status Critical Current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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • 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
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • 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
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices

Definitions

  • the invention relates to a method and an apparatus for the Weft entry in a jet loom according to the preamble of independent claim of the respective category.
  • the weft is inserted using a Transport medium, which the respective weft thread through the open Enters the shed.
  • this is the transport medium Air.
  • Thread length which of course depends on the weaving width
  • the main nozzle is fed with compressed air and accelerates the weft into the open shed.
  • Main nozzle arranged stationary with respect to the sley, so that the Main nozzle synchronously carries out the oscillating movement with the sley.
  • auxiliary or relay nozzles are provided, which also use compressed air be fed.
  • the front end the weft z. B. captured and held by a stretching nozzle and the Weft thread is struck against the fabric by the weaving drawer. Then the change of subject takes place, whereby the weft thread over the entire Weaving width is integrated. Then on the shot side between the Main nozzle and the fabric edge facing the thread cut to be ready for the next shot entry.
  • weft thread represents a high friction load for the weft yarn. With elastic weft yarns and / or when weaving over large widths the achievable effect is often not sufficient.
  • the invention is intended to provide a method and an apparatus for the Weft entry in a jet loom can be proposed especially with relatively elastic weft yarns and / or large ones Weave widths, allow good weft insertion and such problems, Avoid machine stops, for example an unwanted jumping out of the weft thread from the main nozzle.
  • a method for weft insertion at a Jet loom proposed, which in each cycle Weft thread of a definable length to be entered from a winding drum a thread feeding device is withdrawn, the weft thread by means of a main nozzle, which is fed with a transport medium open shed is entered by changing the subject in the Tissue is integrated, and on the side facing the main nozzle Edge of the goods is cut.
  • the removal of the to be entered at least once such that first a first definable thread length for pulling off the Winding drum is released and then at least one more further predefinable thread length for pulling off the winding drum is released.
  • the weft is thus pulled off the Winding drum of the thread delivery device in each work cycle in at least two steps.
  • the first thread length becomes the deduction Approved.
  • at least one more thread length released for deduction can solve many problems solve that especially when weaving with elastic weft yarns and / or occur with large weaving widths.
  • a second - thread length can be, for example, the Weft threads can be relaxed in a targeted manner. It is also possible Slow down the weft after its entry or the Convey weft safely to the beginning of the weft insertion channel.
  • the interruption according to the invention of removing the entry to be entered Weft can be beneficial at several points in the work cycle are used, as will be explained in more detail later.
  • the pulling of the weft can be interrupted before the Insertion of the weft is finished. It will be the first one Thread length released and entered in the shed.
  • the first Thread length is such that it is not for a complete Weft entry or for reaching the holding or stretching nozzle is sufficient.
  • the weft will already be at the end of the weft insertion braked.
  • the second thread length is released, which is dimensioned in this way is that the weft entry can be completed. From this Measure results in a gentler braking of the weft thread, so that Stop strokes or stretch strokes can be avoided.
  • Another preferred measure is that between the main nozzle part of the inserted weft thread after the Change of subject and before cutting by releasing one of the Thread lengths is relaxed.
  • the thread will be in front of its Cutting at least partially relaxed, that is, the inner ones Tensions in the thread are reduced and thus its elastic Elongation at least reduced. Now the weft thread is so relaxed cut between the main nozzle and the edge of the goods facing it without the risk of the rear jumping out Thread from the main nozzle, which stops the loom would result.
  • the first thread length is preferably for the one to be inserted Weft thread through a first thread stop and the further thread length limited by a second thread stopper by pulling off the first thread length the first thread stopper with the winding drum in Active connection is brought so that further pulling is prevented and for the further thread length the operative connection between the first Thread stopper and the winding drum is released so that the further Thread length is withdrawn from the winding drum until another Pull off through the operative connection between the second thread stopper and the winding drum is prevented.
  • a thread delivery device that has a winding drum and two thread stoppers is, for example from EP-A-0 561 218 or US-A-5,322,090 known.
  • the second thread stopper is used for one a web stop caused by incorrect weft insertion Release the weft reserve to break the weft between the main nozzle and the selvedge on the entry side.
  • the present invention proposes to pulling the weft from the winding drum every working cycle to interrupt at least once. In particular, this enables the elastic properties of the weft should be taken into account.
  • the further thread length is preferably determined by the angular distance dimensioned, the two thread stoppers with respect to the circumferential direction of the Have winding drum to each other.
  • This has the advantage of being more Thread length in a simple way to the elastic properties of the respective weft can be adjusted.
  • the two thread stoppers are arranged in the vicinity of the outer peripheral surface of the winding drum and have one with respect to the circumferential direction of the winding drum adjustable angular distance to each other. Given the radius of the The winding drum can then be adjusted to the desired length or set the required value in which the second thread stopper is relative to the first thread stopper is moved along the circumferential direction.
  • the invention provides a device for weft insertion a jet loom proposed with a thread feeding device, which has a winding drum, one of which in each working cycle
  • the weft thread that can be entered is of a predeterminable length, with a Main nozzle for inserting the weft into an open shed, which main nozzle can be fed with a transport medium, and with a cutting device for cutting the weft on the Edge facing the main nozzle.
  • Means are provided to: pulling off the weft thread to be inserted every working cycle interrupt at least once, such that first a first Predefinable thread length released for pulling off the winding drum and then at least one more predefinable one Thread length for pulling off the winding drum is released.
  • the means preferably comprise a first and a second Thread stopper to interact with the winding drum and one Control unit, wherein the control unit after removing the first Thread length the first thread stopper with the winding drum in Brings active connection, so that further pulling is prevented, and to provide the further thread length, the operative connection between the first thread stopper and the winding drum releases, so that the further Thread length is withdrawn from the winding drum until the operative connection another between the second thread stopper and the winding drum Peeling prevented.
  • the thread stopper (41, 42) is close to the outer one Circumferential surface of the winding drum (3) are arranged and with respect to the Have an adjustable angular distance from one another in the circumferential direction. This measure allows the thread length to be set in a simple manner adjust and z. B. adapt to the properties of the weft
  • the invention is particularly suitable for weaving with relatively elastic Weft yarns. This means that the weft thread is one when it is inserted experienced relative elongation of at least one percent. The relative Elongation can also be more. Due to the possibility of The weft is relaxed, for example, before cutting no danger of the weft thread jumping out of the main nozzle.
  • the invention is particularly suitable for weaving Carpet backing.
  • Here is usually used as a weft Polypropylene material used.
  • the invention is particularly good for very large weaving widths of for example more than four meters, in particular more than five meters suitable.
  • weaving widths for example more than four meters, in particular more than five meters suitable.
  • one must considerable pulling force is exerted on the weft thread, so that this undergoes a very large elastic stretch. Due to the possibility of respective relaxation of the weft thread e.g. before the end of the entry and / or before cutting can also be unwanted Avoid machine stops.
  • Fig. 1 shows a schematic representation of essential parts of a Jet loom, especially an air jet loom, as a whole is designated by the reference numeral 1, and an embodiment of a Device according to the invention for weft insertion comprises.
  • Per se well-known components of the air jet machine such as the drive, Warp beam, take-off, weft spools are for the sake of better Overview not shown.
  • the device according to the invention for weft insertion comprises one Thread delivery device 2 with a winding drum 3.
  • FIG. 2 shows one Front view of the thread delivery device 2.
  • the winding drum 3 is stationary arranged.
  • a winding device not recognizable in this illustration pulls the thread from a thread spool (not shown) and puts it in Form of several windings as thread supply F on the outer From the outer surface of the winding drum 3. From the front as shown
  • the end of the winding drum 3 is the thread supply F as a weft thread S1 removable and passes through a guide element 5 to the nozzles for the Weft insertion.
  • the weft is inserted by means of air.
  • the embodiment shown here are for accelerating the provided weft thread two nozzles arranged in series, namely a pre-nozzle 10 and a main nozzle 11 (this is in Fig. 1 in two different positions A, B shown, which will be explained later becomes). Both nozzles are fed with air.
  • Weave widths have proven their worth, two on the weft side arranged nozzles 10 and 11 to provide, because of this measure the distance over which the weft thread S1 can be accelerated, enlarge.
  • the weft thread S1 is opened Shed 17 entered.
  • the shed 17 is in a known manner a plurality of warp threads K are formed.
  • auxiliary or relay nozzles (not shown) arranged which the entry of the weft S1 through the shed 17th support.
  • a sley strikes 12 Weft thread to the fabric G, as is the double arrow 14 in FIG. 1 suggests.
  • the warp threads become K crossed, as indicated by the arrows 15.
  • the just inserted weft thread S1 with a cutting device 16 on the side facing the main nozzle 11 Cut the fabric edge so that a new thread start for the next Weft entry is ready.
  • weft yarns S and warp yarns K are woven Fabric G made.
  • the pre-nozzle 10 is arranged stationary with respect to the machine, while the main nozzle 11 is arranged so that it is synchronous with the sley 12 moves.
  • the main nozzle 11 can be directly on the sley 12 be attached.
  • both nozzles 10 and 11 can be stationary with respect to the Machine 1 may be arranged or both movably mounted with the sley his. It is also possible to dispense with the front nozzle 10 and / or one to provide longer main nozzle 11.
  • Fig. 1 the weft thread S1 to be entered, the main nozzle 11 and the Shade 12 shown in two positions A and B, which the Reversal points correspond to the oscillating movement of the sley 12.
  • the sley In the position marked A, the sley is at its most distant Position of tissue G.
  • This position A includes the solid Representation of the weft thread S1.
  • the position labeled B too who owns the dot-dashed representation of the weft thread S1, beats the Wade 12 the shot just entered on the edge of the goods Fabric G. You can see the moving of the main nozzle 11 with the Sley 12 between positions A and B.
  • the thread feeding device 2 comprises a first thread stopper 41 and a second thread stop 42. Both thread stops 41, 42 are each designed such that they further pull the thread from the Prevent winding drum 3 as soon as it is in operative connection with the Winding drum 3 are brought.
  • the thread stoppers 41 are preferably 42 arranged in the vicinity of the outer peripheral surface of the winding drum 3 and operated electromagnetically.
  • the one shown in Fig. 1 and Fig. 2 Embodiment of the thread feeding device 2 is an annular one Bracket 6 is provided, which is the front end as shown (Discharge side) concentrically surrounds the winding drum 3.
  • the Thread stopper 41.42 installed at the the Winding drum 3 facing the inner surface of the bracket 6 .
  • the thread stoppers 41 and 42 are relative to the outer peripheral surface of the winding drum 3 in different Angular positions can be fixed. Hence the angular distance between the two Thread stopper 41.42 - shown in the drawing by the arc length X - adjustable relative to each other.
  • the second thread stopper 42 is in Thread take-off direction arranged in front of the first thread stopper 41. It it goes without saying that of course more than two thread stoppers 41, 42 on the Bracket can be provided. Such an embodiment is in Explained in connection with Fig. 6.
  • Each thread stopper 41, 42 comprises an electromagnetically actuable pin 411 or 421 which is movable in the radial direction of the winding drum 3.
  • a plurality of bores 31 are arranged opposite one another in the Circumferential surface of the winding drum 3 is provided, each for Interacting with a pin 411,421 are designed.
  • Bores 31 can also be provided with an annular groove in order to provide a stepless To allow displacement of the thread stopper 41.42.
  • a control unit 20 is used to control the thread stoppers 41, 42 provided which via signal lines 21, 22 with the thread stoppers 41, 42 is connected to their actuation.
  • the control unit 20 can in the Overall control of the weaving machine 1 can be integrated or in the control the thread feed device 2.
  • the control unit 20 receives input signals, which are summarily indicated in FIG. 1 by the signal line 23.
  • the For example, input signals include signals that are correct Show arrival of weft S1 or other sensor signals.
  • the control unit 20 determines the for each thread stopper Times when the operative connection with the winding drum 3 is established or should be solved, and transmits the corresponding control signals via the signal lines 21 and 22 to the thread stoppers 41, 42.
  • a weft thread is first inserted predefinable first thread length, which depends on the weaving width, on the Pulled up the winding drum 3 and into the open by means of the nozzles 10, 11 Shed 17 entered.
  • both thread stoppers 41 and 42 by one corresponding signal from the control unit 20 in operative connection with the Brought winding drum 3.
  • Pins 411 and 421 penetrate each of them opposite bores 31 of the winding drum 3. The one from the Winding drum 3 coming thread is then on pin 411 of the first Thread stopper 41 and can not be removed.
  • the control unit 20 triggers the Active connection between the first thread stopper 41 and the Winding drum 3. Now thread from the winding drum 3 be withdrawn, namely until the thread on pin 421 of the second thread stopper 42 (dashed line), which is still in Active connection with the winding drum 3 is located. Through this measure the second thread length is released, the length of which is given by the arc length X is determined. This second thread length serves to pre-weft to relax the cutting and at least its elastic stretch to reduce.
  • the Weft thread S1 After the second thread length has been released and thereby the inserted weft thread S1 is relaxed, the Weft thread S1 by means of the cutting device 16 on the main nozzle cut adjacent goods edge so that again a new one Thread start is ready for the next weft insertion.
  • the weft entry becomes the active connection in the subsequent weaving cycle released between the second thread stopper 42 and the winding drum 3.
  • first and second thread stoppers 41 and 42 respectively at the same time with the winding drum 3 in operative connection bring, it is essential that they have an active connection between the second Thread stopper 42 and winding drum 3 exists when the Active connection between the first thread stopper 41 and the Winding drum 3 is released.
  • the length of the second thread length after each weft insertion and before each cutting is released to relax the thread is about the relative angular distance of the two thread stoppers 41 and 42 to one another, that is dimensioned or adjusted over the arc length X and to the respective Conditions, e.g. B. modulus of elasticity of the weft thread, elongation of the Weft, force acting on the weft etc. adjusted.
  • each thread feed device 2 can be set individually for the associated weft yarn.
  • This embodiment is particularly suitable for weaving with elastic weft threads, for example for the production of Carpet backing, where typically polypropylene weft is used, and / or for very large weaving widths of four meters and more, in which strong tractive forces through the transport medium on the Weft are exercised.
  • the release of the at least one further thread length can depend on the desired effect at different points in the working cycle of the Loom 1 take place.
  • 3 shows one for a better understanding schematic representation of the working cycle of an air jet loom 1.
  • the duty cycle is determined by the angle of rotation Main shaft of the machine described. This angle is in Fig. 3 on the Axis MW removed. Two working cycles are shown, which are each extend from 0 ° to 360 °. In the present example, the zero point is thus 0 ° or 360 °, the point in time or the angle at which the sley 12 the S1 weft thread hits the fabric.
  • the curve E shows strongly simplifies the compressed air flow in the main nozzle 11.
  • the weft insertion is finished, the main nozzle 11 becomes with the lower holding pressure HD.
  • the registered weft thread on fabric G this happens usually overlapping with the change of subject.
  • the further thread length is preferably released within one Phase, which begins before the insertion of the weft is finished, and which phase ends after entering the following Weft has started.
  • This phase P is shown in FIG. 3.
  • the further thread length is released at one Angle that lies between 0 ° and C.
  • the further Thread length can, for example, before the end of the weft insertion be released, e.g. B. at the angle D.
  • the two thread stoppers 41 and 42 are then in operative connection with brought the winding drum 3, whereby the first thread length is limited.
  • the first thread stopper 41 is then released, causing a additional thread length for pulling off the winding drum is released.
  • the further thread length is determined by the position of the second one Thread stopper 42 dimensioned so that it is complete for the Weft entry is sufficient.
  • the measure has the advantage that the The weft thread is braked more gently, causing stop knocks or Stretch marks can be avoided.
  • Another variant is one or more thread lengths release after the insertion of the weft is finished and before the weft is completely changed into the fabric by changing the subject is involved, i.e. in the range of 0 °.
  • the registered weft is relaxed while striking, but still before it complete integration by crossing the warp threads.
  • targeted relaxation of the weft thread before its integration into the Tissue can be the transverse tension of the fabric and thus Reduce entry.
  • the variant is possible, one or the further thread length after the Cutting the inserted weft and before the start of the Entry of the following weft to release the beginning of the Weft from the main nozzle to the start of the entry channel transport.
  • the further thread length is thus released between C. and W1.
  • FIG. 4 shows a detail Fig. 1 represents.
  • the front and the main nozzle 10, 11 can be seen to be entered weft S1, the beginning of the sley 12 and the Start of entry channel 18. After the previous weft was cut on the entry side, the beginning of the new weft thread held in the main nozzle 11 by the holding air flow (holding pressure HD).
  • the thread start is typically in the area of the Goods edge facing the outlet of the main nozzle 11.
  • This variant can also be used to prevent unwanted stops Avoid weaving machines.
  • FIG. 5 shows a side view of the front End of the winding drum 3, from which the weft thread S1 is drawn off becomes.
  • the thread supply is in the form of several windings F1, F2, F3, F4 wound on the winding drum 3.
  • the situation shown in Fig. 5 corresponds, for example, to the state after the end of Weft insertion.
  • the weft S1 was in the direction of the arrow from the Pulled winding drum 3 and is now on a thread stopper, here on Pin 411 of the first thread stopper 41.
  • the second thread stopper 42 whose pin in the illustrated Hole 31 engages.
  • Thread stoppers are provided.
  • Fig. 6 shows parts of another in a schematic representation Embodiment of a thread delivery device 2.
  • Thread stopper 41, 42, 43, 44 for interaction with the winding drum 3 intended.
  • the angular distance with respect to the circumferential direction between Adjacent thread stoppers are preferably adjustable, in a similar manner same way as explained above.
  • the active connection becomes successive loosened between the thread stoppers 41-44 to successively more Release thread lengths for take-off.
  • Fig. 6 is particularly suitable also for those applications where different Weft lengths are worked. For example, there are fabrics at which only every second shot after it has been entered into the fabric edge is inserted. Accordingly, an entry is always made alternately with longer weft length (long weft) and an entry with a smaller one Weft thread length (short weft).
  • the thread stoppers 41 and 43 as described above for the short shots are used and the thread stoppers in an analogous manner 42 and 44 for the long shots.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP03405202A 2002-04-11 2003-03-25 Procédé et dispositif pour l'insertion de la trame dans un métier à tisser à jet Withdrawn EP1375716A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03405202A EP1375716A1 (fr) 2002-04-11 2003-03-25 Procédé et dispositif pour l'insertion de la trame dans un métier à tisser à jet

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP02405290 2002-04-11
EP02405290 2002-04-11
EP03405202A EP1375716A1 (fr) 2002-04-11 2003-03-25 Procédé et dispositif pour l'insertion de la trame dans un métier à tisser à jet

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EP1375716A1 true EP1375716A1 (fr) 2004-01-02

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4541462A (en) * 1982-12-10 1985-09-17 Aktiebolaget Iro Weft yarn storing, feeding and measuring device, preferably for jet weaving machines
EP0264985A1 (fr) * 1986-09-23 1988-04-27 Picanol N.V. Procédé et dispositif pour régler la longueur des fils de trame à insérer dans la foule d'un métier à tisser
EP0561218A1 (fr) * 1992-03-16 1993-09-22 Lindauer Dornier Gesellschaft M.B.H Procédé et dispositif pour la présentation d'une réserve de fil de trame fixée en cas d'arrêt de tissage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4541462A (en) * 1982-12-10 1985-09-17 Aktiebolaget Iro Weft yarn storing, feeding and measuring device, preferably for jet weaving machines
EP0264985A1 (fr) * 1986-09-23 1988-04-27 Picanol N.V. Procédé et dispositif pour régler la longueur des fils de trame à insérer dans la foule d'un métier à tisser
EP0561218A1 (fr) * 1992-03-16 1993-09-22 Lindauer Dornier Gesellschaft M.B.H Procédé et dispositif pour la présentation d'une réserve de fil de trame fixée en cas d'arrêt de tissage

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