WO2015177155A1 - Dispositif d'étirage pour un fil de trame - Google Patents

Dispositif d'étirage pour un fil de trame Download PDF

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Publication number
WO2015177155A1
WO2015177155A1 PCT/EP2015/061004 EP2015061004W WO2015177155A1 WO 2015177155 A1 WO2015177155 A1 WO 2015177155A1 EP 2015061004 W EP2015061004 W EP 2015061004W WO 2015177155 A1 WO2015177155 A1 WO 2015177155A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
blowing nozzle
jet
stretching device
weft thread
Prior art date
Application number
PCT/EP2015/061004
Other languages
English (en)
Inventor
Marnix Ghesquiere
Original Assignee
Picanol
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 filed Critical Picanol
Priority to CN201580026451.5A priority Critical patent/CN106460260B/zh
Priority to EP15723937.7A priority patent/EP3146101B1/fr
Publication of WO2015177155A1 publication Critical patent/WO2015177155A1/fr

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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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/308—Stretching or holding the weft
    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • D03D47/278—Guide mechanisms for pneumatic looms

Definitions

  • This invention relates to a stretching device for stretching a weft thread that has been inserted into a weaving shed in a weaving machine, wherein the stretching device is arrangeable opposite to a U-shaped insertion channel of a reed.
  • the invention further relates to a weaving machine comprising a stretching device and a method for stretching a weft thread.
  • a stretching device for stretching a weft thread is arranged at the end of the weaving shed of a weaving machine in order to catch and keep taut a weft thread inserted into the weaving shed. This allows amongst others to avoid that an inserted weft thread springs back or rebounds into a weaving shed at the end of the weft thread insertion. This also allows to keep the weft thread taut when beating up the weft thread.
  • Stretching devices that are arrangeable opposite to a U-shaped insertion channel of a reed to blow on an end of an inserted weft thread are known amongst others from CS 262455 B1 .
  • US 4,487,236 shows a pneumatic weaving machine with a number of relay nozzles, wherein a component of an air jet from said relay nozzles is directed transverse to a weft thread insertion direction, further named as an insertion direction, in order to influence a stretching.
  • a stretching device comprising a first blowing nozzle for providing a first air-jet acting on an end region of an inserted weft thread and a second blowing nozzle for providing a second air-jet acting conjointly, in other words together with the first air-jet on the end region of the inserted weft thread, which second blowing nozzle is arranged in insertion direction downstream of the first blowing nozzle, wherein the second air-jet forms a wider angle with the insertion direction than the first air-jet.
  • the weft thread is transported through the insertion channel by means of a main nozzle device and a number of relay nozzles.
  • the stretching device is arranged downstream of relay nozzles. In contrast to the relay nozzles blowing sequentially on regions of the weft thread transported through the weaving shed, the two air-jets act conjointly on an end region of the inserted weft thread.
  • the stretching device works together with the reed towards which the weft thread is forced by means of the air-jets.
  • no additional mechanical clamping elements are provided. Therefore, a weft thread can easily enter the stretching device and easily leave the stretching device after the weft thread has been beaten up.
  • Such a stretching device is also particularly advantageous as there is no risk that a weft thread is caught by the stretching device.
  • the stretching device is particularly advantageous for weaving smooth filament weft threads that require a relative high force in order to be kept taut.
  • the air-jet discharged from an outflow aperture usually diverges with the distance from the outflow aperture.
  • the direction of the air-jet is defined as its main outflow direction.
  • the first air-jet and the second air-jet both have a component in the insertion direction and a component transverse to the insertion direction.
  • the second air-jet has a larger component transverse to the insertion direction than the first air-jet.
  • a stretching device offers the advantage that during stretching of a weft thread the airflow in the insertion channel coming from the main nozzle device and the relay nozzles is supported by the air-jet from the first blowing nozzle forming a smaller angle with the insertion direction and that the air-jet from the second blowing nozzle forming a wider angle with the insertion direction blows the weft thread towards the reed, wherein the air-jets conjointly act on the weft thread in order to stretch and keep taut that weft thread.
  • the orientation of the air-jets of the stretching device is preferably chosen, so that the air-jets from both blowing nozzles of the stretching device as little as possible disturb the airflow through the insertion channel, so that the airflow through the insertion channel can continue its flow and can provide an additional force to stretch a weft thread.
  • Providing two air-jets allows acting with a sufficient stretching force on the weft thread. Due to this stretching force the weft thread is kept under tension by the resulting airflow that acts on the end region of the weft thread, even if the end region of the weft thread onto which the air-jets of the stretching device directly act is relatively short.
  • the stretching device according to the invention can exert sufficient force on a short end region, the advantage is obtained that the waste end of the inserted weft thread can be kept small, for example an end region in insertion direction smaller than 30mm past the stretching device.
  • Using such a stretching device allows blowing on the weft thread in a region between the woven fabric and a waste band, this also allows keeping a waste end small.
  • the first blowing nozzle and the second blowing nozzle are aligned in a direction parallel to the insertion direction. It is known from the prior art, for example from WO 2008/031519 A1 , to provide an elongate fabric support having a projecting lip portion, which fabric support is fixed to a frame of the weaving machine.
  • the alignment allows arranging both blowing nozzles in such a manner that they both pass beneath a fabric support for the woven fabric when they are moved together with a sley towards the fabric support, even in case the fabric support comprises a protruding lip portion as shown in WO 2008/031519 A1 .
  • the second blowing nozzle is arranged lower than the first blowing nozzle in a direction perpendicular to the insertion direction in order to avoid that the second blowing nozzle reaches into the first air-jet.
  • the first air-jet and the second air-jet act conjointly on the end region of the inserted weft thread.
  • the air-jets reach the weft thread at adjacent, but different positions of the end region of the inserted weft thread.
  • the second air-jet merges with the first air-jet.
  • the first blowing nozzle and the second blowing nozzle are arranged sufficiently close to one another for allowing the second air-jet to merge with the first air-jet.
  • the first blowing nozzle and the second blowing nozzle are arranged sufficiently close to one another a required space is small, and a space for arranging further elements, for example weft detectors is not affected.
  • a higher force is applied compared to a device using one blowing nozzle of the same dimension that is oriented to provide an air-jet in the resulting direction.
  • the first blowing nozzle comprises a first outflow aperture and the second blowing nozzle comprises a second outflow aperture, wherein a plane of the second outflow aperture forming a wider angle with a plane perpendicular to the insertion direction than a plane of the first outflow aperture.
  • a plane of the outflow aperture is perpendicular to the air- jet.
  • the first outflow aperture and the second outflow aperture comprise a plurality of small outflow holes.
  • blowing nozzles having between eleven and sixteen small outflow holes are provided.
  • the first outflow aperture is arranged closer to the U-shaped insertion channel than the second outflow aperture.
  • a first angle that the first air-jet forms with the insertion direction M is about 15° to about 25° and/or a second angle that the second air-jet forms with the insertion direction M is about 20° to about 45°.
  • the second blowing nozzle blows sufficiently towards the reed to prevent springing back of the weft thread after the weft thread has been stretched.
  • Suitable angles of the air-jets depend on different weaving parameters and may be different for different weaving conditions. In an embodiment, for example, an optimum stretching force is obtained with a first angle of about 20° and a second angle of about 27° with respect to the insertion direction. This orientation offers the advantage that the resulting air-jet acts sufficiently on the end region of the weft thread in order to stretch that weft thread, without the end region of the weft thread being blown considerably against the back of the reed.
  • the first blowing nozzle and the second blowing nozzle are formed as a unit.
  • a unit is for example a blowing tube with two outflow apertures near the top portion of the unit, wherein the outflow apertures provide two air-jets differing in orientation.
  • either or both of the first blowing nozzle and the second blowing nozzle are formed as a hollow needle with an outflow aperture near the tip of the hollow needle.
  • the first blowing nozzle and the second blowing nozzle are identical in construction with each other and, preferably, also with the relay nozzles used in the weaving machine. This allows for a cost-efficient manufacturing.
  • the blowing nozzles are arranged with different orientations with respect to a plane perpendicular to the insertion direction.
  • the first blowing nozzle and the second blowing nozzle are supplied together with compressed air.
  • both blowing nozzles always blow at least almost at the same time and with at least almost the same pressure.
  • This offers the advantage that a direction of the resulting air-jet from both blowing nozzles remains mainly the same independent of a pressure of the compressed air supplied.
  • the first blowing nozzle and the second blowing nozzle are connected to a compressed air source via two supply ducts arranged in parallel.
  • This allows for a cost- efficient manufacturing as supply ducts used for the relay nozzles may also be used for the stretching device.
  • the first blowing nozzle and the second blowing nozzle are mounted on a holder, wherein the holder comprises two supply ducts for a supply of compressed air, leading to a common air chamber to which air chamber both blowing nozzles are connected.
  • the stretching device comprises at least one additional blowing nozzle for providing an additional air-jet acting conjointly with the first air-jet and the second air- jet on the end region of the inserted weft thread, which additional blowing nozzle is arranged in insertion direction downstream of the second blowing nozzle, wherein the additional air-jet forms a wider angle with the insertion direction than the second air-jet.
  • additional blowing nozzles allows applying a higher blowing force.
  • the dimension of the stretching device in the insertion direction is increased.
  • a suitable number of blowing nozzles can be chosen by the person skilled in the art in accordance with boundary conditions of the weaving machine.
  • a weaving machine comprising a reed with a U-shaped insertion channel and a stretching device for stretching a weft thread arranged opposite to the U-shaped insertion channel, which stretching device comprises a first blowing nozzle for providing an first air-jet acting on an end region of an inserted weft thread and a second blowing nozzle for providing a second air-jet acting conjointly with the first air-jet on the end region of an inserted weft thread, which second blowing nozzle is arranged in insertion direction downstream of the first blowing nozzle, wherein the second air-jet forms a wider angle with the insertion direction than the first air-jet.
  • the stretching device can be arranged at any type of weaving machine having a reed that is provided with a U-shaped insertion channel.
  • the stretching device is fixed to a sley of the weaving machine adjustable in position in the length direction of the reed.
  • the stretching device can be arranged in any position with respect to the reed, for example, a position adjusted to the weaving width of the fabric to be woven.
  • the position of the stretching device in the insertion direction can easily be adjusted.
  • a continuous reed is provided, i.e. a reed that extends beyond the fabric edge of the woven fabric, in particular even beyond a waste band woven next to the woven fabric.
  • a method for stretching a weft thread that has been inserted into a weaving shed in a weaving machine by means of a stretching device arranged opposite to a U-shaped insertion channel of a reed, wherein the stretching device comprises a first blowing nozzle for providing an first air-jet acting on an end region of an inserted weft thread and a second blowing nozzle for providing a second air-jet acting conjointly with the first air-jet on the end region of an inserted weft thread, which second blowing nozzle is arranged in insertion direction downstream of the first blowing nozzle, wherein the second air-jet is discharged at a wider angle with the insertion direction than the first air-jet.
  • Fig. 1 shows schematically and in perspective a part of an airjet weaving machine with a stretching device according to the invention
  • Fig. 2 shows the stretching device of Fig. 1 in a front view with respect to the reed
  • Fig. 3 shows the stretching device of Fig. 1 in a top view with respect to the reed
  • Fig. 4 shows an arrangement of the stretching device of Fig. 1 with respect to a fabric support
  • Fig. 5 shows an enlarged front view of a stretching device
  • Fig. 6 shows an enlarged perspective view of a stretching device
  • Fig. 7 shows a partial cross sectional view of the stretching device of Fig. 5;
  • Fig. 8 shows an alternative of Fig. 7
  • Fig. 9 shows an alternative arrangement of the stretching device of Fig. 1 in an air-jet weaving machine
  • Fig. 10 shows an alternative of the stretching device of Fig. 7;
  • Fig. 1 1 shows an alternative of the stretching device of Fig. 5.
  • Figs. 1 to 7 show a first embodiment of a stretching device 3, wherein Figs. 1 to 4 show the stretching device 3 together with further elements of a weaving machine, and Figs. 5 to 7 show the stretching device 3 by itself.
  • a part of a reed 1 one of a number of relay nozzles 2 and a stretching device 3 for stretching a weft thread 6 are shown.
  • the reed 1 comprises a number of lamellae 4 with a U-shaped profiling that are arranged next to one another and that form together a U-shaped insertion channel 5, as shown in Fig. 4.
  • the stretching device 3 comprises a first blowing nozzle 1 1 providing a first air-jet 31 acting on an end region 36 of the inserted weft thread 6 and second blowing nozzle 15 providing a second air-jet 35 acting conjointly, in particular simultaneously with the first air-jet 31 on the end region 36 of an inserted weft thread 6, which second blowing nozzle 15 is arranged in insertion direction M downstream of the first blowing nozzle 1 1 .
  • the stretching device 3 cooperates with the reed 1 in order to keep an inserted weft thread 6 taut.
  • the reed 1 is a continuous reed that extends farther than a fabric edge (not shown).
  • the blowing nozzles 1 1 , 15 of the stretching device 3 are arranged closer to the U-shaped insertion channel 5 of the reed 1 than the relay nozzles 2. This arrangement of the stretching device 3 allows a higher force to act on the weft thread 6.
  • a weft thread 6 is inserted into a weaving shed 32, shown in Fig. 4, by means of an airflow in the U-shaped insertion channel 5, which airflow transports the weft thread 6 through the U-shaped insertion channel 5 of the reed 1 .
  • This airflow is generated by a main nozzle (not shown) and by the number of relay nozzles 2 that are arranged one after the other in an insertion direction M and are mounted on the sley 7.
  • the inserted weft thread 6 moves in the insertion direction M through the U-shaped insertion channel 5 in the direction towards the stretching device 3 and beyond the stretching device 3.
  • the inserted weft thread 6 is held by the stretching device 3 to prevent the weft thread 6 from springing back or rebounding.
  • the stretching device 3 blows on the weft thread 6.
  • the inserted and stretched weft thread 6 is bound in a known way by warp threads 43, 44 and beaten up by the reed 1 at the height of the U-shaped insertion channel 5.
  • the stretching device 3 is in preferred embodiments activated to start blowing at about 240° and is deactivated at about 350°.
  • the stretching device 3 already blows when the weft thread 6 arrives at the stretching device 3 and the stretching device 3 continues to blow until the weft thread 6 is bound by the warp threads 43, 44 or is beaten up.
  • at least the relay nozzles 2 next to the stretching device 3 continue to blow for at least a first part of the time period in which the blowing nozzles 1 1 and 15 of the stretching device 3 are blowing.
  • the first blowing nozzle 1 1 and the second blowing nozzle 15 both discharge an air-jet acting on the weft thread 6. As can be seen in Figs. 1 to 7, in particular Fig.
  • the second air-jet 35 discharged by the second blowing nozzle 15 forms an angle B with the insertion direction M that is wider than the angle A that the first air-jet 31 discharged by the first blowing nozzle 1 1 forms with the insertion direction M.
  • the first air-jet 31 is oriented more towards the insertion direction M than the second air-jet 35.
  • the first blowing nozzle 1 1 is arranged to generate a first air-jet 31 which is essentially directed in the insertion direction M, for example the angle A between the first air-jet 31 and the insertion direction M is less than 20°.
  • the angle B between de second air-jet 35 and the insertion direction M is for example wider than 27°.
  • the first blowing nozzle 1 1 is formed as a first hollow needle 12 with a first lateral outflow aperture 13 provided near the tip 14 of the first hollow needle 12.
  • the second blowing nozzle 15 is formed as a second hollow needle 16 with a second lateral outflow aperture 17 provided near the tip 18 of the second hollow needle 16.
  • Both lateral outflow apertures 13, 17 are formed by a plurality of small outflow holes, for example small outflow holes as known from US 3,978,896. As can be best seen in Fig.
  • a plane 48 of the first outflow aperture 13 and a plane 49 of the second outflow aperture 17 are both slightly inclined with respect to a middle axis of the respective hollow needle 12, 16 and the air-jets 31 and 35 extend essentially perpendicular with respect to the respective plane 48, 49.
  • the first blowing nozzle 1 1 and the second blowing nozzle 15 are identical in construction. However, the first blowing nozzle 1 1 and the second blowing nozzle 15 are oriented in different directions so that the planes 48, 49 of the first outflow aperture 13 and the second outflow aperture 17, respectively are not in parallel. In this case the air-jets 31 and 35 discharged at the first outflow aperture 13 and at the second outflow aperture 17 are not in parallel, and the second air-jet 35 forms a wider angle with the insertion direction M than the first air-jet 31 .
  • the first blowing nozzle 1 1 and the second blowing nozzle 15 are arranged on a holder 8.
  • the holder 8 comprises a first mounting surface 40 to which the first blowing nozzle 1 1 is mounted.
  • the holder 8 also comprises a second mounting surface 41 that is directed inclined with respect to the first mounting surface 40 and to which the second blowing nozzle 15 is mounted.
  • the first blowing nozzle 1 1 and the second blowing nozzle 15 are arranged on the holder 8 in such a manner that the plane 49 of the second outflow aperture 17 forms a wider angle with a plane perpendicular to the insertion direction M than the plane 48 of the first outflow aperture 13.
  • An inclined arrangement defines the difference in orientation of the first air-jet 31 discharged and the second air-jet 35 discharged.
  • the orientation of the planes 48 and 49 and thus also the direction of the air-jets 31 and 35 can be set by rotating the first hollow needle 12 and/or the second hollow needle 16 around their length axis with respect to the holder 8.
  • the second mounting surface 41 is arranged so that the second blowing nozzle 15 is arranged lower than the first blowing nozzle 1 1 on the holder 8.
  • the second blowing nozzle 15 is arranged in such manner that its tip 18 does not reach into the first air-jet 31 .
  • the first blowing nozzle 1 1 is arranged closer to the U-shaped insertion channel 5 than the second blowing nozzle 15.
  • Fig. 1 upon mounting the stretching device 3 to the weaving machine, the first blowing nozzle 1 1 is arranged closer to the U-shaped insertion channel 5 than the second blowing nozzle 15.
  • Fig. 1 upon mounting the stretching device 3 to the weaving machine, the first blowing nozzle 1 1 is arranged closer to the U-shaped insertion channel 5 than the second blowing nozzle 15.
  • the first blowing nozzle 1 1 and the second blowing nozzle 15 are aligned in a direction 51 , which upon mounting the stretching device 3 coincides with the insertion direction M, in other words the first blowing nozzle 1 1 and the second blowing nozzle 15 are arranged in a direction 51 , which direction 51 is parallel to the insertion direction M.
  • the first blowing nozzle 1 1 and the second blowing nozzle 15 of the stretching device 3 are arranged, in particular in a direction 51 as shown in Fig. 3, so that the stretching device 3 can pass beneath a lip portion 38 of the fabric support 39.
  • the holder 8 is provided with an air chamber 9.
  • the air chamber 9 is connected to a compressed air source 22 via two supply ducts 19 and an associated shut off valve 20.
  • two supply ducts 19 are provided. This allows supplying sufficient compressed air to the stretching device 3 while using supply ducts having a small diameter, in particular using supply ducts as commonly used for the relay nozzles 2.
  • compressed air is supplied to the air chamber 9 via only one supply duct, the diameter of which is chosen sufficiently large.
  • the holder 8 is fixed by means of two identical fixation elements 10 onto the sley 7.
  • the holder 8 is an essentially cuboidal block comprising a tongue 23 protruding from a side facing the sley 7.
  • a reed beam 21 provided on the sley 7 has a groove, and the tongue 23 is clamped between a key 24 and the reed beam 21 for fixing the holder 8 to the sley 7.
  • the fixation elements 10 are for example embodied similar as the known fixation elements for a relay nozzle 2, for example as known from US 5,020,574.
  • the fixation elements 10 shown allow arranging the stretching device 3 in a desired position along the reed 1 , wherein the distance of the stretching device 3 with respect to the U-shaped insertion channel 5 of the reed 1 remains retained.
  • a desired position is for example determined by the weaving width.
  • Such a holder 8 to which both blowing nozzles 1 1 , 15 are mounted also allows a compact construction.
  • the stretching device 3 offers the advantage that the weft thread 6 and the airflow in the U-shaped insertion channel 5 due to the blowing action of the main nozzles and the relay nozzles 2 can pass almost unhindered beyond the stretching device 3, in other words the weft threads 6 inserted can continue almost unhindered their linear movement. In this way, the airflow in the U-shaped insertion channel 5 is used to provide an additional stretching force. This offers the additional advantage that a sufficient stretching force can be obtained with reduced air consumption.
  • compressed air is supplied to the first blowing nozzle 1 1 via a first air chamber 46 and to the second blowing nozzle 15 via a second air chamber 47. This allows to provide the blowing nozzles 1 1 and 15 separately with compressed air.
  • Fig. 9 shows a second embodiment of using the stretching device 3 as shown in Figs. 5 to 7 in a weaving machine.
  • the stretching device 3 is arranged next to a woven fabric 33 and between the woven fabric 33 and a waste band 34.
  • Such an arrangement between the woven fabric 33 and the waste band 34 is possible, as the stretching device 3 is dimensioned small in the insertion direction M. This offers the advantage that can be woven with a short waste end of weft threads, that is much shorter than in the prior art shown in CS 262455 B1 .
  • a first weft detector 25 is arranged in the insertion direction M upstream the stretching device 3, and as also shown in Fig. 9, a second weft detector 26 is arranged in the insertion direction M downstream the stretching device 3.
  • the stretching device 3 is particularly suitable for being used together with an optical weft detector that is arranged in front of the reed 1 .
  • the stretching device 3 is also advantageous when using a so called weft removal device, for example a weft removal device as known from US 4,898,214.
  • Fig. 10 shows an alternative embodiment of a stretching device 3.
  • the stretching device 3 shown in Fig. 10 is similar to the stretching device 3 shown in Figs. 5 to 7 and identical reference numbers will be used for similar or identical elements.
  • a third or additional blowing nozzle 27 is provided downstream of the second blowing nozzle 15.
  • the third blowing nozzle 27 is formed as a third hollow needle 28 with a third lateral outflow aperture 29 provided near the tip 30 of the third hollow needle 28.
  • a third air-jet 37 is discharged via the lateral outflow aperture 29 in a direction perpendicular to a plane 50 of the third lateral outflow aperture 29.
  • the third blowing nozzle 27 is identical in construction to the first blowing nozzle 1 1 and the second blowing nozzle 15.
  • blowing nozzles 1 1 , 15, 27 are oriented in different directions so that the planes 48, 49, 50 of the first outflow aperture 13, the second outflow aperture 17 and the third outflow aperture 29, respectively are not in parallel.
  • the third blowing nozzle 27 is arranged so that the third air-jet 37 forms a wider angle with the insertion direction M than the second air-jet 35.
  • the third blowing nozzle 27 is mounted on a third mounting surface 42 provided at the holder 8.
  • the third mounting surface 42 is provided so that the third blowing nozzle 27 is arranged lower than the first blowing nozzle 1 1 and the second blowing nozzle 15.
  • the third blowing nozzle 27 is arranged in such manner that its tip 30 does not reach into the first air-jet 31 and/or the second air-jet 35 and the third blowing nozzle 27 does not impede the air- jets 31 and 35 coming from the other blowing nozzles 1 1 and 15.
  • even further blowing nozzles can be provided. Providing additional blowing nozzles allows applying a higher blowing force compared to the embodiment shown in Figs. 1 to 9. However, the dimension of the stretching device 3 in the insertion direction M is increased.
  • the first blowing nozzle 1 1 and the second blowing nozzle 15 are formed as a unit 52.
  • the unit 52 is formed by a blowing tube that is mounted on the holder 8 and that comprises two outflow apertures 13 and 17 near the top portion 54 of the unit 52, wherein the outflow apertures 13 and 17 provide two respective air-jets 31 and 35 differing in orientation.
  • the air-jets 31 and 35 are directed for example as the air-jets 31 and 35 as shown in Fig. 5.
  • the relay nozzles 2 provide an air-jet 55 directed more in insertion direction M than the air-jets 31 , 35 of the stretching device 3, for example the angle A between the air-jet 55 and the insertion direction M is less than 10°.
  • another one or a number of relay nozzles 53 can be provided downstream of the stretching device 3 in order to blow on a faulty inserted weft thread for example.
  • the air-jet 56 can be directed similar as the air-jet 55.
  • the stretching device 3 can be arranged at any type of weaving machine with a reed 1 that is provided with a U-shaped insertion channel 5.
  • the stretching device 3 can also be arranged in the length direction of the reed 1 in any position with respect to the reed 1 , for example, a position adapted to the weaving width of the fabric 33 to be woven.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Abstract

La présente invention concerne un dispositif d'étirage servant à étirer un fil de trame (6) qui a été inséré dans une foule de tissage (32) dans un métier à tisser, dans lequel le dispositif d'étirage (3) est en mesure d'être agencé de manière opposée par rapport à un canal d'insertion en forme de U (5) d'un peigne (1), dans lequel le dispositif d'étirage (3) comporte une première buse de soufflage (11) servant à fournir un premier jet d'air (31) agissant sur une région d'extrémité (36) d'un fil de trame inséré (6) et une deuxième buse de soufflage (15) servant à fournir un deuxième jet d'air (35) agissant conjointement avec le premier jet d'air (31) sur la région d'extrémité (36) du fil de trame inséré (6), la deuxième buse de soufflage (15) étant agencée dans la direction d'insertion (M) en aval par rapport à la première buse de soufflage (11), et dans lequel le deuxième jet d'air (35) forme un angle plus large avec la direction d'insertion (M) par rapport au premier jet d'air (31). L'invention concerne par ailleurs un métier à tisser comprenant un dispositif d'étirage et un procédé servant à étirer un fil de trame.
PCT/EP2015/061004 2014-05-22 2015-05-19 Dispositif d'étirage pour un fil de trame WO2015177155A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201580026451.5A CN106460260B (zh) 2014-05-22 2015-05-19 用于纬纱的拉伸装置
EP15723937.7A EP3146101B1 (fr) 2014-05-22 2015-05-19 Dispositif d'étirage pour un fil de trame

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2014/0397 2014-05-22
BE2014/0397A BE1021879B1 (nl) 2014-05-22 2014-05-22 Strekinrichting voor een inslagdraad

Publications (1)

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WO2015177155A1 true WO2015177155A1 (fr) 2015-11-26

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EP (1) EP3146101B1 (fr)
CN (1) CN106460260B (fr)
BE (1) BE1021879B1 (fr)
WO (1) WO2015177155A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018099662A1 (fr) 2016-11-29 2018-06-07 Picanol Dispositif d'étirement d'extrémités inutilisées destiné à une machine à tisser
WO2020001771A1 (fr) 2018-06-28 2020-01-02 Picanol Support de tissu

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111367326B (zh) * 2020-03-13 2020-09-11 江苏苏云医疗器材有限公司 一种用于牵引装置的力量调控系统及方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978896A (en) 1974-05-21 1976-09-07 Larmit Adrianus Johannes Franc Weft thread inserting nozzle
US4487236A (en) 1979-09-21 1984-12-11 Ruti-Te Strake B.V. Pneumatic weaving machine
CS262455B1 (cs) 1987-04-02 1989-03-14 Radomir Ovcacik Zařízeník napínáníútkové nití
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US4898214A (en) 1987-09-11 1990-02-06 Picanol N. V. Method and apparatus for removing an improperly inserted weft thread from an air-jet loom
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Publication number Priority date Publication date Assignee Title
WO2018099662A1 (fr) 2016-11-29 2018-06-07 Picanol Dispositif d'étirement d'extrémités inutilisées destiné à une machine à tisser
WO2020001771A1 (fr) 2018-06-28 2020-01-02 Picanol Support de tissu
BE1026384A1 (nl) 2018-06-28 2020-01-20 Picanol Nv Weefselsteun

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BE1021879B1 (nl) 2016-01-25
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CN106460260B (zh) 2018-11-13
CN106460260A (zh) 2017-02-22

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