EP3371359B1 - Verfahren zum eintrag eines schussfadens - Google Patents

Verfahren zum eintrag eines schussfadens Download PDF

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Publication number
EP3371359B1
EP3371359B1 EP16781131.4A EP16781131A EP3371359B1 EP 3371359 B1 EP3371359 B1 EP 3371359B1 EP 16781131 A EP16781131 A EP 16781131A EP 3371359 B1 EP3371359 B1 EP 3371359B1
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EP
European Patent Office
Prior art keywords
weft thread
winding
average
instant
prewinder
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EP16781131.4A
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English (en)
French (fr)
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EP3371359A1 (de
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Patrick Puissant
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Picanol NV
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Picanol NV
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    • 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
    • D03D47/3026—Air supply systems
    • D03D47/3033—Controlling the air supply
    • D03D47/304—Controlling of the air supply to the auxiliary nozzles

Definitions

  • the invention relates to a method for inserting a weft thread in an airjet weaving machine, and an airjet weaving machine adapted to apply this method.
  • Airjet weaving machines in which compressed air is supplied to a number of relay blowers in order to transport a weft thread via an air guide channel through a shed are known.
  • Such airjet weaving machines comprise a supply device for supplying compressed air to the relay blowers.
  • Supplying compressed air to a relay blower is effected, for example, by activating during a certain period of time a shut off valve which is disposed between the relay blower and a buffer reservoir comprising compressed air at a specific pressure.
  • EP 164773 A1 and EP 1951941 B1 to provide at least one arrival detector for detecting the arrival of the leading end of an inserted weft thread at the arrival detector. It is also known amongst other from EP 229432 A2 and EP 1951941 B1 to provide at least one winding detector at the height of a prewinder for detecting a part of a weft thread arriving at or passing along the winding detector when a weft thread is drawn off from the winding drum of the prewinder.
  • a method for inserting a weft thread in an airjet weaving machine which weft thread is wound in a number of windings on a winding drum of a prewinder, is drawn off from the prewinder and is transported through a shed by means of compressed air blown by at least one main blower and by successive relay blowers, wherein the method comprises the steps of activating the relay blowers successively, with the advancement of the weft thread through the shed, over a period of time for supporting the weft thread, detecting an average arrival instant T A at which a leading end of an average weft thread reaches an arrival detector arranged at an arrival end of the shed, detecting an instant T LW at which the last winding is unwound from the winding drum, and determining as a reference value DT the time difference between the average arrival instant and the average instant at which the last winding is unwound from the winding drum, and wherein at least one point of an estimated trajectory of the leading end of the average wef
  • the reference value is larger compared to weft threads having a high speed and an earlier arrival instant. This reference value is used to start the supply of compressed air later for weft threads having a slow speed than for weft threads having a high speed.
  • weft threads of different lengths can be inserted resulting in different waste lengths, this means different lengths of the weft thread extending past the woven fabric.
  • a prewinder can be applied that allows a variation in the length of the weft thread to be inserted, such as a prewinder of the type as known from WO 92/01102 wherein the circumferential length of the winding drum can be varied by means of a motor.
  • the different length and the resulting different circumferential length of each winding influences the trajectory of the leading end of the weft thread without significant changes in the arrival instant, wherein this effect is also taken account of by the reference value.
  • the difference T A - T LW can also be a negative value in case the instant at which the last winding is unwound from the winding drum is later than the arrival instant due to a comparatively long waste length.
  • the estimated trajectory is constructed using one point determined as a function of the reference value. In preferred embodiments, several successive points of the estimated trajectory of the leading end of an average weft thread transported through the shed are determined as a function of the reference value.
  • the trajectory of the leading end of the weft thread up to the arrival detector is split into a number of equal intervals and the points of the estimated trajectory are determined in function of endpoints of each interval and the reference value.
  • the reference value has a positive sign or a negative sign, the average instants at which the windings are unwound from the winding drum are used for calculating the points of the trajectory.
  • the constant fraction k i is determined by the person skilled in the art considering the knowledge of weft thread flight characteristics, unwinding effects such as ballooning etc.
  • the average speed of the weft threads may increase or decrease with the thread supply becoming smaller.
  • the average arrival instant and/or the average instant at which the last winding is unwound from the winding drum are continuously updated based on the last N number measurements, in particular the last ten to fifty measurements, more particular the last twenty measurements. It is obvious to the person skilled in the art that for determining the average values, known methods of statistical evaluation can be applied.
  • a diameter of the winding drum of the prewinder is variable, wherein after a variation of the diameter, the average arrival instant and/or the average instant at which the last winding is unwound from the winding drum are determined again. In other words, in case the boundary conditions are varied, the method will be "calibrated".
  • the start of the period of time for supply of compressed air to at least one of the relay blowers is adapted to said estimated trajectory so that said relay blower blows at least almost at full pressure immediately after the leading end of an average weft thread as determined by the estimated trajectory has passed said relay blower.
  • the end of the period of time for supply of compressed air to at least one of the relay blowers is adapted to measurements on the inserted weft threads, wherein the period of time for supply of compressed air to at least one of the relay blowers is ended earlier in case of fast weft threads than in case of slow weft threads.
  • all relay blowers are activated and/or deactivated separately.
  • the relay blowers are grouped in sets, wherein the relay blowers of one set are activated and deactivated conjointly.
  • an airjet weaving machine with a prewinder, at least one main blower and successive relay blowers wherein a weft thread is wound in a number of windings on a winding drum of the prewinder, drawn off from the prewinder and transported through a shed by means of compressed air blown by the at least one main blower and by the successive relay blowers, and wherein a device for applying a method as described above is provided.
  • a prewinder is provided with at least one winding detector for detecting the instants at which the windings are unwound from the winding drum.
  • the prewinder allows to release weft threads of different lengths, in particular the prewinder is provided with a winding drum of which the circumferential length can be varied by means of a motor.
  • FIG. 1 shows a device for transporting a weft thread through a diagrammatically indicated shed 1 of an airjet weaving machine.
  • This device has two supply channels 2, 3 for the supply of weft threads 4, 5.
  • Each supply channel comprises a thread supply 6, a prewinder 7, a first main blower 8 and a second main blower 9.
  • the airjet weaving machine has a reed 10 in which a guide channel 11 is provided which allows a weft thread to be transported through the shed 1 via this guide channel 11 with the aid of compressed air.
  • successive sets of relay blowers 12, 13, 14, 15, 16, 17, 18, 19 and 20 are provided in order to successively support a weft thread with compressed air.
  • an arrival detector 25 is provided for detecting the arrival of the leading end of an inserted weft thread at the arrival detector 25.
  • the arrival detector 25 is arranged at the arrival end of the guide channel 11 which is situated opposite the end of the guide channel 11 where the main blowers 9 are arranged.
  • the instant relative to a reference instant in the weaving cycle at which a leading end of the weft thread 4, 5 reaches the arrival detector 25 is referred to as arrival instant T A .
  • Fig. 1 also shows a winding detector 26 near each prewinder 7, which winding detector 26 transmits a signal to a control unit 35 each time a winding 28 is drawn off from a winding drum of a prewinder 7, more particularly each time a part of a weft thread arrives at or passes along the winding detector 26.
  • a winding detector 26 is also referred to as a winding sensor.
  • the signals from the winding detectors 26 are in this case transmitted to the control unit 35 by means of a wired or wireless connecting line 34.
  • the instant at which a winding 28 arrives at a winding detector 26 is determined relative to the reference instant in the weaving cycle, also named winding time T iW , wherein the index i indicates the successive windings 1, 2, 3, ....
  • the instant at which a last winding 28 arrives at the winding detector 26 is referred to as last winding time T LW .
  • a balloon limiter 27 for limiting the diameter of the weft thread balloon when weft thread is drawn off from the prewinder 7.
  • a thread brake 29 in order to brake a weft thread at the end of the insertion of it.
  • the main blowers 8 and 9 are connected to a compressed-air source 23 via associated shut-off valves 21 and throttle valves 22.
  • Each set of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20 is analogously connected via a shut-off valve 24 and an associated throttle valve 30 to the compressed-air source 23.
  • a separate compressed-air source may be provided for both the main blowers and the relay blowers.
  • a stretching blower 31 is shown which serves to keep a weft thread stretched after the insertion of it.
  • the stretching blower 31 is connected to a compressed-air source 23 via a shut-off valve 32 and a throttle valve 33.
  • a separate compressed-air source may be provided for both the main blowers, the relay blowers and/or the stretching blower.
  • the relay blowers are grouped in sets of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20, each set comprising at least two relay blowers.
  • the shut-off valves 21, 24, 32 and the throttle valves 22, 30, 33 are controlled by the control unit 35 of the airjet weaving machine, as shown in Fig. 1 .
  • the arrival detector 25 and the winding detectors 26 in this case also cooperate with the control unit 35.
  • the shut-off valves for example consist of electromagnetic valves which can be controlled by the control unit 35.
  • the throttle valves can in this case also be designed such that they can be driven by a motor and controlled by the control unit 35.
  • a weft thread 4, 5 is blown into the guide channel 11 by the main blowers 8, 9 and is then transported further along the guide channel 11 by jets of air from the relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20.
  • the guide channel 11 is, for example, arranged in a reed 10 and is disposed in a known way in a shed during the insertion of a weft thread 4, 5.
  • the main blowers 9, the relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20, the reed 10 and the arrival detector 25 are mounted in a known way on a sley (not shown) moving in a reciprocating fashion.
  • the thread supply 6, the prewinders 7, the main blowers 8 and the stretching blower 31, for example, are mounted on a frame of the airjet weaving machine.
  • the arrival detector 25 is, for example, connected to the control unit 35 by means of a wired connecting line 36.
  • the shut-off valves 21, 24, 32 and the throttle valves 22, 30, 33 are connected to the control unit 35 by means of a common wired connecting line 37.
  • Each prewinder 7 comprises a magnet pin 38 in order to release a desired length of weft thread 4 or 5 at a suitable instant in the weaving cycle.
  • the magnet pins 38 and the thread brakes 29 are connected to the control unit 35 via a common wired connecting line 39.
  • the weaving machine also comprises an input unit 50 in order to input parameters into the control unit 35 and a display unit 51 that is connected to the control unit 35 in order to display data.
  • some or all of the wired connecting lines are replaced by a wireless connecting line, in other words a wireless communication link.
  • a part of a prewinder 7 is shown wherein the circumferential length of the winding drum 53 can be varied by means of a motor 52 (shown schematically).
  • the motor 52 is arranged in the frame 61 of the prewinder 7.
  • the winding drum 53 is formed by four fingers 54, 55, 56, 57.
  • the finger 54 that is situated opposite to the magnet pin 38 is fixed to the frame 61 of the prewinder 7 by means of a fixation 58.
  • the winding detector 26 is arranged near the magnet pin 38.
  • the fingers 55, 56, 57 can be displaced radially with respect to the center 62 and each are guided by rods 59, 60, respectively in direction R55, R56, R57.
  • the rods 59 can be driven by the motor 52 in order to vary the circumferential length of the winding drum 53.
  • a weft thread 4 is wound on the winding drum 53 by means of a winding arm 63.
  • Another embodiment of a prewinder with a winding drum and a motor in order to vary the circumferential length of the winding drum is described in WO 92/01102 .
  • the windings 28 are drawn off in the direction R indicated by an arrow in Fig. 2 , wherein when the weft thread 4 is being drawn off a part of the weft thread 4 passes along the winding detector 26 so that the winding detector 26 detects the instant T iW at which the i-th winding is drawn off.
  • the weft thread is wound, for example, in five windings on the prewinder 7 (see Fig. 1 ), five instants T 1W , T 2W , T 3W , T 4W and T LW at which the windings are unwound from the winding drum of the prewinder 7 are detected.
  • Fig. 3 shows schematically an estimated trajectory 49 of a leading end of an average weft thread 4 transported through the guide channel 11 reaching at an average arrival instant T A the arrival detector 25 (see Fig. 1 ), wherein at least one point P i of the estimated trajectory 49 of the leading end of the average weft thread 4, 5 transported through the guide channel 11 is determined as a function of a reference value DT.
  • the abscissa of the diagram shown in Fig. 3 is expressed units of time t and the ordinate is expressed in a distance p along the guide channel 11, wherein the distance L almost corresponds to the length of the guide channel 11 up to the arrival detector 25.
  • the units of time can easily be converted to crank degrees of the main shaft of the weaving machine.
  • one crank degree of the weaving machine corresponds, for example, to a number of milliseconds or one millisecond corresponds to a number of crank degrees.
  • the use of crank degrees is preferred, as in this case the control of the supply of compressed air to the sets of relay blowers can take place independently of the speed of the weaving machine. This is particularly advantageous if successive insertions of weft threads take place at a different speed of the weaving machine, in other words if the speed of the weaving machine is not constant.
  • the weft thread is wound in five windings to the prewinder 7 (see Fig. 1 ), as explained above five instants T 1W , T 2W , T 3W , T 4W , T LW at which the windings are unwound from the winding drum of the prewinder 7 are detected. Also the length L is divided in five length parts and a line 64 is shown based on these five instants T 1W , T 2W , T 3W , T 4W , T LW and these five length parts.
  • at least one point P i of an estimated trajectory of a leading end of an average weft thread 4 transported through the guide channel 11 is calculated.
  • the fraction k i can be determined considering the knowledge about a formation of a balloon in the beginning of the insertion and braking effects at the end of the insertion.
  • the instant at which the supply of compressed air to a set of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20 is determined based on the estimated trajectory 49.
  • the instant to start the supply of compressed air is optimized such that each set of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20 blows almost at full pressure a short time after the leading end of the weft thread as determined by the estimated trajectory 49 has passed by the respective set of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20.
  • Fig. 4 shows a flowchart with blocks 40, 41, 42, 43, 44, 45, 46, 47, 48 indicating in each case a period of time in which one of the sets of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20 respectively, are supplied with compressed air, in other words, a period when the associated shut-off valves 24 (see Fig. 1 ) are opened in order to supply compressed air to an associated set of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20.
  • These blocks are adjoining the line 49.
  • the flowchart as shown in Fig. 4 is, for example, displayed on the display unit 51 that is connected to the control unit 35.
  • the activation of the sets of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20 is adapted to said updated estimated trajectory resulting in a later activation of the sets of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20 in the embodiment shown.
  • the method is particularly suitable to be applied in weaving machines wherein the circumferential length of the windings can be varied.
  • the circumferential length of the windings By varying the circumferential length of the windings, the length of the inserted weft thread is also varied, so that fabrics are woven with more or less waste length.
  • the weft thread length even if the weft thread is inserted with almost constant speed into the shed and an arrival instant remains at least substantially unvaried, the instants at which windings are unwound will be effected. More particular, the instants at which the windings are unwound will be delayed with an increasing winding circumference of the winding drum of the prewinder.
  • the instants at which the windings are unwound will be advanced with a decreasing winding circumference of the winding drum of the prewinder. This because the length of a winding is determined by the circumferential length of the winding drum. Further, according to the findings of the inventor, the winding circumference will also influence a balloon forming near the prewinder. These effects are compensated by the method of the invention as will be explained with reference to Figs. 6 and 7 .
  • Fig. 6 shows a variant of Fig. 3 , wherein, per weaving cycle a slightly longer weft thread is drawn off from the prewinder.
  • the arrival instant T A remains unchanged.
  • a line 64B based on the five instants T 1W , T 2W , T 3W , T 4W , T LW is determined and an estimated trajectory 49B is determined using the reference value DT and the instants T 1W , T 2W , T 3W , T 4W .
  • a line 64C based on the five instants T 1W , T 2W , T 3W , T 4W , T LW is determined and an estimated trajectory 49C is determined using the reference value DT and the instants T 1W , T 2W , T 3W , T 4W .
  • the estimated trajectory 49 is adapted to an estimated trajectory 49B or 49C. This results in the instant at which the supply of compressed air to a set of relay blowers starts with respect to the weaving cycle being advanced for longer weft threads. Similarly, in case a weft thread with a smaller length is released by the prewinder, the instant at which the supply of compressed air to a set of relay blowers starts with respect to the weaving cycle is delayed.
  • the instant at which the supply of compressed air to a set of relay blowers 12, 13, 14, 15, 16, 17, 18, 19, 20 is interrupted can be further determined based on measurements on the inserted weft thread, wherein the period of time indicated by the blocks 40, 41, 42, 43, 44, 45, 46, 47, 48 for the supply of compressed air to at least one set of relay blowers 14, 15, 16, 17, 18 is ended earlier in case of fast weft threads than in case of slow weft threads, as indicated by the shorter blocks 42, 43, 44, 45, 46 than in Fig. 4 .
  • blocks 40, 41, 42, 43, 44, 45, 46, 47, 48 adjoining the line 49 blocks can adjoin the lines 49A, 49B, 49C as shown respectively in Figs. 5 , 6 and 7 .
  • a winding detector 65 can be applied that is arranged at the opposite side of the magnet pin 38 close to the magnet pin 38, as shown in Fig. 2 . It is preferred to arrange a winding detector 26, 65 close to the magnet pin 38, so that a part of the last winding passes along the winding detector 26, 65 a short time before the weft thread is blocked by the magnet pin 38. According to a variant a winding detector 66 can be applied that can generate a signal that is little influenced by the direction at which the windings 28 are drawn off, in other words a winding detector 66 that is arranged opposite to the magnet pin 38, as shown in Fig. 2 .
  • an individual flowchart for the supply of compressed air to successive relay blowers may be provided for each type of weft thread 4, 5.
  • the latter is particularly applicable if various weft threads are woven at a different weaving speed or transporting speed, more particularly when the speed of the weaving machine is adjusted to the weft thread to be inserted.
  • an individual function may be provided for each type of weft thread 4, 5.
  • a set of relay blowers may consist of at least one single relay blower or a number of relay blowers, for example two relay blowers, which are connected to a compressed-air source via a specific shut-off valve.
  • the supply devices for compressed air to the main blowers, relay blowers and stretching blowers are, of course, not limited to the shut-off valves, throttle valves and compressed-air source shown, but may be replaced by any supply device which can set, control or adjust the supply of compressed air. It is clear that a method for regulating the supply of compressed air to the main blowers may be carried out independently of the method according to the invention and that both methods almost do not affect one another.
  • the method according to the invention offers the advantage that, independently of the type of weft thread and of a variation in the measurements on a plurality of transported weft threads during transport of these weft threads, it is possible to achieve the activation of the supply of compressed air to at least one set of relay blowers in an optimum manner, so that the air consumption is suitably reduced.
  • the relay nozzles may be activated so that the fastest weft thread is supported sufficiently early, and then also the slowest weft thread is supported sufficiently early.
  • the airjet weaving machine is not limited to an airjet weaving machine wherein a weft thread is blown into a guide channel 11 by means of compressed air.
  • the sets of relay blowers of the airjet weaving machine can also blow onto a holder for a weft thread which transports a weft thread through the shed.
  • any fluid such as standard compressed air mixed with a gas, a liquid or a vapor, can be used for inserting a weft thread in a shed of an airjet weaving machine.
  • the method according to the invention claimed in the claims is not limited to the exemplary embodiments which have been shown and described, but may also comprise variants and combinations thereof which fall under the claims.

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  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (12)

  1. Verfahren zum Eintragen eines Schussfadens (4, 5) in eine Luftwebmaschine, welcher Schussfaden (4, 5) in einer Anzahl von Wicklungen auf eine Wickeltrommel (53) eines Vorspulgeräts (7) gewickelt ist, von dem Vorspulgerät (7) abgezogen wird und durch ein Webfach (1) mittels Druckluft transportiert wird, die durch mindestens ein Hauptgebläse (8, 9) und durch aufeinanderfolgende Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20) geblasen wird, das Verfahren umfassend die Schritte des aufeinanderfolgenden Aktivierens der Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20) mit dem Vorschub des Schussfadens (4, 5) durch das Webfach (1), über eine Zeitspanne (40, 41, 42, 43, 44, 45, 46, 47, 48) zum Tragen des Schussfadens (4, 5), des Erfassens eines durchschnittlichen Ankunftszeitpunkts (TA, TA1), zu dem ein vorderes Ende eines durchschnittlichen Schussfadens (4, 5) einen Ankunftsdetektor (25) erreicht, der an einem Ankunftsende des Webfachs (1) angeordnet ist, des Erfassens eines Zeitpunkts (TLW), zu dem die letzte Wicklung von der Wickeltrommel (53) abgewickelt wird, und des Bestimmens als Referenzwert (DT) der Zeitdifferenz zwischen dem durchschnittlichen Ankunftszeitpunkt (TA, TA1) und dem durchschnittlichen Zeitpunkt (TLW), zu dem die letzte Wicklung von der Wickeltrommel (53) abgewickelt wird, dadurch gekennzeichnet, dass mindestens ein Punkt (Pi) einer geschätzten Trajektorie (49, 49A, 49B, 49C) des durch das Webfach (1) transportierten vorderen Endes des durchschnittlichen Schussfadens (4, 5) in Abhängigkeit vom Referenzwert (DT) bestimmt wird, und der Beginn der Zeitspanne (40, 41, 42, 43, 44, 45, 46, 47, 48) für die Zufuhr von Druckluft zu mindestens einem der Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20) an diese geschätzte Trajektorie (49, 49A, 49B, 49C) angepasst ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass aufeinanderfolgende Punkte (P1, P2, P3, P4) der geschätzten Trajektorie (49, 49A, 49B, 49C) des durch das Webfach (1) transportierten vorderen Endes des durchschnittlichen Schussfadens (4, 5) in Abhängigkeit vom Referenzwert (DT) bestimmt werden.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Zeitpunkte (TiW; T1W, T2W, T3W, T4W, TLW), zu denen die Wicklungen von der Wickeltrommel (53) abgewickelt werden, erfasst werden und mindestens ein Punkt (Pi) der geschätzten Trajektorie (49, 49A, 49B, 49C) des durch das Webfach (1) transportierten vorderen Endes des durchschnittlichen Schussfadens (4, 5) in Abhängigkeit vom Referenzwert (DT) und einem erfassten Zeitpunkt (TiW), zu dem eine zugehörige Wicklung von der Wickeltrommel (53) abgewickelt wird, bestimmt wird.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass der mindestens eine Punkt (Pi) bestimmt wird mit der Formel Pi = TiW + ki ∗DT, mit Index i, erfasster Zeitpunkt TiW, zu dem die i-te Wicklung abgewickelt wird, Referenzwert DT, und konstanter Bruchteil ki, wobei 0 < ki ≤ 1..
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der durchschnittliche Ankunftszeitpunkt (TA) und/oder der durchschnittliche Zeitpunkt (TLW), zu dem die letzte Wicklung von der Wickeltrommel (53) abgewickelt wird, basierend auf der letzten Anzahl N von Messungen, insbesondere der letzten zehn bis fünfzig Messungen, insbesondere der letzten zwanzig Messungen, kontinuierlich aktualisiert werden.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass ein Durchmesser der Wickeltrommel (53) des Vorspulgeräts (7) veränderbar ist, wobei nach einer Veränderung des Durchmessers, der durchschnittliche Ankunftszeitpunkt (TA) und/oder der durchschnittliche Zeitpunkt (TLW), zu dem die letzte Wicklung von der Wickeltrommel (53) abgewickelt wird, nochmals bestimmt werden.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Beginn der Zeitspanne (40, 41, 42, 43, 44, 45, 46, 47, 48) für die Zufuhr von Druckluft zu mindestens einem der Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20) an eine geschätzte Trajektorie (49, 49A, 49B, 49C) angepasst ist, so dass genanntes Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20), unmittelbar nachdem das vordere Ende eines durchschnittlichen Schussfadens (4, 5), wie durch die geschätzte Trajektorie (49, 49A, 49B, 49C) bestimmt wurde, genanntes Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20) passiert hat, zumindest nahezu mit vollem Druck bläst.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Ende der Zeitspanne (40, 41, 42, 43, 44, 45, 46, 47, 48) für die Zufuhr von Druckluft zu mindestens einem der Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20) an Messungen an den eingetragenen Schussfäden angepasst ist, wobei die Zeitspanne (40, 41, 42, 43, 44, 45, 46, 47, 48) für die Zufuhr von Druckluft zu mindestens einem der Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20) bei schnellen Schussfäden früher beendet wird als bei langsamen Schussfäden.
  9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die aufeinanderfolgenden Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20) in Sätzen gruppiert werden, wobei die Hilfsgebläse eines Satzes gemeinsam aktiviert und deaktiviert werden.
  10. Eine Luftwebmaschine mit einem Ankunftsdetektor (25) und einem Vorspulgerät (7), mindestens einem Hauptgebläse (8, 9) und aufeinanderfolgenden Hilfsgebläsen (12, 13, 14, 15, 16, 17, 18, 19, 20), wobei ein Schussfaden (4, 5) in einer Anzahl von Wicklungen auf eine Wickeltrommel (53) des Vorspulgeräts (7) gewickelt ist, von dem Vorspulgerät (7) abgezogen wird und durch ein Webfach (1) mittels Druckluft transportiert wird, die durch das mindestens eine Hauptgebläse (8, 9) und durch die aufeinanderfolgenden Hilfsgebläse (12, 13, 14, 15, 16, 17, 18, 19, 20) geblasen wird, dadurch gekennzeichnet, dass eine Steuereinheit (35) zur Anwendung eines Verfahrens nach einem der Ansprüche 1 bis 9 vorgesehen ist.
  11. Die Luftwebmaschine nach Anspruch 10, dadurch gekennzeichnet, dass das Vorspulgerät (7) mit einem Wicklungsdetektor (26, 65, 66) versehen ist, zum Erfassen der Zeitpunkte (TiW; T1W, T2W, T3W, T4W, TLW), zu dem die Wicklungen von der Wickeltrommel (53) abgewickelt werden.
  12. Die Luftwebmaschine nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass das Vorspulgerät (7) es ermöglicht, Schussfäden unterschiedlicher Längen freizugeben, insbesondere das Vorspulgerät (7) mit einer Wickeltrommel (53) versehen ist, deren Umfangslänge mittels eines Motors (52) veränderbar ist.
EP16781131.4A 2015-11-06 2016-10-13 Verfahren zum eintrag eines schussfadens Active EP3371359B1 (de)

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PCT/EP2016/074588 WO2017076600A1 (en) 2015-11-06 2016-10-13 Method for inserting a weft thread

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CN106829626A (zh) * 2017-04-06 2017-06-13 厦门市富众渔具有限公司 一种收线跳位装置及设备
JP7488999B2 (ja) 2020-04-16 2024-05-23 株式会社豊田自動織機 エアジェット織機の異常検知方法及びエアジェット織機

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JPS54106664A (en) * 1978-02-10 1979-08-21 Toyoda Automatic Loom Works Air jetting method of subbnozzle in jet loom
BE899671A (nl) 1984-05-16 1984-11-16 Picanol Nv Regelbare sturing van de inslagdraad van een weefgetouw.
JPH0819604B2 (ja) * 1986-01-13 1996-02-28 津田駒工業株式会社 流体噴射式織機のよこ入れ自己診断装置
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JP5216990B2 (ja) 2005-11-21 2013-06-19 ピカノール エアージェット式織機によこ糸を導入する方法とエアージェット式織機
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JP5958296B2 (ja) * 2012-11-16 2016-07-27 株式会社豊田自動織機 エアジェット織機における圧縮エア流量表示装置

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EP3371359A1 (de) 2018-09-12
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CN108350627A (zh) 2018-07-31
WO2017076600A1 (en) 2017-05-11
CN108350627B (zh) 2020-03-03

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