EP2319968B1 - Système de contrôle de l'air pour l'insertion de fil de trame dans une machine à tisser pneumatique - Google Patents

Système de contrôle de l'air pour l'insertion de fil de trame dans une machine à tisser pneumatique Download PDF

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Publication number
EP2319968B1
EP2319968B1 EP09425450A EP09425450A EP2319968B1 EP 2319968 B1 EP2319968 B1 EP 2319968B1 EP 09425450 A EP09425450 A EP 09425450A EP 09425450 A EP09425450 A EP 09425450A EP 2319968 B1 EP2319968 B1 EP 2319968B1
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EP
European Patent Office
Prior art keywords
pressure
valve
tank
air supply
supply system
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EP09425450A
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German (de)
English (en)
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EP2319968A1 (fr
Inventor
Dario Pezzoni
Claudio Ranza
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Itema SpA
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Priority to EP09425450A priority Critical patent/EP2319968B1/fr
Priority to CN201010536938.7A priority patent/CN102051754B/zh
Publication of EP2319968A1 publication Critical patent/EP2319968A1/fr
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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
    • D03D47/3053—Arrangements or lay out of air supply systems
    • 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
    • D03D47/306—Construction or details of parts, e.g. valves, ducts

Definitions

  • the present invention concerns an improved air control system for the insertion of weft yarns into a air/pneumatic weaving loom.
  • the pneumatic circuit used for the compressed air coming out of the jet nozzles also serves for the inlet vents of the tuck-in device and for the nozzles arranged along the warp shed and which make up air jet relays to better guide the weft yarn.
  • Each type of weft is launched by a respective, specific nozzle. If a certain fabric provides the insertion of N different weft types, the loom is hence provided with N launch nozzles. Depending on the type of weft to be inserted, it is advantageous for the pressure of the air jet coming out of the respective launch nozzle to be correspondingly adjusted, for achieving an effective, prompt launch which uses as little compressed air as possible.
  • the prior art offers different architectures and operation methods to achieve the adjustment of the nozzle pressure.
  • EP 1260622 discloses a system similar to the one just cited, wherein a pressure adjuster is used to maintain at the desired pressure level a lung or compensation chamber arranged immediately upstream of the valves of the on/off type which control the individual nozzles.
  • EP1731645 discloses a similar arrangement;
  • documents EP189919 and EP 0279222 which represent the closest prior art, disclose similar configurations for air pressure control, wherein a compensation chamber, however, is provided for each nozzle. In these last ones, in particular, it is taught to provide detection sensors of the unwinding speed of the weft off the reel, to be able to provide a self-adjustment parameter for pressure.
  • the supply sequence of yarn A and then of yarn B comprises a sudden pressure change of the compensation chamber of -4 ata which is discharged entirely through the vent valve.
  • the object of the present invention is hence that of prothrough the vent valve.
  • the object of the present invention is hence that of providing a supply system of the launch and relay nozzles which overcomes the drawbacks set forth above, allowing to obtain a control and an improved adjustment of the supply pressure, so as to be able to obtain a more constant launch pressure at a lower cost than the one currently provided.
  • an air supply system to launch or relay nozzle means for a weft yarn in a pneumatic weaving loom comprising at least one outlet on/off valve controlling said nozzle means, further comprising only another inlet on/off valve means on the air supply conduit pertaining to said nozzle means upstream of said outlet on/off valve, and wherein between said outlet valve and inlet valve means there is arranged a storage tank of a volume suited to contain sufficient air for at least one weft yarn launch, and a pressure sensor apt to drive said inlet valve means so as to open when the pressure in the tank drops below a preset minimum threshold and to close when the pressure in the tank rises above a preset maximum threshold, said storage tank (Tk) is cylindrical and elongated, preferably with an aspect ratio greater than 10.
  • said pressure sensor is arranged so as to read the pressure inside said storage tank.
  • said pressure sensor is arranged so as to detect the pressure in a position as far as possible from a air charge port of the tank.
  • An additional aspect of the invention is that between the inlet valve means and the outlet valve, a vent device is further provided.
  • the inlet valve means comprise at least two on/off valve units having respective different preset minimum opening thresholds.
  • Fig. 1 shows diagrammatically a prior-art pneumatic weaving loom.
  • the devices to which compressed air is supplied for driving the launch of weft yarns are essentially the pre-nozzles and the launch nozzles referenced by numerals 10 and 11, respectively, by which the yarn is launched into the warp shed, and the relay nozzles (of which only one is shown, indicated by reference 6), by which the yarn is supported and pushed into the warp shed until it reaches the end opposite to the entry side.
  • the other devices and lines shown in fig. 1 are intended to adjust and distribute the compressed air coming from a source of compressed air of the weaving loom (shown by the arrow connecting to entry 2).
  • each nozzle 11 is connected, in a way known per se, to a supply line of compressed air M - specific for that individual nozzle or group of nozzles - wherefrom it is separated by an on/off outlet valve V 1 , arranged in the proximity of an inlet port of the nozzle device.
  • Line M is in turn connected to the general compressed air distribution conduit of the weaving loom.
  • tank Tk is further arranged, in turn separated from supply M by a second on/off inlet valve means V 2 .
  • tank Tk has a volume suited to contain the amount of air required for at least one launch of one weft yarn from nozzle 11.
  • the tank has a volume of 0.8 - 1.2 It and typically operates at an operation pressure in the order of 2 - 6 bar.
  • tank Tk is cylindrical and elongated, in particular with an aspect ratio above 10.
  • This system is furthermore completed by a pressure sensor P, suited to provide an adjustment signal which controls the second on/off inlet valve means V 2 .
  • Pressure sensor P is arranged in any one position between the two on/off valves V 1 and V 2 , between which the circuit theoretically has the same pressure in static conditions. Sensor P can hence be, for example, also just upstream of the first on/off outlet valve V 1 ( fig. 4 ).
  • sensor P is arranged at the bottom end of tank Tk, i.e. at the opposite end to the end wherein the inlet and charge port for the compressed air is provided.
  • tank Tk preferably has a single load/unload charge/discharge port, whereon a T-junction connection is installed which connects the circuit both to inlet valve means V 2 and to outlet valve V 1 to nozzle 11.
  • a T-junction connection is installed which connects the circuit both to inlet valve means V 2 and to outlet valve V 1 to nozzle 11.
  • the two charge and discharge ports of the tank are distinct but nevertheless arranged on the same bottom end of the tank.
  • Fig. 3 shows instead an embodiment wherein charge and discharge ports are located at the two opposite ends of the tank Tk: in such case, for adjustment regularity, it is preferable for pressure sensor P to be arranged so as to read the pressure inside tank Tk about halfway through its extension.
  • the system is configured so as to work as follows.
  • On/off inlet valve V 2 is open and tank Tk is charged with compressed air until it reaches an upper pressure threshold Psu detected by sensor P.
  • valve V 2 is closed and the system is ready for weft launch.
  • outlet valve V 1 is opened and the compressed air available in tank Tk is used for performing the weft launch through nozzle 11.
  • inlet valve V 2 is re-opened, which enables the re-charging of tank Tk.
  • tank Tk is sized so as to have a volume sufficient for at least one launch, the charging of tank Tk and the relative pressure fluctuations occur in a transient phase between one launch and the next one.
  • the two threshold pressures are defined by the control logic of the weaving loom, based on the specific yarn which must be launched from the nozzle; these thresholds can also be changed during operation upon varying the contour conditions, for example based on the weaving conditions of temperature and humidity.
  • vent valve V 3 can be provided on different embodiments, as shown in figs. 5-7 .
  • vent valve V 3 is arranged upstream of the charge port to tank Tk.
  • Figs. 8-9 show an embodiment of the system applied to the relay nozzles.
  • fig. 8 there is a vent valve V 3 also provided.
  • tank Tk is sized to be able to supply air to all the relays for an entire weft launch. Since the pressure required by the relays is substantially the same, a single tank Tk can supply simultaneously all the relays. In special conditions, it could be an advantage to provide two (or more) relay nozzle tanks in sequence (one for relay nozzle groups 1..n and one for relay nozzle groups n+l..m) which, from the point of view of operation and pressure charging, are equal.
  • said inlet valve means V 2 comprise more than one inlet valve units, due to the need to have more airflow, or a fastest pressure decreasing.
  • said inlet valve means V 2 comprise more than one inlet valve units, due to the need to have more airflow, or a fastest pressure decreasing.
  • a first valve unit is opened: in low air consumption condition, this is enough and, in steady conditions, only the first valve unit is opened and closed; if the air consumption is greater, the pressure decrease gradient is much more high and also the second valve unit will be activated: in such a condition, it can result that the first valve unit is kept continuously open and the second is commutating, depending on the pressure.
  • sensor P can operate with low precision and resolution, for example between two threshold values Psu and Psl mutually separated by 0.1 bar: this positively affects the economy of the sensor.

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

Claims (7)

  1. Système d'alimentation en air de moyens de buse de lancement (10, 11) ou de buse-relais (6) pour un fil de trame dans un métier à tisser pneumatique, comprenant au moins une soupape de marche/arrêt de sortie (V1) contrôlant lesdits moyens de buse, un réservoir de stockage (Tk) et un capteur de pression (P), caractérisé en ce que :
    il comprend en outre uniquement un autre moyen de soupape de marche/arrêt d'entrée (V2) sur le conduit d'alimentation en air appartenant auxdits moyens de buse en amont de ladite soupape de marche/arrêt de sortie (V1), et en ce que :
    entre lesdits moyens de soupape de sortie (V1) et de soupape d'entrée (V2), on agence ledit réservoir de stockage (Tk) d'un volume approprié pour contenir l'air suffisant pour au moins un lancement de fil de trame, et ledit capteur de pression (P) qui est apte à entraîner lesdits moyens de soupape d'entrée (V2) pour qu'ils s'ouvrent, lorsque la pression dans le réservoir (Tk) chute au-dessous d'un seuil minimum préréglé (Ps1), et pour qu'ils se ferment lorsque la pression dans le réservoir (Tk) monte au-dessus d'un seuil maximum préréglé (Psu) et en ce que ledit réservoir de stockage (Tk) est cylindrique et allongé, de préférence avec un rapport d'aspect supérieur à 10.
  2. Système d'alimentation en air selon la revendication 1, dans lequel ledit capteur de pression (P) est agencé afin de lire la pression à l'intérieur dudit réservoir de stockage (Tk).
  3. Système d'alimentation en air selon la revendication 2, dans lequel ledit capteur de pression (P) est agencé afin de détecter la pression dans une position située aussi loin que possible d'un orifice de chargement d'air du réservoir (Tk).
  4. Système d'alimentation en air selon l'une quelconque des revendications précédentes, dans lequel ledit réservoir de stockage (Tk) a un orifice de chargement et un orifice de déchargement à la même extrémité.
  5. Système d'alimentation en air selon l'une quelconque des revendications précédentes, dans lequel, entre lesdits moyens de soupape d'entrée (V2) et ladite soupape de sortie (V1), on prévoit en outre un dispositif d'évent (V3).
  6. Système d'alimentation en air selon la revendication 6, dans lequel ledit dispositif d'évent (V3) est agencé en amont dudit réservoir de stockage (Tk).
  7. Système d'alimentation en air selon l'une quelconque des revendications précédentes, dans lequel lesdits moyens de soupape d'entrée (V2) comprennent au moins deux unités de soupape de marche/arrêt ayant des seuils minimums préréglés (Ps1) différents respectifs.
EP09425450A 2009-11-09 2009-11-09 Système de contrôle de l'air pour l'insertion de fil de trame dans une machine à tisser pneumatique Active EP2319968B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09425450A EP2319968B1 (fr) 2009-11-09 2009-11-09 Système de contrôle de l'air pour l'insertion de fil de trame dans une machine à tisser pneumatique
CN201010536938.7A CN102051754B (zh) 2009-11-09 2010-11-09 用于将纬纱插在气动织机中的空气控制系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09425450A EP2319968B1 (fr) 2009-11-09 2009-11-09 Système de contrôle de l'air pour l'insertion de fil de trame dans une machine à tisser pneumatique

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EP2319968A1 EP2319968A1 (fr) 2011-05-11
EP2319968B1 true EP2319968B1 (fr) 2013-01-02

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CN (1) CN102051754B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104562392A (zh) * 2013-10-29 2015-04-29 株式会社丰田自动织机 用于控制喷气织机内的压缩空气压力的设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5866804B2 (ja) * 2011-05-31 2016-02-24 株式会社豊田自動織機 エアジェット織機におけるエア供給システム
EP2721207B1 (fr) * 2011-06-15 2019-01-02 Picanol Dispositif de régulation de pression

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
NL8200169A (nl) * 1982-01-18 1983-08-16 Rueti Te Strake Bv Werkwijze voor het weven op een spoelloze weefmachine.
IT1215235B (it) 1985-01-30 1990-01-31 Omv Off Mecc Vilminore Dell'alimentazione di filati di dispositivo di autoregolazione trama in telai di tessitura ad aria.
IT1201202B (it) 1987-01-26 1989-01-27 Omv Off Mecc Vilminore Dispositivo di autoregolazione di alimentazione di filati di trama in telai di tessitura ad aria
BE1010015A3 (nl) 1996-02-09 1997-11-04 Picanol Nv Inrichting voor het toevoeren van perslucht aan een hoofdblazer van een weefmachine.
DE10124290C1 (de) 2001-05-17 2003-01-23 Dornier Gmbh Lindauer Düsenwebmaschine, insbesondere Lüftdüsenwebmaschnine mit einem Schussfadeneintragsystem
JP4399228B2 (ja) * 2003-10-08 2010-01-13 株式会社豊田自動織機 ジェットルームにおける緯入れ制御装置
ITVI20050169A1 (it) * 2005-06-09 2006-12-10 Smit Spa Dispositivo di alimentazione e controllo dell'aria per il trasporto pneumatico della trama in macchine per tessere a getto d'aria
CN2869054Y (zh) * 2005-12-31 2007-02-14 江苏万工科技集团有限公司 喷气织机的高压气流输送装置
CN1932106B (zh) * 2006-06-15 2011-03-30 江苏万工科技集团有限公司 引纬槽气流探测器的气电控制装置
DE502008001187D1 (de) * 2007-09-12 2010-10-07 Itema Switzerland Ltd Verfahren zur Druckregelung in einer Webmaschine und Webmaschine mit Druckregelsystem

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104562392A (zh) * 2013-10-29 2015-04-29 株式会社丰田自动织机 用于控制喷气织机内的压缩空气压力的设备
CN104562392B (zh) * 2013-10-29 2016-08-24 株式会社丰田自动织机 用于控制喷气织机内的压缩空气压力的设备

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Publication number Publication date
CN102051754B (zh) 2014-07-23
CN102051754A (zh) 2011-05-11
EP2319968A1 (fr) 2011-05-11

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