EP1731645A2 - Luftzufuhr- und Luftregelungsvorrichtung zum pneumatischen Fördern des Schussfadens in einer Luftdüsenwebmaschine - Google Patents

Luftzufuhr- und Luftregelungsvorrichtung zum pneumatischen Fördern des Schussfadens in einer Luftdüsenwebmaschine Download PDF

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Publication number
EP1731645A2
EP1731645A2 EP06114613A EP06114613A EP1731645A2 EP 1731645 A2 EP1731645 A2 EP 1731645A2 EP 06114613 A EP06114613 A EP 06114613A EP 06114613 A EP06114613 A EP 06114613A EP 1731645 A2 EP1731645 A2 EP 1731645A2
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EP
European Patent Office
Prior art keywords
air
weft
feeding
tank
phase
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Withdrawn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
EP06114613A
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English (en)
French (fr)
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EP1731645A3 (de
Inventor
Roberto Capitanio
Marco Novella
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Smit SpA
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Smit SpA
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Publication date
Application filed by Smit SpA filed Critical Smit SpA
Publication of EP1731645A2 publication Critical patent/EP1731645A2/de
Publication of EP1731645A3 publication Critical patent/EP1731645A3/de
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to an air feeding and control device for the pneumatic transporting of the weft in air-jet weaving machines, such as looms, and, more specifically, it relates to a device suitable for regulating the air flow-rate to the nozzles during the insertion of the weft yarns.
  • Methods are known for feeding a series of nozzles in air-jet looms, in which the above nozzles transmit the compressed air energy to the weft yarns, as are also methods for controlling the insertion of the weft in the warp mouth, retroactively acting on the parameters that influence it, such as pressures, timing, etc., in order to make it stable with time.
  • the known methods make use of pressure control systems which feed a series of electrovalves of the ON/OFF type connected, by means of ducts, to the weft insertion nozzles.
  • An objective of the present invention is therefore to overcome the above drawbacks and, in particular, to provide an air feeding and control device for the pneumatic transporting of the weft in air-jet weaving machines or looms, which allows an effective control of the air flow-rate for the insertion of the weft yarns.
  • a further objective of the invention is to provide an air feeding and control device for the pneumatic transporting of the weft in air-jet looms, which minimizes the waste of air in the environment during the insertion phases of the weft yarns.
  • Another objective of the present invention is to provide a reliable and effective air feeding and control device for the pneumatic transporting of the weft in air-jet looms and which at the same time is easy and economical with respect to the traditional systems.
  • an air feeding system for the pneumatic transporting of the weft is generically indicated with 1 and mainly consists of a control system 24, an air accumulation and feeding system 31, which requires a compressed air source 2 at a pressure stabilized by the pressure regulator 8, and a series of electrovalves 10, 11, 12, 13, which are present in a number equal to the number of wefts 18, 19, 20, 21 which can be inserted (in the pneumatic transporting device illustrated in figure 1 there are four electrovalves, as the system, described as an example, is capable of effecting the insertion of four wefts).
  • the air accumulation and feeding system 31 in turn consists of a flow regulator 3, a tank 4, an electrovalve 5 and a pressure sensor 6.
  • the operating cycle of the system can be divided into two fundamental phases: a first phase, during which the electrovalves 10, 11, 12, 13 are closed and consequently air does not flow to the nozzles 14, 15, 16, 17, and a second phase, during which at least one of these electrovalves 10, 11, 12, 13 feeds the corresponding nozzle 14, 15, 16, 17.
  • control system 24 regulates the quantity of air present in the tank 4 at a first pre-established reference value and calculated on the basis of data inserted by the operator and at weft insertion times 18-21 inside the channel 22, which are measured by means of the sensor device 23.
  • control system 24 can introduce air into the tank 4 or discharge air from the tank 4, by means of the flow regulator 3 and electrovalve 5, respectively, on the basis of the signal coming from the pressure sensor 6, caused by the mass of air contained in the tank 4.
  • the pre-established reference value of the quantity of air present in the tank 4 and the signal coming from the pressure sensor 6, are ignored and, with a pre-established phasing, one of the electrovalves 10-13 is opened and, in succession, the flow regulator 3 regulates the air flow-rate with which the tank 4 is fed and consequently the flow at the outlet of the nozzle fed, at a pre-established reference value on the basis of the data inserted by the operator and at the weft insertion times 18-21 in the channel 22, parameters revealed by means of the sensor device 23.
  • the flow regulator 3 is closed and, in succession, the electrovalve 10-13 which was open is closed, thus obtaining a fall in the air mass contained in the tank 4 and therefore preventing said air mass from being discharged, if necessary, by means of the electrovalve 5, during the subsequent first phase of the operating cycle.
  • the air energy for inserting the weft yarns 18-21 it is possible to optimally use the air energy for inserting the weft yarns 18-21.
  • the diagram of figure 3 represents a possible functioning procedure of the air feeding system object of the invention, in which the traces D symbolically represent the open/close movement of the warp yarns forming the so-called warp mouths, through which the weft yarns 18-21 are inserted.
  • the areas indicated with Q in the graph CH0 of figure 3 represent the first phases of the operating cycle, during which a pre-established quantity of air is accumulated inside the tank 4; the areas indicated with R and P in the graph CH0 of figure 3 represent the second phases of the operating cycle, during which one of the electrovalves 10-13 is opened.
  • Said flow-rate can be maintained or varied by means of the flow regulator 3, in relation to the requirements of the yarn to be inserted and the weft insertion times requested.
  • the graph of figure 2 clearly illustrates the advantage of being able to obtain a rapid increase in the air flow-rate, which allows a considerable saving.
  • the ordinate corresponding to 90% of the maximum flow is, for example, the air flow necessary for initiating the transporting of the weft
  • the time t2 is the time required by a feeding device of the traditional type for reaching the air flow-rate required
  • the time t1 is the time required by the feeding device object of the present invention.
  • the flow regulator 3 used is extremely reactive and does not suffer from the typical delays of a pneumatic circuit, since the geometry of a passage section of the air flow is regulated, it is possible to effectively manage the value and trend of the air flow-rate during the second phase of the operating cycle, in relation to the parameters for the weft insertion (overall timing, arrival times, coil unwinding times, characteristics of the weft, etc.) and the phase of the weaving machine cycle.
  • Figure 4 refers to a particular alternative embodiment, illustrative but non-limiting, of the feeding device according to the invention, wherein in the air accumulation and feeding system 31, the function of the pressure sensor 6 of figure 1 is substituted by two flow sensors 7 and 9, situated at the inlet and outlet respectively of the tank 4.
  • the function of these sensors is to allow the control 24 to determine the quantity of air to be accumulated in the tank 4 during the first phase described above.
  • Figure 5 relates to a further alternative embodiment, illustrative but non-limiting, of the feeding device according to the invention, wherein in the air accumulation and feeding system 31, the function of the pressure sensor 6 of figure 1 is substituted by a flow sensor 29, situated on the line of a discharge electrovalve 30.
  • An opening of said electrovalve 30 during the first phase creates a signal of the flow-rate sensor proportional to the quantity of air present in the tank 4; the opening of the electrovalve 30 must have a minimum duration and flow-rate, so that the quantity of air dispersed in the environment is insignificant.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP06114613A 2005-06-09 2006-05-29 Luftzufuhr- und Luftregelungsvorrichtung zum pneumatischen Fördern des Schussfadens in einer Luftdüsenwebmaschine Withdrawn EP1731645A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVI20050169 ITVI20050169A1 (it) 2005-06-09 2005-06-09 Dispositivo di alimentazione e controllo dell'aria per il trasporto pneumatico della trama in macchine per tessere a getto d'aria

Publications (2)

Publication Number Publication Date
EP1731645A2 true EP1731645A2 (de) 2006-12-13
EP1731645A3 EP1731645A3 (de) 2009-01-07

Family

ID=36968583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06114613A Withdrawn EP1731645A3 (de) 2005-06-09 2006-05-29 Luftzufuhr- und Luftregelungsvorrichtung zum pneumatischen Fördern des Schussfadens in einer Luftdüsenwebmaschine

Country Status (4)

Country Link
EP (1) EP1731645A3 (de)
JP (1) JP2006342484A (de)
CN (1) CN1876920A (de)
IT (1) ITVI20050169A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2037024A1 (de) * 2007-09-12 2009-03-18 Sultex AG Verfahren zur Druckregelung in einer Webmaschine und Webmaschine mit Druckgegelsystem
WO2010046092A1 (en) * 2008-10-22 2010-04-29 Picanol N.V. Method and device for monitoring an insertion system for a weaving machine
EP2319968A1 (de) * 2009-11-09 2011-05-11 Promatech S.p.A. Luftsteuerungssystem zum Eintragen einer Schussfaden in einen pneumatischen Webstuhl
EP2733243A1 (de) * 2012-11-16 2014-05-21 Kabushiki Kaisha Toyota Jidoshokki Vorrichtung zur Anzeige der Druckluftdurchflussmenge in einer Luftdüsenwebmaschine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2721206B1 (de) * 2011-06-15 2016-08-03 Picanol Luftzufuhrsystem für eine luftdüsenwebmaschine
CN102286832B (zh) * 2011-07-21 2013-11-20 北京经纬纺机新技术有限公司 喷气织机气压调控系统及其方法
CN103160999A (zh) * 2013-03-14 2013-06-19 山东日发纺织机械有限公司 一种喷气织机专用流量计装置
CN107503028B (zh) * 2017-08-09 2020-01-24 江苏大学 一种球网机中送纬自动调节装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4651785A (en) * 1983-12-13 1987-03-24 Saurer-Diederichs S.A. Compressed air supply device for a weaving machine with pneumatic picking of at least two weft threads
EP0234064A2 (de) * 1986-02-24 1987-09-02 Tsudakoma Corporation Verfahren und Vorrichtung zum automatischen Überwachen des Schussfadeneintrags
EP0442546A1 (de) * 1990-02-15 1991-08-21 Picanol N.V. Vorrichtung zur Schussfadenzufuhr an Luftwebmaschinen
DE4226693A1 (de) * 1991-08-12 1993-02-18 Nissan Motor Stroemungsduesen-webautomat und verfahren zu dessen steuerung
EP1260622A1 (de) * 2001-05-17 2002-11-27 Lindauer Dornier Gesellschaft M.B.H Düsenwebmaschine, insbesondere Luftdüsenwebmaschine mit einem Schussfadeneintragsystem
EP1420095A2 (de) * 2002-11-14 2004-05-19 Tsudakoma Kogyo Kabushiki Kaisha Lüftversorgungssvorrichtung für Düsenwebmaschine
WO2006114187A1 (en) * 2005-04-25 2006-11-02 Picanol N.V. Method for introducing a weft thread in a weaving machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4651785A (en) * 1983-12-13 1987-03-24 Saurer-Diederichs S.A. Compressed air supply device for a weaving machine with pneumatic picking of at least two weft threads
EP0234064A2 (de) * 1986-02-24 1987-09-02 Tsudakoma Corporation Verfahren und Vorrichtung zum automatischen Überwachen des Schussfadeneintrags
EP0442546A1 (de) * 1990-02-15 1991-08-21 Picanol N.V. Vorrichtung zur Schussfadenzufuhr an Luftwebmaschinen
DE4226693A1 (de) * 1991-08-12 1993-02-18 Nissan Motor Stroemungsduesen-webautomat und verfahren zu dessen steuerung
EP1260622A1 (de) * 2001-05-17 2002-11-27 Lindauer Dornier Gesellschaft M.B.H Düsenwebmaschine, insbesondere Luftdüsenwebmaschine mit einem Schussfadeneintragsystem
EP1420095A2 (de) * 2002-11-14 2004-05-19 Tsudakoma Kogyo Kabushiki Kaisha Lüftversorgungssvorrichtung für Düsenwebmaschine
WO2006114187A1 (en) * 2005-04-25 2006-11-02 Picanol N.V. Method for introducing a weft thread in a weaving machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2037024A1 (de) * 2007-09-12 2009-03-18 Sultex AG Verfahren zur Druckregelung in einer Webmaschine und Webmaschine mit Druckgegelsystem
WO2010046092A1 (en) * 2008-10-22 2010-04-29 Picanol N.V. Method and device for monitoring an insertion system for a weaving machine
BE1018324A3 (nl) * 2008-10-22 2010-09-07 Picanol Nv Werkwijze en inrichting voor het controleren van een insertiesysteem voor een weefmachine.
EP2319968A1 (de) * 2009-11-09 2011-05-11 Promatech S.p.A. Luftsteuerungssystem zum Eintragen einer Schussfaden in einen pneumatischen Webstuhl
EP2733243A1 (de) * 2012-11-16 2014-05-21 Kabushiki Kaisha Toyota Jidoshokki Vorrichtung zur Anzeige der Druckluftdurchflussmenge in einer Luftdüsenwebmaschine

Also Published As

Publication number Publication date
ITVI20050169A1 (it) 2006-12-10
CN1876920A (zh) 2006-12-13
JP2006342484A (ja) 2006-12-21
EP1731645A3 (de) 2009-01-07

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