EP0452667A1 - Procédé pour contrôler l'insertion du fil de trame dans des métiers à tisser à jet d'air - Google Patents

Procédé pour contrôler l'insertion du fil de trame dans des métiers à tisser à jet d'air Download PDF

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Publication number
EP0452667A1
EP0452667A1 EP91103631A EP91103631A EP0452667A1 EP 0452667 A1 EP0452667 A1 EP 0452667A1 EP 91103631 A EP91103631 A EP 91103631A EP 91103631 A EP91103631 A EP 91103631A EP 0452667 A1 EP0452667 A1 EP 0452667A1
Authority
EP
European Patent Office
Prior art keywords
weft
pressure
acceleration
pressure source
time
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Withdrawn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
EP91103631A
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German (de)
English (en)
Inventor
Adnan Dr. Ing. Wahhoud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lindauer Dornier GmbH
Original Assignee
Lindauer Dornier GmbH
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 Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP0452667A1 publication Critical patent/EP0452667A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—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

Definitions

  • the invention relates to a method for controlling the weft insertion on air jet looms, according to which the weft insertion is released into the shed by an electronic control by means of a gaseous medium supplied from a first pressure source after a start signal.
  • a method for transporting a weft thread through the shed of a defenseless weaving machine according to which the speed of the weft threads introduced by means of a weft insertion system with a number of nozzles fed with a fluid is measured in order to produce a signal representative of the measured speed to be produced which is fed to a control system and converted into a control signal which influences the speed-generating components of the weft insertion system in such a way that the speed of each weft thread is measured in the start phase of the weft insertion cycle and the control signal obtained in this way is further processed such that either an auxiliary -Power source is switched on to the weft insertion system at an earlier or later point in time, or the main power source of the weft insertion system is switched off at an earlier or later point in time, that the relevant shot thread flies through the weft insertion path at a predetermined point in time after the thread has been released for insertion.
  • EP 0 105 561 also assumes that if the acceleration values of the weft differ, the entry time also deviates from the target value. This assumption, as is shown in the known patent specification, is incorrect because the weft flight time is not necessarily dependent on the initial acceleration of the weft. Rather, there is a dependency between the weft flight time and the power transmission over the entire length of the weft.
  • a loom with a device for inserting the weft by means of a medium is known, after which the weft is inserted with a main nozzle and a number of auxiliary relay nozzles until its front end has reached the catch nozzle.
  • a signal generator When the weft thread arrives at the catching nozzle, a signal generator generates a signal which is fed to a comparator. Another signal from another signal generator, which monitors the machine speed, is fed to the same comparator.
  • An error signal formed by the comparator from a target / actual value comparison is used as an actuating signal for a pressure regulating valve which controls the pressure of the medium supplied by a pressure source to the main nozzle and the auxiliary nozzles.
  • an excessive pressure profile in the start phase of the weft thread entry has a negative effect on the machine operation and the quality of the goods.
  • Another disadvantage of the proposed solution acc. DE-OS 30 02 862 is that an increase in pressure in the main nozzle results in an increase in the blowing time, which loosens the thread fluttering at the time of closing and ultimately, i.e. leads to insufficiently tightened weft threads on the weft side.
  • the object of the present invention is therefore to provide a method for controlling the weft insertion, which, based on the main nozzle of the weft insertion system, compensates for differences in the weft flight times of successive weft insertion cycles without changing parameters in the main acceleration phase for the weft insertion.
  • the object is achieved in that the weft thread is accelerated in a first acceleration phase at a pressure p 1 of a first pressure source and then the weft thread undergoes further acceleration in a second acceleration phase at a pressure p 2 of a second pressure source.
  • the point in time for initiating the further thread acceleration in the second acceleration phase is controlled as a function of the measured thread flight time over the entire weaving width.
  • the acceleration of the weft in the main or in the first acceleration phase is dependent on the weft material.
  • the weft flight time of the weft to be entered is measured across the width of the fabric web, starting with the time of the weft release t 1 at a pressure p f of a gaseous medium from a first pressure source and ending with the time t 2 of the weft arrival on End of weaving width.
  • the measured weft thread flight time .DELTA.t is now fed to the electronic control and compared in the context of a target / actual value comparison.
  • the electronic control system makes a correction to the connection time t3 of the second pressure source in the sense of moving the connection time to an earlier or later connection of the second pressure source, ie the connection time t3 of the second pressure source is variable.
  • connection time t3 of the second pressure source is that the starting conditions for the respective weft entry are not affected.
  • the time of the weft release t1 and the pressure p f at the time of the weft release is constant for each weft insertion cycle.
  • Figure 1 shows a pressure-time diagram with an underlying speed-time diagram.
  • the release of the weft thread for entry into the shed takes place in the diagram in point 1 at time t 1 at a pressure p f supplied from a first pressure source.
  • a thread release pressure p f acts on the weft thread to be entered. From the time t1 on the weft is accelerated via the main nozzle in such a way that it has an almost constant entry speed over the entire weaving width, or requires a thread flight time which corresponds to the predetermined target thread flight time ⁇ t.
  • the thread flight time ⁇ t itself is measured from the point in time of thread release t 1 to the time of thread arrival t 2 by a thread monitor arranged at the end of the weaving width.
  • the subsequent weft insertion cycle is corrected such that after the first acceleration phase the time t 3 for connecting the second pressure source with a pressure level above the first pressure source lying pressure p2 on the abscissa in the direction t1, for example at the time t3 ,, is shifted.
  • the shifting of the connection time of the second pressure source from t3 to t3 now causes the weft thread at the time t3, that is, at an earlier point in time, to experience a second acceleration via the main nozzle, in order to achieve the target value specified for the thread flight time.
  • connection of the second pressure source is shifted from the connection time t3 to t3, as shown in the dashed curve, ie the connection of the second pressure source takes place at a later time, namely to Time t3.
  • the time t Grenze is determined as the lower limit for the connection of the second pressure source p2. At this point the weft has just reached its flight speed. If the time t4 falls below in relation to the connection of the second pressure source, i.e. the second pressure source p2 is already switched on at a pressure p1 of the first pressure source in the yarn acceleration phase, this regularly leads to damage to the weft thread and to quality-impaired goods.
  • the advantage of the invention is that when processing particularly weak yarns, an overuse in the starting phase of the weft insertion is avoided. On the other hand, if the weft thread is released at reduced pressure in the starting phase, the weft thread is accelerated too little. The consequence of this is that this leads to a wave-shaped weft thread in the weft insertion channel which is difficult to transport across the weaving width. In such a case stretching of the weft thread to achieve a desired fabric quality is almost impossible. With the patented method, however, these disadvantageous consequences are avoided.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP91103631A 1990-04-20 1991-03-09 Procédé pour contrôler l'insertion du fil de trame dans des métiers à tisser à jet d'air Withdrawn EP0452667A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4012616 1990-04-20
DE4012616A DE4012616A1 (de) 1990-04-20 1990-04-20 Verfahren zur steuerung des schussfadeneintrages an luftduesenwebmaschinen

Publications (1)

Publication Number Publication Date
EP0452667A1 true EP0452667A1 (fr) 1991-10-23

Family

ID=6404737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91103631A Withdrawn EP0452667A1 (fr) 1990-04-20 1991-03-09 Procédé pour contrôler l'insertion du fil de trame dans des métiers à tisser à jet d'air

Country Status (4)

Country Link
US (1) US5107902A (fr)
EP (1) EP0452667A1 (fr)
JP (1) JPH05106141A (fr)
DE (1) DE4012616A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10028049B4 (de) * 2000-06-06 2006-06-29 Lindauer Dornier Gmbh Düsenwebmaschine mit einem Schussfadeneintragssystem
DE10224078A1 (de) * 2002-05-31 2003-12-18 Dornier Gmbh Lindauer Verfahren zum Gestreckthalten eines Schussfadens und Webmaschine zur Verfahrensdurchführung
BE1016504A3 (nl) * 2005-04-25 2006-12-05 Picanol Nv Werkwijze voor het inbrengen van een inslagdraad bij een weefmachine.
BE1016900A3 (nl) * 2005-12-20 2007-09-04 Picanol Nv Werkwijze voor het inbrengen van een inslagdraad bij een weefmachine, en weefmachine.
CN101405445B (zh) * 2006-03-21 2010-12-01 泰克斯蒂尔玛股份公司 喷射织机
DE102006025968B3 (de) * 2006-06-02 2007-11-29 Lindauer Dornier Gmbh Verfahren zum Klemmen eines Schussfadens in einer Düsenwebmaschine, insbesondere Luftdüsenwebmaschine, Klemmeinrichtung und Düsenwebmaschine
US20080271807A1 (en) * 2006-09-07 2008-11-06 Sultex Ag Method and a stretching device for the holding of a weft thread
US20100109831A1 (en) * 2008-10-31 2010-05-06 General Electric Company Induction coil without a weld
DE102012208158B3 (de) * 2012-05-15 2013-09-05 Lindauer Dornier Gmbh Luftdüsenwebmaschine mit einer Vorrichtung zur Druckluftversorgung
JP7260387B2 (ja) * 2019-05-06 2023-04-18 津田駒工業株式会社 水噴射式織機における緯入れ方法及び装置
JP2023110373A (ja) * 2022-01-28 2023-08-09 津田駒工業株式会社 空気噴射式織機における緯入れ方法及び緯入れ装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3002862A1 (de) * 1980-01-23 1981-07-30 Gebrüder Sulzer AG, 8401 Winterthur Webmaschine
EP0105561A1 (fr) * 1982-09-30 1984-04-18 Rüti-Te Strake B.V. Procédé pour le transport d'un fil de trame à travers la foule au moyen d'un fluide, ainsi qu'un métier à tisser équipé pour appliquer ce procédé
DE3444161A1 (de) * 1983-12-13 1985-06-20 Saurer Diederichs Sa Druckluftspeisevorrichtung fuer webmaschinen mit pneumatischem eintrag mindestens zweier schussfaeden
EP0186597A2 (fr) * 1984-12-25 1986-07-02 Nissan Motor Co., Ltd. Métier à tisser à jet d'air

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7908357A (nl) * 1979-11-15 1981-06-16 Rueti Te Strake Bv Werkwijze voor het met behulp van een stromend medium transporteren van een inslagdraad door het weefvak bij een weefmachine, alsmede weefmachine, ingericht voor het toepassen van deze werkwijze.
NL8600713A (nl) * 1986-03-20 1987-10-16 Picanol Nv Werkwijze voor de sturing van bijblazers bij het inbrengen van een inslagdraad, bij weefmachines; en inrichting hiertoe aangewend.
DE3843683A1 (de) * 1988-12-23 1990-06-28 Dornier Gmbh Lindauer Schussfadenwaechter fuer luftwebmaschinen
JPH02264033A (ja) * 1989-04-05 1990-10-26 Nissan Motor Co Ltd 空気噴射式織機の緯入れ制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3002862A1 (de) * 1980-01-23 1981-07-30 Gebrüder Sulzer AG, 8401 Winterthur Webmaschine
EP0105561A1 (fr) * 1982-09-30 1984-04-18 Rüti-Te Strake B.V. Procédé pour le transport d'un fil de trame à travers la foule au moyen d'un fluide, ainsi qu'un métier à tisser équipé pour appliquer ce procédé
DE3444161A1 (de) * 1983-12-13 1985-06-20 Saurer Diederichs Sa Druckluftspeisevorrichtung fuer webmaschinen mit pneumatischem eintrag mindestens zweier schussfaeden
EP0186597A2 (fr) * 1984-12-25 1986-07-02 Nissan Motor Co., Ltd. Métier à tisser à jet d'air

Also Published As

Publication number Publication date
DE4012616A1 (de) 1991-10-24
US5107902A (en) 1992-04-28
JPH05106141A (ja) 1993-04-27

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