EP0570701A1 - Méthode d'insertion pneumatique de fil de trame dans un métier à tisser à air - Google Patents

Méthode d'insertion pneumatique de fil de trame dans un métier à tisser à air Download PDF

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Publication number
EP0570701A1
EP0570701A1 EP93106201A EP93106201A EP0570701A1 EP 0570701 A1 EP0570701 A1 EP 0570701A1 EP 93106201 A EP93106201 A EP 93106201A EP 93106201 A EP93106201 A EP 93106201A EP 0570701 A1 EP0570701 A1 EP 0570701A1
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EP
European Patent Office
Prior art keywords
weft
thread
air flow
transport
relay
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Withdrawn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
EP93106201A
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German (de)
English (en)
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 EP0570701A1 publication Critical patent/EP0570701A1/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Withdrawn legal-status Critical Current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
    • D03D47/304—Controlling of the air supply to the auxiliary nozzles

Definitions

  • the invention relates to a method for pneumatic weft insertion on air jet weaving machines, according to which the weft threads of a predetermined length after being released by a thread stopper are inserted from a main nozzle into the weft insertion channel of a reed and by means of relay nozzles arranged over the weaving width, which advance the head region of the respective weft thread by means of a pneumatic transport medium. act in the manner of a flow or transport hiking field and thus transport the weft thread through the weft thread insertion channel at an insertion speed which builds up a thread pulling force.
  • the relay nozzles are pressurized when the weft tip comes into their area, and the relay nozzles are no longer pressurized when the weft tip leaves their area, with the exception of one or more relay nozzles distributed over the width of the weave, which still fly after the weft tip be pressurized until the weft has flown through the weaving width.
  • This process sequence leads to tension peaks in the final phase of the weft insertion Weft and subsequently to the so-called thread break, ie the weft breaks.
  • the weft thread is not inserted at the required speed, ie the velocity (V L ) of the fluid generating the thread pull force and the number of relay nozzles involved in the weft thread insertion are too small, loops and a low thread tension can be expected.
  • first relay nozzles of a relay nozzle row be controlled in such a way that a basic or first air flow for inserting the weft thread into the shed is generated and then second relay nozzles of the relay nozzle row are controlled such that the latter relay nozzles emit an additional or second air flow , which generates the tension force on the weft.
  • the air flow of the first relay nozzles has a speed that almost corresponds to the weft insertion speed specified in the program.
  • the air flow of the second relay nozzles has a significantly higher air speed than the specified entry speed.
  • the object is achieved in that the air flow of the relay nozzles, which transports the weft thread through the weft thread insertion channel of the reed in a manner known per se, acts on the beginning or front region of the weft thread in the manner of a transport migration field.
  • the thread transport hiking field is switched off. This briefly reduces the air flow velocity (V L ) influencing the thread pulling force (F G ) and the weft thread is only transported due to its inherent dynamics. The weft is accordingly in a relatively untensioned condition.
  • FIGS. 1 and 2 denote the groups of relay nozzles arranged over the weaving width of the weaving machine.
  • Groups I to VI form the weft transport hiking field 2 for the tip of the weft thread 1.
  • the individual relay nozzle groups act as traction nozzles. As soon as the thread tip of a relay nozzle group, e.g. I has left, the air supply to the weft is cut off and the transport from the next following relay nozzle group II is taken over.
  • the relay nozzle groups I to VI are thus fed like a relay under a predetermined pressure (p) transport medium, preferably air, via a well-known pneumatic control, the air flowing at a predetermined speed (V L ) out of the individual nozzles of each relay relay group and pulls the weft 1 through the weft insertion channel, not shown here, of the reed of a weaving machine.
  • p predetermined pressure
  • V L predetermined speed
  • FIG. 1 illustrates the known weft transport through the entry channel in the reed.
  • the pneumatic weft thread entry takes place with only a single traveling field, the weft transport path 2.
  • the relay nozzle groups I to VI are switched on and off one after the other.
  • the weft thread 1 which is shown here as a straight line in the diagram in FIG. 1, arrives at the output side of the reed at point 3 with a relatively high entry speed; This is also due to the momentum given to it by the relay-like acceleration across the weaving width. It is therefore not necessary to stretch the weft thread by switching on the relay nozzle groups again.
  • Different thread or yarn qualities and in particular the aforementioned dynamic momentum of the weft threads often lead to so-called weft thread breaks in this process sequence and then to the weaving machine being switched off.
  • Figure 2 shows the pneumatic weft insertion according to the invention.
  • the relay nozzle groups I to VI are plotted over the weave width (x) on the abscissa of FIG. 2 and the blowing duration (t) is plotted on the ordinate.
  • the tip or the front part of the weft thread 1 to be inserted is detected by the first effective relay nozzles of the first relay nozzle group I.
  • the blowing duration is maintained until t 1.
  • the group II is turned on at a time t'1, the blowing duration of which is maintained until the time t2.
  • Group III is turned on at the time t'2.
  • the blowing duration (t) and the rhythm of switching the individual relay nozzle groups on and off remain constant. That remains constant up to this relay nozzle group Air flow velocity (V L ) of the individual relay nozzles of the group in question.
  • the remaining groups V to VI are switched on with a shorter blowing time (t) and a reduced air flow speed (V Lred. ) Compared to the aforementioned groups.
  • the weft thread has such a dynamic that it is possible to easily reach the intended end point 3 in the weft insertion channel of the reed at a reduced air flow speed.
  • the weft thread 1 is thus at least within the end region of the weft insertion channel in an undrawn state (shown in waves in FIG. 2 and labeled 1 ').
  • a weft tension hiking field 4 becomes effective.
  • the weft thread hiking field 4 is built up at a time t5 after all or only at least one group of the relay nozzle groups V to VI were effective or were completely ineffective with reduced air flow velocity. Expediently, however, the tensioning hiking field 4 is set up at the time t'5 after the relay nozzle groups V and VI are partially or completely switched off.
  • the tensioning hiking field 4 is now built up in that, for example, the relay nozzle groups V and VI are either supplied again like a relay or at the same time briefly with compressed air at the time t'5.
  • FIG. 2 also shows that the weft thread tension hiking field 4 consists of sections of tension hiking fields that extend over the weaving width (x) can be distributed, for example by simultaneous relay-like or non-relay-like switching on of relay nozzle groups III and VI.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP93106201A 1992-05-21 1993-04-16 Méthode d'insertion pneumatique de fil de trame dans un métier à tisser à air Withdrawn EP0570701A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4216749 1992-05-21
DE4216749A DE4216749C1 (de) 1992-05-21 1992-05-21 Verfahren zum pneumatischen Schußfadeneintrag auf Luftdüsenwebmaschinen

Publications (1)

Publication Number Publication Date
EP0570701A1 true EP0570701A1 (fr) 1993-11-24

Family

ID=6459369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93106201A Withdrawn EP0570701A1 (fr) 1992-05-21 1993-04-16 Méthode d'insertion pneumatique de fil de trame dans un métier à tisser à air

Country Status (4)

Country Link
US (1) US5345976A (fr)
EP (1) EP0570701A1 (fr)
JP (1) JPH06108345A (fr)
DE (1) DE4216749C1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112431A1 (fr) * 1982-12-24 1984-07-04 GebràœDer Sulzer Aktiengesellschaft Dispositif pour faire fonctionner un métier à jet d'air
EP0134375A1 (fr) * 1983-08-24 1985-03-20 Maschinenfabrik Sulzer-Rüti Ag Dispositif pour faire fonctionner un métier à jet d'air et métier pourvu d'un tel dispositif
EP0238128A2 (fr) * 1986-03-20 1987-09-23 Picanol N.V. Procédé et dispositif pour la commande de tuyères auxiliaires pour l'insertion de la trame
DE4008864A1 (de) * 1990-03-20 1991-09-26 Dornier Gmbh Lindauer Verfahren zur steuerung des schusseintrages in luftwebmaschinen und vorrichtung zur beeinflussung des schussfadens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2328135C3 (de) * 1973-06-02 1980-12-04 Walter 8832 Weissenburg Scheffel Verfahren zum Schußeintrag bei Düsenwebmaschinen
CH648617A5 (de) * 1980-12-17 1985-03-29 Sulzer Ag Verfahren zum betrieb einer webmaschine.
CH671785A5 (de) * 1985-07-05 1989-09-29 Elitex Zavody Textilniho Verfahren zur eintragung von schussgarn auf webmaschinen, sowie vorrichtung zur durchfuehrung dieses verfahrens.
JPH01207440A (ja) * 1988-02-13 1989-08-21 Toyota Autom Loom Works Ltd 無杼織機における緯入れ方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112431A1 (fr) * 1982-12-24 1984-07-04 GebràœDer Sulzer Aktiengesellschaft Dispositif pour faire fonctionner un métier à jet d'air
EP0134375A1 (fr) * 1983-08-24 1985-03-20 Maschinenfabrik Sulzer-Rüti Ag Dispositif pour faire fonctionner un métier à jet d'air et métier pourvu d'un tel dispositif
EP0238128A2 (fr) * 1986-03-20 1987-09-23 Picanol N.V. Procédé et dispositif pour la commande de tuyères auxiliaires pour l'insertion de la trame
DE4008864A1 (de) * 1990-03-20 1991-09-26 Dornier Gmbh Lindauer Verfahren zur steuerung des schusseintrages in luftwebmaschinen und vorrichtung zur beeinflussung des schussfadens

Also Published As

Publication number Publication date
DE4216749C1 (de) 1994-01-05
US5345976A (en) 1994-09-13
JPH06108345A (ja) 1994-04-19

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