EP0453032A1 - Méthode et dispositif pour établir ou réétablir la course d'un fil entre une réserve de fil et un dispositif de consommation de fil - Google Patents

Méthode et dispositif pour établir ou réétablir la course d'un fil entre une réserve de fil et un dispositif de consommation de fil Download PDF

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Publication number
EP0453032A1
EP0453032A1 EP91200870A EP91200870A EP0453032A1 EP 0453032 A1 EP0453032 A1 EP 0453032A1 EP 91200870 A EP91200870 A EP 91200870A EP 91200870 A EP91200870 A EP 91200870A EP 0453032 A1 EP0453032 A1 EP 0453032A1
Authority
EP
European Patent Office
Prior art keywords
yarn
weft
guiding passage
source
brake
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Withdrawn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
EP91200870A
Other languages
German (de)
English (en)
Inventor
Paul Gunneman
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.)
Rueti Te Strake BV
Original Assignee
Rueti Te Strake BV
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 Rueti Te Strake BV filed Critical Rueti Te Strake BV
Publication of EP0453032A1 publication Critical patent/EP0453032A1/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Withdrawn legal-status Critical Current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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means

Definitions

  • the invention relates to a method for (re)establishing the yarn course between a yarn source and a yarn consuming device, by presenting the leading end of the yarn at the inlet of a guiding passage leading towards the yarn consuming device and transporting said yarn through said guiding passage by means of a pressurized air jet.
  • the weft yarn usually has to follow a rather tortuous path which makes it very difficult or even almost impossible to thread the yarn in by hand. For that reason the threading-in of the weft yarn in modern weaving machines is sought to be effected, for the greater part, in an automatic manner.
  • the air-transporting passage used therewith and the connected section of the yarn consuming device usually also show a rather tortuous course. As a result of this the head of the yarn taken along by the air jet may easily get arrested against portions of the guiding passage wall so that the yarn length following the leading end will get “dammed up". This may lead to clotting and hence to a considerable yarn waste.
  • the present invention aims at overcoming or at least reducing the above drawbacks. According to the invention this aim is achieved by transporting the yarn through the guiding passage in a pulsating manner.
  • the pulse frequency may be selected depending on the type of yarn to be transported and that the control of the yarn may be influenced by varying the pulse frequency.
  • the pulsating transport of the yarn through the guiding passage may be effected in a practical way by pulsatingly braking the yarn at an upstream location while using a substantially constant pressurized-air jet.
  • a device of this type well-known per se is characterized in that at a location upstream of said guiding passage a yarn brake is provided which is adapted to be powered in a pulsating manner.
  • a yarn brake is often provided upstream of the weft yarn threading passage. Under normal (weaving) conditions such a yarn brake is adjusted so as to apply a predetermined constant braking force onto the continuously moving weft yarn which keeps the yarn under a certain tension and will allow to control the yarn course through the machine. During such normal use the supply of pressurized air to the yarn threading passage will be turned off. It will be appreciated that such a brake may be utilized to fulfil the pulsating braking function according to this invention by pulsatingly interrupting the braking action or interruptingly lowering the braking level.
  • Fig. 1 shows the following parts and devices:
  • this diagram corresponds to that of a well-known pneumatic weaving machine.
  • a weft-preparing device of the "drum”-type consisting of a winding arm 5a (the so-called “flyer") having a guiding passage for the weft yarn, and a stationary drum 5b adapted to collect the weft yarn in the form of a number of windings, as well as a blocking pin 5c extending from the winding surface of the drum.
  • weft yarn 12 is continuously drawn from the yarn package 1 and guided, via the guiding eyelet 2 and the threading injector 4, towards and through the guiding passage in the winding arm 5a, which coils the yarn onto the drum 5b.
  • the locking pin 5c is retracted from the winding surface of the drum 5b which releases the collected weft length and permits this weft length to be delivered to the main injector 6 which is supplied by pressurized air and is adapted to transport said weft length through the weaving shed 8.
  • the completion of the weft insertion is detected by the detecting device 11, while the inserted weft length is severed by the cutting member 7 at a location between the main injector 6 and the entrance of the weaving shed 8.
  • the threading injector 5 is functioning merely as a yarn guiding member, which guides the weft drawn from the package 1 along a certain path between surrounding constructive parts towards the entrance of the weft-preparing device 5. No pressurized air is supplied to the threading injector 4 under these conditions.
  • the threading injector 4 has to fulfil its threading function whenever the yarn course between the yarn package 1 and e.g. the location (marked by "x") of the weft-preparing device 5 at the start of a (new) operational period has to established.
  • This so-called “thread procedure” is effected by presenting the leading end of the yarn 12 at the entrance of the threading injector 4, which is to be supplied by pressurized air during the threading procedure.
  • the air flow generated by the pressurized air within the guiding passage through the injector takes the yarn along into the direction of the entrance of the winding arm 5a and causes the yarn to be transported through the passage within said winding arm 5a.
  • the yarn leaving the winding arm 5a at the location x may thereafter be wound, in the desired number of windings, around the drum 5b, after which the leading end of the yarn is presented at the entrance of the main injector 6, which will subsequently take care for the first weft insertion through the weaving shed 8.
  • the arrival of the leading end of the yarn at the location x may e.g. be detected by a suitable detecting device and the detection signal may be used to cut-off the pressurized air supply to the threading injector 4. This completes the automatic (part) of the (threading) procedure.
  • the electro-magnetic yarn brake 3 comprises a coil 13 to be energized by a pulsating voltage source indicated at 19.
  • a core and a pole shoe are indicated at 14 and 15 respectively.
  • a spring strip 17 has a longitudinal slot 18 and is connected, at its slotted end, to the pole shoe 15.
  • the yarn 12 is moving on a supporting surface 16 in the direction indicated by the arrow.
  • the yarn 12 In the condition of the spring strip 17 shown by full lines, the yarn 12 is moving losely (i.e. without a braking force acting on it) across the supporting surface 16, thereby passing through the space left by the slot 18.
  • the spring strip 17 is retracted by the pole shoe 15 under the influence of the attracting force generated by the momentaneous energization of the coil 13.
  • the spring strip 17 will return to its untensioned position shown by dash-dotted lines, in which position the yarn 12 is clamped between the supporting surface 16 and the overlying spring strip 17 with a certain braking force.
  • This braking force may be adjusted (by well-known means not shown) to the desired level.
  • the yarn might also be guided between the spring strip 17 and the pole shoe 15, in which case no braking force is applied to the yarn in the de ⁇ nergized state. In this case one could speak of a pulsatingly closing yarn brake.
  • yarn brakes e.g. with a mechanically adjustable braking level
  • yarn brakes of the double spring leaf type yarn brakes of the poppet type and yarn brakes of the multiple deviation type would be suitable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP91200870A 1990-04-17 1991-04-12 Méthode et dispositif pour établir ou réétablir la course d'un fil entre une réserve de fil et un dispositif de consommation de fil Withdrawn EP0453032A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9000905A NL9000905A (nl) 1990-04-17 1990-04-17 Werkwijze en inrichting voor het tot stand brengen respectievelijk herstellen van de garenloop tussen een garenvoorraad en een garen-verwerkende inrichting.
NL9000905 1990-04-17

Publications (1)

Publication Number Publication Date
EP0453032A1 true EP0453032A1 (fr) 1991-10-23

Family

ID=19856948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91200870A Withdrawn EP0453032A1 (fr) 1990-04-17 1991-04-12 Méthode et dispositif pour établir ou réétablir la course d'un fil entre une réserve de fil et un dispositif de consommation de fil

Country Status (3)

Country Link
EP (1) EP0453032A1 (fr)
JP (1) JPH06280133A (fr)
NL (1) NL9000905A (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE903172A (nl) * 1985-09-04 1986-03-04 Picanol Nv Voorafwikkelaar met ontstoffing voor de draadvoorbereiding bij weefmachines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE903172A (nl) * 1985-09-04 1986-03-04 Picanol Nv Voorafwikkelaar met ontstoffing voor de draadvoorbereiding bij weefmachines

Also Published As

Publication number Publication date
NL9000905A (nl) 1991-11-18
JPH06280133A (ja) 1994-10-04

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