EP0368108A1 - Falschdralleinheit für eine Düsenspinnvorrichtung - Google Patents

Falschdralleinheit für eine Düsenspinnvorrichtung Download PDF

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Publication number
EP0368108A1
EP0368108A1 EP89120069A EP89120069A EP0368108A1 EP 0368108 A1 EP0368108 A1 EP 0368108A1 EP 89120069 A EP89120069 A EP 89120069A EP 89120069 A EP89120069 A EP 89120069A EP 0368108 A1 EP0368108 A1 EP 0368108A1
Authority
EP
European Patent Office
Prior art keywords
air
yarn
false twist
channel
expansion chamber
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Withdrawn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
EP89120069A
Other languages
German (de)
English (en)
French (fr)
Inventor
Herbert Dr. Stalder
Emil Briner
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.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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 Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP0368108A1 publication Critical patent/EP0368108A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/11—Spinning by false-twisting
    • D01H1/115—Spinning by false-twisting using pneumatic means

Definitions

  • the invention relates to a false twist unit according to the preamble of patent claim 1.
  • a false twist unit which has a tapered intake duct in the thread running direction, an expansion chamber which connects to the narrowest point of the intake duct and can be connected to a vacuum source, a throttle point and a swirl duct is known from EP-A-0 121 602.
  • EP-A-0 121 602 refers to DE-A-27 22 319, according to which an air supply hole opens into the swirl duct, the axis of which is spaced from the axis of the swirl duct and an acute angle with a plane perpendicular to the latter axis from 45 to 60 o forms.
  • the expansion chamber which can be connected to a vacuum source, serves to maintain an optimal air velocity in the intake duct.
  • the object of the present invention is to design the false twist unit according to the preamble of patent claim 1 in such a way that a higher quality (in particular strength) of the yarn produced and / or a higher production speed can be achieved than with known false twist units.
  • the object is achieved in the false twist unit according to the invention in that the acute angle which the axis of the air supply bore forms with a plane perpendicular to the axis of the swirl channel has a size between 30 o and 40 o .
  • This angle which is considerably smaller than that of known false twist units, means that the speed of the air supply bore in the Swirl duct blown airflow has a smaller component in the axial direction of the swirl duct.
  • the angle of 30 ° to 40 ° preferably approximately 35 °
  • the reduced angle means that the speed of the air flow blown in has a larger component in the circumferential direction of the swirl duct.
  • the air flow can therefore rotate the yarn running through the swirl channel more quickly without increasing the air consumption, so that a higher axial speed of the yarn in the swirl channel is possible for an equal twist of the yarn.
  • This higher speed leads not only to a higher production, but also to a higher quality, in particular strength, of the yarn produced, because the faster running delivery rollers, which deliver a sliver into the intake duct, generate stronger air currents by improving the accumulation of more edge fibers can be obtained on the yarn.
  • the false twist unit shown contains, in succession, a tapered intake duct 1, an annular expansion chamber 2, which adjoins the narrowest point 1a of the intake duct 1, a throttle point 3 and a swirl duct 4.
  • the expansion chamber 2 has an air outlet 5, which is connected to a vacuum source 6 and a purge air inlet 7, which is connected to an adjustable throttle valve 8.
  • At least one air supply bore 9 opens into the swirl duct 4, the axis A of which is at a distance from the axis B of the swirl duct 4 (perpendicular to the plane of the drawing) Has.
  • the air supply bore 9 can usefully open approximately tangentially to the wall of the swirl channel 4 in this.
  • the axis A of the air supply bore 9 forms with a perpendicular to the axis B of the swirl channel 4 E plane at an acute angle ⁇ of about 35 o.
  • There may also be a second, equally inclined air supply bore which then opens into the swirl duct 4 at a point diametrically opposite the mouth of the bore 9 and which is therefore not visible in the drawing.
  • the false twist unit is used in a nozzle spinning device which contains a pair of delivery rollers, of which only one delivery roller 10 is visible in the drawing.
  • the delivery roller pair is usually the output roller pair of a drafting system (not shown).
  • the delivery roller pair 10 delivers a staple fiber tape S into the intake duct 1, in which a suitable air speed is maintained by means of the vacuum source 6, to which the expansion chamber 2 is connected.
  • the compressed air introduced into the swirl duct 4 through the inclined air supply hole or bores 9 generates a suction effect in the swirl duct, which sucks the fibers through the throttle point 3.
  • the fibers are twisted together by the air currents in the swirl channel 4, and an incorrectly twisted yarn core 11 is formed, which extends into the area of the delivery rollers 10.
  • edge fibers F are fed into the fiber sliver S, which are sucked into the intake duct 1 and whose front ends are only gripped by the rotating yarn core 11 in the intake duct, generally before the narrowest point 1a.
  • the edge fibers F then wind with a slope on the yarn core 11, which is essential is greater than the pitch of the fibers in the core 11. It is desirable that the rear ends of the edge fibers F are then screwed into the spinning triangle 12 and finally come to rest in the yarn core 11.
  • the yarn formed is drawn off from the false twist unit by a pair of take-off rollers, not shown, of the nozzle spinning device, the false twist of the yarn core 11 largely dissolving.
  • the edge fibers F, the slope of which reverses, then form wrapping fibers on the yarn core, which give the yarn the necessary cohesion.
  • the slope of the air supply bore (s) 9 is significantly smaller than in known false twist units; As indicated, the angle ⁇ is only about 35 ° .
  • the speed of the air stream blown into the swirl duct 4 through the air supply bore 9 has a correspondingly smaller component in the axial direction of the swirl duct 4.
  • the suction effect generated by the air flow in the swirl duct 4 is sufficient to maintain a sufficiently high air speed through the throttle point 3.
  • the optimal air speed is generated by the vacuum source 6 connected to the expansion chamber 2.
  • the vacuum source 6 can also suck out purge air which is let in through the purge air inlet 7 into the expansion chamber 2 in order to prevent the attachment of fiber parts therein.
  • the speed of the air flow blown into the swirl duct 4 through the air supply bore 9 has a larger component in the circumferential direction of the swirl duct.
  • the air flow can therefore rotate the yarn running through the twist channel 4 correspondingly faster, that is, a higher yarn running speed is possible for an equally strong false twist in the yarn core 11.
  • the higher yarn running speed in turn leads to a higher yarn quality in that the peripheral speed of the delivery rollers 10 also ent speaking is higher.
  • Some air is always entrained from the peripheral surfaces of the rapidly rotating delivery rollers 10. On the exit side of the pair of delivery rollers, this air moves away from the clamping line K.
  • air must flow in from the sides in the region of the clamping line K, ie initially approximately parallel to the axes of the delivery rollers 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP89120069A 1988-11-07 1989-10-28 Falschdralleinheit für eine Düsenspinnvorrichtung Withdrawn EP0368108A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4134/88 1988-11-07
CH413488A CH676725A5 (ja) 1988-11-07 1988-11-07

Publications (1)

Publication Number Publication Date
EP0368108A1 true EP0368108A1 (de) 1990-05-16

Family

ID=4270472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89120069A Withdrawn EP0368108A1 (de) 1988-11-07 1989-10-28 Falschdralleinheit für eine Düsenspinnvorrichtung

Country Status (3)

Country Link
EP (1) EP0368108A1 (ja)
JP (1) JPH02175926A (ja)
CH (1) CH676725A5 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017081536A1 (en) 2015-11-10 2017-05-18 Gilbos N.V. Improved jet and method
ITUA20163006A1 (it) * 2016-04-29 2017-10-29 Savio Macch Tessili Spa Dispositivo di filatura di tipo air-jet
WO2017203376A1 (de) * 2016-05-26 2017-11-30 Maschinenfabrik Rieter Ag Garnbildungselement für eine vorspinnmaschine sowie damit ausgerüstete vorspinnmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7493749B2 (en) * 2003-11-11 2009-02-24 Maschinenfabrik Rieter Ag Spinning position with fiber guidance element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2722319A1 (de) * 1977-01-10 1978-07-13 Toyo Boseki Verfahren und vorrichtung zum herstellen von garnen
EP0121602A1 (de) * 1983-04-12 1984-10-17 Maschinenfabrik Rieter Ag Falschdralleinheit
EP0131170A1 (de) * 1983-07-01 1985-01-16 Maschinenfabrik Rieter Ag Verfahren und Vorrichtung zum Falschdrallspinnen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2722319A1 (de) * 1977-01-10 1978-07-13 Toyo Boseki Verfahren und vorrichtung zum herstellen von garnen
EP0121602A1 (de) * 1983-04-12 1984-10-17 Maschinenfabrik Rieter Ag Falschdralleinheit
EP0131170A1 (de) * 1983-07-01 1985-01-16 Maschinenfabrik Rieter Ag Verfahren und Vorrichtung zum Falschdrallspinnen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017081536A1 (en) 2015-11-10 2017-05-18 Gilbos N.V. Improved jet and method
US11053612B2 (en) 2015-11-10 2021-07-06 Gilbos N.V. Jet and method
ITUA20163006A1 (it) * 2016-04-29 2017-10-29 Savio Macch Tessili Spa Dispositivo di filatura di tipo air-jet
US10851478B2 (en) 2016-04-29 2020-12-01 Savio Macchine Tessili S.P.A. Air-jet type spinning device
WO2017203376A1 (de) * 2016-05-26 2017-11-30 Maschinenfabrik Rieter Ag Garnbildungselement für eine vorspinnmaschine sowie damit ausgerüstete vorspinnmaschine
US10900144B2 (en) 2016-05-26 2021-01-26 Maschinenfabrik Rieter Ag Roving-forming element for a roving machine as well as a roving machine equipped therewith

Also Published As

Publication number Publication date
JPH02175926A (ja) 1990-07-09
CH676725A5 (ja) 1991-02-28

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