WO1994004728A1 - Improved method and apparatus for open end yarn spinning - Google Patents
Improved method and apparatus for open end yarn spinning Download PDFInfo
- Publication number
- WO1994004728A1 WO1994004728A1 PCT/AU1993/000409 AU9300409W WO9404728A1 WO 1994004728 A1 WO1994004728 A1 WO 1994004728A1 AU 9300409 W AU9300409 W AU 9300409W WO 9404728 A1 WO9404728 A1 WO 9404728A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fibres
- assembly
- fibre
- zone
- assembly zone
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
- D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
- D01H4/16—Friction spinning, i.e. the running surface being provided by a pair of closely spaced friction drums, e.g. at least one suction drum
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
- D01H4/30—Arrangements for separating slivers into fibres; Orienting or straightening fibres, e.g. using guide-rolls
Definitions
- the invention relates to open end spinning of textile yarns at a high rate of production and improved quality whereby the staple fibres are transported as individual fibres in an air stream from a fibre opening device to a fibre assembly zone where the fibres are joined to the freely rotating tail of the forming yarn, and thereafter the fibre assembly twisted to form yarn.
- the forming yarn, with the coiled fibres, is withdrawn from the exhaust tube through the funnelled vortex to a withdrawal tube axially aligned with the exhaust tube.
- a supplementary twisting unit is located in the withdrawal tube. It is not feasible in such a system to add twist to that which is inserted vorticularly at the open end of the tail. Neither is it possible to synchronise the rotation of the open-end tail with the supplementary twisting unit. False twist therefore results from the supplementary twisting. Accordingly, true twist in the finished yarn will depend on the variable level of twist inserted at the yarn tail and so the yarn will be weak. Further the incidence of true twist insertion cannot be accumulated by increasing the rotational speed of the twisting unit above that inserted at the tail. The result is high production rates of high quality yarn is not achieved.
- a method of fibre assembly for open-end spinning of yarn by a twisting unit comprising delivering air entrained fibres into a defined assembly zone, maintaining a circumferential air flow around the air entrained fibres in the assembly zone, said circumferential air flow being of a pressure to radially compress the fibre assembly in the assembly zone, and being in the required direction of twist of the finished yarn as governed by the twisting unit, and withdrawing air from said assembly zone in the axial direction of entry of the fibres, and withdrawing the assembly of fibres formed in the assembly zone in the opposite axial direction to pass to the twisting unit.
- the assembly zone is formed by an internal cylindrical surface and the air flow enters the assembly zone in a direction substantially tangential to said cylindrical surface.
- the fibre laden air entering the assembly zone axially is encircled and radially squeezed by the circumferentially moving air, so the air-borne fibres, and the tail of the forming yarn that extends into the assembly zone, are substantially free of contact with the circumferential surface forming the assembly zone, and which is stationary.
- a continuous laying up of fibres and withdrawal of the fibre assembly is possible with the forming yarn having a true open end.
- the pressure of the encircling air compresses the fibre laden airstream to thereby promote the attachment of the fibres to the tail of the forming yarn and prevent fibres flying to waste, while simultaneously assisting the rotation of the tail of the forming yarn as an 'open-end'.
- the air which conveys the fibres to the assembly zone stripped of fibres that have adhered to the open ended rotating tail proceeds to the remote end of the assembly zone to a suction source, together with the pressured air.
- the outflowing airstream being in the opposite direction to the withdrawal of the fibre assembly, applies a beneficial axial tension to the fibre assembly to keep the fibres straight and thereby aiding the tensile strength of the yarn.
- the fibres are initially prepared in a conventional fibre opening device, such as a beater, and are then carried in an airstream, such as through a duct, to the fibre assembly area.
- the fibre assembly can be withdrawn axially into a friction spinning device such as that disclosed in Australian Patent 501999 or U.S. Patent 4091605, the disclosure in each of which is incorporated herein by reference.
- a duct delivering the air entrained fibres can be located at right angles to the passage defining the assembly zone, or less favourably, rearwardly inclined at an acute angle.
- the air stream and the fibres are subject to a sudden major change in direction in order to enter the fibre assembly zone. This has an adverse influence on the air and fibre flow causing turbulence and affecting the nature of the fibre assembly structure. It is not possible to align the fibre feed duct more directly with the assembly zone passage so that the flow would not be severely interrupted from a regular course, because of the constructional and design constraints imposed by the nature, the action, and the location of the rotating friction surfaces.
- a method of open-end spinning yarn from fibres including the steps of entraining the fibres in an air stream, delivering the entrained fibres to a fibre assembly zone, attaching the fibres in said assembly zone to a revolving fibre assembly tail, withdrawing the tail with the fibres attached thereto from the assembly zone in a direction opposite to the air flow in the fibre assembly zone, and passing the fibre assembly between two rotating friction surfaces of revolution and in contact with each thereof to impart twist to form a yam, characterised in that said fibre assembly zone is located within a duct having an axis aligned to pass between said friction surfaces and inclined to the plane of rotation thereof, said fibres being delivered into said fibre assembly duct at a location between the assembly zone and the rotating surfaces and at an angle not less than about 90° to the axis of the fibre assembly duct downstream of the junction with the fibre assembly duct.
- the fibres are conveyed to the fibre assembly duct along a path substantially parallel to the common plane of rotation of the respective members upon which the friction surfaces are formed.
- the friction surfaces are each equally and oppositely inclined to the axis of rotation, and arranged to define therebetween a gap through which the assembly of fibre is drawn, in contact with each friction surface, after leaving the assembly zone.
- the members on which the friction surfaces are provided rotate in opposite directions at the same peripheral speed so the "nip area", through which the assembly of fibres passes, retains a fixed position in axial alignment with the fibre assembly duct axis.
- the surface speeds of the friction surfaces graduate from slower to faster over the length of the gap from the entry end to the exit end.
- the axial friction between the fibre assembly and the friction surfaces is used advantageously to augment and facilitate the withdrawal of the fibre assembly by the propulsive screwing effect induced by the matching increase of surface velocities from the smaller to the larger end of the tapered friction surfaces.
- Figure 1 is a diagrammatic representation of the method of spinning fibres into yarn
- Figure 2 is an axial sectional view of the fibre assembly unit and friction twister and
- FIG 3 is a sectional view along line 3-3 in Figure 2.
- a sliver 1 of fibres is fed into a suitable beater 2 where the fibres are individually separated from the sliver and launched into an airstream.
- Various conventional types of beaters are known that may be used for this purpose.
- the rate of feed of the sliver is controllable, in the known manner, according to the specific requirement of the fibres, to match the required count of yarn being produced, and the offtake rate of the spun yarn.
- the fibres from the beater 2 are carried in an airstream through the duct 3 and delivered to the fibre assembly unit 4.
- the fibre assembly unit is one major aspect of the present invention and will be described in greater detail hereinafter. Air is withdrawn from the assembly unit via the duct 5 by the suction source 7.
- the assembly of fibres issuing from the unit 4 is passed to the friction twister unit 8 and the finished twisted fibre yarn is withdrawn from the twister unit 8 by the withdrawal rollers 11 and thereafter passed to the yarn reception spool 12.
- the separate fibres entrained in the air are carried by the duct 3 from the beater as shown in Figure 1 into the fibre assembly unit 4, comprising the tubular member 17, defining the central fibre assembly zone 16 of cylindrical form open at each end 20 and 21.
- the open end 20 communicates with the suction device 7 as seen in Figure 1
- the open end 21 communicates with the fibre supply duct 3, that delivers the fibres from the beater to the assembly zone.
- the shield 18, located in the area of the junction of the duct 3 and tubular member 17, is contoured to provide a smooth transition surface to change the direction of flow of the fibres from the duct 3 into the tubular member 17. Also the shield 18 prevents the incoming fibres from impinging upon and becoming prematurely attached to the fibre assembly moving from the assembly zone 16 to the twisting device 8 as will be discussed further hereinafter.
- the duct 3 is tapered so as to accelerate the air and fibres to achieve a straightening of the fibres from the disorientation condition that can exist on exiting from the beater. As a result, the fibres finally delivered into the assembly zone 16 are substantially straight and extend in a direction substantially parallel to the direction of the air flow.
- the fibres are spatially distributed at the larger entry end of the duct 3 and as the fibres and air flow accelerates towards the smaller delivery end, due to the reducing cross sectional area of the duct 3, straightening of the fibre occurs. At the same time the fibres are progressively condensed laterally. The resulting straightening, parallelising and layering of the fibres, and the protection of the fibre stream by a boundary layer of air, results in the mass of fibres assuming a rounded form similar to a hollow disconnected warp as they enter the assembly zone 16.
- the continuous cavity 25 is provided about the exterior of the tubular member 17 at the fibre assembly zone 16 (not shown) which is in communication via the passage 26 with a source of compressed air.
- the cavity 25 is in communication with the fibre assembly zone 16 through ports or slots 28 (see insert 'A' Figure 2) passing through the wall of the tubular member 17 in a tangential relation to the internal wall of the tubular member 17. At least two such ports or slots 28 are provided in diametrically opposite locations and in a common transverse plane to the axis of the assembly zone 16.
- a rotational air flow is created in the fibre assembly zone 16, by the disposition of the slots 28 and promotes the rotation of the assembly of fibres within the assembly zone 16 about the axis thereof.
- the tangential aspect of the ports or slots 28 is selected so that the direction of rotation imparted by the air to the fibre assembly is the same as the direction of twist as inserted by the twisting unit 8.
- the air entering through the ports or slots 28 is of a pressure sufficient to effect a compressive compacting of the fibres in a generally inward direction away from the wall of the tubular member 17 and towards the axis of the assembly zone 16.
- This action of the pressurised air establishes in addition to forming a condensed fibre assembly also provides a fibre free clearance between the fibre assembly and the internal surface of the tubular member 17 so that the fibre assembly can freely rotate as an open end.
- open end conditions are established for the tail of the forming yarn and the fibres being applied thereto.
- suction device 7 withdraws air from the assembly zone 16 towards the open end 20 of the tubular member 17, and thus an axial tension is maintained on the fibre during the assembly of the fibres. This beneficially assists in maintaining the fibres straight during the fibre assembly process.
- the condensed fibre assembly is withdrawn from the end 21 of the tubular member 17 through the axially aligned open end 29 of the shield 18 to enter the friction spinning or twisting device 8 such as that described in my prior U.S. Patent No. 4091605 and Australian Patent No. 501999, previously incorporated into this specification.
- the shield 18 is important in guiding the incoming fibres from the duct 3 to change direction to enter axially into the assembly zone 16 without impinging on the condensed fibre assembly being withdrawn to enter the twisting device.
- twisting device 8 comprises a stationary support base 50 forming part of the basic structure 35 and rotatably supports the outer friction ring 51 and inner friction ring 52.
- the outer friction ring 51 rotates about the axis 53 and the inner friction ring 52 about the axis 54, eccentric to the axis 53.
- the outer ring 51 has an internal frustro conical surface 55 concentric with the axis 53 and the inner ring 52 has an external frustro conical surface 56 coaxial with the axis 54.
- the angles of the respective cones are equal and the respective axes are arranged so that at one location a narrow gap therebetween is provided as indicated at 58.
- the assembly of fibres from the fibre assembly zone 16 is passed through this gap 61 to have twist applied thereto as referred to further hereinafter.
- the inner frusto conical surface 55 of the outer ring 51 is of a friction material, such as rubber, and the outer surface 56 of the inner ring 52 is of the same or similar friction material.
- the inner and outer surfaces 55 and 56 are arranged to be in frictional driving contact at 60 as seen in Figure 3.
- the inner ring 52 is coupled by the co-axial shaft 59 to the drive pulley 58 and the pulley can be coupled to a suitable drive motor such as an electric motor (not shown). This drive arrangement results the rings 51 and 52 rotating both so the conical surfaces move at the same peripheral speed in opposite directions.
- the fibre assembly passes between the inner and outer rings at 58 in frictional contact with the respective frictional surface whereby the fibre assembly is rolled on the axis thereof to apply true twist to the fibre assembly. Also because of the surfaces moving at the same peripheral speed, albeit in the opposite directions, the assembly of fibres will remain in a secure and constant location between the two surfaces.
- the location of the gap 61 is in alignment with the end 21 of the tubular member 17 and the guide tube 29, through which the fibre assembly is withdrawn from the assembly zone 16. It is also seen that the plane in which the rings 51 and 52 rotate is inclined with respect to the axis of the tubular member 17 and thereby allows the duct 3, that delivers the fibres into the tubular member 17, to be similarly inclined thereto. This provides for a smoother transition of the direction of travel of the fibres as they enter the tubular member 17 to pass to the assembly zone 16, and also shortens the distance between the assembly zone 16 and entrance to the gap 61 between the rotating friction surfaces 55, 56.
- the friction surfaces 55 and 56 are each inclined to their respective parallel axes of rotation, and as the fibre assembly enters the gap 61 at the smaller diameter end thereof, the fibre assembly is subjected to an increase in peripheral velocity of the friction surfaces as it passes from the small diameter entry end to the larger diameter exit of the gap 61.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9306915A BR9306915A (en) | 1992-08-18 | 1993-08-10 | Optimized process and apparatus for open end wire wiring |
AU46910/93A AU4691093A (en) | 1992-08-18 | 1993-08-10 | Improved method and apparatus for open end yarn spinning |
EP93917447A EP0668944A4 (en) | 1992-08-18 | 1993-08-10 | Improved method and apparatus for open end yarn spinning. |
JP6505670A JPH08500153A (en) | 1992-08-18 | 1993-08-10 | Improved method and apparatus for open end twist spinning |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPL4180 | 1992-08-18 | ||
AUPL418092 | 1992-08-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994004728A1 true WO1994004728A1 (en) | 1994-03-03 |
Family
ID=3776364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1993/000409 WO1994004728A1 (en) | 1992-08-18 | 1993-08-10 | Improved method and apparatus for open end yarn spinning |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0668944A4 (en) |
JP (1) | JPH08500153A (en) |
CN (1) | CN1102863A (en) |
BR (1) | BR9306915A (en) |
CZ (1) | CZ41395A3 (en) |
WO (1) | WO1994004728A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1012661C2 (en) * | 1999-07-21 | 2001-01-23 | Vepetex B V | Yarn and method for manufacturing a yarn with super absorbent fibers. |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100430538C (en) * | 2005-01-23 | 2008-11-05 | 青岛大学 | Transporting and condensing method for friction spinning |
CZ306287B6 (en) * | 2015-04-07 | 2016-11-16 | Rieter Cz S.R.O. | Method of terminating spinning on rotor spinning machine workstation |
CN116446090B (en) * | 2023-04-26 | 2024-01-12 | 河南省彩锦纺织有限公司 | Efficient spinning core-spun device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4091605A (en) * | 1976-02-23 | 1978-05-30 | Alan Nicholas Jacobsen | Method and apparatus for the twisting of yarn |
US4202163A (en) * | 1977-03-30 | 1980-05-13 | Barmag Barmer Maschinenfabrik Aktiengesellschaft | Spinning process and apparatus |
US4606187A (en) * | 1984-02-04 | 1986-08-19 | Hans Stahlecker | Fiber feeding air flow arrangement for open-end friction spinning |
US4696155A (en) * | 1985-06-18 | 1987-09-29 | Maschinenfabrik Rieter Ag | Friction spinning device containing a friction spinning means and method of use of the friction spinning device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2811882A1 (en) * | 1978-03-18 | 1979-10-04 | Barmag Barmer Maschf | OPEN-END SPINNING DEVICE |
DE3514904A1 (en) * | 1985-04-25 | 1986-10-30 | Fritz 7347 Bad Überkingen Stahlecker | Process and apparatus for the spinning of fibre material |
DE4007607A1 (en) * | 1990-03-09 | 1991-09-12 | Schubert & Salzer Maschinen | SPINNING METHOD AND DEVICE FOR PRODUCING A YARN |
-
1993
- 1993-08-10 JP JP6505670A patent/JPH08500153A/en active Pending
- 1993-08-10 BR BR9306915A patent/BR9306915A/en not_active Application Discontinuation
- 1993-08-10 WO PCT/AU1993/000409 patent/WO1994004728A1/en not_active Application Discontinuation
- 1993-08-10 CZ CZ95413A patent/CZ41395A3/en unknown
- 1993-08-10 EP EP93917447A patent/EP0668944A4/en not_active Withdrawn
- 1993-08-18 CN CN 93116441 patent/CN1102863A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4091605A (en) * | 1976-02-23 | 1978-05-30 | Alan Nicholas Jacobsen | Method and apparatus for the twisting of yarn |
US4202163A (en) * | 1977-03-30 | 1980-05-13 | Barmag Barmer Maschinenfabrik Aktiengesellschaft | Spinning process and apparatus |
US4606187A (en) * | 1984-02-04 | 1986-08-19 | Hans Stahlecker | Fiber feeding air flow arrangement for open-end friction spinning |
US4696155A (en) * | 1985-06-18 | 1987-09-29 | Maschinenfabrik Rieter Ag | Friction spinning device containing a friction spinning means and method of use of the friction spinning device |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN, C-365, page 28; & JP,A,61 063 728 (KYOWA KIKAI SEISHAKUSHO K.K.) 1 April 1986 (01.04.86). * |
See also references of EP0668944A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1012661C2 (en) * | 1999-07-21 | 2001-01-23 | Vepetex B V | Yarn and method for manufacturing a yarn with super absorbent fibers. |
WO2001006047A1 (en) * | 1999-07-21 | 2001-01-25 | Vepetex B.V. | Yarn and method for manufacturing a yarn containing super absorbent fibres |
US6576338B1 (en) | 1999-07-21 | 2003-06-10 | Vepetex B.V. | Yarn and method for manufacturing a yarn containing super absorbent fibers |
Also Published As
Publication number | Publication date |
---|---|
BR9306915A (en) | 1999-01-12 |
JPH08500153A (en) | 1996-01-09 |
CN1102863A (en) | 1995-05-24 |
EP0668944A4 (en) | 1995-09-06 |
EP0668944A1 (en) | 1995-08-30 |
CZ41395A3 (en) | 1995-09-13 |
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