EP0100192B1 - Procédé et dispositif pour la réalisation de fils textiles composés - Google Patents

Procédé et dispositif pour la réalisation de fils textiles composés Download PDF

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Publication number
EP0100192B1
EP0100192B1 EP83304165A EP83304165A EP0100192B1 EP 0100192 B1 EP0100192 B1 EP 0100192B1 EP 83304165 A EP83304165 A EP 83304165A EP 83304165 A EP83304165 A EP 83304165A EP 0100192 B1 EP0100192 B1 EP 0100192B1
Authority
EP
European Patent Office
Prior art keywords
yarn
roving
primary
drafting zone
primary yarn
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.)
Expired
Application number
EP83304165A
Other languages
German (de)
English (en)
Other versions
EP0100192A1 (fr
Inventor
Derek John Bird
John Beverley Sharp
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.)
Wira and Mather and Platt Ltd
Original Assignee
Wira and Mather and Platt Ltd
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 Wira and Mather and Platt Ltd filed Critical Wira and Mather and Platt Ltd
Priority to AT83304165T priority Critical patent/ATE25268T1/de
Publication of EP0100192A1 publication Critical patent/EP0100192A1/fr
Application granted granted Critical
Publication of EP0100192B1 publication Critical patent/EP0100192B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/36—Cored or coated yarns or threads
    • D02G3/367—Cored or coated yarns or threads using a drawing frame

Definitions

  • This invention relates to a method of and apparatus for producing a composite textile yarn.
  • Worsted yarns produced by spinning alone are usually not suitable for use as warp in weaving, and it is common practice therefore to twist together two singles yarns and use the resultant twisted or, as they are sometimes known, twofold yarns for weaving.
  • the opportunity is usually taken to remove faults such as slubs from the singles yarns prior to two-folding.
  • U.S. Patent No. 3070950 is concerned with the combination of a sliver of staple fibre with a preformed yarn but the yarn is not spaced from the sliver at the end of the drafting zone, and even if it were the arrangement would not produce the effect desired in the present invention because the preformed yarn is of continuous filament and would not be influenced by detwisting as is a staple fibre yarn.
  • a wrapping machine is described in French Patent No. 1515512 but this does not provide for the detwisting of the primary yarn nor means for breaking the secondary yarn on breaking of the primary.
  • a method of producing a composite textile yarn comprising thestep, whilst a roving is being passed through a drafting zone and spun into a secondary yarn, of introducing a previously prepared primary yarn of staple fibres having unidirectional twist alongside the roving towards the end of the drafting zone and twisting the primary yarn with the secondary yarn, characterised in that the direction of twist imparted to the composite yarn is such as to reduce the twist in the primary yarn and that the primary yarn is spaced from the roving at the end of the drafting zone as defined by the front roller nip.
  • the primary yarn is spaced laterally of the secondary yarn by between about 4 mm and 8 mm as they leave the front roller nip.
  • the primary yarn may be of a type which could not be readily be produced on a machine having a , drafting system similar to that through which the roving is passed, and thus if the drafting zone is one suitable for worsted, the primary yarn may, for example, be a cotton yarn.
  • apparatus for producing composite textile yarns comprising means for introducing a previously prepared primary yarn alongside a roving towards the end of a drafting zone whilst the roving is being passed through the drafting zone and spun into a secondary yarn, and means for twisting the primary yarn with the secondary yarn, characterised in that the means for introducing the primary yarn is a roving draft control means, which is located in the drafting zone adjacent the front roller nip and which has means for guiding the previously uni-directionally twisted primary yarn alongside but spaced from the roving, that the twisting means has a direction of rotation which is opposite to.
  • the front roller pair break detector means having a portion movable between a first position where it bears on the primary yarn and, on breakage of the primary yarn, a second position where it is capable of breaking the secondary yarn.
  • Fig. 1 shows partially and Fig. 2 shows schematically the drafting zone to be found between a roving supply creel and the spindle of a typical worsted ring spinning frame, that is to say a frame before modification to accommodate the method of the invention.
  • the drafting zone itself is defined as extending between the nips respectively of the back roller pair 1, 2 and the front roller pair 3, 4 and comprises a draft control unit 5 which has a so-called flume 6 projecting towards the nip of the front rollers.
  • a single end 7 of roving which may be twisted or twistless, is fed to the back roller nip from a creel-mounted bobbin or other supply schematically represented in Fig. 2 by block B and then passes through the draft control unit 5 and through the nip of the front rollers to an axially- rotating ring spindle schematically represented by the block 9.
  • the draft control unit 5 is slowly reciprocated horizontally in order to spread the area of contact of the rollers with the roving being spun, and in particular to reduce the wear on the top front roller 4 of which the surface may be relatively soft.
  • a further creel is required to be fitted to support, for each spindle 9, at least one bobbin or other package of previously spun yarn.
  • the means for mounting of the bobbins are not shown and are expected to be obvious to anyone skilled in the art of spinning machine manufacture.
  • one end 10 of primary yarn is taken from a bobbin schematically represented by block 11, and is passed through a tension device 12 mounted adjacent to the drafting zone and known per se. From the tension device the yarn is brought adjacent to but not in contact with the roving 7 by passing it into the draft control unit 5 through a slot 13 cut in a side wall of input guide 14, which is located to the rear of the draft control unit 5 and shown in more detail in Fig. 4.
  • the flume 6 provides an exit channel for the roving as in a conventional machine but, as shown in the rear view of the draft control unit 5 in Fig. 5, the draft control unit also has a guide element 15 for guiding the primary yarn against the side wall 17 of the channel as it passes out of the draft unit towards the front rollers. The thickness ofthe side wall 17 thus determines the critical spacing of the primary yarn from the drafted roving at the nip of the front rollers.
  • the primary yarn 10 is taken to the front roller nip and thence, on a first setting up of the operation, is piecened up with the secondary yarn being spun from the roving 7 so that together they form a composite yarn 16 which is then wound on a package of conventional type mounted on the spindle 9. Thereafter, as spinning proceeds, primary yarn and roving are each continuously drawn from their respective supplies and, after the drafting of the roving, are continuously twisted together at a position slightly below the front roller nip and wound on the package.
  • the direction of rotation of the spindle is such as to insert twist into the composite yarn in a direction opposite to that originally in the primary yarn. This arrangement appears to produce a better yarn than when the direction of rotation is such as to increase the twist in the primary yarn. It also has certain practical advantages, as will be described later.
  • the primary yarn and the roving being spun shall be close together at the front roller nip, at least so as not to place undue limitation on the extent of lateral traverse of the drafting unit as mentioned above, it is essential that they emerge from the front roller nip spaced apart. This allows each to rotate on its own axis under the influence of the spindle, with twist being removed from the primary yarn and being inserted into the secondary yarn, before they converge. Although the twist may be substantially removed from the primary yarn it does not break since the distance of the convergence point below the nip is very short relative to the length of the component fibres.
  • the amount of twist which is removed from the primary yarn and inserted into the secondary may be varied, depending on the nominal values of the twist of the primary and composite yarns, and also on the thickness of each component at any instant.
  • the effect of the individual rotation of each component prior to convergence is to bind any loose fibres on the surface of each yarn into the structure of the composite yarn which is thereby made suitable for use as, for example, a warp yarn in weaving.
  • the composite yarn is different from a conventional two-fold twisted yarn, it can be considered as equivalent to such a yarn in that it comprises, in effect, a yarn spun substantially as normally from a roving combined, in a manner which involves twisting, with a previously prepared yarn.
  • the appearance of the resultant composite yarn depends upon, among other things, the linear densities of the primary yarn and of the drafted roving, the amount and direction of twist in the primary and secondary yarns, the separation of the primary yarn from the roving at the front roller nip and the tension imparted by the tension unit 12, as well as the composition and colour of the component yarns.
  • the invention is susceptible of variations, and in particular it may be possible to introduce more than one primary yarn into a single roving.
  • the or each primary yarn is expected normally to be a singles yarn but may possibly itself be a two-fold or other composite yarn.
  • One advantage is that the previously prepared yarn can be cleared of slubs or other faults prior to the merging with the secondary yarn and thus there is a lower incidence of faults in the composite yarn. Moreover, such knots as need to be made following the clearing of faults in the composite yarn are found to be more secure. Again, the apparatus may have less need for an end break detector to prevent singles yarns being wound on the take-up package. If the roving breaks the twisting effect of the spindle 9 will run back solely into the primary yarn and it will normally become untwisted to a point at which the yarn will break.
  • the system allows for the production of yarns combining types of fibre such as cotton and wool which may not effectively be spun together in one drafting system.
  • the primary yarn may appear to varying degrees on the surface of the composite yarn.
  • a composite yarn with those fibres on the surface may be strengthened by the use of a secondary yarn of high strength.
  • a coarser fibre than normally employed for a particular yarn may be used for the roving, thereby achieving further economic advantage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Claims (4)

1. Méthode pour produire un fil textile composite comprenant, pendant qu'une mèche passe dans une zone d'étirage et est filée en un fil secondaire, la phase consistant à introduire un fil primaire de fibres qui a été précédemment préparé et qui présente une torsion unidirectionnelle à côté de la mèche vers la fin de la zone d'étirage, et à retordre le fil primaire avec le fil secondaire, caractérisée en ce que le sens de la torsion imprimée au fil composite est tel que la torsion du fil primaire diminue, et en ce qu'à la fin de la zone d'étirage, de fil primaire et la mèche sont écartés d'une distance déterminée par la ligne de pincement des rouleaux avant.
2. Méthode selon la revendication 1, dans laquelle le fil primaire est écarté latéralement du fil secondaire comme ils quittent la ligne de contact des rouleaux avant.
3. Méthode selon la revendication 2, dans laquelle l'écartement est compris entre 4 et 8 mm environ.
4. Appareil pour produire des fils textiles composites comprenant un moyen pour introduire un fil primaire précédemment préparé (10) à côté d'une mèche (7) vers la fin d'une zone d'étirage pendant que la mèche passe dans la zone d'étirage et est filée en un fil secondaire, et un moyen (9) pour retordre le fil primaire avec le fil secondaire, caractérisé en ce que le moyen pour introduire le fil primaire (10) est un moyen de contrôle d'étirage de mèche (5), qui est situé dans la zone d'étirage près de la ligne de pincement des rouleaux avant, et qui comporte un moyen pour guider le fil primaire (10), précédemment tordu unidirectionnellement, à côté de la mèche (7), mais écarté d'elle, en ce que le moyen de retordage (9) a un sens de rotation opposé à la torsion du fil primaire (10), et en ce qu'il est prévu, sous la paire de rouleaux avant (3, 4), un moyen détecteur de rupture dont une partie est mobile entre une première position où il porte sur le fil primaire (10) et, à la rupture du fil primaire, une seconde position où il peut rompre le fil secondaire.
EP83304165A 1982-07-24 1983-07-19 Procédé et dispositif pour la réalisation de fils textiles composés Expired EP0100192B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83304165T ATE25268T1 (de) 1982-07-24 1983-07-19 Verfahren und vorrichtung zur herstellung von mischgarn.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8221465 1982-07-24
GB8221465 1982-07-24

Publications (2)

Publication Number Publication Date
EP0100192A1 EP0100192A1 (fr) 1984-02-08
EP0100192B1 true EP0100192B1 (fr) 1987-01-28

Family

ID=10531888

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304165A Expired EP0100192B1 (fr) 1982-07-24 1983-07-19 Procédé et dispositif pour la réalisation de fils textiles composés

Country Status (3)

Country Link
EP (1) EP0100192B1 (fr)
AT (1) ATE25268T1 (fr)
DE (1) DE3369536D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2611749B1 (fr) * 1987-02-20 1989-05-26 Schappe Sa Fil a coudre multifilaments continu et son procede de fabrication

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990673A (en) * 1954-01-06 1961-07-04 Celanese Corp Process and apparatus for producing core yarns
US2740591A (en) * 1954-03-01 1956-04-03 Valdese Mfg Company Inc Parallel strand control for winders and the like
FR1193060A (fr) * 1958-03-04 1959-10-30 Francois Masurel Freres Ets Perfectionnements au procédé de fabrication d'un fil constitué par une âme de fibres discontinues emprisonnée dans des supports en fils continus
DE1201221B (de) * 1958-06-16 1965-09-16 Dorothea Rudolph Verfahren und Vorrichtung zur Herstellung eines Kerngarnes
US3070950A (en) * 1960-09-14 1963-01-01 Massachusetts Mohair Plush Com Method of producing a composite yarn
FR1515512A (fr) * 1966-03-22 1968-03-01 Niederer & Co Dispositif pour bancs d'étirage en vue de la production de fils guipés
US3722202A (en) * 1971-09-24 1973-03-27 Agriculture Spinning a filament-wrapped staple fiber core yarn
US3739564A (en) * 1972-04-24 1973-06-19 Deering Milliken Res Corp Yarn guide
DE3006863C2 (de) * 1980-02-23 1982-10-21 Saurer-Allma Gmbh, 8960 Kempten Vorrichtung zur Herstellung von Effektgarn
US4365464A (en) * 1981-01-28 1982-12-28 The United States Of America As Represented By The Secretary Of Agriculture Apparatus to uniformly control wrapping a filament around the surface of a spun core yarn during ring spinning

Also Published As

Publication number Publication date
ATE25268T1 (de) 1987-02-15
EP0100192A1 (fr) 1984-02-08
DE3369536D1 (en) 1987-03-05

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