US3537250A - Means for imparting twist to yarns - Google Patents

Means for imparting twist to yarns Download PDF

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Publication number
US3537250A
US3537250A US819160A US3537250DA US3537250A US 3537250 A US3537250 A US 3537250A US 819160 A US819160 A US 819160A US 3537250D A US3537250D A US 3537250DA US 3537250 A US3537250 A US 3537250A
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Prior art keywords
twist
head
yarn
trumpet
friction
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Expired - Lifetime
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US819160A
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English (en)
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Alexander W P Mackintosh
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Individual
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    • 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
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/04—Devices for imparting false twist
    • D02G1/08—Rollers or other friction causing elements

Definitions

  • a twist head for imparting twist to yarns has a central opening and trumpet-shaped ends each presenting an outwardly flared convex surface extending around an arc of 90.
  • a yarn travelling diagonally through the head in a direction transverse to its axis has its respectively opposite sides frictionally contacted by surface portions moving in opposite directions.
  • Each convex surface is grooved to receive a ring presenting a narrow friction-engendering surface area, the remainder of the convex surface being smooth.
  • the trumpet-shaped ends may be extensions of the rotor of an electric motor, preferably of the four-pole shaped pole type. A yarn being twisted passes through the rotor and the motor speed determines the degree of twist.
  • This invention relates to means for imparting twist to yarns, and has for its object to provide an improvement in a twist head of a previously proposed form comprising a rotary annular component having a relatively small central opening which extends axially and merges into and connects ends (constituting the opposite sides of the twist head), these ends being trumpet-shaped and each presenting an outwardly flared convex surface of annular form extending around an arc of substantially 90, the said surfaces and the intermediate central opening connecting them being so related that a yarn or thread caused to travel diagonally through the component in a direction transverse to its axis of rotation not only has its respectively opposite sides frictionally contacted by surface portions moving in respectively opposite directions, but is supported for the major part of the distance both between the outer perimeter of the trumpet-shaped flare at one side of the head and the geometrical centre of the latter and also between the said centre and the outer perimeter of the similar flare of the opposite side of the head, whereby the yarn is fully controlled within the twist head and the twist generated in the yarn is prevented from springing through the
  • thermoplastic synthetic yarns such, for instance, as a polyamide or a polyester yarn.
  • the friction-engendering sur' faces of twist heads of the previously proposed form may, with advantage, vary in character, depending on the particular positions occupied by the heads in a yarn twisting machine or apparatus and thus, in appropriate cases, according to the stages of development of the twist in the progress of yarns through heaters generally provided in such a machine or apparatus for setting yarns whilst travelling in the twisted condition.
  • the outwardly flared annular convex surface of each trumpet-shaped end of a twist head instead of being wholly or mainly of a uniform friction-engendering surface as heretofore, is adapted to present therearound only a comparatively narrow, and thus localised, effective friction-engendering surface area, the remainder of the convex surface being 'ice so smooth that the friction engendered thereby is practically negligible.
  • the said remainder of the convex surface is, for all practical intents and purposes a substantially nonfriction surface.
  • the said localised effective friction-engendering surface area at each end of the twist head is in the form of a narrow band or ring.
  • the quick starting and stopping of the twist heads may be facilitated by driving them independently,
  • the trumpetshaped ends of annular components constituting the twist heads may, in accordance with a further feature of the invention, form extensions of the rotors of separate electric motors. As far as is known this is the first time that a textile yarn has been passed through the rotor of an electric motor for the purpose of having twist imparted thereto to a degree determined by the speed of the rotor.
  • FIG. 1 is a cross-sectional view, partly in elevation, of a pulley-driven form of the improved twist head
  • FIG. .2 is a crosssectional view of a form of the improved twist head which itself incorporates an electric motor by which it is independently driven, and
  • FIG. 3 is a partly-exploded general perspective view of the twist head illustrated in FIG. 2.
  • the rotary annular component constituting the twist head TH comprises two coaxially and oppositely disposed elements 10 which, although initially separate, are rigidly connected together by an embracing bush 11, e.g., of Phosphor bronze. Small screws 12 are employed to secure the bush to the elements 10.
  • the central portion of the twist head TH thus assembled extends axially and merges into and connects the trumpet-shaped ends 10a forming the opposite sides of the head.
  • a relatively small central opening 13 in the said central portion merges into and connects outwardly flared convex surfaces 10b of annular form presented by the interiors of the trumpet-shaped ends 10a.
  • each end of axially extending central opening 13 and the outwardly flared convex surface of the adjoining trumpet-shaped end 10a extend around an arc of substantially
  • the middle portion of the central opening 13 is enlarged at 13a by virtue of recessing the inner end of each of the two abutted elements 10.
  • the bush 11 has combined therewith the inner rotary race 14a of a ball bearing 14 the stationary outer race 14b of which is in turn mounted within a housing 15.
  • a housing 15 In an appropriate extended part 15a of this housing 15 is formed a tapped hole into which is screwed the inner end of a correspondingly screw-threaded stud 16 by means of which the twist head TH can be secured in its position of use in a yarn or thread twisting machine or apparatus.
  • each of the two trumpet-shaped ends 10a of the twist head is circumferentially grooved at to receive an endless V-belt (not shown) by means of which the head is driven from a separate power source.
  • the outwardly flared annular convex surfaoe 10b of each of the trumpet-shaped ends 10a of the twist head TH instead of being wholly or mainly of a uniform friction-engendering surface as heretofore, is adapted to present only a comparatively narrow and thus localised friction-engendering surface area.
  • this localised friction-engendering area in each end 10a may be in the form of a narrow band of an extremely hard wearing material
  • the said area in the specific example illustrated is presented by the outermost portion 17a of the inner surface of a ring 17 which is set in an annular recess or groove within the trumpet-shaped end.
  • such a narrow band or the ring 17 may, if desired and as shown, be protuberant, i.e., raised slightly from the general curve of the outwardly flared convex surface b.
  • each narrow friction engendering band or the ring 17 may, as shown, be located approximately half way between the outer perimeter of the relevant trumpet-shaped flare 10b and the geometrical centre C of the twist head TH.
  • the friction-engendering bands or rings must essentially be of an extremely hard wearing material. It is at present believed that a ceramic or a suitably hard or hardened abrasion-resistant metal will be required to withstand wear from yarns or threads continuously running over the bands or rings.
  • a yarn or thread such as that designated Y, travelling in the direction of the arrows diagonally through the twist head TH and thus transversely to its axis a of rotation not only has its respectively opposite sides frictionally contacted by localised friction-engendering surface portions 17a moving in respectively opposite directions, but is also so supported by spaced portions of the outwardly flared convex surfaces 10b as to ensure its maximum contact with the friction rings 17.
  • the twist head TH illustrated in FIGS. 2 and 3 is similar to the twist head TH shown in FIG. 1. But in the twist head TI-I the two coaxial ends 10a are rigidly connected together by an embracing bush 18 having combined therewith the inner rotary races 19a of ball bearings 19. The outer stationary races 19b of these bearings are mounted within two spaced housing plates or blocks such as that clearly shown at 20 in FIG. 3.
  • twist head TH is driven by an electric motor constituting an actual. part of the head
  • any appropriate form of elec tric motor may be employed for this purpose, a four-pole shaded pole motor is found to be eminently satisfactory.
  • the rotor 21 of such a motor is interposed between the rotary ball bearing races 19:: and is secured to the bush 18.
  • the laminated stator of the motor, indicated at 22, is firmly clamped in position between pairs of lateral lugs 20a and 20b of the two housing plates or blocks 20.
  • the heads of bolts passed right through these pairs of lugs and interposed portions of the stator are designated 23.
  • the rotor rotates within the stator 22 and there are associated with the latter two magnetic field-inducing coils 24 and 25 disposed at respectively opposite sides of the said rotor.
  • the motor may conveniently be wholly encased within a casing 26 through which the outer portions of the trumpet-shaped ends 10a protrude.
  • stator is only about half an inch in width, this enabling a twist head to be kept desirably narrow and commensurately small in diameter.
  • the speed of a comparatively large number of motorised twist heads such as that just described incorporated into a yarn or thread twisting apparatus may be controlled by a frequency converter designed to change the cycles of the supply.
  • twist heads TH and TH are mounted to run on ball bearings, it is to be clearly understood that any other appropriate antifriction bearings capable of withstanding a high speed of the order of 6000 r.p.m. may be employed.
  • plain bearings providing they are of a suitable material to withstand such a high speed, will suffice.
  • a bearing in a magnetic field may be found to be satisfactory. Again, it would be possible to use a self-generating air bearing or even a bearing of the self-lubricating type.
  • Suitably disposed twist heads constructed in accordance with this invention enable progression twisting of yarns to take place in different angular directions. That is to say, such heads enable yarns to be satisfactorily twisted even when travelling through angular paths instead of along substantially straight paths as heretofore. These angular paths in turn enable the height of a yarn twisting machine or apparatus to be reduced to a minimum, and facilitate association with the twist heads of heaters for heating and thus setting the yarns whilst travelling in the twisted condition all as described in my copending US. patent application Ser. No. 611,920, filed J an. 26, 1967, now US. Pat. No. 3,451,206.
  • twist heads may advantageously also be incorporated into a complete yarn processing unit intimately associated with a knitting or other textile machine from which unit processed (false twisted) yarn is drawn upon by relevant instruments or elements of the machine intermittently and at varying speeds.
  • the twist heads may have combined therewith braking means of any appropriate character.
  • braking means may include electrically or/and electronically operated mechanical brakes adapted to hear, when applied, upon any convenient rotating parts of the twist heads, it is preferred to incorporate the electric motors of the twist heads in electric or/and electronic circuitry having means for effecting such a change in the characteristics of the current applied to the motors as to apply braking forces to the rotors thereof.
  • these means may function to convert A.C.
  • a twist head for imparting twist to yarns said head comprising a rotary annular component having a central opening which extends axially and merges into and connects trumpet-shaped ends each presenting an outwardly flared convex surface of annular form extending around an arc of substantially 90, the said surfaces and the intermediate central opening being so related that a yarn caused to travel diagonally through the component in a direction transverse to its axis of rotation not only has its respectively opposite sides frictionally contacted by surface portions moving in respectively opposite directions, but is supported for a substantial part of the distance both between the outer perimeter of the trumpet-shaped flare a one side of the head and the geometrical centre of the latter, and also between the said centre and the outer perimeter of the similar flare at the opposite side of the head, whereby the yarn is controlled within the twist head and the twist generated in the yarn is prevented from springing through the twist head and so being nullified, said head being characterised in that the outwardly fiared annular convex surface of each trumpet-shaped end is adapted to present therearound only
  • a twist head according to claim 1 wherein the said narrow and localised effective friction-engendering surface area at each end of the head is presented by an initially separate ring which is set in an annular groove formed in the outwardly fiared convex surface of the relevant trumpet-shaped end.
  • each narrow and localised effective friction-engendering surface area is protuberant in that it is raised slightly from the general curse of the relevant outwardly flared convex surface to ensure that the friction ring is fully effective upon a yarn entering or leaving the twist head.
  • each narrow and localised effective friction-engendering surface area is located approximately half way between the outer perimeter of the corresponding trumpet-shaped flare and the geometric centre of the twist head.
  • each of the trumpet-shaped ends is circumferentially grooved to receive a driving belt.
  • a twist head according to claim 1, wherein the trumpet-shaped ends constitute extensions of the rotor of an electric motor incorporated into the head whereby a yarn to be twisted passes through the said rotor and the degree of twist imparted is determined by the motor speed.
  • a motorised twist head according to claim 8 which incorporates a four-pole shaded pole motor.
  • a motorised twist head wherein the electric motor is incorporated in electric or/and electronic circuitry including means adapted to function, at desired times, to convert A.C. current normally applied to the stator coils into a counter DC. current of reduced voltage for the purpose of applying a braking force to the rotor.
  • a twist head for imparting twist to yarns said head comprising a rotary annular component having a central opening which extends axially and merges into and connects trumpet-shaped ends each presenting an outwardly flared convex surface of annular form extending around an arc of substantially the said surfaces and the intermediate central opening being so related that a yarn caused to travel diagonally through the component in a direction transverse to its axis of rotation not only has its respectively opposite sides frictionally contacted by surface portions moving in respectively opposite directions, but is supported for a substantial part of the distance both between the outer perimeter of the trumpet-shaped flare at one side of the head and the geometrical centre of the latter, and also between the said centre and the outer perimeter of the similar flare at the opposite side of the head, whereby the yarn is controlled within the twist head and the twist generated in the yarn is prevented from springing through the twist head and so being nullified, said head being characterised in that the trumpet-shaped ends constitute extensions of the rotor of an electric motor incorporated into the head, said motor including a stator in

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Manufacture Of Motors, Generators (AREA)
US819160A 1968-07-05 1969-04-25 Means for imparting twist to yarns Expired - Lifetime US3537250A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3218868 1968-07-05

Publications (1)

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US3537250A true US3537250A (en) 1970-11-03

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US819160A Expired - Lifetime US3537250A (en) 1968-07-05 1969-04-25 Means for imparting twist to yarns

Country Status (7)

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US (1) US3537250A (enrdf_load_stackoverflow)
CA (1) CA940392A (enrdf_load_stackoverflow)
CS (1) CS161856B2 (enrdf_load_stackoverflow)
FR (1) FR2012325A1 (enrdf_load_stackoverflow)
GB (1) GB1239412A (enrdf_load_stackoverflow)
IE (1) IE33072B1 (enrdf_load_stackoverflow)
NL (1) NL150863B (enrdf_load_stackoverflow)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656290A (en) * 1970-02-19 1972-04-18 Spinner Oy Curling sleeve
US3668855A (en) * 1970-06-22 1972-06-13 Leesona Corp Twister and method of twisting
US3668856A (en) * 1970-11-16 1972-06-13 Leesona Corp Friction twister element
US3670488A (en) * 1970-08-28 1972-06-20 Leesona Corp In-line friction twister and method of twisting
US3695020A (en) * 1970-05-06 1972-10-03 Leesona Corp Twister and method of twisting
US3719035A (en) * 1971-05-05 1973-03-06 R Gilchrist Textile apparatus
US3759024A (en) * 1971-06-01 1973-09-18 L Colton Method of and apparatus for imparting twist to yarns
US3782088A (en) * 1971-08-05 1974-01-01 Courtaulds North America Inc False twister
US3846966A (en) * 1971-10-29 1974-11-12 Platt International Ltd Twisting of textile filaments
US3869853A (en) * 1972-03-07 1975-03-11 Ici Ltd Friction bush
US3875734A (en) * 1972-02-08 1975-04-08 Dupeuble Jean Claude Friction false twisting device
US3879927A (en) * 1973-03-20 1975-04-29 Bayer Ag False twisting device
USRE28409E (en) * 1970-06-22 1975-05-06 Twister and method of twisting
US3901011A (en) * 1973-02-12 1975-08-26 Kugelfischer G Schaefer & Co False twisting apparatus
US3938314A (en) * 1974-05-10 1976-02-17 E. I. Du Pont De Nemours And Company False-twist texturing process with hollow friction twist tubes
JPS5188759A (ja) * 1975-01-27 1976-08-03 Kenshukuseikakoshinoseizohoho
US4055940A (en) * 1975-06-18 1977-11-01 Bayer Aktiengesellschaft Internal friction twist device
US4068457A (en) * 1976-07-13 1978-01-17 Intech Corporation Bi-component friction disc for yarn texturing
US4135356A (en) * 1977-07-18 1979-01-23 Du Pont Of Canada Limited Friction false twister
US4333307A (en) * 1974-09-10 1982-06-08 Kugelfischer Georg Schafer & Co. Friction rotor
US4372108A (en) * 1979-09-07 1983-02-08 A. Michael S.A. Rotary yarn guide for textile machines

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1180583A (fr) * 1956-09-18 1959-06-05 Scragg & Sons Procédé et dispositif pour imprimer une fausse torsion à un filament ou fil textile
CH378458A (fr) * 1961-04-17 1964-06-15 Spinner Oy Machine pour boucler du fil
DE1252321B (enrdf_load_stackoverflow) * 1961-06-16 1967-10-19

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1180583A (fr) * 1956-09-18 1959-06-05 Scragg & Sons Procédé et dispositif pour imprimer une fausse torsion à un filament ou fil textile
CH378458A (fr) * 1961-04-17 1964-06-15 Spinner Oy Machine pour boucler du fil
DE1252321B (enrdf_load_stackoverflow) * 1961-06-16 1967-10-19

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656290A (en) * 1970-02-19 1972-04-18 Spinner Oy Curling sleeve
US3695020A (en) * 1970-05-06 1972-10-03 Leesona Corp Twister and method of twisting
US3668855A (en) * 1970-06-22 1972-06-13 Leesona Corp Twister and method of twisting
USRE28409E (en) * 1970-06-22 1975-05-06 Twister and method of twisting
US3670488A (en) * 1970-08-28 1972-06-20 Leesona Corp In-line friction twister and method of twisting
US3668856A (en) * 1970-11-16 1972-06-13 Leesona Corp Friction twister element
US3719035A (en) * 1971-05-05 1973-03-06 R Gilchrist Textile apparatus
US3759024A (en) * 1971-06-01 1973-09-18 L Colton Method of and apparatus for imparting twist to yarns
US3782088A (en) * 1971-08-05 1974-01-01 Courtaulds North America Inc False twister
US3846966A (en) * 1971-10-29 1974-11-12 Platt International Ltd Twisting of textile filaments
US3875734A (en) * 1972-02-08 1975-04-08 Dupeuble Jean Claude Friction false twisting device
US3869853A (en) * 1972-03-07 1975-03-11 Ici Ltd Friction bush
US3901011A (en) * 1973-02-12 1975-08-26 Kugelfischer G Schaefer & Co False twisting apparatus
US3879927A (en) * 1973-03-20 1975-04-29 Bayer Ag False twisting device
US3938314A (en) * 1974-05-10 1976-02-17 E. I. Du Pont De Nemours And Company False-twist texturing process with hollow friction twist tubes
US4333307A (en) * 1974-09-10 1982-06-08 Kugelfischer Georg Schafer & Co. Friction rotor
JPS5188759A (ja) * 1975-01-27 1976-08-03 Kenshukuseikakoshinoseizohoho
US4055940A (en) * 1975-06-18 1977-11-01 Bayer Aktiengesellschaft Internal friction twist device
US4068457A (en) * 1976-07-13 1978-01-17 Intech Corporation Bi-component friction disc for yarn texturing
US4135356A (en) * 1977-07-18 1979-01-23 Du Pont Of Canada Limited Friction false twister
US4372108A (en) * 1979-09-07 1983-02-08 A. Michael S.A. Rotary yarn guide for textile machines

Also Published As

Publication number Publication date
DE1928073B2 (de) 1975-06-26
IE33072B1 (en) 1974-03-06
CS161856B2 (enrdf_load_stackoverflow) 1975-06-10
CA940392A (en) 1974-01-22
FR2012325A1 (enrdf_load_stackoverflow) 1970-03-20
GB1239412A (enrdf_load_stackoverflow) 1971-07-14
IE33072L (en) 1970-01-05
NL6908564A (enrdf_load_stackoverflow) 1970-01-07
DE1928073A1 (de) 1970-01-08
NL150863B (nl) 1976-09-15

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