US3540202A - Yarn brake for twined yarns - Google Patents

Yarn brake for twined yarns Download PDF

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Publication number
US3540202A
US3540202A US755337A US3540202DA US3540202A US 3540202 A US3540202 A US 3540202A US 755337 A US755337 A US 755337A US 3540202D A US3540202D A US 3540202DA US 3540202 A US3540202 A US 3540202A
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US
United States
Prior art keywords
yarn
twist
guide
brake
coil
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 - Lifetime
Application number
US755337A
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English (en)
Inventor
Geert Jan Vermeulen
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.)
MAS FAB L TE STRAKE NV
Original Assignee
Strake Maschf Nv
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 Strake Maschf Nv filed Critical Strake Maschf Nv
Application granted granted Critical
Publication of US3540202A publication Critical patent/US3540202A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/26—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path
    • B65H59/32—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path the surfaces being urged away from each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • a yarn brake for twined yarns comprising a pair of relatively movable yarn guides each having yarn guide formations such as pins or eyelets.
  • One yarn guide is fixed and the other guide biassed such that it tends to move away from the fixed guide.
  • the movable guide is mechanically coupled to a coil in a magnetic field which is energized from an alternating current source with adjustable frequency and amplitude. The coil imparts to the movable yarn guide an adjustable vibration relative to the other yarn guide which periodically allows the twist of the yarn to pass through the yarn brake thereby opposing any back-up of twist.
  • the invention relates to a yarn brake for twined yarns, comprising a first yarn guide with pins or eyelets, which is so biassed with respect to a second yarn guide with pins or eyelets, that it tends to move away from the second yarn guide.
  • the output tension in a yarn can be made substantially independent of variations of the input tension, but these yarn brakes in general have the disadvantage that back-up of twist occurs with twined yarns.
  • the twist which initially is distributed evenly along the length of the yarn is shifted by the friction which the yarn experiences in the yarn brake, until the friction of the yarn has increased to such an extent, that it becomes able to surmount the friction in the yarn brake, whereupon the twist passes through the yarn brake.
  • the yarn leaving the yarn brake exhibits twist packages at some distance from one another, which is obviously undesirable.
  • the invention aims at providing a yarn brake which is not subject to this disadvantage.
  • a yarn brake according to the invention is provided with a coil in a magnetic field, which is coupled with the first yarn guide and is connected to an alternating current source with adjustable frequency and amplitude, whereby the coil imparts a vibration which is adjustable in frequency and amplitude to the first yarn guide with respect to the second yarn guide, whereby back-up of twist is opposed.
  • the yarn brake Due to the alternating current which is applied to the coil, the yarn brake opens and closes in an adjustable rhythm and to an adjustable degree, whereby the twist is enabled with sufficiently short intervals to pass through the yarn brake, so that no back-up of twist occurs.
  • the amplitude of the alternating current must be kept sufliciently small for maintaing the'sta'bilizing influence of the yarn brake on the tension in the yarn after the yarn brake.
  • the invention is further elucidated below with reference to the drawing, which shows an embodiment of a yarn brake according to the invention.
  • FIG. 1 is a diagram of a yarn with evenly distributed twist.
  • FIG. 2 is a diagram of a yarn in which back-up of twist has occurred.
  • FIG. 3 is a block diagram of a yarn brack according to the invention.
  • An evenly twisted yarn in general has a configuration as shown in FIG. 1 and this configuration should be 'lranaiiitained also after passing the yarn through the yarn ra e.
  • the occurrence of back-up of twist can be prevented with a device as shown in FIG. 3, in which the twisted yarn 3 is slung around the pins 4 of a first yarn guide 5 and the pins 6 of a movable second yarn guide 7.
  • the pins 4 and 6 can be replaced by eyelets through which the yarn 3 is passed.
  • the movable yarn guide 7 is so biassed with respect to the fixed yarn guide 5, that it tends to move away from the fixed yarn guide.
  • the movable yarn guide 7 is coupled with a coil 8 in a magnetic field, e.g. designed as a moving coil to which an alternating current is applied for an alternating current source 9 with adjustable frequency, through a rheostat 10 for adjusting the amplitude.
  • the coil 8 and the yarn guide 7 coupled with it thereby vibrate with respect to the fixed yarn guide 5.
  • This vibration opens and closes the yarn brake at a high rate, whereby the twist of the yarn 3 is periodically allowed to pass through the yarn brake without back-up occurring.
  • the frequency of the alternating current source 9 must obviously be higher as the speed of the yarn 3 and the twist pitch are higher. A good operation is in most cases ensured if the frequency of the alternating current source 9 is chosen so high, that the yarn during a period of the alternating current moves along a distance not exceeding the distance over which a half twist revolution in the yarn 3 occurs.
  • the bias of the movable yarn guide 7 can generally be obtained in any desired way. Due to the presence of the coil 8 with a view to the vibration to be imparted to the yarn guide 7, there is a possibility of effecting the bias by applying not only an alternating current to the coil 8, but also a direct current, which can be supplied e.g. by a direct current source 11 through a rheostat 12. In this way, a very simple yarn brake can be obtained, which causes no or almost no back-up of twist.
  • a yarn brake for twined yarns comprising a pair of yarn guides each having yarn guide formations, one of said yarn guides being so biassed with respect to the other that it tends to move away from said other yarn guide, a coil in a magnetic field coupled with said one yarn guide and connected to an alternating current source with adjustable frequency and amplitude, whereby the coil imparts to said one yarn guide a vibration relative to said other yarn guide which is adjustable in frequency References Cited and amplitude, whereby back-up of twist is opposed.
  • UNITED STATES PATENTS 2.
  • a yarn brake according to claim 2 wherein the 3,067,563 12/1962 Van D131? 57 34 5 3,238,591 3/1966 Rosenstem 281.6

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  • Knitting Machines (AREA)
US755337A 1967-09-12 1968-08-26 Yarn brake for twined yarns Expired - Lifetime US3540202A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL676712483A NL145819B (nl) 1967-09-12 1967-09-12 Garenrem voor getwijnde garens.

Publications (1)

Publication Number Publication Date
US3540202A true US3540202A (en) 1970-11-17

Family

ID=19801177

Family Applications (1)

Application Number Title Priority Date Filing Date
US755337A Expired - Lifetime US3540202A (en) 1967-09-12 1968-08-26 Yarn brake for twined yarns

Country Status (2)

Country Link
US (1) US3540202A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL145819B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0326784A1 (de) * 1988-01-15 1989-08-09 Gebrueder Loepfe Ag Verfahren zur Abbremsung eines laufenden fadenartigen Gebildes und Fadenbremse zur Durchführung des Verfahrens

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2943377A (en) * 1959-06-29 1960-07-05 Elwood Res Company Method and apparatus for crimping filaments
US3067563A (en) * 1958-05-24 1962-12-11 American Enka Corp Method and apparatus for texturizing yarn
US3238591A (en) * 1963-09-17 1966-03-08 Spunize Company Of America Inc Yarn twist control apparatus and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067563A (en) * 1958-05-24 1962-12-11 American Enka Corp Method and apparatus for texturizing yarn
US2943377A (en) * 1959-06-29 1960-07-05 Elwood Res Company Method and apparatus for crimping filaments
US3238591A (en) * 1963-09-17 1966-03-08 Spunize Company Of America Inc Yarn twist control apparatus and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0326784A1 (de) * 1988-01-15 1989-08-09 Gebrueder Loepfe Ag Verfahren zur Abbremsung eines laufenden fadenartigen Gebildes und Fadenbremse zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
NL145819B (nl) 1975-05-15
NL6712483A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-03-14

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