US3578256A - Yarn brake of the sling type - Google Patents

Yarn brake of the sling type Download PDF

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Publication number
US3578256A
US3578256A US748341A US3578256DA US3578256A US 3578256 A US3578256 A US 3578256A US 748341 A US748341 A US 748341A US 3578256D A US3578256D A US 3578256DA US 3578256 A US3578256 A US 3578256A
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US
United States
Prior art keywords
yarn
coil
guide
movable
yarn brake
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
US748341A
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English (en)
Inventor
Geert J 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.)
Machinefabriek 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
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Publication of US3578256A publication Critical patent/US3578256A/en
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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
    • B65H59/34—Surfaces movable automatically to compensate for variation in tension
    • 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 of the sling type comprising a pair of yarn guides each having yarn guide formations.
  • One of the yarn ides is movable and biased for movement away from the 0 er by suitable means such as a coil mechanically cou pled to the guide, to which coil direct current is applied and which is suspended in a magnetic field.
  • a second coil in a magnetic field is mechanically coupled to the movable yarn guide for generating a voltage according to the velocity of movement of the guide. The voltage can be applied to a detector which in turn signals undesirably large fluctuations or movements in the guide.
  • the invention relates to a yarn brake of the sling type, with a first yarn guide with pins or eyelets, which is movable with respect to a second yarn guide with pins or eyelets and which is subjected to such a setting force, that it tends to move away from the second yarn guide.
  • Such yarn brakes usually are used on warping equipment for providing a constant tensile force at the output end of the yarn passed through the yarn brake, independent upon fluctuations at the input end which are caused by unwinding cones and the like. Since the warping machine must be stopped as soon as possible when a yarn breakage occurs, the warping machine moreover is usually provided with a plurality of yarn guards, which provide an alarm signal as soon as a yarn breakage occurs.
  • warping machines Since moreover slubs must be removed from the yarns, for which purpose the machine must also be stopped, warping machines further are usually provided with slub detectors, which provide an alarm signal as soon as a slub passes.
  • the invention aims at providing a yarn brake which can also serve as yarn guard and as slub detector, without requiring the yarn to be passed through separate devices.
  • a yarn brake of the kind referred to is characterized by a coil in a magnetic field, which is mechanically coupled with the first yarn guide and which generates a voltage which is dependent upon the velocity of movement of the coil.
  • a yarn brake of the sling type variations of the input tensile force of the yarn are compensated by automatically controlled movements of the two yarn guides with respect to one another, whereby the embracing angle of the pins or eyelets varies and consequently the friction experienced by the yarn varies, so that notwithstanding a variable input tensile force, the output tensile force is constant.
  • the movements of the yarn guides stay within certain limits, whereby the voltage generated in the coil also stays within certain limits.
  • the yarn guide movements are also unusually violent and the coil generates a larger output voltage than during normal operation, which can also cause a detector connected to the coil to respond.
  • a yarn brake of the sling type is therefor able to execute not only its own inherent function, but can also serve as yam guard and slub detector, provided that the movable yarn guide is coupled mechanically with a coil in a magnetic field.
  • the invention is further elucidated below with reference to the drawing, which shows in FIGS. 1 and 2 two embodiments of a yarn brake according to the invention.
  • the yarn 1 is passed around the pins 2 of a stationary yarn guide 3 and the pins 4 of a movable yarn guide 5.
  • the movable yarn guide 5 is biased against the force exerted by the yarn 1 by a suitable device, such as a moving coil 6 to which a direct current is applied from the terminals 7 and 8 and which is suspended in a magnetic field.
  • a moving coil 9 is also coupled with the movable yarn guide 5 and this coil is also suspended in a magnetic field. In the moving coil 9 a voltage is induced which is dependent upon the velocity of movement of the moving coil 9 in the magnetic field and which, therefore, is dependent upon the velocity of movement of the movable yarn guide 5.
  • This output voltage can be obtained between the terminals 8 and 10 and can be applied to a detector which provides an output signal as soon as the peak-to-peak value of the output voltage of the moving coil 9 exceeds a predetermined value. This is the case if due to incorrect unwinding or other causes, the input tensile force of the yarn l fluctuates to an unacceptable degree, whereby the movements of the movable yarn guide 5 are also unacceptably violent.
  • the detector can be designed so as to provide an output signal if the instantaneous value of the voltage induced in the moving coil 9 exceeds a predetermined limit as a consequence of this voltage peak.
  • the detector connected to the moving coil 9 can be so designed as to provide an output signal if the instantaneous value of the voltage induced in the moving coil exceeds a predetermined value in that direction.
  • the device for exerting a bias on the movable yarn guide 5 need not necessarily consist of a moving coil 6 and a dif-' ferently designed coil or a mechanical device can also be used for that purpose. If the bias is provided by a coil which is mounted in a magnetic field, it is in fact not necessary to couple a separate moving coil 9 with the movable yarn guide 5 for providing the desired output voltage. It is also possible to use the voltages which the movements induce in the biasing coil 6 proper. For that purpose, and as shown in FIG. 2, these output voltages can be derived from the moving coil 6 through a capacitor 11 and the terminals 8 and 12, in which case the moving coil 9 is superfluous. The capacitor 11 serves for suppressing the voltage which the driving current originating from the terminals 7 and 8 generates in the moving coil 6 and moreover, it increases the differentiating action.
  • neither the biasing coil nor the detector coil need be designed as a moving coil. Instead, they can also be designed as coils which are so coupled with the movable yarn guide 5, that they move linearly in a magnetic field, or they can be designed as stationary coils which cooperate with a core coupled with the movable yarn guide 5.
  • a yarn brake of the sling type having a pair of yarn guides each having yarn guide formations, one of said yam guides being movable with respect to the other and means biasing said one yarn guide for movement away from the other, said yarn brake characterized by a coil in a unidirectional magnetic field mechanically coupled for movement with said movable yarn guide, said coil generating a voltage according to the velocity of movement thereof.
  • a yarn brake according to claim 1 including a detector connected to said coil to provide a signal when the voltage induced in the coil exceeds a predetermined peak-to-peak value.
  • a yarn brake according to claim 2 including a detector connected to said coil to provide a signal when the voltage induced in the coil exceeds a predetermined peak-to-peak value.
  • a yarn brake according to claim 1 including a detector connected to said coil to provide a signal when the instantaneous voltage induced in the coil departs from a predetennined voltage range.
  • a yarn brake according to claim 2 including a detector connected to said coil to provide a signal when the instantaneous voltage induced in the coil departs from a predetermined voltage range.

Landscapes

  • Tension Adjustment In Filamentary Materials (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
US748341A 1967-09-12 1968-07-29 Yarn brake of the sling type Expired - Lifetime US3578256A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6712482A NL6712482A (enrdf_load_stackoverflow) 1967-09-12 1967-09-12

Publications (1)

Publication Number Publication Date
US3578256A true US3578256A (en) 1971-05-11

Family

ID=19801176

Family Applications (1)

Application Number Title Priority Date Filing Date
US748341A Expired - Lifetime US3578256A (en) 1967-09-12 1968-07-29 Yarn brake of the sling type

Country Status (3)

Country Link
US (1) US3578256A (enrdf_load_stackoverflow)
DE (1) DE1785177B2 (enrdf_load_stackoverflow)
NL (1) NL6712482A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523440A (en) * 1982-10-08 1985-06-18 Institut Textile De France Regulating device for the length of thread absorbed by a knitting machine
US4620571A (en) * 1984-07-24 1986-11-04 Fisher-Baker Corporation Skeining apparatus
EP0326784A1 (de) * 1988-01-15 1989-08-09 Gebrueder Loepfe Ag Verfahren zur Abbremsung eines laufenden fadenartigen Gebildes und Fadenbremse zur Durchführung des Verfahrens
EP1129974A3 (de) * 2000-02-29 2002-11-13 W. Schlafhorst & Co. Vorrichtung zur Steuerung der Fadenzugkraft eines laufenden Fadens in einer automatischen Wickeleinrichtung
CN111517153A (zh) * 2020-04-21 2020-08-11 张瑜 一种纺织品生产纺织架的调节机构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2222847A (en) * 1939-06-06 1940-11-26 Sipp Eastwood Corp Yarn control means
US2237112A (en) * 1939-12-02 1941-04-01 Nat Pneumatic Co Reeling mechanism
US2275192A (en) * 1939-12-16 1942-03-03 Gen Electric Control system
US2618445A (en) * 1949-11-09 1952-11-18 Josef Sailer Maschinenfabrik Yarn brake
US2754071A (en) * 1949-08-03 1956-07-10 Reiners Walter Thread tensioning device
CH370992A (it) * 1958-06-13 1963-07-31 Coll Poletti & Osta Soc Dispositivo per regolare e mantenere constante la tensione di un nastro, filo, ecc. in corso di avvolgimento o di svolgimento

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2222847A (en) * 1939-06-06 1940-11-26 Sipp Eastwood Corp Yarn control means
US2237112A (en) * 1939-12-02 1941-04-01 Nat Pneumatic Co Reeling mechanism
US2275192A (en) * 1939-12-16 1942-03-03 Gen Electric Control system
US2754071A (en) * 1949-08-03 1956-07-10 Reiners Walter Thread tensioning device
US2618445A (en) * 1949-11-09 1952-11-18 Josef Sailer Maschinenfabrik Yarn brake
CH370992A (it) * 1958-06-13 1963-07-31 Coll Poletti & Osta Soc Dispositivo per regolare e mantenere constante la tensione di un nastro, filo, ecc. in corso di avvolgimento o di svolgimento

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523440A (en) * 1982-10-08 1985-06-18 Institut Textile De France Regulating device for the length of thread absorbed by a knitting machine
US4620571A (en) * 1984-07-24 1986-11-04 Fisher-Baker Corporation Skeining apparatus
EP0326784A1 (de) * 1988-01-15 1989-08-09 Gebrueder Loepfe Ag Verfahren zur Abbremsung eines laufenden fadenartigen Gebildes und Fadenbremse zur Durchführung des Verfahrens
US4927093A (en) * 1988-01-15 1990-05-22 Gebrueder Loepfe Ag Method for braking a moving thread-like material and thread brake for carrying out said method
EP1129974A3 (de) * 2000-02-29 2002-11-13 W. Schlafhorst & Co. Vorrichtung zur Steuerung der Fadenzugkraft eines laufenden Fadens in einer automatischen Wickeleinrichtung
US6511012B2 (en) 2000-02-29 2003-01-28 W. Schlafhorst Ag & Co. Apparatus for controlling the tension of a traveling yarn in an automatic winding device
CN111517153A (zh) * 2020-04-21 2020-08-11 张瑜 一种纺织品生产纺织架的调节机构

Also Published As

Publication number Publication date
DE1785177B2 (de) 1972-07-20
DE1785177A1 (de) 1972-01-05
NL6712482A (enrdf_load_stackoverflow) 1969-03-14
DE1785177C3 (enrdf_load_stackoverflow) 1975-01-30

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