EP0051050A1 - Bague de freinage pour un tambour délivreur de fil - Google Patents

Bague de freinage pour un tambour délivreur de fil Download PDF

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Publication number
EP0051050A1
EP0051050A1 EP19810850070 EP81850070A EP0051050A1 EP 0051050 A1 EP0051050 A1 EP 0051050A1 EP 19810850070 EP19810850070 EP 19810850070 EP 81850070 A EP81850070 A EP 81850070A EP 0051050 A1 EP0051050 A1 EP 0051050A1
Authority
EP
European Patent Office
Prior art keywords
fingers
drum
brake ring
base ring
section
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.)
Granted
Application number
EP19810850070
Other languages
German (de)
English (en)
Other versions
EP0051050B1 (fr
Inventor
Arao C/O Kasuga Denki Company Limited Kakinaka
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.)
Kasuga Denki Inc
Original Assignee
Kasuga Denki Inc
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 Kasuga Denki Inc filed Critical Kasuga Denki Inc
Publication of EP0051050A1 publication Critical patent/EP0051050A1/fr
Application granted granted Critical
Publication of EP0051050B1 publication Critical patent/EP0051050B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/364—Yarn braking means acting on the drum
    • D03D47/366—Conical
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/364—Yarn braking means acting on the drum
    • D03D47/365—Brushes

Definitions

  • the present invention relates to a brake ring for a yarn processing drum, and more particularly to a brake ring used for a yarn processing drum such as a weft reservoir and metering drum of a fluid-jet type shuttleless loom on which a weft provisionally wound around the drum is delivered, during picking motion, in the axial direction of the drum while passing through the gap between the drum and the brake ring inserted over the drum.
  • a brake ring used for a yarn processing drum such as a weft reservoir and metering drum of a fluid-jet type shuttleless loom on which a weft provisionally wound around the drum is delivered, during picking motion, in the axial direction of the drum while passing through the gap between the drum and the brake ring inserted over the drum.
  • Brake rings of the above-described type have been widely used in the field of textile industry in order to prevent excessive unwinding of the yarn from the drum, to restrict generation of snarls on the yarn under delivery, and to control the tension of the yarn.
  • a brush-type brake ring is publicly known as a typical example of such conventional brake rings.
  • This brake ring includes a plastic base ring section having an inner diameter somewhat larger than the outer diameter of the drum for which the brake ring is to be used, and brushes coupled to and juxtaposed along the inner periphery of the base ring section, said brushes having moderate rigidity and elasticity. Further, these brushes extend along an appropriate imaginary conical surface the bottom end of which is defined by the base ring section and top falls on the axial line of the circle defined by the base ring section. The brushes incline in the direction of rotation of the yarn to be unwound from the drum and delivered in the axial direction of the drum. Adjacent brushes overlap one another somewhat in the peripheral direction of the base ring section.
  • the brush-type brake ring of this construction cannot apply sufficient braking force on the yarn delivered from the drum depending on the type of the yarn to be processed. Deficient braking action tends to cause variation in yarn tension and formation of snarls on the yarn.
  • free fluffs flying around the brake ring intrude themselves into the gaps between the brushes and form clogs against smooth passage of the yarn, thereby paralysing the function of the brake ring.
  • attachement of a number of fine brushes to the base ring section requires vast labour and time.
  • a finger-type brake ring has already been proposed, in which rubber fingers are substituted for the brushes.
  • This finger-type brake ring has futher been modified by using plastics as the material.
  • This finger-type plastic brake ring is almost same in construction as the above-described brush-type brake ring, in which plastic fingers are substituted for the brushes and formed monolithically with the base ring section by plastic moulding.
  • this finger-type plastic brake ring well removes demerits inherent to the brush-type brake ring, it has its own disadvantage since its braking action is based on the operation of the plastic fingers only.
  • the braking force applied to the yarn by the finger--type plastic brake ring acting is a function of the elasticity of the plastic material and the relationship between the diameter of the imaginary circle defined by the points of the fingers and the outer diameter of the drum for which the brake ring is used. Further, the braking force should be adjusted in accordance with the type of the yarn such as the thickness and the kind of material.
  • the brake ring of this sort is often used for a weft reservoir and metering drum of a fluid-jet type shuttleless loom for tension control of the weft to be picked into the shed.
  • it is very rare to use one type of weft only.
  • such change in type of the brake ring can be practiced at the stage of the production only and cannot suffice imminent demand for the change at the mill. In order to remove this inconven- iency, it is necessary for users to keep at the mill even brake rings of the types which are not so frequently used in the production.
  • the brake ring comprises, in a monlithical construction formed by plastic moulding, a base ring section, a thin supporting wall section and a number of thin elongated fingers.
  • the base ring section has an inner diameter somewhat larger than the outer diameter of a drum over which the brake ring is to be inserted.
  • the supporting wall section extends along the inner periphery of the base ring section and the fingers extend from the fringe of the supporting wall section in a juxtaposed arrangement.
  • the supporting wall section and the fingers extend along a prescribed imaginary conical surface the bottom of which is defined by the inner periphery of the base ring section and top falls on the axial line of the base ring section.
  • the fingers incline in the direction of rotation of the yarn to be unwound from the drum and delivered in the axial direction of the drum. Adjacent fingers overlap somewhat one another in the peripheral direction of the base ring section. Further, the supporting wall section is provided, at positions between adjacent fingers, with cuts at prescribed intervals, which run in the extending direction of the fingers.
  • the brake ring is made up, in a monlithical construction formed by plastic moulding, of a base ring section 1, a thin supporting wall section 2 and a number of thin elongated fingers 3.
  • the base ring section 1 has an inner diameter D somewhat larger than the outer diameter of a drum for which the brake ring is to be used.
  • An imaginary conical surface C. is assumed whose bottom is defined by the inner periphery of the base ring section 1 and top P falls on an axial line L of the base ring section 1.
  • the thin supporting wall section 2 extends in axial direction over a prescribed distance from the inner periphery of the base ring section 1 along the above-described imaginary conical surface C.
  • the straight fingers 3 extend from the upper fringe of the supporting wall section 2 whilst being juxtaposed along the periphery of the supporting wall section 2. They also follow the imaginary conical surface C. These fingers 3 extend substantially in parallel to each other and incline in the direction of rotation R of the yarn to be unwound from the drum and delivered in the axial direction of the drum. Adjacent fingers 3 overlap one another in the peripheral direction of the base ring section 1.
  • the points of these fingers 3 in a free state should preferably be on a common plane normal to the above-described axial line L.
  • An imaginary circle defined by these points of the fingers 3 should preferably have its center on the axial line L and the diameter d of such an imaginary circle should be equal to or smaller than the outer diameter of the drum for which the brake ring is to be used.
  • cuts 21 are formed in the supporting wall section 2 at prescribed intervals at positions between adjacent fingers 3, which run in the extending direction of the fingers 3.
  • a cut 21 is provided for every fourth finger 3.
  • the interval, i.e. the number of fingers 3, between adjacent cuts 21 may be varied freely in accordance with requirement in actual process.
  • the finger-type brake ring of the above--described construction When the finger-type brake ring of the above--described construction is inserted over a drum such as a weft resevoir and metering drum for a fluid-jet type shuttleless loom, the points of the fingers 3 are placed in pressure contact with the peripheral surface of the drum whilst leaving an annular gap between the base ring section 1 and the drum, since the diameter d of the imaginary circle defined by the points of the fingers 3 is equal to or smaller than the outer diameter of the drum and the inner diameter of the base ring section 1 is larger than the outer diameter of the drum. Consequently, the yarn delivered through the gap sustains braking action by the brake ring.
  • the magnitude of this braking force is influenced by the elasticity of the plastic material used for the brake ring and the relationship between the diameter d of the imaginary circle defined by the points of the fingers 3 and the outer diameter of the drum.
  • the magnitude of the braking force is significantly influenced by the size of the interval between adjacent cuts 21 in the supporting wall section 2. The larger the interval, the larger the braking force acting on the yarn. That is, the magnitude of the braking force can be freely adjusted by varying the size of the interval between adjacent cuts 21 even when other factors remain constant.
  • the user is able to freely obtain optimum braking force for the yarn to be processed by adding further cuts 21 to the supporting wall section.
  • the thin construction of the supporting wall section enables easy formation of such additional cuts 21.
  • Two type of brake rings of the following design were prepared by plastic moulding, one for yarns of S-twists and the other for yarns of Z-twists. They were opposite in the inclining direction of the fingers.
  • the brake rings were inserted over weft reservoir and metering drums of same type for processing of yarns of different direction of twist.
  • Yarn tension can be deemed to be representative of braking force.
  • the braking force can be adjusted over the range of 5 to 40 g. by changing the size of the interval between adjacent cuts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP19810850070 1980-10-27 1981-04-16 Bague de freinage pour un tambour délivreur de fil Expired EP0051050B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15392380U JPS5774992U (fr) 1980-10-27 1980-10-27
JP153923/80U 1980-10-27

Publications (2)

Publication Number Publication Date
EP0051050A1 true EP0051050A1 (fr) 1982-05-05
EP0051050B1 EP0051050B1 (fr) 1984-03-14

Family

ID=15573038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810850070 Expired EP0051050B1 (fr) 1980-10-27 1981-04-16 Bague de freinage pour un tambour délivreur de fil

Country Status (2)

Country Link
EP (1) EP0051050B1 (fr)
JP (1) JPS5774992U (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483505A1 (fr) * 1990-11-02 1992-05-06 SOBREVIN Société de brevets industriels-Etablissement Dispositif pour livrer du fil
WO1994010075A1 (fr) * 1992-11-05 1994-05-11 Nuova Roj Electrotex S.R.L. Chargeuse de trame
US5497607A (en) * 1993-05-26 1996-03-12 Palitex Project-Company Gmbh Two-for-one twisting spindle with bristle ring for smoothing and tensioning threads

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2027851A1 (fr) * 1969-01-07 1970-10-02 Rosen Karl I J
FR2167519A5 (fr) * 1971-12-22 1973-08-24 Rosen Karl
FR2335440A1 (fr) * 1975-12-15 1977-07-15 Lawson Hemphill Dispositif tendeur de fil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2027851A1 (fr) * 1969-01-07 1970-10-02 Rosen Karl I J
FR2167519A5 (fr) * 1971-12-22 1973-08-24 Rosen Karl
FR2335440A1 (fr) * 1975-12-15 1977-07-15 Lawson Hemphill Dispositif tendeur de fil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483505A1 (fr) * 1990-11-02 1992-05-06 SOBREVIN Société de brevets industriels-Etablissement Dispositif pour livrer du fil
WO1994010075A1 (fr) * 1992-11-05 1994-05-11 Nuova Roj Electrotex S.R.L. Chargeuse de trame
US5577536A (en) * 1992-11-05 1996-11-26 Nuova Roj Electrotex S.R.L. Weft feeder for eliminating yarn tension peaks
US5497607A (en) * 1993-05-26 1996-03-12 Palitex Project-Company Gmbh Two-for-one twisting spindle with bristle ring for smoothing and tensioning threads

Also Published As

Publication number Publication date
EP0051050B1 (fr) 1984-03-14
JPS5774992U (fr) 1982-05-08

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