US20020020163A1 - Yarn twist retention member on an open-end spinning machine - Google Patents

Yarn twist retention member on an open-end spinning machine Download PDF

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Publication number
US20020020163A1
US20020020163A1 US09/860,306 US86030601A US2002020163A1 US 20020020163 A1 US20020020163 A1 US 20020020163A1 US 86030601 A US86030601 A US 86030601A US 2002020163 A1 US2002020163 A1 US 2002020163A1
Authority
US
United States
Prior art keywords
yarn
bent
delivery channel
longitudinal groove
wall
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.)
Abandoned
Application number
US09/860,306
Other languages
English (en)
Inventor
Ladislav Slezak
Oldrich Tesar
Jaroslav Jirges
Milos Mladek
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.)
Rieter Elitex AS
Original Assignee
Rieter Elitex AS
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 Rieter Elitex AS filed Critical Rieter Elitex AS
Assigned to RIETER ELITEX A.S. reassignment RIETER ELITEX A.S. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JIRGES, JAROSLAV, MLADEK, MILOS, SLEZAK, LADISLAV, TESAI, OLDRICH
Publication of US20020020163A1 publication Critical patent/US20020020163A1/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/40—Removing running yarn from the yarn forming region, e.g. using tubes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/08—Twist arresters

Definitions

  • the invention relates to a yarn twist retention member on an open-end spinning machine comprising a part of a wall of a bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel, this section of the wall of the bent yarn delivery channel on the yarn twist retention member being provided with at least one yarn twist retaining means.
  • a yarn twist retention member on a open-end spinning machine made as an independent body comprising a part of a wall of a bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel, said body being inserted into a piece containing the remaining part of the bent section of the bent yarn delivery channel and, as the case may be, also the whole remaining part of the bent yarn delivery channel.
  • the yarn twist retention member is fitted with a couple or a three-member configuration of transverse rounded protrusions serving as yarn twist retention means on which the yarn, while being delivered out of the spinning rotor, is bent and the yarn twist retained due to its friction on said protrusions.
  • the patent CZ No. 276 522 discloses a yarn delivery funnel fitted in its cavity, through which the yarn passes while being delivered, with a twist braking segment fitted with two run-up surfaces.
  • the upper part of the braking segment contains a wedge-shaped groove whose bottom lies outside the axis of the yarn delivery funnel.
  • the drawback of this arrangement consists in the housing of a separate braking segment in the cavity of the yarn delivery funnel where it must be seated relatively tightly so that it is not easily exchangeable.
  • Another drawback consists also in a relatively small length of the wedge-shaped groove in the braking segment so that the retention effect exerted by such a braking segment is correspondingly limited.
  • the invention aims at creating a yarn twist retention member marked by simple design, easy exchangeability, and high yarn twist retention capacity.
  • the aim of the invention has been achieved by a yarn twist retention member on an open-end spinning machine whose principle consists in that the yarn twist retention means is made as a longitudinal groove in a part of the wall of a bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel, the walls of the longitudinal groove being situated symmetrically to each other along the longitudinal symmetry plane of the bent section of the bent yarn delivery channel.
  • Such yarn twist retention member is simple in design, simply exchangeable, and highly efficient in the yarn twist retention.
  • the longitudinal groove made in the part of the wall of the bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel has the profile of the letter “V”.
  • each of the walls of the longitudinal groove made in the part of the wall of the bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel has the profile consisting of a pair of mutually inclined sections.
  • the profile of the walls of the longitudinal groove made in the part of the wall of the bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel is a convex one.
  • the profile of the walls of the longitudinal groove made in the part of the wall of the bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel is a concave one.
  • the walls of the longitudinal groove made in the part of the wall of the bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel to have a surface roughness between R a 16 and R a 0,1.
  • the walls of the longitudinal groove made in the part of the wall of the bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel to have in the length direction of the longitudinal groove at least two different surface roughness values R a .
  • the walls of the longitudinal groove made in the part of the wall of the bent yarn delivery channel forming the inner side of the bent section of the bent yarn delivery channel have at their width portions adjacent to the bottom of the longitudinal groove a surface roughness R a superior to the surface roughness R a of the portions more distant from the bottom of the longitudinal groove.
  • the yarn twist retention member according to the invention has high yarn twist retention capacity on the yarn being spun while at the same time being very sensitive to the yarn surface suffering no damage from it.
  • the yarn twist retention member according to the invention substantially improves the quality of the spun yarn as compared with the yarn twist retention members according to the background art when used under comparable technological parameters.
  • FIG. 1 is an example of the overall arrangement of the yarn twist retention member and of the delivery tube in the spinning unit body
  • FIG. 2 a is a lateral view of the yarn twist retention member
  • FIG. 2 b is a view of the yarn twist retention member from the side of the inner side of the bent section of the bent yarn delivery channel
  • FIGS. 3 a to d are examples of embodiment of the yarn twist retention member.
  • the retention member 1 of the yarn 2 twist on an open-end spinning machine is a component of the spinning unit of an operating unit of the open-end spinning machine which machine comprises at least one row of operating units, each of which equipped with a site for a sliver can and a spinning unit related thereto with well-known mechanisms for processing the sliver band into the yarn 2 in a spinning rotor 3 .
  • the yarn 2 intended to be delivered from the spinning rotor 3 and to be wound on a not represented bobbin passes through a delivery funnel 4 of the yarn 2 and further on through a bent delivery channel 5 of the yarn 2 in whose bent section 50 the retention member 1 of the yarn 2 twist is situated.
  • the bent delivery channel 5 of the yarn 2 can be made in various ways, for instance, as shown in FIG. 1, so that a first body 6 , comprising a part of the wall of the bent yarn delivery channel constituting the outer side 500 of the bent section 50 of the bent yarn delivery channel 5 houses seated therein the yarn 2 twist retention member 1 comprising a part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 fitted with the yarn 2 twist retention member 1 .
  • the thus created bent section 50 of the bent yarn 2 delivery channel 5 has related thereto one end of a direct delivery tube 7 of the yarn 2 whose the other end defines the position of the outlet site of the yarn 2 from the spinning unit.
  • the bent yarn 2 delivery channel 5 can be produced in such a manner that the first body 6 containing a part of the wall of the bent yarn 2 delivery channel 5 constituting the outer side 500 of the bent section 50 of the bent yarn 2 delivery channel 5 and the delivery tube 7 of the yarn 2 are made as a single common body in which there is seated the yarn 2 twist retention member 1 comprising a part of the wall of the bent yarn delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 .
  • the yarn 2 twist retention member 1 is secured in its operative position against unwanted loosening.
  • the bent yarn 2 delivery channel 5 can be in a suitable way equipped with a one-piece inlet ring 51 or with a two-piece inlet ring 51 whose one part (see FIGS. 1, 2 a, 2 b ) is made for instance on the yarn 2 twist retention member 1 and whose the other part is made on said first body 6 in which the yarn 2 twist retention member 1 is seated.
  • the yarn 2 twist retention means is made as a longitudinal groove 8 situated in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 .
  • the walls 80 of the longitudinal groove 8 are situated mutually symmetrical along the longitudinal symmetry plane of the bent section 50 of the bent yarn 2 delivery channel 5 and the area of their mutual contact forms the bottom 82 of the longitudinal groove 8 .
  • the longitudinal groove 8 situated in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 is shaped as the letter “V”.
  • FIG. 1 the longitudinal groove 8 situated in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 is shaped as the letter “V”.
  • each of the walls 80 of the longitudinal groove 8 made in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 is shaped as a pair of mutually inclined sections 81 .
  • the walls 80 of the longitudinal groove 8 in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 have convex-shaped profile.
  • the walls 80 of the longitudinal groove 8 in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 have concave-shaped profile.
  • the walls 80 of the longitudinal groove 8 in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 have another suitable profile, including asymmetrical profiles, for instance that of an asymmetrical letter “V”.
  • the width of the longitudinal groove 8 of the yarn 2 twist retention member 1 or the value of the angle formed between the walls 80 of the longitudinal groove 8 of the yarn 2 twist retention member 1 used in a specific case can be chosen either in accordance with the thickness of the yarn 2 to be produced or it (the width, the angle) can be the same for each of the thickness values of the yarn to be produced, or it is possible to use the embodimet shown in FIG. 2 b in which the walls 80 of the longitudinal groove 8 are broken so that one longitudinal groove 8 can serve two width values.
  • the bottom of the longitudinal groove 8 i.e., the contact section of the walls 80 of the longitudinal groove 8 , can be made either as a sharp or as a rounded transition.
  • the surface roughness of the walls 80 of the longitudinal groove 8 in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 lies between R a 16 and R a 0,1.
  • the surface roughness of the walls 80 of the longitudinal groove 8 can be either constant along the whole of the wall length or it can assume at least two different values in the length direction of the longitudinal groove 8 .
  • the surface roughness of the walls 80 of the longitudinal groove 8 in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 also can be superior to the surface roughness of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 .
  • the greater surface roughness R a of the walls 80 of the longitudinal groove 8 as compared with the the surface roughness R a of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 facilitates the introduction of the yarn free end into the spinning rotor during the spinning-in operation because it reduces the yarn friction in the bent section 50 of the bent yarn 2 delivery channel 5 during its contact with the walls of the bent yarn 2 delivery channel 5 .
  • the yarn is under the action of its delivery introduced into the longitudinal groove 8 marked by higher surface roughness R a of the walls 80 of the longitudinal groove 8 with the effect for the yarn 2 twist to be efficiently retained by the retention member 1 .
  • the surface roughness R a of the walls 80 of the longitudinal groove 8 in the part of the wall of the bent yarn 2 delivery channel 5 constituting the inner side 501 of the bent section 50 of the bent yarn 2 delivery channel 5 also can be either constant along the whole of the wall width or it can assume a different, as a rule a superior, value at the portion adjacent to the bottom 82 of the longitudinal groove 8 as compared with the portion more distant from the bottom 82 of the longitudinal groove 8 . This can be applied in analogy also to the other examples of embodiment of the longitudinal groove 8 whether or not shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US09/860,306 2000-05-26 2001-05-18 Yarn twist retention member on an open-end spinning machine Abandoned US20020020163A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZPV2000-1952 2000-05-26
CZ20001952A CZ290466B6 (cs) 2000-05-26 2000-05-26 Zadrľovač zákrutu příze na bezvřetenovém dopřádacím stroji

Publications (1)

Publication Number Publication Date
US20020020163A1 true US20020020163A1 (en) 2002-02-21

Family

ID=5470787

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/860,306 Abandoned US20020020163A1 (en) 2000-05-26 2001-05-18 Yarn twist retention member on an open-end spinning machine

Country Status (5)

Country Link
US (1) US20020020163A1 (cs)
EP (1) EP1158080B1 (cs)
CN (1) CN1265042C (cs)
CZ (1) CZ290466B6 (cs)
DE (1) DE60102412T2 (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180320292A1 (en) * 2015-11-06 2018-11-08 Maschinenfabrik Rieter Ag Thread Draw-Off Nozzle having Notches Extending Radially to the Nozzle Bore

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10329612A1 (de) * 2003-06-23 2005-01-13 Wilhelm Stahlecker Gmbh Garnabzugseinrichtung für Offenend-Spinnvorrichtungen
CN102747470B (zh) * 2012-07-12 2015-07-08 宁波双盾纺织帆布实业有限公司 阻捻头
DE102015119114A1 (de) * 2015-11-06 2017-05-11 Maschinenfabrik Rieter Ag Fadenabzugsdüse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS276522B6 (en) * 1990-02-22 1992-06-17 Elitex Cerveny Kostelec Draw-off funnel for yarn rotor spinning
GB2322385B (en) * 1997-07-02 2000-02-16 Morgan Matroc Limited Thread guiding wheels
CZ287093B6 (cs) * 1998-06-10 2000-09-13 Rieter Elitex A. S. Zadržovač zákrutu příze na bezvřetenovém dopřádacím stroji

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180320292A1 (en) * 2015-11-06 2018-11-08 Maschinenfabrik Rieter Ag Thread Draw-Off Nozzle having Notches Extending Radially to the Nozzle Bore
US10767284B2 (en) * 2015-11-06 2020-09-08 Maschinenfabrik Rieter Ag Thread draw-off nozzle having notches extending radially to the nozzle bore

Also Published As

Publication number Publication date
DE60102412D1 (de) 2004-04-29
CZ290466B6 (cs) 2002-07-17
EP1158080A1 (en) 2001-11-28
CN1327095A (zh) 2001-12-19
EP1158080B1 (en) 2004-03-24
CN1265042C (zh) 2006-07-19
DE60102412T2 (de) 2005-03-10
CZ20001952A3 (cs) 2002-04-17

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Legal Events

Date Code Title Description
AS Assignment

Owner name: RIETER ELITEX A.S., CZECH REPUBLIC

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SLEZAK, LADISLAV;TESAI, OLDRICH;JIRGES, JAROSLAV;AND OTHERS;REEL/FRAME:012201/0595

Effective date: 20010827

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION