US3841358A - Apparatus for forming leno selvedge - Google Patents

Apparatus for forming leno selvedge Download PDF

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Publication number
US3841358A
US3841358A US00286860A US28686072A US3841358A US 3841358 A US3841358 A US 3841358A US 00286860 A US00286860 A US 00286860A US 28686072 A US28686072 A US 28686072A US 3841358 A US3841358 A US 3841358A
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Prior art keywords
carrier
warp
heald
thread
sleeve
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Expired - Lifetime
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US00286860A
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English (en)
Inventor
V Svaty
L Taticek
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Elitex Zavody Textilniho
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Elitex Zavody Textilniho
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C7/00—Leno or similar shedding mechanisms

Definitions

  • the present invention relates to a method of and an apparatus for forming leno weaves in fabrics, particularly in forming leno weaves on shuttleless weaving machines, employing warp threads and additional or added threads.
  • tilting entwiners by which either the added leno threads or the warp threads are mutually overcrossed have also been used.
  • These machines comprise a system of needles arranged on the heddle shafts to create a so called false twist. This equipment is moved by auxilliary mechanisms and is relatively easily displaceable on the machine.
  • the leno weave formed thereby generally has low strength, and the leno threads have a low degree-of cohesion with the individual ends of the weft threads.
  • Another object of the present invention is to provide a method of forming leno weaves which exhibit good adhesion to the woven threads and good physical properties.
  • the method of forming fabrics having leno weaves from warp threads and additional or added threads is provided.
  • the method comprises the steps of forming a shed of at least a warp thread and supplying thereto an additional or added thread in association with the warp thread. Simultaneously, with the supply of the added thread there is imparted a relative circular motion to the associated warp and added threads, which continues during the formation of the shed in order to entwine the warp and additive thread about each other.
  • the source of the added thread is contained on a movable carrier located adjacent the formation of the shed and is moved in the up and down reciprocating movement of the warp healds while the warp thread moves in a closed circular path about it.
  • loom apparatus for forming fabrics with leno weaves from warp threads and added threads.
  • the loom has a plurality of heald shafts and heddles arranged in cooperative relationships.
  • the heald shafts are capable of movement in a conventional manner in opposite reverse directions to form a shed.
  • One pair of heald shafts are arranged one behind the other and are provided with heddles each of which have an eyelet through which the warp thread is passed.
  • a carrier for an additional or added thread is located on one of said heald shafts in a position corresponding to the eyelets of the heddles, of the other shaft in the associated pair.
  • Means are provided for circularly moving the carrier and the heddle through which the warp thread is fed relative to each other, to cause the warp and added thread to entwine about each other.
  • the added thread carrier comprises a floating sleeve secured between a pair of stretched flexible tapes, and the warp thread is passed through a tubular guide.
  • the guide is adapted to be moved between the surface of the carrier and the tapes in a circular path.
  • the carrier is supported between a pair of magnets which shuttle the carrier in a reciprocating movement while the warp thread slides about the carrier.
  • the carrier and its associated supports are mounted on the healds of the warp system of the first of a pair forming the shed and the warp passes from the rear heddles through the supports.
  • FIG. 1 illustrates the present invention in which a carrier for a supplyof additional or added thread, in the form of a floating sleeve is located between two oppositely mounted heald rods of one heald shaft with a diagrammatic representation of the arrangement of a tubular guide for the warp thread which is fastened on the heald rod of the following heddle shaft;
  • FIG. 2 shows a front view of the device seen in FIG.
  • FIG. 3 shows a lateral view of another embodiment of the invention in which the carrier is disposed between the poles of a plurality of electromagnets fastened on the heald rods of the heald shaft;
  • FIG. 4 is a front view of the device seen in FIG. 3; a simplified electric control circuit-therefor;
  • FIG. is a longitudinal sectional view through the carrier and showing the position of the supply of additional thread and a magnetic braking ring in the bobbin of the supply;
  • FIG. 6 is an isometric sketch showing the weaving system.
  • FIG. 1 and FIG. 2 there is illustrated therein an embodiment of the apparatus in accordance with the present invention, comprising an elongated carrier for additional or added thread in the form of a floating sleeve 1 movably secured by suitable means such as at least two gripping stretched straps or tapes 2 between two oppositely disposed heald rods 3 of the conventional heald shaft 4.
  • a thread guide 6 having an eyelet 5 is fixedlymounted on the sleeve 1, and located at such a position that the center of the sleeve and the eyelet 5 of the guide 6 corresponds to the position or horizontal level of the eyelets 7 of the neighboring heddle wires 8 fixed on the heddles 9 of the same heald shaft 4.
  • the heald rods 3 are provided with a longitudinal, key groove 10 which receives the conforming ends of a clamping means A holding the sleeve 1.
  • the gripping tapes 2 are made of suitable elastic and- /or flexible material such as plastic, rubber, leather, etc. and are resiliently suspended, so that they may be distended by the up and down movement of the carrier 1 which floats between the tapes 2.
  • the entire assembly of tapes and carrier sleeves l are movable and displaceable in grooves 10 along the entire length of heald shaft 4 according to the width of the fabric 11 to be woven.
  • the floating carrier sleeve 1 is secured between the gripping tapes 2 so that they are firmly seated but can be slid. relatively to it and be separable from it. This can be accomplished by providing the floating sleeve 1, for example, on its outer frontal surface with a shallow longitudinal groove 12 which corresponds in depth and width to the size of the gripping tapes 2. This provides a longitudinal key way in which the tapes fit and are permitted vertical movement but not lateral movement.
  • the two ends of the floating sleeve 1 are provided with parallel contact surfaces 13 extending in an oblique direction to its frontal surfaces. As seen in FIG. 5, the floating sleeve 1 is hollow and at least open on one side.
  • a supply means such as a metal bobbin 14 having a winding 15 on which the additional or added thread 16 is wound, is mounted within the hollow space.
  • the bobbin 14 is supported on a pin 17 by a magnetic ring 18, which constitutes the braking means for the bobbin.
  • the magnetic ring exerts a drag on the bobbin preventing the thread from being pulled off beyond the length needed, thus preventing its unravelling, and keeping the thread under proper tension.
  • a tubular guide 19 carrying a warp thread extends between the tapes 2 beneath the floating sleeve 1 toward the forming shed and forming fabric.
  • the guide 19 is supported by means of a resilient carrier beam 20 disposed on one of the heald rods 21 of the following or next succeeding heald shaft 22 of the weaving machine.
  • the tubular guide 19 penetrates the space between the g'ripping tapes 2 and the lower oblique surface of the floating sleeve 1 when the apparatus is at rest position.
  • a warp thread 23 is guided through the tubular guide 19 and is normally withdrawn from a warp beam or from a stationary supply (neither of which are shown) mounted on the weaving machine.
  • Suitable means for synchronizing the movement of the associated healds, etc. to provide the shed formation of threads, and the operation of the floating carrier sleeve is provided by the use of conventional apparatus, which is not shown here. It will be seen that only a pair of heald shafts 4 and 22 are shown. The apparatus can be arranged with pluralities of pairs of heald shafts, dependent upon the number of warps in the shed formation.
  • FIGS. 1 and 2 operates as follows:
  • the adjacent separate heald shafts 4 and 22, arranged behind each other, are given the usual opposite motion, whereby the warp threads, controlled by them, form a weaving shed in the known manner.
  • the floating carrier sleeve 1 carried in tapes 2 moves up and down carrying the additional or added thread 16 with it.
  • the tubular guide 19 which is fastened on the other heald shaft 22 moves oppositely thereto in a shifted phase relative to each other.
  • the guide moves upwards from the position as shown in FIG. 2, while the floating sleeve 1 sinks. This movement proceeds until the guide 19 contacts lower oblique contact surface 13 of the sleeve 1.
  • the guide 19 slides over the angular contact surface 13 between the frontal surface of the sleeve 1 and the gripping tape 2, thus deflecting and spreading the gripping tape 2 apart so that the tubular guide 19 can slide further upward in the advancing slot that is thus formed.
  • the guide 19 moves along the frontal face of the sleeve 1 until it reaches the opposite end 13 of the carrier sleeve 1.
  • the additional or added thread 16 is withdrawn from bobbin 14 located inside floating carrier sleeve 1 and entwined in a pure twist by the warp thread 23.
  • the ends of woven in weft threads 24 are gripped by the separate turns of those additional or added theads and warp threads, thus reinforcing the selvedges of the fabric 11.
  • FIGS. 3 and 4 Ahother embodiment is shown in FIGS. 3 and 4 in which the sleeve 1 may be mounted freely between a pair of electromagnetic supports rather than between the flexible tapes.
  • at least one or more sleeves 1 are arranged side to side between pole shoes 25, of each of electromagnets 26, 26'.
  • the poles of the magnets 26 and 26' at one end of the carrier 1 are directed always at the oblique surface of the carrier and one frontal face respectively, while those poles at the opposite end are directed in reverse manner at the oblique surface and the other frontal surface respectively.
  • the electromagnets 26 and 26 are provided with supply circuits designated by numeral 27 connected to a suitable source of power 28 such as the line source and with one or more switches such as those designated at 29 driven by a cam mechanism 30.
  • Cam mechanism is linked through conventional means from a main shaft of the weaving machine in order to accomplish synchronous switching of the individual electromagnets 26 and 26 with the shedding rhythm of the weaving machine.
  • the warp thread 23 can be held stationary and the floating sleeve 1 can be moved around it while carrying the-additional or added thread 16.
  • the particular arrangement and operation employed depends on the type of weaving machine to be used.
  • the modification of the design of the supports for the various means such as the floating carrier sleeve, guide means and other elements may take many forms.
  • Loom apparatus for forming selvedges with leno weaves from warp threads and added threads, said loom having a plurality of heald shafts, said heald shafts being capable of movement in opposite reverse directions to form a shed, at least one pair of heald shafts in which one shaft is located behind the other, a plurality of heddles located on each of said heald shafts, each of said heddles having an eyelet through which a warp thread is fed, a carrier located on one of said heald shafts in position corresponding to an eyelet of a certain of said heddles of the other shaft, supply means located on said carrier for supplying added thread and means for circularly moving the carrier and the heddle through which said warp thread is fed relative to each other to entwine said warp and said added thread about each other.
  • the carrier comprises a sleeve moveably secured between a pair of tapes fastened at each end on oppositely mounted heald rods of said one heald shaft and said other heald shaft is provided at said eyelet with a tubular guide through which said warp is fed, said tubular guide extending into contact with the surface of said sleeve.
  • Apparatus according to claim 3 wherein an adjacent pair of heald shafts are each provided with a carrier mounted between said pole shoes of an electro magnet.
  • the carrier is mounted between a plurality of electromagnets located in said heald shaft, and includes means for alternatingly activating said magnets in synchronism with the shedding rhythm to attract said carrier in a re- 8.
  • the carrier is a metal bobbin provided ,with a magnetic braking ring for braking the same.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US00286860A 1971-09-10 1972-09-07 Apparatus for forming leno selvedge Expired - Lifetime US3841358A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS647271A CS157896B1 (enrdf_load_stackoverflow) 1971-09-10 1971-09-10

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US3841358A true US3841358A (en) 1974-10-15

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US00286860A Expired - Lifetime US3841358A (en) 1971-09-10 1972-09-07 Apparatus for forming leno selvedge

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US (1) US3841358A (enrdf_load_stackoverflow)
JP (1) JPS4836454A (enrdf_load_stackoverflow)
CH (1) CH550270A (enrdf_load_stackoverflow)
CS (1) CS157896B1 (enrdf_load_stackoverflow)
DE (1) DE2242817A1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5988228A (en) * 1996-12-12 1999-11-23 Lindauer Dornier Gesellschaft Mbh Leno selvage former for a weaving loom
US6076250A (en) * 1996-01-13 2000-06-20 Firma Schmeing Gmbh & Co. Process for producing a heald shaft for weaving shafts out of a metal hollow section
US20130160890A1 (en) * 2011-06-30 2013-06-27 Gebruder Klöcker Gmbh Device to form a leno selvedge
US20150246655A1 (en) * 2012-09-27 2015-09-03 Toray Industries, Inc. Woven fabric and process of producing same
US20170107648A1 (en) * 2014-06-13 2017-04-20 Picanol Selvedge forming device for a weft thread
US11560649B2 (en) * 2018-03-01 2023-01-24 James Dewhurst Limited Woven textile and associated method of manufacture

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1515595A (en) * 1924-11-18 friend
FR1063823A (fr) * 1952-04-29 1954-05-07 Appareil de tissage pour la fabrication des tissus gaze et de ses dérivés, et pour l'obtention du point de feston par tissage
US3698441A (en) * 1970-06-19 1972-10-17 Strake Maschf Nv Device for forming a selvage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1515595A (en) * 1924-11-18 friend
FR1063823A (fr) * 1952-04-29 1954-05-07 Appareil de tissage pour la fabrication des tissus gaze et de ses dérivés, et pour l'obtention du point de feston par tissage
US3698441A (en) * 1970-06-19 1972-10-17 Strake Maschf Nv Device for forming a selvage

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6076250A (en) * 1996-01-13 2000-06-20 Firma Schmeing Gmbh & Co. Process for producing a heald shaft for weaving shafts out of a metal hollow section
US5988228A (en) * 1996-12-12 1999-11-23 Lindauer Dornier Gesellschaft Mbh Leno selvage former for a weaving loom
US20130160890A1 (en) * 2011-06-30 2013-06-27 Gebruder Klöcker Gmbh Device to form a leno selvedge
US8590578B2 (en) * 2011-06-30 2013-11-26 Gebruder Klocker Gmbh Device to form a leno selvedge
US20150246655A1 (en) * 2012-09-27 2015-09-03 Toray Industries, Inc. Woven fabric and process of producing same
US9211865B2 (en) * 2012-09-27 2015-12-15 Toray Industries, Inc. Woven fabric and process of producing same
US20170107648A1 (en) * 2014-06-13 2017-04-20 Picanol Selvedge forming device for a weft thread
US9915015B2 (en) * 2014-06-13 2018-03-13 Picanol Selvedge forming device for a weft thread
US11560649B2 (en) * 2018-03-01 2023-01-24 James Dewhurst Limited Woven textile and associated method of manufacture

Also Published As

Publication number Publication date
CS157896B1 (enrdf_load_stackoverflow) 1974-10-15
CH550270A (de) 1974-06-14
JPS4836454A (enrdf_load_stackoverflow) 1973-05-29
DE2242817A1 (de) 1973-12-13

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