US3537487A - Looms operating with a jacquard - Google Patents

Looms operating with a jacquard Download PDF

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Publication number
US3537487A
US3537487A US750275A US3537487DA US3537487A US 3537487 A US3537487 A US 3537487A US 750275 A US750275 A US 750275A US 3537487D A US3537487D A US 3537487DA US 3537487 A US3537487 A US 3537487A
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United States
Prior art keywords
cord
mass
loom
resilient
eyelet
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Expired - Lifetime
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US750275A
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English (en)
Inventor
Gabriel Servillat
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MECANIQUES VERDOL SOC
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MECANIQUES VERDOL SOC
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types
    • D03C3/40—Constructions of lifting-cords

Definitions

  • the mass of plastics may be obtained by means of 59, 93 sheath of a thermoplastic material disposed around the end of the cord and the lower end of the heald (or the upper end of a References Cited retaining hook), this sheath being treated by a solvent.
  • the UNITED STATES PATENTS subsequent evaporation of the solvent causes a strong contrac- .3 364 953 1/1968 s ill 139/90 tion of the sheath transformed into a tubular mass ofplastics.
  • helicoidal springs In high-speed looms the lingos are often replaced by helicoidal springs, the reaction of which is not limited by g. But conventional helicoidal springs disposed in the lower part of a loom retain the fibrous dust which falls from the latter together with the oil or grease particles escaping from the moving parts under the action of vibrations. Their successive coils are rapidly covered with an oily fibrous layer of increas' ing thickness which constitutes an intermediate abutment preventing the springs from fully returning to their normal positions of rest. When this occurs, the healds are no more returned downwardly to their lowermost position and the springs must be thoroughly cleaned in order to restore correct operation of the loom.
  • the invention is based on the discovery that the breakages which occur where a resilient cord is attached either to the lower eyelet of a heald or to a hook of the lower spring frame of a loom, are a consequence of the wear or erosion caused by repeated friction of the resilient cord against the lower part of the eyelet or against the upper portion ofthe hook.
  • the said cord In order to attach the cord to the eyelet or to the hook, the said cord must be passed through the eyelet or hook and returned or folded on itself so as to form a loop which must be fixed by a knot or by means of a binding thread. In both cases the successive tensionings and.
  • detensionings determine a slight displacement or creeping of the constitutive material of the cord on the metallic surface of the eyelet or hook either longitudinally or transversely, and this relative displacement entails frictional phenomena and a progressive erosion of the aforesaid material by the metal of the eyelet or hook. This problem of friction must therefore be solved if it desired to eliminate ruptures of resilient cords used for biassing the healds in a loom.
  • the said end of the resilient cord is enclosed in a mass of plastics under such a pressure that it cannot slide under the action of the tractive forces to which it is submitted in normal operation of the loom, the said mass of plastics being in turn secured to the lower end of the said heald, or to the upper end of the said hook.
  • FIG. 1 illustrates the lower end of a heald with its eyelet through which a rubber cord has been passed.
  • FIG. 2 shows the parts with a sleeve of thermoplastic material disposed around the eyelet and the folded end of the rubber cord, this sleeve being shown in section.
  • FIG. 3 shows the parts after contraction of the thermoplastic sleeve. 7
  • FIG. 4 illustrates a modification wherein the rubber cord is under endless form.
  • FIG. 5 shows how the cord may be secured to a hook of the lower spring frame of the loom.
  • FIG. 6 illustraterates in section an embodiment wherein the mass of thermoplastic material which connects the upper end of the cord with the lower end of the heald is obtained by a moulding operation.
  • FIG. 7 shows a modification in which the lower end of the heald is removable from the moulded mass of thermoplastic material.
  • reference numeral 1 designates the metallicwire which constitutes a heald. This wire is doubled and twisted on itself in the usual manner in order to form a central eyelet (not shown) for passage of a warp thread, and two end eyelets, the lower one being illustrated at 2.
  • a resilient-cord 3 as for instance of rubber, has been passed through the lower eyelet 2 and has been folded on itself at about 180". It is obvious that if the folded end of cord 3 is properly retained, the said cord will operate as a biassing spring of quite limited horizontal cross-sectional area and having no intermediate space where dust may collect. But, as above indicated, all attempts to use such cords in high-speed looms have met with a failure owing to the progressive erosion of the cords bythe metallic eyelets.
  • connection between the lower eyelet 2 of the heald and the upper end of the resilient cord 3 is effected by means of a tubular mass of thermoplastic material which surrounds tightly both the eyelet and the folded end of the cord.
  • This mass may be obtained by dispos ing around the parts a short sleeve 4 (FIG. 2) of an appropriate thermoplastic material (as for instance cut from a tubular braid of thermoplastic), then by impregnating this sleeve by a solvent such as acetone or chloroform, and by letting the solvent evaporate.
  • a solvent such as acetone or chloroform
  • the pressure exerted by the thermoplastic material on the cord end is such that in the compressed zone of the latter the cross-sectional area is reduced to a lower value than i that which may result from the highest tractive force applied to the cord in normal operation.
  • cord 3 when cord 3 will be tensioned in operation in the loom, its diameter will decrease, but it will never become smaller than the diameter in the zone maintained under compression by the annular mass 4.
  • FIG. 4 discloses a modification wherein the resilient cord 3 is doubled on itself under endless form.
  • a tubular mass 4 in which the ends to be connected (eyelet 2 and cor responding terminal loop of cord 3) are wholly embedded while being pressed so tightly that any relative displaccment'is quite impossible.
  • the invention may also be applied with advantage to the connection between the resilient cord and the lower frame member, or spring frame, normally provided in high-speed looms for the coil springs used as biassing means for the healds.
  • This spring frame is generally. formed of a number of crossbars (FIG. 5) on which a number of hooks 6 are threaded, each comprising a lower annular portion through which a crossbar 5 is passed, and an upper portion which forms the hook proper.
  • FIG. 5 the annular thermoplastic mass 7 in which the upper end of hook 6 and the lower end of cord 3 are embedded has been obtained as explained with reference to FIGS.
  • thelower eyelet 2 of the heald and the upper loop of the resilient cord 3, here under endless form, are connected with each other by a mass 8 of plastics which is moulded in position, as for instance by means of a small mould in which the upper end of the cord and the lower end of the heald are appropriately disposed and retained in position, the moulding material being thereafter injected into the mould under pressure.
  • the cord does not pass through the eyelet 0f the heald, which eliminates any possibility oferosion.
  • the injection pressure may be sufficiently high to compress the resilient cord to such an extent that it cannot slide in normal operation as above explained.
  • the embodiment of FIG. 6 may also be applied with a nondoubled cord, i.e. with a cord only having a terminal open loop, as in the case of FIG. 1.
  • FIG. 6 may also be used for the connection between the lower end of the resilient cord and the corresponding book of the spring frame.
  • FIG. 7 illustrates an embodiment wherein the mass of plastics, here referenced 9, has a bifurcated upper portion with two branches 9a, 9b, the lower eyelet 2 of the heald being disposed in the slit-like intermediate space.
  • Branch 9a carries a button 10 adapted to snap into a corresponding orifice of branch 9b.
  • the connection finally obtained is similar to the connection illustrated in FIG. 6 concerning the resilient cord 3 which is tightly retained in the plastics mass, but the heald may be separated from the cord, if required. It will be noted that if the button 10 is made as a separate metallic part, it cannot damage the resilient cord from which it remains spaced.
  • each of said henlds being binssed downwardly by a resilient cord having an upper end portion and a lower end portion, said resilient cord being interposed between a first element formed of the lower end of said each heald and a second element formed ofthe upper end of a hook retained by a stationary frame of said loom, the improvement comprising a mass of plastic material attached to one of said elements, said mass enclosing one end portion of said resilient cord, with said one end portion being maintained by said mass in a state in which the cross-sectional area of said cord in said one end-portion is reduced to a greater extent that it may be under the effect of the highest tension to which said cord may be submitted during operation ofsaid loom.
  • said one of said elements being annular, and said one end portion of said resilient cord being passed through said one of said elements and being folded on itself at substantially It'll) within said mass of plastic material.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Stringed Musical Instruments (AREA)
US750275A 1967-08-04 1968-08-05 Looms operating with a jacquard Expired - Lifetime US3537487A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR69049018 1967-08-04

Publications (1)

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US3537487A true US3537487A (en) 1970-11-03

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ID=9694794

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US750275A Expired - Lifetime US3537487A (en) 1967-08-04 1968-08-05 Looms operating with a jacquard

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US (1) US3537487A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE731014A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1558308A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1208486A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834426A (en) * 1971-12-02 1974-09-10 Staeubli Ag Method and apparatus for connecting the one ends of heddles or rather spring tie-rods to elastic draw cords in a jacquard machine
JPS5455949U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1977-09-13 1979-04-18

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834426A (en) * 1971-12-02 1974-09-10 Staeubli Ag Method and apparatus for connecting the one ends of heddles or rather spring tie-rods to elastic draw cords in a jacquard machine
JPS5455949U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1977-09-13 1979-04-18

Also Published As

Publication number Publication date
BE731014A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-09-15
FR1558308A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-02-28
GB1208486A (en) 1970-10-14
DE1785025A1 (de) 1971-06-09

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