US3734143A - Measuring and length determining means for weft yarn in shuttleless looms - Google Patents

Measuring and length determining means for weft yarn in shuttleless looms Download PDF

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Publication number
US3734143A
US3734143A US00079478A US3734143DA US3734143A US 3734143 A US3734143 A US 3734143A US 00079478 A US00079478 A US 00079478A US 3734143D A US3734143D A US 3734143DA US 3734143 A US3734143 A US 3734143A
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yarn
length
yarns
loom
measuring
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US00079478A
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English (en)
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V Svaty
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Elitex Zavody Textilniho
Elitex
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Elitex Zavody Textilniho
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D41/00—Looms not otherwise provided for, e.g. for weaving chenille yarn; Details peculiar to these looms
    • 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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet

Definitions

  • shuttleless weaving looms in which the weft yarn is thrown by a jet of high pressure air between the opened warp yarn system of a fabric shed, have become known they have many disadvantages. Such machines have limited width, low speed, poor efficiency, and little versatility. Attempts to overcome these disadvantages have been tried. For example looms with double sheds fed by one inserting device have been suggested. It was necessary however to provide this machine with gripper rods, pivotable needles, or other means to grasp the weft yarn and insert it alternatingly in the form of a loop into the opposite sheds.
  • the known looms are unsuitable for the production of weaving apparel since they require the insertion of a double weft and are not adaptable to the production of multicolor or mixed weft feeding as would be necessary for the production of such material as silk and cotton.
  • a shuttleless loom having pneumatic means for delivering yarn to a fabric shed comprising apparatus for measuring and determining the length of the yarn.
  • the apparatus comprises selectively operable withdrawing means interposed between a supply and the delivery means and selectively operable brake means located between the supply and the withdrawal means.
  • Control means are provided to sequentially operate the brake and withdrawal means for a predetermined time to pull a defined length of yarn from the supply.
  • the withdrawal means may comprise a pair of opposed rollers, however, it preferably comprises a pulley held between the ends of a cable which is held at one end by a winch and at the other by a yieldably resilient member.
  • the yarn passes over the pulley which by being reciprocally pulled withdraws a defined length of yarn from the supply.
  • FIG. 1 is a plan view, partially in section and partially schematic, showing a loom embodying the insertion device and measuring system of the present inven tion;
  • FIG. 2 is view similar to FIG. 1 showing another form of the invention
  • FIG. 3 is an enlarged sectional view showing the position of the pneumatic insertion device of the present invention with regard to the warp system and beat reed;
  • FIG. 4 is a vertical section through the insertion device of the present invention.
  • FIG. 5 is an enlarged plan view of the details of the control means for the insertion device.
  • the loom is provided with a common weft feeding and inserting device 1 located transversely between two opposed warp or shed systems.
  • the inserting device 1 is a pneumatic system which as seen in FIGS. 4 and 5 comprises a reversible nozzle assembly from which extends a pair of hollow cones 2,2 through the respective orifices 3,3 of which pass weft yarns 4,4. The yarns are fed through a central opening at the top of the nozzles assembly by means to be described later.
  • the cones 2,2 of the nozzle assembly are mounted on a carrier body 5, journalled for rotation upon a bearing 6 which is itself mounted by suitable screw fasteners to an arm 7.
  • the arm 7 extends cantilevered from and is adjustably secured to a longitudinally extending breast beam 8.
  • the arm 7 is provided with a channel 9 extending centrally to a point beneath a duct 10 which itself extends through the center of both the bearing 6 and carrier 5.
  • a transeverse bore 11 is formed within the carrier 5, beneath the cones 2, 2, which communicating with the duct 10 opens outwardly in the direction of the orifices 3,3.
  • conical funnel caps 12 and 12 Surrounding each of the cones 2 and 2 and the respective ends of the bore 11 are conical funnel caps 12 and 12 respectively adapted to condense and direct the air about the cones outwardly in a horizontal column from the orifice 3,3.
  • Air is supplied from the source to maintain a volume within the nozzle assembly, to hold the end of the yarn 4, 4 in the orifice 3,3, and at selected time supplied as an impulse jet of high pressure to force and carry the yarn outwardly into the respective sheds.
  • the supply of the picking fluid, as seen in FIG. 3, in this particular case the pressure air, to the inserting device 1 is directed by means of a feed line 53 and a compressor 54 driven by an electric motor 55, there being a valve 56 disposed in the line 53, which is controlled by a solenoid 57.
  • the solenoid 57 is connected (FIG. by means of conductors 58 with a switch 59 and a source of electric current 60.
  • a wheel gear 13 is secured about the lower end of the carrier and is engaged by a corresponding segment ratchet 14.
  • the segment ratchet 14 is fixed at the end of a lever 15 pivoted at its other end 15 on the arm 7.
  • the lever 15 is operatively positioned by the core of a solenoid control device 16 and a compression spring 17.
  • the solenoid 16 is a conventional electromagnetic device capable of retracting or permitting extension of the core 16 on the application of an electric current through the coil.
  • Solenoid 16 (FIG. 5) is connected by means of conductors 61 with another switch 62 and also with a source 63 of electric current.
  • Associated with the switches 59 and 62 are control cams 64 and 65 mounted on a common shaft, together with the cam 39.
  • a cam 66 controlling a switch 67 which by means of conductors 68 closes the electric circuit for solenoid 69 of the brakes 46, 46' according to FIG. 1, or for solenoid 37, the latter controlling the bell crank 36 which supports the feed roller 35, according to FIG. 2.
  • the source of current switch, or relay means is conventional.
  • the swing of lever 15 and consequently of ratchet 14 is limited by the stop pins 18 and 19 which are set so as to enable full movement of the ratchet 14 to rotate the nozzle assembly by 180.
  • the outer or free end 20 of the arm 7 extends over the batten 21 of the loom.
  • the batten 21 is mounted on the upper end of a lever arm or sword 22, pivoted to the frame of loom at its other end 23.
  • the batten 21 carries a divided reed 24, 24 to beat up the weft yarns 4,4 as they are laid into the fabrics sheds 25, 25 produced on the loom to either side of the weft feed assembly.
  • the reed 24,24 is adjustably mounted to the batten 21.
  • the arm 7 furthermore carries temples 26,26 for holding the selvedges of the advancing fabrics 25, 25.
  • the arm 7 is arranged symmetrically between two sheds formed from warp 27, 27 systems forming the fabrics 25, 25. In the event fabrics of uneven width are desired, it is only necessary to move the arm to the right or left a corresponding distance.
  • An elongated channel housing member 28 is mounted above the length of the breast beam 8.
  • the housing defines an inner space 29 and is covered by a lid 30.
  • the channel member 28 houses within the space 29 means for withdrawing the weft yarn 4,4 from a pair of bobbins 31, 31 mounted to the side of the loom. The yarns are simultaneously measured and fed to the nozzle assembly.
  • the yarns 4,4 pass from their respective bobbins 31,31 through a brake 32,32 such as the conventional disk brake, through a comb guide 33, to which the yarns pass disposed at relatively different levels between a pair of feed rollers 34 and 35 to the nozzle cones 2,2.
  • the feed roller 34 is fixed to a shaft, journalled in a stationary bearing and continuously rotated in the direction shown by the arrow.
  • the second feed roller 35 is freely journalled at the end of a bell crank 36, opposite to the roller 34.
  • a solenoid device 37 is located adjacent the free end of the bell crank 36 and is selectively activated by impression of an electric current (from a source not shown).
  • the core 37 is hooked into engagement with the upper free end of the bell crank 36.
  • a compression spring 38 is fixed between the lower arm of the bell crank 36 and the frame of the loom to maintain the roller 35 normally out of contact with the roller 34.
  • the solenoid 37 is energized to extend the core 37 upward in the direction of the nozzle, as seen in FIG. 2 to thereby pivot the bell crank 36 and bring the two rollers 34 and 35 into engagement.
  • the rollers draw the yarns 4,4 from the bobbins 31, 31.
  • the solenoid 37 is deenergized and the spring 38 pulls the rollers out of engagement.
  • the action of the brakes 32,32 limits the amount of weft which can be drawn through the cones 2,2 by the force of the air jet blown through the nozzles.
  • a cable 42 is wound about the drum 41 and has one end stretched to extend along the housing 29 in a direction tangential to the drum 41 and is provided at its end with a light weight ball preferably made of plastic such as a table tennis ball.
  • the ball 43 is located in an elongated tube 44 connected at its opposite end to a source of suction. By sucking through the tube 44 on the ball 43 the cable 42 is pulled taut. By varying the degree of suction on the ball 43 degree of tension on the cable 42 can be varied.
  • the yieldably resilient mechanism created by the ball 43 and 44 is highly accurate and precise. It will how ever be appreciated that other means such as a compression spring may also be used at the end of the cable.
  • a pair of eyelets or pully member 45, 45 Secured to the cable 42 are a pair of eyelets or pully member 45, 45 therethrough which the weft threads 4,4 are passed.
  • the pullies 45, 45 may be adjustably relative to each other so as to be fixed at different distances from the drum 41 or ball 43.
  • Located between the bobbins 31, 31 and the pully 45, 45 are a pair of disc brakes 46,46.
  • the brakes 46, 46 are preferably jointly controlled by a solenoid device 46 a, to exert a selective braking action or drag on the yarns 4,4.
  • a common coil and core is provided for the solenoid 46 to insure joint operation of brakes.
  • Other automatic or electromechanical braking means may be used.
  • a pair of separating roller capstans or guides 47 and 47 adapted to be vertically adjustable.
  • the electromechanical brakes 46, 46 are adapted to normally exert a drag on the yarns 4, 4 so that between the brakes and the orifices 3,3 of the nozzle assembly the yarns are held under continuous tension. The brakes are released whenever the yarns are to be unwound from their respective bobbins.
  • the guide 47 is arranged below that of the guide 47, conforming to the comb 3, since in order to prevent the weft threads 4, 4' from entanglement in their path between the guides 47, 47' and the reversibly rotatable nozzles 1, it is necessary to maintain a certain sense in the relative movements of the nozzles 1.
  • the movement of the pullies 45, 45 causes withdrawal of thread 4,4 from their respective bobbins into the housing 29 in the form of a loop of hairpin shape as seen.
  • the length of the yarn may also be controlled by the initial position of the ball 43 in the tube 44.
  • the brakes 46, 46 may be activated, and the winding drum stopped.
  • the yarns will thus be held under tension between the brakes 46, 46 and the cones 2,2 of the nozzle assembly, while the same yarns are loosely held between the bobbins 31 and 31 and the same brake means.
  • the forces on the yarn is created by the tensioning devices formed by the drum mechanism 41 acting on cable 42, on the one hand, and the ball 43 on the other hand. Variation of either device will selectively change the tension.
  • the measured yarns are laid into the shed, at instant when the reeds 24, 24 are in their most rearward, or non-beat position, and the shed formed in the warp yarns 27 is open, as seen in FIG. 3 for reception of the weft.
  • a burst of high pressure air is delivered to the nozzle 1 and the pullies 45, 45 are released (by reversal of rack 40) to move: backward under the effect of suction on the ball 43.
  • the brakes 46, 46 are held in full brake position so that the force of air impulse pulls the yarns and deposits them between the warp threads 27 of the respective sheds.
  • the weft yarn 4,4 is normally surrounded by a volume of blowing air through the funnel cap 12, 12.
  • a blast or jet of air under high pressure is impressed through the nozzle assembly and the weft length is inserted between the warp 27.
  • the yarns are beaten up by movement of the reeds to the completed end 48 of the fabric 25, 25.
  • the tread end is cut leaving it suspended in the cone 2,2.
  • Conventional cutting devices or thread burning devices 49, 49' comprising a holder and a resistance wire 50 and 50' connected by conductors 51 to a source 52 of electric current, are located between the orifices 3, 3' and the febric end 448.
  • the wires 40 and 51 burn off the weft threads 4, 4'.
  • the present apparatus has a number of advantages not found in the prior art looms. While conventional devices have been designed to insert weft under fluid pressure on looms up to to cms the weft insertion device of the present invention can be used on looms having width in excess of 3 meters which may then approach the size of contemporary gripper looms. A further advantage is obtained by the present device with regard to the efficiency of its operation. The present device can work on these wide looms at the same speed (400-500 weft insertions per minute) at which contemporary narrow jet looms operate.
  • a great advantage is obtained from the versatility of the present weaving loom and the possibility of turning the weft insertion device at the end of each weft laying in. Thus such fabrics may be easily formed. Because the turning of the nozzle assembly can be selectively accomplished predetermined weft patterns of perhaps multiple (e.g. 10 or 12) weft insertions of particular thread may be accomplished. It is not necessary to turn the assembly after each weft lay in. Two color goods may also be easily formed since the present device eliminates the need of handling waiting weft bobbins and gripper means by the simple expedient of reversing the nozzle assembly.
  • the present device also permits the formation of fabrics of unequal width. By repositioning the arm 7 along the breast beam 8 as previously explained and by adjustably varying the relative distances between the pullies 45 and 45 for example weft yarns of different length can be obtained.
  • a shuttleless loom comprising at least one warp shed forming system and a hollow breast beam extending along the length of said loom, pneumatic means for delivering yarn for the weft thereof, a supply of yarn, and means for measuring and feeding a determined length of yarn to said pneumatic means, said means for measuring said length of yarn being located in said beam, and comprising means for selectively pulling a length of yarn into said beam and brake means for holding said yarn from being pulled during feeding of said length to said pneumatic means.
  • apparatus for measuring and determining the length of the yarns fed to said delivery means, comprising selectively operable means interposed between said supply and said pneumatic means, for withdrawing said yarn from said supply, said withdrawing means comprising a pulley mounted between opposed tensioning devices, and includes means for causing said tension devices to exert selectively operating forces on said pulley means to withdraw the yarn from the supply, selectively operable brake means located between said supply and said withdrawing means, and control means for sequentially operating said brake and withdrawing means for predetermined periods to obtain a determined length of yarn.
  • said means for oscillating said winch comprises a circular gear connected to said winch, a rack engaging said gear, said rack having a cam follower at one end and a cam engaging said cam follower to cause said rack to reciprocate in a predetermined manner to cause said winch to rotate in periodic reversing directions.
  • said yieldably resilient means comprises an elongated tube, a source of vacuum applying a suction to said tube, and wherein said cable is provided with a ball adapted to be inserted within said tube and subject to said suction force.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
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US00079478A 1969-10-10 1970-10-09 Measuring and length determining means for weft yarn in shuttleless looms Expired - Lifetime US3734143A (en)

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DE (1) DE2049373A1 (ja)
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GB (1) GB1322519A (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853153A (en) * 1972-06-30 1974-12-10 Rueti Te Strake Bv Device for intermittently supplying measured weft yarn lengths to the weft inserting device of a shuttleless weaving machine
US5904186A (en) * 1995-06-02 1999-05-18 Sulzer Rueti Ag Series shed weaving machine for weaving multiple web panels on a single rotor
US20080216912A1 (en) * 2005-01-21 2008-09-11 Picanol N.V. Device for the Picking of Weft Threads in an Air Jet Weaving Machine
US20080271807A1 (en) * 2006-09-07 2008-11-06 Sultex Ag Method and a stretching device for the holding of a weft thread
US20090272456A1 (en) * 2005-10-05 2009-11-05 Francisco Speich Weaving Machine Comprising Pneumatic Weft Insertion

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH620715A5 (en) * 1977-05-12 1980-12-15 Sulzer Ag Weaving machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853153A (en) * 1972-06-30 1974-12-10 Rueti Te Strake Bv Device for intermittently supplying measured weft yarn lengths to the weft inserting device of a shuttleless weaving machine
US5904186A (en) * 1995-06-02 1999-05-18 Sulzer Rueti Ag Series shed weaving machine for weaving multiple web panels on a single rotor
US20080216912A1 (en) * 2005-01-21 2008-09-11 Picanol N.V. Device for the Picking of Weft Threads in an Air Jet Weaving Machine
US7726351B2 (en) * 2005-01-21 2010-06-01 Picanol N.V. Device for the picking of weft threads in an air jet weaving machine
US20090272456A1 (en) * 2005-10-05 2009-11-05 Francisco Speich Weaving Machine Comprising Pneumatic Weft Insertion
US20080271807A1 (en) * 2006-09-07 2008-11-06 Sultex Ag Method and a stretching device for the holding of a weft thread

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FR2064236A1 (ja) 1971-07-16
FR2064236B1 (ja) 1979-03-26
GB1322519A (en) 1973-07-04
DE2049373A1 (de) 1972-03-16

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