EP3037575B1 - Insertion system of the weft threads in a weaving loom - Google Patents

Insertion system of the weft threads in a weaving loom Download PDF

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Publication number
EP3037575B1
EP3037575B1 EP15201580.6A EP15201580A EP3037575B1 EP 3037575 B1 EP3037575 B1 EP 3037575B1 EP 15201580 A EP15201580 A EP 15201580A EP 3037575 B1 EP3037575 B1 EP 3037575B1
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EP
European Patent Office
Prior art keywords
rack
projectiles
motors
weft thread
projectile
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EP15201580.6A
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German (de)
English (en)
French (fr)
Other versions
EP3037575A3 (en
EP3037575A2 (en
Inventor
Massimo Arrigoni
Dario Pezzoni
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Itema SpA
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Itema SpA
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Publication of EP3037575A3 publication Critical patent/EP3037575A3/en
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/24—Mechanisms for inserting shuttle in shed
    • D03D49/26—Picking mechanisms, e.g. for propelling gripper shuttles or dummy shuttles
    • D03D49/28—Driving mechanisms for the picker stick
    • 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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/24—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick by gripper or dummy shuttle
    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/275—Drive mechanisms

Definitions

  • the present invention relates to an insertion system of the weft threads in a projectile-type weaving loom and in particular to a projectile-launching device.
  • projectile weaving looms differ from the other types of weaving looms due to the fact that the weft threads are inserted into the shed through a projectile, that is, a tapered metal body of suitable mass and shape, to which - before performing the launch, and hence to a stationary projectile - the end of the weft thread is fastened.
  • a projectile that is, a tapered metal body of suitable mass and shape
  • the projectile At the shed exit (usually in correspondence of the right hand side of the weaving loom, with reference to the weaver's position) the projectile is slowed down and halted by a braking device, the weft thread is unfastened and hence the projectile is caused to return towards the launch side of the weaving loom (usually the left hand side) through a suitable continuous transport system.
  • the single in-coming projectiles are loaded onto a device which progressively brings them in front of the launchings station where they are again fastened to a desired weft thread and launched again into the shed.
  • GB 2,003,198 discloses a conventional launching device wherein a launch member, meant to abut strongly on the rear end of the projectile, is supported on a lever controlled by a torsion bar cyclically loaded through a cam mechanism.
  • cam-loaded torsion bar system represents a rather critical mechanical component, both in terms of the stresses undergone and imparted, and in terms of the opportunity to determine and control the law of motion of the projectile in the launching step.
  • Such device comprises a toothed wheel meshed in corresponding holes formed along the insertion tape - which tape is flexible to allow a sufficiently wide winding arc on the toothed wheel - the toothed wheel being controlled in alternate rotation by the main movement of the loom through a double desmodromic cam connected to an articulated quadrilateral consisting of rocking arm, connecting rod and toothed sector coupled with a pinion which is integral with and concentric to the toothed wheel.
  • the tape is progressively slowed down and caused to go back in, while the projectile continues the travel thereof by inertia, completing the insertion of the weft in the traditional way in use in projectile weaving looms.
  • patent '573 allows, at least from a theoretical point of view, to overcome the above-described drawbacks of projectile weaving looms with torsion-bar launching device.
  • the acceleration induced by such launching device is much more gradual than that of the conventional twisting-bar device and, moreover, the projectile is constantly led by the tape as far as inside a first shed portion and thus acquires a much more stable trajectory than that of the known launching system.
  • the present invention hence lies in the same technical sector which has been described in connection with patent '573, with the object of providing a weft insertion system in a projectile weaving loom which is devoid of the problems highlighted by the known above-illustrated solution as regards the opportunity of reaching a weft insertion speed which is competitive with the known-type weaving looms currently on the market.
  • the projectile insertion member 1 consists of a rack R driven into motion by a plurality of toothed wheels D, arranged in succession along the development of rack R and meshed therewith, each of wheels D being driven by a respective electric servomotor M, for example of the brushless, electronic-control type.
  • Rack R has a rectilinear layout and has a rigidity sufficient to transmit to projectiles 1 the thrust impressed by wheels D without undergoing significant deformations.
  • motors M and the arrangement thereof along rack R may be varied at will depending on the overall desired power, on the maximum power which can be effectively released by a single motor onto the teeth of wheels D simultaneously engaged with corresponding cavities of rack R and, furthermore, on the space available beside the loom.
  • motors M can be arranged aligned on one side only of rack R and below it, as illustrated in fig. 1 , or on both sides or rack R in an alternate or opposite arrangement, or else both above and below rack R in a mutually offset arrangement so as to optimise space use and to reduce the necessary length of rack R, the number of cavities of the same in simultaneous engagement with wheels D being the same.
  • motors M Due to the fact that the power necessary to obtain the desired acceleration of rack R has been divided onto multiple electric motors M, it is possible to use motors M having a very modest rotor size, and hence having each a very low rotation inertia. Motors M having this low inertia hence allow to achieve extremely low motion inversion times and, accordingly, to perform a high number of cycles of weft insertions in the loom.
  • the electronic control of motors M is performed differently between one of motors M which is considered the main motor, and the remaining motors M which are considered motors enslaved to the main motor.
  • said electronic control is performed by controlling the main motor in position, so as to obtain the desired motion curve of rack R within a weft insertion cycle.
  • the torque developed by the main motor as a consequence of such law of motion is read and instantly "copied" onto the remaining enslaved motors, which hence all work with the same torque as the main motor.
  • Fig. 2 shows a weft insertion system on the whole which comprises, in addition to the above-described launching device, and in a way known per se, a weft feeder F which feeds weft W to a weft selector P which displaces the weft of interest onto the launch path of a projectile 1 thrust by rack R.
  • Weft W is fastened in flight by projectile 1 according to the ways already known for the carrying gripper of gripper looms and hence projectile 1 is launched in the shed along guides G by the action of rack R.
  • rack R begins the deceleration, halt and return-to-the-starting-position phase, while the projectile proceeds due to its inertia as far as the exit side of the loom where it goes through a gripper-opening device 2 which releases weft W and a projectile braking device 3.
  • the projectile hence enters a suitable housing of an unloading device 4 - of which, for greater clarity, a front view is also given, in the lower part of fig. 2 - provided with two opposite housings in the illustrated embodiment, actuated by a motor 5 which provides to cause unloading device 4 to rotate by 180° on an axis parallel to the projectile trajectory, bringing the projectile in correspondence of a projectile return device.
  • Such return device - fully similar to the launching one, but provided with a single motor M R and respective toothed wheel D R which actuates a rack R R - provides to cause projectiles 1 to return, launching them along a return track 6 at reduced speed with respect to the forward speed, as far as the launch side of the loom.
  • Projectiles 1 are halted here by a braking device 7 and brought into the chosen drawing position by a cursor moving-back device 8, which causes projectiles 1 to move back up to the working area of a loading device 9.
  • Loading device 9 and the relative actuation motor 10 have a layout, operation and graphic representation fully similar to the ones described above for unloading device 4, with the only difference that the number of housings for the projectiles 1 of loading device 9 is twofold compared to that of unloading device 4 (in the embodiment illustrated there are hence four housings offset by 90°). Said layout allows to receive in loading device 9 up to 4 projectiles, since the time employed by the projectiles to travel the return track is about twice that employed in the forward phase and hence more than one projectile can be simultaneously in transit along return track 6. As a result, in case of machine halt, loading device 9 must be able to house all the projectiles already sent into the return track.
  • a preferred operation cycle of the weft insertion system expressed in angular coordinates for a weft insertion cycle (360°), is illustrated in fig. 3 and provides the following characteristic phases: 0° - projectile acceleration start 60° - weft cut 65° - rack entry into the shed and deceleration start 115° - rack return start - projectile in flight 300° - projectile arrival and rack repositioning 360° - projectile braking and insertion into the unloading device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP15201580.6A 2014-12-22 2015-12-21 Insertion system of the weft threads in a weaving loom Active EP3037575B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20142201 2014-12-22

Publications (3)

Publication Number Publication Date
EP3037575A2 EP3037575A2 (en) 2016-06-29
EP3037575A3 EP3037575A3 (en) 2016-11-30
EP3037575B1 true EP3037575B1 (en) 2018-04-25

Family

ID=52574290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15201580.6A Active EP3037575B1 (en) 2014-12-22 2015-12-21 Insertion system of the weft threads in a weaving loom

Country Status (5)

Country Link
EP (1) EP3037575B1 (zh)
JP (1) JP6708405B2 (zh)
CN (1) CN105714453B (zh)
HK (1) HK1225421B (zh)
TR (1) TR201810500T4 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105951280B (zh) * 2016-07-07 2018-04-13 安徽省兰飞化纤织造有限公司 一种织造筛网的片梭织机
IT201700080746A1 (it) * 2017-07-17 2019-01-17 Itema Spa Dispositivo di frenatura controllata di proiettili in un telaio tessile a proiettile
CN111088580B (zh) * 2019-12-16 2021-11-23 东台市金华皮件厂 一种引纬装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB368451A (en) * 1931-01-08 1932-03-10 Hutchinson Hollingworth & Comp Improvements in or relating to looms for weaving tufted pile fabrics
US2072159A (en) * 1932-06-03 1937-03-02 Dewas Raymond Weaving loom for continuous weaving in which the weft is inserted by means of pirnless shuttles
JPS5124610B2 (zh) * 1971-10-12 1976-07-26
CS209426B2 (en) * 1975-03-10 1981-12-31 Albatex Ag Facility for the control of needle motion for loading the weft on the weaving machines
CH622836A5 (zh) 1977-08-24 1981-04-30 Sulzer Ag
DE4212536C1 (zh) * 1992-04-15 1993-04-15 Lindauer Dornier Gmbh, 8990 Lindau, De
JPH0665838A (ja) * 1992-08-20 1994-03-08 San M Shokai:Kk レピア織機におけるキャリヤバンドの駆動装置
ITMI20040862A1 (it) * 2004-04-29 2004-07-29 Promatech Spa Dispositivo perfezionato per l'inserzione della trama in un telaio a proiettile e telaio a proiettile dotato di tale dispositivo
ITMI20051471A1 (it) * 2005-07-28 2007-01-29 Mec Trinca Colonel Silvio & Figlio Dispositivo di mlovimentazione di navetta per macchine tessili con navetta
JP2007119951A (ja) * 2005-10-28 2007-05-17 Tsudakoma Corp レピア織機におけるレピア電動駆動装置およびその制御方法
CN102252813B (zh) * 2011-04-28 2013-01-09 上海交通大学 具有机械容错功能的大型重载振动模拟器

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3037575A3 (en) 2016-11-30
CN105714453A (zh) 2016-06-29
EP3037575A2 (en) 2016-06-29
JP6708405B2 (ja) 2020-06-10
TR201810500T4 (tr) 2018-08-27
CN105714453B (zh) 2018-08-03
HK1225421B (zh) 2017-09-08
JP2016128620A (ja) 2016-07-14

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