EP3330417B1 - Control leverage mechanism with a tuck-in device having a travelling working head for weaving machines - Google Patents

Control leverage mechanism with a tuck-in device having a travelling working head for weaving machines Download PDF

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Publication number
EP3330417B1
EP3330417B1 EP17204305.1A EP17204305A EP3330417B1 EP 3330417 B1 EP3330417 B1 EP 3330417B1 EP 17204305 A EP17204305 A EP 17204305A EP 3330417 B1 EP3330417 B1 EP 3330417B1
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EP
European Patent Office
Prior art keywords
tuck
leverage mechanism
travelling
head
sley
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EP17204305.1A
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German (de)
English (en)
French (fr)
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EP3330417A1 (en
Inventor
Andrea Panzetti
Thomas PARIS
Francesco Alghisi
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Itema SpA
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Itema SpA
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    • 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
    • D03D47/40—Forming selvedges
    • D03D47/48—Forming selvedges by inserting cut end of weft in next shed, e.g. by tucking, by blowing

Definitions

  • the present invention relates to a control leverage mechanism for tuck-in devices for weaving machines and, in particular, for tuck-in devices whose working head is alternately movable in the direction of the warp, during each weft insertion cycle.
  • Devices for selvedge formation consist of mechanical, electrical, pneumatic devices, or combinations thereof, which are used in shuttle-less looms to form a false selvedge (so defined in contrast to the actual selvedge that is formed in shuttle looms) along the lateral edge of the fabric being weaved, securely fixing the weft-ends projecting laterally from the piece of fabric after the insertion and cutting operations of the weft threads.
  • This operation is achieved by means of a tuck-in device working head which, with various possible mechanical, electronic, pneumatic, or mixed operating modes, grabs the free weft-end of the last inserted weft, immediately after the shed closure and the reed beating-up on that weft, and reinserts it immediately in the shed, thus anticipating both the shed closure and the reed beating-up on the next weft, so that the weft-end itself is held permanently in position between the warp yarns along with said subsequent weft, thus allowing the formation of the selvedge, as an alternative to the free fringe of weft-ends, with considerable advantages in terms of stability and strength of the edges of the fabric during subsequent fabric processing and manipulations.
  • Tuck-in devices are more frequently equipped with a fixed working head and are positioned on both sides of the piece of fabric that is machined alongside the reed. Since often one or more pieces having a reduced width are woven at the same time on the full width of the loom, in order to allow the positioning of the tuck-in device with a fixed working head inside the loom shed, it is obviously necessary to shorten or cut the reed in two or more parts, otherwise there would be a mechanical interference between the reed and the tuck-in device during the movement of the reed.
  • the tuck-in devices provided with a travelling working head - in the following also briefly named as “travelling-head tuck-in devices” - solve this problem thanks to the fact that their travelling-head is provided with an alternating movement in the direction of the warp yarns, which allows the backward movement of said working head during the reed beating-up step and the subsequent quick forward movement of the same in the immediately following step. It is therefore possible to operate these tuck-in devices with an entire reed, i.e. a reed extending over the whole width of the loom regardless of the size and the number of pieces of fabric simultaneously worked on the loom.
  • the travelling-head of the tuck-in device disclosed in the aforementioned patent was then made integral, according to a previously-known arrangement, to a weft cut-off device, so that it would follow the head of the tuck-in device in its alternating motion in the longitudinal direction, so as to perform weft cutting at the selected time, after weft insertion in the shed.
  • the control of said cutting device was independent of the control of the travelling-head of the tuck-in device and was normally performed by a pneumatic or electrical device.
  • EP 30 73 003 A1 discloses a control leverage mechanism of a travelling-head tuck-in device for a weaving loom comprising a first articulated quadrilateral, the end hinges of which are fixed to the loom, which takes the alternate movement from the loom sley, a connecting rod-crank mechanism which receives on the crank the movement from the first articulated quadrilateral and transmits it through a connecting rod to the travelling head of the tuck-in device on which the moving end of said connecting rod is hinged; and an articulated parallelogram which connects the body of the tuck-in device to the travelling head of the same, for guiding said travelling head of the tuck-in device between a forward home position and a backward operating position, along an arc wide enough to approximate a rectilinear movement.
  • EP-2176455 discloses a method for forming a selvedge, wherein the travelling tuck-in device is integrally fixed to the reed and thus moves in synchronism with the same.
  • a first critical point of the control of the travelling-head of the above shown tuck-in device lies in the linear guides on which the travelling-head of the tuck-in device slides.
  • These guides are in fact delicate components that generally require a lubrication system or, at least, regular greasing operations to provide a regular performance and a satisfactory life span, in order to prevent wear from appearing too quickly, as well as to avoid the formation of clearances which reduce the reliability of the device.
  • a second critical point can be seen in the cam system per se, and is related to the need to provide proper lubrication, or at least a regular greasing of the cam followers. Moreover, such cam followers pose serious reliability issues in this kind of applications.
  • a third drawback is finally connected to the necessary arrangement of a separate control for the weft cutter.
  • pneumatic cutting devices have delayed response issues which complicate their handling.
  • Electric-type servocontrols which have a completely satisfactory functionality, still have high costs and are demanding from the hardware and software implementation point of view.
  • a first object of the present invention is to provide a travelling-head tuck-in device provided with a newly conceived control which does not require the use of cylindrical guides to obtain the alternate translational movement of the travelling-head.
  • a second object of the present invention is the elimination of a system involving the use of any cam system to generate the alternate motion of the travelling-head.
  • a further additional object of the present invention is finally to provide a tuck-in device wherein the weft cutting operation can be performed without the use of pneumatic or electric actuators, to achieve a simpler and more cost-effective construction.
  • the terms "forward” and “advancement” are always intended as referring to the advancement direction of the fabric on the loom, corresponding to the beating-up movement of the reed.
  • the terms “back” and “backward” obviously refer to the opposite direction.
  • the right and left side of the loom are referred to the position normally occupied by the weaver, i.e. facing the loom from the side of the same from which the fabric being weaved comes out.
  • the control leverage mechanism of a tuck-in device in order to achieve the above highlighted first and second objects, comprises a first articulated quadrilateral Q1, whose end hinges 1 and 2 ( Fig. 5 ) are integral to the loom and which takes the alternate movement from the sley S of the loom.
  • the same sley S forms the first lever of the articulated quadrilateral Q1, which then comprises a short forward-transmission connecting rod L1 and a long terminal lever L2, hinged on the end hinge 2, integral with the body of the tuck-in device C.
  • the articulated quadrilateral Ql therefore comprises said two hinges 1, 2 fixed with respect to the loom, and two movable hinges 3, 4 connecting the connecting rod L1 respectively to the sley S, through a fork support 5, and to the terminal lever L2.
  • the fork support 5, in a per-se known manner, is slidable on a guiding rail integral with the sley S and can be secured in any desired position along the same.
  • the travelling-head T of the tuck-in device is integral with the lever L2, at an approximately central position of the same.
  • the first articulated quadrilateral Q1 has therefore the function of taking the movement from the sley S to generate the rotation of the lever L2 on the hinge 2 through the connecting rod L1 and, consequently, the alternate movement of the travelling-head T.
  • Such movement of the tuck-in device occurs therefore along a circle arc having its centre in the hinge 2.
  • the lever L2 extends towards the upper part of the loom, so as to make it easier and quicker to position the tuck-in device on the respective guiding rails, one of which is fixed in relation to the loom, while the other is integral with the sley S.
  • This arrangement is not, however, necessary; in view of the existing spaces in the loom, the terminal lever L2 could thus also develop in other directions.
  • the lever L2 has a considerable length; preferably this length is equal to or greater than the length of the lever formed by the sley S, and precisely that portion of the sley between the hinge 1 and the hinge 3.
  • All the hinges 2, 3 and 4 of the leverage mechanism preferably comprise double bearings to allow for an easy centring of the lever mechanism when positioning the tuck-in device on the loom and also a clearance-free movement of the lever L2 which carries the travelling-head T during the operation of the loom.
  • the stroke of the travelling-head T of the tuck-in device has a much smaller length than that of the reed P fixed on the top of the sley, depending on the different distance of these two devices from the respective rotation centres.
  • the arrangement of the levers L1 and L2 is such that said levers, or more precisely the segments connecting the respective rotation centres, are approximately perpendicular to each other, when the reed P is beating-up the weft, so that at the beginning of the backward movement of the reed P the travelling-head T has its maximum speed, and then slows down when it approaches the area were the tucking-in can be effectively performed.
  • the movement of the sley S is transferred to the travelling-head T in a suitably modulated manner, and precisely with a reduced movement length, with a reduced average speed and with a relative stay time in the tucking-in working area longer than the approaching and displacement time of the travelling-head T with respect to said area.
  • the cutting of the weft is performed by means of an electrical servocontrol M, integral with the body C of the tuck-in device, which operates a lever 6 controlling the cutting device adjacent to the travelling-head T of the tuck-in device.
  • the electrical servocontrol M is absent and the operation of the cutting device is instead operated by a second articulated quadrilateral, which takes movement from the lever L2 of the first articulated quadrilateral, similarly to what is disclosed in patent application EP-3073003 on behalf of the same Applicant, which content is herewith enclosed by reference.
  • the third object of the present invention can also be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Sewing Machines And Sewing (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP17204305.1A 2016-12-02 2017-11-29 Control leverage mechanism with a tuck-in device having a travelling working head for weaving machines Active EP3330417B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102016000122838A IT201600122838A1 (it) 2016-12-02 2016-12-02 Leverismo di comando per cimossatrice a testa di lavoro mobile per macchine tessili

Publications (2)

Publication Number Publication Date
EP3330417A1 EP3330417A1 (en) 2018-06-06
EP3330417B1 true EP3330417B1 (en) 2021-12-15

Family

ID=58402041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17204305.1A Active EP3330417B1 (en) 2016-12-02 2017-11-29 Control leverage mechanism with a tuck-in device having a travelling working head for weaving machines

Country Status (5)

Country Link
EP (1) EP3330417B1 (zh)
JP (1) JP7037342B2 (zh)
CN (1) CN108149366B (zh)
HK (1) HK1249769A1 (zh)
IT (1) IT201600122838A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7140640B2 (ja) * 2018-11-07 2022-09-21 津田駒工業株式会社 空気噴射式織機におけるエアタックイン装置
CN110016763B (zh) * 2019-04-28 2024-08-30 徐州恒辉编织机械有限公司 一种多功能可变换轨道盘根编织机

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH436156A (de) * 1966-04-15 1967-05-15 Rueti Ag Maschf Einrichtung zum Herstellen einer Gewebekante
JPS5213407Y2 (zh) * 1973-04-18 1977-03-25
JPS54156862A (en) * 1978-05-30 1979-12-11 Ishikawa Seisakusho Kk Apparatus for cutting and gripping weft yarn end in tuck in apparatus
US4489762A (en) * 1983-04-11 1984-12-25 Draper Corporation Weaving loom selvedge trimmer drive mechanism
DE4443899C1 (de) * 1994-12-09 1995-11-23 Dornier Gmbh Lindauer Webmaschine mit einer Kombination aus Schneidvorrichtung und Einleger
BE1016183A3 (nl) * 2004-09-08 2006-04-04 Picanol Nv Werkwijze en inrichting voor het klemmen van een inslagdraad bij een weefmachine.
DE502006007250D1 (de) 2005-02-23 2010-08-05 Itema Switzerland Ltd Leistenleger für Schussfäden
JP4351188B2 (ja) 2005-06-21 2009-10-28 株式会社日立製作所 アクチュエータ装置及びその組み付け方法
ITVI20110255A1 (it) * 2011-09-22 2013-03-23 Ohg F Lli Manea S R L Dispositivo per la formazione di una cimossa rientrata del tessuto in telai senza navetta
CN202415854U (zh) * 2012-02-03 2012-09-05 陈广娟 喷水平织机纬线折边装置
JP6003868B2 (ja) 2013-11-14 2016-10-05 トヨタ自動車株式会社 可変動弁装置
CN203700662U (zh) * 2013-12-23 2014-07-09 青岛天一红旗软控科技有限公司 一种喷气织机气动折入边装置
EP3073003B1 (en) * 2015-03-26 2020-04-01 ITEMA S.p.A. Weaving loom with a tuck-in device with traveling operating head comprising a control leverage mechanism

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP3330417A1 (en) 2018-06-06
CN108149366B (zh) 2021-09-28
JP7037342B2 (ja) 2022-03-16
CN108149366A (zh) 2018-06-12
IT201600122838A1 (it) 2018-06-02
HK1249769A1 (zh) 2018-11-09
JP2018115415A (ja) 2018-07-26

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