EP0286443A1 - Dispositif pour positionner le fil de trame sur des machines à tisser utilisant un appareil pour la formation de lisières - Google Patents

Dispositif pour positionner le fil de trame sur des machines à tisser utilisant un appareil pour la formation de lisières Download PDF

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Publication number
EP0286443A1
EP0286443A1 EP88303190A EP88303190A EP0286443A1 EP 0286443 A1 EP0286443 A1 EP 0286443A1 EP 88303190 A EP88303190 A EP 88303190A EP 88303190 A EP88303190 A EP 88303190A EP 0286443 A1 EP0286443 A1 EP 0286443A1
Authority
EP
European Patent Office
Prior art keywords
weft
thread
suction
tucking
weft thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88303190A
Other languages
German (de)
English (en)
Inventor
Silvio Bassini
Giovanni Battista Manea
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FRATELLI MANEA S.R.L.
SOCIETA INDUSTRIALE CREMONESE SICREM S.R.L.
Original Assignee
FRATELLI MANEA Srl
Industriale Cremonese Sicrem Srl Soc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FRATELLI MANEA Srl, Industriale Cremonese Sicrem Srl Soc filed Critical FRATELLI MANEA Srl
Publication of EP0286443A1 publication Critical patent/EP0286443A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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 device for positioning the weft on weaving machines which utilise tucking-in selvedgers, also known as re-entering end selvedgers.
  • Fabrics manufactured on weaving machines are generally provided with selvedges which have the function of locking the warp threads of the fabric to prevent them from unravelling. This result is easily obtained if the weft if fed continuously as is the case with traditional shuttle looms, since a loop of the warp thread is created around the last thread of the weft each time the shuttle inverts direction.
  • the selvedges not only ensure that the warp threads do not unravel, but they also ensure that the single warp threads which are inserted are held in place.
  • the tucking-in devices are used from choice especially in the case of industrial fabrics such as, for example, the cord fabrics used to reinforce tyres.
  • tucking-in devices or selvedgers are formed by a reinsertion of the protruding ends of the weft threads cut to a height slightly higher than the reed width.
  • each side of the weaving machine is provided with a nipper for tucking-in the weft thread into the warp and a device which positions the weft. It is a well-known fact that if the machine is to function correctly, the weft must be in a very precise position during weaving so that it can be gripped by the nipper, cut by scissors and re-inserted by a needle.
  • the device normally used for positioning the weft is a false tucking-in selvedger which is constituted by an English looper and a narrow strip of canvas material (0.5-1.5cm) which is produced simultaneously on both sides of the weaving machine and is then discarded once it has served its purpose.
  • This inevitably produces scrapping of material and also the need for auxiliary equipment for the formation of the English loop in the false selvedge, boards for selvedger holders, creel positioners and tensioners and mechanisms for the forward and return movements and collection of false selvedges.
  • the present invention provides a device for positioning the weft on weaving machines which utilise tucking-in selvedgers capable of holding a weft thread fixed in position during the phase of cutting and re-insertion in the warp, characterized by means for holding the weft thread in place and means for the suction of the cut thread.
  • the suction means can be arranged along the line of trajectory of the weft or can be perpendicular to it, the latter position being preferable.
  • the suction means can be a suction nozzle or inlet or a tube connected to a vacuum pump.
  • the holding means can be a nipper, a thread guide, an open ring or a V-shaped hook, around which the warp thread is bent, preferably at an angle of 90°.
  • the weft positioning device is constituted by a suction tube connected to a vacuum pump installed perpendicularly to the direction of the weft thread and provided with a V-shaped slot or cut at the end nearest to the warp thread which has the function of holding the weft thread firmly in position while the selvedger carries out its task.
  • the apex of the V-shaped slot is positioned so that it is exactly in line with the trajectory of the weft thread.
  • the suction inlet is preferably fixed and positioned adjacent to the external side of the scissors of the selvedger.
  • the thread is sucked up by the suction means and can be discharged into a container or a waste collection sack.
  • Thread suction occurs after the phase of insertion of the thread and during shed closing.
  • the positioning device of the invention provides a large number of advantages regarding technological, functional and economic aspects of the equipment. These advantages include:
  • the positioning device of the present invention can also eliminate this inconvenience since an electronic optical sensor can be positioned in correspondence to the suction inlet in the area in which there is turbulence which moves the weft thread and there are no moving mechanical parts which could disturb the optical sensor.
  • the apex of the slot 4 is arranged so that it is exactly in line with the trajectory of a weft thread 5 to be cut and re-entered.
  • Scissors 6 are installed between the suction inlet 1 and the fabric 7.
  • the weft thread 5 is passed through warp threads 8 using well-known methods such as, for example, a jet of liquid either air or water pressurised. When the weft thread 5 exits it passes through a nipper 9 and between the open blades of the scissors 6 and is sucked into the suction tube 1. Under this suction force, the weft thread 5 locates itself at the apex of the V-shaped slot 4 and is held firmly in position in the phase in which the selvedger comes into operation.
  • the thread 5 is then cut by the scissors 6 and taken by a needle 10 which proceeds to re-insert it through the warp using known techniques.
  • the cut thread is sucked up by the suction inlet 3 and collected into sacks or other waste containers.
  • the positioning device of this present invention can be installed on one side or on both sides of the weaving machine, replacing the false selvedge and providing the advantages mentioned above.
  • an electronic optical sensor 11 is positioned on the wall of the suction inlet 3 which has been provided with an aperture for the passage of the sensor ray.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP88303190A 1987-04-10 1988-04-08 Dispositif pour positionner le fil de trame sur des machines à tisser utilisant un appareil pour la formation de lisières Withdrawn EP0286443A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2006287 1987-04-10
IT8720062A IT1208212B (it) 1987-04-10 1987-04-10 Dispositivo posizionatore dellatrama sulle macchine per tessere che utilizzano cimossatrici a capo rientrante.

Publications (1)

Publication Number Publication Date
EP0286443A1 true EP0286443A1 (fr) 1988-10-12

Family

ID=11163509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88303190A Withdrawn EP0286443A1 (fr) 1987-04-10 1988-04-08 Dispositif pour positionner le fil de trame sur des machines à tisser utilisant un appareil pour la formation de lisières

Country Status (2)

Country Link
EP (1) EP0286443A1 (fr)
IT (1) IT1208212B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1004137A3 (fr) * 1990-08-29 1992-09-29 Vamatex Spa Dispositif perfectionne de formation de la lisiere dans les metiers sans navettes.
EP0778364A3 (fr) * 1995-12-08 1999-04-21 Lindauer Dornier Gesellschaft M.B.H Procédé et métier à tisser pour la manipulation d'un fil de trame
EP3073003A1 (fr) 2015-03-26 2016-09-28 ITEMA S.p.A. Mécanisme de levier de commande pour dispositif de rentrage avec tête d'exploitation mobile destiné à des métiers à tisser

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3425461A (en) * 1966-10-14 1969-02-04 Marshall John D Selvage tucking-in device
FR2141808A1 (fr) * 1971-06-18 1973-01-26 Dewas Raymond
FR2249984A1 (fr) * 1973-11-06 1975-05-30 Nuovo Pignone Spa
US4078586A (en) * 1976-08-26 1978-03-14 Adolph Saurer Limited Method and apparatus for producing a selvage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3425461A (en) * 1966-10-14 1969-02-04 Marshall John D Selvage tucking-in device
FR2141808A1 (fr) * 1971-06-18 1973-01-26 Dewas Raymond
FR2249984A1 (fr) * 1973-11-06 1975-05-30 Nuovo Pignone Spa
US4078586A (en) * 1976-08-26 1978-03-14 Adolph Saurer Limited Method and apparatus for producing a selvage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1004137A3 (fr) * 1990-08-29 1992-09-29 Vamatex Spa Dispositif perfectionne de formation de la lisiere dans les metiers sans navettes.
US5158119A (en) * 1990-08-29 1992-10-27 Vamatex S.P.A. Selvedge forming device for shuttleless looms with linear motor control system
EP0778364A3 (fr) * 1995-12-08 1999-04-21 Lindauer Dornier Gesellschaft M.B.H Procédé et métier à tisser pour la manipulation d'un fil de trame
EP3073003A1 (fr) 2015-03-26 2016-09-28 ITEMA S.p.A. Mécanisme de levier de commande pour dispositif de rentrage avec tête d'exploitation mobile destiné à des métiers à tisser

Also Published As

Publication number Publication date
IT1208212B (it) 1989-06-12
IT8720062A0 (it) 1987-04-10

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