EP0534541A1 - Procédé pour retirer automatiquement un fil de trame cassé de la foule sur un métier à tisser à jet d'air et dispositif pneumomécanique utilisé dans ce procédé - Google Patents

Procédé pour retirer automatiquement un fil de trame cassé de la foule sur un métier à tisser à jet d'air et dispositif pneumomécanique utilisé dans ce procédé Download PDF

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Publication number
EP0534541A1
EP0534541A1 EP92202872A EP92202872A EP0534541A1 EP 0534541 A1 EP0534541 A1 EP 0534541A1 EP 92202872 A EP92202872 A EP 92202872A EP 92202872 A EP92202872 A EP 92202872A EP 0534541 A1 EP0534541 A1 EP 0534541A1
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EP
European Patent Office
Prior art keywords
weft
yarn
loom
pneumomechanical
shed
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.)
Granted
Application number
EP92202872A
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German (de)
English (en)
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EP0534541B1 (fr
Inventor
Renato Granelli
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Promatech SpA
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SOMET Societa Meccanica Tessile SpA
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Application filed by SOMET Societa Meccanica Tessile SpA filed Critical SOMET Societa Meccanica Tessile SpA
Publication of EP0534541A1 publication Critical patent/EP0534541A1/fr
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Publication of EP0534541B1 publication Critical patent/EP0534541B1/fr
Anticipated expiration legal-status Critical
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
    • D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
    • D03D51/085—Extraction of defective weft

Definitions

  • the present invention concerns a method to pull out a faulty weft from the shed in air looms and, in particular, a method specially suited to successfully pull out the weft yarns which, due to their characteristics (for instance, cotton yarns), get entangled with the warp yarns.
  • the invention also concerns a pneumomechanical device used in said method to pull out the faulty weft.
  • the loom comprises a device which controls that the weft yarn has correctly reached loom outlet, and which provides to stop the loom and the working of the weft yarn cutting device whenever the yarn does not reach that position, or reaches it in an irregular way. After this operation - eventually followed by a backward stroke of the loom, to free the weft yarn from the warp yarns if these have already interwoven with the same - those which follow vary according to the different known methods, as better described hereinafter.
  • the first method of prior art provides for a mechanical windup device, positioned at loom inlet, to draw the faulty weft by simply pulling it out from the shed.
  • Said device is in fact inserted along the path of the weft yarn - which, as said above, has not yet been cut - and thus simultaneously winds up both the faulty weft, already inserted in the shed, and new weft yarn fed from the weft feeding devices.
  • the windup device is freed from the yarn skein wound thereon and moved back to its rest position, and the loom can be started again.
  • This method has the serious drawback lying in the fact that the faulty weft, inserted in the shed and already beaten, shows a high resistance to being pulled out directly from the shed, since it tightly adheres to the warp yarns and to the previous weft yarn, against which it has been beaten.
  • This method can therefore be applied only in few cases, for example with fabrics consisting of synthetic and particularly glossy yarns, which have a very low adherence.
  • the excessive pulling stress can cause breakage of the faulty weft yarn, or even of the warp yarns, and anyhow easily determines a misalignment of these last ones, thus possibly giving rise to defects or anyhow to discontinuances in the fabric.
  • the windup device is positioned at a certain distance from the weft yarn path, towards the warp beam.
  • this is deviated in the windup device by means of a compressed air jet.
  • the faulty weft is then pulled out following a certain angle in respect of the weft yarn path and this slightly favours the separation of the faulty weft yarn from the warp yarns.
  • the mechanical pulling action is too strong and it can easily cause the breakage of the faulty weft yarn or of the warp yarns, or even an undesirable displacement of these last ones.
  • the weft yarn feeding device is controlled so as to feed - when the loom stops due to a faulty weft insertion - a double weft, which is launched through the shed thanks to the action of the secondary nozzles, forming a loop which moves towards loom outlet.
  • a pneumatic yarn suction device which sucks in the loop formed by the double weft freely launched through the shed, pulling it slightly.
  • the weft yarn is cut in correspondence of loom inlet and the yarn is sucked in by the suction device, with a backward pulling action (peeling or adhesive tape effect) on the faulty weft.
  • the beaten weft can be more easily freed - without damaging the fabric being woven - even when there is a higher adherence between weft and warp yarns.
  • This method therefore allows to work with many types of synthetic yarns, provided that they are suitably drawn and thus not fluffy.
  • the pulling force pneumatically imparted on the weft cannot in fact exceed certain values, whereby this method cannot be used to treat synthetic fluffy yarns or yarns with short fibers, and natural fiber yarns.
  • This second method has also another limitation.
  • the weft yarn is often successfully freed from the pneumatic action of the suction device throughout its length, except at its tail which gets more easily entangled with the warp yarns, thus opposing the pulling action.
  • the weft yarn is not even cut when the loop formed therefrom has been sucked into the suction device; on the contrary, weft yarn is fed into the shed until suitable detection devices, prearranged in the suction device, have detected the unwinding of the loop and thus the full disentanglement of the faulty weft from the shed.
  • a last inconvenience is instead present in all the aforedescribed known devices making use of photoelectric cells to detect the presence or absence of weft yarn, in combination with suction devices.
  • Such photoelectric cells are in fact rapidly soiled by the dust and oily residues present in the compressed air jet, and can easily give wrong indications if they are not subjected to accurate and frequent cleaning operations.
  • the object of the present invention is therefore to supply a method to automatically pull out a faulty weft from the shed in air looms, which guarantees a high reliability - independently from the type of yarn being woven - and which is thus particularly suited to weave highly adherent yarns, as natural fiber yarns.
  • Another object of the present invention is to supply a method as described heretofore, which does not require an excessive use of yarn, or too much compressed air consumption for its operation.
  • a further object of the present invention is to supply a pneumomechanical pullout device, particularly suited to correctly carry out the method according to the invention.
  • said device does not show the inconveniences of the known devices, as it excludes all possibility of accidental weft yarn breakage, guaranteeing moreover a high and long reliability of the optical sensors detecting said yarn.
  • said objects are reached with a method to automatically pull out a faulty weft from the shed in air looms - of the type in which, when the weft yarn does not reach loom outlet, its cutting is prevented and the loom is simultaneously stopped, and in which, after the loom has been reset in the position of insertion of the faulty weft, a double weft is freely launched through the shed, so as to form a loop emerging from loom outlet - characterized in that, the weft loop emerging from loom outlet is conveyed by an air stream up to a pneumomechanical pullout device, into which it is pneumatically sucked and/or mechanically drawn, after a cutting device has cut the weft yarn at loom inlet.
  • the aforespecified method is preferably carried out with a pneumomechanical device to automatically pull out a faulty weft from the shed in air looms, at the outlet thereof, characterized in that it comprises a suction mouth, apt to suck in the loop formed by a double weft freely launched through the shed, an inner duct connected at one end to said suction mouth and at the other end to a suction unit, weft yarn gripping members, positioned across said duct, apt to intermittently draw the weft yarn, and means to protect from dirt the yarn detection optical sensor.
  • the faulty weft yarn is pulled out from the shed, at loom outlet, by a pneumomechanical device allowing to pull out the faulty weft through the combined action of a suction device and of a mechanical intermittent drawing device.
  • Said pneumomechanical device - as opposed to the known devices - allows to perfectly adjust the power of the maximum pulling force imparted on the weft yarn, thereby preventing its breakage in any condition. Since the faulty weft is pulled out at loom outlet - namely by being pulled backward - one obtains the additional advantage deriving from the peeling or adhesive tape effect, both in the pneumatic pulling out step and in the mechanical drawing step.
  • the Applicant has accomplished the present invention after having considered that the automatic methods to pull out a faulty weft, proposed by prior art, do not guarantee a perfect quality of the fabric.
  • the pulling out of the faulty weft by means of mechanical devices may end up with the breakage thereof (a length of which may remain entangled in the shed), or with the misalignment of the warp yarns, even if a final signal of successful pullout has been issued, thus determining the automatic restart of the weaving operation.
  • the woven fabric will show defects such as the presence of incomplete wefts or of an irregular warp.
  • the method according to the present invention fully reaches this object, as the mechanical drawing action to pull out the faulty weft is carried only to an extent such as not to break said weft, thereby preventing the presence in the fabric of broken wefts or of other defects.
  • FIGS 1 to 8 which diagrammatically illustrate the weaving zone of an air loom - show the different steps to pull out a faulty weft yarn with the method according to the present invention.
  • the nozzle 1, positioned at loom inlet, is the last member of the device feeding the weft yarn 2.
  • Said weft yarn travels across the shed 3, launched by the action of the main nozzle 1 and of the secondary nozzles 4 positioned along said shed, up to reaching loom outlet.
  • the weft yarn 2 is arranged between the warp yarns 5, suitably parted, and is then beaten by a reed (not shown) against the fabric 6 being formed.
  • an optical sensor in the form of a photoelectric cell or like, apt to detect the correct arrival of the weft yarn and to send a warning signal, to stop the loom, in case said weft yarn - due to breakage, wrong feeding, or other causes - should not have completed its travelling path across the shed 3.
  • the yarn sensor positioned at loom outlet detects a faulty weft insertion (for instance, a short or broken weft, as shown in fig. 1), it simultaneously operates an automatic cycle to pull out the faulty weft, which comprises the following steps.
  • a faulty weft insertion for instance, a short or broken weft, as shown in fig. 1
  • loom braking is started and the yarn cutting device 11 positioned at loom inlet is simultaneously stopped from working, so that the faulty weft inserted in the shed remains physically connected to the weft yarn 2 being fed through the nozzle 1.
  • a weft turn 2a is released from the yarn feeding device, so as to prevent weft yarn breakage between the nozzle 1 and loom inlet, as reed beating up takes place.
  • the turn 2a is held up by a blow device 8, to avoid that any excess yarn may enter the shed, entangling with the warp yarns.
  • the blow device 8 is operative while the cutting device 11 is at rest.
  • An optical sensor 18 (figs. 9 and 10) detects the inlet of the loop 7 into the device 10 and operates the cutting device 11, which cuts the yarn downstream of the nozzle 1 (fig. 3) so that said yarn can be sucked into the device 10.
  • the sucking action of the device 10 is now combined with the blowing action of the secondary nozzles 4, which are operated in sequence from the outlet to the inlet of the loom. If this exclusively pneumatic pulling action is sufficient to disentangle the faulty weft from the warp yarns (fig. 4), said weft will be fully sucked into and expelled from the device 10, so that the optical sensor will detect the absence of yarn, allowing the loom to start again.
  • the power of the suction jet is regulated according to the mechanical strength of the weft yarn so as to prevent any possible breakage thereof.
  • the optical sensor will continue to detect the presence of weft inside the device 10 (fig. 5). After a certain time, the sucking action of the device 10 and the blowing action of the nozzles 4 are stopped, and the mechanical part of said pneumomechanical device 10 is operated (as shown in fig. 6).
  • the mechanical action imparted on the weft yarn consists in an intermittent drawing action of modest amplitude (up to 1-2 cm), by which the weft yarn is urged to disentangle from the warp yarns.
  • the amplitude of said intermittent drawing action is regulated according to the characteristics of the yarn being woven, so that in any case (i.e. even when it fails to disentangle) said yarn keeps within the range of its elastic deformations and thus incurs no danger of breakage.
  • the optical sensor still detects the presence of weft yarn in the device 10, a stop signal is issued, requiring the presence of an operator.
  • This allows to obtain a very high working reliability for what concerns the final quality of the fabric.
  • the faulty weft is in fact automatically pulled out only when this can be done without breaking the same, or anyhow stressing it to an extent such as to disturb the arrangement of the warp yarns.
  • the yarn is successfully pulled out in a number of cases which can well be compared to that of the devices of prior art, without however presenting the drawbacks thereof.
  • the pneumomechanical device 10 is illustrated in further detail in fig. 9. It consists of a casing 12, provided with a cylindrical cavity or duct 13 into which can be produced, by any known means, an air stream in the direction of arrow F. Such a result can be obtained for example by means of a suitably inclined blow device 14, leading into the duct 13. This latter is connected, at one end, to the already described suction mouth 9 - opening towards the shed 3, so as to easily suck in the loop 7 formed by the weft yarn 2 coming out from the shed 3 - and, at the other end, to the intermittent mechanical drawing device forming part of the pneumomechanical device 10.
  • Said intermittent mechanical device consists of a pair of grippers 15, hinged onto a support 16.
  • the grippers 15 can be closed by means of an electric or pneumatic control.
  • the support 16 is apt to translate in a direction parallel to the axis of the duct 13, between a rest position 16 and a working position 16a (shown in dashes in fig. 9), under the control of a linear actuator 17, preferably of pneumatic type.
  • the drawing stroke of the actuator 17 can be adjusted according to the elasticity of the yarn - as previously pointed out - so that the alternate pulling stress imparted on said yarn may always keep below its breaking value, with a fair margin of safety.
  • the device 10 comprises - in known manner - an optical sensor, for instance in the form of a photoelectric cell 18, to detect the presence of weft yarn 2 inside said device.
  • an optical sensor for instance in the form of a photoelectric cell 18, to detect the presence of weft yarn 2 inside said device.
  • means are provided to protect the photoelectric cell 18 from dirt, so as to guarantee a reliable working thereof for long periods of time and, at the same time, facilitate its cleaning.
  • Said protection means mainly consist of a shutter 19 - illustrated in figs. 10 and 11 - movable between a working position 19 and a rest position 19a (shown in dashes in fig. 11), under the control of a preferably pneumatic linear actuator 20.
  • the shutter 19 In the working position, the shutter 19 fully closes the suction mouth 9 of the device 10, preventing the loom air stream from penetrating therein and depositing dust and oily residues on the surface of the photoelectric cell 18.
  • the shutter 19 is operated simultaneously with the blow device 14 so as to keep the duct 13 open only for the time strictly required to allow the passage of the weft yarn.
  • Said protection means can moreover comprise a device to screen the photoelectric cell 18, which will hence not come in direct contact with the air stream blowing through the duct 13.
  • Said screening preferably consists of an antistatic glass tube 21, which has an inner section equal to that of the duct 13 and which faces the photoelectric cell 18. The inner surface of said tube can be very rapidly cleaned, whenever required, by simply introducing a brush into the suction mouth 9.
  • the power of the pulling action can moreover be controlled, both in the pneumatic and in the mechanical cycle, by suitably adjusting a power reducer of the blow device 14 and, respectively, the stroke of the linear actuator 17, according to the count and other physical characteristics of the yarn being woven. This hence allows to automatically pull out the faulty weft, without any inconveniences, even when weaving natural fiber yarns and, in particular, cotton fibers which combine a high adherence with a scarce mechanical resistance.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
EP92202872A 1991-09-18 1992-09-18 Procédé pour retirer automatiquement un fil de trame cassé de la foule sur un métier à tisser à jet d'air et dispositif pneumomécanique utilisé dans ce procédé Expired - Lifetime EP0534541B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI912464A IT1251495B (it) 1991-09-18 1991-09-18 Metodo per l'estrazione automatica dal passo di un filo di trama rotto in telai di tessitura ad aria e dispositivo pneumomeccanico di avvolgimento utilizzato in detto metodo
ITMI912464 1991-09-18

Publications (2)

Publication Number Publication Date
EP0534541A1 true EP0534541A1 (fr) 1993-03-31
EP0534541B1 EP0534541B1 (fr) 1996-12-18

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ID=11360692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92202872A Expired - Lifetime EP0534541B1 (fr) 1991-09-18 1992-09-18 Procédé pour retirer automatiquement un fil de trame cassé de la foule sur un métier à tisser à jet d'air et dispositif pneumomécanique utilisé dans ce procédé

Country Status (4)

Country Link
EP (1) EP0534541B1 (fr)
DE (1) DE69216027T2 (fr)
ES (1) ES2097861T3 (fr)
IT (1) IT1251495B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0747519A2 (fr) * 1995-06-09 1996-12-11 Lindauer Dornier Gesellschaft M.B.H Procédé pour éviter l'entretissage d'un fil de trame cassé dans un tissu
EP0747520A3 (fr) * 1995-06-09 1997-09-24 Dornier Gmbh Lindauer Procédé et dispositif pour le tirage pneumatique commandé de fils de trame pour la réparation de fil de trame cassé sur métiers à jet d'air
EP0867544A1 (fr) * 1997-03-24 1998-09-30 Tsudakoma Kogyo Kabushiki Kaisha Méthode pour éloigner un fil de trame cassé
EP0976859A1 (fr) * 1998-07-23 2000-02-02 Lindauer Dornier Gesellschaft M.B.H Procédé pour la réparation de fils de trame cassés dans les métiers à tisser, plus particulièrement les métiers à jet d'air
BE1023294B1 (fr) * 2014-09-09 2017-01-25 Kabushiki Kaisha Toyota Jidoshokki Procede pour retirer un fil de trame qui a ete incorrectement entrecroise dans un metier a tisser du type a jet d'air

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0200168A2 (fr) * 1985-04-24 1986-11-05 Tsudakoma Corporation Dispositif pour retirer des fils de trame défectueux dans les métiers à tisser sans navette
NL8602191A (nl) * 1986-08-28 1988-03-16 Picanol Nv Werkwijze voor het verwijderen van een foutieve inslagdraad bij een weefproces.
EP0309013A1 (fr) * 1987-08-26 1989-03-29 Picanol N.V. Procédé pour retirer un fil de trame fautif de la foule sur un métier à tisser et métier à tisser utilisant ce procédé
US4890650A (en) * 1987-08-25 1990-01-02 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Detecting and removing faulty weft in a jet loom

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0200168A2 (fr) * 1985-04-24 1986-11-05 Tsudakoma Corporation Dispositif pour retirer des fils de trame défectueux dans les métiers à tisser sans navette
NL8602191A (nl) * 1986-08-28 1988-03-16 Picanol Nv Werkwijze voor het verwijderen van een foutieve inslagdraad bij een weefproces.
US4890650A (en) * 1987-08-25 1990-01-02 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Detecting and removing faulty weft in a jet loom
EP0309013A1 (fr) * 1987-08-26 1989-03-29 Picanol N.V. Procédé pour retirer un fil de trame fautif de la foule sur un métier à tisser et métier à tisser utilisant ce procédé

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0747519A2 (fr) * 1995-06-09 1996-12-11 Lindauer Dornier Gesellschaft M.B.H Procédé pour éviter l'entretissage d'un fil de trame cassé dans un tissu
DE19521106A1 (de) * 1995-06-09 1996-12-12 Dornier Gmbh Lindauer Verfahren zur Schußstoppbehebung
EP0747519A3 (fr) * 1995-06-09 1997-09-24 Dornier Gmbh Lindauer Procédé pour éviter l'entretissage d'un fil de trame cassé dans un tissu
EP0747520A3 (fr) * 1995-06-09 1997-09-24 Dornier Gmbh Lindauer Procédé et dispositif pour le tirage pneumatique commandé de fils de trame pour la réparation de fil de trame cassé sur métiers à jet d'air
US5746256A (en) * 1995-06-09 1998-05-05 Lindauer Dornier Gesellschaft Mbh Method and apparatus for a controlled pneumatic removal of a faulty weft thread in an air jet loom
EP0867544A1 (fr) * 1997-03-24 1998-09-30 Tsudakoma Kogyo Kabushiki Kaisha Méthode pour éloigner un fil de trame cassé
KR100266959B1 (ko) * 1997-03-24 2000-09-15 데라다 도키오 미스사처리방법
EP0976859A1 (fr) * 1998-07-23 2000-02-02 Lindauer Dornier Gesellschaft M.B.H Procédé pour la réparation de fils de trame cassés dans les métiers à tisser, plus particulièrement les métiers à jet d'air
BE1023294B1 (fr) * 2014-09-09 2017-01-25 Kabushiki Kaisha Toyota Jidoshokki Procede pour retirer un fil de trame qui a ete incorrectement entrecroise dans un metier a tisser du type a jet d'air

Also Published As

Publication number Publication date
DE69216027D1 (de) 1997-01-30
IT1251495B (it) 1995-05-15
DE69216027T2 (de) 1997-04-10
ITMI912464A0 (it) 1991-09-18
ITMI912464A1 (it) 1993-03-18
EP0534541B1 (fr) 1996-12-18
ES2097861T3 (es) 1997-04-16

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