EP0645485B1 - Pneumatische Schussfadenspannvorrichtung für Düsenwebmaschinen, mit Schussfadenbruchkontrolle - Google Patents

Pneumatische Schussfadenspannvorrichtung für Düsenwebmaschinen, mit Schussfadenbruchkontrolle Download PDF

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Publication number
EP0645485B1
EP0645485B1 EP94114955A EP94114955A EP0645485B1 EP 0645485 B1 EP0645485 B1 EP 0645485B1 EP 94114955 A EP94114955 A EP 94114955A EP 94114955 A EP94114955 A EP 94114955A EP 0645485 B1 EP0645485 B1 EP 0645485B1
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EP
European Patent Office
Prior art keywords
weft
channel
tensioning device
yarn
previous
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.)
Expired - Lifetime
Application number
EP94114955A
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English (en)
French (fr)
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EP0645485A1 (de
Inventor
Renato Granelli
Ettore Viscardi
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Promatech SpA
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SOMET Societa Meccanica Tessile 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
    • D03D47/28—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
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/308—Stretching or holding the weft
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions

Definitions

  • the present invention concerns a pneumatic weft tensioning safety device for air looms, providing for an efficient and unfailing control of any broken wefts, independently from how the weft may appear at the outlet of the shed due to breakage.
  • the weft yarn is fed and guided along the loom shed by a first air jet, blown by a main nozzle positioned at the inlet of the shed, and by a plurality of intermediate air jets, blown by secondary nozzles positioned at regular intervals along the shed.
  • the weft yarn, driven by these compressed air jets, moves along a channel having a substantially C-shaped cross section, defined by the dents of the reed having, for the purpose, a fully special configuration.
  • the time taken for said oscillations to fully dampen is longer than the time elapsing between the insertion of a weft and that of the following weft, whereby - in these conditions - the fabric being formed may most likely include also loose wefts or, alternatively, over-stretched wefts, which in any case determine the presence of faults therein.
  • suction or blowing devices which provide to grip the weft, keeping it tensioned up to the end of reed beating up.
  • a device of this type is for example the one disclosed in FR-A-2497841. This type of devices successfully solves the above problem of the prompt settlement of the weft yarn in the longitudinal sense. Nevertheless, also these devices involve a drawback, which is particularly felt when weaving medium and high-quality fabrics.
  • the looms meant for this type of weaving are now-a-days more and more often equipped with a double system to control the weft at its arrival, on the loom side opposite to that of weft insertion.
  • a first photoelectric cell - always present and positioned at the outlet of the shed, in order to control the correct arrival of the weft yarn and thus issue a consent signal for the following weft yarn to be fed - there is associated a second photoelectric cell, positioned along the extention of the weft launching channel, at a suitable distance from the first photoelectric cell.
  • the regular working of the loom is characterized by the fact that this second cell does not detect the presence of a weft yarn.
  • said second cell detects a weft yarn, it means either that said weft yarn is too long - whereby a fault needs to be corrected in the feeding devices - or that it has partially or totally broken; in both cases, a manual operation of control is required on the loom.
  • said second photoelectric cell detects the presence of a weft yarn, it promptly sends a stop signal to the loom.
  • the object of the present invention is to thus supply a pneumatic weft tensioning device free from the above drawback, that is, allowing to perform a correct pneumatic tensioning of the weft yarn and to simultaneously control, without fail, the presence of any long or broken wefts.
  • said object is reached by means of a pneumatic weft tensioning safety device for air looms - of the type in which a weft yarn is launched by air jets into a launching channel formed in the loom reed and, at the outlet of the shed, the free end of said yarn is deviated towards the inlet mouth of a lateral channel by an air jet substantially transversal to the direction of said launching channel - characterized in that it comprises a channel extension aligned to said launching channel, into which leads the outlet mouth of said lateral channel, and means to detect the presence of the weft, positioned in said channel extension downstream of the outlet mouth of said lateral channel.
  • the pneumatic weft tensioning safety device is positioned, as already said, on the loom side opposite to that of weft insertion.
  • said device consists of a plate 1 - preferably made of a light alloy - fixed to the sley 2 and having a cross section similar to that of the reed 3, to which it is fixedly connected through a clamp board 4.
  • the launching channel 5 formed by the dents of the reed 3 extends, at the outlet of the shed, into a channel 6 formed in the plate 1, said channel 6 having the same cross-section as the channel 5 and being aligned therewith.
  • a first photoelectric cell 7 controlling that the weft yarn regularly reaches the outlet side of the shed, and a small lateral reed 8 allowing to form the split selvedge.
  • a cover 9 is fixed to the plate 1 by screws 10.
  • a channel 11 for weft yarn tensioning Into the inner part of the cover 9 there is formed, by suitable machining, a channel 11 for weft yarn tensioning.
  • the channel 11 has an initial length 11a, on the side close to the reed 8, which leads into the extension channel 6 in a direction substantially perpendicular thereto, and a final length 11b which leads into said extension channel 6 further downstream thereof, in a direction almost tangential thereto.
  • the two lengths of the channel 11 are radiused with a variably arc-shaped path, formed in such a way as to oppose the least possible resistance to the advancement therein of the free weft yarn end.
  • the inner surface of the channel 11 and the corresponding surface of the plate 1 should thus be machined in a particularly accurate manner so as to avoid the presence of any roughness which may hinder the regular advancement of the weft yarn inside said channel.
  • a pneumatic blow device 12 On the wall of said extension channel 6 opposite to the inlet mouth of said starting length 11a of the channel 11, there is provided a pneumatic blow device 12 apt to send an air jet across said channel 6, so as to deviate the free weft yarn end into the channel 11 as soon as it emerges from the reed 8.
  • a second photoelectric cell 13 apt to detect the presence of the weft yarn emerging both from said channel 6 and from the tensioning channel 11.
  • the whole aforedescribed pneumatic weft tensioning device is finally apt to slide along the sley 2 and to be fixed thereto in a position at will, by known-type clamping means, according to the transversal dimensions of the reed being used each time.
  • the weft yarn F is launched in known manner into the launching channel 5, by the main nozzle and by the secondary nozzles (not shown), until it leaves the shed and emerges from the reed 8.
  • the correct arrival of the weft yarn in this area is detected by the photoelectric cell 7 which confirms that weaving can be continued.
  • the loom control system operates the blow device 12, by way of a special solenoid valve (not shown), and the air jet blown by said device 12 deviates the weft yarn into the channel 11, wherein said yarn promptly settles both due to the tensioning it undergoes on account of said air jet and due to the friction it undergoes when contacting the walls of the channel 11, especially along its deeply curved path.
  • the free weft yarn ends, which thus penetrate into the channel 11, will be subsequently drawn out therefrom together with the split selvedge - as the fabric weaving process continues - and be eliminated therewith.
  • a second embodiment of the pneumatic weft tensioning safety device according to the present invention has been conceived for the purpose of obtaining a smaller amount of yarn waste and a more homogeneous quality thereof, so as to allow its subsequent re-use.
  • the pneumatic weft tensioning device illustrated therein is fully identical to the one previously described with reference to figs. 1 and 2, except that it does not comprise the small lateral reed 8 whose function is performed by a cutter 14, suitably operated by a pneumatically or electromagnetically controlled linear actuator 15.
  • the function of the strip of fabric formed by the reed 8 is to simply keep the weft yarn tails properly stretched and in order so that, when the split selvedge strip is cut off from the fabric, said weft yarn tails form a perfectly regular fringe.
  • the weft tensioning device of the present invention minimises the weft tensioning device of the present invention, however, each weft yarn is already perfectly stretched and in-line when reed beating up takes place, whereby it is possible to provide for the cutting thereof with the cutter 14 while the blow device 12 is operating, which allows to obtain the same result seen above in the case of the split selvedge, namely a weft tails fringe of perfectly uniform width.
  • the weft tails cut by the cutter 14 are driven into the channel 11 by the blow device 12, and are then sucked in known manner - into a can for gathering the weft yarn ends - by means of a suction funnel 16 facing the outlet of the channel 6.
  • the respective control program should provide for the signal sent by said cell to be ignored from the moment in which the cutter 14 starts to work and for a length of time sufficient to allow the passage of the cut weft tail through channels 11 and 6. This prevents the periodic outlet of the cut tails, passing in front of the photoelectric cell 13, from determining false warning signals.
  • the controlling function of said photoelectric cell remains unaltered, so as to indicate the presence of any long or broken wefts, as explained above.
  • weft tensioning device of the present invention has fully reached its intended object. It in fact allows to fully and safely control any possible type of fault in the weft - without requiring the presence of any additional weft detection means, apart from those already provided now-a-days on looms without a pneumatic weft tensioning device - just thanks to the special by-pass configuration of the weft tensioning channel.

Claims (9)

  1. Pneumatische Schußfadenspannsicherheitsvorrichtung für Düsenwebmaschinen - von der Art, bei der der Schußfaden (F) über Luftstrahlen in einen Schußkanal (5), der in dem Webblatt (3) ausgebildet ist, eingeschossen wird, und wobei das freie Ende des Schußfadens an dem Auslaß des Fachs in Richtung auf den Einlaßmund eines lateralen Kanals (11) von einem Luftstrahl (12), der im wesentlichen quer zu der Richtung des Schußkanals (5) verläuft, abgelenkt wird, dadurch gekennzeichnet, daß die Vorrichtung eine Kanalerstreckung (6) aufweist, die mit dem Schußkanal (5), in den der Auslaßmund des lateralen Kanals (11) führt, ausgerichtet ist, und mit Mitteln (13) zum Erkennen des Vorhandenseins des Schußfadens, die in der Kanalerstreckung (6) stromabwärts des Auslaßmundes des lateralen Kanals (11) positioniert sind.
  2. Schußfadenspannvorrichtung nach Anspruch 1, wobei der Abstand der Erkennungsmittel von dem Auslaß des Fachs ausreichend ist um sicherzustellen, daß die Enden regelmäßiger Schußfäden mit diesem nicht interferieren.
  3. Schußfadenvorrichtung nach Anspruch 2, wobei die Erkennungsmittel (13) ein Warnsignal aussenden, wenn sie das Vorhandensein eines Schußfadens vor ihnen erkennen.
  4. Schußfadenspannvorrichtung nach einem der vorangehenden Ansprüche, wobei die Erkennungsmittel (13) aus einer fotoelektrischen Zelle bestehen.
  5. Schußfadenspannvorrichtung nach einem der vorangehenden Ansprüche mit einer Stützplatte (1), die einen Querschnitt hat, der demjenigen des Blattes (3) ähnlich ist, um so die Kanalerstreckung (6) zu bilden, und mit einer Abdeckung (9), die dazu eingerichtet ist, die Platte (1) mittels Schraubmitteln (10) zu halten, in der wenigstens drei Wandungen des lateralen Kanals (11) ausgebildet sind, wobei die vierte Wandung aus der Stützplatte (1) besteht.
  6. Schußfadenspannvorrichtung nach einem der vorangehenden Ansprüche, wobei der laterale Kanal einen im wesentlichen bogenförmigen Weg aufweist.
  7. Schußfadenspannvorrichtung nach einem der vorangehenden Ansprüche, wobei die Anfangslänge (11a) des lateralen Kanals im wesentlichen senkrecht zu der Kanalerstreckung (6) verläuft und die endliche Länge (11b) des lateralen Kanals (11) fast tangential zu der Erstreckung des Kanals (6) verläuft.
  8. Schußfadenspannvorrichtung nach einem der vorangehenden Ansprüche, weiter mit einer Schußfadenschneideinrichtung (14), die an der Seite der Webmaschine, die derjenigen, an der der Schußfaden eingetragen wird, entgegengesetzt ist, zwischen dem Blatt (3) und dem Einlaßmund des lateralen Kanals (11) positioniert ist.
  9. Schußfadenspannvorrichtung nach Anspruch 8, wobei die Erkennungsmittel (13) gestoppt werden, sobald die Schneideinrichtung (14) den Schußfaden schneidet und für die Zeitdauer, die erforderlich, um es dem geschnitten Faden zu erlauben, vor den Erkennungsmitteln (13) zu gelangen,
EP94114955A 1993-09-23 1994-09-22 Pneumatische Schussfadenspannvorrichtung für Düsenwebmaschinen, mit Schussfadenbruchkontrolle Expired - Lifetime EP0645485B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI932037A IT1272667B (it) 1993-09-23 1993-09-23 Tenditrama pneumatico di sicurezza per talei ad aria, con controllo delle trame rotte.
ITMI932037 1993-09-23

Publications (2)

Publication Number Publication Date
EP0645485A1 EP0645485A1 (de) 1995-03-29
EP0645485B1 true EP0645485B1 (de) 1997-12-03

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Application Number Title Priority Date Filing Date
EP94114955A Expired - Lifetime EP0645485B1 (de) 1993-09-23 1994-09-22 Pneumatische Schussfadenspannvorrichtung für Düsenwebmaschinen, mit Schussfadenbruchkontrolle

Country Status (4)

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EP (1) EP0645485B1 (de)
DE (1) DE69407127T2 (de)
ES (1) ES2110169T3 (de)
IT (1) IT1272667B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19802254C1 (de) * 1998-01-22 1999-08-05 Dornier Gmbh Lindauer Schußfadenstreck- und -detektiereinrichtung für Düsenwebmaschinen, insbesondere mit pneumatischem Schußeintrag
US6076563A (en) * 1998-03-09 2000-06-20 Lindauer Dornier Gesellschaft Mbh Weft stretching and detecting apparatus for a jet weaving loom
DE19810129B4 (de) * 1998-03-09 2004-08-05 Lindauer Dornier Gmbh Schußfadenstreck- und -detektiereinrichtung für Düsenwebmaschinen
DE10115172C1 (de) 2001-06-08 2002-12-19 Dornier Gmbh Lindauer Verfahren zum Überwachen des Schussfadeneintrags in Luftdüsenwebmaschinen und Vorrichtung zum Durchführen des Verfahrens

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH649325A5 (de) * 1980-11-25 1985-05-15 Rueti Ag Maschf Schussfadenueberwachungseinrichtung an einer duesenwebmaschine.
CH649322A5 (de) * 1981-01-13 1985-05-15 Rueti Te Strake Bv Duesenwebmaschine.
US4962794A (en) * 1988-10-28 1990-10-16 Milliken Research Corporation Air jet loom with integral stretch pipe and pick sensor

Also Published As

Publication number Publication date
IT1272667B (it) 1997-06-26
ES2110169T3 (es) 1998-02-01
DE69407127D1 (de) 1998-01-15
EP0645485A1 (de) 1995-03-29
ITMI932037A1 (it) 1995-03-23
DE69407127T2 (de) 1998-03-26
ITMI932037A0 (it) 1993-09-23

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