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EP0311168B1 - Verfahren zum Wiederherstellen eines gebrochenen Kettenfadens an einer Webmaschine und Vorrichtung zur Durchführung dieses Verfahrens - Google Patents

Verfahren zum Wiederherstellen eines gebrochenen Kettenfadens an einer Webmaschine und Vorrichtung zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0311168B1
EP0311168B1 EP19880202070 EP88202070A EP0311168B1 EP 0311168 B1 EP0311168 B1 EP 0311168B1 EP 19880202070 EP19880202070 EP 19880202070 EP 88202070 A EP88202070 A EP 88202070A EP 0311168 B1 EP0311168 B1 EP 0311168B1
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EP
European Patent Office
Prior art keywords
thread
warp
separate
sheet
supply
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
Application number
EP19880202070
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English (en)
French (fr)
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EP0311168A1 (de
Inventor
Henry Shaw
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Picanol NV
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Picanol NV
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Filing date
Publication date
Application filed by Picanol NV filed Critical Picanol NV
Publication of EP0311168A1 publication Critical patent/EP0311168A1/de
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J1/00—Auxiliary apparatus combined with or associated with looms
    • D03J1/004—Detection and repair of broken warp yarns

Definitions

  • This invention concerns a method for repairing a broken warp thread on weaving machines, and devices which use this method, in particular for repairing warp threads in the case of breakages occuring between the warp beam and warp stop motion.
  • the stop signal is generally supplied by a warp stop motion consisting of drop wires which are suspended from the taut warp threads, and which fall down in the case of a break in the warp thread, and make contact with an electrode, as known from Belgian patent no. 899.347, for example.
  • CH 276.690 Another device for automatically stopping textile machines in case of a break in a thread is known of CH 276.690.
  • the broken thread is blown on a carding roller acting as a tensioner, such that the broken thread becomes deviated and activates a switching system.
  • the document CH 276.690 does not provide an automatic repair.
  • the weaver must then join a section of thread between the two thread ends of the broken thread, after which weaving can continue.
  • the object of the present invention is a method whereby the repair of a broken warp thread occurring between the warp beam and warp stop motion can be performed automatically and efficiently, in other words, with very brief weaving machine down time.
  • the method consists essentially in: joining the first thread end of the broken warp thread which is attached to the cloth to a thread from a separate thread supply; restarting the weaving machine; operating on the warp threads adjacent to the above-mentioned thread from the separate thread supply, by means of a mechanism that can operate on the warp threads, by which a thread end can be separated from the warp sheet; and detecting whether the second thread end, attached to the warp beam, has been separated from the warp sheet; and, if said second thread end is detected on said mechanism, joining the second thread end to said thread from the thread supply, after which weaving from the warp beam can continue.
  • said mechanism is automatically deactivated, and the required warp thread continues to be taken from the separate thread supply.
  • Said mechanism for operating on the warp threads preferably consists of a rotating comb-shaped mechanism which combs out the warp sheet.
  • the present invention also concerns a device which uses the above-mentioned method, which can be part of a single weaving machine, or can be as constructed that it serves several weaving machines.
  • Fig. 1 is a schematic diagram of a weaving machine with the following components, which themselves are common technology: the warp beam 1, the warp sheet 2, the warp stop motion 3 with several rows of drop wires 4, the harnesses 5, the shed 6, the reed 7, the woven cloth 8, and the cloth beam 9.
  • the weaving machine includes a device 10 for carrying out the above-mentioned method, consisting essentially of the combination of: a separate thread supply 11; a mechanism 12 for joining the first thread end 15 resulting from the break 13 in the broken warp thread 14, which is still attached to the cloth 8, to the thread 16 from said separate thread supply; a rotating comb-shaped mechanism 17 that can operate on the warp sheet 2 in order to separate the second thread end 18 from the warp sheet 2, where said second thread end 18 is still attached to the warp beam 1; a detector 19 for detecting whether or not the second thread end 18 has been separated from the warp sheet 2; a mechanism for joining the second thread end 18 to the thread 16 attached to the first thread end 15, for which the above-mentioned mechanism 12 is preferably used in the embodiment shown; and a control unit 20, which controls all the above-mentioned components as well as the main drive 21 of the weaving machine, according to a cycle that corresponds to the method described above.
  • a number of mobile thread clips 22, 23 and 24, are also shown
  • the mechanism 12 for joining the above-mentioned threads together can be of any type. It can, for example, consist of a knotting device similar to that described in German patent No. 599.681. It can also consist of a device to form what is known as a welded splice. As the mechanism 12 in itself is common technology, it is only shown schematically in the figures.
  • the rotating comb-shaped mechanism 17 consists essentially of a shaft 26 provided with radial projections 27 or suchlike.
  • the projections 27 can, for example, consist of spokes, blades or brush hairs.
  • the mechanism 17 is mounted so that it can be presented to the warp sheet 2 in such a way that the projections 27 mesh with the warp sheet 2 and unravel from the warp sheet 2 any free thread ends, such as the thread end 18.
  • the shaft 26 can be constructed such that it extends over the full width of the weaving machine.
  • the comb-shaped mechanism 17 can, for example, be mounted on a unit 28 which can travel along a rail 29 serving one or more weaving machines.
  • the comb-shaped mechanism 17 can thus be presented to the warp sheet 2 by means of the outward movement of one or more pneumatic cylinders 30.
  • the drive of the mechanism 17 consists of a motor 31 which provides the rotating movement of the mechanism 17 by means of a suitable transmission 32, for example a belt transmission.
  • the comb-shaped mechanism 17, which is equipped with the above-mentioned detector 19, can for example consist of a rotating arm 34 pivoting about a fixed point 33, which takes up another position if a thread is pressed against it, thereby opening and/or closing a contact 35.
  • Fig. 1 is a schematic diagram of a situation in which a thread break 13 has occurred between the warp beam 1 and the warp stop motion 3 of a weaving machine.
  • the drop wire 4A resting on the broken warp thread 14 falls down onto the corresponding electrode 36, so that an electric contact is made.
  • This signal is used in the conventional manner to shut down the main drive 21 of the weaving machine, via the above-mentioned control unit 20.
  • the control unit 20 will initiate the above-mentioned cycle.
  • the thread end 15 is first located and gripped, for example in clip 23.
  • Methods for the location of the thread end 15 in the warp sheet 2 are also known; one such method, for instance, is described in Belgian patent application no. 8700254 made by the present applicant, and so will not be further explained here.
  • the thread 16 from the separate thread supply 11 is kept in readiness by means of clip 22.
  • the mechanism 12 is presented in an appropriate manner respectively to the thread end 15 and the thread 16 from the separate thread supply 11, and a join, such as a knot 37, is made.
  • a join such as a knot 37
  • the thread end 15 and the thread 16 are tensioned so that they are aligned, before the join 30 is made; in other words, they are essentially parallel to the line connecting the thread guide 38 located adjacent to the warp sheet 2 and the thread tensioner 25.
  • the rotating comb-shaped mechanism 17 is actuated by the above-mentioned pneumatic cylinder 30 and motor 31, so that it can operate on the warp sheet 2 in order to detect the thread end 18. As shown in fig. 3, this thread end is generally tangled among the warp threads 2.
  • the weaving machine is restarted so that weaving can continue early.
  • Automatic start-up of the weaving machine drive 21 can be initiated given two data items: firstly, that the mechanism 12 has made the knot 37, and secondly, that the fallen drop wire 4A has been disconnected from the corresponding electrode 36 by the tautening of the new warp thread 14A.
  • the second thread end 14 will be combed out of the warp sheet 2 by the comb-shaped mechanism 17, as shown in fig. 4, for example, and this will cause the contact 35 on the detector 19 to close.
  • the second thread end 18 is then preferably joined to the above-mentioned warp thread 14A, or in other words thread 16, using the same mechanism 12 to make the join 39, which may for example be a knot, or using some other mechanism.
  • the second thread end 18 is withdrawn from the comb-shaped mechanism 17 by a hook-shaped clip 24 and presented to the knotting device or other mechanism.
  • the weaving machine does not necessarily have to be stopped while the join 39 is being made. It should also be noted that the join 39 is made with the thread end 18 and the warp thread 14A taut and substantially in the same plane as the warp sheet 2, so that, after the join 31 has been made, the completely repaired warp thread 14A remains taut.
  • the rotating comb-shaped mechanism is deactivated if no further thread ends are observed after a given period of time.
  • the new warp thread then continues to be fed from the separate thread supply.
  • the above-mentioned special thread supply 11 does not have to consist of a reel or spool, but can also consist of a piece of thread of a particular length.
  • a rotating comb-shaped mechanism 17 that occupies only part of the width of the warp sheet can also be used.
  • the mechanism 17 is moved transversely across the warp sheet 2 by positioning devices 40 until it reaches the location of the fallen drop wire 4A, which corresponds to the location of the broken warp thread 14.
  • a warp stop motion as described in Belgian patent No. 899.347 can be used for this purpose, with the electrode 36 consisting of various zones depending on the width of the cloth.
  • the mechanism 17 should preferrably have an axial length equal to the length of one zone, and the mechanism 17 should be positioned above the zone in which the break occurred.
  • the above-mentioned positioning device 40 may consist, for example, of a slide 41 or similar, from which the mechanism 17 is suspended by means of the above-mentioned pneumatic cylinders 30, and a worm shaft 44 driven by a motor 42 via a gear transmission 43.
  • the worm shaft 44 can mesh with a worm wheel 45 attached to the slide 41, so that the slide 41 can travel over the full width of the cloth.
  • the transmission 32 as shown in fig. 6, consists of a pinion coupling, but apart from that, it is identical to that shown in fig. 2.
  • the above-mentioned automatic start can be performed because the following two conditions are met: firstly, the time lapse between the the weaving machine stopping as a result of a warp break and then restarting is longer than the time required to make the join; and secondly, the above-mentioned drop wire 4A, which is suspended from the repaired warp thread 14A, is no longer in contact with the corresponding electrode 36. It is also self-evident that the automatic start is can be carried out either after making the join 37 or after making the join 39.
  • the clips 22, 23 and 24 can also be controlled in an appropriate manner, and may or may not form part of the unit 28.
  • mechanism 17 which operates on the warp sheet in order to separate the second thread end 18 need not necessarily consist of a rotating comb-shaped mechanism.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)

Claims (15)

1. Ein Verfahren zum Beheben eines gebrochenen Kettfadens auf Webmaschinen, insbesondere zum Beheben eines gebrochenen Kettfadens (14) zwischen dem Kettbaum (1) und dem Kettfadenwächter (3), gekennzeichnet dadurch, daß es sich im wesentlichen zusammensetzt aus dem Anknüpfen des ersten Fadenendes (15) des gebrochenen Kettfadens (14), das mit dem Gewebe (8) verbunden ist, an einen Faden (16) von einem getrennten Fadenvorrat (11); dem Wiederanlaufen der Webmaschine; dem Arbeiten an den Kettfäden (2) neben dem vorgenannten Faden (16) von einem getrennten Fadenvorrat mit Hilfe eines Mechanismus (17), der an der Kettebene arbeiten kann, um ein Fadenende von der Kettebene (2) zu entfernen und zu ermitteln, ob das mit dem Kettbaum (1) verbundene zweite Fadenende (18) von der Kettebene entfernt wurde; und, wenn das erwähnte zweite Fadenende (18) von dem erwähnten Mechanismus (17) ermittelt wurde, dem Anknüpfen des zweiten Fadenendes an den erwähnten Faden (16) von einem Fadenvorrat (11), wonach das Weben vom Kettbaum (1) fortgesetzt werden kann.
2. Das Verfahren gemäß Anspruch 1, gekennzeichnet dadurch, daß, falls das zweite Fadenende (18) von dem oben erwähnten Mechanismus (17) nicht innerhalb eines bestimmten Zeitraums ermittelt wird, der benötigte Kettfaden (14A) weiterhin von dem getrennten Fadenvorrat (11) genommen wird, während der Mechanismus (17) deaktiviert ist.
3. Das Verfahren gemäß Anspruch 1, gekennzeichnet dadurch, daß die Webmaschine automatisch wiederanlaufen kann, nachdem eines der Fadenenden (15, 18) an den Faden (16) von dem getrennten Fadenvorrat (11) angeknüpft wurde, wenn folgende zwei Bedingungen erfüllt sind: erstens, der Zeitraum zwischen dem Anhalten der Webmaschine infolge eines Kettfadenbruches und dem Wiederanlaufen ist länger als die für die entsprechende Verbindung (37, 39) benötigte Zeit und zweitens, die von dem behobenen Kettfaden (14, 14A) suspendierte Lamelle (4A) ist nicht mehr in Kontakt mit ihrer Elektrode (36).
4. Das Verfahren gemäß Anspruch 1, gekennzeichnet dadurch, daß die Webmaschine automatisch wiederanläuft, nachdem die Verbindung (37, 39) zwischen einem der Fadenenden (15, 18) und dem Faden (16) von dem getrennten Fadenvorrat (11) gemacht wurde, wenn folgende zwei Bedingungen erfüllt sind: erstens, ein Mechanismus (12) hat die Verbindung (37, 39) zwischen dem entsprechenden Fadenende (15, 18) und dem oben erwähnten Faden (16) ausgeführt; und zweitens, die von dem entsprechenden Kettfaden (14, 14a) suspendierte Lamelle (4a) ist von ihrer Elektrode (36) getrennt.
5. Das Verfahren gemäß anspruch 3 oder 4, gekennzeichnet dadurch, daß die von dem entsprechenden Kettfaden (14, 14a) suspendierte Lamelle (4a) von ihrer Elektrode (36) entfernt gehalten wird, indem der erwähnte Kettfaden (14, 14a) während und nach der Behebung gespannt bleibt.
6. Das Verfahren gemäß einem der vorgenannten Ansprüche, gekennzeichnet dadurch, daß das erste Fadenende (15) des mit dem Gewebe (8) verbundenen gebrochenen Kettfadens (14) und der Faden (16) von dem getrennten Fadenvorrat (11) angeknüpft werden, während sie ausgerichtet und gespannt gehalten werden.
7. Das Verfahren gemäß einem der vorgenannten Ansprüche, gekennzeichnet dadurch, daß das zweite, mit dem Kettbaum (1) verbundene Fadenende (18) und der Faden (16) von dem getrennten Fadenvorrat (11), der bereits an das erste Fadenende (15) angeknüpft ist, angeknüpft werden, während sie weitgehend auf derselben Ebene wie die Kettebene (2) sind und gespannt gehalten werden.
8. Eine Vorrichtung zur Behebung eines gebrochenen Kettfadens auf Webmaschinen, bestehend aus einem Mechanismus (17), der ein Fadenende von der Kettebene (2) entfernen kann, gekennzeichnet dadurch, daß sie sich ferner zusammensetzt aus einem getrennten Fadenvorrat (11); einem Mechanismus (12) zum Anknüpfen des ersten Fadenendes (15), das von einem Bruch (13) in der Kette (2) einer Webmaschine herrührt und das noch mit dem Gewebe (8) verbunden ist, an den Faden (16) von dem getrennten Fadenvorrat (11); einem Detektor (19), der mit dem Mechanismus (17) zum Entfernen eines Fadenendes von der Kettebene (2) zusammenarbeitet und ermittelt, ob ein mit dem Kettbaum (1) verbundenes Fadenende (18) von der Kettebene (2) entfernt wurde oder nicht; einem Mechanismus (12) zum Anknüpfen eines zweiten von der Kettebene (2) entfernten Fadenendes (18) an den mit dem ersten Fadenende (15) verbundenen Faden (16); und einer Steuereinheit (20), die die oben erwähnte Vorrichtung (10) nach einem Kettfadenbruch entsprechend aktiviert, wobei der Mechanismus (17) zum Entfernen eines Fadenendes von der Kettebene (2) an der Kettebene (2) neben dem Vorrat des oben erwähnten Fadens (16) arbeitet.
9. Die Vorrichtung gemäß Anspruch 8, gekennzeichnet dadurch, daß der Mechanismus (17) zum Entfernen eines Fadenendes von der Kettebene (2) aus einem drehenden, kammförmigen Mechanismus besteht, der von einer mit radialen Fortsätzen (27) versehenen Welle (26) gebildet wird und der an der Kettebene (2) einer Webmaschine arbeiten kann.
10. Die Vorrichtung gemäß Anspruch 9, gekennzeichnet dadurch, daß der drehende, kammförmige Mechanismus (17) aus einer Welle (26) besteht, die mit Bürstenhaaren versehen ist.
11. Die Vorrichtung gemäß Anspruch 8, 9 oder 10, gekennzeichnet dadurch, daß der getrennte Fadenvorrat (11) aus einer Spule besteht.
12. Die Vorrichtung gemäß Anspruch 9 oder 10, gekennzeichnet dadurch, daß sich der drehende, kammförmige Mechanismus (17) über die gesamte Webbreite einer Webmaschine erstreckt.
13. Die Vorrichtung gemäß Anspruch 9 oder 10, gekennzeichnet dadurch, daß der drehende, kammförmige Mechanismus (17) eine kleine Axiallänge hat, während eine Positioniervorrichtung (40) vorgesehen ist, die es diesem Mechanismus (17) erlaubt, sich quer über die Webbreite zu bewegen.
14. Die Vorrichtung gemäß Anspruch 12 oder 13, gekennzeichnet dadurch, daß der drehende, kammförmige Mechanismus (17) von einem oder mehreren Pneumatikzylindern (30) suspendiert ist und durch die Bewegung dieser Zylinder zur Kettebene (2) einer Webmaschine gebracht werden kann.
15. Die Vorrichtung gemäß Anspruch 12 oder 13, gekennzeichnet dadurch, daß sie mit einem Motor (31) ausgerüstet ist, der mittels einer Überbringung (32) mit dem kammförmigen Mechanismus (17) verbunden ist.
EP19880202070 1987-10-09 1988-09-23 Verfahren zum Wiederherstellen eines gebrochenen Kettenfadens an einer Webmaschine und Vorrichtung zur Durchführung dieses Verfahrens Expired EP0311168B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8701155A BE1000991A3 (nl) 1987-10-09 1987-10-09 Werkwijze voor het herstellen van een gebroken kettingdraad en weefmachine die deze werkwijze toepast.
BE8701155 1987-10-09

Publications (2)

Publication Number Publication Date
EP0311168A1 EP0311168A1 (de) 1989-04-12
EP0311168B1 true EP0311168B1 (de) 1991-09-04

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Application Number Title Priority Date Filing Date
EP19880202070 Expired EP0311168B1 (de) 1987-10-09 1988-09-23 Verfahren zum Wiederherstellen eines gebrochenen Kettenfadens an einer Webmaschine und Vorrichtung zur Durchführung dieses Verfahrens

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EP (1) EP0311168B1 (de)
JP (1) JPH01124658A (de)
BE (1) BE1000991A3 (de)
DE (1) DE3864644D1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH276690A (fr) * 1947-06-17 1951-07-31 Koninkl Tricotfabriek G J Will Dispositif d'arrêt d'une machine à travailler une nappe de fils.
DE1535901C3 (de) * 1965-08-26 1978-10-05 Reiners, Walter, Dr.-Ing., 4050 Moenchengladbach Verfahren und Vorrichtung zum Verbinden der an den Fadenspannern und Ablaufspulen eines Spulengatters bereitliegenden Fäden

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Publication number Publication date
DE3864644D1 (de) 1991-10-10
EP0311168A1 (de) 1989-04-12
JPH01124658A (ja) 1989-05-17
BE1000991A3 (nl) 1989-05-30

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