EP0406128A1 - Dispositif d'alimentation en fil de trame pour machine à tisser avec insertion pneumatique - Google Patents

Dispositif d'alimentation en fil de trame pour machine à tisser avec insertion pneumatique Download PDF

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Publication number
EP0406128A1
EP0406128A1 EP90420279A EP90420279A EP0406128A1 EP 0406128 A1 EP0406128 A1 EP 0406128A1 EP 90420279 A EP90420279 A EP 90420279A EP 90420279 A EP90420279 A EP 90420279A EP 0406128 A1 EP0406128 A1 EP 0406128A1
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EP
European Patent Office
Prior art keywords
nozzle
weft
weft thread
nozzles
launching
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Withdrawn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
EP90420279A
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German (de)
English (en)
French (fr)
Inventor
Roger Fourneaux
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.)
Saurer Diederichs SA
Original Assignee
Saurer Diederichs SA
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 Saurer Diederichs SA filed Critical Saurer Diederichs SA
Publication of EP0406128A1 publication Critical patent/EP0406128A1/fr
Withdrawn legal-status Critical Current

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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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means

Definitions

  • the present invention relates to a weft feed device for a shuttleless weaving machine with pneumatic insertion. More particularly, this invention relates to a device constituting a double weft feed system, so that, when a fault in the weft thread is detected on one of the feed systems, then in progress in use, it is automatically switched to another supply system whose weft thread is kept on standby.
  • this feeding device is in particular intended for a weaving machine provided with means allowing a specific detection of faults in the weft feeding, for example means ensuring this detection in connection with a sequence of "unweaving" as described in a previous French patent application No. 89 01918 filed on February 7, 1989 in the name of the Applicant.
  • European patent application No. 0 195 469 indicates detectors placed in the path of the weft thread, in each of the two supply systems.
  • the detectors monitor the state of the weft thread and, if a fault is detected, they control the switching to the other supply system, on standby, via a control unit.
  • this document does not indicate any concrete solution for the passage from one weft thread to another, in the case of a weaving machine with pneumatic insertion of the weft.
  • European patent application No. 0 291 486 describes a double weft feed system, intended for pneumatic insertion and comprising, on the same side of the weaving machine: a first pre-deliverer associated with a first nozzle, for the weft thread coming from a first supply coil, and - A second pre-deliverer associated with a second nozzle, for the weft thread coming from a second supply coil.
  • the weaving machine here comprises a mobile launch nozzle with the comb, and the problem posed when switching from one supply system to another is to manage to get into the nozzle mobile launch, the weft thread previously remained on hold. Indeed, there is already a general difficulty in introducing the free end of a wire at the inlet of a suction and blowing nozzle, this for pneumatic reasons, a harmful phenomenon of discharge which can occur at the nozzle entrance. In addition, in the particular configuration with three nozzles considered here, the axes of the first nozzle and of the second nozzle form an angle with the axis of the launch nozzle, and these first and second nozzles create diverging air jets. . Finally, there may be an imprecision of the stop position of the mobile launch nozzle, position where this nozzle must be brought when changing the weft thread.
  • This arrangement remains mechanically complicated, in that it requires mobile mounting of the first and second nozzles, and control means moving each of these nozzles in a rotational or translational movement.
  • the present invention aims to eliminate these drawbacks, by providing a new and simplified configuration, allowing entirely fixed mounting of the first and second nozzles, and reducing to the minimum the mobile elements necessary for the safe supply of one or other of the weft threads at the entrance of the mobile launch nozzle.
  • the invention essentially relates to a weft feed device for weaving machine without shuttle with pneumatic insertion, the device constituting a double feed system such that, when a fault in the weft thread is detected on one of the feed systems, it automatically switches to the other feed system whose weft thread is kept on standby, and this device comprising, on the same side of the weave, at least a first pre-feeder associated with a first nozzle, for the weft thread coming from a first supply spool and at least a second pre-deliverer associated with a second nozzle, for the weft thread coming from a second nozzle supply, each of these two nozzles being able to direct the corresponding weft thread towards a launching nozzle movable with the comb of the weaving machine, for the insertion of this weft thread, the device being characterized in that the first and second aforesaid nozzles are nozzles mounted fixed on the side of the weaving machine, and in what is provided at least one movable introduction
  • the invention makes it possible to have, in the weft yarn supply device, two fixed nozzles and a single mobile means ensuring the safe introduction of one or the other of the weft yarns into the nozzle. launch.
  • the overall configuration of the supply device thus remains particularly simple, while perfectly ensuring the desired functions: - the mobile means, now a weft thread on hold, can be put into action automatically following the detection of a defect, by being advanced towards the launching nozzle to introduce the thread and allow immediate weaving to continue with this thread; - After the mobile introduction means have retreated, the free end of the unused weft thread can be placed manually, in "masked time", on this mobile means.
  • the movable introduction means is constituted by a jack, having a fixed body and a movable rod in the direction of the launching nozzle, the end of the movable rod facing this nozzle. launching being provided with a member for gripping and holding the end of the weft thread put on hold.
  • the wire gripping and holding member provided towards the end of the movable rod of the jack, is a vacuum cleaner supplied with pneumatic fluid.
  • the presence of the vacuum cleaner facilitates the manual positioning of the end of the wire on said member, and ensures that this end is held in place as long as the weft thread remains on standby (if this vacuum cleaner is permanently powered ).
  • the means mobile introduction such as cylinder
  • the mobile introduction means such as a jack
  • This simplest arrangement corresponds to the organs necessary for the insertion of a single weft thread, in particular for weaving of a single color, with the possibility of immediate repair thanks to the thread of the same kind and of the same color held in reserve.
  • the weaving machine comprises two fixed nozzles, associated respectively with the two weft threads, and two corresponding mobile launching nozzles, arranged parallel to one another; for the implementation of the present invention, it suffices to have a third fixed nozzle, delivering a weft thread identical to the previous two, and the aforementioned mobile introduction means is provided for the introduction of this last thread into the either of the two launch nozzles.
  • the mobile introduction means keeping the weft thread on standby, is displaceable not only along the direction of the axes of the two launching nozzles, but also perpendicular to these axes, so as to bring said mobile means of introduction of one or other of the two launch nozzles onto the axis.
  • the same members thus ensure immediate troubleshooting of the supply of one or the other of the two weft threads used by the mixer.
  • the present invention is also applicable to a weaving machine with two or more colors, therefore to machines intended for the insertion of at least two threads of different wefts.
  • a two-color machine it is necessary to double not only the fixed nozzles and the mobile launch nozzles, but also the entire troubleshooting system: in other words, the feed device according to the In this case, the invention includes, for each fixed nozzle - launch nozzle subassembly associated with a specific color, another fixed nozzle and a mobile means for introducing a weft thread in reserve of this color.
  • FIG. 1 shows, very schematically, a shuttleless weaving machine with pneumatic insertion of the weft yarn 1 into the fabric in formation 2, from a fixed weft reserve situated on one side of the fabric 2.
  • the weft thread 1 assumed during weaving comes from a supply spool 3, placed on one side of the weaving machine, and it first arrives at a pre-deliverer 4 which measures corresponding lengths of thread to a pick and which releases the wire in successive lengths each corresponding to a pick.
  • the weft thread 1 then passes through a fixed nozzle 5, then through a launching nozzle 6 mobile with the comb (not shown), the fixed nozzles 5 and mobile 6 being supplied with compressed air to give the wire 1 the initial acceleration necessary for its insertion.
  • the weft thread 1 In crossing the "crowd" formed by the warp threads, the weft thread 1 is guided inside an insertion channel, and its movement is maintained by relay nozzles not shown, distributed over the width of fabric 2 and supplied sequentially with compressed air. Once inserted, each pick is separated from the rest of the weft thread 1 by a cutting means 7 placed at the edge of the fabric 2 on the side of the mobile launch nozzle 6, after which the next pick can be inserted in the same way .
  • Optical control means 8 of the "weft breaker" type disposed towards the edge of the fabric 2 remote from the launching nozzle 6, ensure the detection of the actual arrival of the weft thread 1 up to this edge of the fabric 2
  • These control means 8 emit signals directed to processing means 9, which are themselves connected to a central unit 10 for controlling the weaving machine.
  • this weaving machine is equipped with additional supply means making it possible to maintain a second weft thread 11 on standby.
  • These means include a second supply reel 12, a second pre-delivery meter 13 and a second fixed nozzle 14, similar to those previously described and located on the same side of the weaving machine.
  • Switching means 15 are provided for controlling, if necessary, the passage from the first supply means 3,4,5 to the other supply means 12,13,14, or vice versa, in particular for continuing weaving with the weft thread. 11 remained on standby, when the weft thread 1 previously used is broken, these switching means being themselves under the control of the central unit 10.
  • the mobile launch nozzle 6 is common to the two supply systems, each of the fixed nozzles 5 and 14 being able to direct the corresponding weft thread 1 or 11 towards this common mobile nozzle.
  • the respective axes 16 and 17 of the two fixed nozzles 5 and 14 converge symmetrically towards the inlet of the launching nozzle 6, assumed to be stopped in a predetermined position, and these two axes 16 and 17 form a certain acute angle A with the axis 18 of the launching nozzle 6.
  • the weaving machine is further provided with means 19 provided for the extraction of waste from a broken or defective weft thread.
  • These are in particular pneumatic means displaceable over the entire width of the fabric 2, as described in a previous French patent application No. 88 07257 filed on May 25, 1988 in the name of the Applicant.
  • These means 19 fulfill a so-called "untwisting" function, in association with a blowing sequence of the relay nozzles.
  • the supply device comprises, according to the invention, a mobile means designated as a whole by 20, and arranged as follows the axis 18 of the launching nozzle 6 put in its stopped position, as shown in FIG. 2.
  • the mobile introduction means 20 is disposed between the two fixed nozzles 5 and 14, along the bisector of the angle 2A formed by the respective axes 16 and 17 of these two fixed nozzles 5 and 14.
  • the movable introduction means 20 is produced in the form of a pneumatic cylinder, with a fixed body 21 and with a piston rod 22, movable along the axis 18, the external end of the rod 22 being turned towards the launch nozzle 6.
  • This end of the rod 22 is provided with a member 23 for gripping and holding the weft thread 11 put on hold.
  • the double-acting pneumatic cylinder 20 has two internal chambers connected by respective conduits 24 and 25 to a supply and control unit 26.
  • the block 26 is further connected, by a flexible conduit 27, to the member 23 for gripping and holding the wire, produced here in the form of a small vacuum cleaner.
  • FIGS 3 to 6 in which the previously described pneumatic supply system is not indicated for the sake of clarity, illustrate the operation of the device:
  • FIG. 3 shows the device in its normal position, during weaving carried out by means of the weft thread 1 supplied by the spool 3 and by the pre-deliverer 4.
  • the thread 1 successively passes through the fixed nozzle 5 and the launching nozzle 6.
  • the launching nozzle 6 is then put into action to suck the end of the weft thread 11 retained until then by the vacuum cleaner 23, this phase being illustrated in FIG. 5.
  • Figure 7 shows schematically a weft feed device, installed on a weaving machine with weft mixer, comprising a first fixed nozzle 5 ′ associated with a first mobile launch nozzle 6 ′, for the insertion of a first weft thread 1 ′, and a second fixed nozzle 5 ⁇ associated with a second launching nozzle 6 ⁇ , parallel to the first 6 ′, for the insertion of a second weft thread 1 ⁇ .
  • the two weft threads 1 ′ and 1 ⁇ are identical, and the machine is supplied alternately with these two threads 1 ′ and 1 ⁇ .
  • the device comprises a single set of troubleshooting, comprising a third fixed nozzle 14 and a single movable introduction means 20 such as a jack, with a member 23 for gripping and holding, for a reserve weft thread 11 identical to the two wires 1 ′ and 1 ⁇ .
  • the embodiment of the mobile introduction means 20 is similar to that of the previous embodiment, however, this mobile means 20 is further provided here displaceable transversely, as indicated by arrows 28 and 29, in order to be able to introduce the weft thread 11 in one or other of the two launch nozzles 6 ′ and 6 ⁇ .
  • the movable means 20 is moved in the direction of arrow 28 to introduce the weft thread 11 into the corresponding launching nozzle 6 ′
  • the movable means 20 is moved in the direction of arrow 29 to introduce the weft thread 11 into the corresponding launch nozzle 6 ⁇ .
  • FIG 8 is shown schematically a weft feed device for a two-color weaving machine.
  • a weft thread la of a first color is inserted here by passing through a first fixed nozzle 5a and a first movable launch nozzle 6a, while a weft thread 1b of another color is inserted through a second fixed nozzle 5b and a second mobile launch nozzle 6b, parallel to the first 6a.
  • a third fixed nozzle 14a and a first cylinder 20a with a gripping and holding member 23a, for a reserve weft thread 11a identical to the thread la
  • a fourth fixed nozzle 14b and a second cylinder 20b with a member 23b for gripping and holding, for another reserve weft thread 11b identical to the thread 1b.
  • the two jacks 20a and 20b are arranged parallel to each other, their respective rods 22a and 22b being movable in the direction of the corresponding fixed nozzles 6a and 6b to introduce there, if necessary, the reserve weft thread 11a or 11b.
  • FIG. 8 In the case of a weaving machine with several colors, the principle illustrated in FIG. 8 also applies, by providing as many jacks as weft yarns of different colors.
  • the invention is not limited to the sole embodiments of this weft feed device for weaving machines with pneumatic insertion which have been described above. above, as examples; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle.
  • the jack 20 equipped with the vacuum cleaner 23 or each jack thus equipped) being in particular replaceable by any mobile means of equivalent introduction. , capable of retaining the end of the weft yarn put on hold and of moving this end of the yarn towards the mobile launching nozzle.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP90420279A 1989-06-26 1990-06-11 Dispositif d'alimentation en fil de trame pour machine à tisser avec insertion pneumatique Withdrawn EP0406128A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8909269A FR2648831A1 (fr) 1989-06-26 1989-06-26 Dispositif d'alimentation en fil de trame pour machine a tisser avec insertion pneumatique
FR8909269 1989-06-26

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EP0406128A1 true EP0406128A1 (fr) 1991-01-02

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EP90420279A Withdrawn EP0406128A1 (fr) 1989-06-26 1990-06-11 Dispositif d'alimentation en fil de trame pour machine à tisser avec insertion pneumatique

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EP (1) EP0406128A1 (ja)
JP (1) JPH0333247A (ja)
FR (1) FR2648831A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003102282A1 (de) * 2002-05-31 2003-12-11 Lindauer Dornier Gesellschaft Mbh Verfahren zum gestreckthalten eines schussfadens und webmaschine zur verfahrensdurchführung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225669A1 (en) * 1985-12-13 1987-06-16 Picanol N.V. Device for supplying a weft thread to a main blower for weaving looms
EP0239137A1 (en) * 1986-02-21 1987-09-30 Picanol N.V. Device for the insertion of weft threads into the shed of air jet looms, and adjustable blowers used thereby
EP0282986A2 (en) * 1987-03-16 1988-09-21 Tsudakoma Corporation Yarn guide device
EP0291486A1 (en) * 1987-05-12 1988-11-17 Picanol N.V. Method for threading a pick insertion device on weaving machines and a device which uses this method
EP0293557A2 (de) * 1987-03-12 1988-12-07 Klöcker-Entwicklungs-GmbH Verfahren zum Spannen eines bei schützenlosen Webmaschinen eingetragenen Schussfadens
EP0195469B1 (en) * 1985-03-19 1989-03-29 Picanol N.V. Weaving machine with improved feed for the woof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195469B1 (en) * 1985-03-19 1989-03-29 Picanol N.V. Weaving machine with improved feed for the woof
EP0225669A1 (en) * 1985-12-13 1987-06-16 Picanol N.V. Device for supplying a weft thread to a main blower for weaving looms
EP0239137A1 (en) * 1986-02-21 1987-09-30 Picanol N.V. Device for the insertion of weft threads into the shed of air jet looms, and adjustable blowers used thereby
EP0293557A2 (de) * 1987-03-12 1988-12-07 Klöcker-Entwicklungs-GmbH Verfahren zum Spannen eines bei schützenlosen Webmaschinen eingetragenen Schussfadens
EP0282986A2 (en) * 1987-03-16 1988-09-21 Tsudakoma Corporation Yarn guide device
EP0291486A1 (en) * 1987-05-12 1988-11-17 Picanol N.V. Method for threading a pick insertion device on weaving machines and a device which uses this method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003102282A1 (de) * 2002-05-31 2003-12-11 Lindauer Dornier Gesellschaft Mbh Verfahren zum gestreckthalten eines schussfadens und webmaschine zur verfahrensdurchführung

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Publication number Publication date
JPH0333247A (ja) 1991-02-13
FR2648831A1 (fr) 1990-12-28

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