EP1367158A1 - Procédé et dispositif pour couper le fil de trame après l'insertion de la duite - Google Patents

Procédé et dispositif pour couper le fil de trame après l'insertion de la duite Download PDF

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Publication number
EP1367158A1
EP1367158A1 EP03009030A EP03009030A EP1367158A1 EP 1367158 A1 EP1367158 A1 EP 1367158A1 EP 03009030 A EP03009030 A EP 03009030A EP 03009030 A EP03009030 A EP 03009030A EP 1367158 A1 EP1367158 A1 EP 1367158A1
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EP
European Patent Office
Prior art keywords
weft
time
weft thread
thread
main nozzle
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Withdrawn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
EP03009030A
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German (de)
English (en)
Inventor
Stephan Arndt
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.)
Lindauer Dornier GmbH
Original Assignee
Lindauer Dornier GmbH
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 Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP1367158A1 publication Critical patent/EP1367158A1/fr
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/70—Devices for cutting weft threads
    • 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 invention relates to a method for the sequential entry of Weft threads in the loom of a weaving machine, where everyone from a supply drawn off weft thread is blown in and only after the insertion and is severed after the blade stop, the time of severing can be changed by signal-dependent activation of the separating device, according to the Preamble of claim 1.
  • the invention also relates to a device for consecutive entry of weft threads in the shed of a weaving machine, in particular for Implementation of the method according to the invention.
  • a method of this type is known and is apparent from EP 0 284 766 B1.
  • the weft thread is fed from a supply bobbin through a pre-winder to the main nozzle.
  • the weft thread is inserted into the weaving shed of the weaving machine by means of the air flow that passes through the main nozzle.
  • the reed is beaten and the weft thread is immediately separated from the supply.
  • a separating device is arranged between the main nozzle and the tissue edge adjacent to it.
  • the separating device is actuated by a separate, controllable drive which is independent of the main drive of the weaving machine.
  • the separating device can be driven, for example, by an electric stepper motor, which in turn receives its control signals from a computer.
  • the separating device can be operated under computer control at different points in time, or the actuation can also be canceled, so that the weft thread inserted is not separated.
  • Different web data are taken into account with the known device.
  • the optimal time for severing depends on the type of weft used, also on the weaving cycle, the weaving pattern, the operating state of the weaving machine and the course of the weaving in the shed. These influencing variables are entered into the computer as so-called weaving parameters, which form a control signal for driving the separating device and thereby determine the exact point in time at which the separating device is actuated. If a defective weft is detected by means of a weft monitor, the separating device can also be prevented from severing the weft so that the defective weft can be removed. The weft monitor required for this is provided on the fabric edge opposite the main nozzle.
  • Another known device for inserting a weft thread which in the EP 0 953 664 A1 is described and shown, relates to weaving machines, at to which the weft thread is brought into the Shed is entered.
  • the separation device for the Weft thread can also be controlled independently of the weaving machine drive and with connected to a holding device. Holding and separating device are in Dependence on a signal controlled according to the measured Thread tension is formed. A special sensor is provided for this.
  • the Separating device should therefore only be active when the holding force of the Weft has reached a certain value that is neither too high nor too low may be. This control is intended to compensate for the disadvantage that the Thread clamps of the rapier grippers differ depending on the type of weft thread are effective, which can result in thread losers and fabric defects.
  • the device according to EP 0 953 664 A1 therefore requires that an absolute Measured value of the tension in the weft thread is determined. Determination methods the mechanical tension of the weft thread during ongoing weaving operations already known. In view of the ever higher speeds of the weaving machines tensile stress measurement is becoming increasingly important because so that the mechanical properties of the weft yarn are largely exploited can be. However, it is relatively expensive, the tension of the To determine the weft exactly during operation.
  • the disadvantage is that the trigger time of the The separation device does not always correspond to the actual separation time. It so it happens that the time of separation from the desired theoretically set value deviates. That may be because the weft threads are arranged in different positions in the area of the separating device, corresponding to those arranged side by side and one above the other Main nozzles. Furthermore, the often very complicated thread guidance in the Area of the separating device to be the cause of the deviations mentioned. Further Causes can be due to the type of weft yarn and also because the Drive the separator electromechanical fluctuations or Speed fluctuations are subject. Furthermore, with the wear of the Separating scissors. These causes can arise in also change ongoing web operations and are subject to fluctuations.
  • the " weaving result” is primarily to be understood as the proper, ie above all even, formation of the fabric edges.
  • the person who operates the weaving machine has the option of setting the separating device of the weaving machine to a first value which, on the basis of theoretical considerations and practical preliminary tests, gives the best possible weaving result, that is, above all, a particularly uniform design the fabric edge should lead. If the result achieved in practice then shows that the first setting did not produce the desired result because the actual time of severing deviated from the theoretically intended time, then this time can be moved forward or backward for the following weft threads by the Isolating device is controlled with a changed signal that corresponds to the now desired time. The state of the tissue edge, which occurs after the signal change, will show whether the assumption made was correct.
  • the process can be repeated in several stages or carried out continuously until a fabric with a consistently regularly formed fabric edge and also otherwise improved weaving properties leaves the weaving machine. Since the continuous monitoring of the tissue edge is easily possible with optical measurement methods during operation, the process can run automatically. The time at which a first weft thread is separated from the supply can also be determined automatically and reliably using optical methods. For this purpose, it is sufficient to visually monitor an area between the separating device and the shed, through which the weft thread to be separated later passes.
  • the point in time of the separation is determined is determined by determining the time at which the mechanical Tensile stress in the weft changes suddenly as a result of the severing.
  • the Known methods for measuring the tension in the weft need here can only be used to the extent that it is relatively easy to grasp Time is to be recorded at which the pulling action of the by means of the reed the inserted weft thread stops and the one with the supply spool in The remaining part of the weft thread only under the influence of Holding air is available, which keeps the thread end in the main nozzle until the next Shot entry takes place. It is therefore not necessary to have an exact and complex Determine the absolute value of the tension.
  • the device achieving the aim of the invention, in particular for Implementation of the method described so far is also used for the sequential insertion of weft threads into the shed of one Air jet loom. It consists of a device with at least one Main nozzle, with a separator, which is a signal-controlled, from the drive of the Has loom independent drive, with a measuring device for Record the time at which the part of a Weft thread is separated from a supply and with a calculator that follows Provided in the monitoring devices and in the measuring device formed signals forms a corrected control signal and to the drive of the Dispenses separation device, such that the separation device in the or subsequent shooting operations are triggered at a different point in time.
  • An advantageous development of this device relates to Monitoring facilities for the condition of the tissue produced and consists in an edge detector that detects the condition on the opposite side of the main nozzle Tissue edge captured.
  • an optical measurement can be used, for example Edge detector easily determine if the tissue created is really with a evenly formed edge is provided. The result of this measurement gives the Edge detector then on to the computer, according to this measurement if necessary forms a corrected control signal and the control of the Separation device initiated at a different time.
  • the measuring device for detecting the weft thread separation is advantageous According to a further advantageous embodiment of a detector that the Time recorded at which the mechanical tension in the weft becomes Sequence of disconnection changes abruptly.
  • the one brought into the shed Weft is only separated when the reed stops brought and thus holds the weft.
  • One brought in like this Weft thread is subject to considerable tensile stress, but this suddenly is reduced as soon as the weft thread on the insertion side of the shed is separated.
  • the part of the The weft thread is then only under the influence of the holding air, which The thread end in the main nozzle holds until the next weft insertion occurs. It is coming So do not aim to determine the exact absolute value of the thread tension.
  • An advantageous location for the arrangement of the measuring device for detecting the Weft thread separation is the point immediately in front of the main nozzle, seen in Thread running direction. On the one hand, this point is still easily accessible for measurements, on the other hand, but close to the point of separation of the weft thread, so that here with good Measurement results and still structurally easy to do Installation conditions can be worked.
  • 1 denotes a coil on which the supply of the Weft is located. Seen in the direction of the weft 9, follow then the pre-winder 2, the main nozzle 3 and the separating device 4. This is driven by a drive from the central drive of the weaving machine is independent. In general it is an electric drive motor, which is controlled by a computer 6. At 8, the warp threads are too designating fabric 10, wherein the reed 7 for striking the new in the part 9a of the weft thread 9 inserted into the fabric to that already formed Tissue 10 serves. With 11 a monitoring device is designated, which is ongoing e.g. checked at least on the entry or extract side of the shed, such as uniformly the fabric edge opposite the main nozzle 3 is formed.
  • the measuring device is located between the pre-spooler 2 and the main nozzle 3 12, which is connected to the computer 6 by means of a signal line 13a.
  • Another Signal line 13b serves to receive signals from the monitoring device 11 go out, also to transfer to the computer 6.
  • the mechanical tension in the weft thread 9 measured continuously.
  • a measuring device works on the principle e.g. of a piezo element, a detailed description is not necessary because of such Measuring devices are familiar to the expert.
  • the Separating device 4 because these z. B. in the form of a rotating Knives or scissors are common, which consist of a stationary and a movably driven part can exist. The only thing that matters is that the Drive the scissors can be controlled at a precisely selectable time, so that the weft thread passing through is separated.
  • the principle of the invention is not based on the insertion of a single weft thread limited.
  • the device described can also be spatially in the usual way Main nozzles arranged side by side and one above the other in a multiple arrangement include so that different layers of wefts through the Separator are passed.
  • the weft thread 9 running out of the bobbin 1 is passed through the main nozzle 3 performed and by means of compressed air between the warp threads 8 of the shed until it touches the opposite edge of the fabric 10 comes out again.
  • the reed 7 becomes a stop in the shed brought and thus holds the inserted part 9a of the weft.
  • the separator 4 comes into operation because its drive 5 by a computer 6 present signal is driven. This process can also be done several times can be repeated without the signal 6 present on the computer being changed.
  • the monitoring device 11 detects e.g. at the main nozzle 3 opposite fabric edge constantly the state of the fabric edge formed. The result is that the fabric edge is too irregular or has other defects, so the monitoring device 11 on the Signal line 13b sends a signal to the computer 6.
  • the measuring device 12 now has the time for each separation process held on which the part 9a of the weft thread 9, ie inserted into the shed the inserted end from which the weft 9 has been severed.
  • the one in that Part 9a inserted in the shed is produced due to the different deflection points at Pass through the separating device and in particular after striking the Webblattes 7 a considerable tensile stress, which by means of the measuring device 12th is recorded.
  • this tensile stress becomes abrupt much less because the still connected to the coil 1 end of Weft 9, which is located in the main nozzle 3, then only from the Holding air is held until the next weft entry occurs.
  • This sudden Decrease in thread tension can be determined very well using measurement technology forms the basis for a correction signal by the computer 6 as required of the signal about the state of the tissue edge is formed. Due to the introduced signals and the available web data for the fabric to be manufactured a changed trigger signal is formed and output to the drive 5.
  • the Separator 4 is consequently the next time a registration Weft controlled at a different point in time. The process can be like this long repeat until the fabric edge on the exit side of the weft is consistently even.
  • the inventive method and the device are particularly valuable if several weft threads are inserted at the same time and separated together. There the cutting process is arranged above or next to each other It extends weft threads and runs at finite speed inevitable that the individual weft threads at different times from be separated from their stock. There must therefore be an average value for controlling the Separation device are sought, which is reached when the tissue edge becomes even and there are also otherwise satisfactory measurement results. This is with the measurement alone on a single weft using the to achieve the inventive method and the device.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP03009030A 2002-05-31 2003-04-17 Procédé et dispositif pour couper le fil de trame après l'insertion de la duite Withdrawn EP1367158A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10224079 2002-05-31
DE2002124079 DE10224079B3 (de) 2002-05-31 2002-05-31 Verfahren und Vorrichtung zum aufeinander folgenden Eintragen von Schussfäden in das Webfach einer Webmaschine

Publications (1)

Publication Number Publication Date
EP1367158A1 true EP1367158A1 (fr) 2003-12-03

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EP03009030A Withdrawn EP1367158A1 (fr) 2002-05-31 2003-04-17 Procédé et dispositif pour couper le fil de trame après l'insertion de la duite

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EP (1) EP1367158A1 (fr)
JP (1) JP3672915B2 (fr)
DE (1) DE10224079B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106592069A (zh) * 2016-12-30 2017-04-26 吴江市兴业纺织有限公司 一种喷气织机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284766A1 (fr) * 1987-03-09 1988-10-05 Picanol N.V. Procédé pour couper un fil de trame inséré et dispositif de coupage
EP0867543A2 (fr) * 1997-03-27 1998-09-30 Lindauer Dornier Gesellschaft M.B.H Procédé et dispositif pour la commande et le contrÔle du fonctionnement de ciseaux à fil actionnés par moteur électrique sur métiers à tisser
EP0953664A1 (fr) * 1998-04-28 1999-11-03 Sulzer Rüti Ag Dispositif pour couper un fil de trame à insérer et système pour insérer un fil de trame avec un tel dispositif
US6273150B1 (en) * 1997-12-11 2001-08-14 Picanol N.V. Method and apparatus to monitor filling insertion in a weaving machine, with detection of an exact time at which the filling is actually severed

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284766A1 (fr) * 1987-03-09 1988-10-05 Picanol N.V. Procédé pour couper un fil de trame inséré et dispositif de coupage
EP0867543A2 (fr) * 1997-03-27 1998-09-30 Lindauer Dornier Gesellschaft M.B.H Procédé et dispositif pour la commande et le contrÔle du fonctionnement de ciseaux à fil actionnés par moteur électrique sur métiers à tisser
US6273150B1 (en) * 1997-12-11 2001-08-14 Picanol N.V. Method and apparatus to monitor filling insertion in a weaving machine, with detection of an exact time at which the filling is actually severed
EP0953664A1 (fr) * 1998-04-28 1999-11-03 Sulzer Rüti Ag Dispositif pour couper un fil de trame à insérer et système pour insérer un fil de trame avec un tel dispositif

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106592069A (zh) * 2016-12-30 2017-04-26 吴江市兴业纺织有限公司 一种喷气织机
CN106592069B (zh) * 2016-12-30 2018-07-06 吴江市兴业纺织有限公司 一种喷气织机

Also Published As

Publication number Publication date
JP3672915B2 (ja) 2005-07-20
DE10224079B3 (de) 2004-03-25
JP2004003105A (ja) 2004-01-08

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