EP4367306A1 - Verfahren zum entfernen eines fehlerhaft eingetragenen schussfadens sowie luftduesenwebmaschine - Google Patents
Verfahren zum entfernen eines fehlerhaft eingetragenen schussfadens sowie luftduesenwebmaschineInfo
- Publication number
- EP4367306A1 EP4367306A1 EP22734547.7A EP22734547A EP4367306A1 EP 4367306 A1 EP4367306 A1 EP 4367306A1 EP 22734547 A EP22734547 A EP 22734547A EP 4367306 A1 EP4367306 A1 EP 4367306A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shed
- drive
- weft thread
- incorrectly inserted
- thread
- 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
Links
Classifications
-
- 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
-
- 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
Definitions
- the invention relates to a method for removing an incorrectly inserted weft thread in an air-jet loom and such an air-jet loom.
- EP 0310804 B1 discloses such a method and such an air-jet weaving machine, in which weft threads are inserted into this shed by means of a main blowing nozzle arranged on an insertion side of the weft thread and several relay nozzles arranged along a shed formed by warp threads.
- the shed which is defined by a lower shed and an upper shed by correspondingly deflected warp threads, is produced by means of a shedding device which is driven by a first drive.
- the shafts of the shedding device periodically shift the warp threads of the lower shed to the upper shed and vice versa after each weft insertion.
- the shed After a weft thread has been inserted, the shed is moved to a closed position and a reed driven by a second drive beats up the weft thread at the binding point, whereupon the inserted weft thread is severed from the weft thread supply provided on the insertion side by a separating device, in particular a cutting device.
- the first drive and the second drive are driven by a controller which ensures that the two drives always run in synchronism with one another.
- a thread monitor checks that the weft threads have been correctly inserted.
- a faultless weft insertion in which the weft thread passes the thread monitor, does not lead to an error signal.
- the thread monitor emits an error signal. That Error signal causes the controller to stop the weaving machine. Since stopping cannot take place immediately, the incorrectly inserted weft thread is still beaten up by the reed at the binding point and must therefore subsequently be detached from the binding point in order to be able to be removed.
- the controller controls the first and the second drive in the known method in such a way that on the one hand the shedding device moves the shed into an open position and - as a result of the synchronization and quite intentionally - on the other hand the reed is pivoted away from the binding point .
- the incorrectly inserted weft thread that is still protruding from the main blowing nozzle is lifted from the tying point at least on the insertion side, since the main blowing nozzle, as well as any fore-nozzle and relay nozzles that may be present, are arranged together with the reed on the sley and are therefore this can be pivoted away from the binding point.
- the incorrectly inserted weft thread can then be detached from the binding point over its entire length and transported together with a released part of the weft thread held ready on the entry side to the discharge side, where the end of the weft thread is stretched and held by a suction nozzle.
- This process is referred to as "blowing out" in the context of the present description.
- a control step follows to check whether the weft thread has actually been sucked off. To do this, the shed is closed and the reed is struck at the binding point. If the thread monitor then registers the presence of a weft thread, this means that the previously incorrectly inserted weft thread was not completely removed from the shed. In this case, this weft thread is removed manually when the shed is then open.
- the controller of the air-jet weaving machine cancels the synchronization between the first and the second drive when it receives an error signal from the thread monitor that detects a weft break and then controls the two drives independently of one another.
- the two drives are designed to be mechanically separate from one another, i.e. they are not mechanically coupled to one another at any time, but are electronically synchronized with one another in normal operation.
- the two drives are mechanically coupled to one another during normal operation and in this way synchronized with one another in normal operation, but can be decoupled from one another, e.g. by means of a correspondingly designed clutch that can be correspondingly controlled by the controller.
- the reed is pivoted away from the binding point by means of the control of the second drive - comparable to the known method for automatic weft break repair.
- the controller controls the second drive for this purpose independently of the first drive in order to bring the reed into a first pivoted position pivoted away from the binding point.
- the first drive is actuated by the controller independently of the second drive in such a way that the shed moves to a first open position with a smaller opening angle compared to during the normal, i.e continuous, weaving reached maximum opening angle is transferred.
- the opening angle is defined as the angle that is formed, starting from the binding point, between the lower shed and the upper shed.
- the relay nozzles which are arranged together with the reed on the sley, now dip to a lesser extent from below through the lower shed into the shed due to the design according to the invention, so that the relay nozzles hardly represent an obstacle for the weft thread to be removed and this can no longer get caught on the relay nozzles as often or not at all.
- This makes it possible for incorrectly inserted weft threads to be removed from the shed with a significantly higher success rate.
- This advantage results both in the stretching of the faulty inserted weft thread in the shed (by blowing out and/or suction) and in the mechanical removal of such a weft thread on the insertion side.
- both the shed opening and the reed position in relation to the shed are each freely adjustable, ie independently of one another. It is preferred that the two drives are each designed as individual drives, although these two individual drives are always decoupled, but synchronized with each other during the continuous weaving operation by means of the controller. If a weft break is detected, the reed is pivoted into a first pivoted position away from the binding point, as in the prior art, while the shedding device, driven by the first drive, transfers the shed into said first open position.
- the first open position is preferably, but not necessarily, the open position of the shed approached immediately after the synchronization of the two drives has been removed.
- the shed can initially also be moved to an intermediate position upstream, but this would not bring any advantage in most cases.
- the basic steps of - after the inventive transfer of the shed into the first open position - the subsequent blowing out and/or suction and/or mechanical removal of the incorrectly inserted weft thread, the cutting of this weft thread and its final removal are advantageously carried out according to the prior art, albeit particularly preferably if the synchronization of the two drives is still suspended.
- the first and the second drive are preferably not synchronized with one another until normal weaving operation is resumed by appropriate activation by the controller.
- the controller controls the first drive when the at least one thread monitor receives said error signal in such a way that the shed, after it has been transferred to the first open position, not only during the step of blowing out and/or sucking in and/or mechanically removing the incorrectly inserted weft thread in this first open position remains, but also during the cutting of the incorrectly inserted weft thread. Furthermore, it is advantageous if the shed also during the removal of the cut incorrectly inserted weft thread remains in the first open position. Furthermore, it is advantageous if the shed also remains in the first open position during a control step, preferably carried out with the thread monitor, for checking the successful removal of the incorrectly inserted weft thread.
- the shed remains in the first open position until the restart of the weaving machine is prepared and carried out with the first and second drives then being synchronized with one another again.
- the shed is moved into the first open position after the synchronization has been canceled and remains there during the entire process for repairing the weft breakage, possibly including a control step, until the weaving machine is started to start weaving operation.
- the controller controls the second drive when the said error signal of the at least one thread monitor is given such that the reed remains in this first pivoted position after being pivoted into the first pivoted position during blowing out and/or suction and/or mechanical removal.
- the first pivoting position is preferably as far away from the tying point as possible, so that the incorrectly inserted weft thread can be detached from the tying point and stretched by the flap nozzle and the relay nozzles arranged on the sley.
- the reed is then preferably transferred into a second pivoting position by controlling the sley by means of the second drive, in which the reed is close to the binding point, in order in this way to cut off the incorrectly inserted weft thread stretched in the shed in a controlled manner be able.
- the incorrectly inserted weft thread is preferably introduced into a weft thread cutter.
- the reed can be brought into the first pivoted position or, which is preferred, moved into a third pivoted position in which the reed is preferably closer to the binding point than in the first pivot position and further away from the binding point than in the second pivot position.
- Pivoting the sley with the reed into such a third pivoting position which is closer to the tying point than the first pivoting position, has the advantage that the reed has a shorter pivoting path to cover in this third pivoting position, starting from the second pivoting position, and thus the duration of the automated process for removing an incorrectly inserted weft thread is shortened, which in turn reduces the downtime of the loom after a weft break.
- the risk of the cut incorrectly inserted weft thread getting caught during suction is further minimized, since the relay nozzles protrude even less into the shed in the third pivoted position than in the first pivoted position of the reed.
- the first drive is particularly preferably controlled by the controller in such a way that the warp threads of the upper shed and the warp threads of the lower shed have an opening angle of less than 30°, preferably less than 15°, in the first open position of the shed preferably form less than 12°.
- These angular positions have proven to be advantageous for repairing a weft break that is significantly less susceptible and for protecting the warp threads tensioned during the repair of a weft break.
- the controller also particularly preferably controls the first drive in the event of an error signal from the at least one thread monitor in such a way that the warp threads of the upper shed and the warp threads of the lower shed have an opening angle of more than 4°, preferably more than 6°, in the first open position of the shed preferably form more than 7°.
- Another advantage of a relatively small opening angle of the shed are the lower distortions in the left and right temple area.
- the expanders serve to hold the fabric in place at its two edge areas running in the direction of the warp, in order to prevent it from contracting towards the center of the fabric due to mechanical stresses.
- the smaller the shed opening or the opening angle of the shed the lower the mechanical tension acting inwards on the fabric edges, since the thread tension is hardly increased with a small shed, which ultimately leads to a more even binding point line across the weaving width.
- the opening angle is between 7° and 12°.
- the controller preferably controls the first drive in such a way that the relay nozzles, measured from the lower edge of the lowermost blow opening of the relay nozzles, do not protrude more than 6 mm through the plane of the warp threads of the lower shed in the first open position of the shed in the weaving shed protrude.
- the term “lowermost blowing opening” of each relay nozzle should also be understood to mean the case in which one or more relay nozzles have only a single blowing opening.
- the aforementioned configuration has the advantage that the blowing openings (or the only blowing opening) only protrude to a small height into the shed and the relay nozzles therefore hardly represent an obstacle for the weft thread approaching from the insertion side.
- the invention also relates to a device according to the independent device claim with the corresponding device features which result directly from what has been said above. This also applies to the dependent device claims.
- Figure 1 shows an air jet weaving machine in schematic
- FIG. 2 shows a front view of a reed and pneumatic devices of the air-jet weaving machine
- FIG. 3 shows a side view of a reed in a first pivoting position and a shed, illustrated on the one hand with a first opening angle a and on the other hand with an opening angle a according to the prior art;
- FIG. 4 shows a side view of the reed of FIG. 3 in a second pivoted position
- FIG. 5 shows a side view of the reed of FIGS. 3 and 4 in a third pivoted position.
- FIG. 1 shows essential elements of an air-jet weaving machine 1 in a very schematic side view.
- Two shafts 23 arranged one behind the other of a shedding device 22 receive warp threads 2 in a known manner, with the two shafts 23 being moved up and down in push-pull by means of a first drive 20 .
- the warp threads 2 form a lower shed 62 and an upper shed 64, which together create a shed 60, which opens and closes due to the warp threads 2 constantly changing from the lower shed 62 to the upper shed 64 and vice versa.
- a weft thread 3 is shot through the shed 60 in the weft direction SR, which runs orthogonally to the warp direction KR (see Figure 2), whereupon the shed 60 is closed by means of the shedding device 22 and a reed 32 is attached to the binding point 66 of the Goods 67 strikes.
- the reed 32 is in this case arranged on a sley 36 which is periodically pivoted towards and away from the tying point 66 by a second drive 30 during normal weaving operation.
- the first drive 20 and the second drive 30 are both controlled by a controller 50 via corresponding signal lines 51 , 52 . It is particularly preferred that both drives 20, 30 are designed as individual drives which the controller 50 is able to control separately from one another. In normal weaving operation, the two drives 20, 30 are controlled in such a way that they run synchronously with one another in order to ensure the repeated, precise movement sequence of shed formation and reed beat-up required for a weaving cycle.
- the reed 32 is arranged on the sley 36 driven by the second drive 30, in the present case only some of its reed teeth 33 are shown on the outer sides.
- a plurality of relay nozzles 40 spaced apart in the weft direction SR are also arranged on the sley 36, each on a flute 38, the one or more blowing openings 42 of which are directed towards a channel 34 running in the weft direction SR, which is formed by indentations in the reed teeth 33 (see Figures 3-5).
- the at least one main blowing nozzle 6 inserts a weft thread 3 into the shed 60 on the insertion side 8, which is then transported through the shed 60 by the relay nozzles 40 in the channel 34 and sucked in by a suction device 45 arranged on the discharge side 9.
- the shed 60 is then closed by the shedding device 22 , the inserted weft thread 3 is beaten up by the reed 32 at the binding point 66 and subsequently cut off by a cutting device 68 on the insertion side 8 .
- a thread monitor 48 which in this case consists of an optical transmitter and an optical receiver, checks that each weft thread 3 has been inserted correctly.
- the thread monitor 48 gives this only an error signal if a weft thread 3 is inserted incorrectly and does not reach the thread monitor 48.
- This scenario is also called gunshot fracture.
- the present invention relates to an improved method and apparatus for automatic shot break repair. Said error signal from the thread monitor 48 causes the controller 50 connected to the thread monitor 48 to first stop the normal weaving operation of the air-jet weaving machine 1 . According to the invention, the synchronization between the first and the second drive 20, 30 is then canceled by the controller 50.
- the controller 50 now controls the second drive 30 in such a way that the reed 32 assumes a first pivoted position pivoted away from the binding point 66, see FIG. the erroneously inserted weft thread 3 is pushed in the direction of the binding point 66. If the at least one main blowing nozzle 6 is arranged on the sley 36, as is customary, and is gifted with it, pivoting the reed 32 into the first pivoting position can detach the incorrectly inserted weft thread 3 from the tying point 66, at least in the area of the main blowing nozzle 6 will.
- controller 50 controls first drive 20 in such a way that shedding device 22 moves shed 60 into a first open position, wherein the opening angle a of this first open position—starting from binding point 66 and measured between lower shed 62 and upper shed 64—is smaller than the maximum opening angle a of the open position reached during continuous weaving operation, see also Figure 3.
- the transfer of the reed 32 into the first pivoted position in conjunction with the shed 60 brought into a first open position by the shedding device 22 makes it possible opened up that the incorrectly inserted weft thread 3 can ultimately be removed from the shed 60.
- the basically known step of blowing out the incorrectly inserted weft thread is then carried out in the air jet weaving machine 1 shown in the figures.
- the term "blowing out” means that the weft thread 3 still connected to the weft thread supply on the insertion side 8 is transported in the direction of the discharge side 9 and there by activating the at least one main blowing nozzle 6 and the relay nozzles 40 (and possibly one or more pre-nozzles). is stretched by the suction device 45. So that the weft thread end can reach the suction device 45, a piece of the weft thread is released from the weft thread store. In the aforementioned stretched position, the incorrectly inserted weft thread 3 can be cut by the cutting device 68 on the insertion side 8 and finally removed for good. This is expediently done by suction using the suction device 45 on the discharge side 9.
- the incorrectly inserted weft thread 3 is finally cut off by means of the cutting device 68 and finally removed.
- the shed 60 formed by the lower shed 62 and the upper shed 64 in its first open position assumes an opening angle a of approximately 10°, with the opening angle a preferably being between 7° and 12° .
- the opening angle ⁇ is between the lower compartment 62' and the upper compartment 64' (see FIG. 3) when the shed 60 is in the maximum open position during normal weaving operation at over 30°.
- the small opening angle a offers the particular advantage that the warp threads 2 deflected by the shafts 23 are only very slightly stretched, at least during the phase of blowing out and/or sucking in and/or mechanically removing the incorrectly inserted weft thread 3 .
- the relay nozzles 40 protrude only slightly through the lower shed 62 into the shed 60 when the shed 60 is in the first open position.
- the wrongly inserted weft thread 3 - regardless of whether it is stretched towards the discharge side 9 or pulled out on the insertion side 8 - can hardly be caught on the relay nozzles 40, which means that a greater success rate can be achieved in automatic weft breakage repair.
- FIG. 3 also indicates that the lower edge of a blow opening 42—shown here only as a single present—which is arranged at the free end of each relay nozzle 40 protrudes only slightly through the lower compartment 62, preferably no more than 6 mm. This means that the erroneously inserted weft thread 3 can still be blown out, but with minimal freedom of movement on its way to the discharge side 9 or to the insertion side 8.
- the reed 32 is pivoted into a second pivoting position near the binding point 66 by activation of the second drive 30 by means of the controller 50, in order to then carry out the cutting of the incorrectly inserted weft thread 3. Due to the canceled synchronization between the two drives 20, 30, the shed can remain in said first open position, so that the warp threads 2 continue to be stretched only slightly.
- the reed 32 has been transferred to a third pivoted position, in which the reed 32 is located between the first and second pivoted positions, so that the reed 32 only has to pivot a relatively short distance, starting from the second pivoted position.
- the shed 60 on the other hand, can remain in the said advantageous first open position with the opening angle ⁇ .
- the incorrectly inserted and meanwhile cut weft thread 3 is preferably removed, preferably by suction using the suction device 45.
- the risk of the cut weft thread 3 getting caught during suction is further minimized by this third pivoting position, since here the relay nozzles 40 protrude even less into the lower compartment 62 in comparison to the first pivoting position.
- the transfer of the reed 32 into the described third pivoted position also saves time in the automatic process of repairing the weft breakage and reduces downtimes of the weaving machine.
- a control step can follow in which it is checked whether said weft thread 3 has actually been finally removed.
- the shed 60 remains in its previously approached open position with its relatively small opening angle, while the reed 32 is moved close to the binding point 66 (comparable to the position of the shed 60 and the reed 32 according to FIG. 4). If the thread monitor 48 then still registers the presence of a weft thread 3 and emits a corresponding signal (in this case signaling the presence of a weft thread), this means that the previously incorrectly inserted weft thread 3 was not completely removed from the shed 60.
- this weft thread 3 is preferably removed manually when the shed 60 is then open.
- the shed 60 is preferably still in the first open position with opening angle ⁇ even until the preparation for the renewed start-up of the air-jet weaving machine 1, in which the first drive 20 and the second drive 30 then again run in synchronized operation through activation by the controller 50.
- the reed 32 is advantageously moved into a position similar to the third pivoting position described in FIG Effect of saving time in automatic shot breakage repair and the associated reduction in downtime.
- controller 50 is set up in such a way that it preferably activates first drive 20 in the event of an error signal from the at least one thread monitor 48 in such a way that shed 60, after it has been moved into the first open position, remains in this position until continuous weaving operation starts again can remain open for the first time. Only then are the reed 32 and/or the shafts 23 of the shedding device 22 brought into the position necessary for continuous weaving with the associated synchronization of shedding device 22 and reed 32, after which weaving can be continued.
- the mentioned long stay in the first open position with the reduced opening angle has the advantage that the warp threads 2 are stretched only slightly during the entire process of removing the weft thread 3 .
- Further advantages of the invention due to the relatively small and preferably constant opening angle of the shed are less distortion in the spreader area and a uniform binding point. Due to the free, mutually independent adjustability of the opening angle of the shed on the one hand and the position of the reed in With regard to the open shed, on the other hand, a higher success rate can be achieved in automatic error correction.
- the first open position of the shed 60 does not have to be approached immediately after the machine stops; one or more intermediate positions are also possible beforehand. It is also possible that after the erroneously inserted weft thread 3 has been blown out and/or sucked in and/or mechanically removed, the shed 60 is moved into one or - then one after the other - several other open positions, which preferably also have a relatively small opening angle of less than 30° ° have. Additional thread monitors can also be arranged at other positions in relation to the shed 60; continue to be able to the thread monitor
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021207297.6A DE102021207297B3 (de) | 2021-07-09 | 2021-07-09 | Verfahren zum Entfernen eines fehlerhaft eingetragenen Schussfadens sowie Luftdüsenwebmaschine |
| PCT/EP2022/065894 WO2023280510A1 (de) | 2021-07-09 | 2022-06-10 | Verfahren zum entfernen eines fehlerhaft eingetragenen schussfadens sowie luftduesenwebmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4367306A1 true EP4367306A1 (de) | 2024-05-15 |
| EP4367306B1 EP4367306B1 (de) | 2025-07-30 |
Family
ID=80351752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22734547.7A Active EP4367306B1 (de) | 2021-07-09 | 2022-06-10 | Verfahren zum entfernen eines fehlerhaft eingetragenen schussfadens sowie luftduesenwebmaschine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4367306B1 (de) |
| JP (1) | JP2024524560A (de) |
| CN (1) | CN117716079A (de) |
| DE (1) | DE102021207297B3 (de) |
| WO (1) | WO2023280510A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0207470B1 (de) * | 1985-06-29 | 1992-05-13 | Nissan Motor Co., Ltd. | Verfahren und Vorrichtung zum Entfernen eines Schussfehlers |
| DE3730480A1 (de) | 1987-09-11 | 1989-03-30 | Picanol Nv | Verfahren zum entfernen eines fehlerhaft eingebrachten schussfadens an einer luftwebmaschine |
| JP2002069801A (ja) * | 2000-09-05 | 2002-03-08 | Tsudakoma Corp | 不良糸除去における緯糸切断方法 |
| FR2908426B1 (fr) * | 2006-11-15 | 2009-05-29 | Schonherr Textilmaschb Gmbh | Dispositif d'insertion de trame,metier a tisser pour tapis equipe d'un tel dispositif et procede de traitement d'un defaut d'insertion de trame dans un tel metier |
| DE102007020907B4 (de) * | 2007-04-26 | 2020-04-23 | Picanol | Verfahren und Vorrichtung zum Anfahren einer Webvorrichtung |
| DE102007043142B4 (de) * | 2007-09-11 | 2012-03-08 | Lindauer Dornier Gmbh | Verfahren zum Herunterfahren einer Webmaschine |
| EP2403983A1 (de) * | 2009-03-06 | 2012-01-11 | Lindauer Dornier Gesellschaft mbH | Verfahren zum betreiben einer webmaschine mit einer fachbildemaschine |
| JP6028773B2 (ja) * | 2014-09-09 | 2016-11-16 | 株式会社豊田自動織機 | エアジェット織機における緯糸処理方法 |
-
2021
- 2021-07-09 DE DE102021207297.6A patent/DE102021207297B3/de active Active
-
2022
- 2022-06-10 EP EP22734547.7A patent/EP4367306B1/de active Active
- 2022-06-10 CN CN202280048737.3A patent/CN117716079A/zh active Pending
- 2022-06-10 JP JP2024500291A patent/JP2024524560A/ja active Pending
- 2022-06-10 WO PCT/EP2022/065894 patent/WO2023280510A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023280510A1 (de) | 2023-01-12 |
| DE102021207297B3 (de) | 2022-03-17 |
| JP2024524560A (ja) | 2024-07-05 |
| EP4367306B1 (de) | 2025-07-30 |
| CN117716079A (zh) | 2024-03-15 |
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Legal Events
| Date | Code | Title | Description |
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