Method for removing erroneously introduced weft yarns and air jet loom

Abstract

A method for removing a weft thread which has been introduced incorrectly on an air-jet weaving machine and a corresponding air-jet weaving machine are proposed, wherein a first drive device drives an opening mechanism and wherein a second drive device drives a sley (36) together with the guide bars (32). A control mechanism operates the first drive device and the second drive device such that they run synchronously with one another in a normal weaving operation. The method according to the invention comprises the following steps: detecting a weft thread which has been introduced incorrectly into the shed with at least one warp thread stop motion; cancelling the synchronization between the first and second drive devices by means of the control mechanism; operating the second drive device by means of the control mechanism such that the guide bars (32) assume a first swivel position which swivels away from the warp-weft thread interlacing point (66); operating the first drive device by means of the control mechanism such that the opening mechanism converts the shed into a first open position with a relatively small opening angle (a); removing the incorrectly introduced weft thread on the introduction side or the exit side; cutting off the incorrectly introduced weft thread on the introduction side; and removing the incorrectly introduced and cut-off weft thread.

Description

Technical Field

[0001] The present invention relates to a method for removing erroneously introduced weft yarn in an air-jet loom, and to such an air-jet loom. Background Technology

[0002] A method and an air-jet loom are known from EP 0 310 804 B1, in which the weft yarn is introduced into the shed by means of a main air nozzle arranged on the weft yarn introduction side and a plurality of relay nozzles (Stafettendüsen) arranged along the shed formed by the warp yarns. Here, the shed, defined by the lower and upper sheds of the correspondingly offset warp yarns, is generated by a shedding mechanism driven by a first drive. The heald frame of the shedding mechanism periodically moves the warp yarns from the lower shed into the upper shed after each weft insertion and vice versa. After the weft yarn is introduced, the shed is switched to the closed position, and the reed, driven by a second drive, beats the weft yarn onto the warp-weft interlacing point. Subsequently, the introduced weft yarn is separated from the prepared weft yarn reserve by a separating mechanism, particularly a shearing mechanism, provided on the introduction side. The first and second drive mechanisms are driven by a control mechanism that ensures the two drive mechanisms always operate synchronously with each other.

[0003] On the side opposite to the lead-in side (hereinafter referred to as the lead-out side), the warp stop device checks for error-free weft introduction. Error-free weft introduction (in which the weft yarn passes through the warp stop device) does not result in an error signal. However, if the weft yarn is incorrectly introduced—a scenario also known as a weft break—the warp stop device outputs an error signal. This error signal causes the control mechanism to stop the loom. Because the stop cannot be immediate, the incorrectly introduced weft yarn is also beaten by the reed to the warp-weft interlacing point and must therefore be released from the warp-weft interlacing point in order to be removed.

[0004] To remove the erroneously introduced weft yarn, the control mechanism manipulates the first and second drive units in a known manner such that, on the one hand, the sheathing mechanism switches the shed to the open position and—as a result of synchronization and entirely intentionally—on the other hand, it causes the reed to rotate away from the warp and weft interlacing point. This rotation away lifts the erroneously introduced weft yarn, which also extends from the main air nozzle, at least at the introduction side from the warp and weft interlacing point, because the main air nozzle, like the front nozzle and the relay nozzle if necessary, is arranged on the reed holder and thus rotates away from the warp and weft interlacing point together with the reed holder. With the activation of the main air nozzle and the relay nozzle (and the front nozzle if necessary), the erroneously introduced weft yarn can then be released from the warp and weft interlacing point along its entire length and, together with the released portion of the weft yarn prepared on the introduction side, is transported to the lead-out side, where the weft yarn end is pulled and held by the suction nozzle. This process is referred to as "blowing" within the scope of this instruction manual.

[0005] As an alternative to the method of pulling out the incorrectly introduced weft yarn through the shed, some embodiments are known in which the incorrectly introduced weft yarn is pulled out of the shed by means of a mechanical mechanism on the introduction side.

[0006] After the shed is closed and the reed is mostly deflected toward the warp and weft interlacing point, the incorrectly introduced weft yarns, which are pulled and held by the suction nozzle, are separated on the lead-in side by means of a shearing mechanism. Subsequently, as the shed reopens and the reed turns away from the warp and weft interlacing point, the separated weft yarns are sucked out on the lead-out side by means of a suction nozzle. In the variation mentioned above, not described in EP 0 310 804 B1, where the weft yarns are mechanically removed from the shed on the lead-in side, the weft yarns are also cut off on the lead-in side and suitably removed on this side.

[0007] The next step is an inspection to check whether the weft yarn has actually been drawn out. This involves closing the shed and wefting the reed onto the warp-weft interlacing point. If the warp stop device then records the presence of the weft yarn, it means that the previously incorrectly introduced weft yarn was not completely removed from the shed. In this case, the weft yarn is manually removed by opening the shed afterwards.

[0008] For the air-jet loom described in EP 0 310 804 B1, it is disadvantageous that the warp yarns are repeatedly stretched over a longer period of time (compared to normal weaving operations) while automatically eliminating weft yarn breaks due to the repeated opening and closing of the shed during successive steps, which may then result in so-called growth areas (Anlaufstellen) in the finished fabric.

[0009] CN 105 401 311 B discloses a method for removing erroneously introduced weft yarns, wherein the loom is stopped and the weft yarns are cut when erroneously introduced weft yarns are detected. The warp yarns in the lower and upper sheds, along with the fabric, are then moved downwards toward the warp beam, and the lower and upper sheds are lowered together so that the reed and a relay nozzle can be rotated downwards. In this way, the cut, erroneously introduced weft yarns are pushed away from the selvage by means of the relay nozzle. The lower and upper sheds are then raised so that the opening of the relay nozzle can optimally act on the weft yarn to be drawn out and remove it.

[0010] DE 10 2007 043142 A1 discloses a method for shutting down a loom from a weaving operation until it stops according to a stop signal, wherein the shedding device is driven by an auxiliary motor via a shedding machine, and the reed is driven by the main motor of the loom, and wherein the synchronous drive of the shedding device and the reed is canceled in order to shut down the loom, and the reed, together with its drive mechanism, is braked without regard to the shedding machine. The method is characterized by: a) adjustment of the shed position to be achieved when the shedding machine stops being included in the process of shutting down the shedding machine; b) in the event of an interruption in the weaving operation caused by a weft break, the shedding machine is shut down according to a stop signal specific to this purpose, thereby opening the shed with the interrupted weft; and c) the removal of the weft break begins before the shedding machine stops. Summary of the Invention

[0011] The objective of this invention is to provide an automated method for removing erroneously introduced weft yarns in an air-jet loom, and an air-jet loom for automatically eliminating weft yarn breaks, wherein growth in the fabric is avoided or at least reduced.

[0012] This task is accomplished by a method and an apparatus having the corresponding features of this disclosure.

[0013] According to the invention, when the control mechanism of the air-jet loom receives an erroneous signal from the warp stop device indicating a weft breakage, it cancels the synchronization between the first and second drive units and then operates the two drive units independently. For this purpose, the two drive units are mechanically separated, meaning they are not mechanically coupled to each other at any time, but are electronically synchronized during normal operation. Alternatively, the two drive units are mechanically coupled to each other during normal operation, and in this way can be synchronized to each other during normal operation, for example, by means of a correspondingly configured coupling that can be operated accordingly by the control mechanism, but can be decoupled from each other.

[0014] In order for the erroneously introduced weft yarn to be released from the warp-weft interlacing point—similar to known methods for automatically eliminating weft yarn breaks—the reed is rotated away from the warp-weft interlacing point by means of the operation of the second drive device. Unlike in the prior art, the control mechanism for this purpose operates the second drive device independently of the first drive device to position the reed in a first rotational position away from the warp-weft interlacing point. Through this rotational departure, it is advantageously possible to lift the weft yarn, still connected to the main air nozzle, from the warp-weft interlacing point on the introduction side and then—as also known in the prior art—release the weft yarn from the warp-weft interlacing point in the shed along the entire length of the weft yarn by means of at least one main air nozzle and the relay nozzle.

[0015] Furthermore, according to the invention, the first drive device is manipulated from the control mechanism without depending on the second drive device to switch the shed to a first open position with a smaller angle than the maximum angle reached during normal, i.e., continuous weaving operations, in order to blow out and / or suck in and / or mechanically remove erroneously introduced weft yarns. The angle is defined as the angle formed between the lower and upper sheds from the warp and weft yarn interlacing point. Because the shedding mechanism, by design, always raises the lower shed and lowers the upper shed when the shed narrows, the relay nozzles, arranged with the reed on the reed holder according to the invention, now penetrate the shed from below with a smaller extent, making the relay nozzles almost no obstacle to the weft yarns to be removed, and the weft yarns are less frequently, or even never, tangled at the relay nozzles again. Therefore, it is possible that erroneously introduced weft yarns can be removed from the shed with a significantly higher success rate. This advantage is achieved not only when pulling in the shed a wrongly introduced weft yarn (by blowing and / or sucking it in) but also when mechanically removing such a weft yarn on the introduction side.

[0016] As briefly described above, the first open position with a relatively small opening angle according to the invention can only be achieved when the first and second drive devices are not mechanically coupled to each other, or at least decoupled during the process of removing erroneously introduced weft yarns. According to the invention, therefore not only the shed opening but also the reed position can be freely, i.e., independently, adjusted relative to the shed. Preferably, the two drive devices are each configured as separate drive devices, wherein these two separate drive devices, although always decoupled, are synchronized to each other by means of the control mechanism during continuous weaving operations. Upon determining a weft break, the reed is then deflected to a first turning position away from the warp and weft yarn interlacing point, as in the prior art, while the shedding mechanism, driven by the first drive device, switches the shed to the aforementioned first open position.

[0017] The first opening position is preferably, but not necessarily, the opening position of the shed immediately following the cancellation of synchronization of the two drive mechanisms. However, it is also possible to first move the shed to a forward, intermediate position, but this will not be beneficial in most cases.

[0018] Following the principle of blowing out and / or sucking in and / or mechanically removing the erroneously introduced weft yarn immediately after the shed is switched to the first open position according to the invention, the cutting of this weft yarn and its final removal are advantageously carried out accordingly according to the prior art, and are particularly preferred to be carried out while continuing to desynchronize the two drive devices. Preferably, the first and second drive devices are synchronized with each other only by corresponding manipulation from the control mechanism as normal weaving operations resume.

[0019] Particularly preferred is that, in the presence of the aforementioned error signal from at least one warp stop device, the control mechanism operates the first drive device such that the shed, after being switched to the first open position, remains in this first open position not only during the step of blowing out and / or sucking in and / or mechanically removing the erroneously introduced weft yarn, but also during the cutting of the erroneously introduced weft yarn. Furthermore, it is advantageous that the shed also remains in the first open position during the removal of the cut, erroneously introduced weft yarn. Furthermore, it is advantageous that the shed also remains in the first open position during a verification step, preferably implemented with a warp stop device, for checking the successful removal of the erroneously introduced weft yarn.

[0020] In a particularly preferred embodiment, the shed remains in the first open position until the loom is prepared and restarted using the first and second drive devices, which are then synchronized with each other again. In this last-mentioned variant, the shed is thus moved to the first open position after the synchronization is canceled and remains there throughout the process of eliminating weft yarn breaks, including, if necessary, inspection steps, until the start-up process for initiating the weaving operation of the loom begins.

[0021] Preferably, the control mechanism operates the second drive device in the presence of the aforementioned error signal from at least one warp stop device such that the reed remains in the first rotational position after deflection, during the blowing and / or suction and / or mechanical removal. This first rotational position is preferably as far away as possible from the warp-weft interlacing point so that the erroneously introduced weft can be released and pulled from the warp-weft interlacing point by the main nozzle arranged on the reed seat and the relay nozzle.

[0022] To cut off the incorrectly introduced weft yarn, the reed is preferably rotated to a second rotation position by means of a second drive device, controlled by manipulating the reed holder. In this second rotation position, the reed is close to the warp and weft yarn interlacing point, so that the incorrectly introduced weft yarn pulled in the shed can be cut off in a controlled manner. By deflecting towards this second rotation position, the incorrectly introduced weft yarn is preferably guided into the weft yarn cutter.

[0023] During the removal of the cut, incorrectly introduced weft yarn and / or in order to restart the weaving process during the subsequent resynchronization of the first and second drive units, the reed can be placed in a first turning position or preferably moved to a third turning position, in which the reed is preferably closer to the warp and weft interlacing point than in the first turning position and farther away from the warp and weft interlacing point than in the second turning position. This deflection of the reed along with the reed towards such a third turning position, closer to the warp and weft interlacing point than the first turning position, has the advantage that the reed must undergo a smaller turning distance from the second turning position in this third turning position, thereby shortening the duration of the automated method for removing the incorrectly introduced weft yarn, which in turn reduces the downtime of the loom after the weft yarn breakage. Furthermore, the risk of the sheared, mistakenly introduced weft yarn getting caught during extraction is further minimized because the relay nozzle still extends into the shed to a lesser extent in the third rotation position than in the first rotation position of the reed.

[0024] Particularly preferred is that the first drive device, in the event of an error signal from at least one warp self-stop device, is operated by the control mechanism such that the warp yarns of the upper shed and the lower shed form an angle of less than 30°, preferably less than 15°, and particularly preferably less than 12° in the first open position of the shed. These angular positions have proven advantageous for significantly reducing the error rate of weft breakage elimination and for protecting the warp yarns that are tensioned during weft breakage elimination.

[0025] It is also particularly preferred that the control mechanism operates the first drive device in such a way that the warp yarns of the upper shed and the lower shed form an angle greater than 4°, preferably greater than 6°, and particularly preferably greater than 7° in the first open position of the shed when there is an erroneous signal from at least one warp yarn self-stopping device.

[0026] The relatively small opening angle in the first open position avoids excessive elongation of the warp yarns, thereby reducing the number of elongated sections in the finished fabric. Simultaneously, it is possible to ensure that the relay nozzle, connected to the reed via the reed seat, does not penetrate too deeply into the shed.

[0027] Another advantage of the relatively small shed opening angle is the smaller draft in the left and right side brace areas. The side braces are used to hold the fabric in place at its two edges along the warp direction, preventing the fabric from shrinking towards the center due to mechanical stress. The smaller the shed opening, or shed angle, the less mechanical stress is exerted inwards on the fabric edges, because the yarn tension is barely increased for a small shed. This ultimately results in a more uniform warp and weft yarn interlacing pattern across the width of the fabric.

[0028] In a preferred embodiment, it has proven advantageous that the angle is between 7° and 12°.

[0029] Preferably, the control mechanism operates the first drive device in the event of an error signal from at least one warp self-stop device such that the relay nozzle, measured from the lower edge of the lowermost air outlet of the relay nozzle, extends into the shed through the layer of warp yarns in the first open position of the shed to an extent not exceeding 6 mm. The concept of "lowest air outlet" for each relay nozzle should also refer to the situation where one or more relay nozzles have only one unique air outlet. The advantage of the aforementioned design is that the air outlet (or the single air outlet) extends into the shed at only a small height, and thus the relay nozzle is hardly an obstacle to the weft yarn approaching from the introduction side.

[0030] Similarly, the present invention relates to an apparatus having the corresponding apparatus features derived directly from the above description, as described in this disclosure.

[0031] Advantageous improvements of the present invention are derived from the features of this disclosure. Attached Figure Description

[0032] The invention will be explained in detail here with the aid of the accompanying drawings. Wherein:

[0033] Figure 1 A jet loom is shown in a schematic side view;

[0034] Figure 2 A front view of the reed and pneumatic mechanism of the jet loom is shown;

[0035] Figure 3 A side view of the reed in its first turning position and in the shed is shown, which is shown on the one hand by the first angle α and on the other hand by the angle α' according to the prior art;

[0036] Figure 4 It shows Figure 3 The side view of the reed in the second turning position; and

[0037] Figure 5 It shows Figure 3 and 4 The side view of the reed in the third turning position. Detailed Implementation

[0038] exist Figure 1 The main components of the air-jet loom 1 are shown in a very generalized side view. Two heald frames 23 arranged sequentially in a known manner receive the warp yarns 2, wherein the two heald frames 23 move up and down in a push-pull motion by means of a first drive device 20. Thus, the warp yarns 2 form a lower shed 62 and an upper shed 64, which together produce a shed 60, which is opened and closed by the warp yarns 2 continuously switching from the lower shed 62 to the upper shed 64 and vice versa. When the shed 60 is open, the weft yarn 3 is fed through the shed 60 along the weft direction SR, which extends orthogonally to the warp direction KR (see...). Figure 2 The shed 60 is then closed by means of the shedding mechanism 22, and the reed 32 is driven onto the warp and weft yarn interlacing point 66 of the fabric 67. The reed 32 is arranged on the reed seat 36, which periodically rotates toward and away from the warp and weft yarn interlacing point 66 by the second drive device 30 during normal weaving operations.

[0039] Both the first drive unit 20 and the second drive unit 30 are controlled by the control mechanism 50 via corresponding signal lines 51 and 52. Particularly preferred is that the two drive units 20 and 30 are configured as separate drive units, and the control mechanism 50 can independently control each of these separate drive units. During normal weaving operations, the two drive units 20 and 30 are controlled in this way so that they operate synchronously to ensure the repetitive and precise movements necessary for the weaving cycle, namely shed formation and weft insertion.

[0040] Depend on Figure 2 The front view shows the weft insertion process into the shed 60. At least one main air nozzle 6 is arranged on the insertion side 8, to which weft material from a corresponding weft storage unit (not shown) is conveyed. It should be noted that there are different cases and arrangements of one or more main air nozzles 6. Therefore, it is possible that one or more main air nozzles 6 are arranged on the reed 36 and deflect with it. There are also variations in which one or two (or more) main air nozzles are arranged on the reed 36, while one or two (or more) stationary main air nozzles that do not deflect with the reed 36 are also provided. Here, taking at least one main air nozzle 6 arranged here on the reed 36 and deflected with it as a starting point, the main air nozzles are arranged according to... Figure 2 It is connected to the reed base 36 via connector 7.

[0041] The reed 32 is arranged on the reed holder 36 driven by the second drive device 30, wherein only some of the reed teeth 33 are shown on the outer surface. Furthermore, a plurality of relay nozzles 40, spaced apart along the weft direction SR, are arranged on a support 38 on the reed holder 36. One or more air outlets 42 of the relay nozzles are aligned with a channel 34 extending along the weft direction SR, which is formed by notches in the reed teeth 33 (see [reference needed]). Figure 3-5 The at least one main air nozzle 6 introduces the weft yarn 3 into the shed 60 on the introduction side 8. The weft yarn is then conveyed through the shed 60 in the channel 34 by the relay nozzle 40 and sucked in by the suction mechanism 45 arranged on the exit side 9. Subsequently, the shed 60 is closed by the opening mechanism 22, and the introduced weft yarn 3 is beaten onto the warp and weft yarn interlacing point 66 by the reed 32 and then cut off by the shearing mechanism 68 on the introduction side 8.

[0042] On the lead-out side 9, a warp stop device 48, consisting of an optical transmitter and an optical receiver, checks for the error-free introduction of each weft yarn 3. The warp stop device 48 only outputs an error signal when the weft yarn 3 is incorrectly introduced and fails to reach the warp stop device 48. This scenario is also referred to as a weft yarn break. The present invention relates to an improved method and an improved apparatus for automatically eliminating weft yarn breaks. The aforementioned error signal from the warp stop device 48 causes the control mechanism 50 connected to the warp stop device 48 to first stop the normal weaving operation of the air-jet loom 1. According to the invention, the control mechanism 50 then cancels the synchronization between the first and second drive devices 20, 30. The control mechanism 50 now manipulates the second drive device 30 such that the reed 32 occupies a first turning position away from the warp and weft yarn interlacing point 66, see [reference needed]. Figure 3 However, the reed 32—since the moving elements cannot stop immediately after the machine stops—will first push the incorrectly introduced weft yarn 3 toward the warp-weft interlacing point 66. If the at least one main air nozzle 6 is arranged on the reed seat 36 as is common and deflects with it, the incorrectly introduced weft yarn 3 can be released from the warp-weft interlacing point 66, at least in the area of ​​the main air nozzle 6, by the deflection of the reed 32 toward the first rotation position.

[0043] Furthermore, according to the invention, the control mechanism 50 manipulates the first drive device 20 such that the shedding mechanism 22 switches the shed 60 to a first open position, wherein the angle α of this first open position—measured from the warp and weft interlacing point 66 between the lower shed 62 and the upper shed 64—is less than the maximum angle α' of the open position reached during continuous weaving operations, see also Figure 3However, regardless, the conversion of the reed 32 to the first turning position, in conjunction with the shed 60 being placed in the first open position by the opening mechanism 22, provides the following feasible solution: the erroneously introduced weft yarn 3 can ultimately be removed from the shed 60. In this first open position of the shed, with a first angle α, the known step of blowing out the erroneously introduced weft yarn is then performed in the air-jet loom 1 shown in the figures. The concept of "blowing out" refers to the weft yarn 3, which is also connected to the weft yarn reservoir on the introduction side 8, being transported towards the lead-out side 9 by the activation of at least one main air nozzle 6 and a relay nozzle 40 (and, if necessary, one or more front nozzles) and pulled there by the suction mechanism 45. To allow the weft yarn end to reach the suction mechanism 45, a section of the weft yarn is released from the weft yarn reservoir. At the aforementioned pulled position, the erroneously introduced weft yarn 3 can be cut by the shearing mechanism 68 on the lead-in side 8 and finally removed. This is suitably done by means of a suction mechanism 45 on the lead-out side 9.

[0044] However, variations different from the mentioned blowing method can also be conceived, such as mechanically removing the erroneously introduced weft yarn 3 from the shed 60 by means of a traction mechanism on the introduction side 8 (this variation is not shown).

[0045] In all variations, the erroneously introduced weft yarn 3 is eventually cut off and removed by means of the shearing mechanism 68.

[0046] Back Figure 3 As can be seen from the figure, the shed 60 formed by the lower shed 62 and the upper shed 64 occupies an angle α of approximately 10° in its first open position, preferably between 7° and 12°. The angle α' between the lower shed 62' and the upper shed 64' (see...) Figure 3 During normal weaving operations, the shed 60 is in its maximum open position of more than 30°.

[0047] The small tension angle α provides the particular advantage that the warp yarn 2 offset from the heald frame 23 is stretched only slightly, at least during the stage of blowing out and / or drawing in and / or mechanically removing the erroneously introduced weft yarn 3. Furthermore, by Figure 3 As can be seen, the relay nozzle 40 extends only slightly into the shed 60 through the lower shed 62 in the first open position of the shed 60. Therefore, the erroneously introduced weft yarn 3—regardless of whether it is pulled towards the lead-out side 9 or pulled out on the lead-in side 8—is almost not tangled at the relay nozzle 40, thus achieving a higher success rate in automatically eliminating weft yarn breaks.

[0048] exist Figure 3 It is also depicted here that—shown only as a single entity—the air inlet 42, located at the free end of each relay nozzle 40, protrudes only slightly, preferably no more than 6 mm, through the lower shed 62. Thus, the function of blowing out the erroneously introduced weft yarn remains, while minimizing the degree of freedom of movement of the erroneously introduced weft yarn 3 in its path toward the lead-out side 9 or the lead-in side 8.

[0049] exist Figure 4 In this process, the reed 32 is deflected to a second rotation position near the warp and weft interlacing point 66 by means of the control mechanism 50 to allow for the subsequent removal of the erroneously introduced weft yarn 3. Since the synchronization between the two drive devices 20 and 30 is canceled, the shed can remain in the aforementioned first open position, allowing the warp yarn 2 to continue to be stretched only slightly.

[0050] Finally, Figure 5 The reed 32 is switched to a third turning position, in which it lies between the first and second turning positions, such that the reed 32 must only traverse a relatively small turning distance from the second turning position. The shed 60, on the other hand, can remain in the advantageous first open position with an angle α. In these positions of the reed 32 and shed 60, the erroneously introduced and cut weft yarn 3 is preferably removed by means of a suction mechanism 45. The risk of the cut weft yarn 3 being caught during suction is further minimized in this third turning position because the relay nozzle 40 extends into the lower shed 62 to a lesser extent than in the first turning position. Furthermore, the switching of the reed 32 to the described third turning position achieves time savings in the automatic process of eliminating weft yarn breaks and less downtime of the loom.

[0051] Following this removal of the mistakenly introduced weft yarn 3, which has been cut off, an inspection step can be performed to check whether the weft yarn 3 has actually been removed. For this purpose, the shed 60 remains in its previously reached open position with its relatively small angle, while the reed 32 moves to near the warp and weft yarn interlacing point 66 (in accordance with the arrangement of the shed 60 and the reed 32). Figure 4(Similar to the position). If the warp stop device 48 continues to record the presence of the weft yarn 3 and outputs a corresponding signal (i.e., reporting the presence of the weft yarn), it means that the previously incorrectly introduced weft yarn 3 was not completely removed from the shed 60. In this case, the weft yarn 3 is preferably removed manually when the shed 60 is subsequently opened.

[0052] Until the preparation for restarting the air-jet loom 1 (during which the first drive unit 20 and the second drive unit 30 operate synchronously via control from the control mechanism 50), the shed 60 is preferably still in the first open position with an angle α. The reed 32 is then advantageously moved by means of the second drive unit 30 controlled by the control mechanism 50 to the position where the shed 60 is... Figure 5 The shed 60 is positioned similarly to the third turning position described above, or remains in this third turning position after removing the erroneously introduced weft yarn 3. This has the effect described above of saving time in automatically eliminating weft yarn breaks and consequently reducing downtime. Therefore, with respect to the shed 60, the control mechanism 50 is configured such that, in the presence of an error signal from at least one warp stop device 48, it operates the preferred first drive device 20 so that the shed 60 remains in the first open position after its transition to the first open position until the resumption of continuous weaving. Only then is the heald frame 23 of the reed 32 and / or the shedding mechanism 22 preferably placed in a position necessary for the synchronization of continuous weaving with the shedding mechanism 22 and the reed 32, after which the weaving operation can continue.

[0053] The aforementioned prolonged stay in the first open position with a reduced shed angle has the advantage that the warp yarn 2 is only slightly stretched during the entire process of removing the weft yarn 3. Another advantage of the present invention, arising from the relatively small and preferably uniform shed angle, is the smaller draft in the shed support area and the uniform warp and weft yarn interlacing points. Through the free and independent adjustability of both the shed angle and the reed's position relative to the open shed, a high success rate can be achieved while automatically eliminating errors.

[0054] The present invention is not limited to the embodiments shown and described.

[0055] Therefore, it is not necessary to move the shed 60 to its first open position immediately after the machine stops; one or more intermediate positions are also possible beforehand. It is also possible that, after blowing out and / or sucking in and / or mechanically removing the erroneously introduced weft yarn 3, the shed 60 is moved to an open position or—and thus sequentially—to several other open positions, which preferably also have a relatively small opening angle of less than 30°. Additional warp-stopping devices can also be arranged at other positions relative to the shed 60; furthermore, the warp-stopping device 48 and / or other warp-stopping devices can be based on functional principles different from those achieved by means of optical detection.

[0056] List of reference numerals in the attached diagram:

[0057] 1. Air-jet loom

[0058] 2 warp yarns

[0059] 3 weft yarns

[0060] 6 Main air nozzles

[0061] 7 Connectors

[0062] 8. Introduction side

[0063] 9. Ejection side

[0064] 20 First drive unit

[0065] 22 Opening mechanism

[0066] 23. Comprehensive Framework

[0067] 30 Second drive unit

[0068] 32. Reed weaving

[0069] 33. Reed teeth

[0070] 34 channels

[0071] 36 Reed Seat

[0072] 38 brackets

[0073] 40 Relay Nozzle

[0074] 42 Air inlet

[0075] 45 Suction Mechanism

[0076] 48. Warp yarn self-stop device

[0077] 50 Control mechanism

[0078] 51 signal line

[0079] 52 signal lines

[0080] 60 shed

[0081] 62, 62' lower shed

[0082] 64, 64' upper shed

[0083] 66 warp and weft yarn interlacing points

[0084] 67. Textiles

[0085] 68 Shearing Mechanism

[0086] SR (Latitude)

[0087] KR Meridional

[0088] α angle

[0089] α' Angle (existing technology).

Claims

1. A method for removing erroneously introduced weft yarn (3) on an air-jet loom (1), the air-jet loom having at least one main air nozzle (6) along the weft direction (SR) and a plurality of relay nozzles (40) each having one or more air inlets (42) and arranged along a reed seat (36), wherein a first drive (20) drives an opening mechanism (22) for opening and closing a shed (60) defined by a warp yarn (2), wherein the shed (60) is formed by a lower shed (62) and an upper shed (64), and wherein The at least one main air nozzle (6) and the relay nozzle (40) transport the corresponding weft yarn (3) through the shed (60), and wherein the second drive (30) drives the reed seat (36) together with the reed (32) arranged on the reed seat (36) so that the reed periodically beats the weft yarns to the warp and weft yarn interlacing points (66) of the fabric (67), wherein the control mechanism (50) manipulates the first drive (20) and the second drive (30) so that they operate synchronously with each other during normal weaving operations. The method includes the following steps: At least one warp stop device (48) is used to detect the weft yarn (3) that has been mistakenly introduced into the shed (60), the warp stop device generating a corresponding error signal and transmitting it to the control mechanism (50). Upon receiving the error signal, the synchronization between the first drive device and the second drive device (20, 30) is immediately canceled by the control mechanism (50); The second drive unit (30) is then manipulated by the control mechanism (50) such that the reed (32) occupies a first rotational position that has rotated away from the warp and weft yarn interlacing point (66); and The first drive device (20) is manipulated by the control mechanism (50) such that the shedding mechanism (22) switches the shed (60) to a first open position by raising the lower shed and lowering the upper shed, wherein the angle (α) formed by the lower shed (62) and the upper shed (64) from the warp and weft yarn interlacing point (66) in the first open position is smaller than the angle (α') of the shed (60) at the maximum open position reached during continuous weaving operation; Immediately following, in the corresponding first open position of the shed (60), the incorrectly introduced weft yarn (3) is blown out and / or sucked in on the lead-in side (8) or lead-out side (9) of the weft yarn (3) and / or the incorrectly introduced weft yarn (3) is mechanically removed from the shed (60); Immediately afterwards, the incorrectly introduced weft yarn (3) is cut off on the introduced side (8); and Then remove the incorrectly introduced and cut weft yarns (3).

2. The method according to claim 1, characterized in that, The control mechanism (50) manipulates the first drive unit (20) in the presence of the aforementioned error signal from at least one warp self-stop device (48) such that the shed (60) remains in the first open position not only during the blowing and / or sucking and / or mechanical removal after it has been switched to the first open position, but also during at least one of the following steps: - During the period of cutting off the incorrectly introduced weft yarn (3); - During the period of cutting off and removing the incorrectly introduced weft yarn (3); -During the cutting and removal of the erroneously introduced weft yarn (3) and during the inspection step implemented with the warp self-stop device (48) to check the successful removal of the erroneously introduced weft yarn, or - During the period of cutting and removing the erroneously introduced weft yarn (3), during the inspection step, and until the weaving process restarts in the synchronized operation of the first drive unit and the second drive unit (20, 30).

3. The method according to claim 2, characterized in that, The control mechanism (50) manipulates the first drive unit (20) in the presence of the aforementioned error signal from at least one warp self-stop device (48) such that the shed (60) remains in the first open position not only during the blowing and / or sucking and / or mechanical removal after it has been switched to the first open position, but also during the following steps: During the period of cutting off and removing the erroneously introduced weft yarn (3) and until the weaving process restarts in the synchronized operation of the first drive unit and the second drive unit (20, 30).

4. The method according to claim 1 or 2, characterized in that, The control mechanism (50) manipulates the second drive device (30) in such a way that the reed (32) is placed in a second turning position near the warp and weft interlacing point (66) to cut off the erroneously introduced weft yarn (3), and / or to remove the erroneously introduced weft yarn (3) from the shed (60), and / or to restart the weaving process in the synchronized operation of the first drive device and the second drive device (20, 30), in a third turning position between the first turning position and the second turning position near the warp and weft interlacing point (66).

5. The method according to claim 1 or 2, characterized in that, The control mechanism (50) manipulates the first drive device (20) in such a way that, in the presence of the aforementioned error signal of at least one warp self-stop device (48), the warp yarns of the lower shed (62) and the warp yarns of the upper shed (64) form an angle of less than 30° in the first open position of the shed (60).

6. The method according to claim 5, characterized in that, The warp yarns of the lower shed (62) and the warp yarns of the upper shed (64) form an angle of less than 15° in the first open position of the shed (60).

7. The method according to claim 5, characterized in that, The warp yarns of the lower shed (62) and the warp yarns of the upper shed (64) form an angle of less than 12° in the first open position of the shed (60).

8. The method according to claim 1 or 2, characterized in that, The control mechanism (50) manipulates the first drive device (20) in the presence of the aforementioned error signal of at least one warp self-stop device (48) such that the warp yarns of the lower shed (62) and the warp yarns of the upper shed (64) form an angle greater than 4° in the first open position of the shed (60).

9. The method according to claim 8, characterized in that, The warp yarns of the lower shed (62) and the warp yarns of the upper shed (64) form an angle greater than 6° in the first open position of the shed (60).

10. The method according to claim 8, characterized in that, The warp yarns of the lower shed (62) and the warp yarns of the upper shed (64) form an angle greater than 7° in the first open position of the shed (60).

11. The method according to claim 1 or 2, characterized in that, In the event of an error signal from at least one warp self-stop device (48), the control mechanism (50) manipulates the first drive device (20) such that the relay nozzle (40) extends into the shed (60) in the first open position of the shed (60) to a extent not greater than 6 mm through the layer of warp yarns of the lower shed (62) when measured from the lower edge of the blowing area of ​​the relay nozzle (40).

12. An air-jet loom (1) having a device for removing erroneously introduced weft yarn (3), The device has at least one main air nozzle (6) and a plurality of relay nozzles (40) each having one or more air inlets (42) and arranged along the reed seat (36), wherein at least the at least one main air nozzle (6) and the relay nozzles (40) transport the corresponding weft yarn (3) through a shed (60) defined by the warp yarn (2), wherein the shed (60) is formed by a lower shed (62) and an upper shed (64). It has a first drive unit (20) for driving the opening mechanism (22) used to open and close the shed (60). The second drive device (30) is used to periodically drive the reed (32) arranged on the reed seat (36) to the warp and weft yarn interlacing point (66). It has at least one warp yarn self-stopping device (48) for detecting the weft yarn (3) that is mistakenly introduced into the shed (60) and for generating a corresponding error signal. It has a control mechanism (50) configured to operate the first drive unit and the second drive unit (20, 30) so that they operate synchronously with each other during normal weaving operations, and is configured to receive the aforementioned error signal from the at least one warp self-stop device (48), wherein at least the at least one main air nozzle (6) and the relay nozzle (40) and / or the suction mechanism (45) and / or the mechanical removal mechanism pull the erroneously introduced weft yarn (3) in the shed (60) or remove it from the shed (60) on the introduction side (8) of the weft yarn (3). It has a shearing mechanism (68) for cutting off the erroneously introduced weft yarn (3) on the introduced side (8), and It has a mechanism for removing the erroneously introduced and cut weft yarn (3), Its features are, The control mechanism (50) is configured such that upon receiving the aforementioned error signal from the warp stop device (48), it first cancels the synchronization between the first drive device and the second drive device (20, 30), and then further manipulates the second drive device (30) so that the reed (32) occupies a first turning position away from the warp and weft interlacing point (66), and further manipulates the first drive device (20) so that, in order to blow out and / or suck in the erroneously introduced weft yarn (3), the first drive device switches the shed (60) to a first open position by raising the lower shed and lowering the upper shed, wherein the angle (α) formed by the lower shed (62) and the upper shed (64) from the warp and weft interlacing point (66) in the first open position is smaller than the angle (α') of the maximum open position reached by the shed (60) during continuous weaving operations.

13. The air-jet loom (1) according to claim 12, characterized in that, The control mechanism (50) is configured to operate the first drive unit (20) in the presence of the aforementioned error signal from at least one warp self-stop device (48) so that the shed (60) remains in the first open position not only during the blowing and / or sucking and / or mechanical removal of the erroneously introduced weft yarn (3), but also: - During the period of cutting off the incorrectly introduced weft yarn (3); or - During the cutting and removal of the incorrectly introduced weft yarn (3); or - During the cutting and removal of the erroneously introduced weft yarn (3) and during the inspection step implemented with the warp yarn self-stop device (48) to check the successful removal of the erroneously introduced weft yarn; or -During the cutting and removal of the erroneously introduced weft yarn (3), during the inspection step, and until the weaving process restarts with the synchronized operation of the first drive unit and the second drive unit (20, 30), Remain in the first open position.

14. The air-jet loom (1) according to claim 13, characterized in that, The control mechanism (50) is configured to operate the first drive unit (20) in the presence of the aforementioned error signal from at least one warp self-stop device (48) so that the shed (60) remains in the first open position not only during the blowing and / or sucking and / or mechanical removal of the erroneously introduced weft yarn (3), but also: During the period of cutting and removing the erroneously introduced weft yarn (3) and until the weaving process restarts in synchronized operation of the first drive unit and the second drive unit (20, 30), Remain in the first open position.

15. The air-jet loom (1) according to claim 12 or 13, characterized in that, The control mechanism (50) is configured to manipulate the second drive device (30) such that it places the reed (32) in a second turning position near the warp and weft interlacing point (66) to cut off the erroneously introduced weft yarn (3), and / or to remove the erroneously introduced weft yarn (3) from the shed (60) and / or to restart the weaving process in the synchronized operation of the first drive device and the second drive device (20, 30), placing the reed (32) in a third turning position between the first turning position and the second turning position near the warp and weft interlacing point (66).

16. The air-jet loom (1) according to claim 12 or 13, characterized in that, The control mechanism (50) is configured to operate the first drive device (20) in the presence of the aforementioned error signal of at least one warp self-stop device (48) so that the warp yarns (2) of the lower shed (62) and the warp yarns (2) of the upper shed (64) form an angle (α) of less than 30° in the first open position of the shed (60).

17. The air-jet loom (1) according to claim 16, characterized in that, The warp yarns (2) of the lower shed (62) and the warp yarns (2) of the upper shed (64) form an angle (α) of less than 15° in the first open position of the shed (60).

18. The air-jet loom (1) according to claim 16, characterized in that, The warp yarns (2) of the lower shed (62) and the warp yarns (2) of the upper shed (64) form an angle (α) of less than 12° in the first open position of the shed (60).

19. The air-jet loom (1) according to claim 12 or 13, characterized in that, The control mechanism (50) is configured to operate the first drive device (20) in the presence of the aforementioned error signal of at least one warp stop device (48) so that the warp yarns (2) of the lower shed (62) and the warp yarns (2) of the upper shed (64) form an angle greater than 4° in the first open position of the shed (60).

20. The air-jet loom (1) according to claim 19, characterized in that, The warp yarns (2) of the lower shed (62) and the warp yarns (2) of the upper shed (64) form an angle greater than 6° in the first open position of the shed (60).

21. The air-jet loom (1) according to claim 19, characterized in that, The warp yarns (2) of the lower shed (62) and the warp yarns (2) of the upper shed (64) form an angle greater than 7° in the first open position of the shed (60).

22. The air-jet loom (1) according to claim 12 or 13, characterized in that, The control mechanism (50) is configured to operate the first drive unit (20) in the presence of the aforementioned error signal of at least one warp self-stop device (48) so that the relay nozzle (40) extends into the shed (60) in the first open position of the shed (60) to a extent not greater than 6 mm through the layer of warp yarns of the lower shed (62) when measured from the lower edge of the lowermost air outlet (42) of the relay nozzle (40).

23. The air-jet loom (1) according to claim 12 or 13, characterized in that, The first drive device (20) and the second drive device (30) are separate drive devices.

Images