Spinning machine

Abstract

To provide an air spinning machine capable of reducing amount of fibers scattered from a yarn end.SOLUTION: An air spinning machine has a draft device, an air spinning device, and a winding device. The draft device drafts a fiber bundle. The air spinning device conducts a spinning operation to generate a yarn by actuating a swirling air flow on the fiber bundle drafted by the draft device. The winding device forms a package by winding up the yarn. The draft device has a first draft roller and a second draft roller disposed in the order from downstream to upstream in a fiber traveling direction. Rotation of the second draft roller stops when the fiber bundle or the yarn is cut. Stopping of the rotation of the second draft roller causes the air spinning device to continue to generate the yarn until an end of the generated fiber bundle passes between the first draft roller and the second draft roller.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention mainly relates to an air spinning machine including a draft device and an air spinning device. [Background technology]

[0002] Patent Documents 1 and 2 disclose an air spinning machine equipped with a draft device and an air spinning device. Patent Document 1 describes that the spinning operation is interrupted when the yarn is cut or broken for some reason, and that the draft operation of the draft device is interrupted when the spinning operation is interrupted. Patent Document 2 describes that when the draft operation of the draft device is stopped, the yarn end is not properly twisted when the air injection of the air spinning device is stopped, and a fiber bundle portion is formed at the yarn end.

[0003] Patent Document 3 discloses a spinning machine equipped with a draft device and a false twist device. The draft device includes, in order from the upstream side, a back roller pair, a second roller pair, and a front roller pair. Patent Document 3 describes using a clutch to simultaneously stop the back roller pair and the second roller pair. As a result, the fiber bundle is torn off between the front roller pair and the second roller pair, which continue to rotate. In addition, since there is a high draft ratio between the front roller pair and the second roller pair, the torn off fiber bundle becomes tapered and the tip positions are not uniform. The false twist device of Patent Document 3 cannot process such fiber bundles, so a process is required to prevent the tip of the fiber bundle from becoming tapered and to align the tip positions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-7115 A [Patent Document 2] JP 2015-224397 A [Patent Document 3] Japanese Patent Application Publication No. 9-111546 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 2 discloses a process for forming a fiber bundle at a yarn end. However, when a fiber bundle is formed at a yarn end, fibers are likely to scatter from the fiber bundle. Since the fibers scattered around need to be removed by cleaning or the like, it is desirable to reduce the scattering of fibers from the yarn end when it is not necessary to form a fiber bundle. In this regard, Patent Documents 1 to 3 do not disclose a process for reducing the amount of fibers scattering from the yarn end.

[0006] The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide an air spinning machine capable of reducing the amount of fibers flying off from the yarn ends.

[0007] The problem to be solved by the present invention has been described above. Next, the means for solving this problem and the effects thereof will be described.

[0008] According to an aspect of the present invention, there is provided an air spinning machine having the following configuration. That is, the air spinning machine includes a draft device, an air spinning device, and a winding device. The draft device drafts a fiber bundle. The air spinning device performs a spinning operation to generate a yarn by applying a swirling air flow to the fiber bundle drafted by the draft device. The winding device winds the yarn to form a package. The draft device includes a first draft roller and a second draft roller arranged in this order from downstream to upstream in the fiber running direction. When the fiber bundle or the yarn is cut, the rotation of the second draft roller stops. The air spinning device continues generating the yarn until an end of the fiber bundle generated between the first draft roller and the second draft roller as the rotation of the second draft roller stops passes through the air spinning device.

[0009] As a result, the fiber bundles are spun all the way to the ends to become yarn, which makes it difficult for fiber bundles to form at the ends of the yarn, thereby reducing the amount of fibers scattering from the ends of the yarn.

[0010] The air spinning machine is preferably configured as follows. That is, the air spinning device includes a fiber guiding member and a hollow guide shaft. The fiber guiding member guides the fiber bundle and passes the fiber bundle. The hollow guide shaft has a passage through which the fiber bundle that has passed the fiber guiding member is guided. The air spinning device is switchable between a close state in which the fiber guiding member and the hollow guide shaft are close to each other and the yarn can be produced, and a separated state in which the fiber guiding member and the hollow guide shaft are separated from each other and the yarn is not produced. When cutting the fiber bundle or the yarn, after the end of the fiber bundle has passed through the air spinning device, the air spinning device switches from the close state to the separated state.

[0011] As a result, the air spinning device is in a close state until the end of the fiber bundle passes through the air spinning device, so that the fiber bundle can be spun up to the end to produce yarn. After that, the air spinning device switches to a separated state, so that fiber waste is less likely to accumulate inside the air spinning device.

[0012] The air spinning machine is preferably configured as follows: That is, when cutting the fiber bundle or the yarn, the rotation of the first draft roller stops after the rotation of the second draft roller stops, or the rotation of the first draft roller continues at a reduced speed after the rotation of the second draft roller stops.

[0013] As a result, since the first draft roller continues to rotate when the second draft roller is stopped, the fiber bundle between the first draft roller and the second draft roller is accurately severed and the end of the fiber bundle can be sent to the air spinning device.

[0014] The air spinning machine is preferably configured as follows. That is, the draft device includes a third draft roller and a fourth draft roller. The third draft roller is disposed upstream of the second draft roller in the fiber running direction. The fourth draft roller is disposed upstream of the third draft roller in the fiber running direction. When cutting the fiber bundle or the yarn, the rotation of the second draft roller stops and at the same time, the rotation of the third draft roller and the fourth draft roller stops.

[0015] This makes it possible to prevent the fiber bundle between the second draft roller and the fourth draft roller from becoming loose or being broken.

[0016] The air spinning machine is preferably configured as follows: That is, the air spinning machine includes a suction device that sucks up fiber waste generated by the draft device. When the spinning operation is stopped, the rotation of the second draft roller is resumed, and the fiber waste is sent out and sucked into the suction device.

[0017] This makes it possible to suck and remove the fiber waste around the second draft roller or the fiber waste remaining on the apron belt wrapped around the second draft roller.

[0018] The air spinning machine is preferably configured as follows. That is, the air spinning machine includes a first capturing device, a second capturing device, and a yarn joining device. When the yarn is broken between the air spinning device and the winding device, the first capturing device captures the yarn on the air spinning device side. When the yarn is broken between the air spinning device and the winding device, the second capturing device captures the yarn on the package side before the yarn is wound onto the package. The yarn joining device joins the yarn on the air spinning device side and the yarn on the package side.

[0019] Since the second capture device captures the yarn before it is wound into a package, there is little need to form a fiber bundle at the yarn end. Therefore, there are few disadvantages to spinning the fiber bundle to the end into yarn, and the above-mentioned advantage (reduced amount of fibers scattering from the yarn end) can be fully achieved. [Brief description of the drawings]

[0020] [Figure 1] 1 is a front view of a spinning machine according to an embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] 10 is a flowchart showing a process from stopping a draft operation and a spinning operation to restarting them. [Diagram 5] 5 is a timing chart of the draft device and the air spinning device from stopping the draft operation and the spinning operation to restarting them. [Figure 6] FIG. 13 is a diagram showing a state in which a fiber bundle portion is not formed at the end of the yarn by performing spinning up to the end of the fiber bundle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Next, an air spinning machine 1 according to an embodiment of the present invention will be described with reference to the drawings. In this specification, "upstream" and "downstream" refer to upstream and downstream in the fiber running direction (i.e., the direction in which a fiber bundle or yarn runs) during spinning.

[0022] The air spinning machine 1 of the present embodiment includes a plurality of spinning units 2 arranged in parallel, and a yarn splicing cart 30.

[0023] 2, each spinning unit 2 includes, from upstream to downstream, a fiber bundle guide 4, a draft device 5, an air spinning device 6, a yarn monitoring device 7, a yarn storage device 8, and a winding device 9. Each device included in the spinning unit 2 is controlled by a unit control unit 26. The unit control unit 26 is a computer including a CPU, RAM, storage, etc., and performs processing to control each part of the spinning unit 2 by executing a program stored in the storage.

[0024] The fiber bundle guide 4 guides the fiber bundle 10 supplied from a sliver case (not shown). The fiber bundle 10 guided by the fiber bundle guide 4 is supplied to a draft device 5.

[0025] The draft device 5 drafts the fiber bundle 10. The draft device 5 includes a draft bottom roller group 5a and a draft top roller group 5b. As shown in FIG. 3, the draft bottom roller group 5a includes a plurality of draft bottom rollers. Specifically, a front roller (first draft roller) 51, a middle roller (second draft roller) 52, a third roller (third draft roller) 53, and a back roller (fourth draft roller) 54 are arranged in this order from downstream to upstream in the fiber running direction. An apron belt 55 is wound around the middle roller 52. A tension bar 56 for adjusting the tension of the apron belt 55 is provided downstream of the middle roller 52.

[0026] The draft top roller group 5b includes a draft top roller facing each of the draft bottom rollers. An apron belt is wound around the draft top roller facing the middle roller 52, and a tension bar is further provided.

[0027] The draft device 5 includes a motor (not shown) that rotates and drives the draft bottom roller. The motor is controlled by a unit control unit 26. By rotating and driving the draft bottom roller, the fiber bundle 10 sandwiched between the draft top roller and the draft bottom roller can be conveyed while being stretched. Hereinafter, the operation of the draft device 5 to stretch and convey the fiber bundle 10 is referred to as a draft operation.

[0028] In the draft device 5 of this embodiment, one motor is provided for each spinning unit 2 and for each draft bottom roller. In other words, one motor is assigned to one draft bottom roller. This allows a specific draft bottom roller of a specific spinning unit 2 to be switched between rotation and stop, or to change the rotation speed. In addition, in order to perform the control described below, at least the middle roller 52 needs to be assigned an individual motor. However, for the other draft bottom rollers, multiple draft bottom rollers may be driven by one motor. For example, the front rollers 51 of multiple spinning units 2 may be driven by one motor. Alternatively, the third roller 53 and the back roller 54 of one spinning unit 2 may be driven by one motor and a reducer.

[0029] The air spinning device 6 performs air spinning by applying a swirling air flow to the fiber bundle 10 sent out by the draft device 5 to generate a yarn 15. As shown in Fig. 3, the air spinning device 6 includes a fiber guiding member 61, a nozzle block 62, a hollow guide shaft body 63, a first arm 64, a second arm 65, and a pivot shaft 66.

[0030] The fiber guide member 61 guides the fiber bundle 10 sent out by the draft device 5 toward the inside of the air spinning device 6. The nozzle block 62 is disposed downstream of the fiber guide member 61. The fiber guide member 61 and the nozzle block 62 may be configured as separate members or may be configured as one member. The nozzle block 62 is formed with a spinning nozzle for generating a swirling air flow. The hollow guide shaft body 63 is disposed downstream of the nozzle block 62. The space between the fiber guide member 61 and the hollow guide shaft body 63 functions as a spinning chamber, and a swirling air flow is generated inside the spinning chamber. In the spinning chamber, the swirling air flow acts on the fiber bundle 10, and the fiber bundle 10 is twisted. The fiber bundle 10 that has passed through the spinning chamber is sent downstream through a passage formed in the hollow guide shaft body 63. As a result, a yarn 15 is generated and sent further downstream. Hereinafter, the operation of the air spinning device 6 to twist the fiber bundle 10 to generate the yarn 15 will be referred to as a spinning operation.

[0031] The first arm 64 is a longitudinal member, and has one longitudinal end to which the fiber guiding member 61 and the nozzle block 62 are fixed. The second arm 65 is a longitudinal member, and has one longitudinal end to which the hollow guide shaft body 63 is fixed. The second arm 65 can rotate about a pivot shaft 66 that supports the other longitudinal end.

[0032] With this configuration, the hollow guide shaft body 63 can change its position relative to the fiber guide member 61, as shown by the solid and dashed lines in FIG. 3. Hereinafter, a state in which the fiber guide member 61 and the hollow guide shaft body 63 are close to each other is referred to as a close state. Close means that the fiber guide member 61 and the hollow guide shaft body 63 are close enough to each other to form a spinning chamber. In the close state, the yarn 15 can be produced. On the other hand, a state in which the fiber guide member 61 and the hollow guide shaft body 63 are separated is referred to as a separated state. In the separated state, the fiber guide member 61 and the hollow guide shaft body 63 are separated from each other to form a spinning chamber, and therefore the yarn 15 cannot be produced. In this embodiment, the close state and the separated state are switched by the rotational movement of the hollow guide shaft body 63, but the close state and the separated state may also be switched by the linear movement of the hollow guide shaft body 63. The power source for driving the hollow guide shaft body 63 is, for example, an air cylinder. Instead of or in addition to the hollow guide shaft body 63, the fiber guiding member 61 may be movable.

[0033] A suction device 70 is provided below the front roller 51. A suction port is formed at the tip of the suction device 70. The suction device 70 is connected to a negative pressure source (not shown) and can generate a suction flow at the suction port. The suction device 70 sucks in and collects fiber waste that has fallen near the front roller 51 or the air spinning device 6.

[0034] The yarn 15 generated by the air spinning device 6 passes through the yarn monitoring device 7. The yarn monitoring device 7 monitors the thickness of the traveling yarn 15 with an optical sensor (not shown). When the yarn monitoring device 7 detects a yarn defect in the yarn 15 (for example, a portion where the thickness of the yarn 15 is abnormal), it transmits a yarn defect detection signal to the unit control unit 26. When the unit control unit 26 receives the yarn defect detection signal, it performs a cutting process to cut the fiber bundle 10 or the yarn 15. The cutting process will be described in detail later. Note that the yarn monitoring device 7 is not limited to an optical sensor, and may monitor the thickness of the yarn 15 with, for example, a capacitance sensor. Furthermore, a foreign object contained in the yarn 15 and / or an abnormality in the tension of the yarn 15 may be monitored as the yarn defect.

[0035] The yarn pooling device 8 is disposed downstream of the yarn monitoring device 7. As shown in FIG. 2, the yarn pooling device 8 includes a yarn pooling roller 23 and an electric motor 25 that drives the yarn pooling roller 23 to rotate.

[0036] The electric motor 25 drives and rotates the yarn storage roller 23, causing the yarn storage device 8 to pull out the yarn 15 from the air spinning device 6. The yarn storage roller 23 can temporarily store the pulled-out yarn 15 by winding it around its outer circumferential surface. Since the yarn storage device 8 temporarily stores the yarn 15 in this manner, it functions as a kind of buffer. This makes it possible to eliminate problems (such as slack in the yarn 15) that may occur when the spinning speed of the air spinning device 6 and the winding speed of the winding device 9 do not match for some reason.

[0037] The yarn 15 that has passed through the yarn storage device 8 is wound onto a bobbin 17 by a winding device 9. The winding device 9 winds the yarn 15 to form a package 18. The winding device 9 includes a cradle arm 19, a winding drum 20, and a traverse device 21.

[0038] The cradle arm 19 rotatably supports the bobbin 17 for winding the yarn 15. The winding drum 20 contacts the outer circumferential surface of the bobbin 17 or the outer circumferential surface of the package 18 and is driven to rotate, thereby rotating the bobbin 17 (or the package 18). The traverse device 21 includes a traverse guide 22. The traverse guide 22 is driven in the winding width direction of the bobbin 17 while guiding the yarn 15. This allows the yarn 15 being wound around the bobbin 17 to traverse.

[0039] The spinning unit 2 having the above configuration can produce a yarn 15 from the fiber bundle 10 and wind it around a bobbin 17 to form a package 18.

[0040] 1 and 2, the yarn splicing cart 30 includes a yarn splicing device 31, a suction pipe (first capturing device) 32, and a suction mouth 33. The yarn splicing cart 30 performs yarn splicing when the yarn 15 is broken. Cases when the yarn 15 is broken include a case where the unit control section 26 performs a cutting process, and a case where the yarn 15 is broken due to strong tension being applied to the yarn 15, etc. (i.e., regardless of the operation of the spinning unit 2).

[0041] The yarn splicing cart 30 performs yarn splicing in cooperation with the second capturing device 24 of the spinning unit 2. As shown in FIG. 2, the second capturing device 24 is disposed downstream of the yarn storage device 8 and upstream of the yarn splicing device 31. The second capturing device 24 is a cylindrical member. The second capturing device 24 is connected to a negative pressure source (not shown), and thus a suction flow can be generated inside the cylindrical member. The second capturing device 24 is disposed at a position where it can suck the yarn 15 in the yarn path from the yarn storage device 8 to the winding device 9. When the yarn 15 is broken, the second capturing device 24 generates a suction flow and captures the yarn 15 on the package 18 side upstream of the yarn splicing device 31. In other words, when the yarn 15 is broken, the second capturing device 24 captures the yarn 15 on the package 18 side before being wound into the package 18. The yarn 15 on the package 18 side is the yarn 15 on the broken yarn 15 that is connected to the package 18.

[0042] The suction pipe 32 is connected to a negative pressure source. This allows a suction flow to be generated inside the suction pipe 32. The suction pipe 32 is configured to be rotatable around a support shaft. When the yarn 15 is cut (specifically, when the draft operation and spinning operation are stopped due to the cut of the yarn 15 and before the draft operation and spinning operation are started), the suction pipe 32 rotates to bring the opening at the tip close to the air spinning device 6, and the suction pipe 32 captures the yarn 15 on the air spinning device 6 side. After that, the suction pipe 32 returns to its original position (or an operating position before the original position), and the yarn 15 on the air spinning device 6 side is guided to the yarn joining device 31. The yarn 15 on the air spinning device 6 side is the yarn 15 on the side of the cut yarn 15 that is connected to the air spinning device 6 (in other words, the yarn 15 newly generated by the air spinning device 6 after the cut).

[0043] The suction mouth 33 is used when the second capturing device 24 cannot capture the yarn 15 on the package 18 side. The suction mouth 33 is connected to a negative pressure source and can generate a suction flow inside. If the yarn 15 is broken, the suction mouth 33 approaches the package 18 by rotating around a support shaft and captures the yarn 15 wound around the package 18. The suction mouth 33 then returns to its original position (or an operating position shorter than the original position), thereby guiding the yarn 15 on the package 18 side to the yarn joining device 31. The suction mouth 33 may be omitted.

[0044] With the second capturing device 24 and the suction pipe 32 capturing the yarn 15, the yarn splicing device 31 performs a yarn splicing operation. Specifically, the yarn splicing device 31 takes in the yarn 15 on the package 18 side and the yarn 15 on the air spinning device 6 side using a yarn pulling lever (not shown). Next, the yarn splicing device 31 applies a swirling air current to untwist the two yarns 15, and then applies another swirling air current to twist the two yarns 15 together and splice the yarns 15 together. Note that the yarn splicing device 31 is not limited to a splicer that uses a swirling air current, and may be, for example, a mechanical knotter.

[0045] When the yarn splicing cart 30 is provided with a suction mouth, the second capturing device 24 may be omitted.

[0046] Next, the processing of the draft device 5 and the air spinning device 6 from stopping the draft operation and the spinning operation until restarting them will be described.

[0047] For example, when the yarn monitoring device 7 detects a yarn defect, it is necessary to perform a cutting process to cut the fiber bundle 10 or the yarn 15 and to stop the spinning operation. When stopping the spinning operation, it is necessary to also stop the draft operation of the draft device 5 in order to prevent the fiber bundle 10 from being continuously supplied to the air spinning device 6.

[0048] Here, by stopping the spinning operation, the swirling air flow no longer acts on the fiber bundle 10, and the fiber bundle 10 or the yarn 15 is not twisted, so that the fiber bundle 10 or the yarn 15 can be cut. In this case, the end of the cut fiber bundle 10 or the yarn 15 is not twisted, so a fiber bundle part is formed. The fiber bundle part is a part that is not a yarn due to the lack of twist. Fibers tend to scatter from the fiber bundle part. In the air spinning machine 1 of this embodiment, in order to reduce the amount of fiber scattering from the yarn end, a process is performed to make it difficult for a fiber bundle part to be formed at the yarn end. This process is not limited to the case where the yarn monitoring device 7 detects a yarn defect, but can also be applied to various cases where the yarn 15 is in a divided state.

[0049] A specific description will be given below with reference to the flowchart of Fig. 4 and the timing chart of Fig. 5. The flowchart of Fig. 4 is executed by the unit control section 26.

[0050] The unit control unit 26 determines whether or not it is necessary to cut the yarn 15 while the yarn 15 is being produced and wound (S101). The yarn 15 needs to be cut when a yarn defect detection signal is received from the yarn monitoring device 7, when winding of the package 18 is completed, etc.

[0051] 5, the yarn 15 is produced and wound during the period from time T0 to time T1. Therefore, the spinning operation and the drafting device are being performed, the draft rollers are rotating, and the air spinning device 6 is in the vicinity.

[0052] When the unit control unit 26 determines that it is necessary to cut the yarn 15, it simultaneously stops the rotation of the middle roller 52, the third roller 53, and the back roller 54 (S102). In detail, the unit control unit 26 transmits a command to stop the rotation to the motors that rotate and drive the middle roller 52, the third roller 53, and the back roller 54, respectively. The motors stop rotating in response to this command. This stops the rotation of the middle roller 52, the third roller 53, and the back roller 54. When a yarn defect detection signal is received from the yarn monitoring device 7, the rotation of the middle roller 52 is immediately stopped, so that the length from the yarn defect to the yarn end can be shortened. In the following, a description of the motor of the draft bottom roller will be omitted, and it will simply be described that the draft bottom roller is rotated or stopped, etc.

[0053] As shown at time T1 in FIG. 5, the rotation of the middle roller 52, the third roller 53, and the back roller 54 stops simultaneously. Accordingly, the draft operation is no longer performed. At this point, the front roller 51 continues to rotate. As a result, in a state in which the middle roller 52 (apron belt 55) is stopped with the fiber bundle 10 sandwiched therebetween, the front roller 51 pulls out the fiber bundle 10 from the middle roller 52. As a result, the fiber bundle 10 is cut between the front roller 51 and the middle roller 52, and an end portion is generated (upper diagram in FIG. 6).

[0054] In addition, since the rotation of the middle roller 52 and the third roller 53 stops simultaneously, the fiber bundle 10 between the middle roller 52 and the third roller 53 is not pulled out. Since the rotation of the third roller 53 and the back roller 54 stops simultaneously, the fiber bundle 10 between the third roller 53 and the back roller 54 is not pulled out. Therefore, since the rotation of the middle roller 52, the third roller 53, and the back roller 54 stops simultaneously, slack or breakage is unlikely to occur in the fiber bundle 10 upstream of the middle roller 52. Note that this process is not essential, and the timing at which the rotation of the middle roller 52, the third roller 53, and the back roller 54 stops may be different as long as the upstream draft roller stops rotating before the downstream draft roller.

[0055] Next, the unit control unit 26 determines whether a first predetermined time has elapsed (S103). The first predetermined time is a time that is determined in advance and stored in the unit control unit 26. The first predetermined time is longer than the time from when the middle roller 52 and the like stop rotating until the end of the fiber bundle 10 generated between the front roller 51 and the middle roller 52 passes through the air spinning device 6. That is, in step S103, it is determined whether the end of the fiber bundle 10 has passed through the air spinning device 6.

[0056] In this embodiment, while the middle roller 52 and the like are stopped, the rotation and spinning operation of the front roller 51 continue, and the air spinning device 6 is in a proximate state. Therefore, the end of the fiber bundle 10 is introduced into the air spinning device 6, and the fiber bundle 10 is spun. This process continues until the first predetermined time has elapsed, and spinning is performed up to the end of the fiber bundle 10. As a result, as shown in the lower diagram of FIG. 6, the end 15a of the yarn 15 sent out from the air spinning device 6 is not a fiber bundle portion but a thread-like portion. Therefore, fibers are less likely to fly off from the end 15a of the yarn 15. As a result, the effect of reducing the amount of fibers flying off from the yarn end can be achieved.

[0057] When the suction mouth 33 is used to capture the yarn 15 on the package 18 side, the yarn end of the yarn 15 wound around the package 18 is captured. Since the yarn end of the yarn 15 may stick to the package 18, it may be easier to capture the yarn end if the yarn end is a fiber bundle. However, in this embodiment, the second capturing device 24 is mainly used to capture the yarn 15 on the package 18 side. Because the second capturing device 24 captures the yarn 15 while it is running, whether the yarn end of the yarn 15 is a fiber bundle or a thread-like portion does not greatly affect the success rate of capture. Therefore, in this embodiment, while realizing the effect of reducing the amount of fiber scattering from the yarn end, a decrease in the probability of capturing the yarn 15 on the package 18 side is unlikely to occur.

[0058] Furthermore, it is not essential to use the first predetermined time in step S103. For example, a sensor may be used to determine that the end of the fiber bundle 10 has passed through the air spinning device 6. The sensor is, for example, a sensor that is disposed downstream of the air spinning device 6 and detects the yarn 15 fed from the air spinning device 6. The unit control unit 26 determines that the end of the fiber bundle 10 has passed through the air spinning device 6 when the sensor transitions from a state in which it detects the yarn 15 to a state in which it does not detect the yarn 15.

[0059] When the unit control unit 26 determines that the first predetermined time has elapsed, it stops the rotation of the front roller 51 (S104), stops the generation of the swirling air current to stop the spinning operation (S105), and drives the air cylinder to switch the air spinning device 6 from the close state to the separated state (S106). In the timing chart of Fig. 5, the time from time T1 to time T2 corresponds to the first predetermined time. Therefore, at time T2, the above-mentioned three processes are performed.

[0060] By stopping the rotation of the front roller 51 after the first predetermined time has elapsed, it is possible to prevent the front roller 51 from being rotated unnecessarily. By stopping the spinning operation after the first predetermined time has elapsed, it is possible to prevent the discharge of unnecessary airflow. By switching the air spinning device 6 to the separated state after the first predetermined time has elapsed, fiber waste is less likely to accumulate inside the air spinning device 6.

[0061] The rotation of the front roller 51 may be stopped (S104), the spinning operation may be stopped (S105), and the air spinning device 6 may be switched to the separated state (S106) at the same time or at different times. At least one of these processes may be omitted. Even in the case of omission, the end 15a of the yarn 15 can be formed as a thread-like portion, so that the effect of reducing the amount of fiber scattering from the yarn end can be achieved. Instead of stopping the rotation of the front roller 51, the rotation speed of the front roller 51 may be reduced and the front roller 51 may continue to rotate at a low speed. Alternatively, the front roller 51 may continue to rotate while maintaining the rotation speed.

[0062] Next, the unit control unit 26 judges whether or not a second predetermined time has elapsed (S107). The second predetermined time is a time that is determined in advance and stored in the unit control unit 26. The second predetermined time is longer than the first predetermined time and shorter than the time from when the rotation of the middle roller 52, etc. is stopped to when the spinning operation is restarted. Therefore, the rotation of the middle roller 52 is restarted before the spinning operation is restarted. Note that the judgment of step S107 may be made without using the second predetermined time. For example, the unit control unit 26 may judge whether or not the spinning operation has been stopped or switched to the separated state.

[0063] When the unit control unit 26 determines that the second predetermined time has elapsed, it resumes the rotation of the middle roller 52 (S108). The unit control unit 26 resumes the rotation of the front roller 51 at a predetermined timing before resuming the rotation of the middle roller 52. In the timing chart of FIG. 5, the time from time T1 to time T3 corresponds to the second predetermined time. Therefore, the rotation of the middle roller 52 resumes at time T3. This allows the fibers adhering to the middle roller 52 (particularly the apron belt 55) to be sent out and removed by being sucked into the suction device 70. It is preferable to perform this process while the fiber guide member 61 is separated from the front roller 51 in order to prevent the air spinning device 6 from being clogged with fiber waste.

[0064] Thereafter, the unit control section 26 determines whether or not to resume the spinning operation (S109). One of the conditions for resuming the spinning operation is that the suction pipe 32 has moved and the opening at the tip of the suction pipe 32 has come close to the air spinning device 6.

[0065] When the unit control unit 26 determines to resume the spinning operation, it resumes the draft operation and the spinning operation (S110). Specifically, as shown at time T4 in Fig. 5, the unit control unit 26 switches the air spinning device 6 to the proximity state, drives and rotates all of the draft bottom roller group 5a, and executes the spinning operation and the draft operation. Note that the middle roller 52 may be stopped once before resuming the spinning operation, or may continue to rotate. After that, the yarn splicing is performed, and the winding of the yarn 15 is resumed.

[0066] As described above, the air spinning machine 1 of this embodiment includes the draft device 5, the air spinning device 6, and the winding device 9. The draft device 5 drafts the fiber bundle 10. The air spinning device 6 performs a spinning operation of generating the yarn 15 by applying a swirling air flow to the fiber bundle 10 drafted by the draft device 5. The winding device 9 winds the yarn 15 to form a package 18. The draft device 5 includes a front roller 51 and a middle roller 52, which are arranged in this order from downstream to upstream in the fiber running direction. When cutting the fiber bundle 10 or the yarn 15, the rotation of the middle roller 52 stops. The air spinning device 6 continues generating the yarn 15 until the end 15a of the fiber bundle 10 generated between the front roller 51 and the middle roller 52 as the rotation of the middle roller 52 stops passes through the air spinning device 6.

[0067] As a result, the fiber bundle 10 is spun up to the end to become the yarn 15. Therefore, the fiber bundle portion is less likely to be formed at the yarn end, so the amount of fibers scattering from the yarn end can be reduced. In addition, the amount of lint (hard waste) generated can also be reduced. Furthermore, the length to the yarn end can be stabilized.

[0068] In the air spinning machine 1 of this embodiment, the air spinning device 6 includes a fiber guide member 61 and a hollow guide shaft body 63. The fiber guide member 61 guides the fiber bundle 10 to pass through it. The hollow guide shaft body 63 has a passage through which the fiber bundle 10 that has passed through the fiber guide member 61 is guided. The air spinning device 6 can switch between a close state in which the fiber guide member 61 and the hollow guide shaft body 63 are close to each other and can generate the yarn 15, and a separated state in which the fiber guide member 61 and the hollow guide shaft body 63 are separated from each other and the yarn 15 is not generated. When cutting the fiber bundle 10 or the yarn 15, after the end 15a of the fiber bundle 10 passes through the air spinning device 6, the air spinning device 6 switches from the close state to the separated state.

[0069] As a result, the air spinning device 6 is in a close state until the end of the fiber bundle 10 passes the air spinning device 6, so that the fiber bundle 10 can be spun up to the end to form a thread-like portion. After that, the air spinning device 6 switches to a separated state, so that fiber waste is less likely to accumulate inside the air spinning device 6.

[0070] In the air spinning machine 1 of this embodiment, when cutting the fiber bundle 10 or the yarn 15, the front roller 51 stops rotating after the middle roller 52 stops rotating, or the front roller 51 continues rotating at a reduced speed after the middle roller 52 stops rotating.

[0071] As a result, since the front roller 51 continues to rotate when the middle roller 52 is stopped, the fiber bundle 10 between the front roller 51 and the middle roller 52 is accurately cut, and the end of the fiber bundle 10 can be sent to the air spinning device 6.

[0072] In the air spinning machine 1 of this embodiment, the draft device 5 includes a third roller 53 and a back roller 54. The third roller 53 is disposed upstream of the middle roller 52 in the fiber running direction. The back roller 54 is disposed upstream of the third roller 53 in the fiber running direction. When cutting the fiber bundle 10 or the yarn 15, the rotation of the middle roller 52 stops, and at the same time, the rotation of the third roller 53 and the back roller 54 stops.

[0073] This makes it possible to prevent the fiber bundle 10 between the middle roller 52 and the back roller 54 from becoming loose or being broken.

[0074] The air spinning machine 1 of the present embodiment includes a suction device 70 that sucks up fiber waste generated by the draft device 5. When the spinning operation is stopped, the rotation of the middle roller 52 is resumed, and the fiber waste is sent out and sucked into the suction device 70.

[0075] This makes it possible to suck and remove the fiber waste around the middle roller 52 or the fiber waste remaining on the apron belt 55 wound around the middle roller 52. Since the fiber waste is in a state before being turned into thread, the sucked and removed fiber waste can also be recycled.

[0076] The air spinning machine 1 of this embodiment includes a suction pipe 32, a second capturing device 24, and a yarn joining device 31. When the yarn 15 is broken between the air spinning device 6 and the winding device 9, the suction pipe 32 captures the yarn 15 on the air spinning device 6 side. When the yarn 15 is broken between the air spinning device 6 and the winding device 9, the second capturing device 24 captures the yarn 15 on the package 18 side before the yarn 15 is wound into the package 18. The yarn joining device 31 joins the yarn 15 on the air spinning device 6 side and the yarn 15 on the package 18 side.

[0077] Since the second capturing device 24 captures the yarn 15 before it is wound into the package 18, there is little need to form a fiber bundle part at the yarn end. Therefore, there are few disadvantages to spinning the fiber bundle 10 up to the end to form the yarn 15, and the above-mentioned advantage (reduced amount of fibers scattering from the yarn end) can be fully achieved.

[0078] The preferred embodiment and modifications of the present invention have been described above, but the above configurations can be modified, for example, as follows.

[0079] In the above embodiment, the yarn 15 spun by the air spinning device 6 is drawn out by the yarn pooling device 8. Alternatively, the yarn 15 spun by the air spinning device 6 may be drawn out by a delivery roller pair. In this case, the yarn pooling device 8 and / or a mechanical compensator may be disposed downstream of the delivery roller pair.

[0080] In the above embodiment, the draft device 5 includes four roller pairs, but one or two of them may be omitted. Alternatively, the draft device 5 may include an additional roller pair upstream of the back bottom roller pair.

[0081] The flowcharts shown in the above embodiment are merely examples, and some processes may be omitted, the contents of some processes may be changed, or new processes may be added.

[0082] In the above embodiment, the air spinning machine 1 includes the yarn splicing carriage 30, but each spinning unit 2 may include at least a part of the devices related to yarn splicing, or the yarn splicing carriage 30 may be omitted.

[0083] In the air spinning machine 1, the devices are arranged in the machine height direction such that the yarn 15 supplied at the upper side is wound at the lower side. However, the devices may be arranged such that the yarn supplied at the lower side is wound at the upper side. [Explanation of symbols]

[0084] 1. Spinning machine 5 Draft device 6. Air Spinning Device 9 Winding device

Claims

1. A draft device for drafting the fiber bundle; an air spinning device that performs a spinning operation by applying a swirling air flow to the fiber bundle drafted by the draft device to generate yarn; a winding device for winding the yarn to form a package; Equipped with The draft device includes a first draft roller and a second draft roller arranged in this order from downstream to upstream in a fiber running direction, When cutting the fiber bundle or the yarn, The rotation of the second draft roller is stopped, an air spinning device that continues to generate the yarn until an end of the fiber bundle generated between the first draft roller and the second draft roller passes through the air spinning device as the rotation of the second draft roller stops.

2. 2. The air spinning machine according to claim 1, The air spinning device includes: A fiber guiding member that guides the fiber bundle and allows the fiber bundle to pass through; a hollow guide shaft having a passage through which the fiber bundle that has passed through the fiber guiding member is guided; Equipped with the air spinning device is capable of switching between a close state in which the fiber guiding member and the hollow guide shaft are close to each other and the yarn can be produced, and a separated state in which the fiber guiding member and the hollow guide shaft are separated from each other and the yarn cannot be produced, An air spinning machine characterized in that, when cutting the fiber bundle or the yarn, after the end of the fiber bundle has passed through the air spinning device, the air spinning device switches from the close state to the separated state.

3. 3. The air spinning machine according to claim 1 or 2, When cutting the fiber bundle or the yarn, An air spinning machine characterized in that the rotation of the first draft roller stops after the rotation of the second draft roller stops, or the rotation of the first draft roller continues at a reduced speed after the rotation of the second draft roller stops.

4. An air spinning machine according to any one of claims 1 to 3, The draft device is a third draft roller disposed upstream of the second draft roller in the fiber running direction; a fourth draft roller disposed upstream of the third draft roller in the fiber running direction; Equipped with When the fiber bundle or the yarn is cut, the rotation of the second draft roller is stopped and at the same time, the rotation of the third draft roller and the rotation of the fourth draft roller are stopped.

5. An air spinning machine according to any one of claims 1 to 4, a suction device that suctions fiber waste generated by the draft device, The air spinning machine is characterized in that, while the spinning operation is stopped, the rotation of the second draft roller is resumed, thereby sending out fiber waste and sucking it into the suction device.

6. An air spinning machine according to any one of claims 1 to 5, a first capturing device configured to capture the yarn on the air spinning device side when the yarn is broken between the air spinning device and the winding device; a second capture device that captures the yarn on the package side before the yarn is wound onto the package when the yarn is broken between the air spinning device and the winding device; a yarn splicing device that splices the yarn on the air spinning device side and the yarn on the package side; An air spinning machine comprising:

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