Spinning machine

Abstract

A spinning machine is provided with a drafting device (5), an air spinning device (6), and a take-up device (9). The drafting device (5) draws the fiber bundle (10). The air spinning device (6) performs a spinning operation for generating a yarn (15) by applying a twisting air flow to the fiber bundle (10) drafted by the drafting device (5). The winding device (9) winds a yarn (15) to form a package (18). The drafting device (5) is provided with a first drafting roller (51) and a second drafting roller (52) which are sequentially arranged from downstream to upstream in the fiber advancing direction. When the fiber bundle (10) or the yarn (15) is cut, the rotation of the second drafting roller (52) is stopped. The air spinning device (6) continues the generation of the yarn (15) until the end of the fiber bundle (10) generated between the first drafting roller (51) and the second drafting roller (52) passes through the air spinning device (6) as the rotation of the second drafting roller (52) stops.

Description

Technical Field

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

[0002] Patent document 1 is Japanese Patent Application Publication No. 2019-7115. Patent document 2 is Japanese Patent Application Publication No. 2015-224397. Patent document 3 is Japanese Patent Application Publication No. 9-111546.

[0003] Patent Documents 1 and 2 disclose a spinning machine having a drafting device and an air spinning device. Patent Document 1 describes that the spinning operation is interrupted when the yarn is cut or the yarn is disconnected for some reason, and the drafting operation of the drafting device is interrupted when the spinning operation is interrupted. Patent Document 2 describes that when the drafting operation of the drafting device is stopped, if the air jet of the air spinning device is stopped, the yarn end cannot be properly twisted, and a fiber bundle portion is formed at the yarn end.

[0004] Patent document 3 discloses a spinning machine equipped with a drafting device and a false twisting device. The drafting device is equipped with a rear roller pair, a second roller pair, and a front roller pair in order from the upstream side. Patent document 3 describes the use of a clutch to stop the rotation of the rear roller pair and the second roller pair at the same time. As a result, the fiber bundle is torn apart between the continuously rotating front roller pair and the second roller pair. In addition, the drafting ratio between the front roller pair and the second roller pair is high. Therefore, the front end of the torn fiber bundle becomes thinner and the position of the front end is inconsistent. In the false twisting device of patent document 3, such a fiber bundle cannot be processed. Therefore, a process is required to prevent the front end of the fiber bundle from becoming thinner and to make the position of the front end consistent. Summary of 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 tend to scatter from the fiber bundle. It is necessary to remove the fibers scattered around by cleaning or the like. Therefore, when it is not necessary to form a fiber bundle, it is desirable to reduce the scattering of fibers from the yarn end. In this regard, Patent Documents 1 to 3 do not describe 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 a spinning machine capable of reducing the amount of fiber scattering from a yarn end.

[0007] Means used to solve the problem and its effect

[0008] The problems to be solved by the present invention are as described above. Next, means for solving the problems and their effects will be described.

[0009] According to the viewpoint of the present invention, a spinning machine having the following structure is provided. That is, the spinning machine includes a drafting device, an air-spinning device, and a winding device. The drafting device drafts a fiber bundle. The air-spinning device performs a spinning action of applying a whirling airflow to the fiber bundle drafted by the drafting device to generate a yarn. The winding device winds up the yarn to form a package. The drafting device includes a first drafting roller and a second drafting roller arranged in order from downstream to upstream in the direction of fiber travel. When the fiber bundle or the yarn is cut, the rotation of the second drafting roller stops. The air-spinning device continues to generate the yarn until the end of the fiber bundle generated between the first drafting roller and the second drafting roller as the rotation of the second drafting roller stops passes through the air-spinning device.

[0010] Thus, the fiber bundle is spun to the end to form a yarn. Therefore, it is difficult for a fiber bundle portion to be formed at the yarn end, and thus the amount of fiber scattering from the yarn end can be reduced.

[0011] In the above-mentioned spinning machine, the following configuration is preferred. That is, the above-mentioned air-jet spinning device includes a fiber guide component and a hollow guide shaft body. The above-mentioned fiber guide component guides the above-mentioned fiber bundle and allows the fiber bundle to pass through. The above-mentioned hollow guide shaft body has a passage for guiding the above-mentioned fiber bundle after passing through the above-mentioned fiber guide component. The above-mentioned air-jet spinning device can switch between a close state in which the above-mentioned fiber guide component and the above-mentioned hollow guide shaft body are close to each other and can generate the above-mentioned yarn, and a separated state in which the above-mentioned fiber guide component and the above-mentioned hollow guide shaft body are separated and cannot generate the above-mentioned yarn. When the above-mentioned fiber bundle or the above-mentioned yarn is cut, after the above-mentioned end of the above-mentioned fiber bundle passes through the above-mentioned air-jet spinning device, the above-mentioned air-jet spinning device switches from the above-mentioned close state to the above-mentioned separated state.

[0012] Thus, the air spinning device is in a close state until the end of the fiber bundle passes through the air spinning device, so the fiber bundle can be spun to the end to form a yarn. Thereafter, the air spinning device is switched to a separated state, so that fiber waste is less likely to accumulate inside the air spinning device.

[0013] In the spinning machine, the following configuration is preferred: that is, when the fiber bundle or the yarn is cut, the rotation of the first drafting roller is stopped after the rotation of the second drafting roller is stopped, or the rotation speed of the first drafting roller is reduced after the rotation of the second drafting roller is stopped, and the rotation of the first drafting roller is continued in the reduced speed state.

[0014] Thus, the first drafting roller continues to rotate when the second drafting roller stops rotating, so that the fiber bundle between the first drafting roller and the second drafting roller is reliably broken and the end of the fiber bundle can be fed to the pneumatic spinning device.

[0015] In the spinning machine, the following configuration is preferred. That is, the drafting device includes a third drafting roller and a fourth drafting roller. The third drafting roller is arranged upstream of the second drafting roller in the fiber running direction. The fourth drafting roller is arranged upstream of the third drafting roller in the fiber running direction. When the fiber bundle or the yarn is cut, the rotation of the third drafting roller and the rotation of the fourth drafting roller are stopped simultaneously with the stopping of the rotation of the second drafting roller.

[0016] This can prevent the fiber bundle between the second drafting roller to the fourth drafting roller from being loosened or broken.

[0017] The spinning machine is preferably configured as follows: that is, the spinning machine includes a suction device for sucking fiber waste generated by the drafting device. When the spinning operation is stopped, the fiber waste is sent out and sucked by the suction device by resuming the rotation of the second drafting roller.

[0018] This makes it possible to remove by suction the fiber waste around the second drafting roller or the fiber waste remaining on the apron belt wound around the second drafting roller.

[0019] In the above-mentioned spinning machine, the following configuration is preferred. That is, the spinning machine includes a first catching device, a second catching device, and a splicing device. The first catching device catches the yarn on the side of the air-spinning device when the yarn is disconnected between the air-spinning device and the winding device. The second catching device catches the yarn on the package side before winding the yarn on the package when the yarn is disconnected between the air-spinning device and the winding device. The splicing device splices the yarn on the side of the air-spinning device with the yarn on the package side.

[0020] The second catching device catches the yarn before being wound into the package, so there is no need to form a fiber bundle at the yarn end. Therefore, the disadvantage of spinning to the end of the fiber bundle to form the yarn is small, and the above-mentioned advantage (reducing the amount of fiber scattering from the yarn end) can be fully utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a spinning machine according to one embodiment of the present invention.

[0022] Figure 2 This is a side view of the spinning unit and the piecing trolley.

[0023] Figure 3 It is a side view of the drafting device and the air-spinning device.

[0024] Figure 4This is a flowchart showing a process for stopping and restarting the drafting operation and the spinning operation.

[0025] Figure 5 This is a timing chart of the drafting device and the air spinning device from stopping the drafting operation and the spinning operation to restarting them.

[0026] Figure 6 This is a diagram showing a state in which a fiber bundle portion is not formed at the end of the yarn due to spinning being performed to the end of the fiber bundle. DETAILED DESCRIPTION

[0027] Next, a 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 (that is, the fiber bundle or yarn running direction) during spinning.

[0028] The spinning machine 1 of the present embodiment includes a plurality of spinning units 2 arranged in parallel and a yarn joining cart 30.

[0029] like Figure 2 As shown, each spinning unit 2 includes a fiber bundle guide 4, a drafting device 5, an air spinning device 6, a yarn monitoring device 7, a yarn storage device 8, and a winding device 9 in order from upstream to downstream. 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, a RAM, a memory, etc., and performs processing to control each part of the spinning unit 2 by executing a program stored in the memory.

[0030] The fiber bundle guide 4 guides the fiber bundle 10 supplied from a sliver box (not shown). The fiber bundle 10 guided by the fiber bundle guide 4 is supplied to the drafting device 5 .

[0031] The drafting device 5 drafts the fiber bundle 10. The drafting device 5 includes a drafting bottom roller group 5a and a drafting top roller group 5b. Figure 3 As shown in FIG. 1 , the drafting bottom roller group 5a includes a plurality of drafting bottom rollers. Specifically, a front roller (first drafting roller) 51, an intermediate roller (second drafting roller) 52, a third roller (third drafting roller) 53, and a rear roller (fourth drafting roller) 54 are arranged in order from downstream to upstream in the fiber running direction. An apron belt 55 is wound around the intermediate roller 52. A tension rod 56 for adjusting the tension strength of the apron belt 55 is provided downstream of the intermediate roller 52.

[0032] The drafting top roller group 5b includes a drafting top roller facing each drafting bottom roller. In addition, an apron belt is wound around the drafting top roller facing the intermediate roller 52, and a tension rod is also provided.

[0033] The drafting device 5 includes a motor (not shown) for rotationally driving the drafting bottom roller. The motor is controlled by the unit control unit 26. By rotationally driving the drafting bottom roller, the fiber bundle 10 sandwiched between the drafting top roller and the drafting bottom roller can be conveyed while being stretched. Hereinafter, the operation of the drafting device 5 to stretch and convey the fiber bundle 10 is referred to as a drafting operation.

[0034] In addition, in the drafting device 5 of the present embodiment, a motor is provided for each spinning unit 2 and for each drafting bottom roller. In other words, one motor is assigned to one drafting bottom roller. Thus, for a specific drafting bottom roller of a specific spinning unit 2, it is possible to switch between rotation and stop or change the rotation speed. In addition, in order to perform the control described later, it is necessary to assign a motor separately to at least the intermediate roller 52. However, for other drafting bottom rollers, multiple drafting 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 rear roller 54 of one spinning unit 2 may be driven by one motor and a reducer.

[0035] The air spinning device 6 applies a twisting airflow to the fiber bundle 10 sent out by the drafting device 5 to perform air spinning, thereby generating a yarn 15. Figure 3 As shown, the pneumatic spinning device 6 includes a fiber guide member 61, a nozzle block 62, a hollow guide shaft body 63, a first arm 64, a second arm 65, and a rotary shaft 66.

[0036] The fiber guide member 61 guides the fiber bundle 10 sent out by the drafting device 5 toward the inside of the air spinning device 6. The nozzle block 62 is arranged downstream of the fiber guide member 61. The fiber guide member 61 and the nozzle block 62 may be configured as different components or as one component. A spinning nozzle for generating a whirling airflow is formed in the nozzle block 62. The hollow guide shaft body 63 is arranged at a position downstream of the nozzle block 62. The space between the fiber guide member 61 and the hollow guide shaft body 63 (in detail, the space surrounded by the fiber guide member 61, the nozzle block 62 and the hollow guide shaft body 63) functions as a spinning chamber, and a whirling airflow is generated inside the spinning chamber. In the spinning chamber, the whirling airflow acts on the fiber bundle 10, twisting the fiber bundle 10. The fiber bundle 10 that has passed through the spinning chamber is transported downstream through the passage formed in the hollow guide shaft body 63. Thus, the yarn 15 is generated and further transported downstream. Hereinafter, the operation of the air spinning device 6 twisting the fiber bundle 10 to generate the yarn 15 is referred to as a spinning operation.

[0037] The first arm 64 is a long member, and the fiber guide member 61 and the nozzle block 62 are fixed to one end in the longitudinal direction. The second arm 65 is a long member, and the hollow guide shaft body 63 is fixed to one end in the longitudinal direction. The other end in the longitudinal direction of the second arm 65 is supported by a rotating shaft 66. The second arm 65 can rotate around the rotating shaft 66.

[0038] With this configuration, the hollow guide shaft 63 is Figure 3 As shown by the solid line and the dotted line of , the position relative to the fiber guide member 61 can be changed. Hereinafter, the state in which the fiber guide member 61 and the hollow guide shaft body 63 are close to each other is referred to as the close state. Close means that the fiber guide member 61 and the hollow guide shaft body 63 are close to each other to the extent that the fiber guide member 61 and the hollow guide shaft body 63 form a spinning chamber. Therefore, in the close state, the yarn 15 can be generated. On the other hand, the state in which the fiber guide member 61 and the hollow guide shaft body 63 are separated is referred to as the separated state. In the separated state, the fiber guide member 61 and the hollow guide shaft body 63 are separated and do not form a spinning chamber, so the yarn 15 cannot be formed. In the present embodiment, the close state and the separated state are switched by the rotational movement of the hollow guide shaft body 63. However, the close state and the separated state may be switched by the linear movement of the hollow guide shaft body 63. The power source for rotating the hollow guide shaft body 63 is, for example, an air cylinder. In addition, the fiber guide member 61 may be movable instead of the hollow guide shaft body 63 or in addition to it.

[0039] A suction device 70 is provided below the front roller 51. A suction port is formed at the front end 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 and recovers fiber scraps that fall near the front roller 51 or the pneumatic spinning device 6.

[0040] 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 by means of an optical sensor (not shown). When the yarn monitoring device 7 detects a yarn defect in the yarn 15 (for example, an abnormal portion of the thickness of the yarn 15), the yarn monitoring device 7 sends a yarn defect detection signal to the unit control unit 26. When the unit control unit 26 receives the yarn defect detection signal, it switches the fiber bundle 10 or the yarn 15 to cut. The details of the cutting process will be described later. In addition, the yarn monitoring device 7 is not limited to an optical sensor, and for example, the thickness of the yarn 15 can also be monitored by an electrostatic capacitance sensor. In addition, as a yarn defect, foreign matter contained in the yarn 15 and / or abnormal tension of the yarn 15 can also be monitored.

[0041] A yarn storage device 8 is arranged downstream of the yarn monitoring device 7. Figure 2As shown, the yarn accumulating device 8 includes a yarn accumulating roller 23 and an electric motor 25 that drives and rotates the yarn accumulating roller 23 .

[0042] The yarn accumulating device 8 pulls out the yarn 15 from the air-spinning device 6 by rotating the yarn accumulating roller 23 through the electric motor 25. The yarn accumulating roller 23 can temporarily accumulate the pulled-out yarn 15 by winding it around the outer peripheral surface. Since the yarn 15 is temporarily accumulated in this way, the yarn accumulating device 8 functions as a buffer. Thus, it is possible to eliminate the unfavorable situation (such as slack of the yarn 15) when the spinning speed of the air-spinning device 6 and the winding speed of the winding device 9 are inconsistent for some reason.

[0043] The yarn 15 that has passed through the yarn accumulating device 8 is wound around a bobbin 17 by the winding device 9. The winding device 9 winds up 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.

[0044] The cradle arm 19 rotatably supports the bobbin 17 for winding the yarn 15. The winding drum 20 is in contact with the outer peripheral surface of the bobbin 17 or the outer peripheral surface of the package 18 and is driven to rotate, so that the bobbin 17 (or the package 18) is driven to rotate. 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. In this way, the yarn 15 wound on the bobbin 17 can be traversed.

[0045] The spinning unit 2 having the above-described structure can produce the yarn 15 from the fiber bundle 10 and wind the yarn 15 around the bobbin 17 to form the package 18 .

[0046] like Figure 1 as well as Figure 2 As shown, the yarn splicing cart 30 includes a yarn splicing device 31, a suction pipe (first catching device) 32, and a suction nozzle 33. The yarn splicing cart 30 performs a yarn splicing when the yarn 15 is disconnected. The yarn 15 is disconnected when the unit control unit 26 performs a cutting process or when the yarn 15 is disconnected due to a strong tension applied to the yarn 15 (that is, regardless of the operation of the spinning unit 2).

[0047] In addition, the yarn joining trolley 30 cooperates with the second catching device 24 of the spinning unit 2 to perform yarn joining. Figure 2As shown, the second catching device 24 is arranged downstream of the yarn storage device 8 and upstream of the joint device 31. The second catching device 24 is a cylindrical component. The second catching device 24 is connected to a negative pressure source (not shown), so that a suction flow can be generated inside the cylindrical component. In addition, the second catching device 24 is arranged at a position where it can attract the yarn 15 located in the yarn passage from the yarn storage device 8 to the winding device 9. The second catching device 24 generates a suction flow when the yarn 15 is broken, and catches the yarn 15 on the package 18 side upstream of the joint device 31. In other words, the second catching device 24 catches the yarn 15 on the package 18 side before being wound on the package 18 when the yarn 15 is broken. In addition, the yarn 15 on the package 18 side is the yarn 15 connected to the package 18 among the broken yarns 15.

[0048] The suction pipe 32 is connected to a negative pressure source. Thus, a suction flow can be generated inside the suction pipe 32. In addition, the suction pipe 32 is configured to be rotatable around the support shaft. In the case where the yarn 15 is broken (specifically, before the yarn 15 is broken and the drafting action and the spinning action are stopped and before the drafting action and the spinning action are started), the suction pipe 32 is rotated so that the opening at the front end approaches the air spinning device 6, and the suction pipe 32 captures the yarn 15 on the air spinning device 6 side. Thereafter, the suction pipe 32 returns to its original position (or an action position closer to the front than the original position), thereby guiding the yarn 15 on the air spinning device 6 side to the joint device 31. The yarn 15 on the air spinning device 6 side is the yarn 15 connected to the air spinning device 6 among the broken yarns 15 (in other words, the yarn 15 newly generated in the air spinning device 6 after the break).

[0049] When the second catching device 24 cannot catch the yarn 15 on the package 18 side, the suction nozzle 33 is used. The suction nozzle 33 is connected to the negative pressure source to generate a suction flow inside. When the yarn 15 is broken, the suction nozzle 33 approaches the package 18 by rotating around the support shaft, and catches the yarn 15 wound on the package 18. After that, the suction nozzle 33 returns to the original position (or an operating position closer to the previous position than the original position), thereby guiding the yarn 15 on the package 18 side to the splicing device 31. In addition, the suction nozzle 33 can also be omitted.

[0050] In the state where the second catching device 24 and the suction pipe 32 catch the yarn 15, the piecing device 31 performs a piecing operation. Specifically, the piecing device 31 uses a yarn pulling rod (not shown) to take in the yarn 15 on the package 18 side and the yarn 15 on the air-spinning device 6 side. Next, after the piecing device 31 untwists the two yarns 15 by applying a whirling airflow, it applies another whirling airflow to ply and twist the two yarns 15, thereby joining the yarns 15 to each other. In addition, the piecing device 31 is not limited to a splicer using a whirling airflow, and may be, for example, a mechanical knotter.

[0051] When the splicing cart 30 includes a suction nozzle, the second catching device 24 may be omitted.

[0052] Next, the processing of the drafting device 5 and the air spinning device 6 from stopping the drafting operation and the spinning operation to restarting them will be described.

[0053] 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 stop the spinning operation. When the spinning operation is stopped, in order to prevent the continuous supply of the fiber bundle 10 to the air spinning device 6, the drafting operation of the drafting device 5 also needs to be stopped.

[0054] Here, by stopping the spinning action, the fiber bundle 10 is not acted on by the whirling airflow and 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 portion is formed. The fiber bundle portion is a portion that does not form a yarn because it is not twisted. Fibers are easily scattered from the fiber bundle portion. In the 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 to form a fiber bundle portion at the yarn end. In addition, this process is not limited to the case where the yarn monitoring device 7 detects a yarn defect, and can also be applied to various cases where the yarn 15 is in a disconnected state.

[0055] Below, according to Figure 4 Flowchart and Figure 5 The timing diagram is described in detail. Figure 4 The flowchart is executed by the unit control unit 26.

[0056] The unit control section 26 determines whether the yarn 15 needs to be cut (S101) while the yarn 15 is being produced and wound. The yarn 15 needs to be cut when a yarn defect detection signal is received from the yarn monitoring device 7 or winding of the package 18 is completed.

[0057] Figure 5The period from time T0 to time T1 is the time for generating and winding the yarn 15. Therefore, the spinning operation and the drafting operation are performed, the drafting rollers are rotated, and the air spinning device 6 is in the close state.

[0058] When the unit control section 26 determines that the yarn 15 needs to be disconnected, the rotation of the intermediate roller 52, the third roller 53 and the rear roller 54 is stopped at the same time (S102). In detail, the unit control section 26 sends a command to stop the rotation to the motors that respectively drive the intermediate roller 52, the third roller 53 and the rear roller 54. The motors receive the command and stop rotating. As a result, the rotation of the intermediate roller 52, the third roller 53 and the rear roller 54 stops. When a yarn defect detection signal is received from the yarn monitoring device 7, the rotation of the intermediate roller 52 is stopped immediately, so that the length from the yarn defect to the yarn end can be shortened. In the following, the description related to the motor of the drafting bottom roller is omitted, and it is only recorded as rotating or stopping the drafting bottom roller.

[0059] The time when the processing of step S102 is executed is equivalent to Figure 5 At time T1. Figure 5 As shown in the moment T1, the rotation of the intermediate roller 52, the third roller 53 and the rear roller 54 stops at the same time. With this, the drafting action is not performed. In addition, at this moment, the rotation of the front roller 51 continues. As a result, the front roller 51 pulls out the fiber bundle 10 from the intermediate roller 52 while the intermediate roller 52 (belt 55) stops rotating while sandwiching the fiber bundle 10. As a result, the fiber bundle 10 is disconnected between the front roller 51 and the intermediate roller 52, generating an end portion ( Figure 6 (see above).

[0060] Furthermore, since the rotation of the intermediate roller 52 and the third roller 53 is stopped at the same time, the fiber bundle 10 between the intermediate roller 52 and the third roller 53 is not pulled out. Since the rotation of the third roller 53 and the back roller 54 is stopped at the same time, the fiber bundle 10 between the third roller 53 and the back roller 54 is not pulled out. Therefore, since the rotation of the intermediate roller 52, the third roller 53 and the back roller 54 is stopped at the same time, the fiber bundle 10 on the upstream side of the intermediate roller 52 is less likely to be loose or broken. In addition, this process is not essential, and the timing of stopping the rotation of the intermediate roller 52, the third roller 53 and the back roller 54 may be different as long as the drafting roller on the upstream side stops rotating before the drafting roller on the downstream side.

[0061] Next, the unit control unit 26 determines whether the first predetermined time has passed (S103). The first predetermined time is a time that is preset and stored in the unit control unit 26. The starting point of time measurement is time T1 (in other words, the time when the drafting operation is stopped). The first predetermined time is longer than the time from when the rotation of the intermediate roller 52 and the like stops until the end of the fiber bundle 10 generated between the front roller 51 and the intermediate 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.

[0062] In this embodiment, the front roller 51 is continued to rotate and the spinning action is continued while the intermediate roller 52 and the like are stopped, and the air spinning device 6 is in the approaching state. Therefore, the end of the fiber bundle 10 is introduced into the air spinning device 6, and the fiber bundle 10 is spun. In addition, this process is continued until the first predetermined time has passed, so that the spinning is continued to the end of the fiber bundle 10. As a result, as shown in FIG. Figure 6 As shown in the figure below, the end 15a of the yarn 15 delivered from the air spinning device 6 is not a fiber bundle portion but a yarn-shaped portion. Therefore, it is difficult for fibers to fly from the end 15a of the yarn 15. According to the above, the effect of reducing the amount of fibers flying from the yarn end can be achieved.

[0063] In addition, when the suction nozzle 33 is used to capture the yarn 15 on the package 18 side, the yarn end of the yarn 15 wound on the package 18 is captured. Since the yarn end of the yarn 15 may be attached to the package 18, it may be easy to capture the yarn end when the yarn end is a fiber bundle portion. However, in this embodiment, the second capturing device 24 is mainly used to capture the yarn 15 on the package 18 side. The second capturing device 24 captures the traveling yarn 15, so whether the yarn end of the yarn 15 is a fiber bundle portion or a yarn-shaped portion, it will not have a significant impact on the success rate of capturing. Therefore, in this embodiment, the effect of reducing the amount of fiber scattering from the yarn end can be achieved, and it is also difficult to reduce the probability of capturing the yarn 15 on the package 18 side.

[0064] In addition, it is not essential to use the first predetermined time in step S103. For example, a sensor may be used to determine whether the end of the fiber bundle 10 has passed through the air spinning device 6. The sensor is, for example, arranged downstream of the air spinning device 6 and is a sensor for detecting the yarn 15 fed from the air spinning device 6. When the state in which the yarn 15 is detected by the sensor changes to a state in which the yarn 15 is not detected, the unit control section 26 determines that the end of the fiber bundle 10 has passed through the air spinning device 6.

[0065] When the unit control unit 26 determines that the first predetermined time has passed, it stops the rotation of the front roller 51 (S104), stops the generation of the whirling airflow and stops the spinning action (S105), and drives the air cylinder to switch the air spinning device 6 from the approach state to the separation state (S106). Figure 5 In the timing chart of , the time from time T1 to time T2 corresponds to the first predetermined time. Therefore, at time T2, the above three processes are performed.

[0066] By stopping the rotation of the front roller 51 after the first predetermined time has passed, it is possible to avoid the front roller 51 being rotated unnecessarily. By stopping the spinning operation after the first predetermined time has passed, it is possible to avoid sending out unnecessary air flow. By switching the air spinning device 6 to the separated state after the first predetermined time has passed, it is difficult for fiber waste to accumulate inside the air spinning device 6.

[0067] In addition, the stopping of the rotation of the front roller 51 (S104), the stopping of the spinning action (S105), and the switching of the air-spinning device 6 to the separation state (S106) can be performed simultaneously or at different timings. In addition, at least one of these processes can be omitted. Even in the case of omission, the end 15a of the yarn 15 can be formed into a yarn-shaped portion, so that the effect of reducing the amount of fiber scattering from the yarn end can be achieved. In addition, instead of stopping the rotation of the front roller 51, the rotation speed of the front roller 51 can be reduced and the rotation can be continued at a low speed. In addition, it is not necessary to stop the front roller 51 or reduce the rotation speed, and the front roller 51 can continue to rotate while maintaining the rotation speed.

[0068] Next, the unit control unit 26 determines whether the second prescribed time has passed (S107). The second prescribed time is a time that is pre-set and stored in the unit control unit 26. The starting point of the time measurement is the moment T1 (in other words, the moment when the drafting action is stopped). The second prescribed time is a time that is longer than the first prescribed time and is shorter than the time from the stop of the rotation of the intermediate roller 52, etc. to the restart of the spinning action. Therefore, the rotation of the intermediate roller 52 is restarted before the spinning action is restarted. In addition, the determination of step S107 may be performed without using the second prescribed time. For example, the unit control unit 26 may also determine whether the stop of the spinning action or the switch to the separation state is completed. In addition, the starting point for measuring the first prescribed time and the second prescribed time is an example and may also be different from the present embodiment.

[0069] When the unit control unit 26 determines that the second predetermined time has passed, the rotation of the intermediate roller 52 is restarted (S108). In addition, the unit control unit 26 restarts the rotation of the front roller 51 at a predetermined timing before the rotation of the intermediate roller 52 is restarted. The timing for restarting the rotation of the front roller 51 can be determined by, for example, using a threshold value in the same manner as the other methods. Figure 5 In the timing chart of , the time from time T1 to time T3 corresponds to the second predetermined time. Therefore, at time T3, the rotation of the intermediate roller 52 is restarted. As a result, the fibers attached to the intermediate roller 52 (especially the dragon belt 55) can be sent out and removed by suction by the suction device 70. In addition, in order to avoid clogging of the air spinning device 6 with fiber scraps, it is preferable to perform this process in a state where the fiber guide member 61 is separated from the front roller 51.

[0070] Thereafter, the unit control section 26 determines whether to resume the spinning operation (S109). One of the conditions for resuming the spinning operation is that the suction pipe 32 moves and the opening at the tip of the suction pipe 32 approaches the air spinning device 6.

[0071] When the unit control section 26 determines that the spinning operation is to be restarted, the unit control section 26 restarts the drafting operation and the spinning operation (S110). Figure 5 As shown at time T4, the air spinning device 6 is switched to the approach state, and all the drafting bottom roller groups 5a are driven to rotate, and the spinning action and the drafting action are performed. In addition, the timing of restarting the spinning action and the drafting action may not be strictly consistent. In addition, the intermediate roller 52 may temporarily stop rotating before restarting the spinning action, or may keep rotating. After that, the yarn 15 is spliced ​​and the winding of the yarn 15 is restarted.

[0072] As described above, the spinning machine 1 of the present embodiment includes the drafting device 5, the air spinning device 6, and the winding device 9. The drafting device 5 drafts the fiber bundle 10. The air spinning device 6 performs a spinning operation of applying a whirling airflow to the fiber bundle 10 drafted by the drafting device 5 to generate the yarn 15. The winding device 9 winds up the yarn 15 to form a package 18. The drafting device 5 includes the front roller 51 and the intermediate roller 52 arranged in the order from downstream to upstream in the fiber running direction. When the fiber bundle 10 or the yarn 15 is cut, the rotation of the intermediate roller 52 is stopped. The air spinning device 6 continues to generate the yarn 15 until the end 15a of the fiber bundle 10 generated between the front roller 51 and the intermediate roller 52 as the rotation of the intermediate roller 52 stops passing through the air spinning device 6.

[0073] Thus, the fiber bundle 10 is spun to the end to form the yarn 15. Therefore, since it is difficult to form a fiber bundle portion at the yarn end, the amount of fiber scattering from the yarn end can be reduced. In addition, the amount of waste yarn (yarn end) can also be reduced. Furthermore, the length to the yarn end can be stabilized.

[0074] In the spinning machine 1 of the present embodiment, the air spinning device 6 includes a fiber guide member 61 and a hollow guide shaft 63. The fiber guide member 61 guides the fiber bundle 10 and allows the fiber bundle 10 to pass through. The hollow guide shaft 63 has a passage for guiding the fiber bundle 10 that has passed through the fiber guide member 61. The air spinning device 6 can switch between an approach state in which the fiber guide member 61 and the hollow guide shaft 63 are approached and the yarn 15 can be generated, and a separated state in which the fiber guide member 61 and the hollow guide shaft 63 are separated and the yarn 15 cannot be 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 is switched from the approach state to the separated state.

[0075] Thus, the air spinning device 6 is in the close state until the end of the fiber bundle 10 passes through the air spinning device 6, so that the fiber bundle 10 can be spun to the end to form a yarn-like portion. Thereafter, the air spinning device 6 is switched to the separated state, so that fiber waste is less likely to accumulate inside the air spinning device 6.

[0076] In the spinning machine 1 of this embodiment, when the fiber bundle 10 or the yarn 15 is cut, the rotation of the front roller 51 stops after the rotation of the intermediate roller 52 stops, or the rotation speed of the front roller 51 is reduced after the rotation of the intermediate roller 52 stops, and the rotation of the front roller 51 continues at the reduced speed.

[0077] Thus, since the front roller 51 continues to rotate when the rotation of the intermediate roller 52 stops, the fiber bundle 10 between the front roller 51 and the intermediate roller 52 is reliably disconnected, and the end of the fiber bundle 10 can be fed to the air spinning device 6.

[0078] In the spinning machine 1 of the present embodiment, the drafting device 5 includes a third roller 53 and a rear roller 54. The third roller 53 is arranged upstream of the intermediate roller 52 in the fiber running direction. The rear roller 54 is arranged upstream of the third roller 53 in the fiber running direction. When the fiber bundle 10 or the yarn 15 is cut, the rotation of the third roller 53 and the rotation of the rear roller 54 are stopped simultaneously with the stop of the rotation of the intermediate roller 52.

[0079] This can prevent the fiber bundle 10 between the intermediate roller 52 and the rear roller 54 from being loosened or broken.

[0080] The spinning machine 1 of this embodiment includes a suction device 70 for sucking fiber waste generated by the drafting device 5. The fiber waste is sent out and sucked by the suction device 70 by resuming the rotation of the intermediate roller 52 while the spinning operation is stopped.

[0081] This can remove fiber waste around the intermediate roller 52 or fiber waste remaining on the apron belt 55 wound around the intermediate roller 52 by suction. Since the fiber waste is in a state before becoming yarn, the removed fiber waste by suction can also be recycled.

[0082] The spinning machine 1 of this embodiment includes a suction pipe 32, a second catching device 24, and a yarn splicing device 31. The suction pipe 32 catches the yarn 15 on the air spinning device 6 side when the yarn 15 is disconnected between the air spinning device 6 and the winding device 9. The second catching device 24 catches the yarn 15 on the package 18 side before the yarn 15 is wound on the package 18 when the yarn 15 is disconnected between the air spinning device 6 and the winding device 9. The yarn splicing device 31 splices the yarn 15 on the air spinning device 6 side with the yarn 15 on the package 18 side.

[0083] Since the second catching device 24 catches the yarn 15 before being wound into the package 18, it is not necessary to form a fiber bundle portion at the yarn end. Therefore, the disadvantage of spinning to the end of the fiber bundle 10 to form the yarn 15 is small, and the above-mentioned advantage (reducing the amount of fiber scattering from the yarn end) can be fully utilized.

[0084] As mentioned above, although the preferred embodiment and modification of this invention were described, the said structure can be changed as follows, for example.

[0085] In the above embodiment, the yarn accumulating device 8 pulls out the yarn 15 produced by the air spinning device 6. Alternatively, the delivery roller pair may pull out the yarn 15 produced by the air spinning device 6. In this case, the yarn accumulating device 8 and / or the mechanical dancer roller may be arranged downstream of the delivery roller pair.

[0086] In the above embodiment, the drafting device 5 includes four roller pairs, but at least one of the third roller pair and the rear roller pair may be omitted. Alternatively, the drafting device 5 may further include a roller pair upstream of the rear roller pair.

[0087] The flowchart shown in the above embodiment is an example, and part of the processing may be omitted, or the content of part of the processing may be changed, or a new processing may be added.

[0088] In the above embodiment, the spinning machine 1 includes the yarn splicing cart 30. However, each spinning unit 2 may include at least a part of the device related to yarn splicing, or the yarn splicing cart 30 may be omitted.

[0089] In the spinning machine 1, each device is arranged so that the yarn 15 supplied from the upper side in the machine height direction is wound on the lower side. However, each device may be arranged so that the yarn supplied from the lower side is wound on the upper side.

Claims

1. A spinning machine, characterized in that: have: A drafting device for drafting the fiber bundle; an air-spinning device for performing a spinning operation of generating yarn by applying a whirling airflow to the fiber bundle drafted by the drafting device; and a winding device for winding the yarn to form a package, The drafting device comprises a first drafting roller and a second drafting roller which are arranged in order from downstream to upstream in the fiber running direction. When the fiber bundle or the yarn is cut, The rotation of the second drafting roller is stopped. The pneumatic spinning device continues to generate the yarn until the end portion 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 pneumatic spinning device.

2. The spinning machine according to claim 1, characterized in that The above-mentioned air spinning device comprises: a fiber guide member for guiding the fiber bundle and allowing the fiber bundle to pass therethrough; and The hollow guide shaft has a passage for guiding the fiber bundle after passing through the fiber guide member. The pneumatic spinning device is capable of switching between a close state in which the fiber guide member is close to the hollow guide shaft and can generate the yarn, and a separated state in which the fiber guide member is separated from the hollow guide shaft and cannot generate the yarn. When the fiber bundle or the yarn is cut, the pneumatic spinning device is switched from the approaching state to the separated state after the end portion of the fiber bundle passes through the pneumatic spinning device.

3. The spinning machine according to claim 1 or 2, characterized in that: When the fiber bundle or the yarn is cut, After the rotation of the second drafting roller stops, the rotation of the first drafting roller stops, or after the rotation of the second drafting roller stops, the rotation speed of the first drafting roller is reduced, and the rotation of the first drafting roller is continued in the state of the reduced rotation speed.

4. The spinning machine according to any one of claims 1 to 3, characterized in that The above-mentioned drafting device has: a third drafting roller disposed upstream of the second drafting roller in the fiber traveling direction; and a fourth drafting roller disposed upstream of the third drafting roller in the fiber traveling direction; When the fiber bundle or the yarn is cut, the rotation of the second drafting roller is stopped, and the rotation of the third drafting roller and the rotation of the fourth drafting roller are stopped.

5. The spinning machine according to any one of claims 1 to 4, characterized in that The spinning machine includes a suction device for sucking fiber scraps generated by the drafting device. During the period when the spinning operation is stopped, the fiber waste is sent out and sucked by the suction device by resuming the rotation of the second drafting roller.

6. The spinning machine according to any one of claims 1 to 5, characterized in that The above spinning machine has: a first catching device for catching the yarn on the side of the pneumatic spinning device when the yarn is disconnected between the pneumatic spinning device and the winding device; a second catching device for catching the yarn before the yarn on the package side is wound into the package when the yarn is disconnected between the pneumatic spinning device and the winding device; and The yarn joining device joins the yarn on the pneumatic spinning device side with the yarn on the package side.

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