Spinning machine

Abstract

A spinning machine (1) is provided with a drafting device (5), a spinning device (6), a take-up device (9), and a capture device (32). The drafting device (5) draws the fiber bundle (10). The spinning device (6) twists the fiber bundle (10) drafted by the drafting device (5) to generate a yarn (15). The winding device (9) performs a winding operation of winding a yarn (15) to form a package (18). The capturing device (32) captures the yarn (15) fed from the spinning device (6) and moves the yarn (15) to a target position. The drafting device (5) is provided with a front roller (51) disposed at the most downstream in the fiber advancing direction. When the winding operation is started, in a state that the front roller (51) rotates at a first speed, the capturing device (32) starts a capturing operation for the yarn (15) generated by the spinning device (6) through yarn output spinning. After the capturing device (32) starts the capturing operation and before the capturing device (32) reaches the target position, the front roller starts to accelerate.

Description

Technical Field

[0001] The present invention mainly relates to a spinning machine including a spinning device for performing yarn delivery spinning. Background Art

[0002] Patent document 1 is Japanese Patent Application Publication No. 2016-23391.

[0003] Patent document 1 discloses a spinning machine including a drafting device, an air-spinning device, and a winding device. The drafting device drafts a fiber bundle and supplies it to the air-spinning device. The drafting device includes a plurality of drafting rollers. The drafting roller arranged at the farthest downstream is called a front roller. The air-spinning device performs discharge spinning and normal spinning. The discharge spinning is a process in which a yarn is generated by performing a spinning different from normal spinning at the beginning of spinning without inserting a reference yarn (Japanese: seed yarn) into the air-spinning device. The winding device performs a winding action of winding the yarn generated by the air-spinning device to form a package. In addition, Patent document 1 discloses a case in which the rotation speed of the front roller is different in discharge spinning and normal spinning. Summary of the invention

[0004] In order to start the winding action, it is necessary to transfer to normal spinning or increase the rotation speed of the drafting roller after the yarn spinning. In order to increase the operating efficiency of the spinning machine, it is preferred to start the winding action in a short time. Patent document 1 does not fully disclose the process for starting the winding action in a short time.

[0005] 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 starting a winding operation in a short time.

[0006] Means used to solve the problem and its effect

[0007] 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.

[0008] 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, a spinning device, a winding device, and a catching device. The drafting device drafts a fiber bundle. The spinning device twists the fiber bundle drafted by the drafting device to generate yarn. The winding device performs a winding action of winding the yarn to form a package. The catching device performs a catching action of catching the yarn fed from the spinning device and moving it to a target position. The drafting device includes a first drafting roller disposed at the most downstream in the fiber travel direction. When the catching action starts, the catching device starts the catching action for the yarn generated by the yarn discharge spinning performed by the spinning device while the first drafting roller rotates at a first speed. After the catching device starts the catching action and before the catching device reaches the target position, the first drafting roller starts to accelerate.

[0009] Thus, compared with the case where the first drafting roller starts accelerating after the catching device reaches the target position, the time required to start the winding operation can be shortened.

[0010] In the above-mentioned spinning machine, the following structure is preferred. That is, the spinning machine is provided with a yarn storage roller, a yarn hanging component and a driving device. The above-mentioned yarn storage roller is arranged between the above-mentioned spinning device and the above-mentioned winding device in the yarn travel path, and stores the above-mentioned yarn. The above-mentioned yarn hanging component winds the yarn around the above-mentioned yarn storage roller. The above-mentioned driving device rotationally drives the above-mentioned yarn storage roller. When the above-mentioned winding action starts, after the above-mentioned catching device starts the above-mentioned catching action and before the above-mentioned yarn is hooked on the above-mentioned yarn hanging component, the above-mentioned first drafting roller starts to accelerate.

[0011] Thus, the rotation speed of the first drafting roller during yarn hooking becomes higher than the first speed. As a result, the success rate of yarn hooking can be increased compared to the case where the rotation speed of the first drafting roller is the first speed. In addition, the success rate of yarn discharge and spinning can be increased compared to the case where the rotation speed of the first drafting roller is higher than the first speed before starting the catching operation.

[0012] In the spinning machine, preferably, when the winding operation is started, the first drafting roller starts accelerating after the catching device starts the catching operation, after the yarn accumulating roller starts accelerating, and before the catching device reaches the target position.

[0013] By starting the acceleration of the yarn accumulating roller in advance (before the acceleration of the first drafting roller), the timing at which the rotation speed of the yarn accumulating roller reaches the target speed can be advanced. Therefore, even if the maximum acceleration of the yarn accumulating roller is small, the time required to start the winding operation can be shortened.

[0014] In the spinning machine, preferably, the first drafting roller and the yarn accumulating roller are accelerated synchronously at a timing when the yarn is hooked on the yarn hooking member.

[0015] Thus, the yarn can be hooked even when the first drafting roller and the yarn accumulating roller are accelerating.

[0016] In the spinning machine, the following configuration is preferred. That is, the rotation speed of the first drafting roller during the winding operation of the winding device is referred to as the second speed. The rotation speed of the yarn storage roller during the winding operation of the winding device is referred to as the normal speed. When the winding operation is started, the first drafting roller increases the rotation speed to the second speed after maintaining the first speed. The yarn storage roller continuously increases the rotation speed until it reaches the normal speed.

[0017] Although it is preferred that the first drafting roller rotates at a low speed during yarn delivery and spinning, the rotation speed of the yarn storage roller does not affect the success of yarn delivery and spinning. Therefore, by directly increasing the rotation speed of the yarn storage roller to the second speed, the success rate of yarn delivery and spinning can be improved, and the rotation speed of the yarn storage roller can be brought to the normal speed in advance.

[0018] In the above spinning machine, the following configuration is preferred. That is, the spinning machine includes a control unit for controlling at least the rotation speed of the first drafting roller. The drafting device includes a second drafting roller disposed at the most upstream in the fiber running direction. After the catching device starts the catching operation, the control unit determines whether a threshold time has passed since the second drafting roller started rotating, and starts accelerating the first drafting roller if it is determined that the threshold time has passed.

[0019] Thus, the timing for starting acceleration of the first draft roller can be determined by simple control.

[0020] In the above-mentioned spinning machine, the following configuration is preferred. That is, the spinning machine includes a control unit and a detection unit. The above-mentioned control unit controls at least the rotation speed of the above-mentioned first drafting roller. The above-mentioned detection unit detects that the above-mentioned catching device starts the above-mentioned catching action. When the above-mentioned winding action is started, the above-mentioned control unit starts accelerating the above-mentioned first drafting roller after the above-mentioned catching device starts the above-mentioned catching action and when the above-mentioned detection unit detects that the above-mentioned catching device starts the above-mentioned catching action.

[0021] This makes it possible to detect the start of the catching operation with high accuracy, and thus to start the acceleration of the first drafting roller at a more appropriate timing.

[0022] In the spinning machine, the following configuration is preferred. That is, the rotation speed of the yarn storage roller during the winding operation of the winding device is referred to as the normal speed. When the winding operation starts, after the yarn is hooked on the yarn hooking member, the yarn storage roller maintains the normal speed, or maintains the normal speed after accelerating to the normal speed.

[0023] Thus, the rotation speed of the yarn accumulating roller is maintained at a high speed, and thus the time required to start the winding operation can be shortened.

[0024] In the spinning machine, it is preferable that the drafting device includes a plurality of drafting rollers including the first drafting roller, and all the drafting rollers included in the drafting device are accelerated synchronously.

[0025] Thereby, the drafting roller can be accelerated while continuing to draft the fiber bundle.

[0026] The spinning machine preferably includes a yarn joining device for joining the yarn on the spinning device side caught by the catching device with the yarn on the package side when the yarn is broken.

[0027] Thereby, the yarn breakage can be eliminated and the winding operation can be started. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of a spinning machine according to one embodiment of the present invention.

[0029] Figure 2 This is a side view of the spinning unit and the piecing trolley.

[0030] Figure 3 It is a cross-sectional view showing the internal structure of the air spinning device.

[0031] Figure 4 This is a flowchart of the process for starting the winding operation.

[0032] Figure 5 This is a timing chart for starting the process of winding operation.

[0033] Figure 6 It is a graph showing changes in the rotation speeds of the front roller and the yarn accumulating roller.

[0034] Figure 7 It is a side view of the spinning unit and the yarn joining cart in a state where the yarn is broken.

[0035] Figure 8 It is a side view of the spinning unit and the yarn joining cart in a state where the second catching device catches the yarn on the package side.

[0036] Fig. 9 This is a side view of the spinning unit and the yarn joining cart in a state where the yarn on the package side and the yarn on the pneumatic spinning device side are guided to the yarn joining device.

[0037] Fig.10 This is a graph showing changes in the rotation speeds of the front roller and the yarn accumulating roller according to the first modification.

[0038] Fig.11 This is a graph showing changes in the rotation speeds of the front roller and the yarn accumulating roller according to the second modification. DETAILED DESCRIPTION

[0039] 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 fiber bundle or yarn running direction) during spinning.

[0040] An air spinning machine (spinning machine) 1 of the present embodiment includes a plurality of spinning units 2 arranged in parallel and a yarn joining cart 30.

[0041] like Figure 2 As shown, each spinning unit 2 is provided with a fiber bundle guide 4, a drafting device 5, an air spinning device (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 provided in the spinning unit 2 is controlled by a unit control unit 26. The unit control unit (control unit) 26 is a computer provided with 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.

[0042] 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 .

[0043] 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. The drafting bottom roller group 5a includes a plurality of drafting bottom rollers. Specifically, a front roller (first drafting roller) 51, an intermediate roller 52, a third roller 53, and a rear roller (second drafting roller) 54 are arranged in order from downstream to upstream in the fiber running direction. The rear roller 54 is arranged at the most upstream of the drafting bottom rollers. In addition, a dragon belt 55 is wound around the intermediate roller 52.

[0044] 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. Hereinafter, the drafting bottom roller and the drafting top roller are sometimes collectively referred to as drafting rollers.

[0045] 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 stretched while being conveyed. Hereinafter, the action of the drafting device 5 to stretch and convey the fiber bundle 10 is referred to as a drafting action. In addition, the unit control unit 26 sends a control command to the motor (or motor driver) to rotationally drive the drafting bottom roller, and the rotation of the drafting bottom roller and the drafting top roller is simply described as "the unit control unit 26 rotates (accelerates) the drafting roller" or the like.

[0046] In this embodiment, the four drafting rollers rotate synchronously. Synchronization means that the two rotational speeds are increased or decreased in the same manner. In other words, synchronization means that the rotational speeds of the drafting rollers are increased or decreased while maintaining a predetermined rotational speed ratio. That is, even when the rotational speeds of the drafting rollers are different (or not similar), it is equivalent to "synchronization". In addition, the draft ratio may be different when the rotational speed is low and when the rotational speed is high.

[0047] In the drafting device 5 of the present embodiment, one motor is provided for each spinning unit 2 and for each drafting roller. In other words, one motor is assigned to one drafting roller. Thus, for a specific drafting roller of a specific spinning unit 2, it is possible to switch between rotation and stop or change the rotation speed. In other words, each drafting roller constituting the drafting device 5 can rotate independently of each drafting roller of another spinning unit 2. In addition, this driving configuration is an example, and for example, the third roller 53 and the back roller 54 of one spinning unit 2 may be driven by one motor and a reducer.

[0048] 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. In addition, a spinning device that performs spinning other than air spinning may be used instead of the air spinning device 6. Figure 3 As shown, the pneumatic spinning device 6 includes a nozzle block 40 and a hollow guide shaft 44. The nozzle block 40 is provided with a fiber guide 41, a spinning chamber 42, and a first nozzle 43. The hollow guide shaft 44 is provided with a yarn passage 45 and a second nozzle 46.

[0049] The fiber guide 41 guides the fiber bundle 10 drafted by the drafting device 5 toward the inside (spinning chamber 42) of the air spinning device 6. The air spinning device 6 injects air from the first nozzle 43 into the spinning chamber 42 to apply whirling airflow to the fiber bundle 10 in the spinning chamber 42.

[0050] The hollow guide shaft body 44 is a cylindrical component, and a yarn passage 45 is formed inside it. The air-jet spinning device 6 generates a twisting air current in the yarn passage 45 by injecting air from the second nozzle 46 into the yarn passage 45. The direction of the twisting air current generated in the yarn passage 45 is opposite to that of the twisting air current in the spinning chamber 42. The air-jet spinning device 6 can perform yarn-out spinning (self-spinning) and normal spinning.

[0051] Yarn-out spinning (Japanese: 糸出し紡績) is the following operation: The air-jet spinning device 6 is a single unit, and while generating a twisting air current on the fiber bundle 10 to newly generate the yarn 15, it conveys the generated yarn 15 to the downstream side. By performing yarn-out spinning, the yarn 15 can be generated without inserting a reference yarn (Japanese: 種糸) into the air-jet spinning device 6. In the case of performing yarn-out spinning, the air-jet spinning device 6 injects air from the first nozzle 43 and the second nozzle 46. Thereby, the fiber bundle 10 is discharged from the hollow guide shaft body 44 while being spun into a bundled fiber shape. In yarn-out spinning, there is almost no tension for pulling the yarn 15 from the downstream side of the air-jet spinning device 6, or even if there is, it is only a weak tension generated by the suction air current of the suction pipe 32 described later. In yarn-out spinning, using the twisting air current generated by injecting air from the second nozzle 46, the fiber bundle 10 (yarn 15) is automatically sent out to the outside of the air-jet spinning device 6.

[0052] In yarn-out spinning, the fiber bundle 10 is gathered into a bundled fiber shape and sent to the downstream side. Therefore, for example, when the drafting speed and the spinning speed are too fast, the supply amount of the fiber bundle 10 per unit time becomes less, and yarn-out spinning may fail. Thus, when performing yarn-out spinning, it is preferable that the drafting speed and the spinning speed are low.

[0053] Normal spinning (Japanese: 通常紡績) is the following operation: After yarn-out spinning, the yarn 15 wound by the winding device 9 is continuously generated. When performing normal spinning, the air-jet spinning device 6 injects air from the first nozzle 43, but does not inject air from the second nozzle 46. In this state, the rear end of the fibers of the fiber bundle 10 supplied from the drafting device 5 dances around the front end of the hollow guide shaft body 44 due to the twisting air current generated in the spinning chamber 42 by injecting air from the first nozzle 43. Thereby, the fiber bundle 10 is twisted to generate the yarn 15. The yarn 15 is pulled out from the air-jet spinning device 6 by the yarn storage device 8 and travels downstream. In normal spinning, since the yarn 15 is pulled out from the air-jet spinning device 6 by the yarn storage device 8, the drafting speed and the spinning speed can also be high.

[0054] 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 receiving the yarn defect detection signal, the unit control unit 26 performs a cutting process of cutting the fiber bundle 10 or the yarn 15. The cutting process is the stop of the cutter, the spinning, or the stop of the drafting action. 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 an abnormality in the tension of the yarn 15 can also be monitored.

[0055] A yarn storage device 8 is arranged downstream of the yarn monitoring device 7. Figure 2 As shown, the yarn accumulating device 8 includes a yarn accumulating roller 81, an electric motor (driving device) 82, a yarn hooking member 83, and a yarn tail removing member 84.

[0056] The yarn storage roller 81 is driven to rotate by an electric motor 82. The yarn storage roller 81 winds the yarn 15 around its outer circumference and temporarily stores it. The yarn storage roller 81 rotates at a predetermined rotational speed while the yarn 15 is wound around its outer circumference, thereby being able to pull the yarn 15 out from the air-spinning device 6 at a predetermined speed. The electric motor 82 may also be a rotary actuator other than an electric motor. The electric motor 82 is controlled by the unit control unit 26. In the following description, the unit control unit 26 sends a control instruction to the electric motor 82 (or a motor driver) to drive the electric motor 82 to rotate, and rotating the yarn storage roller 81 is simply recorded as "the unit control unit 26 rotates (accelerates) the yarn storage roller 81" or the like.

[0057] The yarn hooking member 83 is capable of hooking the yarn 15. The yarn hooking member 83 is supported to be rotatable relative to the yarn storage roller 81. For example, a torque (resistance torque) that overcomes the relative rotation relative to the yarn storage roller 81 is applied to the yarn hooking member 83 by a torque generating unit composed of a magnetic unit or the like. Thus, if the tension applied to the yarn 15 is strong enough to overcome the resistance torque, the yarn hooking member 83 rotates independently relative to the yarn storage roller 81, and the yarn 15 is unwound from the yarn storage roller 81. If the tension applied to the yarn 15 is weaker than the resistance torque, the yarn hooking member 83 rotates integrally with the yarn storage roller 81, and the yarn 15 is wound around the yarn storage roller 81. When the drafting speed and the spinning speed are too low when hanging the yarn, the probability of yarn hanging failure increases because the tension of the yarn 15 becomes high. Therefore, when hanging the yarn, it is preferred that the drafting speed and the spinning speed are high.

[0058] Furthermore, when the yarn is hung, the yarn 15 generated by the air-spinning device 6 is wound around the yarn accumulating roller 81 while the yarn accumulating roller 81 is rotated. Therefore, it is preferable that the speed at which the yarn accumulating roller 81 winds up the yarn 15 is similar to the speed (i.e., the spinning speed) at which the air-spinning device 6 delivers the yarn 15. If these two speeds are greatly different, the accumulation amount of the yarn accumulating roller 81 cannot be maintained within an appropriate range.

[0059] In addition, the speed at which the yarn storage roller 81 winds up the yarn 15 is correlated with the rotation speed of the yarn storage roller 81. The spinning speed is correlated with the rotation speed of the drafting roller (e.g., the front roller 51). Therefore, when hanging the yarn, it is preferred that the yarn storage roller 81 rotates synchronously with the front roller 51. Here, as described above, synchronization means that the two rotation speeds are increased or decreased in the same manner. For example, the rotation speed of the yarn storage roller 81 when forming the package 18 is defined as 100%, and the rotation speed of the front roller 51 when forming the package 18 is defined as 100%. The current rotation speed of the yarn storage roller 81 is defined as N1%, and the current rotation speed of the front roller 51 is defined as N2%. In this case, when N1 is consistent with or approximately equal to N2, the rotation of the yarn storage roller 81 and the front roller 51 are synchronized. In addition, since the diameters of the yarn storage roller 81 and the front roller 51 are different, it is not necessary to make the rotation speed consistent.

[0060] The yarn tail removing member 84 is arranged near the yarn accumulating roller 81. The yarn tail removing member 84 can remove the yarn 15 from the yarn hanging member 83. Figure 1 As shown in the figure, the member is constructed in an L-shape, and its end portion is supported so as to be rotatable.

[0061] The yarn tail removing component 84 is configured to be able to Figure 2 The position shown (retracted position) is the same as Figure 8 The yarn tail removing component 84 moves between the positions shown in the figure (the yarn tail removing position). In the process of moving from the retracted position to the yarn tail removing position, the yarn tail removing component 84 passes through the space on the downstream side of the yarn accumulation roller 81. At this time, if there is a yarn 15 hooked on the yarn hanging component 83, the yarn tail removing component 84 acts on the yarn 15 to remove the yarn 15 from the yarn hanging component 83. By removing the yarn 15 from the yarn hanging component 83, the accumulated amount of the yarn 15 wound on the yarn accumulation roller 81 does not increase, and in a state where a certain amount (length) of the yarn 15 is wound on the yarn accumulation roller 81, the yarn 15 is unwound while being newly wound on the yarn accumulation roller 81. The action of moving the yarn tail removing component 84 from the retracted position to the yarn tail removing position is sometimes referred to as a "yarn tail removing action".

[0062] The yarn removing member 84 is provided in each spinning unit 2, and a separate driving unit (motor or cylinder, etc.) is provided for each yarn removing member 84. The driving unit of the yarn removing member 84 is controlled by the unit control unit 26. Therefore, the yarn removing member 84 can operate independently of the yarn removing members 84 of other spinning units 2.

[0063] The yarn storage device 8 can temporarily store the yarn 15 on the outer peripheral surface of the yarn storage roller 81, and thus functions as a buffer for the yarn 15. This can eliminate the inconvenience (for example, slack of the yarn 15) caused by the spinning speed of the air spinning device 6 and the winding speed (the traveling speed of the yarn 15 wound into the package 18) being inconsistent for some reason.

[0064] The yarn 15 having passed through the yarn accumulating device 8 is wound around a bobbin 17 by a winding device 9. The winding device 9 performs a winding operation of winding 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.

[0065] 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.

[0066] 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 a package 18 .

[0067] like Figure 1 as well as Figure 2 As shown, the yarn splicing trolley 30 includes a yarn splicing device 31, a suction pipe (capturing device) 32, and a suction nozzle 33. The yarn splicing trolley 30 is controlled by the trolley control unit 27. The trolley control unit 27 is a computer including a CPU, a RAM, a memory, etc., and controls the processing of each part of the yarn splicing trolley 30 by executing a program stored in the memory. The yarn splicing trolley 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, and when the yarn 15 is disconnected due to a strong tension applied to the yarn 15 (that is, it is not related to the operation of the spinning unit 2).

[0068] 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 disconnected, 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 disconnected. In addition, the yarn 15 on the package 18 side is the yarn 15 connected to the package 18 among the disconnected yarns 15.

[0069] The suction tube 32 is connected to a negative pressure source. Thus, a suction flow can be generated inside the suction tube 32. In addition, the suction tube 32 is configured to be rotatable around a support shaft. In the event that the yarn 15 is broken, the suction tube 32 is rotated so that the opening at its front end approaches the air spinning device 6, thereby capturing the yarn 15 generated by the air spinning device 6 spinning out of the yarn. Thereafter, the suction tube 32 returns to the standby position (target position), thereby guiding the yarn 15 on the side of the air spinning device 6 to the joint device 31. The target position refers to the position where the suction tube 32 is moved in order to guide the captured yarn 15 to the device of the next process. In the present embodiment, the standby position is the target position, but a position different from the standby position may also be the target position.

[0070] Hereinafter, the action of the suction tube 32 catching the yarn 15 and moving it to the target position is referred to as a catching action. The action of the suction tube 32 moving to the catching position near the air spinning device 6 is a preparatory action for performing the catching action, and therefore is not included in the catching action. The yarn 15 on the air spinning device 6 side is the yarn 15 on the side connected to the air spinning device 6 among the disconnected yarns 15 (in other words, the yarn 15 newly generated by the air spinning device 6 after disconnection).

[0071] In addition, a detection unit 32a is provided at the front end and inside the suction tube 32. The detection unit 32a is a reflective or transmissive optical sensor, and is a structure in which a light receiving unit receives light projected by a light projecting unit. The intensity of the light received by the light receiving unit changes depending on whether the yarn 15 exists on the light path projected by the light projecting unit. Thus, the detection unit 32a can detect whether the suction tube 32 captures the yarn 15. The detection unit 32a outputs the detection result to the unit control unit 26 via the carriage control unit 27. In addition, the detection unit 32a is not an essential component and can be omitted.

[0072] 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 a negative pressure source and can generate a suction flow inside. When the yarn 15 is broken, the suction nozzle 33 rotates around the support shaft to approach the package 18 and catch the yarn 15 wound on the package 18. After that, the suction nozzle 33 returns to the original position and guides the yarn 15 on the package 18 side to the splicing device 31. In addition, the suction nozzle 33 can also be omitted.

[0073] When the second catching device 24 and the suction tube 32 catch the yarn 15 or when the suction nozzle 33 and the suction tube 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-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.

[0074] Secondly, refer to Figures 4 to 9 The processing when the winding action is started is described. When the winding action is started refers to a situation where the winding of the yarn 15 is restarted or a situation where the winding action is restarted after the yarn 15 is temporarily interrupted due to a break in the yarn 15. In this embodiment, an example where the break in the yarn 15 occurs due to a yarn defect is described. In addition, the processing of this embodiment can also be applied to a situation where the winding of the yarn 15 is restarted or a situation where the yarn 15 is broken due to a strong tension and the winding action is restarted.

[0075] Specifically, the unit control unit 26 follows Figure 4 First, the unit control section 26 determines whether a yarn defect is detected (S101). This process is performed based on whether the yarn defect detection signal is received.

[0076] When the unit control unit 26 determines that a yarn defect is detected, it stops the drafting operation and normal spinning and cuts the yarn 15 (S102). As described above, the unit control unit 26 may also use a cutter to cut the yarn 15. In this case, the drafting operation and normal spinning are also stopped. Figure 7 The state immediately after the yarn 15 is cut is shown in FIG.

[0077] Next, the unit control section 26 causes the second catching device 24 to generate a suction flow to catch the yarn 15 on the package 18 side (S103). Figure 8, the state in which the yarn 15 is immediately captured by the second capturing device 24 is shown. In addition, the above-mentioned suction nozzle 33 may be used to capture the yarn 15 on the package 18 side instead of the second capturing device 24. In addition, in the process of capturing the yarn 15 on the package 18 side by the second capturing device 24, the yarn tail removing member 84 moves from the retreat position to the yarn tail removing position, and the yarn 15 stored in the yarn accumulating roller 81 is unwound from the yarn accumulating roller 81 and sucked by the second capturing device 24.

[0078] Next, the unit control section 26 starts accelerating the drafting roller with the first speed as the target, and starts accelerating the yarn storage roller 81 with the initial speed as the target (S104). A first speed and a second speed are set for the drafting roller. The second speed is the rotation speed of the drafting roller when the package 18 is formed. The first speed is a speed lower than the second speed. As described above, it is preferred that the rotation speed of the drafting roller is low during the yarn discharge spinning (especially before the suction tube 32 captures the yarn 15). Therefore, in the present embodiment, the yarn discharge spinning is performed with the rotation speed of the drafting roller set to the first speed, and the suction tube 32 captures the yarn 15. Thereby, the success rate of the yarn discharge spinning can be improved. In addition, in Figure 6 2 shows the change in the rotation speed of the front roller 51 which is one of the drafting rollers.

[0079] Furthermore, the front roller 51 rotates synchronously with the yarn accumulating roller 81, so while the rotation speed of the front roller 51 is maintained at the first speed, the rotation speed of the yarn accumulating roller 81 is also maintained at a predetermined speed. The rotation speed of the yarn accumulating roller 81 at this time is the initial speed. Similarly, the rotation speed of the yarn accumulating roller 81 corresponding to the second speed of the front roller 51 is the normal speed. In other words, the normal speed is the rotation speed of the yarn accumulating roller 81 when the package 18 is formed.

[0080] Furthermore, the unit control section 26 prepares for yarn discharge spinning at the same time as or near the timing when the front roller 51 and the yarn accumulating roller 81 start rotating. Specifically, air is injected from the first nozzle 43 and the second nozzle 46, respectively. Figure 5 In the timing chart shown, various preparations are started at time T1 to simply show the timing of the processing. However, these timings do not need to be strictly consistent, and may be before or after time T1.

[0081] After various preparations are completed, the unit control section 26 controls the drafting device 5 and the air spinning device 6 to start the drafting operation and the yarn discharge spinning (S105). Next, the unit control section 26 sends a command to the carriage control section 27 to start the catching operation of the suction pipe 32 (S106).

[0082] As described above, in the present embodiment, when the catching action is started, the rotation speed of the front roller 51 is the first speed. At the moment when the suction tube 32 catches the yarn 15, the yarn 15 is pulled out by the suction tube 32, and therefore, the air jet from the second nozzle 46 is stopped at an appropriate timing. In addition, if it is after the suction tube 32 starts the catching action (that is, if it is after the suction tube 32 catches the yarn 15), the yarn spinning is already completed, and therefore the front roller 51 can be accelerated. On the contrary, as described above, in order to improve the success rate of hanging the yarn, it is preferred that the drafting speed (that is, the rotation speed of the front roller 51) is high speed when hanging the yarn. In view of this, in the present embodiment, the acceleration of the front roller 51 is started in advance. Thus, the time required to start the winding action can be shortened.

[0083] Specifically, the unit control section 26 determines whether a threshold time has passed since the moment when the rear roller 54 starts rotating (S107). In the present embodiment, the timing of restarting the drafting operation, the timing of starting the yarn delivery and spinning, and the timing of starting the catching operation are determined with the moment when the rear roller 54 starts rotating as the starting point. The threshold time is the time obtained by adding a set time from the moment when the rear roller 54 starts rotating to the moment when the catching operation starts to the remaining time.

[0084] In addition, in the present embodiment, the starting point of the time measurement is not limited to the time when the rear roller 54 starts to rotate. The above starting point may be, for example, the time when the drafting rollers other than the rear roller 54 start to rotate, or the time when the air jet from the first nozzle 43 or the second nozzle 46 starts. Alternatively, instead of measuring the time, it is also possible to directly detect that the suction pipe 32 has caught the yarn 15. For example, the above-mentioned detection unit 32a may be used. In this case, in step S107, the unit control unit 26 determines whether a signal indicating that the detection unit 32a has detected the yarn 15 is received.

[0085] When the determination in step S107 is YES, the unit control section 26 starts accelerating the drafting roller at the second speed and starts accelerating the yarn accumulating roller 81 at the normal speed (S108). After reaching the second speed and the normal speed, control is continued to maintain these speeds.

[0086] The timing for starting acceleration of the drafting roller with the second speed as the target is Figure 5 The timing diagram is at time T2. Figure 5 As shown, the time T2 is after the catching action starts and before the catching action is completed (that is, before the suction pipe 32 reaches the target position). In addition, the time T2 is after the air injection by the second nozzle 46 is stopped. In addition, the time T2 is before the yarn hanging and the jointing start.

[0087] Next, the unit control unit 26 controls the suction tube 32 to move the suction tube 32 toward the target position. In the middle of the movement of the suction tube 32 toward the target position, the yarn 15 sucked by the suction tube 32 is hooked on the yarn hanging component 83. In other words, the yarn hanging is performed (S109). In the present embodiment, since the rotation speed of the front roller 51 becomes faster than the first speed before the yarn hanging starts, the success rate of the yarn hanging becomes higher. In addition, since the front roller 51 rotates synchronously with the yarn storage roller 81, the yarn hanging can be performed even if the front roller 51 and the yarn storage roller 81 are accelerating at the moment of yarn hanging. That is, at the moment of yarn hanging, the rotation speed of the front roller 51 may reach the second speed or may not reach the second speed.

[0088] The timing for starting the yarn hooking can be set appropriately. For example, the timing for starting the yarn hooking may be the time when a predetermined time has passed from the time when the rear roller 54 starts rotating.

[0089] Next, the unit control unit 26 sends a command to the carriage control unit 27 to cause the splicing device 31 to start splicing (S110). Fig. 9 As shown in the figure, the yarn splicing device 31 pulls the yarn 15 on the package 18 side and the yarn 15 on the air-spinning device 6 side closer by means of a yarn pulling rod (not shown) to splice the two yarns 15. After the splicing is completed, the normal winding is started again. The unit control unit 26 performs a yarn tail removal operation before the splicing is performed by the splicing device 31. After that, the unit control unit 26 performs the yarn hanging at an appropriate timing.

[0090] The method of changing the rotation speed of the front roller 51 and the yarn accumulating roller 81 of the present embodiment is one example, and for example, Fig.10 or Fig.11 Make the changes as shown.

[0091] Depending on the structure of the roller and / or the properties of the motor, the maximum acceleration of the yarn storage roller 81 may be lower than the maximum acceleration of the front roller 51. In this case, when the front roller 51 and the yarn storage roller 81 are rotated synchronously, the front roller 51 and the yarn storage roller 81 with the lower maximum acceleration are accelerated in unison. As a result, the time required to start the winding action becomes longer. The rotation speed of the yarn storage roller 81 does not affect the success rate of yarn spinning and yarn hanging. The condition required for the yarn storage roller 81 is that the front roller 51 and the yarn storage roller 81 rotate synchronously when hanging the yarn. That is, as long as the acceleration of the front roller (first drafting roller) 51 and the yarn storage roller 81 is synchronized at the moment when the yarn 15 is hooked on the yarn hanging component 83, the timing of starting acceleration and / or the timing of ending acceleration of the front roller 51 and the yarn storage roller 81 may be different.

[0092] With this in mind, Fig.10 as well as Fig.11In the illustrated modification, the front roller 51 and the yarn accumulating roller 81 rotate asynchronously in the stage before reaching the second speed and the normal speed.

[0093] exist Fig.10 In the first modified example shown, the start timing of the acceleration of the front roller 51 is the same as that of the above-mentioned embodiment. That is, the front roller 51 starts to accelerate from the first speed after the catching action starts and before the catching action is completed. On the other hand, the yarn accumulating roller 81 starts to accelerate from the initial speed before the front roller 51 starts to accelerate from the first speed. That is, the start timing of the acceleration of the yarn accumulating roller 81 is earlier than that of the front roller 51, so that the rotation speed of the yarn accumulating roller 81 can reach the normal speed earlier.

[0094] Furthermore, at the start of yarn hooking, the rotation speed of the front roller 51 reaches the second speed, and the rotation speed of the yarn accumulating roller 81 reaches the normal speed. Here, after the rotation speed of the front roller 51 reaches the second speed and the rotation speed of the yarn accumulating roller 81 reaches the normal speed, the front roller 51 rotates synchronously with the yarn accumulating roller 81. Therefore, the yarn hooking can be performed appropriately.

[0095] exist Fig.11 In the second modified example shown, the start timing of the acceleration of the front roller 51 is the same as that of the above-mentioned embodiment. On the other hand, the yarn accumulating roller 81 is not rotated at a certain initial speed for a predetermined time, but is accelerated with the normal speed as the target. That is, the yarn accumulating roller 81 (without maintaining the rotation speed at the initial speed) continuously increases the rotation speed until it reaches the normal speed. In this way, the rotation speed of the yarn accumulating roller 81 can be made to reach the normal speed in advance.

[0096] At the start of the yarn hooking, the rotation speed of the front roller 51 reaches the second speed, and the rotation speed of the yarn accumulating roller 81 reaches the normal speed. Fig.10 The first modification shown is similar to the one shown in the figure and the yarn can be hung appropriately.

[0097] In addition, in the first and second modified examples, the front roller 51 and the yarn storage roller 81 may be in the acceleration process at the start time of the yarn hanging. In this case, it is preferred that the front roller 51 and the yarn storage roller 81 rotate synchronously (accelerate) before the start time of the yarn hanging and maintain synchronization.

[0098] As described above, the pneumatic spinning machine 1 of the present embodiment includes the drafting device 5, the pneumatic spinning device 6, the winding device 9, and the suction pipe 32. The drafting device 5 drafts the fiber bundle 10. The pneumatic spinning device 6 twists the fiber bundle 10 drafted by the drafting device 5 to generate the yarn 15. The winding device 9 performs a winding operation of winding the yarn 15 to generate the package 18. The suction pipe 32 performs a catching operation of catching the yarn 15 delivered from the pneumatic spinning device 6 and moving it to a target position. The drafting device 5 includes the front roller 51 disposed at the most downstream in the fiber running direction. When the winding operation starts, the suction pipe 32 starts a catching operation for the yarn 15 generated by the pneumatic spinning device 6 while the front roller 51 rotates at the first speed. After the suction pipe 32 starts the catching operation and before the suction pipe 32 reaches the target position, the front roller 51 starts to accelerate.

[0099] Thus, compared with the case where the front roller 51 starts accelerating after the suction tube 32 reaches the target position, the time required to start the winding operation can be shortened.

[0100] The pneumatic spinning machine 1 of the present embodiment includes a yarn storage roller 81, a yarn hooking member 83, and an electric motor 82. The yarn storage roller 81 is arranged between the pneumatic spinning device 6 and the winding device 9 in the yarn travel path, and stores the yarn 15. The yarn hooking member 83 winds the yarn 15 around the yarn storage roller 81. The electric motor 82 drives the yarn storage roller 81 to rotate. When the winding action starts, after the suction pipe 32 starts the catching action and before the yarn 15 is hooked on the yarn hooking member 83, the front roller 51 starts to accelerate.

[0101] Thus, the rotation speed of the front roller 51 during yarn hooking becomes higher than the first speed. As a result, the success rate of yarn hooking can be increased compared to the case where the rotation speed of the front roller 51 is the first speed. In addition, the success rate of yarn discharge and spinning can be increased compared to the case where the rotation speed of the front roller 51 is higher than the first speed before the catching action starts.

[0102] In the pneumatic spinning machine 1 of the present embodiment, when starting the winding operation, the front roller 51 starts accelerating after the suction pipe 32 starts the catching operation, after the yarn accumulating roller 81 starts accelerating, and before the suction pipe 32 reaches the target position.

[0103] By starting the acceleration of the yarn accumulating roller 81 in advance (before the acceleration of the front roller 51), the timing at which the rotation speed of the yarn accumulating roller 81 reaches the target speed can be advanced. Therefore, even when the maximum acceleration of the yarn accumulating roller 81 is small, the time required to start the winding operation can be shortened.

[0104] In the pneumatic spinning machine 1 of the present embodiment, at the timing when the yarn 15 is hooked on the yarn hooking member 83, the front roller 51 and the yarn accumulating roller 81 are accelerated synchronously.

[0105] Thus, the yarn can be hooked even when the front roller 51 and the yarn accumulating roller 81 are in the process of accelerating.

[0106] In the pneumatic spinning machine 1 of the present embodiment, the rotation speed of the front roller 51 during the winding operation of the winding device 9 is referred to as the second speed. The rotation speed of the yarn accumulating roller 81 during the winding operation of the winding device 9 is referred to as the normal speed. When the winding operation starts, the front roller 51 increases the rotation speed to the second speed after maintaining the first speed. The yarn accumulating roller 81 continuously increases the rotation speed until it reaches the normal speed.

[0107] It is preferred that the front roller 51 rotates at a low speed during the yarn discharge spinning, but the success or failure of the yarn discharge spinning is not affected by the rotation speed of the yarn storage roller 81. Therefore, by directly increasing the rotation speed of the yarn storage roller 81 to the second speed, the success rate of the yarn discharge spinning can be improved, and the rotation speed of the yarn storage roller 81 can be brought to the normal speed in advance.

[0108] The pneumatic spinning machine 1 of the present embodiment includes a unit control section 26 for controlling at least the rotation speed of the front roller 51. The drafting device 5 includes a rear roller 54 disposed at the most upstream in the fiber running direction. After the suction pipe 32 starts the catching operation, the unit control section 26 determines whether a threshold time has passed since the rear roller 54 started rotating, and starts accelerating the front roller 51 if it is determined that the threshold time has passed.

[0109] Thereby, the timing for starting acceleration of the front roller 51 can be determined by simple control.

[0110] The air spinning machine 1 of this embodiment includes a unit control unit 26 and a detection unit 32a. The unit control unit 26 controls at least the rotation speed of the front roller 51. The detection unit 32a detects that the suction pipe 32 starts the catching action. When the winding action starts, the unit control unit 26 starts accelerating the front roller 51 after the suction pipe 32 starts the catching action and when the detection unit 32a detects that the suction pipe 32 starts the catching action.

[0111] Thereby, the start of the catching operation can be detected with high accuracy, and the acceleration of the front roller 51 can be started at a more appropriate timing.

[0112] In the pneumatic spinning machine 1 of the present embodiment, the rotation speed of the yarn accumulating roller 81 during the winding operation of the winding device 9 is referred to as the normal speed. When the winding operation starts, after the yarn 15 is hooked on the yarn hooking member 83, the yarn accumulating roller 81 maintains the normal speed, or maintains the normal speed after being accelerated to the normal speed.

[0113] Thus, the rotation speed of the yarn accumulating roller 81 is maintained at a high speed, and thus the time required to start the winding operation can be shortened.

[0114] In the air spinning machine 1 of the present embodiment, the drafting device 5 includes a plurality of drafting rollers including a front roller 51. All the drafting rollers included in the drafting device 5 are accelerated synchronously.

[0115] Thereby, the drafting roller can be accelerated while continuing the drafting of the fiber bundle 10.

[0116] The pneumatic spinning machine 1 of the present embodiment includes a piecing device 31 for joining the yarn 15 on the pneumatic spinning device 6 side captured by the suction pipe 32 with the yarn 15 on the package 18 side when the yarn 15 is broken.

[0117] Thereby, the breakage of the yarn 15 can be eliminated and the winding operation can be started.

[0118] As mentioned above, although the preferred embodiment and modification of the present invention have been described, the above-mentioned configuration may be modified as follows, for example.

[0119] 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 tension adjustment roller may be arranged at a position downstream of the delivery roller pair. In addition, a slack eliminating pipe using a suction air flow may be arranged instead of the yarn accumulating device 8.

[0120] In the above embodiment, the number of rollers constituting the drafting bottom roller group 5a is four, but this is an example. For example, one or two of the intermediate roller 52, the third roller 53, and the rear roller 54 may be omitted. Alternatively, the number of rollers constituting the drafting bottom roller group 5a may be five.

[0121] In the above embodiment, the plywood spinning machine 1 includes the plywood cart 30. However, each spinning unit 2 may include at least a part of the device related to plywood, or the plywood cart 30 may be omitted.

[0122] The flowcharts shown in the above-mentioned embodiments are merely examples, and part of the processing may be omitted, the content of part of the processing may be changed, or a new processing may be added.

[0123] In the air 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; A spinning device for twisting the fiber bundle drawn by the drawing device to generate yarn; a winding device for winding the yarn to form a package; and a catching device for catching the yarn fed from the spinning device and moving the yarn to a target position; The drafting device includes a first drafting roller, which is arranged at the most downstream in the fiber running direction. When starting the above winding action, The catching device starts the catching operation for the yarn produced by the yarn delivery spinning of the spinning device while the first drafting roller is rotating at the first speed. After the catching device starts the catching operation and before the catching device reaches the target position, the first drafting roller starts accelerating.

2. The spinning machine according to claim 1, characterized in that The above spinning machine has: a yarn storage roller, arranged between the spinning device and the winding device in the yarn travel path, and storing the yarn; A yarn hanging component, used for winding the yarn around the yarn storage roller; as well as A driving device is used to rotate and drive the yarn storage roller. When the winding operation is started, the first drafting roller starts to accelerate after the catching device starts the catching operation and before the yarn is hooked on the yarn hooking member.

3. The spinning machine according to claim 2, characterized in that: When the winding operation is started, the first drafting roller starts accelerating after the catching device starts the catching operation, after the yarn accumulating roller starts accelerating, and before the catching device reaches the target position.

4. The spinning machine according to claim 2 or 3, characterized in that: At the time when the yarn is hooked on the yarn hooking member, the first drafting roller is accelerated synchronously with the yarn accumulating roller.

5. The spinning machine according to any one of claims 2 to 4, characterized in that The rotation speed of the first drafting roller during the winding operation of the winding device is referred to as a second speed. The rotation speed of the yarn accumulating roller during the winding operation of the winding device is referred to as a normal speed. When starting the above winding action, The first drafting roller increases its rotation speed to the second speed after maintaining the first speed. The yarn accumulating roller continuously increases its rotation speed until it reaches the normal speed.

6. The spinning machine according to any one of claims 1 to 5, characterized in that The spinning machine includes a control unit that controls at least a rotation speed of the first drafting roller. The drafting device includes a second drafting roller, which is arranged at the most upstream in the fiber running direction. After the catching device starts the catching operation, the control section determines whether a threshold time has elapsed since the second draft roller started rotating, and starts accelerating the first draft roller if it is determined that the threshold time has elapsed.

7. The spinning machine according to any one of claims 1 to 5, characterized in that The above spinning machine has: a control unit that controls at least a rotation speed of the first drafting roller; and a detection unit, detecting that the capturing device starts the capturing action; When the winding operation is started, the control unit starts accelerating the first drafting roller after the catching device starts the catching operation and when the detection unit detects that the catching device starts the catching operation.

8. The spinning machine according to any one of claims 2 to 4, characterized in that The rotation speed of the yarn accumulating roller during the winding operation of the winding device is referred to as a normal speed. When the winding operation is started, after the yarn is hooked on the yarn hooking member, the yarn accumulating roller maintains the normal speed, or maintains the normal speed after being accelerated to the normal speed.

9. The spinning machine according to any one of claims 1 to 8, characterized in that The drafting device includes a plurality of drafting rollers including the first drafting roller. All the drafting rollers included in the drafting device are accelerated synchronously.

10. The spinning machine according to any one of claims 1 to 9, characterized in that The spinning machine includes a yarn joining device for joining the yarn on the spinning device side caught by the catching device with the yarn on the package side when the yarn is broken.

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