JP2014009405A - Spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinning machine including a yarn storage apparatus having a structure capable of accurately determining whether or not there is an abnormality in the spun yarn.SOLUTION: The fine spinning frame includes a spinning device, a spinning sensor, a yarn storage apparatus, a winder, and a determination part. The spinning device supplies a spun yarn. The spinning sensor is disposed downstream of the spinning device and detects tension of the spun yarn. The yarn storage apparatus is disposed downstream of the spinning sensor and temporarily stores the spun yarn. The winder is disposed downstream of the yarn storage apparatus and winds the spun yarn into a package. The determination part determines an abnormality of the spun yarn on the basis of the tension detected by the spinning sensor and a change in a winding speed that is a speed of the spun yarn wound into a package.

Description

  The present invention relates to a spinning machine that can determine an abnormality of a spun yarn based on the tension of the spun yarn.

  2. Description of the Related Art Conventionally, a spinning machine including a yarn storage device that winds a spun yarn around a rotating roller and temporarily stores the spun yarn is known. Patent document 1 discloses this kind of spinning machine.

  In the spinning machine of Patent Document 1, a yarn tension detection device that detects the tension of the spun yarn is arranged upstream of the yarn storage device in the yarn traveling direction. This yarn tension detecting device includes a wire rod and a switching member. The wire rod does not contact the spun yarn when the spun yarn is not stored in the yarn storage device. On the other hand, when the spun yarn is stored to some extent in the yarn storage device, the wire rod comes into contact with the spun yarn. Here, the force that the wire rod receives from the spun yarn increases as the storage amount of the yarn storage device increases. When the wire rod receives a force greater than a predetermined threshold value from the spun yarn (that is, when the yarn storage amount of the yarn storage device is greater than a predetermined value), the output of the switching member connected to the wire rod changes from OFF to ON. Switch. Further, when the yarn storage amount of the yarn storage device decreases after this, the output of the switching member is switched from ON to OFF.

  In this way, the spinning machine of Patent Literature 1 can determine the yarn storage amount of the yarn storage device. In addition, when it is determined that the yarn storage amount of the yarn storage device is small (when the switching member is turned OFF), the spinning machine performs control to reduce the winding speed and stores the yarn storage amount.

JP 2004-277949 A

  By the way, when the yarn storage amount of the yarn storage device is not sufficient, the tension fluctuation on the winding device side is directly transmitted to the spinning device side. In this case, the quality of the spun yarn may deteriorate. In the following description, the spun yarn whose quality is deteriorated in this way may be referred to as an abnormal yarn.

  As described above, the spinning machine of Patent Document 1 determines the yarn storage amount of the yarn storage device based only on whether the tension is equal to or greater than a threshold value. However, depending on the spinning conditions, the tension may not change much even if the yarn storage amount of the yarn storage device is lost. Therefore, in the spinning machine of Patent Document 1, it may not be possible to detect that the yarn storage amount has been lost (the possibility that abnormal yarn may be mixed into the package).

  Even when the yarn storage amount of the yarn storage device is small, the yarn storage device may be able to absorb the influence of tension fluctuation on the winding device side when the winding speed is low. However, since the spinning machine of Patent Document 1 is configured such that the spun yarn is detached from the yarn tension detecting device when the yarn storage amount is small, the tension of the spun yarn cannot be detected when the yarn storage amount is small. Therefore, the spinning machine disclosed in Patent Document 1 may perform control to reduce the winding speed even when the winding device is appropriately winding.

  As described above, Patent Document 1 cannot accurately determine whether or not there is an abnormality in the spun yarn.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a configuration capable of accurately determining whether or not there is an abnormality in a spun yarn in a spinning machine including a yarn storage device.

Means and effects for solving the problems

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

  According to an aspect of the present invention, a spinning machine having the following configuration is provided. That is, the spinning machine includes a yarn supplying unit, a detecting unit, a yarn accumulating device, a winding device, and a determining unit. The yarn supplying unit supplies spun yarn. The detection unit is disposed downstream of the yarn feeding unit in the yarn traveling direction, and detects the tension of the spun yarn. The yarn accumulating device is disposed on the downstream side in the yarn traveling direction of the detection unit, and accumulates the spun yarn. The winding device is disposed on the downstream side in the yarn traveling direction of the yarn storage device, and winds the spun yarn into a package. The determination unit determines abnormality of the spun yarn based on the tension of the spun yarn detected by the detection unit and a change in a winding speed that is a speed of the spun yarn wound around the package.

  Accordingly, whether or not the yarn storage device can absorb the tension fluctuation on the winding device side based on the correlation between the tension variation on the winding device side due to the change in the winding speed and the tension detected by the detection unit. Can be accurately grasped. Accordingly, it can be accurately determined whether or not there is an abnormality in the spun yarn.

  In the spinning machine, it is preferable that the determination unit determines abnormality of the spun yarn based on a change amount of the tension detected by the detection unit and a change in the winding speed.

  As a result, it is possible to more accurately determine whether the yarn storage device can absorb the tension fluctuation on the winding device side, so it is possible to more accurately determine whether there is an abnormality in the spun yarn.

  The spinning machine includes a contact roller that rotates in contact with the package. The determination unit determines abnormality of the spun yarn based on the tension detected by the detection unit and the rotation speed of the package or the contact roller.

  Thereby, since the change of the winding speed can be estimated from the change of the rotational speed of the package or the contact roller, the abnormality of the spun yarn can be determined based on the change.

  The spinning machine includes a traverse device that traverses the spun yarn wound around the package. The determination unit determines abnormality of the spun yarn based on the tension detected by the detection unit and the traverse speed of the traverse device.

  Thereby, since the change of the winding speed can be estimated from the change of the traverse speed of the traverse device, the abnormality of the spun yarn can be determined based on the change.

  The spinning machine preferably further includes a cycle control unit that performs cycle control for periodically changing the winding speed.

  As a result, it is possible to prevent the so-called ribbon winding, in which the spun yarns to be wound gather at the same place and overlap. In addition, since the winding speed is periodically changed, the correlation between the tension fluctuation on the winding device side and the tension detected by the detection unit can be understood more accurately, so whether or not there is an abnormality in the spun yarn. More accurate judgment can be made.

  In the spinning machine, the determination unit compares the tension detected by the detection unit with a tension one cycle before the cycle control, and determines an abnormality of the spun yarn based on the comparison result. It is preferable to do.

  As a result, it can be detected that the yarn storage device can no longer absorb fluctuations in tension on the winding device side, so that it is possible to quickly detect that an abnormality has occurred in the spun yarn.

  In the spinning machine, the determination unit determines abnormality of the spun yarn based on a difference between a maximum value and a minimum value of the tension detected by the detection unit during at least one cycle of the cycle control. It is preferable to do.

  Thereby, it is possible to accurately detect that the influence of the cycle control has appeared in the tension on the upstream side of the yarn accumulating device, and to determine the abnormality of the spun yarn. Therefore, for example, even when it is not possible to detect the moment when the yarn storage device cannot absorb the fluctuation in tension on the winding device side, the abnormality of the spun yarn can be determined.

  In the spinning machine, it is preferable that the detection unit can detect a tension independently of a yarn storage amount of the yarn storage device.

  Thereby, it is possible to determine the abnormality of the spun yarn even when the yarn storage amount of the yarn storage device is small.

  Preferably, the spinning machine further includes a winding control unit that stops at least the yarn feeding unit and the winding device when the determination unit determines that the spun yarn is abnormal.

  Thereby, it is possible to prevent the spun yarn including the abnormal yarn from being continuously wound around the package.

  The spinning machine preferably includes a notifying unit for notifying the abnormality when the determining unit determines that the spun yarn has an abnormality.

  Thereby, since it is possible to notify the operator that there is an abnormality in the spun yarn, for example, a corresponding treatment can be performed quickly.

  In the spinning machine, it is preferable that the determination unit determines whether or not the yarn storage amount of the yarn storage device is insufficient.

  Thereby, since it can be determined whether or not the yarn storage amount is insufficient, processing for increasing the yarn storage amount according to the determination result can be performed.

  In the spinning machine, it is preferable that the yarn supplying unit is an air spinning device that generates a spun yarn by twisting a fiber bundle by a swirling air flow.

  That is, since the pneumatic spinning device can perform high-speed spinning, the winding speed of the spun yarn in the winding device is also high. For this reason, the situation etc. where the yarn storage amount of the yarn storage device rapidly decreases can be considered. Therefore, the effect of the present application that the abnormality of the spun yarn can be determined based on the shortage of the yarn storage amount can be exhibited more satisfactorily.

1 is a front view showing an overall configuration of a spinning machine according to an embodiment of the present invention. The side view of a spinning unit. The block diagram which shows the electrical structure of a spinning machine. The side view which shows a mode when the yarn storage amount of a yarn storage device is little or does not exist. The graph which shows notionally the tension fluctuation | variation of the upstream of a thread | yarn storage apparatus when changing from the state with sufficient thread | yarn storage amount to the insufficient state. The flowchart which determines whether there exists abnormality in a spun yarn.

  Next, a spinning machine (spinning machine) according to an embodiment of the present invention will be described with reference to the drawings. A spinning machine 1 shown in FIG. 1 includes a large number of spinning units 2 arranged in parallel, a yarn splicing carriage 3, a prime mover box 5, a blower box 80, and a machine base control device 90.

  The machine base control device 90 is for centrally managing each component included in the spinning machine 1 and includes a monitor (notification unit) 91 and an input key 92. In addition, when the operator performs an appropriate operation using the input key 92, the settings and / or states of the specific spinning unit 2 or all the spinning units 2 can be displayed on the monitor 91.

  As shown in FIG. 2, each spinning unit 2 includes a draft device 7, a spinning device 9, a yarn accumulating device 12, and a winding device 13 that are arranged in order from upstream to downstream. . In the present specification, “upstream” and “downstream” mean upstream and downstream in the traveling direction of the fiber bundle and spun yarn during spinning. Each spinning unit 2 spins the fiber bundle 8 sent from the draft device 7 by the spinning device 9 to generate the spun yarn 10, and winds the spun yarn 10 by the winding device 13 to form the package 45. .

  The draft device 7 is provided near the upper end of the casing 6 of the spinning machine 1. The draft device 7 includes four draft rollers: a back roller 16, a third roller 17, a middle roller 19 on which a rubber apron belt 18 is mounted, and a front roller 20 in order from the upstream side. Each draft roller is rotationally driven at a predetermined rotational speed. The draft device 7 has opposing rollers arranged to face each draft roller.

  The draft device 7 sandwiches and conveys a sliver 15 supplied from a sliver case (not shown) via a sliver guide between a rotating draft roller and a counter roller opposed to the sliver 15 so as to have a predetermined width. The fiber bundle 8 is drawn (drafted) until it becomes.

  A spinning device (yarn feeding unit) 9 is disposed immediately downstream of the front roller 20. The fiber bundle 8 drafted by the draft device 7 is supplied to the spinning device 9. The spinning device 9 twists the fiber bundle 8 supplied from the draft device 7 to generate the spun yarn 10. In the present embodiment, a pneumatic spinning device that twists the fiber bundle 8 using a swirling airflow is employed. Specifically, the spinning device 9 includes a fiber guide portion, a swirl flow generation nozzle, and a hollow guide shaft body, although detailed description and illustration are omitted. The fiber guide unit guides the fiber bundle 8 sent from the draft device 7 to a spinning chamber formed inside the spinning device 9. The swirl flow generating nozzle is disposed around the path of the fiber bundle 8 and generates a swirl flow in the spinning chamber. By this swirl flow, the fiber ends of the fiber bundles 8 in the spinning chamber are reversed and swirled. The hollow guide shaft body guides the spun yarn 10 from the spinning chamber to the outside of the spinning device 9.

  A spinning sensor (detection unit) 52 and a yarn quality measuring device 57 are provided downstream of the spinning device 9. The spun yarn 10 spun by the spinning device 9 passes through the yarn quality measuring device 57 and the spinning sensor 52.

  The yarn quality measuring device 57 monitors the thickness of the traveling spun yarn 10 with a capacitance sensor (not shown). When the yarn quality measuring device 57 detects a yarn defect of the spun yarn 10 (a portion where the thickness of the spun yarn 10 is abnormal), a yarn defect detection signal is sent to the unit controller 60 (winding control unit, FIG. 3). Configured to send to. The yarn quality measuring device 57 is not limited to the capacitance type sensor, and may be configured to monitor the thickness of the yarn with a light transmission type sensor, for example. Further, the yarn quality measuring device 57 may detect foreign matter contained in the spun yarn 10 as a yarn defect.

  The spinning sensor 52 is arranged immediately downstream of the yarn quality measuring device 57. As illustrated in FIG. 4, the spinning sensor 52 includes a yarn contact portion 53 and a cover 54 that covers the yarn contact portion 53. The yarn contact portion 53 is a cylindrical member, and receives force from the spun yarn 10 at a portion having a reduced diameter (cross-sectional display portion in FIG. 4), thereby receiving force in the direction of the arrow in FIG. The force received by the yarn contact portion 53 is detected by a sensor (not shown). With this configuration, the spinning sensor 52 can detect the tension of the spun yarn 10 between the spinning device 9 and the yarn accumulating device 12. The spinning sensor 52 transmits the detected tension to the unit controller 60. The unit controller 60 detects an abnormal portion such as a weak yarn by monitoring the tension detected by the spinning sensor 52. The spinning sensor 52 of the present embodiment can detect the tension independently of the yarn storage amount of the yarn storage device 12. Accordingly, as shown in FIGS. 4A and 4B, the spinning sensor 52 applies the tension of the spun yarn 10 even when the spun yarn 10 is hardly or not stored in the yarn storage device 12. Can be detected.

  A yarn accumulating device 12 is provided downstream of the yarn quality measuring device 57 and the spinning sensor 52. As shown in FIG. 2, the yarn storage device 12 includes a yarn storage roller 14 and an electric motor 25 that rotationally drives the yarn storage roller 14.

  The yarn accumulating roller 14 can temporarily store a certain amount of spun yarn 10 around its outer peripheral surface. When the spun yarn 10 is wound around the outer peripheral surface of the yarn accumulating roller 14, the yarn accumulating roller 14 is rotated at a predetermined rotation speed, whereby the spun yarn 10 is pulled out from the spinning device 9 at a predetermined speed and conveyed downstream. can do. Moreover, since the spun yarn 10 can be temporarily stored on the outer peripheral surface of the yarn storage roller 14, the yarn storage device 12 can function as a kind of buffer. As a result, the problem that the spinning speed in the spinning device 9 and the winding speed (speed of the spun yarn 10 wound on the package 45) do not match for some reason (for example, loosening of the spun yarn 10) can be eliminated. it can.

  A yarn guide 58 and a winding device 13 are disposed downstream of the yarn storage device 12. The winding device 13 includes a cradle arm 71 supported so as to be swingable around a support shaft 73. The cradle arm 71 can rotatably support a bobbin 48 for winding the spun yarn 10.

  The winding device 13 includes a winding drum (contact roller) 72 and a traverse device 75. The winding device 13 includes a winding drum drive motor (not shown). The winding drum 72 rotates while being in contact with the outer peripheral surface of the bobbin 48 or the package 45 when the driving force of the winding drum drive motor is transmitted. The take-up drum drive motor is controlled by a motor control unit 62 (period control unit, FIG. 3). The traverse device 75 includes a traverse guide 76 that can be engaged with the spun yarn 10. While the traverse guide 76 is reciprocated by a driving means (not shown), the winding drum 72 is driven by an electric motor (not shown) to rotate the package 45 in contact with the winding drum 72 and traverse the spun yarn 10. Wind it up.

  As illustrated in FIGS. 1 and 2, the yarn joining cart 3 includes a yarn joining device 43 and a suction device (a suction pipe 44 and a suction mouth 46). When yarn breakage or yarn cut occurs in a spinning unit 2, the yarn joining cart 3 travels on the rail 41 to the spinning unit 2 and stops. The suction pipe 44 sucks and captures the yarn end sent from the spinning device 9 and guides it to the yarn joining device 43 while rotating in the vertical direction about the axis. The suction mouse 46 sucks the yarn end from the package 45 supported by the winding device 13 and guides it to the yarn joining device 43 while rotating in the vertical direction about the shaft. The yarn joining device 43 performs yarn joining between the guided yarn ends.

  Next, a configuration for determining whether or not there is an abnormality in the spun yarn 10 on the upstream side of the yarn storage device 12 will be described.

  First, the relationship between the winding speed and the tension on the winding device 13 side will be described. The winding speed in the present specification is the speed of the spun yarn 10 immediately before being wound on the package 45, and the speed roughly determined from the rotational speed of the winding drum 72 and the diameter of the package 45 is It is a different concept.

  When the winding speed is high, the spun yarn 10 is strongly pulled by the winding device 13, so that the tension of the spun yarn 10 in the vicinity of the winding device 13 increases. When the winding speed is low, the winding device 13 does not pull the spun yarn 10 too strongly, so that the tension of the spun yarn 10 in the vicinity of the winding device 13 becomes low.

  Therefore, it is possible to grasp the tension fluctuation on the winding device 13 side based on the change in the winding speed.

  Next, whether or not the spun yarn 10 on the upstream side of the yarn storage device 12 is affected by the tension fluctuation on the winding device 13 side will be described.

  As described above, the yarn storage device 12 functions as a kind of buffer. Therefore, when the yarn storage device 12 is functioning effectively (when the yarn storage amount is sufficient), the spun yarn 10 on the upstream side of the yarn storage device 12 is affected by the tension fluctuation on the winding device 13 side. Absent. In this case, the tension detected by the spinning sensor 52 basically does not change significantly.

  On the other hand, as shown in FIG. 4, when the yarn storage amount of the yarn storage device 12 is small or disappears, the yarn storage device 12 does not function effectively. It is affected by the tension fluctuation on the take-out device 13 side. In this case, the tension detected by the spinning sensor 52 is considered to show a tendency similar to the tension fluctuation on the winding device 13 side. In addition, when this large tension or a significantly fluctuating tension is applied to the spun yarn 10, an abnormal yarn may be generated.

  In addition, when there is no yarn storage amount of the yarn storage device 12, the spun yarn 10 on the upstream side of the yarn storage device 12 is surely affected by the tension fluctuation on the winding device 13 side. On the other hand, when the yarn storage amount is small, whether or not it is affected by the spinning condition or the like differs. For example, when the winding speed is low, even if the yarn storage amount is relatively small, it is not easily affected by the tension fluctuation on the winding device 13 side. Hereinafter, a state where the yarn storage amount is small enough to be influenced by the tension fluctuation on the winding device 13 side may be expressed as “the yarn storage amount is insufficient” or the like.

  As described above, in this embodiment, whether or not the yarn storage amount is insufficient (spun yarn) based on the tension detected by the spinning sensor 52 and the tension fluctuation (change in the winding speed) on the winding device 13 side. 10) whether or not an abnormality has occurred. This will be specifically described below.

  In the present embodiment, disturb control (period control) is performed in order to prevent the above-described ribbon winding from occurring. In the disturb control according to the present embodiment, the winding speed is changed by the motor control unit 62 controlling the winding drum drive motor to periodically change the rotation speed of the winding drum 72.

  When the rotation speed of the winding drum 72 is increased by disturb control, the winding speed is also increased, and the tension on the winding device 13 side is increased. When the rotational speed of the winding drum 72 is slowed by disturb control, the winding speed is also slowed and the tension on the winding device 13 side is reduced.

  When the yarn storage amount is insufficient, it is considered that the tension detected by the spinning sensor 52 varies so as to follow the speed change performed by the disturb control. FIG. 5 shows the transition of the tension detected by the spinning sensor 52 when the yarn storage amount is changed from the sufficient state to the insufficient state.

  As shown in FIG. 5, when the yarn storage amount is sufficient, the spun yarn 10 on the upstream side of the yarn storage device 12 is not affected by the tension fluctuation of the winding device 13. Accordingly, the tension detected by the spinning sensor 52 does not vary greatly.

  When the yarn storage amount is insufficient, the spun yarn 10 on the upstream side of the yarn storage device 12 is affected by the tension fluctuation of the winding device 13. Therefore, the tension detected by the spinning sensor 52 varies greatly (see FIG. 5). In this embodiment, one cycle of disturb control is configured by acceleration control for increasing the rotation speed of the winding drum 72 and deceleration control for decreasing the rotation speed of the winding drum 72. Accordingly, the tension increases when acceleration control for increasing the rotation speed is performed, and the tension decreases when deceleration control for decreasing the rotation speed is performed.

  Next, a flow of processing performed by the determination unit 61 of the unit controller 60 in order to determine whether or not there is an abnormality in the spun yarn 10 will be described. FIG. 6 is a flowchart for determining whether there is an abnormality in the spun yarn 10. In addition, this flowchart is an illustration, and as long as the effect of this invention can be exhibited, a process can be added or deleted, or the order of a process can be changed.

  For example, the determination unit 61 performs a process of obtaining a difference between the tension one cycle before the disturb control and the current tension based on the detection content of the spinning sensor 52 at predetermined time intervals. Then, it is determined whether or not the obtained difference is greater than or equal to a preset first threshold value (step S101). As shown in FIG. 5, this takes into account the point that there is a high possibility that the tension will increase significantly when the yarn storage amount is shifted from the sufficient state to the insufficient state.

  The determination unit 61 determines that there is an abnormality in the spun yarn 10 when the difference obtained in step S101 is equal to or greater than the first threshold (step S103). In the first threshold value, a value indicating a tension difference that can be generated only when the spinning sensor 52 is affected by the tension fluctuation on the winding device 13 side is set. When the difference obtained in step S101 is smaller than the first threshold value, the determination unit 61 performs the next determination process (step S102).

  In step S102, it is determined whether or not the difference between the maximum value and the minimum value during one period is equal to or greater than a second threshold value obtained in advance. This is because, as shown in FIG. 5, when the yarn storage amount is insufficient, the tension varies greatly.

  The determination unit 61 determines that the yarn storage amount is insufficient when the difference between the maximum value and the minimum value is equal to or greater than the second threshold (step S103). As the second threshold value, a value indicating a difference between the maximum value and the minimum value that can be generated only when the spinning sensor 52 is affected by the tension fluctuation on the winding device 13 side is set. When the obtained difference is smaller than the second threshold value, the determination unit 61 determines that no abnormality has occurred in the spun yarn 10 at the present time, and performs the process of step S101 again after a predetermined time.

  Thus, in this embodiment, it is determined whether abnormality has occurred in the spun yarn 10 by two types of methods. In the method of step S101, it is possible to detect immediately when the yarn storage amount is insufficient, but it is difficult to detect that after shifting to a state where the yarn storage amount is insufficient. In the method of step S102, this can be detected even after shifting to a state where the yarn storage amount is insufficient, but it may not be possible to immediately detect that the yarn storage amount is insufficient.

  Therefore, by using the method of step S101 and the method of step S102 in combination, the abnormality of the spun yarn 10 can be accurately determined.

  When the determination unit 61 determines that “an abnormality has occurred in the spun yarn 10”, the unit controller 60 notifies the user to that effect (step S104). In the present embodiment, an alarm sound is generated and the fact is displayed on the monitor 91. The notification means is not limited to this, and may be displayed on a monitor (not shown) provided for each spinning unit 2 or may be notified by lighting a lamp or the like provided for each spinning unit 2. Further, the monitor 91 or the like may notify that “the yarn storage amount of the yarn storage device 12 is insufficient” instead of or in addition to the above.

  The unit controller 60 notifies the user that “an abnormality has occurred in the spun yarn 10”, and stops the ejection of air from the air ejection nozzle of the spinning device 9 (step S105). As a result, the spinning of the spun yarn 10 in the spinning device 9 is stopped, so that the strength of the spun yarn 10 is reduced at the position of the spinning device 9 and the spun yarn 10 is cut so as to be torn off.

  The spun yarn 10 on the downstream side of the cut portion is wound around the package 45 once. At this time, the spun yarn 10 wound around the package 45 includes abnormal yarn. Therefore, the unit controller 60 stops the draft device 7 and also stops winding in the winding device 13 (step S105).

  Subsequently, the unit controller 60 sends a control signal to the yarn splicing carriage 3 to travel to the front of the spinning unit 2 where the abnormality of the spun yarn 10 is detected, and instructs a yarn splicing operation (step S106). In response to this instruction, the yarn splicing carriage 3 sucks and captures the yarn end on the spinning device 9 side and the yarn end on the package 45 side by the suction pipe 44 and the suction mouth 46. At this time, the abnormal part wound around the package 45 is sucked and pulled out by the suction mouse 46. Thereby, the detected abnormal part is removed. Subsequently, the suction pipe 44 and the suction mouth 46 guide the sucked and caught yarn end to the yarn joining device 43, and the yarn joining device 43 performs the yarn joining operation.

  With the above yarn splicing operation, the abnormal yarn is removed, and the winding of the spun yarn 10 onto the package 45 can be resumed (step S107). Further, the unit controller 60 performs the process shown in the flowchart of FIG. 5 again after resuming the winding of the spun yarn 10 to determine whether the spun yarn 10 is abnormal.

  As described above, the spinning machine 1 according to the present embodiment includes the spinning device 9, the spinning sensor 52, the yarn storage device 12, the winding device 13, and the determination unit 61. The spinning device 9 supplies the spun yarn 10. The spinning sensor 52 is disposed on the downstream side of the spinning device 9 and detects the tension of the spun yarn 10. The yarn storage device 12 is disposed on the downstream side of the spinning sensor 52 and temporarily stores the spun yarn 10. The winding device 13 is disposed on the downstream side of the yarn storage device 12 and winds the spun yarn 10 around the package 45. The determination unit 61 determines an abnormality of the spun yarn 10 based on the tension on the upstream side of the yarn storage device 12 detected by the spinning sensor 52 and the change in the winding speed.

  Thereby, the yarn storage device 12 absorbs the tension variation on the winding device 13 side based on the correlation between the tension variation on the winding device 13 side due to the change in the winding speed and the tension detected by the spinning sensor 52. Whether or not it is possible can be accurately grasped. Accordingly, it is possible to accurately determine whether or not the spun yarn 10 is abnormal.

  The spinning machine 1 of the present embodiment includes a winding drum 72 that rotates in contact with the package 45. The determination unit 61 determines abnormality of the spun yarn 10 based on the tension detected by the spinning sensor 52 and the rotation speed of the winding drum 72.

  Thereby, since the change of winding speed can be estimated from the change of the rotational speed of the winding drum 72, abnormality of the spun yarn 10 can be determined based on the change.

  In the spinning machine 1 of the present embodiment, the determination unit 61 compares the tension detected by the spinning sensor 52 with the tension one cycle before the disturb control, and based on the comparison result, Judge abnormalities.

  As a result, it is possible to detect that the yarn storage device 12 can no longer absorb fluctuations in tension on the winding device 13 side, so that it is possible to quickly detect that an abnormality has occurred in the spun yarn 10.

  Further, in the spinning machine 1 of the present embodiment, the determination unit 61 determines the amount of the spun yarn 10 based on the difference between the maximum value and the minimum value of the tension detected by the spinning sensor 52 during at least one cycle of disturb control. Judge abnormalities.

  Thereby, it is possible to accurately detect that the influence of the disturb control has appeared in the tension on the upstream side of the yarn accumulating device 12, and to determine the abnormality of the spun yarn 10. Therefore, for example, even when it is not possible to detect the moment when the yarn storage device 12 can no longer absorb the fluctuation in tension on the winding device 13 side, the abnormality of the spun yarn 10 can be determined.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  In the above-described embodiment, the disturb control is performed by changing the rotation speed of the winding drum 72. Alternatively, the disturb control may be performed by changing the traverse speed of the traverse device 75. In the case of a configuration including a motor that directly drives the package 45, disturb control can be performed by changing the rotation speed of the motor. In this case, the abnormality of the spun yarn 10 can be determined based on the rotational speed of the motor (the rotational speed of the package 45).

  In the above embodiment, the determination unit 61 performs the determination based on the change in the winding speed in the disturb control. However, instead of this, the determination unit 61 may perform the determination based on the following values. That is, for example, in the case of winding a cone winding package, if the rotational speed of the winding drum 72 is constant, the winding is performed when winding the spun yarn 10 on the large diameter side and when winding the spun yarn 10 on the small diameter side. The speed is different. The determination unit 61 may perform determination in consideration of this point.

  The detection unit that detects the tension on the upstream side of the yarn accumulating device 12 is not limited to the example shown in the above embodiment, and can be configured as shown in Patent Document 1, for example.

  The spinning device is not limited to the pneumatic spinning device 9, and the configuration of the present invention can be applied to a spinning machine including another type of spinning device.

  In the above embodiment, the determination unit 61 is provided for each spinning unit 2, but the determination unit may be provided in the machine base control device 90. In the above embodiment, the determination unit 61 and the motor control unit 62 are provided inside the unit controller 60, but may be provided separately from the unit controller 60.

  In the above embodiment, the spinning device 9, the yarn quality measuring device 57, and the spinning sensor 52 are arranged in this order from the upstream side. However, the spinning device 9, the spinning sensor 52, and the yarn quality measuring device 57 are arranged in this order. May be. However, the yarn quality measuring device 57 can be omitted.

  In the above embodiment, the spun yarn 10 is pulled out from the spinning device 9 by rotating the yarn accumulating roller 14 of the yarn accumulating device 12. Instead of this, a yarn feeding device for pulling out the spun yarn from the spinning device by inserting and rotating the spun yarn between the delivery roller and the nip roller may be provided.

  In the above embodiment, the spun yarn 10 is cut by stopping spinning of the spinning device 9 during the yarn splicing operation, but a cutter for cutting the spun yarn 10 may be provided separately.

1 Spinning machine (spinning machine)
2 Spinning unit 7 Draft device 9 Spinning device (yarn feeding unit)
10 Spinning yarn 12 Yarn storage device 13 Winding device 52 Spinning sensor (detection unit)
60 Unit controller (winding control unit)
61 determination unit 62 motor control unit (cycle control unit)

Claims (12)

A yarn supplying section for supplying spun yarn;
A detection unit that is disposed on the downstream side in the yarn running direction of the yarn feeding unit and detects the tension of the spun yarn;
A yarn storage device that is disposed downstream of the detection unit in the yarn traveling direction and stores the spun yarn;
A winding device that is disposed downstream of the yarn storage device in the yarn traveling direction and winds the spun yarn around a package;
A determination unit that determines abnormality of the spun yarn based on the tension of the spun yarn detected by the detection unit and a change in a winding speed that is a speed of the spun yarn wound around the package;
A spinning machine characterized by comprising: The spinning machine according to claim 1,
The spinning machine according to claim 1, wherein the determination unit determines abnormality of the spun yarn based on a change amount of the tension detected by the detection unit and a change in the winding speed. The spinning machine according to claim 1 or 2,
A contact roller that rotates in contact with the package;
The spinning machine according to claim 1, wherein the determination unit determines an abnormality of the spun yarn based on a tension detected by the detection unit and a rotation speed of the package or the contact roller. The spinning machine according to any one of claims 1 to 3,
A traverse device traversing the spun yarn wound around the package;
The spinning machine according to claim 1, wherein the determination unit determines an abnormality of the spun yarn based on a tension detected by the detection unit and a traverse speed of the traverse device. The spinning machine according to any one of claims 1 to 4, wherein
The spinning machine further comprising a cycle control unit that performs cycle control for periodically changing the winding speed. The spinning machine according to claim 5,
The determination unit compares the tension detected by the detection unit with a tension one cycle before the cycle control, and determines an abnormality of the spun yarn based on the comparison result. Machine. The spinning machine according to claim 5 or 6,
The determination unit determines an abnormality of the spun yarn based on a difference between a maximum value and a minimum value of the tension detected by the detection unit during at least one cycle of the cycle control. Machine. The spinning machine according to any one of claims 1 to 7,
The spinning machine according to claim 1, wherein the detection unit is capable of detecting a tension independently of a yarn storage amount of the yarn storage device. The spinning machine according to any one of claims 1 to 8,
The spinning machine further comprising a winding control unit that stops at least the yarn feeding unit and the winding device when the determination unit determines that the spun yarn is abnormal. The spinning machine according to any one of claims 1 to 9,
A spinning machine comprising: a notifying unit for notifying the abnormality when the determining unit determines that the spun yarn has an abnormality. The spinning machine according to any one of claims 1 to 10,
The spinning machine according to claim 1, wherein the determination unit determines whether the yarn storage amount of the yarn storage device is insufficient. The spinning machine according to any one of claims 1 to 11,
The spinning machine according to claim 1, wherein the yarn supplying unit is an air spinning device that generates a spun yarn by twisting a fiber bundle by a swirling air flow.

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