JP5526885B2 - Spinning unit - Google Patents

Description

  The present invention relates to a spinning unit technology. More specifically, the present invention relates to a spinning unit technology that can detect a defective portion generated in a spun yarn with high accuracy.

  Conventionally, a spinning unit is known in which a spun yarn is manufactured by twisting a drafted fiber bundle and a package is created by winding the spun yarn with a winding device. Such a spinning unit is equipped with a yarn defect detection device that can detect a defect portion generated in the spun yarn, and the yarn quality is adjusted by cutting and removing the detected defect portion. (For example, Patent Document 1).

  However, in a conventional configuration in which a yarn feeding device that feeds the manufactured spun yarn is provided and a yarn defect detecting device is arranged between the yarn feeding device and the winding device (for example, Patent Document 2), the winding device As the yarn is wound around the package while traversing the spun yarn, the yarn path of the spun yarn may change. As a result, the detection of the defect portion may be difficult due to the detection signal from the yarn defect detection device becoming unstable.

  In addition to the above-described yarn feeding device, in a conventional configuration in which a tension stabilizing device for stabilizing the tension of the spun yarn is provided, and a yarn defect detecting device is disposed between the yarn feeding device and the tension stabilizing device (for example, Patent Document 3), since the spun yarn feed speed by the yarn feed device may fluctuate, it is necessary to increase the tension applied to the spun yarn. As a result, there are cases where it becomes difficult to detect the defect portion because the feature of the defect portion generated in the spun yarn is buried. That is, since a high tension is always applied to the spun yarn spanned from the yarn feeding device to the tension stabilizing device, defects such as fuzz changes and binding defects can be detected by absorbing the characteristics by being pulled. It was difficult.

  Furthermore, in the conventional configuration in which the package is driven to rotate by driving the friction roller disposed so as to contact the package (for example, Patent Document 4), the rotational speed of the friction roller varies for some reason, There are cases where the frictional force acting between the friction roller and the package varies and the rotational speed of the package fluctuates. As a result, the tension applied to the spun yarn changes abruptly, and the spun yarn may be cut or the yarn characteristics may be changed.

JP 2000-303275 A Japanese Patent Laid-Open No. 11-268872 JP 2009-155757 A JP 2004-169264 A

  The present invention has been made to solve such a problem, and there is no possibility that the traverse of the spun yarn by the winding device will affect the detection accuracy of the defective portion by the yarn defect detecting device. An object of the present invention is to provide a spinning unit that maintains the tension moderately and stabilizes it so as to improve the detection accuracy of the defect portion by the yarn defect detection device.

  Next, means for solving this problem will be described.

That is, in the first invention, the spinning unit includes a draft device, a spinning device, a tension stabilizing device, a winding device, and a yarn defect detecting device. The draft device drafts the fiber bundle. The spinning device manufactures spun yarn from the fiber bundle drafted by the draft device. The tension stabilizing device stabilizes the tension of the spun yarn produced by the spinning device. The winding device winds the spun yarn fed from the tension stabilizing device around the package. The yarn defect detection device detects a defect portion of the spun yarn. The yarn defect detecting device is disposed between the spinning device and the tension stabilizing device. Between the spinning device and the tension stabilizing device, there is no yarn feeding device for feeding the spun yarn produced by the spinning device.

  In a second aspect based on the first aspect, the tension stabilizing device includes a roller member that winds the spun yarn and a unwinding member that unwinds the spun yarn wound around the roller member. The unwinding member stabilizes the tension applied to the spun yarn spanned from the spinning device to the tension stabilizing device by appropriately adjusting the unwinding speed of the spun yarn.

  In a third aspect based on the second aspect, the unwinding member increases the unwinding speed of the spun yarn when the tension applied to the spun yarn fed from the tension stabilizer is higher than a predetermined value. When the tension applied to the spun yarn sent from the tension stabilizer is below a predetermined value, the unwinding member reduces the unwinding speed of the spun yarn.

  In a fourth aspect based on any one of the second aspect and the third aspect, the tension stabilizing device includes a power unit that rotates the roller member. The power unit stabilizes the tension applied to the spun yarn spanned from the spinning device to the tension stabilizing device by maintaining the winding speed of the spun yarn at a predetermined value.

  According to a fifth invention, in any one of the second to fourth inventions, the tension stabilizer temporarily stores the spun yarn by appropriately adjusting the unwinding speed with respect to the winding speed of the spun yarn. .

  In a sixth aspect based on any one of the first to fifth aspects, the yarn defect detecting device detects a defect portion from the spun yarn immediately after being produced by the spinning device.

  In a seventh invention according to any one of the first to sixth inventions, the yarn defect detecting device detects a defect portion under a spinning tension by the spinning device.

  In an eighth invention according to any one of the first to seventh inventions, the yarn defect detecting device is arranged at a position where a tension applied to the spun yarn is generated only by the tension stabilizing device.

  In a ninth aspect based on any one of the first to eighth aspects, the spinning device produces a spun yarn by twisting the fiber bundle drafted by the draft device with a swirling airflow.

  As effects of the present invention, the following effects can be obtained.

  According to the first invention, the yarn path of the spun yarn in the yarn defect detection device does not change even if the winding device winds the spun yarn around the package while traversing the spun yarn. It becomes possible to detect the part stably. In addition, since the tension applied to the spun yarn spanned from the spinning device to the tension stabilizing device can be maintained moderately and stabilized, it is possible to prevent the feature of the defective portion generated in the spun yarn from being buried. As a result, it is possible to improve the accuracy of detecting the defective portion by the yarn defect detecting device, and to improve the quality of the spun yarn.

  According to the second invention, even when the tension applied to the spun yarn fed from the tension stabilizer varies, the tension applied to the spun yarn suspended from the spinning device to the tension stabilizer is affected. Can be prevented. As a result, it is possible to improve the accuracy of detecting the defective portion by the yarn defect detecting device, and to improve the quality of the spun yarn.

  According to the third invention, even when the tension applied to the spun yarn fed from the tension stabilizer increases, it affects the tension applied to the spun yarn spanned from the spinning device to the tension stabilizer. Can be prevented. Further, even when the tension applied to the spun yarn sent out from the tension stabilizer is reduced, it is possible to prevent an influence on the tension applied to the spun yarn spanned from the spinning device to the tension stabilizer. As a result, it is possible to improve the accuracy of detecting the defective portion by the yarn defect detecting device, and to improve the quality of the spun yarn.

  According to the fourth invention, since the winding speed of the spun yarn around the roller member can be kept constant, the tension applied to the spun yarn spanned from the spinning device to the tension stabilizing device can be kept moderate and stabilized. It becomes possible. Further, since the spun yarn is wound around the roller member a plurality of times, the contact length between the roller member and the spun yarn can be ensured, and the spun yarn can be prevented from slipping. As a result, it is possible to improve the accuracy of detecting the defective portion by the yarn defect detecting device, and to improve the quality of the spun yarn.

  According to the fifth aspect of the present invention, even if the tension applied to the spun yarn sent from the tension stabilizer increases, the spun yarn that is wound around the roller member and sent from the spun yarn is sent out. It is possible to prevent the tension applied to the spun yarn hung on the stabilizer from being affected. Further, even when the tension applied to the spun yarn sent out from the tension stabilizer is reduced, the spun yarn is wound around the roller member and stored on the spun yarn stretched from the spinning device to the tension stabilizer. It is possible to prevent the influence on the tension. As a result, it is possible to improve the accuracy of detecting the defective portion by the yarn defect detecting device, and to improve the quality of the spun yarn.

  According to the sixth aspect of the present invention, it is possible to detect a defective portion before the spun yarn produced by the spinning device is affected by contact with other members. As a result, it is possible to improve the accuracy of detecting the defective portion by the yarn defect detecting device, and to improve the quality of the spun yarn.

  According to the seventh aspect of the invention, the yarn defect detection device can appropriately detect the spinning state of the spinning device. As a result, it is possible to improve the accuracy of detecting the defective portion by the yarn defect detecting device, and to improve the quality of the spun yarn.

  According to the eighth aspect of the invention, the tension applied to the spun yarn in the yarn defect detection device can be appropriately maintained and stabilized, so that it is possible to prevent the feature of the defective portion generated in the spun yarn from being buried. As a result, it is possible to improve the accuracy of detecting the defective portion by the yarn defect detecting device, and to improve the quality of the spun yarn.

  According to the ninth aspect of the present invention, the spun yarn from the spinning device is stably fed, and the tension applied to the spun yarn in the yarn defect detecting device can be kept moderate and stable. Can be prevented from being buried. As a result, it is possible to improve the accuracy of detecting the defective portion by the yarn defect detecting device, and to improve the quality of the spun yarn.

The figure which shows the spinning machine 100 provided with two or more spinning units. The figure which shows the whole structure of the spinning unit. The figure which shows the spinning apparatus 6 provided in the spinning unit 1. FIG. The figure which shows the yarn fault detection apparatus 7 provided in the spinning unit 1. FIG. The figure which shows the tension stabilizer 8 provided in the spinning unit 1. FIG. Schematic which shows the whole structure of the yarn joining apparatus 12. The figure which shows the whole 1st spinning unit 2 whole structure. (8A) The figure which shows the detection signal of the yarn defect detection apparatus 7 which excluded the disturbance. (8B) A diagram showing a detection signal of the yarn defect detecting device 7 constituting the conventional first spinning unit 2. FIG. The figure which shows the whole structure of the conventional 2nd spinning unit 3. FIG. (10A) The figure which shows the detection signal of the yarn fault detection apparatus 7 which excluded the disturbance. (10B) A diagram showing a detection signal of the yarn defect detection device 7 constituting the conventional second spinning unit 3. FIG. The figure which shows the detection signal of the yarn defect detection apparatus 7 which comprises the spinning unit 1. FIG.

  A spinning machine 100 including a plurality of spinning units 1 according to an embodiment of the present invention will be described with reference to FIG.

  The spinning machine 100 is provided with a plurality of spinning units 1 for producing spun yarn Y from a fiber bundle (hereinafter referred to as “sliver”) F, and controls the yarn splicing carriage 11, the driving device, and other operations. A control device is provided.

  In order to improve the quality of the spun yarn Y in such a spinning machine 100, it is required that the spun yarn Y manufactured by one spinning unit 1 can stably ensure a certain quality. Each spun yarn Y produced by each spinning unit 1 is required to be able to ensure a certain quality on average.

  For this reason, the spinning machine 100 is manufactured in each spinning unit 1 while confirming that the standard deviation of the yarn thickness of the spun yarn Y manufactured in one spinning unit 1 satisfies a predetermined standard. In addition, it is confirmed that the standard deviation of the average yarn thickness of each spun yarn Y satisfies a predetermined standard. The SD value, which is the standard deviation of the thread thickness, is expressed as follows.

  In addition, M in the formula is an average value of the yarn thickness of the spun yarn Y and is expressed below.

  In order to confirm the quality of the spun yarn Y by such a formula and create the package 91 from which the defective portion is eliminated, it is necessary to accurately measure the thickness of the spun yarn Y. Therefore, the detection accuracy of the yarn defect detection device 7 that detects the defect portion by measuring the thickness of the spun yarn Y becomes important.

  The defective portion of the spun yarn Y refers to a portion where the spun yarn Y has an abnormal thickness. For example, the thick yarn portion D1 is a portion that is a predetermined ratio or more with respect to the yarn count that is the target value of the spun yarn Y, and the thin yarn is a portion that is equal to or less than the predetermined proportion with respect to the yarn count that is the target value of the spun yarn Y This is defined as part D2.

  First, the overall configuration of the spinning unit 1 according to the embodiment of the present invention will be described with reference to FIGS. 2, 3, 4, and 5.

  In the spinning unit 1, along the feeding direction of the sliver F and the spun yarn Y, the sliver supply unit 4, the draft device 5, the spinning device 6, the yarn defect detecting device 7, the tension stabilizing device 8, and the winding device. 9 are arranged in this order. The sliver supply unit 4 mainly supplies the stored sliver F. The draft device 5 makes the thickness uniform by drafting the sliver F. The spinning device 6 produces the spun yarn Y by twisting the sliver F. The yarn defect detecting device 7 detects the defect portion by measuring the thickness of the spun yarn Y. The tension stabilizing device 8 stabilizes the tension applied to the spun yarn Y. The winding device 9 winds the spun yarn Y around the package 91 while traversing.

  The sliver supply unit 4 includes a sliver case 41 that stores a sliver F that is a raw material of the spun yarn Y, and a sliver guide (not shown) that guides the sliver F to the draft device 5.

  The draft device 5 includes a plurality of draft roller pairs that draft and send out the sliver F. The spinning unit 1 includes four pairs of draft rollers, and a back roller pair 51, a third roller pair 52, a middle roller pair 53, and a front roller pair 54 are arranged along the feeding direction of the sliver F. Has been placed.

  The four pairs of draft rollers 51, 52, 53, and 54 are arranged so as to be in contact with the bottom rollers 51A, 52A, 53A, and 54A rotated by a driving source (not shown) and the bottom rollers 51A, 52A, 53A, and 54A. And top rollers 51B, 52B, 53B, and 54B that are driven to rotate. Further, the bottom rollers 51A, 52A, 53A, and 54A constituting the draft roller pairs 51, 52, 53, and 54 are rotated in the same direction, and the top rollers 51B, 52B, 53B, and 54B that are driven and rotated are also other tops. It is assumed that it rotates in the same direction as the roller.

  Thus, the sliver F sandwiched between the bottom rollers 51A, 52A, 53A, and 54A and the top rollers 51B, 52B, 53B, and 54B is sent out according to the rotation of the draft roller pairs 51, 52, 53, and 54. Further, each of the draft roller pairs 51, 52, 53, and 54 is set so that the rotation speed is sequentially increased along the feeding direction of the sliver F.

  With this configuration, the sliver F increases in speed each time it passes through each draft roller pair 51, 52, 53, 54, and is drafted between adjacent pairs of draft rollers. is there.

  The spinning device 6 is an air spinning device that manufactures the spun yarn Y by twisting the sliver F drafted by the draft device 5 with a swirling airflow. As shown in FIG. 3, the spinning device 6 includes a guide member 61 to which the sliver F drafted mainly by the draft device 5 is supplied, and a spindle member 63 constituting a spinning chamber 62 between the guide member 61. And a nozzle member 64 that is externally fitted with a predetermined gap between the spindle member 63 and the spindle member 63. In addition, the arrow shown in the figure has shown the feed direction of the sliver F and the spun yarn Y, and the flow direction of the supplied air.

  The guide member 61 is a member that constitutes a part of the spinning chamber 62, and guides the sliver F drawn by the draft device 5 to the spinning chamber 62. In FIG. 3, the needle-like member is provided on the guide member 61, but the function may be realized by the downstream end portion of the guide member 61 without providing the needle-like member.

  The spinning chamber 62 includes a substantially cylindrical space 62a provided between the guide member 61 and the spindle member 63, and a substantially annular space 62b provided in the gap between the spindle member 63 and the nozzle member 64. It is a configured space. The substantially cylindrical space 62 a that constitutes the spinning chamber 62 is a space that inverts a part of each fiber that constitutes the sliver F (see the two-dot chain line), and is a substantially annular space 62 b that constitutes the spinning chamber 62. Is a space for swirling the inverted fiber along the air flow (see the two-dot chain line).

  The spindle member 63 is a member that constitutes a part of the spinning chamber 62, and feeds the spun yarn Y that is twisted in the spinning chamber 62. The spindle member 63 is provided with a yarn passage 63a so as to communicate with the spinning chamber 62, and the spun yarn Y is sent out from the yarn passage 63a.

  The nozzle member 64 is a member that constitutes a part of the spinning chamber 62, and generates a swirling airflow inside the spinning chamber 62. The nozzle member 64 is provided with a plurality of air injection holes 64 a so as to communicate with the spinning chamber 62. When air is injected through the air injection holes 64 a, a swirling airflow is generated inside the spinning chamber 62. Occur.

  With such a configuration, a part of each fiber constituting the sliver F can be reversed and swirled (refer to a two-dot chain line) by the swirling airflow, and the spun yarn Y thus twisted is sent out from the spinning device 6. It is. And, since the sliver F is twisted by the airflow instead of twisting the sliver F with a mechanical configuration, the delivery of the spun yarn Y is stabilized, and the tension applied to the spun yarn Y sent out is kept moderate. , Can be stabilized. That is, since the spinning device 6 does not mechanically hold the sliver F and generates tension in the spun yarn by the resistance between the air flow and the fiber, the so-called spinning tension is stably maintained at a constant level.

  The yarn defect detecting device 7 includes a light source unit 71, a light receiving unit 72, a casing member 73, and a guide member 74 (see FIG. 2). The light source unit 71 irradiates the spun yarn Y with light. The light receiving unit 72 receives light emitted from the light source unit 71. The casing member 73 holds the light source unit 71 and the light receiving unit 72. The guide member 74 regulates the yarn path of the spun yarn Y. In addition, the arrow shown in the figure has shown the direction of the light irradiated from the light source part 71. FIG.

  The light source unit 71 is a light emitting diode that emits light by applying a voltage in the forward direction. The light emitting diode is a semiconductor element that emits light by an electroluminescence effect, and is arranged so that the spun yarn Y can be irradiated with light.

  The light receiving unit 72 is a phototransistor that allows current to be controlled by an optical signal. A phototransistor is a semiconductor element that makes it possible to control the collector current of a transistor by the amount of received light. The light receiving unit 72 is disposed so as to receive light emitted from the light source unit 71. The light receiving unit 72 outputs an electric signal corresponding to the received light amount as a detection signal.

  The casing member 73 is a member that holds the light source unit 71 and the light receiving unit 72 at predetermined positions. The casing member 73 is provided with a yarn passage 73a through which the spun yarn Y passes, and the light source unit 71 and the light receiving unit 72 are arranged so as to face each other with the spun yarn Y interposed therebetween.

  The guide member 74 is a yarn hooking member that regulates the yarn path of the spun yarn Y to a predetermined position. The guide members 74 are provided on the upstream side and the downstream side of the casing member 73, respectively, and stabilize the yarn path in the yarn defect detecting device 7 (see FIG. 2).

  With such a configuration, the amount of light received by the light receiving unit 72 is a value that excludes the amount of light shielded by the spun yarn Y from the light emitted from the light source unit 71 to the spun yarn Y. Thereby, the yarn defect detecting device 7 can measure the yarn thickness of the spun yarn Y from the amount of light received by the light receiving unit 72. Furthermore, the yarn defect detection device 7 can detect the defect portion of the spun yarn Y by measuring the amount of received light that changes according to the yarn thickness.

  The tension stabilizer 8 keeps the tension applied to the spun yarn Y moderately and stabilizes it. As shown in FIG. 5, the tension stabilizer 8 mainly includes a roller member 81 that winds the spun yarn Y, a power unit 82 that rotates the roller member 81, and a spun yarn Y that is wound around the roller member 81. And a unwinding member 83 for unwinding. In addition, the arrow shown in the figure has shown the feed direction of the spun yarn Y. FIG.

  The roller member 81 is a substantially cylindrical rotating body that winds the spun yarn Y by rotating. The roller member 81 is attached to a rotating shaft 82 a of the power unit 82 and is driven to rotate by the power unit 82. The spun yarn Y guided to the tension stabilizing device 8, that is, the spun yarn Y guided to the roller member 81 is wound around the outer peripheral surface of the roller member 81. As a result, the spun yarn Y wound around the roller member 81 a plurality of times has a long contact length with the roller member 81 and can prevent slippage.

  The roller member 81 will be described in more detail. The outer peripheral surface of the roller member 81 is a distal end from the proximal end side, assuming that the side having the unwinding member 83 is the distal end side and the side where the power unit 82 is disposed is the proximal end side. A proximal end tapered portion, a cylindrical portion, and a distal end side tapered portion are provided in order toward the side.

  The cylindrical portion is configured to have a shape in which the tip end side is slightly narrowed, and has a shape that is continuous without a step with respect to the tapered portions on both sides. In order to obtain a sufficient conveying force of the spun yarn Y by the roller member 81, it is preferable that the spun yarn Y is wound around the outer peripheral surface of the roller member 81 without overlapping the spun yarn Y. For this reason, the roller member 81 is formed in a dimension that can store the spun yarn Y for at least 10 rounds or more. Further, a yarn storage sensor (not shown) is provided so as to face the roller member 81. The storage amount of the spun yarn Y wound around the roller member 81 is detected and transmitted to a unit controller (not shown).

  Each of the proximal end side taper portion and the distal end side taper portion is formed in a gentle taper shape having the end face side as a large diameter side. On the outer peripheral surface of the roller member 81, the proximal side taper portion smoothly moves the supplied spun yarn Y from the large diameter portion toward the small diameter portion to reach the intermediate cylindrical portion, thereby allowing the spun yarn Y to reach the intermediate cylindrical portion. It is neatly wrapped around the surface of the cylindrical part. Further, the tip side taper portion has a function of preventing a loop-out phenomenon in which the spun yarn Y wound around at the time of unwinding is pulled out at a time. Further, the tip side taper portion has a function of rewinding the spun yarn Y from the small-diameter portion to the large-diameter portion on the end face side in order to ensure smooth drawing of the spun yarn Y.

  The power unit 82 is an electric motor that is driven by being supplied with electric power. The power unit 82 rotates the roller member 81 and maintains the rotation speed of the roller member 81 at a predetermined value. Thereby, the winding speed of the spun yarn Y around the roller member 81 can be kept constant.

  The unwinding member 83 is a yarn hooking member that assists in unwinding the spun yarn Y wound by rotating integrally or independently with the roller member 81. One end of the unwinding member 83 is attached to a rotating shaft 84 provided on the central axis of the roller member 81, and the other end is formed so as to curve toward the outer peripheral surface of the roller member 81. Yes. The unraveling member 83 can guide the spun yarn Y to the outer peripheral surface of the roller member 81 by applying the spun yarn Y to the curved portion. The base of the rotating shaft 84 to which the unraveling member 83 is attached has a resistance against relative rotation by a permanent magnet attached to either the rotating shaft 84 or the roller member 81 and a magnetic hysteresis material attached to the other. Torque is generated. The method for applying the resistance torque between the unwinding member 83 and the roller member 81 is not limited to such a magnetic mechanism, and for example, a frictional force or an electromagnetic mechanism may be used.

  As a result, the unwinding member 83 has a low tension applied to the spun yarn Y fed from the tension stabilizing device 8, that is, the spun yarn Y unwound from the roller member 81, and can overcome the resistance torque described above. It rotates integrally with the roller member 81. The unwinding member 83 winds the spun yarn Y hung on the unwinding member 83 around the roller member 81. Thus, since the tension stabilizing device 8 performs the operation of winding the spun yarn Y using the unwinding member 83 while unwinding the spun yarn Y from the roller member 81, the unwinding speed can be reduced. is there.

  On the other hand, the unwinding member 83 has a high tension applied to the spun yarn Y fed from the tension stabilizing device 8, that is, the spun yarn Y unwound from the roller member 81, and in the case of overcoming the resistance torque described above, the roller member Rotates independently from 81. The unwinding member 83 unwinds the spun yarn Y wound around the roller member 81 by the unwinding member 83. In this way, the tension stabilizing device 8 performs the operation of unwinding the spun yarn Y using the unwinding member 83 while unwinding the spun yarn Y from the roller member 81, and therefore, the unwinding speed is increased. Can do it.

  Further, since the tension stabilizing device 8 can adjust the unwinding speed as described above with respect to the winding speed of the spun yarn Y around the roller member 81, the spun yarn Y is placed on the outer peripheral surface of the roller member 81. Can be temporarily stored in a wound state.

  As a result, when the tension applied to the spun yarn Y sent out from the tension stabilizer 8, that is, the spun yarn Y unwound from the roller member 81, increases, the spun yarn wound around the roller member 81 and stored. Y can be sent out. Further, when the tension applied to the spun yarn Y delivered from the tension stabilizing device 8, that is, the spun yarn Y unwound from the roller member 81, is reduced, the spun yarn Y is wound around the roller member 81 and stored. It can be done.

  With such a configuration, even if the tension applied to the spun yarn Y fed from the tension stabilizer 8, that is, the spun yarn Y unwound from the roller member 81, varies from the spinning device 6 to the tension stabilizer. Thus, it is possible to prevent the tension applied to the spun yarn Y hung on the belt 8 from being affected.

  The winding device 9 forms a substantially cylindrical package 91 by winding the spun yarn Y while traversing in the axial direction of the bobbin 92. The package 91 or the bobbin 92 is driven and rotated by receiving the driving force of the friction roller 93 to wind the spun yarn Y around the outer peripheral surface.

  As described above, the spinning unit 1 makes the thickness uniform by drafting the sliver F as a raw material, and produces the spun yarn Y by twisting the drafted sliver F. Then, the spinning unit 1 creates the package 91 by winding the spun yarn Y manufactured in this way.

  As described above, in the spinning unit 1, the tension stabilizing device 8 is arranged on the downstream side of the yarn defect detecting device 7, so that even if the winding device 9 winds the spun yarn Y while traversing, the spun yarn Y It is possible to absorb changes in the yarn path. Further, for example, even when the friction roller 93 included in the winding device 9 changes its rotational speed, it is possible to absorb a change in tension applied to the spun yarn Y. In this way, the yarn path of the spun yarn Y hung from the spinning device 6 to the tension stabilizing device 8 can be stabilized, and the tension applied to the spun yarn Y can be kept moderate and stabilized. As a result, the spinning unit 1 can improve the detection accuracy of the defect portion by the yarn defect detection device 7.

  Here, the reason why the quality of the spun yarn Y can be improved by improving the detection accuracy of the defective portion by the yarn defect detecting device 7 will be described.

  As described above, the yarn defect detection device 7 is capable of detecting a defect portion of the spun yarn Y by measuring the amount of received light that changes in accordance with the yarn thickness. The yarn defect detection device 7 is provided with a cutting device (not shown), and immediately cuts the spun yarn Y when the defect portion is detected. Thereafter, the cut spun yarn Y is cut and removed from the defective portion, and then spun together by the yarn splicing device 12 and wound as a single spun yarn Y again.

  That is, when the yarn defect detecting device 7 misses the defective portion of the spun yarn Y, the package 91 is created by the spun yarn Y including the defective portion, and the portion where the yarn defect detecting device 7 is not the defective portion is defective. If it is erroneously determined that it is a part, cutting and splicing that were originally unnecessary are performed. For this reason, the improvement in the accuracy of detecting the defective portion by the yarn defect detecting device 7 is important for improving the quality of the spun yarn Y. Further, the improvement in the accuracy of detecting the defective portion by the yarn defect detecting device 7 is important for improving the productivity of the spun yarn Y.

  The operation of the spinning unit 1 when the yarn defect detection device 7 detects a defect portion will be described. When the unit controller (not shown) receives the yarn defect detection signal from the yarn defect detector 7, the unit controller immediately cuts the spun yarn Y by a cutting device (not shown) provided immediately upstream of the yarn defect detector 7, and further the draft device 5. And the spinning device 6 and the like are stopped. Further, the unit controller transmits a control signal to the yarn splicing carriage 11 to travel to the spinning unit 1 where the spun yarn Y has been cut. Thereafter, the unit controller activates the spinning device 6 again and causes the yarn joining device 12 of the yarn joining cart 11 to perform the yarn joining operation. After completing the yarn splicing operation, the unit controller restarts the winding operation in the spinning unit 1.

  The yarn joining cart 11 includes a yarn joining device 12, a suction pipe 13, and a suction mouth 14 (see FIG. 1). When yarn breakage or yarn breakage occurs in a spinning unit 1, the yarn splicing carriage 11 travels on a rail (not shown) provided at the lower part of the spinning machine 100 to the spinning unit 1 and stops. The suction pipe 13 sucks and captures the yarn end fed from the spinning device 6 while rotating in the vertical direction about the shaft and guides it to the yarn joining device 12. The suction mouse 14 sucks and captures the yarn end from the package 91 supported by the winding device 9 while rotating in the vertical direction about the shaft, and guides it to the yarn joining device 12. The yarn joining device 12 performs the yarn joining operation between the yarn ends thus guided.

  Below, the whole structure of the yarn joining apparatus 12 is demonstrated using FIG. In addition, the arrow shown in the figure has shown the movable direction of each member which comprises the yarn splicing apparatus 12. FIG.

  The yarn joining device 12 mainly includes a first untwisting nozzle 121 for untwisting the yarn end YT on the tension stabilizing device 8 side (see the dashed line in the figure) and a yarn end YW on the winding device 9 side (in the figure). A second untwisting nozzle 122 for untwisting, a yarn splicing nozzle 123 for intertwining and twisting both untwisted and loosened yarn ends YT and YW, and both yarn ends YT and YW respectively. A pair of yarn shifting levers 124 arranged at predetermined positions, a first yarn end cutter 125a for cutting the yarn end YT on the tension stabilizing device 8 side, and a second for cutting the yarn end YW on the winding device 9 side. A yarn end cutter 125b and a pair of yarn holding levers 127 that are fixed when the yarn ends YT and YW are joined together are configured.

  The first untwisting nozzle 121 sucks the yarn end YT on the tension stabilizing device 8 side and performs untwisting. The first untwisting nozzle 121 includes a first untwisting pipe 121b with the first suction port 121a exposed, and the first untwisting pipe 121b injects untwisting air therein. 221 is communicated with. The untwisting air flow path 221 is communicated with the first untwisted pipe 121b in the vicinity of the first suction port 121a so as to be inclined in the axial direction of the first untwisted pipe 121b. Thus, the first untwisting nozzle 121 sucks the yarn end YT from the first suction port 121a by the untwisting air injected from the untwisting air passage 221, and is formed in the first untwisting pipe 121b. The fiber is untwisted by a spiral flow.

  The second untwisting nozzle 122 sucks the yarn end YW on the winding device 9 side and performs untwisting. The second untwisting nozzle 122 includes a second untwisting pipe 122b in which the second suction port 122a is exposed, and the second untwisting pipe 122b injects untwisting air therein. 222 is communicated. The untwisting air flow path 222 is communicated with the second untwisted pipe 122b in the vicinity of the second suction port 122a so as to be inclined in the axial direction of the second untwisted pipe 122b. As a result, the second untwisting nozzle 122 sucks the yarn end YW from the second suction port 122a by the untwisting air injected from the untwisting air passage 222 and is formed in the second untwisting pipe 122b. The fiber is untwisted by a spiral flow.

  The yarn splicing nozzle 123 entangles the yarn end YT on the tension stabilizing device 8 side untwisted and loosened with the yarn end YW on the winding device 9 side unwound and loosened. The yarn joining nozzle 123 includes a storage portion 123a for storing the yarn end YT on the tension stabilizing device 8 side and a yarn end YW on the winding device 9 side, and a guide inclined portion for guiding both the yarn ends YT and YW to the storage portion 123a. 123b is formed. Further, the yarn joining nozzle 123 is communicated with a yarn joining air passage 223 for injecting yarn joining air therein. As a result, the yarn joining nozzle 123 forms a swirling flow in the accommodating portion 123a by the yarn joining air jetted from the yarn joining air passage 223, and entangles the two yarn ends YT and YW that have been untwisted and loosened. They are spliced together.

  The yarn shifting lever 124 is arranged to place the yarn end YT on the tension stabilizing device 8 side and the yarn end YW on the winding device 9 side at respective predetermined positions. The yarn shifting levers 124 are arranged to face each other with the yarn joining nozzle 123 interposed therebetween, and are respectively moved by a driving device (not shown). Before the untwisting operation, the yarn shifting lever 124 moves to move the tips of both yarn ends YT and YW to a predetermined position of the yarn joining nozzle 123. Further, after the untwisting operation, the yarn shifting lever 124 is further moved to an appropriate position, so that the untwisted portions of both yarn ends YT and YW are arranged at predetermined positions in the accommodating portion 123a.

  The first yarn end cutter 125a cuts the yarn end YT to an appropriate length before untwisting the yarn end YT on the tension stabilizer 8 side. Further, the second yarn end cutter 125b cuts the yarn end YW to an appropriate length before unwinding the yarn end YW on the winding device 9 side. The yarn end YT cut by the first yarn end cutter 125a is fixed by the first clamp plate 126a, and the yarn end YW cut by the second yarn end cutter 125b is fixed by the second clamp plate 126b. .

  The yarn holding lever 127 fixes the yarn ends YT and YW after the untwisted portions of the yarn ends YT and YW are arranged at predetermined positions in the accommodating portion 123a by the yarn shifting lever 124. The yarn holding lever 127 is moved along the both side surfaces of the yarn joining nozzle 123 by a driving device (not shown). The yarn presser lever 127 fixes both the yarn ends YT and YW so as to be sandwiched between the yarn presser lever 127 and the yarn joining nozzle 123. Thereafter, as described above, the yarn joining air is injected into the yarn joining nozzle 123, and the yarn ends YT and YW are entangled and joined together.

  In the present embodiment, the yarn joining device 12 is provided in the yarn joining cart 11, but the yarn joining device 12 may be provided in each spinning unit 1. The yarn joining device 12 may be any device that can join the yarn end on the spinning device 6 side and the yarn end on the winding device 9 side, and is not limited to the above configuration.

  The above is the overall configuration of the spinning unit 1 and the yarn joining device 12 according to the embodiment of the present invention. Next, in order to show the superiority of the detection accuracy of the yarn defect detection device 7 in the spinning unit 1, the conventional first spinning unit 2 and the conventional second spinning unit 3 will be described. However, the same components as those in the spinning unit 1 described above are denoted by the same reference numerals, and different portions will be mainly described.

  FIG. 7 is a diagram showing an overall configuration of a conventional first spinning unit 2. In the first spinning unit 2, along the feeding direction of the sliver F and the spun yarn Y, the sliver supply unit 4, the draft device 5, the spinning device 6, the yarn feeding device 10, the yarn defect detecting device 7, and the winding The take-out devices 9 are arranged in this order. The sliver supply unit 4 mainly supplies the stored sliver F. The draft device 5 makes the thickness uniform by drafting the sliver F. The spinning device 6 produces the spun yarn Y by twisting the sliver F. The yarn feeding device 10 sends out the manufactured spun yarn Y. The yarn defect detecting device 7 detects the defect portion by measuring the thickness of the spun yarn Y. The winding device 9 winds the spun yarn Y around the package 91 while traversing.

  The yarn feeding device 10 feeds the spun yarn Y manufactured by the spinning device 6 to the winding device 9. The yarn feeder 10 includes a delivery roller 101, a nip roller 102, and the like. The spun yarn Y sandwiched between the delivery roller 101 and the nip roller 102 is sent out according to the rotation of the delivery roller 101 and the nip roller 102.

  Further, the conventional first spinning unit 2 is not provided with the tension stabilizing device 8 as a part different from the spinning unit 1 according to the embodiment of the present invention, and the yarn defect detecting device 7 is provided with the yarn feeding device 10 and the winding device 9. It is arranged between. Thereby, the yarn defect detecting device 7 is configured to detect the defect portion before the spun yarn Y fed from the yarn feeding device 10 reaches the winding device 9.

  However, when the spun yarn Y is wound around the package 91 by the winding device 9, the spun yarn Y needs to be wound while traversing. In the conventional configuration as described above, there are cases in which the defect defect detection accuracy by the yarn defect detection device 7 is affected.

  Specifically, the winding device 9 may change the yarn path of the spun yarn Y in the yarn defect detecting device 7 in order to wind the spun yarn Y around the package 91 while traversing the bobbin 92 in the axial direction. . As a result, it may be difficult to detect the defective portion due to the instability of the detection signal caused by the change in the yarn path of the spun yarn Y.

  Further, the winding device 9 of the conventional first spinning unit 2 rotates the package 91 by rotating the friction roller 93. Therefore, for example, when the rotational speed of the friction roller 93 varies, the tension applied to the spun yarn Y may be changed. As a result, it may be difficult to detect the defective portion due to the instability of the detection signal of the yarn defect detecting device 7 due to the change in the tension of the spun yarn Y.

  Here, the problem that it becomes difficult to detect the defective portion due to the destabilization of the detection signal of the yarn defect detecting device 7 due to the change in the yarn path and tension of the spun yarn Y will be described in detail with reference to FIG. To do.

  FIG. 8A is a diagram illustrating a detection signal when the yarn defect detection device 7 from which disturbance is excluded is used, and FIG. 8B is a diagram illustrating a detection signal of the yarn defect detection device 7 constituting the spinning unit 2. . Note that the elimination of disturbance means a state in which all disturbances that affect the detection accuracy of the yarn defect detection device 7 such as traverse of the spun yarn Y by the winding device 9 are eliminated.

  The horizontal axes of FIGS. 8A and 8B indicate the passage of time from a predetermined time. That is, an arbitrary position in the length direction of the spun yarn Y passing through the yarn defect detecting device 7 is shown. 8A and 8B indicate voltage values that are detection signals from the light receiving unit 72 that constitutes the yarn defect detecting device 7. That is, the yarn thickness of the spun yarn Y detected by the yarn defect detection device 7 is shown. The voltage value VA shown in the figure corresponds to the average thread thickness, the voltage value VA-h corresponds to the allowable upper limit thread thickness, and the voltage value VA-l corresponds to the allowable lower limit thread thickness.

  That is, FIG. 8A and FIG. 8B show changes in the yarn thickness obtained by connecting the yarn thicknesses of the spun yarn Y measured at predetermined intervals in the length direction of the spun yarn Y passing through the yarn defect detecting device 7. FIG. Then, it shows that the thick yarn portion D1 exists in the portion where the yarn thickness of the spun yarn Y exceeds the allowable upper limit yarn thickness, and the thin yarn portion D2 exists in the portion where the yarn thickness of the spun yarn Y exceeds the allowable lower limit yarn thickness. Show.

  FIG. 8A shows the change in the yarn thickness measured in a state in which all disturbances are excluded, so it can be assumed that the yarn thickness of the spun yarn Y without error is captured. From FIG. 8A, there is a thick yarn portion D1 that is a portion exceeding the allowable upper limit yarn thickness at the position L1 of the spun yarn Y, and a thin yarn that is a portion exceeding the allowable lower limit yarn thickness at the position L2 of the spun yarn Y. It can be seen that the part D2 exists.

  On the other hand, FIG. 8B shows changes in the yarn thickness measured by the yarn defect detection device 7 constituting the spinning unit 2. For this reason, in FIG. 8B, a relatively large variation in the detection signal due to a change in the yarn path of the spun yarn Y and a change in the tension in the yarn defect detection device 7 is included. This is because the amount of light received by the light receiving portion 72 has changed due to changes in the yarn path and tension of the spun yarn Y, and the actual change in the yarn thickness as shown in FIG. 8B has not occurred. Absent.

  8B, it is determined that the thick yarn portion D1 is present at the position L1 of the spun yarn Y because it exceeds the allowable upper limit yarn thickness. However, at the position L2 of the spun yarn Y, the allowable lower limit yarn is determined. Since the thickness is not exceeded, it is not determined that the thin yarn portion D2 is present, and the detection signal of the true defect portion is overlooked.

  This is due to the fact that the yarn path in the yarn defect detection device 7 has changed at the position L2 of the spun yarn Y or the tension of the spun yarn Y has changed, and is thus determined to be thicker than the actual yarn thickness of the thin yarn portion D2. This is because the signal is output from the yarn defect detecting device 7. As a result, the fine yarn portion D2 existing at the position L2 of the spun yarn Y is erroneously determined as not exceeding the allowable lower limit yarn thickness.

  Thus, in the conventional first spinning unit 2, the winding device 9 winds the spun yarn Y around the package 91 while traversing the spun yarn Y, so the yarn path of the spun yarn Y in the yarn defect detecting device 7 changes. To do. For example, when the rotational speed of the friction roller 93 constituting the winding device 9 varies, the tension of the spun yarn Y in the yarn defect detecting device 7 may change. For this reason, it may be difficult to detect the defective portion generated in the spun yarn Y due to the instability of the detection signal of the yarn defect detecting device 7 due to these.

  Further, in the spinning machine 100, when there is a difference between the yarn feeding devices 10 constituting each spinning unit 2, the tension applied to the spun yarn Y stretched from the yarn feeding device 10 to the winding device 9 is the same. It may not be. As a result, the first spinning unit 2 varies, and it may be difficult to keep the quality of the spun yarn Y constant.

  FIG. 9 is a diagram showing an overall configuration of a conventional second spinning unit 3. In the second spinning unit 3, along the feeding direction of the sliver F and the spun yarn Y, the sliver supply unit 4, the draft device 5, the spinning device 6, the yarn feeding device 10, the yarn defect detecting device 7, and the tension The stabilizer 8 and the winding device 9 are arranged in this order. The sliver supply unit 4 mainly supplies the stored sliver F. The draft device 5 makes the thickness uniform by drafting the sliver F. The spinning device 6 produces the spun yarn Y by twisting the sliver F. The yarn feeding device 10 sends out the manufactured spun yarn Y. The yarn defect detecting device 7 detects the defect portion by measuring the thickness of the spun yarn Y. The tension stabilizing device 8 stabilizes the tension applied to the spun yarn Y. The winding device 9 winds the spun yarn Y around the package 91 while traversing.

  The second spinning unit 3 includes a yarn feeding device 10 as a part different from the spinning unit 1 according to the embodiment of the present invention, and the yarn defect detecting device 7 is disposed between the yarn feeding device 10 and the tension stabilizing device 8. Has been. As a result, the yarn defect detection device 7 detects the defect portion before the spun yarn Y fed from the yarn feeding device 10 reaches the tension stabilizing device 8.

  In such a conventional configuration, even if the winding device 9 winds the spun yarn Y around the package 91 while traversing the spun yarn Y, the yarn path of the spun yarn Y in the yarn defect detecting device 7 does not change. Further, for example, even if the rotational speed of the friction roller 93 constituting the winding device 9 varies, the tension of the spun yarn Y does not change. However, since the feed speed of the spun yarn Y by the yarn feed device 10 may fluctuate, it is necessary to increase the tension applied to the spun yarn Y, which affects the detection accuracy of the defective portion by the yarn defect detection device 7. There was a case.

  Specifically, the spun yarn Y sandwiched between the delivery roller 101 and the nip roller 102 is sent to the tension stabilizing device 8 according to the rotation of the delivery roller 101 and the nip roller 102. In some cases, a change in the tension applied to the spun yarn Y stretched from the yarn feeding device 10 to the tension stabilizing device 8 may occur due to a change in the feeding speed of the yarn feeding device 10. Therefore, there is one in which the tension stabilizing device 8 pulls the spun yarn Y to increase the tension and improve the detection accuracy of the yarn defect detecting device 7. However, an increase in the tension applied to the spun yarn Y may bury the features of the defective portion, resulting in difficulty in detecting the defective portion.

  Here, the problem that the feature of the defect portion is buried due to the increase in the tension applied to the spun yarn Y and it becomes difficult to detect the defect portion will be described in detail with reference to FIG.

  FIG. 10A is a diagram illustrating a detection signal when the yarn defect detection device 7 from which disturbance is excluded is used. FIG. 10B is a diagram showing detection signals of the yarn defect detection device 7 constituting the spinning unit 3. The elimination of disturbance means a state in which all disturbances affecting the detection accuracy of the yarn defect detection device 7 are eliminated as described above.

  FIG. 10A and FIG. 10B show changes in the yarn thickness obtained by connecting the yarn thicknesses of the spun yarn Y measured at predetermined intervals in the length direction of the spun yarn Y passing through the yarn defect detecting device 7. FIG. Similar to FIGS. 8A and 8B described above, it is indicated that the thick yarn portion D1 exists in the portion where the yarn thickness of the spun yarn Y exceeds the allowable upper limit yarn thickness, and the allowable lower limit yarn thickness is indicated. In the part beyond this, it is shown that the thin yarn part D2 exists.

  FIG. 10A shows the change in the yarn thickness measured in a state where all disturbances are excluded, so it can be assumed that the yarn thickness of the spun yarn Y without error is captured. 10A, there is a thick yarn portion D1 that is a portion exceeding the allowable upper limit yarn thickness at the position L1 of the spun yarn Y, and a thin yarn that is a portion exceeding the allowable lower limit yarn thickness at the position L2 of the spun yarn Y. It can be seen that the part D2 exists.

  On the other hand, FIG. 10B shows a change in the thickness of the yarn measured by the yarn defect detection device 7 constituting the spinning unit 3, so that the characteristic of the defect portion is buried by an increase in the tension applied to the spun yarn Y. The equalization of the detection signal can be seen. This is because the yarn thickness of the spun yarn Y including the defective portion is made uniform by increasing the tension applied to the spun yarn Y. Actually, the yarn thickness is uniformized as shown in FIG. 10B. It is not realized.

  Therefore, from FIG. 10B, at the position L1 of the spun yarn Y, it is not determined that the thick yarn portion D1 exists because the allowable upper limit yarn thickness is not exceeded, and the detection signal of the true defect portion is missed. . In addition, in the position L2 of the spun yarn Y, since it exceeds the allowable lower limit yarn thickness, it is determined that the thin yarn portion D2 exists.

  This is because the thick yarn portion D1 existing at the position L1 of the spun yarn Y is stretched due to the spun yarn Y being strongly pulled. As a result, the thick yarn portion D1 existing at the position L1 of the spun yarn Y is erroneously determined as not exceeding the allowable upper limit yarn thickness.

  As described above, in the conventional second spinning unit 3, since the tension applied to the spun yarn Y is changed due to the change in the feed speed of the spun yarn Y by the yarn feeding device 10, the tension is increased by pulling the spun yarn Y. It is necessary to keep. However, there are cases where it is difficult to detect a defect portion generated in the spun yarn Y due to equalization of detection signals from the yarn defect detection device 7.

  Further, when there is a mutual difference between the respective yarn feeding devices 10 constituting each spinning unit 3 in the spinning machine 100, the tension applied to the spun yarn Y spanned from the yarn feeding device 10 to the tension stabilizing device 8 is the same. Not. As a result, since the second spinning unit 3 varies, it may be difficult to make the quality of the spun yarn Y constant as the entire spinning machine 100.

  The above is the problem regarding the detection of the defective portion in the conventional first spinning unit 2 and the conventional second spinning unit 3. Hereinafter, the superiority of the detection accuracy of the defect portion in the spinning unit 1 according to the embodiment of the present invention will be described in detail with reference to FIG.

  FIG. 11 is a diagram showing a detection signal of the yarn defect detecting device 7 constituting the spinning unit 1 according to the embodiment of the present invention. Moreover, the broken line shown in the figure has shown the detection signal of the yarn fault detection apparatus 7 which comprises the conventional 1st spinning unit 2 and the conventional 2nd spinning unit 3. As shown in FIG.

  FIG. 11 is a diagram illustrating a change in the yarn thickness obtained by connecting the yarn thicknesses of the spun yarn Y measured at predetermined intervals in the length direction of the spun yarn Y that passes through the yarn defect detection device 7. . FIG. 11 shows that the thick yarn portion D1 exists at the portion where the yarn thickness of the spun yarn Y exceeds the allowable upper limit yarn thickness, and the thin yarn portion D2 exists at the portion where the allowable lower limit yarn thickness is exceeded. It is shown that.

  From FIG. 11, it can be seen that the yarn defect detection device 7 clearly captures the characteristics of the defect portion generated in the spun yarn Y. This is because, as in the conventional first spinning unit 2, the yarn path changes due to traversing of the spun yarn Y by the winding device 9, for example, due to fluctuations in the rotational speed of the friction roller 93 constituting the winding device 9. This is because the tension of the spun yarn Y does not change. Further, it is not necessary to increase the tension applied to the spun yarn Y as in the conventional second spinning unit 3.

  Accordingly, it is determined from FIG. 11 that the thick yarn portion D1 exists at the position L1 of the spun yarn Y because it exceeds the allowable upper limit yarn thickness, and the allowable lower limit yarn thickness at the position L2 of the spun yarn Y Therefore, it is determined that the thin yarn portion D2 exists.

  Thus, in the spinning unit 1 according to the embodiment of the present invention, the traversing of the spun yarn Y by the winding device 9 does not affect the detection accuracy of the defective portion by the yarn defect detecting device 7. Furthermore, the tension applied to the spun yarn Y can be kept moderate and stabilized, so that the accuracy of detecting the defective portion by the yarn defect detecting device 7 can be improved. As a result, the spinning unit 1 according to the embodiment of the present invention can improve the quality of the spun yarn Y to be manufactured.

  Further, since the spinning unit 1 according to the embodiment of the present invention does not use the yarn feeding device 10 that feeds the spun yarn Y, the tension of the spun yarn Y in each yarn defect detecting device 7 of each spinning unit 1 in the spinning machine 100. That is, the tension applied to the spun yarn Y hung from the spinning device 6 to the tension stabilizing device 8 does not vary. Therefore, the quality of the spun yarn Y can be made constant.

DESCRIPTION OF SYMBOLS 1 Spinning unit 2 Conventional 1st spinning unit 3 Conventional 2nd spinning unit 4 Sliver supply unit 5 Draft device 6 Spinning device 7 Yarn defect detecting device 8 Tension stabilizing device 9 Winding device 10 Yarn feeding device 11 Yarn splicing cart 12 Yarn Joint device D1 Thick thread D2 Thin thread F Fiber bundle (sliver)
Y spun yarn

Claims (9)

A draft device for drafting the fiber bundle;
A spinning device for producing spun yarn from a fiber bundle drafted by the draft device;
A tension stabilizer for stabilizing the tension of the spun yarn produced by the spinning device;
A winding device for winding the spun yarn fed from the tension stabilizer into a package;
A spinning unit comprising a yarn defect detection device capable of detecting a defect part of a spun yarn,
The yarn defect detecting device is disposed between the spinning device and the tension stabilizing device,
A spinning unit characterized in that a yarn feeding device for feeding spun yarn produced by the spinning device is not disposed between the spinning device and the tension stabilizing device . The tension stabilizer includes a roller member for winding spun yarn,
A unwinding member for unwinding the spun yarn wound around the roller member,
The said unwinding member stabilizes the tension | tensile_strength applied to the spun yarn spanned from the said spinning device to the said tension stabilizer by adjusting the unwinding speed of a spun yarn suitably. Spinning unit. The unwinding member increases the unwinding speed of the spun yarn when the tension applied to the spun yarn fed from the tension stabilizer is higher than a predetermined value;
3. The spinning unit according to claim 2, wherein the unwinding speed of the spun yarn is reduced when a tension applied to the spun yarn fed from the tension stabilizer is equal to or less than a predetermined value. The tension stabilizer includes a power unit that rotates the roller member,
The power unit stabilizes the tension applied to the spun yarn spanned from the spinning device to the tension stabilizing device by maintaining the winding speed of the spun yarn at a predetermined value. The spinning unit according to claim 3.   The tension stabilizing device temporarily stores the spun yarn by appropriately adjusting the unwinding speed with respect to the winding speed of the spun yarn. Spinning unit according to item.   The spinning unit according to any one of claims 1 to 5, wherein the yarn defect detecting device detects a defective portion of a spun yarn immediately after being produced by the spinning device.   The spinning according to any one of claims 1 to 6, wherein the yarn defect detecting device is configured to detect a defective portion of a spun yarn with a spinning tension by the spinning device. unit.   The spinning unit according to any one of claims 1 to 7, wherein the yarn defect detecting device is disposed at a position where a tension applied to the spun yarn is generated only by the tension stabilizing device.   The spinning according to any one of claims 1 to 8, wherein the spinning device produces a spun yarn by twisting a fiber bundle drafted by the draft device with a swirling airflow. unit.

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