JP2011202313A - Air spinning device and spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air spinning device which can stabilize the behaviors of winding fibers to improve the strength of the spun yarn.SOLUTION: The air spinning device includes a nozzle block 34 and a hollow guide shaft body 20. The nozzle block 34 is provided with a depressurized suction chamber and a whirling chamber having a larger peripheral length than that of the depressurized suction chamber. The nozzle block 34 is provided with at least one air injecting nozzle 27 which injects compressed air from a nozzle opening 27a opened into the whirling chamber, thereby generating whirling airflow in the whirling chamber. A fiber passage is formed in the hollow guide shaft body 20. Moreover, the hollow guide shaft body 20 is arranged such that a tip end on the inlet hole side of the fiber passage is located within the depressurized suction chamber. The nozzle opening 27a is located on the feeding direction downstream side of a fiber bundle rather than the tip end of the hollow guide shaft body 20.

Description

  The present invention mainly relates to a pneumatic spinning device. In detail, it is related with arrangement | positioning of the spindle with which an air spinning apparatus is provided, and an air injection nozzle.

  2. Description of the Related Art Conventionally, a spinning machine including an air spinning device that twists fibers using a swirling air flow to generate spun yarn is known.

  This type of pneumatic spinning device includes a spindle and an air injection nozzle that generates a swirling airflow around the spindle by injecting an air flow. And the fiber which received the effect | action of the said swirl | vortex airflow swirls around a spindle, a twist is added to a fiber and a spun yarn is produced | generated.

  As described above, in the pneumatic spinning device, the fibers are twisted by the swirling airflow to form the spun yarn. Therefore, the quality of the spun yarn greatly depends on the flow of the swirling airflow. Therefore, conventionally, contrivances have been made to the formation position of the air injection nozzle for generating the swirling airflow, the shape of the spindle through which the swirling airflow flows, and the like.

  For example, in the spinning device disclosed in Patent Document 1, the air injection nozzle (air injection hole) is a round portion in which the air injected from the air injection nozzle is formed at the upper end corner of the spindle (hollow guide shaft). It is provided so that it may be ejected below in the tangential direction. According to Patent Document 1, the air jetted from the air jet nozzle is a swirling airflow that flows downward spirally around the hollow guide shaft body.

  Patent Document 2 discloses a configuration in which the inclination angle of the air injection nozzle (nozzle) is set to an angle of 70 degrees or more and 90 degrees or less with respect to the traveling direction of the fiber bundle. In Patent Document 2, it is described that a yarn having a satisfactory twist number can be obtained. Referring to FIG. 2 of Patent Document 2, the air outlet of the air injection nozzle is set on the upstream side of the spindle tip.

  Patent Document 3 has a configuration in which the outlet of the air injection nozzle (air nozzle) does not face the reversing chamber (suction decompression chamber) (that is, the outlet is formed on the downstream side of the tip of the spindle). Disclosure. According to Patent Document 3, it is possible to suppress rapid diffusion of air injected from the air injection nozzle. Further, in the spinning machine disclosed in Patent Document 3, the spindle is made cylindrical (constant diameter) within a predetermined length from the tip side thereof, so that the whirling air generation chamber is cut within the predetermined length. The area is configured to be constant. According to Patent Document 3, a stable swirling airflow is given to the whole, and a swirling airflow can be effectively generated.

JP 2003-193337 A Japanese Patent Laid-Open No. 3-241021 JP 2008-297687 A

  In the configuration in which air is jetted in the tangential direction of the rounded portion formed at the upper end corner of the spindle as in Patent Document 1, there is a possibility that the jet air from the air jet nozzle collides with the tip of the spindle. is there. If the air collides with the hollow guide shaft body in this way, the compressed air ejected at a high speed will rapidly expand, and the flow rate of the compressed air may be reduced and a swirling airflow may not be generated. is there. As a result, the reversal fiber cannot be wound around the core fiber, and the spun yarn may not be generated.

  Further, from the viewpoint of stabilizing the behavior of the reversal fiber and applying appropriate tension to the reversal fiber, it is preferable that the reversal fiber is appropriately pressed against the spindle tip. However, when the nozzle outlet is set upstream of the tip of the spindle as in Patent Document 2, depending on the inclination angle of the nozzle, the nozzle is inverted to the tip of the spindle by the force of the compressed air ejected from the nozzle. The fiber may not be pressed. That is, in the configuration of Patent Document 2, when the nozzle tilt angle is large (especially 70 ° to 90 °), the compressed air is ejected toward the upstream side of the tip of the spindle. Therefore, the reversal fiber cannot be pressed with sufficient force on the tip of the spindle. For this reason, in the structure of patent document 2, there exists a case where the inversion fiber will have floated from the spindle front-end | tip. If the reversal fiber is lifted from the tip of the spindle in this way, sufficient tension cannot be applied to the wound fiber during twisting. In addition, problems such as entanglement of the ends of the inverted reversal fibers also occur. As a result, the yarn strength of the spun yarn produced may be reduced.

  On the other hand, in Patent Document 3, since the outlet of the air nozzle is formed downstream of the tip of the spindle, the reversal fiber is excessively pressed against the spindle by the force of compressed air injected from the air nozzle. And the rotation of the reversal fiber is obstructed. Moreover, since the space between the nozzle block and the spindle is constant in the configuration of Patent Document 3, the swirling airflow generated by the compressed air ejected from the air nozzle tends to flow toward the downstream side. For this reason, as the swirling airflow flows downstream, the flow toward the downstream side of the swirling airflow (axial flow component) increases, and conversely, the flow (the swirling component) that swirls the reversal fibers rapidly decreases. End up. As a result, the rotation speed of the reversal fiber may decrease.

  The present invention has been made in view of the above circumstances, and its main object is to provide an air spinning device capable of stabilizing the behavior of the wound fiber and improving the yarn strength of the spun yarn. It is in.

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 a first aspect of the present invention, there is provided an air spinning device for producing a spun yarn by swirling the fibers of a fiber bundle by a swirling airflow, which is configured as follows. That is, the pneumatic spinning device includes a suction pressure reducing chamber portion, a swirl chamber portion, and a spindle. A suction decompression chamber is formed in the suction decompression chamber. A swirl chamber having a longer circumference than the suction decompression chamber is formed in the swirl chamber portion. Further, the swirl chamber portion is formed with one or more air injection nozzles for injecting compressed air from a nozzle opening opened in the swirl chamber to generate the swirl airflow in the swirl chamber. A fiber passage is formed inside the spindle. In addition, the spindle is arranged such that a tip end portion on the inlet side of the fiber passage is located in the suction decompression chamber. The nozzle port is set on the downstream side in the feeding direction of the fiber bundle from the tip of the spindle.

  In this way, by forming the nozzle port on the swirl chamber side and arranging the tip of the spindle so as to be located in the suction decompression chamber, the compressed air ejected from the nozzle port expands near the tip of the spindle. Therefore, the reversal fiber can be prevented from floating at the tip of the spindle. That is, the inverted fiber can be stably pressed against the spindle tip by the compressed air. Moreover, by making the circumference of the suction decompression chamber shorter than the circumference of the swirl chamber, the expanded compressed air is less likely to flow from the swirl chamber toward the suction decompression chamber. As a result, the swirl component of the swirling airflow in the suction decompression chamber is reduced, and the air flow gently flowing toward the downstream side dominates the suction decompression chamber, so that the reversal of the fibers in the swirl chamber becomes smooth and the core fibers are wound. An appropriate tension of the attached fibers can be stably obtained. As a result, the yarn strength of the produced spun yarn is improved. In addition, since the reversal fiber is difficult to lift from the spindle surface, stable spinning is possible even when the fiber turning speed is increased, and a conventional spinning device (spinning speed is about 250 m / min to 400 m / min). Thus, it is possible to cope with high speed spinning at 500 m / min or 600 m / min which could not be realized.

  The pneumatic spinning device is preferably configured as follows. That is, in a cross section when cut along a plane passing through the axis of the spindle, at least a portion on the suction decompression chamber side of the inner wall surface of the swirl chamber portion forming the swirl chamber has a substantially curved cross section. It is formed in a shape.

  As a result, the swirl chamber can be configured so that there is no angular portion on the suction decompression chamber side wall, so that the air flow is prevented from being disturbed in the swirl chamber, and the air flow can flow smoothly. . As a result, the wound fiber can be prevented from being irregularly wound around the core fiber or the free ends of the wound fiber can be entangled with each other, so that the quality of the generated yarn can be stabilized.

  In the pneumatic spinning device, at least a part of the opening contour of the nozzle port is such that the cross-sectional contour is formed in the curved portion of the inner wall surface of the swirl chamber that forms the swirl chamber. Is preferred.

  Thus, by forming at least a part of the nozzle opening on the wall surface having a curved cross-sectional outline, the elliptical perimeter of the opening outline of the nozzle opening can be increased. Thereby, since compressed air can be injected toward the swirl chamber so as to spread from the nozzle opening, and swirl airflow can be applied to the fiber in a wide range, the fiber can be swirled efficiently with a strong force. In addition, when the wall surface of the swirl chamber is angular as in the conventional pneumatic spinning device, if the nozzle port is formed so as to straddle the angular part, the nozzle is formed with a slight deviation in the formation position. The shape of the mouth changes greatly, and the air flow in the swirl chamber also changes. Therefore, when the nozzle opening is formed on an angular wall surface, the quality of the generated yarn is easily affected by the processing accuracy. In this regard, as described above, when the nozzle port is formed on the wall surface having a curved cross-sectional contour, the outlet shape of the injection nozzle does not change much even if the position where the nozzle port is formed is slightly shifted. That is, by configuring the pneumatic spinning device as described above, the quality of the generated yarn can be maintained regardless of the processing accuracy.

  The pneumatic spinning device is preferably configured as follows. That is, when viewed in a direction perpendicular to the central axis of the spindle and perpendicular to the longitudinal direction of the air injection nozzle, the longitudinal direction of the air injection nozzle is not less than 70 degrees and 80 degrees with respect to the central axis of the spindle. It is inclined at an angle of less than or equal to degrees.

  As a result, the balance between the speed in the swirling direction and the speed in the fiber feeding direction of the swirling airflow acting on the fibers in the swirling chamber becomes particularly good during high-speed spinning. That is, the compressed air jetted from the air jet nozzle formed as described above can cause the fibers to turn at a sufficient speed while generating a suction flow that pulls the fibers toward the downstream side in the fiber feeding direction. As a result, the strength of the spun yarn to be generated can be improved. Further, since the swirl component of the air acting on the fibers is maintained in the swirl chamber, the floating short fibers are sequentially caught and wound around the reversal fibers, and the fiber loss can be reduced.

  In the pneumatic spinning device, the flow passage cross-sectional area at the downstream end of the swirl chamber is formed to be smaller than the flow passage cross-sectional area at the position where the nozzle port of the swirl chamber is formed. Is preferred.

  Thereby, the swirl airflow can be kept at a high speed until the swirl airflow is discharged from the swirl chamber. That is, since the fiber can be swirled at a high speed in the swirl chamber, the yarn strength of the spun yarn to be generated can be improved even in the case of high-speed spinning.

  According to a second aspect of the present invention, there is provided a spinning machine comprising the above-described pneumatic spinning device and a winding device that winds the spun yarn produced by the pneumatic spinning device into a package.

  Thereby, even in the case of high-speed spinning, a spun yarn with improved yarn strength can be generated, so that a high-quality package can be efficiently formed at a higher speed than a conventional spinning machine.

1 is a front view showing an overall configuration of a spinning machine according to an embodiment of the present invention. The longitudinal cross-sectional view of a spinning machine. The typical longitudinal section of an air spinning device. The longitudinal cross-sectional view of a nozzle block. The longitudinal cross-sectional view which shows the mode during spinning. The typical longitudinal section of the pneumatic spinning device concerning another embodiment.

  Next, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a front view showing the overall configuration of the spinning machine 1 according to the present embodiment, and FIG. 2 is a longitudinal sectional view of the spinning machine 1.

  A spinning machine 1 as a spinning machine shown in FIG. 1 includes a large number of spinning units 2 arranged side by side. The spinning machine 1 includes a yarn splicing carriage 3, a blower box 4, and a prime mover box 5. The yarn splicing cart 3 is configured to be able to travel in the direction in which the spinning units 2 are arranged.

  As shown in FIG. 1, each spinning unit 2 includes a draft device 7, an air spinning device 9, a yarn feeding device 11, and a winding device 12 as main components. The draft device 7 is provided on the upper part of the frame 6 of the spinning machine 1, and the pneumatic spinning device 9 is configured to produce the spun yarn 10 by spinning the fiber bundle 8 sent from the draft device 7. ing. The spun yarn 10 delivered from the pneumatic spinning device 9 is fed by the yarn feeding device 11 and then wound by the winding device 12 to form a package 45. In FIG. 1, the winding device 12 is illustrated to form a cheese winding package, but may be configured to form a cone winding package. In the following description, the terms “upstream” and “downstream” simply refer to the upstream side or the downstream side in the feeding direction of the fiber bundle 8 (or the spun yarn 10).

  The draft device 7 is for drawing the sliver 13 into the fiber bundle 8. As shown in FIG. 2, the draft device 7 includes four rollers: a back roller 14, a third roller 15, a middle roller 17 on which an apron belt 16 is mounted, and a front roller 18.

  A draft motor 31 made of an electric motor is installed at an appropriate position of the frame 6, and the back roller 14 and the third roller 15 are connected to the draft motor 31 via a belt. The driving and stopping of the draft motor 31 are controlled by a unit controller provided in the spinning unit 2. In the spinning machine 1 of the present embodiment, an electric motor for driving the middle roller 17 and the front roller 18 is also provided in the frame 6, but illustration thereof is omitted here.

  As shown in FIG. 2, the pneumatic spinning device 9 includes blocks divided into two, that is, a first block 91 and a second block 92. The second block 92 is provided on the downstream side of the first block 91.

  The yarn feeding device 11 includes a delivery roller 39 supported by the frame 6 of the spinning machine 1 and a nip roller 40 disposed so as to come into contact with the delivery roller 39. With this configuration, the spun yarn 10 delivered from the pneumatic spinning device 9 is sandwiched between the delivery roller 39 and the nip roller 40, and the delivery roller 39 is rotated by an electric motor (not shown), so that the spun yarn 10 is wound on the winding device 12 side. Can be sent to.

  As shown in FIGS. 1 and 2, the yarn joining cart 3 includes a splicer (yarn joining device) 43, a suction pipe 44, and a suction mouth 46. As shown in FIG. 1, the yarn splicing carriage 3 is provided so as to run on a rail 41 provided on the frame 6 of the spinning machine 1 main body. When yarn breakage or yarn cut occurs in a spinning unit 2, the yarn splicing carriage 3 travels to the spinning unit 2 and stops. The suction pipe 44 sucks and captures the yarn end fed from the pneumatic spinning device 9 and guides it to the splicer 43 while rotating in the vertical direction around the axis. The suction mouse 46 sucks and captures the yarn end from the package 45 rotatably supported by the winding device 12 while rotating in the vertical direction around the shaft, and guides it to the splicer 43. The splicer 43 is configured to perform splicing between guided yarn ends.

  Next, the configuration of the pneumatic spinning device 9 will be described in detail with reference to FIG. FIG. 3 is a schematic longitudinal sectional view of the pneumatic spinning device 9 when cut along a plane passing through the axis of the hollow guide shaft body 20.

  As shown in FIG. 3, the first block 91 includes a nozzle part casing 53, and the nozzle block 34 and the fiber guide part 23 held by the nozzle part casing 53. The second block 92 includes a hollow guide shaft body (spindle) 20 and a shaft body holding member 59.

  A fiber introduction hole 21 is formed in the fiber guide portion 23, and the fiber bundle 8 drafted by the upstream draft device 7 is introduced into the fiber introduction hole 21. The fiber guide 23 holds a needle 22 disposed on the flow path of the fiber bundle 8 introduced from the fiber introduction hole 21.

  A nozzle block (suction decompression chamber portion, swirl chamber portion) 34 is disposed at a position downstream of the fiber guide portion 23. A detailed sectional view of the nozzle block 34 is shown in FIG. 4 is a longitudinal sectional view of the nozzle block 34 cut along the same plane as FIG. 3 (a plane passing through the axis of the hollow guide shaft 20). As shown in FIG. 4, a through hole 70 is formed in the nozzle block 34. The through hole 70 is formed so that the cross-sectional shape when it is cut along a plane orthogonal to the central axis 90 of the hollow guide shaft body 20 (a plane orthogonal to the fiber feed direction) is circular.

  As shown in FIG. 3, the hollow guide shaft body 20 includes a cylindrical body 56 held by a shaft body holding member 59. A tapered portion 24 having a tapered shape is formed at one end of the cylindrical body 56. An inlet hole 28 is formed at the tip of the tapered portion 24. A fiber passage 29 that communicates with the inlet hole 28 is formed at the axial center of the cylindrical body 56. The downstream end of the fiber passage 29 is an outlet hole (not shown). The fiber bundle 8 or the spun yarn 10 that has passed through the fiber passage 29 is sent out from the outlet hole toward the outside of the air spinning device 9 by the yarn feeding device 11 disposed on the downstream side of the pneumatic spinning device 9.

  The tapered portion 24 of the hollow guide shaft body 20 is inserted into the through hole 70 formed in the nozzle block 34 from the opposite side of the fiber guide portion 23 when viewed from the nozzle block 34 with the axis line aligned. In addition, a predetermined interval is provided between the outer peripheral surface of the tapered portion 24 of the hollow guide shaft body 20 and the inner wall surface of the nozzle block 34 (the wall surface of the through hole 70) so that an air flow can pass therethrough. Yes.

  In the nozzle block 34, a suction decompression chamber 71, a swirl chamber 72, and a taper chamber 73 are formed in this order from the upstream side in the traveling direction of the fiber bundle 8. More precisely, a substantially columnar suction decompression chamber 71 and a substantially cylindrical shape are constituted by the outer peripheral surface of the tapered portion 24 of the hollow guide shaft body 20 and the inner wall surface (wall surface of the through hole 70) of the nozzle block 34. The swirl chamber 72 and the tapered chamber 73 having a substantially tapered cylindrical shape are formed. Although the suction decompression chamber 71 has a substantially columnar shape, actually, as shown in FIG. 3, the distal end portion of the hollow guide shaft body 20 (the distal end portion of the inlet hole 28 of the fiber passage 29) is the suction decompression chamber. It is inserted slightly into the suction decompression chamber 71 from the downstream side of 71.

  As shown in FIG. 3, the suction decompression chamber 71 and the fiber introduction hole 21 of the fiber guide portion 23 communicate with each other. Further, the swirl chamber 72 and the suction decompression chamber 71 communicate with each other. Further, the tapered chamber 73 and the swirl chamber 72 communicate with each other.

  On the other hand, a supply air storage chamber 61 is formed around the nozzle block 34. The nozzle casing 53 is connected to a compressed air supply pipe 65 connected to a not-shown compressed air source. Thereby, compressed air can be supplied from the compressed air source to the supply air storage chamber 61.

  The nozzle block 34 is formed with one or more air injection nozzles 27 that connect the swirl chamber 72 and the supply air storage chamber 61. In addition, in this embodiment, although the four air injection nozzles 27 are formed, the number in which the air injection nozzle 27 is formed is not limited to this. These air injection nozzles 27 are configured as elongated round holes formed in the nozzle block 34. The compressed air supplied to the supply air storage chamber 61 is injected into the swirl chamber 72 via the air injection nozzle 27. As a result, a swirling airflow that flows in one direction around the axis of the hollow guide shaft 20 is generated in the swirl chamber 72.

  In order to generate the swirl air flow in the swirl chamber 72 as described above, the air injection nozzle 27 is formed so that the longitudinal direction thereof is substantially in the tangential direction of the swirl chamber 72 in plan view. In FIG. 3, the longitudinal direction of the air injection nozzle 27 is drawn as if it is in the same plane as the central axis of the swirl chamber 72, but this is simplified (conceptual) for easy understanding of the drawing. The air injection nozzle 27 is actually formed in the tangential direction of the swirl chamber 72 as described above. Therefore, a cross-sectional view showing the air injection nozzle 27 more accurately is as shown in FIG.

  Further, as shown in FIGS. 3 and 4, the air injection nozzle 27 is formed such that its longitudinal direction is slightly inclined toward the downstream side. Thereby, the compressed air injected from the air injection nozzle 27 can flow toward the downstream side.

  With the above configuration, the compressed air ejected from the air ejection nozzle 27 flows toward the downstream side in the traveling direction of the fiber bundle 8 while swirling in the swirl chamber 72. That is, a spiral swirling airflow that flows toward the downstream side can be generated in the swirling chamber 72.

  An air discharge space 55 is formed in the nozzle casing 53. The air discharge space 55 communicates with the taper chamber 73. An unillustrated negative pressure source (suction means) disposed in the blower box 4 is connected to the air discharge space 55 through a pipe 60.

  Next, the state when the fiber bundle 8 is introduced into the fiber introduction hole 21 in the pneumatic spinning device 9 configured as described above will be described.

  First, compressed air is supplied to the supply air storage chamber 61 from a compressed air source (not shown) in a state where the fiber bundle 8 is not introduced into the air spinning device 9 (state shown in FIG. 3). The compressed air supplied to the supply air storage chamber 61 is injected into the swirl chamber 72 through the air injection nozzle 27. As a result, the swirling airflow generated in the swirl chamber 72 flows spirally downstream in the swirl chamber 72, then flows into the taper chamber 73, flows further downstream while decreasing its flow velocity, and finally It is discharged from the air discharge space 55.

  On the other hand, when the air flow toward the downstream side is generated in the swirl chamber 72 as described above, the suction decompression chamber 71 adjacent to the upstream side of the swirl chamber 72 is depressurized, and the fiber introduction hole 21 is filled. A suction air flow is generated. This suction air flow flows into the suction decompression chamber 71 from the fiber introduction hole 21, then partially flows into the fiber passage 29 and flows downstream, and the rest flows into the swirl chamber 72 and joins the swirling airflow. To do.

  When the fiber bundle 8 is sent from the draft device 7 to the air spinning device 9 in this state, the fiber bundle 8 is sucked from the fiber introduction hole 21 and guided into the suction decompression chamber 71. The fiber bundle 8 guided into the suction decompression chamber 71 rides on the flow of the suction air flow flowing into the fiber passageway 29 and is guided downstream through the fiber passageway 29. It is sent to the outside of the device 9.

  The ends of the fiber bundle 8 or the spun yarn 10 exiting from the outlet hole of the air spinning device 9 are captured by a suction pipe 44 provided in the yarn splicing carriage 3, and are spliced to the yarn end on the package 45 side in the splicer 43. . As a result, the fiber bundle 8 or the spun yarn 10 is in a continuous state from the front roller 18 to the yarn feeding device 11 through the fiber introduction hole 21, the suction decompression chamber 71 and the fiber passage 29. In this state, a feed force to the downstream side is applied by the yarn feeding device 11, whereby tension is applied to the yarn and the spun yarn 10 is successively drawn out from the pneumatic spinning device 9.

  Next, how the spun yarn 10 is generated by twisting the fiber bundle 8 in the pneumatic spinning device 9 of the present embodiment will be described with reference to FIG. In FIG. 5, the flow of air in the pneumatic spinning device 9 is conceptually indicated by thick arrows.

  The fiber bundle 8 is composed of a large number of fibers. Each fiber is introduced into the suction decompression chamber 71 from the fiber introduction hole 21. The downstream end of each fiber is introduced into the fiber passage 29 by riding on a suction air flow that flows from the fiber introduction hole 21 toward the fiber passage 29. Thereby, at least a part of the fibers introduced into the suction decompression chamber 71 is in a continuous state between the fiber introduction hole 21 and the fiber passage 29. The fiber in this state is called a core fiber 8a.

  The core fiber 8a is twisted along with the reversal fiber 8b (described later) swirling in the swirl chamber 72. Although this twist tends to propagate upstream (front roller 18 side), the propagation is blocked by the needle 22, so that the fiber bundle 8 delivered from the front roller 18 may be twisted by the twist. Absent. Thus, the needle 22 forms a twist propagation preventing means.

  The downstream end of each fiber introduced into the suction decompression chamber 71 is twisted into the core fiber 8a being twisted. However, each fiber is not entirely twisted into the core fiber 8a, and the upstream end is a free end.

  When the free ends (upstream end portions) of the fibers enter the suction decompression chamber 71, the free ends are separated from the core fiber 8a and opened, and the suction decompression chamber 71 and the swirl chamber 72 are opened. To the swirl chamber 72 side (downstream side) by the suction air flow flowing into In this way, the upstream end of the fiber is caused to flow downstream, whereby the direction of the upstream end is “reversed”. The short fiber in this state is referred to as an inverted fiber 8b. In addition, the fiber which was the core fiber 8a can also become the inversion fiber 8b, when the upstream end part enters the suction decompression chamber 71.

  The free end of the reversal fiber 8b is introduced into the swirl chamber 72 and is affected by a swirling airflow that flows spirally toward the downstream side. Thereby, as shown in FIG. 5, the reversal fiber 8 b turns around the tapered portion 24 of the hollow guide shaft body 20 while being along the surface of the tapered portion 24 of the hollow guide shaft body 20. Therefore, the free end of the reversal fiber 8b is swung around the core fiber 8a passing through the fiber passage 29. Thereby, the reversal fiber 8b is wound around the core fiber 8a sequentially to become a wound fiber.

  At this time, the reversal fiber 8b is pressed against the surface of the tapered portion 24 of the hollow guide shaft body 20 by a force that tends to flow to the downstream side of the swirling airflow. It is possible to turn around the tapered portion of the shaft body 20.

  Further, since the core fiber 8a is sent to the downstream side in the fiber passage 29, the reversal fibers 8b (winding fibers) wound around the core fiber 8a are sequentially brought into the fiber passage 29. Dragged. At this time, since the reversal fiber 8b is pressed against the surface of the tapered portion 24 of the hollow guide shaft body 20 by the force of flowing toward the downstream side of the swirling airflow, the reversal fiber 8b is moderate when dragged into the fiber passage 29. Tension is applied. Thereby, the inversion fiber 8b can be strongly wound around the core fiber 8a, and the spun yarn 10 having high yarn strength can be generated.

  In this way, a real twisted spun yarn 10 is produced. The spun yarn 10 advances through the fiber passage 29 and is sent out from the outlet hole (not shown) toward the yarn feeding device 11.

  Then, the spun yarn 10 is wound around the winding device 12 via the yarn feeding device 11 shown in FIG. 1, whereby the package 45 is finally formed. The fibers that are not twisted into the spun yarn 10 due to, for example, breaking during the opening and twisting of the above-mentioned fibers ride on the flow of air flow from the swirl chamber 72 to the air discharge space 55 through the taper chamber 73. It is sent and discharged through the pipe 60 by suction of the negative pressure source.

  Next, the configuration of the nozzle block 34 in the pneumatic spinning device 9 of the present embodiment will be described in detail.

  First, the shape of the swirl chamber forming surface 82 that forms the swirl chamber 72 will be described.

  As shown in FIG. 4, of the inner wall surface of the nozzle block 34 (the wall surface of the through hole 70), the portion that forms the suction decompression chamber 71 is the suction decompression chamber forming surface 81, and the portion that forms the swirl chamber 72 is the swirl chamber. Let it be surface 82. The suction decompression chamber forming surface 81 faces the suction decompression chamber 71. The swirl chamber forming surface 82 faces the swirl chamber 72.

  FIG. 4 shows a cross-sectional view of the nozzle block 34 in the present embodiment when cut by a plane passing through the central axis of the hollow guide shaft body 20. In this cross-sectional view, the portion on the upstream side (suction decompression chamber 71 side) of the swirl chamber forming surface 82 is a curved portion 82a having a curved cross-sectional contour, and the downstream portion of the swirl chamber forming surface 82 is The cross-sectional outline is a straight portion 82b having a linear shape.

  In the pneumatic spinning device 9 of the present embodiment, the radius R1 of the suction decompression chamber forming surface 81 is formed to be smaller than the radius R2 of the swirl chamber forming surface 82 (more precisely, the radius of the straight portion 82b). Yes. In other words, the circumferential length of the swirl chamber 72 is longer than the circumferential length of the suction decompression chamber 71. Thus, even if the compressed air ejected into the swirl chamber 72 expands by making the radius of the suction decompression chamber 71 shorter than that of the swirl chamber 72, the compressed air is moved to the suction depressurization chamber 71 side. It can be made difficult to flow. Thereby, in the suction pressure reduction chamber 71, since an air flow can be smoothly flowed toward a downstream side, a fiber can be smoothly reversed in the suction pressure reduction chamber 71.

  As shown in FIG. 4, the downstream end of the suction decompression chamber forming surface 81 and the upstream end of the straight portion 82b of the swirl chamber forming surface 82 are connected by a curved portion 82a. And in sectional drawing (FIG. 4 figure) when cut | disconnecting in the plane which passes along the center axis line of the hollow guide shaft body 20, the cross-sectional outline of the curved part 82a and the linear part 82b is connected smoothly. In this manner, the swirl chamber 72 is configured so that there is no angular portion by making the cross-sectional contour upstream (the fiber guide portion 23 side) of the swirl chamber forming surface 82 a curved shape.

  On the other hand, for example, in Patent Document 1, the swirl chamber (the first frustoconical space portion and the second frustoconical space portion) includes an angular portion (the first frustoconical space portion and the second frustoconical space portion). Connection part). When there is an angular portion in the swirl chamber, the air flow is disturbed in the swirl chamber, and the behavior of the inversion fiber may become unstable.

  In this regard, in the present embodiment, since the swirl chamber 72 is configured not to have an angular portion as described above, the turbulence of the air flow in the swirl chamber 72 can be reduced. Therefore, since the behavior of the reversal fiber in the swirl chamber 72 can be stabilized, the reversal fiber 8b is prevented from floating from the surface of the taper portion 24 of the hollow guide shaft body 20, and a high quality yarn is stabilized. Can be generated.

  Moreover, in this embodiment, the cross-sectional outline of the curved part 82a is specifically circular arc shape. Thus, by making the cross-sectional outline of the swirl chamber 72 into an arc shape, the turbulence of the air flow in the swirl chamber 72 can be reduced particularly well. In addition, by reducing the turbulence of the air flow in the swirl chamber 72 in this manner, the compressed air ejected into the swirl chamber 72 can be made difficult to expand in the swirl chamber 72.

  In addition, when the spinning speed is high, such as 500 m / min or 600 m / min, it is particularly important to rotate the reversal fiber with respect to the core fiber reliably and in a short time (high speed). However, when high speed spinning is performed, the time until the reversal fiber 8b is dragged into the fiber passage 29 is shortened, so that a slight turbulence in the air flow in the swirl chamber 72 greatly affects the number of rotations of the reversal fiber 8b. . In this regard, as in the present embodiment, by forming the cross-sectional contour of the curved portion 82a of the swirl chamber 72 in an arc shape, the air flow in the swirl chamber 72 can be stabilized. However, it is possible to stably produce high quality spun yarn.

  Next, the air injection nozzle 27 in this embodiment will be described.

  As described above, the air injection nozzle 27 is formed so that its longitudinal direction is substantially in the tangential direction of the swirl chamber 72. Therefore, the opening outline of the portion (nozzle port 27a) where the air injection nozzle 27 is opened in the swirl chamber forming surface 82 is substantially elliptical as shown in FIG. In the present embodiment, the circumferential length of the opening contour of the nozzle port 27a is referred to as an elliptical circumferential length.

  In the pneumatic spinning device 9 of the present embodiment, the nozzle port 27a of the air injection nozzle 27 is formed in the curved portion 82a of the swirl chamber forming surface 82 as shown in FIG. Thereby, compared with the case where the nozzle port 27a is formed in the linear part 82b, for example, since the elliptical perimeter of the nozzle port can be increased, the compressed air can be ejected so as to spread toward the downstream side. . Thereby, since a swirl | vortex airflow can be made to act on a fiber in a wide range, a fiber can be swirled efficiently with a strong force. Further, since the compressed air can be ejected so as to spread toward the downstream side in this way, even if the compressed air is expanded in the swirl chamber 72, the compressed air is upstream (suction decompression chamber). 71 side) is difficult to flow. As a result, the swirling airflow can flow more smoothly toward the downstream side, and the turbulence of the airflow in the swirling chamber 72 can be further reduced.

  Further, for example, in Patent Document 1, since the nozzle port of the air injection hole is formed so as to straddle an angular portion (a connecting portion between the columnar space portion and the first frustoconical space portion), There is a problem in that the opening shape of the nozzle opening changes greatly only by slightly shifting the formation position. Therefore, the configuration of Patent Document 1 has a drawback that the yarn quality is easily affected by processing accuracy. In this regard, in the present embodiment, the entire nozzle opening 27a is formed in the curved portion 82a of the swirl chamber forming surface 82. That is, in the present embodiment, the nozzle port 27a is formed at a position that does not straddle the part where the wall surface is angular. According to the configuration of this embodiment, even if the position where the nozzle port 27a is formed is slightly shifted, the shape of the opening contour of the nozzle port 27a does not change so much, so that it is independent of the processing accuracy of the air injection nozzle 27. Thus, the quality of the spun yarn 10 can be maintained.

  Further, as shown in FIGS. 3 and 4, the distal end of the hollow guide shaft body 20 is slightly inserted into the suction decompression chamber 71. In other words, the distal end of the hollow guide shaft body 20 is located upstream of the downstream end of the suction decompression chamber forming surface 81. The nozzle port 27 a of the air injection nozzle 27 is formed in the swirl chamber forming surface 82. That is, the nozzle port 27 a is formed on the downstream side of the tip of the hollow guide shaft body 20. Thereby, it is possible to prevent the compressed air ejected from the nozzle port 27 a from colliding with the tip of the hollow guide shaft body 20. Therefore, it is possible to prevent the blown air from expanding at the tip of the hollow guide shaft body 20, so that a swirling airflow can be generated satisfactorily in the swirling chamber 72.

  Next, the inclination angle of the air injection nozzle 27 will be described. As described above, FIG. 4 is a cross-sectional view taken along a plane passing through the axis of the hollow guide shaft body 20. Further, this plane is parallel to the longitudinal direction of the right air injection nozzle 271 in the drawing. Therefore, FIG. 4 can be said to be a view when viewed in a direction perpendicular to the central axis of the hollow guide shaft body 20 and perpendicular to the longitudinal direction of the air injection nozzle 271. In FIG. 4, an angle formed by the central axis 90 of the hollow guide shaft body 20 and the longitudinal direction of the air injection nozzle 271 is defined as an inclination angle α.

  When this inclination angle α is small (when the angle of the air injection nozzle 27 is steep), the jet air flows vigorously downstream, so that a strong suction air flow can be generated in the fiber introduction hole 21. However, since the flow swirling in the swirl chamber 72 becomes weak, the reversal fiber 8b cannot be sufficiently wound around the core fiber 8a, and the yarn strength may be reduced. Moreover, since the short fiber which is not twisted into a core fiber increases, the problem that a fiber loss increases may also generate | occur | produce. On the other hand, when the inclination angle α is large (when the air injection nozzle 27 is trapped), a swirling airflow that swirls vigorously in the swirl chamber 72 can be generated by the blown air, but the flow toward the downstream side becomes weak. Therefore, there is a case where a sufficient suction air flow cannot be generated in the fiber introduction hole 21 and the fiber bundle 8 cannot be sucked.

  In this regard, the inventor of the present application, in the pneumatic spinning device 9 of the present embodiment, if the inclination angle α is in the range of 70 ° to 80 °, the flow of the swirling airflow and the flow toward the downstream side are: It was confirmed that the balance was good in high speed spinning. That is, by setting the inclination angle α within the above range, the suction of the fiber bundle 8 in the fiber introduction hole 21 and the swirl of the reversal fiber 8b in the swirl chamber 72 are appropriately performed, and the high-quality spun yarn 10 is obtained. Can be generated. Therefore, in the pneumatic spinning device 9 of the present embodiment, the inclination angle α is in the range of 70 ° to 80 °. In the drawing, the inclination angle α is shown only for one air injection nozzle 271, but a plurality of air injection nozzles 27 arranged in the nozzle block 34 are all formed at the same inclination angle.

  Next, the flow path area of the swirl chamber 72 will be described. The channel area refers to the cross-sectional area of the swirl chamber 72 when cut along a plane orthogonal to the fiber feeding direction.

  In the present embodiment, the outer peripheral wall surface of the tapered portion 24 of the hollow guide shaft body 20 constituting the inner peripheral wall of the swirl chamber 72 is formed in a tapered shape that widens toward the downstream side. Thereby, the flow passage area of the swirl chamber 72 is configured to become narrower from the position where the nozzle port 27a is formed to the downstream side. Therefore, the channel area at the downstream end of the swirl chamber 72 is narrower than the channel area at the position where the nozzle port 27a is formed.

  In this way, the flow passage area of the swirl chamber 72 is configured to be slightly restricted on the downstream side, so that the air ejected from the nozzle port 27a flows out to the taper chamber 73 side without sufficiently swirling in the swirl chamber 72. Can be prevented. Thereby, the flow velocity of the swirl airflow can be kept high until the swirl airflow is discharged from the swirl chamber 72 to the taper chamber 73.

  As described above, the pneumatic spinning device 9 of the present embodiment is an pneumatic spinning device that manufactures the spun yarn 10 by turning the fibers of the fiber bundle 8 using the swirling airflow, and includes the nozzle block 34, the hollow guide shaft, and the like. And a body 20. The nozzle block 34 includes a suction decompression chamber 71 and a swirl chamber 72 having a longer circumference than the suction decompression chamber 71. Further, the nozzle block 34 is formed with one or more air injection nozzles 27 that inject compressed air from a nozzle port 27 a that opens into the swirl chamber 72 to generate swirl airflow in the swirl chamber 72. A fiber passage 29 is formed inside the hollow guide shaft body 20. Further, the hollow guide shaft body 20 is arranged so that the distal end portion of the fiber passage 29 on the inlet hole 28 side is positioned in the suction decompression chamber 71. The nozzle port 27 a is set on the downstream side in the feeding direction of the fiber bundle with respect to the distal end portion of the hollow guide shaft body 20.

  Thus, the nozzle port 27a is formed on the swirl chamber 72 side, and the compressed air ejected from the nozzle port 27a is hollow by disposing the tip of the hollow guide shaft body 20 so as to be located in the suction decompression chamber 71. Since it can be prevented that the guide shaft body 20 expands in the vicinity of the front end of the guide shaft body 20, the reversal fiber 8 b can be prevented from floating at the front end of the hollow guide shaft body 20. That is, the reversal fiber 8b can be stably pressed against the tip of the hollow guide shaft body 20 by the compressed air. Further, by making the circumference of the suction decompression chamber 71 shorter than the circumference of the swirl chamber 72, the expanded compressed air is less likely to flow from the swirl chamber 72 toward the suction decompression chamber 71. As a result, the swirl component of the swirling airflow in the suction decompression chamber is reduced, and the air flow that gently flows toward the downstream side dominates the suction decompression chamber, so that the reversal of the fibers in the swirl chamber becomes smooth and the core fiber 8a An appropriate tension of the wound fiber can be stably obtained. As a result, the yarn strength of the produced spun yarn 10 is improved. Further, since the reversal fiber 8b is unlikely to lift from the surface of the hollow guide shaft body 20, stable spinning is possible even when the fiber turning speed is increased, and 500 m / min and 600 m, which have not been realized conventionally. / Min high speed spinning.

  Further, the pneumatic spinning device 9 of the present embodiment is configured as follows. That is, in the cross section when cut along a plane passing through the axis of the hollow guide shaft body 20, the portion on the suction decompression chamber 71 side in the swirl chamber forming surface 82 is a curved portion 82 a having a substantially curved cross section. Is formed.

  Accordingly, the swirl chamber 72 can be configured such that there is no angular portion on the wall surface on the suction decompression chamber 71 side, so that the air flow is prevented from being disturbed in the swirl chamber 72, and the air flow is smoothly made. It can flow. As a result, the wound fiber can be prevented from being irregularly wound around the core fiber or the free ends of the wound fiber can be entangled with each other, so that the quality of the generated yarn can be stabilized.

  Further, in the pneumatic spinning device 9 of the present embodiment, the entire opening contour of the nozzle port 27 a is formed in the curved portion 82 a of the swirl chamber forming surface 82.

  In this way, by forming the nozzle port 27a in the curved portion 82a, the elliptical perimeter of the opening contour of the nozzle port 27a can be increased. Thereby, compressed air can be injected so that it may spread from the nozzle opening 27a toward the swirl chamber, and the swirl airflow can be applied to the fiber in a wide range, so that the fiber can be swirled efficiently with a strong force. . Further, as described above, when the nozzle port 27a is formed in the curved portion 82a, the outlet shape of the injection nozzle does not change much even if the position where the nozzle port 27a is formed is slightly shifted. That is, by configuring the pneumatic spinning device 9 as described above, the quality of the generated yarn can be maintained regardless of the processing accuracy.

  Further, the pneumatic spinning device 9 of the present embodiment is configured as follows. That is, when viewed in a direction perpendicular to the center axis of the hollow guide shaft body 20 and perpendicular to the longitudinal direction of the air injection nozzle 27, the longitudinal direction of the air injection nozzle 27 is the center axis of the hollow guide shaft body 20. Is inclined at an angle of 70 degrees or more and 80 degrees or less.

  As a result, the balance between the speed in the swirling direction and the speed in the fiber feeding direction of the swirling airflow acting on the fibers in the swirling chamber 72 becomes particularly good during high-speed spinning. That is, the compressed air jetted from the air jet nozzle 27 formed as described above can cause the fibers to turn at a sufficient speed while generating a suction flow that pulls the fibers toward the downstream side in the fiber feeding direction. . As a result, the strength of the spun yarn 10 to be generated can be improved. Further, since the swirl component of the air acting on the fibers is maintained in the swirl chamber 72, the floating short fibers are sequentially caught and wound by the reversal fibers, and the fiber loss can be reduced.

  In the pneumatic spinning device 9 of the present embodiment, the flow passage cross-sectional area at the downstream end of the swirl chamber 72 is smaller than the flow passage cross-sectional area at the position where the nozzle port 27a of the swirl chamber 72 is formed. It is formed as follows.

  Thereby, the swirl airflow can be kept at a high speed until the swirl airflow is discharged from the swirl chamber 72. That is, since the fiber can be swirled at a high speed in the swirl chamber 72, the yarn strength of the spun yarn produced can be improved even in the case of high-speed spinning.

  The spinning machine 1 according to this embodiment includes the pneumatic spinning device 9 and a winding device 12 that winds the spun yarn 10 manufactured by the pneumatic spinning device 9 into a package 45.

  Thereby, even in the case of high-speed spinning, the spun yarn 10 with improved yarn strength can be generated, so that a high-quality package 45 can be efficiently formed at a higher speed than a conventional spinning machine.

  Next, a second embodiment of the present invention will be described. In the following description, the same or similar configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  The configuration of the pneumatic spinning device 9 provided in the spinning machine of the second embodiment is shown in FIG. As shown in FIG. 6, the pneumatic spinning device 9 of the present embodiment has a configuration in which the needle 22 provided in the fiber guide portion 23 in the first embodiment is omitted. Thus, the needle 22 can be omitted. In addition, in the said 1st Embodiment, although the needle 22 played the role as a twist propagation prevention means, when the needle 22 is abbreviate | omitted like this 2nd Embodiment, the downstream edge part of the fiber guide part 23 is the above-mentioned. It plays a role as a means for preventing twist propagation.

  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 embodiment, the swirl chamber 72 has a substantially cylindrical shape, but is not limited thereto. For example, as in the prior art of Patent Document 1, the outer peripheral wall of the swirl chamber (the first frustoconical space portion and the second conical space portion) may be formed in a substantially tapered shape. However, since the swirl chamber 72 needs to generate a swirling airflow therein, it is preferable that the cross-sectional shape when cut along a plane orthogonal to the fiber feeding direction is circular.

  Further, the shape of the suction decompression chamber 71 is a substantially cylindrical shape, but is not limited thereto. Further, in the suction decompression chamber 71, it is not always necessary to generate a swirling air flow therein, so that the cross-sectional shape when cut along a plane orthogonal to the fiber feeding direction does not have to be circular. However, even in this case, it is preferable that the outer peripheral length of the suction decompression chamber 71 is shorter than the outer peripheral length of the swirl chamber 72 in order to prevent an air flow from flowing into the suction decompression chamber 71 from the swirl chamber 72.

  Further, the curved portion 82a of the swirl chamber forming surface 82 may have any shape as long as the cross-sectional contour of the plane passing through the axis of the hollow guide shaft 20 does not have an arc shape, and the cross-sectional contour is a smooth curve. May be. In short, it is sufficient that there is no angular portion on the fiber guide portion 23 side of the swirl chamber 72. However, as described above, the turbulence of the air flow in the swirl chamber 72 can be suppressed particularly well by making the cross-sectional contour of the curved portion 82a arc.

  Further, the swirl chamber forming surface 82 may have a curved cross section as a whole. That is, the straight portion 82b can be omitted.

  In addition, when the cross-sectional outline of the curved part 82a can be regarded as a curve substantially, the said cross-sectional outline may be comprised from the fine broken line. For example, if the cross-sectional contour of the curved portion 82a is constituted by a bent line that is bent at an obtuse angle a plurality of times, it can be regarded as a substantially curved line.

  Moreover, the curved portion 82a does not have to be provided on the swirl chamber forming surface 82 as in the above embodiment, and the swirl chamber 72 may have an angular portion. For example, the curved portion 82a may be omitted, and the swirl chamber forming surface 82 may be configured with only the straight portion 82b.

  In the above embodiment, the entire opening contour of the nozzle port 27a of the air injection nozzle 27 is formed in the curved portion 82a. However, the present invention is not limited to this configuration. For example, only a part of the opening contour of the nozzle port 27a may be formed in the curved part 82a, and the remaining part may be formed in the straight part 82b. Further, the entire opening contour of the nozzle port 27a may be formed in the straight portion 82b. However, it is preferable to form at least a part of the opening contour of the nozzle port 27 a in the curved portion 82 a because compressed air can be injected from the nozzle port 27 a toward the inside of the swirl chamber 72.

  In the above embodiment, the nozzle block 34 serves as both the suction decompression chamber and the swirl chamber, but the suction decompression chamber and the swirl chamber may be separate members.

  In the above embodiment, the air discharge space 55 is formed in the nozzle casing 53, but the air discharge space 55 may be formed in the shaft body holding member 59. The air discharge space 55 may be formed by combining the nozzle portion casing 53 and the shaft body holding member 59.

  Moreover, although the said embodiment demonstrated the fine spinning machine 1 of the type in which the fiber bundle 8 (or spun yarn 10) is sent toward the bottom from the top, it is not restricted to this, For example, the spinning machine of the type which goes to the top from the bottom It may be. That is, the can in which the fiber bundle is stored is arranged at the lower part of the machine base, and the spinning machine in which the winding device is arranged at the upper part of the machine base may be configured to include the pneumatic spinning device of the above embodiment. good.

  The spinning machine 1 can also be configured to provide a yarn accumulating device between the yarn feeding device 11 and the winding device 12. This yarn accumulating device is simply explained. By temporarily winding the spun yarn 10 around the rotating yarn accumulating roller, a certain amount of spun yarn 10 can be accumulated on the yarn accumulating roller. It is composed. The function of this yarn accumulating device is as follows. That is, the winding device 12 cannot wind the spun yarn 10 while the yarn joining cart 3 is performing the yarn joining operation. In such a case, when the spun yarn 10 is sent out from the pneumatic spinning device 9 one after another, the spun yarn 10 that is not wound is loosened. Therefore, the yarn storage device is interposed between the winding device 12 and the yarn feeding device 11, and the spun yarn 10 is stored on the yarn storage roller during a period when the winding device 12 cannot wind the yarn. As a result, the spun yarn 10 can be prevented from being loosened.

  Note that the yarn storage device includes a yarn storage roller that winds and rotates the spun yarn. By rotating the yarn storage roller, the spun yarn 10 wound around the yarn storage roller is moved downstream. Can be sent out. That is, it can be said that the yarn storage device has a function of sending the spun yarn 10 toward the downstream side. Therefore, the spinning machine 1 provided with the yarn accumulating device as described above may be configured such that the yarn feeding device 11 is omitted and the spun yarn 10 from the pneumatic spinning device 9 is conveyed downstream by the yarn accumulating device. it can.

1 Spinning machine (spinning machine)
9 Pneumatic spinning device 20 Hollow guide shaft (spindle)
DESCRIPTION OF SYMBOLS 21 Fiber introduction hole 23 Fiber guide part 27 Air injection nozzle 27a Nozzle port 34 Nozzle block (a turning chamber part, a suction pressure reduction chamber part)
71 Suction decompression chamber 72 Swivel chamber 81 Suction decompression chamber forming surface 82 Swirl chamber forming surface 82a Curved portion

Claims (6)

An air spinning device for producing a spun yarn by swirling the fibers of a fiber bundle by a swirling airflow,
A suction decompression chamber formed with a suction decompression chamber;
A swirl chamber having a longer circumference than the suction decompression chamber is formed, and one or more air injection nozzles that generate the swirling airflow in the swirl chamber by injecting compressed air from a nozzle port that opens in the swirl chamber. A swirl chamber formed,
A spindle having a fiber passage formed therein;
With
The spindle is arranged such that a tip portion on the inlet side of the fiber passage is located in the suction decompression chamber,
The pneumatic spinning device according to claim 1, wherein the nozzle port is set on the downstream side in the feeding direction of the fiber bundle with respect to the tip of the spindle. The pneumatic spinning device according to claim 1,
In a cross section when cut along a plane passing through the axis of the spindle, at least a portion on the suction decompression chamber side of the inner wall surface of the swirl chamber portion forming the swirl chamber has a substantially curved cross section. An air spinning device characterized by being formed. The pneumatic spinning device according to claim 2,
At least a part of the opening contour of the nozzle opening has the cross-sectional contour formed in the curved portion of the inner wall surface of the swirl chamber portion that forms the swirl chamber. . The pneumatic spinning device according to any one of claims 1 to 3,
When viewed in a direction perpendicular to the central axis of the spindle and perpendicular to the longitudinal direction of the air injection nozzle,
The longitudinal direction of the air injection nozzle is inclined at an angle of 70 degrees or more and 80 degrees or less with respect to the central axis of the spindle. The pneumatic spinning device according to any one of claims 1 to 4, wherein
A pneumatic spinning device characterized in that a flow passage cross-sectional area at a downstream end of the swirl chamber is formed to be smaller than a flow passage cross-sectional area at a position where the nozzle port of the swirl chamber is formed. . An air spinning device according to any one of claims 1 to 5;
A winding device for winding the spun yarn produced by the pneumatic spinning device into a package;
A spinning machine characterized by comprising:

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