JP5515934B2 - Pneumatic spinning device and spinning machine - Google Patents

Description

  The present invention mainly relates to a pneumatic spinning device. Specifically, the present invention relates to the shape of a swirl chamber that is a space for generating a swirling airflow in an air spinning device.

  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 swirl chamber and an air injection nozzle that generates a swirl airflow in the swirl chamber by injecting compressed air into the swirl chamber. And the fiber which received the effect | action of the said swirl | vortex airflow swirls in a swirl | vortex chamber, a twist is added to a fiber and a spun yarn is produced | generated.

  In this way, since the fibers are twisted by the swirling airflow to form spun yarn, the quality of the spun yarn greatly depends on the flow of the swirling airflow. Therefore, conventionally, a device has been devised for the shape of the swirl chamber that generates the swirl airflow.

  For example, Patent Document 1 discloses a swirl chamber (a wall surface of a first frustoconical space portion and a second frustoconical space portion, and an outer peripheral wall surface of a first frustoconical portion of a hollow guide shaft body, which is a space in which a swirling airflow is generated. And a portion corresponding to a space formed between the two) discloses a spinning device formed in a tapered cylindrical shape. As shown in FIG. 5 and the like of Patent Document 1, this tapered cylindrical swirl chamber has an outer peripheral wall surface (inner peripheral wall of the nozzle block) and an inner peripheral side as it goes downstream in the fiber feeding direction. The wall surface (the outer peripheral wall of the hollow guide shaft body) is formed so as to have a larger diameter. It is considered that the swirling airflow can be smoothly flowed toward the downstream side by forming the swirl chamber in a divergent shape in this manner.

  Moreover, patent document 1 is disclosing the structure provided with the protrusion part as an aperture | diaphragm | squeeze part in the inner peripheral wall surface of a nozzle block. Patent Document 1 discloses that the ratio of the swirling component and the swirling component of the swirling airflow can be adjusted by appropriately setting the cross-sectional area of the swirling chamber in the protruding portion. By increasing the protruding amount of the protruding portion, the swirling airflow can be strongly swirled in the swirling chamber as much as the swirling airflow hardly flows downstream.

  On the other hand, Patent Document 2 discloses a spinning device in which a swirl chamber (a swirl airflow generation chamber) is formed in a cylindrical shape. The width of the flow path of the cylindrical swirl chamber (the distance between the inner peripheral wall of the nozzle block and the outer peripheral wall of the spindle) is constant within a predetermined height range. Further, Patent Document 2 is configured such that the outlet diameter D of the air nozzle (air injection nozzle) has a relationship of 0.7D ≦ S ≦ 1.3D, where S is the width of the flow path of the swirl chamber. Thus, it is disclosed that a spun yarn having a predetermined yarn strength can be manufactured.

JP 2003-193337 A JP 2008-297688 A

  When the swirl chamber is formed in a divergent shape as in Patent Document 1, the swirl diameter of the swirl airflow increases as it goes downstream, and as a result, the fiber cannot swirl at high speed on the downstream side. . Moreover, when the swirl chamber is formed in a divergent shape as in Patent Document 1 and the width of the flow path is constant, the cross-sectional area of the swirl chamber increases as it goes downstream of the swirl chamber. As a result, the compressed air expands in the swirl chamber, the flow velocity decreases, and the swirl flow density also decreases. Therefore, the configuration of Patent Document 1 has a limit in spinning speed, and the productivity of the spinning device cannot be improved.

In Patent Document 1, although the effect that can generate a spun yarn of a desired yarn strength is described by swirling chamber cross-sectional area of the (space) and 7mm ² ~12mm ² in the protruding portion, the cross-sectional The relationship between the area and the diameter of the air injection nozzle is not described (in addition, specific numerical values of the diameter of the air injection nozzle are not described). In this regard, referring to FIG. 5 of Patent Document 1, the width of the flow path of the swirl chamber (the gap between the inner peripheral surface of the nozzle block and the surface of the hollow guide shaft body) is about 6 times the diameter of the air injection nozzle. Presumed. Thus, if the width of the swirl chamber is too large with respect to the nozzle outlet, the air blown from the air injection nozzle expands in the spinning chamber and the flow velocity of the swirl airflow decreases, so that a high-speed swirl flow is maintained. Is difficult. The configuration of Patent Document 1 is also limited in spinning speed in this respect.

  On the other hand, in Patent Document 2, since the swirl chamber is formed in a cylindrical shape, the swirl radius of the swirl airflow does not increase even on the downstream side of the swirl chamber. Accordingly, it is considered that the fiber swirl speed can be maintained on the downstream side of the swirl chamber as compared with the configuration in which the swirl chamber is widened like Patent Document 1. However, the configuration of Patent Document 2 does not include the projecting portion (throttle portion) described in Patent Document 1. For this reason, in the configuration of Patent Document 2, the swirling airflow in the swirl chamber tends to flow downstream without sufficiently swirling. For this reason, in order to sufficiently swirl the fibers in the swirl chamber, the height dimension (dimension in the fiber flow direction) of the swirl chamber is increased to increase the distance over which the swirl airflow acts on the fibers. Such measures are necessary. Actually, referring to FIG. 2 of Patent Document 2, the height of the swirl chamber is formed to be larger than the diameter of the swirl chamber.

  When the swirl chamber is formed high in this way, the distance that the compressed air swirls at a high speed in the swirl chamber becomes longer, so that the energy consumption (consumption flow rate) for flowing the swirling airflow increases. That is, in the configuration of Patent Document 2, it is difficult to maintain the fiber turning speed unless a large amount of energy is consumed. As a result, the speed of the swirling air flow is reduced on the downstream side of the swirl chamber, and the fibers cannot be swirled at a high speed. As described above, the configuration of Patent Document 2 is also limited in terms of improving the productivity by increasing the spinning speed. Moreover, there is also a problem that the apparatus becomes larger by making the swirl chamber higher in this way.

  Patent Document 2 discloses that 0.7D ≦ S ≦ 1.3D. However, if S = 0.7D, the diameter of the nozzle outlet is larger than the width of the flow path of the swirl chamber. Will be bigger. In this case, the air ejected from the nozzle outlet expands in a distorted shape in the swirl chamber, and interferes with the air ejected from other adjacent nozzle outlets, resulting in air turbulence in the swirl chamber. . Moreover, when the width of the flow path of the swirl chamber is narrower than the diameter of the nozzle outlet, it is conceivable that the swirl chamber cannot allow a large amount of ejected air. In this case, as a result of the jet air flowing out from the swirl chamber to the upstream reversing chamber (suction decompression chamber), it becomes impossible to guide the fiber bundle into the reversing chamber, and the suction flow rate in the suction decompressing chamber is reduced. The problem of becoming smaller occurs. On the other hand, even if S = 1.3D, considering that the jet flow expands in the swirl chamber, the flow path width of the swirl chamber is smaller than the diameter of the nozzle outlet.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide an air spinning device capable of rotating fibers at high speed and stably in a swirl chamber.

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 in a substantially cylindrical swirling chamber, wherein the air spinning device is configured as follows. An apparatus is provided. That is, this pneumatic spinning device includes a spindle and a swirl chamber. The spindle is at least partially located in the swirl chamber. The swirl chamber is formed in the swirl chamber. 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. The swirl chamber is formed longer in the radial direction than the space communicating with the swirl chamber on the upstream side in the fiber feeding direction. The swirl chamber includes a cylindrical portion formed in a substantially cylindrical shape having a constant diameter. An end of the cylindrical portion on the downstream side in the fiber feeding direction constitutes a downstream end of the swirl chamber. The height of the swirl chamber in the fiber feeding direction is not more than the diameter. And the flow path cross-sectional area of the downstream end of the swirl chamber in the fiber feeding direction is formed to be smaller than the flow path cross-sectional area of the swirl chamber at the downstream end of the opening contour of the nozzle port. .

  In this way, by making the diameter of the swirl chamber constant, the swirl radius of the swirl airflow does not increase even on the downstream side of the swirl chamber, so the swirl flow is increased until the swirl airflow is discharged downstream of the swirl chamber. Can be kept in. Thereby, since the wound fiber can be swung at a high speed, the yarn strength of the spun yarn to be generated can be improved. As a result, high-speed spinning at 500 m / min or 600 m / min, which could not be realized conventionally, can be realized. Further, since the flow passage cross-sectional area at the downstream end of the swirl chamber is formed small, the swirling airflow in the swirl chamber is less likely to flow downstream. This allows the swirling airflow in the swirl chamber to flow while maintaining the blowing angle from the air injection nozzle and maintaining a high speed while suppressing a decrease in speed, so that the yarn strength of the spun yarn generated can be kept stable. Can do. And by comprising as mentioned above, since a swirl | vortex airflow can be made to act effectively with respect to a fiber bundle even with a short distance, the height of a swirl | vortex chamber can be made low. For example, as described above, the height of the swirl chamber can be made smaller than the diameter. Thereby, there is little energy consumption for flowing a swirling airflow, and energy saving can be realized. In addition, the pneumatic spinning device can be configured compactly in the height direction.

  The pneumatic spinning device is preferably configured as follows. That is, the distance between the inner wall surface of the swirl chamber portion that forms the swirl chamber and the outer peripheral surface of the spindle at the downstream end of the opening contour of the nozzle opening is 1 of the drilling diameter of the air injection nozzle. .3 to 2.5 times.

  Thereby, the width of the flow path of the swirl chamber can be appropriately formed with respect to the compressed air injected from the air injection nozzle. Therefore, it is possible to prevent the compressed air injected from the air injection nozzle from expanding due to the flow path being too wide or distorting because the flow path is too narrow.

  The pneumatic spinning device is preferably configured as follows. That is, the distance between the inner wall surface of the swirl chamber portion that forms the swirl chamber and the outer peripheral surface of the spindle at the downstream end of the opening contour of the nozzle opening is 1 of the drilling diameter of the air injection nozzle. .5 times or more and 2.0 times or less.

  Thereby, the width | variety of the flow path of a turning chamber can be formed more appropriately with respect to the compressed air injected from an air injection nozzle.

  In the pneumatic spinning device, the spindle is a portion of the portion located in the swirl chamber, the diameter of the portion located on the upstream side in the fiber feeding direction is the portion located on the downstream side in the fiber feeding direction. It is preferable that it be formed smaller than the diameter.

  Thereby, since the width of the flow path on the downstream side of the swirl chamber can be prevented from being widened, it is possible to prevent the swirling airflow in the swirl chamber from flowing out to the downstream side without sufficiently swirling. As a result, it becomes possible to maintain a high-speed swirling air flow in the swirl chamber. As a result, even in the case of high-speed spinning such as 500 m / min or 600 m / min, the wound fiber is swirled sufficiently in the swirl chamber. Can be wound around the core fiber.

  In the pneumatic spinning device, a ratio of the height of the swirl chamber to the diameter of the swirl chamber is preferably 0.4 or more and 1.0 or less.

  Thus, by setting the height of the swirl chamber to be equal to or smaller than the diameter, less energy is consumed for flowing the swirling airflow into the swirl chamber, and energy saving can be realized. In addition, the pneumatic spinning device can be configured compactly in the height direction. In addition, as described above, by setting the height of the swirl chamber to be 0.4 times or more of the diameter, the space of the swirl chamber for causing the swirling airflow to act on the wound fiber does not become too short. A swirling airflow can be effectively applied to the attached fibers.

  In the pneumatic spinning device, the air injection nozzle is preferably formed so as to inject compressed air into the swirl chamber.

  As a result, the compressed air ejected from the air injection nozzle can be exhausted after being swirled in the swirl chamber. Therefore, even in the case of high-speed spinning, the wound fiber is swirled sufficiently in the swirl chamber to be the core fiber. Can be wrapped around.

  According to a second aspect of the present invention, a spinning machine configured as follows is provided. That is, this spinning machine includes the above-described pneumatic spinning device, a draft device, a drawing device, and a winding device. The draft device is disposed upstream of the pneumatic spinning device and drafts the fiber bundle. The drawing device is arranged on the downstream side of the pneumatic spinning device, and draws the spun yarn produced by the pneumatic spinning device from the pneumatic spinning device. The device winds the spun yarn pulled out by the pulling device into a package.

  As a result, a spun yarn having high yarn strength can be generated even with high-speed spinning, so that the quality and productivity of the package wound with the spun yarn can be improved.

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 of an air spinning apparatus. 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 (drawing 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 generated by the pneumatic spinning device 9 is drawn from the pneumatic spinning device 9 by the yarn feeding device 11 and sent to the downstream side, 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 manufactured by 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), whereby the spun yarn 10 is removed from the pneumatic spinning device 9. It can be pulled out and sent to the winding device 12 side.

  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 (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 first tapered portion 24 whose diameter increases toward the downstream side is formed at one end of the cylindrical body 56. A second taper portion 25 that is continuous with the first taper portion 24 and has a larger taper angle than the first taper portion 24 is formed on the downstream side of the first taper portion 24. An inlet hole 28 is formed at the tip of the first taper 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 first taper portion 24 and the second taper portion 25 of the hollow guide shaft body 20 have an axis line in 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. Inserted with matching. Further, an air flow can pass between the outer peripheral surfaces of the first tapered portion 24 and the second tapered portion 25 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). There is a predetermined interval.

  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 swirl chamber 72 are constituted by the outer peripheral surface 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). And a tapered chamber 73 having a substantially tapered cylindrical shape. 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, a part of the hollow guide shaft body 20 is inserted into the swirl chamber 72, and a part of the outer peripheral surface of the first taper portion 24 is a swirl chamber 72. The wall surface of the inner peripheral side of is constructed. Therefore, the inner peripheral wall surface of the substantially cylindrical swirl chamber 72 has a tapered shape whose diameter increases toward the downstream side.

  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 four air injection nozzles 27 that connect the swirl chamber 72 and the supply air storage chamber 61. These air injection nozzles 27 are configured as elongated round holes formed in the nozzle block 34. The four air injection nozzles 27 are arranged at equal intervals in the circumferential direction of the swirl chamber 72. 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, the reversal fiber 8b swirls around the first taper portion 24 of the hollow guide shaft body 20 while being along the surface of the first taper portion 24 of the hollow guide shaft body 20, as shown in FIG. To do. 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, since the reversal fiber 8b is pressed against the surface of the first taper portion 24 of the hollow guide shaft body 20 by the force of flowing toward the downstream side of the swirling airflow, the free end is prevented from being violated and stably. The periphery of the first tapered portion 24 of the hollow guide shaft body 20 can be swung.

  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 first taper portion 24 of the hollow guide shaft body 20 by the force to flow downstream of the swirling airflow, the reversal fiber 8b is dragged into the fiber passage 29. Appropriate 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 fiber that has not been twisted into the spun yarn 10 due to cutting or the like during the above-described opening and twisting is sent to the air discharge space 55 from the swirling chamber 72 through the taper chamber 73 along the flow of airflow. By the suction of the negative pressure source, it is discharged via the pipe 60.

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

  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.

  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. In the present embodiment, the cross-sectional contour of the curved portion 82a is specifically an arc shape.

  By thus configuring the swirl chamber 72 so that there are no angular portions, the turbulence of the air flow in the swirl chamber 72 can be reduced. Accordingly, 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 first taper portion 24 of the hollow guide shaft body 20, and a high quality yarn. Can be stably generated.

  In addition, in the cross-sectional view of FIG. 4, the cross-sectional contour line of the straight portion 82 b is parallel to the central axis 90. That is, the diameter of the swirl chamber 72 is constant in the height direction in the straight portion 82b. Therefore, it can be said that the portion corresponding to the straight portion 82b of the swirl chamber 72 is a cylindrical portion having a substantially cylindrical diameter.

  That is, when the diameter of the swirl chamber increases toward the downstream side as in Patent Document 1, the swirl diameter of the swirl airflow increases on the downstream side of the swirl chamber, so that the fibers can be swung at high speed. It becomes impossible. In this regard, by making the diameter of at least a part of the swirl chamber 72 constant as in the present embodiment, the swirl diameter of the swirl airflow does not change even on the downstream side of the swirl chamber, so that the fiber swirl speed can be maintained. it can.

  Further, in the present embodiment, the diameter D1 of the suction decompression chamber forming surface 81 is formed to be smaller than the diameter D2 of the swirl chamber forming surface 82 (more precisely, the diameter of the straight portion 82b). Thus, even if the compressed air ejected into the swirl chamber 72 is expanded by making the diameter of the suction decompression chamber 71 shorter than that of the swirl chamber 72, the compressed air is expanded into the suction decompression chamber 71 side ( It is possible to make it difficult to flow to the upstream side. 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.

  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.

  In the present embodiment, the air injection nozzle 27 is formed so as to inject compressed air with the aim of the inside of the swirl chamber 72. More specifically, the target position of the air injection nozzle 27 (the position indicated by A1 in FIG. 4) is more than the downstream end of the swirl chamber 72 (the position indicated by A2 in FIG. 4). It is formed to be on the upstream side. The “target position” refers to the central axis 27b of the air injection nozzle 27 when projected onto a plane parallel to the central axis 27b of the air injection nozzle 27 and parallel to the central axis 90 of the hollow guide shaft body 20. The point where the central axis 90 of the hollow guide shaft 20 intersects.

  With this configuration, the swirling airflow can be discharged into the tapered chamber 73 after swirling in the swirling chamber 72.

  Further, the target position of the air injection nozzle 27 (the position indicated by A1 in FIG. 4) needs to be set so that the swirling flow is discharged after being swirled to some extent in the swirling chamber 72. That is, a configuration in which the target position A1 is set on the downstream side so that the swirling flow cannot swirl in the swirling chamber 72 cannot be employed.

  From the above viewpoint, it is preferable that the target position is set as follows. That is, when the height of the swirl chamber 72 (the length of the swirl chamber forming surface 82 in the fiber feeding direction) is H1, the target position A1 of the air injection nozzle 27 is H1 × 3 / from the downstream end of the swirl chamber 72. It is preferable that it is set to 8 or more upstream. Further, it is more preferable that the target position A1 is set at an upstream side of H1 × ½ or more from the downstream side end portion of the swirl chamber 72. Thus, by setting the target position A1 of the air injection nozzle 27 to a position closer to the upstream side of the swirl chamber 72, the distance that the air blown from the air injection nozzle 27 flows toward the downstream side in the swirl chamber 72 can be increased. Can be secured. That is, the jet air can be sufficiently swirled in the swirl chamber 72.

  The target position of the air injection nozzle 27 (the position indicated by A1 in FIG. 4) is set on the downstream side of the upstream end of the hollow guide shaft body 20. As a result, a swirling airflow can be generated satisfactorily around the hollow guide shaft body 20 and the reversal fibers 8b can be sufficiently swirled, so that a strong spun yarn 10 can be generated.

  In this embodiment, the flow passage cross-sectional area of the swirl chamber 72 at the downstream end of the swirl chamber 72 (the flow passage cross-sectional area at the position A2 in FIG. 4) is determined by the nozzle port 27a of the air injection nozzle 27. It is smaller than the cross-sectional area of the swirl chamber 72 at the formed position (specifically, the position of the downstream end of the opening contour of the nozzle port 27a) (the cross-sectional area at the position A3 in FIG. 4). It is comprised so that it may become. The “flow channel cross-sectional area” refers to a cross-sectional area of the swirl chamber 72 when cut along a plane perpendicular to the fiber feeding direction (the axial direction of the hollow guide shaft body 20).

  More specifically, in the present embodiment, in the cylindrical portion of the swirl chamber 72, the diameter of the straight portion 82 b forming the wall surface on the outer peripheral side of the swirl chamber 72 is constant, The outer peripheral wall surface of the first taper portion 24 of the hollow guide shaft body 20 constituting the peripheral wall surface is formed in a tapered shape that widens toward the downstream side. That is, in the cylindrical portion of the swirl chamber 72, the flow path cross-sectional area is configured to become narrower toward the downstream side. As a result, the channel cross-sectional area at the downstream end of the swirl chamber 72 is narrower than the channel cross-sectional area at the target position of the air injection nozzle 27.

  In addition, although the 1st taper part 24 of the hollow guide shaft body 20 is formed so that a diameter may become large toward the downstream of a yarn feeding direction as mentioned above, the change of the said diameter may be gradual. preferable. However, it is also possible to adopt a configuration in which the diameter of the hollow guide shaft body 20 changes abruptly in the yarn feeding direction.

  As described above, the flow passage cross-sectional area of the swirl chamber 72 is configured so as to be slightly restricted on the downstream side, so that the air blown from the nozzle port 27a does not swirl sufficiently in the swirl chamber 72 and is on the taper chamber 73 side. Can be prevented from leaking. 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.

  With regard to this point, when the present inventor conducted an experiment, in order to keep the swirling airflow in the swirl chamber 72 at a high speed, the flow path cross section (at the position of A2 in FIG. 4) at the downstream end of the swirl chamber 72. In the cross section of the flow path), it has been found that it is effective to keep the average flow velocity of the air flow around 200 m / sec. That is, unless the average flow velocity at this position is maintained at 200 m / sec, the balance between the suction flow rate of the fiber introduction hole 21 and the injection flow rate from the nozzle port 27a of the air injection nozzle 27 is disturbed.

In order to maintain the above average flow velocity, the cross-sectional area of the downstream end of the swirl chamber 72 (the cross-sectional area at the position A2 in FIG. 4) is 7.5 mm ² or more and 12.0 mm ² or less. Is preferred. Furthermore, it is preferable that the compressed air injected from the nozzle port 27a is not distorted or spread too much in the swirl chamber 72 while satisfying the above conditions.

  As a result of the above-mentioned experiment, the inventor of the present application swivels at the position A3 where the nozzle port 27a is formed (to be precise, the position of the downstream end of the opening contour of the nozzle port 27a) in order to satisfy the above condition. It has been found that the interval (passage width of the swirl chamber 72) T1 between the chamber forming surface 82 and the outer peripheral wall of the first tapered portion 24 of the hollow guide shaft body 20 may be set as follows. That is, the interval T1 is preferably 1.3 times or more and 2.5 times or more the perforation diameter D3 of the air injection nozzle 27 (diameter in a plane orthogonal to the longitudinal direction of the air injection nozzle 27), and 1.5 It is more preferable that it is not less than twice and not more than 2.0 times.

  Therefore, in the present embodiment, the interval T1 is set to be 1.5 times or more and 2.0 times or less of the perforation diameter D3 of the air injection nozzle 27. Thereby, the space | interval (width | variety of the turning chamber 72) of the turning chamber formation surface 82 and the 1st taper part 24 with respect to the compressed air injected from the air injection nozzle 27 does not become too narrow or too wide. Therefore, it is possible to prevent the compressed air ejected from the air injection nozzle 27 from being distorted in the swirl chamber 72 or rapidly expanding in the swirl chamber 72, so that air turbulence in the swirl chamber 72 is prevented. It is possible to generate a high-speed and high-density stable swirling airflow, and the suction flow rate of the fiber introduction hole 21 is also stable.

  As described above, since the flow velocity of the swirling airflow can be maintained by the configuration of the present embodiment, the swirling is compared with a conventional pneumatic spinning device having a swirling chamber having the same height (length in the fiber feeding direction). The force that acts on the reversal fiber 8b in the chamber 72 can be increased. In other words, according to the configuration of the present invention, even if the height of the swirl chamber 72 is made lower than that of the conventional pneumatic spinning device (the length of the space in which the swirl airflow acts on the reversal fiber 8b). Even if it is shortened, the reversal fiber 8b can be swirled with the same level of force as the conventional pneumatic spinning device.

  Therefore, in this embodiment, the height (length in the fiber feeding direction) H1 of the swirl chamber forming surface 82 is equal to or less than the diameter D2 of the swirl chamber forming surface 82 (more precisely, the diameter of the straight portion 82b). Is formed. In other words, the swirl chamber 72 is formed such that its height H1 is equal to or less than its diameter D2.

  Thus, since the height of the swirl chamber 72 can be reduced, the energy required for flowing the swirl airflow into the swirl chamber 72 can be reduced. Further, the pneumatic spinning device 9 can be configured to be compact in the height direction.

  However, if the height of the swirl chamber 72 is too low, the swirl airflow cannot be sufficiently applied to the reversal fibers 8b. Therefore, the height H1 of the swirl chamber 72 is set to 0.4 times or more the diameter D2 of the swirl chamber 72.

  As described above, the pneumatic spinning device 9 of the present embodiment is an pneumatic spinning device that manufactures the spun yarn 10 by causing the fibers of the fiber bundle 8 to swirl in a substantially cylindrical swirl chamber 72 by swirling airflow. The configuration is as follows. That is, the pneumatic spinning device 9 includes a hollow guide shaft body 20 and a nozzle block 34. A part of the hollow guide shaft body 20 is located in the swirl chamber 72. A swirl chamber forming surface 82 is formed on the nozzle block 34. The nozzle block 34 is formed with four air injection nozzles 27 that generate compressed air from the nozzle openings 27 a that open in the swirl chamber 72 to generate swirl airflow in the swirl chamber 72. The swirl chamber 72 includes a cylindrical portion formed as a substantially cylindrical shape having a constant diameter D2. The height H1 of the swirl chamber 72 is not more than the diameter D2. The flow path cross-sectional area at the downstream end (A2 position) in the fiber feeding direction of the swirl chamber 72 is the flow path breakage of the swirl chamber 72 at the downstream end (position A3) of the opening contour of the nozzle port 27a. It is formed to be smaller than the area.

  Thus, by making the diameter D2 of the swirl chamber 72 constant, the swirl radius of the swirl airflow does not increase even on the downstream side of the swirl chamber 72, so the swirl airflow is discharged to the downstream side of the swirl chamber 72. The swirl flow can be maintained at a high speed, and the angle of the swirl airflow in the swirl chamber 72 (injection angle from the nozzle port 27a) can be easily maintained. Thereby, since the wound fiber can be swung at a high speed, the yarn strength of the spun yarn to be generated can be improved. As a result, high-speed spinning at 500 m / min or 600 m / min, which could not be realized conventionally, can be realized. Moreover, since the flow path cross-sectional area at the downstream end of the swirl chamber 72 is formed small, the swirling airflow in the swirl chamber 72 is difficult to flow out downstream. Accordingly, the swirling air flow in the swirl chamber 72 can be flowed while maintaining the spray angle from the air injection nozzle 27 and suppressing the decrease in speed while maintaining a high speed. It can be kept stable. By configuring the pneumatic spinning device 9 as described above, the swirl airflow can be effectively applied to the fiber bundle 8 even at a short distance, and therefore the height H1 of the swirl chamber 72 can be lowered. . Therefore, for example, as described above, the height H1 of the swirl chamber 72 can be set to a diameter D2 or less. Thereby, there is little energy consumption for flowing a swirling airflow, and energy saving can be realized. Further, the pneumatic spinning device 9 can be configured compactly in the height direction.

  Further, the pneumatic spinning device 9 of the present embodiment is configured as follows. That is, at the downstream end (position A3) of the opening contour of the nozzle port 27a, the interval T1 between the swirl chamber forming surface 82 and the outer peripheral surface of the hollow guide shaft 20 is 1 of the drilling diameter D3 of the air injection nozzle. .5 times or more and 2.0 times or less.

  Thereby, the width of the flow path of the swirl chamber 72 can be appropriately formed with respect to the compressed air injected from the air injection nozzle 27. Therefore, the compressed air injected from the air injection nozzle 27 expands too much when the flow path of the swirl chamber 72 is too wide, and the flow velocity is lowered, or the flow path of the swirl chamber 72 is too narrow and is distorted. Can be prevented.

  Further, the pneumatic spinning device 9 of the present embodiment is configured as follows. That is, the hollow guide shaft body 20 has a diameter of a portion located on the upstream side in the fiber feeding direction in the first taper portion 24 located in the swirl chamber 72 located on the downstream side in the fiber feeding direction. It is formed smaller than the diameter of the part.

  Thereby, since the width of the flow path on the downstream side of the swirl chamber 72 can be prevented from increasing, it is possible to suppress the swirling airflow in the swirl chamber 72 from flowing out downstream without sufficiently swirling. Can do. As a result, it becomes possible to maintain a high-speed swirling air flow in the swirl chamber 72. As a result, even in the case of high-speed spinning such as 500 m / min or 600 m / min, the wound fiber is placed in the swirl chamber 72. Can be swirled sufficiently to wind around the core fiber.

  In the pneumatic spinning device 9 of the present embodiment, the ratio of the height H1 of the swirl chamber 72 to the diameter D2 of the swirl chamber 72 is 0.4 or more and 1.0 or less.

  Thus, by setting the height H1 of the swirl chamber 72 to be equal to or smaller than the diameter D2, less energy is consumed for flowing the swirling air flow into the swirl chamber 72, and energy saving can be realized. Further, the pneumatic spinning device 9 can be configured compactly in the height direction. In addition, as described above, by setting the height H1 of the swirl chamber 72 to 0.4 times the diameter D2 or more, the space of the swirl chamber 72 for causing the swirl airflow to act on the wound fiber may become too short. Since there is no, a swirl airflow can be made to act effectively with respect to a wound fiber.

  In the pneumatic spinning device 9 of the present embodiment, the air injection nozzle 27 is formed so as to inject compressed air into the swirl chamber 72.

  As a result, the compressed air ejected from the air injection nozzle 27 can be exhausted after being swirled in the swirl chamber 72, so that even in the case of high-speed spinning, the wound fiber can be sufficiently removed in the swirl chamber 72. It can be swung and wound around the core fiber.

  The spinning machine 1 according to the present embodiment includes the pneumatic spinning device 9, the draft device 7, the yarn feeding device 11, and the winding device 12. The draft device 7 is arranged on the upstream side of the pneumatic spinning device 9 and drafts the fiber bundle. The drawing device is arranged on the downstream side of the pneumatic spinning device, and draws the spun yarn produced by the pneumatic spinning device from the pneumatic spinning device. The device winds the spun yarn pulled out by the pulling device into a package.

  As a result, a spun yarn having high yarn strength can be generated even with high-speed spinning, so that the quality and productivity of the package wound with the spun yarn can be improved.

  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 distal end portion of the hollow guide shaft body 20 is slightly inserted into the suction decompression chamber 71. However, the present invention is not limited thereto, and the hollow guide shaft body 20 is inserted into the suction decompression chamber 71. A configuration in which the tip of the hollow guide shaft body 20 is positioned on the boundary line between the suction decompression chamber 71 and the swirl chamber 72 may be employed.

  In the above embodiment, four air injection nozzles 27 are formed, but any number of air injection nozzles 27 may be formed as long as it is one or more. For example, six air injection nozzles 27 can be formed. However, when the number of air injection nozzles 27 is 5 or more, in order to appropriately adjust the amount of air supplied to the swirl chamber 72, the perforation diameter D3 is set to be larger than that in the embodiment in which the number of air injection nozzles 27 is four. It needs to be small. Further, when the number of air injection nozzles 27 to be formed increases, it becomes difficult to increase the processing accuracy. Therefore, it is particularly preferable that the number of the air injection nozzles 27 is four as described above.

  In the above-described embodiment, the suction decompression chamber 71 has a substantially cylindrical shape, but is not limited thereto. Further, since the suction decompression chamber 71 does not necessarily need to generate a swirling air flow therein, the cross-sectional shape when cut along a plane orthogonal to the fiber feeding direction may not be circular.

  The suction decompression chamber 71 can be omitted (the swirl chamber 72 may be in direct communication with the fiber introduction hole 21). However, since the fibers can be smoothly reversed by the presence of the suction decompression chamber 71, it is preferable not to omit the suction decompression chamber 71.

  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.

  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 by only the straight portion 82b.

  In the above-described embodiment, the nozzle block 34 serves as the suction decompression chamber and the swirl chamber in which the swirl chamber is formed. However, the suction decompression chamber and the swirl chamber may be separate members.

  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 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 can be configured such that the yarn feeding device 11 is omitted and the spun yarn 10 from the pneumatic spinning device 9 is drawn downstream by the yarn accumulating device. . In this case, this yarn accumulating device can be grasped as a drawing device.

1 Spinning machine (spinning machine)
9 Pneumatic spinning device 20 Hollow guide shaft (spindle)
21 Fiber introduction hole 23 Fiber guide portion 27 Air injection nozzle 27a Nozzle port 34 Nozzle block (swirl chamber portion)
71 Suction decompression chamber 72 Swirl chamber 82 Swirl chamber forming surface 82a Curved section

Claims (7)

An air spinning device for producing a spun yarn by swirling fibers of a fiber bundle by a swirling airflow in a substantially cylindrical swirling chamber,
A spindle at least partially located in the swivel chamber;
A swirl chamber portion in which the swirl chamber is formed, and one or more air injection nozzles are formed to generate the swirl airflow in the swirl chamber by injecting compressed air from a nozzle opening opened in the swirl chamber;
With
The swirl chamber is formed longer in the radial direction than the space communicating with the swirl chamber upstream in the fiber feeding direction,
The swirl chamber includes a cylindrical portion formed as a substantially cylindrical shape having a constant diameter,
The downstream end of the cylindrical portion in the fiber feeding direction constitutes the downstream end of the swirl chamber,
The height of the swirl chamber in the fiber feeding direction is less than or equal to the diameter;
The flow passage cross-sectional area at the downstream end of the swirl chamber in the fiber feeding direction is formed to be smaller than the flow passage cross-sectional area of the swirl chamber at the downstream end of the opening contour of the nozzle port. A featured pneumatic spinning device. The pneumatic spinning device according to claim 1,
The distance between the inner wall surface of the swirl chamber that forms the swirl chamber and the outer peripheral surface of the spindle at the downstream end of the opening contour of the nozzle opening is 1.3 of the perforation diameter of the air injection nozzle. An air spinning device characterized by being not less than 2.5 times and not more than 2.5 times. The pneumatic spinning device according to claim 2,
The interval between the inner wall surface of the swirl chamber portion that forms the swirl chamber and the outer peripheral surface of the spindle at the downstream end of the opening contour of the nozzle opening is 1.5 times or more the perforation diameter of the air injection nozzle. An air spinning device characterized by being 0 times or less. The pneumatic spinning device according to any one of claims 1 to 3,
The spindle is formed such that, of the portions located in the swirl chamber, the diameter of the portion located upstream in the fiber feeding direction is smaller than the diameter of the portion located downstream in the fiber feeding direction. A pneumatic spinning device characterized by having The pneumatic spinning device according to any one of claims 1 to 4, wherein
The ratio of the height of the swirl chamber to the diameter of the swirl chamber is 0.4 to 1.0 inclusive. The pneumatic spinning device according to any one of claims 1 to 5,
In the pneumatic spinning device, the pneumatic spinning device is configured to jet the compressed air into the swirl chamber so as to aim at compressed air. The pneumatic spinning device according to any one of claims 1 to 6,
A draft device arranged on the upstream side of the pneumatic spinning device for drafting the fiber bundle;
A draw-out device that is arranged on the downstream side of the pneumatic spinning device and draws out the spun yarn produced by the pneumatic spinning device from the pneumatic spinning device;
A winding device for winding the spun yarn drawn out by the drawing device into a package;
A spinning machine characterized by comprising

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