Air spinning device, air spinning machine and spinning method

Abstract

The present invention provides an air spinning device, an air spinning machine and a spinning method capable of spinning high-quality spun yarn. The air spinning device (4) generates spun yarn (Y) by twisting a fiber bundle (F) with a swirling air flow. The air spinning device (4) comprises a fiber guide (41a), a nozzle block (41b) and a nozzle head (41c). The fiber guide (41a) guides the fiber bundle (F). A nozzle for passing compressed air is formed in the nozzle block (41b), wherein the compressed air is used to generate a swirling air flow acting on the fiber bundle (F) guided by the fiber guide (41a). An inflow chamber (7) for spinning the fiber bundle (F) is formed in the nozzle head (41c). The inflow chamber (7) has a portion with a diameter of not less than 25 mm and not more than 36 mm.

Description

Technical Field

[0001] The present invention mainly relates to an air spinning device for spinning yarn using air. Background Art

[0002] Conventionally, there is known an air spinning device that twists fibers using the action of a swirling airflow formed in a spinning chamber to produce a spun yarn. Patent Document 1 discloses such an air spinning device.

[0003] The air spinning device of Patent Document 1 has a structure in which a nozzle cap for fixing a fiber guide and a nozzle block to a nozzle holder is provided to prevent displacement of the mounting positions of the fiber guide and the nozzle block, thereby reducing shape deviation of the spinning chamber.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2012-127009 Summary of the invention

[0007] An object of the present invention is to provide an air spinning device capable of spinning higher quality spun yarn, an air spinning machine including the air spinning device, and a spinning method using the air spinning device.

[0008] According to a first aspect of the present invention, an air spinning device having the following structure is provided. That is, the air spinning device twists a fiber bundle using a swirling air flow to generate yarn. The air spinning device comprises a fiber guide, a nozzle block and an inlet chamber forming block. The fiber guide guides the fiber bundle. A nozzle is formed in the nozzle block for passing compressed air, wherein the compressed air is used to generate a swirling air flow that acts on the fiber bundle guided by the fiber guide. An inlet chamber is formed in the inlet chamber forming block for the swirling air flow to flow into. The inlet chamber has a portion with a diameter of not less than 25 mm and not more than 36 mm.

[0009] This makes it possible to construct an inlet chamber that can easily collect fiber waste. As a result, each fiber included in the fiber bundle can be smoothly swirled by the action of the swirling air flow, so that high-quality yarn can be produced.

[0010] In the above air spinning device, the inflow chamber preferably has a portion having a diameter of 28 mm or more and less than 34 mm.

[0011] This makes it easier to collect fiber waste.

[0012] In the air spinning device, it is preferable that the length of the inflow chamber in the axial direction of the inflow chamber is not less than 38% and not more than 75% of the diameter of the inflow chamber.

[0013] Thereby, an inflow chamber having an appropriate shape can be realized.

[0014] In the above-mentioned air spinning device, preferably, the length of the inlet chamber in the axial direction of the inlet chamber is not less than 14 mm and not more than 25 mm.

[0015] Thereby, an inflow chamber of an appropriate size can be formed.

[0016] In the air spinning device, the inlet chamber is preferably connected to an exhaust passage for exhausting the swirling air flow via a connection opening formed in the inlet chamber forming block.

[0017] Thereby, air can be exhausted from the inlet chamber. Also, fiber waste collected in the inlet chamber can be easily exhausted.

[0018] In the air spinning device, it is preferable to have a configuration in which, in the connection opening, a distance between an end portion located on one side of the inlet chamber in a circumferential direction and an end portion located on the other side in the circumferential direction is smaller than a diameter of the inlet chamber.

[0019] Thus, the air can be discharged to the outside from the inlet chamber with a compact structure.

[0020] In the air spinning device, preferably, the portion of the inflow chamber where the connection opening is not formed has a portion with a diameter of 25 mm to 36 mm.

[0021] Thereby, the size of the inflow chamber can be set within an appropriate range.

[0022] In the above air spinning device, it is preferable that a diameter of the inflow chamber increases as the distance from the fiber guide increases.

[0023] Thereby, the compressed air ejected from the nozzles of the nozzle block can be discharged smoothly.

[0024] The air spinning device is preferably configured such that the maximum value of the diameter of the inflow chamber is not less than 25 mm and not more than 36 mm, and the difference between the maximum value and the minimum value of the diameter of the inflow chamber is not more than 5 mm.

[0025] This makes it possible to realize a structure in which the shape of the inflow chamber does not change suddenly. Therefore, the flow of air in the inflow chamber can be smoothed.

[0026] In the air spinning device, preferably, the volume of the inflow chamber is 3000 mm 3 Above 8000mm 3 the following.

[0027] Thereby, a space suitable for the spinning inlet chamber can be formed.

[0028] The air spinning device preferably further includes a hollow guide shaft for guiding the yarn to the outside.

[0029] Thus, the yarn spun by the swirling air flow can be easily guided toward the outside of the air spinning device.

[0030] In the air spinning device, the hollow guide shaft preferably has a sloped surface that is inclined at an angle of 37 degrees to 70 degrees with respect to an axial direction of the inflow chamber at a portion inserted into the inflow chamber.

[0031] Thus, in a state where the hollow guide shaft body is inserted, a space having a certain size for air to flow can be ensured in the inflow chamber.

[0032] The air spinning device is preferably configured as follows. That is, a swirling air flow generating chamber for generating the swirling air flow is formed in the nozzle block. The swirling air flow generating chamber is formed into a cone whose diameter increases as it moves away from the fiber guide. The outer peripheral surface of the portion of the hollow guide shaft body inserted into the swirling air flow generating chamber is parallel or approximately parallel to the inner wall surface of the swirling air flow generating chamber. Approximately parallel means that the absolute value of the angle difference is within 5°.

[0033] Thus, the swirling space of the fibers forming the yarn can be appropriately formed so that the swirling airflow flows smoothly.

[0034] The air spinning device preferably includes a pressure sensor that detects pressure in the inflow chamber.

[0035] As a result, the pressure in the inflow chamber can be properly detected without being affected by exhaust gas as in the past, or abnormality detection in the inflow chamber is delayed due to the time it takes from the accumulation of foreign matter in the inflow chamber to the pressure change.

[0036] The diameter of the inflow chamber is preferably a diameter of a circle of a cross-section obtained by cutting the inflow chamber.

[0037] According to a second aspect of the present invention, an air spinning machine having the following structure is provided. That is, the air spinning machine comprises the air spinning device and a drafting device. The drafting device drafts the yarn to form a fiber bundle. The nozzle distance is greater than 1.5 times and less than 2.0 times the diameter of the inflow chamber, wherein the nozzle distance is the distance from the portion of the drafting device that delivers the fiber bundle at the most downstream to the upstream end face of the hollow guide shaft body provided in the air spinning device.

[0038] Thus, the stretched fiber bundle can be appropriately introduced into the air spinning device and spun.

[0039] The air spinning machine preferably further includes a tension sensor for detecting the tension of the yarn generated by the air spinning device.

[0040] Thus, even when it is difficult to detect the spinning abnormality with the pressure sensor, information on the yarn tension can be obtained with the tension sensor, thereby appropriately detecting the spinning abnormality.

[0041] According to a third aspect of the present invention, there is provided an air spinning method having the following configuration: That is, in this air spinning method, the shape of the inlet chamber is changed according to the type of the fiber bundle to be spun.

[0042] Thus, by setting the size of the inlet chamber for the swirling air flow to a size suitable for the type of fiber bundle, the pressure in the swirling air flow generating chamber can be made suitable for spinning. Therefore, foreign matter such as fiber scraps contained in the fiber bundle can be easily discharged, thereby improving the quality of the spun yarn. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a front view showing the overall structure of an air spinning machine including the air spinning device according to one embodiment of the present invention.

[0044] Figure 2 It is a side view showing the spinning unit and the yarn joining trolley.

[0045] Figure 3 It is a partial cross-sectional view showing the structure of an air spinning device.

[0046] Figure 4 It is an exploded perspective view showing the structure of a spinning block.

[0047] Figure 5 It is a perspective view showing the structure of a spinning block and a hollow guide shaft body.

[0048] Description of Reference Numerals

[0049] 4 Air spinning device

[0050] 7 Inflow chamber

[0051] 41a Fiber guide

[0052] 41b Nozzle block

[0053] 41c Nozzle Tip

[0054] F Fiber bundle

[0055] Y Spun Yarn (Yarn) DETAILED DESCRIPTION

[0056] Next, refer to Figure 1 and Figure 2 An air spinning machine 1 including an air spinning device 4 according to an embodiment of the present invention will be described.

[0057] Figure 1 The illustrated air spinning machine 1 includes a blower case 11, a motor case 12, a plurality of spinning units 2, and a yarn joining cart 8. The plurality of spinning units 2 are arranged side by side in a predetermined direction.

[0058] A blower 13 and the like that function as a negative pressure source are arranged in the blower case 11 .

[0059] A driving source (not shown), a central control device 14, a display unit 15, and an operation unit 16 are arranged in the prime mover box 12. The driving source provided in the prime mover box 12 includes a motor commonly used by the plurality of spinning units 2.

[0060] The central control device 14 centrally manages and controls various parts of the air spinning machine 1. Figure 2 As shown, the central control device 14 is connected to the unit control unit 20 of each spinning unit 2 via a signal line (not shown). In the present embodiment, each spinning unit 2 has a unit control unit 20, but a predetermined number (e.g., two or four) of spinning units 2 may share one unit control unit 20.

[0061] The display unit 15 can display setting contents for the spinning unit 2 and / or information related to the state of the spinning unit 2. When the display unit 15 is a touch panel display, the display unit 15 and the operation unit 16 may be integrally configured.

[0062] Each spinning unit 2 mainly includes a drafting device 3, an air spinning device 4, a yarn storage device 5, and a winding device 6, which are arranged in order from upstream to downstream. The "upstream" and "downstream" here refer to the upstream and downstream of the yarn S, the fiber bundle F, and the spun yarn Y when winding the spun yarn (yarn) Y in the traveling direction.

[0063] The drafting device 3 is provided near the upper end of a frame 10 provided in the air spinning machine 1. Figure 2 As shown, the drafting device 3 includes four drafting roller pairs. The four drafting roller pairs are arranged in order from upstream to downstream: a back roller pair 31, a third roller pair 32, a middle roller pair 33, and a front roller pair 34. In the middle roller pair 33, a tangent belt 35 is provided for each roller.

[0064] The drafting device 3 sandwiches the sliver S supplied from a sliver can (not shown) between the rollers of each drafting roller pair and conveys it, thereby stretching (drafting) the sliver S to a predetermined fiber amount (or thickness) to generate a fiber bundle F. The fiber bundle F generated by the drafting device 3 is supplied to the air spinning device 4.

[0065] The air spinning device 4 causes a swirling airflow to act on the fiber bundle F generated by the drafting device 3 to twist the fiber bundle F, thereby generating a spun yarn Y. The detailed structure of the air spinning device 4 will be described later.

[0066] The yarn storage device 5 is supplied with the spun yarn Y produced by the air spinning device 4. Figure 2 As shown, the yarn accumulation device 5 includes a yarn accumulation roller 51 and a motor 52.

[0067] The yarn accumulation roller 51 is driven to rotate by the motor 52. The yarn accumulation roller 51 wraps the spun yarn Y around its outer peripheral surface and temporarily accumulates it. The yarn accumulation roller 51 rotates at a predetermined rotation speed with the spun yarn Y wrapped around its outer peripheral surface, thereby drawing the spun yarn Y from the air spinning device 4 at a predetermined speed and conveying it to the downstream side.

[0068] As described above, the yarn accumulation device 5 can temporarily accumulate the spun yarn Y on the outer peripheral surface of the yarn accumulation roller 51, and thus functions as a buffer for the spun yarn Y. Thus, it is possible to eliminate the inconvenience (e.g., slack of the spun yarn Y) caused by the spinning speed and the winding speed (the running speed of the spun yarn Y wound into the package 60 described later) in the air spinning device 4 due to some reasons.

[0069] A yarn monitoring device 50 and a tension sensor 53 are provided between the air spinning device 4 and the yarn accumulation device 5. The spun yarn Y produced by the air spinning device 4 passes through the yarn monitoring device 50 and the tension sensor 53 before being accumulated in the yarn accumulation device 5.

[0070] The yarn monitoring device 50 monitors the quality of the traveling spun yarn Y by means of an optical sensor, and detects yarn defects contained in the spun yarn Y. As yarn defects, for example, abnormal thickness of the spun yarn Y and foreign matter contained in the spun yarn Y can be considered. When the yarn monitoring device 50 detects a yarn defect in the spun yarn Y, it sends a yarn defect detection signal to the unit control unit 20. The yarn monitoring device 50 may monitor the quality of the spun yarn Y by using, for example, an electrostatic capacitance sensor instead of the optical sensor. Instead of or in addition to these examples, the yarn monitoring device 50 may be configured to measure the tension of the spun yarn Y as the quality of the spun yarn Y.

[0071] The tension sensor 53 measures the tension of the traveling spun yarn Y between the air spinning device 4 and the yarn accumulation device 5. The tension sensor 53 transmits the measured tension value to the unit control section 20.

[0072] When the unit control unit 20 receives a yarn defect detection signal from the yarn monitoring device 50 or receives an abnormal tension value from the tension sensor 53, it stops driving the air spinning device 4 and / or the drafting device 3 to cut the spun yarn Y. That is, the air spinning device 4 functions as a cutting unit that cuts the spun yarn Y when the yarn monitoring device 50 detects a yarn defect. In addition, the spinning unit 2 may include a cutter for cutting the spun yarn Y.

[0073] The winding device 6 includes a cradle arm 61, a winding drum 62, and a traverse guide 63. The cradle arm 61 is supported so as to be swingable around a support shaft 64, and can rotatably support a bobbin 65 (i.e., a package 60) for winding the spun yarn Y. The winding drum 62 rotates in contact with the outer peripheral surface of the bobbin 65 or the package 60, thereby rotating and driving the package 60 in the winding direction. The winding device 6 reciprocates the traverse guide 63 by a driving mechanism (not shown) and drives the winding drum 62 by an electric motor (not shown). Thus, the winding device 6 winds the spun yarn Y around the package 60 while traversing the spun yarn Y.

[0074] like Figure 1 As shown, a guide rail 81 is arranged on the frame 10 of the air spinning machine 1 along the direction in which the plurality of spinning units 2 are arranged. The yarn joining carriage 8 is configured to be able to travel on the guide rail 81. Thus, the yarn joining carriage 8 can move relative to the plurality of spinning units 2. The yarn joining carriage 8 travels to the spinning unit 2 where a yarn breakage or yarn cut occurs, and performs a yarn joining operation on the spinning unit 2.

[0075] like Figure 1 As shown, the yarn joining carriage 8 includes a traveling wheel 82, a yarn joining device 83, a suction pipe 84, and a suction nozzle 85. The yarn joining carriage 8 also includes Figure 2 The trolley control unit 80 is shown.

[0076] The suction pipe 84 can catch the spun yarn Y generated by the air spinning device 4 when the yarn is released for spinning. Specifically, the suction pipe 84 can suck in and catch the spun yarn Y sent out from the air spinning device 4 by generating a suction airflow at its front end. The suction nozzle 85 can catch the spun yarn Y wound on the package 60 of the winding device 6. Specifically, the suction nozzle 85 can suck in and catch the spun yarn Y from the package 60 supported by the winding device 6 by generating a suction airflow at its front end. The suction pipe 84 and the suction nozzle 85 rotate in a state where the spun yarn Y is captured, thereby guiding the spun yarn Y to a position where it can be introduced into the yarn joining device 83.

[0077] The yarn joining device 83 joins the spun yarn Y from the air spinning device 4 guided by the suction pipe 84 and the spun yarn Y from the package 60 guided by the suction nozzle 85. In the present embodiment, the yarn joining device 83 is a splicing device that twists the yarn ends together by using a swirling air flow. The yarn joining device 83 is not limited to the above-mentioned splicing device, and for example, a mechanical knotter or the like may be used.

[0078] Carriage control unit 80 (see Figure 2 ) is constituted as a well-known computer having a CPU, ROM, RAM, etc. (not shown). The carriage control unit 80 controls the operation of each part of the yarn splicing carriage 8 to control the yarn splicing operation performed by the yarn splicing carriage 8.

[0079] Next, refer to Figure 3 The structure of the air spinning device 4 will be described in detail.

[0080] like Figure 3 As shown, the air spinning device 4 mainly includes a spinning block 41 and a hollow guide shaft body 42.

[0081] In the spinning block 41, the fiber bundle F supplied from the drafting device 3 is guided into the inside thereof, so that the swirling air flow acts on the fiber bundle F. The generation and stop of the swirling air flow are controlled by the unit control unit 20. Figure 3 and Figure 4 As shown, the spinning block 41 mainly includes a fiber guide 41a, a nozzle block 41b, a nozzle head (inflow chamber forming block) 41c, and a nozzle cap 41d.

[0082] The fiber guide 41a is a member for guiding the drafted fiber bundle F to the swirling air flow generating chamber 40 described later. Figure 4 As shown in FIG. 1 , the fiber guide 41a is formed with a portion for guiding the fiber guide 41a along the traveling direction of the fiber bundle (in Figure 4 The fiber bundle F passes through the guide hole 41e and is introduced into the swirling air flow generating chamber 40.

[0083] The swirling air flow generating chamber 40 is formed inside the nozzle block 41b. Figure 3 As shown in FIG. 1 , the swirling air flow generating chamber 40 is formed into a cone whose diameter increases from upstream to downstream. In the swirling air flow generating chamber 40, compressed air (air) is ejected from a nozzle (not shown) to generate a swirling air flow that acts on the fiber bundle F. Under the action of the swirling air flow, each fiber end of the plurality of fibers constituting the fiber bundle F is reversed and swirled.

[0084] The nozzle block 41b is provided with a plurality of nozzles (not shown) through which the air ejected into the swirling air flow generating chamber 40 passes. The nozzle is configured, for example, as an elongated hole formed in the nozzle block 41b (constituting the wall of the swirling air flow generating chamber 40). Each nozzle is arranged in a manner that the length direction is slightly inclined toward the downstream side of the yarn conveying direction. A plurality of nozzles are arranged around the swirling air flow generating chamber 40 at equal angles. Compressed air supplied from a compressed air source (not shown) is ejected into the swirling air flow generating chamber 40 via each nozzle. The air ejected from the nozzle flows toward the downstream side while swirling around the hollow guide shaft body 42 to be described later that is inserted into the swirling air flow generating chamber 40. In this way, a swirling air flow that is counterclockwise when viewed in the direction from the upstream toward the downstream is generated in the swirling air flow generating chamber 40. The swirling air flow flows in a spiral shape toward the downstream (inflow chamber 7).

[0085] The nozzle head 41c and the nozzle cap 41d hold the fiber guide 41a and the nozzle block 41b. The nozzle head 41c and the nozzle cap 41d function as a housing that accommodates a part of the fiber guide 41a and the nozzle block 41b.

[0086] The nozzle head 41c is formed into a block shape having a fixed thickness. Figure 4 As shown, when viewed in the thickness direction, the nozzle head 41c has a shape in which a semicircle whose diameter is the length of the side is connected to one side of a rectangle. In addition, in the following description, there is a case where the direction in which the rectangle and the semicircle are arranged is referred to as the length direction of the nozzle head 41c. The nozzle head 41c is formed with an inlet chamber 7 and an air exhaust passage (exhaust passage) 70.

[0087] The inflow chamber 7 is formed in a substantially cylindrical shape on one side in the longitudinal direction of the nozzle head 41c. The central axis of the inflow chamber 7 is arranged so as to coincide with the center of the semicircle of the nozzle head 41c. The inflow chamber 7 is connected to the swirling air flow generating chamber 40. Most of the inflow chamber 7 is located on the side farther from the swirling air flow generating chamber 40 when viewed from the fiber guide 41a.

[0088] The details will be described later, and a hollow guide shaft body 42 described later is inserted into the center of the inflow chamber 7. An annular gap is formed between the inner wall of the inflow chamber 7 and the hollow guide shaft body 42. The annular portion of the internal space of the inflow chamber 7 where the hollow guide shaft body 42 is not arranged substantially functions as a passage for air.

[0089] When the inflow chamber 7 is cut perpendicularly to the running direction of the spun yarn Y, the cross section has a circular shape. The running direction of the spun yarn Y can also be referred to as the axial direction of the inflow chamber 7. In the present embodiment, the diameter of the outer circumference of the inflow chamber 7 is formed so as to gradually increase as it moves away from the fiber guide 41a. Therefore, as the position where the inflow chamber 7 is cut tends to the downstream side, the diameter of the circle of the cross section (equivalent to the diameter of the outer circumference of the inflow chamber 7) gradually increases.

[0090] exist Figure 5 In the figure, the maximum diameter D1, which is the diameter at the largest part of the outer periphery of the inflow chamber 7 (in other words, the part farthest from the swirling air flow generating chamber 40), and the minimum diameter D2 at the smallest part of the inflow chamber 7 are indicated by white arrows. In the present embodiment, the maximum diameter D1 and the minimum diameter D2 are both greater than 28 mm and less than 34 mm. However, the present invention is not limited to this range. The maximum diameter D1 can be set within a range of greater than 25 mm and less than 36 mm depending on the type of the fiber bundle F to be spun.

[0091] As described above, in this embodiment, the diameters of the inflow chambers 7 are not uniform. Hereinafter, the average diameter of the inflow chambers 7 may be simply referred to as the diameter D of the inflow chambers 7. Figure 3 The diameter D of the inflow chamber 7 can be set to, for example, the arithmetic mean of the maximum diameter D1 and the minimum diameter D2. The diameter D of the inflow chamber 7 is larger than the minimum diameter D2 and smaller than the maximum diameter D1.

[0092] The details will be described later. The outer periphery of the inflow chamber 7 has a portion connected to the air exhaust passage 70 via the connection opening 71. When the inflow chamber 7 is cut in a manner including this portion, the cross section is not circular. However, since the cross section has an arc-shaped portion, it is sufficient to consider the diameter of the arc. Alternatively, when the inflow chamber 7 is cut in the same manner as above at a location where the connection opening 71 is not formed, it is sufficient as long as the inflow chamber 7 has a portion in which the diameter of the circle of the cross section is within the range of 25 mm to 36 mm.

[0093] The axial direction of the inlet chamber 7 is the direction connecting the front side and the back side when viewed in the direction in which the fiber bundle F or the spun yarn Y passes through the air spinning device 4. Considering this, the axial length of the inlet chamber 7 is referred to as the depth. Figure 3 and Figure 5Shown by the reference numeral L1 in the figure. The outer periphery of the axial end of the inflow chamber 7 can be set to an arc-rounded shape as Figure 3 shown. In this case, the depth L1 refers to the depth of the portion excluding the rounded portion. A chamfered shape can also be used instead of the arc-rounded shape. In this case, the depth L1 refers to the depth of the portion excluding the chamfered portion. In the present embodiment, the depth L1 is 38% or more and 75% or less of the diameter D of the inflow chamber 7.

[0094] The size of the depth L1 of the inflow chamber 7 is set according to the diameter D of the inflow chamber 7 and the inclination angle of the tapered surface 43 of the shaft body seat 42b described later. In the present embodiment, the depth L1 of the inflow chamber 7 is 14 mm or more and 25 mm or less. Thereby, a sufficient volume of the inflow chamber 7 can be ensured.

[0095] In the inflow chamber 7 of the present embodiment, the difference between the diameter (the above-mentioned maximum diameter D1) of the portion with the largest outer periphery and the diameter of the portion with the smallest outer periphery, i.e., the minimum diameter D2, is within 5 mm. In the present embodiment, the difference between the maximum diameter D1 and the minimum diameter D2 is 3 mm.

[0096] The inflow chamber 7 formed as described above has a volume of 3000 mm 3 or more and 8000 mm 3 or less. Here, the volume of the inflow chamber 7 refers to the volume of the substantially cylindrical internal space of the inflow chamber 7 excluding the portion where the swirling air flow does not flow in (specifically, the portion where the hollow guide shaft body 42 and the like are inserted). In the nozzle head 41c, the inflow chamber 7 is connected to the air discharge passage 70, but the volume described here does not include the volume of the air discharge passage 70.

[0097] The inflow chamber 7 is formed to be open on the side opposite to the hollow guide shaft body 42 described later. In other words, in the inflow chamber 7, the side opposite to the side where the nozzle block 41b is inserted is open. The hollow guide shaft body 42 can be inserted into the inside of the inflow chamber 7 from this open side.

[0098] In the inflow chamber 7, a connection opening 71 that opens toward the air discharge passage 70 is formed. The inflow chamber 7 is connected to the air discharge passage 70 via the connection opening 71. The air in the inflow chamber 7 is discharged to the outside via the air discharge passage 70.

[0099] The air exhaust passage 70 is elongated and formed in a straight line. The length direction of the air exhaust passage 70 is parallel to the length direction of the nozzle head 41c and perpendicular to the traveling direction of the spun yarn Y (the axial center of the hollow guide shaft body 42). The cross section of the air exhaust passage 70 cut perpendicularly to the length direction has a rectangular shape. The air exhaust passage 70 is formed in a manner that opens to the side opposite to the side where the inflow chamber 7 is formed in the length direction of the nozzle head 41c. That is, the air exhaust passage 70 connects the inflow chamber 7 and the outside of the air spinning device 4. Specifically, the outside of the air spinning device 4 refers to a negative pressure source composed of a blower 13 or the like that performs suction with a weak force. The air exhaust passage 70 is connected to the blower 13 via, for example, a duct not shown in the figure that is arranged along the arrangement direction of the spinning units 2.

[0100] The inflow chamber 7 is located on the downstream side of the swirling air flow generation chamber 40 in the flow direction of the swirling air flow. In addition, the inflow chamber 7 has a relatively larger space than the swirling air flow generation chamber 40. Therefore, the pressure in the inflow chamber 7 is lower than the pressure in the swirling air flow generation chamber 40. How much the pressure in the inflow chamber 7 is lower than the pressure in the swirling air flow generation chamber 40 is greatly affected by the size of the inflow chamber 7.

[0101] In this regard, in the present embodiment, the pressure in the inflow chamber 7 can be appropriately maintained by forming the inflow chamber 7 in a size corresponding to the type of the fiber bundle F. For example, it is conceivable to prepare a plurality of spinning blocks 41 having different maximum diameters D1, minimum diameters D2, depths L1, etc., and replace the spinning blocks 41 according to the fiber bundle F to be used. Thus, the air flow in the swirling air flow generating chamber 40 can flow to the inflow chamber 7 at an appropriate speed, and fiber scraps falling from the fiber bundle F can be easily introduced into the inflow chamber 7 by riding on the air flow.

[0102] The fiber waste in the inflow chamber 7 is not retained in the inflow chamber 7 by the suction force generated by the negative pressure source, and is easily discharged from the air spinning device 4 through the air discharge passage 70. As a result, in the swirling air flow generating chamber 40, the fiber waste does not remain in the fiber bundle F for generating the spun yarn Y, and the fiber waste is smoothly discharged, so that a high-quality spun yarn Y can be generated. As the fiber waste and the like are not easily retained in the inflow chamber 7, foreign matter such as the fiber waste is not easily contacted with the fibers rotating while being reversed in the swirling air flow generating chamber 40. Therefore, the tension of the fiber bundle F can be stabilized.

[0103] The connection opening 71 is as Figure 5As shown in the figure, it is formed into a substantially rectangular shape (rectangular shape with rounded corners). In the connection opening 71, the distance L2 between the end located on one circumferential side of the inflow chamber 7 and the end located on the other circumferential side is smaller than the maximum diameter D1. As a result, the air flow can be smoothly discharged from the inflow chamber 7 with a compact structure.

[0104] An insertion hole 41f for inserting a part of the nozzle block 41b is formed on the side of the surface of the nozzle head 41c that faces the nozzle cap 41d. A part of the nozzle block 41b is inserted into the inflow chamber 7 through the insertion hole 41f.

[0105] When assembling the spinning block 41, Figure 4 As shown in the figure, a part of the nozzle block 41b is inserted into the inflow chamber 7 through the insertion hole 41f. Thus, the swirling air flow generation chamber 40 formed in the nozzle block 41b and the inflow chamber 7 formed in the nozzle head 41c are connected. Therefore, the swirling air flow formed in the swirling air flow generation chamber 40 can flow into the inflow chamber 7.

[0106] In the spinning unit 2 of this embodiment, as Figure 3 As shown, a pressure sensor 9 for detecting the pressure in the inflow chamber 7 is provided. The pressure sensor 9 detects the pressure in the inflow chamber 7, for example, via a tube (not shown) inserted into a pressure detection hole penetrating the wall of the inflow chamber 7. The pressure sensor 9 is electrically connected to the unit control unit 20. The pressure sensor 9 sends a signal indicating the detected pressure to the unit control unit 20. The unit control unit 20 determines whether an abnormality such as blockage of the inflow chamber 7 has occurred based on the pressure acquired from the pressure sensor 9.

[0107] In the air spinning device 4 of the present embodiment, as described above, the maximum diameter D1 of the inflow chamber 7 is 25 mm or more, preferably 28 mm or more, and the inflow chamber 7 is formed to be relatively large. Therefore, the pressure detection hole for detecting the pressure in the inflow chamber 7 can be provided at a position away from the connection opening 71. As a result, the pressure detection is less likely to be affected by the exhaust gas, and thus the pressure change in the inflow chamber 7 can be detected with high accuracy.

[0108] However, in the present embodiment, the maximum diameter D1 is 36 mm or less, preferably less than 34 mm, and the inflow chamber 7 is not too large. Therefore, when foreign matter such as fiber scraps accumulates in the inflow chamber 7, pressure changes are likely to occur in the inflow chamber 7. Therefore, before foreign matter such as fiber scraps accumulates in large quantities in the inflow chamber 7, foreign matter such as fiber scraps can be discharged by appropriate actions (such as automatic cleaning actions) based on pressure detection. As a result, foreign matter such as fiber scraps can be prevented from adhering to the spun yarn Y.

[0109] The nozzle cap 41d is disposed on the nozzle head 41c. The nozzle cap 41d is detachably mounted on the nozzle head 41c by means of bolts or the like. Figure 4 As shown, the nozzle cap 41d is formed in a plate shape having a circular cross-sectional shape when cut perpendicularly to the traveling direction of the fiber bundle F. A through hole through which a part of the fiber guide 41a can pass is formed at the center of the nozzle cap 41d.

[0110] When forming the spinning block 41, as Figure 3 or Figure 5 As shown, the fiber guide 41a passes through the nozzle cap 41d from the downstream side of the nozzle cap 41d (the downstream side in the yarn travel direction during spinning) through the above-mentioned through hole, and the head of the fiber guide 41a (the upstream end) is exposed from the nozzle cap 41d to the upper side (the upstream side in the yarn travel direction, the side of the drafting device 3).

[0111] By attaching the nozzle cap 41d to the nozzle head 41c, the fiber guide 41a and the nozzle block 41b are sandwiched between the nozzle head 41c and the nozzle cap 41d, and their positions are fixed.

[0112] The hollow guide shaft body 42 is provided on the downstream side of the spinning block 41. The hollow guide shaft body 42 is provided in a manner that can be switched between a contact position in contact with the spinning block 41 and a separation position in which the hollow guide shaft body 42 is separated from the spinning block 41. The position switching of the hollow guide shaft body 42 is realized by a moving mechanism not shown in the figure. When the hollow guide shaft body 42 is in the contact position, the open side of the inflow chamber 7 is closed by the hollow guide shaft body 42 to form a closed inflow chamber 7. When the hollow guide shaft body 42 is in the separation position, the inflow chamber 7 is open to the outside. In the state where the inflow chamber 7 is closed, the fiber scraps inside the inflow chamber 7 can be removed by omitting the suction device not shown in the figure (for example, the above-mentioned negative pressure source). In the state where the inflow chamber 7 is open, the fiber scraps remaining in the swirling air flow generating chamber 40 and the front end of the hollow guide shaft body 42 can be removed, for example, by spraying air from the nozzle of the nozzle block 41b.

[0113] The hollow guide shaft body 42 is fixed to a hollow guide shaft body holding portion (not shown). A guide shaft body block is formed by the hollow guide shaft body holding portion and the hollow guide shaft body 42. The hollow guide shaft body 42 includes a shaft main body 42a and a shaft body seat 42b.

[0114] A cylindrical yarn passage is formed inside the shaft body 42a. The yarn passage guides the fiber bundle F spun in the swirling air flow generating chamber 40 to the outside as a spun yarn Y. A swirling air flow flowing from upstream to downstream may be generated in the yarn passage by spraying air from a nozzle (not shown). When viewed from upstream to downstream, the direction of the swirling air flow generated in the yarn passage is opposite to the direction of the swirling air flow in the swirling air flow generating chamber 40. Figure 3 In the embodiment, the front end (inlet of the yarn passage) of the shaft body 42a constituting a part of the swirling air flow generating chamber 40 and the yarn passage are integrally formed. The nozzle not shown in the figure may be formed in a tubular member different from the shaft body 42a, and the tubular member may be arranged inside the shaft body 42a. The yarn passage may also be formed by a plurality of members.

[0115] The upstream portion of the shaft body 42a is formed in a conical shape. The conical upstream portion of the shaft body 42a is formed slightly smaller than the tapered space of the swirl air flow generation chamber 40. The upstream portion is inserted into the interior of the swirl air flow generation chamber 40.

[0116] like Figure 3 As shown, the outer peripheral surface of the upstream portion of the shaft body 42a inserted in the swirling air flow generating chamber 40 is formed approximately parallel to the wall surface of the inner wall of the swirling air flow generating chamber 40 in the nozzle block 41b. That is, the distance between the outer wall surface of the upstream portion of the shaft body 42a inserted in the swirling air flow generating chamber 40 and the inner wall surface of the swirling air flow generating chamber 40 facing the outer wall surface is approximately fixed. As a result, it is possible to avoid a sharp change in the flow difficulty of the air in the flow path of the swirling air flow. Therefore, in the swirling air flow generating chamber 40, it is possible to prevent a sharp change in the air flow speed, thereby stably spinning. However, the shape of the upstream portion of the shaft body 42a and / or the shape of the inner wall surface of the swirling air flow generating chamber 40 may also be other shapes. The above distance may not be fixed, for example, the distance on the upstream side may be larger than the distance on the downstream side or the distance on the upstream side may be smaller than the distance on the downstream side.

[0117] When the spinning block 41 is in contact with the hollow guide shaft 42, the upstream side portion of the shaft body 42a passes through the inlet chamber 7 and protrudes into the swirling air flow generating chamber 40. Thus, a conical cylindrical space is formed between the shaft body 42a and the swirling air flow generating chamber 40. In this space, the fibers included in the fiber bundle F swirl due to the action of the swirling air flow.

[0118] The shaft seat 42b is used to hold the shaft body 42a. The shaft seat 42b is formed into a tapered shape whose outer diameter gradually increases from upstream to downstream. A holding hole is formed through which the shaft seat 42b passes. The direction of the holding hole is parallel to the traveling direction of the spun yarn Y (the axial direction of the yarn path). The shaft seat 42b holds the shaft body 42a in a state where the downstream portion of the shaft body 42a is inserted into the holding hole.

[0119] The upstream side portion of the shaft body seat 42b is formed into a conical shape whose diameter increases as it moves away from the nozzle block 41b. In the following description, the conical outer peripheral surface formed in the upstream side portion of the shaft body seat 42b is sometimes referred to as a conical surface (inclined surface) 43. The inclination angle (inner angle) θ of the conical surface 43 relative to the axis of the hollow guide shaft body 42 is not less than 37 degrees and not more than 70 degrees. Thus, a sufficient space for the flow and discharge of air can be formed between the hollow guide shaft body 42 and the wall of the inflow chamber 7. Therefore, the fiber scraps can be discharged smoothly along with the air flow.

[0120] like Figure 3 As shown, the air spinning device 4 of the present embodiment is disposed on the downstream side compared to the drafting device 3. Specifically, the air spinning device 4 is disposed on the downstream side compared to the drafting device 3 in such a manner that the nozzle distance L3 is greater than 1.5 times and less than 2.0 times the diameter D of the inflow chamber 7, wherein the nozzle distance L3 is the distance between the position where the fiber bundle F is discharged from the front roller pair 34 of the drafting device 3 (based on the clamping point of the front roller pair 34) and the upstream end surface (front end) of the hollow guide shaft body 42 of the air spinning device 4. As a result, the fiber bundle F is appropriately stretched and introduced into the air spinning device 4 in a stable state, so that a spun yarn Y of good quality can be produced.

[0121] As described above, the air spinning device 4 of the present embodiment twists the fiber bundle F using the swirling air flow to generate the spun yarn Y. The air spinning device 4 includes a fiber guide 41a, a nozzle block 41b, and a nozzle head 41c. The fiber guide 41a guides the fiber bundle F. The nozzle block 41b is provided with a nozzle through which compressed air passes, wherein the compressed air is used to generate the swirling air flow that acts on the fiber bundle F guided by the fiber guide 41a. The nozzle head 41c is provided with an inflow chamber 7 into which the swirling air flow flows. The inflow chamber 7 has a portion with a diameter of 25 mm or more and 36 mm or less.

[0122] This makes it possible to configure the inlet chamber 7 that can easily collect fiber waste. As a result, each fiber included in the fiber bundle F can be smoothly swirled by the action of the swirling airflow, and a high-quality spun yarn Y can be produced.

[0123] In the air spinning device 4 of the present embodiment, the inlet chamber 7 has a portion having a diameter of not less than 28 mm and less than 34 mm.

[0124] This makes it easier to collect fiber waste.

[0125] In the air spinning device 4 of the present embodiment, the length of the inflow chamber 7 in the axial direction of the inflow chamber 7 (the depth L1 described above) is not less than 38% and not more than 75% of the diameter D of the inflow chamber 7 .

[0126] Thereby, the inflow chamber 7 suitable for the shape of the hollow guide shaft body 42 can be formed.

[0127] In the air spinning device 4 of the present embodiment, the length of the inlet chamber 7 in the axial direction of the inlet chamber 7 (the depth L1 described above) is not less than 14 mm and not more than 25 mm.

[0128] Thereby, the inflow chamber 7 of an appropriate size can be formed.

[0129] In the air spinning device 4 of the present embodiment, the nozzle head 41c is formed with a connection opening 71. The inlet chamber 7 is connected to an air discharge passage 70 through the connection opening 71 for discharging a swirling air flow.

[0130] Thereby, air can be exhausted from the inflow chamber 7. In addition, fiber waste collected in the inflow chamber 7 can be easily exhausted.

[0131] In the air spinning device 4 of the present embodiment, in the connection opening 71, a distance L2 between an end portion located on one circumferential side of the inlet chamber 7 and an end portion located on the other circumferential side is smaller than a diameter D of the inlet chamber 7.

[0132] Thus, the air can be discharged to the outside from the inflow chamber 7 with a compact structure.

[0133] In the air spinning device 4 of the present embodiment, the portion of the inflow chamber 7 where the connection opening 71 is not formed has a portion with a diameter of 25 mm to 36 mm.

[0134] Thereby, the size of the inflow chamber 7 can be set within an appropriate range.

[0135] In the air spinning device 4 of the present embodiment, the diameter of the inflow chamber 7 increases as the distance from the fiber guide 41a increases.

[0136] Thereby, the compressed air ejected from the nozzles of the nozzle block 41 b can be discharged smoothly.

[0137] In the air spinning device 4 of the present embodiment, the maximum diameter D1 of the inflow chamber 7 is 25 mm to 36 mm. The difference between the maximum diameter D1 and the minimum diameter D2 of the inflow chamber 7 is 5 mm or less.

[0138] This makes it possible to realize a structure in which the shape of the inflow chamber 7 does not change suddenly. Therefore, the flow of air in the inflow chamber 7 can be made smooth.

[0139] In the air spinning device 4 of the present embodiment, the volume of the inflow chamber 7 is 3000 mm 3 Above 8000mm 3 the following.

[0140] Thereby, a space of the inflow chamber 7 suitable for spinning can be formed.

[0141] The air spinning device 4 of the present embodiment further includes a hollow guide shaft body 42 for leading the spun yarn Y to the outside.

[0142] Thus, the spun yarn Y spun by the swirling air flow can be easily guided toward the outside of the air spinning device 4.

[0143] In the air spinning device 4 of the present embodiment, the hollow guide shaft body 42 has a tapered surface 43 inclined at an angle of 37 degrees to 70 degrees with respect to the axial direction of the inflow chamber 7 at a portion inserted into the inflow chamber 7.

[0144] Thus, in a state where the hollow guide shaft body 42 is inserted, a space having a certain size for air to flow can be ensured in the inflow chamber 7 .

[0145] The nozzle block 41b of the air spinning device 4 of the present embodiment is provided with a swirling air flow generating chamber 40 for generating a swirling air flow. The swirling air flow generating chamber 40 is formed in a tapered shape whose diameter increases as it moves away from the fiber guide 41a. The outer peripheral surface of the portion of the hollow guide shaft 42 inserted into the swirling air flow generating chamber 40 is parallel or substantially parallel to the inner wall surface of the swirling air flow generating chamber 40.

[0146] Thus, the swirling space of the fibers forming the spun yarn Y can be appropriately formed so that the swirling airflow flows smoothly.

[0147] The air spinning device 4 of the present embodiment includes a pressure sensor 9 which detects the pressure in the inlet chamber 7.

[0148] As a result, the pressure in the inflow chamber 7 can be properly detected by the pressure sensor 9, instead of being affected by the exhaust gas as in the past and being unable to properly detect the pressure in the inflow chamber 7, or the abnormality detection in the inflow chamber 7 being delayed due to the time it takes from the accumulation of foreign matter in the inflow chamber 7 to the pressure change.

[0149] The diameter of the inflow chamber 7 can be considered as the diameter of a circle of a cross-section obtained by cutting the inflow chamber 7 (at a plane perpendicular to the axial direction of the inflow chamber 7 ).

[0150] As described above, the air spinning machine 1 of the present embodiment includes the air spinning device 4 and the drafting device 3. The drafting device 3 drafts the yarn to form a fiber bundle F. The nozzle distance L3 is greater than 1.5 times and less than 2.0 times the diameter D of the inflow chamber 7, and is the distance from the portion (the holding portion based on the front roller pair 34) where the fiber bundle F is sent out at the most downstream in the drafting device 3 to the upstream end surface of the hollow guide shaft body 42.

[0151] Thus, the stretched fiber bundle F can be appropriately introduced into the air spinning device 4 and spun.

[0152] The air spinning machine 1 of the present embodiment further includes a tension sensor 53 that detects the tension of the spun yarn Y produced by the air spinning device 4.

[0153] Thus, even when it is difficult to detect a spinning abnormality using the pressure sensor 9, by acquiring information on the tension of the spun yarn Y using the tension sensor 53, the spinning abnormality can be appropriately detected.

[0154] As mentioned above, although the preferred embodiment of this invention was described, the said structure can be changed as follows, for example.

[0155] A pair of lead-in rollers may be provided between the air spinning device 4 and the yarn accumulation device 5, and the lead-in rollers may be used to lead the spun yarn Y from the air spinning device 4. In this case, at least one of the yarn accumulation device 5, a slack tube utilizing suction air flow, and a mechanical compensator may be provided downstream of the lead-in roller pair.

[0156] The yarn joining cart 8 may replace the splicing device and make the spun yarn Y continuous by a knotting device, a splicer, etc. Alternatively, the yarn joining cart 8 may be omitted and each spinning unit 2 may be equipped with a device necessary for yarn joining.

[0157] In the spinning unit 2, the respective devices may be arranged in the height direction so that the spun yarn Y supplied from the lower side is wound on the upper side.

[0158] exist Figure 3 In the figure, the fiber guide 41a is provided with a needle-shaped member, but the air spinning device 4 may not include a needle-shaped member. The fiber guide 41a and the nozzle block 41b may not be separate components but may be constituted by one component.

[0159] In the above embodiment, the spinning unit 2 includes both the pressure sensor 9 and the tension sensor 53. However, the spinning unit 2 may be configured to include only one of the pressure sensor 9 and the tension sensor 53.

[0160] In the above embodiment, specific devices of the spinning units 2 are driven simultaneously in the plurality of spinning units 2 by the driving source provided in the prime mover case 12. Each spinning unit 2 may be configured so that part or all of these specific devices are driven independently in each spinning unit 2.

Claims

1. An air spinning device for twisting a fiber bundle using a swirling air flow to generate a yarn, the air spinning device comprising: a fiber guide member for guiding the fiber bundle; a nozzle block formed with nozzles for passing compressed air, wherein the compressed air is used to generate a swirling air flow acting on the fiber bundle guided by the fiber guide; and an inflow chamber forming block, wherein the inflow chamber forming block is formed with an inflow chamber into which the swirling air flow flows, The inflow chamber has a portion with a diameter of 25 mm or more and 36 mm or less, The inlet chamber is connected to an exhaust passage for exhausting the swirling air flow via a connection opening formed in the inlet chamber forming block. In the connection opening, a distance between an end portion located on one side of the inflow chamber in a circumferential direction and an end portion located on the other side in the circumferential direction is smaller than a diameter of the inflow chamber.

2. The air spinning device according to claim 1, It is characterized in that The inflow chamber has a portion having a diameter of 28 mm or more and less than 34 mm.

3. The air spinning device according to claim 1, It is characterized in that The length of the inflow chamber in the axial direction of the inflow chamber is not less than 38% and not more than 75% of the diameter of the inflow chamber.

4. The air spinning device according to claim 2, It is characterized in that The length of the inflow chamber in the axial direction of the inflow chamber is not less than 38% and not more than 75% of the diameter of the inflow chamber.

5. The air spinning device according to claim 3, It is characterized in that The length of the inflow chamber in the axial direction of the inflow chamber is not less than 14 mm and not more than 25 mm.

6. The air spinning device according to claim 4, It is characterized in that The length of the inflow chamber in the axial direction of the inflow chamber is not less than 14 mm and not more than 25 mm.

7. The air spinning device according to claim 1, It is characterized in that The portion of the inflow chamber where the connection opening is not formed has a portion with a diameter of 25 mm to 36 mm.

8. The air spinning device according to claim 1, It is characterized in that The diameter of the inflow chamber increases as one moves away from the fiber guide.

9. The air spinning device according to claim 2, It is characterized in that The diameter of the inflow chamber increases as one moves away from the fiber guide.

10. The air spinning device according to claim 3, It is characterized in that The diameter of the inflow chamber increases as one moves away from the fiber guide.

11. The air spinning device according to claim 4, It is characterized in that The diameter of the inflow chamber increases as one moves away from the fiber guide.

12. The air spinning device according to claim 5, It is characterized in that The diameter of the inflow chamber increases as one moves away from the fiber guide.

13. The air spinning device according to claim 6, It is characterized in that The diameter of the inflow chamber increases as one moves away from the fiber guide.

14. The air spinning device according to claim 7, It is characterized in that The diameter of the inflow chamber increases as one moves away from the fiber guide.

15. The air spinning device according to claim 8, It is characterized in that The maximum diameter of the inflow chamber is 25 mm or more and 36 mm or less. The difference between the maximum value and the minimum value of the diameter of the inflow chamber is 5 mm or less.

16. The air spinning device according to claim 9, It is characterized in that The maximum diameter of the inflow chamber is 25 mm or more and 36 mm or less. The difference between the maximum value and the minimum value of the diameter of the inflow chamber is 5 mm or less.

17. The air spinning device according to claim 10, It is characterized in that The maximum diameter of the inflow chamber is 25 mm or more and 36 mm or less. The difference between the maximum value and the minimum value of the diameter of the inflow chamber is 5 mm or less.

18. The air spinning device according to claim 11, It is characterized in that The maximum diameter of the inflow chamber is 25 mm or more and 36 mm or less. The difference between the maximum value and the minimum value of the diameter of the inflow chamber is 5 mm or less.

19. The air spinning device according to claim 12, It is characterized in that The maximum diameter of the inflow chamber is 25 mm or more and 36 mm or less. The difference between the maximum value and the minimum value of the diameter of the inflow chamber is 5 mm or less.

20. The air spinning device according to claim 13, It is characterized in that The maximum diameter of the inflow chamber is 25 mm or more and 36 mm or less. The difference between the maximum value and the minimum value of the diameter of the inflow chamber is 5 mm or less.

21. The air spinning device according to claim 14, It is characterized in that The maximum diameter of the inflow chamber is 25 mm or more and 36 mm or less. The difference between the maximum value and the minimum value of the diameter of the inflow chamber is 5 mm or less.

22. The air spinning device according to any one of claims 1 to 21, It is characterized in that The volume of the inflow chamber is 3000mm 3 Above 8000mm 3 the following.

23. The air spinning device according to any one of claims 1 to 21, It is characterized in that It also has a hollow guide shaft for guiding the yarn to the outside.

24. The air spinning device according to claim 22, It is characterized in that It also has a hollow guide shaft for guiding the yarn to the outside.

25. The air spinning device according to claim 23, It is characterized in that The hollow guide shaft body has a sloped surface that is inclined at an angle of not less than 37 degrees and not more than 70 degrees with respect to the axial direction of the inflow chamber at a portion inserted into the inflow chamber.

26. The air spinning device according to claim 24, It is characterized in that The hollow guide shaft body has a sloped surface that is inclined at an angle of not less than 37 degrees and not more than 70 degrees with respect to the axial direction of the inflow chamber at a portion inserted into the inflow chamber.

27. The air spinning device according to claim 23, It is characterized in that A swirling air flow generating chamber for generating the swirling air flow is formed in the nozzle block. The swirling airflow generating chamber is formed in a tapered shape whose diameter increases as it moves away from the fiber guide. The outer peripheral surface of the portion of the hollow guide shaft body inserted into the swirling air flow generating chamber is parallel or substantially parallel to the inner wall surface of the swirling air flow generating chamber.

28. The air spinning device according to claim 24, It is characterized in that A swirling air flow generating chamber for generating the swirling air flow is formed in the nozzle block. The swirling airflow generating chamber is formed in a tapered shape whose diameter increases as it moves away from the fiber guide. The outer peripheral surface of the portion of the hollow guide shaft body inserted into the swirling air flow generating chamber is parallel or substantially parallel to the inner wall surface of the swirling air flow generating chamber.

29. The air spinning device according to claim 25, It is characterized in that A swirling air flow generating chamber for generating the swirling air flow is formed in the nozzle block. The swirling airflow generating chamber is formed in a tapered shape whose diameter increases as it moves away from the fiber guide. The outer peripheral surface of the portion of the hollow guide shaft body inserted into the swirling air flow generating chamber is parallel or substantially parallel to the inner wall surface of the swirling air flow generating chamber.

30. The air spinning device according to claim 26, It is characterized in that A swirling air flow generating chamber for generating the swirling air flow is formed in the nozzle block. The swirling airflow generating chamber is formed in a tapered shape whose diameter increases as it moves away from the fiber guide. The outer peripheral surface of the portion of the hollow guide shaft body inserted into the swirling air flow generating chamber is parallel or substantially parallel to the inner wall surface of the swirling air flow generating chamber.

31. The air spinning device according to any one of claims 1 to 21, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

32. The air spinning device according to claim 22, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

33. The air spinning device according to claim 23, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

34. The air spinning device according to claim 24, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

35. The air spinning device according to claim 25, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

36. The air spinning device according to claim 26, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

37. The air spinning device according to claim 27, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

38. The air spinning device according to claim 28, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

39. The air spinning device according to claim 29, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

40. The air spinning device according to claim 30, It is characterized in that A pressure sensor is provided to detect the pressure in the inflow chamber.

41. The air spinning device according to any one of claims 1 to 21, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

42. The air spinning device according to claim 22, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

43. The air spinning device according to claim 23, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

44. The air spinning device according to claim 24, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

45. The air spinning device according to claim 25, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

46. ​​The air spinning device according to claim 26, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

47. The air spinning device according to claim 27, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

48. The air spinning device according to claim 28, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

49. The air spinning device according to claim 29, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

50. The air spinning device according to claim 30, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

51. The air spinning device according to claim 31, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

52. The air spinning device according to claim 32, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

53. The air spinning device according to claim 33, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

54. The air spinning device according to claim 34, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

55. The air spinning device according to claim 35, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

56. The air spinning device according to claim 36, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

57. The air spinning device according to claim 37, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

58. The air spinning device according to claim 38, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

59. The air spinning device according to claim 39, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

60. The air spinning device according to claim 40, It is characterized in that The diameter of the inflow chamber is the diameter of a circle of a cross-section obtained by cutting the inflow chamber.

61. An air spinning machine, It is characterized in that have: The air spinning device according to any one of claims 1 to 60; and A drafting device that drafts the yarn to form a fiber bundle. The nozzle distance is greater than 1.5 times and less than 2.0 times the diameter of the inlet chamber, wherein the nozzle distance is the distance from the portion of the drafting device that delivers the fiber bundle at the most downstream to the upstream end surface of the hollow guide shaft body provided in the air spinning device.

62. The air spinning machine according to claim 61, It is characterized in that The invention further includes a tension sensor for detecting the tension of the yarn produced by the air spinning device.

63. An air spinning method, using the air spinning device according to any one of claims 1 to 60 for spinning, wherein the air spinning method is characterized in that: The shape of the inflow chamber is changed according to the type of fiber bundle to be spun.

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