Spinning machine

Abstract

To provide a spinning machine capable of reducing a range affected by an additive at a place where air containing the additive flows in.SOLUTION: The spinning machine 1 includes a plurality of spinning units 7, a first spinning pipe 76, a plurality of first unit pipes 78, an adding section 90, and a connecting section 100. The spinning unit 7 produces and winds a yarn. The compressed air flowing toward the spinning unit 7 flows through the first spinning pipe 76. The first unit pipe 78 is branched from the first spinning pipe 76, and connects the first spinning pipe 76 and the spinning unit 7. The addition unit 90 supplies an additive to air to generate added air containing the additive. The connecting section 100 connects the first spinning pipe 76 and the adding section 90, a sending-out hole 103a for sending out the added air is formed, and the sending-out hole 103a faces the downstream side of the first spinning pipe 76.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates primarily to a spinning machine that supplies air containing an additive to a spinning unit. [Background technology]

[0002] The spinning machine of Patent Document 1 includes a first spinning pipe, a first unit pipe, and a delivery pipe. The first spinning pipe supplies compressed air to the spinning units. The first unit pipe supplies compressed air from the first spinning pipe to each individual spinning unit. The delivery pipe supplies air containing an additive to the first spinning pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-143382 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 does not disclose in detail the connection structure between the first spinning pipe and the delivery pipe. Therefore, there is a possibility that air containing additives may flow from the connection point between the first spinning pipe and the delivery pipe to the upstream side of the first spinning pipe. In this case, the additives may deteriorate the pipes. Therefore, if measures to prevent additives are not taken in the first spinning pipe upstream of the connection point, that part will be prone to deterioration.

[0005] The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a spinning machine that can reduce the area affected by the additive at the point where the air containing the additive flows in.

[0006] The problem to be solved by the present invention is as described above. Next, the means for solving this problem and the effects thereof will be explained.

[0007] According to an aspect of the present invention, there is provided a spinning machine having the following configuration. That is, the spinning machine includes a plurality of spinning units, a main pipe, a plurality of unit pipes, an adding section, and a connecting section. The spinning units produce and wind yarn. Compressed air flows through the main pipe toward the spinning units. The unit pipes branch off from the main pipe and connect the main pipe to the spinning units. The adding section supplies an additive to air to generate added air containing the additive. The connecting section connects the main pipe and the adding section, and has a delivery hole formed therein for delivering the added air, the delivery hole facing downstream of the main pipe.

[0008] This makes it difficult for the additive air delivered from the delivery hole of the connecting part to flow toward the upstream side of the main pipe, so that the part of the main pipe upstream of the connecting part is less susceptible to the influence of the additive.

[0009] In the spinning machine, it is preferable that the portion of the connection portion where the delivery hole is formed is located inside the main pipe.

[0010] This makes it even more difficult for the added air to flow toward the upstream side of the main pipe, compared to when the delivery hole is located outside the main pipe.

[0011] In the spinning machine, it is preferable that a center of the delivery hole coincides with a center of the main pipe.

[0012] This makes it easier for the added air to flow along the flow of the main pipe.

[0013] In the spinning machine, it is preferable that a mark for identifying the orientation of the delivery hole is formed on the outer surface of the connection portion.

[0014] This allows the outlet hole of the connection part to be oriented in the appropriate direction from the outside.

[0015] In the spinning machine, it is preferable that the portion of the inner surface of the main pipe corresponding to the upstream side of the connection portion is not coated to reduce the effect of the additive, and the portion corresponding to the downstream side of the connection portion is coated to reduce the effect of the additive.

[0016] This reduces the cost required for coating and prevents deterioration of the main pipe due to adhesion of additives. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a front view showing the overall configuration of a spinning machine according to an embodiment of the present invention; [Figure 2] FIG. 2 is a diagram showing the configuration of a compressed air supply unit and an adding unit. [Figure 3] FIG. 10 is an exploded perspective view of the connection point between the first spinning pipe and the connection portion. [Figure 4] Cross-sectional view of the connection point between the first spinning pipe and the connection part. [Figure 5] 10 is a cross-sectional view of the connection point between the first spinning pipe and the connection part of the first modified example. FIG. [Figure 6] A cross-sectional view of the connection point between the first spinning pipe and the connection part of the second modified example. [Figure 7] A cross-sectional view of the connection point between the first spinning pipe and the connection part of the third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, the spinning machine 1 of this embodiment will be described. As shown in Fig. 1, the spinning machine 1 includes a blower box 3, a control box 5, a plurality of spinning units 7, and a yarn splicing cart 9. The plurality of spinning units 7 are arranged side by side in a predetermined direction.

[0019] Inside the blower box 3, a blower 11 that functions as a negative pressure source and the like are arranged.

[0020] A central control device 13 and a display unit 15 are arranged inside the control box 5. The central control device 13 centrally manages and controls each part of the spinning machine 1. The central control device 13 can communicate with each spinning unit 7 (more specifically, the unit control unit). The display unit 15 displays a screen or the like based on information received by the central control device 13 from the spinning unit 7.

[0021] Each spinning unit 7 mainly includes, arranged in this order from upstream to downstream, a draft device 21, an air spinning device 23, a yarn storage device 25, and a winding device 27. In describing the spinning unit 7, "upstream" and "downstream" mean upstream and downstream in the running direction of the sliver, fiber bundle 34, or spun yarn 30 when winding the spun yarn 30.

[0022] The draft device 21 is provided near the upper end of a frame 36 included in the spinning machine 1. The draft device 21 includes four pairs of draft rollers. The draft device 21 sandwiches and transports sliver supplied from a sliver case (not shown) between the rollers of each draft roller pair, thereby stretching the sliver to a predetermined fiber amount and generating a fiber bundle 34. The fiber bundle 34 generated by the draft device 21 is supplied to an air spinning device 23 arranged downstream of the draft device 21.

[0023] The air spinning device 23 uses a swirling airflow to twist the fiber bundle 34 drafted by the draft device 21, producing the spun yarn 30. More specifically, the air spinning device 23 includes a fiber guide section (not shown), a spinning chamber, a spinning nozzle (a swirling airflow generating nozzle), and a hollow guide shaft. The fiber guide section guides the fiber bundle 34 supplied from the draft device 21 into the spinning chamber. The spinning nozzle is disposed around the path along which the fiber bundle 34 travels. Compressed air is sprayed from the spinning nozzle into the spinning chamber, generating a swirling airflow within the spinning chamber. This swirling airflow causes the fiber ends of the multiple fibers that make up the fiber bundle 34 to flip and swirl. The hollow guide shaft guides the produced spun yarn 30 from the spinning chamber to the outside of the air spinning device 23.

[0024] A yarn monitoring device 24 is provided downstream of the air spinning device 23. The spun yarn 30 produced by the air spinning device 23 passes through the yarn monitoring device 24 before being stored in the yarn storage device 25.

[0025] The yarn monitoring device 24 monitors the thickness and other characteristics of the traveling spun yarn 30 using a light transmission sensor, and detects yarn defects in the spun yarn 30. When the yarn monitoring device 24 detects a yarn defect in the spun yarn 30, it transmits a yarn defect detection signal to the unit control unit.

[0026] When the unit control unit receives a yarn defect detection signal from the yarn monitoring device 24, it cuts the spun yarn 30 by stopping the driving of the air spinning device 23 and / or the draft device 21. The spun yarn 30 may also be cut using a cutter.

[0027] The yarn pooling device 25 includes a yarn pooling roller 38. The yarn pooling roller 38 is driven to rotate by a motor (not shown). The yarn pooling roller 38 winds the spun yarn 30 around its outer circumferential surface and temporarily stores the spun yarn 30. By rotating at a predetermined rotational speed with the spun yarn 30 wound around its outer circumferential surface, the yarn pooling roller 38 pulls out the spun yarn 30 from the air spinning device 23 located upstream at a predetermined speed and transports it downstream.

[0028] In this way, the yarn pooling device 25 can temporarily pool the spun yarn 30 on the outer peripheral surface of the yarn pooling roller 38, and therefore functions as a kind of buffer for the spun yarn 30. This can eliminate problems (such as slack in the spun yarn 30) caused by a mismatch between the spinning speed in the air spinning device 23 and the winding speed of the spun yarn 30 for some reason.

[0029] The winding device 27 includes a cradle arm 41, a winding drum 43, and a traverse guide 45. The cradle arm 41 is supported so as to be swingable about a support shaft, and can rotatably support a bobbin 51 for winding the spun yarn 30. The winding drum 43 rotates while in contact with the outer peripheral surface of the bobbin 51 or the package 53, thereby rotating the package 53 in the winding direction. The winding device 27 drives the winding drum 43 by an electric motor (not shown) while reciprocating the traverse guide 45 by a driving means (not shown). As a result, the winding device 27 traverses the spun yarn 30 and winds the spun yarn 30 onto the package 53.

[0030] As shown in FIG. 1 , rails 61 are arranged on the frame 36 of the spinning machine 1 in the direction in which the multiple spinning units 7 are lined up. The yarn splicing cart 9 travels on the rails 61 and can move relative to the multiple spinning units 7. A yarn splicing device 65 is provided on the yarn splicing cart 9. The yarn splicing cart 9 travels to the spinning unit 7 where a yarn breakage has occurred and uses the yarn splicing device 65 to perform a yarn splicing operation on that spinning unit 7.

[0031] Next, a configuration for supplying compressed air and additives to each spinning unit 7 will be described with reference to Fig. 2. In the following description, "upstream" and "downstream" refer to upstream and downstream in the flow direction of compressed air.

[0032] The spinning machine 1 further includes a compressed air supply unit 70 and an adding unit 90. The compressed air supply unit 70 includes a first inlet pipe 71, a second inlet pipe 72, a branch pipe 75, a first spinning pipe (main pipe) 76, a second spinning pipe 77, a first unit pipe (unit pipe) 78, and a second unit pipe 79.

[0033] The first inlet pipe 71 is connected to an air supply source 81. The air supply source 81 is a known compressor. Compressed air sent out from the air supply source 81 flows through the first inlet pipe 71. A second inlet pipe 72 is connected to the downstream end of the first inlet pipe 71 via a first main valve 82 that can be switched between an open and closed state. The compressed air from the first inlet pipe 71 flows through the second inlet pipe 72.

[0034] A filter 83 and a regulator 84 are disposed in the second inlet pipe 72. The filter 83 separates particulate matter in the compressed air from the compressed air to purify the compressed air. The regulator 84 adjusts the pressure of the compressed air. The compressed air that has been purified by the filter 83 and whose pressure has been adjusted by the regulator 84 is supplied to each spinning unit 7.

[0035] A branch pipe 75 is connected to the downstream end of the second introduction pipe 72. The branch pipe 75 branches into two pipes, which are connected to a first spinning pipe 76 and a second spinning pipe 77, respectively. As a result, compressed air sent out from the air supply source 81 flows through the first spinning pipe 76 and the second spinning pipe 77, respectively. The first spinning pipe 76 and the second spinning pipe 77 extend along the parallel arrangement direction of the spinning units 7. In this embodiment, the compressed air supply unit 70 is disposed at a first end of the spinning units 7 in the parallel arrangement direction, and the first spinning pipe 76 and the second spinning pipe 77 extend toward a second end in the parallel arrangement direction. Compressed air flows through the first spinning pipe 76 and the second spinning pipe 77 toward the spinning units 7.

[0036] A second main valve 85 that can be switched between an open and closed state is provided at the upstream end of the first spinning pipe 76 in the direction in which the compressed air flows. The second main valve 85 is located upstream of the connection point between the first spinning pipe 76 and the first unit pipe 78.

[0037] The first unit piping 78 is connected to the first spinning piping 76. Each first unit piping 78 supplies compressed air from the first spinning piping 76 to a corresponding spinning unit 7. The first unit piping 78 is provided with a first supply valve 86 that can be switched between open and closed states. Meanwhile, the second unit piping 79 is connected to the second spinning piping 77. Each second unit piping 79 supplies compressed air from the second spinning piping 77 to a corresponding spinning unit 7. The second unit piping 79 is provided with a second supply valve 87 that can be switched between open and closed states. The relationship between the unit piping and the spinning units is not limited to one to one, and may be one to multiple.

[0038] In the first spinning pipe 76, a mist of additive is supplied from the adding section 90 to a section between the second main valve 85 and the first unit pipe 78, which is the most upstream section. As a result, the mist of additive is mixed with the compressed air that is distributed and supplied to each spinning unit 7 via the first spinning pipe 76. On the other hand, the additive is not supplied from the adding section 90 to the second spinning pipe 77.

[0039] The additive supplied from the adding unit 90 to the first spinning pipe 76 is, for example, a chemical agent containing a component that prevents the accumulation of oil in the air spinning device 23. The additive in this embodiment is a liquid, but it may also be a gas. In addition to or instead of the component that prevents the accumulation of oil, the chemical agent may also be a chemical agent that can impart at least one of the following functions to the spun yarn 30: antibacterial, deodorizing, odor prevention, wax, etc.

[0040] The type of additive is determined appropriately in consideration of the needs required for the spun yarn 30. The operator puts an appropriate additive into the storage tank 93 depending on the raw material of the sliver used in the spinning machine 1.

[0041] Hereinafter, the compressed air containing the mist-like additive, which is supplied to each spinning unit 7 from the first spinning pipe 76 via the first unit pipe 78, may be referred to as "additive air." Also, the compressed air (compressed air containing no additive) supplied to each spinning unit 7 from the second spinning pipe 77 via the second unit pipe 79 may be referred to as "dry air."

[0042] When the spinning machine 1 is operating, the first main valve 82 is in an open state. When the fiber bundle 34 is spun using added air, the second main valve 85 and the first supply valve 86 are also in an open state, and the second supply valve 87 is in a closed state. On the other hand, when the fiber bundle 34 is spun using only dry air, the second main valve 85 and the first supply valve 86 are in a closed state, and the second supply valve 87 is in an open state. The open / closed state of each valve may be switched by the operator, the central control device 13, or the unit control unit.

[0043] Next, the addition unit 90 will be described in detail with reference to FIG.

[0044] At least one adding section 90 is provided in the spinning machine 1. One adding section 90 may be provided for each predetermined number of spinning units 7. As shown in FIG. 2 , the adding section 90 includes an inlet pipe 91, a pressure adjusting section 92, a storage tank 93, and a mist generating nozzle 94.

[0045] The upstream end of the inlet pipe 91 is connected to the compressed air supply unit 70. More specifically, the upstream end of the inlet pipe 91 (more specifically, the first inlet pipe 71, between the filter 83 and the regulator 84) flows compressed air from the second inlet pipe 72 into the inlet pipe 91. A pressure adjustment unit 92 is disposed in the inlet pipe 91. The pressure adjustment unit 92 adjusts the pressure of the compressed air. The pressure adjustment unit 92 is, for example, a pressure reducing valve.

[0046] The storage tank 93 is a pressure vessel capable of storing an additive. The mist generating nozzle 94 is placed in the liquid additive stored in the storage tank 93. When compressed air is injected from the mist generating nozzle 94, the compressed air is bubbled through the liquid additive, generating a mist of the additive. This bubbling causes the space above the liquid level of the additive in the storage tank 93 to be filled with the mist of the additive. In addition, the bubbling of the compressed air generates a flow of compressed air. In this way, the adding unit 90 generates the additive air.

[0047] The connection unit 100 connects the addition unit 90 and the first spinning pipe 76. In addition, the pressure adjustment unit 92 is set so that the pressure of the added air flowing through the connection unit 100 is greater than the pressure of the compressed air flowing through the first spinning pipe 76. As a result, the connection unit 100 sends (sprays) the added air generated in the addition unit 90 into the first spinning pipe 76. As a result, the added air generated in the addition unit 90 is mixed with the compressed air flowing through the first spinning pipe 76.

[0048] The added air generated in this manner further flows through the first spinning pipe 76 and is supplied to the spinning unit 7 via the first unit pipe 78. Specifically, the added air is supplied to the fiber bundle 34 from the spinning nozzle of the air spinning device 23 in the spinning unit 7. However, the added air may be supplied to a device other than the air spinning device 23, for example, to the fiber bundle 34 transported between the draft device 21 and the air spinning device 23.

[0049] Next, the configuration of the connection portion between the first spinning pipe 76 and the connection part 100 will be described with reference to FIGS.

[0050] 3, the first spinning pipe 76 is provided with a connection pipe 76a for attaching the connection part 100. The first spinning pipe 76 and the connection pipe 76a are connected by welding, for example, but they may also be connected using a fixture.

[0051] The axial direction of the connection pipe 76a is different from the axial direction of the first spinning pipe 76. In this embodiment, the angle formed between the axial direction of the connection pipe 76a and the axial direction of the first spinning pipe 76 is 90 degrees, but it may be other than 90 degrees. Also, instead of the connection pipe 76a, a through hole for attaching the connection part 100 may be formed. In other words, it is sufficient that the first spinning pipe 76 has an attachment structure for attaching the connection part 100.

[0052] The connection part 100 is connected to the connection pipe 76a. As shown in FIG.

[0053] The addition pipe 101 is connected to the addition unit 90 and is a pipe through which the addition air generated in the addition unit 90 flows. The addition pipe 101 is not limited to a pipe and may be a hose. In other words, the addition pipe 101 may or may not be flexible.

[0054] The coupling portion 102 is a portion that is coupled to the connection pipe 76a. In this embodiment, the coupling portion 102 is inserted into the connection pipe 76a via a sealing member such as an O-ring, thereby achieving a hermetic connection between the two. Note that the method for coupling the coupling portion 102 and the connection pipe 76a is one example, and they may also be coupled using, for example, a flange structure.

[0055] The delivery section 103 is located downstream of the connecting section 102. The delivery section 103 is a section for delivering the added air. Specifically, the delivery section 103 has an elongated cylindrical shape, and the added air flows along the longitudinal direction. The delivery section 103 is also formed with a delivery hole 103a. The added air is delivered (sprayed) from the delivery hole 103a.

[0056] The delivery hole 103a is located relatively close to the tip (downstream side) of the delivery section 103. Specifically, when the delivery section 103 is divided into two, three, or four equal parts in the longitudinal direction, the delivery hole 103a is located at the tip-most side. This makes it less likely that the delivery section 103 will obstruct the flow of compressed air in the first spinning pipe 76.

[0057] As described above, pipes such as the first spinning pipe 76 may be affected by additives. Specifically, depending on the material of the first spinning pipe 76 and the type of additive, a chemical reaction may occur, which may cause deterioration of the first spinning pipe 76. Furthermore, if a discharge structure for discharging liquefied additives within the first spinning pipe 76 is provided, this discharge structure must be provided in an area where the additives may be present.

[0058] Here, because there is a flow of compressed air flowing downstream in the first spinning pipe 76, it is expected that the added air will also flow downstream along with this flow. However, unless special measures are taken, there is a possibility that some of the added air will flow upstream from the connection point. In that case, it will be necessary to form a coating on the part upstream from the connection point to reduce the effect of the additive, or to provide an exhaust structure in that part as well.

[0059] In response to this, in this embodiment, measures are taken to make it difficult for the added air to flow upstream from the connecting portion, as will be described in detail below.

[0060] Specifically, the delivery hole 103a in this embodiment is formed to have directionality. Specifically, the orientation of the delivery hole 103a is determined so that the delivery hole 103a faces the downstream side of the first spinning pipe 76. Here, the orientation of the delivery hole 103a refers to one side of the axial direction of the delivery hole 103a. More specifically, it refers to a direction starting from the delivery hole 103a and moving away from the delivery section 103 along the axial direction. From another perspective, the orientation of the delivery hole 103a refers to the direction in which the added air is delivered from the delivery hole 103a. More specifically, the added air is delivered in various directions so as to diffuse from the delivery hole 103a, and the orientation of the delivery hole 103a refers to the central direction among these directions. Furthermore, the delivery hole 103a facing the downstream side of the first spinning pipe 76 means that the orientation of the delivery hole 103a includes a component of a direction toward the downstream side of the first spinning pipe 76. The downstream direction of the first spinning pipe 76 means a direction that is parallel to the axial direction of the first spinning pipe 76 and approaches the spinning unit 7. In other words, it is not required that the direction of the delivery hole 103a and the downstream direction of the first spinning pipe 76 strictly coincide with each other.

[0061] Furthermore, a mark 102a is provided on the connecting part 102. The mark 102a is used to identify the orientation of the delivery hole 103a. In this embodiment, when the connecting part 100 is viewed in the axial direction, the direction in which the mark 102a is provided relative to the axial position coincides with the direction in which the delivery hole 103a is formed relative to the axial position. Therefore, by attaching the connecting part 102 so that the mark 102a is located downstream of the first spinning pipe 76, the delivery hole 103a faces the downstream side of the first spinning pipe 76.

[0062] The mark 102a may have any configuration as long as it is visible to the operator. For example, the mark 102a may be formed by scraping the material that constitutes the connecting portion 102. Alternatively, the mark 102a may be a separate member attached. Furthermore, the direction in which the mark 102a is attached relative to the axial position may differ from the direction in which the delivery hole 103a is formed relative to the axial position. For example, a separate mark may be formed on the connection pipe 76a, and when the two marks align, the delivery hole 103a may be configured to face in an appropriate direction. Furthermore, the mark 102a is not an essential element and may be omitted.

[0063] Furthermore, the center of the delivery hole 103a coincides with the center of the first spinning pipe 76. If the cross section of the hole or pipe is circular, the center refers to the center and the area nearby. If the cross section of the hole or pipe is square, the center refers to the intersection of the diagonals and the area nearby. If the cross section of the hole or pipe is other than these, the center refers to a point that can be recognized as the geometric center and the area nearby. This makes it easier for the added air delivered from the delivery hole 103a to flow along with the flow of compressed air in the first spinning pipe 76.

[0064] When a plurality of delivery holes 103a are formed in the delivery section 103, the corresponding effect can be achieved as long as at least one of the delivery holes 103a satisfies the above-mentioned characteristics. It is more preferable that all of the delivery holes 103a have the characteristic of the direction of the delivery holes 103a.

[0065] The delivery section 103 of this embodiment is an example. For example, the delivery section 103 is not limited to a cylinder, and the cross-sectional shape may be other than a circle (for example, a rectangle). The delivery holes 103a are not limited to a cylinder, and may be other than a circle (for example, a rectangle). Furthermore, the positions and number of the delivery holes 103a may be different from those of this embodiment.

[0066] The connection section 100 only needs to have the function of supplying the added air to the first spinning pipe 76 in the appropriate direction, and as long as it has that function, the connection section 100 does not need to be divided into three sections such as the added pipe 101, the connecting section 102, and the delivery section 103.

[0067] In this embodiment, the additive air delivered from the delivery hole 103a does not easily flow upstream (i.e., toward the air supply source 81). Therefore, the portion of the inner surface of the first spinning pipe 76 that corresponds to the upstream side of the connection point is not coated to reduce the effects of the additive. The portion of the inner surface of the first spinning pipe 76 that corresponds to the downstream side of the connection point is coated with this type of coating. This reduces the cost of coating. Furthermore, in this embodiment, the portion of the inner surface of the first spinning pipe 76 that corresponds to the connection point is to be coated, but coating this portion may be omitted.

[0068] Next, various modifications of the above embodiment will be described with reference to Figures 5 to 7. In the following description of the modifications, the same or similar components as those in the above embodiment will be denoted by the same reference numerals in the drawings, and their description may be omitted.

[0069] 5, the axial directions of the first spinning pipe 76 and the connecting pipe 76a are different from those of the above embodiment. Specifically, while the first spinning pipe 76 in the above embodiment is straight, the first spinning pipe 76 in the first modification has a bent portion, and the connecting pipe 76a is connected to the bent portion. Therefore, the axial direction of the connecting pipe 76a coincides with the axial direction of the connecting pipe 76a downstream of the connection point.

[0070] In the first modified example, the delivery section 103 extends to the first spinning pipe 76 downstream of the connection point. Furthermore, the delivery hole 103a is formed on the tip surface of the delivery section 103. Note that the positions of the delivery section 103 and the delivery hole 103a can be changed as long as the delivery hole 103a faces the downstream side of the first spinning pipe 76.

[0071] 6, the axial directions of the first spinning pipe 76 and the connecting pipe 76a are different from those of the above embodiment. Specifically, in the above embodiment, the angle between the axial directions of the first spinning pipe 76 and the connecting pipe 76a is 90 degrees, but in the second modification, the angle between the axial directions of the first spinning pipe 76 and the connecting pipe 76a is less than 90 degrees. More specifically, in order to smoothly guide the added air along the flow of the first spinning pipe 76, the connecting pipe 76a is inclined so that it approaches the downstream side of the first spinning pipe 76 as it approaches the connection point between the connecting pipe 76a and the first spinning pipe 76.

[0072] In the second modified example, the delivery section 103 does not reach the first spinning pipe 76. The delivery section 103 is arranged along the axial direction of the connection pipe 76a, and a delivery hole 103a is formed on the tip surface. Even in this configuration, the axial direction of the delivery hole 103a (upper right direction in FIG. 6) includes a component toward the downstream side of the first spinning pipe 76 (to the right), and therefore, the delivery section 103a has the characteristic of facing the downstream side of the first spinning pipe 76. In this way, it is not an essential feature that the delivery section 103 extends to the first spinning pipe 76.

[0073] The features of the delivery section 103 in the above embodiment may be applied to the piping layout of the second modified example. For example, in the second modified example, the delivery section 103 may extend to the first spinning pipe .

[0074] 7, the piping layout is different from that of the above-described embodiment. Specifically, in the above-described embodiment, compressed air is supplied to the first end of the first spinning piping 76, and flows toward the second end. In contrast, in the third modified example, compressed air is supplied to a midway portion of the first spinning piping 76 (more specifically, a portion corresponding to a midway position of the spinning units 7 arranged in parallel), and the compressed air flows from the midway portion toward both the first end and the second end (in other words, toward the spinning unit 7 on the first end side and the spinning unit 7 on the second end side).

[0075] In the layout of the third modified example, the additional air also needs to be delivered to both sides. Therefore, the delivery section 103 of the third modified example has both delivery holes 103a facing the first side and delivery holes 103a facing the second side. In this piping layout, both the first side and the second side correspond to the downstream side of the first spinning piping 76.

[0076] As described above, the spinning machine 1 of this embodiment includes multiple spinning units 7, a first spinning pipe 76, multiple first unit pipes 78, an adding section 90, and a connecting section 100. The spinning units 7 produce and wind yarn. Compressed air flows through the first spinning pipe 76 toward the spinning units 7. The first unit pipe 78 branches off from the first spinning pipe 76 and connects the first spinning pipe 76 to the spinning units 7. The adding section 90 supplies an additive to air to generate additive air containing the additive. The connecting section 100 connects the first spinning pipe 76 and the adding section 90, and is provided with an outlet hole 103a for delivering the additive air. The outlet hole 103a faces downstream of the first spinning pipe 76.

[0077] This makes it difficult for the additive air delivered from the delivery hole 103a of the connection part 100 to flow toward the upstream side of the first spinning pipe 76. As a result, the portion of the first spinning pipe 76 upstream of the connection part 100 is less susceptible to the influence of the additive.

[0078] In the spinning machine 1 of this embodiment, the coupling portion 102 in which the delivery hole 103a is formed of the connection portion 100 is located inside the first spinning pipe 76.

[0079] This makes it even more difficult for the added air to flow toward the upstream side of the first spinning pipe 76 compared to when the delivery hole 103a is located outside the first spinning pipe 76.

[0080] In the spinning machine 1 of this embodiment, the center of the delivery hole 103a and the center of the first spinning pipe 76 coincide with each other.

[0081] This makes it easier for the added air to flow along the flow of the first spinning pipe 76.

[0082] In the spinning machine 1 of this embodiment, a mark 102a is formed on the outer surface of the connection part 100 to identify the orientation of the delivery hole 103a.

[0083] This allows the outlet hole of the connection part 100 to be oriented in the appropriate direction from the outside.

[0084] In the spinning machine 1 of this embodiment, the connecting portion 102 on the inner surface of the first spinning pipe 76, which corresponds to the upstream side of the connection portion 100, is not coated to reduce the effects of the additives, while the connecting portion 102, which corresponds to the downstream side of the connection portion 100, is coated to reduce the effects of the additives.

[0085] This reduces the cost required for coating and prevents deterioration of the main pipe due to adhesion of additives.

[0086] The preferred embodiment of the present invention has been described above, but the above configuration can be modified, for example, as follows. Each modification may be made alone, or multiple modifications may be made in any combination.

[0087] In the above embodiment, the spinning machine 1 includes the first spinning pipe 76 for the additional air and the second spinning pipe 77 for the dry air. Alternatively, the second spinning pipe 77 may be omitted from the spinning machine 1.

[0088] In the above embodiment, the compressed air supplied to the first spinning pipe 76 and the compressed air used in the adding section 90 are generated by a common air supply source 81. Alternatively, the compressed air may be generated by individual air supply sources 81.

[0089] In the above embodiment, the adding unit 90 generates the additive in a mist form by bubbling. Alternatively, the additive in a gaseous form may be stored in a tank or the like, and the additive may be sprayed from the delivery hole 103a. [Explanation of symbols]

[0090] 1. Spinning machine 7 Spinning Unit 70 Compressed air supply unit 76 No. 1 spinning pipe (main pipe) 78 First unit piping (unit piping) 90 Addition part 100 Connection 101 Addition piping 102 Connection part 103 Transmission Unit 103a Outlet hole

Claims

1. a plurality of spinning units for producing and winding yarn; a main pipe through which compressed air flows toward the spinning unit; a plurality of unit pipes branching from the main pipe and connecting the main pipe to the spinning units, respectively; an adding unit that supplies an additive to air to generate additive air containing the additive; a connection portion connecting the main pipe and the adding portion, the connection portion having a delivery hole formed therein for delivering the added air, the delivery hole facing a downstream side of the main pipe; A spinning machine comprising:

2. The spinning machine according to claim 1, A spinning machine, wherein a portion of the connection portion where the delivery hole is formed is located inside the main pipe.

3. The spinning machine according to claim 1 or 2, A spinning machine, characterized in that a center of the delivery hole and a center of the main pipe coincide with each other.

4. A spinning machine according to any one of claims 1 to 3, A spinning machine, characterized in that a mark for identifying the orientation of the delivery hole is formed on an outer surface of the connection portion.

5. A spinning machine according to any one of claims 1 to 4, A spinning machine characterized in that a portion of the inner surface of the main pipe corresponding to the upstream side of the connection portion is not coated to reduce the effect of the additive, and a portion corresponding to the downstream side of the connection portion is coated to reduce the effect of the additive.

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