JP2012246578A - Pneumatic duct of fine spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic apparatus providing the sucking action by negative pressure source on a pneumatic duct comprised of a plurality of connected ducts from both ends thereof, in which division positions in the longitudinal direction of the pneumatic duct can be arbitrary arranged and the cantilever form of the support of the duct is prevented.SOLUTION: A pneumatic duct 11 having both ends connected to negative pressure sources 12 and 13 includes a plurality of ducts 17 connected and is divided at an intermediate portion thereof in the longitudinal direction through a partition member 18. The partition member 18 is arranged such that a plate member is folded in the U form to doubly form a partition portion 22. An inflow hole 24 which intakes an external air of the pneumatic duct 11 to the interior of the pneumatic duct 11 is formed in the partition portion 22.

Description

  The present invention relates to a pneumatic duct of a spinning machine.

  Generally, a ring spinning machine is equipped with a pneumatic device (pneumatic device) that reliably sucks the fleece when the yarn breaks in order to prevent the fleece sent from the drafting device when the yarn breaks from affecting the weights other than the yarn breakage weight. (See, for example, Patent Document 1). The pneumatic apparatus includes a pneumatic duct (suction duct) disposed so as to extend along the longitudinal direction of a spinning machine base, and a suction nozzle connected to the pneumatic duct via a suction pipe or directly. . The pneumatic duct is configured by connecting a plurality of ducts. The pneumatic duct is connected to an intake box as a negative pressure source arranged at one end of the spinning machine base. Negative pressure acts on the pneumatic duct from the intake box, and the suction nozzle is connected to the pneumatic duct. The suction action reaches to.

Conventionally, a configuration in which a negative pressure source is provided at both ends of a pneumatic duct as a pneumatic device has also been disclosed (see, for example, Patent Document 2).
In recent years, while a multi-spindle specification exceeding 1200 spindles has been implemented in a ring spinning machine, a negative pressure source is provided only on one end side of a pneumatic duct as in the past as a pneumatic device that sucks and collects fleece of broken thread spindles. Instead, a configuration in which a negative pressure source is provided on the other end side of the pneumatic duct and suction is performed from both sides is also considered. The reason is to suppress the power increase more than the one-side suction, but it is necessary to divide the pneumatic duct at the middle part.

Japanese Patent Laid-Open No. 11-12861 JP 2004-107835 A

  However, the pneumatic duct divided into two in the longitudinal direction has a problem that the support of the end portion on the divided side becomes cantilever and the suction height positions of the suction nozzles are not aligned. There is also a problem that it becomes difficult to divide the pneumatic duct at an arbitrary position in the longitudinal direction.

  An object of the present invention is a pneumatic device configured to exert a suction action by a negative pressure source from both ends of a pneumatic duct configured by connecting a plurality of ducts, and can arbitrarily set a division position in the longitudinal direction of the pneumatic duct, An object of the present invention is to provide a pneumatic duct for a spinning machine that can prevent the support of the duct from being cantilevered.

  In order to achieve the above object, the invention according to claim 1 is a pneumatic duct of a spinning machine which is disposed along a longitudinal direction of a machine base of the spinning machine and whose both ends communicate with a negative pressure source. The pneumatic duct is configured by connecting a plurality of ducts, and is divided at a middle portion in the longitudinal direction via a partition member.

  In this invention, since the pneumatic duct receives a suction action from both ends thereof by a negative pressure source, power consumption can be suppressed as compared with a configuration in which the suction action is received only from one side. Since the pneumatic duct is divided at the intermediate portion in the longitudinal direction via the partition member, the division position in the longitudinal direction of the pneumatic duct can be arbitrarily set. Also, the ends of the divided pneumatic ducts do not become separated from each other, and even if the pneumatic duct is divided, the supports of the ends of the ducts located on both sides of the divided part may be cantilevered. The suction height position of the suction nozzles is aligned.

  According to a second aspect of the present invention, in the first aspect of the present invention, the partition member is formed such that the plate member is bent in a U-shape and the partition portion is doubled. In this invention, since the partition part is formed double, in the case of a configuration in which the partition member is arranged in a state in contact with the inner surface of the duct in the middle part of the duct, compared to the case where the partition part is single, A partition member becomes difficult to bend.

  According to a third aspect of the present invention, in the second aspect of the present invention, the partition member is formed with a fitting portion bent at an end opposite to the U-shaped bent portion, and the fitting portion is It is fixed to the back plate or the bottom plate in a state of being fitted to the back plate or the bottom plate of the duct. In this invention, since the fitting part integrally formed with the partition member is fixed to the back plate or the bottom plate by fitting to the back plate or the bottom plate, it is fixed by a fastener such as a bolt, an adhesive, welding or the like. Compared to the case, the fixing work becomes easier.

  According to a fourth aspect of the present invention, in the invention according to the second or third aspect, an inflow hole is formed in the partition portion of the partition member so that air outside the pneumatic duct is taken into the pneumatic duct. ing. In the pneumatic duct, in order to prevent stagnation on the end side opposite to the negative pressure source, it is preferable to provide an inflow hole for taking in air outside the pneumatic duct on the side opposite to the negative pressure source of the pneumatic duct. In this invention, since the inflow hole is formed in the partition part, it is not necessary to form the inflow hole in the duct. Moreover, since it is not necessary to distinguish between the duct to which the partition member is fixed and the other duct when assembling the pneumatic duct, the assembling work is facilitated.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein a seal member is provided between the partition member and the inner surface of the duct. In the present invention, it is easy to ensure the airtightness between the partition member and the inner surface of the duct even when the manufacturing accuracy of the partition member and the duct is poor as compared with the configuration in which the partition member directly contacts the inner surface of the duct.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the partition member is formed with a bifurcated partition, and a back plate or a bottom plate of the duct. It has two branch side parts which have a part connected, and it is formed so that the distance between the two branch side parts may become so large that it approaches the back plate or the bottom plate. Here, the “branch side portion” means a portion extending in a branching manner among the portions formed in a bifurcated shape. In this invention, the accumulation of the fluff between two partition parts is suppressed compared with the partition member formed so that two partition parts may extend in parallel in the state where the space | interval is narrow.

  According to the present invention, in a pneumatic device configured to exert a suction action by a negative pressure source from both ends of a pneumatic duct configured by connecting a plurality of ducts, the division position in the longitudinal direction of the pneumatic duct can be arbitrarily set, It is possible to provide a spinning machine pneumatic duct capable of preventing the support of the duct from being cantilevered.

(A) is the schematic diagram of the spinning machine which shows arrangement | positioning of a pneumatic device, (b) is a partial schematic perspective view of a duct. (A) is a side view of a duct, (b) is a partial schematic perspective view of a duct, and (c) is a partial perspective view of a back plate. The schematic perspective view seen from the backplate side which shows the relationship between a duct and a partition member. (A) is the perspective view which looked at the partition member from the side surface side, (b) is the perspective view which looked at the partition member from the upper side. (A) is a schematic plan view which shows the relationship between the partition member and duct of another embodiment, (b) is a perspective view of a partition member. The schematic plan view of the duct of another embodiment. (A) is a side view of the duct of another embodiment, (b) is a perspective view of a partition member. (A) is a schematic plan view which shows the connection state of the duct of another embodiment, (b) is a schematic cross section which shows the duct and partition member of another embodiment.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1 (a), the pneumatic device 10 is disposed so that the pneumatic duct 11 extends along the longitudinal direction of the spinning machine (the left-right direction in FIG. 1 (a)), and both end portions thereof are arranged. A negative pressure source 12 provided on the out-end side of the spinning machine and a negative pressure source 13 provided on the gear end side are communicated. The negative pressure sources 12 and 13 include a filter box 15 partitioned by a filter 14 into an accommodating portion 15a and a chamber 15b, and a motor 16 that is accommodated in the chamber 15b and includes a fan 16a. Then, the drive of the motor 16 causes the filter box 15 to have a negative pressure, and a suction action is exerted on a suction nozzle (not shown) connected to the pneumatic duct 11.

  As shown in FIG. 1A, the pneumatic duct 11 is configured by connecting a plurality of ducts 17, and the pneumatic duct 11 is divided through a partition member 18 at an intermediate portion in the longitudinal direction. Each duct 17 is supported by a spring piece (support frame) 19. As shown in FIGS. 1A and 1B, in this embodiment, the partition member 18 is provided in the middle portion of the duct 17.

  As shown in FIGS. 1B and 2A, 2B, the duct 17 has a substantially pentagonal cross section in which a part of a rectangle is cut out by a substantially U-shaped component piece 20 and a back plate 21. It is formed in a cylindrical shape. The component piece 20 constitutes the upper wall 17a, the suction nozzle mounting wall 17b, the front wall 17c, and the bottom wall 17d of the duct 17, and the back plate 21 constitutes the rear wall 17e of the duct 17. The suction nozzle mounting wall 17b is formed obliquely downward and has a hole 17f for mounting the suction nozzle. The component piece 20 and the back plate 21 are formed, for example, by bending a metal plate having a thickness of about 1 mm. The duct 17 is formed to have a length of about 2 m, for example, and is tapered so that the cross-sectional area gradually increases from the first end (the right end in FIG. 2B) toward the second end. ing. The difference in the thickness of the duct 17 at both ends is about the difference in thickness between the component piece 20 and the back plate 21.

  As shown in FIGS. 2B and 2C, a notch 21 a is formed at the first end of the back plate 21. Although not shown, a similar notch 21 a is also formed at the second end of the back plate 21. The back plate 21 has a bent portion 21 b bent toward the inside of the duct 17 at a portion sandwiched between both cutout portions 21 a. A folded portion 20a that sandwiches the bent portion 21b of the back plate 21 is formed in a portion of the top piece 17a and the bottom wall 17d of the component piece 20 facing the back plate 21. As shown in FIG. 2B, the folded portion 20a is cut out at a portion corresponding to the cutout portion 21a of the back plate 21 at a position located inside the duct 17 from the bent portion 21b. The component piece 20 and the back plate 21 are assembled together with the folded portion 20a of the component piece 20 sandwiching the bent portion 21b of the back plate 21 to form the duct 17. The adjacent ducts 17 are inserted into the second end of the other duct 17 by inserting the first end of one duct 17 in a state where the folded portions 20a of the component pieces 20 do not exist. They are connected to each other.

  As shown in FIG. 3, the duct 17 to which the partition member 18 is fixed has a back plate 21 divided into two in the longitudinal direction. As shown in FIGS. 4A and 4B, the partition member 18 is formed by folding a plate material into a U shape so that the partition portion 22 is doubled. The partition member 18 has a fitting portion 23 bent at the end opposite to the U-shaped bent portion 18 a, that is, the end opposite to the bent portion 18 a of each partition 22. The partition member 18 is fixed to the back plate 21 with the fitting portion 23 fitted to the back plate 21 of the duct 17. Each partition 22 is formed with an inflow hole 24 for taking air outside the pneumatic duct 11 into the pneumatic duct 11. The inflow hole 24 is formed at a position near the bottom surface of the duct 17. The inflow hole 24 is formed as a long hole extending along the bottom surface of the duct 17. In addition, in FIG. 3, illustration of the bending part 21b of the backplate 21 is abbreviate | omitted.

  As shown in FIGS. 1B and 3, a seal member 25 is provided between the partition member 18 and the inner surface of the duct 17. The seal member 25 is formed in a band shape, and is provided between the partition member 18 and the component piece 20 in a state in which the peripheral edge portion of the partition member 18 excluding the fitting portion 23 of the partition member 18 abuts. Yes.

  When assembling the pneumatic duct 11, first, the first end of the first duct 17 is connected to a predetermined position of the filter box 15 of the negative pressure source 12 on the out-end side. Next, the remaining ducts 17 are placed one by one on the spring piece 19 in order, and the first ends thereof are moved so as to be inserted into the second ends of the previous duct 17 and are sequentially connected. The duct 17 to be finally connected has a second end connected to the filter box 15 of the negative pressure source 13 on the gear end side. It should be noted that the duct 17 can be moved relative to the filter box 15 so that the duct 17 can be moved without any trouble during the operation of connecting the last duct 17 to the front duct 17 and the filter box 15 on the gear end side. It is connected via a flexible connecting part.

Next, the operation of the pneumatic device configured as described above will be described.
During the operation of the spinning machine, the motor 16 of the negative pressure sources 12 and 13 is driven, the inside of the filter box 15 becomes negative pressure, and the negative pressure acts on the pneumatic duct 11 from both ends of the pneumatic duct 11. As a result of the negative pressure, a suction air flow is generated in each suction nozzle, and an air flow from the hole 17f toward the filter box 15 flows. The fluff attached to the spinning fleece and the fleece fed from the draft device when the yarn breaks are sucked by the suction nozzle, and are carried to the filter box 15 by riding on the airflow toward the filter box 15 in the pneumatic duct 11. The And the fiber wastes, such as fluff conveyed to the filter box 15, are captured by the filter 14 and stored in the accommodating portion 15a.

  Since the pneumatic duct 11 receives the suction action from the negative pressure sources 12 and 13 from both ends thereof, the power consumption can be suppressed as compared with the configuration that receives the suction action only from one side. In addition, since air outside the pneumatic duct 11 flows into the pneumatic duct 11 not only from the suction nozzle but also from the inlet hole 24 formed in the partition portion 22 that divides the pneumatic duct 11, the negative pressure source 12. , 13 is prevented from stagnation in the pneumatic duct 11 in the vicinity of the partitioning portion 22 which is located far from the front.

  Although the pneumatic duct 11 is divided at the intermediate portion in the longitudinal direction via the partition member 18, the ends of the divided pneumatic duct 11 are not separated from each other, and even if the pneumatic duct 11 is divided. The ends of the duct 17 located on both sides of the divided portion are not in a free state and are not cantilevered. Also. The division of the pneumatic duct 11 can be easily handled by forming the back plate 21 of the duct 17 that is the division position in a state of being divided at the division position. Therefore, the division position in the longitudinal direction of the pneumatic duct 11 can be arbitrarily set.

According to this embodiment, the following effects can be obtained.
(1) The pneumatic duct 11 whose both ends are communicated with the negative pressure sources 12 and 13 is configured by connecting a plurality of ducts 17 and is divided through a partition member 18 at an intermediate portion in the longitudinal direction. Yes. Therefore, in the pneumatic device configured to exert a suction action on the pneumatic duct 11 from the negative pressure sources 12 and 13 provided at both ends of the pneumatic duct 11 configured by connecting a plurality of ducts 17, the longitudinal direction of the pneumatic duct 11 is determined. The division position can be arbitrarily set, the support of the duct 17 can be prevented from being cantilevered, and the suction height positions of the suction nozzles are aligned. Further, even if the pneumatic duct 11 is divided into two parts, it is not completely separated at the divided part, so that it is not necessary to perform a work for covering each divided end part of the pneumatic duct 11.

  (2) As for the partition member 18, the board | plate material is bend | folded in U shape and the partition part 22 is formed in double. Therefore, in the case where the partition member 18 is arranged at the intermediate portion of the duct 17 so as to be in contact with the inner surface of the duct 17, the partition member 18 is less likely to bend than when the partition portion 22 is single.

  (3) The partition member 18 has a fitting portion 23 bent at the end opposite to the U-shaped bent portion 18 a, and the fitting portion 23 is fitted to the back plate 21 of the duct 17. It is fixed to the face plate 21. Therefore, the fixing operation is simplified as compared with the case where the partition member 18 is fixed to the rear plate 21 by a fastener such as a bolt, an adhesive, or welding. In addition, since the partition member 18 and the back plate 21 are fixed by fitting the fitting portion 23 with the back plate 21, the partition member 18 also serves to position and fix the back plate 21.

  (4) The partition portion 22 of the partition member 18 is formed with an inflow hole 24 for taking air outside the pneumatic duct 11 into the pneumatic duct 11. Therefore, it is not necessary to form the inflow hole 24 in the duct 17.

  (5) A seal member 25 is provided between the partition member 18 and the inner surface of the duct 17. Therefore, as compared with the configuration in which the partition member 18 is in direct contact with the inner surface of the duct 17, the airtightness between the partition member 18 and the inner surface of the duct 17 can be ensured even if the manufacturing accuracy of the partition member 18 and the duct 17 is poor. It becomes easy.

  (6) The duct 17 includes a back plate 21 constituting the rear wall 17e, a remaining upper wall 17a, a suction nozzle mounting wall 17b, a front wall 17c, and a bottom wall 17d among the walls constituting the duct 17. It consists of two members with the piece 20. The duct 17 is divided into two parts by fixing the partition member 18 to the back plate 21. Therefore, the duct 17 can be easily divided at the target position by changing the dividing position of the back plate 21 using the partition member 18 having the same configuration.

  (7) The pneumatic duct 11 is not divided at the connecting portion of the adjacent ducts 17 but is divided at the middle portion of one duct 17. Therefore, all the lengths of the ducts 17 are the same, and only the duct 17 provided with the partition member 18 can be dealt with by changing the configuration of the back plate 21 (changing the length of the back plate 21). Further, the assembling work is not different between the duct 17 to which the partition member 18 is fixed and the other ducts 17 when the pneumatic duct 11 is assembled, and the assembling work becomes easy.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The partition member 18 is not limited to a shape in which the partition portion 22 extends in a direction orthogonal to the longitudinal direction of the duct 17, and the partition portion 22 may be formed in a bifurcated shape, for example. More specifically, as shown in FIGS. 5A and 5B, the front side portion 22 a of the partition portion 22 extends perpendicularly to the front wall 17 c of the duct 17 and is fixed to the back plate 21. May be fixed to the duct 17 while extending obliquely with respect to the longitudinal direction of the duct 17. That is, the partition member 18 has two branch side portions 22b having portions that are connected to the back plate 21 of the duct 17 and the partition portion 22 is formed in a bifurcated shape, and between the two branch side portions 22b. It is formed so that the distance increases as it approaches the back plate 21. Further, the back plate 21 of the duct 17 to which the partition member 18 is fixed is formed so that the length thereof is shorter than the other part of the duct 17 corresponding to the interval between the two branch side portions 22b. And the inflow hole 24 is formed in the branch side part 22b, respectively. Even if the partition member 18 has two partition portions 22, when each partition portion 22 is formed so as to extend in a direction orthogonal to the longitudinal direction of the duct 17 as in the above-described embodiment, the two partition portions 18 The interval between the portions 22 cannot be increased. However, in this embodiment, since the interval between the two partition portions 22 can be increased in the branch side portion 22b, accumulation of fluff between the two partition portions 22 is suppressed.

  In the case where the duct 17 is divided by the partition member 18 having the bifurcated partition portion 22, the partition member 18 may be formed integrally with the back plate 21. For example, as shown in FIG. 6, the partition member 18 and the back plate 21 are integrally formed with a single plate material. When the partition member 18 and the back plate 21 are separate, the partition member 18 and the two back plates 21 are required. However, when the partition member 18 is formed integrally with the back plate 21, the number of parts is reduced. Can be reduced.

  ○ As a configuration in which the partition member 18 and the back plate 21 are formed integrally, the partition member 18 and the back plate 21 that are separately formed are fixed by welding or the like instead of being formed by bending one plate material. It may be integrated.

  ○ Instead of configuring the duct 17 with the substantially U-shaped component piece 20 and the back plate 21, as shown in FIG. 7A, the upper wall 17a of the duct 17, the suction nozzle mounting wall 17b, the front wall 17c, and You may comprise with the substantially U-shaped structural piece 26 which comprises the rear wall 17e, and the baseplate 27 which comprises the bottom wall 17d. The component piece 26 has a folded portion 26a formed at the lower ends of the upper wall 17a and the rear wall 17e. The bottom plate 27 is formed with a bent portion 27a sandwiched between the folded portion 26a of the upper wall 17a and the rear wall 17e. When the duct 17 includes the component piece 26 and the bottom plate 27, the bottom plate 27 is divided into two parts in the duct 17 provided with the partition member 18. The partition member 18 is fixed in a state where the fitting portion 23 provided in the partition portion 22 is fitted to the bottom plate 27.

  The partition member 18 is not limited to a configuration in which the plate material is bent in a U shape and the partition portion 22 is formed in a double shape, and includes a single partition portion 22 as shown in FIG. You may make it the structure by which the fitting part 23 is formed in the both sides of the one end. In this case, the inflow hole 24 through which the air outside the pneumatic duct 11 is taken into the interior of the pneumatic duct 11 is not formed in the partition portion 22, but the upper wall 17 a or the rear wall 17 e of the duct 17 divided by the partition member 18. It is formed near the partition part 22 of the lower part or the bottom wall 17d.

  ○ In the partition member 18 in which the partition portion 22 is formed in a bifurcated shape, the partition portion 22 is not formed by bending a single plate material, for example, the partition portion 22 is formed by a plurality of plate materials, and the fitting portion 23 is welded or adhesive. It may be formed by adhering.

  In the case of connecting the ducts 17 by fitting the first end of one adjacent duct 17 into the second end of the other duct 17, the duct 17 does not need to be tapered. . For example, as shown to Fig.8 (a), the fitting part 30 which formed the cross-sectional area larger than the cross-sectional area of another part in the 1st end part of the duct 17 is formed, and the fitting part 30 is made into another duct. The ducts 17 may be connected to each other by fitting to the second end portions of the 17.

  The partition member 18 is not limited to the configuration that is connected and fixed to the back plate 21 or the bottom plate 27 by the fitting portion 23. For example, instead of the fitting portion 23, a connecting piece extending in parallel with the back plate 21 or the bottom plate 27 is provided, and the connecting piece and the end of the back plate 21 or the bottom plate 27 are fixed with a fastener, or with an adhesive. It may be fixed.

  ○ The pneumatic duct 11 only needs to be divided through a partition member in the middle portion in the longitudinal direction, and the partition position is not limited to the middle portion of the duct 17, and a partition member is provided at a connecting portion of adjacent ducts 17. The partition member may also be used as a connecting member. For example, as shown in FIG. 8B, the partition member 29 has a configuration in which fitting recesses 29a into which ends of the duct 17 are fitted are formed on both sides thereof. The material of the partition member 29 is not particularly limited, but in the case of resin or rubber, the sealing performance with the duct 17 is improved without providing a seal member. Moreover, as a structure which connects the adjacent duct 17, a flange part may be formed in the both ends of the duct 17, and the flange parts of the adjacent duct 17 may be fastened and connected with fasteners, such as a volt | bolt and a nut.

  O When using as the partition member 29 the thing in which the fitting recessed part 29a by which the edge part of the duct 17 is fitted on both sides is used, you may connect with the partition member 29 while dividing one duct 17 into two.

  ○ When the pneumatic duct 11 is divided at the connecting portion of the adjacent ducts 17 and each duct 17 is used with flange portions formed at both ends, the outer shape of the partition member is substantially the same as the outer shape of the flange portion. A flat plate may be used. And the flat plate as a partition member is fastened with the duct 17 with the fastener used for the connection of the duct 17.

  In the case where the pneumatic duct 11 is divided at the connecting portion of the adjacent ducts 17, the partition member 18 may have a configuration in which a plate member is bent in a U shape and the partition portion 22 is formed in a double shape. .

O Instead of forming the seal member 25 separately from the partition member 18, the seal member 25 may be integrally fixed to a portion of the partition portion 22 that faces the inner surface of the duct 17.
○ The seal member 25 may be omitted.

The ducts 17 constituting the pneumatic duct 11 are not necessarily all the same length.
The inflow hole 24 may not be provided, but when the inflow hole 24 is not provided, the inflow hole 24 may be provided because air stagnates and the fluff easily accumulates at the split side end of the pneumatic duct 11. preferable.

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention according to any one of claims 1 to 6, the partition member is provided at an intermediate portion of the duct.

  DESCRIPTION OF SYMBOLS 11 ... Pneumatic duct, 12, 13 ... Negative pressure source, 17 ... Duct, 18, 29 ... Partition member, 18a ... Bending part, 21 ... Back plate, 22 ... Partition part, 22b ... Branching side part, 23 ... Fitting part 24 ... Inflow holes, 25 ... Seal members, 27 ... Bottom plate.

Claims (6)

It is a pneumatic duct of a spinning machine that is disposed along the longitudinal direction of the machine base of the spinning machine and whose both ends communicate with a negative pressure source,
The pneumatic duct is a pneumatic duct of a spinning machine that is configured by connecting a plurality of ducts and is divided through a partition member at an intermediate portion in the longitudinal direction.   2. The pneumatic duct of a spinning machine according to claim 1, wherein the partition member is formed by bending a plate material into a U-shape to form a double partition portion.   In the partition member, a fitting portion is bent at an end opposite to the U-shaped bent portion, and the back plate or the bottom plate in a state where the fitting portion is fitted to the back plate or the bottom plate of the duct. The pneumatic duct of a spinning machine according to claim 2, which is fixed to a bottom plate.   The pneumatic duct of a spinning machine according to claim 2 or 3, wherein an inflow hole for taking in air outside the pneumatic duct into the pneumatic duct is formed in the partition portion of the partitioning member.   The pneumatic duct for a spinning machine according to any one of claims 1 to 4, wherein a seal member is provided between the partition member and the inner surface of the duct.   The partition member has a bifurcated partition portion and two branch side portions connected to a back plate or a bottom plate of the duct, and the distance between the two branch side portions is the back side. The pneumatic duct of the spinning machine according to any one of claims 1 to 5, wherein the pneumatic duct is formed so as to increase as it approaches the face plate or the bottom plate.

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