CH711539A2

CH711539A2 - Suction duct for spinning machine.

Info

Publication number: CH711539A2
Application number: CH01259/16A
Authority: CH
Inventors: Yasuyuki Kawai
Original assignee: Toyota Jidoshokki Kk
Priority date: 2015-10-02
Filing date: 2016-09-26
Publication date: 2017-04-13
Also published as: CH711539B1; JP2017066572A; JP6558194B2; CN106811841A; CN106811841B

Abstract

The invention relates to a suction pipe for a spinning machine comprising tubular conduit elements (31). A suction air flow caused by a negative pressure flows within each conduit member (31) from a first end (32) to a second end (33) of the conduit member ( 31). Conduit members (31) are defined as a first conduit member (31) which is positioned on a downstream side and has a first end (32) in a longitudinal direction, and a second conduit member (31) Which is positioned on an upstream side and has a second end (33) in a longitudinal direction. The second end (33) of the second duct member (31) is mounted in the first end (32) of the first duct member (31), So that the duct elements (31) are assembled together. The suction duct includes an annular resilient sealing member (34) which is inserted between the inner circumferential surface of the first end (32) of the first duct member (31) and the outer circumferential surface of the second end ) Of the second duct element (31). The resilient sealing member (34) has a gradually narrowed insertion portion (34a) which tapers progressively in the direction of the suction air flow. The suction duct includes an annular resilient sealing member (34) which is inserted between the inner circumferential surface of the first end (32) of the first duct member (31) and the outer circumferential surface of the second end ) Of the second duct element (31). The resilient sealing member (34) has a gradually narrowed insertion portion (34a) which tapers progressively in the direction of the suction air flow. The suction duct includes an annular resilient sealing member (34) which is inserted between the inner circumferential surface of the first end (32) of the first duct member (31) and the outer circumferential surface of the second end ) Of the second duct element (31). The resilient sealing member (34) has a gradually narrowed insertion portion (34a) which tapers progressively in the direction of the suction air flow.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a suction duct for a spinning machine.

In a spinning machine, when any of the fiber bundles distributed by a drawing machine is broken, the broken fiber bundle is wrapped around the front lower rollers, which hinders successive splicing. Accordingly, some spinning machines have a pneumatic trap, which removes the broken fiber bundles by suction. For example, see Japanese Patent Laid-Open Publication 11-12862. The pneumatic trap comprises a pneumatic duct (suction duct) which extends in the longitudinal direction of the machine. The pneumatic conduit includes suction pipes that extend toward the front lower rollers.

[0003] The pneumatic conduit comprises tubular conduit elements. The adjacent conduit members are defined as a first conduit member which has a first end in the longitudinal direction and a second conduit member that has a second end in the longitudinal direction. The second end of the second conduit member is mounted in the first end of the first conduit member so that the conduit members are assembled together. For example, the downstream end of a conduit member on the upstream side is mounted in the upstream end of the conduit member positioned downstream. A negative pressure source applies the negative pressure inside the pneumatic conduit,

Fiber bundle concentrator devices are known which concentrate the bundles of pre-stretched fibers prior to a twisting process to obtain high quality yarns with reduced lint. For example, see Japanese Patent Laid-Open Publication 2005-171 476. The fiber bundle concentrator includes suction pipes the length of which corresponds to a plurality of spindles. The suction pipes each have suction holes in positions in which the fiber bundles pass. The suction pipes are connected to a tubular suction pipe with a plurality of connector tubes. The suction duct has a predetermined length which corresponds to several spindles. The suction duct of the fiber bundle concentrator has a plurality of tubular conduit members such as the pneumatic duct of the pneumatic trap described above. The adjacent conduit members are defined as a first conduit member that has a first end in the longitudinal direction and a second conduit member that has a second end in the longitudinal direction. The second end of the second conduit member is mounted in the first end of the first conduit member so that the conduit members are assembled together. A negative pressure source applies the negative pressure to the inside of the suction pipe.

In the suction duct of the spinner described above, adjacent duct members are assembled by mounting the second end of the second duct member in the first end of the first duct member. Thus, there is a gap between the inner circumferential surface of the first end of the first conduit member and the outer circumferential surface of the second end of the second conduit member. Air can flow into the suction duct through the space.

Also, a conduit member can be pulled by the negative pressure acting within the suction conduit such that the relative positions in the longitudinal direction of the conduit members can be moved relative to the predetermined relative positions . In order to determine the relative positions in the longitudinal direction of the adjacent conduit members, the joint portions of the conduit members may be interconnected. However, if they are interconnected, the adjacent conduit elements can not be disassembled when necessary. SUMMARY OF THE INVENTION [0007] Accordingly, it is an object of the present invention to provide a suction conduit for a spinning machine,

In order to achieve the above object and according to one aspect of the present invention there is provided a suction conduit for a spinning machine comprising a plurality of tubular conduit members. The suction duct is configured such that a suction air flow caused by a negative pressure flows within each duct member from a first end to a second end of the duct member Of conduit. Conducting conduit members are defined as a first conduit member which is positioned on a downstream side and has a first end in a longitudinal direction and a second conduit member which is positioned on an upstream side and has Second end in a longitudinal direction. The second end of the second conduit member is mounted in the first end of the first conduit member so that the conduit members are assembled together. The suction duct comprises an annular elastic sealing member which is inserted between an inner circumferential surface of the first end of the first duct member and an outer circumferential surface of the second end of the second duct member. The resilient sealing member includes a gradually narrowed insertion portion which tapers progressively in a direction of the suction air flow. The suction duct comprises an annular elastic sealing member which is inserted between an inner circumferential surface of the first end of the first duct member and an outer circumferential surface of the second end of the second duct member. The resilient sealing member includes a gradually narrowed insertion portion which tapers progressively in a direction of the suction air flow. The suction duct comprises an annular elastic sealing member which is inserted between an inner circumferential surface of the first end of the first duct member and an outer circumferential surface of the second end of the second duct member. The resilient sealing member includes a gradually narrowed insertion portion which tapers progressively in a direction of the suction air flow.

Other aspects and advantages of the present invention will emerge more clearly from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention, in conjunction with its objects and advantages, will become more clearly apparent with reference to the following description of the presently preferred embodiments together with the accompanying drawings, in which: FIG. 1A is a diagram partly showing a fiber bundle concentrator according to one embodiment; FIG. 1B is a partially perspective view of the suction pipe; FIG. 2 is a schematic perspective view showing the fiber bundle concentrator; FIG. 3 is a sectional view showing the joint portions of the conduit members; FIG. 4A is a sectional view of an elastic sealing member; FIG. 4B is a sectional view showing the first end of a conduit member; FIG. 5 is an enlarged cross-sectional side view showing the joint portions of the conduit members according to another embodiment; And FIG. 6 is an enlarged cross-sectional side view showing the joint portions of the conduit members according to another embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0011] A suction pipe for a spinning machine according to one embodiment is now described with reference to FIGS. 1 to 4B. The suction duct is used in a fiber bundle concentration device 10.

[0012] As shown in FIG. 1A the fiber bundle concentrator 10 is positioned on the downstream side of a pair of final delivery rollers 12 of a drawing machine 11 in a direction of flow of the fiber bundles F. The device Of fiber bundle concentration 10 comprises distribution portions 13, suction pipes 14, air-permeable conveyor belts 15 and guide portions 16. Each dispensing portion 13 is configured by a lower nip roller 13a And an upper pinch roller 13b. The lower pinch roller 13a is arranged parallel to a front lower roller 12a of the pair of final delivery rollers 12. The upper nip roll 13b is compressed against the lower nip roll 13a with the air-permeable conveyor belt 15 therebetween. Like the upper front rollers 12b of the final delivery roller pairs 12, the upper roller rollers 13b are supported by load arms (not shown) with support members 17 at the other spindles.

The suction pipes 14 are positioned on the upstream side in the direction of flow of the fiber bundles F with respect to the pinch points of the lower nip rollers 13a and the upper nip rollers 13b. The air-permeable conveyor belts 15 are made, for example, with woven fabric so that the adequate air permeability is ensured. The air-permeable conveyor belts 15 are wound on the suction pipes 14, the guide portions 16 and the lower nip rollers 13a and driven in rotation to convey the fiber bundles F.

The suction pipes 14, the guide portions 16 and the lower nip roll 13a have predetermined lengths corresponding to a plurality of spindles (eg, eight spindles). The distal ends of the suction nozzles 18 of a single-type pneumatic trap are positioned below and proximate to the guide portions 16. The suction nozzles 18 suck the bundles of F-fibers dispensed by the stretching machine 11 when the fiber bundles F are broken. The proximal ends of the suction nozzles 18 are connected to a pneumatic duct (not shown) which extends in the longitudinal direction of the machine and is used in common by all the spindles.

[0015] As shown in FIG. 1B, each suction pipe 14 has a guide surface 14 which is curved to bulge outwardly. The guide surface 14a has suction holes 14b which extend in a direction intersecting the longitudinal direction of the suction pipe 14. The suction holes 14b are arranged at a predetermined pitch in the longitudinal direction of the suction pipe Or spindle pitch of the spinner. The suction pipes 14 are installed in the fiber bundle concentrator 10 with the guide surfaces 14a which face the paths of the fiber bundles F. A portion of each air-permeable conveyor belt 15 is wound on The corresponding guide surface 14a.

[0016] As shown in FIG. 2 the fiber bundle concentrator 10 has a plurality of intermediate ducts 19. The intermediate ducts 19 are arranged side by side in the longitudinal direction of the machine. The suction pipes 14 are arranged on both sides of the intermediate ducts 19 in a direction perpendicular to the longitudinal direction of the machine. The suction pipes 14 are arranged side by side in the longitudinal direction of the machine. Each suction pipe 14 is connected to the corresponding intermediate conduit 19 with two connector tubes 20. Each intermediate conduit 19 has a length which corresponds to twenty-four spindles on each side and forty-eight spindles on both sides. So,

[0017] The fiber bundle concentrator device 10 has a cylindrical suction duct 30 which extends in the longitudinal direction of the machine. The suction conduit 30 includes a plurality of cylindrical plastic conduit members 31. The adjacent conduit members 31 are assembled together. Each conduit member 31 has a length corresponding to the length of each intermediate conduit 19. Each conduit member 31 is connected to the corresponding intermediate conduits 19 with two connector tubes 21. A negative pressure source 22 is assembled to one end of the conduit As a negative pressure source 22, a fan motor is used, for example, in which a fan is driven by a motor.

When the spinning machine is activated, the fiber bundles F are stretched by the drawing machine 11 and then guided towards the fiber bundle concentrator 10 from the final distribution roll pairs 12. The bundles Lower rollers 13a and upper rollers 13b are rotated at a speed substantially equivalent to the surface speed of the final distribution roller pairs 12. The fiber bundles F pass through the pinch points (distribution nip points ) Of the lower pinch rollers 13a and upper pinch rollers 13b while being held in an appropriate tension. Then, after the directions have been changed, the fiber bundles F move downstream while being twisted.

The negative pressure in the suction duct 30 generates the suction which reaches the suction pipes 14 via the connector tubes 21, the intermediate ducts 19 and the connector tubes 20, Suction air is generated at the suction holes 14h. The suction air flow acts on the fiber bundles F through the air-permeable conveyor belt 15. The fiber bundles F are displaced while being concentrated in the position corresponding to the suction holes 14b suction. Thus, with respect to a spinning machine which is not equipped with the fiber bundling device 10, the lint is removed and the quality of the yarn is improved.

The seal portions of the adjacent duct members 31 in the suction duct 30 are now described.

[0021] As shown in FIG. 3, the first end 32 of each conduit member 31 has a larger diameter than the second end 33. The inner diameter of the first end 32 is larger than the outer diameter of the second end 33. The inner circumferential surface of the First end 32 has a flared portion 32a, the diameter of which increases toward the opening of first end 32. Of two adjacent conduit members 31, conduit members 31 on the downstream side are defined as first conduit members 31 And the upstream side conduit members 31 are defined as second conduit members 31.

The suction duct 30 comprises annular elastic sealing members 34 each of which is inserted between the inner circumferential surface of the first end 32 of a first duct member 31 and the outer circumferential surface of the second end 33 of a second conduit member 31. The resilient sealing member 34 has a gradually narrowed insertion portion 34a which tapers progressively in the direction of the suction air flow (the direction indicated by the arrow XI in Figure 3). The elastic sealing element 34 is made, for example, from rubber or elastomer. The resilient sealing member 34 is attached to the outer circumferential surface of the second end 33 of the second conduit members 31,

The resilient sealing member 34 has a stiffening reinforcing portion 34b which is continuous with the gradually narrowed insertion portion 34a and has a greater thickness than the gradually narrowed insertion portion 34a. The thickness of the stiffening reinforcing portion 34b is constant in the axial direction of the resilient sealing member 34. The length L1 of the stiffening reinforcing portion 34b in the axial direction of the resilient sealing member 34 is longer than the length L2 of the gradually narrowed insertion portion 34a in the axial direction of the elastic sealing member 34. In addition, the resilient sealing member 34 has an annular step portion 34c Between the gradually narrowed insertion portion 34a and the stiffening reinforcing portion 34b.

[0024] FIG. 4A illustrates a natural state of the resilient sealing member 34 wherein the gradually narrowed insertion portion 34a is yet to be inserted between the inner circumferential surface of the first end 32 of the first conduit member 31 and the outer circumferential surface Of the second end 33 of the second duct member 31. In the natural state, the inclination angle 81 of the gradually narrowed insertion portion 34a is larger than the inclination angle 92 of the flared portion 32a , As shown in FIGS. 4A and 4B.

[0025] The operation of the first embodiment is now described.

[0026] As shown in FIG. 3, the second end 33 of the second conduit member 31, to which the resilient sealing member 34 is fixed in advance, is mounted in the first end 32 of the first conduit member 31. Thereafter, the reinforcing portion Of stiffness 34b is compressed so that the gradually narrowed insertion portion 34a is deeply inserted between the inner circumferential surface of the first end 32 of the first duct member 31 and the outer circumferential surface of the second end 33 of the second duct member 31. As a result, the outer circumferential surface of the gradually narrowed insertion portion 34a and the circumferential surface of the first end 32 of the first conduit member 31 are brought into immediate contact,

The direction of the suction air flow generated by the negative pressure is also directed from the first end 32 to the second end 33 of each duct element 31. Thus, The suction air acts to suck the second duct member 31 into the first duct member 31. At this time the wedge effect is caused by the gradually narrowed insertion portion 34a which is compressed between the circumferential surface Of the first end 32 of the first duct member 31 and the outer circumferential surface of the second end 33 of the second duct member 31. The wedge effect prevents the second duct member 31 from being further pulled into the first member Of conduit 31.This determines the relative positions in the longitudinal direction of the adjacent first and second conduit members 31.

When the adjacent first and second conduit members 31 are to be disassembled, the stiffening reinforcing portion 34b is manipulated to remove the gradually narrowed insertion portion 34a from the inner circumferential surface of the first end 32 of the first Conduit member 31 and the outer circumferential surface of the second end 33 of the second conduit member 31. The elastic sealing member 34 is thus removed. Thus, the adjacent conduit elements 31 are easily disassembled.

[0029] The embodiment described above achieves the following advantages.

The suction duct 30 comprises annular elastic sealing elements 34, each of which is inserted between the inner circumferential surface of the first end 32 of a first duct element 31 and the outer circumferential surface of The second end 33 of a second conduit member 31. The resilient sealing member 34 has a gradually narrowed insertion portion 34a which tapers progressively in the direction of the suction air flow. Therefore, since the gradually narrowed insertion portion 34a is inserted between the inner circumferential surface of the first end 32 of the first conduit member 31 and the outer circumferential surface of the second end 33 of the second conduit member 31,

Also, the wedge effect is caused by the gradually narrowed insertion portion 34a which is compressed between the inner circumferential surface of the first end 32 of the first conduit member 31 and the outer circumferential surface of the second end 33 Of the second duct member 31. The wedge effect prevents the second duct member 31 from being further pulled into the first duct member 31. This determines the relative position in the longitudinal direction of the adjacent duct members 31.

Consequently the relative positions in the longitudinal direction of the adjacent first and second duct elements 31 are determined without bonding the joint portions of the adjacent first and second duct elements 31 while limiting the air inlet into The space between the inner circumferential surface of the first end 32 of the first conduit member 31 and the outer circumferential surface of the second end 33 of the second conduit member 31.

(2) In the natural state of the resilient sealing member 34, the gradually narrowed insertion portion 34a must still be inserted between the inner circumferential surface of the first end 32 of the first conduit member 31 and The outer circumferential surface of the second end 33 of the second conduit member 31. Also in the natural state the inclination angle 91 of the gradually narrowed insertion portion 34a is greater than the inclination angle 82 Of the flared portion 32a. In some cases the inner circumferential surface of the first end 32 of the conduit member 31 has a flared portion 32a whose diameter increases toward the opening of the first end 32. Even in such a case,

The elastic sealing member 34 has a stiffening reinforcing portion 34b which is continuous with the gradually narrowed insertion portion 34a and has a greater thickness than the gradually narrowed insertion portion 34a. For example, it is assumed that a portion of the resilient sealing member 34 which is continuous with the gradually narrowed insertion portion 34a has a thickness less than that of the gradually narrowed insertion portion 34a.

In this case even if the part of the elastic sealing member 34 which is continuous with the gradually narrowed insertion portion 34a is compressed to insert the gradually narrowed insertion portion 34a between the inner circumferential surface of The first end 32 of a conduit member 31 and the outer circumferential surface of the second end 33 of the other conduit member 31, the portion of the resilient sealing member 34 being continuous with the insert portion Gradually narrowed 34a, is likely to bend. So,

In this regard, the resilient sealing member 34 is configured to have the stiffening reinforcing portion 34b so that the stiffening reinforcing portion 34b does not bend easily even if the stiffening reinforcing portion 34b is compressed when the gradually narrowed insertion portion 34a is inserted between the inner circumferential surface of the first end 32 of the first duct member 31 and the outer circumferential surface of the second end 33 of the second duct member 31. Thus, Inserted portion 34a is easily inserted between the inner circumferential surface of the first end 32 of the first duct member 31 and the outer circumferential surface of the second end 33 of the second duct member 31.

[0037] The elastic sealing member 34 has the step portion 34c between the tapered insertion portion 34a and the stiffening reinforcing portion 34b. With this configuration, when the suction due to the suction air flow acts on the resilient sealing member 34 to pull the resilient sealing member 34, the step portion 34c is in contact with the edge Open from the first end 32 of the first conduit member 31. Thus, the elastic sealing member 34 is not pulled further. This prevents relative positions in the longitudinal direction of the adjacent first and second conduit members 31 from being moved relative to each other.

(5) When suction due to the suction air flow acts on the resilient sealing member 34 so that the resilient sealing member 34 is pulled, the step portion 34c is In contact with the open end of the first end 32 of the first conduit member 31. At that time the space between the step portion 34c and the open edge of the first end 32 of the first conduit member 31 Is sealed. This further limits the entry of air into the space between the inner circumferential surface of the first end 32 of the first conduit member 31 and the outer circumferential surface of the second end 33 of the second conduit member 31.

When the gradually narrowed insertion portion 34a is inserted between the inner circumferential surface of the first end 32 of the first duct member 31 and the outer circumferential surface of the second end 33 of the second duct member 31, There may remain a gap between the outer circumferential surface of the gradually narrowed insertion portion 34a and the inner circumferential surface of the first end 32 of the first conduit member 31. Even in such a case, the resilient sealing member 34 Receives the suction due to the suction air flow,So that the gradually narrowed insertion portion 34a is compressed between the inner circumferential surface of the first end 32 of the first duct member 31 and the outer circumferential surface of the second end 33 of the second duct member 31.

Thus, the outer circumferential surface of the gradually narrowed insertion portion 34a and the inner circumferential surface of the first end 32 of the first conduit member 31 are brought into immediate contact so that the gradually narrowed insertion portion 34a seals between the inner circumferential surface of the first end 32 of the first conduit member 31 and the outer circumferential surface of the second end 33 of the second conduit member 31.

The length L1 of the stiffening reinforcing portion 34b in the axial direction of the resilient sealing member 34 is longer than the length L2 of the gradually narrowed insertion portion 34a in the axial direction Of the elastic sealing member 34. With this configuration, the stiffening reinforcing portion 34b has a stiffness greater than that of the case where the length L1 of the stiffening reinforcing portion 34b in the axial direction of the member Is shorter than the length L2 of the gradually narrowed insertion portion 34a in the axial direction of the resilient sealing member 34. Therefore,The stiffening reinforcing portion 34b does not bend easily even if the stiffening reinforcing portion 34b is compressed when the gradually narrowed insertion portion 34a is inserted between the inner circumferential surface of the first end 32 of the first duct member 31 And the outer circumferential surface of the second end 33 of the second conduit member 31.

When the conduit members 31 are to be disassembled, the stiffening reinforcing portion 34b is manipulated to remove the gradually narrowed insertion portion 34a from the inner circumferential surface of the first end 32 of the first member And the outer circumferential surface of the second end 33 of the second conduit member 31. The elastic sealing member 34 is thus removed. The conduit members 31 can be easily disassembled. Also, the configuration makes it easy to add an additional conduit member 31.

The embodiment described above can be modified in the following manner.

As shown in FIG. The resilient sealing member 34 may have a plurality of annular grooves 34d in the surface which is maintained in immediate contact with the conduit member 31. The inner circumferential surface of the resilient sealing member 34 is configured To be kept in immediate contact with the outer circumferential surface of the second end 33 of the second conduit member 31. The annular grooves 34d are provided in the inner circumferential surface of the resilient sealing member 34 to be arranged in the axial direction Of the resilient sealing member 34. The annular grooves 34d, which serve as a labyrinth seal,

Also, even if the elastic sealing member 34 degrades, so that immediate contact with the second end of the second conduit member 31 is reduced, the annular grooves 34d, which serve as a labyrinth seal, The sealing property between the inner circumferential surface of the resilient sealing member 34 and the outer circumferential surface of the second end 33 of the second conduit member 31.

[0046] In the embodiment illustrated in FIG. 5, the gradually narrowed insertion portion 34a may have a plurality of annular grooves 34d in the outer circumferential surface. The outer circumferential surface of the gradually narrowed insertion portion 34a is configured to be kept in immediate contact with the inner circumferential surface of the first end 32 of the first conduit member 31. The annular grooves 34d serving as a labyrinth seal, Make it easier to limit the entry of air into the space between the internal circumferential surface of the first end 32 of the first duct element 31 and the outer circumferential surface of the second end 33 of the second duct element 31.

In the embodiment illustrated above, the gradually narrowed insertion portion 34a may have a plurality of annular grooves 34d in the outer circumferential surface.

As shown in FIG. 6, the elastic sealing member 34 need not necessarily have the step portion 34c between the gradually narrowed insertion portion 34a and the stiffening reinforcing portion 34b. That is, the gradually narrowed insertion portion 34a may be directly continuous with the stiffening reinforcing portion 34b.

In the embodiment illustrated above, the resilient sealing member 34 need not necessarily have the stiffening reinforcing portion 34b. That is, the resilient sealing member 34 may be entirely formed by the gradually narrowed insertion portion 34a.

In the embodiment illustrated above, the angle of inclination 91 of the progressively narrowed insertion portion 34a may be equal to the angle of inclination 92 of the flared portion 32a.

In the embodiment illustrated above, the length L1 of the stiffening reinforcing portion 34b in the axial direction of the resilient sealing member 34 may be equal to the length L2 of the insertion portion Progressively narrowed 34a in the axial direction of the resilient sealing member 34.

In the embodiment illustrated above, the inner circumferential surface of the first end 32 of the conduit member 31 need not necessarily be formed in the flared portion 32a which extends toward The opening of the first end 32. That is, the inner circumferential surface may extend linearly in the axial direction of the conduit member 31.

In the above embodiment, the duct elements 31 have a length which corresponds to the intermediate ducts 19. However, the length of the duct elements 31 can be modified if necessary.

In the embodiment illustrated above, the suction duct 30 may have a rectangular transverse shape. That is, the suction conduit 30 may have any cross-sectional shape as long as it is tubular.

In the embodiment illustrated above, the duct elements 31 may be made of metal. That is, the material of the conduit members 31 is not particularly limited.

In the embodiment illustrated above, the negative pressure source 22 may be, for example, a vacuum pump.

In the embodiment illustrated above, the suction duct of the spinning machine can be applied to a pneumatic duct of a pneumatic trap. In this case the gradually narrowed insertion portion 34a of the resilient sealing member 34 may be inserted between the inner circumferential surface of the first end of a first

Claims

And the outer circumferential surface of the second end of a second duct member of the air duct. Therefore, the present examples and embodiments are to be taken as illustrative and not restrictive and the invention is not limited to the details given herein but may be modified within the scope and scope of the invention, Equivalence of the appended claims. claims

1. Suction duct for a spinning machine comprising a plurality of tubular conduit members (31), wherein: the suction duct is configured such that a suction air flow caused by a pressure (31) from a first end (32) to a second end (33) of the conduit member (31), conduit members (31) Are defined as a first conduit member (31) which is positioned on a downstream side and has a first end (32) in a longitudinal direction, and a second conduit member (31) which is positioned on a side And has a second end (33) in a longitudinal direction,The second end (33) of the second duct member (31) is mounted in the first end (32) of the first duct member (31) so that the duct members (31) are assembled together, Characterized in that an annular elastic sealing member (34) is inserted between an inner circumferential surface of the first end (32) of the first duct member (31) and an outer circumferential surface of the second end ) Of the second duct member (31), and the resilient sealing member (34) comprises a gradually narrowed insertion portion (34a) of which a section gradually decreases in a direction of the suction air flow.The suction duct being characterized in that an annular elastic sealing member (34) is inserted between an inner circumferential surface of the first end (32) of the first duct member (31) and an outer circumferential surface of the duct And the elastic sealing element (34) comprises a gradually narrowed insertion part (34a), a section of which gradually decreases in a direction of the air flow of the second part suction.The suction duct being characterized in that an annular elastic sealing member (34) is inserted between an inner circumferential surface of the first end (32) of the first duct member (31) and an outer circumferential surface of the duct And the elastic sealing element (34) comprises a gradually narrowed insertion part (34a), a section of which gradually decreases in a direction of the air flow of the second part suction.And the resilient sealing member (34) comprises a gradually narrowed insertion portion (34a) of which a section decreases progressively in a direction of the suction air flow.And the resilient sealing member (34) comprises a gradually narrowed insertion portion (34a) of which a section decreases progressively in a direction of the suction air flow.

2. A suction pipe for a spinning machine as claimed in claim 1, wherein: the inner circumferential surface of the first end (32) of each conduit member (31) has a flared portion (32a) To an opening of the first end (32) and, in a natural state of the resilient sealing member (34), wherein the gradually narrowed insertion portion (34a) is yet to be inserted between the inner circumferential surface Of the first end (32) of the first duct member (31) and the outer circumferential surface of the second end (33) of the second duct member (31), and an inclination angle (01) (34a) is greater than an angle of inclination (02) of the flared portion (32a).

3. A suction pipe for a spinning machine according to claim 1 or 2, wherein the elastic sealing member (34) has a stiffening reinforcing portion (34b) which is continuous with the gradually inserting portion (34a) and has a greater thickness than the gradually narrowed insertion portion (34a).

4. A suction pipe for a spinning machine as claimed in claim 3, wherein the resilient sealing member (34) has a step portion (34c) between the gradually narrowed insertion portion (34a) and Stiffening reinforcing portion (34b).

A suction pipe for a spinning machine according to any one of claims 1 to 4, wherein the resilient sealing member (34) has a plurality of annular grooves (34d) in a surface which is held in Immediate contact with the conduit member (31).