JP2024103229A - Fiber bundle concentrating device for spinning machine - Google Patents

Abstract

[Problem] To provide a fiber bundle concentrating device for a spinning machine capable of suppressing clogging of suction holes and suction slits while suppressing deterioration of yarn quality. [Solution] The fiber bundle concentrating device includes a suction pipe 13 provided downstream of a draft device in a fiber bundle moving direction X, and a guide member 16 attached to the suction pipe 13 to guide the movement of a ventilation apron. The suction pipe 13 has a suction hole 35 extending at an angle with respect to a direction perpendicular to the extension direction of the suction pipe 13. The guide member 16 has a suction slit 64 extending to overlap with the suction hole 35. The widths W80a and W80b of a step 80 between a hole edge 50 and a slit edge 70 on the upstream side of the intersection Q in the fiber bundle moving direction X are larger than the width of the step between the hole edge 50 and the slit edge 70 on the downstream side of the intersection Q, with the boundary being an intersection Q between a straight line L passing through an upstream end point 350 of the suction hole 35 and perpendicular to the extension direction of the suction pipe 13 and a hole edge 50. [Selected figure] Figure 5

Description

The present invention relates to a fiber bundle concentrating device for a spinning machine.

The fiber bundling device of the spinning machine bundles the fiber bundles drafted by the draft device. The fiber bundling device of the spinning machine includes a suction pipe, a ventilation apron, and a guide member. The suction pipe is provided downstream of the draft device in the moving direction of the fiber bundle. The suction pipe has a suction hole that extends at an angle to a direction perpendicular to the extending direction of the suction pipe. The ventilation apron is wrapped around the suction pipe. The ventilation apron transports the fiber bundle. The guide member is attached to the suction pipe in correspondence with the wrapping position of the ventilation apron with respect to the suction pipe. The guide member guides the movement of the ventilation apron. The guide member has a suction slit that extends to overlap with the suction hole.

In the fiber gathering device of such a spinning machine, fibers can get caught in the gap between the suction pipe and the guide member where the suction hole and suction slit overlap. As more fibers adhere to the caught fiber, the caught fiber grows larger like a snowball. If the larger fiber blocks the suction hole and suction slit, the suction hole and suction slit become clogged. Clogging of the suction hole and suction slit leads to a deterioration in the quality of the yarn.

In Patent Document 1, the hole width of the suction hole and the slit width of the suction slit are made different to provide a step between the hole edge, which is the edge of the suction hole, and the slit edge, which is the edge of the suction slit. In this case, the gap between the suction pipe and the guide member is separated from the path through which the fiber bundle passes by the amount of the step, making it difficult for the fibers to get caught in the gap. As a result, clogging of the suction hole and the suction slit is suppressed.

It is known that the downstream area of the suction hole and suction slit in the direction of fiber bundle movement is easily affected by the quality of the yarn. For this reason, if there is a step between the hole edge and the slit edge in the downstream area of the suction hole and suction slit in the direction of fiber bundle movement, there is a risk of the quality of the yarn being reduced. Therefore, in the downstream area of the suction hole and suction slit in the direction of fiber bundle movement, the hole width of the suction hole and the slit width of the suction slit are made the same to prevent a step from occurring between the hole edge and the slit edge.

JP 2022-125394 A

It is believed that the greater the difference in width between the hole edge and the slit edge, the more the clogging of the suction hole and suction slit is suppressed. However, it has been found that if the difference in width is too large, the quality of the yarn deteriorates in the downstream areas of the suction hole and suction slit, even if no difference in width between the hole edge and the slit edge is created.

Patent Document 1 also describes that it is not necessary to provide a step downstream of the center of the suction hole and suction slit in the direction of fiber bundle movement. However, there is no suggestion as to the relationship between the range of the step and the quality of the yarn.

The fiber bundle concentrating device of the spinning machine for solving the above problems comprises a suction pipe provided downstream of the drafting device in the moving direction of the fiber bundle, and a guide member attached to the suction pipe corresponding to the winding position of the ventilation apron wrapped around the suction pipe, which guides the movement of the ventilation apron, the suction pipe having a suction hole extending at an angle with respect to a direction perpendicular to the extending direction of the suction pipe, and the guide member having a suction slit extending to overlap with the suction hole, and the gist of the fiber bundle concentrating device is that the width of the step between the hole edge portion and the slit edge portion, which is the edge of the suction slit, on the upstream side of the intersection point in the moving direction of the fiber bundle and the suction hole edge portion, which is the edge of the suction hole, is larger than the width of the step between the hole edge portion and the slit edge portion, which is the edge of the suction slit, on the downstream side of the intersection point.

Upstream of the intersection in the fiber bundle movement direction, the fiber bundle passes through a position away from the hole edge and slit edge, whereas downstream of the intersection, the fiber bundle is focused by moving along the hole edge and slit edge. For this reason, the area downstream of the intersection in the fiber bundle movement direction is more likely to affect the focusing of the fiber bundle, and therefore the yarn quality, than the area upstream of the intersection. It is also known that clogging of the suction holes and suction slits is more likely to occur in the area upstream of the intersection in the fiber bundle movement direction.

According to the above configuration, the width of the step between the hole edge and the slit edge upstream of the intersection in the moving direction of the fiber bundle is larger than the width of the step between the hole edge and the slit edge downstream of the intersection. In this way, clogging can be suppressed by making the step width larger upstream of the intersection, which is an area where clogging is likely to occur and is unlikely to affect the quality of the yarn, than on the downstream side. On the other hand, degradation of the yarn quality can be suppressed by making the step width smaller downstream of the intersection, which is an area that is likely to affect the quality of the yarn, than on the upstream side. Therefore, clogging of the suction hole and suction slit can be suppressed while suppressing degradation of the quality of the yarn.

In the fiber bundle collecting device of the spinning machine, a width of a step between the hole edge portion and the slit edge portion on a downstream side of the intersection point in the moving direction of the fiber bundle may be zero.
According to the above configuration, deterioration of yarn quality can be further suppressed compared to a case where a step is provided between the hole edge and the slit edge also downstream of the intersection in the moving direction of the fiber bundle.

In the fiber bundle collecting device of the spinning machine, the hole edge portion includes a first hole edge portion that intersects with the straight line and a second hole edge portion that is located on the opposite side of the first hole edge portion, and the width of the step between the first hole edge portion and the slit edge portion upstream of the intersection point in the moving direction of the fiber bundle may be smaller than the width of the step between the second hole edge portion and the slit edge portion upstream of the intersection point in the moving direction of the fiber bundle.

Upstream of the intersection in the fiber bundle's moving direction, the fiber bundle passes closer to the first hole edge than to the second hole edge. For this reason, the step between the first hole edge and the slit edge is more likely to affect the yarn quality than the step between the second hole edge and the slit edge. Therefore, by making the width of the step between the first hole edge and the slit edge smaller than the width of the step between the second hole edge and the slit edge, the deterioration of the yarn quality can be further suppressed.

The present invention makes it possible to prevent the deterioration of yarn quality while suppressing clogging of suction holes and suction slits.

FIG. FIG. 2 is a perspective view showing a suction pipe and a guide member in the first embodiment. FIG. 2 is a partial front view showing a suction pipe in the first embodiment. FIG. 4 is a front view showing a guide member in the first embodiment. FIG. 2 is a partial front view showing a suction pipe and a guide member in the first embodiment. 6 is a cross-sectional view taken along line 6-6 in FIG. 5, showing the suction pipe and the guide member in the first embodiment. 7 is a cross-sectional view taken along line 7-7 in FIG. 5, showing a suction pipe and a guide member in the first embodiment. FIG. 10 is a partial front view showing a suction pipe and a guide member in a second embodiment. 9 is a cross-sectional view taken along line 9-9 in FIG. 8, showing a suction pipe and a guide member in a second embodiment. FIG. 13 is a front view showing a suction pipe and a guide member in a third embodiment. FIG. 10 is a partial front view showing a suction pipe and a guide member in a modified example. 12 is a cross-sectional view taken along line AA in FIG. 11 , showing a suction pipe and a guide member in a modified example.

[First embodiment]
A first embodiment of a fiber bundle bundling device for a spinning machine will be described below with reference to Figures 1 to 7. Note that, hereinafter, the "fiber bundle bundling device for a spinning machine" will be simply referred to as the "fiber bundle bundling device".

As shown in FIG. 1, the spinning machine 100 includes a draft device 110 and a fiber bundle concentrating device 10. The draft device 110 drafts the fiber bundle F. The fiber bundle concentrating device 10 is provided downstream of the draft device 110 in the moving direction X of the fiber bundle F. The fiber bundle concentrating device 10 pre-concentrates the drafted fiber bundle F before twisting.

The draft device 110 is equipped with a final delivery roller pair 111. The final delivery roller pair 111 is the roller pair located most downstream in the moving direction X of the fiber bundle F among the roller pairs of the draft device 110. The final delivery roller pair 111 has a front bottom roller 112 and a front top roller 113. The front top roller 113 is supported by a support member 114.

<Fiber bundle concentrating device>
The fiber bundle concentrating device 10 includes a rotating shaft 11 , a pair of nip rollers 12 , a suction pipe 13 , a guide portion 14 , a ventilation apron 15 , and a guide member 16 .

The rotating shaft 11 is arranged to extend parallel to the front bottom roller 112. The rotating shaft 11 is provided with a gear portion (not shown). An intermediate gear 17 meshes with the gear portion of the rotating shaft 11. The intermediate gear 17 meshes with a gear portion 112a provided on the front bottom roller 112. The rotational force of the front bottom roller 112 is transmitted to the rotating shaft 11 via the intermediate gear 17, causing the rotating shaft 11 to rotate.

The nip roller pair 12 has a bottom nip roller 21 and a top nip roller 22. The bottom nip roller 21 is provided on the rotating shaft 11. When the rotating shaft 11 rotates, the bottom nip roller 21 rotates integrally with the rotating shaft 11. A ventilation apron 15 is wrapped around the bottom nip roller 21. The top nip roller 22 is supported by a weighting arm (not shown) via a support member 114. The bottom nip roller 21 and the top nip roller 22 rotate at approximately the same speed as the final delivery roller pair 111.

The fiber bundle F sent out from the final delivery roller pair 111 of the draft device 110 passes between the bottom nip roller 21 and the top nip roller 22 together with the ventilation apron 15. The top nip roller 22 is pressed by the bottom nip roller 21 through the ventilation apron 15. As a result, the fiber bundle F and the ventilation apron 15 are nipped by the nip roller pair 12. The position where the ventilation apron 15 and the fiber bundle F are nipped by the nip roller pair 12 is called the nip position P.

<Suction pipe>
The suction pipe 13 is cylindrical. The suction pipe 13 is formed, for example, by extrusion molding of aluminum. The suction pipe 13 is disposed downstream of the final delivery roller pair 111 and upstream of the nip position P in the moving direction X of the fiber bundle F. The extending direction of the suction pipe 13 coincides with the axial direction of the rotating shaft 11. The suction pipe 13 is connected to a suction source (not shown).

As shown in FIG. 2, the suction pipe 13 has a first pipe component 31, a second pipe component 32, and a third pipe component 33. The first pipe component 31 is curved so as to bulge outward. The second pipe component 32 is continuous with the upstream end of the first pipe component 31 in the moving direction X of the fiber bundle F. The second pipe component 32 is curved so as to be concave inward. The third pipe component 33 is continuous with the downstream end of the first pipe component 31 in the moving direction X of the fiber bundle F. The third pipe component 33 is curved so as to be concave inward.

The suction pipe 13 has a plurality of suction sections 34. The plurality of suction sections 34 are arranged at intervals in the extension direction of the suction pipe 13. In this embodiment, each suction section 34 is composed of a pair of suction holes 35. Each suction hole 35 penetrates the first pipe component 31. The pair of suction holes 35 are arranged at intervals in the extension direction of the suction pipe 13. In the following, when it is necessary to distinguish between the pair of suction holes 35, one suction hole 35 is referred to as the first suction hole 35a and the other suction hole 35 is referred to as the second suction hole 35b.

As shown in FIG. 3, the suction holes 35 extend at an angle relative to a direction perpendicular to the extension direction of the suction pipe 13. More specifically, the first suction hole 35a extends at an angle to the left side of the paper relative to a direction perpendicular to the extension direction of the suction pipe 13. The second suction hole 35b extends at an angle to the right side of the paper relative to a direction perpendicular to the extension direction of the suction pipe 13. The pair of suction holes 35 are arranged to approach each other from the upstream side to the downstream side of the movement direction X of the fiber bundle F.

The hole edge 50 , which is the edge of the suction hole 35 , has a first hole edge 51 , a second hole edge 52 , a third hole edge 53 , and a fourth hole edge 54 .
The first hole edge 51 and the second hole edge 52 extend in parallel. The first hole edge 51 and the second hole edge 52 extend linearly along the extension direction of the suction hole 35. The second hole edge 52 is located on the opposite side to the first hole edge 51. The distance between the first hole edge 51 and the second hole edge 52 is defined as the hole width W35 of the suction hole 35. The hole width W35 of the suction hole 35 is constant in the extension direction of the suction hole 35.

The pair of suction holes 35 are arranged so that the first hole edge 51 is located on the outside and the second hole edge 52 is located on the inside. Therefore, the distance between the pair of first hole edges 51 is wider than the distance between the pair of second hole edges 52.

The third hole edge 53 connects the upstream end of the first hole edge 51 and the upstream end of the second hole edge 52 in the moving direction X of the fiber bundle F. The third hole edge 53 extends in an arc shape. The fourth hole edge 54 connects the downstream end of the first hole edge 51 and the downstream end of the second hole edge 52 in the moving direction X of the fiber bundle F. The fourth hole edge 54 extends in a straight line.

The point located most upstream in the moving direction X of the fiber bundle F in the third hole edge portion 53 is defined as the upstream end point 350 of the suction hole 35. A straight line that passes through the upstream end point 350 of the suction hole 35 and extends in a direction perpendicular to the extension direction of the suction pipe 13 is defined as line L. Line L intersects with the first hole edge portion 51. The intersection point between line L and the first hole edge portion 51 is defined as intersection point Q.

As shown in FIG. 1, the ventilation apron 15 is an endless belt. The ventilation apron 15 is formed, for example, from a woven fabric having moderate breathability. The ventilation apron 15 is wrapped around the suction pipe 13, the guide portion 14, and the bottom nip roller 21. The ventilation apron 15 is wrapped around the suction pipe 13 in a position corresponding to the position where the suction portion 34 is provided on the suction pipe 13. Therefore, multiple ventilation aprons 15 are wrapped around the suction pipe 13. The multiple ventilation aprons 15 are arranged at intervals in the extension direction of the suction pipe 13. The ventilation aprons 15 rotate with the rotation of the bottom nip roller 21 to transport the fiber bundle F.

<Guide member>
As shown in Fig. 2, a plurality of guide members 16 are attached to the suction pipe 13. The plurality of guide members 16 are arranged at intervals in the extension direction of the suction pipe 13. Note that Fig. 2 illustrates one guide member 16 attached to the suction pipe 13 and one guide member 16 not attached to the suction pipe 13.

The guide member 16 is attached to the suction pipe 13 in a position corresponding to the position where the suction section 34 is provided on the suction pipe 13. As described above, the ventilation apron 15 is also wrapped around the suction pipe 13 in a position corresponding to the position where the suction section 34 is provided on the suction pipe 13. Therefore, the guide member 16 is attached to the suction pipe 13 in a position corresponding to the wrapping position of the ventilation apron 15 around the suction pipe 13. The guide member 16 is located between the suction pipe 13 and the ventilation apron 15. The guide member 16 guides the movement of the ventilation apron 15.

The guide member 16 has a guide portion 60, a first bent portion 61, and a second bent portion 62. The guide member 16 is formed, for example, by bending a thin metal plate.
The guide portion 60 is curved to follow the shape of the first pipe component 31 of the suction pipe 13. The guide portion 60 has a first surface 60a and a second surface 60b. The first surface 60a faces the outer peripheral surface 13a of the suction pipe 13. A gap S (see FIGS. 6 and 7) is provided between the first surface 60a of the guide portion 60 and the outer peripheral surface 13a of the suction pipe 13. The second surface 60b is the surface opposite to the first surface 60a. The ventilation apron 15 slides against the second surface 60b of the guide portion 60.

The first bent portion 61 is continuous from the upstream end of the guide portion 60 in the moving direction X of the fiber bundle F. The first bent portion 61 is bent so as to follow the shape of the connection portion between the first pipe component 31 and the second pipe component 32 of the suction pipe 13. The second bent portion 62 is continuous from the downstream end of the guide portion 60 in the moving direction X of the fiber bundle F. The second bent portion 62 is bent so as to follow the shape of the connection portion between the first pipe component 31 and the third pipe component 33 of the suction pipe 13.

The guide member 16 has a pair of suction slits 64. Each suction slit 64 penetrates the first pipe component 31. The pair of suction slits 64 are arranged at a distance from each other in the extension direction of the suction pipe 13. When it is necessary to distinguish between the pair of suction slits 64, one suction slit 64 is referred to as the first suction slit 64a and the other suction slit 64 is referred to as the second suction slit 64b.

As shown in Figures 4 and 5, the suction slits 64 extend at an angle relative to a direction perpendicular to the extension direction of the suction pipe 13. More specifically, the first suction slit 64a extends at an angle to the left side of the paper relative to a direction perpendicular to the extension direction of the suction pipe 13. The second suction slit 64b extends at an angle to the right side of the paper relative to a direction perpendicular to the extension direction of the suction pipe 13. The pair of suction slits 64 are arranged to approach each other from the upstream side to the downstream side of the movement direction X of the fiber bundle F.

The inclination angle of the first suction slit 64a with respect to the direction perpendicular to the extension direction of the suction pipe 13 is the same as the inclination angle of the first suction hole 35a with respect to the direction perpendicular to the extension direction of the suction pipe 13. The inclination angle of the second suction slit 64b with respect to the direction perpendicular to the extension direction of the suction pipe 13 is the same as the inclination angle of the second suction hole 35b with respect to the direction perpendicular to the extension direction of the suction pipe 13.

A slit edge portion 70 which is an edge portion of the suction slit 64 has a first slit edge portion 71 , a second slit edge portion 72 , a third slit edge portion 73 , and a fourth slit edge portion 74 .
The first slit edge portion 71 and the second slit edge portion 72 extend in the extension direction of the suction slit 64. The second slit edge portion 72 is located on the opposite side to the first slit edge portion 71. The pair of suction slits 64 are arranged such that the first slit edge portion 71 is located on the outer side and the second slit edge portion 72 is located on the inner side.

The first slit edge portion 71 has an upstream portion 71a, a downstream portion 71b, and a connecting portion 71c. The upstream portion 71a, the downstream portion 71b, and the connecting portion 71c each extend linearly. The upstream portion 71a extends along the extension direction of the suction slit 64. The downstream portion 71b is located downstream of the upstream portion 71a in the moving direction X of the fiber bundle F. The downstream portion 71b extends parallel to the upstream portion 71a. The downstream portion 71b extends along the extension direction of the suction slit 64. The connecting portion 71c connects the downstream end of the upstream portion 71a and the upstream end of the downstream portion 71b. The connecting portion 71c extends at an angle relative to the upstream portion 71a and the downstream portion 71b.

The second slit edge portion 72 has an upstream portion 72a, a downstream portion 72b, and a connecting portion 72c. The upstream portion 72a, the downstream portion 72b, and the connecting portion 72c each extend linearly. The upstream portion 72a extends along the extension direction of the suction slit 64. The downstream portion 72b is located downstream of the upstream portion 72a in the moving direction X of the fiber bundle F. The downstream portion 72b extends parallel to the upstream portion 72a. The downstream portion 72b extends along the extension direction of the suction slit 64. The connecting portion 72c connects the downstream end of the upstream portion 72a and the upstream end of the downstream portion 72b. The connecting portion 72c extends at an angle relative to the upstream portion 72a and the downstream portion 72b.

The upstream portion 71a of the first slit edge portion 71 and the upstream portion 72a of the second slit edge portion 72 face each other. The upstream portion 71a of the first slit edge portion 71 and the upstream portion 72a of the second slit edge portion 72 extend in parallel. The distance between the upstream portion 71a of the first slit edge portion 71 and the upstream portion 72a of the second slit edge portion 72 is the first slit width W641 of the suction slit 64. The first slit width W641 is different from the hole width W35 of the suction hole 35. In this embodiment, the first slit width W641 is larger than the hole width W35 of the suction hole 35.

The downstream portion 71b of the first slit edge portion 71 and the downstream portion 72b of the second slit edge portion 72 face each other. The downstream portion 71b of the first slit edge portion 71 and the downstream portion 72b of the second slit edge portion 72 extend in parallel. The distance between the downstream portion 71b of the first slit edge portion 71 and the downstream portion 72b of the second slit edge portion 72 is the second slit width W642 of the suction slit 64. The second slit width W642 is smaller than the first slit width W641. In this embodiment, the second slit width W642 is the same as the hole width W35 of the suction hole 35. Note that "the second slit width W642 is the same as the hole width W35" also includes the case where the second slit width W642 is different from the hole width W35 within the range of the manufacturing tolerance of the suction hole 35 and the suction slit 64.

The connection portion 71c of the first slit edge portion 71 and the connection portion 72c of the second slit edge portion 72 face each other. The distance between the connection portion 71c of the first slit edge portion 71 and the connection portion 72c of the second slit edge portion 72 gradually narrows from the upstream side to the downstream side in the moving direction X of the fiber bundle F. The distance between the connection portion 71c of the first slit edge portion 71 and the connection portion 72c of the second slit edge portion 72 is larger than the hole width W35 of the suction hole 35.

The third slit edge portion 73 connects the upstream end of the first slit edge portion 71 and the upstream end of the second slit edge portion 72 in the moving direction X of the fiber bundle F. The third slit edge portion 73 extends in an arc shape. In this embodiment, the radius of the virtual circle that constitutes the third slit edge portion 73 is larger than the radius of the virtual circle that constitutes the third hole edge portion 53. The fourth slit edge portion 74 connects the downstream end of the first slit edge portion 71 and the downstream end of the second slit edge portion 72 in the moving direction X of the fiber bundle F. The fourth slit edge portion 74 extends in a straight line.

<Relationship between suction hole and suction slit>
5, the pair of suction slits 64 extend along the pair of suction holes 35. More specifically, the first suction slit 64a extends along the first suction hole 35a. The second suction slit 64b extends along the second suction hole 35b. The suction slits 64 overlap the suction holes 35.

The connection portion between the downstream portion 71b and the connection portion 71c of the first slit edge portion 71 overlaps with the intersection point Q. The upstream portion 71a and the connection portion 71c of the first slit edge portion 71, the upstream portion 72a and the connection portion 72c of the second slit edge portion 72, and the third slit edge portion 73 are located upstream of the intersection point Q in the moving direction X of the fiber bundle F. The downstream portion 71b of the first slit edge portion 71, the downstream portion 72b of the second slit edge portion 72, and the fourth slit edge portion 74 are located downstream of the intersection point Q in the moving direction X of the fiber bundle F.

The shape of the hole edge 50 and the shape of the slit edge 70 are different upstream of the intersection Q in the moving direction X of the fiber bundle F. As described above, the first slit width W641 of the suction slit 64 is larger than the hole width W35 of the suction hole 35. Therefore, the upstream portion 71a and the connection portion 71c of the first slit edge 71 are located outside the first hole edge 51. The upstream portion 72a and the connection portion 72c of the second slit edge 72 are located outside the second hole edge 52. In addition, the radius of the virtual circle that constitutes the third slit edge 73 is larger than the radius of the virtual circle that constitutes the third hole edge 53. Therefore, the third slit edge 73 is located outside the third hole edge 53. In other words, upstream of the intersection Q in the moving direction X of the fiber bundle F, the slit edge 70 is located one size outside the hole edge 50.

As shown in Figures 5 and 6, upstream of the intersection Q in the moving direction X of the fiber bundle F, a step 80 is formed between the hole edge 50 and the slit edge 70. In this embodiment, the step 80 is formed by a portion of the outer circumferential surface 13a of the suction pipe 13 that is exposed by the suction slit 64. As a result, upstream of the intersection Q in the moving direction X of the fiber bundle F, the gap S is separated from the hole edge 50 by the amount of the step 80.

The step 80 between the first hole edge 51 and the upstream portion 71a of the first slit edge 71 is the first step 80a. The step 80 between the second hole edge 52 and the upstream portion 72a of the second slit edge 72 is the second step 80b. The width W80a of the first step 80a and the width W80b of the second step 80b in a direction perpendicular to the extension direction of the suction hole 35 and the suction slit 64 are the widths of the step 80 between the hole edge 50 and the slit edge 70 upstream of the intersection Q in the moving direction X of the fiber bundle F. In this embodiment, the width W80a of the first step 80a and the width W80b of the second step 80b are the same.

On the other hand, in this embodiment, downstream of the intersection point Q in the moving direction X of the fiber bundle F, the shape of the hole edge portion 50 and the shape of the slit edge portion 70 are the same. As described above, the second slit width W642 of the suction slit 64 is the same as the hole width W35 of the suction hole 35.

As shown in FIG. 7, the first hole edge 51 and the downstream portion 71b of the first slit edge 71 are aligned with a gap S in the direction in which the first pipe component 31 of the suction pipe 13 and the guide portion 60 of the guide member 16 overlap. The second hole edge 52 and the downstream portion 72b of the second slit edge 72 are aligned with a gap S in the direction in which the first pipe component 31 of the suction pipe 13 and the guide portion 60 of the guide member 16 overlap. Therefore, downstream of the intersection point Q in the moving direction X of the fiber bundle F, the width of the step between the hole edge 50 and the slit edge 70 is zero. In other words, there is no step between the hole edge 50 and the slit edge 70.

In this way, with the intersection point Q as the boundary, the widths W80a, W80b of the step 80 between the hole edge 50 and the slit edge 70 upstream of the intersection point Q in the moving direction X of the fiber bundle F are larger than the width of the step between the hole edge 50 and the slit edge 70 downstream of the intersection point Q.

<Operation of fiber bundle concentrating device>
After being sent out from the final send-out roller pair 111, the fiber bundle F is transported by the ventilation apron 15. In this embodiment, two fiber bundles F are transported per one ventilation apron 15. At this time, the fiber bundle F receives suction force from a suction source connected to the suction pipe 13 through the suction holes 35 of the suction pipe 13, the suction slits 64 of the guide member 16, and the ventilation apron 15. As a result, the fiber bundle F is pressed against the surface of the ventilation apron 15. In addition, the fiber bundle F is gathered so as to follow the suction holes 35 and the suction slits 64.

In detail, the fiber bundle F is arranged at a position where it passes through the upstream end point 350 of the suction hole 35 in the extension direction of the suction pipe 13. Upstream of the intersection Q in the moving direction X of the fiber bundle F, the fiber bundle F moves along the straight line L. That is, upstream of the intersection Q in the moving direction X of the fiber bundle F, the fiber bundle F passes between the first hole edge 51 and the first slit edge 71 and the second hole edge 52 and the second slit edge 72. More specifically, the fiber bundle F passes near the first hole edge 51 and the first slit edge 71 rather than the second hole edge 52 and the second slit edge 72. Downstream of the intersection Q, the fiber bundle F is focused by moving along the first hole edge 51 and the first slit edge 71. Therefore, the first hole edge 51 and the first slit edge 71 are guide edges that guide the focusing of the fiber bundle F. By bundling the fiber bundles F in this way, the generation of fluff and fluffing are suppressed.

Then, the fiber bundle F is twisted after passing through the nip position P of the nip roller pair 12. In this embodiment, the two fiber bundles F are twisted into one thread.
[Operation of the First Embodiment]
On the upstream side of the intersection Q in the moving direction X of the fiber bundle F, the fiber bundle F passes through a position away from the hole edge 50 and the slit edge 70, whereas on the downstream side of the intersection Q, the fiber bundle F is focused by moving along the hole edge 50 and the slit edge 70. For this reason, the region downstream of the intersection Q in the moving direction X of the fiber bundle F is more likely to affect the focusing of the fiber bundle F, and in turn the yarn quality, than the region upstream of the intersection Q. It is also known that clogging of the suction hole 35 and the suction slit 64 is more likely to occur in the region upstream of the intersection Q in the moving direction X of the fiber bundle F.

In this embodiment, the widths W80a and W80b of the step 80 between the hole edge 50 and the slit edge 70 upstream of the intersection Q in the moving direction X of the fiber bundle F are larger than the width of the step between the hole edge 50 and the slit edge 70 downstream of the intersection Q. In this way, the widths W80a and W80b of the step 80 can be made larger upstream of the intersection Q, which is an area where clogging is likely to occur and the quality of the yarn is unlikely to be affected, than on the downstream side, to suppress clogging. In detail, upstream of the intersection Q in the moving direction X of the fiber bundle F, the gap S between the suction pipe 13 and the guide member 16 is farther from the hole edge 50 than on the downstream side of the intersection Q, so that the fibers are less likely to get caught in the gap S. On the other hand, downstream of the intersection Q, which is an area that is likely to affect the quality of the yarn, the width of the step can be made smaller than on the upstream side to suppress deterioration of the quality of the yarn. Therefore, clogging of the suction hole 35 and the suction slit 64 can be suppressed while suppressing deterioration of the quality of the yarn.

[Effects of the First Embodiment]
The effects of this embodiment will be described.
(1-1) The suction pipe 13 has a suction hole 35 extending at an angle with respect to a direction perpendicular to the extension direction of the suction pipe 13. The guide member 16 has a suction slit 64 extending to overlap the suction hole 35. The widths W80a and W80b of a step 80 between the hole edge 50 and the slit edge 70 on the upstream side of the intersection Q in the moving direction X of the fiber bundle F are larger than the width of the step between the hole edge 50 and the slit edge 70 on the downstream side of the intersection Q, with the boundary being an intersection Q between a straight line L that passes through the upstream end point 350 of the suction hole 35 and is perpendicular to the extension direction of the suction pipe 13.

In this way, upstream of intersection Q, which is an area where clogging of suction holes 35 and suction slits 64 is likely to occur and is unlikely to affect yarn quality, clogging of suction holes 35 and suction slits 64 can be suppressed by making the widths W80a, W80b of the steps 80 larger than on the downstream side. On the other hand, downstream of intersection Q, which is an area where the yarn quality is likely to be affected, the width of the steps can be made smaller than on the upstream side to suppress deterioration of yarn quality. Therefore, clogging of suction holes 35 and suction slits 64 can be suppressed while suppressing deterioration of yarn quality.

(1-2) Downstream of the intersection Q in the moving direction X of the fiber bundle F, the hole width W35 of the suction hole 35 and the second slit width W642 of the suction slit 64 are the same. Therefore, downstream of the intersection Q in the moving direction X of the fiber bundle F, the width of the step between the hole edge 50 and the slit edge 70 is zero. In other words, downstream of the intersection Q in the moving direction X of the fiber bundle F, there is no step between the hole edge 50 and the slit edge 70. This makes it possible to further suppress deterioration of yarn quality compared to when a step between the hole edge 50 and the slit edge 70 is provided downstream of the intersection Q in the moving direction X of the fiber bundle F.

[Second embodiment]
A second embodiment of a fiber bundle collecting device for a spinning machine will be described below with reference to Figures 8 and 9. The second embodiment differs from the first embodiment only in the shapes of the suction hole 35 and the suction slit 64. Therefore, a description of the same configuration as the first embodiment will be omitted.

As shown in FIG. 8, the suction slit 64 of the second embodiment has the shape of the suction hole 35 of the first embodiment. The first slit edge portion 71 and the second slit edge portion 72 extend in parallel. The first slit edge portion 71 and the second slit edge portion 72 extend linearly along the extension direction of the suction slit 64. The second slit edge portion 72 is located on the opposite side of the first slit edge portion 71. The distance between the first slit edge portion 71 and the second slit edge portion 72 is the slit width W64 of the suction slit 64. The slit width W64 of the suction slit 64 is constant in the extension direction of the suction slit 64. The third slit edge portion 73 connects the upstream end of the first slit edge portion 71 and the upstream end of the second slit edge portion 72 in the moving direction X of the fiber bundle F. The third slit edge portion 73 extends in an arc shape.

The suction hole 35 in the second embodiment has the shape of the suction slit 64 in the first embodiment.
The first hole edge portion 51 has an upstream portion 51a, a downstream portion 51b, and a connecting portion 51c. The upstream portion 51a, the downstream portion 51b, and the connecting portion 51c each extend linearly. The upstream portion 51a extends along the extending direction of the suction hole 35. The downstream portion 51b is located downstream of the upstream portion 51a in the moving direction X of the fiber bundle F. The downstream portion 51b extends parallel to the upstream portion 51a. The downstream portion 51b extends along the extending direction of the suction hole 35. The connecting portion 51c connects the downstream end of the upstream portion 51a and the upstream end of the downstream portion 51b. The connecting portion 51c extends so as to be inclined with respect to the upstream portion 51a and the downstream portion 51b.

The second hole edge portion 52 has an upstream portion 52a, a downstream portion 52b, and a connection portion 52c. The upstream portion 52a, the downstream portion 52b, and the connection portion 52c each extend linearly. The upstream portion 52a extends along the extension direction of the suction hole 35. The downstream portion 52b is located downstream of the upstream portion 52a in the moving direction X of the fiber bundle F. The downstream portion 52b extends parallel to the upstream portion 52a. The downstream portion 52b extends along the extension direction of the suction hole 35. The connection portion 52c connects the downstream end of the upstream portion 52a and the upstream end of the downstream portion 52b. The connection portion 52c extends at an angle relative to the upstream portion 52a and the downstream portion 52b.

The upstream portion 51a of the first hole edge portion 51 and the upstream portion 52a of the second hole edge portion 52 face each other. The upstream portion 51a of the first hole edge portion 51 and the upstream portion 52a of the second hole edge portion 52 extend in parallel. The distance between the upstream portion 51a of the first hole edge portion 51 and the upstream portion 52a of the second hole edge portion 52 is the first hole width W351 of the suction hole 35. The first hole width W351 is different from the slit width W64 of the suction slit 64. In this embodiment, the first hole width W351 is larger than the slit width W64 of the suction slit 64.

The downstream portion 51b of the first hole edge 51 and the downstream portion 52b of the second hole edge 52 face each other. The downstream portion 51b of the first hole edge 51 and the downstream portion 52b of the second hole edge 52 extend in parallel. The distance between the downstream portion 51b of the first hole edge 51 and the downstream portion 52b of the second hole edge 52 is the second hole width W352 of the suction hole 35. The second hole width W352 is smaller than the first hole width W351. In this embodiment, the second hole width W352 is the same as the slit width W64 of the suction slit 64. Note that "the second hole width W352 is the same as the slit width W64" also includes the case where the second hole width W352 is different from the slit width W64 within the range of the manufacturing tolerance of the suction hole 35 and the suction slit 64.

The connection portion 51c of the first hole edge portion 51 and the connection portion 52c of the second hole edge portion 52 face each other. The distance between the connection portion 51c of the first hole edge portion 51 and the connection portion 52c of the second hole edge portion 52 gradually narrows from the upstream side to the downstream side in the moving direction X of the fiber bundle F. The distance between the connection portion 51c of the first hole edge portion 51 and the connection portion 52c of the second hole edge portion 52 is larger than the slit width W64 of the suction slit 64.

The third hole edge 53 connects the upstream end of the first hole edge 51 and the upstream end of the second hole edge 52 in the moving direction X of the fiber bundle F. The third hole edge 53 extends in an arc shape. In this embodiment, the radius of the virtual circle that constitutes the third hole edge 53 is larger than the radius of the virtual circle that constitutes the third slit edge 73.

The point located most upstream in the moving direction X of the fiber bundle F in the third hole edge portion 53 is defined as the upstream end point 350 of the suction hole 35. A straight line passing through the upstream end point 350 of the suction hole 35 and extending in a direction perpendicular to the extension direction of the suction pipe 13 is defined as line L. Line L intersects with the first hole edge portion 51. More specifically, line L intersects with the connection portion between the downstream portion 51b and the connection portion 51c in the first hole edge portion 51. The intersection point between line L and the first hole edge portion 51 is defined as intersection point Q.

<Relationship between suction hole and suction slit>
The first slit edge portion 71 overlaps with the intersection point Q. The first slit edge portion 71 and the second slit edge portion 72 each have a portion located upstream of the intersection point Q in the moving direction X of the fiber bundle F and a portion located downstream of the intersection point Q. The third slit edge portion 73 is located upstream of the intersection point Q in the moving direction X of the fiber bundle F.

Upstream of the intersection Q in the moving direction X of the fiber bundle F, the shape of the hole edge 50 and the shape of the slit edge 70 are different. As described above, the first hole width W351 of the suction hole 35 is larger than the slit width W64 of the suction slit 64. Therefore, the upstream portion 51a and the connection portion 51c of the first hole edge 51 are located outside the first slit edge 71. The upstream portion 52a and the connection portion 52c of the second hole edge 52 are located outside the second slit edge 72. In addition, the radius of the virtual circle that constitutes the third hole edge 53 is larger than the radius of the virtual circle that constitutes the third slit edge 73. Therefore, the third hole edge 53 is located outside the third slit edge 73. In other words, upstream of the intersection Q in the moving direction X of the fiber bundle F, the hole edge 50 is located one size outside the slit edge 70.

As shown in FIG. 9, upstream of the intersection point Q in the moving direction X of the fiber bundle F, a step 80 is formed between the hole edge 50 and the slit edge 70. In this embodiment, the step 80 is formed by a portion of the first surface 60a of the guide member 16 that is exposed by the suction hole 35. As a result, upstream of the intersection point Q in the moving direction X of the fiber bundle F, the gap S is separated from the slit edge 70 by the amount of the step 80.

In other words, in the first embodiment, the suction slit 64 is one size larger than the suction hole 35 upstream of the intersection Q in the moving direction X of the fiber bundle F, forming a step 80. In contrast, in the present embodiment, the suction hole 35 is one size larger than the suction slit 64 upstream of the intersection Q in the moving direction X of the fiber bundle F, forming a step 80.

The step 80 between the upstream portion 51a of the first hole edge portion 51 and the first slit edge portion 71 is the first step portion 80a. The step 80 between the upstream portion 52a of the second hole edge portion 52 and the second slit edge portion 72 is the second step portion 80b. The width W80a of the first step portion 80a and the width W80b of the second step portion 80b in a direction perpendicular to the extension direction of the suction hole 35 and the suction slit 64 are the widths of the step 80 between the hole edge portion 50 and the slit edge portion 70 upstream of the intersection point Q in the moving direction X of the fiber bundle F. In this embodiment, the width W80a of the first step portion 80a and the width W80b of the second step portion 80b are the same.

As in the first embodiment, downstream of the intersection Q in the moving direction X of the fiber bundle F, the shape of the hole edge portion 50 and the shape of the slit edge portion 70 are the same. As described above, the second hole width W352 of the suction hole 35 is the same as the slit width W64 of the suction slit 64. Therefore, the downstream portion 51b of the first hole edge portion 51 and the first slit edge portion 71 are aligned in the direction in which the first pipe component portion 31 of the suction pipe 13 and the guide portion 60 of the guide member 16 overlap with the gap S. The downstream portion 52b of the second hole edge portion 52 and the second slit edge portion 72 are aligned in the direction in which the first pipe component portion 31 of the suction pipe 13 and the guide portion 60 of the guide member 16 overlap with the gap S. Therefore, downstream of the intersection Q in the moving direction X of the fiber bundle F, the width of the step between the hole edge portion 50 and the slit edge portion 70 is zero. That is, no step is provided between the hole edge portion 50 and the slit edge portion 70.

In this way, even in the second embodiment, the widths W80a and W80b of the step 80 between the hole edge 50 and the slit edge 70 upstream of the intersection point Q in the moving direction X of the fiber bundle F are larger than the width of the step between the hole edge 50 and the slit edge 70 downstream of the intersection point Q.

In the second embodiment, it is possible to obtain the same effects as the effects (1-1) and (1-2) of the first embodiment.
[Third embodiment]
A third embodiment of a fiber bundle collecting device for a spinning machine will be described below with reference to Fig. 10. Note that the third embodiment differs from the first embodiment only in the number and shape of the suction holes 35 and the suction slits 64. Therefore, a description of the same configuration as the first embodiment will be omitted.

As shown in FIG. 10, the suction section 34 of the suction pipe 13 is composed of one suction hole 35. The guide member 16 also has one suction slit 64. In this embodiment, the fiber bundle F is transported downstream while being subjected to a traverse motion in the extension direction of the suction pipe 13 by a traverse device (not shown).

The suction hole 35 extends at an angle relative to a direction perpendicular to the extension direction of the suction pipe 13. In this embodiment, the suction hole 35 extends at an angle to the right side of the paper surface relative to a direction perpendicular to the extension direction of the suction pipe 13.

The first hole edge portion 51 has an upstream portion 51a, a downstream portion 51b, and a connection portion 51c. The upstream portion 51a and the downstream portion 51b extend linearly. The downstream portion 51b is located downstream of the upstream portion 51a in the moving direction X of the fiber bundle F. The inclination angle of the upstream portion 51a with respect to the direction perpendicular to the extension direction of the suction pipe 13 is larger than the inclination angle of the downstream portion 51b with respect to the direction perpendicular to the extension direction of the suction pipe 13. The connection portion 51c smoothly connects the downstream end of the upstream portion 51a and the upstream end of the downstream portion 51b.

The second hole edge portion 52 is located on the opposite side to the first hole edge portion 51. The second hole edge portion 52 has an upstream portion 52a, a downstream portion 52b, and a connection portion 52c.
The upstream portion 52a of the first hole edge portion 51 has a first straight portion 521 and a second straight portion 522 that extend linearly. The first straight portion 521 extends in a direction perpendicular to the extension direction of the suction pipe 13. The first straight portion 521 is located closer to the upstream portion 51a than the downstream portion 51b of the first hole edge portion 51 in the extension direction of the suction pipe 13. The second straight portion 522 extends downstream from the downstream end of the first straight portion 521 in the moving direction X of the fiber bundle F. The second straight portion 522 extends parallel to the upstream portion 51a of the first hole edge portion 51.

The downstream portion 52b of the second hole edge portion 52 extends in a straight line. The downstream portion 52b extends parallel to the downstream portion 51b of the first hole edge portion 51. The inclination angle of the second straight portion 522 with respect to the direction perpendicular to the extension direction of the suction pipe 13 is greater than the inclination angle of the downstream portion 52b of the second hole edge portion 52 with respect to the moving direction X of the fiber bundle F. The connecting portion 52c of the second hole edge portion 52 smoothly connects the downstream end of the second straight portion 522 and the upstream end of the downstream portion 52b. The connecting portion 52c of the second hole edge portion 52 extends parallel to the connecting portion 51c of the first hole edge portion 51.

The upstream portion 51a of the first hole edge portion 51 faces the upstream portion 52a of the second hole edge portion 52. The downstream portion 51b of the first hole edge portion 51 faces the downstream portion 52b of the second hole edge portion 52. The connection portion 51c of the first hole edge portion 51 faces the connection portion 52c of the second hole edge portion 52. In the moving direction X of the fiber bundle F, upstream of the connection portion between the first straight portion 521 and the second straight portion 522, the hole width of the suction hole 35, which is the distance between the first hole edge portion 51 and the second hole edge portion 52, increases from the downstream side to the upstream side. In the moving direction X of the fiber bundle F, downstream of the connection portion between the first straight portion 521 and the second straight portion 522, the hole width of the suction hole 35 is constant. In the moving direction X of the fiber bundle F, the hole width downstream of the connection between the first straight portion 521 and the second straight portion 522 is smaller than the hole width upstream of the connection between the first straight portion 521 and the second straight portion 522.

The third hole edge 53 connects the upstream end of the first hole edge 51 and the upstream end of the second hole edge 52. The third hole edge 53 extends linearly along the extension direction of the suction pipe 13. Therefore, even if the position of the fiber bundle F changes in the extension direction of the suction pipe 13 due to the traverse motion, the distance from the nip position of the final delivery roller pair 111 to the suction hole 35 is kept constant.

In the third embodiment, the point on the third hole edge 53 that is farthest from the first hole edge 51 is the upstream end point 350 of the suction hole 35. A straight line that passes through the upstream end point 350 of the suction hole 35 and extends in a direction perpendicular to the extension direction of the suction pipe 13 is called line L. Line L extends along the first straight line portion 521. The range of the traverse motion of the fiber bundle F is set to include line L. Line L intersects with the first hole edge 51. The intersection of line L and the first hole edge 51 is called intersection Q.

The first slit edge portion 71 has an upstream portion 71a, a downstream portion 71b, and a connection portion 71c. The upstream portion 71a extends linearly. The upstream portion 71a extends parallel to the upstream portion 51a of the first hole edge portion 51. The downstream portion 71b is located downstream of the upstream portion 71a in the moving direction X of the fiber bundle F. The downstream portion 71b extends parallel to the downstream portion 51b and the connection portion 51c of the first hole edge portion 51. The connection portion 71c connects the downstream end of the upstream portion 71a to the upstream end of the downstream portion 71b.

The second slit edge portion 72 has an upstream portion 72a, a downstream portion 72b, and a connection portion 72c. The upstream portion 72a extends linearly. The upstream portion 72a extends parallel to the first linear portion 521 of the upstream portion 52a of the second hole edge portion 52. In other words, the upstream portion 72a extends along a direction perpendicular to the extension direction of the suction pipe 13. The downstream portion 72b is located downstream of the upstream portion 72a in the moving direction X of the fiber bundle F. The downstream portion 72b extends parallel to the downstream portion 52b and the connection portion 52c of the second hole edge portion 52. The connection portion 72c connects the downstream end of the upstream portion 72a to the upstream end of the downstream portion 72b.

The upstream portion 71a of the first slit edge portion 71 faces the upstream portion 72a of the second slit edge portion 72. The downstream portion 71b of the first slit edge portion 71 faces the downstream portion 72b of the second slit edge portion 72. The downstream portion 71b of the first slit edge portion 71 and the downstream portion 72b of the second slit edge portion 72 extend in parallel. The connection portion 71c of the first slit edge portion 71 faces the connection portion 72c of the second slit edge portion 72.

Upstream of the connection between the downstream portion 71b and the connection portion 71c of the first slit edge portion 71 in the moving direction X of the fiber bundle F, the slit width of the suction slit 64, which is the distance between the first slit edge portion 71 and the second slit edge portion 72, increases from the downstream side to the upstream side. The slit width of the suction slit 64 upstream of the connection between the downstream portion 71b and the connection portion 71c of the first slit edge portion 71 in the moving direction X of the fiber bundle F is larger than the hole width of the suction hole 35.

The slit width of the suction slit 64 is constant downstream of the connection between the downstream portion 71b and the connection portion 71c of the first slit edge portion 71 in the moving direction X of the fiber bundle F. The slit width downstream of the connection between the downstream portion 71b and the connection portion 71c of the first slit edge portion 71 in the moving direction X of the fiber bundle F is smaller than the slit width upstream of the connection between the downstream portion 71b and the connection portion 71c of the first slit edge portion 71. In this embodiment, the slit width of the suction slit 64 downstream of the connection between the downstream portion 71b and the connection portion 71c of the first slit edge portion 71 in the moving direction X of the fiber bundle F is the same as the hole width of the suction hole 35 downstream of the connection between the first straight portion 521 and the second straight portion 522 in the moving direction X of the fiber bundle F. Note that "the slit width is the same as the hole width" also includes the case where the slit width is different from the hole width within the range of the manufacturing tolerance of the suction hole 35 and the suction slit 64.

<Relationship between suction hole and suction slit>
A connection portion between the downstream portion 71b and the connection portion 71c of the first slit edge portion 71 overlaps with the intersection point Q. The upstream portion 71a and the connection portion 71c of the first slit edge portion 71, the upstream portion 72a and the connection portion 72c of the second slit edge portion 72, and the third slit edge portion 73 are located upstream of the intersection point Q in the moving direction X of the fiber bundle F. The downstream portion 71b of the first slit edge portion 71 and the downstream portion 72b of the second slit edge portion 72 are located downstream of the intersection point Q in the moving direction X of the fiber bundle F.

Upstream of the intersection Q in the moving direction X of the fiber bundle F, the shape of the hole edge 50 and the shape of the slit edge 70 are different. Upstream of the intersection Q in the moving direction X of the fiber bundle F, the slit width of the suction slit 64 is larger than the hole width of the suction hole 35. Therefore, the upstream part 71a and the connection part 71c of the first slit edge 71 are located outside the first hole edge 51. The upstream part 72a and the connection part 72c of the second slit edge 72 are located outside the second hole edge 52. In addition, the third slit edge 73 is located outside the third hole edge 53. In other words, upstream of the intersection Q in the moving direction X of the fiber bundle F, the slit edge 70 is located one size outside the hole edge 50.

Upstream of the intersection Q in the moving direction X of the fiber bundle F, a step 80 is formed between the hole edge 50 and the slit edge 70. In this embodiment, the step 80 is formed by a portion of the outer circumferential surface 13a of the suction pipe 13 that is exposed by the suction slit 64. As a result, upstream of the intersection Q in the moving direction X of the fiber bundle F, the gap S is separated from the hole edge 50 by the amount of the step 80.

The step 80 between the upstream portion 51a of the first hole edge portion 51 and the upstream portion 71a of the first slit edge portion 71 is defined as the first step portion 80a. The step 80 between the first straight portion 521 of the upstream portion 52a of the second hole edge portion 52 and the upstream portion 72a of the second slit edge portion 72 is defined as the second step portion 80b. The width W80a of the first step portion 80a and the width W80b of the second step portion 80b are the widths of the step 80 between the hole edge portion 50 and the slit edge portion 70 upstream of the intersection point Q in the moving direction X of the fiber bundle F. In this embodiment, the width W80a of the first step portion 80a and the width W80b of the second step portion 80b are the same.

As in the first embodiment, downstream of the intersection point Q in the moving direction X of the fiber bundle F, the shape of the hole edge portion 50 and the shape of the slit edge portion 70 are the same. Downstream of the intersection point Q in the moving direction X of the fiber bundle F, the slit width of the suction slit 64 is the same as the hole width of the suction hole 35.

The first hole edge 51 and the downstream portion 71b of the first slit edge 71 are aligned with a gap S in the direction in which the first pipe component 31 of the suction pipe 13 and the guide portion 60 of the guide member 16 overlap. The second hole edge 52 and the downstream portion 72b of the second slit edge 72 are aligned with a gap S in the direction in which the first pipe component 31 of the suction pipe 13 and the guide portion 60 of the guide member 16 overlap. Therefore, downstream of the intersection point Q in the moving direction X of the fiber bundle F, the width of the step between the hole edge 50 and the slit edge 70 is zero. In other words, there is no step between the hole edge 50 and the slit edge 70.

In this way, even in the second embodiment, the widths W80a and W80b of the step 80 between the hole edge 50 and the slit edge 70 upstream of the intersection point Q in the moving direction X of the fiber bundle F are larger than the width of the step between the hole edge 50 and the slit edge 70 downstream of the intersection point Q.

In the third embodiment, it is possible to obtain the same effects as the effects (1-1) and (1-2) of the first embodiment.
[Example of change]
The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

In each of the above embodiments, no step was provided downstream of the intersection Q in the moving direction X of the fiber bundle F by setting the width of the step between the hole edge portion 50 and the slit edge portion 70 to zero, but a step may be provided between the hole edge portion 50 and the slit edge portion 70. However, the width of the step between the hole edge portion 50 and the slit edge portion 70 downstream of the intersection Q in the moving direction X of the fiber bundle F is smaller than the widths W80a and W80b of the step 80 between the hole edge portion 50 and the slit edge portion 70 upstream of the intersection Q in the moving direction X of the fiber bundle F.

In each of the above embodiments, the width W80a of the first step portion 80a and the width W80b of the second step portion 80b are the same, but the width W80a of the first step portion 80a and the width W80b of the second step portion 80b do not have to be the same.

11 and 12, the width W80a of the first step portion 80a may be smaller than the width W80b of the second step portion 80b. Upstream of the intersection point Q in the moving direction X of the fiber bundle F, the fiber bundle F passes near the first hole edge portion 51 and the first slit edge portion 71 rather than the second hole edge portion 52 and the second slit edge portion 72. For this reason, the first step portion 80a is more likely to affect the quality of the yarn than the second step portion 80b. Therefore, by making the width W80a of the first step portion 80a smaller than the width W80b of the second step portion 80b, the deterioration of the quality of the yarn can be further suppressed. Note that although FIGS. 11 and 12 show a modified example of the first embodiment, the width W80a of the first step portion 80a may be smaller than the width W80b of the second step portion 80b in the second and third embodiments.

In the third embodiment, the suction hole 35 may extend inclined to the left side of the paper surface of FIG. 10 with respect to a direction perpendicular to the extending direction of the suction pipe 13 .
The shape of the suction hole 35 may be the same as the shape of the suction slit 64 of the third embodiment, and the shape of the suction slit 64 may be the same as the shape of the suction hole 35 of the third embodiment. That is, as in the second embodiment, the step 80 may be formed by making the suction hole 35 one size larger than the suction slit 64 upstream of the intersection Q in the moving direction X of the fiber bundle F. In this case, the step 80 is formed by a portion of the first surface 60a of the guide member 16 that is exposed from the suction hole 35.

10...fiber bundle concentrating device, 13...suction pipe, 15...ventilation apron, 16...guide member, 35...suction hole, 50...hole edge, 51...first hole edge, 52...second hole edge, 64...suction slit, 70...slit edge, 80...step, 100...spinning machine, 110...draft device, 350...upstream end point, F...fiber bundle, L...straight line, Q...intersection, X...fiber bundle movement direction.

Claims (3)

A suction pipe provided downstream of the draft device in the moving direction of the fiber bundle;
a guide member attached to the suction pipe in correspondence with a wrapping position of the ventilation apron wrapped around the suction pipe, the guide member guiding the movement of the ventilation apron;
Equipped with
The suction pipe has a suction hole extending at an angle with respect to a direction perpendicular to the extension direction of the suction pipe,
The guide member is a fiber bundle collecting device of a spinning machine having a suction slit extending so as to overlap with the suction hole,
The boundary is an intersection point between a straight line passing through the upstream end point of the suction hole and perpendicular to the extending direction of the suction pipe and a hole edge portion that is the edge portion of the suction hole,
A fiber bundle collecting device for a spinning machine, characterized in that the width of a step between the hole edge portion and the slit edge portion, which is the edge of the suction slit, upstream of the intersection in the movement direction of the fiber bundle is larger than the width of a step between the hole edge portion and the slit edge portion downstream of the intersection. The fiber bundle collecting device of a spinning machine according to claim 1, wherein the width of the step between the hole edge and the slit edge downstream of the intersection in the fiber bundle movement direction is zero. The hole edge portion includes a first hole edge portion intersecting the straight line and a second hole edge portion located on the opposite side to the first hole edge portion,
A fiber bundle collecting device for a spinning machine as described in claim 1 or claim 2, wherein the width of the step between the first hole edge portion and the slit edge portion upstream of the intersection in the movement direction of the fiber bundle is smaller than the width of the step between the second hole edge portion and the slit edge portion upstream of the intersection in the movement direction of the fiber bundle.

Images