CN213327994U - Hollow guide shaft body and hollow guide unit - Google Patents

Abstract

The utility model relates to a cavity direction axis body and cavity guide unit. The hollow guide shaft body (40) has a 1 st wall surface (43), a 2 nd wall surface (45), and a 3 rd wall surface (47). The 1 st wall surface (43) is connected to an inlet (41) for introducing the fiber, and forms a 1 st space (42). The 2 nd wall surface (45) is connected to the downstream side of the 1 st wall surface (43) to form a 2 nd space (44), and the 2 nd space (44) has a constant diameter and a larger diameter than the 1 st space (42). The 3 rd wall surface 47 is connected to the downstream side of the 2 nd wall surface 45, and forms a 3 rd space 46 having a larger diameter than the 2 nd space 44. The 3 rd wall surface (47) has an arc-shaped portion and a tapered portion. The arc-shaped part is formed at the end part of the 2 nd wall surface (45) side, comprises a curved surface bulging towards the 3 rd space (46), and is smoothly connected with the 2 nd wall surface (45). The tapered portion is connected to the arcuate portion, and the diameter increases as the downstream side approaches.

Description

Hollow guide shaft body and hollow guide unit

Technical Field

The utility model mainly relates to a cavity direction axis body and cavity direction unit that open-end spinning used.

Background

An air-jet spinning device is known which generates a spun yarn by applying a whirling airflow to a fiber bundle and twisting the fiber bundle. The open-end spinning device has a hollow guide shaft body. For example, the hollow guide shaft body is cylindrical or conical. A swirl chamber is formed around the hollow guide shaft body. The fibers introduced into the swirling chamber are rotated and swung around the hollow guide shaft body in the swirling chamber by the action of the swirling air flow. Thus, twisting can be applied to the fibers. The twisted fibers (i.e., the spun yarn) pass through a space formed inside the hollow guide shaft body.

In the interior of a hollow guide shaft (spindle) of japanese patent application laid-open No. 10-317232 (patent document 1), a fine passage, a tapered passage, and a coarse passage are formed in this order from a fiber inlet.

A guide tube for guiding a fiber is provided inside a hollow guide shaft body of jp 2017-a 25437 (patent document 2). In addition, 2 stepped high-low surfaces are formed in the hollow guide shaft body at the boundary between the 1 st shaft body part and the 2 nd shaft body part and in the vicinity thereof. The end of the guide pipe on the upstream side is provided in contact with the high-low surface on the upstream side.

In the structure of patent document 2, when the guide tube is inserted into the hollow guide shaft body, the guide tube may collide with the downstream high-low surface, and as a result, the end portion of the guide tube may be damaged. The hollow guide shaft body of patent document 1 is configured such that a tubular member such as a guide tube is not inserted into the hollow guide shaft body.

SUMMERY OF THE UTILITY MODEL

The main object of the present invention is to provide a hollow guide shaft body of a structure in which a tubular member is not easily damaged when the tubular member is inserted.

According to the 1 st aspect of the present invention, there is provided a hollow guide shaft body for open-end spinning configured as follows. That is, the hollow guide shaft body has the 1 st wall surface, the 2 nd wall surface, and the 3 rd wall surface. The 1 st wall surface is connected to the inlet for introducing the fiber to form a 1 st space. The 2 nd wall surface is connected to the downstream side of the 1 st wall surface in the fiber passing direction to form a 2 nd space, and the 2 nd space has a constant diameter and a larger diameter than the 1 st space. The 3 rd wall surface is connected to the downstream side of the 2 nd wall surface in the fiber passing direction, and forms a 3 rd space having a larger diameter than the 2 nd space. The 3 rd wall surface has an arc portion and a tapered portion. The arc-shaped part is formed at the end of the 2 nd wall surface side, includes a curved surface bulging toward the inside of the 3 rd space, and is smoothly connected to the 2 nd wall surface. The tapered portion is connected to the arcuate portion, and the diameter of the tapered portion increases toward the downstream side in the fiber passage direction.

Thus, since the 3 rd wall surface has the arc-shaped portion and the tapered portion, when the tubular member is inserted into the hollow guide shaft body, the tubular member can be prevented from strongly colliding with the inner wall of the hollow guide shaft body. Therefore, the tubular member can be made less susceptible to breakage.

In the hollow guide shaft body, no surface perpendicular to the fiber passing direction nor angular portion is formed at the boundary portion between the 2 nd space and the 3 rd space. Therefore, when the tubular member is inserted into the hollow guide shaft body, the tubular member is less likely to be broken.

In the hollow guide shaft body, the radius of curvature of the arcuate portion is preferably 0.3mm to 3 mm.

Thus, the arcuate portion is sufficiently smooth, so that the cylindrical member is not easily broken even if the cylindrical member hits the arcuate portion.

In the hollow guide shaft body, the radius of curvature of the arcuate portion is more preferably 0.3mm or more and 2mm or less. Therefore, the tubular member can be made more resistant to breakage.

In the hollow guide shaft body, the radius of curvature of the arcuate portion is more preferably 0.3mm to 1.5 mm. Therefore, the cylindrical member can be further made less susceptible to breakage.

In the hollow guide shaft, the length of the 2 nd space in the fiber passage direction is preferably 0.8mm to 2.7 mm.

Thus, when the tubular member is inserted into the 2 nd space, the tubular member can be sufficiently stabilized.

In the hollow guide shaft body, a lower limit of the length of the 2 nd space is preferably 1.0mm, 1.7mm, or 1.9 mm. Thus, when the tubular member is inserted into the 2 nd space, the tubular member can be further stabilized.

In the hollow guide shaft body, an upper limit of the length of the 2 nd space is preferably 2.5mm or 2.2 mm. Thus, when the tubular member is inserted into the 2 nd space, the tubular member can be further stabilized.

The hollow guide shaft body preferably has the following structure. That is, the 2 nd space includes a columnar space, and an angle formed by the central axis and the tapered portion is 45 ° or less in a cross section taken in parallel with a plane passing through the central axis of the 2 nd space.

Thus, even if the cylindrical member comes into contact with the tapered portion, the cylindrical member can be guided to the inlet port side without giving a large impact to the cylindrical member.

In the hollow guide shaft body, a lower limit of the angle formed by the central axis and the tapered portion is preferably 20 ° or more. Thus, even if the cylindrical member comes into contact with the tapered portion, the impact on the cylindrical member can be further reduced, and the cylindrical member can be guided to the inlet port.

According to the 2 nd aspect of the present invention, there is provided the hollow guide unit having the above hollow guide shaft body and the tubular member. The tubular member is provided in the 2 nd space and the 3 rd space of the hollow guide shaft body.

Thus, the hollow guide unit in which the tubular member is not easily broken can be realized.

The hollow guide unit preferably has the following structure. That is, an O-ring groove for attaching an O-ring is formed on the outer surface of the cylindrical member. The O-ring is attached to the O-ring groove. The O-ring groove is located closer to the 1 st space than the arcuate portion in the fiber passing direction.

Thus, even if the O-ring hits the arc-shaped portion, the O-ring is not easily broken because the arc-shaped portion is not sharp. Further, the portion where the O-ring groove is formed has low strength, but since this portion is covered with the 2 nd space, the cylindrical member is less likely to be broken or the like.

In the hollow guide unit, a length from an upstream end of the arcuate portion to a downstream end of the O-ring groove in the fiber passage direction is preferably 0mm to 1.0 mm.

Thus, the entire O-ring is provided in the 2 nd space, and therefore the 1 st space can be reliably sealed from the 3 rd space by the O-ring.

In the hollow guide shaft body, the length from the upstream end of the arcuate portion to the downstream end of the O-ring groove is preferably 0mm to 0.7 mm. Therefore, the 1 st space can be more reliably sealed from the 3 rd space by the O-ring.

In the hollow guide shaft body, the length from the upstream end of the arcuate portion to the downstream end of the O-ring groove is preferably 0.2mm to 0.5 mm. Therefore, the 1 st space can be more reliably sealed from the 3 rd space by the O-ring.

The hollow guide unit preferably has the following structure. That is, a fiber path is formed inside the cylindrical member. The cylindrical member is provided with a nozzle having a circular cross-section of a flow path connecting the fiber path and the 3 rd space. The length from the end of the nozzle on the 3 rd space side to the 3 rd wall surface in the radial direction of the 3 rd space is equal to or greater than the diameter of the nozzle.

Therefore, the cross-sectional area of the flow path from the 3 rd space to the nozzle can be sufficiently ensured, and a sufficient flow rate can be ensured

According to the 3 rd aspect of the present invention, there is provided the following method for manufacturing a hollow guide unit. That is, the manufacturing method includes the 1 st step, the 2 nd step, and the 3 rd step. In the step 1, the cylindrical member is brought into contact with the tapered portion of the hollow guide shaft body. In the 2 nd step, the cylindrical member in contact with the tapered portion is moved toward the 2 nd space along the tapered portion. In the 3 rd step, the cylindrical member is provided in the 2 nd space.

Since the 2 nd space and the 3 rd space of the hollow guide shaft body are smoothly connected by the arcuate portion, even if the tubular member is moved along the tapered portion, the tubular member can be disposed in the 2 nd space without giving a large impact to the tubular member. Therefore, the cylindrical member can be made less likely to be broken.

Drawings

Fig. 1 is a front view showing an overall structure of a spinning machine including a hollow guide shaft body according to an embodiment of the present invention.

Fig. 2 is a side view of the spinning unit.

Fig. 3 is a sectional view showing the structure of the air-jet spinning device.

Fig. 4 is a sectional perspective view showing the structure of the hollow guide shaft body and the tubular member.

Fig. 5 is a sectional view showing the structure of the hollow guide shaft body and the tubular member.

Fig. 6 is a view showing a process of attaching the tubular member to the hollow guide shaft body.

Fig. 7 is an enlarged sectional view of the hollow guide unit.

Detailed Description

Next, a spinning machine 1 including a hollow guide shaft body 40 according to an embodiment of the present invention will be described with reference to the drawings. The spinning machine 1 shown in fig. 1 includes a plurality of spinning units 2 arranged in parallel, a yarn joining cart 3, a power machine case 4, and a machine station control device 90.

The machine control device 90 is a device that centrally manages the respective components of the spinning machine 1, and includes a display 91 and an input key 92. The operator can set a specific spinning unit 2 or all of the spinning units 2 by performing an appropriate operation using the input key 92, and can display the setting, the state, and the like of the specific spinning unit 2 or all of the spinning units 2 on the display 91.

As shown in fig. 2, each spinning unit 2 includes a draft device 7, an air-jet spinning device 9, a yarn accumulating device 14, and a winding device 96, which are provided in this order from upstream to downstream. In the present specification, "upstream" and "downstream" refer to upstream and downstream in the direction of travel (passage) of the sliver 6, the fiber bundle 8, and the spun yarn 10 during spinning. Each spinning unit 2 spins the fiber bundle 8 sent from the draft device 7 by the air-jet spinning device 9 to generate the spun yarn 10, and the spun yarn 10 is wound by the winding device 96 to form the package 28.

The draft device 7 is provided near the upper end of the frame 5 of the spinning machine 1. The draft device 7 includes 4 pairs of a rear roller pair 21, a third roller pair 22, an intermediate roller pair 24 having a apron 23, and a front roller pair 25 in this order from the upstream side. The draft device 7 drafts the sliver 6 supplied from a sliver box (not shown) through the sliver guide 20 to a predetermined thickness (stretches the fiber bundle 8). The fiber bundle 8 drafted by the draft device 7 is supplied to the air-jet spinning device 9.

The air-jet spinning device 9 twists the fiber bundle 8 supplied from the draft device 7 by a whirling airflow to generate a spun yarn 10. The specific configuration of the air-jet spinning device 9 will be described later.

A yarn quality measuring device 12 and a spinning sensor 13 are provided downstream of the air spinning device 9. The spun yarn 10 spun by the air spinning device 9 passes through a yarn quality measuring instrument 12 and a spinning sensor 13.

The yarn quality measuring device 12 monitors the thickness of the traveling spun yarn 10 by an optical sensor not shown. When the yarn quality measuring device 12 detects a yarn defect (a portion where the thickness of the spun yarn 10 or the like is abnormal) in the spun yarn 10, a yarn defect detection signal is transmitted to a unit controller (not shown). The yarn quality measuring device 12 is not limited to an optical sensor, and may be configured to monitor the thickness of the spun yarn 10 using a capacitance-type sensor, for example. The yarn quality measuring device 12 may detect a foreign substance contained in the spun yarn 10 as a yarn defect.

The spinning sensor 13 is provided immediately downstream of the yarn quality measuring device 12. The spinning sensor 13 can detect the tension of the spun yarn 10 between the air-jet spinning device 9 and the yarn accumulating device 14. The spinning sensor 13 transmits a detection signal of the detected tension to the unit controller. The unit controller monitors the tension detected by the spinning sensor 13 to detect an abnormal portion such as a weak twisted yarn. The spinning unit 2 may not have the spinning sensor 13.

When the unit controller determines that the spun yarn 10 should be cut based on the detection result of the yarn quality measuring device 12 or the spinning sensor 13, the spinning unit 2 stops the spinning (the ejection of air from the spinning nozzle 33) by the air-jet spinning device 9 to cut the spun yarn 10. The spinning unit 2 may stop the draft by the draft device 7 (rotation of the rear roller pair 21) to cut the spun yarn 10. Alternatively, the spinning unit 2 may have a cutter, and the spun yarn 10 may be cut by the cutter.

A yarn accumulating device 14 is provided downstream of the yarn quality measuring device 12 and the spinning sensor 13. As shown in fig. 2, the yarn accumulating device 14 includes a yarn accumulating roller 15 and a motor 16 for rotating the yarn accumulating roller 15.

The yarn accumulating roller 15 can temporarily accumulate the spun yarn 10 wound around a predetermined amount on the outer peripheral surface thereof. In a state where the spun yarn 10 is wound around the outer peripheral surface of the yarn accumulating roller 15, the spun yarn 10 can be pulled out at a predetermined speed from the air-jet spinning device 9 and conveyed to the downstream side by rotating the yarn accumulating roller 15 at a predetermined rotational speed. Further, since the spun yarn 10 can be temporarily accumulated on the outer peripheral surface of the yarn accumulating roller 15, the yarn accumulating device 14 can function as a kind of buffer. This eliminates a problem that the spinning speed and the winding speed of the air-jet spinning device 9 (the speed of the spun yarn 10 wound into the package 28) are different for some reason (for example, the spun yarn 10 is loosened).

The yarn guide 17 and the winding device 96 are provided downstream of the yarn accumulating device 14. The winding device 96 includes a cradle arm 97 that can rotatably support a bobbin for winding the spun yarn 10.

The winding device 96 includes a winding drum 98, a traverse guide 99, and a winding drum drive motor, not shown. The winding drum 98 is rotated in contact with the outer peripheral surface of the bobbin or package 28 by the driving force transmitted from the winding drum driving motor. The traverse guide 99 can guide the spun yarn 10. The winding device 96 drives the winding drum 98 by a winding drum drive motor while reciprocating the traverse guide 99 by a drive mechanism not shown. Thus, the winding device 96 rotates the package 28 in contact with the winding drum 98, and winds the spun yarn 10 into the package 28 while traversing the spun yarn 10.

As shown in fig. 1 and 2, the yarn joining cart 3 includes a yarn joining device 93, a suction pipe 94, and a suction nozzle 95. If a yarn break or yarn cutting occurs in a certain spinning unit 2, the yarn joining cart 3 travels on a not-shown rail to the spinning unit 2 and stops. The suction pipe 94 rotates upward about the shaft, catches the spun yarn 10 fed from the air-jet spinning device 9, and guides the spun yarn 10 to the yarn joining device 93 by rotating downward about the shaft. The suction nozzle 95 rotates downward about the axis, catches the spun yarn 10 from the package 28, and guides the spun yarn 10 to the yarn joining device 93 by rotating upward about the axis. The yarn joining device 93 joins the guided spun yarns 10 to each other.

Next, the air-jet spinning device 9 will be described with reference to fig. 3 and 4.

The air-jet spinning device 9 twists the fiber bundle 8 supplied from the draft device 7 to produce a spun yarn 10. As shown in fig. 3, the air-jet spinning device 9 has a nozzle block 30 and a hollow guide shaft body 40. The nozzle block 30 has a fiber guide 31, a spinning chamber 32, and a spinning nozzle 33.

The fiber guide 31 guides the fiber bundle 8 drafted by the draft device 7 toward the inside (downstream side) of the air-jet spinning device 9. A guide hole 31a is formed in the fiber guide portion 31, and a guide needle 31b is provided in the fiber guide portion 31. The fiber bundle 8 drafted by the draft device 7 is introduced from the guide hole 31a, and is inserted into the guide needle 31b to be guided to the downstream side.

A spinning chamber 32 is formed downstream of the fiber guide 31. The spinning chamber 32 is formed between the nozzle block 30 and the hollow guide shaft body 40. A spinning nozzle 33 is formed in the nozzle block 30, and compressed air (hereinafter, simply referred to as "air") supplied from a compressed air source (not shown) is ejected from the spinning nozzle 33 into the spinning chamber 32. This generates a whirling airflow in the spinning chamber 32. The fiber bundle 8 is twisted by the swirling airflow in the spinning chamber 32 and then sent to the hollow guide shaft body 40.

The hollow guide shaft body 40 guides the fiber bundle 8 twisted in the nozzle block 30 to the downstream side.

The hollow guide shaft body 40 is a member in which a space having a cylindrical shape or a truncated cone shape is formed. The hollow guide shaft body 40 has a shape in which the inner diameter increases as the downstream side approaches. An introduction port 41 is formed at the tip (upstream end) of the hollow guide shaft body 40. The inlet 41 is a portion into which the fiber bundle 8 (spun yarn 10) twisted in the spinning chamber 32 is introduced. The fiber bundle 8 introduced from the inlet 41 passes through the inside of the hollow guide shaft body 40 and is conveyed to the downstream side. The detailed shape of the hollow guide shaft body 40 will be described later.

A tubular member 50 is provided inside the hollow guide shaft body 40. The fiber bundle 8 passing through the hollow guide shaft body 40 is further moved downstream by the tubular member 50. In the following description, a state in which the hollow guide shaft body 40 and the tubular member 50 are combined is referred to as a hollow guide unit 100. The tubular member 50 is a substantially cylindrical member, and has a distal end portion 51, a central portion 52, and a proximal end portion 53 in this order from the upstream side.

The distal end portion 51 is a cylindrical portion having a substantially constant outer diameter. A notch (tapered surface) is formed on the distal end side of the distal end portion 51. An O-ring groove 54 and a plurality of auxiliary nozzles 56 are formed on the surface of the distal end portion 51. The O-ring groove 54 is an annular recess formed in the circumferential direction on the outer surface of the distal end portion 51. An O-ring 55 is attached to the O-ring groove 54. The auxiliary nozzle 56 is formed downstream of the O-ring groove 54. Each auxiliary nozzle 56 is a hole formed to penetrate in a direction perpendicular to the axial direction of the tubular member 50 (or a direction in which the direction is moved parallel thereto). The auxiliary nozzles 56 are formed in a circumferential direction. The compressed air supplied to the tubular member 50 is ejected to the fiber path inside the tubular member 50 through the auxiliary nozzle 56. This can generate a swirling airflow in the fiber path inside the cylindrical member 50. Further, any of the O-ring 55 and the sub-nozzle 56 may be omitted.

The central portion 52 is a cylindrical portion located on the downstream side of the distal end portion 51. The fiber bundle 8 passing through the fiber path inside the distal end portion 51 then passes through the fiber path inside the central portion 52. The central portion 52 has a shape in which the inner diameter slightly increases toward the downstream side, but the inner diameter may be constant.

The base end portion 53 is a cylindrical portion located on the downstream side of the central portion 52. The base end portion 53 has a smaller outer diameter than the central portion 52. Therefore, a high-low surface is formed at the boundary between the central portion 52 and the base end portion 53. The cylindrical member 50 is supported by a bracket 60 described later via the high-low surface. Further, a fiber path is also formed inside the base end portion 53.

The bracket 60 supports the hollow guide shaft body 40 and the tubular member 50. The bracket 60 has a flow path for supplying air to the auxiliary nozzle 56. The bracket 60 has a 1 st support portion 61 and a 2 nd support portion 63. The 1 st support portion 61 supports the downstream end of the hollow guide shaft body 40. A 1 st seal member 62 is provided between the hollow guide shaft body 40 and the 1 st support portion 61. The 2 nd support portion 63 supports the high-low surface of the tubular member 50. A 2 nd seal member 64 is provided between the cylindrical member 50 and the 2 nd support portion 63.

An air supply path 65 is formed in the bracket 60. The air supply path 65 is connected to a compressed air supply source, not shown. When the compressed air is supplied from the air supply path 65, the supplied compressed air passes through between the tubular member 50 and the bracket 60, then passes through between the hollow guide shaft body 40 and the tubular member 50, and flows upstream in the fiber traveling direction. Thereafter, the compressed air is ejected from the auxiliary nozzle 56 toward the fiber path inside the tubular member 50.

When the yarn discharge spinning is performed, air is ejected from both the spinning nozzle 33 and the auxiliary nozzle 56 or only the auxiliary nozzle 56 to generate a swirling air flow. The yarn discharge spinning is a spinning operation performed to start the generation of the spun yarn 10 from a state where the spinning by the air-jet spinning device 9 is interrupted or stopped. The fiber bundle 8 drafted by the draft device 7 is sent to the hollow guide shaft body 40 and the tubular member 50 in a loose, false twist state by the whirling airflow generated in the spinning chamber 32. The whirling airflow generated inside the tubular member 50 is opposite in direction to the whirling airflow in the spinning chamber 32. Therefore, the fiber bundle 8 is fed to the downstream side while being spun into a twisted fiber shape, and is discharged as a spun yarn 10 from the hollow guide shaft body 40. In normal spinning performed after the discharge spinning, a swirling airflow is generated in the spinning chamber 32. That is, the compressed air is ejected from the spinning nozzle 33 and is not ejected from the auxiliary nozzle 56. However, in the case of normal spinning, compressed air may be injected from the auxiliary nozzle 56 in an auxiliary manner. In this case, the pressure of the compressed air injected from the auxiliary nozzle 56 during normal spinning may be set lower than the pressure of the compressed air injected from the auxiliary nozzle 56 during yarn discharge spinning.

Next, the detailed shapes of the hollow guide shaft body 40 and the tubular member 50 will be described with reference to fig. 4 and 5.

As described above, since the hollow guide shaft body 40 is a hollow member, a space is formed inside the hollow guide shaft body 40. Hereinafter, the space will be described as being divided into the 1 st space 42, the 2 nd space 44, and the 3 rd space 46.

As shown in fig. 4 and 5, the 1 st space 42 is a space extending from the upstream end (i.e., the introduction port 41) of the hollow guide shaft body 40 to the downstream side. The fiber bundle 8 entering the hollow guide shaft body 40 from the introduction port 41 passes through the 1 st space 42. The 1 st space 42 is a cylindrical space having a constant diameter. In the present specification, the constant diameter is not strictly constant but includes a case where the diameter is substantially constant.

The wall surface forming the 1 st space 42 is referred to as a 1 st wall surface 43. The 1 st wall surface 43 is a curved surface formed along the circumferential direction of the 1 st space 42.

The 2 nd space 44 is a space connected to the downstream side of the 1 st space 42. The distal end 51 of the tubular member 50 is inserted into the 2 nd space 44. The fiber bundle 8 passing through the 1 st space 42 does not enter the 2 nd space 44, but passes through a fiber path inside the cylindrical member 50 inserted into the 2 nd space 44. The 2 nd space 44 is a space including a cylindrical portion having a constant diameter. Specifically, the 2 nd space 44 includes a portion having a constant diameter and a portion having a varying diameter (a portion at the upstream end). The majority of the 2 nd space 44 is constant in diameter. That is, the portion having a constant diameter has a longer axial length than the portion having a varying diameter. In addition, the diameter changes discretely (sharply) at the boundary between the 1 st space 42 and the 2 nd space 44. The diameter of the 2 nd space 44 is, for example, 2 times or more or 3 times or more as compared with the diameter of the 1 st space 42.

The wall surface forming the 2 nd space 44 is referred to as a 2 nd wall surface 45. Since the boundary diameter between the 1 st space 42 and the 2 nd space 44 varies discretely, the 2 nd wall surface 45 includes an abutment surface 45 a. The contact surface 45a is a surface perpendicular to the fiber passage direction (axial direction of the hollow guide shaft body 40), and is a surface for positioning by contacting the distal end portion 51 of the tubular member 50. The 2 nd wall surface 45 further includes a side surface 45b along the circumferential direction of the 2 nd space 44. The contact surface 45a and the side surface 45b are connected by a wall surface of a curve protruding outward in a cross section cut along a surface parallel to the axial direction of the hollow guide shaft body 40.

The 3 rd space 46 is a space connected to the downstream side of the 2 nd space 44. The 3 rd space 46 is formed by axially stacking cylindrical and truncated cone shaped spaces. At the boundary between the 2 nd space 44 and the 3 rd space 46, the diameter gradually changes. A tubular member 50 is inserted into the 3 rd space 46. After the tubular member 50 is attached, a part of the 3 rd space 46 serves as a path for supplying an air flow to the auxiliary nozzle 56. The 3 rd space 46 has a larger diameter than the 2 nd space 44.

The wall surface forming the 3 rd space 46 is referred to as a 3 rd wall surface 47. In the hollow guide shaft body 40 of the present embodiment, the 2 nd wall surface 45 and the 3 rd wall surface 47 are connected. In more detail, the 2 nd wall surface 45 and the 3 rd wall surface 47 are smoothly connected. "smoothly connected" means that the inclination of the curved surface changes continuously and not discretely. Therefore, the 3 rd wall surface 47 is formed with almost or no surface perpendicular to the fiber moving direction. Specifically, the 3 rd wall surface 47 includes an arc portion 47a, a tapered portion 47b, and a downstream curved surface portion 47 c.

The arc 47a connects the downstream end of the 2 nd wall surface 45 and the upstream end of the tapered portion 47 b. The arcuate portion 47a is a wall surface formed in an arc shape in a cross section (fig. 5) cut along a surface parallel to the fiber passing direction (axial direction of the hollow guide shaft body 40). The arcuate portion 47a includes a curved surface (curved surface bulging inward) protruding toward the center shaft side (inner side) of the hollow guide shaft body 40. In other words, in this cross section, the arcuate portion 47a is located on the side (inside) closer to the central axis of the hollow guide shaft body 40 than the imaginary line connecting the downstream end of the 2 nd wall surface 45 and the upstream end of the tapered portion 47 b. As shown in this cross section, the inclination of the arcuate portion 47a (change in the orientation of the wall surface in this cross section) gradually changes. Therefore, the arcuate portion 47a is a portion smoothly connecting the 2 nd space 44 and the 3 rd space 46.

The tapered portion 47b is a portion connected to the downstream side of the arcuate portion 47 a. In the cross section (fig. 5), the tapered portion 47b is a linear wall surface inclined so as to increase in diameter as it approaches the downstream side. In this cross section, the tapered portion 47b is not limited to a straight line and may include a curved line. In other words, the amount of change in diameter when quantitatively moving in the fiber passage direction may or may not be constant. Since the tapered portion 47b is formed, a space (air reservoir) can be provided around the auxiliary nozzle 56 of the tubular member 50.

The downstream curved surface portion 47c is a portion connected to the downstream side of the tapered portion 47 b. In the above cross section (fig. 5), the downstream curved surface portion 47c is a portion whose diameter hardly or completely does not change as it approaches the downstream side. The downstream curved surface portion 47c can be omitted depending on the shape of the tapered portion 47 b.

In the prior art disclosed in patent document 2 and the like, since the diameters of the 2 nd space and the 3 rd space vary discretely, there is a plane perpendicular to the fiber passing direction. In this prior art, the 2 nd wall surface and the 3 rd wall surface are not smoothly connected and have edges and corners. That is, the orientation of the wall surface in the sectional view changes sharply (90 °). Therefore, in the structure of the prior art 2, when the tubular member is inserted, the tubular member may collide with a surface perpendicular to the fiber passing direction, and the tubular member may be damaged. In particular, when the tubular member hits against the angular portion of the hollow guide shaft body, the tubular member is more likely to be broken.

In contrast, in the present embodiment, the diameter of the 3 rd space 46 gradually changes along the fiber passing direction at the boundary between the 2 nd space 44 and the 3 rd space 46, and the side surface 45b of the 2 nd wall surface 45 is connected to the tapered portion 47b via the arc-shaped portion 47 a. Therefore, no plane perpendicular to the fiber passing direction is formed at the boundary portion between the 2 nd space 44 and the 3 rd space 46. Further, since the 2 nd wall surface 45 and the 3 rd wall surface 47 are smoothly connected by the arc 47a, there is no angular portion. Therefore, the tubular member 50 is not easily broken when the tubular member 50 is inserted.

In particular, in the present embodiment, the tubular member 50 and the hollow guide shaft body 40 can be smoothly assembled to form the hollow guide unit 100 by inserting the tubular member 50 into the hollow guide shaft body 40 in the following order. Hereinafter, description will be given with reference to fig. 6.

First, as shown in the upper left and upper right views of fig. 6, the operator inserts the tubular member 50 into the hollow guide shaft body 40 to bring the distal end portion 51 into contact with the 3 rd wall surface 47 (specifically, the tapered portion 47b) (step 1). Since the tapered surface is formed at the distal end of the distal end portion 51, the distal end portion 51 and the tapered portion 47b come into surface contact with each other. Therefore, the load applied to the distal end portion 51 can be dispersed, and the distal end portion 51 is less likely to be broken.

Next, as shown in the upper right diagram of fig. 6, the operator slides the distal end portion 51 to the upstream side along the tapered portion 47b (step 2). Then, as shown in the lower right of fig. 6, the operator sets the tip portion 51 in the 2 nd space 44 (the 3 rd step). The tip portion 51 passes through the boundary between the 2 nd wall surface 45 and the 3 rd wall surface 47, but since the boundary has no corner in the present embodiment, damage to the tip portion 51 can be avoided.

Unlike the present embodiment, when the distal end portion 51 is provided in the 2 nd space 44 without contacting the tapered portion 47b, high accuracy is required for the position of the tubular member 50. When the position of the tubular member 50 is deviated, an impact is applied to the distal end portion 51. Therefore, the tip end portion 51 is first brought into contact with the tapered portion 47b as described above, so that it is possible to minimize the impact applied to the tip end portion 51 and assemble the cylindrical member 50 to the hollow guide shaft body 40.

Next, preferred dimensions of each part of the hollow guide shaft body 40 and the tubular member 50 will be described with reference to fig. 7.

The length of the 2 nd space 44 in the fiber moving direction is referred to as a length L1 as shown in fig. 7. The length L1 is preferably a value within a specified range. If the length L1 is too short, the O-ring 55 may not sufficiently contact the side surface 45b when the cylindrical member 50 is inserted, and the sealing performance may be degraded. Further, since the contact area between the inserted tubular member 50 and the 2 nd space 44 is small, there is a possibility that the tubular member 50 is not easily stabilized. On the other hand, if the length L1 is too long, the auxiliary nozzle 56 may be located in or near the 2 nd space 44 and may not generate a sufficient swirling airflow. Therefore, the length L1 is preferably 0.8mm or more and 2.7mm or less, for example, although depending on the structure of the tubular member 50. The lower limit of the length L1 is more preferably 1.0mm, 1.7mm or 1.9 mm. The upper limit value of the length L1 is more preferably 2.5mm or 2.2 mm. The appropriate range of the length L1 can be set by arbitrarily combining the lower limit value and the upper limit value.

In a state where the cylindrical member 50 is disposed in the 2 nd space 44, a length (a length in the fiber moving direction) from the downstream end of the O-ring groove 54 to the upstream end of the arc portion 47a is referred to as a length L2. If the length L2 is too short, the O-ring 55 may not sufficiently contact the side surface 45b, and the sealing performance may be reduced. On the other hand, if the length L2 is too long, the auxiliary nozzle 56 may be located in or near the 2 nd space 44 and may not generate a sufficient swirling airflow. Therefore, the length L2 is preferably 0mm or more and 1.0mm or less, for example, although depending on the structure of the tubular member 50. The length L2 is more preferably 0mm to 0.7mm, or 0.2mm to 0.5 mm. When the length L2 is 0mm or more, the "O-ring groove 54 is inevitably positioned on the 1 st space 42 side of the arcuate portion 47 a".

In a state where the tubular member 50 is disposed in the 2 nd space 44, a length from the end of the auxiliary nozzle 56 on the 3 rd space 46 side to the 3 rd wall surface 47 (a length along the radial direction of the 3 rd space 46) is referred to as a length L3. The "end of the auxiliary nozzle 56 on the 3 rd space 46 side" can also be expressed as the position of the air suction port of the auxiliary nozzle 56. The cross section of the flow path of the sub-nozzle 56 of the present embodiment is circular, and the length L3 is the length at the axial center of the sub-nozzle 56. The diameter of the auxiliary nozzle 56 is referred to as the length L4. If the length L3 is too small, there is a possibility that the compressed air cannot be sufficiently supplied to the sub-nozzle 56. Therefore, the length L3 is preferably equal to or greater than the length L4.

The angle formed by the tapered portion 47b with respect to the fiber passing direction (or with respect to the outer surface of the cylindrical member 50) is referred to as an angle θ. When the angle θ is too large, the force (reaction force) applied to the distal end portion 51 when the distal end portion 51 contacts the tapered portion 47b is likely to increase when the tubular member 50 is inserted. On the other hand, even if the tip end portion 51 contacts the tapered portion 47b, the smaller the angle θ, the more easily the tip end portion 51 moves downstream along the tapered portion 47 b. Therefore, the angle θ is preferably 45 ° or less. The angle θ is more preferably 42 ° or less. The smaller the angle θ, the better, but for example, 20 °, preferably 35 °, can be cited as the lower limit.

In the present embodiment, the angle formed by the surface (outer surface) on the opposite side of the tapered portion 47b with respect to the fiber movement direction is smaller than the angle θ. Therefore, the thickness of the hollow guide shaft body 40 is not constant in the range where the tapered portion 47b is formed. In detail, since the thickness of the portion where the arc portion 47a is formed is larger than that of the related art, the strength of the portion can be improved.

The radius of curvature of the arcuate portion 47a is referred to as a radius of curvature R. When the curvature radius R is too large, the length L1 or the length L3 may become too small. When the radius of curvature R is too small, the distal end portion 51 (particularly, the O-ring 55) is easily broken when the distal end portion 51 contacts. Therefore, the radius of curvature R is preferably 0.3mm to 3 mm. The radius of curvature R is more preferably 0.3mm to 2mm, or 0.3mm to 1.5 mm.

As described above, the hollow guide shaft body 40 for open-end spinning according to the above embodiment has the 1 st wall surface 43, the 2 nd wall surface 45, and the 3 rd wall surface 47. The 1 st wall surface 43 is connected to the inlet 41 through which the fibers (fiber bundle 8) are introduced, and forms the 1 st space 42. The 2 nd wall surface 45 is connected to the downstream side of the 1 st wall surface 43 in the fiber passing direction, and forms a 2 nd space 44 having a diameter larger than the 1 st space 42 and a constant diameter. The 3 rd wall surface 47 is connected to the downstream side of the 2 nd wall surface 45 in the fiber passing direction, and forms a 3 rd space 46 having a diameter larger than that of the 2 nd space 44. The 3 rd wall surface 47 has an arc-shaped portion 47a and a tapered portion 47 b. The arcuate portion 47a is formed at the end portion on the 2 nd wall surface 45 side, includes a curved surface bulging toward the inside of the 3 rd space 46, and is smoothly connected to the 2 nd wall surface 45. The tapered portion 47b is connected to the arcuate portion 47a, and the diameter thereof increases toward the downstream side in the fiber passage direction.

Thus, since the 3 rd wall surface 47 has the arcuate portion 47a and the tapered portion 47b, when the tubular member 50 is inserted into the hollow guide shaft body 40, the tubular member 50 can be prevented from strongly hitting the inner wall of the hollow guide shaft body 40. Therefore, the tubular member 50 can be made less susceptible to breakage.

In the hollow guide shaft body 40 of the above embodiment, no surface perpendicular to the fiber passing direction is formed at the boundary portion between the 2 nd space 44 and the 3 rd space 46, and no angular portion is present. Therefore, when the tubular member 50 is inserted into the hollow guide shaft body 40, the tubular member 50 is not easily broken.

In the hollow guide shaft body 40 of the above embodiment, the radius of curvature R of the arcuate portion 47a is 0.3mm to 3 mm.

Thus, since the arcuate portions 47a are sufficiently smooth, the cylindrical member 50 is not easily broken even if the cylindrical member 50 hits the arcuate portions 47 a.

In the hollow guide shaft body 40 of the above embodiment, the radius of curvature of the arcuate portion 47 is preferably 0.3mm to 2 mm. Therefore, the tubular member 50 can be further made less susceptible to breakage.

In the hollow guide shaft body 40 of the above embodiment, the radius of curvature of the arcuate portion 47 is more preferably 0.3mm to 1.5 mm. Therefore, the tubular member 50 can be further made less susceptible to breakage.

In the hollow guide shaft body 40 of the above embodiment, the length L1 of the 2 nd space 44 in the fiber passage direction is 0.8mm to 2.7 mm.

Thus, when the tubular member 50 is inserted into the 2 nd space 44, the tubular member 50 can be sufficiently stabilized.

In the hollow guide shaft body 40 of the above embodiment, the lower limit value of the length L1 of the 2 nd space 44 is preferably 1.0mm, 1.7mm, or 1.9 mm. This makes it possible to further stabilize the tubular member 50 when the tubular member 50 is inserted into the 2 nd space 44.

In the hollow guide shaft body 40 of the above embodiment, the upper limit value of the length L1 of the 2 nd space 44 is preferably 2.5mm or 2.2 mm. Therefore, when the tubular member 50 is inserted into the 2 nd space 44, the tubular member 50 can be further stabilized.

In the hollow guide shaft body 40 of the above embodiment, the 2 nd space 44 includes a columnar space, and in a cross section taken on a plane parallel to the central axis of the 2 nd space 44, an angle θ formed by the central axis and the tapered portion 47b is 45 ° or less.

Thus, even if the cylindrical member 50 comes into contact with the tapered portion 47b, the cylindrical member 50 can be guided toward the guide inlet 41 with little impact applied to the cylindrical member 50. When the angle θ is 45 ° or less, the thickness of the hollow guide shaft body 40 may be increased when the angle on the outer surface side of the hollow guide shaft body 40 is less than 45 °. As a result, the degree of freedom in designing the outer shape of the hollow guide shaft body 40 is improved, and therefore, for example, the hollow guide shaft body 40 can be downsized.

The hollow guide unit 100 of the above embodiment has the hollow guide shaft body 40 and the tubular member 50. The tubular member 50 is provided in the 2 nd space 44 and the 3 rd space 46 of the hollow guide shaft body 40.

This makes it possible to realize the hollow guide unit 100 in which the tubular member 50 is not easily broken.

In the hollow guide unit 100 of the above embodiment, the O-ring groove 54 for attaching the O-ring 55 is formed on the outer surface of the cylindrical member 50. An O-ring 55 is attached to the O-ring groove 54. The O-ring groove 54 is located closer to the 1 st space 42 than the arcuate portion 47a in the fiber passing direction.

Thus, even when the O-ring 55 hits the arc-shaped portion 47a, the O-ring 55 is not easily broken because the arc-shaped portion 47a is not sharp. Further, the portion where the O-ring groove 54 is formed has low strength, but since this portion is covered with the 2 nd space 44, the cylindrical member 50 is less likely to be broken or the like.

In the hollow guide unit 100 of the above embodiment, the length L2 from the upstream end of the arcuate portion 47a to the downstream end of the O-ring groove 54 is 0mm to 1.0mm in the fiber passage direction.

Thus, since the O-ring 55 is provided in the entire 2 nd space 44, the 1 st space 42 can be reliably sealed from the 3 rd space 46 by the O-ring 55.

In the hollow guide shaft body 40 of the above embodiment, the length L2 from the upstream end of the arc 47a to the downstream end of the O-ring groove 54 is preferably 0mm to 0.7 mm. Therefore, the 1 st space 44 can be reliably sealed from the 3 rd space 46 by the O-ring 55.

In the hollow guide shaft body 40 of the above embodiment, the length L2 from the upstream end of the arc 47a to the downstream end of the O-ring groove 54 is preferably 0.2mm to 0.5 mm. The 1 st space 44 can be more reliably sealed from the 3 rd space 46 by the O-ring 55.

In the hollow guide unit 100 of the above embodiment, a fiber path is formed inside the tubular member 50. The cylindrical member 50 is provided with an auxiliary nozzle 56 having a circular cross-section for connecting the fiber passage and the 3 rd space 46. In the radial direction of the 3 rd space 46, a length L3 from the end of the auxiliary nozzle 56 on the 3 rd space 46 side to the 3 rd wall surface 47 is equal to or greater than the diameter (length L4) of the auxiliary nozzle 56.

This can ensure a sufficient cross-sectional area of the flow path from the 3 rd space 46 to the sub-nozzle 56, and therefore a sufficient flow rate can be ensured.

The method of manufacturing the hollow guide unit 100 according to the above embodiment includes the 1 st step, the 2 nd step, and the 3 rd step. In the step 1, the cylindrical member 50 is brought into contact with the tapered portion 47b of the hollow guide shaft body 40. In the 2 nd step, the tubular member 50 in contact with the tapered portion 47b is moved along the tapered portion 47b to the 2 nd space 44. In the 3 rd step, the cylindrical member 50 is provided in the 2 nd space 44.

Since the 2 nd space 44 and the 3 rd space 46 of the hollow guide shaft body 40 are smoothly connected by the arcuate portion 47a, even if the tubular member 50 is moved along the tapered portion 47b, the tubular member 50 can be disposed in the 2 nd space 44 without giving a large impact to the tubular member 50. Therefore, the tubular member 50 can be made less susceptible to breakage.

While the preferred embodiments of the present invention have been described above, the above configuration can be modified to the following embodiments, for example. The above embodiments and the following modifications may be combined as appropriate.

The yarn guide needle 31b may be omitted and the function of the yarn guide needle 31b may be realized by the downstream end of the fiber guide part 31.

Instead of or in addition to the yarn accumulating device 14, a feed roller that is rotationally driven and a pinch roller that is pressed against the feed roller may be provided at a position downstream of the air-jet spinning device 9, and the spun yarn 10 may be fed downstream while being pinched between the delivery roller and the pinch roller.

In the above embodiment, the fiber guide 31 and the nozzle block 30 are illustrated as separate members, but may be formed of a single member.

The spinning machine 1 may be provided with a yarn joining device 93, a suction pipe 94, and a suction nozzle 95 in each spinning unit 2 without the yarn joining cart 3. The draft device 7 and/or the winding device 96 may be driven independently for each spinning unit 2.

In the spinning unit 2, each device is provided so that the fiber passage direction is directed from the upper side to the lower side, but each device may be provided so that the fiber passage direction is directed from the lower side to the upper side.

Claims (16)

1. A hollow guide shaft body for an air-jet spinning machine, comprising:

a 1 st wall surface connected to an inlet for introducing the fiber to form a 1 st space;

a 2 nd wall surface connected to a downstream side in a fiber passing direction of the 1 st wall surface to form a 2 nd space, the 2 nd space having a constant diameter and a larger diameter than the 1 st space; and

a 3 rd wall surface connected to a downstream side in a fiber passing direction of the 2 nd wall surface to form a 3 rd space having a diameter larger than that of the 2 nd space,

the 3 rd wall surface has:

an arc-shaped portion formed at an end portion on the 2 nd wall surface side, including a curved surface bulging toward the inside of the 3 rd space, and connected to the 2 nd wall surface; and

and a tapered portion connected to the arcuate portion, the tapered portion having a diameter that increases toward a downstream side in a fiber passage direction.

2. The hollow guide shaft body according to claim 1,

at the boundary between the 2 nd space and the 3 rd space, neither a plane perpendicular to the fiber passing direction nor a portion having an angular shape is formed.

3. The hollow guide shaft body according to claim 1,

the curvature radius of the arc part is more than 0.3mm and less than 3 mm.

4. The hollow guide shaft body according to claim 3,

the curvature radius of the arc-shaped portion is 0.3mm or more and 2mm or less.

5. The hollow guide shaft body according to claim 4,

the curvature radius of the arc-shaped portion is 0.3mm to 1.5 mm.

6. A hollow guide shaft body according to any one of claims 1 to 5,

the length of the 2 nd space in the fiber passing direction is 0.8mm to 2.7 mm.

7. The hollow guide shaft body according to claim 6,

the lower limit value of the length of the 2 nd space is 1.0mm, 1.7mm, or 1.9 mm.

8. The hollow guide shaft body according to claim 6,

an upper limit value of the length of the 2 nd space is 2.5mm or 2.2 mm.

9. A hollow guide shaft body according to any one of claims 1 to 5,

the 2 nd space includes a cylindrical space, and in a cross section cut along a plane parallel to a central axis of the 2 nd space,

an angle formed by the central axis and the tapered portion is 45 ° or less.

10. The hollow guide shaft body according to claim 9,

the lower limit value of the angle formed by the central axis and the tapered portion is 20 ° or more.

11. A hollow guide unit, characterized by having:

a hollow guide shaft body according to any one of claims 1 to 10; and

and a hollow cylindrical member disposed in the 2 nd space and the 3 rd space of the hollow guide shaft body.

12. The hollow guide unit of claim 11,

an O-ring groove for mounting an O-ring is formed on the outer surface of the cylindrical member,

the O-shaped ring is arranged in the O-shaped ring groove,

the O-ring groove is located closer to the 1 st space than the arcuate portion in the fiber passing direction.

13. The hollow guiding unit of claim 12,

the length from the upstream end of the arcuate portion to the downstream end of the O-ring groove in the fiber passage direction is 0mm to 1.0 mm.

14. The hollow guiding unit of claim 13,

the length from the upstream end of the arcuate portion to the downstream end of the O-ring groove is 0mm or more and 0.7mm or less.

15. The hollow guiding unit of claim 14,

the length from the upstream end of the arcuate portion to the downstream end of the O-ring groove is 0.2mm to 0.5 mm.

16. The hollow guide unit according to any one of claims 12 to 15,

a fiber path is formed inside the cylindrical member,

a nozzle having a circular cross-section of a flow path connecting the fiber path and the 3 rd space is formed in the cylindrical member,

the length from the end of the nozzle on the 3 rd space side to the 3 rd wall surface in the radial direction of the 3 rd space is equal to or greater than the diameter of the nozzle.

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