JP2024036746A - Fiber guide, air spinning device, and air spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber guide capable of reducing the amount of fiber waste generated, and guiding a fiber bundle while suitably converging the same.

SOLUTION: There is provided a fiber guide 101 that is configured in that: a first cross section which is obtained by cutting a twisted passage 111 along a plane parallel to an axial direction includes a first inner wall line WL1 corresponding to a first inner wall plane 141a and a second inner wall line WL2 corresponding to a third inner wall plane 141c; a distance between a first upstream end point AU1, which corresponds to an upstream end of the twisted passage 111 on the first inner wall line WL1, and a second upstream end point AU2, which corresponds to an upstream end on the second inner wall line WL2, is longer than a distance between a first downstream end point AD1, which corresponds to a downstream end of the twisted passage 111 on the first inner wall line WL1, and a second downstream end point AD2, which corresponds to a downstream end on the second inner wall line WL2; and a first virtual straight line VL1 connecting the first upstream end point AU1 and the first downstream end point AD1 is inclined at an inclination angle of 25° or more and 70° or less with respect to the axial direction of the fiber guide 101.

SELECTED DRAWING: Figure 6

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a fiber guide used in an air spinning device. In particular, the present invention relates to the configuration of fiber passages in a fiber guide.

2. Description of the Related Art Air spinning devices have been known that generate spun yarn by twisting fibers by the action of swirling airflow formed in a spinning chamber. This air spinning device may be provided with a fiber guide for guiding the fibers to the spinning chamber. Patent Document 1 discloses an air spinning device including a fiber guide.

A linear passage is formed inside the fiber guide of Patent Document 1. The fiber bundle can pass through this passage. A flat planar portion is formed between the upstream end and the downstream end of the passage. The flat portion is arranged along the direction in which the passage extends.

JP 2021-42508 Publication

Regarding the above-mentioned fiber guide, there has been a desire for one that can guide the fiber bundle while converging it more appropriately.

The present invention has been made in view of the above circumstances, and its purpose is to provide a fiber guide that can reduce the amount of fiber waste generated and can guide fiber bundles while suitably converging them.

Means and effects for solving problems

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

According to a first aspect of the present invention, a fiber guide having the following configuration is provided. That is, a fiber passage is formed inside this fiber guide. A first cross section of the fiber passage taken along a plane parallel to the axial direction of the fiber guide includes a first inner wall line and a second inner wall line. The first inner wall line corresponds to an inner wall surface on one side of the fiber passage. The second inner wall line corresponds to an inner wall surface opposite to the inner wall surface. A distance between a first upstream end point corresponding to the upstream end of the fiber passage on the first inner wall line and a second upstream end point corresponding to the upstream end of the fiber passage on the second inner wall line. is between a first downstream end point corresponding to the downstream end of the fiber passage on the first inner wall line and a second downstream end point corresponding to the downstream end of the fiber passage on the second inner wall line. longer than the distance of At least one of a first virtual straight line connecting the first upstream end point and the first downstream end point and a second virtual straight line connecting the second upstream end point and the second downstream end point of the fiber guide It is inclined at an inclination angle of 25° or more and 70° or less with respect to the axial direction.

Thereby, it is possible to construct a fiber passageway that can guide the fibers to the downstream side while suitably converging them.

In the fiber guide, it is preferable that at least one of the first virtual straight line and the second virtual straight line is inclined at an inclination angle of 30° or more and 50° or less with respect to the axial direction of the fiber guide. .

Thereby, it is possible to configure a fiber passageway that can guide the fibers to the downstream side while converging them more suitably.

It is preferable that the fiber guide described above has the following configuration. That is, the first inner wall line is formed in a straight line connecting the first upstream end point and the first downstream end point. The second inner wall line is formed in a straight line connecting the second upstream end point and the second downstream end point.

Thereby, the fibers can be smoothly guided downstream.

In the fiber guide, the angle that the first virtual straight line makes with the axial direction of the fiber guide is different from the angle that the second virtual straight line makes with the axial direction of the fiber guide. It is preferable.

Thereby, it is possible to improve the degree of freedom in the shape of the path through which the fibers pass.

It is preferable that the fiber guide described above has the following configuration. That is, the first virtual straight line is inclined with respect to the axial direction of the fiber guide at an inclination angle of 25° or more and 70° or less. The second imaginary straight line is parallel to the axial direction of the fiber guide or is inclined at an inclination angle of less than 25°.

Thereby, the fibers can be guided to the downstream side while converging suitably.

It is preferable that the fiber guide described above has the following configuration. That is, at a position where the axial length of the fiber passage is divided into two, a cross section of the fiber passage taken by a plane perpendicular to the axial direction of the fiber guide has a bent portion. The fiber passage located near the cross section has a first portion having a small dimension perpendicular to the first cross section and a second portion having a large dimension perpendicular to the first cross section, with the bent portion as a boundary. has. The first virtual straight line is closer to the first portion than the second virtual straight line.

Thereby, the fibers can be transferred from the first portion to the second portion via the bending portion, and the fibers can be guided downstream while converging suitably.

According to a second aspect of the present invention, a fiber guide having the following configuration is provided. That is, a fiber passage is formed inside this fiber guide. In the fiber guide, a second cross section of the fiber passage taken along a plane parallel to the axial direction includes a third inner wall line and a fourth inner wall line. The third inner wall line corresponds to an inner wall surface on one side of the fiber passage. The fourth inner wall line corresponds to an inner wall surface opposite to the inner wall surface. A distance between a third upstream end point corresponding to the upstream end of the fiber passage on the third inner wall line and a fourth upstream end point corresponding to the upstream end of the fiber passage on the fourth inner wall line. is between a third downstream end point corresponding to the downstream end of the fiber passage on the third inner wall line and a fourth downstream end point corresponding to the downstream end of the fiber passage on the fourth inner wall line. shorter than the distance. At least one of a third imaginary straight line connecting the third upstream end point and the third downstream end point and a fourth imaginary straight line connecting the fourth upstream end point and the fourth downstream end point of the fiber guide It is inclined at an inclination angle of 35° or more and 85° or less with respect to the axial direction.

As a result, it is possible to realize a configuration in which the inner wall surface of the fiber passage hardly inhibits the fibers from turning over due to air spinning performed downstream of the fiber passage.

In the fiber guide, at least one of the third virtual straight line and the fourth virtual straight line may be inclined at an inclination angle of 40° or more and 70° or less with respect to the axial direction of the fiber guide. preferable.

As a result, it is possible to realize a configuration in which the inner wall surface of the fiber path is less likely to inhibit the fibers from turning over due to air spinning performed downstream of the fiber path.

It is preferable that the fiber guide described above has the following configuration. That is, the upstream opening located at the upstream end of the fiber passage is offset to one side with respect to the axis of the fiber guide. Among the inner wall surfaces of the fiber passage, the inner wall surface located on the opposite side to the direction in which the upstream opening is offset with respect to the axis of the fiber guide includes one or more planes.

Thereby, the fibers can be appropriately guided downstream by the inner wall surface.

It is preferable that the fiber guide described above has the following configuration. That is, the fiber guide has an upstream end surface and a downstream end surface. An upstream opening located at an upstream end of the fiber passage is formed in the upstream end surface. A downstream opening located at the downstream end of the fiber passage is formed in the downstream end surface. The length between the upstream end face and the downstream end face is 1 mm or more and 5 mm or less.

This allows the fiber guide to be downsized.

It is preferable that the fiber guide described above has the following configuration. That is, a spinning nozzle and a swirling chamber are integrally formed in this fiber guide. The spinning nozzle blows out air passing through it. In the swirling chamber, a swirling air flow formed by air ejected from the spinning nozzle acts on the fibers.

Thereby, the number of parts can be reduced.

It is preferable that the fiber guide described above has the following configuration. That is, the fiber guide includes a chamfered portion. The chamfered portion is formed between an upstream end face in which an upstream opening is formed and located at an upstream end of the fiber passage, and a side surface. The angle of inclination of the chamfered portion with respect to the axial direction of the fiber guide is 50° or more and 70° or less.

This allows the fiber guide to be placed close to the draft roller of the draft device.

According to a third aspect of the present invention, an air spinning device having the following configuration is provided. That is, this air spinning device includes the fiber guide and a hollow guide shaft. The hollow guide shaft guides the fibers twisted by the air ejected from the spinning nozzle to the downstream side.

Thereby, the fibers are converged in a suitable manner in the fiber passage and guided to the downstream side, and spinning is performed using the air flow, so that yarn with good physical properties can be produced. Furthermore, fiber loss caused by fibers falling off without being spun during the air spinning process can be reduced.

According to a fourth aspect of the present invention, an air spinning machine having the following configuration is provided. That is, this air spinning machine includes the air spinning device, a drawing device, and a winding device. The drawing device draws out the yarn spun by the air spinning device. The winding device winds up the yarn drawn out by the drawing device.

This makes it possible to wind yarn with good physical properties and to realize an air spinning machine with less fiber loss.

1 is a front view showing the overall configuration of an air spinning machine including an air spinning device according to an embodiment of the present invention. FIG. 3 is a side view showing a spinning unit and a yarn splicing cart. FIG. 1 is a cross-sectional view schematically showing the configuration of a spinning device. FIG. 3 is a perspective view showing the configuration of a fiber guide. A view of the fiber guide viewed from the upstream side along the axial direction. The figure which shows the 1st cross section of a fiber guide. The figure which shows the 2nd cross section of a fiber guide. A diagram showing a cross section of a fiber guide. FIG. 3 is a cross-sectional view showing a modified example of the fiber guide. The figure which shows the modification of a fiber guide. The figure which shows the modification of a fiber guide.

Next, an air spinning machine 1 including an air spinning device 23 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the air spinning machine 1 includes a blower box 3, a prime mover box 5, a plurality of spinning units 7, and a yarn splicing cart 9. The plurality of spinning units 7 are arranged side by side in a predetermined direction.

Inside the blower box 3, a blower 11 and the like that function as a negative pressure source are arranged.

In the prime mover box 5, a drive source (not shown), a central control device 13, a display section 15, and an operation section 17 are arranged. The drive source provided in the prime mover box 5 includes a motor that is commonly used by a plurality of spinning units 7.

The central control device 13 centrally manages and controls each part of the air spinning machine 1. As shown in FIG. 2, each spinning unit 7 includes a unit control section 19. The central control device 13 is connected to each spinning unit 7 via an unillustrated signal line. In this embodiment, each spinning unit 7 includes a unit control section 19, but a predetermined number (for example, two or four) of spinning units 7 may be controlled by one unit control section 19.

The display unit 15 can display the settings for the spinning units 7 and/or information regarding the status of each spinning unit 7.

Each spinning unit 7 mainly includes a draft device 21, an air spinning device 23, a yarn storage device 25, and a winding device 27, which are arranged in order from upstream to downstream. "Upstream" and "downstream" herein mean upstream and downstream in the traveling direction of the sliver 32, the fiber bundle 34, and the spun yarn 30 when the spun yarn (yarn) 30 is wound up.

The draft device 21 is provided near the upper end of a frame 36 included in the air spinning machine 1. As shown in FIG. 2, the draft device 21 includes four draft roller pairs. The four draft roller pairs are a back roller pair 41, a third roller pair 43, a middle roller pair 45, and a front roller pair 47, which are arranged in order from upstream to downstream. In the middle roller pair 45, an apron belt 49 is provided for each roller.

The draft device 21 draws the sliver 32 supplied from a sliver case (not shown) until it reaches a predetermined fiber amount (or thickness) by sandwiching and conveying the sliver 32 between the rollers of each draft roller pair. drafting) to produce a fiber bundle 34. The fiber bundle 34 generated by the draft device 21 is supplied to the air spinning device 23.

The air spinning device 23 applies a swirling air flow to the fiber bundle 34 generated by the draft device 21 to twist the fiber bundle 34 to generate a spun yarn 30 . The detailed configuration of the air spinning device 23 will be described later.

The spun yarn 30 produced by the air spinning device 23 is supplied to the yarn storage device 25 . As shown in FIG. 2, the yarn accumulating device 25 includes a yarn accumulating roller (pull-out device) 53 and a motor 55.

The yarn storage roller 53 is rotationally driven by a motor 55. The yarn storage roller 53 winds the spun yarn 30 around its outer peripheral surface and temporarily stores it. The yarn storage roller 53 rotates at a predetermined rotational speed with the spun yarn 30 wound around its outer peripheral surface, thereby drawing out the spun yarn 30 from the air spinning device 23 at a predetermined speed and conveying it to the downstream side.

In this way, the yarn storage device 25 can temporarily store the spun yarn 30 on the outer peripheral surface of the yarn storage roller 53, and thus functions as a kind of buffer for the spun yarn 30. As a result, problems caused by the spinning speed in the air spinning device 23 and the winding speed (travel speed of the spun yarn 30 wound around the package 73 described later) not matching for some reason (for example, the slackness of the spun yarn 30) etc.) can be resolved.

A yarn monitoring device 59 is provided between the air spinning device 23 and the yarn storage device 25. The spun yarn 30 produced by the air spinning device 23 passes through a yarn monitoring device 59 before being stored by the yarn storage device 25.

The yarn monitoring device 59 monitors the quality of the traveling spun yarn 30 using an optical sensor and detects yarn defects contained in the spun yarn 30. Examples of yarn defects include an abnormality in the thickness of the spun yarn 30 and foreign matter contained in the spun yarn 30. When the yarn monitoring device 59 detects a yarn defect in the spun yarn 30, it transmits a yarn defect detection signal to the unit control section 19. The yarn monitoring device 59 may monitor the quality of the spun yarn 30 using, for example, a capacitive sensor instead of an optical sensor. Instead of or in addition to these examples, the yarn monitoring device 59 may be configured to measure the tension of the spun yarn 30 as the quality of the spun yarn 30.

Upon receiving the yarn defect detection signal from the yarn monitoring device 59, the unit control section 19 cuts the spun yarn 30 by stopping the driving of the air spinning device 23 and/or the drafting device 21. That is, the air spinning device 23 functions as a cutting section that cuts the spun yarn 30 when the yarn monitoring device 59 detects a yarn defect. Note that the spinning unit 7 may be provided with a cutter for cutting the spun yarn 30.

The winding device 27 includes a cradle arm 61, a winding drum 63, and a traverse guide 65. The cradle arm 61 is swingably supported around a support shaft 67, and can rotatably support a bobbin 71 (that is, a package 73) for winding up the spun yarn 30. The winding drum 63 rotates while in contact with the bobbin 71 or the outer circumferential surface of the package 73, thereby rotationally driving the package 73 in the winding direction. The winding device 27 drives the winding drum 63 by an electric motor (not shown) while reciprocating the traverse guide 65 by a driving means (not shown). Thereby, the winding device 27 winds the spun yarn 30 onto the package 73 while traversing the spun yarn 30.

As shown in FIG. 1, a rail 81 is arranged on the frame 36 of the air spinning machine 1 along the direction in which the plurality of spinning units 7 are lined up. The yarn splicing cart 9 is configured to be able to run on the rails 81. Thereby, the yarn splicing cart 9 can be moved relative to the plurality of spinning units 7. The yarn splicing cart 9 travels to the spinning unit 7 where yarn breakage or yarn cutting has occurred, and performs yarn splicing work on the spinning unit 7.

As shown in FIG. 1, the yarn splicing cart 9 includes running wheels 83, a yarn splicing device 85, a suction pipe 87, and a suction mouth 89. The yarn splicing cart 9 further includes a cart control section 91 shown in FIG.

The suction pipe 87 can capture the spun yarn 30 produced by the air spinning device 23 during yarn discharge spinning. Specifically, the suction pipe 87 can capture the spun yarn 30 sent out from the air spinning device 23 by suctioning it by generating a suction air flow at its tip. The suction mouth 89 is capable of capturing the spun yarn 30 wound onto the package 73 of the winding device 27 . Specifically, the suction mouth 89 can suction and capture the spun yarn 30 from the package 73 supported by the winding device 27 by generating a suction air flow at its tip. The suction pipe 87 and the suction mouth 89 rotate while capturing the spun yarn 30, thereby guiding the spun yarn 30 to a position where it can be introduced into the yarn splicing device 85.

The yarn splicing device 85 splices the spun yarn 30 from the air spinning device 23 guided by the suction pipe 87 and the spun yarn 30 from the package 73 guided by the suction mouth 89. In this embodiment, the yarn splicing device 85 is a splicer device that twists yarn ends together using a swirling air flow. The yarn splicing device 85 is not limited to the above-mentioned splicer device, and for example, a mechanical knotter or the like may be used.

The trolley control unit 91 shown in FIG. 2 is configured as a known computer having a CPU, ROM, RAM, etc. (not shown). The trolley control unit 91 controls the yarn splicing work performed by the yarn splicing trolley 9 by controlling the operation of each part of the thread splicing trolley 9 .

Next, with reference to FIG. 3, the configuration of the air spinning device 23 will be described in detail.

As shown in FIG. 3, the air spinning device 23 includes a fiber guide 101, a spindle (hollow guide shaft) 102, a nozzle block 103, and a needle member 104.

The fiber guide 101 has a shape in which a planar chamfer is formed on one axial side of a cylindrical member. The axis AL of the cylindrical member of the fiber guide 101 coincides with the axis of the spinning chamber 113, which will be described later. In this specification, the axial direction of the fiber guide 101 means the direction of the axis AL. The fiber guide 101 can be made of metal or ceramic, for example.

The fiber guide 101 is formed with a twisted path (fiber path) 111 through which the fiber bundle 34 can pass, and a through hole 112 extending along the axis AL. The twisting passage 111 is connected to a spinning chamber (swirling chamber) 113 for performing air spinning. A needle member 104 is attached to the through hole 112 .

A fiber bundle 34 generated by a draft device 21 is supplied to the fiber guide 101 . The fiber bundle 34 is introduced into the fiber guide 101 from the upstream end (upstream opening) 111a of the twisted passage 111, and is guided to the spinning chamber 113 via the downstream end (downstream opening) 111b. The fiber bundle 34 introduced into the fiber guide 101 is guided downstream so as to be wrapped around the needle member 104.

The fiber guide 101 includes a main body portion 115 formed in a block shape. The main body portion 115 is arranged such that its upstream end surface 115a faces the draft device 21 side, and its downstream end surface (bottom surface) 115b faces the spindle 102 side.

The fiber guide 101 constitutes a part of the spinning chamber 113. Specifically, the spinning chamber 113 is formed by arranging the downstream end surface 115b of the main body portion 115 to face the internal space of the nozzle block 103, which will be described later.

Spindle 102 is located downstream of fiber guide 101 . The spindle 102 is formed into an elongated round bar shape along the direction in which the fiber bundle 34 runs. The spindle 102 is arranged such that its upstream end surface 102a faces the fiber guide 101 with a spinning chamber 113 in between.

The spindle 102 has a spinning passage 122 through which the fiber bundle 34 that has passed through the twisting passage 111 is guided. The spinning passage 122 is connected to the spinning chamber 113. The spinning passage 122 is comprised of a circular hole 126 formed in the spindle 102. The spinning passage 122 extends linearly inside the spindle 102 along the longitudinal direction of the spindle 102 . An upstream end 122a of the spinning passage 122 opens to an upstream end surface 102a of the spindle 102. An upstream end 122a of the spinning passage 122 is arranged to face the needle member 104. The center of the spinning passage 122 coincides with the axis 108 of the spindle 102.

A conical tapered portion 124 is formed at the upstream end of the spindle 102 . The tapered portion 124 is formed such that its outer diameter decreases from the downstream side to the upstream side.

The spindle 102 forms part of a spinning chamber 113. Specifically, the spinning chamber 113 is formed by disposing the outer peripheral surface of the tapered portion 124 in the internal space of the nozzle block 103. The upstream end surface 102a of the spindle 102 is arranged at an appropriate distance from the main body 115 of the fiber guide 101.

The spinning chamber 113 is constituted by a space surrounded by a downstream end surface 115b of the main body portion 115 of the fiber guide 101, an outer peripheral surface of the tapered portion 124 of the spindle 102, and an inner surface 103a of the nozzle block 103, which will be described later. .

The upstream end 122a of the spinning passage 122 is arranged at an appropriate distance from the downstream opening 111b of the twisting passage 111 in the direction in which the fiber bundle 34 travels. The above-mentioned spinning chamber 113 is configured to include a portion of this interval.

After exiting from the downstream opening 111b of the twisting passage 111, the fiber bundle 34 enters the upstream end 122a of the spinning passage 122 via the spinning chamber 113. The fiber bundle 34 passes through the spinning passage 122 and is delivered to the outside of the air spinning device 23 .

The spindle 102 has a plurality of auxiliary nozzles (not shown). The plurality of auxiliary nozzles are arranged at equal intervals in the circumferential direction. By jetting compressed air into the spinning passage 122 from the plurality of auxiliary nozzles, a swirling air flow is generated within the spinning passage 122. When viewed in the direction along the axis 108 of the spindle 102, the direction of this swirling airflow is opposite to the swirling airflow generated by the spinning nozzle 131.

The nozzle block 103 is arranged downstream of the fiber guide 101. Nozzle block 103 is arranged to cover spindle 102. The nozzle block 103 can be made of metal or ceramic, for example. A gap is formed between the nozzle block 103 and the spindle 102 in the radial direction of the spindle 102.

A circular hole is formed in the nozzle block 103. The axis of this circular hole coincides with the axis 108 of the spindle 102. The inner surface 103a of the nozzle block 103 is formed to be circular when viewed in the direction of the axis 108 of the spindle 102.

The nozzle block 103 has a spinning nozzle 131 through which air can pass. The air spinning device 23 can blow air (compressed air) into the spinning chamber 113 from the spinning nozzle 131. The spinning nozzle 131 is formed as a through hole extending in a direction oblique to the axis 108 of the spindle 102. Although the spinning nozzle 131 is schematically depicted in FIG. 3, when viewed along the axis 108 of the spindle 102, the orientation of the spinning nozzle 131 coincides with the tangential direction of the inner surface 103a of the nozzle block 103. , slightly tilted. One longitudinal end of the spinning nozzle 131 is connected to an unillustrated compressed air supply section, and the other longitudinal end opens into the spinning chamber 113.

When compressed air is injected from the spinning nozzle 131 into the spinning chamber 113, a swirling air flow is generated in the spinning chamber 113. As shown in FIG. 3, the direction of the spinning nozzle 131 is inclined so that as it becomes downstream in the air injection direction, it becomes downstream in the traveling direction of the fiber bundle 34. Therefore, with the injection of compressed air from the spinning nozzle 131, a negative pressure is generated near the upstream end of the spinning chamber 113, and as a result, an air suction flow is generated at the upstream opening 111a of the fiber guide 101.

In this embodiment, a plurality of spinning nozzles 131 are formed in the nozzle block 103. The plurality of spinning nozzles 131 are arranged at regular intervals in the circumferential direction of the spinning chamber 113. However, the number of spinning nozzles 131 is not limited, and one or more may be arranged.

The air spinning device 23 can perform two types of spinning: normal spinning and yarn spinning. Normal spinning is spinning performed while winding the spun yarn 30 on the downstream side of the air spinning device 23. Yarn discharge spinning is temporary spinning performed before normal spinning, and is started when the spun yarn 30 has not come out from the air spinning device 23. Yarn release spinning is sometimes called self-spinning because the air spinning device 23 performs spinning simply by applying a swirling air flow.

When the air spinning device 23 performs yarn discharge spinning, compressed air is injected from the auxiliary nozzle before the spinning nozzle 131. Since the spinning passage 122 is formed such that the passage area increases as it goes downstream, a swirling air flow flowing downstream is formed in the spinning passage 122 by the injection of compressed air from the auxiliary nozzle. When the fiber bundle 34 is supplied from the drafting device 21 in this state, the fiber bundle 34 passes through the spinning chamber 113 from the twisting path 111 and is guided to the spinning path 122. Further, due to the action of the swirling air flow formed by the air injected from the auxiliary nozzle, some twist is added to the portion of the fiber bundle 34 that passes through the spinning passage 122.

Subsequently, compressed air is injected from the spinning nozzle 131 to form a swirling air flow in the spinning chamber 113. This swirling air flow acts on the portion of the fiber bundle 34 that passes through the spinning chamber 113.

The behavior of the fibers will be described below, focusing on the portion of the fiber bundle 34 that passes through the spinning chamber 113. The ends of the fibers constituting the fiber bundle 34 in this portion on the downstream side in the running direction are twisted and fixed to the core of the fiber bundle 34 inside the spinning passage 122. On the other hand, since the end on the upstream side in the running direction is not twisted, the free end moves away from the core part by the swirling airflow of the spinning chamber 113 and reverses its direction so as to follow the outer peripheral surface of the tapered part 124. Turn in the same position. As a result, the fibers are wound around the core, and the fiber bundle 34 is twisted, producing the spun yarn 30. The spun yarn 30 produced in this manner travels downstream by a swirling air flow formed by air injected from the auxiliary nozzle, and is sent out from the air spinning device 23.

In normal spinning, air is not injected from the auxiliary nozzle. In normal spinning, the spun yarn 30 is pulled out from the air spinning device 23 by the yarn storage roller 53, thereby realizing running of the spun yarn 30 from the air spinning device 23. The principle of normal spinning is basically the same as that of yarn spinning, and twisting of the fiber bundle 34 is performed by applying a swirling air flow formed by air injected from the spinning nozzle 131.

Next, the configuration of the fiber guide 101 will be described in detail with reference to FIGS. 4 to 7 and the like.

The fiber guide 101 is a hollow member formed into a substantially cylindrical shape. The axis AL of the fiber guide 101 is arranged so that its extension line coincides with the axis 108 of the spindle 102. In this embodiment, the fiber guide 101 is arranged at an angle so that the upstream end is higher than the downstream end. Taking this into consideration, in the following description, the upstream end surface of the fiber guide 101 may be referred to as the "top surface" and the downstream end surface may be referred to as the "bottom surface". In the fiber guide 101 of this embodiment, the distance (length) L1 from the top surface to the bottom surface is 1 mm or more and 5 mm or less.

In this embodiment, in the height direction of the spinning unit 7, the draft device 21 and the air spinning device 23 are arranged on the upper side, and the winding device 27 is arranged on the lower side. Instead of this configuration, the draft device 21 and the air spinning device 23 may be arranged on the lower side, and the winding device 27 may be arranged on the upper side. In this case, the fiber guide 101 is arranged to be inclined so that the upstream end is lower than the downstream end, and the top surface is located at a lower position than the bottom surface.

A twisted passage 111 is formed inside the fiber guide 101 . The upstream opening 111a located at the upstream end of the twisted passage 111 is formed on the top surface of the fiber guide 101, and the downstream opening 111b located at the downstream end is formed on the bottom surface of the fiber guide 101.

The upstream opening 111a of the twisting passage 111 is formed into an elongated substantially rectangular shape when viewed along the axis AL. The downstream opening 111b of the twisted passage 111 on the bottom surface of the fiber guide 101 is formed into a substantially C-shape when viewed along the axis AL. This downstream opening 111b is arranged so as to bypass the axis AL.

As shown in FIG. 5, the upstream opening 111a is arranged offset to one side with respect to the axis AL of the fiber guide 101. In FIG. 5 and the like, the direction in which the upstream opening 111a is offset with respect to the axis AL is indicated by an arrow OD1.

FIG. 5 shows the fiber guide 101 viewed from the upstream side along the axis AL. When viewed in this way, the upstream opening 111a and the downstream opening 111b only partially overlap. Therefore, the outline of the downstream opening 111b includes a portion that is visible through the upstream opening 111a and the twisting passage 111, and a portion that is not visible. In the following description, the part of the downstream opening 111b that can be seen through the torsion passage 111 when viewed from the upstream side along the axis AL is called the "first downstream opening", and the part that cannot be seen is called the "second downstream opening". It is sometimes called the "opening".

The first downstream opening is substantially shaped as an elongated, generally rectangular shape. The longitudinal direction of the rectangle of the first downstream opening matches the longitudinal direction of the rectangle of the upstream opening 111a. When viewed from the upstream side along the axis AL, the one side closest to the axis AL among the four sides of the first downstream opening and the one side closest to the axis AL among the four sides of the upstream opening 111a are: They practically overlap.

The second downstream opening is formed into an elongated shape that is bent into a substantially L-shape. A longitudinal end of the second downstream opening is connected to the first downstream opening.

Focusing on the shape of the twisting passage 111, when viewed from the upstream side along the axis AL, the twisting passage 111 has a first passage section 141 which is a part that can be visually recognized through the upstream opening 111a, and a second passage part which is an invisible part. It has a passage part 142.

As shown in FIGS. 4 and 5, the first passage section 141 is formed to penetrate through the fiber guide 101 so as to be substantially parallel to the axis AL of the fiber guide 101. The second passage portion 142 has a portion that extends in a direction generally opposite to the above-mentioned arrow OD1 as it approaches the downstream end surface 115b from the upstream end surface 115a of the fiber guide 101.

The upstream opening 111a of the twisting passage 111 corresponds to the opening on the upstream side of the first passage part 141. The first downstream opening among the downstream openings 111b of the twisting passage 111 corresponds to the downstream opening of the first passage section 141. The second downstream opening corresponds to the downstream opening of the second passage section 142.

As shown in FIG. 4, the first passage portion 141 includes a first inner wall surface 141a, a second inner wall surface 141b, a third inner wall surface 141c, and a fourth inner wall surface 141d. All four inner wall surfaces are formed into a planar shape. The four inner wall surfaces (in particular, the three inner wall surfaces excluding the second inner wall surface 141b that is farthest from the axis AL) function as guide surfaces that actually come into contact with the fiber bundle 34 and guide the fiber bundle 34.

The first inner wall surface 141a and the third inner wall surface 141c are located at both longitudinal ends of the upstream opening 111a, respectively. The second inner wall surface 141b and the fourth inner wall surface 141d are located at both ends in the lateral direction of the upstream opening 111a, respectively.

Hereinafter, the features of the first inner wall surface 141a and the third inner wall surface 141c will be explained in more detail with reference to FIGS. 5 and 6. FIG. 6 shows a cross section (first cross section) of the first passage section 141 of the fiber guide 101 cut along a plane SP1 indicated by a chain line in FIG. 5, as viewed in the direction of the bold line arrow in FIG. The plane SP1 is parallel to the axis AL of the fiber guide 101 and is defined to be parallel to the longitudinal direction of the upstream opening 111a.

As shown in FIG. 5, the outline of the upstream opening 111a and the plane SP1 have two intersections, and the outline of the downstream opening 111b and the plane SP1 have two intersections. The cross-sectional profile of the twisted passageway 111 taken along the plane SP1 has two lines corresponding to the first inner wall surface 141a and the third inner wall surface 141c, and the four intersection points are located at the ends of any of the lines. In the following description, the upstream intersection on the first inner wall surface 141a side may be referred to as a first upstream end point AU1, and the downstream intersection on the first inner wall surface 141a side may be referred to as a first downstream end point AD1. Further, the upstream intersection on the third inner wall surface 141c side may be referred to as a second upstream end point AU2, and the downstream intersection on the third inner wall surface 141c side may be referred to as a second downstream end point AD2.

The first upstream end point AU1 and the first downstream end point AD1 are located on one side of the twisting passage 111, and the second upstream end point AU2 and the second downstream end point AD2 are located on the other side of the twisting passage 111. The distance between the first upstream end point AU1 and the second upstream end point AU2 is longer than the distance between the first downstream end point AD1 and the second downstream end point AD2.

Hereinafter, a line (intersection line) where the first inner wall surface 141a and the plane SP1 intersect may be referred to as a first inner wall line WL1. As shown in FIG. 6, the first inner wall line WL1 corresponds to a portion of the first inner wall surface 141a in the outline of the first cross section of the twisted passageway 111. In this embodiment, the first inner wall line WL1 appears as a straight line connecting the first upstream end point AU1 and the first downstream end point AD1. Therefore, when the virtual straight line connecting the first upstream end point AU1 and the first downstream end point AD1 is defined as the first virtual straight line VL1, the first inner wall line WL1 and the first virtual straight line VL1 match.

As shown in FIG. 6, the first virtual straight line VL1 connecting the first upstream end point AU1 and the first downstream end point AD1 is 25° or more and 70° or less (preferably 30°) with respect to the axis AL of the fiber guide 101. 50 degrees or less). Hereinafter, the angle at which the first virtual straight line VL1 is inclined with respect to the axis AL may be referred to as a first inclination angle θ1. In this embodiment, the first inclination angle θ1 is approximately 35°.

Hereinafter, the line (intersection line) where the third inner wall surface 141c and the plane SP1 intersect may be referred to as a second inner wall line WL2. As shown in FIG. 6, the second inner wall line WL2 corresponds to a portion of the third inner wall surface 141c in the outline of the first cross section of the twisted passageway 111. In this embodiment, the second inner wall line WL2 appears as a straight line connecting the second upstream end point AU2 and the second downstream end point AD2. Therefore, when the virtual straight line connecting the second upstream end point AU2 and the second downstream end point AD2 is defined as the second virtual straight line VL2, the second inner wall line WL2 and the second virtual straight line VL2 match.

As shown in FIG. 6, the second virtual straight line VL2 connecting the second upstream end point AU2 and the second downstream end point AD2 is inclined at an inclination angle of 0° or more and less than 25° with respect to the axis AL of the fiber guide 101. ing. Hereinafter, the angle at which the second virtual straight line VL2 inclines with respect to the axis AL may be referred to as a second inclination angle θ2. θ2 may be 0°. That is, the second virtual straight line VL2 may be parallel to the axis AL. In this embodiment, the second inclination angle θ2 is approximately 16°.

In the first cross section, the first imaginary straight line VL1 and the second imaginary straight line VL2 (in other words, the first inner wall line WL1 and the second inner wall line WL2) are oriented in a direction that moves away from the outer periphery of the main body portion 115 as they approach the downstream end surface 115b. is inclined to.

In air spinning, it is desired to reduce fiber loss in which fibers come off from the fiber bundle 34 in the spinning chamber 113 in order to reduce material costs and the like. Shortening the distance L0 from the upstream end surface 102a of the spindle 102 to the nip point NP1 of the front roller pair 47, shown in FIG. 3, makes it difficult for the fibers to run freely, which is effective for reducing fiber loss. By determining θ1 and θ2 as described above, even if the length L1 of the fiber guide 101 is shortened, the fiber bundle 34 can be converged well as it passes through the twisting path 111.

In the fiber guide 101 of this embodiment, the axial length of the twisted passage 111 substantially matches the axial length L1 of the fiber guide 101. Hereinafter, a cross section of the twisted passage 111 cut by a plane SP3 perpendicular to the axial direction of the fiber guide 101 will be considered at a position where this length L1 is divided into two. Plane SP3 is shown in FIG.

This cross section has a bend 146 as shown in FIG. The bent portion 146 connects the fourth inner wall surface 141d and the intermediate inner wall surface 142a, which is the inner wall surface of the second passage section 142. In cross section, the bent portion 146 is formed as an arcuate protrusion. The intermediate inner wall surface 142a will be described later. The twisted passage 111 located near the cross section is divided into a first portion P1 having a small dimension D1 perpendicular to the first cross section and a second portion P2 having a large dimension D2 perpendicular to the first cross section, with the bent portion 146 as a boundary. , has. The position of the second portion P2 corresponds to the position of a recess 143, which will be described later.

The bent portion 146 is formed in a generally arc shape. One end of the bent portion 146 is smoothly connected to the fourth inner wall surface 141d. The bent portion 146 curves away from the second inner wall surface 141b as it moves away from the connection point with the fourth inner wall surface 141d. The other end of the bent portion 146 is smoothly connected to the intermediate inner wall surface 142a.

In this embodiment, the first inclination angle θ1, which is the inclination angle of the first virtual straight line VL1 close to the first portion P1, of the two virtual straight lines related to the first cross section is greater than or equal to 25° and less than or equal to 70°. Further, the second inclination angle θ2, which is the inclination angle of the second virtual straight line VL2 near the second portion P2, is greater than or equal to 0° and less than 25°.

As shown in FIG. 5, the second inner wall surface 141b is connected to each of the first inner wall surface 141a and the third inner wall surface 141c. When viewed from the upstream side along the axis AL, the second inner wall surface 141b is located on one side in the lateral direction of the upstream opening 111a. Specifically, when viewed from the upstream side along the axis AL, the second inner wall surface 141b is located on the side far from the axis AL in the lateral direction of the upstream opening 111a.

The fourth inner wall surface 141d is arranged on the opposite side of the second inner wall surface 141b. When viewed from the upstream side along the axis AL, the fourth inner wall surface 141d is located on the side closer to the axis AL in the lateral direction of the upstream opening 111a. The fourth inner wall surface 141d constitutes a planar inner wall surface located on the opposite side of the twisting passage 111 from the direction in which the upstream opening 111a is offset with respect to the axis AL (the direction indicated by the arrow OD1).

As shown in FIG. 4 and the like, an inclined depression 143 is formed at the end of the fourth inner wall surface 141d closer to the third inner wall surface 141c. The depression 143 opens to the first passage portion 141 inside the twist passage 111 . The recess 143 is also connected to the aforementioned second downstream opening that the downstream opening 111b has. The recess 143 is formed such that the distance from the first passage portion 141 increases as it approaches the downstream end surface 115b.

The second passage portion 142 corresponds to the internal space of the recess 143. The second passage part 142 is formed to extend in a direction away from the first passage part 141 (in a direction generally approaching the axis AL of the fiber guide 101) as it approaches the downstream side of the twisted passage 111.

As shown in FIG. 5, the second passage section 142 includes a first extension section 144 and a second extension section 145. The first extension part 144 is formed to extend in a direction away from the first passage part 141. When viewed from the upstream side along the axis AL, the first extension portion 144 extends in a direction opposite to the above-mentioned arrow OD1 so as to pass beside the axis AL. The second extension part 145 is connected to the first extension part 144 and extends in a short direction in a direction different from that of the first extension part 144 . The second extension 145 is arranged close to the axis AL. When viewed from the upstream side along the axis AL, the first extension part 144 and the second extension part 145 are connected substantially perpendicularly, and as a result, the second passage part 142 is formed in a substantially L-shape. .

The second extension part 145 is arranged on the opposite side of the first passage part 141 with the axis AL interposed therebetween. When viewed from the upstream side along the axis AL, the direction in which the second extension portion 145 extends is substantially parallel to the longitudinal direction of the upstream opening 111a.

The inner wall surface constituting the second passage portion 142 includes at least an intermediate inner wall surface 142a shown in FIG. The intermediate inner wall surface 142a constitutes a planar inner wall surface located on the opposite side of the twisting passage 111 from the direction in which the upstream opening 111a is offset with respect to the axis AL (the direction indicated by the arrow OD1).

Hereinafter, the second passage section 142 will be explained in more detail with reference to FIG. 7. FIG. 7 shows a cross section (second cross section) of the fiber guide 101 cut along the plane SP2 shown by the chain line in FIG. It shows. The plane SP2 is parallel to the axis AL of the fiber guide 101 and perpendicular to the longitudinal direction of the upstream opening 111a.

As shown in FIG. 7, the second passage section 142 is formed such that the distance L2 to the downstream opening 111b in the direction of the axis AL of the fiber guide 101 becomes shorter as the distance from the first passage section 141 increases. That is, the guide surface 142c, which is an inner wall surface constituting the second passage portion 142, is formed to be inclined with respect to the axis AL of the fiber guide 101.

The outline of the upstream opening 111a and the plane SP2 have two points of intersection, and the outline of the downstream opening 111b and the plane SP2 have two points of intersection. The cross-sectional profile of the twisted passage 111 taken along the plane SP2 has two lines corresponding to the second inner wall surface 141b and the guide surface 142c, and the four intersections are located at the ends of any of the lines. In the following description, the upstream intersection on the second inner wall surface 141b side may be referred to as a third upstream end point BU3, and the downstream intersection on the second inner wall surface 141b side may be referred to as a third downstream end point BD3. Further, the upstream intersection on the guide surface 142c side may be referred to as a fourth upstream end point BU4, and the downstream intersection on the guide surface 142c side may be referred to as a fourth downstream end point BD4.

The third upstream end point BU3 and the third downstream end point BD3 are located on one side of the twisting passage 111, and the fourth upstream end point BU4 and the fourth downstream end point BD4 are located on the other side of the twisting passage 111. The distance between the third upstream end point BU3 and the fourth upstream end point BU4 is shorter than the distance between the third downstream end point BD3 and the fourth downstream end point BD4.

Hereinafter, a line (intersection line) where the second inner wall surface 141b and the plane SP2 intersect may be referred to as a third inner wall line WL3. The third inner wall line WL3 corresponds to a portion of the second inner wall surface 141b of the outline of the second cross section obtained by cutting the twisting passage 111. In this embodiment, the third inner wall line WL3 appears in a straight line connecting the third upstream end point BU3 and the third downstream end point BD3. Therefore, when the virtual straight line connecting the third upstream end point BU3 and the third downstream end point BD3 is defined as the third virtual straight line VL3, the third inner wall line WL3 and the third virtual straight line VL3 match.

As shown in FIG. 7, the third virtual straight line VL3 connecting the third upstream end point BU3 and the third downstream end point BD3 is inclined with respect to the axis AL of the fiber guide 101 at an inclination angle of, for example, 0° or more and 10° or less. are doing. Hereinafter, the angle at which the third virtual straight line VL3 is inclined with respect to the axis AL may be referred to as a third inclination angle θ3. θ3 may be 0°. That is, the third virtual straight line VL3 may be parallel to the axis AL.

Hereinafter, the line where the guide surface 142c and the plane SP2 intersect (intersection line) may be referred to as a fourth inner wall line WL4. The fourth inner wall line WL4 corresponds to a portion of the guide surface 142c in the outline of the second cross section of the twisting passage 111. In this embodiment, the fourth inner wall line WL4 appears to have a curved portion. Therefore, when the virtual straight line connecting the fourth upstream end point BU4 and the fourth downstream end point BD4 is defined as the fourth virtual straight line VL4, the fourth inner wall line WL4 and the fourth virtual straight line VL4 do not match.

As shown in FIG. 7, the fourth virtual straight line VL4 connecting the fourth upstream end point BU4 and the fourth downstream end point BD4 is 35° or more and 85° or less, preferably 40° or more, with respect to the axis AL of the fiber guide 101. It is inclined at an angle of inclination of 70° or less. Hereinafter, the angle at which the fourth virtual straight line VL4 inclines with respect to the axis AL may be referred to as a fourth inclination angle θ4. In this embodiment, the fourth inclination angle θ4 is approximately 45°.

In the second cross section, the third virtual straight line VL3 and the fourth virtual straight line VL4 (in other words, the third inner wall line WL3 and the fourth inner wall line WL4) move toward the opposite side of the above-mentioned arrow OD1 as they approach the downstream end surface 115b. It is tilted in the direction.

By setting the fourth inclination angle θ4 to 35° or more and 85° or less, it is possible to realize a configuration in which the inner wall surface of the twisting passage 111 is unlikely to obstruct the reversal of the fibers in the spinning chamber 113. As a result, the physical properties of the spun yarn 30 produced by the air spinning device 23 can be improved. Moreover, since the volume of the twisted passage 111 can be increased, the effect of sucking air from the upstream opening 111a can be improved. Therefore, smooth air spinning can be achieved.

In the main body portion 115 of the fiber guide 101, as shown in FIG. There is. The second chamfered portion 116 is disposed on the opposite side of the first chamfered portion 114 with the axis AL interposed therebetween. The first chamfered portion 114 and the second chamfered portion 116 are formed in an inclined planar shape.

When viewed from the upstream side along the axis AL, as shown in FIG. Located in

The first chamfered portion 114 is inclined with respect to the axis AL of the fiber guide 101 at an inclination angle of 50° or more and 70° or less, as shown by angle θA in FIG. 7 . The second chamfered portion 116 is inclined at an inclination angle of 20° or more and 30° or less with respect to the axis AL of the fiber guide 101, as shown by angle θB in FIG. In this embodiment, the angle θA is approximately 55°, and the angle θB is approximately 25°.

The first chamfer 114 and the second chamfer 116 allow the fiber guide 101 to be placed close to the front roller pair 47 of the draft device 21 . Further, in this embodiment, the first chamfer 114 and the second chamfer 116 are asymmetrically inclined. Therefore, as shown in FIG. 3, it is easy to arrange the upstream opening 111a offset with respect to the axis AL so as to correspond to the fiber bundle passage between the pair of front rollers 47.

As explained above, the twisted passage 111 is formed inside the fiber guide 101 of this embodiment. In the fiber guide 101, a first cross section of the twisted passage 111 taken along a plane SP1 parallel to the axial direction includes a first inner wall line WL1 and a second inner wall line WL2, as shown in FIG. The first inner wall line WL1 corresponds to the first inner wall surface 141a on one side of the twisting passage 111. The second inner wall line WL2 corresponds to the third inner wall surface 141c on the opposite side to the first inner wall surface 141a. Between a first upstream end point AU1 corresponding to the upstream end of the twisting passage 111 on the first inner wall line WL1 and a second upstream end point AU2 corresponding to the upstream end of the twisting passage 111 on the second inner wall line WL2 The distance is between a first downstream end point AD1 corresponding to the downstream end of the twisted passage 111 on the first inner wall line WL1 and a second downstream end point AD2 corresponding to the downstream end of the twisted passage 111 on the second inner wall line WL2. longer than the distance between and. The first virtual straight line VL1 connecting the first upstream end point AU1 and the first downstream end point AD1 is inclined with respect to the axial direction of the fiber guide 101 at an inclination angle of 25° or more and 70° or less (25°≦θ1≦ 70°).

Thereby, it is possible to configure a twisting passage 111 that can guide the fiber bundle 34 to the downstream side while suitably converging it.

In the fiber guide 101 of this embodiment, the first virtual straight line VL1 is inclined with respect to the axial direction of the fiber guide 101 at an inclination angle of 30° or more and 50° or less (30°≦θ1≦50°).

Thereby, it is possible to configure the twisted passage 111 that can guide the fiber bundle 34 to the downstream side while converging it more suitably.

In the fiber guide 101 of this embodiment, the first inner wall line WL1 is formed in a straight line connecting the first upstream end point AU1 and the first downstream end point AD1. The second inner wall line WL2 is formed in a straight line connecting the second upstream end point AU2 and the second downstream end point AD2.

Thereby, the fiber bundle 34 can be smoothly guided downstream.

In the fiber guide 101 of this embodiment, the size of the angle that the first virtual straight line VL1 makes with the axial direction of the fiber guide 101, and the size of the angle that the second virtual straight line VL2 makes with the axial direction of the fiber guide 101. , are different (θ1≠θ2).

Thereby, the degree of freedom in the shape of the path through which the fiber bundle 34 passes can be improved.

In the fiber guide 101 of this embodiment, the first virtual straight line VL1 is inclined with respect to the axial direction of the fiber guide 101 at an inclination angle of 25° or more and 70° or less (25°≦θ1≦70°). The second virtual straight line VL2 is inclined with respect to the axial direction of the fiber guide 101 at an inclination angle of less than 25° (θ2<25°).

Thereby, the fiber bundle 34 can be guided downstream while converging suitably.

In the fiber guide 101 of this embodiment, a cross section of the twisted passage 111 cut by a plane SP3 perpendicular to the axial direction of the fiber guide 101 at a position dividing the axial length L1 of the twisted passage 111 into two is as shown in the figure. 8, it has a bent portion 146. The twisted passage 111 located near the cross section is divided into a first portion P1 having a smaller dimension D1 perpendicular to the first cross section and a second portion P2 having a larger dimension D2 perpendicular to the first cross section, with the bent portion 146 as a boundary. , has. The first virtual straight line VL1 inclined at an inclination angle of 25° or more and 70° or less is closer to the first portion P1 than the second virtual straight line VL2 inclined at an inclination angle of less than 25°.

Thereby, the fiber bundle 34 can be transferred from the first portion P1 to the second portion P2 via the bending portion 146, and the fiber bundle 34 can be guided downstream while converging suitably.

A twisted passage 111 is formed inside the fiber guide 101 of this embodiment. In the fiber guide 101, the second cross section of the twisted passage 111 taken along the plane SP2 parallel to the axial direction includes a third inner wall line WL3 and a fourth inner wall line WL4, as shown in FIG. The third inner wall line WL3 corresponds to the second inner wall surface 141b on one side of the twisting passage 111. The fourth inner wall line WL4 corresponds to the guide surface 142c located on the opposite side to the second inner wall surface 141b. Between a third upstream end point BU3 corresponding to the upstream end of the twisting passage 111 on the third inner wall line WL3 and a fourth upstream end point BU4 corresponding to the upstream end of the twisting passage 111 on the fourth inner wall line WL4 The distance is between a third downstream end point BD3 corresponding to the downstream end of the twisted passage 111 at the third inner wall line WL3 and a fourth downstream end point BD4 corresponding to the downstream end of the twisted passage 111 at the fourth inner wall line WL4. shorter than the distance between and. The fourth virtual straight line VL4 connecting the fourth upstream end point BU4 and the fourth downstream end point BD4 is inclined with respect to the axial direction of the fiber guide 101 at an inclination angle of 35° or more and 85° or less (35°≦θ4≦ 85°).

Thereby, it is possible to realize a configuration in which the inner wall surface of the twisting passage 111 is unlikely to inhibit the fibers from being reversed by air spinning performed downstream of the twisting passage 111.

In the fiber guide 101 of this embodiment, the fourth virtual straight line VL4 is inclined with respect to the axial direction of the fiber guide 101 at an inclination angle of 40° or more and 70° or less (40°≦θ4≦70°).

Thereby, it is possible to realize a configuration in which the inner wall surface of the twisting passage 111 is unlikely to inhibit the fibers from being reversed by air spinning performed downstream of the twisting passage 111.

In the fiber guide 101 of this embodiment, the upstream opening 111a located at the upstream end of the twisted passage 111 is offset to one side with respect to the axis AL of the fiber guide 101. Among the inner wall surfaces of the twisting passage 111, the inner wall surface located on the opposite side to the direction in which the upstream opening 111a is offset with respect to the axis AL (the direction indicated by the arrow OD1) has two planes, that is, the fourth inner wall surface 141d. and an intermediate inner wall surface 142a.

Thereby, the fiber bundle 34 can be appropriately guided downstream by the inner wall surface.

The fiber guide 101 of this embodiment has an upstream end surface 115a and a downstream end surface 115b. An upstream opening 111a located at the upstream end of the twisting passage 111 is formed in the upstream end surface 115a. A downstream opening 111b located at the downstream end of the twisting passage 111 is formed in the downstream end surface 115b. The length L1 between the upstream end surface 115a and the downstream end surface 115b is 1 mm or more and 5 mm or less (1 mm≦L1≦5 mm).

Thereby, the fiber guide 101 can be downsized.

The fiber guide 101 of this embodiment includes a first chamfered portion 114. The first chamfered portion 114 is formed between the upstream end surface 115a and the side surface. The angle of inclination of the first chamfered portion 114 with respect to the axial direction of the fiber guide 101 is greater than or equal to 50° and less than or equal to 70° (50°≦θA≦70°).

Thereby, the fiber guide 101 can be placed close to the front roller pair 47 of the draft device 21.

The air spinning device 23 of this embodiment includes a fiber guide 101 and a spindle 102. The spindle 102 guides the spun yarn 30 twisted by the air ejected from the spinning nozzle 131 to the downstream side.

Thereby, the fiber bundle 34 is suitably converged in the twisting passage 111 while being guided to the downstream side, and spinning is performed using the air flow, so that a spun yarn 30 with good physical properties can be produced. Furthermore, fiber loss caused by fibers falling off without being spun during the air spinning process can be reduced.

The air spinning machine 1 of this embodiment includes an air spinning device 23, a yarn storage roller 53, and a winding device 27. The yarn storage roller 53 draws out the yarn spun by the air spinning device 23. The winding device 27 winds up the yarn pulled out by the yarn storage roller 53.

Thereby, it is possible to wind up the spun yarn 30 with good physical properties, and it is possible to realize the air spinning machine 1 with less fiber loss.

Although the preferred embodiments of the present invention have been described above, the above configuration can be modified as follows, for example. A single change may be made, or a plurality of changes may be made in any combination.

The shape of the first inner wall line WL1 is arbitrary, and for example, it can be formed into at least one of a straight line, a polygonal line, and a curved line. The same applies to the shapes of the second inner wall line WL2, the third inner wall line WL3, and the fourth inner wall line WL4.

In the configuration of FIG. 6 or 9, the twisted passage 111 can also be formed so that θ1=θ2. Both θ1 and θ2 may be 25° or more and 70° or less, or both θ1 and θ2 may be 30° or more and 50° or less.

In the configuration of FIG. 6 or 9, the twisted passage 111 may be configured so that θ1<25° and 25°≦θ2≦70°.

Both θ3 and θ4 may be 35° or more and 85° or less, or both θ3 and θ4 may be 40° or more and 70° or less.

The needle-like member 104 can be omitted. In this case, the through hole 112 is not formed in the fiber guide 101.

The shape of the twisting passage 111, including the shapes of the upstream opening 111a, the downstream opening 111b, the bent portion 146, and the depression 143, can be changed as appropriate.

Between the upstream opening 111a and the downstream opening 111b of the twisting passage 111, the length of the portion that actually contacts the fiber bundle 34 and guides the fiber bundle 34 in the direction of the axis AL is 1 mm or more and 5 mm or less. For example, the length of the fiber guide 101 in the direction of the axis AL may be longer than 5 mm.

As shown in FIG. 9, the downstream side of the first passage portion 141 (or the entire twisted passage 111) has a vertical portion 111c that extends straight when viewed in a direction perpendicular to the axis AL of the fiber guide 101. Also good. In this case, the length L3 of this vertical portion 111c is preferably less than 50% of the total length L4 of the twisting passage 111 in the direction of the axis AL.

As shown in the example of FIG. 10, the second extension part 145 may be omitted in the second passage part 142.

As shown in the example of FIG. 11, the second passage portion 142 (in other words, the depression 143) may be omitted in the twist passage 111. In this case, among the inner wall surfaces of the twisting passage 111, only one plane, the fourth inner wall surface 141d, is located on the opposite side to the direction indicated by the arrow OD1.

The shape of the fiber guide 101 is arbitrary, and can be formed into a block shape, for example. The inclination angles of the first chamfered portion 114 and the second chamfered portion 116 can be changed as appropriate. At least one of the first chamfer 114 and the second chamfer 116 may be omitted.

Fiber guide 101 and nozzle block 103 can be configured as one component. In this case, a spinning nozzle 131 and a spinning chamber 113 are integrally formed in the fiber guide 101. With this configuration, the number of parts can be reduced.

The spinning unit 7 may be provided with a device including a delivery roller and a driven roller instead of or in addition to the yarn storage roller 53. By rotationally driving the delivery roller with the spun yarn 30 sandwiched between the delivery roller and the driven roller, the spun yarn 30 can be drawn out from the air spinning device 23 to the downstream side.

The air spinning device 23 may be configured to perform two types of spinning, normal spinning and piecing, instead of performing two types of spinning, normal spinning and yarn release spinning. Piecing is a yarn splicing method that does not use a splicer device or a knotter as in the above embodiment, and the spun yarn 30 from the package 73 is run backwards to the air spinning device 23 or the front roller pair 47, and in this state, the spun yarn 30 is passed through the draft device. In this method, yarn piecing is performed by restarting the drafting operation by the air spinning device 21 and the spinning operation by the air spinning device 23. In this case, air may be injected from an auxiliary nozzle in order to introduce the spun yarn 30 from the package 73 into the air spinning device 23 .

In the air spinning machine 1, instead of including the yarn splicing cart 9, at least a part of the device related to yarn splicing may be provided in each spinning unit 7.

1 Air spinning machine 23 Air spinning device 27 Winding device 30 Spun yarn (thread)
53 Yarn storage roller (pull-out device)
101 Fiber guide 102 Spindle (hollow guide shaft)
111 Twisted passage (fiber passage)
111a Upstream opening 111b Downstream opening 113 Spinning chamber (swirling chamber)
115a Upstream end surface 115b Downstream end surface 131 Spinning nozzle 142c Guide surface (inner wall surface)
146 Bend portion AU1 First upstream end point AD1 First downstream end point AU2 Second upstream end point AD2 Second downstream end point BU3 Third upstream end point BD3 Third downstream end point BU4 Fourth upstream end point BD4 Fourth downstream end point D1, D2 Dimensions WL1 1st Inner wall line WL2 Second inner wall line WL3 Third inner wall line WL4 Fourth inner wall line P1 First part P2 Second part VL1 First imaginary straight line VL2 Second imaginary straight line VL4 Fourth imaginary straight line

Claims (14)

A fiber guide having a fiber passage formed therein,
A first cross section of the fiber passage taken along a plane parallel to the axial direction of the fiber guide includes a first inner wall line corresponding to an inner wall surface on one side of the fiber passage, and an inner wall surface on the opposite side to the inner wall surface. a second inner wall line corresponding to;
A distance between a first upstream end point corresponding to the upstream end of the fiber passage on the first inner wall line and a second upstream end point corresponding to the upstream end of the fiber passage on the second inner wall line. is between a first downstream end point corresponding to the downstream end of the fiber passage on the first inner wall line and a second downstream end point corresponding to the downstream end of the fiber passage on the second inner wall line. longer than the distance of
At least one of a first virtual straight line connecting the first upstream end point and the first downstream end point and a second virtual straight line connecting the second upstream end point and the second downstream end point is the axis of the fiber guide. A fiber guide characterized by being inclined at an inclination angle of 25° or more and 70° or less with respect to the direction. The fiber guide according to claim 1,
A fiber guide, wherein at least one of the first virtual straight line and the second virtual straight line is inclined at an inclination angle of 30° or more and 50° or less with respect to the axial direction of the fiber guide. The fiber guide according to claim 1,
The first inner wall line is formed in a straight line connecting the first upstream end point and the first downstream end point,
The fiber guide is characterized in that the second inner wall line is formed in a straight line connecting the second upstream end point and the second downstream end point. The fiber guide according to claim 1,
A fiber characterized in that the angle that the first virtual straight line makes with the axial direction of the fiber guide is different from the angle that the second virtual straight line makes with the axial direction of the fiber guide. guide. The fiber guide according to claim 1,
The first virtual straight line is inclined with respect to the axial direction of the fiber guide at an inclination angle of 25° or more and 70° or less,
A fiber guide, wherein the second virtual straight line is parallel to the axial direction of the fiber guide or is inclined at an inclination angle of less than 25°. The fiber guide according to claim 5,
A cross section of the fiber passage cut by a plane perpendicular to the axial direction of the fiber guide at a position dividing the axial length of the fiber passage into two halves has a bent portion,
The fiber passage located near the cross section has a first portion having a small dimension perpendicular to the first cross section and a second portion having a large dimension perpendicular to the first cross section, with the bent portion as a boundary. has
A fiber guide, wherein the first virtual straight line is closer to the first portion than the second virtual straight line. A fiber guide having a fiber passage formed therein,
A second cross section of the fiber passage taken along a plane parallel to the axial direction of the fiber guide includes a third inner wall line corresponding to an inner wall surface on one side of the fiber passage, and an inner wall surface on the opposite side to the inner wall surface. a fourth inner wall line corresponding to;
A distance between a third upstream end point corresponding to the upstream end of the fiber passage on the third inner wall line and a fourth upstream end point corresponding to the upstream end of the fiber passage on the fourth inner wall line. is between a third downstream end point corresponding to the downstream end of the fiber passage on the third inner wall line and a fourth downstream end point corresponding to the downstream end of the fiber passage on the fourth inner wall line. shorter than the distance of
At least one of a third imaginary straight line connecting the third upstream end point and the third downstream end point and a fourth imaginary straight line connecting the fourth upstream end point and the fourth downstream end point of the fiber guide A fiber guide characterized by being inclined at an inclination angle of 35° or more and 85° or less with respect to the axial direction. The fiber guide according to claim 7,
A fiber guide, wherein at least one of the third virtual straight line and the fourth virtual straight line is inclined with respect to the axial direction of the fiber guide at an inclination angle of 40° or more and 70° or less. The fiber guide according to claim 7,
The upstream opening located at the upstream end of the fiber passage is offset to one side with respect to the axis of the fiber guide,
A fiber guide, wherein, among the inner wall surfaces of the fiber passage, an inner wall surface located on the opposite side of the direction in which the upstream opening is offset with respect to the axis of the fiber guide includes one or more planes. A fiber guide according to any one of claims 1 to 9,
an upstream end surface in which an upstream opening located at an upstream end of the fiber passage is formed;
a downstream end surface in which a downstream opening located at a downstream end of the fiber passage is formed;
has
A fiber guide characterized in that the length between the upstream end face and the downstream end face is 1 mm or more and 5 mm or less. A fiber guide according to any one of claims 1 to 10,
A spinning nozzle that blows out the air that passes through it;
a swirling chamber in which a swirling airflow formed by air ejected from the spinning nozzle acts on the fibers;
A fiber guide characterized by being integrally formed. A fiber guide according to any one of claims 1 to 11,
a chamfered portion formed between an upstream end face where an upstream opening is formed located at an upstream end of the fiber passage and a side surface;
A fiber guide characterized in that the angle of inclination of the chamfered portion with respect to the axial direction of the fiber guide is 50° or more and 70° or less. A fiber guide according to any one of claims 1 to 12,
a hollow guide shaft that guides the fibers twisted by the air ejected from the spinning nozzle to the downstream side;
An air spinning device characterized by comprising: The air spinning device according to claim 13;
a pulling device for pulling out the yarn spun by the air spinning device;
a winding device that winds the thread pulled out by the pulling device;
An air spinning machine characterized by comprising:

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