JPH01156518A - Production apparatus for spun yarn - Google Patents

Abstract

PURPOSE:To ensure the insertion of a fiber bundle into a rotary pipe, by providing an outlet of a rotary pipe with an ejection nozzle to eject air in a specific direction and a pin for inhibiting the propagation of twist and protruded along the path of the fiber bundle. CONSTITUTION:An air ejection nozzle 37 and a needle pin 38 protruding along a path 124 of fiber bundle are placed in a through-hole 36 connected to an outlet 119c of a rotary pipe 119. The air ejection nozzle 37 is directed in the tangential direction against the path 124 of the fiber bundle and is opened toward the direction separating from the rotary pipe 119. The twisting of the fiber bundle S in the rotary pipe 119 and the winding of the bundle S around the inlet part 119a can be prevented in the present apparatus.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for producing spun yarn, and more specifically, for producing spun yarn by heating untwisted short fiber bundles drafted by a drafting device. Regarding the device.

[Conventional technology]

Conventional spinning machines are broadly classified into three types: ring type, oven-end type, and pneumatic type.

Among these, pneumatic spinning machines have been developed in recent years and are capable of spinning at speeds several times faster than ring-type spinning machines.
No. 8). In the device disclosed in this publication, two air injection nozzles are disposed following the drafting device, and each nozzle applies compressed air streams swirling in opposite directions to the fiber bundle coming out of the drafting device. The fiber bundle is false twisted by the second nozzle, and the false twisted fiber bundle is ballooned by the first nozzle. This balloon wraps some fibers onto other fibers, and the fiber bundle passes through a second nozzle and is untwisted to be tightly wrapped, thus forming a single spun yarn. generated.

[Problem that the invention seeks to solve]

A detailed examination of the table obtained by the conventional air spinning machine mentioned above reveals that other wi
It can be seen that the fibers are bound spun yarns that are spirally wound.

The quantitative ratio of the core fiber and the wrapped fiber, the manner in which the fibers are wrapped, etc. can be changed to some extent by variously changing the spinning conditions, and the physical properties of the yarn such as yarn strength can also be changed accordingly. Although it is possible to change the fiber length, it is difficult to stabilize the behavior of the wrapped fibers in this pneumatic spinning machine when the fiber length becomes long. Additionally, since this spinning machine uses two nozzles, it consumes a lot of compressed air, resulting in high energy costs.Additionally, there is a problem in that it has considerable difficulty in spinning long fibers such as wool. there were. The present inventor has focused on the above-mentioned circumstances and has succeeded in developing a new spinning device to replace the conventional pneumatic spinning machine described above.

That is, it has a rotating pipe having a fiber bundle passage through which the fiber bundle coming out from the front roller of the draft device passes, and a casing that covers the rotating pipe, and the rotation is caused by the swirling flow from the swirling air injection nozzle opened in the casing. Near the entrance of the pipe, the fibers separated from the fiber bundle are
This is a device that winds the yarn in the east direction to form a spun yarn.

However, the above-mentioned apparatus requires a step of passing the fiber bundle through a rotating pipe before starting spinning. The diameter of the above-mentioned rotating pipe is made as small as possible in order to wrap the rotating pipe around its outer circumference with one end separated, so it is extremely difficult to smoothly introduce the fiber bundle into such a small-diameter pipe. There was a problem.

Therefore, the present invention is the above-mentioned novel spun yarn manufacturing apparatus,
Moreover, it is an object of the present invention to provide a manufacturing apparatus that can reliably insert the fiber bundle into the rotating pipe.

[Means for solving problems]

That is, the spun yarn manufacturing apparatus according to the present invention includes a rotating pipe having a fiber bundle passage through which the fiber bundle coming out from the front roller of the drafting device passes, and a casing that covers the rotating pipe. This device forms a spun yarn by winding the fibers separated from the fiber bundle around the fiber bundle near the entrance of the rotating pipe using a swirling flow from an air injection nozzle. A jet nozzle is provided that sprays air in a direction away from the pipe and substantially tangential to the fiber bundle path, and a pin is provided that projects along the fiber bundle path to prevent twist propagation. be.

〔Example〕

FIG. 6 shows a front view of a spinning machine equipped with a spun yarn manufacturing apparatus according to the present invention, and the present spinning machine is shown in a side view (a seventh ), a large number of spinning units (U) are arranged in parallel on a U-shaped frame ('F). In the longitudinal direction of the machine base of this spinning machine, there is a trolley running space (3) along the rows of units (U) shown above.
A running trolley (5) equipped with a doffing device (4) and a yarn splicing truck (7) equipped with a yarn splicing device (6) are integrated. 8) runs.

Reference numeral (9) denotes a paper tube supply device that is located between the prime mover box (1) and the spinning unit (U) and supplies paper tubes to the doffing device (4).

FIG. 7 is a schematic side view, and the spinning unit (U) has a three-wire draft device (14) consisting of a back roller (11), a middle roller (12), and a front roller (13).
(a 4-wire system or more may be used to obtain a high draft rate), a spun yarn manufacturing apparatus (15) according to the present invention which will be described in detail later, and a spun yarn (Y) produced by the manufacturing apparatus (15). ), the delivery roller (16) that pulls out the spun yarn (Y)
It consists of a slab catcher (17) that detects the thick yarn portion of the yarn (Y) and a winding section (18) that winds the yarn (Y) while traversing it around the package (P).

(19) (20) are clamping rollers (21) (21) (22) (22) provided above and below the cart (8).
a rail that guides the cart (8) by being sandwiched between the rails;
(30) is a friction roller that rolls into contact with the package (P).

The yarn splicing cart (7) includes a suction pipe (23) that sucks and grips the upper yarn (YN) on the spinning side and guides it to the yarn splicing device (6).
A suction mouse (24) suction-grips the bobbin thread (yp) on the package (P) side and guides it to the thread sewing device (6).
As shown by the one-dot chain line in FIG. 7, each suction member (23) (24) is provided so as to be able to turn, and the base ends of these suction members (23) and (24) are constantly biased to protrude toward the rear of the truck (7) by springs (not shown). A connecting duct (25) is connected to the suction duct (26) extending along the unit (U) inside the space (3).
The knee is brought into contact with the suction pipe (23) and the suction mouth (24) to perform suction.

(27) is the suction duct) The hole (2
8), and the blocking plate (27) is the fulcrum (27).
9), and can freely turn left and right by about 90 degrees, and when the above-mentioned trolley (8) approaches, the above-mentioned connecting duct l-(
25) engages with the U-shaped notch (31), and the closing plate (2
7) is brought into a substantially vertical position, and the hole (2B) and the connecting duct (25) are directly connected, so that a suction action is applied to the suction pipe (23) and the suction mouth (24) at this position. There is.

(32) is a slack tube consisting of an elongated cylindrical tube whose tip opens into the thread passage between the delivery roller (16) and the slab catcher (17), and the proximal end of the slack tube (32) is connected to the suction (26).

The untwisted wool worsted roving or fiber bundle (S) wound as a yarn feeding package (33) is passed through the draft device (14).
The spun yarn is then introduced into the spun yarn manufacturing apparatus (15) of the present invention to become a spun yarn (Y), and after being pulled out by a delivery roller (16), it is wound onto a package (P).

The detailed structure of the above-mentioned spun yarn manufacturing apparatus (15) is shown in FIG. 1, in which the dashed dotted line extending left and right indicates the running path of the fiber bundle (S) or the spun yarn (Y).

(111) is a support plate fixed to the frame (F), and a hollow cylindrical bearing (113) is fixed to the plate (111) by screws, etc., and a rotating pipe and rotating shaft (described later) are further fixed by screws, etc. Disc casing (11
5) is fixed. The casing (115) is composed of a pair of front and rear split types (115a) (115b),
It is screwed on.

Bearing (117) inside the above bearing (113)
(11B) A rotary pipe (119) is rotatably supported via the rotary pipe (119). There is a hollow Boo! on the outer periphery of the pipe (119). I (121) is inserted. .

(123) is the boo! J (121>) is an endless drive belt that is suspended along the unit (U) so as to be in contact with the outer periphery of the unit (U) and is driven to run by a motor (not shown).
(123) Boo! I (12
1) Along with this, the rotating pipe (119) rotates at high speed. A rotating plate (126) is integrally formed in front of the bearing (118) of the rotating pipe (119).

At the center of the rotating pipe (119) is a fiber bundle passage (124).
) is formed through this passage (
124) and the center of each hollow part of the casing (115) are both located on the same straight line that coincides with the running path of the fiber bundle (S), and the pipe entrance (119a) and the front roller nip point (N) are located on the same straight line. The distance of the fiber bundle (
S) is arranged so that it is shorter than the average length of the fibers constituting it. Inlet part (119a) of rotating pipe (119)
has a sufficiently small outer diameter, and the outer diameter of the portion following the inlet (119a) is the same diameter in a certain section, and after the same diameter portion, it has a conical shape (119a) that increases toward the rotary plate (126).
119b), and the casing (115b
) rotating pipe (119') and rotating plate (126)
The part that covers the inlet part (119) of the rotating pipe (119)
9a) The vicinity is a small, inner cylindrical hollow chamber (151), this hollow chamber (151) L, and the contiguous part is a conical hollow chamber (152) that opens with a large false degree. .

Further, the portion in front of the small-diameter hollow chamber (151) is formed into a cylindrical shape with a diameter slightly larger than the tip diameter of the rotary pipe (119), and the cylindrical portion is formed into a guide passage (11) for the fiber bundle (S).
2) None. The above conical hollow chamber (152)
There is an annular hollow chamber (153) on the outer periphery of the
3) is formed with a tangential air escape hole (154) that is continuous with the air vent hole (154).

An air suction pipe (15) is provided in the air escape hole (154).
5) are connected.

A hollow air chamber (131) is formed inside the casing (115b), and the air chamber (131)
toward the inlet (119a) of the rotating pipe,
Also, four air injection nozzles (127) are formed which are oriented tangentially to the hollow chamber (151).
3), a second hose (129) is connected to the air chamber (131) via a hole (128). The above nozzle (1
The direction of 27) is set to be the same as the rotation direction of the rotary pipe (119).

After the compressed air supplied from the hose (129) flows into the air chamber (131), it is ejected from the nozzle (127) into the hollow chamber (151), and the rotary vibe inlet (
A high-speed swirling airflow is generated near 119a).

After this airflow swirls inside the hollow chamber (151), it diffuses outward while gently swirling inside the aforementioned conical hollow chamber (152), is guided toward the escape hole (154), and is discharged. . At the same time, the air flow is also controlled by the front roller (13
) generates a suction air flow flowing into the hollow part of the casing (115) from the nip point (N) of the casing (115).

Furthermore, (34) is a cap fitted to the rear end of the bearing (113), and the cap (34) is integrally formed with a protruding tube portion (35) that protrudes rearward. The rotating pipe (119) passes through the portion (35).
A through hole (36) communicating with the outlet (119C) is opened, and four air injection nozzles (37) and a fiber bundle passageway (124) are provided with the opening facing into the through hole (36).
A needle pin (38) protruding along the is provided.

As shown in Figure 1.5, the four air injection nozzles (37) each face tangentially to the fiber bundle passage (124) and open in a direction away from the rotating pipe (119). It is.

(135) is the compressed air supply hose to the air injection nozzle (37), (136) is the hose (135)
(137) is a hole through which the compressed air supplied from
) is an annular air chamber that communicates with the air chamber.

In addition, in the above example, is it an air injection nozzle? The injection direction of the air injection nozzle (127) is set to produce a swirling airflow in the same direction as the air injection nozzle (127), but it may be in the opposite direction.

The needle bottle (38) also has a cap (
It is buried and fixed inside the air jet nozzle (124), and its tip # is bent so as to extend along the center of the wa Ito passage (124), and its tip position is the same as the air injection nozzle (124) in Fig. 1. 37) near the virtual intersection point which is an extension of the slope.

(138) is an O-ring fitted in the # part of the rotary pipe (119), and when the O-ring (138) comes into close contact with the inner surface of the cap (34), it connects the through hole (36) with the rotary pipe (119). > This prevents air leakage between the

On the other hand, in the cylindrical part at the front end of the casing forming the guide passage (112), there is a pipe (119) which smoothly rotates the substantially flat fibers sent out from the front roller (I3).
In order to introduce it to the entrance, weir members (39) such as:
(40) is the provision.

That is, a counterbore is formed in the inner surface of the cylindrical portion (112), and an auxiliary cylinder (41 mm) is inserted into the approximately central position of the cylindrical portion (112). A plate-shaped weir member (3
9) (40) is provided.

The height (h) of each weir member (39) (40) is cylindrical (
The inner diameter of the casing (41) is set to a value smaller than 172 mm, and the upper sides (39a) and (40a) of each are formed horizontally (that is, parallel to the nip plane of the front roller (13)). 115) When viewed from the front, the fourth
As shown in the figure, the structure is such that the inlet of the rotating pipe (119) is slightly visible through the horizontally long gap between the two weir members (39) and (40).

Next, the yarn manufacturing process using the above textile machine will be explained.

The fiber bundle (S) drafted by the drafting device (14) and sent out from the front roller (13) is directed into the passage in front of the cylindrical part (guide passage) (112) by the suction air flow (this suction The flow is caused by an air jet from a nozzle (127)) into the guide passage (1).
12) This front roller (
Prior to sending out the fiber bundle (S) from the air injection nozzle (37), air is injected from the air injection nozzle (37) to fill the through hole (S).
36), a swirling airflow (
B) is generated.

This swirling air flow makes the first flow stronger than the normal straight flow.
The suction airflow heading to the left in the figure is the rotating pipe (119)
The fiber bundle (S) is produced in the rotating pipe (119), and the fiber bundle (S) is transferred to the inlet (119a) of the rotating pipe (119).
An air current is created that draws the air into the cylinder II (112
) The fiber bundle (S) entering the inside is smoothly drawn into the rotating pipe (119).

Then, the swirling airflow from the air injection nozzle (37) directly acts on the fiber bundle (S) that is drawn in, passes through the rotating pipe (119), and comes out from the outlet (119c). S), but this twist is stopped from propagating upstream (to the pipe inlet (119)') by the needle pin (38) (Fig. 12).
, rotating pipe <119) The wA Ito (S) inside can proceed almost untwisted.

Therefore, the fiber bundle (S) is twisted in the rotating pipe (119) caused by the propagation of the twist upstream, and the fiber bundle (S) is further caused by the propagation of the twist upstream beyond the rotating pipe entrance (119a). rotating pipe (119)
The tip of the fiber bundle (S) is capped (34) in the above manner so that there is no problem such as winding around the entrance part (119a).
The fiber bundles (S ) is immediately suctioned by this suction nozzle (23).

After the fiber bundle (S) is suctioned by the suction nozzle (23), the air injection from the air injection nozzles (3r>i, etc.) is stopped.

The upper thread (rotating pipe (119)) is sucked into the suction pipe (23) through the rotating pipe (119).
(YN) is introduced into the yarn splicing device (6) by turning the suction pipe (23) to the solid line position in Fig. 7, and is threaded by the suction mouth (24). Packages that are also installed (
The thread is spliced with the bobbin thread (YP) on the P) side.

Even during the yarn splicing operation, the yarn (Y) spun from the manufacturing device (15) is sucked by the slack chineave (32) to remove slack.

When the yarn splicing work is completed, the yarn (Y) is transferred to the delivery roller (1
6), the slab catcher (17), and the friction roller (30) in a straight line (Fig. 7).
and is wound up into a package (P).

Note that the circumferential speed of the delivery roller (16) is set slightly higher than the circumferential speed of the front roller (13),
The fiber bundle (S) passing through the manufacturing device (15) is subjected to a spinning process under constant tension.

Next, the spinning process within this manufacturing device (15) will be explained.

That is, as shown in FIG. 8, the fiber bundle (S) passes through the air injection nozzle (12) near the inlet of the rotating pipe (119).
7) It is acted upon by a stream of compressed air that is blown out from and swirls in the direction of the arrow (132), causing it to be slightly twisted in the same direction. Since the fibers located in the center of the fiber bundle (S) are not directly exposed to the air flow, they are untwisted to their original state at a position past the pipe inlet (119, a). On the other hand, fibers located at or near the outer periphery of the fiber bundle (S) (
fl) is directly exposed to the above air flow, and the fiber bundle (S)
The fiber (S) receives a force to separate from the fiber (S).
When the tip of the fiber is at the rotating pipe inlet (119a), the tip is not easily separated because it has been subjected to the above-mentioned false twist, and the rear end of the fiber is at the front roller (13) as shown in the first figure. ) or the nozzle (12
Since it is located far from 7) and is not affected by the air flow much, it has not yet separated.

Subsequently, the rear end of the fiber (fl) is attached to the front roller (1
3) and approaches the air injection nozzle (127>), the fiber bundle (S) is separated from the fiber bundle (S) by the strong force of the air flow from the nozzle (127>).

At this time, the leading end of the fiber (fl) is partially false-twisted, and since it is inserted into a rotating pipe with little air flow, it does not separate, and the trailing end of the fiber (fl) is hardly subjected to false-twisting.
Only a) separates from the fiber bundle (S). The separated rear ends of the fibers are wrapped around the inlet of the rotating pipe (119) once or multiple times by the action of the air flow, and then wrapped around the conical part (119b) a little, and then wrapped around the rotating plate (126). It is guided and extends outward (Fig. 8).

Next, the fiber bundle (S) travels to the left and the rotating pipe (119) rotates in the direction of the arrow (134), so that the rear end (fla) of the fiber (fl)
S) is gradually pulled out while circling around it.

As a result, the fibers (fl) are wound spirally around the fiber bundle (S), and the fiber bundle (S) becomes a bound spun yarn (Y).
The fiber bundle passes through the fiber bundle passage (124).

In the manufacturing process of the yarn (Y) described above, ta fibers (fl)
is separated from the entire outer periphery of the fiber bundle (S)′, and the fiber (
When fl) is separated, the fibers located inside are exposed to the air flow and further separated, so that a large number of fibers are separated in succession. These separated fibers are attached to the outer periphery of the rotating pipe (119) and the conical part (11).
9b) and evenly wrapped around the core fiber. The winding direction of these wrapped fibers (fl) is determined by the rotation direction of the rotating pipe (119), and when the pipe (119) rotates in the direction of arrow (134), it rotates in the Z twist direction and in the opposite direction. When the fibers are twisted, they are wound in the S twist direction.The swirling direction of the air flow by the air injection nozzle (127) does not disturb the winding direction of the wrapped fibers (rl), and the fiber tips are separated by the swirling of the fiber rear ends. It is preferable to set it in the same direction as the rotating direction of the rotary pipe (119) so as to prevent the rotation of the rotating pipe (119).

Figure 9 shows the spun yarn (Y) produced through the above spinning process.
It shows the appearance. The characteristic of this spun yarn (Y) is that it has a basic structure in which the wound fibers (fl) are spirally wound around the core fiber (f2), and both of these fibers (fl) (f
2) In particular, there is little disturbance in the arrangement of the wound fibers (fl). The fiber (f) wrapped around the length of the yarn (Y)
l) The number of threads and the winding angle are uniform, so there is little unevenness in the thread thickness, and there are fewer fuzz and loops.

In addition, in the manufacturing process of the yarn (Y) mentioned above, the tips (fil+) of the fibers on the surface of the fiber bundle (S)
Although there may be cases where the fiber bundle (S) is separated from the yarn and wrapped around the outer periphery of the fiber bundle (S), the yarn (
As far as Y) is observed, the number of wrapped fibers produced in this manner is relatively small, and most of the wrapped fibers appear to have been generated by separation of the rear end of the fiber.

To explain the process in which the fiber tip (fib) is separated from the fiber bundle (S) and becomes a wrapped fiber, the tip is on the surface of the fiber bundle (S) and is easily separated, and the rear end is the fiber bundle (S).
The nozzle (1
When the air flow from 27) is applied, the tip portion of the fiber is separated and wrapped around the rotating pipe (119) before reaching the pipe inlet (119a). At this time, the rear ends of the fibers are not separated and remain in the fiber bundle (S), and then, as the fiber bundle (S) travels and the rotating pipe (119) rotates, the fibers become the fiber bundle (S). It wraps around the outer periphery in a spiral shape to become a wrapped fiber. In this case, the number of windings and the winding angle of the fibers are the same as in the case where the trailing ends of the fibers are separated.

And the above 1i! The yarn strength increases as the number of wrapped fibers wrapped around the outer periphery of the fiber bundle (S) increases, but in the above spinning process, the peripheral speed of the delivery roller (16) is set lower than the peripheral speed of the front roller (13). The fiber trailing edge (fla) during the spinning process was set to be slightly large so that the above process was always carried out under a slight tension state.
separation from the fiber bundle (S) is likely to occur, and a correspondingly larger number of wrapped fibers can be obtained.

That is, in detail, the distance between the front roller (13) and the delivery roller (16) is (L), the maximum fiber length of the handled fiber bundle is (D), the peripheral speed of the delivery roller (16) is (vb), and the front The peripheral speed of the roller (13) is (Va)
Then, (D) > (L) (D, (Vb) C, 1.00X (Va) ~ 1.05X (Va) is a good range, and (D) < (L), (Vb ) is 1.
Good results were obtained in the range of On X (Va) to 1.10 X (Va).

In other words, placing the fiber bundle under a slight tension state during spinning means putting it in a state on the verge of causing so-called shedding, which reduces the binding force of the fiber ends that are restrained in the center of the fibers. It is thought that the fiber ends are likely to separate due to the weak strength.

Also, the package (P) passes the delivery roller (16).
) is wound into a state of zero tension, so the core fiber bundle (f2) (Fig. 9), which is in a state of being tightened under tension, loosens and tries to expand as a reaction. is wrapped around the wound fiber (fl), so the reverse double winding 1 is made by the slack of the core fiber.
m 41 (f 1 ) Kashin Wi ta (f 2
) l: It bites in, and stronger winding can be achieved by the wrapped fibers (fl), which also increases the yarn strength.

Next, considering the process of introducing the fiber bundle (S) sent out from the front roller (13) into the rotating pipe (119) at the start of spinning, the fiber bundle (S) sent out from the front roller (13) is Upper and lower front rollers (1
3), and has a flat shape that spreads from side to side, but this flat fiber bundle (S) is connected to the cylindrical guide passage (11
2) When entering the interior, use the pipe (119)
It is thought that the weir member (39) moves forward while twisting or meandering under the influence of the swirling airflow near the entrance.
(4,0) is a simple cylindrical guide passage (
112), the probability of successfully reaching the inlet of the pipe (119) and being sucked into it is low, but the weir member (
39) (40) By providing the guide passage (
112) The air flow inside becomes a parallel laminar flow (A) with few swirling components, and the flat fiber bundle (S) is well guided and introduced into the inlet of the pipe (119) (Fig. 10). .

The fiber bundle (S) that has reached the inlet of the pipe (119) is sucked into the pipe (119) by the suction airflow near the inlet. As described above, the suction airflow near the inlet (119a) is caused by the swirling flow (B).

Therefore, it is preferable to provide the above-mentioned weir members (39) and (40) above and below the positions shifted back and forth relative to each other as in the above embodiment. Good results cannot be obtained with only one of them, but with three or more Weir member (39) (40)
(42) - may be shifted back and forth and placed in a staggered position up and down (FIG. 11).

Further, the upper sides of the weir members (39) (40) are preferably straight, but may be curved such as circular arcs, and the height (h) of the weir members (39) (40) is A value slightly smaller (approximately 80 to 90%) than 172 of the diameter of the guide passage (112) is preferable, but it may be a value slightly larger or smaller than this value.

In other words, the height (h) of the weir members (39) (40)
) exceeds the above diameter of 172, the fiber bundle (S) will progress in a meandering manner up and down, which will hinder smooth introduction, and conversely, the height (h) will decrease. If it is too large, the above-mentioned guiding effect is considered to be weakened, so in the above example, the height (h) is set so that the horizontal gap width (Fig. 4) of the guide passage (112) when viewed from the front is approximately 1 inch. The results were obtained. In addition, since the needle bin (38) is a pole (a thin metal member), it was found that it does not pose any obstacle to the progress of the yarn in a steady spinning state.

〔Effect of the invention〕

As explained above, the present invention provides a completely new spinning device, and according to the present invention, high-quality spun yarn can be produced at high speed without causing the above-mentioned problems. The introduction of the fiber bundle into the rotating pipe is ensured.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a spun yarn manufacturing apparatus according to the present invention;
Figure 2 is a front view of the rear part of the casing and rotating pipe, Figure 3 is a front view of the nozzle part, Figure 4 is a front view of the guide passage, and Figure 5 is a view taken along the ■-v line in Figure 1. , FIG. 6 is an overall front view of the spinning machine, FIG. 7 is a schematic side view, FIG. 8 is an explanatory diagram showing the manufacturing process of the spun yarn, and FIG. 9 is a diagram showing the appearance of the manufactured spun yarn. FIG. 10 is an explanatory view showing the action of the weir member, FIG. 11 is a longitudinal sectional view showing another example of the weir member, and FIG. 12 is an explanatory view showing the action of the needle bottle. (13) Front roller, (14) Draft device, (15) Spun yarn manufacturing device, (37) Air injection nozzle (38) Needle bin (1'15) Casing, (119) Rotating pipe, (119a) Inlet, (119c) Exit (
124) Fiber bundle passage, (127) Air injection nozzle, (S) -,,,,m Weito.

Claims (1)

[Scope of Claims] A rotary pipe having a fiber bundle passage through which the fiber bundle exiting from a front roller of a draft device passes, and a casing that covers the rotary pipe, the swirling air being swirled from an injection nozzle opened in the casing. This is a device that winds the separated fibers from the fiber bundle around the fiber bundle near the inlet of the rotating pipe to form a spun yarn using a flow, and at the outlet of the rotating pipe, A spun yarn manufacturing apparatus characterized in that a jet nozzle for jetting air in a substantially tangential direction to a fiber bundle path is provided, and a pin for preventing twist propagation that protrudes along the fiber bundle path is provided. .