JPH0860461A - Piecing method - Google Patents

Abstract

PURPOSE: To improve the strength of pieced part and the success percentage of piecing by applying a gyrating air stream for reinforcement to the pieced part simultaneously with the restarting of the spinning operation after reversely passing an end of a spun yarn. CONSTITUTION: In the piecing of a spinning apparatus using a gyrating air stream, the restarting of the spinning operation after a prescribed remedying work of yarn breakage generated during the spinning operation is carried out by reversely passing a yarn end of a spun yarn Y', detwisting the end part in the form of an ear tip, starting a drafting apparatus to start the supply of a sliver and, at the same time, generating a gyrating air stream 106 for spinning. A pieced yarn is formed by joining the fibers of the newly supplied sliver to the opened yarn end fi of the reversely passed spun yarn Y' acting as a seed yarn. An air stream 108 is blasted from a reinforcing nozzle at the downstream side of the acting position of the gyrating air stream 106 for spinning after a prescribed period from the generation of the stream and a reinforcing air stream 107 of the same direction as the spinning air stream 106 is applied for a prescribed period to reinforce the pieced part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an untwisted short fiber bundle drafted by a drafting device, which is acted upon by a swirling airflow to open and twist the short fiber bundle to form a yarn. The present invention relates to a piecing method capable of resuming spinning by passing the yarn end in the reverse direction, and more particularly to a piecing method in which the yarn strength at the seam portion at the time of resuming spinning is strong.

[0002]

2. Description of the Related Art A conventional example of a piecing method capable of resuming spinning by splicing a yarn end after spinning through a spinning portion for forming a spun yarn from a short fiber bundle (sliver) and splicing the yarn (hereinafter referred to as piecing). Japanese Patent Laid-Open Publication No. 6-173129 discloses a spinning device having such a piecing section.

In this spinning device, a swirling air current formed by ejecting a predetermined air pressure from an air nozzle acts on a supplied short fiber bundle to open the short fiber bundle and twist it while spreading it. A spinning unit for forming a yarn is provided. The yarn spun by a normal air spinning device is a yarn in which fibers are twisted around a core yarn so as to be called a binding yarn, but the spun yarn by this spinning device is an excellent spinning that is similar to a real twisted yarn by a ring spinning machine. Yarn can be obtained at high speed.

In this spinning section, spun yarn may not be spun out during the spun yarn formation process, such as when the air nozzles are clogged with short fibers or impurities contained in the short fibers.
In this case, a process to automatically remove short fibers clogging the air nozzle etc. is performed, the yarn end on the package side after spinning is reversely threaded, and a piecing section that allows yarn splicing to restart spinning is provided. It enables automatic restart of spinning.

The piecing section includes means for sucking the spun yarn wound in the package, means for reversing the package, means for guiding and cutting the sucked spun yarn, and a spindle member separated from the nozzle member of the spinning section. Means for transferring the spun yarn to the outlet side of the spun yarn, and means for threading and opening which can be transferred to the inlet side of the short fiber bundle of the spindle member. That is, the spun yarn ends are passed back through the spinning section, the ends are opened, short fiber bundles are supplied to the spun yarn, and both are twisted and spliced together.

[0006]

However, although it is possible to restart spinning by combining the spinning section and the piecing section, there is a problem that the yarn strength at the seam is not sufficient.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a piecing method in which the yarn strength at the seam portion is strong.

[0008]

In order to solve the above-mentioned problems, the piecing method according to the present invention applies a first swirling airflow to the supplied short fiber bundle to twist the short fiber bundle while defibrating it. In a piecing method in which a yarn end after spinning is reversely passed through a spinning portion that forms a yarn to form a yarn, and then spinning is restarted, a second swirling air flow is applied to a joint portion of the yarn. It is a summary.

Further, it is preferable that the second swirling airflow has the same swirling direction as the first swirling airflow.

The second swirling airflow acts on the yarn to be formed on the downstream side of the position where the first swirling airflow acts, and after the start of the action of the first swirling airflow, a predetermined time difference occurs. It is preferred to act for a period of time.

[0011]

[Function] When spinning is restarted, it is necessary to twist the spun fibers of the newly supplied short fiber bundles with the spun fibers at the yarn end after spinning as seeds. Since the action of the first swirl airflow (spinning swirl airflow) immediately after resumption is insufficient and twisting becomes insufficient, the second swirl airflow (reinforcing swirl airflow) is applied to at least the yarn splicing portion to twist. To increase the thread strength.

Further, in this case, if the second swirling airflow is in the same direction as the first swirling airflow, the twisting by the second swirling airflow is further added to the twisting by the first swirling airflow, so that the twisting by the second swirling airflow is stronger. Since the yarn splicing portion is formed and the twisting directions are the same, the portions other than the yarn splicing portion are not adversely affected. Further, when the second swirl airflow is applied to the formed yarn downstream of the position where the first swirl airflow acts, the seed yarn is rotated and twist is added, and When the second swirl airflow is applied for a predetermined time with a predetermined time difference after the action starts, after the yarn splicing by the first swirl airflow is performed, the second swirl airflow is generated only in the yarn splicing portion. Twist is added.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, a spinning device for carrying out the piecing method of the present invention will be described with reference to FIGS. FIG.
4 is a schematic view of an entire spinning device including a spinning unit and a piecing unit, FIG. 2 is a partial cross-sectional view showing a configuration of a main part of the spinning unit of the spinning device of FIG. 1, FIG. 3 is an enlarged cross-sectional view of the spinning unit, and FIG. Is a cross-sectional view of a reinforcing nozzle portion, FIG. 5 is a cross-sectional view showing a state of spinning in a fiber opening nozzle portion, and FIGS. 6 and 7 are partial cross-sectional views showing reverse threading of a yarn end into a spinning portion.

In FIG. 1, which is a side view, the spinning device is
It comprises a spinning unit U and a piecing section P. A large number of spinning units U are arranged in the front-rear direction of the drawing, and the piecing part P runs along the arrangement direction of the spinning units U, detects the spinning units U in which yarn breakage has occurred, and performs yarn splicing. is there. 9a is a lower rail installed on the floor for this purpose, 8a is a wheel which is rotated by appropriate driving means disposed on the piecing device P and runs on the lower rail 9a, and 9b is installed on an upper part of the spinning machine. The upper rails 8b and 8c are wheels arranged above the piecing device P so as to sandwich the upper rail 9b. The spinning unit U is adjacent to the drafting device D and is adjacent to the spinning unit Sp.
And the spun yarn Y formed by the spinning unit Sp is sent to the spun yarn winding unit W via a spun yarn delivery member H including a nip roller Rn and a delivery roller Rd, a slab catcher Z, and wound on a package b. Taken.

Next, the construction and spinning process of the essential parts of the spinning unit U will be described with reference to FIGS. Figure 2
In, the spinning unit Sp includes a nozzle member N and a spindle member S. D is a drafting device arranged upstream of the spinning unit Sp and pulls the short fiber bundle until it becomes thin. The slide L is supplied to a draft device D via a sliver guide T. This draft device D
Is composed of a back roller Rb, a third roller Rt, a second roller Rs having an apron, and a front roller Rf.

The sliver L drafted in the draft device D is a nozzle member N and a spindle member S.
And is formed into a spun yarn Y in the spinning unit Sp. The nozzle member N is the casing 1
And a nozzle n arranged at the inlet of the casing 1, the spindle member S has an inlet side of the casing 1
It is mainly composed of a non-rotating hollow spindle 6 inserted therein and this fixing member 104. The spindle member S is held by a support member h at the tip of the rod r of the cylinder Cs, and is configured to be separable from the nozzle member N as described later.

The spinning section Sp will be described in detail with reference to FIG. First,
The spindle member S, which is a part related to the gist of the present invention, will be described. A portion of the hollow spindle 6 that follows the inlet 6a is a conical portion 6b whose outer diameter increases toward the downstream side, and the hollow spindle 6 has an inner diameter at the inlet 6a.
A hollow passage 7 is formed which is small at 8 and is large (8) at the downstream side. The hollow passage 7 and the respective centers of the casing 1 shown in FIG. 2 are located on the same straight line that coincides with the yarn traveling path. An air reservoir 102 is formed between the fixed member 104 and the hollow spindle 6, and the air reservoir 102 is connected to an air hose (not shown) via an air supply passage 103. In the portion of the hollow spindle 6 where the air reservoir 102 is formed, two reinforcing nozzles 101 that communicate with the air reservoir 102 are provided. This reinforcing nozzle 101 is a sectional view taken along the line AA of FIG.
As shown in (a), it is formed so as to be tangential to the large-diameter portion 8 of the hollow passage 7 and slightly or not to face the downstream side. The reinforcing swirl airflow (second swirl airflow) formed by this nozzle is counterclockwise with respect to the running direction of the yarn, and as described later, the spinning swirl airflow (first swirl airflow) is formed. Swirling air flow). It should be noted that, as shown in FIG. 6B, the swirling direction may be opposite to that of the spinning swirling airflow, and one nozzle may be provided as shown in FIG. 6C.

Next, the nozzle member will be described. Returning to FIG. 3, the portion of the nozzle n that covers the hollow spindle 6 is
It is a hollow chamber having a shape along the outer shape of the hollow spindle 6 and serves as a guide passage for the sliver. On the downstream side, a large hollow chamber 13 is provided by the casing 1 of FIG.
Is formed, and an air escape hole (not shown) is provided following the tangential direction. In the tangential direction of the peripheral wall of the hollow chamber 13, a plurality of, for example, four opening nozzles 3 that are inclined toward the conical tip portion 6a of the hollow spindle 6 are bored. Further, a needle-shaped guide member 5 having a diameter smaller than the diameter of the inlet of the hollow passage 7 of the hollow spindle 6, which is arranged so as to face the inlet of the hollow passage 7, is provided on the inner wall 4 of the nozzle n on the front roller Rf side. The guide member 5 is attached, and a sliver introduction hole 18 is provided near the attachment portion of the guide member 5. In addition, 15 is a compressed air supply body, 16 is an air reservoir for the fiber opening nozzle 3, and the air reservoir 16 is connected to an air hose (not shown) through a hole 17. Here, in the present embodiment, only the opening nozzle 3 is provided as the spinning nozzle, but a twisting nozzle for ejecting a swirling airflow into the hollow passage 7 may be provided near the inlet of the hollow spindle 6 of the passage. is there. In this case, the twisting nozzle is intended to spun the yarn that has been falsely twisted by the opening nozzle 3 and is always acted on. It is intended to reinforce the yarn splicing part and to act only during piecing. Be different.

In FIG. 5, the sliver L sent from the front roller Rf of the draft device D is the opening nozzle 3
From the sliver introduction hole 18 of the nozzle n generated by the action of the jet air 211 from the nozzle n.
It is sucked into the inner hollow chamber 12. Then, the fibers f constituting the sliver L sucked into the hollow chamber 12 are sent along the periphery of the needle-shaped guide member 5, and the fiber f1 near the conical tip portion 6a of the hollow spindle 6 opens the fiber f3. It is separated from the sliver L by the action of the airflow that is ejected from the sliver L and is swirled at the outer periphery 6b of the hollow spindle 6 while being spread and false twisted in the direction of the swirling airflow.

At this time, the fibers f1 separated and spread from the sliver L are almost not core fibers because the needle-shaped guides 5 prevent the core fibers from being formed and are evenly distributed on the outer periphery of the hollow spindle 6. Does not exist, and therefore
Most of the fibers are twisted and wound to form a spun yarn Y in a true twist shape. Further, the false twist applied by the swirling air flow tries to propagate in the direction of the front roller Rf, but the needle-like guide 5 prevents the false twist, and thus the sliver L sent out from the front roller Rf is twisted by the false twist. It will not get stuck. As described above, the false-twisted fiber f1 is sequentially formed into the spun yarn Y and is sent through the hollow passage 7 of the hollow spindle 6 toward the spun yarn winding portion.

Next, the piecing section of the spinning device will be described with reference to FIGS. 1, 6 and 7. In FIG. 1, which is a side view, the piecing part P separates the package b from the friction roller d in order to rewind the spun yarn Y caught in the package b of the spinning unit U in which the yarn breakage has occurred. A package push-out member J for holding the package b, a package reversing member Rw for reversing the package b separated from the friction roller d in a direction opposite to the winding direction, and for pulling out the cut end of the spun yarn Y from the package b. Guide member Su, a guide member Gu for guiding the spun yarn Y drawn from the package b and holding the spun yarn Y at a predetermined position, cutting and gripping the spun yarn Y drawn from the package at a predetermined position, and The spun yarn drawn from the transfer arm member Ta and the package b, which are transferred below the spindle member S. Is configured tip of the threading has been spun yarn Y from the air sucker member As such for defibrating while threading the hollow spindle s of the spindle member S of the spinning section Sp a.

Next, reverse threading of the yarn into the spinning section by the piecing section P will be described. The spinning section S of the specific spinning unit U
When the yarn breakage due to the inner cause occurs, first, as shown in FIG. 2, the cylinder Cs of the spinning portion Sp is operated to advance the rod r to retract the spindle S to the position indicated by the chain double-dashed line and separate it from the nozzle member N. . Next, the piecing section P
Performs the following operations. That is, in FIG. 1, the package extruding member J separates the package b from the friction roller d in order to rewind the spun yarn Y caught in the package b in which the yarn breakage of the spinning unit U has occurred, and the package b is placed at that position. Hold. Next, the package reversing member Rw reverses the package b separated from the friction roller d in the direction opposite to the winding direction.
Next, the guide member Su pulls out the cut end of the spun yarn Y from the package b. Next, the guide member Gu is the package b.
The spun yarn Y drawn from is guided and held at a predetermined position. Next, the transfer arm member Ta cuts and holds the spun yarn Y pulled out of the package at a predetermined position, and transfers the spun yarn Y to a position below the spindle member S of the spinning unit Sp as indicated by a two-dot chain line position.

Next, referring to FIG. 6, the air sucker member As is advanced to the illustrated position, the threading hole 200 is joined to the hollow spindle s of the spindle member S, and the nozzle member is inserted into the threading hole 200 as illustrated. A suction airflow 201 is generated in the N direction to suck the spun yarn Y and thread the yarn in the hollow spindle s. At this time, the suction air flow 201
The spun yarn Y is sent out from the package in accordance with the occurrence of. When the spun yarn Y comes out from the tip of the hollow spindle s for a predetermined length, the spun yarn Y is stopped from being sent out and the generation of the suction air flow is stopped. Next, the air soccer member As is retracted to the position indicated by the two-dot chain line (see the arrow), and the defibrated tube 202 is joined to the hollow spindle s.
The direction of twist of the spun yarn Y into the defibrated tube 202 by sending an air flow from the surroundings into the defibrated tube 202 (see arrow 203)
Is generated, and the tip of the spun yarn Y projecting a predetermined length from the tip of the hollow spindle s is untwisted to form a spike-shaped tip where the fibers are defibrated. Next, the air sucker member As is retracted to the standby position in FIG. As a result, as shown in FIG. 7, fibers are defibrated at the tip of the spun yarn Y. Next, the cylinder Cs is operated to retract the rod r (see the arrow), and the spindle S is joined to the nozzle member N as shown in FIG. At this time, the spun yarn Y is sent out of the package according to the moving distance of the spindle S, and the length of the spun yarn Y protruding from the tip of the hollow spindle s is maintained at a predetermined length.

Next, yarn splicing by a swirling air flow, which is the main feature of the present invention, is performed, which will be described with reference to FIGS. 8 and 9. FIG. 8 is a sectional view showing a yarn splicing state, and FIG. 9 is a time chart showing a yarn splicing operation after resuming spinning. In FIG. 8, from the above state, the back roller is turned on to start the draft device, and the supply of the sliver is started. Immediately after the supply of the sliver is started, the air 21 is discharged from the opening nozzle.
1 is jetted to generate a counterclockwise spinning swirl airflow 106 to start spinning. As a result, the reversely threaded yarn Y'becomes a seed yarn, and the newly supplied fiber is connected to the opened yarn end f1 'to be spun into a continuous yarn. Then, after turning on the spinning whirling airflow 106, the air 108 is discharged from the reinforcing nozzle with a predetermined time difference that is an extremely short time.
Is spouted to generate reinforcing swirling air 107 in the same swirling direction as the spinning swirling airflow 106, and it acts on the yarn Y'reversely passed for a predetermined time and then disappears. By the action of the reinforcing swirling air 107, is rotated in the same direction (arrow 109) and twist is added. The predetermined time difference is set to the time from the start of spinning of the fiber newly supplied to the yarn Y'through which the spinning whirling airflow 106 has been reversely passed until the formation of a yarn splicing portion. The predetermined time for which the reinforcing swirling airflow 107 is applied is set to the time from the start of forming the yarn spliced portion to the end of the formation. Therefore, twisting by the reinforcing swirling airflow 107 is added only to the yarn splicing portion, the yarn strength of this portion is improved, and piecing with a high piecing success rate is achieved.

As described above, as shown in FIGS.
By adopting the reinforcing nozzle shown in (c), the swirling direction of the reinforcing swirling airflow may be opposite to the swirling direction of the spinning swirling airflow. This is because the fibers of the yarn splicing portion of the reversely threaded yarn Y'may be entangled by the action of the swirling airflow, and the purpose is achieved if the action of the reinforcing swirling airflow is larger than the action of the spinning swirling airflow. . However, if both swirling airflows are directed in the same direction, even if the reinforcing swirling airflow acts on parts other than the yarn splicing part, adverse effects will not be exerted, and the twisting by the reinforcing swirling airflow will not be twisted by the spinning swirling airflow. Since it is added, there is an advantage that the yarn strength can be further improved.

Next, this yarn splicing state will be described with reference to the time chart of FIG. In FIG. 9, first, time t1
Then, the back roller Rb is turned on, and the spinning air is turned on at a time t2 immediately after the back roller Rb is turned on to cause the spinning swirling air flow to act. Next, after a predetermined time difference T1,
The reinforcing air is turned on to generate a reinforcing swirling air flow, which is allowed to act for a predetermined time T2 and then disappears. Then, at time t4, the nip roller Rn separated from the delivery roller Rn.
Is brought into contact with the delivery roller to start winding of the spun yarn, and cleaning is performed for a predetermined time T3 from t5 at approximately the same time to complete a series of yarn splicing work.

[0027]

As described above, the piecing method of the present invention allows the yarn end after spinning to be placed in the spinning section where the short fiber bundle supplied is defibrated by the first swirling air flow and twisted to form a yarn. In the piecing method in which the yarn is spliced by restarting the spinning after the reverse passage, the second swirling air current is applied to the spliced portion of the yarn, so that the yarn strength of the spliced portion is improved and the success rate of piecing is improved. Can be increased.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an entire spinning device including a spinning unit and a piecing unit.

FIG. 2 is a partial cross-sectional view showing a configuration of a main part of a spinning section of the spinning device shown in FIG.

FIG. 3 is an enlarged sectional view of a spinning unit.

FIG. 4 is a cross-sectional view of a reinforcing nozzle portion.

FIG. 5 is a cross-sectional view showing a state of spinning in the fiber-opening nozzle portion.

FIG. 6 is a partial cross-sectional view showing reverse threading of a yarn end into a spinning unit.

FIG. 7 is a partial cross-sectional view showing reverse threading of a yarn end through a spinning section.

FIG. 8 is a cross-sectional view showing a state of yarn splicing.

FIG. 9 is a time chart showing the yarn joining operation after the spinning is restarted.

[Explanation of symbols]

 L Sliver (Short fiber bundle) Sp Spinning section T1 Predetermined time difference T2 Predetermined time Y'Yarn after reverse threading (thread end) 106 Spinning swirl airflow (first swirl airflow) 107 Reinforcing swirl airflow (second swirl) air flow)

Claims (3)

[Claims] 1. A yarn end after spinning is reversely passed through a spinning section that applies a first swirling air flow to a supplied short fiber bundle to defibrate and twist the short fiber bundle to form a yarn. A piecing method in which yarn splicing is performed by restarting post-spinning, wherein a second swirling air current is applied to the seam portion of the yarn. 2. The piecing method according to claim 1, wherein the second swirling airflow has the same swirling direction as the first swirling airflow. 3. A yarn end after spinning is reversely passed through a spinning section that applies a first swirling airflow to the supplied short fiber bundle to defibrate and twist the short fiber bundle to form a yarn. In the piecing method in which yarn splicing is performed by restarting post-spinning, the second swirling airflow acts on the yarn to be formed downstream of the position where the first swirling airflow acts, and the first swirling airflow is generated. A piecing method in which the action is performed for a predetermined time with a predetermined time difference after the action starts.