JP2003113539A - Spinning apparatus and piecing method in spinning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinning apparatus which has few mistakes at the previous step of piecing and with which piecing can stably be carried out and the appearance of yarn joint is made more graceful and a piecing method in the spinning apparatus. SOLUTION: This spinning apparatus is equipped with a plurality of spinning units U side by side composed of an (air) spinning nozzle 69 for producing a whirling air current in the surroundings of a tip part 78 of a hollow guide shaft body 70 formed in a yarn route 79 in the axial direction and an auxiliary nozzle (second nozzle hole 86) for producing a whirling air current in the yarn route 79 of the hollow guide shaft body 70 and with a piecing carrier 7 which travels along a plurality of the spinning units U and has a piecing apparatus 6 performing piecing action of the spinning units U.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air spinning nozzle for generating a swirling airflow around the tip of a hollow guide shaft having a thread passage formed in the axial direction, and a yarn guide in the hollow guide shaft. A yarn splicing cart having a yarn splicing device, in which a plurality of spinning units each having an auxiliary nozzle for generating a swirling airflow are arranged in parallel and running along the plurality of spinning units to perform a yarn splicing operation of the spinning units. The present invention relates to a spinning device and a yarn splicing method in the spinning device.

[0002]

2. Description of the Related Art Conventionally, a sliver is continuously supplied to a draft device for drafting, and then the sliver is supplied to an air spinning nozzle which generates a swirling air flow around the tip of a hollow guide shaft, and the swirling air acts on the air spinning nozzle. A pneumatic spinning device is known in which a spun yarn in the form of a real twist is obtained, and the spun yarn is wound by a winding device.

[0003] The pneumatic spinning device usually comprises the above draft device, an air spinning portion consisting of an air spinning nozzle and a hollow guide shaft, and an auxiliary nozzle for generating a swirling airflow in the yarn passage of the hollow guide shaft. There is also known a device in which a plurality of units including a winding device are arranged in parallel, and a yarn splicing carriage that performs yarn splicing in a spinning unit that requires yarn splicing travels along the plurality of units.

Before the winding of one winding package, natural yarn breakage or a yarn defect may be detected by a detector for detecting the yarn forcibly and the yarn may be forcibly cut. It is the yarn splicing cart that does this.

As a form of this yarn splicing, a mechanical splicing device of a yarn splicing cart is equipped with a mechanical knotter.
The spinning side yarn is discharged by the swirling airflow of the air spinning nozzle and the swirling airflow of the auxiliary nozzle, and the spinning side yarn and the winding side yarn are spliced together by the mechanical knotter, or knotting or winding. Send the thread on the take-up side to the outlet of the hollow guide shaft,
Pass it through the hollow guide shaft and spinning nozzle from the opposite direction,
There is piecing in which fiber bundles are supplied from the upstream side, entangled with each other, and drawn into the spinning nozzle to splice yarn.

[0006]

However, the above-mentioned mechanical splicer using a mechanical knotter is insufficient in terms of the appearance of the joint, that is, in that the joint portion is substantially the same as the yarn portion other than the joint, In the yarn splicing by the piecing, the yarn splicing portion is likely to become thick depending on the time of passing the yarn on the winding side from the opposite direction, and when the yarn ends are entangled, the length of the yarn to be piecing is controlled to be constant. Is difficult, and sometimes splicing may fail.

The present invention has been made in view of the above problems, and it is possible to perform stable yarn splicing with few mistakes before the yarn splicing, and to improve the appearance of the yarn seam. An object of the present invention is to provide a spinning device and a yarn splicing method for the spinning device.

[0008]

In order to achieve the above object, an air spinning nozzle for generating a swirling airflow around the distal end portion of a hollow guide shaft body having a thread passage formed in the axial direction,
A plurality of spinning units provided with auxiliary nozzles for generating a swirling airflow in the yarn passage of the hollow guide shaft,
A pneumatic yarn splicing device that runs along a plurality of spinning units and includes a clamp device that clamps the upper yarn and the lower yarn on the winding side of the spinning unit and that performs the yarn splicing operation of the spinning unit by jetting compressed air. And a yarn splicing cart having In the present invention, since the yarn splicing device is the pneumatic yarn splicing device, it is possible to obtain a seam having an appearance better than that of the mechanical knotter by the yarn splicing by the action of the jet air. Furthermore, by stopping the running of the yarn by the clamp of the clamp device and then performing the yarn splicing, the yarn on the winding side is not passed through the spinning nozzle from the opposite direction as compared with piecing. The number of yarns can be reduced and the yarn can be stably spliced.

Upper yarn suction catching means for sucking and grasping the upper yarn on the spinning side and guiding it to the yarn joining device, and lower yarn suction catching means for sucking and grasping the lower yarn on the winding side and guiding it to the yarn joining device. A first drive means common to the upper thread suction / capture means and the lower thread suction / capture means, a second drive means for driving the pneumatic yarn splicing device, and a drive by the first drive means. , Second
It is characterized in that a common control device for the first driving means and the second driving means for starting the driving by the driving means is provided. In the present invention, the driving of the pneumatic yarn splicing device can be started based on the drive by the drive unit common to the upper thread suction / capture means and the lower thread suction / capture means. The operation timing between the driving of the catching means and the pneumatic yarn splicing device can be accurately controlled.

A shutter member is provided on the opening side of the yarn passage, and a yarn slack suction means for sucking and absorbing the yarn slack by opening the shutter, and the control device based on the driving of the second drive means. It is characterized in that a drive means for opening and closing the shutter member is provided. In this invention, the yarn end on the spinning side and the yarn end on the winding side are respectively clamped to stop the traveling of the yarn end on the spinning side, and then the yarn splicing is performed. Based on the driving of, the yarn slack absorption is started immediately before the yarn end on the spinning side is clamped.

An air pressure detecting device for detecting the air pressure of the compressed air supplied to the pneumatic yarn splicing device and transmitting the detection result to the control device, and switching between supplying and stopping the supply of the compressed air based on the detection result. And a switching valve for performing. In the present invention, when the air pressure of the compressed air supplied to the pneumatic yarn splicing device falls below a predetermined value,
The supply of compressed air can be stopped via the control device.

The pneumatic yarn splicing device is capable of untwisting a yarn end, a yarn splicing hole for jetting compressed air to splice yarn, and being able to approach and separate from the yarn end. It has a yarn twisting lever that guides the yarn end to the untwisting nozzle, a yarn splicing hole, a movable blade, a fixed blade, and a clamp plate, and cuts and clamps the yarn end guided by the yarn twisting lever to the untwisting nozzle. It is characterized by having a clamp cutter that performs at the same time. According to the present invention, when the yarn is cut, the cut yarn end is prevented from scattering due to the tension generated by the bending of the yarn path due to the yarn pulling of the yarn pulling lever.

A yarn twisting nozzle for untwisting the yarn end and a yarn pulling lever for guiding the yarn end to the yarn splicing hole guide the yarn end to the untwisting nozzle, and then the yarn end is cut and cut. The yarn end is clamped almost at the same time, and the clamp of the yarn end is released immediately after the separation of the yarn pulling lever from the yarn end is started. According to the present invention, after the yarn is cut, the yarn end is reliably clamped until the tension generated by the bending of the yarn path due to the yarn pulling of the yarn pulling lever decreases.

The time from the start of clamping in the pneumatic yarn splicing to the start of winding after the yarn splicing is 0.90 seconds or less. In the present invention, by performing the yarn splicing in the above time, the appearance of the seam can be made more excellent even during high-speed spinning.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the embodiments without departing from the gist of the present invention.

FIG. 1 is a front view of a spinning device according to an embodiment of the present invention, and FIG. 2 is a longitudinal side view of the same. FIG. 3 is a side sectional view of the pneumatic spinning unit 15 according to the embodiment of the present invention. FIG. 4 is an enlarged view of a main part of FIG. FIG. 5 is a sectional view taken along the line XX of FIG. 6 is a front view of the yarn splicing device 6, and FIG. 7 is a front view of the yarn splicing device 6 with a part thereof omitted. FIG. 8 is a plan view of the same.
FIG. 9 is a plan view of the yarn splicing member 102, and FIGS. 10 to 12 are operation explanatory views of the device 6 showing the process of yarn splicing. FIG. 13 is an enlarged view of a yarn end showing a yarn splicing operation. FIG. 14 is a block diagram showing the control system of the embodiment of the present invention. FIG. 15 is a time chart showing the operation of the yarn joining device 6.

As shown in FIG. 1, the spinning device according to the embodiment of the present invention comprises a plurality of spinning units U arranged side by side between a prime mover box 1 and a blower box 2. A bogie running space 3 is provided along the row of the units U in the machine longitudinal direction of the present spinning device. Inside the space 3, a doffing device 5 equipped with a doffing device 4 and a pneumatic type to be described later in detail. Yarn splicing device 6
A traveling carriage 8 that is integrated with a yarn splicing carriage 7 equipped with is driven. 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 the paper tube to the doffing device 4.

As shown in FIG. 2, the spinning unit U comprises a draft device 1 including a back roller 10, a third roller 11, a second roller 12 and a front roller 13, respectively.
4, a pneumatic spinning unit 15, a nip roller 16 for drawing out the spun yarn Y generated by the spinning unit 15, a slab catcher 17 which is a detector for detecting a thick yarn portion (a yarn defect portion) of the spun yarn Y, and a yarn for the package P. The winding unit 18 is configured to wind Y while traversing Y.

As shown in FIG. 3, each spinning unit U
In the air spinning section 15, the air spinning section 15 twists the fiber bundle 80 sent from the front roller 13 while applying a swirl flow to the fiber bundle 80 and the fiber bundle 80 discharged from the spinning nozzle 69. Therefore spinning nozzle 69
And a hollow guide shaft body 70 provided so as to face each other.

The spinning nozzle 69 has a guide hole 71 for introducing the drafted fiber bundle 80, a needle holder 73 for holding a needle 72 on the flow path of the fiber bundle 80 discharged from the guide hole 71, and a needle holder. A swirl flow generation portion 75 for closely adhering to the downstream side of 73 to cover a distal end portion 74 of a hollow guide shaft body 70, which will be described later, at a predetermined interval, and for generating a swirl flow near the distal end of the hollow guide shaft body 70. Consists of.

The swirl flow generating portion 75 is formed in a cylindrical shape and is concentrically assembled with the needle holder 73. A spinning chamber 76 for applying a swirling flow to the fiber bundle 80 sent from the needle holder 73 is formed inside the swirling flow generating unit 75, and the tip end portion of the hollow guide shaft body 70 is formed in the spinning chamber 76. 74 is accommodated coaxially.

Further, the spinning chamber 76 is provided in the swirling flow generating section 75.
First air spinning nozzle for generating swirling flow inside
A plurality of nozzle holes 77 are formed. First nozzle hole 77
Are small-diameter holes that are connected to the inside of the spinning chamber 76 from the outside in the radial direction of the swirl flow generating portion 75, and the air flows in the counterclockwise direction in plan view along the inner circumference of the swirl flow generating portion 75. It is formed on the tangent line of the spinning chamber 76 so as to flow and is inclined toward the downstream side in the feeding direction of the fiber bundle 80.

The hollow guide shaft body 70 is formed in a tapered, substantially cylindrical shape, and is arranged so that an opening 78 formed at its tip end faces the needle 72.

Further, the spun yarn passage 79 formed in the axial direction of the hollow guide shaft body 70 is formed in a divergent shape toward the yarn discharge side. Specifically, the spun yarn passage 79 is formed by expanding the diameter in multiple stages, and has a small diameter introducing portion 90 extending a predetermined length from the opening 78 toward the discharge side, and an introducing portion 90.
A first expanded diameter portion 81 that is increased in diameter downstream of the first expanded diameter portion 81, a second expanded diameter portion 82 that is smoothly connected to the downstream side of the first expanded diameter portion 81 and that is expanded in a tapered shape, The second diameter-increased portion 82 includes a third diameter-increased portion 83 that is expanded in diameter downstream of the diameter-enlarged portion 82. Third
A discharge port 84 is formed at the discharge side end of the expanded diameter portion 83.

The hollow guide shaft 70 has a fiber bundle 80 swung by a spinning nozzle 69 around the spun yarn passage 79.
It has a suction force generating means 85 for sucking and introducing into the spun yarn passage 79.

As shown in FIGS. 4 and 5, the suction force generating means 85 comprises a plurality of second nozzle holes (auxiliary nozzles) provided in the hollow guide shaft 70 tangentially to the spun yarn passage 79 thereof. ) 86. Second nozzle hole 86
Are arranged at equal intervals along the inner circumference of the spun yarn passage 79 in the clockwise (clockwise) direction 99 in plan view,
It is formed so as to be connected in the tangential direction of the first expanded diameter portion 81.

Further, inside the hollow guide shaft 70, an air passage 87 is formed extending from the vicinity of the discharge port 84 toward the tip side and communicating with each second nozzle hole 86. Air passage 87
Is connected to the compressed air supply passage 88 on the outlet 84 side.

The spinning unit U is arranged on a frame body 19 having a U-shaped cross section, and the yarn splicing carriage 7, that is, the traveling carriage 8 is mounted on the rail 2 in the carriage traveling space 3 surrounded by the frame body 19.
The vehicle travels in the left-right direction in FIG.

The yarn splicing cart 7 has a spinning side (pneumatic spinning section 15).
Side), a suction pipe (upper thread suction / capturing means) 23 for sucking and gripping the upper thread and guiding it to the thread splicing device 6, and a package P.
A suction mouth (lower thread suction / capturing means) 24 for sucking and grasping the lower YP on the (winding) side and guiding it to the yarn splicing device 6 is provided so as to be respectively rotatable as shown by the one-dot chain line in FIG.
The proximal ends of the suction pipe 23 and the suction mouth 24 are connected to a blower motor (not shown) for generating a suction force via a duct (not shown) provided in the yarn splicing carriage 7. As a result, the suction pipe 2
3 and the suction mouth 24 appropriately suck the yarn end. In addition, the suction mouse 2
A sensor SE1 is provided as a detection device for detecting the turning of the suction mouth 24 within the range in which the 4 turns.

Reference numeral 31 is a slack tube (thread slack sucking means) consisting of an elongated cylindrical tube whose tip is open in the thread passage between the nip roller 16 and the slab catcher 17,
A shutter member 31a is provided on the opening side of the thread passage. The shutter member 31a is a solenoid SOL which is a driving means.
The slack tube opening 31 is normally closed as shown by the alternate long and two short dashes line. However, regarding the slack tube 31, for example,
The proximal end side of the slack tube 31 may be formed in a spiral shape so that the effective length for sucking the thread becomes long. The slack tube 31 has a connection opening to the suction duct 27 extending along the unit U in the space 3. Reference numeral 30 is a friction roller that contacts the package P and rotates.

In FIG. 2, the sliver S supplied to the draft device 14 is pulled out from the sliver can 33 provided on the back of the machine base, and is supplied to the back roller 10 via the guide rollers 34 and 35. 36 is laid through the entire spinning unit U, and is provided with a draft device 14 and an air spinning unit 1.
5 is a discharge pipe for sucking and discharging cotton wool and yarn waste, and 37 is a compressed air pipe for supplying compressed air for operation of the yarn splicing device 6 described later, which is also laid through all the spinning units U. The compressed air pipes 37 are provided with branch pipes 38 projecting at the same intervals as the units U, and a valve device 39 connected to the yarn splicing carriage 7 is provided at the tip of the branch pipes 38. Reference numeral 41 is a supporting frame member that extends along the unit U row and supports the valve device 39.

Next, the yarn splicing device 6 mounted on the yarn splicing carriage 7 will be described with reference to FIGS.

The yarn splicing member 102 located substantially in the center of the yarn splicing device 6 is fixed to the bracket 103 by a screw 104, and a cylindrical yarn splicing hole 105 is formed in the center of the yarn splicing member 102. There is. A slit 106 suitable for inserting the yarn Y from the outside is formed in the yarn splicing hole 105 over the entire tangential direction of the yarn splicing hole 105, and further, in the yarn splicing member 102, a jet that is tangentially opened in the yarn splicing hole 105. The nozzle 107 is bored. Further, the yarn splicing member 102 has control plates 112 and 113 fixed to the side wall surface of the open hole of the yarn splicing hole 105 via a spacer (not shown). Is positioned so as to cross a part of the opening of the.

The control plates 112 and 113 position the two yarn ends, that is, the yarn end YP on the winding side and the yarn end YN on the air injection nozzle 15 side, which are inserted into the yarn splicing hole 105 together with the yarn pressing lever 116 described later. When the air is jetted from the jet nozzle 107, the yarn splicing hole 105 is positioned at a position that ensures the first entanglement of the yarn ends YP and YN, and
The amount of air flowing out from the openings at both ends of the yarn is controlled, and the yarn ends YP and YN
It has a function of preventing the pop-out of the resin, and further obtains a seam with a beautiful appearance by an appropriate swirling flow. Also,
The spacers are provided to prevent compressed air from hitting the walls of the control plates 112 and 113 and flowing out toward the slits 106, and to prevent the yarn ends YP and YN from jumping out of the slits 106. A gap is formed between the wall surface and the control plates 112 and 113 to control the flow rate of air from the slit 106. The air is supplied to the injection nozzle hole 107 from the compressed air pipe 37 and the conduit 117. The thread pressing lever 116 described above.
Are composed of a pair of upper and lower parts, and are pivotally supported by the bracket 103 by a support shaft.

The control plate 112 of the yarn splicing member 102,
Guide pins (not shown), a yarn pressing lever 116 (see FIG. 13), a untwisting nozzle 124, which are close to 113 on both sides of the opening of the yarn splicing hole 105 of the yarn splicing member 102,
125 and thread guides 126, 127, and the movable blade 12
8a, 129a, fixed blades 128b, 129b, clamp plates 128c, 129c, clamp cutters 128, 129 for clamping the yarn end almost simultaneously with the cutting of the yarn, fork guides 130, 131 are sequentially arranged, and a yarn splicing member A pair of thread shifting levers 133, 133 fixed to the upper and lower portions of the support shaft 132 and pivoting are arranged on the side of the shaft 102. Reference numeral 134 is a stopper of the thread shifting lever 133. A clamp device 135 for the package yarn end YP includes a fixed lever 136 and a movement stopper 137. 1
Numeral 38 is a clamp device for the spinning side yarn end YN, which is a turning lever 1
It consists of 39 and a stopper.

As shown in FIG. 8, the fixed lever 136 is bent at its tip to guide the yarn end YP on the winding side, and the turning lever 201 at the opposite position turns (arrow 2).
02) the yarn end YP guided by the fixed lever 136 by
Is moved between the movement stopper 137 and the movement stopper 137.

Since the untwisting nozzles 124 and 125 have the same shape, one untwisting nozzle 125 will be described next with reference to FIG. Reference numeral 145 is a nozzle hole formed in the bracket 103 and the block 146 integrated with the bracket 103, and a tubular sleeve 147 is fitted therein so as to be slidable in the axial direction of the nozzle hole 145. The sleeve 147 is connected to a flexible pipe 148 connected to a suction pipe (not shown). An injection hole 149 is provided facing the inner side of the tubular sleeve 147. The injection hole 149 is the block 1
It communicates with a pressure conduit (not shown) through an air introducing hole 150 provided in the valve 46.

During the yarn splicing operation, the suction pipe 2
3. The turning operation of the suction mouth 24 is performed by driving the motor M1 as the first driving means and the operation of the yarn splicing device 6 including the yarn pressing lever 116, the yarn pulling lever 133 and the like as shown in FIG. The driving is performed by driving a motor M2, which is a driving unit, to rotate separate cams (not shown) respectively connected to the motors M1 and M2. Further, a control unit 300 is provided as a control device that commonly controls the drive of the motors M1 and M2 so as to start the drive of the motor M2 based on the drive of the motor M1. As a result, as compared with the case where the turning operation of the suction pipe 23 and the suction mouth 24 and the operation of the yarn splicing device 6 are mechanically coordinated, the mutual motions can be coordinated more accurately, and the timing setting can be easily changed. You can do it. In high-speed spinning, even a minute time lag in operation has a great effect on the seam of yarn splicing. Therefore, especially in high-speed spinning, it is effective that the controller 300 can prevent the occurrence of operation deviation. Here, in the embodiment of the present invention, the control unit 30.
0 is a sensor S that detects the turning of the suction mouse 24.
The detection result of E1 can be received. That is, the motor M
Looking at the drive of 1 from the operation of the suction mouse 24,
Based on the result, the control unit 300 starts driving the motor M2.
Controls the opening / closing of the shutter member 31a by driving the solenoid SOL based on the driving of the motor M2.

A supply air pressure detection sensor SE2 and a untwisting nozzle 124, 1 of the yarn splicing device 6 are provided in the middle of a pressure conduit (not shown).
Switching valve X1 in the middle of the pressure conduit connected to 25, and switching valve X1 in the middle of the pressure conduit connected to the injection nozzle 107
2 is provided, and the control unit 300 can receive the pressure detection result of the supply air pressure detection sensor SE2. The control unit 300 performs the air supply / air supply stop switching control of the switching valve X1 and the switching valve X2 based on the detection result of the sensor SE2.

Therefore, the yarn joining device 6 operates as follows to perform yarn joining. That is, when the yarn splicing for starting the spinning device, the slab catcher 17 senses a yarn breakage, or a yarn defect is detected to automatically cut the traveling yarn of the unit U, the yarn splicing carriage 7 Is the unit U
14 is started, the driving of the motor M1 shown in FIG. 14 is started, the winding-side suction mouth 24 sucks the yarn end YP from the package P, and the suction pipe 23 on the spinning section 15 side immediately after the air spinning section 15. The yarn end YN on the spun side is sucked, and both are swung from the alternate long and short dash line in FIG. 2 to the position shown by the solid line to introduce the yarn ends YP and YN into the yarn splicing device 6.

More specifically, the draft device 14 and the pneumatic spinning portion 15 are driven together with the suction force generating means 85, and the yarn splicing carriage 7 is run to the spinning unit 2 to be spliced.

The sliver S is stretched by the draft device 14 and formed into a fiber bundle 80 shown in FIG. The fiber bundle 80 sent to the pneumatic spinning unit 15 is
The needle holder 73 is inserted through the guide hole 71.

At this time, in the air spinning section 15, compressed air is jetted from both the first nozzle hole 77 and the second nozzle hole 86. Here, in each second nozzle hole 86,
Compressed air is supplied from the compressed air supply passage 88 via the air passage 87 communicating with the nozzle hole 86.

The first nozzle hole 77 is formed so as to be inclined toward the downstream side of the fiber bundle 80 in the feeding direction, and the compressed air jetted from the first nozzle hole 77 swirls and flows in the feeding direction of the fiber bundle 80. The fiber bundle 80 inserted through the guide hole 71 of the needle holder 73 is sent to the vicinity of the opening 78 of the hollow guide shaft body 70 while being loosely twisted by a swirling flow.

Further, the compressed air injected from 86 flows along the inner peripheral surface in the spun yarn passage 79 formed in the hollow guide shaft body 70 to form a swirling air flow.

Since the spun yarn passage 79 is formed in a divergent shape toward the discharge side of the spun yarn Y, the compressed air injected into the spun yarn passage 79 through the second nozzle hole 86 is spun. The yarn Y flows toward the discharge side, and has a thin introduction portion 9
0 is negative pressure. Therefore, the hollow guide shaft body 70
A flow of air in the suction direction (direction toward the inside of the hollow guide shaft body 70) is generated in the opening 78 formed at the tip of the. Thereby, the fiber bundle 80 can be continuously drawn.

The fiber bundle 80 in the false twist state sent to the vicinity of the opening 78 of the hollow guide shaft 70 is sucked into the spun yarn passage 79 in the opening 78 by the suction flow from the opening 78.

Then, the fiber bundle 80 reaches the first expanded diameter portion 81 and is exposed to a swirling flow in the direction opposite to that of the spinning nozzle 69.
For this reason, the fiber bundle 80 in the loose false twist state is spun into a bundled fiber state by the known spinning technique of manufacturing spun yarns with the rotating nozzles in opposite directions, and is discharged from the hollow guide shaft body 70 as a bundled spun yarn 97. To be done. This is referred to as "yarn discharge spinning" in the present specification. The swirl flow from the first swirl nozzle 77 is changed by the swirl flow to the fiber bundle 80.
Is prevented from being swung excessively and stable yarn discharge spinning is carried out. Therefore, the compressed air injected is kept at a low pressure for a predetermined time after the operation of the first turning nozzle 77, and then switched to a high pressure (air pressure during normal spinning). Is preferred.

More specifically, most of the fiber bundle 80 sent to the position of the second swirl nozzle 86 is twisted with the needle 72 by the twisting action of the second swirl nozzle 86 and is bundled as core fibers. It On the other hand, the remaining fibers which are not twisted by this and do not form the core fiber are wound around the core fiber in that direction by the swirling flow of the first swirling nozzle 77. The twist imparted to the core fiber by the second swirl nozzle 86 starts untwisting when it passes through the second swirl nozzle 86. This untwisting is in a direction opposite to the swirling direction of the second swirling nozzle 86, that is, in the same direction as the swirling direction of the first swirling nozzle 72. Therefore, the unwound fiber causes the wound fiber to be more strongly wound around the core fiber, and the unwound fiber is wound around the untwisted core fiber by the unwound fiber 97. Is generated.

The second nozzle hole 86 is formed by the front roller 1
It is preferable to make the nip point of the fiber bundle 80 of No. 3 as close as possible. This is because, at the time of yarn discharge spinning, the fiber bundle 80 discharged from the front roller 13 is sucked with a stronger suction force.
And the twisting due to the swirling airflow of the second nozzle hole 86 is propagated to the vicinity of the front roller 13 as much as possible (the twisting propagation is prevented by the needle 72 during normal spinning), and the plurality of fibers are further twisted. Strongly bundling unit 1
It is also for reducing the fiber loss by feeding the fiber to the fiber.

On the other hand, when the yarn end is discharged from the hollow guide shaft body 70, the yarn end YN which is the bound spun yarn 97 discharged from the hollow guide shaft body 70 in the yarn splicing carriage 7 that has arrived in advance. The suction pipe 23 sucks and guides it to the yarn splicing device 6.

While guiding the yarn end YN, which is the bound spun yarn 97, by the suction pipe 23, the bound spun yarn 97 is sandwiched between the nip rollers 16 that are continuously rotating, and stable feeding is performed. Then, the suction force generation means 85 is stopped. As a result, the swirling flow in the hollow guide shaft body 70 disappears, and the spinning of the bundled fibers is completed, and the spinning of the actual twisted yarn is started by the normal spinning state, that is, the swirling flow from the first nozzle hole 77.

When the yarn on the supply side is delivered from the suction pipe 23 to the yarn splicing device 6, all of the bundled spun yarn 97 is sucked into the suction pipe 23, and the spun yarn in the real twist state is delivered to the yarn splicing device 6. Be done.

The turning of the pair of suction members 23, 24 is not performed at the same time. First, the spun-side yarn end YN is sucked by the suction pipe 23, turns to the outer position of the yarn splicing device 6 and stops, and a predetermined position is reached. After a lapse of time, the yarn YP on the winding side is sucked by the suction mouth 24 and the yarn splicing device 6
Turn to the position outside of and stop.

After the suction pipe 23 is activated, the suction mouth 24 sucks the winding-side yarn end YP, pivots to the position outside the yarn splicing device 6, and stops. Here, the sensor SE2 detects the turning position of the suction mouth 24, and based on the detection result, the control unit 300 in FIG. 14 controls the motor M2 to start driving the yarn splicing device 6. Furthermore, based on the drive of this motor M2,
Specifically, after a predetermined time has elapsed from the start of driving the drive motor M2, the control unit 300 opens the shutter member 31a of the slack tube 31 from the closed state (the position indicated by the chain double-dashed line in the figure) with respect to the solenoid SOL ( Control is performed to switch to the state shown by the solid line in the figure). As a result, the slack tube 31 starts to absorb the yarn slack on the spinning side (FIG. 1).
5 hours T1). Then, the yarn YP is the turning lever 20.
1 is introduced between the stopper 137 and the lever 136 of the clamp device 135 and immediately clamped.

As described above, in the embodiment of the present invention, the drive of the motor M2 is started based on the detection of the turning position of the suction mouth 24. However, for example, a sensor for detecting the turning position of the suction pipe 23 is provided. , The motor M2 based on the detection result of the turning position of the suction pipe 23.
May be driven. In addition, a detection unit that detects the rotation angle of the motor M1 may be provided, and the motor M2 may be driven based on the rotation angle of the motor M1.

As shown in FIG. 8, the yarn clamp device 13 on the spinning side
The swiveling lever 139 of No. 8 operates to move the yarn YN to the swiveling lever 1
The yarn that is introduced between the stopper 39 and the stopper 140 and is spun from the air jet nozzle 15 by the clamp of the yarn end YN by the clamp device 138 is sucked into the slack tube 31 for its accumulated portion. As shown in FIG. 15, the timing T1 for absorbing the yarn slack by the slack tube 31 is immediately before the time T2 when the clamp device 138 clamps the yarn end YN. This timing is set in advance by the control unit 300, and a slight slack can be absorbed in advance by sucking the yarn on the spinning side immediately before the clamping by the clamping device 138, so that the clamping device can be absorbed. It is possible to prevent the occurrence of chatter due to the occurrence of abrupt slack when the clamp by 138 is started. Further, the clamp device 135, so that the amount of slack sucked into the slack tube 31 is as short as possible,
The pinching timing of the yarn ends YP and YN by 138 is set. Here, for example, the clamp devices 135, 138
As shown in FIG. 15, it is preferable to set the clamp timing of the yarn ends YP and YN by the clamp device 138 on the yarn end YN side to be later. As a result, it is possible to further minimize the length of the pool of the yarn spun out from the air jet nozzle 15 by the clamping of the yarn end YN by the clamp device 138, as short as possible. Because you can.

Since it is inevitable that the yarn ends YN and YP are twisted together, the untwisting nozzles 124 and 12 for the yarn ends YN and YP are set by the above-mentioned procedure.
As for the untwisting time within 5, the yarn end YN side is shorter than the yarn end YP, and the winding side yarn end YP is more sufficiently untwisted.
Clamp cutter 12 is used to cut both thread ends that have been clamped.
8, 129 fixed blades 128a, 129a, movable blade 128
b, 129b respectively.

The above-mentioned winding side and spinning side suction member 2
When the operations of 3 and 24 are completed, the thread shifting levers 133 and 1
33 pivots around the spindle 132 as a fulcrum, and the yarns YN on both sides are
YP is each guide groove 14 of the fork guides 130 and 131.
1, 142 are separately guided and inserted through the slit 106 into the yarn splicing hole 105 of the yarn splicing member 102.

Next, the movable blades 128a and 129a of the clamp cutters 128 and 129 are swung around a rotation shaft (not shown), and the fixed blades 128b and 129b are used to remove a predetermined amount from the winding side clamping device 135 and the spinning side clamping device 138. At the distance position, thread cutting is performed as shown in FIG. 7 (time T3 in FIG. 15). At this time, since the portion of the bundled spun yarn 97 of the yarn end YN is all sucked into the suction pipe 23, the bundle spun yarn 97 is removed by this cutting, and a normal spinning state is started and the yarn splicing device 6 The portion of the real twisted yarn that has been passed over to the yarn end and the yarn end YP on the winding side, which is also a real twisted yarn, are spliced. Therefore,
Only the true twisted yarn is wound around the package P.

That is, in FIG. 10, the yarns YN, Y on both sides are
P is clamped on the thread clamp devices 135 and 138,
Moreover, the thread shifting lever 133 is actuated, and the thread shifting lever 133 is operated.
Is rotated in the clockwise direction around the support shaft 132 as a fulcrum, approaches the yarn ends YN and YP, and guides the yarn ends YN and YP toward the untwisting nozzles 124 and 125. Movable blades 128a, 129a, fixed blade 12
Almost at the same time when the yarn cutting is performed by 8b and 129b, the movable blades 128a and 129 which remain in the rotated state are provided in addition to the clamping by the clamping devices 135 and 138.
The yarn ends YN and YP are clamped by being sandwiched between a and the clamp plates 128c and 129c (see FIG. 7, time T3 to T5 in FIG. 15). At this time, as shown in the drawing, the yarn ends YN, Y
In P, the yarn path is bent by the turning of the yarn shifting lever 133,
The tension is applied. In addition, the thread shifting lever 133
During operation of the clamp cutters 128 and 129, the thread pressing lever 116 is located in a state of being rotated in the clockwise direction around a support shaft (not shown) as a fulcrum.

Next, as shown in FIG. 11, after the yarn twisting nozzles 124 and 125 apply a suction force to the yarn ends YN and YP in advance, the above-described yarn pulling lever 133 moves away from the yarn, that is, the spindle 132 is used as a fulcrum. Then, it turns counterclockwise and starts to separate from the yarn Y (time T4 in FIG. 15). At this time, the tension applied by the bending of the yarn ends YN and YP decreases. Then, when the tension immediately after the yarn pulling lever 133 starts separating from the yarn ends YN and YP is reduced, the movable blade 1
When the clamp is released by turning 28a and 129a in the direction of moving away from the fixed blades 128b and 129b and the clamp plates 128c and 129c (shown by the broken line in FIG. 11, time T5 in FIG. 15), the yarn ends YN and YP are , Sleeve 14 connected via flexible pipe 148
7 is surely sucked into the untwisting nozzle 125 by the suction action of the sleeve 7, and the sleeve 147 is passed through the air guide hole 150 described above.
The twisting is unraveled to a state suitable for yarn splicing from the injection holes 149 of the compressed air injected through the switching valve X1.

Here, after the thread cutting, the thread ends YN and YP are clamped by the clamp cutters 128 and 129 until the thread tension lever 133 starts to separate from the thread Y and the tension is reduced until time T5. When done, the cut thread end Y
N and YP are scattered by the tension generated by the bending of the yarn path, and are separated from the untwisting nozzles 124 and 125 to reduce the success rate of sucking the yarn ends YN and YP into the untwisting nozzles 124 and 12. This is for sure prevention.

The suction timing of the untwisting nozzles 124 and 125 is preferably started in advance immediately before the yarn is cut by the clamp cutters 128 and 129. That is,
Since the yarns YN and YP are clamped by the clamp cutters 128 and 129, the yarn ends YN and YP are scattered by releasing the clamps and the untwisting nozzles 124 and 12 are released.
There may be a case where the yarn ends YN and YP are not sucked by the untwisting nozzles 124 and 125 because they are separated from the fifth position.

Further, at the same time or after the suction action of the untwisting nozzles 124, 125 is stopped by untwisting the yarn ends YN, YP by the untwisting nozzles 124, 125 to a state suitable for yarn splicing. As shown in FIG. 12, the yarn pulling lever 133 is actuated again to guide the yarn ends YN and YP to pivot to the position where one lever 133 contacts the stopper 134 and the yarn pressing lever 116 is actuated. Similarly, while guiding the yarn ends YN and YP, the yarn is turned to a position where it comes into contact with the surface of the bracket 103, and the yarn is pressed by one of the levers of the yarn pressing lever 116, that is, compressed air jetted from the jet nozzle 107 of the yarn splicing member 102. The yarn Y is twisted by the lever on the side where the twist of Y is untwisted.
N and YP are gripped to the extent that untwisting is suppressed, and the other fork side does not need to be gripped because the compressed air acts in the direction in which the yarn YN and YP are twisted. It is sufficient to hold down the clamp to the extent that it is regulated.

The yarn ends YN and YP sucked into the sleeves 147 of the untwisting nozzles 124 and 125 by the operation of the yarn pulling lever 133 and the yarn pressing lever 116 are drawn into the yarn joining hole 105 of the yarn joining member 102, The positioned yarn end portions to be spliced are set in a state in which the yarn end portions are overlapped with each other, that is, in the state shown in FIG. This time,
The length of the seam to be spliced is set by the turning distance of the thread shifting lever 133 and the thread pressing lever 116.
Therefore, the turning distances of the thread shifting lever 133 and the thread pressing lever 116 are adjusted by the thread count.

The yarn ends YN and YP pulled out from the sleeve 147 of the untwisting nozzles 124 and 125 by the turning of the yarn pulling lever 133 are pulled out while being regulated by the control plates 112 and 113 on both sides of the yarn splicing hole 105. The side edges of the plates 112 and 113 and the side edge of the thread pressing lever 116 are positioned on the inner peripheral surface of the yarn splicing hole 105, and the splicing portions are set in the yarn splicing hole 105 in a state of being in contact with each other and overlapping.

Further, the yarn ends YN and YP are connected to the yarn splicing hole 10.
When the switching valve X2 is switched in the state of being set in 5, the yarn splicing is performed by the action of the compressed air jetted from the jet nozzle 107. At this time, the injection nozzle 1
Fibers of both yarn ends contacted by air injection from 07 are entwined and integrated prior to turning, and then twisted to impart entanglement on both sides of twisting and twisting to the integrated yarn end, Since the twisting action of the twisting nozzles 124 and 125 has stopped, the yarn splicing is performed without causing any resistance to the twisted yarn end tip and without completely forming entangled corners.

Here, the above-mentioned untwisting nozzles 124, 12
5. If the compressed air supplied to the jet nozzle 107 has a pressure lower than a predetermined value, untwisting and twisting of the yarn ends YN and YP will not be sufficient, resulting in a defective joint. Therefore, in the embodiment of the present invention, the supply air pressure detection sensor shown in FIG. 15 detects whether the supply air has a predetermined value, and if it is below the predetermined value, the control unit 300 causes the untwisting nozzle 124, 125, the air supply stop control is performed on the switching valves X1 and X2 of the injection nozzle 107 so that the air required for yarn splicing is not injected.
As a result, it is possible to prevent the generation of defective joints in advance.

When the above splicing is completed, the thread shifting lever 1
33 and the yarn pulling lever 116 are separated from the yarns YN and YP, and YN and YP pass through the slit 106 of the yarn splicing member 102 to the outside, and the rotation of the friction roller 30 is started, whereby the normal spinning operation is performed. It will be restarted. Here, the opening time T6 for clamping the yarn end by the clamp device 135 is earlier than the opening time T7 for clamping the yarn end YN by the clamp device 138. This is to shorten the clamping time of the yarn end YN by the clamp device 138, and also to shorten the amount of looseness of the yarn due to the clamping of the yarn end YN.

In the yarn splicing by the yarn splicing device 6, from the start of clamping the spinning side yarn end YN by the clamp device 138 to the start of winding by the rotation start of the friction roller 30 after the yarn splicing. The running stop time of the yarn end YN is preferably 0.90 seconds or less. In the yarn splicing of the embodiment of the present invention, for example, the slack tube 31
It takes about 0.05 seconds from the start of the suction of the yarn Y to the clamp by the clamp devices 135, 138, and the yarn cutting and the clamp by the clamp cutters 128, 129 from the clamp,
It takes about 0.15 seconds from the opening of the clamp until the start of untwisting by the untwisting nozzles 124 and 125, and after the untwisting, the yarn ends YN and YP are drawn into the yarn splicing hole 105 and the yarn splicing is performed. It takes about 0.25 seconds until the start of (the actual untwisting time with the untwisting nozzles 124, 125 is about 0.1
5 seconds), the yarn splicing at the yarn splicing hole 105 is about 0.15 to 0.2.
Seconds (change depending on the yarn count), the time from the splicing of the yarn to the start of rotation of the friction roller 30 is performed in about 0.05 seconds or less, and the running stop time of the yarn end YN is about 0.60 to 0.
It takes about 65 seconds. As a result, the spinning speed is about 350 per minute.
It is possible to obtain excellent seams even at m or more. However, the present invention is not limited to this, and it is desirable that the yarn traveling is performed in a short time so that the yarn traveling stop time is as short as possible.

As described above, the pneumatic spinning unit 15 in the embodiment of the present invention is not limited to the above. For example, the hollow guide shaft body 70, the front external cylinder body including the tip portion 74 and the introduction portion 90, and the rear external cylinder body to which the compressed air supply passage 88 is connected,
The first outer diameter portion 81, the second diameter enlarged portion 82, the third diameter enlarged portion 83, and the inner cylindrical body including the second nozzle hole 86 are formed as separate bodies and are fitted to each other to form the front outer cylinder. The air passage 87 may be formed by a gap between the body, the rear outer cylinder, and the inner cylinder. Moreover, the fitting may be detachable via a sealing member such as an O-ring to prevent air leakage. Further, the second swirling nozzle 86 is replaced with the first expanded diameter portion 8
It may be configured to be inclined toward the downstream side with respect to the plane orthogonal to 1. Further, like the second swirling nozzle 86, the swirling flow does not necessarily have to be connected in the tangential direction of the first expanded diameter portion 81.

[0073]

Since the present invention is constructed as described above,
The following effects are achieved.

An air spinning nozzle for generating a swirling airflow around the tip of a hollow guide shaft having a thread passage formed in the axial direction, and an auxiliary nozzle for generating a swirling airflow in the yarn passage of the hollow guide shaft. A plurality of spinning units arranged in parallel with each other, and a clamp device that runs along the plurality of spinning units and clamps the upper yarn and the lower yarn on the winding side to perform spinning by jetting compressed air. Since the yarn splicing carriage having the pneumatic yarn splicing device for performing the yarn splicing operation of the unit is provided, it is possible to obtain a seam having a better appearance than the mechanical knotter by the yarn splicing by the action of the jet air. Further, as compared with piecing, the yarn on the winding side does not pass through to the spinning nozzle from the opposite direction, so mistakes in the pre-splicing stage can be reduced and stable splicing can be performed.

Upper yarn suction catching means for sucking and grasping the upper yarn on the spinning side and guiding it to the yarn joining device, and lower yarn suction catching means for sucking and grasping the lower yarn on the winding side and guiding it to the yarn joining device. A first drive means common to the upper thread suction / capture means and the lower thread suction / capture means, a second drive means for driving the pneumatic yarn splicing device, and a drive by the first drive means. , Second
By providing a common control device for the first driving means and the second driving means for starting the driving by the driving means, the driving of the upper thread suction catching means and the lower thread suction catching means, and the pneumatic yarn splicing device. Since the operation timing between and can be controlled with high precision, the appearance of the joint can be made more excellent and the setting of the operation timing can be easily changed.

A shutter member is provided on the opening side of the yarn passage, and a yarn slack suction means for sucking and absorbing yarn slack by opening the shutter, and the control device based on the drive of the second drive means. By providing a driving means for opening and closing the shutter member and starting absorption of the looseness of the yarn immediately before clamping the yarn end on the spinning side, it is possible to prevent the occurrence of chattering during clamping.

An air pressure detecting device for detecting the air pressure of the compressed air supplied to the pneumatic yarn splicing device and transmitting the detection result to the control device, and switching between supply and stop of supply of the compressed air based on the detection result. By providing a switching valve for performing the above, when the air pressure of the compressed air supplied to the pneumatic yarn splicing device falls below a predetermined value, the supply of the compressed air is stopped via the above-mentioned control device to prevent the yarn splicing failure from occurring. It can be prevented in advance.

The pneumatic yarn splicing device has a detwisting nozzle for untwisting the yarn end, a yarn splicing hole for injecting compressed air to splice the yarn, and can approach and separate from the yarn end. It has a yarn twisting lever that guides the yarn end to the untwisting nozzle, a yarn splicing hole, a movable blade, a fixed blade, and a clamp plate, and cuts and clamps the yarn end guided by the yarn twisting lever to the untwisting nozzle. By providing the clamp cutter that is performed at the same time, it is possible to reliably guide the yarn end to the untwisting nozzle and increase the success rate of yarn splicing.

The untwisting nozzle for untwisting the yarn end, the yarn end lever for guiding the yarn end to the yarn splicing hole guides the yarn end to the untwisting nozzle, and then the yarn end is cut to obtain the cut yarn end. The yarn end clamp is clamped almost simultaneously, and the yarn end clamp is released immediately after starting the separation of the yarn pulling lever from the yarn end, thereby more reliably guiding the yarn end to the untwisting nozzle, and The success rate can be increased.

By setting the time from the start of clamping in the pneumatic yarn splicing to the start of winding after the yarn splicing is set to 0.90 seconds or less, the appearance of the seam is improved even in high-speed spinning. Can be something.

[Brief description of drawings]

FIG. 1 is a front view of a spinning device according to an embodiment of the present invention.

2 is a vertical side view of FIG.

FIG. 3 is a side sectional view of a spinning unit according to the embodiment of the present invention.

FIG. 4 is an enlarged view of a main part of FIG.

5 is a cross-sectional view taken along the line XX of FIG.

FIG. 6 is a front view of the yarn splicing device.

FIG. 7 is a front view of the yarn splicing device with some parts omitted.

FIG. 8 is a plan view of FIG.

FIG. 9 is a plan view of a yarn splicing member.

FIG. 10 is an operation explanatory view of the device showing a process of yarn splicing.

FIG. 11 is an operation explanatory view of the device showing the process of yarn splicing.

FIG. 12 is an operation explanatory view of the device showing a process of yarn splicing.

FIG. 13 is an enlarged view of a yarn end showing a yarn splicing operation.

FIG. 14 is a block diagram showing a control system of an embodiment of the present invention.

FIG. 15 is a time chart showing the operation of the yarn splicing device.

[Explanation of symbols]

6 yarn splicing device 7 Thread splicer 15 Air spinning department 70 Hollow guide shaft 77 First nozzle hole 86 Second nozzle hole U spinning unit

Claims (11)

[Claims] 1. An air spinning nozzle for generating a swirling airflow around the tip of a hollow guide shaft having a thread passage formed in the axial direction, and a swirling airflow for generating a swirling airflow in the yarn passage of the hollow guide shaft. A plurality of spinning units provided with auxiliary nozzles and a clamp device that runs along the plurality of spinning units and clamps the upper yarn on the spinning side and the lower yarn on the winding side, and jets compressed air. And a yarn splicing carriage having a pneumatic yarn splicing device for splicing yarn from the spinning unit. 2. An upper thread suction catching means for sucking and grasping a spinning side upper thread and guiding it to the yarn splicing apparatus, and a lower thread suction catching for sucking and grasping a winding side lower thread and guiding it to the yarn splicing apparatus. Means, a first driving means common to the upper thread suction / capturing means and the lower thread suction / capturing means, a second driving means for driving the pneumatic yarn splicing device, and a driving by the first driving means. Based on the second
The spinning device according to claim 1, further comprising a control device common to the first driving device and the second driving device, which starts driving by the driving device. 3. A yarn slack suction means for sucking and absorbing yarn slack when the shutter member is opened and a shutter member is provided on the opening side of the yarn passage, and the above control device is based on the driving of a second drive means. The spinning device according to claim 2, further comprising a drive unit that opens and closes the shutter member via the drive unit. 4. An air pressure detection device for detecting the air pressure of compressed air supplied to the pneumatic yarn splicing device and transmitting the detection result to the control device, and the supply and stop of the supply of compressed air based on the detection result. The switching device according to claim 2 or 3, further comprising a switching valve for switching the above. 5. The pneumatic yarn splicing device is capable of untwisting a yarn end, a yarn splicing hole for splicing compressed air to perform a yarn splicing, and being able to approach and separate from the yarn end. The yarn twist lever, which guides the yarn end to the untwisting nozzle, the yarn splicing hole, the movable blade, the fixed blade, and the clamp plate, and cuts and clamps the yarn end guided by the yarn twisting lever to the untwisting nozzle. The spinning device according to any one of claims 1 to 4, further comprising a clamp cutter that performs the above-mentioned operations substantially at the same time. 6. An air spinning nozzle for generating a swirling airflow around the tip of a hollow guide shaft having a thread passage formed in the axial direction, and a swirling airflow for generating a swirling airflow in the yarn passage of the hollow guide shaft. A pneumatic yarn splicing device provided in a yarn splicing carriage that runs along a plurality of spinning units that are equipped with auxiliary nozzles clamps the yarn end on the spinning side and the yarn end on the winding side, respectively. In the spinning device, after the traveling of the yarn is stopped, the yarn is untwisted by the untwisting nozzle for untwisting both yarn ends, and then compressed air is jetted to the yarn ends in the yarn joining holes to perform the yarn joining. Thread splicing method. 7. An upper thread suction catching means for sucking and grasping a spinning side upper thread and guiding it to the yarn splicing apparatus, and a lower thread suction catching means for sucking and grasping a winding side lower thread and guiding it to the yarn splicing apparatus. 7. The yarn splicing method in a spinning device according to claim 6, wherein the driving of the pneumatic yarn splicing device is started based on the driving by the driving means common to both. 8. The yarn splicing method in a spinning device according to claim 7, wherein absorption of looseness of the yarn is started immediately before clamping of the yarn end on the spinning side based on driving of the pneumatic yarn splicing device. 9. The spinning device according to claim 7, wherein when the air pressure of the compressed air supplied to the untwisting nozzle and the yarn splicing hole falls below a predetermined value, the supply of the compressed air is stopped via the control device. Yarn splicing method. 10. The untwisting nozzle is provided with a yarn pulling lever for guiding the yarn end to the yarn splicing hole, and the yarn pulling lever guides the yarn end to the untwisting nozzle and then cuts the yarn end to cut the yarn. The yarn joining method in a spinning device according to any one of claims 6 to 9, wherein the yarn ends are clamped at substantially the same time, and the yarn end clamps are released immediately after the yarn shifting lever starts to separate from the yarn ends. . 11. The time from the clamp start time in the pneumatic yarn splicing to the winding start after the yarn splicing is 0.90 seconds or less. A yarn joining method in a spinning device.