JPH08246273A - Piecing method and piecing apparatus - Google Patents

Abstract

PURPOSE: To carry out piecing so as to always form a definite piecing up section length by previously loosening a yarn which was already spun before holding and inducing the spun yarn and stabilizing the yarn end position of piecing point. CONSTITUTION: When piecing in a spinning apparatus using an air spinning nozzle, a spun yarn Y wound round a package P is drawn out upward by a suction mouse and loosening is applied to the yarn Y by rotation of a reverse roller 84 and the loosening is sucked and stored into a slack tube 15. In parallel therewith, a suction nozzle 16 is rotated and the yarn is positioned on the upstream side of middle top apron of the draft apparatus 2 and a yarn end (y) is inserted into an air spinning nozzle 3 by air flow of a reversely yarn-feeding nozzle 12 and the nozzle 3 is returned to original position and winding of the package P is reopened and the yarn end (y) is accelerated to a rate equal to or close to spinning rate until the yarn end (y) reaches detection area of a yarn detecting sensor and spinning is reopened and a slide S is drafted and collected so as to warp the yarn Y to carry out piecing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piecing method and a piecing device for a cutting yarn in a spinning device.

[0002]

2. Description of the Related Art Conventionally, in a spinning device using an air spinning nozzle, a sliver is drafted by a drafting device composed of a pair of draft rollers of three lines or more, and then generated by compressed air injection in the air spinning nozzle. The spun yarn is manufactured by twisting with a swirling air current.

In such a spinning device, when a yarn breakage occurs in the spun yarn, or when a yarn defect such as a slab is detected in the spun yarn and the yarn is forcibly cut, the yarn is pulled out from the winding side. The lower yarn and the upper yarn newly spun by the air-spinning nozzle and sent to the downstream side are spliced by a mechanical notter or a splicer. Since these methods splice yarns, there is a limit in improving the composition and appearance of the splice.

Therefore, there has been proposed a method of piecing the yarn in the spinning process and the yarn end on the winding side by restarting the spinning after passing the yarn end on the winding side through the air spinning nozzle. In such a piecing method, when the yarn on the winding side is grasped and guided to the air spinning nozzle, if the moving speed of the guiding means is higher than the rewinding speed of the yarn of the winding package, an excessive tensile force is applied to the yarn. As a result, when the yarn end is guided to the piecing point and then the grip of the yarn is released, the yarn contracts and deviates from the piecing point, or the position of the yarn end becomes unstable, so that the seam length is constant. However, there is a problem in that the strength and the appearance of the seam vary.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a piecing method capable of stably performing piecing with good strength and appearance of seams. It is what

[0006]

[Means for Solving the Problems] After squeezing a spun yarn and guiding it to a yarn splicing position, spinning is started to connect the supplied fiber bundle with the spun yarn at the splicing position. In the method, the spun yarn is pre-loosened before it is grasped and guided. As a device for doing so, a means for grasping the spun yarn and guiding it to the yarn splicing position, a means for preloosing the spun yarn before grasping and guiding the spun yarn, and a means for loosening the yarn Means for sucking and storing the slack. Further, a means for gripping and guiding the spun yarn to a yarn splicing position on a piecing work carriage that moves along the plurality of spinning units, and a device for holding the spun yarn in advance before gripping and guiding the spun yarn. It was provided with a means for keeping it loose and a means for sucking the loosened yarn and storing the looseness.

[0007]

The yarn is loosened in advance before it is grasped and guided by the spun yarn. Therefore, when the yarn is grasped and guided, excessive pulling force is not applied to the yarn and piecing is performed. When the grip of the yarn is released on the point side, the yarn end does not deviate or its position does not deviate, and piecing can always be performed with a constant seam length.

Further, by sucking the slackened yarn and collecting the slack by sucking the surplus yarn, the occurrence of kinking due to the residual torque of the yarn is prevented, and the yarn end position is prevented from shifting due to kinking. It can be prevented.

[0009]

Embodiments will be described with reference to the drawings.

1 and 2 are a front view and a side sectional view showing a spinning machine 1 for carrying out the method of the present invention. In the figure,
The spinning machine 1 includes a large number of spinning units 1u in which a draft device 2, an air spinning nozzle 3, a false twisting device 4, a delivery roller 5, a yarn clearer 6, and a winding device 7 are provided in series from the upstream side to the downstream side. The self-propelled work carriage 8 is reciprocated in the longitudinal direction of the spinning machine 1 along each spinning unit 1u.

The draft device 2 includes a back roller pair 21,
The third roller pair 22, a middle roller pair 23 mounted with an apron belt 23e, and a front roller pair 24 are four-wire draft roller pairs, 25 is a trumpet guide for introducing the sliver S into the back roller pair 21, and 26 is a sliver S. Is a capacitor that regulates the width of. Among the pair of draft rollers, the bottom roller of the pair of front rollers 24 is provided on the line shaft common to each unit and all the units are driven simultaneously, but the other rollers can be stopped for each unit. ing.

Each top roller of the draft device 2 is
Each of them is rotatably supported by the draft cradle 29 and is pressed against each bottom roller by a biasing member (not shown) provided on the draft cradle 29. Among them, the top roller 24t of the front roller pair 24 is
At the time of piecing, it can be lifted and separated from the bottom roller 24b independently of the other rollers by an operation from the work carriage 8 side.

As shown in FIG. 3, the air-spinning nozzle 3 is arranged on the downstream side of the front roller pair 24, and the compressed air injection hole 33 is opened in the tangential direction of the inner surface of the nozzle, and the compressed air injection hole 3 is formed.
Air spinning nozzle 3 by injecting compressed air from 3
A swirling airflow in a direction opposite to the twisting direction of the false twisting device 4 described later can be generated therein. Since the compressed air injection hole 33 is provided so as to be inclined toward the yarn traveling direction, a suction airflow is easily generated in the vicinity of the introduction port 31 of the air spinning nozzle 3.

Reference numeral 34 denotes an air supply pipe for spinning compressed air to the air spinning nozzle 3. The air supply pipe 34 is connected to a pressure source (not shown), and comes from the side of the work carriage 8 stopped at a predetermined position during piecing. By the operation, the supply of compressed air to the air spinning nozzle 3 is stopped.

The air spinning nozzle 3 is fixed to the tip of the swing arm 35 as shown in FIG. 1, and is moved upward from the spinning position by an operation from the work carriage 8 side during piecing. There is.

As shown in FIG. 3, the false twisting device 4 comprises a pair of rollers 4 which are axially crossed with each other and are supported in contact with each other.
It consists of 1,42. Each of the rollers 41 and 42 is a hollow roller formed by externally fitting a thin roller made of a flexible elastic material such as rubber on a roller core body, and has a central portion having an arcuate cross section with respect to both end portions of its peripheral surface. It has an inflated barrel-shaped outer shape. The rollers 41, 42 are attached to the brackets 43, 4
4 is rotatably supported by bearings 4 between the pulleys 45, 46 provided at the ends of the respective rotary shafts and the pulley 49 fixed to the rotary shaft of the motor 50.
7, 48 are wound around and are rotated by the motor 50 synchronously at a constant circumferential speed.

The delivery roller 5 can send the spun yarn Y by pressing the nip roller 51 under pressure by a spring (not shown) during normal spinning.
The nip roller is separated from the delivery roller 5 against the biasing force of the spring by an operation from the work carriage 8 side,
The delivery of spun yarn Y is stopped.

The yarn clearer 6 is a detection device for detecting yarn defects such as slabs, thin yarns, thick yarns, etc., which occur in the spun yarn Y, and yarn breakage. When these are detected, a control signal is output to perform spinning. At the same time, the work carriage 8 is stopped by the spinning unit 1u in order to perform piecing.

The winding device 7 winds the yarn Y on a package P which is rotatably supported by the cradle arm 73 while being traversed by the traverse guide 71 and is pressed against the friction roller 72 to rotate. .

As shown in FIGS. 1 and 2, the work carriage 8 has a plurality of spinning units 1 arranged in parallel along the rails 81 and 82 provided along the entire length of the spinning machine 1.
It is possible to reciprocate between u, and the work carriage 8 sucks and pulls out the spun yarn end wound on the winding package P at the time of piecing, and the suction mouth 9, and the yarn drawn out by the suction mouth 9. A yarn guiding device 10 for guiding the end to the yarn end guiding device 11, a yarn end guiding device 11 for guiding the yarn end to the air spinning nozzle 3, and a yarn reverse feeding nozzle 12, a cutter 13, and a clamp 14 attached to the yarn end guiding device 11. The slack tube 15 for sucking the yarn on the winding side and storing the slack, and the air spinning nozzle 3 by the yarn reverse feeding nozzle 12
A suction nozzle 16 is provided as a yarn end catching unit that sucks and catches the yarn end that has been inserted through and draws it upstream of the front roller 24 (reference roller) of the draft device 2.

The work carriage 8 is brought into contact with a cradle boss 74 which is integral with the cradle arm 73 of the winding device 7,
A grip lever 83 for positioning the cradle arm 73 at an arbitrary deflection angle, a reverse roller 84 for rotating the winding package P in the reverse direction, and a swing arm 85 for pressing the reverse roller 84 to the package P, a package P.
Package pressing plate 86, which presses the roller away from the friction roller 72, and the yarn on the winding side to the traverse guide 71.
And a cam 8 composed of a plurality of pieces for controlling the operation and timing of the thread removing guide 87 which is kept away from the thread removing guide 87.
8 is provided.

As shown in FIG. 4A, the yarn guiding device 10 has
The thread locking arm 101 and the thread guide arm 102 are mainly configured. The thread locking arm 101 has a hook 101a formed at the tip thereof and at the base end thereof,
The bracket 105 fixed to the frame of the work carriage 8 is fixed to the upper end of a vertical shaft 104 that is rotatably supported on the upper surface of the bracket 103. A segment gear 106, which is rotatably supported around a vertical axis, meshes with 103. In addition, the yarn guide arm 102 has V-shaped yarn guide grooves 102a and 102b formed in two plate-shaped portions that are provided in parallel with each other by branching the ends of the yarn guide arm 102. Side thread guide groove 1
Further, a hook 102c is formed at the tip of 02a. The yarn guide arm 102 is fixed at its base end to one end of a horizontal shaft 108 rotatably supported on the front surface of the bracket 103, and the other end of the horizontal shaft 108 is provided with a bevel gear. 109 is provided, and the bevel gear 109 meshes with a bevel gear 107 provided at the lower end of the vertical shaft 104.

At the time of piecing, the rotation of the cam 88 for controlling each operation of the piecing causes the rod 110 to move forward and backward by a predetermined stroke through a lever (not shown).
The thread locking arm 10 is rotated by a counterclockwise rotation and then a reverse rotation by the gear 105 meshing with the segment gear 106.
1 reciprocates about the vertical axis 104 by about 180 °. In parallel with this, the bevel gears 107 and 109 cause the yarn guide arm 102 to move about 18 degrees around the horizontal shaft 108.
It is designed to swing back and forth by 0 °.

The yarn end guiding device 11 is shown in FIGS. 4 (a) and 6 at the tip of an arm 112 which is rotatably supported by a bracket 111 on the upper end of the frame of the work carriage 8 as shown in FIG. A yarn reverse feeding nozzle 12 is provided, and a cutter 13 and a clamp 14 are attached to both sides of the yarn backward feeding nozzle 12. Further, a segment gear 114 is meshed with a gear 113 provided integrally with the rotation shaft of the arm 112, and the segment gear 114 is rotated by a cam 88 that controls each operation of piecing. Guidance device 1
1 is adapted to swing up and down, and at the descending end of the swiveling track, the yarn reverse feeding nozzle 12 is connected to the yarn guiding device 1.
In addition to being located on the side of 0, the yarn reversing nozzle 12 can be located above the yarn path between the air spinning nozzle 3 and the false twisting device 4 at the ascending end of the turning trajectory as shown in FIG. .

As shown in FIG. 4, the yarn reverse feeding nozzle 12 penetrates the nozzle block 121 fixed to the tip of the arm 112 of the yarn end guiding device 11 back and forth to form a yarn guiding hole 122, and also to guide the yarn. As shown in FIG. 6, an air injection hole is opened in the thread hole 122 so as to be inclined with respect to the nozzle axis direction. By injecting compressed air from the air injection hole, the air injection hole shown in FIG. It is possible to generate an air flow from the middle left side to the right side. Further, the yarn reverse feeding nozzle 12 is shown in FIG.
As shown in FIG.
1 is provided with a slit 126 for longitudinally cutting through the slit 126.
Thus, the yarn Y can be inserted into the yarn guide hole 122 from above in FIG. 4 (a). The slit 126 is expanded in a V shape upward in the drawing so that the yarn Y can be easily inserted.

The cutter 13 comprises a fixed blade attached on the front side in FIG. 4 (a) on the delivery side of the yarn reverse feeding nozzle 12, and a movable blade. The movable blade is swung by an air cylinder (not shown). The yarn Y between the fixed blade and the fixed blade can be cut.

The clamp 14 is used for the yarn reverse feeding nozzle 12
4 (a) which is the introduction side of the yarn, that is, the yarn introducing hole 122.
, Which is provided on the opposite side of the cutter 13 from both sides, and is composed of a fixed piece and a movable piece opposed to the fixed piece so that the movable piece is pressed against the fixed piece by an air cylinder (not shown).
The yarn Y can be gripped between them.

The slack tube 15 is shown in FIGS.
As shown in (a), a suction port 151 is opened below the swinging thread locking arm 101 ', and the suction port 151 is
Along the yarn path of the yarn Y between the yarn locking arm 101 'and the winding package P, it is flat in the vertical direction and is arranged with a slight inclination.

Further, the suction port 151 and the suction line in the tube connected to the suction port 151 have a cross-sectional I shape in which the circular holes at the upper and lower ends are communicated with each other by a slit having a width smaller than the diameter of the circular hole. Therefore, the yarn Y sucked into the slack tube 15
Is separated into a U-shape along the upper and lower ends thereof, and it is possible to prevent the occurrence of chatter due to the residual torque of the yarn.

As shown in FIG. 1, the suction nozzle 16 is rotatably supported by a bracket 161 at the upper end of the frame of the work carriage 8 at the base end thereof, and is fixed to the pipe forming the rotating shaft to be integrated. The segment gear 163 meshes with the gear 162 of the
When 3 is rotated by the cam 88 described above, it swings and swings in the vertical direction, and as shown in FIG. 9, the tip side portion 16a thereof can be folded with respect to the base end side portion 16b, and the swing trajectory At the ascending end, the suction port 164 is located on the upstream side of the front top roller 24t, that is, inside the thread guide 30 provided above the tip of the middle top apron 23e.

On the other hand, the base end side of the suction nozzle 16 is rotatably connected to a suction pipe 17 via a joint 169 as shown in FIG. 1, and the other end of the suction pipe 17 is decompressed by a blower (not shown). Is connected to the dust box 20. A yarn detection sensor 18 for detecting the end of the yarn Y passing through the suction pipe 17 is provided near the joint with the suction nozzle 16, and the suction pipe 1 is also provided.
A yarn cutting device 19 for cutting the sucked yarn Y is provided on the duct near the dust box 20 of No. 7.

Next, the piecing process will be described based on the above embodiment. In the piecing process, as a previous step, a preparation process for guiding the yarn end Y on the winding side to the draft device 2 is performed, and then the piecing process for joining the yarn end Y and the sliver S is performed by restarting spinning.

First, when the yarn clearer 6 detects a yarn defect or a yarn breakage (when a yarn defect is detected, the yarn is forcibly cut by a cutter (not shown) provided between the false twisting device 4 and the delivery roller 5). The back roller pair 21, the third roller pair 22, and the middle roller pair 23 of the draft device 2 are stopped by the control signal output from the yarn clearer 6, and the supply of the sliver S is stopped. At this time, since the front roller pair 24 is still driven, the sliver S is torn at the tip of the middle apron 23e, and the yarn between the cut portion and the torn portion is sucked and removed by a duct (not shown). At the same time, the spun yarn Y on the downstream side of the cutting portion is wound around the package P of the winding device 7. During this period, the work carriage 8 is stopped by the spinning unit 1u by another control signal output from the yarn clearer 6.

Then, the work carriage 8 stops the air injection from the air spinning nozzles 3, and the front top roller 2
4t is lifted up from the bottom roller 24b, and the air spinning nozzle 3 itself is lifted up.
Is separated from the delivery roller 5.

Then, the package pressing plate 86 projects from the work carriage 8 based on the operation of the cam 88 and advances between the package P and the suction roller 72, and the package P is separated from the friction roller 72 to stop the winding. After that, the grip lever 83 contacts the cradle boss 74, and positions the cradle arm 73 and the package P supported by the cradle arm 73 at a position separated from the friction roller 72. In this state, the suction mouth 9 rotates to bring its tip close to the package P and suck the yarn end.

At the same time, after the revolving arm 85 revolves to press the reverse roller 84 against the package P, the suction mouth 9 is wound around the package P while the package P is rotated in reverse by the reverse roller 84. The cutting yarn end of Y is sucked and the yarn Y is pulled out as shown in FIG. 4 (a). At this time, the yarn removing guide 87 is placed so that the yarn Y does not project and the yarn Y is not caught by the traverse guide 71.

Subsequently, as shown in FIG. 4A, the thread locking arm 101 and the thread guide arm 102 of the thread guiding device 10 respectively rotate, and the thread Y pulled out by the suction mouth 9 is moved to the position shown in FIG. As shown in (b), it is locked by the hook 101a of the thread locking arm 101 rotated by about 90 °, and the thread Ya of the hook 101a on the suction mouth 9 side.
Is locked by the hook 102c of the thread guide arm 102 that has entered behind it. Further, the thread locking arm 101
4A, the yarn Yb is pulled toward the work carriage 8 side and guided in front of the slack tube 15 as shown by 101 'in FIG.
b is sucked into the slack tube 15, and the yarn Ya on the side of the suction mouth 9 locked by the hook 102c is inserted into the yarn guide grooves 102a, 102 of the yarn guide arm 102.
4b, and as shown in FIG. 4 (a), it is inserted into the yarn reverse feeding nozzle 12 of the yarn end guiding device 11 located at the descending end of the orbit. Next, after the yarn Yb on the winding package P side is gripped by the clamp 14, the cutter 13 is operated to cut the yarn Ya on the suction mouth 9 side and suck and remove it by the suction mouth 9. Then, the arms 101 and 102 return to their original positions.

During this time, the yarn Y of the package P is continuously rewound by the rotation of the reverse roller 84, and the yarn Y is excessively slackened between the clamp 14 and the package P. This slack is sucked and stored by the slack tube 15.

Then, from such a state, the clamp 14 and the yarn reverse-feeding nozzle 12 holding the yarn end Y on the winding side by swinging the yarn end guiding device 11 upward are raised as described above. It moves to the outlet 32 of the air spinning nozzle 3 and guides the yarn end Y to that position. At this time, the yarn Y that has been sucked in advance in the slack tube 15 is pulled out, so that the moving speed of the leading end of the yarn end guiding device 11 (the guiding speed of the yarn end) is increased from the winding package P by the reverse roller 84. Even if it is higher than the rewinding speed, the yarn Y is not stretched excessively between the yarn end guiding device 11 and the package P, and is moderately stretched to the extent that the yarn Y is not warped. Induced promptly.

In parallel with this, the suction nozzle 16 swivels upward, and the tip side portion 16a thereof is extended to form the suction port 164 and the bottom roller 24b as shown in FIG.
The thread guide 30 above the middle top apron 23e upstream of the front top roller 24t which is further lifted off.
It is located inside and suction is started at that part.

When air is jetted from the yarn reverse feeding nozzle 12 from such a state, as shown in FIG. 6, the air from the yarn backward feeding nozzle 12 to the middle apron 23e side through the air spinning nozzle 3 is reached. Flow is generated, followed by clamp 1
When opening 4, the yarn end Y is inserted into the air spinning nozzle 3 along the air flow. At this time, the contraction of the yarn Y and the departure of the yarn Y from the yarn reverse feeding nozzle 12 do not occur, and the yarn Y is reliably inserted into the air spinning nozzle 3. The yarn Y on the winding side inserted through the air spinning nozzle 3 is sucked into the suction nozzle 16, and the further sucked yarn Y is passed through the suction pipe 17 to the dust box 2 as shown in FIG.
Reaches 0. Then, the reverse roller 84 rewinds the yarn Y of a predetermined length and then returns to the original position to stop the rewinding of the yarn Y, and the yarn cutting device 19 causes the suction pipe 17 to move.
The yarn Y is cut inside, and the cut yarn end is the dust box 2.
Recovered within 0.

Next, the air spinning nozzle 3 is lowered and returned to the original spinning position. By this operation, the yarn Y on the winding side is released from the yarn reverse feeding nozzle 12 and is introduced between the pair of rollers 41 and 42 of the false twisting device 4. At the same time, the grip lever 83 is separated from the cradle boss 74, so that the package P is pressed against the friction roller 72, and the package P resumes winding of the yarn Y and is sucked into the suction pipe 17 accordingly. The wound yarn Y is pulled out, and while the yarn end reaches the yarn detection sensor 18, the yarn is accelerated to a normal winding speed.

Then, the yarn detection sensor 18 provided at the end of the suction pipe 17 connected to the suction nozzle 16.
When the passing of the yarn end is detected, a detection signal is issued, whereby the operation of the spinning unit 1u is restarted and the piecing is performed in the following order.

That is, at the same time when the yarn detecting sensor 18 detects the passage of the yarn end, the clutches of the back roller 21, the third roller 22 and the middle roller 23 are closed to restart the draft of the sliver S, and the nip roller 51 is moved to the delivery roller 5. The delivery of the yarn Y is restarted by pressing and immediately after that, the front top roller 24t is connected to the front bottom roller 2
Press contact with 4b. Immediately thereafter, the supply of compressed air to the air spinning nozzle 3 is restarted.

Then, the sliver S stopped at the tip of the middle top apron 23e reaches the suction port 164 of the suction nozzle 16 while the sliver S reaches the front roller pair 24 as shown in FIG. The end Y is guided to the center of the sliver S that is flatly spread by the yarn guide 30, and the tip of the sliver S and the yarn end Y on the winding side are overlapped by a certain length and are fed from the front roller pair 24. Then, the yarn end Y in the superposed state and the sliver S are twisted by the false twist applied to the yarn Y on the winding side by the false twisting device 4, and at this time, the yarn end Y is in the width direction of the sliver S. Since the yarn end Y is located at the center, the yarn end Y is bundled so as to be wrapped by the sliver S, and is spliced to be integrated.

On the other hand, the fibers on both sides of the tip of the sliver S are sucked into the air spinning nozzle 3 in a free state without being converged, and a swirling air flow in the air spinning nozzle 3 in a direction opposite to the false twist is generated. By the action, the spliced portion and the bundle of bundled fibers connected to the spliced portion are used as cores and wound around the cores to form wound fibers.

Furthermore, as a result of the false twist of the above-mentioned bundle of bundled fibers (core fiber bundle) being untwisted through the false twist device 4, the wound fiber is strongly wound around the core fiber bundle, and as a result, the yarn end Y on the winding side is obtained. The sliver S and the sliver S are piecing as one united spun yarn Y, and thereafter, the unit spun yarn Y is continuously spun.

Since the portion pieced through the above-mentioned process is integrated through the essential yarn forming process of the bound spun yarn Y, the spun yarn Y is structurally and apparently integrated with other portions of the spun yarn Y. But there is no change. Further, as described above, since the yarn on the winding side does not shrink and the yarn does not warp, the yarn end and the tip of the sliver S are always piecing with a constant minimum necessary joint length.

In the above-described embodiments, the case where the fiber bundle is the sliver S has been described, but the fiber bundle may be a sliver other than the sliver. The case where the front roller pair 24 of the draft device 2 is used as a reference roller for piecing and the yarn Y on the winding side is pulled out to the upstream side and then spinning is restarted for piecing is shown, but the present invention is not limited to this. , Start the spinning with the yarn end on the winding side positioned on the front roller pair or another draft roller pair, or on the introduction side of the air spinning nozzle or other spinning device or inside, and start piecing It is also possible to carry out in each case, and in these cases, the effect of the present invention becomes more remarkable because the yarn end position directly affects the seam length. Further, in the above-mentioned embodiment, the case where the pair of rollers 41 and 42 is used for the false twisting device 4 is shown, but the false twisting device 4 is of a belt type other than this, a belt and roller,
A disk type or an air nozzle may be used. Further, in the above embodiment, the spinning device is constituted by the air spinning nozzle and the false twisting device, but the spinning device may be constituted only by the air spinning nozzle, or the spinning device is constituted only by the false twisting device. Alternatively, the spinning device may be one that imparts false twist as well as one that imparts actual twist.

[0050]

As described above, the piecing method of the present invention holds the spun yarn and guides it to the yarn splicing position, and then starts spinning to splice the supplied fiber bundle and the spun yarn. In the piecing method in which the yarn is spun at a position, the yarn is loosened in advance before it is grasped and guided by the spun yarn. If it is higher than the unwinding speed), excessive tensile force is not applied to the yarn, the yarn does not contract due to it, the position of the yarn end in the piecing wind is stable, and the seam length is integrated. The strength and appearance of the seam can be piecing stably and
It is possible to shorten the time required for piecing by increasing the moving speed of the yarn end gripping means.

As an apparatus for carrying out the above method, means for gripping and guiding the spun yarn to the yarn splicing position, and loosing the spun yarn before gripping and guiding the spun yarn Since the means and the means for sucking the loosened yarn and storing the looseness are provided, the spun yarn can be easily loosened and the looseness storing means sucks the looseness of the yarn and sucks it. Since tension is applied to the yarn, it is possible to prevent the occurrence of warp, and to stably perform piecing with a constant seam length and good strength and appearance.

Since the yarn slack storage means is provided in the piecing work carriage that moves along a large number of spinning units arranged side by side, it is not necessary to provide yarn slack storage means in each spinning unit, and the spinning machine is not required. The structure of can be simplified.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a spinning machine for carrying out the method of the present invention.

FIG. 2 is a side sectional view showing an example of a spinning machine for carrying out the method of the present invention.

FIG. 3 is a side sectional view of an essential part showing an example of a twisting device of a spinning machine for carrying out the method of the present invention.

FIG. 4 is a perspective view showing a yarn guide device, a yarn end guide device, and a slack tube.

FIG. 5 is a side view showing a yarn end guiding device and a slack tube.

FIG. 6 is a cross-sectional view of essential parts showing a state in which a thread has been inserted through an air spinning nozzle.

FIG. 7 is a side view showing a state where a yarn is sucked by a suction nozzle.

FIG. 8 is a side sectional view of the main part of the spinning machine during piecing.

FIG. 9 is a perspective view of a main part of the spinning machine during piecing.

[Explanation of symbols]

 1 Spinning Machine 2 Drafting Device 3 Air Spinning Nozzle 4 False Twisting Device 5 Delivery Roller 6 Yarn Clearer 7 Winding Device 8 Work Cart 9 Suction Mouse 10 Yarn Guiding Device 11 Yarn End Guidance Device 12 Yarn Reverse Feeding Nozzle 13 Cutter 14 Clamp 15 Slack Tube 16 Suction Nozzle 17 Suction Pipe 18 Thread Detection Sensor 19 Thread Cutting Device 20 Dust Box 24 Front Roller Pair (Reference Roller) 30 Thread Guide S Sliver Y Spun Yarn P Package

Claims (3)

[Claims] 1. A piecing method in which a spun yarn is grasped and guided to a yarn splicing position, and then spinning is started to connect the supplied fiber bundle and the spun yarn at the yarn splicing position. A piecing method, characterized in that the yarn is loosened in advance before it is grasped and guided. 2. A means for gripping a spun yarn to guide it to a yarn splicing position, a means for preloosing the spun yarn before gripping and guiding the spun yarn, and a loosened yarn A piecing device comprising means for sucking and storing the slack. 3. A means for gripping and guiding the spun yarn to a yarn splicing position on a piecing work carriage that moves along a plurality of spinning units, and the yarn before gripping and guiding the spun yarn. A piecing device comprising: a means for loosening the yarn in advance; and a means for sucking the loosened yarn and storing the looseness.