JPH08311732A - Piecing in spinning machine - Google Patents

Abstract

PURPOSE: To provide a method for piecing a yarn in a spinning machine without damaging the already spun yarn, capable of piecing always by stable piecing length and excellent in strength and appearance of piecings. CONSTITUTION: This piecing in a spinning machine is to draw out a spun yarn in the upper stream of the standard roller of a drafting device, then run the spun yarn, drive the drafting device and begin to twist just before or at the same time when an overlapped part of a drafted fiber bundle and the spun yarn passes through a front roller of the drafting device. At this moment, the beginning time for twisting the spun yarn is determined by detecting the passage of the spun yarn end by a yarn detecting sensor set at a predetermined position on a running path of the spun yarn drawn on the upstream of the standard roller of the drafting device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn joining method in a spinning machine.

[0002]

2. Description of the Related Art Conventionally, in a spinning machine, when a yarn breakage occurs in a 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 wound from the winding side. The drawn bobbin thread and the newly spun upper thread were spliced with a mechanical notter, splicer, etc., but these methods improve the composition and appearance of the seam because they are spliced together. There was a limit above.

Therefore, after the spun yarn on the winding side is pulled out to the drafting device through the twisting means, the spinning and winding are restarted so that the fiber bundle and the winding side yarn are in the spinning process. A method of splicing yarn has been proposed. In such a yarn splicing method, if the twisting start time is too early, the spun yarn is further twisted, so that the yarn is damaged, the yarn end position becomes unstable, and the appearance of the seam is damaged, There is a problem that twisting of the yarn ends occurs and a constant seam length cannot be obtained.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of these points of the prior art, and without damaging the spun yarn,
Further, it is an object of the present invention to provide a yarn splicing method for a spinning machine, which is capable of always splicing a yarn with a stable seam length and having good strength and appearance.

[0005]

[Means for Solving the Problems] After drawing a spun yarn by a predetermined length to the upstream side of a reference roller of a drafting device, the spun yarn is made to run and the drafting device is driven to obtain a drafted fiber bundle. In a yarn joining method in a spinning machine for superimposing a spun yarn at the above-mentioned reference roller position, spinning is performed at the same time as a superposed portion of the spun yarn and the fiber bundle passes through the front roller position of the draft device, or immediately before that. Start twisting on the finished yarn. At this time, a yarn detection sensor provided at a predetermined position on the traveling path of the spun yarn drawn on the upstream side of the reference roller of the draft device detects passage of the end of the spun yarn to detect spun yarn. Determine the start time of twisting. Further, the twisting means is composed of a pair of nip members arranged so as to intersect each other in the traveling direction, and when guiding the spun yarn to the upstream side of the twisting means, the yarn guide member is advanced, The spun yarn is removed from the opposing portions of the pair of nip members, and the yarn is spun on the fiber bundle at the same time or immediately before the yarn passes through the front roller position of the draft device. The guide member is withdrawn and the spun yarn is introduced into the opposing portions of the pair of nip members, and twisting of the spun yarn is started.

[0006]

Function: The already twisted spun yarn is not retwisted, and the retwisting does not damage the yarn or destabilize the yarn end position. Then, when the yarn detection sensor detects the passage of the spun yarn end at that position, or after a certain period of time after the detection, the supply of the fiber bundle is started, and after the passage of the spun yarn end is detected, When twisting of the spun yarn is started at a predetermined timing when the yarn end and the tip of the fiber bundle reach the front roller, the spun yarn and the fiber bundle have a fixed joint length at the front roller position. It is spliced.

[0007]

Embodiments will be described with reference to the drawings.

1 and 2 are a side sectional view and a perspective view of an essential part showing a spinning machine 1 for carrying out the method of the present invention. In the figure, a spinning machine 1 includes a draft device 2, an air spinning nozzle 3,
A plurality of spinning units 1u in which a false twisting device (twisting means) 4, a delivery roller 5, a yarn clearer 6, and a winding device 7 are provided in series from the upstream side toward the downstream side are arranged in parallel, and each spinning unit 1u is arranged. It is equipped with a self-propelled work carriage 8 that reciprocates in the machine longitudinal direction of the spinning machine 1.

The draft device 2 includes a pair of back rollers 21,
The third roller pair 22, a middle roller pair 23 having an apron belt 23e mounted thereon, and a front roller pair 24 are four pairs of draft roller pairs. Of the draft roller pairs, the front roller pair 24 includes the bottom roller 24b of each unit. It is provided on a line shaft common to 1 u and is driven simultaneously by all the units, but the other rollers can be stopped for each unit. Further, the top roller 24t of the front roller pair 24 can be lifted and separated from the bottom roller 24b independently of the other rollers.

As shown in FIG. 2, the air spinning nozzle 3 is arranged on the downstream side of the front roller pair 24 in the yarn traveling direction, and the compressed yarn is jetted in the nozzle to oppose the twisting direction of a false twisting device 4 described later. It is possible to generate swirling airflow in any direction.
The air spinning nozzle 3 is driven by a mechanism (not shown).
At the time of yarn splicing, the yarn moves out of the spinning position and moves upward.

The false twisting device 4 has a pair of rollers (nip members) 4 which are supported in contact with each other by intersecting the axial directions.
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 and 42 are connected to the rotary shafts 41a and 4a, respectively.
Pulleys 41p and 42p and a motor 45 provided at the end of 2a
Belts 43 and 44 are respectively wound around the pulley 45p fixed to the rotating shaft of the motor and are rotated by the motor 45 in synchronism with each other.

A yarn guide member 46 is provided on the downstream side of the false twisting device 4 in the yarn traveling direction so as to be able to move forward and backward with respect to the yarn traveling locus during normal spinning. The yarn guide member 46 is plate-shaped and has a V-shaped yarn guide groove 46a at the center of its upper edge.
Is formed. The thread guide member 46 is fixed to the tip of the piston rod 48 of the air cylinder 47, and can be moved up and down by the operation of the air cylinder 47. To operate the air cylinder 47, a valve 49 provided on the compressed air supply pipe is operated by a lever D on the work carriage 8 side.
This is performed by rotating the lever L on the unit side.
Further, the advance / retreat direction of the yarn guide member 46 corresponds to the configuration of the false twisting device 4. That is, the pair of rollers 41 and 42 of the false twisting device 4 are arranged on the left and right sides of the yarn path,
The facing portions are in contact with each other in a virtual vertical plane including the yarn path, and the yarn guide groove 46a is adapted to move up and down in the virtual vertical plane. As a result, the thread guide groove 46
While guiding the yarn Y with a, the yarn Y is fed to the rollers 41, 42.
Can be inserted into the facing contact portions of the rollers 41 and 42 along the tangential direction of the yarn, and the yarn Y does not come into contact with either one of the rollers first during the inserting process.

The work carriage 8 can reciprocate between a plurality of spinning units 1u of the spinning machines 1 arranged in parallel along a rail provided over the entire length of the machine stand of the spinning machine 1. In FIG. 8, a suction mouth 81 for sucking and pulling out the spun yarn end wound in the winding package P at the time of piecing is held, and the yarn end pulled out by the suction mouth 81 is grasped and guided to the air spinning nozzle 3. The yarn end guide device 82, the yarn reverse feed nozzle 83 attached thereto, and the yarn end inserted through the air spinning nozzle 3 by the yarn reverse feed nozzle 83 is sucked and captured to the upstream side of the front roller 24 (reference roller) of the draft device 2. A suction nozzle 84 that draws out to the inside is provided.

The suction nozzle 84 is rotatably supported on the upper end of the frame of the work carriage 8 at its base end and can swing and swing in the vertical direction, and its tip end side portion 84a has its base end side portion 84b. It is foldable with respect to the sliver S, and when swiveled upward, the suction port is located upstream of the front top roller 24t, that is, above the tip of the middle top apron 23e, and the yarn Y is located in the central portion in the width direction of the sliver S. It is located inside the thread guide 85 that guides to the. Further, the base end side of the suction nozzle 84 is rotatably connected to a suction pipe 86, and the other end of the suction pipe 17 is connected to a dust box 87 whose pressure is reduced by a blower (not shown).
Then, the suction nozzle 84 of the suction pipe 86
The end of the yarn Y passing therethrough is detected in the vicinity of the joint portion with, and the spinning start timing of the spinning unit 1u, specifically, the draft start timing, the nip roller 51 press contact timing, and the front top roller 24 press contact timing. , And the start time of twisting by descending the yarn guide member 46, the air spinning nozzle 3
A yarn detection sensor 88 for determining the compressed air injection timing and the like is provided.

In the yarn detecting sensor 88, the distance from the front roller 24, which is the reference roller of the draft device 2, to the yarn detecting sensor 88 via the suction nozzle 84 located upstream of the front roller 24 is a predetermined distance described below. It is provided in the position. That is, after the start of spinning, the spinning speed (the yarn delivery speed of the delivery roller 5) at a known time when the tip of the sliver S reaches the front roller 24.
It is provided on the upstream side of the front roller 24 with a predetermined distance added to the traveling distance of the yarn Y traveling at a constant speed and the length of the seam to be obtained. The distance between the front roller 24 and the yarn detection sensor 88 is not limited to the above distance as long as it is longer than the above distance.

The yarn detection sensor 88 uses, for example, a photoelectric proximity sensor to face the inner peripheral side of the bent portion of the suction pipe 86 having a constant yarn path in order to reliably detect the yarn Y. In the illustrated example, a transparent pipe is used as the suction pipe 86 at least in the portion where the yarn detection sensor 88 is provided. Further, a yarn cutting device 89 that cuts the sucked yarn Y at that position is provided on the pipe line of the suction pipe 86 near the dust box 87. The yarn cutting device 89, after starting winding,
The yarn Y is arranged on the upstream side of the yarn detecting sensor 88 with a predetermined distance corresponding to the traveling distance while the yarn Y is accelerated to (or near) the normal spinning speed.

Next, the yarn joining process will be described based on the above-mentioned embodiment.

First, when the yarn clearer 6 detects a yarn defect or a yarn breakage (in the case of the yarn defect detection, the yarn is cut by a cutter (not shown) provided between the false twisting device 4 and the delivery roller 5), the draft. The back roller pair 21, the third roller pair 22, and the middle roller pair 23 of the device 2 are stopped, 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.

At the same time, the work carriage 8 is stopped at the spinning unit 1u, the air injection at the air spinning nozzle 3 is stopped by the operation from the side of the work carriage 8 and the air spinning nozzle 3 itself is lifted. To be done. Further, the front top roller 24t is lifted up and separated from the bottom roller 24b, and at the same time, the air cylinder 47 is operated to raise the yarn guide member 46. Further, the nip roller 51 is lifted up above the delivery roller 5.

Next, after the package P is separated from the friction roller 72 and the winding is stopped, the suction mouth 81 is positioned on the package P to suck and grip the yarn end, and further, the reverse roller (not shown) fixes the package P on the package P. While rewinding the wound yarn Y, suction mouse 8
1 pulls out the cut yarn end of the spun yarn Y wound up in the package P upward. Next, the yarn end guiding device 82 pivots upward while holding the yarn Y, and guides the yarn end Y through the false twisting device 4 to the delivery port of the air spinning nozzle 3 which is lifted. . At this time, the false twisting device 4 is driven, but the yarn Y
Is removed upward from the nip point of the false twisting device 4 by being supported and guided by the yarn guide member 46 that has advanced to the yarn path, and the yarn Y is additionally twisted or damaged by contact with the rollers 41 and 42. It will not be done.

Then, the yarn reverse feeding nozzle 83 at the tip of the yarn end guiding device 82 generates an air flow in the direction opposite to the yarn traveling direction during normal spinning, which reaches the middle apron 23e side through the air spinning nozzle 3. The yarn Y is inserted into the air spinning nozzle 3 along the air flow. The yarn Y on the take-up side inserted through the air spinning nozzle 3 precedes the suction nozzle located in the yarn guide 85 upstream of the front top roller 24t which is lifted up and separated, and above the middle apron 23e. The yarn Y sucked from the suction port of 84 and further sucked
Reaches the dust box 87 through the suction pipe 86. Then, after rewinding the yarn Y of a predetermined length, the rewinding of the yarn Y is stopped, the yarn cutting device 89 cuts the yarn Y in the suction pipe 86, and the cut yarn end is collected in the dust box 87. To be done.

Next, the air spinning nozzle 3 is lowered to return to the original spinning position, and this operation causes the yarn Y on the winding side to pass through a slit (not shown) provided in the yarn reverse feeding nozzle 83.
While the yarn Y is removed from the yarn reverse feeding nozzle 83 and the winding of the yarn Y is restarted, the yarn Y sucked into the suction pipe 86 is pulled out, and while the yarn end reaches the yarn detection sensor 88, The winding speed, that is, the spinning speed, or a speed close thereto (70% or more) is accelerated.

When the yarn detection sensor 88 detects the passage of the yarn end, a detection signal is issued, whereby the operation of the spinning unit 1u is restarted and the yarn splicing is performed in the following order. That is, the yarn detection sensor 88 detects the passage of the yarn end, and simultaneously presses the nip roller 51 against the delivery roller 5. By the pressure contact of the nip roller 51, the traveling speed of the yarn Y on the winding side becomes the delivery speed of the delivery roller 5, that is, the normal spinning speed. Therefore, thereafter, the end of the yarn Y on the winding side is detected by the yarn detection sensor 88, and then the front roller pair 2 described above is detected.
4 to reach the front roller pair 24 at a predetermined distance from the yarn detection sensor 18 and at a predetermined timing determined only by the speed of the yarn Y. At the same time when the yarn end passage is detected, a timer (not shown) (delay circuit or the like) is operating, and the front top roller 2 is moved at the predetermined timing.
4t is pressed against the front bottom roller 24b,
The air cylinder 48 is operated to move the yarn guide member 46 downward, and this action causes the yarn Y to rotate the yarns 41, 4 of the false twisting device 4.
The false twist of the yarn Y is started by inserting the yarn Y into the facing contact portion 2. Then, the back roller 21, the third roller 22, and the middle roller 23 are driven to restart the draft of the sliver S, and then compressed air is supplied to the air spinning nozzle 3.

The sliver S stopped at the tip of the middle top apron 23e due to the restart of the draft reaches the front roller pair 24, and the winding side yarn end Y reaching the suction port of the suction nozzle 84 has the suction port and the yarn. The sliver S is flattened by the guide 85 and guided to the center of the sliver S. The tip of the sliver S and the yarn end Y on the winding side are delivered from the front roller pair 24 in a state of being overlapped by a certain length, and the false twisting device 4 The yarn end Y in the superposed state and the sliver S are twisted by false twist imparted to the yarn Y on the winding side. At this time, the yarn end Y is located at the center of the sliver S in the width direction. The sliver S wraps Y so that it is bundled and spliced into a unit.

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 the swirling air flow in the air spinning nozzle 3 in the 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. Further, as a result of the false twisting of the bundled fiber bundle (core fiber bundle) being untwisted through the false twisting device 4, the wound fiber is strongly wound around the core fiber bundle,
The yarn end Y on the winding side and the sliver S are spliced as one bundled spun yarn Y, and thereafter, the spun bundled yarn Y is continuously spun.

Since the portion spliced 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 externally integrated with other parts of the spun yarn Y. There is no change on the top either. Further, the twisting of the yarn Y on the winding side and the sliver S, which have already been spun, is started at the same time as or just before reaching the front roller pair 24. No additional twisting occurs, and the additional twisting does not change the yarn end position and shorten the seam length or cause instability.

The yarn Y is fed to the rollers 41 and 42 of the false twisting device 4.
If the compressed air is jetted from the air spinning nozzle 3 before the insertion, the yarn Y enters the false twisting device 4 by the air flow blown from the outlet of the air spinning nozzle 3 onto the surface of the false twisting device 4. It will be difficult. In addition, the yarn Y is applied to the rollers 41 of the false twisting device 4,
The yarn Y on the winding side is inserted into the front roller pair 2 when it is inserted between
If not nipped at 4, the yarn end position is displaced due to twisting. Therefore, the timing of inserting the yarn Y into the false twisting device 4 (twisting start timing) must be at least at the same time as or after the pressure contact of the front roller, and before the pneumatic supply to the air spinning nozzle 3. In the above embodiment, the twisting is started at the same time as the pressure contact of the front roller, thereby simplifying the control system for them.

In the above embodiment, the yarn guide member 46 is provided and the yarn Y is inserted into the false twisting device 4 by lowering the yarn guide member 46. However, the yarn guide member 46 is not provided. In addition, the yarn Y may be inserted into the false twisting device 4 by the operation of lowering the raised air spinning nozzle 3 to the normal spinning position.

Further, in the above-described embodiment, the front roller pair 24 of the draft device 2 is used as a reference roller for yarn splicing, and the upstream back roller pair 21, the third roller pair 22, and the middle roller pair 23 are stopped. However, it is also possible to stop driving only the back roller pair 21 or the back roller pair 21 and the third roller pair 22. In that case, the sliver S is drafted and the tip thereof is used as a reference. Front roller pair 24 which is a roller
It is necessary to advance their drive start timing by an amount corresponding to the time to reach. In this case, it takes a long time until the sliver tip reaches the front roller position after the draft is restarted. Therefore, in some cases, the twisting start timing may be delayed from the draft start timing. The reference roller may be the middle roller pair 23 or the third roller pair 22,
In that case, a separating mechanism similar to the front roller pair 24 is also provided for them.

In the above embodiment, the pair of rollers 41 and 42 is used for the false twisting device (false twisting device) 4. However, the false twisting device 4 may be of a belt type or a belt other than this. A roller type, a disc type, or an air nozzle may be used. Further, in the above embodiment, the spinning device is configured by the air spinning nozzle and the false twisting device, but the spinning device may be configured by only the air spinning nozzle, or the spinning device may be configured by only the false twisting device. Alternatively, the spinning device may be one that imparts false twist as well as one that imparts actual twist. Further, although the fiber bundle is the sliver S in the above embodiment, the fiber bundle may be a sliver other than the sliver.

[0031]

As described above, the yarn joining method in the spinning machine of the present invention draws the spun yarn to the upstream side of the reference roller of the draft device by a predetermined length, and then runs the spun yarn and the draft device. In the yarn splicing method of driving the drafted fiber bundle and the spun yarn at the reference roller position, the overlapped portion of the spun yarn and the fiber bundle simultaneously passes through the front roller position of the draft device. Or, just before that, the twisting of the spun yarn is started, so that the spun yarn that has already been twisted before the splicing is not re-twisted. Not only is it possible to prevent the yarn from being damaged or fluffing occurring, but also to prevent the yarn end position from becoming unstable, and with a constant seam length,
It is possible to perform yarn splicing with good seam strength and appearance.

Further, in the above yarn joining method, passage of the end of the spun yarn is detected by a yarn detection sensor provided at a predetermined position on the traveling path of the spun yarn drawn on the upstream side of the reference roller of the draft device. By doing so, the twisting start timing for the spun yarn is determined, so that the twisting can be started easily and surely at an appropriate timing, and the devices for performing the yarn splicing can be easily synchronized. The control can be facilitated.

The twisting means is composed of a pair of nip members arranged so as to face each other so as to cross the traveling direction, and when the spun yarn is guided to the upstream side of the twisting means, the yarn guide member is used. By advancing, the spun yarn is removed from the opposing portions of the pair of nip members, and the overlapping portion of the spun yarn and the fiber bundle passes through the front roller position of the draft device, or at the same time. Immediately before, the yarn guide member is withdrawn to introduce the spun yarn into the facing portion of the pair of nip members, and twisting of the spun yarn is started, so that the spun yarn is spun by the nip member. It is possible to prevent the yarn from being damaged or being additionally twisted, and it is possible to start twisting of the spun yarn at an appropriate timing with easy and reliable operation.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a twisted portion of a spinning machine for carrying out the method of the present invention.

[Explanation of symbols]

 1 spinning machine 2 draft device 3 air spinning nozzle 4 false twisting device (twisting means) 5 delivery roller 6 yarn clearer 7 winding device 8 work carriage 24 front roller pair (reference roller) 41, 42 nip member 46 yarn guide member 47 air Cylinder 51 Nip roller 84 Suction nozzle 85 Thread guide 86 Suction pipe 88 Thread detection sensor 89 Thread cutting device S Sliver (fiber bundle) Y Spun yarn P package

Claims (3)

[Claims] 1. A drawn fiber bundle and a spun yarn are driven by running the spun yarn after pulling the spun yarn a predetermined length upstream of a reference roller of a draft device and driving the draft device. In a yarn joining method in a spinning machine in which and are polymerized at the reference roller position, at the same time as the overlapping portion of the spun yarn and the fiber bundle passes the front roller position of the draft device, or immediately before that, the spun yarn is spun. A yarn joining method in a spinning machine, which comprises starting twisting of the yarn. 2. A spun yarn by detecting the passage of the end of the spun yarn by a yarn detection sensor provided at a predetermined position on the traveling path of the spun yarn drawn on the upstream side of the reference roller of the draft device. The yarn splicing method for a spinning machine according to claim 1, wherein a twisting start time to the yarn is determined. 3. The twisting means comprises a pair of nip members arranged so as to face each other so as to intersect with each other in the traveling direction, and when the spun yarn is guided to the upstream side of the twisting means, the yarn guide member is advanced. Then, the spun yarn is removed from the facing portions of the pair of nip members, and the overlapping portion of the spun yarn and the fiber bundle passes through the front roller position of the draft device, or immediately before that. 3. The yarn guide member is withdrawn to introduce the spun yarn into the opposing portions of the pair of nip members, and twisting of the spun yarn is started. Yarn splicing method for spinning machines.