JPH048357B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a yarn splicing method in an automatic winder.

[Conventional technology]

Yarn splicing in automatic winders is done mechanically using Fishermannotter, Wiversenotter,
Alternatively, there are known fluid type yarn splicing devices that splice yarn by the action of compressed fluid, and in any of these devices, the yarn is placed in the yarn path of the winding unit, and the yarn wound during normal rewinding is transferred to the yarn feeding bobbin. The thread is pulled out from the thread, passes above the thread splicing device while being checked by a detection device, and is wound into a package by a rotationally driven traversing drum. At this time, if the detection device installed in the yarn path detects yarn breakage or yarn defects such as slubs, a yarn splicing command is immediately issued in the case of yarn breakage, and the yarn splicing device will splice the yarn. In the case of slab detection, after the yarn is cut by the cutter, a yarn splicing command is issued, and the yarn splicing is performed according to the yarn splicing command.

The first type of yarn splicing device in which each winding unit is provided with the yarn splicing device is shown below. That is, the yarn Y1 pulled out from the yarn supply bobbin B passes through a detection device 8 that detects yarn defects such as slabs, and is wound around a package P rotating by a traverse drum 9.

In such a device, when piecing yarns, the 12th
As shown in the figure, the thread is pulled out from the package P side.
YP is guided to the yarn splicing member 101 while being sucked and held by the suction mouth 11, and the yarn YB on the bobbin B side is held by the relay pipe 10 and guided to the yarn splicing member 101. Next, the thread splicing member 10
The yarn YP2 connected to the suction mouth 11 and the yarn YB2 connected to the relay pipe 10 are cut by cutters 106 and 107 on both the upper and lower sides of 1, and the tip end portions of the yarns are overlapped in the yarn splicing hole 37 of the yarn splicing member 101. The yarn is spliced by the action of compressed fluid.

[Problem that the invention seeks to solve]

In the yarn splicing device as described above, the relay pipe 1
0 rotates to the yarn end suction position 10a on the yarn feeding bobbin B side, and after suctioning the yarn end on the bobbin side, rotates again to the original position to guide the bobbin side yarn YB to a predetermined position of the yarn splicing device. do. In this case, the relay pipe 10 is designed to suction and hold the yarn end by the action of the suction air current, so for example, when pulling out the yarn from the bobbin, some damage may occur in the core tube of the bobbin, and the yarn may get caught in the relay pipe. The thread may be pulled out from the pipe in the opposite direction, or when the thread is pulled out from a bobbin with low resistance, a longer thread than necessary is sucked, resulting in a large amount of waste thread, or even inside the relay pipe. If the thread end suction length is insufficient, when the thread is pushed in by a lever etc. during thread splicing operation,
The thread end slips out of the relay pipe and the thread is not cut at a predetermined position.As a result, a so-called three-knot knot occurs in which the bobbin side thread end protrudes from the seam for a long time after thread splicing, and if it continues to be caught in the package cage, it will result in a defective package. This can cause trouble in the weaving process, etc.

The present invention provides a yarn splicing method that can solve the various problems mentioned above all at once.

[Means for solving problems]

The present invention provides an automatic winder that is equipped with a clamp member that clamps the suctioned yarn end at the tip opening of a relay pipe that suctions the yarn end of the yarn supply bobbin and guides it to the yarn splicing member. After clamping, the above-mentioned clamp member is opened only when suctioning and discharging cut thread waste until the end of one cycle of yarn splicing operation, and the above-mentioned clamp member is opened during other yarn splicing operations and at least when the drum is started after yarn splicing. The member is kept in a closed state, and if there is a thread cutting error, the continuous thread between the yarn feeding bobbin and the relay pipe is forcibly cut by the thread running, this is considered a thread splicing mistake, and the thread splicing operation is restarted again. This is what I did.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic diagram of an automatic winder to which the present invention is applied, in which each side frame 1
A shaft or pipe 2 and a suction pipe 3 are installed between them, and a winding unit 4 is connected to the shaft 2.
While the automatic winder is in operation, the unit 4 is also placed on the pipe 3 and fixed as appropriate. Incidentally, the pipe 3 is connected to a blower (not shown), and a suction air current is constantly applied to the pipe 3.

To rewind the yarn from the bobbin B to the package P in the winding unit 4, the yarn Y1 from the bobbin B on the peg 5 passes through the guide 6, applies appropriate tension to the yarn with the tensor 7, and detects yarn unevenness such as slabs. The yarn passes through a detection device 8 that also performs cutting and yarn travel detection, and is wound onto a package P rotated by a traversing drum 9.

At this time, when the detection device 8 detects yarn unevenness in the yarn, a cutter installed near the detection device 8 is activated to cut the traveling yarn Y1 and winding is stopped, while the relay pipe 10 is activated. thread on bobbin B side
The suction mouse 11 guides the yarn YP on the package P side to the yarn splicing device 12 installed at a position away from the normal yarn travel path Y1, and the yarn splicing device 1
After splicing in step 2, rewinding of the yarn continues. Note that the relay pipe 10 and suction mouth 11 are connected to a pipe 3 that produces suction airflow. In addition, since fluid such as compressed air is used in the yarn splicing device, a conduit 14 is connected between the pipe 13 and the yarn splicing box 15 in a separate route, and the pipe 1
Compressed fluid is supplied from 3.

Detailed views of the entire yarn splicing device 12 described above are shown in FIGS. 2 and 3. That is, during normal rewinding, the thread Y passes from the bobbin B through the detection device 8, the fixed guide 16 installed at one end of the detection device 8, and the rotating guides 17 and 18 installed on both sides of the detection device 8. A route is taken to reach the package P by passing above the yarn splicing device 12.

The yarn splicing device 12 basically consists of a yarn splicing member 101
Yarn holding device 102, untwisting nozzles 103, 10
4, thread shifting lever 105, thread cutting device 106,1
07 and yarn support devices 108, 109, the suction ports at the tips of the relay pipe 10 and the suction mouth 11 pivot above the yarn splicing device 12 so as to intersect with each other, and are connected to the bobbin B side and the package P side. The yarn ends YB and YP are sucked and moved to the outside of the yarn splicing device 12 and stopped.

In addition, the above-mentioned relay pipe 10 and suction mouth 1
The operations No. 1 are not performed at the same time, but are performed with some time lag. That is, first, the yarn end YP on the package P side is pivoted to the outside of the yarn splicing device 12 by the suction mouth 11 and stopped, and almost at the same time the pivot lever 20 of the yarn support device 109 on the package P side is rotated as shown in the figure. As shown in the fourth diagram, the control cam moves counterclockwise to the chain line position 20-1.
It rotates until it hits the support block 21, which is fixed in place, and stops. At this time, the thread Y moves while being hung on the hook portion 20a of the swing lever 20, and is held between the support block 21 and the swing lever 20.

On the other hand, while the pivot lever 20 is operating, the thread Y located on the fixed guide 16 and the pivot guides 17, 18 is guided into the guide groove along the slopes 16a, 17a, 18a of the guides 16, 17, 18. A detection device 8 inserted into the guide groove 19 and installed at the same position as the guide groove 19 confirms the presence or absence of the yarn Y, and detects whether two or more yarn ends YP are accidentally suctioned by the suction mouth 11. After checking the thread Y, the rotating guides 17 and 18
is rotated counterclockwise around the spindle 22 as shown in the fifth figure by a control cam (not shown), and the yarn end is
YP is removed from the detection device 8 and the rotating guide 17,
18 into the escape grooves 17b and 18b. Furthermore,
Almost simultaneously with the turning of the turning guides 17 and 18, the yarn end YB on the bobbin B side is sucked by the relay pipe 10, turns in the opposite direction to the suction mouth 11, and moves to the outside of the yarn splicing device 12. Stop. Almost simultaneously with the stop of the rotation of the relay pipe 10, the support plate 23a of the yarn support device 108 moves along the guide plate 24 in the same direction as the rotation lever 20 by a control cam (not shown) while supporting the yarn Y. , the yarn Y is moved between the support plate 23a and the support block 2 by contacting the support block 23b which is fixed at a fixed position.
3b. At this time, the thread YB is hung on the hook portions 17c, 18c near the tips of the guides by the rotation of the rotating guides 17, 18, as shown in FIG.
The check by the detection device 8 is performed after the yarn splicing is completed.

A yarn splicing member 10 is located approximately in the center of the yarn splicing device 12.
1 is installed, and thread guide pins 25, 26 and a thread presser 10 are installed on both sides of the thread splicing member 101.
2. Untwisting nozzles 103, 104 and yarn guide 2
7, 28, and further thread cutting devices 106, 107 and fork guides 29, 30 are arranged in this order, and on the side of the thread splicing member 101 there is a spindle 31 and levers 32, 33 that pivot around the spindle 31 as a fulcrum. A thread shifting lever 105 consisting of is installed. The yarn shifting lever 105 is operated by a detection device 8 that detects a slab of yarn Y and cuts it with a cutting device (not shown), and connects the relay pipe 1
0, the suction mouse 11 operates and the ends of each other's threads are
After guiding YP and YB to the outside of the yarn splicing device 12, the yarn ends YP and YB are guided in the direction of the yarn splicing device 12. The rotation range of the thread shifting lever 105 comes into contact with a stopper 34 which is installed between the fork guide 29 and the thread supporting member 108 and has a substantially V-shaped cross section. Therefore, by adjusting the position of the stopper 34, the rotation range of the thread shifting lever 108 can also be adjusted.

Furthermore, in FIGS. 2, 3, and 7, a part of the fixed guide 16 is used as a clamping surface 16c for the package side thread, and the clamping surface 16c and the thread gripping surface 110c of the clamp lever 110 A clamp fixing device 112 for miscut threads on the package side is constructed. That is, the clamp lever 110 is rotatably supported around the shaft 31,
It is biased clockwise in FIG. 3 by a spring 113 wound around the shaft 31. A pin 114 is fixed to the middle part of the clamp lever 110, and engages with the side surface 18c of the pivoting guide 18.
follows the movement of Note that the above-mentioned clamping mechanism is just one example, and any mechanism that can clamp any position between the suction mouth 11 and the yarn splicing member 101 in FIG. 2 may be used. Preferably, it is as close to the thread splicing member 101 as possible. That is, in FIG. 16, when the drum rotates while the yarn between the yarn splicing member 101 and the suction mouth 11 is clamped, the yarn is forcibly cut;
This is because it is necessary that the cutting point be a regular thread portion between the package P and the thread splicing member 101 in order to prevent double thread from being caught.

Next, the configuration and operation of the relay pipe 10 will be explained.

FIG. 8 shows a stopper mechanism 72 for the relay pipe 10.
9 shows the drive mechanism 73 of the relay pipe 10, and FIG. 10 shows the clamp mechanism 74. In FIG. 9, the relay pipe 10
rotates forward and backward around the rotating hollow shaft 75 due to the meshing of the gear 76 and the sector gear 77. The fan-shaped gear 77 rotates around the fixed shaft 78 by the action of the cam plate 79 and the cam follower 80. 81 is a spring that presses the cam follower 80 provided in the middle of the fan-shaped gear 77 against the cam plate 79. Therefore,
The cam plate 79 rotates in the direction of arrow 82 from the illustrated standby position, and when the maximum diameter portion 83 comes into contact with the cam follower 80, the relay pipe 10 turns to the lowest position and sucks the yarn end on the bobbin side. Cam surfaces 83, 84, and 85 of the cam plate 79 allow the relay pipe 10 to suction and grip the yarn end on the bobbin side, return slightly, and perform the suction operation again.

As shown in FIG. 10, the clamping member for the relay pipe has a block 87 having a hole 86 communicating with the pipe fixed to the open end of the pipe 10 with a screw 88.
A clamp plate 90 that moves toward and away from the end surface 89 of the block 87 is pivotally supported by a pin 91. Furthermore, a cover 92 that opens and closes integrally with the clamp plate 90
When the rear end surface 93 of the cover 92 comes into contact with a stop plate 94, which will be described later, the cover 92 opens against a spring 95.

In FIG. 8, a stopper 96 is provided for regulating the upper end position of the relay pipe 10, that is, the standby position. The stopper 96 is fixed on a cam lever 98 supported by a fixed shaft 97, and a cam follower 99 on the cam lever 98 is in contact with a cam plate 100, so that the stopper 96 temporarily moves against the shaft 97 by following the cam plate 100. The relay pipe 10 follows the stopper 96 and rotates clockwise around the shaft 75 at a certain angle. At this time, the cover 92 of the clamp member engages with the stopper 94, so that the cover 92 is opened and the clamp plate 90 is controlled to be temporarily opened. The cam plate 100 described above can be provided exclusively for the relay pipe, but in reality, the winding unit is equipped with many types of cams and levers, and installing a new cam requires modification and is difficult. be.

Therefore, in this embodiment, the cam plate 100 that controls the timing of supplying compressed fluid into the yarn splicing hole of the yarn splicing device is used for controlling the stopper 96. Therefore, the timing of opening the clamp plate at the upper end of the relay pipe 10 is the moment when the yarn splicing blast occurs, that is, the moment when two yarns are actually spliced.

Theoretically, the opening timing at the upper end of the clamp plate is such that, of the two yarn ends to be spliced, the yarn connected to the relay pipe 10 and the bobbin is introduced into the yarn splicing member 101, and the upper end of FIG. It suffices to do this as long as it is after the cutter 107 operates and until the drum starts after the yarn splicing operation. That is, after cutting with the cutter 107, it is only necessary to suction and discharge the hanging thread waste held by the clamp plate 90 of the relay pipe 10 into the relay pipe, and at least when the drum is started, the clamp plate 90 is closed again. It is necessary to be in the state.

Next, regarding the operation of the above device, the timing chart in FIG. 14, FIGS. 1 to 6, and 11 to 1
This will be explained in FIG.

In FIG. 1, when a detection device 8 detects thread breakage during rewinding or the disappearance of the thread layer on the bobbin and detects that the thread is not running, the drum 9 stops, while a one-turn clutch (not shown) detects that the thread is not running. The yarn splicing operation is performed by various control cams installed on a shaft rotated via the clutch or various control cams interlocked with the shaft.

First, relay pipe 10, suction mouth 11
rotates from the chain line positions 10a and 11a shown in the first figure while sucking the yarn ends, and moves above the yarn splicing device 12 so that the yarn YB on the bobbin B side and the yarn YP on the package P side intersect with each other. It is guided to a position outside the yarn splicing device 12 and stopped.

Note that the operations of the relay pipe 10 and the suction mouth 11 are not performed at the same time, and as described above, the yarn YP on the package P side is first sucked by the suction mouth 11 and rotated to a position outside the yarn splicing device 12. After a predetermined time has elapsed, the yarn YB on the bobbin B side is sucked into the relay pipe 10, rotates to a position outside the yarn splicing device 12, and then stops.

As shown in FIGS. 4 and 5, within a predetermined period of time after the suction mouth 11 is activated and until the relay pipe 10 starts to operate, the turning lever 20 of the yarn support device 109 on the package P side is activated to move the yarn YP. A fixed guide 16 and a rotating guide 17, 18 are sandwiched between the rotating lever 20 and the support block 21 (FIG. 14D) and are installed near the detection device 8.
The thread YP is introduced into the guide groove 19 of the detection device 8.
After the check is carried out, the swivel guide 17,1
8 is at the chain line position 17-1, 18- with the support shaft 22 as the fulcrum.
1 and remove the thread YP from the detection device 8.
It is inserted into the escape grooves 17b and 18b (Fig. 14C).

Further, the relay pipe 10 sucks the yarn YB on the bobbin B side, rotates to a position outside the yarn splicing device 12, and stops. At this time, the yarn YB passes through the hook portions 17c and 18c of the above-mentioned rotating guides 17 and 18, and is held between the yarn support plate 23a and the support block 23b of the yarn support device 108 as shown in FIG. 6 (FIG. 14E). ). Therefore, the yarn YB on the bobbin B side is not checked by the detection device 8 before the yarn splicing, but is checked after the yarn splicing is completed.

When the operations of the relay pipe 10 and the suction mouth 11 are completed, the levers 32 and 33 of the thread shifting lever 105 shown in FIGS. 2 to 6 rotate around the support shaft 31, and as shown in FIG. 14F) , the yarns YB and YP on both sides are guided separately into the respective guide grooves 59 and 60 of the fork guides 29 and 30, and are inserted into the yarn splicing hole 37 of the yarn splicing member 101 through the slit 38.

Next, the cutting devices 106 and 107 cut the threads YB-2 and YP-2 at a predetermined distance from the thread supporting devices 108 and 109 as shown in FIG. 6 (FIG. 14G).

The position at which the yarn is cut is related to the length of the spliced seam and affects the appearance, texture and binding strength of the spliced seam. The position where the yarn is cut differs depending on the yarn count.

That is, in Fig. 11, the threads YB and YP on both sides
is held between the thread support positions 108 and 109, the thread shifting lever 105 is operated, and the rod 61 shown in FIG.
The thread is cut in a state in which the levers 32 and 33 turn clockwise around the support shaft 31 as a fulcrum. Note that the thread shifting lever 105 and the cutting device 10
6, 107, the thread presser device 102 operates the rod 49 (in the direction of arrow 70) as shown in FIG.
It is located in a state where it is rotated clockwise about the support shaft 46 as a fulcrum.

Next, as shown in FIG. 12, the untwisting nozzle 10
Simultaneously or one after another, when the yarn ends YB1, YP1 are suctioned by the yarn ends YB1, YP1, the yarn shifting lever 105 moves in the direction in which the yarn shifting lever 105 is moved away from the yarn, that is, as shown in FIG. direction), rotate counterclockwise around the support shaft 31,
It separates from the thread Y. At this time, the above thread end YB1,
YP1 has nozzles 103 and 104 due to suction action.
The compressed fluid that is sucked into the yarn and jetted from the jet nozzle 51 untwists it into a state suitable for splicing. (Fig. 14H) That is, after the thread is cut, the thread shifting lever 105 moves in the direction away from the thread Y (Fig. 14F).
1) As a result, both yarn ends YP1 and YB1 are pulled into the nozzle hole by a sufficient length and untwisted.

Note that it is preferable that the suction timing of the untwisting nozzles 103 and 104 starts immediately before the yarn is cut by the cutting devices 106 and 107. That is, thread Y
When the yarn is cut, tension is applied to the yarn by the suction action of the suctions 10 and 11, so the yarn ends YP1 and YB1 are scattered and separated from the untwisting nozzles 103 and 104 positions, and the yarn ends are untwisted. nozzle 10
3, 104 may not perform the suction action on the yarn ends YB1, YP1. Therefore, basically, the untwisting nozzle 1 is operated at the same time as or before and after cutting the yarn.
Although it is also possible to apply 03 and 104, it is preferable to apply it immediately before the yarn is cut as described above.

Further, fluid is supplied to the untwisting nozzles 103 and 104 by switching valves by operating a solenoid (not shown).

Furthermore, when the yarn ends YB1, YP1 are untwisted by the untwisting nozzles 103, 104 to a state suitable for splicing, and the suction action of the untwisting nozzles 103, 104 is stopped, a second As shown in Figure 13, turn the thread guide lever 1 again.
05 operates and guides the yarn ends YB1 and YP1 to each other, while one lever 32 turns to a position where it abuts against the stopper 34 (FIG. 14 F2), and the yarn holding device 102 operates to remove the untwisting nozzle 1.
Yarn end YB inserted into the nozzle hole of 03,104
1 and YP1 are drawn into the yarn splicing hole 37 of the yarn splicing member 101, and the yarn end portions to be spliced are set in an overlapping state. At this time, the length of the seam to be spliced is determined by the turning distance of the yarn shifting lever 105 and the yarn holding device 102.

Therefore, the turning distance of the thread shifting lever 105 and the thread pressing device 102 is adjusted depending on the thread count.

Note that the yarn holding plates 48a and 48b press the yarn at the yarn ends YB1 and YP1, which are overlapped with each other.
The vicinity of the tip is preferable from the viewpoint of stability of yarn splicing, but there is no need to specifically limit it.

Furthermore, with the yarn ends YB1 and YP1 set in the splicing hole 37, splicing is performed by the action of compressed fluid jetted from the jet nozzle hole 39 (FIG. 14I). When the yarn splicing is completed, the yarn shifting lever 105 and the yarn holding device 102 move away from the yarn Y, and the drum start (K in FIG. 14) causes the yarn Y to pass through the slit 38 of the yarn splicing member 101 to the yarn splicing member. The rewind state returns to the normal rewind state described above.

The above is one cycle of the yarn splicing operation. Next, depending on the thread cutting device 106, the package side thread end YP
A case will be explained in which the connection is not disconnected. Fifth
In the state shown in the figure, that is, the yarn end YP on the package cage side is in groove 1.
7b, 18b, the thread cutting device 106 operates, but when a thread cutting error occurs, the thread between the suction mouth 11 and the package P remains connected, and the thread splicing operation described above continues. After it was done,
The turning guides 17 and 18 return to their original positions. At this time, the thread YP is connected to the clamp surface 16c of the fixed guide 16 and the clamp surface 1 of the clamp lever 110 in FIG.
It is located between 10c and the turning guides 17 and 18.
Lever 1 is moved clockwise around axis 22 of
10 also follows, and the thread YP2 is clamped and fixed between the guide 16c and the lever 110c. (Fig. 14M) Next, the package P rotates due to the start of the drum 9 (Fig. 14K), but the thread YP2 connected to the suction mouth 11 does not run and is clamped, so the package P and The yarn is forcibly cut between the clamp fixing points (Q in FIG. 2), resulting in a yarn splicing error, and the yarn splicing operation is repeated again. That is, in FIG. 2, among the threads connected between the package P and the suction mouth 11,
Assuming that the distance between the package P and the seam position J formed by the thread splicing member 101 is L, and the distance between the position J and the suction mouth 11 is l, as mentioned above, it is desirable that L = l, but it is Given a constraint, for example, assuming that L:l=6:1, the probability that the thread will be cut within the distance L is 85.7%.

Next, referring to FIG. 15, a case will be described in which the cutter 106 operates normally but an abnormality occurs in the cutter 107 and the thread between the bobbin B and the relay pipe 10 is not cut.

In FIG. 14, the relay pipe 10 descends from the standby position, sucks the bobbin side thread at the lowest position N, and
When turning in the reverse direction, the yarn end is held by the clamp plate as described above, so even if the suction yarn length is short, the yarn end is introduced into the yarn splicing device without being pulled out from the relay pipe. The package side yarn end is introduced into the yarn splicing device along the movement locus R of the suction mouth 11.

The above-mentioned yarn splicing operation is started, but during this time the relay pipe 10 is held in the position shown in FIG. Since this was not carried out, the bobbin side thread is still held by suction in the relay pipe 10. Next, in conjunction with the yarn splicing blast I, the stopper 96 rotates slightly counterclockwise following the cam 100 in FIG. 8, and the relay pipe 10 also follows and rotates clockwise around the shaft 75. When the cover 95 of the clamp member comes into contact with the fixed stopper 94 by rotating in the needle direction, the clamp plate 90 opens, and in the normal case,
That is, since the yarn is cut by the cutter 107, the yarn waste is sucked and discharged into the relay pipe 10 (FIG. 14U). However, in the above case, the thread is still not cut, so the thread on the bobbin side remains connected to the relay pipe. At the moment when the yarn splicing is completed after the splicing blast (I in Fig. 14) is completed, the seam J1 and the relay pipe 10 are connected as shown in Fig. 17.
The thread YB2 is connected between them. That is, thread
YB2 and the seam J1, the thread YB on the bobbin side are one continuous thread, and the thread YP on the package P side is connected to the thread YB on the bobbin side through the seam J1.

Next, when the drum start K is started, the relay pipe 10 is still gripping the thread YB2, so the thread YP connected to the package cage is about to be wound around the package cage, but due to the clamping force of the thread YB2. Therefore, it is forcibly cut at the joint J1. That is,
If the thread is cut at the part of the thread YB2 between the joint J1 and the relay pipe 10, the thread YP,
Even though there are three children in a row with YB, the yarn splicing is successful and the winding continues, but in this example, the strength of the seam J1 does not exceed the strength of the parent yarn, so it is necessary to The thread will be cut, and threads YP and YB will be cut, resulting in a thread splicing error. Therefore, the yarn splicing operation is restarted anew, and the winding of the triple splice due to the bobbin side yarn cutting error is prevented.

〔Effect of the invention〕

As described above, in the present invention, the bobbin side yarn end does not come off from the relay pipe, and furthermore, the three-piece splice that occurs due to a cutting error with the cutter of the yarn splicing device does not get caught in the package. In other words, even if the yarn splicing operation ends with the yarn connected between the yarn supply bobbin and the relay pipe, when the yarn runs due to the drum start, the yarn end is still held by the relay pipe, so the yarn end is still connected to the relay pipe. The thread is forcibly cut,
This will result in a thread splicing error and the thread splicing operation will be performed again.
It is possible to prevent defective joints such as triple joints from entering the package.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing an example of a winding unit to which the present invention is applied, Fig. 2 is a front view showing an embodiment of a yarn splicing device implementing the method of the present invention, and Fig. 3 is the same plane. Figures 4 and 5 are plan views showing the operating state of the device, Figure 6 is a front view showing the state in which the thread end is inserted and set in the device, and Figure 7 is the space between the package cage and the suction mouth. FIG. 8 is a side view showing the stopper mechanism of the relay pipe 10, FIG. 9 is a perspective view showing the drive mechanism of the relay pipe, and FIG. 10 is a view showing the stopper mechanism of the relay pipe 10. a perspective view showing a clamp member;
Figures 11 to 13 are schematic diagrams explaining the process of yarn splicing operation, Figure 14 is a time chart of the same, and Figure 15
The figure is a schematic diagram showing the state in which the package cage side yarn end and the bobbin side yarn end are drawn out and introduced into the yarn splicing member, FIG. FIG. 17 is a schematic diagram showing the state immediately after the bobbin side thread has been spliced in a state where the bobbin side thread has been cut incorrectly. 10... Relay pipe, 72... Stop mechanism,
74... Clamp mechanism, 90... Clamp plate, 92... Cover, 94... Stopper plate, 96
...Stoppa, B...Bobbin, YB...Bobbin side thread.

Claims (1)

[Claims] 1 After the thread on the bobbin side is suction-clamped in an automatic winder equipped with a clamp member that clamps the suctioned yarn end at the tip opening of a relay pipe that suctions the yarn end on the yarn feeding bobbin side and guides it to the yarn splicing member. The clamp member is opened only when sucking and discharging cut yarn waste until the end of one cycle of yarn splicing operation, and the clamp member is closed during other yarn splicing operations and at least when the drum is started after yarn splicing. The thread was maintained in the same state, and due to a thread cutting error, the continuous thread between the yarn supply bobbin and the relay pipe was forcibly cut by the thread running, and the thread splicing error was considered as a thread splicing error, and the splicing operation was restarted again. Features: Yarn splicing method in an automatic winder.