JP3183000B2 - Exit device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning device for spinning a yarn end of a spinning bobbin or the like and supplying the yarn end to a winder or the like.

[0002]

2. Description of the Related Art When a spinning bobbin produced by a spinning machine is supplied to each winding unit of a winder, the bobbin is subjected to a spinning treatment so that the yarn end is easily caught.

A conventional tapping device is disclosed in Japanese Patent Application Laid-Open No. 61-155.
As disclosed in Japanese Patent No. 171, a bobbin is intermittently moved to a number of stations by a rotating plate, and a bottom bunch or a top bunch is sequentially unwound at that station, and the unwound yarn end is connected to a bobbin shaft. It is inserted into the hole to perform the yarn end processing.

[0004]

However, in this tapping device, the bobbin is moved by a rotating plate to perform tapping, so that the device tends to be large in size, and unwinding and unwinding of a bottom bunch and a top bunch are performed at each station. In order to simultaneously perform the yarn feeding process of the wound yarn end at the same timing, it is necessary to determine the timing of the intermittent movement according to the processing with the lowest efficiency among the stations, and it is difficult to increase the productivity. Further, even if the processing at the upstream station fails, for example, even if the bottom bunch cannot be unwound, there is a problem that the tapping processing is performed as it is on the downstream side.

Therefore, the present invention provides a compact and
The present invention has been devised to provide a tapping device that can perform tapping processing efficiently and reliably at a location.

[0006]

Means for Solving the Problems The present invention, care that the air flow generating means for generating a suction force, the air flow generated by the air flow generating means is elevated along the yarn layer surface of the bobbin
An airflow control member for controlling the flow, wherein the airflow control member is formed so as to be able to advance and retreat at a position surrounding a part or all of the bobbin, and a blast nozzle for giving a blast flow to the yarn layer surface of the bobbin is provided with an airflow control member. At least at the lower end of the control member, the airflow control member sprays a blast flow onto a bobbin yarn layer surface by a blast nozzle while advancing to a position surrounding a part or all of the bobbin, thereby forming a bobbin yarn. On the layer surface
The suction force that rises along with the blast flow
A strong air current is applied to the yarn layer surface of the bottle, and the yarn end is adjusted to the yarn layer surface.
Is dissociated from

[0007]

According to the above construction, the ascent rises along the surface of the yarn layer.
Suction force and blast sprayed toward the yarn layer surface
Air flow acts strongly on the bobbin yarn layer surface due to the action with the flow
Then, the yarn end is dissociated from the yarn layer by this air flow.

[0008]

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

FIGS. 1 and 2 show an embodiment of a tapping device according to the present invention. In this tapping device, a suction pipe 9 serving as an airflow generating means provided at a predetermined position (a tapping position P) of a tapping transfer path 2, and suction air from the suction pipe 9 is applied along the surface of the yarn layer 15 of the bobbin 1. A cylinder (air flow control member) that controls it to rise
5 and a blast nozzle 61 provided in the cylinder 5.

The outlet transfer path 2 transfers the bobbin 1 upright on the transfer tray T, and is provided along the round belt 31 contacting the lower surface of the tray T and along both sides of the round belt 31. The tray T includes a bottom guide plate 32 for receiving and guiding both sides of the bottom of the tray T, and an upper guide plate 34 for regulating and guiding the peg portion 33 of the tray T. Note that a flat belt may be used instead of the round belt 31. At the exit position P, a stopper (not shown) for stopping the tray T and a tray sensor 4 for detecting the presence or absence of the tray T are provided. On the upstream side,
A discriminating device for discriminating whether or not the bobbin 1 can be rewinded by the winder is provided, and it is determined that the bobbin with the minimal residual thread, the empty bobbin, and the empty tray cannot be rewinded.

The suction pipe 9 is attached to an upper side surface of a main body (housing) U of an erecting device which is erected corresponding to an evacuation position P, and has a base end connected to a source of suction air (a pump or the like). At the same time, the other end is bent downward. And the cylindrical body 5 is provided at the lower end of the suction pipe 9.
It is connected via a shutter cutter 7 and a bellows hose 6, and is formed so as to be coaxial with the bobbin 1 stopped at the outlet position P.

As shown in FIG. 3, in this embodiment, the cylindrical body 5 is formed of double peripheral walls 62 and 63, and the peripheral walls 62 and 63 and the upper and lower end surfaces 64 form a bag-shaped air chamber 65. It is partitioned. The inner diameter of the inner peripheral wall 62 is formed to be slightly larger than the outer diameter of the bobbin 1. At the lower end of the inner peripheral wall 62, four blast nozzles 61 are formed at regular intervals in the circumferential direction, and are formed to open from the air chamber 65 to the bobbin 1. This blast nozzle 61
It may be formed horizontally or slightly upward.
The outer peripheral wall 63 is formed with an inlet 66 for introducing blast air into the air chamber 65, and is connected to a pump 67 for supplying compressed air and a regulator 68 by a flexible air hose 69. An electromagnetic valve 70 for opening and closing the air passage is provided in the middle of the air hose 69. That is, by turning on the electromagnetic valve 70 at a predetermined timing, blast air of appropriate strength is blown out from the blast nozzle 61 via the air chamber 65. The blast air ejection may be performed continuously for a predetermined time or may be performed intermittently.

As shown in FIG. 4A, the hole direction of the blast nozzle 51 viewed from the plane is the center (the axis of the bobbin 1 ).
Or a radius direction toward the heart), and (b), tangential to the surface of the yarn layer 15 as shown in (c). The tangential direction is a direction in which the yarn is unwound from the yarn layer 15 of the bobbin 1, that is, a Z-twisted (b) clockwise swirling flow in the figure, and an S-twisted one. The counterclockwise swirling flow (c) is selected. Further, a blast nozzle in two directions may be provided in parallel so that any of the Z and S twists can be used. In this case, in order to switch the blast direction, as shown by the broken line in FIG.
Is provided in an intermediate portion to partition the air chamber 65 up and down (65a,
65b), a second inlet 72 for supplying blast air to the lower air chamber 65b is formed, and an air hose 69 is provided.
Or a separate blast air supply means may be provided so that compressed air can be selectively supplied to one of the upper and lower blast nozzles 61 and 71 according to the type of the bobbin 1.

As shown in FIGS. 1 and 2, an arm 10 is attached to the side of the cylindrical body 5, and the arm 1
Numeral 0 extends into the apparatus main body U through the vertical slit 11 and is supported by a vertical guide rod 12 fixed in the apparatus main body U so as to be able to move up and down. The extending end of the arm 10 is attached to a piston rod of a lifting / lowering air cylinder 14 installed on the fixed plate 13 of the guide rod 12. The lifting / lowering air cylinder 14 expands and contracts by ON / OFF of a lifting electromagnetic valve 17 a and a lowering electromagnetic valve 17 b provided in the middle of an air supply hose (not shown). Up and down.

The shutter cutter 7 includes an upper plate 7a attached to the outlet pipe 8 of the suction pipe 9, a lower plate 7b connected to the bellows hose 6, a fixed cutter (not shown) provided therebetween. The movable cutter 19 also serves as a shutter. The position of the shutter cutter 7 is set such that the distance from the head of the bobbin 1 to the shutter cutter 7 is appropriately shorter than the length of the bobbin 1. Holes 18a, 18 communicating with the bellows hose 6 and the outlet pipe 8 are provided in the upper and lower plates 7a, 7b.
b is formed. The movable cutter 19 has the hole 18
It has a substantially semicircular shape larger than a and 18b, and cuts the thread while engaging with the fixed cutter, and at the same time, cuts off the communication at the surface. A shaft rod 59 and a lever 52 are attached to one end of the movable cutter 19, and the rod 20a of the shutter actuator 20 is opened and closed by swinging the lever 52 (see FIG. 1C). . A V-shaped guide 21 for guiding the sucked yarn end to a predetermined position is provided on the in corner side of the bent portion in the suction pipe 9, and an outlet detection sensor 22 is provided facing the yarn path Y _P. (Figure 1
(B)). The output of the sensor 22 operates a shutter-cutter solenoid valve 23 for driving the shutter actuator 20. The shutter actuator 20 is supported by a bracket 53 attached to the main body U for holding the shutter cutter 7.

At the lower end of a long plate 54 suspended from the bracket 53, a suction pipe 9 is unwound from the bobbin 1.
Presser holding lever 27 that presses the yarn sucked onto bobbin 1
And an actuator 28. The head holding lever 27 is swung by an actuator 28 so as to come into contact with and separate from the head of the bobbin 1. In addition, the outlet device main body U
Is provided with a blast removal blast nozzle 25 for removing the top bunch 24 on the upper part of the bobbin 1, and a blast solenoid valve 26 for intermittently supplying air to the blast nozzle 25. This blast nozzle 2
5 is used only for the bobbin 1 of the top bunch 24, and is not used for the bottom bunch.

On the other hand, when the bobbin 1 is opened, the bobbin 1 is pulled out of the tray T when the bobbin 1 is unwound, particularly when the bobbin 1 is unwound by lowering. In order to prevent the above problem, a bobbin holding lever 29 for holding a portion of the lower part of the bobbin 1 where the thread is not wound and an actuator 30 thereof are provided. Further, a suction pipe 35 for drawing the cut fixed-length yarn Y into the shaft hole of the bobbin 1 when the fixed-length yarn is cut by the shutter cutter 7 is provided below the bottom guide plate 32 at the outlet position P. Is provided. The upper end opening of the suction tube 35 is directed toward the center of the lower surface of the tray T at the outlet position P. In the middle of the suction tube 35, a suction shutter 35a for introducing a hole is provided.
The shutter 35a is opened and closed by a solenoid 35b. On the upper guide plate 34 at the exit position P, yarn blowing nozzles 50 are provided on both sides of the bobbin 1. In each nozzle 50, two injection holes 51a for injecting blast air obliquely upward and obliquely downward toward the bobbin 1 are opened. By the blast air of the nozzle 50, for example, a yarn hanging down from the yarn layer of the bobbin 1 is formed. The bobbin pressing lever 29 is blown off from the bobbin pressing range.

Next, the operation of this embodiment will be described.

By the time the tray T reaches the tapping position P along the tapping transfer path 2, the discriminating device determines whether or not the bobbin can be rewound by a winder, that is, whether or not tapping is necessary. In the case where the tapping is unnecessary, for example, in the case of a very small residual yarn bobbin, an empty bobbin, or an empty tray on which no bobbin is placed, the tapping operation is not performed by the tapping device, and passes through the tapping position P. On the other hand, in the case of the need for tapping, for example, in the case of a full bobbin after the spinning of a spinning machine or a bobbin with a residual thread discharged from the winder and refluxed (half bobbin or bead bobbin), the following tapping operation is performed. In the case of a full bobbin provided with a bottom bunch, the bottom bunch is unwound by a bottom bunch cut station provided upstream of the exit position P.

When the tray T is transported to the exit position P, the stopper stops the tray T. When the tray sensor 4 detects the tray T, blast air is injected from the yarn blowing nozzle 50, and subsequently, the bobbin holding lever 29 (actuator 30) is operated and the lower part of the bobbin 1 is moved to the tip of the bobbin holding lever 29. Is held down by Thus, even if a suction force acts on the bobbin 1, the bobbin 1 does not fall out of the tray T. Before the bobbin 1 is pressed by the bobbin holding lever 29, the nozzle 5
Since the air is blown from 0, it is possible to prevent the yarn end from being caught between the bobbin holding lever 29 and the bobbin 1 and unsuccessful feeding is prevented.

Simultaneously with the operation of the bobbin holding lever 29, the actuator 20 is operated, the shutter cutter 7 is opened, and the suction pipe 9 and the cylinder 5 are in communication with each other. An airflow (suction force) toward the inside of the body 5 is generated. Shutter cutter 7
After the cylinder has been activated, the cylinder 5 is slightly
As shown in (1), it starts to descend from the standby position (A). However, during this short time, the yarn end of the bobbin 1 is sucked through the cylinder 5 into the suction pipe 9 and the ejection detection sensor 2
When the yarn end is detected in 2, the cylinder 5 does not descend. When the cylinder 5 descends, the cylinder 5 and the bobbin 1 gradually approach each other, so that the airflow acting on the yarn layer 15 increases. And the cylinder 5
At the same time that the chess portion 15
The electromagnetic valve 70 is turned on at the timing when the pressure reaches a, compressed air is supplied to the air chamber 65, and blast air in an appropriate direction is simultaneously blown from each blast nozzle 61 toward the surface of the yarn layer 15. Thus, the blast air is applied to the yarn layer 1.
By lowering the cylindrical body 5 while spraying it toward the surface 5,
Airflow (suction force) rising along the yarn layer surface described above,
The blast air from the blast nozzle 61 acts,
An air current is applied to the surface of the yarn layer 15 of the bobbin 1 to separate the yarn ends.
Acts strongly. During this downward movement, the exit detection sensor 22
When the yarn end is detected in step (3), the solenoid valve 70 is turned off, the blast air is stopped, and the cylinder 5 rises immediately. When the yarn end is not detected by the sensor 22, the cylinder 5 descends to a position substantially surrounding the entire bobbin 1 (the position of the stroke lower end (b) in FIG. 5). When the descent to the lower end of the stroke is completed, the ascending operation starts. By the time the cylinder 5 has finished ascending to the upper end of the stroke (standby position (a)), almost all of the yarn ends will be sucked up into the suction pipe 9 if the bobbin is a normal bobbin. Tier 1
In the case of sticking to the surface of the cylinder 5, the yarn end is not detected by the sensor 22, and the cylinder 5 performs the lowering operation again, and the lowering and raising of the cylinder 5 and the blast air blowing are performed three times in total. Repeated as a limit. If the yarn end is still not detected by the sensor 22, the stopper is released and the tray T is paid out from the exit position P. The number of repetitions is not limited to three, but may be one or four or more. Further, the blast air of the yarn blowing nozzle 50 is stopped during a period from when the cylindrical body 5 starts to ascend to when it starts to descend next. This is electromagnetic valve 1
This can be easily achieved by receiving signals from 7a and 17b.

When the yarn end is detected by the sensor 22 and the injection of the blast air from the blast nozzle 61 is stopped and the cylinder 5 rises to reach the upper end (a) of the stroke,
This is detected by a sensor (not shown), and the head holding lever 27 is actuated to abut the head of the bobbin 1 to hold the yarn connected between the bobbin 1 and the suction pipe 9, and the yarn is excessively pulled out from the yarn layer 15. To prevent Instead of setting the upper end of the stroke, the head holding lever 27 may be operated when the cylinder 5 rises to a predetermined height on the way. The point is that the cylinder 5 and the head holding lever 27 should not interfere with each other. At the same time as the operation of the actuator 28, the solenoid 35b also operates, the top hole suction shutter 35a opens, and a downward suction force acts on the shaft hole of the bobbin 1.

Thereafter, the actuator 20 is operated to close the shutter cutter 7, and the yarn sucked from the bobbin 1 into the suction pipe 9 is cut by the shutter cutter 7 and the suction air is shut off. The yarn end connected to the cut bobbin 1 is sucked into the shaft hole of the bobbin 1 by the suction force of the suction tube 35. Here, bobbin 1
Is set to be shorter than the length of the bobbin 1, so that the yarn end sucked into the bobbin 1 does not extend through the tray T to the bottom guide plate 32.

Subsequently, the actuator 28 operates to return the head holding lever 27 to the original position, the bobbin holding lever 29 returns to the original position, and the suction shutter 35a.
Closes. Thereafter, the stopper holding the tray T is released, the tray T is discharged from the discharging position P, and supplied from the discharging transfer path 2 to each winding unit of the winder.

In the case of a full bobbin provided with a top bunch, after the shutter cutter 7 is opened, first, blast air is jetted from the bunch removal blast nozzle 25 toward the bunch winding portion of the bobbin 1 for a predetermined time. The bunch is unwound. Subsequently, the cylinder 5 starts to descend, and thereafter, the same operation as in the case of the bottom bunch is performed.

As described above, the yarn layer 15 of the bobbin 1 to be spouted is covered with the cylindrical body 5 and suction air is generated by supplying suction air into the cylindrical body 5. while lowering the since to blow blast air on the surface of the yarn layer 15 of the bobbin 1, the suction
By the action of the air flow and the blast air, the surface of the yarn layer 15 is
The yarn end can be pulled out by a strong airflow acting on the bobbin 1, and the bobbin 1 can be easily, efficiently, and reliably discharged by one stop. Further, the configuration can be made compact, and space saving and cost reduction can be achieved. Change
The bobbin 1 is actuated by the action of the suction airflow and the blast air.
Of strong air current on the surface of the yarn layer 15
In the case where the yarn end is entangled with the yarn layer 15 or the yarn
For example, when the yarn end is stuck on the surface of the yarn layer 1
Even when it is difficult to release the yarn end, the yarn end can be released smoothly and securely.
Can be made. In this embodiment, since the cylinder 5 has a double structure to supply compressed air to the air chamber 65, the number of intakes 66 and the number of air hoses 69 are required regardless of the number of blast nozzles 61. The number of components is minimized, the number of parts can be reduced, and the periphery of the cylinder 5 does not become complicated.

Further, the taping device according to the present invention has a great advantage that processing can be performed regardless of the type and shape of the bobbin. That is, regardless of whether the bobbin is S-twisted or Z-twisted, bobbins having different lengths, bobbins having different diameters (different shapes), and semi-balls, small balls, and beaded bobbins. You can do it. Furthermore, it is also possible to dispense a chess-cut bobbin and a bobbin that has been handed over by spinning, and to dispense a bobbin with either a top bunch or a bottom bunch.

The following is also possible. That is, as shown by a two-dot chain line in FIGS.
0, a bobbin detection sensor 16 for detecting a chess portion 15a of the yarn layer 15 of the bobbin 1 is provided.
The cylinder body 5 is lowered based on the detected value of. In this case, irrespective of the detection of the outlet detection sensor 22, the cylinder 5 is lowered until the bobbin detection sensor 16 detects the chess portion 15a. Thereafter, if the exit detection sensor 22 detects the yarn end, the cylinder 5 may be raised,
You may make it raise after predetermined time passes. The method of lowering the cylinder 5 while looking at the chess part 15a is preferably used when the cylinder 5 has a shape along the chess part 15a.

The bobbin 1 to be spouted is a full bobbin produced by the spinning machine as described above, a half bobbin discharged by the winding unit without thread breakage and splicing, and the bobbin 1 is conveyed again due to unsuccessful spouting. And bobbins. Further, there are a bobbin having a top bunch and a bobbin having a bottom bunch at the end of winding of the yarn, and it is more preferable to select the shape of the cylindrical body 5 according to the type and shape of the bobbin 1. The gap between the inner peripheral wall 62 of the cylindrical body 5 and the surface of the yarn layer 15 of the bobbin 1 is preferably as small as possible (10 mm or less). Therefore, as the shape of the cylindrical body 5, the bobbin 1
In addition to the cylindrical shape having the same diameter from the upper part to the lower part of the bobbin, the upper part may be shaped like an inverted flare according to the shape of the chess part 15a of the bobbin 1. Further, it may be formed of a fixed portion provided to cover the outer periphery of the bobbin 1 and an inverted flare-shaped movable portion that slides inside the fixed portion and can move up and down according to the height of the chess portion 15a. In this case, the blast nozzle is provided on the fixed part. The fixing portion has a half-split structure that can be freely opened and closed, and is substantially moved back and forth to a position surrounding part or all of the bobbin 1 by an opening and closing mechanism.

In the above embodiment, the shutter cutter 7 is provided on the suction pipe 9, but a cutter may be provided on the cylindrical body. In addition to connecting the suction pipe 9 and the cylindrical body 5 with a bellows hose 6 or the like, it is possible to control the air along the surface of the yarn layer of the bobbin even in a divided state. Further, in place of the bobbin holding lever 29, a plunger or the like which moves forward and backward with respect to the lower end of the bobbin by a solenoid may be provided. Instead of the cylinder 5 having a double structure, an appropriate number of blast nozzles may be formed in a single tubular cylinder, and compressed air may be supplied by air hoses directly connected to the blast nozzles.

Next, FIG. 6 shows an example in which the taping device A of the present invention is incorporated in an automatic winder W. In the figure,
40 is an actual bobbin transport line for supplying the actual bobbin to the winder W, and 41 is an empty bobbin discharge line. The actual bobbin from the spinning machine is supplied from the actual bobbin supply line 42 to the tray T in an upright state. The empty bobbin conveyed from the bobbin discharge line 41 is supplied to a spinning machine (not shown) from an empty bobbin supply line 44 after stripping the minimal residual yarn from the bobbin with a stripper 43. Further, the half bobbin conveyed from the bobbin discharge line 41 is returned from the return line 45 to the actual bobbin conveyance line 40 without being processed by the stripper 43.

The tapping transfer path 2 is formed so as to branch off from the actual bobbin transport line 40 and extend in parallel, and then join. The tapping device A is provided in the middle of the tapping transfer path 2. Have been. In this case, on the upstream side of the tapping device A, the bobbin provided with the bottom bunch is
A rotary cutter device 46 for cutting the bottom bunch is provided. In the case of a top bunch, a searcher (a device for searching for and cutting a back wind of a bobbin) is provided instead of the rotary cutter 46. In the case of a bottom bunch, a rotary cutter device and a searcher may be provided side by side.

It is to be noted that the taping device A is provided with an auxiliary transfer path 2a as shown by a two-dot chain line in FIG.
Are connected in parallel to the outlet transfer path 2 and the auxiliary transfer path 2
a may also be provided. In this case, the full bobbin provided with the top bunch or the bottom bunch is fed out through the feeding transfer path 2, and the half bobbin and the bobbin whose feeding processing is unsuccessful are supplied to the auxiliary transfer path 2a and the feeding device. A may be processed.

The bobbin after the tapping process is returned to the actual bobbin transport line 40 and supplied to the winder W. The bobbin for which the tapping process is unsuccessful is passed from the bypass line 47 to the empty bobbin discharge line 41, and the half bobbin is discharged. The tapping process is performed again together with the bobbin. Note that the tapping device A of the present invention may also be provided in the bypass line 47 to process unsuccessfully tapping bobbins.

FIG. 7 shows an example in which the tapping device A of the present invention is incorporated into an existing tapping device 48 (for example, a device disclosed in Japanese Patent Publication No. 5-5746) connected to the winder W. The existing outlet device 48 is provided on the actual bobbin transport line 40, and the outlet device A of the present invention is provided on the bypass line 47 connecting the actual bobbin transport line 40 and the bobbin discharge line 41. In other words, the bobbin for which the taping process has not been successfully performed by the existing taping device 48 is subjected to the tapping process by the tapping device A of the present invention. In this case, the taping device A of the present invention is a winder W
It may be provided inside. Other configurations are the same as those in FIG.

[0036]

In summary, according to the present invention, the following excellent effects are exhibited.

A blast nozzle which covers all or a part of the yarn layer of the bobbin to be discharged by the airflow control member, generates a suction airflow in the airflow control member by the airflow generation means, and gives a blast flow to the yarn layer surface of the bobbin. Air flow control unit
While lowering the material along the bobbin,
Since the last flow is blown , the tapping process can be easily and reliably performed at that position with a compact configuration.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a tapping device according to the present invention, wherein (a) is an overall perspective view, (b) is a partial cross-sectional view, and (c) is a perspective view of a main part. .

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a side sectional view showing a cylinder and a blast nozzle of FIG. 1;

FIG. 4 is a plan sectional view of FIG. 3;

FIG. 5 is a side view for explaining the operation of FIG. 3;

FIG. 6 is a plan view showing an example in which the taping device of the present invention is incorporated in a winder.

FIG. 7 is a plan view showing an example in which the taping device of the present invention is incorporated in a winder together with an existing tapping device.

[Explanation of symbols]

 Reference Signs List 1 bobbin 5 cylinder (airflow control member) 9 suction pipe (airflow generating means) 15 thread layer 61 blast nozzle

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 67/00-67/08

Claims (1)

(57) [Claims] An airflow generating means for generating a suction force; and an airflow control member for controlling an airflow such that an airflow generated by the airflow generating means rises along a surface of a yarn layer of a bobbin. The airflow control member is formed so as to be able to advance and retreat at a position surrounding part or all of the bobbin, and a blast nozzle for giving a blast flow to the yarn layer surface of the bobbin is provided at least at a lower end portion of the airflow control member. ,
The airflow control member sprays a blast flow onto the bobbin yarn layer surface by the blast nozzle while advancing to a position surrounding a part or the entirety of the bobbin.
Due to the effect of the suction force rising along
And apply a strong air current to the bobbin yarn layer surface to trim the yarn end.
An opening device characterized by dissociating from a layer surface .