JP2002173837A - Method and apparatus for cutting remaining yarn in spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the amount of yarn (a remaining yarn) remaining at a spindle base part by a simple structure. SOLUTION: A remaining yarn-cutting member 8 having a bobbin-insertion part 9 and a cutter part 10 is installed in a blade 5a extending upward from the spindle base part 5b so as to be freely lifted and lowered. The remaining yarn-cutting member 8 is always urged to the spindle base part 5b side by a coil spring 11. When stopping a doffing operation, a ring rail stops at the vicinity of the contacting part of the remaining yarn-cutting member 8 with the spindle base part 5b. The spindle 4 stops in the state in which about one or less turn of the yarn is wound on the position slightly lower than the contacting part. Subsequently, when the bobbin is polled up by a doffing device, the remaining yarn-cutting member 8 is lifted together with the bobbin to the midway of the pulling up, and the yarn continued from the bobbin to a traveler is introduced between the remaining yarn-cutting member 8 and the spindle base part. Thereafter, the yarn is held between the remaining yarn-cutting member 8 separated from the bobbin, and the spindle base part 5b and cut by the cuter part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tail yarn cutting method and a tail yarn cutting device for doffing in spinning machines such as a ring spinning machine and a ring twisting machine.

[0002]

2. Description of the Related Art In a spinning machine such as a ring spinning machine or a ring twisting machine, a pipe changing operation is automatically performed when a pipe is full, so that when the pipe is restarted after the pipe changing, the yarn can be automatically wound around an empty bobbin. Thus, it is required that the yarn connected to the roller part is connected to the spindle while passing through the traveler. In order to satisfy this requirement, conventionally, a tail thread cutting section and a tail thread winding section are provided below the spindle base, and after full filling, the ring rail is rapidly lowered to perform inclined winding, and then the thread is wound around the tail thread winding section. At the time of pulling out the full thread, the thread (tail thread) connected to the full thread from the tail thread winding part was cut at the tail thread cutting part.

[0003] Japanese Patent Application Laid-Open No. 48-9 / 1984 discloses this type of cutting device.
Japanese Patent Publication No. 3735 discloses that a thread holding device having a cutting blade is provided with a bobbin seat for fitting a lower portion of a bobbin, and the thread holding device is raised together with a full thread (package) during doffing. .

In Japanese Patent Application Laid-Open No. 62-141135, a fluff portion having a direction of inclination in the circumferential direction is provided in a tail thread winding portion (thread end mooring portion), and the inclination direction of the fluff portion is different. A fluff that is alternately arranged is disclosed.

Japanese Patent Application Laid-Open No. 6-158442 discloses that a tail thread is gripped by an underwinding crown fixed to a spindle and a sliding sleeve slidably mounted on a worm to which a spindle is inserted and fixed so as to be vertically slidable. An arrangement is disclosed. This device is shown in FIG.
As shown in (a) and (b), an underwinding crown 53 is provided immediately below the bobbin fitting portion 52 of the spindle 51.
Has been fixed. An inner flange 57a for forming a receiving recess 56 is formed at an upper portion of a sliding sleeve 55 slidably mounted on the worm 54 in a vertical direction, and is interposed between the inner flange 57a and the upper surface of the worm 54. The sliding sleeve 55 is pressed and biased toward the underwinding crown 53 by the coil spring 58. An outer flange 57b is formed below the inner flange 57a, and a wear ring 59 is disposed on the outer flange 57b. In addition, a projection 60 a that can be brought into contact with the wear ring 59 is formed on the lower surface of the ring rail 60.

In this apparatus, the ring rail 6 is used when doffing.
The protrusion 60a comes into contact with the wear ring 59 while the 0 is descending to the bottom thread winding position, and then descends to the bottom thread winding position. Then, as shown in FIG. 6 (a), when the ring rail 60 is arranged at the tail thread winding position, the sliding sleeve 55 is moved via the wear ring 59 between the upper end thereof and the lower surface of the underwinding crown 53. The coil spring 58 is held at a position where a predetermined tail thread winding range can be secured against the urging force of the coil spring 58.
After the tail thread is wound around the spindle 51 three to four times in this state, the thread 61 is doffed, and the thread 61
The thread connected to is torn.

After the empty bobbin is inserted into the spindle, when the ring rail 60 rises to the winding start position, the sliding sleeve 55 is biased by the coil spring 58 to underwind, as shown in FIG. The crown 53 is raised to a position where the crown 53 is received in the receiving recess 56. At this time, the tail thread wound around the tail thread winding range is held in the receiving recess 56.

[0008]

SUMMARY OF THE INVENTION Japanese Patent Laid-Open No. 48-9373
In the apparatus disclosed in Japanese Patent Laid-Open No. 5 and JP-A-6-158442, the tail yarn is wound several times around the spindle at the time of doffing. In each case, the amount of residual yarn increases each time doffing is repeated, and it is necessary to frequently perform residual yarn processing.
In addition, since the winding length of the tail yarn is long, it is difficult to remove the remaining yarn. Particularly, in the apparatus disclosed in JP-A-6-158442, the remaining yarn is pushed into the receiving recess 56 after doffing, so that the removal of the remaining yarn is troublesome.

On the other hand, in the apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 62-141135, a thread grip portion (fuzz portion) having a special structure is provided in the tail thread winding portion, so that the length of winding of the tail thread is about one.
Winding is sufficient, and the amount of residual yarn is reduced as compared with the above-mentioned prior arts. However, it is necessary to form a special tail thread winding part, and production is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and a first object of the present invention is to provide a method of cutting a tail yarn in a spinning machine which can reduce the number of yarns (tail yarn) remaining at a spindle base with a simple structure. Is to provide. A second object is to provide a tail thread cutting device suitable for performing the cutting method.

[0011]

In order to achieve the first object, according to the first aspect of the present invention, a bobbin fitting portion into which a bobbin is fitted and a lower portion than the bobbin fitting portion are provided. Equipped with a tail thread cutting member equipped with a cutter part that can be moved up and down along a blade extending above the spindle base, and that can hold the thread connected to the tube thread from the traveler between the spindle base and the ring. Stop the rail near the contact portion between the tail thread cutting member and the spindle base,
The spindle is stopped in a state where the yarn is wound at a position below the abutting portion between the tail yarn cutting member and the spindle base, and in that state, the bobbin yarn is pulled up by a doffing device, and the tail yarn cutting member is pulled halfway. Is raised together with the tubing thread, and a thread connected to the traveler is introduced from the tubing thread between the butt thread cutting member and the spindle base. While holding the yarn, the yarn is cut by the cutter unit.

According to the present invention, the bobbin is mounted on the spindle with its lower portion fitted into the bobbin fitting portion of the tail thread cutting member. When doffing is stopped, the ring rail is lowered by the same operation as in the related art, and stops near the contact portion between the tail thread cutting member and the spindle base. Then, the spindle stops in a state where the thread is wound at a position below the contact portion between the tail thread cutting member and the spindle base. Next, the bobbin thread is pulled up by the doffing device, the tail thread cutting member is raised with the bobbin thread halfway through the pulling, and a thread connected to the traveler is guided from the bobbin thread between the tail thread cutting member and the spindle base. Thereafter, the yarn is gripped between the tail yarn cutting member detached from the tube yarn and the spindle base, and the yarn is cut by the cutter unit. The end of the yarn connected to the traveler is held between the tail yarn cutting member and the spindle base until the next doffing. Therefore, the length required for fixing the yarn connected to the traveler to the spindle for the next yarn winding can be shortened without providing a complicated yarn gripping portion. In addition, the tail thread gripped between the tail thread cutting member and the spindle base is separated from the spindle in connection with the tube thread at the next doffing.

According to a second aspect of the present invention, in the first aspect of the invention, after the ring rail stops at a predetermined position, the ring rail is moved to a position below a contact portion between the tail thread cutting member and the spindle base. The spindle is stopped with less than one thread wound. According to the present invention, the length of the yarn held between the tail yarn cutting member and the spindle base at the time of doffing can be made shorter, and at the next doffing, the yarn is reliably connected to the tube thread and detached from the spindle.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the tail thread cutting member and the bobbin thread are provided at a predetermined height between the blade and the tail thread cutting member. A restricting means is provided for restricting the ascending of the tail thread more than a predetermined height, and the tail thread cutting member is detached from the thread when the thread is pulled out above a predetermined height. According to the present invention, when the tail thread cutting member that is fitted to the tube thread and rises at the time of doffing reaches a predetermined height, the rising of the tail thread cutting member is regulated by the restricting means, and the tail thread cutting member is moved into the tube thread. From the tube thread, and a state in which the thread connected to the traveler from the tube thread is grasped.

According to the fourth aspect of the present invention, in order to achieve the second object, in the spinning machine in which the bobbin is re-started after the empty bobbin is inserted into the spindle from which the bobbin has been pulled out by the doffing device, The blade extending above the spindle base is provided with a bobbin thread cutting member having a bobbin fitting portion into which a bobbin is fitted and a cutter portion provided below the bobbin fitting portion so as to be able to move up and down. The thread cutting member is always in contact with the spindle base so that the tail thread can be gripped between the spindle base and the tail thread cutting member when the doffing is doffed between the tail thread cutting member and the blade. A restricting means is provided for restricting a rise above a predetermined height from a position in contact with the base. In the apparatus of the present invention, the yarn connected to the traveler from the yarn is gripped between the tail yarn cutting member and the spindle base at the time of doffing by the same operation as the invention of claim 3, and the yarn is cut on the yarn side. I do.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the restricting means is provided between a lower portion inside the tail thread cutting member and a stopper provided at a predetermined position of the blade. This spring is interposed and constantly biases the tail thread cutting member toward the spindle base. According to the present invention, the tail thread cutting member securely grips the thread with the spindle base by the urging force of the spring. Further, when the tail thread cutting member rises to a predetermined position at the time of doffing, separates from the tube thread, and drops, the thread can quickly reach the position where it comes into contact with the spindle base to grip the thread.

According to a sixth aspect of the present invention, in the fourth aspect of the present invention, the regulating means is provided at a predetermined position of the blade, and is brought into contact with the tail thread cutting member so as to contact the tail thread cutting member. It is a stopper that regulates the rise of
According to the present invention, the structure of the regulating means for regulating the rise of the tail thread cutting member is simplified.

According to a seventh aspect of the present invention, in the fourth aspect, a magnet is provided on either or both of the base and the tail thread cutting member in order to press the tail thread cutting member against the spindle base side. did. According to the present invention, at the position where the tail thread cutting member comes into contact with the spindle base, it is pressed against the spindle base by the attraction force of the magnet, and the thread can be reliably gripped between the tail thread cutting member and the spindle base.

According to an eighth aspect of the present invention, in the invention of any one of the fourth to seventh aspects, the bobbin fitting portion has a fitting force enhancing means for increasing a fitting force with the bobbin. Is provided. According to the present invention, when doffing, the tail thread cutting member reliably rises to the predetermined height together with the tube thread.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1A, a spindle 1 is rotatably supported by a bolster 3 fixed to a spindle rail 2 via a bearing 4. The spindle 1 includes a blade portion 5 and a spindle shaft 6 fixed to the lower central portion of the blade portion 5. The bolster 3 is inserted with the spindle shaft 6 inserted into the bolster 3.
It is supported rotatably. The blade portion 5 includes a blade 5a on which the bobbin B is mounted, and a spindle base 5b formed below the blade 5a and having a larger diameter than the blade 5a.
And a belt hook 5c formed below the spindle base 5b are integrally formed. The blade part 5 is made of aluminum or an aluminum alloy, and the spindle shaft 6 is insert-molded in the blade part 5. Blade 5a
A locking member (for example, a button chip) 7 for locking the bobbin B so as to be integrally rotatable is provided on an upper portion of the bobbin.

A tail thread cutting member 8 is provided on the blade 5a extending above the spindle base 5b so as to be able to move up and down. As shown in FIG. 1B, the tail thread cutting member 8 includes a bobbin insertion portion 9 into which the bobbin B is inserted, and a cutter portion 10 provided below the bobbin insertion portion 9. The bobbin fitting portion 9 is formed in a cylindrical shape, and has a recess 9 a for accommodating the coil spring 11 inside. A collar 12 as a stopper is fixed to the blade 5a at a position where a lower part thereof is opposed to an upper end of the bobbin fitting insertion part 9 when the tail thread cutting member 8 is in contact with the spindle base 5b. The outer diameter of the collar 12 is formed slightly smaller than the inner diameter of the concave portion 9a, and the tail thread cutting member 8 slides along the collar 12. The bobbin fitting portion 9 is formed such that its outer diameter becomes smaller toward the upper side.

The coil spring 11 is housed in the recess 9a with its lower end abutting on the lower end of the recess 9a and its upper end abutting on the lower end of the collar 12. The coil spring 11 is configured to always bias the tail thread cutting member 8 toward the spindle base 5b. Further, the coil spring 11 constitutes a restricting means for restricting the tail thread cutting member 8 from rising above a position where it comes into contact with the spindle base 5b by a predetermined height or more.

The cutter section 10 is formed in a circular shape, and in this embodiment, the diameter of the tip of the blade is formed larger than the outer diameter of the lower end of the bobbin B. An annular groove 13 is formed in a lower outer peripheral surface of the bobbin fitting portion 9, and a rubber ring 14 is housed in the groove 13 so that a part thereof is out of the groove 13. The rubber ring 14 constitutes a fitting force enhancing unit for increasing the fitting force between the bobbin fitting insertion portion 9 and the bobbin B.

Next, the operation of the above-configured device will be described. The bobbin B is fitted to the spindle 1 such that its lower part is fitted to the bobbin fitting insertion part 9 of the tail thread cutting member 8 and its upper part is engaged with the locking member 7 so as to be integrally rotatable. Then, the spindle 1 is rotated via a belt (not shown) pressed against the belt hook 5c, and the bobbin B is rotated integrally with the spindle 1.

When the spinning is continued and the tube becomes full, a predetermined stop operation is performed, and the ring rail 15 is moved in the same manner as in the prior art.
Is suddenly lowered, and the inclined winding 16a is performed on the bobbin (full bobbin) 16 mounted on the spindle 1. Thereafter, the ring rail 15 is connected to the tail thread cutting member 8 and the spindle base 5.
Stops in the vicinity of the abutting portion with the b, and the traveler 17 on the ring rail 15 is located slightly below the abutting portion between the tail thread cutting member 8 and the spindle base 5b. Then, a brake is applied so that about one thread is wound at a position slightly lower than the contact portion between the tail thread cutting member 8 and the spindle base 5b, and the spindle 1 is stopped. Next, the lappet 18 is placed in a retracted position that does not hinder the doffing,
The state shown in FIG.

Next, as shown in FIG. 2B, the bobbin (full bobbin) 16 is pulled out by the doffing device 19. The tail yarn cutting member 8 is raised together with the tubing yarn 16 during the pulling up, and the yarn Y connected to the traveler 17 is guided from the tubing yarn 16 between the tail yarn cutting member 8 and the spindle base 5b. FIG.
From the state shown in (a), the yarn Y wound around the spindle base 5b moves along the outer surface of the blade 5a when the tail yarn cutting member 8 moves up together with the tube yarn 16.

When the tail thread cutting member 8 that rises with the thread 16 reaches a predetermined height, the tail thread cutting member 8 is separated from the thread 16 by the urging force of the coil spring 11. Then, the tail thread cutting member 8 is lowered to a position where the tail thread cutting member 8 comes into contact with the spindle base 5b, and the yarn Y continuing from the tube thread 16 to the traveler 17 is gripped between the tail thread cutting member 8 and the spindle base 5b.
Since the tube yarn 16 continues to rise, the yarn Y is
0 is pressed and cut in a state of tension, resulting in the state shown in FIG. Even if the yarn Y is cut by the cutter unit 10 while the tail yarn cutting member 8 is detached from the yarn 16 and descends, the tail yarn cutting member 8 is instantaneously contacted with the spindle base 5b after the yarn Y is separated from the yarn 16. Thread Y to drop to the contact position
Is gripped between the tail thread cutting member 8 and the spindle base 5b.

After the thread 16 has been doffed to the state shown in FIG. 3B, an empty bobbin B is inserted into the spindle 1, and
After the lappet 18 has been pivoted to the winding position, the machine is restarted. The end of the yarn Y connected to the traveler 17 is gripped between the tail yarn cutting member 8 and the spindle base 5b until the next doffing. Then, the tail yarn gripped between the tail yarn cutting member 8 and the spindle base 5b is separated from the spindle 1 by being connected to the tube thread 16 at the next doffing.

This embodiment has the following effects. (1) At the time of doffing, the tail yarn cutting member 8 provided with the cutter portion 10 is raised together with the yarn 16 and then lowered, so that the yarn Y connected to the traveler 17 from the yarn 16 becomes the tail yarn cutting member 8. While being held between the spindle base 5 b and the cutter 10. Therefore, unlike the conventional device in which the tail thread is wound around the spindle 1 and gripped, it is not necessary to wind the tail thread several times, and no special tail thread winding portion is formed. Butt thread) can be reduced. Also, the tail thread gripped between the tail thread cutting member 8 and the spindle base 5b is separated from the spindle 1 by connecting to the tube thread 16 at the next doffing.

(2) A regulating means (coil spring) 11 for regulating that the tail thread cutting member 8 is raised above the predetermined height together with the yarn 16 is provided, and the yarn 16 is pulled out above the predetermined height. When this is done, the tail thread cutting member 8 separates from the tube thread 16. Therefore, when the tail thread cutting member 8 reaches a predetermined height at the time of doffing, the tail thread cutting member 8 is surely detached from the tube thread 16, and the thread connected to the traveler 17 from the tube thread 16 is held.

(3) The tail thread cutting member 8 is a coil spring 11
As a result, the tail thread cutting member 8 can reliably grip the yarn Y connected to the traveler 17 in a state in which the tail thread cutting member 8 is in contact with the spindle base 5b. Also, when the bobbin fitting insertion portion 9 is detached from the bobbin B, the tail thread cutting member 8 is urged downward by the coil spring 11, so that even if the thread Y is cut while the tail thread cutting member 8 is falling,
The tail yarn cutting member 8 can quickly reach the position where it comes into contact with the spindle base 5b, and the yarn Y can be gripped.

(4) The bobbin fitting portion 9 has a fitting force enhancing means (rubber ring 1) for increasing the fitting force with the bobbin B.
4) is provided. Accordingly, the tail thread cutting member can reliably move up to the predetermined height together with the tube thread 16 against the urging force of the coil spring 11.

The embodiment is not limited to the above, and may be embodied as follows, for example. The optimal length of the thread wound at a position below the contact portion between the tail thread cutting member 8 and the spindle base 5b is 1/3 to 1/2 winding. In this case, the tail thread gripped between the tail thread cutting member 8 and the spindle base 5b is more likely to be detached from the spindle 1 following the thread 16 at the next doffing.

The tail thread cutting member 8 is the spindle base 5b
As a biasing means for biasing the tail thread cutting member 8 toward the spindle base portion 5b in a state where it comes into contact with the magnet, a magnet (magnet) may be used instead of a spring. For example, FIG.
As shown in (1), a magnet 20 is embedded in the upper surface of the spindle base 5b, and a magnetic material (for example, iron) 21 is fixed to the lower surface of the bottom of the tail thread cutting member 8. A magnet may be provided on both sides of the spindle base 5b and the tail thread cutting member 8, or a magnet may be provided on the tail thread cutting member 8 side and a magnetic material may be provided on the spindle base 5b side. Also in this case, the yarn Y can be reliably held between the tail yarn cutting member 8 and the spindle base 5b. Further, in this case, it is not necessary to form the concave portion 9a in the bobbin fitting insertion portion 9, and the tail thread cutting member 8 is not required.
As a restricting means for restricting the rise of the blade 5, a retaining ring 22 as a stopper may be fixed at a predetermined position of the blade 5a.
The trailing thread cutting member 8 comes off the tubular thread 16 by coming into contact with the retaining ring 22 while being raised together with the tubular thread 16.

The tail thread cutting member 8 and the spindle base 5b
In place of the urging means for urging the tail thread cutting member 8 toward the spindle base 5b, at least one of the abutting surfaces of the tail thread cutting member 8 and the spindle base 5b as means for securely gripping the thread between May be roughened to increase the frictional resistance. In this case, when the next yarn is wound, the tail yarn cutting member 8
Also, even if the yarn Y gripped between the spindle bases 5b is pulled, it becomes difficult to pull out from between the tail yarn cutting member 8 and the spindle base 5b.

The fitting force enhancing means is not limited to the rubber ring 14, and a plate-like or linear spring material may be used. The spring material is not limited to a complete ring shape, and may be a ring shape with a part cut out. Further, as shown in FIG. 4B, the spring member 23 may be accommodated such that the arc portion protrudes into a concave portion 9b formed on the outer surface of the bobbin fitting insertion portion 9. FIG.
As shown in (c), the button 25 urged by the spring 24
May be provided.

The cutter section 10 is not limited to a circular shape, but may have a saw-tooth shape. Further, as shown in FIG. 5A, the annular blade body 26 may be formed as a separate body and provided with a number of caulking portions 27 to which the blade body 26 is fixed.

The outer diameter of the cutter 10 may be smaller than the outer diameter of the bottom of the bobbin B. For example, as shown in FIG. 5 (b), the lower end of the bobbin B has a bulged shape, or as shown in FIG. 5 (c), without changing the shape of the bobbin B,
The outer diameter of the cutter unit 10 may be reduced. In these cases, the yarn Y connected from the tube yarn 16 to the traveler 17 at the time of doffing
However, there is no danger that the thread will be cut before it is gripped between the tail thread cutting member 8 and the spindle base 5b.

The driving method of the spindle 1 is not limited to the belt driving, but may be a so-called single weight driving method in which a motor is provided for each weight. The invention (technical idea) that can be grasped from the embodiment will be described below.

(1) Claims 4 to 6 and 8
The invention according to any one of the above, further comprising a biasing means for biasing the tail thread cutting member toward the spindle base when the tail thread cutting member is disposed at a position where the tail thread cutting member is in contact with the spindle base.

(2) The tail yarn cutting member and the spindle base according to any one of claims 1 to 8, for securely holding the yarn between the tail yarn cutting member and the spindle base. At least one of the contact surfaces was roughened.

[0042]

As described in detail above, according to the first to eighth aspects of the present invention, it is possible to reduce the number of threads (tail thread) remaining on the spindle base with a simple structure.

[Brief description of the drawings]

FIG. 1 (a) is a partially cutaway side view of a spindle according to an embodiment, and FIG. 1 (b) is a cross-sectional view showing an attached state of a tail thread cutting member.

FIG. 2 is a side view for explaining the operation during doffing.

FIG. 3 is a side view for explaining the operation during doffing.

4A is a sectional view of a tail thread cutting member according to another embodiment, and FIGS. 4B and 4C are sectional views of another fitting force enhancing means.

5A is a schematic front view showing another embodiment of the cutter unit, and FIGS. 5B and 5C are schematic cross-sectional views showing the relationship between the lower part of the bobbin and the cutter unit according to another embodiment.

FIG. 6 is a sectional view showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... spindle, 5a ... blade, 5b ... spindle base, 8 ... tail thread cutting member, 8 ... bearing, 9 ... bobbin insertion part,
10: cutter unit, 11: coil spring as regulating means,
12: collar as stopper, 14: rubber ring as fitting force enhancing means, 15: ring rail, 16: thread, 17: traveler, 19: doffing apparatus, 20: magnet (magnet), 22: stopper Retaining ring, B ...
Bobbin, Y ... thread.

Claims (8)

[Claims] An assembling thread cutting member having a bobbin insertion portion into which a bobbin is inserted and a cutter portion provided below the bobbin insertion portion is moved up and down along a blade extending above a spindle base. Possible, and equipped so as to be able to grip the yarn connected to the tube yarn from the traveler between the spindle base and the ring rail when doffing is stopped near the contact portion between the tail yarn cutting member and the spindle base, The spindle is stopped in a state where the yarn is wound at a position below the contact portion between the tail yarn cutting member and the spindle base, and in this state, the bobbin yarn is pulled up by a doffing device, and the tail yarn cutting member is partially pulled up. The thread is raised together with the tubing thread, and guides the thread connected to the traveler from the tubing thread between the tail thread cutting member and the spindle base. Thereafter, the thread is moved between the tail thread cutting member detached from the tubing thread and the spindle base. To A tail yarn cutting method in a spinning machine for gripping and cutting the yarn with the cutter unit. 2. The spindle is stopped in a state where, after the ring rail has stopped at a predetermined position, about one or less thread is wound around a position below a contact portion between the tail thread cutting member and the spindle base. Item 2. A method of cutting a tail yarn in a spinning machine according to Item 1. 3. A restricting means is provided between the blade and the tail thread cutting member for restricting the tail thread cutting member from being raised to a predetermined height or more together with the tubing thread. 3. The tail yarn cutting method in a spinning machine according to claim 1, wherein the tail yarn cutting member separates from the tube yarn when the tail yarn cutting member is pulled out above the height. 4. A spinning machine in which a yarn is automatically wound when a machine is restarted after an empty bobbin is inserted into a spindle from which a bobbin has been pulled out by a doffing device, wherein the blade extends above the spindle base. A bobbin fitting portion into which a bobbin is fitted, and a tail thread cutting member provided with a cutter portion provided below the bobbin fitting portion so as to be able to move up and down. The tail thread can be gripped between the spindle base and the spindle base by contacting with the spindle base, and the tail thread cutting member contacts the spindle base at a predetermined position when doffing between the tail thread cutting member and the blade. A tail yarn cutting device in a spinning machine provided with a regulating means for regulating a rise above a height. 5. The regulating means is interposed between an inner lower portion of the tail thread cutting member and a stopper provided at a predetermined position of the blade, and constantly biases the tail thread cutting member toward the spindle base. The tail yarn cutting device in the spinning machine according to claim 4, wherein the tail yarn cutting device is a spring. 6. The spinning machine according to claim 4, wherein the restricting means is a stopper provided at a predetermined position of the blade and restricts a rise of the tail thread cutting member by contacting the tail thread cutting member. Ass thread cutting device. 7. The tail yarn cutting device according to claim 4, wherein a magnet is provided on either or both the base and the tail yarn cutting member for pressing the tail yarn cutting member against the spindle base side. 8. The tail yarn cutting in the spinning machine according to claim 4, wherein said bobbin fitting insertion portion is provided with a fitting force enhancing means for increasing a fitting force with the bobbin. apparatus.