KR20040098503A - Yarn tip cutting device in spinning machine - Google Patents

Abstract

PURPOSE: A tail yarn cutting device of a spinning machine is capable of shortening tail yarn of a spindle base part at stopping doffing without complicated motion of a ring rail. CONSTITUTION: A tail yarn cutting device of a spinning machine is automatically wound at re-starting the spinning machine after inserting an empty bobbin onto a spindle from which cop is pulled up by a doffing device. The tail yarn cutting device comprises: a blade(5a) extended from a spindle base part(5b) in an upper direction; a tail yarn cutting member(8) which is installed on the blade(5a) to be capable of elevating, containing a bobbin inserting part(9) inserted the bobbin and a cutter part(10) installed on a lower part than the bobbin inserting part(9); plural convex parts(13a)(13b) and concave parts(14a)(14b) installed on the lower end of the tail yarn cutting member(8) and an upper end of the spindle base part(5b) opposed to the lower end of the tail yarn cutting member(8), and engaged with each other; and a regulating device which is installed between the tail yarn cutting member(8) and the blade(5a), regulating the tail yarn cutting member(8) from elevating beyond a position that the tail yarn cutting member(8) is contacted with the spindle base part(5b) during doffing. A lower end of the tail yarn cutting member(8) is contacted with the spindle base part(5b), so is capable of gripping tail yarn between the spindle base part(5b) and the lower end.

Description

Thread end cutting device in spinning machine {YARN TIP CUTTING DEVICE IN SPINNING MACHINE}

The present invention relates to a thread end cutting device in a spinning machine, and more particularly, the thread is automatically wound upon restarting the base after the empty bobbin is inserted into the spindle from which the article is lifted by the doping device. The present invention relates to a thread cutting device in a spinning machine.

In spinning machines such as ring spinning machines and ring twisters, which wind the thread through the traveler, the thread bobbin is automatically applied to the ball bobbin when the pipe is restarted after the pipe replacement in order to automatically perform the pipe replacement work at the time of full pipe. It is required that a seal connected to the roller portion be connected to the spindle while passing through the traveler so as to be wound by the roller. In order to satisfy this demand, conventionally, a thread end cutting part and a thread end winding part are provided at the base of the spindle, the ring rail is descended after the full pipe is subjected to the inclination winding (body winding), and then the thread is wound around the thread end winding and filled. When the filled tube was withdrawn, the thread (thread end) connected from the thread end winding to the filled yarn was cut at the thread end cut.

By the way, in this cutting method, the thread end wound on the thread end winding part remains doped after the doping, and the residue amount increases every time the doping is repeated, and it is necessary to frequently process the residue. In addition, there is a problem that it is difficult to remove the residue because the length of the winding end is long.

In order to solve the above problem, the gripping part is gripped by a gripping part capable of opening and closing the thread connected to the article from the traveler, and the thread connected to the article from the gripping part is cut by a cutter by a pulling-out operation of the article by a doping device. A cutting method is proposed (see Patent Document 1 and Patent Document 2, for example).

Patent Literature 1 discloses a device having a structure in which a thread tip is gripped by an under winding collar fixed to a spindle and a sliding sleeve equipped to slide the spindle in a vertical direction to a wharve in which the spindle is inserted and fixed. In this apparatus, as shown in FIGS. 6 and 7 of the present specification, the underwinding collar 52 is fixed to the lower portion of the bobbin fitting portion 51 of the spindle 50, and under the underwinding collar 52. A plurality of protrusions 53 extending in the axial direction of the spindle 50 are provided. The wob 54 (wall) of the spindle 50 is provided with a sliding sleeve 55 which is guided to the protrusion 53 and slides upward and downward, and the sleeve 55 has an upper end of the under winding collar 52. It is elastic by the compression spring 56 so that the lower surface may contact. Below the under winding collar 52, the knife 57 is provided in the outer side of the sleeve 55. As shown in FIG.

In this apparatus, when the ring rail 58 descends to the thread end wound position at the time of doping, the downward stopper 58a of the ring rail 58 contacts the stopper ring 55a of the sleeve 55, and then the ring rail 58 With the lowering of the sleeve 55, the sleeve 55 lowers together with the ring rail 58 against the elastic force of the compression spring 56. As shown in FIG. 6, in the state in which the ring rail 58 is disposed at the thread end wound position, the seal Y connected to the tube 60 through the traveler 59 is connected to the lower surface and the sleeve of the underwinding collar 52. 55) is arranged between the top of the. In this state, the ring rail 58 is raised again and stopped at the doping position, whereby the lower end of the underwinding collar 52 and the upper end of the sleeve 55 are held in a state in which the end of the thread is wound on the spindle 50 or less. It becomes a state. In this state, the yarn 60 is doped, and the yarn Y connected to the yarn 60 is cut by the knife 57 during the doping. In addition, it is also disclosed that the thread Y, which is connected to the tube 60 in the middle of the doping, may be attached to the edge of the underwinding collar 52 without cutting the knife 57 to cut it. It is also disclosed to form a serration on the lower surface of the underwinding collar 52 and to form a serration on the upper end of the sleeve 55 to be engaged with the serration.

On the other hand, in the method of patent document 2, as shown in FIG. 8 of this specification, the thread tip provided with the bobbin fitting part 61a and the cutter part 61b in the blade 50b extended upward from the spindle base 50a. The cutting member 61 is provided so that it can be elevated. The thread end cutting member 61 is always elastic to the spindle base 50a side by the coil spring 62. At the time of doping stop, the ring rail stops in the vicinity of the contact portion between the thread cutting member 61 and the spindle base 50a. And the spindle 50 stops in the state in which the thread of about 1 wound or less is wound in the position slightly below the contact part. The article is then pulled up by the doping device, and the thread tip cutting member 61 is raised together with the tube until the way up, and the thread connected to the traveler from the yarn between the thread tip cutting member 61 and the spindle base 50a is guided. . Thereafter, the yarn is gripped by the thread tip cutting member 61 and the spindle base 50a which are separated from the yarn, and the yarn is cut by the cutter portion 61b.

[Patent Document 1]

Japanese Patent Application Laid-open No. Hei 10-317233 (specifications paragraphs [0013] to [0018], FIGS. 1 to 4 and FIG. 7).

[Patent Document 2]

Japanese Unexamined Patent Publication No. 2002-173837 (Specification paragraph [0021] to [0028], FIGS. 1 to 3)

In the thread cutting method described in Patent Literature 1 and Patent Literature 2, the yarn tip can be held by a winding amount of 1 winding or less. By the way, in the apparatus disclosed in Patent Literature 1, a compression spring 56 which moves together with the underwinding collar 52 to support the sleeve 55 where the thread is gripped so as to contact the lower surface of the underwinding collar 52 is essential. to be. The compression spring 56 pushes the sleeve 55 upward against the weight of the sleeve 55 and the stopper ring 55a, and simultaneously pushes the sleeve 55 out of the underwinding collar 52 with the force necessary for gripping. It needs to touch the lower surface. Therefore, the compression spring 56 requires a spring force that is larger than the elastic force required for gripping.

In a ring spinning machine, there are generally around 200 single-sided weights and, if the machine has a long base, 400 single sided spindles or more. Therefore, since it is necessary to lower the ring rail 58 against the elastic force of the plurality of compression springs 56, a large power is required to lower the ring rail. Moreover, in the structure which passively descends a ring rail by the weight of a ring rail, it becomes difficult to descend to a predetermined thread end winding position. Further, the control up to stopping the ring rail 58 in the doping stop position is complicated.

On the other hand, in the method described in Patent Literature 2, the thread tip cutting member 61 is moved from the grip position to the open position with the article along with the doping operation of the doping apparatus, and the ring rail only needs to move downward to the doping stop position. Lowering control of the ring rail is simplified compared to Patent Document 1. Since the thread tip cutting member 61 grips the yarn between its lower surface formed horizontally and the top surface of the spindle base 50a, if the pressing force of the thread tip cutting member 61 is small, the thread is cut at the start of winding after the ball bobbin insertion. It may come out of a grip part and cannot wind up. In order to increase the holding force by the thread cutting member 61, if the weight of the thread cutting member 61 itself is increased or the elastic force of the coil spring 62 is increased, the operation of the doping apparatus may be hindered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and its object is to avoid the complicated operation of the ring rail at the time of doping stop, which does not interfere with the operation of the doping apparatus, and to shorten the thread (thread tip) remaining on the spindle base. To provide a thread cutting device in the spinner can be.

FIG. 1A is a partially broken schematic side view of the spindle of one embodiment, and FIG. 1B is a cross-sectional view illustrating a mounting state of a thread cutting member.

2 is a schematic perspective view of the thread cutting member and the spindle base;

3 is a partial schematic development view showing a holding state of a yarn.

(A)-(d) is a side view explaining the action at the time of doping.

5 is a schematic perspective view of the spindle base of another embodiment.

6 is a cross-sectional view showing the prior art.

7 is a partial cross-sectional view showing the prior art.

8 is a cross-sectional view showing another conventional technology.

Explanation of symbols on the main parts of the drawings

B… Bobbin Y… room

One … Spindle 5a... blade

5b... Spindle base 8... Thread end cutting member

9. Bobbin insert 10. Cutter part

11. Coil Springs Composing Regulating Means

13a, 13b... Projections 14a, 14b... Recess

16a, 23a... Curved surface 19. Articles

22. Doping device

In order to achieve the above object, the invention as set forth in claim 1 is a thread end cutting device of a spinning machine in which a thread is automatically wound when a base is restarted after a ball bobbin is inserted into a spindle that has been pulled out by a doping device, It is equipped with the blade extended upward. In addition, it is provided so as to be able to lift and lower on the blade, and at the same time having a bobbin insertion portion into which the bobbin is fitted, and a cutter portion provided below the bobbin insertion portion, and the lower end portion is in contact with the spindle base and is interposed therebetween. And a thread cutting member capable of gripping the thread tip. It is provided with the lower end part of the said thread end cutting member, and the several convex part and recessed part which are provided in the upper end part of the said spindle base which oppose this lower end part, and can be engaged with each other. It is provided between the said thread cutting member and the said blade, and is provided with the restriction means which regulates that the said thread cutting member is raised more than a predetermined height above the position which abuts the said spindle base at the time of doping.

In the present invention, the bobbin is mounted on the spindle while its lower part is fitted to the bobbin fitting portion of the thread end cutting member. The ring rail is lowered at the time of the doping stop, and the ring rail is stopped in a state in which the thread connected to the tube via the traveler passes through the thread end cutting member and the position below the contact portion of the spindle base. Then, the spindle stops in a state where the thread is wound at a position below the contact portion between the thread end cutting member and the spindle base. The article is then pulled out by the doping device, and on the way out the thread is connected between the thread cutting member and the spindle base from the article to the traveler. Thereafter, the rising of the thread cutting member is regulated by the restricting means, and the thread cutting member is separated from the article and lowers. Then, the thread is gripped between the thread end cutting member and the spindle base separated from the tube, and the thread is cut by the cutter. The end of the thread connected to the traveler is gripped between the thread cutting member and the spindle base until the next doping. The yarn held between the thread tip cutting member and the spindle base is released from the spindle with the article at the next doping. Since the thread is held in a bent state by a plurality of convex portions and recesses provided at the lower end of the thread end cutting member and the upper end of the spindle base opposite the lower end, a force for pressing the thread end cutting member toward the spindle base side interferes with the operation of the doping apparatus. Even if it is small so as not to give a grip, holding of a thread is performed reliably. Therefore, the complicated operation of the ring rail is not necessary at the time of doping stop, and it is possible to shorten the thread (thread tip) remaining on the spindle base without disturbing the operation of the doping apparatus.

In the invention according to claim 2, in the invention according to claim 1, the plurality of convex portions and the concave portions are provided so as to extend in the radial direction. In the present invention, the yarn is in a zigzag state in a state of being gripped by a plurality of convex portions and concave portions, so that the yarn can be held in a gripped state even if the pressing force of the thread end cutting member is small.

In the invention according to claim 3, in the invention according to claim 1 or 2, the lower end of the thread end cutting member includes a virtual cone having a vertex including the outer periphery of the lower end with the spindle as the center of rotation, and located above the plane orthogonal to the spindle. It is formed to constitute a part of the slope.

When the force in the direction of pulling the thread out of the grip portion acts on the thread wound within 1 winding of the spindle, the force acting radially and outwardly on the thread. In this case, when the gripping surface is inclined downward as in the present invention, compared with the case where the yarn is held in the horizontal plane, the resistance applied to the yarn becomes large and the yarn is difficult to be pulled out. As a result, the pressing force of the thread end cutting member required for holding the thread can be made smaller than in the case where the holding surface is horizontal.

Invention of Claim 4 is provided with the center adjustment means which ensures concentricity with respect to the said spindle base of the said thread cutting member in the invention in any one of Claims 1-3. In the present invention, since the thread end cutting member is rotated concentrically with the spindle by the action of the center adjusting means, it is difficult to generate vibration during the rotation can be rotated stably even in the case of high-speed rotation.

In the invention according to claim 5, in the invention according to claim 4, the center adjusting means is provided at a position where the thread end cutting member and the spindle base face each other, and a curved surface constituting an inclined surface of the virtual cone having the spindle as the center of rotation. Equipped with. In the present invention, when the thread end cutting member which is separated from the spindle base at the time of doping and moved above the spindle base is lowered and engaged with the spindle base again, the curved surfaces are engaged so that the thread end cutting member is coaxial with the spindle. This is regulated.

In the invention according to claim 6, in the invention according to any one of claims 1 to 5, one of the portions engaged with the spindle base and the spindle base of the thread end cutting member is made of metal and the other is made of resin. In the case where both are made of metal, when the thread end cutting member is detached from the thread and falls (falls) to hold the thread between the spindle bases, the thread is caught by the grip part due to the impact between the holding part when the thread is thin. There is a risk of cutting at the end. In this case, the thread from the spindle base to the traveler is cut off and automatic winding of the thread at restart is impossible. However, by using one resin, it is possible to prevent the thread from being cut at the end of the gripping portion due to the impact of the gripping even when the thread is thin.

Embodiment of the invention

EMBODIMENT OF THE INVENTION Below, one Embodiment which actualized this invention is described according to FIG.

As shown in FIG. 1A, the spindle 1 is supported by the bearing 4 to be rotated by the bolster 3 fixed to the spindle rail 2. The spindle 1 has a blade portion 5 and a spindle shaft 6 fixed to the lower center of the blade portion 5, and the bolster 3 in a state where the spindle shaft 6 is inserted into the bolster 3. It is supported so that it can rotate. The blade portion 5 includes a blade 5a on which the bobbin B is mounted, a spindle base 5b formed at a lower side of the blade 5a and having a larger diameter than the blade 5a, and a lower side of the spindle base 5b. The belt hanger part 5c formed in this is provided. The blade 5 is made of aluminum or an aluminum alloy except for the spindle base 5b, and the resin spindle base 5b is fitted to the lower part of the blade 5a to be fixed. The spindle shaft 6 is insert molded into the blade portion 5. The upper portion of the blade 5a is equipped with a locking member 7 (for example, a button chip) for hanging the bobbin B so as to rotate integrally.

The blade tip cutting member 8 is provided on the blade 5a extending upward from the spindle base 5b so that the thread cutting member 8 can move up and down. As shown in FIG. 1B, the thread cutting member 8 includes a bobbin fitting portion 9 into which the bobbin B is fitted, and a cutter portion 10 provided below the bobbin fitting portion 9. Equipped with. The cutter part 10 has the annular blade body 10a as a separate body, and is equipped with the some latching convex part 10b which fixes the blade body 10a. In this embodiment, the tip diameter of the blade body 10a is formed larger than the lower end diameter of the bobbin B. As shown in FIG.

The bobbin fitting part 9 is formed in the cylindrical shape, and the recessed part 9a which accommodates the coil spring 11 inside is formed. The thread end cutting member 8 is always configured such that the lower end portion is in contact with the spindle base 5b so as to hold the thread tip between the spindle bases 5b.

The collar 12 as a stopper is fixed to the blade 5a at a position where the lower end thereof faces the upper end of the bobbin fitting portion 9 while the 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 recess 9a, and the thread cutting member 8 slides along the collar 12. The bobbin fitting part 9 is formed so that the outer diameter may become small as it goes up.

The coil spring 11 is accommodated in the recess 9a in a state where the lower end abuts on the lower end of the recess 9a and the upper end abuts on the lower end of the collar 12. The coil spring 11 constitutes a spring in which the thread end cutting member 8 is always elastic to the spindle base 5b side. In addition, the coil spring 11 is provided between the thread cutting member 8 and the blade 5a to restrict the thread cutting member 8 from rising to a predetermined height or more than a position where the thread cutting member 8 abuts against the spindle base 5b at the time of doping. A regulatory means is provided.

As shown in FIGS. 1B and 2, the lower end of the thread cutting member 8 and the upper end of the spindle base 5b facing the lower end have a plurality of protrusions 13a and 13b that can be engaged with each other. ) And recesses 14a and 14b are provided to extend in the radial direction. Therefore, the lower end part of the thread end cutting member 8 and the upper end part of the spindle base 5b are comprised with the some gear meshed with each other. The convex portions 13a and 13b and the concave portions 14a and 14b are formed in a rectangular shape in cross-sectional shape perpendicular to the radial direction. As for the height of the convex part 13a, 13b, and the depth of the recessed part 14a, 14b, about 2 mm is preferable.

The lower end of the thread end cutting member 8 is formed such that the spindle 1 is the center of rotation, and the vertex constitutes a part of the inclined surface of the virtual cone located above the plane orthogonal to the spindle 1 including the lower end outer periphery. . The upper end of the spindle base 5b is also formed so that the spindle 1 is the center of rotation, and the vertex constitutes a part of the inclined surface of the virtual cone located above the plane orthogonal to the spindle 1 including the lower end outer periphery.

The end surface 15 of the blade 5a side of each convex part 13b of the spindle base 5b is formed so that it may become the curved surface which comprises the inclined surface of the downward virtual cone which made the spindle 1 the rotation center. . On the blade 5a side of each recess 14a of the thread cutting member 8, a wall having a curved surface 16a which can be in contact with the end surface 15 and constitutes an inclined surface of the virtual cone having the spindle as the center of rotation. (16) is formed. The end face 15 and the wall 16 constitute a center adjusting means for securing concentricity with respect to the spindle base 5b of the thread end cutting member 8.

The lower outer peripheral surface of the bobbin fitting portion 9 is formed with an annular groove 9b, and the rubber ring 17 is accommodated in the groove 9b in a state where a part thereof protrudes out of the groove 9b. The rubber ring 17 constitutes a fitting force increasing means for improving the fitting force between the bobbin fitting portion 9 and the bobbin B. FIG.

Next, the operation of the device configured as described above will be described.

The bobbin B is fitted to the bobbin fitting portion 9 of the thread cutting member 8 so that the bobbin B can rotate integrally with the spindle 1 while the upper part is engaged with the locking member 7. Is mounted. Then, the spindle 1 is rotated through the belt (not shown) pressed against the belt hook portion 5c, and the bobbin B is rotated integrally with the spindle 1.

If it continues to be discharged and becomes full, predetermined stop operation | movement will be performed, and by the same operation | movement as before, the ring rail 18 will descend | fall and incline to the tube 19 (bay bobbin) attached to the spindle 1, Winding (19a: fuselage winding) is performed. Thereafter, the ring rail 18 is in a state in which the thread Y connected to the tube 19 via the traveler 20 passes through a position below the contact portion between the thread end cutting member 8 and the spindle base 5b. Is stopped. Then, the brake is engaged to stop the spindle 1 at a position below the abutment portion of the thread end cutting member 8 and the spindle base 5b so as to be wound. Next, the latte 21 is arranged in the retracted position which does not interfere with the doping, and is in a state shown in FIG.

Next, as shown in FIG.4 (b), the article 19 (full bobbin) pulls out with the doping apparatus 22. FIG. The thread end cutting member 8 is raised together with the tube 19 until the way out, and the thread Y connected to the traveler 20 from the tube 19 between the thread end cutting member 8 and the spindle base 5b is Induced. In the state shown in FIG. 4A, the yarn Y wound on the spindle base 5b moves along the outer surface of the blade 5a when the thread tip cutting member 8 is raised together with the tube 19. .

When the thread tip cutting member 8 which rises with the tube 19 reaches a predetermined height, the thread tip cutting member 8 is separated from the yarn 19 by the elastic force of the coil spring 11. And the thread tip cutting member 8 descends to the position which abuts the spindle base 5b, and the thread Y connected to the traveler 20 from the tube 19 is the thread tip cutting member 8 and the spindle base 5b. It is held by the liver. Since the article 19 continues to rise, the thread Y is pressed against the blade body 10a in a tensioned state, and is cut to be in the state shown in Fig. 4C. Even if the thread Y is cut by the blade body 10a while the thread tip cutting member 8 is separated from the thread 19 and descends, the thread tip cutting member 8 is momentarily separated from the thread 19. Since it falls to the position where it is in contact with the spindle base 5b, the seal Y is gripped between the thread end cutting member 8 and the spindle base 5b.

3 is a partial schematic development view showing a state in which the yarn Y is gripped by the fitting between the thread cutting member 8 and the spindle base 5b. The yarn Y is gripped in a zigzag state between the plurality of convex portions 13a and 13b and the concave portions 14a and 14b provided on the thread end cutting member 8 and the spindle base 5b. Since the heights of the convex portions 13a and 13b and the depths of the concave portions 14a and 14b are about 2 mm, they can be gripped without being cut even if the thread is thin. In addition, in FIG. 3, in order to make clear the relationship between the yarn Y, the convex parts 13a, 13b, and the recessed parts 14a, 14b, the thread Y, the convex parts 13a, 13b, and the recessed parts 14a, 14b are shown. Although it is shown in the state with the clearance gap between them, the thread Y is actually sandwiched by the convex parts 13a and 13b and the recessed parts 14a and 14b.

After the article 19 is doped and brought into the state of FIG. 4B, the ball bobbin B is inserted into the spindle 1, and the base is restarted after the lappet 21 is rotationally disposed in the winding position. . The end of the seal Y, which is connected to the traveler 20, is gripped between the thread end cutting member 8 and the spindle base 5b until the next doping. Then, the thread end held between the thread end cutting member 8 and the spindle base 5b is connected to the tube 19 during the next doping and is separated from the spindle 1.

This embodiment has the following effects.

(1) As the thread tip cutting member 8 having the cutter portion 10 is raised and lowered together with the tube 19 at the time of doping, the yarn Y connected to the traveler 20 from the tube 19 is The cutter is cut by the cutter section 10 while being gripped between the thread end cutting member 8 and the spindle base 5b. Therefore, unlike the conventional apparatus for winding and holding the thread tip on the spindle 1, the thread tip does not need to be wound several times, so that the thread (thread tip) remaining on the spindle base 5b can be reduced. In addition, the thread tip held between the thread tip cutting member 8 and the spindle base 5b is connected to the tube 19 at the next doping so as to be disengaged from the spindle 1, so that it is not necessary to perform the thread tip removal operation.

(2) The threads Y are provided with a plurality of convex portions 13a, 13b and recesses provided so as to extend in the radial direction at the lower end of the thread end cutting member 8 and the upper end of the spindle base 5b opposite the lower end. It is gripped in the state bent by 14a, 14b). Therefore, even if the force which presses the thread tip cutting member 8 to the spindle base 5b side is small so that it does not interfere with the operation of the doping apparatus 22, holding | gripping of the thread Y is performed reliably. As a result, the complicated operation of the ring rail 18 at the time of doping stop is not necessary, and the thread (thread tip) which remains in the spindle base 5b can be shortened, without disturbing the operation of the doping apparatus 22. FIG.

(3) The lower surface of the convex portion 13a, which is the lower end of the thread cutting member 8, and the lower surface of the recess 14a, respectively, have the spindle 1 as the rotation center and the vertex including the outer periphery of the lower end of the spindle ( It is formed to constitute a part of the inclined surface of the virtual cone located above the surface orthogonal to 1). When a force in the direction in which the thread is pulled out from the gripping portion acts on the yarn Y in a state in which the spindle 1 is wound within 1 turn, a force in the radial direction and outward acts on the yarn Y. When the lower surface of the convex portion 13a serving as the gripping surface and the bottom surface of the concave portion 14a are inclined downward, the convex portion 13a and the concave portion are compared with the case where the yarn Y is held in the horizontal plane. The resistance applied to the thread Y at the edge of the 14a becomes large, and the thread becomes difficult to be pulled out. As a result, the pressing force of the thread end cutting member 8 required for the holding of the thread Y is horizontal, and It can be made small in comparison.

(4) The center adjusting means which ensures concentricity with respect to the spindle base 5b of the thread end cutting member 8 is provided. Therefore, since the thread cutting member 8 is rotated concentrically with the spindle 1 by the action of the center adjusting means, vibration is less likely to occur during rotation, and it can rotate stably even at high speed rotation.

(5) The center adjusting means is provided at a position where the thread cutting member 8 and the spindle base 5b face each other, and an end surface 15 constituting an inclined surface of the virtual cone with the spindle 1 as the rotation center; The curved surface 16a is provided. Thus, when the doped end cutting member 8, which is displaced from the spindle base 5b at the time of doping and moved above the spindle base 5b, is lowered and engaged with the spindle base 5b again, the end face 15 and the curved surface By engaging 16a, the center is adjusted so that the thread cutting member 8 is coaxial with the spindle 1. In addition, there is no need to secure a special space for installing the central control means.

(6) The spindle base 5b is made of resin, and the portion engaged with the spindle base 5b of the thread end cutting member 8 is made of metal. In the case where both the spindle base 5b and the thread tip cutting member 8 are made of metal, the thread tip cutting member 8 is separated from the threaded yarn 19 and lowered (falling), and the thread (between the spindle base 5b) When the thread is thin when holding Y), the thread Y may be cut at the end of the gripping portion due to the impact sandwiched between the gripping portions. However, since the spindle base 5b is made of resin, the thread Y can be prevented from being cut at the end of the gripping portion due to the impact of the gripping even when the thread is thin.

(7) Since the thread tip cutting member 8 is always elastic to the spindle base 5b side by the coil spring 11, even if the thread tip cutting member 8 is light, the thread Y connected to the traveler 20 is kept. It can be grasped securely. In addition, since the thread tip cutting member 8 is elastically moved downward by the coil spring 11 when the bobbin fitting portion 9 is detached from the bobbin B, the thread Y is dropped during the drop of the thread tip cutting member 8. Even if it is cut | disconnected, the thread end cutting member 8 can reach the position which contacts the spindle base 5b quickly, and can hold | grip the yarn Y.

(8) The bobbin fitting portion 9 is provided with a fitting force increasing means (rubber ring 17) for improving the fitting force with the bobbin B. Therefore, the thread end cutting member can be raised to the predetermined height with the tube 19 against the elastic force of the coil spring 11 reliably.

Embodiment is not limited to the above, For example, you may actualize as follows.

◇ The center adjusting means is provided on the thread end cutting member 8 side, and has a wall 16 having a curved surface 16a constituting the inclined surface of the virtual cone with the spindle as the center of rotation, and a convex on the spindle base 5b side. It is not limited to the combination of the end surface 15 of the part 13b. For example, as shown in FIG. 5, on the outer circumferential side of the recess 14b formed in the spindle base 5b, a wall having a curved surface 23a constituting the inclined surface of the downward virtual cone with the spindle 1 as the rotation center. 23 is formed. And the outer peripheral side end surface of the convex part 13a of the thread end cutting member 8 can contact the curved surface 23a, and is formed in the shape which comprises the inclined surface of the virtual cone which made the spindle 1 the rotation center.

◇ The center adjusting means moves the thread end cutting member 8 to the spindle base when the thread end cutting member 8 rises to a position where it is disengaged from the spindle base 5b, and then moves downward to a position engaged with the spindle base 5b. 5b) may be arranged concentrically, and it is not necessary to provide a portion constituting the inclined surface of the virtual cone having the spindle 1 as the rotation center. For example, a plurality of tapered inclined surfaces may be provided at positions facing the thread end cutting member 8 and the spindle base 5b. In addition, a convex portion or a concave portion may be formed on a part of the bottoms of the concave portions 14a and 14b, and a concave portion or convex portion fitted to the convex portion or the concave portion may be formed on the convex portions 13a and 13b.

-The convex parts 13a and 13b and the recessed parts 14a and 14b are not limited to square shape, but the cross-sectional shape formed by the cut surface orthogonal to the radial direction may be triangular shape, or other shape.

-Convex part 13a, 13b and recessed part 14a, 14b are not limited to the structure extended in radial direction (radial shape), For example, you may form so that it may mutually extend in parallel.

-Convex part 13a, 13b and recessed part 14a, 14b can also be made into the annular shape centering on the spindle 1. As shown in FIG. In this case, the center adjusting means is formed by forming the tip ends of the convex portions 13a and 13b into a tapered shape having a tapered shape, or by forming the opening ends of the concave portions 14a and 14b into a tapered shape having a wider width at the end portions. It can be combined.

The spindle base 5b may be made of metal, and the thread cutting member 8 may be made of resin except for the blade body 10a. Also in this case, even if the thread Y is thin, it is prevented that the thread Y is cut | disconnected at the time of holding. Further, both the spindle base 5b and the thread cutting member 8 may be made of metal.

◇ A magnet (magnet) may be used in place of the spring as the elastic means for elastically tightening the thread cutting member 8 to the spindle base 5b in a state where the thread cutting member 8 is in contact with the spindle base 5b. For example, a magnet is embedded in the upper surface of the spindle base 5b, and a magnetic material (for example, iron) is fixed to the lower surface of the bottom of the thread cutting member 8. Magnets may be provided on both sides of the spindle base 5b and the thread end cutting member 8, or magnets may be provided on the thread end cutting member 8 side and magnetic materials on the spindle base 5b side. In this case, what is necessary is just to fix the retaining ring or pin as a stopper to the predetermined position of the blade 5a as a restriction means which regulates the raise of the thread tip cutting member 8. As shown in FIG. The thread end cutting member 8 is detached from the yarn 19 by abutting the retaining ring or the pin while being raised together with the yarn 19.

In the configuration in which the coil spring 11 is not provided, instead of forming the concave portion 9a in the bobbin fitting portion 9, a slit extending in the circumferential direction or forming a guide groove extending in the axial direction or extending in the axial direction is provided. Form. On the other hand, an engaging convex portion (e.g., a pin) engaged with the guide groove or the slit is provided in the blade 5a. In this case, when the thread tip cutting member 8 is detached from the tube 19, it is reliably directly below. Descends.

◇ The front end surfaces of the convex portions 13a and 13b and the bottom surfaces of the concave portions 14a and 14b are not limited to the shape inclined downward toward the outside but may be horizontal. However, when the pulled-out force of the gripped thread Y acts, the downwardly inclined shape becomes more resistant to pulling the thread out, making it difficult to pull out the thread.

The fitting force increasing means is not limited to the rubber ring 17, and a plate-like or linear spring member may be used. The spring material is not limited to the complete ring shape, but may be a ring shape in which a portion is notched. Further, the spring member may be accommodated in the concave portion formed on the outer surface of the bobbin fitting portion 9 such that the arc portion protrudes. In addition, a button elasticized by a spring can be provided.

The cutter part 10 is not limited to the structure which fixes the blade body 10a of a separate body by the latching convex part 10b, The blade part 10 can also form a blade part integrally. The shape of the blade portion is not limited to a circular shape, and may be a sawtooth shape, for example.

◇ The outer diameter of the cutter part 10 can also be made smaller than the outer diameter of the bottom part of the bobbin B. In this case, there is no fear that the yarn Y, which is connected to the traveler 20 from the tube 19 at the time of doping, is cut before being gripped between the thread end cutting member 8 and the spindle base 5b.

The drive method of the spindle 1 is not limited to the belt drive, and may be a so-called button drive method in which a motor is provided for each weight.

The invention (technical idea) which can be grasped by the said embodiment is described below.

(1) In the invention according to claim 1, the restricting means also serves as an elastic means for elastically retracting the thread end cutting member toward the spindle base side while the thread end cutting member is in contact with the spindle base side.

As described in detail above, according to the inventions of claims 1 to 6, the complicated operation of the ring rail is not necessary at the time of the doping stop, and thus the yarn (thread tip) remaining on the spindle base is not caused to interfere with the operation of the doping apparatus. You can shorten it.

Claims (13)

It is a thread end cutting device in the spinning machine in which the winding of the thread is automatically performed at the expected restart after the ball bobbin is inserted into the spindle which is pulled out by the doping apparatus. A blade extending upwardly from the spindle base, It is provided so as to be able to lift and lower on the blade, and a bobbin fitting portion into which the bobbin is fitted, and a cutter portion provided below the bobbin fitting portion, and the lower end portion is in contact with the spindle base and is interposed between the spindle bases. Thread end cutting member that can hold the thread end, A plurality of convex portions and concave portions provided at an upper end portion of the thread end cutting member and an upper end portion of the spindle base opposite the lower end portion and engaged with each other; A thread tip cutting device in a spinning machine provided between the thread tip cutting member and the blade, and having a restricting means for regulating that the thread tip cutting member is raised to a predetermined height or more from a position in contact with the spindle base when doping. The thread end cutting device according to claim 1, wherein the plurality of convex portions and the concave portions are provided to extend in the radial direction. The lower end portion of the thread cutting member according to claim 1 or 2, wherein the lower end portion of the thread end cutting member forms a part of the inclined surface of the virtual cone which has the spindle as the center of rotation and the vertex includes the outer periphery of the lower end portion, and is located above the plane orthogonal to the spindle. Thread end cutting device in the spinning machine formed. The thread cutting device according to claim 1 or 2, further comprising a center adjusting means for securing concentricity with respect to the spindle base of the thread cutting member. 5. The thread tip of a spinning machine according to claim 4, wherein the center adjusting means is provided at a position where the thread tip cutting member and the spindle base face each other, and have a curved surface constituting an inclined surface of a virtual cone having the spindle as the center of rotation. Cutting device. The thread tip cutting device in a spinning machine according to claim 1 or 2, wherein one of the portions engaged with the spindle base and the spindle base of the thread cutting member is made of metal and the other made of resin. 4. The thread tip cutting device according to claim 3, further comprising a center adjusting means for securing concentricity with respect to the spindle base of the thread tip cutting member. 8. The thread tip of the spinning machine according to claim 7, wherein the center adjusting means is provided at a position where the thread end cutting member and the spindle base face each other, and have a curved surface constituting an inclined surface of a virtual cone having the spindle as the center of rotation. Cutting device. 4. The thread tip cutting device according to claim 3, wherein one of the portions engaged with the spindle base and the spindle base of the thread tip cutting member is made of metal and the other made of resin. 5. The thread tip cutting device according to claim 4, wherein one of the portions engaged with the spindle base and the spindle base of the thread tip cutting member is made of metal and the other made of resin. 6. The thread tip cutting device in a spinning machine according to claim 5, wherein one of the portions engaged with the spindle base and the spindle base of the thread tip cutting member is made of metal and the other made of resin. 8. The thread tip cutting device according to claim 7, wherein one of the portions engaged with the spindle base and the spindle base of the thread tip cutting member is made of metal and the other made of resin. 9. The thread tip cutting device according to claim 8, wherein one of the portions engaged with the spindle base and the spindle base of the thread cutting member is made of metal and the other made of resin.