JP3420548B2 - Vertical full rotation kettle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full rotary hook provided in, for example, a lockstitch sewing machine.

[0002]

2. Description of the Related Art FIG. 9 is a perspective view showing the appearance of a typical conventional full vertical rotary hook 1 and FIG. 10 shows an outer rotary hook 2 and an inner rotary hook 3 of the vertical full rotary rotary hook 1 shown in FIG. It is an exploded perspective view shown. The vertical full-rotation rotary hook 1 is supported by being mounted in the outer hook 2 and an outer hook 2 which is rotationally driven in a direction of an arrow B around a rotation axis L2 perpendicular to the axis L1 of the needle 4 which is reciprocally moved up and down. The inner hook 3 includes a bobbin case 5, a bobbin case 5 that is detachably mounted in the inner hook 3, and a bobbin 6 that is mounted in the bobbin case 5 and around which a bobbin thread is wound.

The outer hook 2 has a sword tip 8 for catching the needle thread 7 inserted through the needle 4, and a rail groove 9 extending in the circumferential direction on the inner peripheral portion.
Is formed, a bottom wall 11 that is continuous with one end portion in the axial direction of the peripheral wall 10 and extends along a virtual plane perpendicular to the axis, and integrally projects from the bottom wall 11 to the opposite side of the peripheral wall 10. Which is formed in a simple manner, the bolt 13 is attached to the lower shaft 12 of the sewing machine.
And a boss 14 which is positioned and fixed in the circumferential direction. A notch 15 is formed in the peripheral wall 10 in a region where the needle 4 which is reciprocated up and down is inserted and interferes with the needle 4, and the notch 15 allows the rail groove 9 to be surrounded. It is divided into directions.

The inner hook 3 has a peripheral wall 19 on which a rail 18 is formed on an outer peripheral portion, a bottom wall 20 which is vertically connected to one end of the peripheral wall 19 in the axial direction, and a radial outer side from the other end of the peripheral wall 19 in the axial direction. And the bottom wall 20 and the outwardly facing flange 21 projecting to and connecting with the bottom wall 20.
The stud 2 is erected vertically toward the opening end in the center of the
2 and. The rail 18 extends in the circumferential direction at a substantially central position of the circumferential wall 19 in the axial direction, and is cut out in the region in which the needle 4 is inserted and divided in the circumferential direction. The rail 18 extends from the yarn splitting portion 28 at the upstream end of the outer hook rotating direction to the yarn pull-out portion 29 at the downstream end of the outer hook rotating direction.
The outward facing flange 21 is formed with a rotary hook stopping recess 23, and the protrusion 25 of the rotary hook stopping member 24 fixed to the machine body of the sewing machine is fitted into the rotary hook stopping recess 23 to rotate the outer rotary hook 2. Accordingly, the inner hook 3 is prevented from rotating in the same direction.

With the rail 18 of the inner rotary hook 3 fitted in the rail groove 9 of the outer rotary hook 2, the outer rotary hook 2 rotates around the rotation axis L2 in the arrow B direction at a high speed of about 5000 min ^-1 (5000 rpm). Driven and synchronized with rotation of outer hook 2 needle 4
Are reciprocated up and down along the axis L1. The needle thread 7 brought by the needle 4 is captured by the sword tip 8,
As the outer hook 2 rotates, the needle thread loop is expanded along the outer surface of the inner hook 3 while passing over the thread, and the bobbin thread drawn out from the bobbin 6 is wound around and pulled up by a lifting operation of a balance (not shown). In this way, the vertical full rotary hook 1 is configured to be able to sew an object to be sewn on the needle plate.

[0006]

The rail 18 of the inner hook 3 is fitted into the rail groove 9 of the outer hook 2, and the inner hook 3 is fixed to the outer hook 2.
The inner hook 3 is mounted inside, and at this time, the inner hook 3 is supported by the innermost surface facing the groove 9 at the lowermost portion 26 of the rail 18.
In this manner, the center of gravity of the inner hook 3 is closer to the inner hook open end side than the lowermost portion 26 supported by the outer hook 2 in the state where the inner hook 3 is mounted inside the outer hook 2. Therefore, a moment is applied to the inner rotary hook 3 such that the upper portion of the inner rotary hook 3 is rotated toward the open end side of the inner rotary hook 3 with the support position which is the lowermost portion 26 as a fulcrum. Especially when the bobbin case 5 in which the bobbin 6 is housed in the inner hook 3 is mounted, the center of gravity of the combination of the inner hook 3, the bobbin case 5 and the bobbin 6 is larger than the center of gravity of the inner hook 3 alone. It is located on the side, and the aforementioned moment becomes large.

Further, as described above, the outer hook 2 has the rotation axis L.
It is rotated around 2 in the direction of arrow B at a high speed of about 5000 min ^-1 . At this time, the inner rotary hook 3 has the rotary hook stopper recess 2
A portion of the outer hook 2 facing from the upstream side in the rotation direction B is supported by the protrusion 25 of the hook stopper member 24, and rotation of the outer hook 2 in the outer hook 2 rotation direction B is prevented. . The hook stopping recess 23 is formed at the end of the inner hook 3 on the open end side, and the inner hook 3 is locked on the open end side to rotate due to sliding friction between the rail 18 and the portion facing the rail groove 9. Is blocked. Therefore, the inner rotary hook 3 is located on the left side of a vertical virtual plane including the axis of the inner rotary hook 3 when the inner rotary hook 3 is viewed from the open end side with the supporting position supported by the convex portion 25 of the rotary hook stopping member 24 as a fulcrum. The moment of rotating the portion of (1) toward the open end side of the inner hook 3 acts.

The rail groove 9 is divided in the circumferential direction at the notch 15 of the outer hook 2, and the rail 18 is formed by the thread dividing portion 2
8 and the yarn pull-out portion 29 are divided in the circumferential direction.
In addition to the track groove 9 and the track being separated in this way, the above-described moment acts on the inner hook 3, so that the area where the track 18 is divided is removed from the outer hook as shown in FIG. When the two notches 15 move, the rail 18
The yarn splitting portion 28 of the above shifts and projects toward the open end side of the inner hook 3 from the movement path 30 of the rail groove 9 shown by the two-dot chain line. Therefore, the outer hook 2 is rotated at a high speed, and the thread separating unit 2
When 8 is once exposed from the groove 9 by the notch 15 and then re-enters the groove 9 from the opening 17, the yarn splitting portion 28 collides with the portion 27 of the peripheral wall 10 of the outer hook 2 due to the aforementioned deviation. Such a collision causes a problem that a loud bite noise is generated.

Therefore, an object of the present invention is to provide a vertical full rotary hook which can prevent the yarn splitting portion of the inner hook from colliding with the downstream side end of the peripheral wall of the outer hook in the outer hook rotational direction during rotation of the outer hook. It is to be.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided a rail extending in the circumferential direction on an inner peripheral portion of a peripheral wall which is notched in an area where a needle which is driven to rotate about a substantially horizontal rotational axis and which is vertically reciprocated is inserted. An outer hook in which the groove is formed, and a rail extending in the circumferential direction from the thread dividing portion to the thread pulling portion are formed on the outer peripheral portion of the peripheral wall,
In a vertical full rotary hook having an inner hook supported by the outer hook in a state where this rail is fitted in the outer hook rail groove and is prevented from rotating, an upstream end portion in the outer hook rotation direction of the outer hook rail groove There is a vertical full rotation characterized in that a magnetic force generating portion for generating a magnetic force for displacing the inner shuttle to the bottom wall side is formed only in the vicinity and / or only near the thread dividing portion of the inner hook rail.

According to the present invention, a magnetic force for generating a magnetic force for displacing the inner hook to the bottom wall side is provided only near the end of the outer groove on the upstream side in the outer hook rotation direction and / or near the thread dividing portion of the rail. A generator is formed. As a result, when the inner hook rail is fitted into the outer hook rail groove, and the outer hook is driven to rotate with the inner hook stopped, the thread separating part of the rail will move in the outer hook rotation direction of the groove. In the vicinity of the upstream end, it is displaced to the bottom wall side of the inner hook just before being placed in the divided portion of the rail groove. Therefore, when the yarn splitting portion passes through the divided portion of the rail groove and enters from the opening on the downstream side in the outer hook rotary direction of the rail groove, the thread splitting portion is the downstream end of the peripheral wall of the outer hook in the outer rotary hook rotation direction. Can be prevented from colliding with the outer hook without disturbing the rotation of the outer hook. As a result, it is possible to prevent the generation of a loud sickle noise due to a collision that occurs in the conventional technique.

Further, according to the present invention, a rail groove extending in the circumferential direction is formed in the inner peripheral portion of the peripheral wall cut out in the region where the needle reciprocally moved up and down and rotated around a substantially horizontal rotation axis. An outer hook and a rail extending in the circumferential direction from the thread splitting portion to the thread pull-out portion are formed on the outer peripheral portion of the peripheral wall. The rail is supported by the outer hook in a state in which it is fitted in a rail groove of the outer hook and prevented from rotating. In a vertical full-rotation rotary hook having an inner hook, a magnetic pole is formed only at an end of a peripheral wall of the outer hook on an upstream side in the outer hook rotation direction, and a magnetic pole is formed in a portion facing the rail groove from the bottom wall side of the outer hook. At least a portion of the rail threading portion on the bottom wall side of the inner hook has a vertical full rotation characterized by being made of a ferromagnetic material.

According to the present invention, the magnetic pole is formed only in the portion of the peripheral wall of the outer hook on the upstream side in the outer hook rotational direction from the outer hook bottom wall side to the rail groove, and the thread of the inner hook rail is divided. At least the portion on the inner wall side of the inner hook is made of a ferromagnetic material.
With this, when the inner hook rail is fitted into the outer hook rail groove and the outer hook is rotationally driven with the inner hook stopped, at least the inner hook bottom wall side of the thread dividing portion of the rail is The portion is attracted to the bottom wall side of the inner hook by the magnetic pole in the vicinity of the upstream end in the outer hook rotation direction of the rail groove. Therefore, the yarn splitting portion of the rail is displaced to the bottom wall side of the inner hook just before being arranged in the divided portion of the rail groove. As a result, when the thread splitting portion passes through the divided portion of the rail groove and enters from the opening on the downstream side in the outer hook rotary direction of the rail groove, the thread splitting portion is the downstream end of the peripheral wall of the outer rotary hook in the outer rotary hook rotation direction. It is possible to prevent the collision with the part without disturbing the rotation of the outer hook. Therefore, it is possible to prevent the generation of a loud beak sound due to a collision that occurs in the conventional technique.

Further, according to the present invention, a track groove extending in the circumferential direction is formed in the inner peripheral portion of the peripheral wall, which is cut in the area where the needle reciprocally moved up and down and rotated about a substantially horizontal axis of rotation is inserted. An outer hook and a rail extending in the circumferential direction from the thread splitting portion to the thread pull-out portion are formed on the outer peripheral portion of the peripheral wall. The rail is supported by the outer hook in a state in which it is fitted in a rail groove of the outer hook and prevented from rotating. In a vertical full rotary hook having an inner hook, a magnetic pole is formed only at an end of the peripheral wall of the outer hook on the upstream side in the outer hook rotation direction, at a portion facing the rail groove from the open end side of the outer hook. The vertical full rotation is characterized in that the magnetic pole having the same polarity as that of the magnetic pole formed on the outer hook is formed only on the thread separating portion of the rail at the open end side portion of the inner hook.

According to the present invention, only the portion of the full rotary hook having the outer hook and the inner hook facing the rail groove from the outer hook open end side of the end of the peripheral wall of the outer hook on the upstream side in the outer hook rotation direction. Magnetic poles are formed, and magnetic poles having the same polarity as those of the magnetic poles formed on the outer hook are formed only on the inner hook open end side of the thread splitting portion of the inner hook rail. As a result, when the inner hook rail is fitted into the outer hook rail groove, and the outer hook is driven to rotate with the inner hook stopped, the outer hook rotation direction upstream side of the peripheral wall of the outer hook In the vicinity of the end, the magnetic pole formed in the portion facing the track groove from the outer hook open end side and the magnetic pole formed in the inner hook open end side of the thread dividing portion repel each other. Therefore, the thread dividing part of the rail is
Immediately before being placed in the divided part of the track groove, it is displaced to the bottom wall side of the inner hook. As a result, when the thread splitting portion passes through the divided portion of the rail groove and enters from the opening on the downstream side in the outer hook rotary direction of the rail groove, the thread splitting portion is the downstream end of the peripheral wall of the outer rotary hook in the outer rotary hook rotation direction. It is possible to prevent the collision with the part without disturbing the rotation of the outer hook. Therefore, it is possible to prevent the generation of a loud beak sound due to a collision that occurs in the conventional technique.

[0016]

FIG. 1 is a sectional view showing the overall construction of a vertical full-rotation rotary hook 51 according to an embodiment of the present invention, and FIG. 2 shows an external view of the vertical full-rotation rotary hook 51 shown in FIG. FIG. 3 is a perspective view showing the vertical full rotary hook 51 shown in FIG.
It is an exploded perspective view showing the state where bobbin case 54 and bobbin 55 were removed from inner hook 53. 1 shows a state in which the end 71 of the peripheral wall 80 of the outer hook 52 on the upstream side of the outer hook rotating direction A as shown in FIG. 2 is arranged in the vicinity of the thread dividing portion 77 of the rail 59. The cross section seen from the cutting plane line I-I which passes along the rotation axis L3 of the division part 77 and the outer hook 52 is shown. Vertical full rotary hook 5 provided on the lockstitch sewing machine
Reference numeral 1 denotes an outer hook 52 which is rotationally driven in a direction of an arrow A around a substantially horizontal (including horizontal) rotation axis L3, and an inner hook 53 which is supported by being partially fitted in the outer hook 52. A bobbin case 54 detachably mounted in the inner hook 53,
A bobbin 55 is contained in the bobbin case 54 and around which a bobbin thread 57 is wound.

The outer hook 52 extends around the rotation axis L3 and has a peripheral wall 80 having a rail groove 58 formed on the inner peripheral portion thereof, and an axially one end portion of the peripheral wall 80 extending in a virtual plane perpendicular to the axis. A bottom wall 81 extending along the same, and a boss 84 which is integrally formed so as to project from the bottom wall 81 to the side opposite to the peripheral wall 80 and is circumferentially positioned and fixed to the lower shaft 83 of the sewing machine by a bolt (not shown). Have. The axis of the lower shaft 83 coincides with the rotation axis L3 of the outer hook 52. Rotational force is transmitted from the lower shaft 83 to the outer hook 52, and the outer hook 52 is rotationally driven in the arrow A direction around the rotation axis L3. Further, the outer hook 52 has a sword tip 56 on the peripheral wall 80, and a needle thread 151 provided by a needle 150 that is reciprocated in synchronization with the outer hook 53 up and down along an axis L4 perpendicular to the axis L3.
Capture with a sword tip to form a needle thread loop.

A cutout 73 is formed in the peripheral wall 80 of the outer hook 52 in a region where the needle 150 is inserted. This notch 73
By this, mutual interference between the outer hook 52 and the needle 150 can be avoided. The rail groove 58 is formed on the inner peripheral portion of the peripheral wall 80 so as to extend in the peripheral direction along a virtual plane that is perpendicular to the axis L3 of the peripheral wall 80, and is divided by the notch 73 in the peripheral direction. The sword tip 56 has a peripheral wall 80 that is cut out in this way.
It is formed at the downstream end of the outer hook rotary shaft direction A.

The peripheral wall 80 has an outer hook rotary direction A of the peripheral wall 80.
The upstream side portion has an inner hook presser 65 over a region of about 180 degrees. The inner hook holder 65 is detachable from the peripheral wall body 80a, which is the remaining portion of the peripheral wall 80, and is attached to the peripheral wall body 80a.
8 from the open end side of the outer hook 52. In other words, the inner surface of the peripheral wall 80 facing the rail groove 58 from the outer hook open end side is formed by the inner hook presser 65 in a region of about 180 degrees upstream of the outer hook rotation direction A.

The inner hook 53 is provided with a peripheral wall 60 having a rail 59 formed on the outer peripheral portion thereof, a bottom wall 61 connected to one end portion of the peripheral wall 60 in the axial direction, and a bottom wall 61 standing upright toward the open end side of the peripheral wall 60. The stud 62 is provided, and the outward flange 63 is connected to the other end of the peripheral wall 60 in the axial direction on the open end side. The rail 59 is formed so as to extend in the circumferential direction along an imaginary plane perpendicular to the axis of the peripheral wall 60. Rail 59 is needle 150
Is notched in the region where the is inserted and is divided in the circumferential direction. Therefore, the rail 59 is divided at the upper part in a state where the inner hook 53 is attached to the outer hook 52, and the rail 59 is pulled out from the thread splitting portion 77 at the end on the upstream side in the outer hook rotation direction A to the thread on the downstream side in the outer hook rotation direction A. It is formed to extend over the portion 75. This rail 59
Is the bottom wall 6 of at least the inner rotary hook 53 of the thread dividing portion 77.
The portion 88 on the first side is made of a ferromagnetic material such as iron. In the present embodiment, the entire inner hook 53 is made of iron.
The inner hook 53 has the axis 59 of the peripheral wall 60 of the inner hook 53 aligned or substantially matched with the rotation axis L3 of the outer hook 52 with the rail 59 fitted in the groove 58 of the outer hook 52. Mounted inside and supported at the bottom to the rail.

A protrusion 153 of a hook stopper member 152, whose base end is fixed to the machine body of the sewing machine, is fitted into the outward flange 63 at a position where it becomes an upper portion while being supported by an outside hook. The location 66 is formed. This bite stop recess 6
When the protrusion 153 of the hook stopping member 152 is fitted in 6, the outer hook 52 is coaxially fixed to the boss 84 at the time of sewing by the lower shaft 83 around the rotation axis L3 in the arrow A direction, for example, 5000 min ^−1. Even if the inner hook 53 is driven to rotate at a high speed, it is prevented that the inner hook 53 rotates due to sliding friction between the rail 59 and a portion of the outer hook 52 facing the rail groove 58.

The bobbin case 54 is formed into a bottomed cylinder whose one side in the axial direction is open. The bobbin case 54 has a substantially cylindrical outer peripheral tubular portion 68 and a lid portion 69 that closes one end of the outer peripheral tubular portion 68 in the axial direction. The lid portion 69 is formed with a central tubular portion 70 that coaxially projects with the outer peripheral tubular portion 68.

The bobbin 55 has a cylindrical body 83 having a central hole 82 and a pair of outwardly facing flanges 84 and 85 integrally formed at both axial ends of the cylindrical body 83.
Have and. As described above, the bobbin 55 has a bobbin thread 57.
Is wound and stored in the bobbin case 54, and in this state, the bobbin case 54 is mounted on the inner hook 53. At this time, the central tubular portion 70 of the bobbin case 54 is inserted into the central hole 82 of the bobbin 55, and the stud 62 provided upright on the bottom portion 61 of the inner rotary hook 3 is inserted into the central tubular portion 70.

Such a vertical full-turn rotary hook 51 has a needle 15
When the sword tip 56 catches the needle thread 151 brought by 0 and the outer hook 52 further rotates from this state, the inner hook 53 is passed over the loop of the caught needle thread 151 and is attached to the inner hook 53. Bobbin case 54
The needle thread 15 to the bobbin thread 57 pulled out from the inner bobbin 55.
Can be wound around 1. In this state, the needle thread 151 is pulled up by the raising operation of the balance (not shown),
The sewing machine is configured to be able to sew an object to be sewn on a needle plate (not shown).

FIG. 4 is an enlarged sectional view showing the section IV of FIG. 1, and FIG. 5 is a front view showing the outer hook 52 shown in FIG. It should be noted that FIG. 4 shows the end portion 7 of the outer hook 52 in a state in which the upstream end 71 of the outer hook 52 in the rotation direction A rotation direction A is arranged near the thread dividing portion 77 of the rail 59.
1, a cross section taken along a cutting plane line passing through the rotation axis L3 of the yarn splitting portion 77 and the outer hook 52 is shown. As shown in FIG. 4 and FIG. 5, the end portion 71 of the peripheral wall body 80a of the peripheral wall 80 of the outer rotary hook 52 on the upstream side in the outer rotary hook rotational direction A faces the track groove 58 from the bottom wall 81 side of the outer rotary hook 52. The magnetic force generator 8 is provided on the portion 76.
7 is formed.

The magnetic force generating portion 87 is formed with a magnetic pole 67a facing the rail groove 58. The magnetic pole 67a is provided by providing a permanent magnet piece such as a ferrite magnet 155,
This is realized by the magnetic poles of the permanent magnet pieces. More specifically, the outer hook 52 of the end 71 of the peripheral wall body 80a described above.
A cylindrical recess 74 is formed in a portion 76 facing the rail groove 58 from the bottom wall 81 side, and the opening is facing the rail groove 58.
The recess 74 is formed, for example, by drilling so that its axial direction is parallel to the rotation axis L3 of the outer hook 52 described above. A short cylindrical permanent magnet piece is fitted into the recess 74. The permanent magnet piece has a magnetic pole 67a at one end in the axial direction and a magnetic pole 67b having a polarity different from that of the magnetic pole 67a at the other end in the axial direction.
Such a permanent magnet piece is fitted into the recess 74 so that its axial direction substantially coincides with the axial direction of the recess 74 and one magnetic pole 67 a is arranged on the opening side of the recess 74.
In the present embodiment, for example, an N pole is selected as the magnetic pole 67a arranged on the opening side of the recess 74. The vicinity of the recess 74 of the outer hook 52, and in the present embodiment, the outer hook 52 is made of a ferromagnetic material such as iron.

When the permanent magnet piece 155 is arranged so as to face the rail 59, the magnetic pole generating portion 87 has a permanent magnet piece 155.
All of the magnetic lines of force from the magnetic pole 67a to the magnetic pole 67b outside the above are formed so as to pass through the rail 59 once and then through the region R where the rail 59 and the portion 76 facing the rail groove 58 face each other. In other words, the rotation axis L3 and the recess 74
The straight line distances D1 and D2 of the facing region R in the virtual one plane including the axis of
After passing the rail 59, the distance that can be passed is selected.
The facing region R is a portion where the end face of the inner hook 53 on the bottom wall 61 side of the rail 59 and the end face of the outer hook 52 on the open end side of the portion 76 are in contact with each other. The distance D1 is
In FIG. 4, a straight line between the outer peripheral surface 59a of the rail 59 and the inner peripheral surface 74a of the recess 74 at a position closest to the outermost bite outer periphery, in a virtual one plane including the rotation axis L3 and the axis of the recess 74. Equivalent to distance. Further, the distance D2 corresponds to a straight line distance within a virtual one plane including the rotation axis L3 and the axis of the recess 74, of a portion 78 of the end portion 71 that faces the recess 74 from the inner side in the radial direction. To do. In the facing area R, the smallest linear distance is the distance D.
1 or D2 and the distances D1 and D2 are selected as described above, the magnetic force generating portion 87 is provided so as not to generate magnetic force lines that do not pass through the facing region R. Therefore, the magnetic force generated by the magnetic force generator 87 only attracts the rail to the bottom side of the outer hook 52, and does not generate a force that displaces the inner hook 53 in the radial direction.

Further, the distance D2 is equal to that of the end portion 71,
A portion 78 that faces the recess 74 from the radially inner side of the outer hook 52.
However, it is also selected so as to have a thickness that has a strength to prevent deformation during the drilling process for forming the recess 74.

The permanent magnet piece has a distance D3 between the opening end of the recess 74 and the end face of the opening side magnetic pole 67a.
Are provided in the recess 74 so as to have

The peripheral wall body 8 of the outer rotary hook 52 of the vertical full rotation rotary hook 51 having the outer rotary hook 52 and the inner rotary hook 53 as described above.
0a of the outer hook 52 in the rotation direction A upstream side of the outer hook 52 from the bottom wall 81 side of the outer hook 52 to the portion 76 facing the rail groove 58.
The magnetic force generating portion 87 having 7a is formed and the inner hook 5
At least a portion of the thread splitting portion 77 of the third rail 59 on the bottom wall 61 side of the inner hook 53 is made of a ferromagnetic material. As a result, the rail 59 of the inner hook 53 fits into the rail groove 58 of the outer hook 52, and the outer hook 5 is locked while the inner hook 53 is prevented from rotating.
2 is rotationally driven in the direction of arrow A about the rotation axis L3,
When the vicinity of the upstream end 71 of the outer hook 52 of the rail groove 58 in the rotation direction A is arranged near the thread dividing portion 77 of the rail 59, the thread dividing portion 77 is moved to the bottom wall 6 of the inner hook 53 by the magnetic pole 67a.
It is sucked to the 1 side. As a result, the thread splitting portion 77 of the rail 59 is provided with a notch 73 which is a divided portion of the rail groove 58.
Immediately before being placed inside, the inner hook 53 is displaced toward the bottom wall 61 side. As a result, when supported at the lowermost portion, which is approximately the center of the thread separating portion and the thread pulling portion, the center of gravity of the inner hook, the bobbin case, and the combination of the bobbin is located on the open end side of the outer hook and the inner hook. Even if a moment that tilts the upper part toward the open end occurs, the rail 56 always exists in the movement path of the rail groove 58, and the thread splitting portion 77 of the rail groove 56 passes through the notch 73 to pass the rail groove 58. When entering from the opening on the downstream side of the outer hook 52 in the rotation direction A, the thread dividing portion 77 opens the outer hook 52 to the rail groove 58 at the downstream end of the outer wall 52 of the outer hook 52 in the rotation direction A direction. It is possible to prevent the collision from the end side. As a result, it is possible to prevent generation of a large beak sound due to a collision that occurs in the conventional technique, without hindering the rotation of the outer hook 52. Further, it is possible to prevent the problem that the tension of the bobbin thread 57 is varied due to the vibration of the collision, and therefore, the unevenness of thread tightening does not occur,
The sewing quality can be improved.

Further, as described above, in the straight line distances D1 and D2 in the imaginary plane including the rotation axis L3 and the axis of the recess 74 in the facing region R, all the magnetic lines of force from the magnetic pole 67a temporarily have the rail 59. After passing, it is selected as a distance that can pass through the facing region R. As a result, the magnetic force from the magnetic pole 67a is at least the portion 8 on the bottom wall 61 side of the inner hook 53 of the thread splitting portion 77 of the rail 59 made of a ferromagnetic material as described above.
8 acts only on magnetic attraction toward the bottom wall 61 of the inner rotary hook 53. Therefore, it is possible to prevent the inner hook 53 from being sucked in the radial direction, and the inner hook 53 is always supported by the inner peripheral surface facing the groove 58 at only one point under the rail 59, so that the distances D1 and D2 are reduced. It is possible to further reduce the vibration of the inner hook 53, as compared with a configuration in which all the magnetic force lines from the magnetic pole 67a are not selected as a distance that can pass through the facing region R after once passing through the rail 59. . This also prevents the problem that the tension of the bobbin thread 57 varies, prevents uneven thread tightening, and improves the sewing quality.

The permanent magnet piece has a distance D3 between the opening end of the recess 74 and the end face of the opening side magnetic pole 67a.
Are provided in the recess 74 so as to have As a result, the portion 88 of the thread dividing portion 77 on the bottom wall 61 side that is attracted to the bottom wall 61 side of the inner hook 53 by the magnetic pole 67a and the end surface of the magnetic pole 67a on the opening side of the recess 74 of the magnetic force generating portion 87 are separated. It is possible to prevent the end faces of the magnetic poles 67a from being worn by sliding while contacting. This configuration is effective when a permanent magnet piece such as a ferrite magnet that is easily damaged by an external force is used as the magnetic force generator 87.

In the embodiment described above, the recess 7
Although the N pole is selected as the magnetic pole 67a arranged on the opening side of 4, the S pole may be selected as the magnetic pole 67a.
Further, magnetic poles of permanent magnet pieces other than ferrite magnets may be used as the magnetic poles 67a and 67b, and a part of the outer hook 52 may be magnetized instead of the permanent magnet pieces. Further, in the above-described embodiment, the facing region R faces the rail groove 58 from the end face of the inner hook 53 of the rail 59 on the bottom wall 61 side and the bottom wall 81 side of the outer hook 52 of the end 71 of the peripheral wall body 80a. Although it has been shown as a portion in which the outer hook 52 of the portion 76 is in contact with the end surface on the open end side, it may be in a region where the rail 59 and the portion 76 face each other, and may not be in contact with each other. . Further, the distances D1 and D2 are equal to the magnetic pole 67a.
It is not necessary to select such a distance that all the magnetic lines of force from 1 to 4 once pass through the rail 59 and then pass through the facing region R. Further, the inner hook 53 may be made of a ferromagnetic material only in the vicinity of the yarn splitting portion 77 of the rail 59, thereby reducing the area where the rail 59 is attracted by the permanent magnet pieces 155, and providing a large resistance to the rotation of the outer hook. May be prevented.

Further, in the above-described embodiment, the permanent magnet piece has a recess so that a distance D3 is provided between the opening end of the recess 74 and the end face of the magnetic pole 67a arranged on the opening side of the recess 74. However, the distance D3 may not be provided, and the end surface of the magnetic pole 67a and the portion 88 of the rail 59 may be in contact with each other.

FIG. 6 is a sectional view showing the overall structure of a vertical full rotation rotary hook 91 according to another embodiment of the present invention, and FIG. 7 is an enlarged view showing a section VII of FIG. FIG. 7 is a front view showing the inner hook 93 shown in FIG. 6. The vertical full-rotation rotary hook 91 of the present embodiment is the same as that shown in FIGS.
Similar to the vertical full rotation rotary hook 51 of each embodiment shown in FIG. 1, corresponding parts are designated by the same reference numerals, only different configurations will be described, and description of similar configurations will be omitted. 6 is similar to FIG. 1, the end portion 7 of the peripheral wall 80 of the outer hook 52 in the outer hook rotating direction A upstream side end portion 71 is arranged near the thread dividing portion 77 of the rail 59.
FIG. 3 is a cross-sectional view of a plane passing through the rotation axis L3 of the yarn splitting section 77 and the outer hook 52. As shown in FIG. 7 and FIG. 8, the vertical full rotation rotary hook 91 of the present embodiment has an inner rotary hook presser 65 and an external rotary hook which are provided at an end 71 of the outer wall 52 of the outer rotary hook 52 on the upstream side in the outer rotary hook rotation direction A. A permanent magnet piece 104 having magnetic poles 103a and 103b is provided in a portion 102 facing the rail groove 58 from the open end side of 52. Further, in the yarn splitting portion 77 of the rail 59 of the inner rotary hook 53, a permanent magnet piece 107 having magnetic poles 106a and 106b is provided at a portion 105 on the open end side of the inner rotary hook 53. In this vertical full-rotation rotary hook 91, instead of the above-described magnetic force generating section 87, each permanent magnet piece 10 is replaced.
A magnetic force generation unit 140 having 4,107 is formed.

The permanent magnet pieces 104 and 107 made of a ferrite magnet or the like are provided so that the magnetic poles 103a and 106a arranged on the side close to and opposite to each other have the same polarity. More specifically, a cylindrical recess 108 facing the open end side is formed in a portion 102 of the end 71 described above that faces the rail groove 58 from the open end side of the outer hook 52 of the inner hook presser 65. The recess 108 is formed by, for example, drilling so that its axial direction is parallel to the direction along the rotation axis L3 of the outer hook 52 described above. A short columnar permanent magnet piece is fitted into such a recess 108. The permanent magnet piece has a magnetic pole 103a at one end in the axial direction and a magnetic pole 103b having a polarity different from that of the magnetic pole 103a at the other end in the axial direction. In such a permanent magnet piece, the axial direction thereof substantially coincides with the axial direction of the recess 108, and the one magnetic pole 103a has the recess 10 formed therein.
8 is fitted in the recess 108 so as to be arranged on the opening side. In the present embodiment, for example, an N pole is selected as the magnetic pole 103a arranged on the opening side. Also rail 5
The portion 105 of the inner thread hook 53 of the yarn splitting portion 77 of 9 on the open end side
The cylindrical recess 10 facing the bottom wall 61 side of the inner hook 53
9 is formed. The recess 109 has, for example, an axial direction that substantially coincides with the axial direction of the recess 108 described above in a state where the inner hook 53 is supported by the inner peripheral surface facing the rail groove 101 below the rail 59. It is formed by drilling. Such a recess 109 has a magnetic pole 106a at one end in the axial direction and the magnetic pole 1 at the other end in the axial direction.
A short cylindrical permanent magnet piece having a magnetic pole 106b having a polarity different from that of 06a is fitted. The axial direction of such a permanent magnet piece substantially coincides with the axial direction of the recess 109,
In addition, the one magnetic pole 106a is fitted into the recess 109 so as to be arranged on the opening side of the recess 109. In the present embodiment, for example, the N pole is selected as the magnetic pole 106a arranged on the opening side. That is, the peripheral wall 80 of the outer hook 52
In the state where the upstream side end portion 71 of the outer hook in the rotation direction A is arranged near the thread splitting portion 77 of the rail 59, the permanent magnet pieces 104 and 107 formed facing each other have substantially the same axial direction. In addition, the polarities are the same, and in the present embodiment, the N poles face each other. In other words, the axis of the permanent magnet piece 107 is arranged at one position of the movement path of the axis of the permanent magnet piece 104 as the outer hook 52 rotates.

In the permanent magnet piece 104, a portion 111 which faces the recess 108 of the end portion 71 from the inner side in the radial direction of the outer hook,
It is provided so as to have a linear distance D4 in a virtual one plane including the rotation axis L3 and the axis of the recess 108. Further, the permanent magnet piece 1017 is provided with the recess 109 of the rail 59.
A portion 113 of the inner hook facing the outer side in the radial direction is provided so as to have a linear distance D5 in a virtual one plane including the rotation axis L3 and the axis of the recess 109.

The distance D4 corresponds to the recess 10 of the end portion 71.
A portion 111 of the outer hook which faces the inner side in the radial direction of the outer hook is selected so as to have a thickness that has a strength to prevent deformation during drilling for forming the recess 108. Similarly, the distance D5 is set such that the portion 113 of the rail 59, which faces the recess 109 from the outer side in the radial direction of the inner hook, has such strength as to prevent deformation during the drilling process for forming the recess 109. Chosen to be.

The permanent magnet piece 104 is provided in the recess 108 so as to have a distance D6 between the opening end of the recess 108 and the end face of the magnetic pole 103a on the opening side. Similarly, the permanent magnet piece 107 is provided in the recess 109 so as to have a distance D7 between the opening end of the recess 109 and the end of the magnetic pole 106a on the opening side.

As described above, the vertical full rotation rotary hook 91 is provided with the magnetic force generating section 140 having the permanent magnet pieces 104 and 107. The permanent magnet pieces 104 and 107 have magnetic poles 10 whose axial directions are substantially the same and whose polarities are the same.
3a and 106a are arranged to face each other. As a result, the rail 59 of the inner hook 53 fits into the groove 58 of the outer hook 52, and when the outer hook 52 is rotationally driven with the inner hook 53 stopped, the outer hook 52 of the groove 58 is
In the vicinity of the upstream side end 71 of the outer hook rotating direction A of the peripheral wall 80, the magnetic pole 103a formed in a portion facing the rail groove 58 from the outer hook open end side and the inner hook open end side of the thread dividing portion 77 are formed. And the magnetic pole 106a that repels each other. As a result, the yarn splitting portion 77 of the rail 59 is located immediately before the inner hook 53 is placed in the notch 73 which is the divided portion of the rail groove.
Is displaced toward the bottom wall 81 side. As a result, the rail 59 is always present in the moving path of the rail groove 58, and the thread dividing portion 77 of the rail 59 passes through the divided portion of the rail groove 58 to pass the rail groove 58.
When the thread hook portion 77 is inserted from the opening on the downstream side of the outer hook 52 in the rotation direction A, the thread splitting portion 77 is inserted into the rail groove 58 of the downstream end 71 of the outer hook in the outer hook rotation direction A of the outer wall 52 of the outer hook 52. It is possible to prevent the collision with the part facing from. As a result, it is possible to prevent generation of a loud beak sound due to a collision that occurs in the conventional technique, without hindering the rotation of the outer hook 52. Further, it is possible to prevent a problem that the tension of the bobbin thread 57 is varied due to the vibration of the collision, the unevenness of thread tightening does not occur, and the sewing quality can be improved.

Although the magnetic poles 103a and 106a facing each other are both N poles in the above-described embodiment, they may be S poles. Also, the magnetic poles 103a, 103b, 106a,
A magnetic pole of a permanent magnet other than a ferrite magnet may be used as 106b, and instead of the permanent magnet, a portion 105 of the thread dividing portion 77 on the open end side and an end portion 71 of the inner hook presser 65.
The portion 102 facing the rail groove 58 may be magnetized.

A distance D6 may not be provided between the opening end of the recess 108 and the end surface of the magnetic pole 103a on the opening side of the recess 108. Place 1
The distance D7 from the end surface of the magnetic pole 106a on the opening side of 09 may not be provided.

In each of the above-mentioned embodiments, both the outer hook and the inner hook may be made of a ferromagnetic material such as iron or stainless steel. Even in such a case, in the other embodiment described above, when the outer hook 52 is rotated, the end of the inner hook presser 65 on the upstream side in the rotation direction A of the outer hook 52 is arranged near the thread dividing section 77. If the axes of the permanent magnet pieces 104 and 107 are formed so as to be on the same straight line along the substantially horizontal direction, the above-described operation can be reliably achieved. However, the respective axes do not necessarily have to be on the same straight line.

Further, in each of the above-described embodiments, the outer hook and the inner hook are preferably both made of a non-magnetic material. Furthermore, both the outer hook and the inner hook may be formed of a magnetically permeable material. Further, in the vertical full rotary hook 91, the outer hook and the inner hook may be made of a non-magnetic material such as a synthetic resin, which prevents the permanent magnet piece 104 from attracting the inner hook and the permanent magnet piece 107. It is possible to prevent the outer hook from sucking the outer hook, thereby achieving more stable rotation of the outer hook.

[0045]

According to the first aspect of the present invention, the inner hook is provided on the bottom wall side of the rail groove only near the end on the upstream side in the outer hook rotation direction and / or near the thread dividing portion of the rail. A magnetic force generating portion that generates a displacing magnetic force is formed. As a result, when the inner hook rail is fitted into the outer hook rail groove, and the outer hook is driven to rotate with the inner hook stopped, the thread separating part of the rail will move in the outer hook rotation direction of the groove. In the vicinity of the upstream end, it is displaced to the bottom wall side of the inner hook just before being placed in the divided portion of the rail groove. Therefore, when the yarn splitting portion passes through the divided portion of the rail groove and enters from the opening on the downstream side in the outer hook rotary direction of the rail groove, the thread splitting portion is the downstream end of the peripheral wall of the outer hook in the outer rotary hook rotation direction. Can be prevented from colliding with the outer hook without disturbing the rotation of the outer hook.
As a result, it is possible to prevent the generation of a loud sickle noise due to a collision that occurs in the conventional technique.

According to the second aspect of the present invention, the magnetic pole is formed only at the portion of the end of the peripheral wall of the outer hook on the upstream side of the outer hook in the rotational direction of the outer hook from the outer hook bottom wall side, and the inner hook is formed. At least a portion on the inner kettle bottom wall side of the thread dividing portion of the rail is made of a ferromagnetic material. With this, when the inner hook rail is fitted into the outer hook rail groove and the outer hook is rotationally driven with the inner hook stopped, at least the inner hook bottom wall side of the thread dividing portion of the rail is The portion is attracted to the bottom wall side of the inner hook by the magnetic pole in the vicinity of the upstream end in the outer hook rotation direction of the rail groove. Therefore, the yarn splitting portion of the rail is displaced to the bottom wall side of the inner hook just before being arranged in the divided portion of the rail groove. As a result, when the thread splitting portion passes through the divided portion of the rail groove and enters from the opening on the downstream side in the outer hook rotary direction of the rail groove, the thread splitting portion is the downstream end of the peripheral wall of the outer rotary hook in the outer rotary hook rotation direction. It is possible to prevent the collision with the part without disturbing the rotation of the outer hook. Therefore, it is possible to prevent the generation of a loud beak sound due to a collision that occurs in the conventional technique.

According to the third aspect of the present invention, in the full rotary hook having the outer hook and the inner hook, the rail groove from the outer hook open end side of the end of the peripheral wall of the outer hook on the upstream side in the outer hook rotation direction. The magnetic poles are formed only in the portions facing the inner poles, and the magnetic poles having the same polarity as the magnetic poles formed in the outer hooks are formed only in the portions on the inner hook open end side of the thread dividing portion of the inner hook. As a result, when the inner hook rail is fitted into the outer hook rail groove, and the outer hook is driven to rotate with the inner hook stopped, the outer hook rotation direction upstream side of the peripheral wall of the outer hook In the vicinity of the end, the magnetic pole formed in the portion facing the track groove from the outer hook open end side and the magnetic pole formed in the inner hook open end side of the thread dividing portion repel each other. Therefore, the yarn splitting portion of the rail is displaced to the bottom wall side of the inner hook just before being arranged in the divided portion of the rail groove. As a result, when the thread splitting portion passes through the divided portion of the rail groove and enters from the opening on the downstream side in the outer hook rotary direction of the rail groove, the thread splitting portion is the downstream end of the peripheral wall of the outer rotary hook in the outer rotary hook rotation direction. It is possible to prevent the collision with the part without disturbing the rotation of the outer hook.
Therefore, it is possible to prevent the generation of a loud beak sound due to a collision that occurs in the conventional technique.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of a vertical full rotary hook 51 according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an appearance of a vertical full rotation rotary hook 51 of FIG.

3 is an exploded perspective view showing a state in which a bobbin case 54 and a bobbin 55 are removed from an inner rotary hook 53 of the vertical full rotary rotary hook 51 of FIG. 1. FIG.

FIG. 4 is an enlarged cross-sectional view of section IV of FIG.

5 is a front view showing an outer hook 52 of FIG. 1. FIG.

FIG. 6 is a vertical full rotation rotary hook 91 according to another embodiment of the present invention.
FIG. 3 is a cross-sectional view showing the overall configuration of

7 is an enlarged view of section VII of FIG. 6. FIG.

FIG. 8 is a front view showing an inner hook 93 shown in FIG.

FIG. 9 is a perspective view showing the external appearance of a typical conventional full-rotation rotary hook 1.

10 is an exploded perspective view showing an outer hook 2 and an inner hook 3 of the vertical full rotation hook 1 of FIG. 9. FIG.

FIG. 11 is a typical prior art rail 18 thread split 28.
FIG. 6 is a diagram schematically showing a state in which the rail groove 9 enters from an opening 17 on the downstream side of the outer hook 2 rotation direction B.

[Explanation of symbols]

51 Vertical full rotation hook 52 Outer bite 53 Inner Kama 54 bobbin case 55 bobbins 58 tracks 59 rail 67a, 67b magnetic poles 77 Thread division 87 Magnetic force generator

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) D05B 1/00-97/12

Claims (3)

(57) [Claims] 1. An outer hook with a circumferentially extending rail groove formed in an inner peripheral portion of a peripheral wall, which is cut in a region where a needle that is reciprocally moved up and down and is driven to rotate about a substantially horizontal rotation axis is inserted. A rail extending in the circumferential direction is formed on the outer peripheral portion of the peripheral wall from the thread splitting portion to the thread pull-out portion, and the rail is fitted in the rail groove of the outer hook and is supported by the outer hook in the state of being prevented from rotating. A vertical full rotary hook having and, near the upstream rotary shaft direction end of the outer hook rotary rail and /
Alternatively, a vertical full-rotation rotary hook having a magnetic force generating portion for generating a magnetic force for displacing the inner hook to the bottom wall side is formed only near the thread dividing portion of the inner hook rail. 2. An outer hook with a circumferentially extending rail groove formed in an inner peripheral portion of a peripheral wall, which is notched in a region where a needle reciprocally moved up and down and which is driven to rotate about a substantially horizontal axis of rotation is inserted. A rail extending in the circumferential direction is formed on the outer peripheral portion of the peripheral wall from the thread splitting portion to the thread pull-out portion, and the rail is fitted in the rail groove of the outer hook and is supported by the outer hook in the state of being prevented from rotating. In a vertical full-rotation rotary hook with, a magnetic pole is formed only at the end of the peripheral wall of the outer hook on the upstream side in the outer hook rotation direction, at the portion facing the rail groove from the bottom wall side of the outer hook, and A vertical full rotation rotary hook, wherein at least a part of the inner thread hook on the bottom wall side is made of a ferromagnetic material. 3. An outer hook with a circumferentially extending rail groove formed in an inner peripheral portion of a peripheral wall, which is cut in a region where a needle reciprocally moved up and down and which is driven to rotate about a substantially horizontal axis of rotation, is inserted. A rail extending in the circumferential direction is formed on the outer peripheral portion of the peripheral wall from the thread splitting portion to the thread pull-out portion, and the rail is fitted in the rail groove of the outer hook and is supported by the outer hook in the state of being prevented from rotating. In a vertical full-rotation rotary hook with, the magnetic poles are formed only at the end of the peripheral wall of the outer hook on the upstream side in the outer hook rotational direction, at the portion facing the rail groove from the open end side of the outer hook. A vertical full-rotation rotary hook having a magnetic pole having the same polarity as that of the magnetic pole formed on the outer rotary hook, only at the yarn splitting portion, on the open end side portion of the inner rotary hook.