JP2674637B2 - Vertical full rotation kettle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a vertical full rotary hook.

[0002]

2. Description of the Related Art An inner hook of a full-rotation hook of a conventional lockstitch sewing machine is made of metal, and its rail is fitted in a groove of an outer hook made of metal so that the outer hook is rotated at a high speed. Therefore, the sliding force between the rail and the rail groove causes a large frictional force, and the rotation of the outer hook cannot be performed smoothly. Therefore, the hook stopping member that stops the rotation of the inner hook and the hook stopping of the inner hook are prevented. It is not possible to smoothly remove the upper thread from the hook-fitting recess where the member is fitted, which reduces thread tightening and thus thread sewing quality. In order to solve this problem as much as possible, a configuration for supplying lubricating oil between the inner hook rail and the outer hook groove has been proposed, but such a construction is complicated and There is a risk that the thread and cloth may get dirty.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to make the sliding of the inner hook rail and the outer hook rail groove smooth, to improve thread tightening, and to improve thread sewing quality. It is to provide a full-turn hook for a lockstitch sewing machine.

[0004]

According to the present invention, a rail 11 of an inner rotary hook 2 made of polytetrafluoroethylene or ABS resin is provided at a position very close to a yarn pull-out portion 13 and at a position very close to a yarn splitting portion 19. Position, thread removal section 13 and thread splitting section 1
9 and the storage recesses 23 and 29 facing the outer side in the radial direction of the rail 11 at a position substantially in the center of the rail 11 in the circumferential direction.
Each of the storage recesses 23, 29 is formed with a ceramic ball 22 having an outer diameter smaller than the width of the rail 11 along the axial direction of the inner hook 2 rotatably and from the rail 11 to the inner hook 2. An outer hook 1 in which the rails 11 are fitted so that the rails 11 are fitted and retained so as to partially project outward in the radial direction.
V-shaped or U-shaped guide grooves 26, 28 are formed on the bottom 24 of the rail groove 12 in the plane along the axis 7 of the outer hook 1. Points 27, 27;
There is even a vertical full rotation which is characterized in that the inner hook 2 is supported by the outer hook 1 by being contacted by 28a and 28b.

[0005]

According to the present invention, the inner hook 2 is made of polytetrafluoroethylene or ABS resin and is lightweight, and each rail 11 is provided with a ceramic ball 22 and can be easily manufactured by integral molding. Further, according to the present invention, the ball 22 is provided at a position in the vicinity of the thread pulling portion 13, a position in the vicinity of the thread splitting portion 19, and between the thread pulling portion 13 and the thread splitting portion 19. The storage recesses 23, 29 formed at the position substantially in the center of the rail 11 in the circumferential direction.
In addition, the inner hook 2 can be stably supported in the outer hook 1 by the above-mentioned three balls 22 even when the outer hook 1 is stopped. For example, the ball 22 is made of ceramic, and the inner hook 2
Of the rail 11 is fitted into the rail groove 12 of the outer hook 1, and the rail groove 1
The bottom 24 of 2 is provided with a V-shaped or U-shaped guide groove 26 or 28, and since the sphere 22 is in contact with the guide groove 26 or 28 at two points, the upper thread smoothly contacts, As a result, the upper thread between the hook stopper recess of the inner hook and the inner hook stopper member attached to the lockstitch sewing machine main body is satisfactorily pulled out, whereby thread tightening is improved and thread sewing quality It is possible to improve, and it is not necessary to supply the lubricating oil to the rails and the grooves, and it is possible to prevent the threads and the cloth from being contaminated by the lubricating oil.

[0006]

1 is a sectional view perpendicular to the axis of a vertical full-rotation rotary hook of a lockstitch sewing machine, which is a premise of the present invention, and FIG. 2 is a sectional view taken along the axis thereof. Referring to these drawings, an inner hook 2 is fitted into an outer hook 1 and a bobbin 4 around which a lower thread is wound is attached to a stud 3 thereof. The bobbin 4 is housed in a bobbin case 5. It The boss 6 of the outer hook 1 is fixed to a shaft 8 having a horizontal axis 7 and is rotationally driven at a high speed. The anti-rotation recess 9 of the inner hook 2 is fitted with an inner hook anti-rotation member 10 fixed to the main stitch sewing machine body,
In this way, the rotation of the inner hook 2 is stopped. The outer hook 1 and the inner hook 2 are made of metal. The rail 11 formed on the outer peripheral portion of the inner rotary hook 2 fits into a rail groove 12 formed on the inner peripheral surface of the outer rotary hook 1 and slides.

FIG. 3 is a front view of the inner hook 2, FIG. 4 is a plan view of the inner hook 2, and FIG. 5 is a simplified plan view showing the rail 11 of the inner hook 2 in an exaggerated manner. Inner hook 2 rail 1
A rolling element composed of cylindrical rollers is provided in the vicinity of the yarn pull-out portion 13, the yarn splitting portion 19, and in the substantially central portion in the circumferential direction of the rail 11 between the yarn pulling portion 13 and the yarn splitting portion 19. A certain rotary movable part 14, 14b, 14a (hereinafter, represented by reference numeral 14) is rotatably mounted.

FIG. 6 is an enlarged sectional view of the vicinity of the rotary movable portion 14. The rail 11 is formed with a storage recess 15 into which the rotatable movable portion 14 is rotatably fitted.
4 is rotatable about its axis 16. A part of the rotatable movable portion 14 projects outward of the rail 11 in the radial direction of the inner hook 2, so that the rail groove 12 of the outer hook 1 is formed.
Touch the bottom 17 of the. As a result, the inner rotary hook 2 can be stably stored in the outer rotary hook 1, and thus the inner rotary hook 2 can be stably stopped when the outer rotary hook 1 rotates at a high speed. As a result, the upper yarn can be smoothly pulled out between the anti-rotation recess 9 of the inner hook 2 and the inner anti-rotation member 10, and thus the thread tightness can be improved. In addition, the quality of thread sewing can be improved. Outer hook 1 is A in FIG.
Rotated in the direction, the upper thread 38 is shown.

[0009]

[0010]

One embodiment of the present invention is shown in FIG. Also in this embodiment, the rotatable movable portion 22 is provided at the positions indicated by reference numerals 14, 14a and 14b in FIGS. 1, 3 and 5. The rotatable movable portion 22 of the present embodiment has a spherical shape, is fitted and retained in the storage recess 23 of the rail 11 of the inner hook 2, and is rotatably provided. Further, a V-shaped guide groove 26 is formed on the bottom of the rail groove 12 of the outer hook 1, and the rotary movable portion 22 contacts the guide groove 26 at two points 27. In this way, the inner hook 2 is stably supported and stopped in the outer hook 1.

Another embodiment of the present invention is shown in FIG. Also in this embodiment, the rotatable movable portion 22 is fitted and held in the storage recess 29, and is provided at the positions indicated by reference numerals 14, 14a and 14b in FIGS. 1, 3 and 5. This example is similar to the configuration shown in FIG. 7, but
It should be noted that the rotatable movable portion 22 is supported by being in contact with the U-shaped guide groove 28 of the rail groove 12 of the outer hook 1 at two points 28a and 28b. Therefore, even with such a structure, the inner hook 2 can be stably supported when the outer hook 1 rotates at a high speed. These spheres 22 have an outer diameter smaller than the width of the rail 11 along the axial direction of the inner hook 2 (vertical direction in FIGS. 7 and 8) and are rotatably provided. Is provided so as to partially project radially outward (to the right in FIGS. 7 and 8).

The inner hook 2 as a whole may be made of Teflon (trade name) such as polytetrafluoroethylene, or may be made of ABS resin. In this way, the weight can be reduced.

The rotatable movable portion 22 is entirely made of ceramic, and thus has a smooth surface and an outer hook 1.
The frictional force between the rail groove 12 and the guide grooves 27, 28 is small, so that when the outer hook 1 is rotating at a high speed, the inner hook 2 can be stably stopped and held, As a result, the quality of thread sewing can be improved.

[0015]

According to the present invention, the rail 11 of the inner hook 2 made of polytetrafluoroethylene or ABS resin is used.
, A ceramic ball 22 is rotatably provided. The ball 22 is located at a position very close to the thread pull-out section 13 and the thread splitting section 1.
At a position very close to 9 and at a position very close to the center of the rail 11 in the circumferential direction between the yarn pull-out portion 13 and the yarn splitting portion 19.
Each is provided so that the inner hook 2 can be stably supported on the outer hook 1, and for example, these balls 22 can be supported at intervals of about 120 degrees in the circumferential direction.

Particularly in the present invention, since the inner hook 2 is made of polytetrafluoroethylene or ABS resin as described above, it is easy to assemble the ceramic balls 22 while supporting them on the rail 11, and for example, they are manufactured by integral molding. can do.

Further, according to the present invention, since the sphere 22 is made of ceramic, the surface thereof can be made smooth and the threads can be brought into smooth contact with each other, and further the ceramic sphere 22 and the outer hook 1 can be made. The point contact between the rail groove 12 and the guide grooves 26, 28 can be smoothly performed.

Furthermore, according to the present invention, the sphere 22 has an outer diameter smaller than the width of the rail 11 along the axial direction of the inner hook 2 and is partially radially outward of the inner hook 2 from the rail 11. Because of the protrusion, even if the yarn comes into contact with these balls 22, the yarn can slide smoothly, and an undesirably large tension does not act on the yarn.

Further in accordance with the present invention, the sphere 22 has a V-shaped or U-shaped guide groove 26 in a plane formed on the bottom 24 of the rail groove 12 of the outer hook 1 along the axis 7 of the outer hook 1. , 28 are supported at two points 27: 28a, 28b in contact with each other, the frictional force is small, and the inner hook 2 can be stably supported in the outer hook 1. Even during rotation, vibration of the outer hook 2 can be prevented. This is especially true when the inner hook 2 is polytetrafluoroethylene or A
When the outer hook 1 is made of BS resin and the temperature of the outer hook 1 increases at high speed, the inner hook 2 is thermally expanded and the ball 22 can be more stably supported in the guide grooves 26 and 28.
This is extremely convenient.

[Brief description of the drawings]

FIG. 1 is a sectional view perpendicular to an axis of a vertical full-rotation rotary hook of a lockstitch sewing machine that is a premise of the present invention.

FIG. 2 is a cross-sectional view as seen from a plane passing through an axis line 7 of the vertical full rotation rotary hook shown in FIG.

FIG. 3 is a front view of an inner rotary hook 2.

FIG. 4 is a plan view of an inner rotary hook 2.

[Fig. 5] Rotating movable parts 14, 14 on the rail 11 of the inner hook 2
It is a front view for convenience of illustration showing a state in which a and 14b are attached.

FIG. 6 is an enlarged cross-sectional view of the vicinity of the rotary movable portion 14 having the configuration shown in FIGS.

FIG. 7 is a cross-sectional view of the vicinity of the rotary movable portion 22 according to the embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view of a rotary movable portion 22 and its vicinity according to another embodiment of the present invention.

[Explanation of symbols]

 1 Outer hook 2 Inner hook 4 Bobbin 5 Bobbin case 7 Axis line 8 Rotation axis 9 Inner hook preventive recess 10 Inner hook preventer member 11 Rails 12 Track groove 13 Thread pull-out section 19 Thread splitting section 22 Rotating movable section 27, 28 Guide groove

Claims (1)

(57) [Claims] 1. Polytetrafluoroethylene or AB
On the rail (11) of the inner hook (2) made of S resin, a position very close to the thread pull-out part (13), a position very close to the thread splitting part (19), and a thread pull-out part (13) A storage recess (23, 29) facing the outside in the radial direction of the rail 11 at a position approximately in the center in the circumferential direction of the rail (11) between the thread dividing portion (19).
And a ceramic ball (22) having an outer diameter smaller than the width of the rail (11) along the axial direction of the inner hook (2) is rotatably formed in each of the storage recesses (23, 29). And, the rail groove (12) of the outer hook (1) into which the rail (11) fits is retained so as to partially protrude from the rail (11) outward in the radial direction of the inner hook (2).
V-shaped or U-shaped guide grooves (26, 28) are formed in a plane along the axis (7) of the outer hook (1) at the bottom (24) of each ball (22). 2 points in (26, 28) (27,
27; 28a, 28b), and the inner hook (2) is supported by the outer hook (1).