KR100515898B1 - Rotary shuttle device for sewing machine - Google Patents

Abstract

The present invention significantly increases the amount of bobbin winding, prevents single yarns and entanglements, and obtains a good sewing quality with a single body gib regardless of the thickness and sewing speed of the sewing material so that replacement of the hook body is unnecessary. It will be related to the rotating drum device of the sewing machine to significantly reduce the labor and labor due to the parts cost and replacement installation and to simplify the management. The present invention for realizing this is a bobbin case base (Bobbin Case Base) 30 is accommodated in the hook body (20), the hook body 20 is mounted to the drive shaft 10, the stud rod 31 is provided ) And a bobbin case (BC) consisting of a bobbin case body (50) for holding the bobbin from the outside, the bobbin case (BC) installed in the bobbin case (BC) and the bobbin winding and the winding shaft In the rotary book apparatus of the sewing machine comprising a bobbin (Bobbin) comprising a first flange that is in contact with the bottom of the bobbin case base which is one side and the second flange formed on the other end of the winding shaft, the first flange 430 A portion of the) is characterized in that it comprises a bobbin 400 provided with an inclined portion 431 is inclined toward the winding portion, the first flange 430 is rubbed with the bobbin case base 30 side Flat bottom part 433 and the outer edge side Toward the take-up is formed into a desired inclined portion 431 is formed oblique.

Description

Rotating drum device of sewing machine {ROTARY SHUTTLE DEVICE FOR SEWING MACHINE}

The present invention relates to a rotary drum device of a sewing machine, and in particular, by forming an inclined portion in the first flange of the bobbin to significantly increase the bobbin thread winding amount, to prevent single yarn and entanglement, a single model regardless of the thickness and sewing speed of the sewing material This invention relates to a rotating drum device of a sewing machine, which is capable of achieving a good sewing quality with a hook body having a gib of the hook body, thereby making it unnecessary to replace the hook body and greatly reducing manpower and effort due to replacement of parts and installation.

In general, as shown in Figure 1, the sewing machine is equipped with a rotary book device 100 for supplying the lower thread. The rotary book device 100 is mounted on a drive shaft 10 rotatably connected to a power unit and is also referred to as a hook body 20 and a bobbin case housed in the hook body 20. Bobbin Case: BC) and the bobbin bobbin (Bobbin) 40 is wound around, the bobbin case (BC) is accommodated in the hook body (20), also referred to as bobbin case base (Bobbin Case Base) ( 30 and a bobbin case body 50 for storing the bobbin from the outside of the bobbin 40.

A stud 31 is installed at the bottom of the bobbin case base 30, and a bobbin 40 is rotatably installed at the stud 31. The track body 21 is formed inside the hook body 20, and the hook 22 is formed at one end thereof. In the vicinity of the hook 22, a groove 23 having a gentle radius of curvature is formed so that the lower thread contacts and passes. And, the outer side of the bobbin case base 30 has a track 32 is inserted into the track groove 21 of the hook body 20 is formed so that the bobbin case base 30 is accommodated in the hook body 20 hook The body 20 is rotatably inserted. On the other hand, the outer half of the hook body 20 is a semi-circular gib (so that the bobbin case base 30 can be relatively rotatably mounted, and the bobbin case base 30 can be inserted or released therefrom) Gib) 25 is fixed by fastening means such as bolts. The gib 25 is provided with another hook 25a facing the hook 22 formed on the main body of the hook body 20. Further, a thread guard 26 is connected to the other half of the outer side of the hook body 20 so as to be releasably fixed to the main body of the hook body 20 by a fixing means such as a bolt. . The lower thread guard 26 is also provided with another hook 26a facing the hook 25a of the gib 25.

The bobbin case (BC) consisting of the bobbin case base (hereinafter referred to as "base") 30 and the bobbin case body (hereinafter referred to as "body") 20 are integrally coupled and are separately installed adjacent to the sewing machine body. The bobbin case (BC) is fixed so that the flow is blocked by the bracket (also called 'Osa', not shown) is fitted into the groove 33 formed in the base 30 to position. In addition, a through hole 34 for penetrating when the needle descends adjacent to the groove 33 is formed.

The bobbin 40 is composed of a winding shaft 41, which is wound on the lower thread, a first flange 43 formed at one end of the winding shaft 41, and a second flange 45 formed at the other end, and the present applicant While increasing the amount of winding of the lower thread, provided with a partition flange 47 is formed to extend the winding shaft 41 to prevent peeling and to form a recessed portion having a gradient between the first flange 43 and the second flange 45 He has previously filed a technology for extended bobbins.

Looking at the operation of the rotary book device according to such a configuration as follows.

When the sewing machine is operated, the hook body 20 is rotated and the upper thread take-up (not shown) and the needle are lifted and operated. The upper thread needle hangs the lower thread once while the hook body is rotated two times. Pull up the thread of a certain length to raise the meeting bobbin thread.

FIG. 2 is a view illustrating the bobbin case BC and the bobbin 40 in order to show that the upper thread 3 sewn on the needle 2 is hooked to the hook body 20, and FIG. 2A illustrates the needle 2. 2) When the lowering, Figure 2b is the upper thread hanging moment of the hook body 20, Figure 2c is a side view of Figure 2b.

3A to 3F sequentially show a sewing operation, wherein a, b, c, d, e, and f in each of the figures show a ', b', c ', d', on the front of the rotary book apparatus. e ', f' are a, b. c. d. e. The point of view of the rotary book device of f is turned upside down so that the bottom of the hook body 20 faces three-dimensionally.

Simultaneously with the operation of the sewing machine, the hook 2, which the upper thread 3 is sewn first, descends and the hook body 20 rotates in accordance with the lowering of the needle while the hook 22 walks down the upper thread (FIG. 2 and 3A, 3B). This is possible because the groove 2a is formed on one side of the needle 2 so that the hook 22 of the rotary body 20 can be hooked up to the thread sewn on the needle, and at this time, the needle 2 and the hook If the interval of (22) is far away, the upper thread (3) is not hooked on the hook 22, the sewing line is not skipped or sewn, too close, the needle collides with the hook (22) is broken.

In this way, the upper thread 3 hooked by the hook 22 of the hook body 20 is guided by the guard 26 of the hook body and becomes a noose to wrap up the bobbin case BC 30, 50. 4) and the upper thread (3) can be wound around the bobbin case (BC) to form a noose because the thread take-up of the upper thread pulled a certain length in the previous stroke. to be.

The length of the upper thread pulled while the thread take-up is reciprocated once coincides with the length required to wind the bobbin case BC while the hook body 20 rotates once. If the volume of the hook body (20), which is closely related to the volume of the lower thread, increases the length of the upper thread due to the take-up thread, short yarn occurs, and if the length remains, the tension of the thread is not held and the lower thread stretches and swells. Loop phenomenon (towel phenomenon) occurs.

If the amount of the lower thread in the sewing machine increases, bobbin replacement is reduced to increase workability.If the amount of the lower thread is not increased, the bobbin case accommodating the bobbin increases as the upper thread increases, as described above. Since the length of the thread take-up is limited to a certain length of the upper thread required to wind the bobbin case is short, that is, because the bobbin case (BC) can not be entered into the upper thread noose having a certain length is a single yarn occurs. The only alternative to this problem is to increase the thread take-up length of the upper thread, but it is virtually difficult to change the fundamental construction design of the sewing machine which is commonly used worldwide.

Looking at the point where the single yarn of the upper thread is generated, the upper thread noose is opened to both the base 30 and the body 50 by the guard 26 of the hook body 20 (see 3D) and then peeled off from the base 30. Inflection 36 through which the upper thread, which is contacted with the bottom surface 37 and the standing surface 35, which is a point immediately after passing the origin of the track 32 formed on the base, which is subjected to the maximum tension during the exit (see 3E). Occurs in

As an alternative to this problem, as shown in FIG. 4, the inflexion part 36 is rounded, and a part of the bottom surface 37 is dug to form a perforation part 38 to minimize the hooking. A bobbin case base 30 ′ having a configuration in which the guide track 39 is formed in the part 36 to avoid a jam may be proposed.

However, in order to increase the amount of the lower thread 4, the cloth between the bottom surface 37 and the standing surface 35 is inevitably extended to extend the bottom surface 37 of the base 30 to the outside. The gap between the study 38 becomes large, and as shown in FIG. 5, the outer edge of the first flange 43 of the bobbin 40 is exposed to the gap of the perforated part 38.

In addition, as the bobbin 40 has a larger amount of winding of the lower thread, the first flange 43 and the second flange or the partition flange 37 are opened to the outside by the tension of the thread itself.

As such, the first flange 43 of the bobbin is exposed to the gap between the perforations 38 formed in the bottom surface of the base 30 and is opened outward by the tension of the thread, so that the first flange 43 of the bobbin has an outer edge portion. And spaced between the standing surface 35 of the base 30 is caught in the first flange 43 of the bobbin opened to the outside of the standing surface 35 of the base 30 in the process of removing the upper thread noose during high-speed rotation There was a problem that single yarn occurs.

Therefore, even if the upper thread well exceeds the inflection portion 36 of the base, there is a limit to increase the amount of the lower thread due to the problem that the first flange 43 of the bobbin is caught.

Accordingly, the first flange 43 has a problem in which an irregular friction with the bottom surface 37 of the base 30 is greatly generated, so that the bobbin thread wound on the bobbin 40 is loosely entangled and entangled or single yarn is generated. While the thread is peeled off to the outside of the first flange when the spin of 40 occurs, the tip of the partition flange 47 in which the gap is generated has a risk of colliding with the needle in which the vibration is generated.

On the other hand, the hook 25a of the gib 25 mounted on the hook body 20 serves to hold the upper thread in the last step of the noose so as to maintain the tension of the upper thread crossed.

The preferred formation of the seam is that the upper thread 3 and the lower thread 4 are walked at the center of the two materials (5a, 5b) that are precisely sewn together. When hooked, as shown in FIG. 6B, the needle stitches are arranged in a straight shape in the shape of the surface of the sewing product, which is possible when the tension of the upper thread and the lower thread is exactly matched.

However, when the tension of the upper thread 3 is not maintained, as shown in FIG. 6C, the upper thread 3 sags downward. On the contrary, when the tension of the upper thread is excessively strong, as shown in FIG. 6D, the upper thread. (3) rises up and a loop phenomenon occurs in the lower thread (4).

The tension of the upper thread is the hook 25a of the hook body 20 and the gib 25, and holds the thread beyond the body 50 on the opposite side of the base 30 to the thickness and speed of the material to be sewn. As a result, the upper thread is released.

For example, even if the material is the same thickness it should be formed long enough to hold longer in the case of high-speed paddling than low speed, even if the same speed should be held longer in the case of thin material than thick material.

Therefore, the configuration of the gib 25 of the hook body 20 for tension adjustment is configured differently according to the sewing material and the sewing speed, so that the operator is equipped with dozens of hook body and hook body according to the sewing work (20) There is a problem that needs to be replaced. Another problem is that such a cast hook pulls the upper thread downward until the last step, so that the tension is biased, so that the surface of the sewing line is not formed in a straight line as shown in FIG. .

The present invention has been made to solve the above problems,

It is an object of the present invention to significantly increase the amount of winding of the lower thread by forming an inclined portion on the first flange of the bobbin, to prevent single yarns and entanglements, and to achieve good sewing quality by using a single body hook body regardless of the thickness and sewing speed of the sewing material. To provide a rotary drum device of the sewing machine to obtain.

Another object of the present invention is to provide a rotating drum device of the sewing machine to significantly reduce the manpower and effort due to the parts cost and replacement installation and easy management because it is not necessary to replace the hook body regardless of the sewing material and sewing speed.

Rotating drum device of the sewing machine according to the present invention for achieving the above object,

A bobbin case comprising a hook body mounted on a drive shaft, a bobbin case base accommodated in the hook body and provided with a stud rod, and a bobbin case body for holding the bobbin from the outside ( Bobbin Case), a bobbin installed in the bobbin case and configured to include a first shaft that is in contact with the bottom of the bobbin case base which is the one end of the winding shaft and the bobbin winding and the second flange formed on the other end of the winding shaft ( Bobbin), comprising: a bobbin having an inclined portion which is inclined toward a winding part of the first flange portion of the sewing machine comprising a bobbin.

As an embodiment according to the present invention, the first flange of the bobbin is preferably formed of a flat bottom portion rubbing against the bobbin case base side and an inclined portion inclined toward the winding portion toward the outer edge side.

The bobbin preferably includes a first flange, a winding shaft, a second flange, and a partition flange formed between the first flange and the second flange and the partition flange formed therebetween.

Here, the partition flange is preferably formed with an inclined portion that is inclined toward the first flange at the outer edge portion.

Hereinafter, with reference to the accompanying drawings an embodiment of a rotary book device of the sewing machine of the present invention will be described in more detail.

Figure 7 is an exploded perspective view of a rotary book device showing an embodiment of the present invention, Figure 8 is a cross-sectional view of the bobbin of FIG. As shown in Figure 7 and 8, the rotary book device 1 of the sewing machine according to the embodiment of the present invention is a hook body (Hook Body) 20, the hook body 20 is mounted to the drive shaft 10 Bobbin case (Bobbin Case) consisting of a bobbin case base (30) that is accommodated and provided with a stud rod (31) and a bobbin case body (50) for holding the bobbin from the outside (BC) ), A bobbin installed in the bobbin case (BC) and including a winding shaft in which the lower thread is wound and a first flange contacting the bottom of the bobbin case base, which is one end of the winding shaft, and a second flange formed at the other end of the winding shaft. (Bobbin) is made, but part of the first flange 430 is made of a bobbin 400 provided with an inclined portion 431 is formed to be inclined toward the winding.

The first flange 430 of the bobbin 400 is preferably formed of a flat bottom portion 433 rubbed with the bobbin case base 30 side and an inclined portion 431 inclined toward the winding portion toward the outer edge side.

The first flange 430 on which the inclined portion 431 of the bobbin is formed extends between the first flange 430 and the second flange 450 and is provided with a partition flange 470 formed between the winding portions. Expandable bobbin 401 consisting of two zones, or a perspective view (a) and a cross-sectional view (b) shown in Figure 9, the first flange 430 and the second flange ( 450 is applied to the basic bobbin 402 to be formed.

In the case of the extended bobbin 401, the partition flange 470 is preferably formed on the outer edge of the inclined portion 471 to be inclined toward the first flange 430 (see Figs. 7 and 8).

The operation state of the rotary book device 1 of the sewing machine according to the present invention having such a configuration will be described with reference to 10 showing the coupling state thereof.

In the present invention, the bobbin case base is formed on the first flange 430 of the bobbin 400 by forming a flat bottom portion 433 which is rubbed with the bobbin case base 30 side and an inclined portion 431 which is inclined toward the winding portion toward the outer edge side. Even when the bottom surface 37 of the 30 is formed by convexly extending the inner space, the outer edge of the first flange 430 is not exposed to the space of the perforation portion 38 of the bobbin case base. Therefore, even though the bobbin thread is wound around the bobbin 400 and the tension of the thread is acted on, the gap between the tip of the first flange 430 and the bobbin case base 30 indentation surface 35 does not occur. In the middle of the upper thread noose is not caught in the jam, the upper thread noose is riding over the inclined portion 431, the tension of the upper thread (3) is made smoothly peeling.

As described above, the upper thread noose is passed while maintaining the proper tension by riding the inclined portion 431 of the first flange.

First, since the inclined portion 431 of the first flange 430 is convex outward, in other words, the flat bottom portion 433 of the first flange 430 is deepened, and the outer edge of the first flange 430 is referred to. As a result, the length of the winding shaft 410 extends as the flat bottom portion 433 deepens, and the actual winding capacity of the bobbin is significantly increased.

In the bobbin, when the length direction of the winding shaft is increased by 1 mm, the winding capacity of the yarn is increased by 15 to 20%. As described above, the first flange 430 of the bobbin is convexly formed to the outside to be wound up and deepened. Capacity increase is enormous.

Second, the inclined portion 431 is formed to reduce the area of the flat bottom portion 433, which is a portion rubbed with the bottom 37 side of the bobbin case base 30 to reduce the frictional resistance to uniformly loosen the lower thread first Since the tip of the flange 430 is not exposed to the outside space of the bobbin case base 30, the lower thread is prevented from falling out of the first flange 430, thereby preventing single yarn or entanglement even during spin generation.

Third, the slanting portion 431 is smoothly carried over the noose of the upper thread (3) so that peeling of the upper thread noose is smoothly prevented from single yarn occurrence, thereby convexly protruding the bobbin case body 50 to the outside. By extending the receiving space of the bobbin winding axis 410 to extend the length, so that the bobbin winding amount can be increased.

On the other hand, since the noose on the bobbin case base side is smoothly crossed, the bobbin case body 50 on the opposite side also protrudes outward so as to increase the internal space. The convex protrusion part 55 of the bobbin case body 50 formed as described above maintains the tension until the upper thread noose is peeled off, thereby holding the upper end of the gib hook 25a for maintaining the tension in the prior art. The role is unnecessary, so that the configuration of the gib 25 can be commonly applied as a model regardless of the thickness of the sewing material or the sewing speed (see FIG. 10).

 Therefore, it is not necessary to have a hook body of a plurality of models including a gib that was formed in various ways depending on the thickness or sewing speed of the sewing material, which leads to the simplification of the equipment according to the sewing, the tension is maintained so that the upper thread (3) and the lower thread (4) are sewn so as to hang exactly in the middle of the two materials (see FIGS. 6A and 6B) to obtain a good sewing quality.

On the other hand, by forming the inclined portion 471 at the tip of the compartment flange 470, even if the compartment flange 470 is opened to the outside due to the tension of the wound wound, the risk of the needle (2) hit the safety is minimized This is improved.

In the above, preferred embodiments of the present invention have been described with reference to the accompanying drawings. Here, the terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, but should be interpreted as meanings and concepts corresponding to the technical spirit of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

As described in detail above, the rotary drum device of the sewing machine according to the present invention increases the amount of winding of the lower thread by forming an inclined portion in the first flange of the bobbin, and prevents single yarns and entanglement, and the thickness and sewing of the sewing material. Regardless of the speed, there is an effect of obtaining a good sewing quality by using a hook body of a single model.

In addition, regardless of the sewing material and sewing speed, the replacement of the hook body is unnecessary, manpower and labor due to the parts cost and replacement installation is drastically reduced and easy management technology.

1 is an exploded perspective view of a typical sewing machine rotary book device

2 is a view in which the upper thread sewn on the needle is hooked to the hook body 20,

2a shows the needle descending,

Figure 2b is the upper thread hanging moment of the hookbody,

2C is a side view of FIG. 2B

3A-3F is a sewing operation process diagram

Figure 4 is a perspective view of the bobbin case base of one embodiment of the prior art

Figure 5 is a cross-sectional view of the installation state of the prior art

Figure 6a is a cross-sectional view of the preferred sewing state

FIG. 6B is a top view of FIG. 6A

FIG. 6C is a diagram showing a bad state compared to FIG. 6A

FIG. 6D is a diagram showing a bad state compared to FIG. 6A

Figure 6e is a bad state compared to Figure 6b

Figure 7 is an exploded perspective view of the rotary book device of one embodiment according to the present invention

8 is a cross-sectional view of the bobbin of FIG.

9 is a perspective view (a) and a cross-sectional view (b) of another embodiment according to the present invention.

Figure 10 is a mounting state of one embodiment according to the present invention

* Explanation of symbols for main parts of the drawings

1: rotary book device 2: needle of the present invention

3: upper thread 4: lower thread

10: drive shaft 20: hook body

21: track groove 22: hook

23: home 25: gib

25a; Gibhook 26: Guard

26a: guard hook 30: bobbin case base

31: Stud 32: Orbit

33: groove 37: bottom

38: perforation part 39: guide track

40: bobbin 41: winding shaft

43: first flange 45: second flange

47: compartment flange 50: bobbin case body

51: latch 400: bobbin of the present invention

410: winding shaft 430: first flange

431: slope 433: flat bottom

450: second flange 470: compartment flange

471: slope BC: bobbin case

100: rotary book device of the prior art

Claims (5)

Hook body 20 mounted on the drive shaft 10, the bobbin case base (30) and the bobbin accommodated in the hook body 20 and provided with a stud rod 31 to hold the bobbin from the outside Bobbin case (BC) consisting of a bobbin case body (Bobbin Case Body) 50 for giving, the bobbin case base is installed in the bobbin case (BC) and the bobbin case is wound around the bobbin case and the winding shaft base In the rotary book apparatus of the sewing machine comprising a bobbin configured to include a first flange facing the bottom and a second flange formed on the other end of the winding shaft, Rotating drum device of a sewing machine, characterized in that the portion of the first flange 430 comprises a bobbin 400 provided with an inclined portion 431 is inclined toward the winding portion. The method of claim 1, The first flange 430 of the bobbin 400 is a rotary drum device of the sewing machine, characterized in that formed by the flat bottom portion 433 rubbed with the bobbin case base side and the inclined portion 431 inclined toward the winding portion toward the outer edge side. . The method according to claim 1 or 2, The bobbin 400 is formed between the first flange 430, the winding shaft 410, the second flange 450, the first flange 430 and the second flange formed with the inclined portion 431 Rotating book device of a sewing machine, characterized in that the extension is formed and the partition flange 470 is provided therebetween. The method according to claim 1 or 2, The bobbin is a rotary drum device of the sewing machine, characterized in that consisting of the first flange 430, the winding shaft 410 and the second flange 450 is formed with the inclined portion (431). The method of claim 3, wherein The partition flange 470 is a rotary drum device of the sewing machine, characterized in that the inclined portion 471 is formed to be inclined toward the first flange 430 in the outer edge.