JP2023509353A - Inner rotary sewing device with crescent hook - Google Patents

Abstract

The inner rotating sewing machine including the crescent hook of the present invention comprises a hollow cylindrical housing part with one open side, and a housing part seated on the side opposite to the open side of the housing part, so that the drive shaft can be rotated. a gear portion that rotates by transmitting rotational power; a power transmission portion that is housed inside the housing portion and rotates by transmitting the rotational power from the gear portion; and an opening of the housing portion rather than the power transmission portion. a crescent hook including a hook body portion including an annular hook for hooking a needle thread, which is housed inside the housing portion so as to be adjacent to one side of the crescent hook and which is rotated by the rotational power transmitted from the power transmission portion; , wherein a bobbin thread accommodating space is formed in the hook body portion in the same direction as the direction in which the housing portion is opened, and the bobbin thread accommodated in the bobbin thread accommodating space is , and is discharged between the hook body portion and the power transmission portion and hooked on the needle thread. [Selection drawing] Fig. 12

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner rotating sewing device including a crescent hook, and more particularly, it prevents defective sewing by maintaining the tension of a bobbin thread supplied to a sewn product and preventing the bobbin thread from tangling. An internal rotary sewing machine including a crescent hook capable of

A sewing machine is a sewing machine invented to mechanically sew clothes, bags, footwear, and other sewn items so that they can be quickly and easily manufactured.

However, the work of moving the sewing material, sewing along the sewing line, and adjusting the sewing machine are ultimately the roles of the person who adjusts the sewing machine, so the efficiency of the sewing work depends on the efficiency of the sewing machine. You will be influenced.

Since the basic principle of a sewing machine is to provide a bobbin thread, pull the top thread, and connect the bobbin thread and the top thread by mechanical actuation to form a stitch (stitch) in the sewn material, especially the bottom of the sewing machine. The thread supply device is the heart of the sewing machine. Various efforts have been made to increase the bobbin thread take-up amount.

Nevertheless, it is understood that the width, length, and height of modern sewing machines have been gradually developed to the optimum state for sewing work by human beings from the viewpoint of ergonomics. Therefore, he hesitates to modify the basic structure of the sewing machine, and as a result, the development of the bobbin thread feeding device of the sewing machine, which is a part of the sewing machine, is limited to some extent.

FIG. 1 is a view showing a bobbin thread supplying device of a conventional sewing machine, and FIG. 2 is an exploded view of FIG.

As shown in FIGS. 1 and 2, the bobbin thread feeder 1 of the prior art sewing machine is coupled to a drive shaft (D) provided at the lower side of the sewing machine so that power is supplied from the drive shaft (D). It refers to a device that provides a bobbin thread while being transmitted and rotated.

The shape of the bobbin thread feeding device 1 of the sewing machine has a circular plane and a cylindrical shape having a relatively large diameter compared to the height, so that the bobbin thread is accommodated in the bobbin thread feeding device 1 of the sewing machine. can be greatly increased.

The bobbin thread feeding device 1 for such a sewing machine includes a housing portion 10 , a gear portion 20 , a cover portion 30 , a power transmission portion 40 , a hook body portion 50 and a case portion 60 .

The housing part 10 has a cylindrical shape with one side open while forming an accommodation space inside. It accommodates the body part 50 and the like.

One side of the gear portion 20 is connected to the driving shaft (D) of the sewing machine, and rotational power is transmitted from the rotating driving shaft (D), and the rotational force is transmitted to the power transmission portion 40 by meshing of the gear teeth. say.

The gear part 20 rotates the power transmission part 40 by the power transmitted from the drive shaft (D), and the power transmission part 40 is connected to the hook body part 50, so that the power transmission part 40 rotates. The force will cause the hook body portion 50 to rotate.

The gear section 20 includes a power transmission gear section 21 and a rotary gear 23 .

The cover part 30 is configured to fix the gear part 20 to the housing part 10 so that the gear part 20 can be seated on the housing part 10 and rotated.

A plurality of fixing holes are formed through the cover portion 30 from one surface to the other surface, and the cover portion 30 is coupled to the housing portion 10 by inserting fixing means (F) into the fixing holes. make it

The cover portion 30 includes a power transmission gear cover portion 31 and a rotary gear cover portion 33 .

FIG. 3 is a view showing a power transmission part in the bobbin thread feeding device of the sewing machine of FIG.

The power transmission unit 40 is configured to rotate in synchronization with the rotary gear 23 around the rotary shaft of the rotary gear 23 .

The power transmission part 40 is obliquely formed in the accommodation space of the housing part 10 and configured to propel a part of the hook body part 50 to transmit power.

4 is a drawing showing a hook body portion of the bobbin thread feeding device of the sewing machine of FIG. 2. FIG.

The hook body part 50 is configured to rotate by transmitting rotational power from the power transmission part 40, and is formed in a cylindrical shape with one side open to form a bobbin thread accommodating space inside to store the bobbin thread. A concave portion is formed by incising a predetermined area from the outside of the hook body portion 50 toward the center of the inside, and the needle thread is applied to the hook body portion 50 while preventing the descending needle from interfering with the hook body portion. To naturally untie a needle thread from a hook body part 50 when it is entangled with a bobbin thread.

FIG. 5 is a diagram showing a state in which a separation space is formed between the power transmitting portion and the hook body portion in the bobbin thread feeding device of the sewing machine of FIG.

While the power transmission part 40 is obliquely formed, the power transmission part 40 may be further separated from the hook body part 50 toward the upper side.

Conversely, the power transmission part 40 is in close contact with the hook body part 50 as it goes downward, so that the power transmission part 40 drives the lower part of the hook body part 50. Therefore, it can be said that the hook body portion 50 is rotated.

The hook 51 of the hook body portion 50 has an annular configuration for hooking the needle thread (U), and the end of the hook 51 can be deflected toward the power transmission portion 40 side.

Since the rotating plate 41 of the power transmission part 40 can be tilted at an angle θ, the power transmission part 40 and the hook body part 50 on the upper side of the bobbin thread feeding device 1 are arranged so as to form the widest separation space (E). become.

Since the space (E) communicates with the upper thread inlet/outlet of the housing part 10, the downward facing needle with the needle thread passed through the upper thread inlet/outlet of the housing part 10 enters the space (E). At this time, the hook 51 is rotated with the upper thread.

The case portion 60 is configured to cover one open side of the hook body portion 50 and is configured to have an outer peripheral shape complementary to the planar shape of the lower thread accommodation space of the hook body portion 50 .

The case portion 60 is combined with the hook body portion 50 to prevent the lump of bobbin thread seated in the bobbin thread receiving space of the hook body portion 5 from coming off to the outside.

Here, reference numeral 62 denotes a bobbin thread discharge hole formed in the middle of the case portion 60 so that the bobbin thread is discharged from the bobbin thread storage space of the hook body portion 50 .

6 to 10 are diagrams schematically showing how the bobbin thread is fed from the bobbin thread feeder of the sewing machine of FIG.

The bobbin thread (L) housed in the bobbin thread housing space of the hook body portion 50 is formed in the middle of the case portion 60 when the hook body portion 50 rotates as shown in FIGS. Since the length of the bobbin thread (L) discharged through the bobbin thread discharge hole 62 and hung on the needle (N) is not constant, there is a problem that the tension of the bobbin thread (L) is not maintained.

In particular, in the case of FIG. 6, there is a problem that tension is excessively applied to the bobbin thread (L), and in the case of FIG. 7, the tension of the bobbin thread (L) must be constant and taut. However, otherwise, the bobbin thread (L) may get caught on the hook of the hook body portion 50 and become entangled, resulting in sewing failure.

In addition, in the case of FIG. 9, when the upper thread (U) is pulled up, the loose part of the lower thread (L) is pulled up together with the upper thread (U), thereby causing a sewing defect.

KR10-2019-0105315A

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inner rotating sewing machine including a crescent hook capable of preventing defective sewing by maintaining the tension of a bobbin thread supplied to a sewn product and preventing the bobbin thread from tangling. to provide.

In order to achieve the above object, the inner rotary sewing apparatus including the crescent hook of the present invention comprises a hollow cylindrical housing portion with one open side and a a gear part that is seated and rotates by receiving rotational power from a drive shaft; a power transmission part that is housed in the housing part and rotates by receiving rotational power from the gear part; An annular hook, which is housed inside the housing portion so as to be adjacent to the open side of the housing portion rather than the portion, is rotated by the rotational power transmitted from the power transmission portion, and hooks the needle thread. a hook body portion including a crescent hook, wherein the hook body portion is formed with a bobbin thread receiving space in the same direction as the direction in which the housing portion is opened; The bobbin thread housed in the space is discharged between the hook body portion and the power transmission portion and hooked on the upper thread.

At this time, the hook body part has a cylindrical shape and is formed with a depression that is cut from the outside toward the center of the inside. It is preferable that it is biased toward the power transmission section.

A plate-shaped bobbin thread guide plate is formed at the center of the inner peripheral surface of the recessed portion to guide the bobbin thread stored in the bobbin thread storage space between the hook body portion and the power transmission portion. be done.

Such a bobbin thread guide plate may be arranged vertically at the center of the inner peripheral surface of the recessed portion, and a bobbin thread discharge hole may be formed in the bobbin thread guide plate so that the bobbin thread passes therethrough.

Further, a convex portion is formed in a middle portion of the hook body portion on the side opposite to the surface in which the bobbin thread accommodating space is formed, and the edge of the convex portion is formed flat to form a plurality of pins. A receiving hole is formed therethrough.

A central portion of the surface of the power transmission portion facing the hook body portion is formed with a concave portion corresponding to the convex portion of the hook body portion, and the edge of the concave portion is formed flat. , a plurality of power transmission pins are protruded so as to correspond to the plurality of pin receiving holes so as to transmit rotational power to the hook body portion.

The power transmission part is obliquely arranged inside the housing part and propels a part of the hook body part to transmit power.

On the other hand, the gear part includes a power transmission gear that is connected to a drive shaft and rotates, and a rotary gear that meshes with the power transmission gear and rotates, and the power transmission part rotates about the rotation shaft of the rotary gear. Moreover, it preferably rotates in synchronism with the rotating gear.

Further, the hook of the hook body portion forms a constant space apart from the power transmission portion.

At this time, the space accommodates needles facing up and down on which upper threads are threaded.

Further, the power transmission part includes a crescent hook, and is obliquely disposed inside the housing part so as to be spaced apart from the hook body part toward the upper side of the inner rotary sewing apparatus including the crescent hook. A separation space is formed between the upper power transmission part of the inner rotary sewing machine and the hook body part.

In addition, the housing part includes a base part on which the power transmission part is seated, and a rim part protruding at a constant height along the outer circumference of the base part, and the rim part has a certain area. is cut to include an upper thread inlet/outlet that communicates with the space between the power transmission portion and the hook body portion.

Specific matters of other embodiments are included in the "Specific Contents for Carrying Out the Invention" and the attached "Drawings."

Advantages and/or features of the present invention, and the manner in which they are achieved, will become apparent with reference to the various embodiments described in detail below in conjunction with the accompanying drawings.

However, the present invention is not limited to the configurations of the embodiments disclosed below, and can be embodied in various forms different from each other. Rather, each embodiment disclosed in this specification is provided so that this disclosure will be complete and will fully convey the scope of the invention to those skilled in the art to which the invention pertains. Rather, the invention is defined only by the scope of the appended claims.

According to the present invention, the hook body portion has a lower thread accommodation space formed in the same direction as the opening direction of the housing portion. The tension of the bobbin thread supplied to the sewn product can be maintained and the entanglement of the bobbin thread can be prevented.

This makes it possible to prevent defective sewing that occurs when the tension of the bobbin thread is not constant.

FIG. 2 is a view showing a conventional bobbin thread feeding device of a sewing machine; FIG. 2 is an exploded view of FIG. 1; FIG. 3 is a view showing a power transmission part in the bobbin thread feeding device of the sewing machine of FIG. 2; FIG. 3 is a diagram showing a hook body portion of the bobbin thread feeding device of the sewing machine of FIG. 2; FIG. 3 is a view showing a state in which a separation space is formed between the power transmission portion and the hook body portion in the bobbin thread feeding device of the sewing machine of FIG. 2; FIG. 2 schematically shows a state in which a bobbin thread is supplied from the bobbin thread supplying device of the sewing machine of FIG. 1; FIG. 2 schematically shows a state in which a bobbin thread is supplied from the bobbin thread supplying device of the sewing machine of FIG. 1; FIG. 2 schematically shows a state in which a bobbin thread is supplied from the bobbin thread supplying device of the sewing machine of FIG. 1; FIG. 2 schematically shows a state in which a bobbin thread is supplied from the bobbin thread supplying device of the sewing machine of FIG. 1; FIG. 2 schematically shows a state in which a bobbin thread is supplied from the bobbin thread supplying device of the sewing machine of FIG. 1; FIG. 2 is a drawing showing an internal rotating sewing device including a crescent hook according to the present invention; FIG. 12 is an exploded view of FIG. 11; FIG. 13 is a view showing a hook body and a power transmission part in the inner rotating sewing machine including the crescent hook of FIG. 12; The drawing which showed the state which looked at the hook body part and power transmission part of FIG. 13 from the opposite side direction. FIG. 12 is a diagram schematically showing a state in which a bobbin thread is supplied from the inner rotating sewing device including the crescent hook of FIG. 11; FIG. 12 is a diagram schematically showing a state in which a bobbin thread is supplied from the inner rotating sewing device including the crescent hook of FIG. 11; FIG. 12 is a diagram schematically showing a state in which a bobbin thread is supplied from the inner rotating sewing device including the crescent hook of FIG. 11; FIG. 12 is a diagram schematically showing a state in which a bobbin thread is supplied from the inner rotating sewing device including the crescent hook of FIG. 11; FIG. 12 is a diagram schematically showing a state in which a bobbin thread is supplied from the inner rotating sewing device including the crescent hook of FIG. 11;

Best Mode for Carrying Out the Invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to setting forth the invention, the terms and words used in this specification should in no way be construed in a conventional or dictionary sense, and the inventors of the present invention should use their invention to the best of their ability. In order to describe the method, various terminology concepts can be appropriately defined and used, and these terms and words should be construed to have meanings and concepts consistent with the technical idea of the present invention.

That is, the terms used in this specification are only used to describe preferred embodiments of the present invention, and are not intended to specifically limit the content of the present invention. These terms are terms defined in consideration of various possibilities of the present invention.

Also, as used herein, singular expressions may include plural expressions unless the context clearly dictates otherwise, and likewise plural expressions shall include the singular meaning. can be done.

When an element is said to "include" another element throughout this specification, it does not exclude any other element, unless specifically stated to the contrary. It can mean that it may further include

Further, when a component is described as being “located within or connected to” another component, it means that the component is directly connected to or in contact with the other component. It may be installed, it may be installed at a certain distance, and if it is installed at a certain distance, the component is fixed or connected to another component There may be a third component or means to cause the third component or means to be omitted, and description for this third component or means may be omitted.

On the other hand, when a component is described as being "directly coupled" or "directly connected" to another component, it should be understood that there is no third component or means. must.

Similarly, other expressions describing the relationship between each component, i.e., "between" and "immediately between", or "adjacent to" and "directly adjacent to", are equivalent. should be construed as having intent.

Also, the terms "one side", "other side", "one side", "other side", "first", "second", etc. herein refer to one component , are used to clearly distinguish this one component from the other components, and these terms are not intended to be limiting in their meaning.

Also, positional terms such as "upper", "lower", "left", "right", etc. in this specification, if used, indicate the relative position in the drawing with respect to the component. and the terminology relating to these positions should not be understood to refer to absolute positions unless absolute positions are specified for these positions.

Further, in the specification of the present invention, terms such as "unit", "machine", "module", "apparatus", when used, refer to units capable of processing one or more functions or operations, It can be implemented in hardware or software, or a combination of hardware and software.

In addition, in this specification, in assigning the drawing code to each component in each drawing, the same drawing code is used for the same component even if the component is shown in another drawing. ie like reference numerals throughout the specification refer to like elements.

In the drawings attached to the present specification, the size, position, coupling relationship, etc. of each component constituting the present invention are shown for the purpose of clearly conveying the idea of the present invention or for convenience of explanation. A part may be exaggerated, reduced, or omitted, so the proportion and scale may not be exact.

In addition, in the following description of the present invention, detailed descriptions of known technologies including conventional technologies, which may obscure the gist of the present invention, may be omitted.

FIG. 11 is a view showing an inner rotary sewing machine including a crescent hook according to the present invention, and FIG. 12 is an exploded view of FIG.

The inner rotary sewing device including the crescent hook according to the present invention is connected to a drive shaft (D) provided on the lower side of the sewing machine so that power is transmitted from the drive shaft (D) to rotate and thread a bobbin thread. and includes a housing portion 100, a gear portion 200, a power transmission portion 300, and a hook body portion 400.

The housing part 100 has a hollow cylindrical shape with one open side, and accommodates the power transmission part 300, the hook body part 400, etc. through the opened one side.

Although the housing part 100 can provide a space in which the rotating drive shaft (D) can be accommodated, even if the drive shaft (D) rotates, the rotational force is not directly transmitted to the housing part 100. The housing portion 100 is preferably configured to include a base portion 110 and a rim portion 120 .

The base part 110 is formed in a substantially disc shape, forming a surface on the opposite side of the open side of the housing part 100. The base part 110 is a part (for example, a power transmission portion 300, hook body portion 400, etc.).

A plurality of holes are formed in the base portion 110 so that a power transmission gear 210 and a rotary gear 220, which will be described later, are accommodated therein.

The rim portion 120 protrudes at a constant height along the outer circumference of the base portion 110, and the inner space of the housing portion 100 is provided through the rim portion 120 and accommodated in the inner space. To prevent parts from detaching to the outside.

In addition, the rim portion 120 includes an upper thread inlet/outlet port 122 that is cut in a predetermined area and communicates with a space (E) between the power transmission portion 300 and the hook body portion 400, which will be described later.

With respect to the shape of the needle thread inlet/outlet 122, it is preferably formed in a rectangular shape, although it is not intended to limit this to a particular concept.

The needle (N) on which the needle thread is threaded can enter the inner space of the housing part 100 through the needle thread inlet/outlet 122 formed in this way, and is coupled on the housing part 100. The hook (H) of the hook body portion 400 that rotates with the needle thread can be hooked and rotated.

The gear part 200 is seated on the side opposite to the open side of the housing part 100 and rotates by receiving rotational power from the driving shaft (D).

That is, one side of the gear part 200 is connected to the driving shaft (D) of the sewing machine, and rotational power is transmitted from the rotating driving shaft (D), and the rotational force is transmitted to the power transmission part 300 by meshing of the gear teeth. to communicate.

The gear portion 200 rotates the power transmission portion 300, which will be described later, by the power transmitted from the drive shaft (D), and the power transmission portion 300 is connected to the hook body portion 400 so that the power transmission portion 300 will cause the hook body portion 400 to rotate.

The gear section 200 is configured including a power transmission gear 210 and a rotary gear 220 .

The power transmission gear 210 is directly connected to the drive shaft (D) and configured to rotate together with the rotation of the drive shaft (D) to transmit power to the rotary gear 220 .

The rotary gear 220 is configured to rotate while meshing with the power transmission gear 210, and can receive the rotational force of the power transmission gear 210 due to the rotation of the drive shaft (D).

The structure of the housing part 100 and the gear part 200 configured as described above is similar or identical to the structure disclosed in Korean Patent Application No. 10-2018-0025712 filed by the present invention. A detailed explanation is omitted.

On the other hand, the power transmission unit 300 is accommodated inside the housing unit 100 and rotates by receiving rotational power from the gear unit 200. Synchronized rotation. Details of the power transmission unit 300 will be described later with reference to FIGS. 13 and 14. FIG.

The hook body part 400 is accommodated inside the housing part 100 so as to be adjacent to the open side of the housing part 100 rather than the power transmission part 300, and is rotated by the rotational power transmitted from the power transmission part 300. However, it is configured to include an annular hook (H) for hooking the needle thread.

Details of the hook body portion 400 will be described later with reference to FIGS. 13 and 14. FIG.

FIG. 13 is a view showing the hook body and the power transmission in the inner rotating sewing machine including the crescent hook of FIG. 12, and FIG. 14 is a view of the hook body and the power transmission of FIG. It is drawing which showed the seen state.

The hook body portion 400 is rotated by transmitting rotational power from the power transmission portion 300, and is formed in a cylindrical shape with one side open, and extends in the same direction as the opening direction of the housing portion 100. 410 is formed.

In this way, the bobbin thread housed in the bobbin thread housing space 410 is discharged between the hook body portion 400 and the power transmission portion 300 and hooked onto the needle thread.

As described above, the cylindrical hook body 400 has a recessed portion 420 formed in a certain area from the outside toward the center of the inside. When the needle thread hooked on the hook body part 400 and rotates is entangled with the bobbin thread, it is naturally unwound from the hook body part 400 while not interfering with the hook body part 400.例文帳に追加

Due to the concave portion 420, the plan shape of the hook body portion 400 can be U-shaped.

An annular hook (H) is formed at one end of the recessed portion 420, and the end of the hook (H) is preferably deflected toward the power transmission portion 300 side.

As such, the overall shape of the hook body portion 400 is crescent-shaped and may be named as a so-called 'crescent hook'.

On the other hand, a plate-like bobbin thread guide plate ( P) is formed.

The bobbin thread guide plate (P) is arranged vertically at the center of the inner peripheral surface of the recessed portion 420. The bobbin thread guide plate (P) has a bobbin thread discharge hole (G) so that the bobbin thread passes through it. is formed.

An unexplained symbol S is a fixing slide for fixing a bobbin case (not shown) to the lower thread accommodation space 410 of the hook body portion 400 .

Further, a convex portion 430 is formed in the central portion of the side opposite to the surface of the hook body portion 400 on which the bobbin thread accommodating space 410 is formed, and the edge of the convex portion 430 is formed flat to form a plurality of A pin receiving hole 440 is formed therethrough.

The pin receiving hole 440 is a hole penetrating from one surface of the hook body portion 400 to the other surface so as to receive the power transmission pin 330 formed in the power transmission portion 300 .

In relation to the shape of the pin receiving hole 440, although not limited to a particular concept, the power transmission pin 330 is preferably formed in a hemispherical shape so that it can be easily received. , the pin receiving hole 440 is preferably circular.

In addition, the position and the number of the pin receiving holes 440 are such that the pin receiving holes 440 are configured to be coupled with the power transmission pins 330 , and a plurality of positions of the hook body portion 400 corresponding to the power transmission pins 330 are formed. is preferred.

On the other hand, the hook (H) of the hook body portion 400 forms a certain separation space (E) with the power transmission portion 300. At this time, the separation space (E) is formed by hooking the needle thread. Accommodates up-and-down needles.

The power transmission part 300 and the hook body part 400 in the upper part of the inner rotating sewing machine including the crescent hook form the widest space (E).

Since the separated space (E) communicates with the upper thread inlet/outlet 122 of the housing part 100, the downward facing needle with the upper thread hooked thereon passes through the upper thread inlet/outlet 122 of the housing part 100, and the separated space ( E), and at this time, the hook (H) rotates with the upper thread hooked.

The power transmission part 300 rotates in synchronism with the rotation gear 220 about the rotation shaft of the rotation gear 220 , and is formed obliquely inside the housing part 100 and is part of the hook body part 400 . may be configured to propel and transmit power.

Thus, while the power transmission part 300 is obliquely formed, the power transmission part 300 is further separated from the hook body part 400 toward the upper side, and conversely, the hook body part 400 is further separated from the hook body part 400 toward the lower side. It comes in close contact with 400 without forming an isolated space (E).

This can be said that the power transmission part 300 propels the lower part of the hook body part 400 to rotate the hook body part 400 .

In addition, a concave portion 310 is formed in a central portion of the surface of the power transmission portion 300 facing the hook body portion 400 so as to correspond to the convex portion 430 of the hook body portion 400 .

The edge of the recess 310 is formed flat, and a plurality of power transmission pins 330 are protruded to correspond to the plurality of pin receiving holes 440 to transmit rotational power to the hook body 400 .

As described above, the power transmission pin 330 is preferably formed in a hemispherical shape, but may be implemented in any number of other shapes.

Furthermore, it can be said that the intervals between the plurality of power transmission pins 330 may or may not be fixed, and include all various embodiments.

Preferably, the power transmission pin 330 can propel the lower part of the hook body part 400 to rotate the hook body part 400 as described above. The distance between the transmission pins 330 may be narrower at the lower portion of the power transmission portion 300 than at the upper portion of the power transmission portion 300 .

15 to 19 are diagrams schematically showing a state in which the bobbin thread is supplied from the inner rotary sewing device including the crescent hook of FIG. 11. FIG.

When the bobbin thread (L) is fed to the sewing material, keeping the tension of the bobbin thread (L) constant is a very important key in determining the quality of sewing.

The separation space (E) between the power transmission part 300 and the hook body part 400 communicates with the needle thread inlet/outlet 122 of the housing part 100, so that the needle thread (U) is hung thereon and the needle (N) facing downward. passes through the upper thread inlet/outlet 122 of the housing portion 100 and enters the separation space (E), and at this time, the hook (H) rotates while hooking the upper thread (U).

15 to 19, the bobbin thread (L) received in the bobbin thread receiving space 410 of the hook body portion 400 is discharged between the hook body portion 400 and the power transmission portion 300. The tension of the bobbin thread (L) supplied to the sewn product can be maintained and the bobbin thread (L) can be prevented from being entangled. This makes it possible to prevent defective sewing that occurs when the tension of the bobbin thread (L) is not constant.

Although various preferred embodiments of the present invention have been described above with some examples, the description of the various embodiments set forth in the "Detailed Description" section of the present invention is illustrative. Those who have ordinary knowledge in the technical field to which the present invention belongs can implement the present invention by variously modifying it based on the above description, or implement the present invention equivalently. The point can be understood.

In addition, the present invention can be embodied in various forms, and thus the present invention is not limited to the above description. The preceding description is provided so that this disclosure will be complete and complete, and will fully convey the scope of the invention to those skilled in the art to which the invention pertains. and the invention is defined only by the following claims.

REFERENCE SIGNS LIST 100 housing portion 110 base portion 120 rim portion 122 needle thread inlet/outlet port 200 gear portion 210 power transmission gear 220 rotating gear 300 power transmission portion 310 concave portion 330 power transmission pin 400 hook body portion 410 bobbin thread accommodating space 420 concave portion 430 convex portion 440 Pin housing hole U Needle thread L Bobbin thread N Needle E Separation space D Drive shaft H Hook P Bobbin thread guide plate G Bobbin thread discharge hole S Bobbin case fixing slide

Claims (12)

a hollow cylindrical housing part with one side open; a gear part seated on the opposite side of the housing part to the side opposite to the one side with the opening and rotating by receiving rotational power from a drive shaft; a power transmission part that is housed inside the gear part and rotates by transmitting rotational power from the gear part; An inner rotating sewing apparatus including a crescent hook that is housed inside and rotates by receiving rotational power transmitted from the power transmission unit and that includes a hook body portion including an annular hook for hooking a needle thread,
A bobbin thread accommodating space is formed in the hook body portion in the same direction as the direction in which the housing portion is opened,
The bobbin thread housed in the bobbin thread housing space is discharged between the hook body portion and the power transmission portion and hung on the needle thread, thereby reducing the amount of bobbin thread supplied to the sewn product. characterized by maintaining the tension and preventing the phenomenon of the bobbin thread getting entangled,
Inner rotating sewing device with crescent hook. The hook body part has a cylindrical shape, and is formed with a recess that is cut from the outside toward the center of the inside. characterized by being biased to the side,
An internal rotating sewing device comprising the crescent hook of claim 1. A plate-like bobbin thread guide plate is formed at the center of the inner peripheral surface of the recessed portion to guide the bobbin thread housed in the bobbin thread housing space between the hook body portion and the power transmission portion. characterized by
An inner rotary sewing device comprising the crescent hook of claim 2. The bobbin thread guide plate is arranged vertically in the center of the inner peripheral surface of the recessed portion, and the bobbin thread guide plate is formed with a bobbin thread discharge hole through which the bobbin thread passes,
An inner rotary sewing device comprising the crescent hook of claim 3. A convex portion is formed in a central portion of a side surface of the hook body portion opposite to the surface in which the bobbin thread accommodating space is formed, and an edge of the convex portion is formed flat to form a plurality of pin accommodating holes. is formed through,
An inner rotary sewing device comprising the crescent hook of claim 2. A concave portion is formed in a central portion of a surface of the power transmission portion facing the hook body portion so as to correspond to the convex portion of the hook body portion. A plurality of power transmission pins are protrudingly formed so as to correspond to the plurality of pin accommodation holes so as to transmit rotational power to the body portion,
An inner rotating sewing device comprising the crescent hook of claim 5. The power transmission part is obliquely arranged inside the housing part and propels a part of the hook body part to transmit power.
An inner rotary sewing device comprising the crescent hook of claim 6. The gear unit includes a power transmission gear that is connected to a drive shaft and rotates, and a rotary gear that meshes with the power transmission gear and rotates,
The power transmission unit rotates in synchronization with the rotary gear about the rotation shaft of the rotary gear,
An internal rotating sewing device comprising the crescent hook of claim 1. The hook is characterized by forming a constant space between the power transmission unit,
An inner rotary sewing device comprising the crescent hook of claim 2. The space is characterized in that the upper thread is hung and a needle facing up and down is accommodated,
An inner rotary sewing device comprising the crescent hook of claim 9. The power transmission part is obliquely disposed inside the housing part so as to be spaced apart from the hook body part toward the upper side of the inner rotary sewing machine including the crescent hook. A separation space is formed between the power transmission part of the upper part of the sewing machine and the hook body part,
An inner rotating sewing device comprising the crescent hook according to any one of claims 1-10. The housing part includes a base part on which the power transmission part is seated, and a rim part protruding at a constant height along the outer periphery of the base part,
The rim portion is cut in a certain area to include an upper thread inlet/outlet that communicates with a space between the power transmission portion and the hook body portion.
An internal rotating sewing machine comprising the crescent hook of claim 11.

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