WO2021242084A1

WO2021242084A1 - Internally rotatable sewing device including crescent hook

Info

Publication number: WO2021242084A1
Application number: PCT/KR2021/095062
Authority: WO
Inventors: 심용군
Original assignee: 크레센트훅 주식회사
Priority date: 2020-05-27
Filing date: 2021-05-26
Publication date: 2021-12-02
Also published as: CN115087771B; JP2023509353A; KR102276467B1; CN115087771A; JP7473995B2

Abstract

The present invention relates to an internally rotatable sewing device including a crescent hook, the sewing device comprising: a housing part having an open one side and formed in a hollow cylindrical shape; a gear part seated at a side opposite to the open one side of the housing part and rotated by rotation power transferred from a driving shaft; a power transfer part received in the housing part and rotated by rotation power transferred from the gear part; a hook body part which is received in the housing part while being closer to the open one side of the housing part than to the power transfer part and is rotated by rotation power transferred from the power transfer part, the hook body part including a ring-shaped hook which catches an upper thread, wherein a lower thread receiving space is formed in the hook body part in a direction identical to the direction in which the housing part is open, and the lower thread received in the lower thread receiving space is configured to be discharged between the hook body part and the power transfer part and caught by the upper thread.

Description

Internal rotating sewing device with crescent hooks

The present invention relates to an internal rotation sewing apparatus including a crescent hook, and in particular, an internal rotation type including a crescent hook capable of preventing defective sewing by maintaining the tension of the lower thread supplied to the sewing material and preventing the lower thread from being twisted. It is about sewing equipment.

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

However, in the sewing operation, the operation of moving the sewing material, sewing along the sewing line, or adjusting the sewing machine is ultimately the responsibility of the person adjusting the sewing machine, so the efficiency of the sewing operation depends on the efficiency of the sewing machine.

The basic principle of a sewing machine is to have a lower thread and pull the upper thread to weave the lower thread and upper thread by mechanical operation to form stitches (sweat) on the sewing material. The amount of refreshment provided by the sewing machine's lower thread is the most important factor in determining the continuity of the sewing operation and determines the efficiency of sewing.

Nevertheless, it is understood that the width, length, and height of modern sewing machines have been progressively developed from an ergonomic point of view to an optimized state that a person can perform sewing work in, and in the industry, the basic structure of the sewing machine is They are hesitant to apply deformation, and accordingly, the development of the sewing machine lower thread supply device, which is a part, also has some limitations.

1 is a view showing a sewing machine lower thread supply apparatus according to the prior art, FIG. 2 is an exploded view of FIG. 1 .

As shown in FIGS. 1 and 2, the sewing machine lower thread supply device 1 according to the prior art is coupled to a drive shaft D provided on the lower side of the sewing machine, receives power from the drive shaft D, and rotates, while rotating the lower thread device that provides

As the shape of the sewing machine lower thread supply device 1 has a circular plane and a cylindrical shape having a relatively large diameter compared to its height, the capacity of the lower thread to be accommodated in the sewing machine lower thread supply device 1 is greatly increased. can

The sewing machine lower thread supply device 1 includes a housing unit 10 , a gear unit 20 , a cover unit 30 , a power transmission unit 40 , a hook body unit 50 , and a case unit 60 . .

The housing part 10 is configured in a cylindrical shape with one side open while forming an accommodating space on the inside, and the rotating gear 23 , the rotating gear cover 33 , and the power transmission unit 40 into the accommodating space through the open one side. ), the hook body part 50 and the like are accommodated.

Gear unit 20, one side is connected to the drive shaft (D) of the sewing machine, receives rotational power from the rotating drive shaft (D) and transmits the rotational force to the power transmission unit 40 by the meshing of the gear teeth. .

The gear unit 10 rotates the power transmission unit 40 with the power transmitted from the drive shaft D, and the power transmission unit 40 is connected to the hook body unit 50 , and the power transmission unit The rotational force of ( 40 ) rotates the hook body part ( 50 ).

Such a gear unit 20 includes a power transmission gear unit 21 and a rotation gear 23 .

The cover part 30 refers to a configuration in which the gear part 20 is fixed to the housing part 10 so that the gear part 20 is seated on the housing part 10 and rotates.

A plurality of fixing holes penetrating from one surface to the other surface are formed on the cover portion 30 , and by inserting the fixing means (F) into the fixing holes, the cover portion 30 can be coupled to the housing portion 10 . .

Such a cover part 30 includes a power transmission gear cover part 31 and a rotation gear cover part 33 .

3 is a view showing a power transmission unit in the sewing machine lower thread supply device of FIG. 2 .

The power transmission unit 40 refers to a configuration in which the rotational shaft of the rotational gear 23 rotates in synchronization with the rotational gear 23 about the rotational center.

The power transmission unit 40 is formed to be inclined on the receiving space of the housing unit 10 to propel a portion of the hook body unit 50 to transmit power.

4 is a view showing a hook body in the lower thread supply device for the sewing machine of FIG. 2 .

The hook body part 50 is configured to rotate by receiving rotational power from the power transmission part 40, and is formed in a cylindrical shape with one side open to form a lower thread accommodating space therein.

The lower thread is stored, and a depression is formed in which a predetermined area is cut from the outside to the inner center of the hook body part 50 to prevent the needle coming down after hanging the upper thread from interfering with the hook body part 50 while being caught on the hook body part 50. When the rotating upper thread is intertwined with the lower thread, it is naturally released from the hook body 50 .

5 is a view showing a state in which a separation space is formed between the power transmission unit and the hook body in the lower thread supply device for the sewing machine of FIG. 2 .

As the power transmission unit 40 is formed to be inclined, the power transmission unit 40 may be more spaced apart from the hook body 50 toward the upper side.

Conversely, the power transmission unit 40 is in close contact with the hook body part 50 as it goes to the lower side without forming a separation space, and the power transmission unit 40 pushes the lower part of the hook body part 50 to the hook body part. (50) can be seen as rotating

The hook 51 of the hook body 50 has a ring-shaped configuration on which the upper thread U is hung, and the end of the hook 51 may be biased toward the power transmission unit 40 .

The rotating plate 41 of the power transmission unit 40 may be inclined at an angle of θ, and the power transmission unit 40 and the hook body unit 50 in the upper part of the lower thread supply device 1 have the widest separation space. (E) is formed.

Since the separation space (E) communicates with the upper thread inlet and outlet of the housing unit 10, the needle that hangs the upper thread downward passes through the upper thread inlet and outlet of the housing unit 10 and enters the separation space (E). At this time, the hook 51 hangs the upper thread and rotates.

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

The case part 60 is coupled to the hook body part 50 to prevent the lower thread bundle seated in the lower thread accommodating space of the hook body part 5 from being separated to the outside.

Here, reference numeral 62 denotes a lower thread discharge hole formed in the center of the case unit 60 so that the lower thread is discharged from the lower thread receiving space of the hook body unit 50 .

6 to 10 are views schematically illustrating a state in which the lower thread is supplied from the lower thread supply device of the sewing machine of FIG. 1 .

As shown in FIGS. 6 to 10 , the lower thread L accommodated in the lower thread accommodating space of the hook body part 50 is a lower thread discharge hole formed in the center of the case part 60 when the hook body part 50 rotates. There is a problem in that the tension of the lower thread (L) is not maintained because the length of the lower thread (L) discharged through the needle (N) is not constant.

In particular, in the case of Fig. 6, there is a problem that the tension of the lower thread (L) is excessively applied, and in the case of Fig. 7, the tension of the lower thread (L) should be constant and tight, but this is not the case, and the lower thread (L) is attached to the hook body ( 50), there is a problem of causing a sewing defect by causing a kinking phenomenon by being caught on the hook.

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

[Prior art literature]

[Patent Literature]

(Patent Document 1) KR 10-2019-0105315 A

It is an object of the present invention to provide an internal rotational sewing device including a crescent hook capable of preventing defective sewing by maintaining the tension of the lower thread supplied to the sewing material and preventing the lower thread from being twisted.

In order to achieve the above object, an internal rotation sewing device including a crescent hook of the present invention includes a housing part having a hollow cylindrical shape with one open side, and is seated on the opposite side to the open side of the housing part to receive rotational power from a drive shaft. A gear unit rotated by receiving transmission, a power transmission unit accommodated in the housing unit and rotated by receiving rotational power from the gear unit, and adjacent to an open side of the housing unit rather than the power transmission unit inside the housing unit An internal rotation type sewing device including a crescent hook which is accommodated and rotates by receiving rotational power from the power transmission unit, and including a hook body portion including a hook-shaped hook for hanging an upper thread, in the same direction as the opening direction of the housing As a result, a lower thread accommodating space is formed in the hook body, and the lower thread accommodated in the lower thread accommodating space is discharged between the hook body and the power transmission unit to be caught by the upper thread.

At this time, it is preferable that the hook body portion is formed in a cylindrical shape to form a depression cut out from the outside to the inside center direction, a hook is formed at one end of the depression portion, and the end of the hook is biased toward the power transmission unit.

In addition, a plate-shaped lower thread guide plate for guiding the lower thread accommodated in the lower thread accommodating space between the hook body and the power transmission unit is formed in the center of the inner circumferential surface of the recessed part.

The lower thread guide plate may be vertically disposed in the center of the inner circumferential surface of the depression, and a lower thread discharge hole may be formed in the lower thread guide plate to allow the lower thread to pass therethrough.

In addition, a convex portion is formed in the middle of the hook body portion opposite to the surface on which the lower thread receiving space is formed, and the convex portion is formed with a flat edge, so that a plurality of pin accommodating holes are formed therethrough.

In addition, a concave portion is formed in a concave shape corresponding to the convex portion of the hook body portion in a central portion of the surface facing the hook body portion in the power transmission unit, and the rim of the concave portion is formed flat to apply rotational power to the hook body portion A plurality of power transmission pins are formed to protrude to correspond to the plurality of pin receiving holes to transmit.

The power transmission unit is disposed at an angle inside the housing unit to propel a portion of the hook body unit to transmit power.

On the other hand, the gear unit includes a power transmission gear connected to the drive shaft to rotate, and a rotation gear to be rotated in engagement with the power transmission gear, and the power transmission unit rotates in synchronization with the rotation gear around the rotation axis of the rotation gear as a rotation center. It is preferable to do

In addition, the hook of the hook body part is characterized in that it forms a predetermined space between the power transmission part and the.

At this time, the spaced space accommodates the needle which hangs the upper thread and goes up and down.

In addition, the power transmission unit is inclinedly disposed inside the housing portion so as to be spaced apart from the hook body toward the upper portion of the inner rotation sewing device including the crescent hook, the power transmission unit of the upper portion of the inner rotation sewing device including the crescent hook and forming a space between the hook body and the hook body.

In addition, the housing part includes a base part on which the power transmission part is seated, and a rim part protruding at a predetermined height along an outer periphery of the base part, and the rim part is formed by cutting a predetermined area between the power transmission part and the hook body part. It includes an upper thread inlet and outlet communicating with the separation space of

Specific details of other embodiments are included in "Details for carrying out the invention" and the accompanying "drawings".

Advantages and/or features of the present invention, and methods of achieving them, will become apparent with reference to the various embodiments described below in detail in conjunction with the accompanying drawings.

However, the present invention is not limited to the configuration of each embodiment disclosed below, but may also be implemented in a variety of different forms, and each embodiment disclosed in this specification only makes the disclosure of the present invention complete, It is provided to fully inform those of ordinary skill in the art to which the invention pertains to the scope of the present invention, and it should be understood that the present invention is only defined by the scope of each claim.

According to the present invention, a lower thread accommodating space is formed in the hook body in the same direction as the opening direction of the housing, and the lower thread accommodated in the lower thread accommodating space is discharged between the hook body and the power transmission unit to be caught by the upper thread. , there is an effect of maintaining the tension of the lower thread supplied to the sewing material to prevent the lower thread from being twisted.

Accordingly, it is possible to prevent sewing defects that occur when the tension of the lower thread is not constant.

1 is a view showing a sewing machine lower thread supply device according to the prior art.

FIG. 2 is an exploded view of FIG. 1 .

11 is a view showing an internal rotation sewing device including a crescent hook according to the present invention.

FIG. 12 is an exploded view of FIG. 11 .

13 is a view showing a hook body and a power transmission unit in the internal rotation sewing apparatus including the crescent hook of FIG. 12 .

14 is a view showing a state in which the hook body part and the power transmission part of FIG. 13 are viewed from the opposite direction.

15 to 19 are views schematically showing a state in which the lower thread is supplied from the internal rotation sewing device including the crescent hook of FIG. 11 .

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

Before describing the present invention in detail, the terms or words used in this specification should not be construed as being unconditionally limited to their ordinary or dictionary meanings, and in order for the inventor of the present invention to explain his invention in the best way It should be understood that the concepts of various terms can be appropriately defined and used, and furthermore, these terms or words should be interpreted as meanings and concepts consistent with the technical idea of the present invention.

That is, the terms used herein are only used to describe preferred embodiments of the present invention, and are not used for the purpose of specifically limiting the content of the present invention, and these terms represent various possibilities of the present invention. It should be understood that the term has been defined taking into account.

In addition, in the present specification, it should be noted that, unless the context clearly indicates otherwise, the expression in the singular may include a plurality of expressions, and even if it is similarly expressed in plural, it may include the meaning of the singular. do.

In the case where it is stated throughout this specification that a component "includes" another component, it does not exclude any other component, but further includes any other component unless otherwise stated. It could mean that you can.

Furthermore, when it is described that a component is "exists in or connected to" of another component, this component may be directly connected to or installed in contact with another component, and a certain It may be installed spaced apart by a distance, and in the case of being installed spaced apart by a certain distance, a third component or means for fixing or connecting the component to another component may exist, and now It should be noted that the description of the components or means of 3 may be omitted.

On the other hand, when it is described that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the third element or means does not exist.

Similarly, other expressions describing the relationship between components, such as "between" and "immediately between", or "neighboring to" and "directly adjacent to", have the same meaning. should be interpreted as

In addition, in this specification, terms such as "one side", "other side", "one side", "other side", "first", "second", etc., if used, for one component, this single component It is used to be clearly distinguished from other components, and it should be understood that the meaning of the component is not limitedly used by such terms.

In addition, in the present specification, terms related to positions such as "upper", "lower", "left", and "right", if used, should be understood as indicating a relative position in the drawing with respect to the corresponding component, Unless an absolute position is specified with respect to their position, these position-related terms should not be construed as referring to an absolute position.

Moreover, in the specification of the present invention, terms such as “…unit”, “…group”, “module”, “device”, etc., if used, mean a unit capable of processing one or more functions or operations, which means hardware Alternatively, it should be understood that it may be implemented in software, or a combination of hardware and software.

In addition, in this specification, in specifying the reference numerals for each component of each drawing, the same component has the same reference number even if the component is shown in different drawings, that is, the same reference is made throughout the specification. Symbols indicate identical components.

In the drawings attached to this specification, the size, position, coupling relationship, etc. of each component constituting the present invention are partially exaggerated, reduced, or omitted for convenience of explanation or in order to sufficiently clearly convey the spirit of the present invention. may be described, and therefore the proportion or scale may not be exact.

In addition, in the following, in describing the present invention, a detailed description of a configuration determined that may unnecessarily obscure the gist of the present invention, for example, a detailed description of a known technology including the prior art may be omitted.

11 is a view showing an internal rotation sewing apparatus including a crescent hook according to the present invention, FIG. 12 is an exploded view of FIG. 11 .

An internal rotation sewing device including a crescent hook according to the present invention is coupled to a drive shaft (D) provided on the lower side of a sewing machine, receives power from the drive shaft (D) and rotates while rotating, and as a device for providing a lower thread, a housing unit 100 , a gear unit 200 , a power transmission unit 300 , and a hook body unit 400 .

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

Although the housing part 100 may provide a space in which the rotating drive shaft D can be accommodated, it is preferable that a direct rotational force is not transmitted to the housing part 100 even when the driving shaft D rotates, and the housing The part 100 is configured to include a base part 110 and a rim part 120 .

The base part 110 is formed in a substantially disk-shaped surface on the other surface opposite to the open side of the housing part 100 , and the components accommodated in the housing part 100 (eg, a power transmission part). (300), the hook body portion 400, etc.) is supported.

A plurality of holes are formed in the base part 110 to accommodate the power transmission gear 210 and the rotation gear 220, which will be described later.

The rim part 120 is formed to protrude to a certain height along the outer periphery of the base part 110, and the internal space of the housing part 100 is provided through the rim part 120, and the parts accommodated in the internal space are separated to the outside. to prevent

In addition, the rim portion 120 includes an upper thread inlet and outlet 122 in communication with the separation space E between the power transmission unit 300 and the hook body 400 to be described later by cutting a certain area.

In relation to the shape of the upper thread inlet and outlet 122 , it is not limited to any specific concept, but may preferably be formed in a rectangular shape.

Through the upper thread inlet and outlet 122 formed in this way, the needle N on which the upper thread is hung can enter the inner space of the housing 100 , and the hook body 400 is coupled to and rotates on the housing 100 . ) hook (H) hangs the upper thread and can rotate.

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

That is, the gear unit 200 has one side connected to the drive shaft D of the sewing machine, receives rotational power from the rotating drive shaft D, and transmits the rotational force to the power transmission unit 300 by engagement of the gear teeth.

The gear unit 200 rotates a power transmission unit 300 to be described later with power transmitted from the drive shaft D, and the power transmission unit 300 is connected to the hook body unit 400, and the power transmission unit The rotational force of 300 rotates the hook body 400 .

Such a gear unit 200 includes a power transmission gear 210 and a rotation 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 rotation gear 220 .

The rotation gear 220 is configured to rotate in engagement with the power transmission gear 210 , and may receive rotational force of the power transmission gear 210 due to the rotation of the drive shaft D .

The configuration of the housing part 100 and the gear part 200 made as described above is similar to or the same as the configuration disclosed in Patent Application No. 10-2018-0025712 invented and applied for by the present inventor, so a more detailed description is to be omitted.

On the other hand, the power transmission unit 300 is accommodated in the housing unit 100 and receives rotational power from the gear unit 200 to rotate, and the rotational gear 220 is rotated around the rotational axis of the rotational gear 220 as a center of rotation. rotates in synchronization with A detailed description of the power transmission unit 300 will be described later based on FIGS. 13 and 14 .

The hook body part 400 is accommodated in the housing part 100 adjacent to the open side of the housing part 100 rather than the power transmission part 300 and rotates by receiving rotational power from the power transmission part 300 . , It is made to include a hook (H) in the shape of a ring for hanging the upper thread.

A detailed description of the hook body 400 will be described later with reference to FIGS. 13 and 14 .

13 is a view showing a hook body and a power transmission unit in the internal rotation sewing device including the crescent hook of FIG. 12 , and FIG. 14 is a view showing the hook body and the power transmission unit of FIG. 13 as viewed from the opposite direction.

The hook body 400 receives rotational power from the power transmission unit 300 to rotate, and is formed in a cylindrical shape with one open side, and the lower thread receiving space in the same direction as the opening direction of the housing unit 100 ( 410) is formed.

The lower thread accommodated in the lower thread accommodating space 410 as described above is discharged between the hook body 400 and the power transmission unit 300 to be caught on the upper thread.

As such, the hook body 400 having a cylindrical shape is formed with a depression 420 in which a predetermined area is cut from the outside to the inside center direction, while the needle coming down after hanging the upper thread does not interfere with the hook body 400 When the rotating upper thread caught on the hook body 400 is woven with the lower thread, it is naturally released from the hook body 400 .

The planar shape of the hook body 400 may be a U-shape due to the depression 420 .

An annular hook H is formed at one end of the depression 420 , and the end of the hook H is preferably biased toward the power transmission unit 300 .

As such, the overall shape of the hook body 400 is made in the shape of a crescent moon, so it may be called a so-called 'crescent hook'.

On the other hand, in the center of the inner circumferential surface of the recessed portion 420, a plate-shaped lower thread guide plate P for guiding the lower thread accommodated in the lower thread accommodating space 410 between the hook body 400 and the power transmission unit 300 is formed.

The lower thread guide plate P is vertically disposed in the center of the inner circumferential surface of the recessed portion 420 , and the lower thread discharge hole G is formed in the lower thread guide plate P to allow the lower thread to pass therethrough.

Unexplained reference numeral S denotes a fixed slide for fixing the bobbin case (not shown) to the lower thread receiving space 410 of the hook body 400 .

In addition, the convex part 430 is formed in a convex shape in the middle of the hook body part 400 on the opposite side to the surface on which the lower thread receiving space 410 is formed, and the rim of the convex part 430 is formed to be flat. of the pin receiving hole 440 is formed through.

The pin accommodating hole 440 refers to a hole formed to penetrate the other surface from one surface of the hook body 400 to accommodate the power transmission pin 330 formed in the power transmission unit 300 .

Although it is not limited to any specific concept in relation to the shape of the pin receiving hole 440 , the power transmission pin 330 is preferably formed in a hemispherical shape, and the pin receiving hole 440 is easily accommodated therein. ) is preferably configured in a circular shape.

In addition, the position and number of the pin accommodating hole 440 is, in that the pin accommodating hole 440 is configured to be coupled with the power transmission pin 330 , the hook body portion 400 corresponding to the power transmission pin 330 . It is preferable to form a plurality on the position of.

On the other hand, the hook (H) of the hook body part 400 forms a certain separation space (E) between the power transmission unit 300 and, at this time, the separation space (E) hangs the upper thread and accommodates the needle that goes up and down. do.

The power transmission unit 300 and the hook body 400 form the widest space E at the upper side of the internal rotation sewing device including the crescent hook.

Since this separation space (E) communicates with the upper thread inlet/outlet 122 of the housing part 100, the needle that hangs the upper thread and goes down passes through the upper thread inlet/outlet 122 of the housing part 100 into the separation space (E). In this case, the hook (H) hangs the upper thread and rotates.

The power transmission unit 300 rotates in synchronization with the rotation gear 220 about the rotation axis of the rotation gear 220 as a rotation center, and is formed to be inclined inside the housing unit 100 to remove a portion of the hook body unit 400 . It may be configured to transmit power by propulsion.

As the power transmission unit 300 is formed to be inclined as described above, the power transmission unit 300 is spaced apart from the hook body 400 toward the upper side, and vice versa, as it goes toward the lower side, the space E is spaced apart from the hook body unit 400. ) and come into close contact without forming

It can be seen that the power transmission unit 300 rotates the hook body 400 by pushing the lower side of the hook body 400 .

In addition, a concave portion 310 is formed in a concave shape corresponding to the convex portion 430 of the hook body portion 400 in the middle portion of the surface facing the hook body portion 400 from the power transmission portion 300 .

The rim of the concave portion 310 is formed to be flat, and a plurality of power transmission pins 330 protrude to correspond to the plurality of pin receiving holes 440 to transmit rotational power to the hook body portion 400 .

The power transmission pin 330 is preferably formed in a hemispherical shape as described above, but can be implemented in any other shape.

In addition, the interval between the plurality of power transmission pins 330 may be determined to be constant or may not be considered to include all various embodiments.

Preferably, the power transmission pin 330 pushes the lower side of the hook body 400 to rotate the hook body 400. As described above, in order to facilitate the transmission of the rotational force, the neighboring power transmission pins 330 ) may be configured to be narrower in the lower portion of the power transmission unit 300 than in the upper portion of the power transmission unit 300 .

When the lower thread (L) is supplied as a sewing material, maintaining the tension of the lower thread (L) is a very important key in determining the quality of sewing.

Since the separation space E between the power transmission unit 300 and the hook body 400 communicates with the upper thread inlet and outlet 122 of the housing part 100, the needle N that hangs the upper thread U and descends is It passes through the upper thread inlet and outlet 122 of the housing part 100 and enters the separation space E, and at this time, the hook H hangs the upper thread U and rotates.

In addition, the lower thread L accommodated in the lower thread accommodating space 410 of the hook body 400 is discharged between the hook body 400 and the power transmission unit 300 as shown in FIGS. 15 to 19 , and the upper thread By being caught on (U), it is possible to maintain the tension of the lower thread (L) supplied to the sewing material to prevent the lower thread (L) from being twisted, and accordingly, the tension of the lower thread (L) is not constant. In this case, it is possible to prevent defective sewing.

In the above, although several preferred embodiments of the present invention have been described with some examples, the description of various various embodiments described in the "Specific Contents for Carrying Out the Invention" item is merely exemplary, and the present invention Those of ordinary skill in the art will understand well that the present invention can be practiced with various modifications or equivalents to the present invention from the above description.

In addition, since the present invention can be implemented in various other forms, the present invention is not limited by the above description, and the above description is intended to complete the disclosure of the present invention, and is usually It should be understood that this is only provided to fully inform those with knowledge of the scope of the present invention, and that the present invention is only defined by each of the claims.

[Explanation of code]

100: housing part

110: base part

120: rim

122: upper thread entry/exit

200: gear unit

210: power transmission gear

220: rotation gear

300: power transmission unit

310: concave

330: power transmission pin

400: hook body part

410: lower thread accommodation space

420: depression

430: convex part

440: pin receiving hole

U: upper thread

L: lower thread

N: needle

E: separation space

D: drive shaft

H: hook

P : Lower thread guide plate

G : lower thread outlet hole

S: bobbin case fixed slide

Claims

A housing part having a hollow cylindrical shape with one open side, a gear part seated on the opposite side to the open one side of the housing part and rotating by receiving rotational power from a drive shaft, is accommodated in the housing part and rotates from the gear part A power transmission unit rotated by receiving power, and accommodated in the housing unit adjacent to the open side of the housing unit rather than the power transmission unit, and rotated by receiving rotational power from the power transmission unit, a ring shape for hanging an upper thread An internal rotation sewing device comprising a crescent hook including a hook body including a hook of

A lower thread receiving space is formed in the hook body in the same direction as the opening direction of the housing,

The lower thread accommodated in the lower thread accommodating space is discharged between the hook body and the power transmission unit and is hooked on the upper thread.
The method according to claim 1,

The hook body part is made of a cylindrical shape, a recessed part cut from the outside to the inside center direction is formed, a hook is formed at one end of the recessed part, and the end of the hook is biased toward the power transmission part. It includes a crescent hook internal rotation sewing device.
3. The method according to claim 2,

An internal rotational sewing device including a crescent hook, characterized in that a plate-shaped lower thread guide plate is formed in the center of the inner circumferential surface of the recessed part to guide the lower thread accommodated in the lower thread accommodating space between the hook body and the power transmission unit.
4. The method according to claim 3,

The lower thread guide plate is vertically disposed in the center of the inner circumferential surface of the recessed portion, and the lower thread guide plate has a lower thread discharge hole formed therein to allow the lower thread to pass through.
3. The method according to claim 2,

Crescent hook, characterized in that in the hook body portion, a convex portion is formed in a convex shape in the middle of the surface opposite to the surface on which the lower thread receiving space is formed, and the rim of the convex portion is formed flat and a plurality of pin accommodation holes are formed therethrough. An internal rotation sewing device comprising a.
6. The method of claim 5,

A concave portion is formed in a concave shape corresponding to the convex portion of the hook body portion in a central portion of the surface facing the hook body portion in the power transmission unit, and the rim of the concave portion is formed flat to transmit rotational power to the hook body portion Internal rotation sewing device including a crescent hook, characterized in that a plurality of power transmission pins are protruded to correspond to the plurality of pin receiving holes.
7. The method of claim 6,

The power transmission unit is disposed at an angle inside the housing unit to propel a portion of the hook body unit to transmit power.
The method according to claim 1,

The gear unit includes a power transmission gear connected to the drive shaft to rotate, and a rotation gear to rotate in engagement with the power transmission gear,

The power transmission unit is an internal rotation sewing device including a crescent hook, characterized in that the rotation in synchronization with the rotation gear with respect to the rotation axis of the rotation gear.
3. The method according to claim 2,

The hook is an internal rotational sewing device including a crescent hook, characterized in that forming a predetermined space between the power transmission unit and the.
10. The method of claim 9,

The spaced space is an internal rotation sewing device including a crescent hook, characterized in that for receiving the needle that hangs up and down the upper thread.
11. The method according to any one of claims 1 to 10,

The power transmission unit is inclinedly disposed inside the housing unit so as to be spaced apart from the hook body toward the upper side of the internal rotation sewing device including a crescent hook, and the power transmission unit and the hook of the upper portion of the internal rotation sewing device including a crescent hook Internal rotation sewing device comprising a crescent hook, characterized in that forming a space between the body portion.
12. The method of claim 11,

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 an outer periphery of the base part,

The rim part is cut in a certain area and internal rotational sewing device including a crescent hook, characterized in that it comprises an upper thread inlet and outlet communicating with the separation space between the power transmission part and the hook body part.