KR20220082620A - omnidirectional lock stitchable rotary shuttle - Google Patents

Abstract

The present invention is a rotary drum for hitch stitch invented by the present inventor, leaving the position of the needle as it is in the prior art, and as in the prior art, the needle thread penetrates the hole of the needle from the other side of the bobbin case base to one side. With the stitch side thread of the needle thread loop in the U-shape posture rotated around the bobbin thread by jumping rope, even if the fabric is moved in all directions in the plane, the needle thread loop is always in the U-shape without changing the X-shape posture. It is about the revolving drum tube that gave the posture.

Description

Omnidirectional lock stitchable rotary shuttle

The present invention relates to a revolving drum tube capable of omnidirectional lockstitch, and more particularly, even if the fabric is moved in all directions on a plane, the hitch stitch, which is entangled needlework, is not implemented, but only the lockstitch, which is a perfect stitch, is implemented in a pattern sewing machine or embroidery machine. It relates to a revolving drum that can be applied to.

)와 엉킴 바늘질인 히치 스티치(

) 가 있다.The perfect stitch, Lock Stitch (

) and a hitch stitch (

) is there.

The rotary drum that implements the lockstitch has been applied to sewing machines, embroidery machines, and pattern sewing machines from the old days to the present. It is disclosed in Japanese Patent Laid-Open No. 9-122369.

In the conventional rotary drum for lock stitch disclosed above, since the tip of the drive shaft is fixed to one end of the rotary hook body, one side of the rotary hook body facing the drive shaft in the direction of the rotation axis of the drive shaft is blocked by the drive shaft. , the other side of the rotary hook body with its back on the drive shaft is open. Therefore, in the U-shaped loop of the needle thread (upper thread) formed as the needle goes down and rises, the supply-side thread and the stitch-side thread extend in the vertical direction, so that the supply-side thread crosses the bobbin along the other side of the bobbin case base. You can jump rope with respect to the case base, but the stitch side thread is blocked by the drive shaft, so you can't jump rope across one side and against the bobbin case base. I can't do jump rope exercise.

In order for the U-shaped loop of the needle thread to jump rope with respect to the bobbin case base 1, as shown in Figs. In a state in which the hook 41 is hung by the hook 41, the stitch side thread Ra on the outer surface of the hook 41 moves toward the other side of the bobbin case base 1, so that the U-shaped loop of the needle thread crosses in an X-shaped posture. While doing so, the U-shaped loop of the needle thread can jump rope with respect to the bobbin case base (1) by riding across the other side of the bobbin case base (1).

In order for the stitch side thread Ra on the outer surface of the hook 41 to smoothly skip the rope with respect to the bobbin case base 1, in the rotation direction of the hook 41, the stitch side thread Ra is in front of the supply side thread Rb. needs to be located.

To this end, in the conventional rotary drum for lock stitching, as shown in FIG. 2 , the needle thread guide 2 has an annular rail 3 therebetween and a gap radially outward with respect to the hook 41 . Since it is disposed adjacent to the hook 41, the needle thread loop R can no longer move in the opposite direction to the rotation of the hook 41 by the needle thread guide 2, so that the hook 41 rotates. In the direction, the supply-side thread Rb is positioned in front of the stitch-side thread Ra, and in this state, when the hook 41 is further rotated, as shown in FIG. 3 , the stitch-side thread Ra of the needle thread becomes the needle. As it enters between the gap between the thread guide 2 and the hook 41 , the posture of the stitch-side thread Ra is changed to be positioned in front of the supply-side thread Rb in the rotational direction of the hook 41 .

In addition, in the conventional revolving drum for lock stitch, as shown in FIG. 3 , in order to prevent the supply side chamber Rb located on the inner surface of the hook 41 from moving any further in the rotational direction of the hook 41 , as shown in FIG. Since the inner hook 4 is provided between the hook 41 and the annular rail 3, the stitch side thread Ra is located in front of the supply side thread Rb in the rotation direction of the hook 41, so that the needle thread is In a state where the stitch-side thread Ra and the supply-side thread Rb have needle thread loops R crossed in an X-shape posture as a whole, the needle thread loop R moves with respect to the bobbin case base 1 . .

As shown in FIG. 4 , the rotary drum tube for lockstitch having such a structure implements lockstitch by manipulating a bobbin thread and a needle thread.

First, in the moving direction of the fabric, the bobbin thread (B) is positioned in front of the needle thread loop (R), and the bobbin thread (B), the supply side thread (Rb) of the needle thread loop (R), and the needle thread loop ( In the state in which the stitch-side thread Ra of R) is set to be sequentially arranged in the drive shaft direction from the bobbin case base 1, when the needle N descends and then rises, the loop ( R) is formed.

In this state, when the hook 41 rotates counterclockwise, as shown in FIG. Ra), the needle thread loop (R) is hung on the hook (41) in a state in front (bobbin case base side).

In this state, when the hook 1 is further rotated counterclockwise, as shown in Figs. 1 to 3, and as shown in Fig. 4 (c), the supply of the needle thread loop (R) As the side thread Rb and the stitch side thread Ra are changed into the X-shaped posture, as seen in FIG. 4 , the stitch side thread Ra of the needle thread loop R is the supply side thread Rb of the needle thread loop R In the state located in front (in the counterclockwise direction), the stitch side thread (Ra) of the needle thread loop (R) turns around the bobbin thread (B) to close the front side (the other side) of the bobbin case base (1). It is positioned at the lower end of the bobbin case base (1) across.

In this state, when the hook 41 rotates further counterclockwise and the needle thread is pulled upward by the thread take-up, the needle thread loop R comes out of the hook 41 and a lock stitch is formed on the fabric. do.

Therefore, in the conventional rotating drum for lock stitch, the stitch side thread Ra of the needle thread loop R slides into contact with the outer surface of the hook 41 and the other side of the bobbin case base 1, and when viewed in FIG. 4, the front Because it returns to , a left-handed yarn needle thread as shown on the left side of FIG. 5 is used.

If the needle thread of the accidental yarn as shown in the right side of FIG. 5 is used in the conventional revolving drum for lockstitch, the needle thread of the accidental yarn is loosened, and the thickness of the needle thread increases so that the inner surface of the needle and the Friction between needle threads increases, leading to disconnection.

However, even if the needle thread of the left-twisting yarn is used in the conventional revolving drum for lockstitch, in the state that the posture of the left-twisted yarn is changed from the U-shaped loop to the X-shaped loop, the stitch side thread (Ra) of the needle thread is more in the left-twisting direction. As it is twisted, it passes over the outer surface of the hook 41 and the other side of the bobbin case base 1 and performs a skipping movement with respect to the bobbin case base 1 to form a lock stitch on the fabric. After completion of , as the state of the twisted stitch is relaxed due to the left twisted yarn, wrinkles are generated in the fabric near the lock stitch, which has a disadvantage in that there are many wrinkles in the fabric near the lock stitch seam.

In addition, in the conventional revolving drum for lock stitch, the bobbin thread B is positioned in front of the needle thread loop R in the moving direction of the fabric, and as shown in FIG. 4 , the hook 41 rotates counterclockwise. It is known that a lockstitch is implemented, and when the fabric is reversed in this state, a hitchstitch is realized. For this reason, when the conventional lock-stitch rotary drum is applied to an embroidery machine or a pattern sewing machine in which only lock stitches are to be uniformly implemented, hitch stitches that reduce the uniformity of stitches in the reverse section of the fabric are implemented.

In order to prevent the hitch stitch from being implemented, for example, as disclosed in Japanese Patent Application Laid-Open No. 2008-23261, a method of changing the posture of the needle thread loop in the area where the hitch stitch is implemented is taken.

In this way, the position change means of the needle thread loop (R) and the electronic control means for controlling the posture change means are additionally required by identifying the area where the hitch stitch is spherical, thereby reducing the manufacturing cost of the embroidery machine or pattern sewing machine. There is a problem of increasing it.

Therefore, in order to prevent the occurrence of wrinkles that occur in the conventional revolving drum for lockstitch and the occurrence of hitch stitches that impair sewing uniformity, the needle thread loop does not jump with respect to the bobbin case base in the X-shaped loop state, and does not perform a U-shape movement. In the loop state, jump rope exercise should be performed on the bobbin case base as it is.

However, in the conventional revolving drum for lockstitch, the needle thread loop (R) is made into a U-shaped loop, and the supply side thread (Rb) of the needle thread loop (R) is moved to the other side of the bobbin case base (1) to the bobbin case base. When skipping rope with respect to (1), the stitch side thread Ra of the needle thread loop R is blocked by the drive shaft, so that the needle thread loop R cannot jump rope with respect to the bobbin case base in the U-shaped posture.

In the end, in order to jump-rope the U-shaped loop of the needle thread with respect to the bobbin case base, there is no choice but to use the hitch-stitch revolving drum set in Korean Patent Registration No. 1657607, which was patented and registered by the present inventor.

In the revolving drum box for hitch stitches presented above, in a state in which the needle thread loop has a U-shaped posture, the supply side thread passes over the other side of the bobbin case base, and the stitch side thread passes over one side of the bobbin case base. After the side thread turns around the bobbin thread and crosses the stitch side thread and changes its posture to an X-shaped loop, the hitch stitch is realized by the thread take-up that is in the opposite direction to the fabric advancing direction while the fabric is advancing, and in this state When the fabric is reversed, lockstitch can be implemented.

In summary, in a state in which the exit of the bobbin thread is disposed on the other side than the needle thread loop (R), the conventional lock-stitch rotating drumstick changes the posture of the needle thread loop (R) to an X-shape, then the needle thread loop (R) is a method (hereinafter, referred to as the first method) in which the stitch side yarn comes out around the bobbin yarn by skipping rope movement; And the above presented revolving drum for hitch stitches is a method of changing the posture of the needle thread loop (R) to an X-shape while the supply side thread of the needle thread loop (R) comes out around the bobbin thread by the jumping rope movement (hereinafter the second method) Then, depending on the forward and backward direction of the fabric, a lock stitch or a hitch stitch (refer to FIG. 8 b ) is implemented.

The reason why the stitches are implemented differently depending on the forward and backward directions of the fabric is that the stitches are implemented in the X-shaped posture of the needle thread loop (R).

That is, if the needle thread loop (R) is stitched in the X-shaped posture, the lock stitch is performed when the needle thread loop (R) in the X-shaped posture becomes the open position due to movement of the fabric in any one of the forward and backward directions. And, when the needle thread loop R of the X-shape posture becomes the closed posture by the distal end movement in the other direction among the forward and backward, a hitch stitch occurs.

As a result, the needle thread loop (R) does not realize the stitch in the X-shaped position, and the needle thread loop (R) makes the stitch side thread of the needle thread loop (R) go around the bobbin thread in the U-shaped position, so that the stitch is realized. The inventors found that it is important to find out the rules by which the lockstitch is implemented regardless of the direction in which the fabric is transported.

In addition, in consideration of the above rule that the stitch type is changed according to the direction of fabric movement and the position of the bobbin thread and needle thread in the revolving drum tube in which the needle thread can jump rope in a U-shape, Japanese Patent Application Laid-Open No. 9- In the conventional rotary drum tube for lock stitch as disclosed in No. 122369, since the needle thread guide 2 covers the bobbin case base 1 from above, the exit position of the bobbin thread cannot be changed as desired, but the bobbin case base ( In the above-mentioned hitch-stitch revolving drum invented by the present inventor by excluding the needle thread guide covering 1) from above, since the exit position of the bobbin thread can be changed arbitrarily, the above-mentioned hitch-stitch for It is necessary to study a way to change the exit position of the bobbin thread in various ways in the revolving drum barrel and to always implement only the lock stitch while the fabric moves two-dimensionally in a plane.

The present invention has a problem in solving the above problems.

In the present invention, in the above-described rotary drum for hitch stitch invented by the present inventor, the position of the needle is left as it is in the prior art, and as in the prior art, the needle thread penetrates the needle ear from the other side of the bobbin case base to one side direction In the state that the stitch side thread of the needle thread loop in the U-shape posture crosses one side of the bobbin case base and the supply side thread crosses the other side of the bobbin case base, the needle thread loop is brought out around the bobbin thread by the jumping rope movement. Even if the fabric is moved in an omnidirection in a plane, the above problem can be solved by always having the needle thread loop always in a U-shaped posture without changing the X-shaped posture.

According to the present invention, even with the needle thread made of left-twisted yarn, the supply-side thread of the needle thread loop is passed through the other side of the bobbin case base by the hook in the U-shaped posture by the problem solving means as described above. In addition, since the stitch side thread passes through one side of the bobbin case base and the stitch side thread moves around the bobbin case and performs a skipping motion with respect to the bobbin case base, the needle thread is additionally twisted in the left twist direction than in the conventional lock stitch revolving drum box. Therefore, it is possible to significantly prevent wrinkles from occurring in the fabric due to the needle line (sewing line) implemented on the fabric with the lock stitch.

In addition, the present invention is applied to an embroidery machine or a pattern sewing machine in which the rotary drum of the present invention implements 360-degree pattern sewing, because the lockstitch is always implemented even when the fabric moves two-dimensionally in the omnidirection on the needle plate. Even if it does, it is possible to implement a uniform lock stitch on the fabric while preventing the implementation of a hitch stitch with lower sewing quality than the lock stitch (perfect stitch) with a simpler structure and lower cost than conventional ones.

1 is a conceptual view showing the entry of a hook into a needle thread loop in a conventional revolving drum for lock stitching;
2 is a conceptual view showing a state in which the needle thread loop of FIG. 1 is prevented from moving in the opposite direction of the rotational direction of the hook by the hook and the needle thread guide;
3 is a conceptual view showing a state in which the supply side thread and the stitch side thread of the needle thread loop of FIG. 2 are reversed;
4 is a schematic diagram sequentially showing steps in which a lock stitch is implemented by a conventional rotary drum for lock stitch;
5 is a conceptual diagram showing a left twisted and a coincidental story;
6 is centered on the point where the rotation axis of the drive shaft and the trajectory line of the needle elevate movement meet, the lower side is the bobbin case base side (the other side), the upper side is the power transmission side (one side), and the rotation direction of the hook is Schematic diagram showing the area where lockstitch and hitchstitch occur by arranging various positions of the exit of the bobbin room in the state of rotating from right to left;
7 is a view showing the needle thread loop is stepped by a hook when the pre-stitch is positioned in the 10 o'clock, 3 o'clock, and 8 o'clock positions in a state where the exit of the bobbin thread is located at the 1 o'clock direction, and the bobbin case base is A schematic diagram showing the direction around the bobbin thread while jumping rope,
Figure 8 is a needle thread loop by a hook when the pre-stitching is positioned at 10 o'clock, 3 o'clock, and 8 o'clock in a state where the exit of the bobbin thread is positioned at 12 o'clock, 8 o'clock, and 2 o'clock; A schematic perspective view showing the direction of the bobbin thread while walking and jumping rope with respect to the bobbin case base;
9 is a view showing the bobbin while the needle thread loop is stepped by the hook and jumping rope with respect to the bobbin case base when the pre-stitch is positioned at the 4 o'clock and 8 o'clock positions with the exit of the bobbin thread positioned at the 12 o'clock direction. A schematic diagram showing the direction in which the thread turns around,
10 is an exploded perspective view showing a rotary drum tube according to an embodiment of the present invention;
11 is a perspective view showing the rotary drum tube of FIG. 10 from the opposite side;
12 is a combined perspective view of FIG. 10;
13 is a first power transmission projection and push projection and a second power transmission projection and push projection of the power transmission rotation unit when the output shaft is rotated in the rotary drum tube of FIG. 10, and the position of the first step portion and the second step portion of the hook body A schematic diagram showing the phase difference when viewed from the power transmission side,
14 is a step in which the lock stitch is implemented by the rotary drum tube according to the embodiment of the present invention, showing the needle thread loop jumping rope when viewed from the bobbin case base side in a state in which the fabric is moving forward and in a state in which the fabric is moving backward. A schematic diagram showing sequentially,
15 is a step in which the lock stitch is implemented by the rotary drum tube according to the embodiment of the present invention, showing that the needle thread loop jumps rope when the bobbin case base is viewed from above in a state in which the fabric is moving forward and in a state in which the fabric is moving backward. A schematic diagram showing sequentially,
16 is a step in which the lock stitch is implemented by the rotary drum tube according to the embodiment of the present invention, in a state in which the fabric moves to the left and to the right when the bobbin case base is viewed from above, the needle thread loop skipping the rope a schematic diagram showing that, and
17 is a schematic diagram showing a state in which the bobbin case base of the rotary drum tube and the hook handle protrusion are in contact according to an embodiment of the present invention when the bobbin case base is viewed from above.

The present inventor, in the above-described rotary drum for hitch stitches invented by the present inventor, in order to grasp the rule for changing the stitch type according to the direction of the fabric and the position of the bobbin thread and the needle thread, as in the prior art, the position of the needle In the state that the needle thread penetrates the needle ear from the other side of the bobbin case base to one side direction as in the prior art, and the needle thread loop has a U-shaped posture, the fabric is moved from the plane to the omnidirection. While doing this, I tried to implement the stitch by changing the exit position of the bobbin thread in various ways.

As a result, referring to FIG. 6 , when the needle is viewed from above, the intersection (O) where the rotation axis (y) of the drive shaft or hook body and the trajectory line of the needle's elevating movement meet as the center, and the lower side is the bobbin The case base side (the other side), the upper side is the power transmission side (one side), the hook rotates counterclockwise around the rotation axis (y), and an orthogonal axis (x) orthogonal to the rotation axis (y) ), the position of the exit 1a of the bobbin thread in a state in which the fabric advances in the plane formed by When positioned, because the stitch is implemented in the second manner described above in which the supply-side thread returns around the bobbin thread, the perfect stitch lock stitch (PS) is implemented in the 162 degree area, and the hitch stitch (PS) is implemented in the remaining 198 degree area. HS) is implemented; As shown in FIG. 6B , when the exit of the bobbin thread is located between 9:00 and 12:00, the needle thread loop is changed from the U-shaped posture to the X-shaped posture despite not being in the first and second methods described above. Thus, the perfect stitch lock stitch (PS) is implemented in the 45 degree area, and the hitch stitch (HS) is implemented in the remaining 315 degree area; As shown in FIG. 6C , when the exit of the bobbin thread is located between 3 and 6 o'clock, the lock stitch PS, which is a perfect stitch in the 280 degree area, is formed because the stitch is implemented in the second method described above. implemented, and the hitchstitch HS is implemented in the remaining 80 degree region; As shown in Fig. 6D, when the exit of the bobbin thread is located between 12:00 and 3:00, the needle thread loop is changed from the U-shaped posture to the X-shaped posture despite not being in the first and second methods described above. Thus, the perfect stitch lock stitch (PS) is implemented in the 280 degree area, and the hitch stitch (HS) is implemented in the remaining 80 degree area; And, as shown in FIG. 6E , even when the exit of the bobbin thread is located at 6 o'clock, the lock stitch PS, which is a perfect stitch, is implemented in the 280 degree area because the stitch is implemented in the second method described above. , the inventor found that the hitch stitch (HS) is implemented in the remaining 80 degree region.

Further, in the conventional revolving drum for lock stitch, as shown in Fig. 6G, even when the exit of the bobbin thread is located at 6 o'clock, even though the stitch side thread of the needle thread loops around the bobbin thread, the 200 degree area The present inventor found that the perfect stitch lock stitch (PS) is implemented in , and the hitch stitch (HS) is implemented in the remaining 160 degree area.

The inventor found that, among the exit positions of the bobbin thread, when the exit of the bobbin thread is located between 12 and 6 o'clock, the perfect stitch lock stitch PS is realized even if the fabric moves forward and backward. Thus, such a revolving drum tube has been presented in the pending Korean Patent Application No. 10-2020-0141651 filed on October 29, 2020.

In addition, the present inventor realized the stitch by locating the exit position of the bobbin thread at 12 o'clock as a position other than the exit positions of the bobbin thread described above. It has been found that the stitch-in lockstitch (PS) is implemented.

As the present inventor studied the reason, the following principle was discovered.

When the needle descends, passes through the needle hole of the needle plate, and then rises again on the needle plate, a needle thread loop is formed under the needle plate. It is decided whether to have an X-shaped posture or not.

The reason is that, as shown in FIG. 7, which is shown in the same state as in FIG. 6, when the bobbin room exit 1a is located at 1 o'clock, the pre-stitch BS formed immediately before the 10 o'clock direction or 3 When positioned in the clockwise direction, the stitch side thread (Ra) line segment of the needle thread that comes out of the needle ear (Na) and extends to the pre-stitch (BS) via the needle plate hole (H) for the needle, and the needle plate for the needle at the bobbin thread outlet (1a) It is located below the line segment of the bobbin thread (B) extending to the pre-stitch (BS) via the hole (H) in the direction of the rotation axis (y) of the drive shaft, and in this state, the needle thread loop (R) is attached to the hook (41). When the jumping rope is performed with respect to the bobbin case base 1 by The line segment, in the space between the needle N and the upper part of the bobbin case base 1, in the rotation direction of the hook 41, rather than the line segment of the bobbin thread B extending from the bobbin thread outlet 1a to the pre-stitch BS When viewed, the perfect stitch (PS), which is a left-twisted lock stitch regardless of the direction of the fabric, is realized by skipping rope while having a U-shaped posture, and the pre-stitch (BS) formed just before When positioned at the 8 o'clock position, the stitch side thread (Ra) line segment of the needle thread that comes out of the needle ear (Na) and extends to the pre-stitch (BS) via the needle plate hole (H) for the needle is pre-stitched at the bobbin thread outlet (1a). It is located above the line segment of the bobbin thread (B) extending to (BS) in the direction of the rotation axis (y) of the drive shaft, and in this state, when the needle thread loop (R) is jumped right with respect to the bobbin case base (1), Fig. 8 As shown in c, during thread take-up, the stitch-side thread (Ra) line segment of the needle thread that extends from the bottom of the bobbin case base (1) to the pre-stitch (BS) is from the bobbin thread exit (1a) to the pre-stitch (BS). In the space between the needle (N) and the upper part of the bobbin case base (1) rather than the stretched bobbin thread (B) line segment, when viewed from the rotational direction of the hook 41, it is arranged in the front and has an X-shaped posture while jumping rope. , direction to open the needle thread loop in the X-shaped posture This is because, when the fabric is moved to the lock stitch, perfect stitch PS is implemented, and when the fabric is moved in the closing direction (x), the hitch stitch HS is implemented.

However, if the exit of the bobbin thread is located at 12 o'clock, as shown in FIG. 9 , even if the pre-stitch formed immediately before is located at the 8 o'clock or 3 o'clock position, it comes out of the needle eye Na and the needle plate hole for the needle. The stitch-side thread (Ra) line segment of the needle thread extended to the pre-stitch (BS) via (H) extends from the bobbin thread exit (1a) to the pre-stitch (BS) via the needle plate hole (H) for the needle. It is always located lower than the line segment of (B) in the direction of the rotation axis (y) of the drive shaft, and in this state, if the needle thread loop (R) is jumped right with respect to the bobbin case base (1), as shown in FIG. Similarly, during thread take-up, the stitch-side thread (Ra) line segment of the needle thread extending from the bottom of the bobbin case base (1) to the pre-stitch (BS) extends from the bobbin thread exit (1a) to the pre-stitch (BS) (B) ), when viewed from the rotation direction of the hook 41 in the space between the needle N and the upper part of the bobbin case base 1, rather than the line segment, it is disposed behind in the rotation direction of the hook 41 and has a U-shaped posture while By skipping the rope, the perfect stitch PS, which is a left-twisted yarn lock stitch, is realized regardless of the moving direction of the fabric W.

The reason is that in the direction of the rotation axis (y) of the drive shaft, the stitch-side thread (Ra) line segment of the needle thread extending from the needle ear (Na) to the pre-stitch (BS) extends from the bobbin thread outlet (1a) to the pre-stitch (BS). With respect to the line segment of the bobbin thread (B), the inventors have found that the fabric is always arranged backward in the rotational direction of the hook 41 without being reversed in all planar regions around the moving needle.

Accordingly, when the exit of the bobbin room is located within the range between 3 and 9 o'clock, as shown in FIG. 8B , the second method described above in which the supply-side thread jumps in an X-shape posture while returning around the bobbin room. There is a case in which a stitch is implemented in this case, whereby a lock stitch is implemented in some areas and a hitch stitch is implemented in another area; When the bobbin thread exit is located within the range between 9:00 and 3:00 excluding 12:00, the stitch side thread returns around the bobbin thread, but the needle thread segment extending from the needle eye to the pre-stitch and the bobbin thread extending from the bobbin thread exit to the pre-stitching In a certain area, the position of the line segment is reversed in the direction of the rotation axis of the driving shaft, and the skipping motion in an X-shaped posture is performed, as shown in FIG. When the stitch is implemented and the hitch stitch is implemented in another area, and the exit of the bobbin thread is located at 12 o'clock, the needle thread loop has a U-shaped posture, as shown in FIG. Lockstitch is implemented regardless of the direction of movement.

Hereinafter, a structure for a rotary drum tube capable of omnidirectional lock stitch will be described in detail with reference to FIGS. 10 to 17 .

In the following description of the rotary drum tube in which the omnidirectional lock stitch is possible, one side means a power transmission side, and the other side means a bobbin case base side.

In the rotary drum tube 100 of this embodiment, as shown in FIGS. 12, 14 and 15 , the stitch side thread Ra of the needle thread loop R penetrating the hole of the needle N is disposed on one side, and , in a state where the supply side thread Rb is disposed on the other side, the needle thread loop R can cross both sides of the bobbin case base 1 and perform a jumping rope movement with respect to the bobbin case base 1, not shown. The hook 41 of the hook body 40 is moved in the front direction of the sewing worker by the power transmission projection revolving so that a part of the rim of the hook body 40 comes into contact with the power transmission projection 30 fixedly circumscribed on the output shaft. It has a structure in which the needle thread loop (R) is rotated step by step in the direction of advancing the fabric.

In addition, one side of the bobbin base case (1) is closed and the other side is open so that the bobbin case (5) can be detached, and a loop (R) on which the hook 41 can hang while allowing the needle to freely ascend and descend. ), a cutout is formed near the other side of the bobbin base case (1) as in the prior art, and on the other side of the bobbin base case (1), the protrusion of the ridge of the housing to be described later A female groove (1b) for accommodating (21) is formed.

In addition, in the rotary drum tube 100, as shown in the upper part of Fig. 14 and the upper part of Fig. 15, the ascending and descending trajectory line of the needle (N) is orthogonal to the axis of rotation of the hook body (40) and fits In the positioned state, as shown in FIGS. 11 and 12 , the bobbin thread outlet 1a formed in the bobbin case 5 detachably mounted on the bobbin case base 1 is the hook body 40 . adjacent to the power transmission side (one side) than the needle thread loop (R) in the direction of the rotation axis of It is arranged on the rotation axis line (on the rotation axis line of the output shaft). The bobbin chamber outlet 1a may be formed in the bobbin case base 1 as another embodiment.

In addition, in the rotary drum 100, the supply side thread Rb of the needle thread loop R crosses the other side (the side facing the power transmission side) of the bobbin case base 1 and the loop The stitch side thread Ra of (R) crosses one side (the side facing the power transmission side) of the bobbin case base 1, so that the needle thread loop R skips the rope with respect to the bobbin case bay 1 To move, the hook 41 of the hook body 40 and the bobbin case base 1 are shaped to form a lock stitch (perfect stitch).

That is, the hook 41 has a triangular shape with a hypotenuse facing one side and a longitudinal side extending parallel to the direction of advancing the fabric in the front direction of the sewing worker, and one end of the hypotenuse 41a meeting the vertical side In the direction of the rotation axis of the hook 41 of the hook body 40, it is adjacent to the needle N rather than the stitch-side thread Ra of the loop R, and the other end of the hypotenuse 41a is the bobbin case base 1 ) to one side of the

With such a configuration, the state in which the lockstitch is realized when the fabric advances in the front direction of the sewing worker will be described in detail with reference to the upper part of FIG. 14 and the upper part of FIG. 15 .

As shown in FIG. 14 a, when the needle N descends in the 12 o'clock direction to make the needle thread loop R in the 12 o'clock direction and rises, the hook 41 rotates counterclockwise and the needle The thread loop R is approached, and at this time, as shown in a of FIG. 15 , the stitch side thread Ra and the bobbin thread B of the needle thread loop R are on the rotation axis of the hum body 40 . will be located in

Then, when the hook 41 rotates further counterclockwise, as shown in FIG. 14 b, the needle thread loop R is walked so that the needle thread loop R is positioned at 10 o'clock. At this time, as shown in FIG. 15 b , the pre-stitch already implemented in the fabric becomes the supporting point, and the stitch-side thread Ra of the needle thread loop R is located in front of the bobbin thread B. As the posture is changed to be crossed, the supply-side thread Rb is disposed behind the hook 41 and the stitch-side thread Ra is disposed in front of the hook 41 so that the needle thread loop R is biased to one side.

Then, when the hook 41 is rotated further counterclockwise, as shown in FIGS. 14 c and 15 c, the supply side chamber Rb of the loop R is closed by the hook 41 . As it goes over to the other side of the bobbin case base 1, the needle thread loop R is positioned in the 7 o'clock direction.

Then, as the hook 41 rotates more counterclockwise, when the supply side thread Rb of the needle thread loop R is pulled upward by the thread take-up, d and e in FIGS. 14 and 15 d and e As shown, while the needle thread loop (R) skips the rope with respect to the bobbin case base (1), it comes out of the hook (41) and a lock stitch is implemented on the fabric.

In addition, in the rotary drum tube 100 for lock stitch of this embodiment, when the fabric is moved to the right, as shown below in FIG. 14 and below in FIG. 15 , the stitch side thread Ra of the loop R and the bobbin In the state where the thread B is positioned on the rotation axis of the hum body 40, and the hook 41 is rotated counterclockwise, the supply side thread Rb crosses the other side of the bobbin case base 1 In addition, the stitch-side thread Ra crosses one side of the bobbin case base 1 and performs a jumping rope movement with respect to the bobbin case base 1 to implement a lock stitch.

This will be described in detail with reference to the bottom of FIG. 14 as follows.

As shown in FIG. 14A, when the needle N descends in the 12 o'clock direction to make the needle thread loop R in the 12 o'clock direction and rises, the hook 41 rotates counterclockwise and the needle The thread loop (R) is approached, and at this time, as shown in FIG. 15A, the stitch side thread (Ra) and the bobbin thread (B) of the loop (R) are located on the rotation axis of the hum body (40). will become

Then, when the hook 41 rotates more counterclockwise, as shown in FIG. 14B , the needle thread loop (R) is walked so that the needle thread loop (R) is positioned in the 10 o’clock direction. At this time, as shown in FIG. 15B, the pre-stitch already implemented in the fabric becomes the supporting point so that the stitch-side thread Ra of the loop R is positioned in front of the bobbin thread B and crossed. As the posture is changed, the supply-side thread Rb is disposed behind the hook 41 and the stitch-side thread Ra is disposed in front of the hook 41 so that the loop R is biased to one side.

Then, when the hook 41 is rotated further counterclockwise, the supply side thread Rb of the needle thread loop R is attached to the hook 41 as shown in FIGS. 14 C and 15 C . As it passes over to the other side of the bobbin case base 1, the needle thread loop R is positioned in the 7 o'clock direction.

Then, when the supply side thread (Rb) of the needle thread loop (R) is pulled upward by the thread take-up as the hook 41 rotates more counterclockwise, As shown, while the needle thread loop (R) skips the rope with respect to the bobbin case base (1), it comes out of the hook (41) and a lock stitch is implemented on the fabric.

Also, as shown in FIG. 16 , even if the fabric moves to the left or right, the lockstitch is implemented on the fabric by skipping the rope in the same manner as when the fabric moves forward and backward.

Therefore, in the rotary drum barrel 100 of this embodiment, lock stitch is implemented even when the fabric is moved in all directions in a plane, and even if it is applied to an embroidery machine or a pattern sewing machine that implements 360-degree pattern stitching, the stitching quality is higher than that of the lock stitch. The posture changing means and the posture of the needle thread loop (R) that must be provided in the embroidery machine or the pattern sewing machine to prevent hitch stitches from falling not only on the fabric, but also on the rotary drum barrel applied to the conventional embroidery machine or pattern sewing machine Since the electronic control means for controlling the change means is not required, the structure of the conventional embroidery machine or pattern sewing machine is simplified, so that it is possible to provide an embroidery machine or a pattern sewing machine with remarkably low manufacturing cost and remarkably low maintenance cost.

In addition, in the rotary drum tube 100 of this embodiment, even using a needle thread made of a left-twisted yarn, the needle thread loop R is in a U-shaped posture, and the supply side thread ( Rb) is via the other side of the bobbin case base, and the stitch side thread (Ra) of the needle thread loop (R) is via one side of the bobbin case base (1), and the stitch side thread (Ra) is around the bobbin thread (B). By turning and skipping rope with respect to the bobbin case base (1), the needle thread is not additionally twisted in the left-twisting direction than in the conventional lock-stitch revolving drum, and the needle thread (sewing line) implemented in the fabric with the lock stitch is applied to the fabric. It is possible to significantly prevent wrinkles from occurring, prevent the sewing line from thickening as the left-twisted yarn is relaxed after being twisted, and minimized the diagonal line to realize clean and beautiful needlework.

The rotary drum tube 100 of the above embodiment may be provided with a disconnection preventing means to prevent the needle thread loop from being disconnected.

The short cut prevention means is disclosed in Korean Patent Application No. 10-2019-0164307, which has been filed for a patent on December 11, 2019 by the present inventor and is pending.

As applied to the revolving drum tube for hitch stitches mentioned in the prior art, the disclosed means for preventing single fire can be equally applied to the revolving drum tube of this embodiment.

This will be described with reference to FIGS. 10 to 13 as follows.

10 to 13, the rotary drum barrel of the present embodiment to which the cut-off preventing means is applied is indicated by reference numeral 100.

The rotary drum tube 100 includes: a first housing 10 mounted directly on the main body of a sewing machine, embroidery machine, or pattern sewing machine (not shown) or mounted via a bracket (not shown); a second housing 20 detachably or integrally coupled to the first housing 10 to prevent rotation of the bobbin case base 1; a power transmission rotating part (30) externally fixed to an output shaft (not shown) and rotatably inscribed in the first housing (10) about a first axis (X); And inscribed in the first housing 10 rotatably about the second axis (X') eccentric from the first axis (X) and a phase difference from the center of the second axis (X') in a part of the peripheral portion It includes a hook body 40 having a hook 41, a first step portion 42 and a second step portion 43 sequentially in the rotational direction about the second axis (X').

In order to make the bobbin case base 1 as a non-rotating body, the bobbin case base 1 is provided with a female groove 1b that is hooked on the pedestal protrusion 21 formed in the second housing 20 .

The female groove (1b) has a size and shape to contact the hook handle projection (21) with a free space in the rotational direction of the hook body (40).

The back wall of the female groove (1b) disposed at the rear in the direction in which the hook body (40) rotates, and the bobbin case base (1) when the hook body (40) rotates is the hook body (40) As shown in FIG. 17 , the contact point between the hook handle projections 21 that come into contact with the rear wall of the female groove 1b so as not to rotate with If it is positioned on the axis of rotation of the hook body 40 (on the axis of rotation of the output shaft), when the needle thread jumps rope, the hook handle 21 and the back wall of the female groove 1b of the bobbin case base 1 The needle thread loop caught between the contact parts of the liver naturally moves in the opposite direction to the rotational direction of the hook body 40 by the force of the thread take-up, so that the bobbin case base 1 does not give a load to the formation of the stitch. desirable.

An opening 24 through which the needle N and the needle thread loop R enter and exit is formed at the upper end of the second housing 20, and the opening facing in the rotating direction of the hook 41 ( 24), when the needle thread loop (R) hooked on the hook 41 performs a skipping motion with respect to the bobbin case base (1), it enters between the needle thread loops (R) and the needle thread loop ( In order to prevent the stitch side thread Ra and the supply side thread Rb of R) from being moved together to one side (power transmission side) or the other side (bobbin case base side), they protrude in the opposite direction to the rotation of the hook 41 The divided divider 25 is formed.

In addition, the hook body 40 is disposed between the first step portion 42 and the hook 41 away from the hook 41 in the rotational direction of the hook body 40 to face the hook 41 . a detent 44 extending in the direction.

The power transmission rotating part 30 continuously contacts and pushes the first step part 42 formed in the hook body 40 in the first phase section in the rotation direction of the hook body 40 to push the hook body 40 ) to rotate the first power transmission protrusion and push protrusion 31, and the second step portion 43 formed on the hook body 40 in the rotational direction of the hook body 40 continuously in the second phase section The first step 42 of the hook body 40 and the first power transmission protrusion and power transmission protrusion 31 are spaced apart by pushing with It includes a second power transmission protrusion and push protrusion 32 that stably provides a space that can be used.

When the first power transmission protrusion and push protrusion 31 transmits power to the hook body 40 in the first phase section, the first power transmission protrusion and push protrusion 31 of the hook body 40 A space through which the stitch-side thread Ra of the needle thread loop R can enter is stably provided by separating the second step 43 and the second power transmission protrusion/pushing protrusion 32 .

The first power transmission protrusion/push protrusion 31 and the second power transmission protrusion/push protrusion 32 are the other end of the flange 33 formed by protruding radially outward from the other end of the power transmission rotating unit 30 . The first power transmission protrusion and push protrusion 31 is formed on the side, and the base end is integrally coupled to the radially outer portion of the other side of the flange 33, and the front end is parallel to the first axis line (X). direction, and the second power transmission protrusion and push protrusion 32 has a phase difference with respect to the first power transmission protrusion and push protrusion 31 at the center of the first axis X, and the flange The base end is integrally coupled to the radially outer portion of the other side of (33), and the front end extends to the other side in a direction parallel to the first axis (X).

In addition, the flange 33 is disposed on the other side of the first housing 10 so that the power transmission rotating part 30 is rotatably inscribed in the through hole 11 formed in the first housing 10 . , the power transmission rotating unit disposed on one side of the first housing 10 to prevent the power transmission rotating unit 30 from moving in the direction of the first axis line (X) with respect to the first housing 10 ( An annular groove 34 is formed on the outer peripheral surface of 30), and a snap ring 12 disposed on one side of the first housing 10 having a larger outer diameter than the through hole 11 is the annular groove 34 It is circumscribed and inserted and mounted.

In addition, in a state in which the hook body 40 rotatably surrounds one side of the bobbin case base 1 and is rotatably inscribed in the through hole 22 formed in the second housing 20, the In order to prevent the hook body 40 from being moved in the direction of the second axis line X' with respect to the second housing 20, a reduced diameter portion 23 is provided on the inner peripheral surface of the through hole 22. is formed, and the hook body 40 is disposed on one side with the reduced diameter part 23 therebetween, and a gib 50 is disposed on the other side so that the hook body 40 and the gib 50 are In a state in which they are detachably coupled to each other by means of fastening means, they are rotatably inscribed in the through hole 22 .

In addition, the gib 50 is circumscribed on one side of the bobbin case base (1).

The second power transmission protrusion and push protrusion 32 has a first step portion 42 of the hook body 40 in the direction in which the first power transmission protrusion and push protrusion 31 rotates in the hook body 40 . ) is in contact with the second step portion 43 of the hook body 40 and is in a state in which power is not transmitted to the hook body 40, and the bobbin case base 1 ), the stitch side thread (Ra) of the needle thread loop (R) performing a skipping motion with respect to the first power transmission projection and push of the first step portion 42 of the hook body 40 and the power transmission rotation unit 30 When passing between the projections 31, that is, in the second phase section in the rotational direction of the hook body 40, the hook body 40 comes into contact with the second step portion 43 of the hook body 40 ) by pushing in the rotational direction to transmit power to the hook body 40, the first step portion 42 of the hook body 40 and the first power transmission projection and push projection 31 of the power transmission rotation unit 30 ) are spaced apart from each other, and between the before and after the needle thread loop (R) is released from the detent 44, the second step portion 43 of the hook body 40 is again non-contacted and the hook It is positioned at a position that does not transmit power to the body 40 .

The first power transmission protrusion and push protrusion 31 has a second step portion 43 of the hook body 40 in the rotation direction of the hook body 40 in which the second power transmission protrusion and push protrusion 32 is rotated. ) is in contact with the first step portion 42 of the hook body 40 and is in a state in which power is not transmitted to the hook body 40, and the needle thread given by the thread take-up machine The newly entering needle thread loop (R), made by That is, in the first phase section in the rotational direction of the hook body 40, the hook body 40 comes into contact with the first step portion 42 and pushes in the rotation direction of the hook body 40 to hook By transmitting power to the body 40, the second step portion 43 of the hook body 40 and the second power transmission protrusion and push protrusion 32 of the power transmission rotation unit 30 are spaced apart from each other, And in the process of the needle thread loop (R) skipping the rope, the hook body 40 does not come into contact with the first step portion 42 again, so that the position is determined so as not to transmit power to the hook body 40 . has been

In addition, when the hook body 40 is rotated by the power transmission rotating unit 30 and the power transmitting rotating unit 30 is stopped, the hook body 40 is further rotated due to inertia to prevent it from being rotated , The hook body 40 is located on the opposite side of the rotation, and in the portion of the hook body 40 facing the first step part 43, the first power when the power transmission rotating part 30 is stopped It is provided with a stopper 45 that comes into contact with the transfer projection and push projection (31).

The interval between the first step portion 43 and the stopper 45 is in the state in which the first power transmission protrusion and push protrusion 31 is interposed between the first step portion 43 and the stopper 45 . It has a length that can provide a gap through which the stitch side thread Rb of the needle thread loop R can pass.

In the revolving drum tube 100 for lock stitch configured as described above, when the lock stitch is implemented, the needle thread loop goes through the steps as shown in FIG. 13 to prevent single yarn.

When the output shaft rotates, the power transmission rotation unit 30 fixedly circumscribed on the output shaft rotates clockwise.

When the power transmission rotation unit 30 is rotated clockwise, the first power transmission projection and push projection 31 of the power transmission rotation unit 30 abuts against the first step portion 42 of the hook body 40 to hook While the body 40 rotates clockwise, the second step 43 of the hook body 40 and the second power transmission protrusion and push protrusion 32 are spaced apart, and at this time the needle N is lowered. A first step (refer to FIG. 13a ) of placing the lower upper inner side of the needle thread loop (R) at a position where it can be walked on the hook 41 is performed as it rises.

Then, as the first power transmission protrusion and push protrusion 31 continuously abuts against the first step portion 42 of the hook body 40, the hook body 40 rotates clockwise, the hook body ( 40), the gap between the second step 43 and the second power transmission protrusion and push protrusion 32 is further widened, and at this time, the needle N goes up so as not to interfere with the hook 41 and the needle thread As the loop R is stepped on the hook 41 and pulled by the hook 41, the divider 25 enters the needle thread loop R, and the second needle thread loop R is further widened. Step (see Fig. 13b) is performed.

Then, as the first power transmission protrusion and push protrusion 31 continuously abuts against the first step portion 42 of the hook body 40, the hook body 40 rotates clockwise, the hook body ( 40), the gap between the second step portion 43 and the second power transmission protrusion and push protrusion 32 is as wide as possible, and at this time, the needle thread loop (R) in which the needle (N) is hung on the hook (41) ) so as not to interfere with the skipping movement of the needle thread loop (R) hung on the hook 41 while ascending higher than the second step 43 of the hook body 40 and the second power transmission protrusion and push protrusion. (32) through the gap S1 between the stitch side thread Ra of the needle thread loop R enters one side of the bobbin case base 1 facing the power transmission rotating part, and A third step (refer to FIG. 13c ) in which the supply-side thread Rb of the needle thread loop R enters the other side of the bobbin case base 1 bearing its back on the power transmission rotating part is performed.

Then, as the second power transmission protrusion and push protrusion 32 abuts against the second step portion 43 of the hook body 40, the hook body 40 continues to rotate clockwise, the hook body 40 ) of the first step portion 42 and the first power transmission protrusion and push protrusion 31 is widened to form a gap S2, and when the hook 41 is positioned in the 7 o'clock direction, the hook 41 The stitch side thread (Ra) of the needle thread loop (R) stepped on crosses the center of one side of the bobbin case base (1) facing the power transmission rotating part (30) through the gap (S2) , At this time, the needle (N) goes up further and the supply side thread (Ra) of the needle thread loop (R) hooked on the hook (41) is started to be pulled upward by a thread take-up (not shown) in the fourth step (Fig. 13d) is performed.

Then, as the needle N moves upward, the second power transmission protrusion and push protrusion 32 continuously abuts against the second step portion 43 of the hook body 40, so that the hook body 40 ) is continuously rotated clockwise, so that the gap S2 between the first step portion 42 of the hook body 40 and the first power transmission protrusion and push protrusion 31 is maintained while the hook 41 is maintained. It is located in the 8 o'clock direction, and at this time, the stitch side thread Rb of the needle thread loop R hooked on the hook 41 is continuously pulled upward by the thread take-up, and the first power is generated in the gap S2. A fifth step (refer to FIG. 13E ) of crossing the delivery protrusion and push protrusion 31 in a counterclockwise direction is performed.

Then, as the needle N moves upward, the second power transmission protrusion and push protrusion 32 continuously abuts against the second step portion 43 of the hook body 40, so that the hook body 40 ) is continuously rotated clockwise, so that the gap S2 between the first step portion 42 of the hook body 40 and the first power transmission protrusion and push protrusion 31 is maintained while the hook 41 is maintained. It is located in the 9 o'clock direction, and at this time, while the needle thread loop (R) hooked on the hook 41 is continuously pulled upward by the thread take-up, it comes out of the hook 41 and takes over to the detent 44 . A sixth step (refer to FIG. 13f) of walking is performed.

Then, as the needle N moves upward, the first power transmission protrusion and push protrusion 31 abuts against the first step portion 42 of the hook body 40 again, and the hook body 40 continues to rotate in a clockwise direction, and a gap S1 is formed by again opening between the second step 43 of the hook body 40 and the second power transmission protrusion and push protrusion 32, and the hook 41 is When it is positioned at the 12 o'clock position, the seventh step (see FIG. 13g ) in which the needle thread loop (R) hooked on the hook 41 is pulled upward by the thread take-up and comes out of the detent 44 is carried out

Then, the first power transmission protrusion and push protrusion 31 continues to abut against the first step portion 42 of the hook body 40 so that the hook body 40 continues to rotate clockwise, and the hook body ( 40), the gap S1 between the second step part 43 and the second power transmission protrusion and push protrusion 32 is further widened, and when the hook 41 exceeds the 12 o'clock direction, the hook 41 ), while the needle thread loop (R) is continuously pulled upward by the thread take-up, an eighth step (see FIG. 13H ) in which a single lock stitch is implemented after hanging a bobbin thread (not shown) is performed.

When the output shaft is continuously rotated, the first to eighth steps are repeatedly performed so that the lock stitch is continuously implemented.

In addition, when the needle thread loop (R) performs a skipping motion with respect to the bobbin case base (1), the divider (25) moves between the stitch side thread (Ra) and the supply side thread (Rb) of the needle thread loop (R). is interposed in the needle thread loop (R), the stitch side yarn (Ra) and the supply side yarn (Rb) are prevented from moving together to one side (power transmission side) or the other side (bobbin case base side), so that the stitches are arranged in an orderly fashion is implemented

Therefore, the rotary drum barrel 100 of this embodiment has a simple structure with a minimum number of parts, and while vibration and noise are significantly reduced during sewing, while rotating the hook body at high speed, the needle thread loop (R) It is possible to implement lock stitches in all directions on a plane without single yarns, so that the efficiency of sewing work based on lock stitches can be significantly increased.

In the above embodiment, in order to guide the needle thread loop (R) when the needle thread loop (R) performs a skipping motion with respect to the bobbin case base (1), the proximal end of the hook (41) when viewed from the rotational direction of the hook body (40). It may include a friction reducing portion formed in the portion of the hook body 40 adjacent to the side.

As shown in FIGS. 10 and 11, the friction reducing part enters the other side (opposite to the power transmission side) from the portion of the hook body 40 immediately adjacent to the base end of the hook 41, and the second step part ( 43) and includes a U-shaped first cut-out 110 formed in cooperation with it.

The description of the first cut-out portion 110 and the illustration of the operating state are described in detail in the pending Korean Patent Application No. 10-2019-0111254 filed for a patent on September 9, 2009 by the present invention.

The operating state for this will be described with reference to the following.

In a state where the needle thread penetrates the hole of the needle reciprocating in the vertical direction, the needle descends to form a U-shaped open needle thread loop (R), and one side (power front side) of the needle thread loop (R) is formed. The opposite side) is arranged as the supply-side thread Rb, and the other side (power transmission side) of the needle thread loop is arranged as the stitch-side thread Ra of the unillustrated sewing material.

When the hook body 40 is rotated at a certain angle in this state, the hook 41 hangs the needle thread loop (R).

Then, when the hook body 40 is further rotated by a certain angle, the hook 41 extends the supply-side thread Rb supplied by the thread take-up machine downward while moving the needle thread loop R from the axis of rotation of the power transmission unit. It is expanded so that the stitch-side thread Ra is positioned on the proximal side of the hook 41 and reaches one side (the side facing the power transmission side) of the bobbin case base 1 .

In this state, the stitch side thread Ra comes into contact with the outer peripheral surface of the hook body 40 immediately adjacent to the base end of the hook 41, but the first cutout 110 is formed at the contact portion, so that the hook Among the both wall portions of the first cut-out portion 110 in the rotational direction of the body 40, the hook body 40 is in point contact with the downstream side wall 111 disposed on the downstream side in the rotational direction, so that the hook is significantly more hooked than in the prior art. Since the contact amount between the outer peripheral surface of the hook body 40 adjacent to the base end of (41) and the stitch-side thread (Ra) is reduced, even when the hook body is rotated at a high speed, the stitch-side thread (Ra) is separated from the first cut-out portion ( 110) in the state of minimal contact with the portion of the hook body adjacent to the base end of the hook 41, since the needle thread loop (R) jumps rope, the needle thread loop recovered by the thread take-up implemented after the skipping motion The total amount of the sum of the amount of needle thread in (R) and the amount of needle thread involved in the stitch and the thread amount of the needle thread loop provided by the thread take-up before the skipping movement are almost equal to each other, so that the stitch implemented in the sewing is made uniformly in a tensioned state.

In addition, when the stitch side thread Ra has a minimum contact surface on the outer circumferential surface of the hook body 40 adjacent to the proximal end of the hook 41, it surely crosses over to the side of the bobbin case base facing the power transmission side, It is prevented from being pinched between the housing and the bobbin case base (1), and the conventional cut or touch of the needle thread is solved.

In addition, when the stitch side thread Ra has a more minimal contact surface on the outer peripheral surface of the hook body 40 adjacent to the proximal end side of the hook 41, the side surface of the bobbin case base facing the power transmission side more reliably Overturning is further prevented from being pinched between the housing and the bobbin case base 1, so that the conventional cut or touch of the needle thread is further solved.

In the embodiment in which the single fire prevention means is applied to the rotary drum barrel, it is described that the power transmission unit 30 and the hook body 40 are rotatably mounted in the first housing 10 , but the power transmission A second axis (30) is rotatably inscribed in the first housing (10) about a first axis (X), and the hook body (40) is eccentric from the first axis (X) ( It may be inscribed in the second housing 20 rotatably about X').

In the description of the above embodiment, the lock-stitch revolving drum is described as an example of a vertical revolving drum in which the tip of the hook that steps through the needle thread loop rotates in a vertical relationship with the needle, but the present invention is not limited thereto, and the needle thread loop Since the tip of the hook walking can be applied to a horizontal rotating drumstick that rotates in a horizontal relationship with the needle or a vertical rotating drumtong for zigzag sewing, the rotating drum of this embodiment is a vertical rotating drumtong, a horizontal rotating drumtong, and a vertical rotation for zigzag sewing It should be considered as containing the north barrel.

B: bobbin thread, BS: pre-stitch, H: needle plate hole for needle, HS: hitch stitch, N: needle, Na: needle ear, O: intersection point where the rotation axis of the drive shaft or hook body and the trajectory line of the needle’s elevating movement meet , PS: Perfect Stitch, R: Needle Thread Loop, Ra: Stitch Side Thread, Rb: Supply Side Thread, S1: Gap, S2: Gap, W: Fabric, X: 1st Axis, X': 2nd Axis, x: Hook y: rotation axis, 1: bobbin case base, 1a: bobbin thread outlet, 1b: female groove, 2: needle thread guide, 3: annular rail, 4: inner hook, 5: bobbin case, 10: first Housing, 11: through hole, 12: snap ring, 20: second housing, 21: hook handle, 22: through hole, 23: shaft diameter part, 24: opening, 25: divider, 30: power transmission projection, 31: second 1 power transmission projection and push projection, 32: second power transmission projection and push projection, 33: flange, 34: annular groove, 40: hook body, 41: hook, 41a: hypotenuse, 42: first step portion, 43: 2nd step part, 44: detent, 45: stopper, 50: gib, 100: rotary drum, 110: first cut-out, 111: downstream side wall,

Claims (15)

In a state where the stitch-side thread Ra of the needle thread loop R is disposed on one side and the supply-side thread Rb is disposed on the other side, the stitch-side thread Ra of the loop R is disposed on the bobbin case base 1 . A part of the rim of the hook body 40 so that one side and the supply side chamber Rb of the loop R can cross the other side of the bobbin case base 1 and perform a skipping motion with respect to the bobbin case base 1 A structure in which the hook 41 of the hook body 40 is rotated to walk the loop (R) in the direction of advancing the fabric in the front direction of the sewing worker by the power transmission protrusion of the output shaft which revolves in contact with In the rotary drum with
The needle thread penetrates the needle ear (Na) from the other side of the bobbin case base (1) to one side, and the stitch side thread (Ra) of the needle thread loop (R) in a U-shaped posture becomes the bobbin thread (B) by the jumping rope movement. ), even if the fabric is moved in all directions on a flat surface, the needle (N), the bobbin thread outlet (1a) and the hook body (40) so that the needle thread loop supports the U-shaped posture and jumps. Revolving drum barrel capable of omnidirectional lock stitch, characterized in that the rotation center axis of the is positioned. The method of claim 1,
When thread take-up, the stitch side thread line segment of the needle thread extending from the bottom of the bobbin case base (1) to the pre-stitch is higher than the needle (N) and upper part of the bobbin case base (1) than the bobbin thread line segment extending from the bobbin thread exit to the pre-stitching. When viewed from the rotational direction of the hook 41 in the space between Revolving drum barrel with directional lockstitch. The method of claim 1,
In the direction of the rotation axis (y) of the output shaft, which is the rotation center axis of the hook body (40), the stitch side thread (Ra) of the needle thread that comes out of the needle ear (Na) and extends to the pre-stitch (BS) via the needle plate hole (H) for the needle. ) regardless of the direction of movement of the fabric, the needle (N) is positioned below the line segment of the bobbin thread (B) that extends from the exit (1a) of the bobbin thread to the pre-stitch (BS) via the needle plate hole (H). , A rotary drum tube capable of omnidirectional lock stitch, characterized in that the rotation center axis of the bobbin chamber outlet (1a) and the hook body (40) are positioned. The method of claim 1,
A rotary drum barrel capable of omnidirectional lock stitch, characterized in that the needle (N) and the bobbin thread outlet (1a) are positioned on the axis of rotation of the hook body (40). The method of claim 1,
In a state in which the ascending and descending trajectory line of the needle N is positioned to fit orthogonally to the central axis of rotation of the hook body 40, the bobbin thread outlet 1a is located in the direction of the axis of rotation of the hook body 40 In, adjacent to one side of the needle thread loop (R), on the radially outer side of the hook body (40) than the hook body (40), and on the rotation axis of the hook body (40) characterized in that it is disposed Revolving drum barrel that can lock stitch in all directions. The method of claim 1,
The hook 41 has a triangular shape with a hypotenuse facing one side and a longitudinal side extending parallel to the direction of advancing the fabric in the front direction of the sewing worker, and one end of the hypotenuse 41a meeting the vertical side is the In the direction of the rotation axis of the hook 41 of the hook body 40, it is closer to the needle N than to the stitch-side thread Ra of the loop R, and the other end of the hypotenuse 41a is the bobbin case base 1 Revolving drum tube with omnidirectional lock stitch, characterized in that it extends to one side. 5. The method of claim 4,
In order to make the bobbin case base (1) a non-rotating body, the bobbin case base (1) is provided with a female groove (1b) that is hooked on the hook-and-loop protrusion (21) as a fixed body,
The female groove (1b) has a size and shape to contact the hook handle projection (21) with a free space in the rotational direction of the hook body (40),
The back wall of the female groove (1b) disposed at the rear in the direction in which the hook body (40) rotates, and the bobbin case base (1) when the hook body (40) rotates is the hook body (40) The contact point between the hook handle projections 21, which comes into contact with the rear wall of the female groove 1b to prevent rotation with Revolving drum barrel capable of omnidirectional lockstitch, characterized in that there is. The method of claim 1,
A first housing (10) mounted on the body,
A second housing 20 coupled to the first housing 10 and having a bobbin case base 1, which is a non-rotating body, built-in;
A power transmission rotating unit 30 coupled to the output shaft and rotatably inscribed in the first housing 10 about the first axis X, and
It is inscribed in the first housing 10 rotatably about a second axis X' eccentric from the first axis X and has a phase difference from the center of the second axis X' in a portion of the circumference It includes a hook body 40 having a hook 41, a first step portion 42 and a second step portion 43 sequentially in the rotational direction about the second axis (X'),
The power transmission rotating part 30 is in contact with the first step part 42 formed on the hook body 40 in the first phase section in the rotation direction of the hook body 40 to push the hook body 40 . The first power transmission protrusion and push protrusion 31 to rotate, and the second step portion 43 formed on the hook body 40 in a second phase section in the direction of rotation of the hook body and push to contact and push the hook body A second second providing a space through which the stitch-side thread Ra of the needle thread loop R can escape by separating the first step portion 42 of (40) and the first power transmission protrusion/pushing protrusion 31 It includes a power transmission protrusion and push protrusion 32,
When the first power transmission protrusion and push protrusion 31 transmits power to the hook body 40 in the first phase section, the first power transmission protrusion and push protrusion 31 of the hook body 40 A lock characterized in that it provides a space through which the stitch side thread (Ra) of the needle thread loop (R) can enter by separating the second step portion (43) and the second power transmission protrusion/pushing protrusion (32) Revolving drumbox for stitching. 9. The method of claim 8,
The hook body 40 is disposed between the first step portion 42 and the hook 41 away from the hook 41 in the rotational direction of the hook body 40 and faces the hook 41 . Lockstitch rotary drum, characterized in that it comprises a detent (44) extending to. 10. The method of claim 9,
The second power transmission protrusion and push protrusion 32 is in a state in which power is not transmitted to the hook body 40 because it is not in contact with the second step portion 43 of the hook body 40 in the first phase section. The stitch side thread (Ra) of the needle thread loop (R) that is in the jumping rope movement with respect to the bobbin case base (1) is the first step portion (42) of the hook body (40) and the power transmission rotating part ( In the second phase section in the rotational direction of the hook body 40 when passing between the first power transmission protrusion and push protrusion 31 of 30), the second step portion 43 of the hook body 40 ) in contact with the hook body 40 by pushing it in the rotational direction to transmit power to the hook body 40, the first step portion 42 of the hook body 40 and the first of the power transmission rotation unit 30 The second step portion ( 43) and is positioned at a position that does not transmit power to the hook body 40 by contacting again, and
The first power transmission protrusion and push protrusion 31 is non-contact with the first step portion 42 of the hook body 40 in the second phase section to transmit power to the hook body 40 The second power of the second step part 43 of the hook body 40 and the power transmission rotation part 30 of the hook body 40, the needle thread loop (R) newly entering made with the needle thread given by the thread take-up after being in the state In the first phase section in the rotational direction of the hook body 40 when entering between the transmission protrusion and push protrusion 32, it is in contact with the first step portion 42 of the hook body 40 and the hook body ( 40) to transmit power to the hook body 40 by pushing it in the rotational direction, and the second power transmission protrusion and push protrusion of the second step part 43 of the hook body 40 and the power transmission rotation part 30 ( 32) are spaced apart from each other, and in the process of the needle thread loop (R) skipping rope, the hook body 40 is not in contact with the first step part 42 again to apply power to the hook body 40. Revolving drum barrel for lockstitch, characterized in that it is positioned at a position not to transmit. 9. The method of claim 8,
The first power transmission protrusion/push protrusion 31 and the second power transmission protrusion/push protrusion 32 are the other end of the flange 33 formed by protruding radially outward from the other end of the power transmission rotating unit 30 . The first power transmission protrusion and push protrusion 31 is formed on the side, and the base end is integrally coupled to the radially outer portion of the other side of the flange 33, and the front end is parallel to the first axis line (X). direction, and the first power transmission protrusion and push protrusion 32 has a phase difference with respect to the first power transmission protrusion and push protrusion 31 at the center of the first axis X, and the flange (33) The base end is integrally coupled to the radially outer portion of the other side, and the front end extends to the other side in a direction parallel to the first axis (X). 12. The method of claim 11,
In a state in which the flange 33 is disposed on the other side of the first housing 10 so that the power transmission rotating part 30 is rotatably inscribed in the through hole 11 formed in the first housing 10, the To prevent the power transmission rotating part 30 from moving in the direction of the first axis line (X) with respect to the first housing (10),
An annular groove 34 is formed on an outer circumferential surface of the power transmission rotating part 30 disposed on one side of the first housing 10 , and has an outer diameter larger than that of the through hole 11 , and the first housing 10 ), a snap ring 12 disposed on one side is externally circumscribed in the annular groove 34 and is inserted and mounted,
In a state in which the hook body 40 rotatably surrounds one side of the bobbin case base 1 and is rotatably inscribed in the through hole 22 formed in the second housing 20, the hook body (40) to prevent movement in the direction of the second axis (X') with respect to the second housing (20),
A reduced diameter portion 23 is formed on the inner circumferential surface of the through hole 22, the hook body 40 is disposed on one side with the reduced diameter portion 23 interposed therebetween, and a bobbin case base (1) ), the gib 50 circumscribed on one side is disposed on the other side so that the hook body 40 and the gib 50 are rotatable in the through hole 22 in a state in which the hook body 40 and the gib 50 are detachably coupled to each other by a fastening means. Revolving drum barrel for lock stitch, characterized in that it is inscribed. 9. The method of claim 8,
An opening 24 for the needle and needle thread loop R to enter and exit is formed at the upper end of the second housing 20 , and the opening 24 facing in the rotational direction of the hook 41 is formed. At the site, when the needle thread loop (R) hooked on the hook (41) performs a skipping motion with respect to the bobbin case base (1), it enters between the needle thread loops (R). In order to prevent the stitch side thread Ra and the supply side thread Rb from moving together to one side (power transmission side) or the other side (bobbin case base side), a divider protruding in the opposite direction to the rotation of the hook 41 ( 25) is a rotary drum barrel for lock stitching, characterized in that it is formed. 9. The method of claim 8,
In order to guide the needle thread loop (R) when the needle thread loop (R) performs a skipping motion with respect to the bobbin case base (1), the hook adjacent to the proximal side of the hook (41) when viewed from the rotational direction of the hook body (40) It includes a friction reducing part 100 formed on the part of the body 10,
The friction reducing unit 100 enters the other side (opposite side of the power transmission side) from the portion of the hook body 40 immediately adjacent to the base end of the hook 41 and cooperates with the second step portion 43 to form a U-shape. Revolving drum tube for lock stitch, characterized in that it comprises a first cut-out portion (110). 9. The method of claim 8,
The hook body 40 is located on the opposite side to which the hook body 40 rotates and is located in a portion of the hook body 40 facing the first step part 43, the power transmission rotating part 30 of and a stopper 45 that comes into contact with the first power transmission protrusion and push protrusion 31 at the time of stopping,
The interval between the first step portion 43 and the stopper 45 is in the state in which the first power transmission protrusion and push protrusion 31 is interposed between the first step portion 43 and the stopper 45 . A revolving drum for lock stitch, characterized in that it has a length that can provide a gap through which the stitch side thread (Ra) of the needle thread loop (R) can pass.

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