KR102529789B1 - rotating shuttle - Google Patents

Abstract

The present invention, in a state in which the power transmission rotating part rotates at the first center and the hook body rotates at the second center, the first step formed on the hook body in the first phase section in the rotational direction of the hook body The first power transmission protrusion that rotates the hook body by pushing and non-contacts the first stepped portion formed on the hook body in the second phase section in the rotational direction of the hook body to transmit power to the hook body. Provided on the rotating part, and with a phase difference between the first stepped part at the first center and pushing the second stepped part formed on the hook body in the second phase section in the rotational direction of the hook body, the first stepped part of the hook body and the above It relates to a revolving drum cylinder having a second power transmission protrusion provided on the power transmission rotation unit to provide a space for the upper thread on the stitch side of the loop to escape by widening the space between the first power transmission protrusion.

Description

rotating shuttle {rotating shuttle}

The present invention relates to a revolving drum cylinder, and more particularly, to a revolving drum cylinder capable of selectively implementing a lock stitch and a hitch stitch according to the position of a lower thread and preventing single yarns.

)와 히치 스티치(

) 가 있다.A stitch implemented using a drum drum provided in a sewing machine or embroidery machine includes a perfect switch, a lock stitch (

) and hitch stitch (

) is there.

In the conventional rotary drum cylinder for lock stitch, since one end of the drive shaft is fixed to the center of the rotary hook body, one side of the bobbin case base facing the drive shaft in the direction of the rotation axis of the drive shaft is blocked by the drive shaft and The other side of the bobbin case base carrying the back is open. Therefore, the U-shaped loop of the needle thread (upper thread) in which the supply side thread and the stitch side thread extend in the vertical direction can jump rope across the supply side thread and the stitch side thread along the other side and one side of the bobbin case base without changing the position. does not exist.

Therefore, in order for the U-shaped loop of the needle thread (upper thread) to jump rope with respect to the bobbin case base 1, as shown in FIGS. 1 to 4, the supply side thread Rb and the stitch side thread Ra In a state in which the posture is changed to extend in the axial direction of the drive shaft by the hook 41, the stitch side thread Ra on the outer surface of the hook 41 moves toward the other side surface of the bobbin case base 1, and the bobbin case base ( It is possible to jump rope with respect to the bobbin case base 1 by riding across the other side of 1).

The supply side chamber (Rb) on the inner surface of the hook 41 moves toward the other side of the bobbin case base 1, crosses the other side of the bobbin case base 1, and rides over the bobbin case base 1 Even if the rope is skipped, since the supply side yarn Rb is still on the inner surface of the hook 41, it cannot escape from the hook 41, and it is impossible to form stitches on the fabric in that state.

On the other hand, in order for the stitch side thread (Ra) on the outer surface of the hook 41 to jump rope smoothly with respect to the bobbin case base 1, the stitch side thread (Ra) in the rotational direction of the hook 41 is the supply side thread (Rb) It needs to be placed in the front.

To this end, in the conventional drum drum for lock stitch, as shown in FIG. 2, the needle thread guide 2 is spaced apart from the annular rail 3 and radially outward with respect to the hook 41 Arranged adjacent to the hook 41, the loop R of the needle thread can no longer move in the direction opposite to the rotation of the hook 41, so that the supply side thread Rb in the rotation direction of the hook 41 is the stitch side thread ( Ra), and in this state, when the hook 41 rotates further, as shown in FIG. 3, the stitch side thread Ra of the needle thread moves through the needle thread guide 2 and the hook 41. As it enters the gap between the hooks 41, the stitch side thread Ra is positioned ahead of the supply side thread Rb in the rotational direction of the hook 41, and the posture is changed.

In addition, in the conventional drum drum for lock stitch, the supply side thread Rb located on the inner surface of the hook 41 prevents the loop R of the needle thread from moving further in the rotational direction of the hook 41. As shown in 3, the inner hook 4 is provided between the hook 41 and the annular rail 3, and the stitch side thread Ra is in front of the supply side thread Rb in the rotational direction of the hook 41 Positioned, the needle thread jumps rope with respect to the bobbin case base 1 in a state in which the stitch side thread Ra and the supply side thread Rb have loops R crossed with each other as a whole.

The revolving drum for lockstitch having such a structure implements lockstitch by manipulating the bobbin thread and the needle thread, as shown in FIG. 4 .

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 a state in which the stitch side thread (Ra) of R) is set to be sequentially arranged in the direction of the drive shaft in 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 loop (R) of the needle thread is hooked to the hook 41 in a state located in front (bobbin case side).

In this state, when the hook 1 is further rotated counterclockwise, as shown in FIGS. 1 to 3, the supply side thread Rb of the needle thread and the stitch side thread Ra of the needle thread cross each other, As shown in (c) of FIG. 4, while the position of the loop R of the needle thread is changed in an X shape, as seen in FIG. 4, the stitch side thread Ra of the needle thread is the supply side thread Rb of the needle thread. In the state of being positioned forward (front in the counterclockwise direction), the stitch side thread (Ra) of the needle thread goes around the bobbin thread (B) to the front side of the bobbin case base (1).

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

5 Left-twist needle thread as shown in is used.

If the needle thread of coincident thread as shown in FIG. 5 is used in the conventional rotation drum for lock stitch, the needle thread of the coincident thread is loosened, and the thickness of the needle thread increases, so that when passing through the needle hole, the inner surface of the needle hole and Friction between needle threads increases, resulting in disconnection.

However, even if left-twist needle thread is used in the conventional rotation drum for lock stitch, in a state where the left-twist needle thread (upper thread) is changed from a U-shaped loop to an X-shaped loop, the stitch of the needle thread As the side thread (Ra) is further twisted in the direction of the left twisted yarn, it goes over the outer surface of the hook (41) and the other side of the bobbin case base (1) and jumps over the bobbin case base (1) to form a lock stitch on the fabric. After one stitch tensed in the left-twist direction is finished sewing, as the tensioned twisted state is relaxed, wrinkles are generated in the fabric near the lock stitch by the lock stitch, so there are many wrinkles in the fabric near the lock stitch seam. have

In addition, in the conventional rotation drum for lock stitch, the bobbin thread is located in front of the needle thread in the direction of movement of the fabric, and as shown in FIG. 4, when the hook 41 rotates counterclockwise, the lock stitch is implemented , It is known that hitch stitching is realized when the original fabric is moved backward in this state. For this reason, when a conventional rotary drum drum for lock stitch is applied to sewing in which only a lock stitch is to be uniformly implemented, a hitch stitch that reduces the uniformity of stitches in the backward section of the fabric is implemented.

Therefore, in order to prevent the occurrence of wrinkles and hitch stitches that impair sewing uniformity in the conventional rotation drum for lock stitch, the needle thread loop does not jump rope with respect to the bobbin case base in the X-shaped loop state, and forms a U-shaped loop. In the loop state, skipping rope movement should be performed against the bobbin case base.

However, in the conventional revolving drum for lock stitch, 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 toward the other side of the bobbin case base (1), thereby bobbin case base When the skipping motion is performed for (1), the stitch side thread (Ra) of the needle thread loop is blocked by the driving shaft, so that the needle thread loop (R) cannot jump rope with respect to the bobbin case base.

As a result, in order to make the U-shaped loop of the needle thread jump rope, there is no choice but to use the rotary drum for hitch stitching proposed in Korean Patent Registration No. 1955451, which has been patented and registered by the present inventor.

In the rotary drum cylinder for hitch stitching presented above, in a state where the needle thread loop has a U-shaped posture, the supply side thread rides over the other side of the bobbin case base, and the stitch side thread goes over one side of the bobbin case base. After the bobbin thread crosses with the stitch side thread to change its position into an X-shaped loop while hanging the bobbin thread, a hitch stitch is realized by the thread take-up in the opposite direction to the fabric advancing direction in the state in which the fabric is moving forward, and in this state, when the fabric moves backward, A lockstitch can be implemented.

However, when a conventional rotation drum drum for lock stitch is applied to sewing in which only hitch stitches are to be uniformly implemented in sewing in which a fabric can be moved forward and backward, a lock stitch that reduces the uniformity of stitches in the backward section of the fabric is implemented.

The above-described stitch type conversion rule according to the position of the fabric running direction and the bobbin thread and needle thread in the conventional lock-stitch rotary drum cylinder and the fabric running direction, bobbin thread, and needle thread of the hitch stitch rotary drum cylinder invented by the present inventor Considering the above-mentioned stitch type conversion rule according to the position of the present inventor, if the hitch stitch rotary drum cylinder invented by the present inventor is improved, lock stitch and hitch stitch are formed as the fabric moves forward and backward. It has been found that the first case, the second case in which hitch stitches and lock stitches are formed, the third case in which only lock stitches are formed, and the fourth case in which only hitch stitches are formed can be implemented.

However, in the rotary drum cylinder for hitch stitch disclosed in Patent Registration No. 10-1657607 filed by the present inventor, the stitch of the loop between the part of the hook body that contacts the power transmission projection in the circumferential direction of the hook body and the power transmission projection It has a structure in which the side upper thread squeezes in and widens to create an escape space and escape through it, so when the hook body rotates at high speed, the loop of the upper thread receives a large load from the power transmission projection rotating at high speed, This has caused a problem that the loop becomes single yarn and the hitch stitch cannot be continuously implemented.

A rotary drum cylinder for hitch stitching to solve this problem is disclosed in Korean Patent Registration No. 10-2018598.

The hitch-stitch rotary drum cylinder disclosed above is a part of the hook body that contacts the power transmission protrusion in the circumferential direction of the hook body in the basic structure of the rotary drum cylinder disclosed in Patent No. 10-1657607 filed by the present inventor and power When the upper thread on the stitch side of the loop is squeezed between the transfer protrusions, the part of the hook body in contact with the power transmission protrusion is temporarily moved with respect to the power transmission protrusion in the direction in which the power transmission protrusion rotates, so that the upper thread on the stitch side of the loop The above problem could be solved by providing a single yarn prevention means for creating an escape space.

The single yarn prevention means may include a second stepped portion extending toward one side at a portion of an edge of the hook body spaced apart from the stepped portion of the hook body toward the rotational direction of the hook body; and during the eccentric rotational movement, the hook body can be moved by a predetermined angle in the direction of rotation of the hook body in contact with the second stepped portion without disturbing the upper thread of the loop to be stitched by jumping rope. It is positioned at a position where it is located and includes a widening portion having a push protrusion extending in the other direction to face the second stepped portion in the rotational direction across the power transmission rotating portion.

However, in a state where the power transmission protrusion and the hook body rotate in the first center, the beveled portion of the single yarn prevention means rotates in the second center eccentric to the first center, and periodically contacts and pressurizes the hook body. , The power transmission protrusion and the hook body when vibration and noise of the bevel portion, which are inevitably generated in the course of rotation of the bevel portion being eccentric to the first center, contact the power transmission protrusion and the bevel portion with respect to the hook body. There was a problem that vibration and noise were further amplified.

The present invention has an object to solve the above-mentioned problems.

In the present invention, in a state in which the power transmission rotating part rotates at the first center and the hook body rotates at the second center, the first stepped portion formed on the hook body in the first phase section in the rotational direction of the hook body to continuously contact and push to rotate the hook body, and to continuously non-contact the first stepped portion formed on the hook body in the second phase section in the rotational direction of the hook body to transmit power to the hook body. 1 power transmission protrusion and push protrusion are provided in the power transmission rotation part, and the second phase section formed in the hook body is formed in the second step part in the rotation direction of the hook body with a phase difference in the first step part from the first center 2nd power transmission protrusion and push to stably provide a space where the upper thread on the stitch side of the loop can escape by continuously contacting and pushing to widen the gap between the first stepped portion of the hook body and the first power transmission protrusion and push protrusion. A protrusion is provided on the power transmission rotating part, and when the first power transmission protrusion and push protrusion transmits power to the hook body in the first phase period, the first power transmission protrusion and push protrusion is the second power transmission protrusion and push protrusion of the hook body. The above problem can be solved by stably providing a space into which the roof can enter by widening the gap between the stepped portion and the second power transmission/push protrusion.

The present invention, by means of the above problem solving means, in order to prevent single yarn in the prior art, the power transmission rotation part and the hook body are excluded from the bulging part as a separate part, and the push protrusion conventionally provided in the bulging part is used as the power transmission rotation part Provided in, the number of parts is reduced, the structure is simplified, vibration and noise are significantly reduced during sewing, while rotating the hook body at high speed, without breaking the loop of the upper thread, the exit position of the lower thread Accordingly, it is possible to implement at least one of a lock stitch and a hitch stitch in the forward and backward direction of the fabric, so that the efficiency of the sewing operation can be remarkably increased.

1 is a conceptual diagram showing the entry of a hook into a needle thread loop in a conventional drum drum for lock stitch;
2 is a conceptual diagram showing a state in which the needle thread loop of FIG. 1 is prevented from moving in a direction opposite to the rotational direction of the hook by the hook and the needle thread guide;
3 is a conceptual diagram 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 the steps in which a lock stitch is implemented by a conventional rotation drum for lock stitch;
5 is a conceptual diagram showing left-sided and coincident verbs;
6 is an exploded perspective view showing a revolving drum cylinder according to an embodiment of the present invention;
7 is a perspective view of the revolving drum cylinder of FIG. 6 from the opposite side;
Figure 8 is a combined perspective view of Figure 6;
9 is the position of the first power transmission protrusion and push protrusion and the second power transmission protrusion and push protrusion of the power transmission rotation unit when the output shaft is rotated in the rotary drum cylinder of FIG. 6, and the first step and the second step of the hook body A conceptual diagram showing different phase differences,
10 is a schematic diagram showing the step of implementing a lock stitch by a revolving drum cylinder according to an embodiment of the present invention when sequentially 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, and
Figure 11 is a schematic diagram showing the step of implementing a lock stitch by a revolving drum cylinder according to an embodiment of the present invention when the bobbin case base is sequentially viewed from above in a state in which the fabric is moving forward and in a state in which the fabric is retracting.

Hereinafter, a revolving drum drum of an embodiment according to the present invention will be described in detail with reference to FIGS. 6 to 11.

6 to 8, the revolving drum drum of this embodiment is indicated by reference numeral 100.

In the following description of the revolving drum cylinder, one side means the power transmission side, and the other side means the bobbin case base side to which the bobbin case shown in FIGS. 6 and 7 is detachably mounted without a sign.

The revolving drum cylinder 100 includes a first housing 10 that is directly mounted to the main body of a sewing machine or embroidery machine (not shown) or is mounted via a bracket (not shown); a second housing 20 that is detachably or integrally coupled to the first housing 10 and is embedded in the bobbin case base 1 so as not to rotate; A power transmission rotation unit 30 fixedly circumscribed to an output shaft (not shown) and rotatably inscribed on a first guide rail L1 of the first housing 10 about a first axis line X; And rotatably about a second axis line (X') eccentric from the first center, inscribed in the second guide rail (L2) of the first housing (10), and a part of the circumference of the second axis line (X'). Hook 41 sequentially in the rotational direction about the second axis line (X ') with a phase difference at the center; It includes a hook body 40 having a first stepped portion 42 and a second stepped portion 43.

In order to make the bobbin case base 1 a non-rotating body, the bobbin case base 1 can be coupled to the protrusion 21 formed on the second housing 20 or to a known not shown hook holder. there is.

An opening 24 is formed at the upper end of the second housing 20 for the needle and upper thread loop R to enter and exit, and the portion of the opening 24 facing in the rotational direction of the hook 41 In this case, when the upper thread loop (R) hooked on the hook (41) jumps rope with respect to the bobbin case base (1), it enters between the loops (R) of the upper thread and the stitch side of the upper thread loop (R) Divider 25 protruding in the opposite direction of rotation of the hook 41 to prevent the upper thread (Ra) and the upper thread (Rb) from being moved together to one side (power transmission side) or the other side (bobbin case base side) ) 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, facing the hook 41 It includes a detent 44 extending in the direction.

The power transmission rotating part 30 continuously contacts and pushes the first stepped part 42 formed on the hook body 40 in the first phase section in the rotational direction of the hook body 40, thereby pushing the hook body 40 ) in the second phase section in the rotational direction of the hook body to the first power transmission and push protrusion 31 and the second stepped portion 43 formed on the hook body 40, By pushing to spread the space between the first stepped portion 42 of the hook body 40 and the power transmission protrusion 31, the stitch side upper thread Ra of the upper thread loop R can stably provide a space to escape It includes 2 power transmission projections and push projections 32.

When the first power transmission protrusion/push protrusion 31 transmits power to the hook body 40 in the first phase period, the first power transmission protrusion/push protrusion 31 transmits power to the hook body 40. The gap between the second stepped portion 43 and the second power transmission/push protrusion 32 is widened to stably provide a space into which the upper thread Ra of the stitch side of the upper thread loop R can enter.

The first power transmission protrusion and push protrusion 31 and the second power transmission protrusion and push protrusion 32 are the other side of the flange 33 formed to protrude radially outward from the other end side of the power transmission rotation part 30. It is formed on the side, but the first power transmission protrusion and push protrusion 31 has a base end integrally coupled to the outer portion in the radial direction of the other side surface of the flange 33 and the front end is parallel to the first axis line (X). direction to the other side, 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 line X and the flange The base end is integrally coupled to the radially outer portion of the other side surface of (33), and the tip extends to the other side in a direction parallel to the first axis line (X).

In addition, in a state where the flange 33 is disposed on the other side of the first housing 10 and the power transmission rotation unit 30 is rotatably accommodated in the first housing 10, the power transmission rotation unit 30 An annular groove ( 34) is formed, and the snap ring 12 disposed on one side of the first housing 10 has a larger outer diameter than the through hole 11 formed in the first housing 10, and the annular groove 34 It is circumscribed and inserted into.

In addition, in a state in which the hook body 40 rotatably surrounds one side of the bobbin case base 1 and is rotatably embedded in the through hole 22 formed in the second housing 20, the In order to prevent the hook body 40 from moving in the direction of the second axis line X 'with respect to the second housing 20, a reduced diameter portion 23 having a reduced radius is provided on the inner circumferential surface of the through hole 22 formed and/or the second guide rail L2 is formed stepwise on the inner circumferential surface of the first housing 10, and the diameter reduction portion 23 and/or the second guide rail L2 are interposed therebetween. In a state where the hook body 40 is disposed on one side and a gib 50 is disposed on the other side so that the hook body 40 and the gib 50 are detachably coupled to each other by a fastening means, It is rotatably internally connected to the through hole 22 .

If the second guide rail L2 is formed stepwise on the inner circumferential surface of the first housing 10, the diameter reducing portion 23 may be excluded from the inner circumferential surface of the through hole 22 of the second housing 20. And if the second guide rail (L2) is formed on the inner circumferential surface of the second housing 20 without a step, the diameter reduced portion 23 on the inner circumferential surface of the through hole 22 of the second housing 20 may be formed.

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

The second power transmission protrusion and push protrusion 32 is the first step portion 42 of the hook body 40 in the rotational direction of the hook body 40 when the first power transmission protrusion and push protrusion 31 ) is in contact with the second stepped portion 43 of the hook body 40 and is in a state in which power is not transmitted to the hook body 40, and then the bobbin case base 1 ), the upper thread (Ra) on the stitch side of the upper thread loop (R) skipping rope with respect to the first step portion 42 of the hook body 40 and the first power transmission protrusion and push of the power transmission rotating portion 30 When passing between the protrusions 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 ) to transmit power to the hook body 40 by pushing in the rotational direction of 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 rotating portion 30 ) are spaced apart from each other, and the upper thread loop (R) is non-contacted with the second stepped portion 43 of the hook body 40 again between the front and back of the detent 44 being released, so that the hook body It is positioned at a position not to transmit power to (40).

The first power transmission protrusion and push protrusion 31 is the second step portion 43 of the hook body 40 in the rotational direction of the hook body 40 when the second power transmission protrusion and push protrusion 32 ) is in contact with the first step portion 42 of the hook body 40 and is in a state where power is not transmitted to the hook body 40, and then as an upper thread given by the take-up When the newly created upper thread loop (R) enters between the second step portion 43 of the hook body 40 and the second power transmission protrusion and push protrusion 32 of the power transmission rotating portion 30 That is, in the first phase section in the rotation direction of the hook body 40, the hook body ( 40), so that the second stepped portion 43 of the hook body 40 and the second power transmission projection cum push projection 32 of the power transmission rotation portion 30 are spaced apart from each other, and the While the upper thread loop (R) jumps rope, it is positioned at a position where power is not transmitted to the hook body (40) by being non-contacted with the first stepped portion (42) of the hook body (40) again.

In addition, the hook body 40 is rotated by the power transmission rotation unit 30, and when the power transmission rotation unit 30 stops, the hook body 40 is further rotated by inertia To prevent , At the part of the hook body 40 located on the opposite side of the rotation of the hook body 40 and facing the first stepped portion 42, the first power when the power transmission rotating portion 30 is stopped It is provided with a stopper 45 that comes into contact with the transmission protrusion and push protrusion 31.

The distance between the first stepped portion 42 and the stopper 45 is determined by the first power transmission protrusion and push protrusion 31 being interposed between the first stepped portion 42 and the stopper 45. A gap through which the upper thread (Ra) on the stitch side of the upper thread loop (R) can pass It is of any length that can be provided.

As shown in FIG. 9, the revolving drum cylinder 100 configured as described above implements stitches through steps.

When the output shaft (not shown) rotates, the power transmission rotation unit 30 fixedly circumscribed to the output shaft rotates clockwise.

When the power transmission rotation unit 30 is rotated clockwise, the first power transmission protrusion and push protrusion 31 of the power transmission rotation unit 30 abuts against the first stepped portion 42 of the hook body 40 to hook While causing the body 40 to rotate clockwise, the gap between the second stepped portion 43 of the hook body 40 and the second power transmission and push protrusion 32 is widened, and at this time, the needle N descends The first step (see FIG. 9A) is performed to place the lower upper inner side of the upper thread loop (R) made while lifting and then being positioned at a position where it can be hooked to the hook 41.

Then, the first power transmission protrusion and push protrusion 31 continuously comes into contact with the first stepped portion 42 of the hook body 40 so that the hook body 40 rotates clockwise, the hook body ( 40), the gap between the second step portion 43 and the second power transmission projection/push projection 32 is further widened, and at this time, the needle N goes up so as not to interfere with the hook 41, and the upper thread loop (R) is hooked to the hook 41 and dragged by the hook 41, and the divider 25 enters the upper thread loop R, so that the upper thread loop R is further widened. The second step ( 9b) is performed.

Then, the first power transmission protrusion and push protrusion 31 continuously comes into contact with the first stepped portion 42 of the hook body 40 so that the hook body 40 rotates clockwise, the hook body ( 40), the gap between the second step portion 43 and the second power transmission/push protrusion 32 is maximally widened, and at this time, the upper thread loop (R) where the needle (N) is hooked to the hook (41) The upper thread loop (R) hooked on the hook (41) while going up so as not to interfere with the jumping rope movement of the second step portion (43) of the hook body (40) and the second power transmission projection and push projection (32) ) through the gap (S1) between the upper thread loops (R) on the stitch side of the upper thread (Ra) to enter one side of the bobbin case base (1) facing the power transmission rotation unit and the upper thread loop A third step (see FIG. 9c) is performed in which the supply-side upper thread Rb of (R) enters the other side of the bobbin case base 1 having its back to the power transmission rotating unit.

Then, the second power transmission protrusion and push protrusion 32 abuts against the second stepped portion 43 of the hook body 40, so that the hook body 40 continues to rotate clockwise, the hook body 40 ), the gap S2 is formed between the first stepped portion 42 and the first power transmission projection and push projection 31, and the hook 41 is located at 7 o'clock, the hook 41 The stitch-side upper thread (Ra) of the upper thread loop (R) crosses the center of one side of the bobbin case base (1) facing the power transmission rotation unit (30) through the gap (S2), , At this time, as the needle N goes up, the supply-side upper thread Rb of the upper thread loop R hooked on the hook 41 by a thread take-up (not shown) starts to be pulled upward (FIG. 9d reference) is performed.

Then, as the needle N goes up, the second power transmission protrusion and push protrusion 32 continuously comes into contact with the second stepped portion 43 of the hook body 40, thereby hooking the hook body 40 ) is continuously rotated clockwise, and the gap (S2) between the first stepped portion 42 of the hook body 40 and the first power transmission projection and push projection 31 is maintained. Hook 41 Located in the 8 o'clock direction, at this time, while the stitch-side upper thread Ra of the upper thread loop R hooked on the hook 41 is continuously pulled upward by the thread take-up, the first power in the gap S2 A fifth step (see FIG. 9e) of crossing the transmission protrusion and push protrusion 31 in a counterclockwise direction is performed.

Then, as the needle N goes up, the second power transmission protrusion and push protrusion 32 continuously comes into contact with the second stepped portion 43 of the hook body 40, thereby hooking the hook body 40 ) is continuously rotated clockwise, and the gap (S2) between the first stepped portion 42 of the hook body 40 and the first power transmission projection and push projection 31 is maintained. Hook 41 Located in the 9 o'clock direction, at this time, while the upper 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 is taken over by the stopper 44 A sixth step (see FIG. 9F) of being walked is performed.

Then, as the needle N goes up, the first power transmission protrusion and push protrusion 31 again abuts on the first stepped portion 42 of the hook body 40, thereby causing the hook body 40 to is continuously rotated clockwise to form a gap S1 again between the second stepped portion 43 of the hook body 40 and the second power transmission protrusion and push protrusion 32, and the hook 41 When located at 12 o'clock, the upper thread loop (R) hooked on the hook 41 is continuously pulled upward by the thread take-up, and the seventh step (see FIG. 9g) is performed to come out of the detent 44 do.

Then, the first power transmission protrusion and push protrusion 31 continues to come into contact with the first stepped portion 42 of the hook body 40 so that the hook body 40 continues to rotate clockwise, so that the hook body ( 40), the gap (S1) between the second step portion 43 and the second power transmission projection and push projection 32 is further widened, and when the hook 41 exceeds the 12 o'clock direction, the hook 41 ), while the upper thread loop R is continuously pulled up by the thread take-up, the eighth step (see FIG. 9h) is performed in which one stitch is implemented by hanging the lower thread (not shown).

When the output shaft is continuously rotated, the first to eighth steps described above are repeatedly performed so that stitches are continuously implemented.

In addition, when the upper thread loop (R) skips rope with respect to the bobbin case base (1), the divider (25) moves between the upper thread (Ra) on the stitch side and the upper thread (Rb) on the supply side of the upper thread loop (R). interposed therebetween, preventing both the upper thread (Ra) on the stitch side and the upper thread (Rb) on the supply side of the upper thread loop (R) from being moved to one side (power transmission side) or the other side (bobbin case base side), and the stitches are implemented in an orderly manner. do.

Therefore, in the revolving drum cylinder 100 of this embodiment, in order to prevent single yarn in the prior art, the beveling portion, which is a separate part for the power transmission rotating portion and the hook body, is excluded, and the beveling protrusion, which was conventionally provided in the beveling portion, is the power transmission rotating portion It is replaced with a second power transmission protrusion and push protrusion, so the number of parts is reduced, the structure is simplified, and vibration and noise during sewing are significantly reduced, while rotating the hook body at high speed, the upper thread loop (R) is single yarn ( Since it is possible to implement stitches without stitching, the efficiency of the sewing operation can be remarkably increased.

In an embodiment in which the single yarn prevention means is applied to the revolving drum cylinder, the power transmission unit 30 is rotatably inscribed on the first guide rail L1 of the first housing 10 about the first axis line X. And, the hook body 40 is rotatably centered on the second axis line (X ') eccentric from the first axis line (X). Although described as having been described, the present invention is not limited thereto, and the power transmission unit 30 and the hook body 40 are attached to each of the first and second housings 10 and 20 or the second housing 20 may be mounted eccentrically to each other, and when mounted eccentrically to each of the first and second housings 10 and 20, the amount of eccentricity between the power transmission unit 30 and the hook body 40 is the first And when the second housings 10 and 20 are coupled to each other, it can be changed, which is not preferable than the above embodiment.

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

The friction reducing portion enters the other side (opposite side of the power transmission side) from the portion of the hook body 40 immediately adjacent to the proximal end of the hook 41 and cooperates with the second step portion 43. U-shaped first cutout formed (110).

In addition, the friction reducing part includes a U-shaped second cutout 120 formed to enter the other side (opposite side of the power transmission side) from the portion of the hook body 10 immediately adjacent to the first cutout 110 .

A description of the first and second cutout parts 110 and 120 and a drawing of the working state are detailed in Korean Patent Application No. 10-2019-0111254 pending patent application filed on September 9, 2019 according to the present invention. explained.

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

In a state where the upper thread is passed through the hole of the needle reciprocating in the up and down direction, the needle descends to form an upper thread loop (R) opened in a U shape, and one side of the upper thread loop (R) with the needle in between ( The opposite side of the power shear side) is arranged as a supply-side upper thread (Rb), and the other side (power transmission side) of the loop of the upper thread is arranged as a stitch-side upper thread (Ra) of a sewn product (not shown).

In this state, when the hook body 40 is rotated at a certain angle, the hook 41 hooks the upper thread loop R.

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

In this state, the stitch-side upper thread Ra comes into contact with the outer circumferential portion 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, Of the both wall portions of the first cutout 110 in the rotational direction of the hook body 40, it comes into point contact with the downstream sidewall 111 disposed on the downstream side in the rotational direction of the hook body 40, making it more remarkably than before Since the amount of contact between the outer circumferential portion of the hook body 40 adjacent to the base end of the hook 41 and the stitch-side upper thread Ra is reduced, even if the hook body rotates at high speed, the stitch-side upper thread remains in the first cutout portion 110 ), since the upper thread loop (R) skips rope in a state of minimal contact with the portion of the hook body adjacent to the base end of the hook 41, the upper thread loop (R) retrieved by the thread take-up implemented after the rope skipping movement The total amount of the upper thread amount and the amount of upper thread involved in the stitch and the thread amount of the upper thread loop provided by the take-up machine before the rope skipping motion are almost identical to each other, so that the stitches implemented in the sewing material are made uniform in a tense state.

In addition, when the stitch-side upper thread Ra has a minimal contact surface with the outer circumferential surface of the hook body 40 adjacent to the proximal end of the hook 41, it surely goes over to the side of the bobbin case base facing the power transmission side , It is prevented from being caught between the housing and the bobbin case base 1, and the conventional single thread or touch needle of the upper thread that has occurred is solved.

Then, when the hook body 40 is further rotated at a certain angle around the axis of rotation of the power transmission part, the hook 41 extends the supply-side upper thread Rb supplied by the thread take-up downward while lowering the upper thread loop R is further expanded from the axis of rotation of the power transmission unit so that the upper thread (Ra) on the stitch side is in more contact with the outer circumferential portion of the hook body 40 immediately adjacent to the proximal end of the hook 41, The first cutout 110 at the contact portion or Since the second cutout 120 is formed, the hook body 40 is disposed on the downstream side in the rotational direction of the hook body 40 among both wall portions of the first cutout 110 in the rotational direction of the hook body 40. Point contact with the side wall 111 and the downstream side wall 121 disposed on the downstream side in the rotational direction of the hook body 40 among both wall portions of the second cutout 120 in the rotational direction of the hook body 40 Since the amount of contact between the outer circumferential portion of the hook body 40 adjacent to the base end of the hook 41 and the stitch side upper thread Ra is significantly reduced than before, even if the hook body rotates at high speed, the stitch side upper thread Since the upper thread loop (R) jumps rope in a state of minimal contact with the portion of the hook body adjacent to the proximal end of the hook 41 by the first and second cutouts 110 and 120, it is implemented after the jump rope exercise The total amount of the thread amount of the upper thread loop (R) collected by the thread take-up machine and the amount of upper thread involved in the stitch and the thread amount of the upper thread loop provided by the thread take-up machine before the rope skipping movement become more and more almost the same, so that the stitch implemented in the sewn material is made uniformly in a tense state.

In addition, when the stitch side upper thread Ra has a more minimal contact surface with the outer circumferential surface of the hook body 40 adjacent to the proximal side of the hook 41, the side of the bobbin case base facing the power transmission side is more reliable In addition, it is further prevented from being caught between the housing and the bobbin case base 1, and the conventional single thread or touch needle of the upper thread is further solved.

In the description of the above embodiment, a vertical drum drum in which the tip of the hook that walks the loop of the upper thread is described as an example, but the present invention is not limited thereto, and the tip of the hook that walks the loop of the upper thread rotates in a vertical relationship with the needle. Since the tip of the hook can be applied in a horizontal rotation drum or a vertical rotation drum for zigzag sewing in which the tip of the hook rotates in a horizontal relationship with the needle, the rotation drum of this embodiment includes a vertical rotation drum, a horizontal rotation drum, and a vertical rotation drum for zigzag sewing. should be regarded as

In addition, in the description of the above embodiment, the first case in which a lock stitch and a hitch stitch are formed as the revolving drum barrel moves forward and backward, the second case in which the hitch stitch and the hitch stitch are formed, the third case in which only the lock stitch is formed, The inventors have found that the fourth cases in which only hitch stitches are formed can be implemented.

The revolving drum cylinder 100 for lockstitch of this embodiment can be applied to the third case, for example.

In the third case, the revolving drum cylinder 100 for lockstitch of this embodiment is, as shown in FIGS. 6, 10 and 11, and Korean Patent Registration No. 1955451, which has been applied for and registered by the present inventor. As disclosed in the above, in a state where the upper thread (Ra) on the stitch side of the loop (R) of the upper thread (needle thread) is disposed on one side and the upper thread (Rb) on the supply side is disposed on the other side, the loop (R) of the upper thread is placed on the bobbin. A portion of the rim of the hook body 40 contacts the power transmission projection of the output shaft so that a jump rope movement can be performed with respect to the bobbin case base 1 across both sides of the case base 1. The hook 41 of the hook body 40 has a structure in which the loop R is rotated while walking in the direction of advancing the fabric in the front direction of the sewing worker.

In addition, in the revolving drum cylinder 100 for lock stitching of this embodiment, as shown in FIG. 10 and FIG. 11, the upper thread loop R is disposed first in the direction of advancing the fabric in the front direction of the sewing worker. has been

In addition, in the revolving drum cylinder 100 for lock stitch, the outlet 1a of the lower thread (B; bobbin thread) formed in the bobbin case base 1 or the bobbin case advances the fabric in the front direction of the sewing worker. Behind the loop (R), closer to the power transmission side (one side) than the loop (R) in the rotation axis direction of the hook body (40) and radially outer side of the hook body (40) than the hook body (40) is placed on

In addition, in the revolving drum cylinder 100 for lock stitch, the upper thread Rb on the supply side of the loop R crosses the other side surface of the bobbin case base 1 (the side facing the power transmission side) and the The upper thread Ra of the stitch side of the loop R crosses one side surface of the bobbin case base 1 (the surface facing the power transmission side) so that the loop R jumps rope with respect to the bobbin case base 1 To move, the hook 41 of the hook body 40 and the bobbin case base 1 are shaped to realize a lock stitch (perfect stitch).

That is, when viewed from above, in the bobbin case base 1, in the direction of advancing the fabric in the front direction of the sewing worker, the width of the front part and the rear part disposed with the central part in between is outside the radial direction of the hook body 40 As it goes toward, the hook 41 of the hook body 40 gradually narrows inward in the direction of the rotational axis, and the hook 41 has an oblique side facing one side and a vertical side facing the fabric in the front direction of the sewing worker. In the state of having a triangular shape extending parallel to the direction of advancing, one end of the oblique side 41a meeting the vertical side stitches of the loop R in the direction of the rotational axis of the hook 41 of the hook body 40 It is closer to the needle N than the side upper thread Ra, and the other end of the oblique side 41a extends to reach one side of the bobbin case base 1.

With this configuration, when the lock stitch is implemented when the fabric is advanced in the front direction of the sewing worker, a detailed description will be made with reference to FIGS. 10 and 11 above.

As shown in a of FIG. 10, when the needle N descends in the 12 o'clock direction to make the upper thread loop R in the 12 o'clock direction and rises, the hook 41 rotates counterclockwise to (R), and at this time, as shown in a of FIG. 11, the upper thread (Ra) on the stitch side of the loop (R) is located behind the bobbin thread (B) and crosses the bobbin thread (B). do.

Then, when the hook 41 rotates further counterclockwise, as shown in b of FIG. 10, the loop R of the upper thread is walked and the loop R of the upper thread is located in the 10 direction , At this time, as shown in b of FIG. 11, the gi stitch (P) already implemented on the fabric becomes a support point, and the stitch-side upper thread (Ra) of the loop (R) is located in front of the bobbin thread (B) As the posture is changed to be crossed, the supply side upper thread Rb is disposed behind the hook 41 and the stitch side upper 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 further rotated counterclockwise, as shown in FIGS. 10C and 11C, the supply-side upper thread Rb of the upper thread loop R is moved by the hook 41. As it passes to the other side of the bobbin case base 1, the upper thread loop R is located in the 7 o'clock direction.

Then, as the hook 41 rotates more counterclockwise, the upper thread Rb on the supply side of the upper thread loop R is pulled up by the thread take-up, as shown in d and e in FIG. 10 and d and e in FIG. As described above, while the loop R of the upper thread skips 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 revolving drum cylinder 100 for lock stitching of this embodiment, when the fabric is reversed to the right, as shown below in FIG. 10 and below in FIG. lower thread; B) is disposed, an upper thread loop (R) is disposed behind it, an upper thread (Ra) on the stitch side of the upper thread loop (R) is disposed on one side (back in FIG. 10), and an upper thread (Rb) on the supply side is disposed on the other side In a state where the bobbin thread B is disposed on one side (behind in Fig. 10) of the stitch side upper thread Ra, and the hook 41 is rotated counterclockwise, the supply side upper thread (Rb) moves across the other side of the bobbin case base 1 and moves 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. 10 as follows.

As shown in A of FIG. 10, when the needle N descends in the 12 o'clock direction to make the upper thread loop R at the 12 o'clock direction and rises, the hook 41 rotates counterclockwise to (R), and at this time, as shown in A of FIG. 11, the upper thread (Ra) on the stitch side of the loop (R) is located behind the bobbin thread (B) and intersects the bobbin thread (B). do.

Then, when the hook 41 rotates further counterclockwise, as shown in B of FIG. 10, the upper thread loop R is walked and the upper thread loop R is located at the 10 o'clock direction, At this time, as shown in B of FIG. 11, the gi stitch (P) already implemented on the fabric becomes a support point, and the stitch side upper thread (Ra) of the loop (R) is located in front of the bobbin thread (B) While the posture is changed to cross, the supply side upper thread Rb is disposed behind the hook 41 and the stitch side upper 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 further rotated counterclockwise, as shown in FIG. 10C and FIG. 11C, the supply side upper thread Rb of the upper thread loop R is moved by the hook 41. As it passes to the other side of the bobbin case base 1, the upper thread loop R is located in the 7 o'clock direction.

Then, when the upper thread (Rb) on the supply side of the upper thread loop (R) is pulled up by the thread take-up as the hook (41) rotates more counterclockwise, it is shown in D and E in FIG. 10 and D and E in FIG. As described above, while the upper thread loop (R) jumps 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.

Therefore, in the revolving drum cylinder 100 for lock stitch of the present embodiment, a lock stitch is implemented even if the fabric moves forward and a lock stitch is implemented even if the fabric moves backward, so that even if the fabric moves forward and backward, the lock stitch is uniformly applied to the fabric. Not only can it be implemented, but even if the upper thread made of left-twisted yarn is used, the upper thread loop (R) is in a U-shaped posture, and the upper thread (Rb) on the supply side of the upper thread loop (R) is moved to the bobbin case base (1) by the hook (41). By going around the lower thread (B) through the other side of the rope and skipping with respect to the bobbin case base (1), the upper thread is not additionally twisted in the direction of the left-twist yarn than in the conventional lock stitch rotation drum, so it is implemented on the fabric with a lock stitch. It is possible to significantly prevent wrinkles from occurring on the fabric due to the stitched lines (seam lines).

In the revolving drum cylinder 100 for lock stitch, the outlet 1a of the lower thread (B; bobbin thread) formed in the bobbin case base 1 or the bobbin case is , Behind the loop (R) in the direction of advancing the fabric in the front direction of the sewing worker, adjacent to the power transmission side (one side) than the loop (R) in the direction of the rotational axis of the hook body (40), and the hook body (40) 10 and 11 of the embodiment as being disposed outside the hook body 40 in the radial direction than ), the present invention is not limited thereto, and the lower thread (B) formed on the bobbin case base 1 The bobbin case base side ( The other side) and even if it is arranged radially outside of the hook body 40 than the hook body 40, the lock stitch can be implemented in the forward and backward direction of the fabric in the same way.

One; bobbin case base, 10; first housing, 20; second housing, 30; power transmission rotation unit, 40; hook body, 50; Gib, 100; revolving drum

Claims (9)

A first housing 10 mounted on the main body of the sewing machine or embroidery machine;
A second housing 20 coupled to the first housing 10 and having a non-rotating bobbin case base 1 built-in,
A power transmission rotation unit 30 coupled to the output shaft and rotatably internally connected to at least one of the first and second housings 10 and 20 about the first axis line X, and
A second axis ( A hook body having a hook 41, a first step 42, and a second step 43 sequentially in the rotational direction about the second axis X' with a phase difference at the center of X') (40),
The power transmission rotation unit 30 contacts and pushes the hook body 40 in the first phase section in the rotational direction of the hook body 40 to the first stepped portion 42 formed on the hook body 40 The first power transmission protrusion and push protrusion 31 that rotates and the second stepped portion 43 formed on the hook body 40 contact and push the hook body in the second phase section in the rotation direction of the hook body A second step that provides a space for the upper thread Ra of the stitch side of the upper thread loop R to escape by widening the space between the first stepped portion 42 and the first power transmission projection and push projection 31 of the upper thread loop R. It includes a power transmission projection and a push projection 32,
When the first power transmission protrusion and push protrusion 31 transmits power to the hook body 40 in the first phase period, the first power transmission protrusion and push protrusion 31 Rotation characterized by providing a space in which the upper thread (Ra) on the stitch side of the upper thread loop (R) can enter by widening the gap between the second step portion (43) and the second power transmission projection and push projection (32) north tube. According to claim 1,
The hook body 40 is disposed between the first stepped 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 A revolving drum barrel comprising a detent 44 extending to. According to claim 2,
The second power transmission protrusion and push protrusion 32 is not in contact with the second stepped portion 43 of the hook body 40 in the first phase period and does not transmit power to the hook body 40 , the stitch-side upper thread Ra of the upper thread loop R, which jumps rope with respect to the bobbin case base 1, is connected to the first stepped portion 42 of the hook body 40 and the power transmission rotation portion ( 30) in the second phase section in the rotational direction of the hook body 40 when passing between the first power transmission and push protrusions 31, the second step portion 43 of the hook body 40 ) and is pushed in the rotational direction of the hook body 40 to transmit power to the hook body 40, and the first stepped portion 42 of the hook body 40 and the first power transmission rotating portion 30 The second stepped portion 43 of the hook body 40 is spaced apart from each other by the power transmission and push protrusions 31, and the upper thread loop R is released from the detent 44 before and after. ) and is positioned at a position where power is not transmitted to the hook body 40 by being non-contacted again, and
The first power transmission protrusion and push protrusion 31 is non-contact with the first stepped portion 42 of the hook body 40 in the second phase period and does not transmit power to the hook body 40 After being in the state, the upper thread loop (R) newly entered made by the upper thread given by the thread take-up is the second step portion 43 of the hook body 40 and the second power transmission projection of the power transmission rotating portion 30 In the first phase section in the rotational direction of the hook body 40, which is when entering between the push protrusions 32, the hook body 40 is in contact with the first step portion 42 of the hook body 40 Power is transmitted to the hook body 40 by pushing in the rotational direction of the second step portion 43 of the hook body 40 and the second power transmission projection and push projection 32 of the power transmission rotation portion 30 are spaced apart from each other, and in the course of the upper thread loop (R) skipping rope, it is non-contacted with the first stepped portion 42 of the hook body 40 again and does not transmit power to the hook body 40 Rotating drum barrel, characterized in that positioned in the position to do. According to claim 1,
The first power transmission protrusion and push protrusion 31 and the second power transmission protrusion and push protrusion 32 are the other side of the flange 33 formed to protrude radially outward from the other end side of the power transmission rotation part 30. It is formed on the side, but the first power transmission protrusion and push protrusion 31 has a base end integrally coupled to the outer portion in the radial direction of the other side surface of the flange 33 and the front end is parallel to the first axis line (X). direction to the other side, and the first power transmission projection and push projection 32 has a phase difference with respect to the first power transmission projection and push projection 31 at the center of the first axis line X and the flange The rotating drum drum, characterized in that the base end is integrally coupled to the radially outer portion of the other side surface of (33) and the tip extends to the other side in a direction parallel to the first axis line (X). According to claim 4,
In a state in which the flange 33 is disposed on the other side of the first housing 10 and the power transmission rotating part 30 is rotatably internally connected to the through hole 11 formed in the first housing 10, the To prevent the power transmission rotation 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 circumferential surface of the power transmission rotation unit 30 disposed on one side of the first housing 10, and has a larger outer diameter than the through hole 11, and the first housing 10 The snap ring 12 disposed on one side of the ) is circumscribed and inserted into the annular groove 34,
In a state in which the hook body 40 rotatably surrounds one side of the bobbin case base 1 and is rotatably embedded 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 having a reduced radius is formed on the inner circumferential surface of the through hole 22 or a second guide rail L2 is formed stepwise on the inner circumferential surface of the first housing 10, and the reduced diameter portion ( 23) Alternatively, the hook body 40 is disposed on one side with the second guide rail (L2) interposed therebetween, and the gib 50 circumscribed to one side of the bobbin case base 1 is disposed on the other side, so that the hook body (40) and the gib (50) are rotatably internally connected to the through hole (22) in a state in which they are detachably coupled to each other by a fastening means. According to claim 1,
An opening 24 is formed at the upper end of the second housing 20 for the needle and upper thread loop R to enter and exit, and the portion of the opening 24 facing in the rotational direction of the hook 41 In this case, when the upper thread loop R hooked on the hook 41 jumps rope with respect to the bobbin case base 1, it enters between the upper thread loops R and the upper thread on the stitch side of the upper thread loop R ( In order to prevent Ra) and the supply-side upper thread (Rb) from being moved to one side or the other side together, a divider 25 protruding in the opposite direction of rotation of the hook 41 is formed. According to claim 1,
In order to guide the upper thread loop (R) when the upper thread loop (R) skips rope with respect to the bobbin case base (1), the hook body ( 10) including a friction reducing portion formed at the site,
The friction reducing part enters the other side from the part of the hook body 40 immediately adjacent to the proximal end of the hook 41 and in cooperation Characterized in that it comprises a U-shaped first cutout 110 formed revolving drumstick. According to claim 1,
The hook body 40 is located on the opposite side of the rotation of the hook body 40, and the portion of the hook body 40 facing the first stepped portion 42, of the power transmission rotating portion 30 It has a stopper 45 that comes into contact with the first power transmission projection and push projection 31 when stopped,
The distance between the first stepped portion 42 and the stopper 45 is determined by the first power transmission protrusion and push protrusion 31 being interposed between the first stepped portion 42 and the stopper 45. Create a gap through which the upper thread (Ra) on the stitch side of the upper thread loop (R) can pass. A revolving drum barrel characterized in that it has a length that can be provided. According to claim 1,
The upper thread loop (R) is placed at the front in the direction of advancing the fabric in the front direction of the sewing worker,
The outlet (1a) of the lower thread (B) is behind the loop (R) in the direction of advancing the fabric in the front direction of the sewing worker, and is disposed outside the hook body (40) in the radial direction than the hook body (40) in one state,
The supply side thread (Rb) of the loop (R) crosses the other side of the bobbin case base (1) and the stitch side upper thread (Ra) of the loop (R) crosses one side of the bobbin case base (1). The revolving drum barrel, characterized in that the loop (R) jumps rope with respect to the bobbin case base (1) across.

Images