KR20190103866A - rotating shuttle for hitch stitch that is provided with thread breakage preventing means - Google Patents

Abstract

The present invention relates to a rotary shuttle for hitch stitches, having, added thereto, a thread breakage prevention means which creates a space for entry or escape of a loop of the top thread by causing the part of a hook body that comes into contact with a power transmission protrusion to move temporarily with respect to the power transmission protrusion towards the direction in which the power transmission protrusion rotates, when the loop of the top thread squeezes in between the part of the hook body that comes into contact with the power transmission protrusion from the circumferential direction of the hook body, and the power transmission protrusion. Accordingly, the present invention is capable of forming forward hitch stitches while rotating the hook body at a high speed without breaking the loops of the top thread, thereby being able to significantly increase the efficiency of sewing work that is based on hitch stitches.

Description

Rotating shuttle for hitch stitch that is provided with thread breakage preventing means}

The present invention relates to a rotary drum for hitch stitch, and more particularly, to a single yarn prevention means provided in the rotary drum for hitch stitch.

)와 히치 스티치(

) 가 있다.The stitch implemented using the rotary drum provided in the sewing machine has a perfect switch, a lock stitch (

) And hitch stitch (

)

Rotary drums that implement lock stitch have been applied to sewing machines from the past until now, and the type is a type in which the drive shaft is fixedly circumscribed to a rotary hook body, for example, in Japanese Patent Laid-Open No. 9-122369. Is disclosed.

In the lock stitch, the needle goes down and then goes up to make the upper thread into a U-shaped loop, and then the hook of the hook body hooks the “U” -shaped loop in the same direction as the sewing material is transported (forward of the operator). The upper thread of the upper side of the loop of the upper thread is moved to the power transmission side, and the upper thread of the stitch side moves from the power shear side to the bobbin case side in front of the upper side of the supply side so that the upper part of the loop crosses the upper side of the stitch side and the upper side of the supply side. When the upper thread and the upper thread on the bobbin case base are twisted while sewing the upper thread and the upper thread on the stitch side as the first letter, while the upper thread is twisted while the lower thread is hooked on the lower thread (hereinafter referred to as 'net sewing'), the upper thread on the stitch side As the worker moves forward, the upper thread loop becomes an open loop, and the thread is pulled in one direction with respect to the lower thread. Since it is continuously implemented in a spiral winding method, the upper thread and the lower thread are severely twisted, and a lot of wrinkles occur in the sewing portion, so that the quality of the sewing product is degraded, and when any one of the upper thread and the lower thread becomes single yarn, The problem arises that the stitch is released.

A stitch to overcome this problem is a hitch stitch. To date, the hitch stitch has a hook in a rotary drum for lock stitch, as disclosed in Japanese Patent Laid-Open No. 9-122369, Japanese Patent No. 2008-23261, and JP2009-50638, and as shown in FIG. It is known that a hitch stitch is realized when sewing (hereinafter referred to as 'reverse sewing') while moving the sewing material in a direction opposite to the looping direction of the upper thread (hereinafter referred to as 'reverse sewing').

The hitch stitch implemented by reverse sewing using the rotary drum for lock stitch, like the lock stitch, the needle goes down and then goes up to make a loop of the upper thread, and then the upper thread of the stitch side of the loop part of the upper thread is the power cutting side. Move the bobbin side in front of the supply side upper thread so that the upper part of the loop crosses the upper side of the stitch side and the upper side of the supply side, and then the hook of the hook body hangs the crossed loop in the net sewing direction (the front direction of the operator), Unlike the rope stitch, when the rope is skipped to the base, the upper thread of the stitch side is retracted in the rearward direction of the operator so that the loop of the upper thread becomes a closed loop, which is realized in a manner of being securely wound about the lower thread by the take-up thread. The stitch will not be released even if any one of the sewn upper and the lower thread becomes single yarn. Has the advantage.

However, conventional hitch stitches implemented by reverse stitching using a rotary drum for lock stitch, like the lockstitch, the upper thread loop first turns from the “U” loop to the “X” loop and then skips the bobbin thread. When you jump rope against the bobbin case again with a “U”, the upper thread's stitch side moves to the bobbin case base side, and the supply side upper thread moves to one side of the bobbin case base with its back on the power cutting side. Therefore, as the lower thread and the upper thread are severely twisted like the lock stitch, there is still a problem that wrinkles occur in the sewing portion. Until now, the lock stitch is mainly used in the forward sewing, and in the reverse direction, the stitch is sewn about 3 stitches during the forward direction. It is common for sewing to prevent loose stitches from being stitched. If the fabric to be sewn according to the rotational speed of the hook does not move in the forward direction of the worker and becomes a reverse stitch and a hitch stitch is formed, the alignment of the bar is skewed, and the tension of the upper thread is changed. In the meantime, the existing published patents all relate to techniques for preventing hitch stitches.

Problems of conventional hitch stitches implemented by reverse stitching using a lock stitch or a drum drum for a lock stitch, which are implemented using the drum drum for a lock stitch, are filed and registered by the present inventors. It can only be overcome by the rotary drum for the hitch stitch disclosed in.

The reason for this is as follows.

The rotating drum barrel disclosed in the patent registration publication by the present inventors, as shown in Fig. 8, in contrast to the manner implemented by the rotating drum drum for the lock stitch, is opposite to the direction in which the hook hangs the loop of the upper thread (the rear of the worker). When sewing (reverse sewing) while moving the sewing material in the direction, the lock stitch is realized, and sewing (pure sewing) while moving the sewing material in the same direction (operator's front direction) in the direction in which the hook hangs the loop of the upper thread. Hitch stitch is implemented.

However, in the hitch stitch rotary drum disclosed by the present invention, unlike the conventional lock stitch rotary drum configuration, a power transmission protrusion external to the drive shaft contacts the portion of the hook body of the rotary drum to rotate the hook body. Of the U-shaped loop part of the upper thread when the needle body descends and then rises up to form the U-shaped upper thread loop, and the hook of the hook body walks the upper thread in the direction of the net sewing in the direction of the net sewing. The upper thread of the supply side is pulled to the bobbin case base side by the hook, the upper thread of the stitch side is dragged to the power transmission side, the upper part of the loop intersects the stitch side upper thread and the supply side upper thread, and the stitch side upper thread moves forward in the operator's front direction. As the upper thread loop becomes a closed loop, it is continuously wound in a manner that the upper thread is securely wound about the lower thread by the take-up thread. In particular, the loop of the upper thread jumps about the bobbin case base, and the space between the hook body and the power transmission protrusion contacting the power transmission protrusion in the circumferential direction of the hook body opens and escapes. By making it exit through it, you can implement a forward hitch stitch.

That is, the hitch stitch rotary drum is disclosed by the present inventors, because the upper thread loop is a simple U-shaped rope skipping movement using both sides of the bobbin case base in the rotation axis direction, so that the lower thread and the upper thread are rubbed with each other. Less twisting of the lower thread and upper thread reduces the distortion of the lower thread and the upper thread, and wrinkles can be significantly reduced in the sewing part.However, in the conventional rock stitch rotary drum, the hook body of the rotary drum is fixedly circumscribed on the power transmission shaft. The body is rotated so that the upper thread of the upper thread loop is moved to the surface of the bobbin case base adjacent to the power transmission side, and the upper thread of the loop is shifted to the bobbin case base side so that the loop of the upper thread is connected to the bobbin case base. The X-shaped rope skipping movement makes it possible to implement lock stitch.

However, in the rotary drum for hitch stitch disclosed in Patent No. 10-1657607, filed by the present inventor, the stitch of a loop is connected between the portion of the hook body and the power transmission protrusion in contact with the power transmission protrusion in the circumferential direction of the hook body. When the hook body rotates at a high speed, the upper thread loops into the open space and creates an escape space. When the hook body rotates at high speed, the loop of the upper thread receives a large load on the power transmission protrusion rotating at high speed. The problem is that the loop becomes single yarn and the hitch stitch cannot be continuously implemented.

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

The present invention relates to a loop structure between a portion of a hook body and a power transmission protrusion contacting the power transmission protrusion in the circumferential direction of the hook body in the basic structure of the rotary drum disclosed in Korean Patent No. 10-1657607 filed by the inventor. Single thread that makes part of the hook body contacting the power transmission protrusion temporarily move relative to the power transmission protrusion in the direction of rotation of the power transmission projection when the upper thread of the stitch side is twisted in, thereby creating an escape space of the upper thread of the stitch side of the loop. The problem can be solved by adding the prevention means.

According to the present invention, it is possible to implement a hitch stitch in the forward direction without rotating the hook body at a high speed without single cutting the loop of the upper thread by the above-described problem solving means. The efficiency can be increased significantly.

1 is an exploded perspective view illustrating a bobbin case base, a bracket, and a single yarn preventing means in a housing of a rotary drum according to an embodiment of the present invention;
Figure 2 is a perspective view of the rotary drum of Figure 1 from the opposite side,
3 is an exploded perspective view illustrating the single yarn preventing means of FIG. 1;
Figure 4 is a perspective view of the anti-tilt means of Figure 3 from the opposite side,
5 is a perspective view from below of the rotary drum in FIG.
6 is a conceptual diagram illustrating positions of the power transmission protrusion, the stepped portion and the second stepped portion of the hook body, and the pushed protrusion of the opening portion when the output shaft is rotated in the rotating drum of FIG.
7 is a view showing the shape of the stitch implemented in the forward and reverse directions by the conventional drum drum for lock stitch, and
Figure 8 is a view showing the form of the stitch implemented in the forward and reverse directions by the rotary drum for the hitch stitch invented by the present invention.

Hereinafter, the rotary drum for the hitch stitch of the embodiment according to the present invention will be described in detail with reference to FIGS.

1 to 5, the rotary drum for the hitch stitch of this embodiment is indicated by the reference numeral 100.

In the following description of the hitch stitch rotary drum, one side means the power transmission side, and the other side means the bobbin case base side.

Rotating drum barrel for the hitch stitch 100, the bracket 10 is mounted on the main body of the sewing machine (not shown), detachably mounted on the bracket 10 is built so as not to rotate the bobbin case base (1) as conventional The housing 20, the power transmission rotating part 30 which is fixedly circumscribed to the output shaft (not shown), and the hook 41 and the stepped part 42 are rotatably internally rotatably connected to the housing 20 and a part of the circumference. The provided hook body 40 is included as usual.

The rotary drum drum for hitch stitch 100, unlike the prior art, further comprises a single yarn prevention means (A).

As shown in FIGS. 1 to 6, the single yarn preventing means A is detachably coupled to one side of the housing 20, and the output shaft is connected to the bracket 10 in a state where the output shaft is non-contacted and penetrated. A guide having an annular guide rail 61 having a center of rotation (X ') eccentric to the center of rotation (X) of the power transmission rotating unit 30 is coupled to be selectively movable in the longitudinal direction of the other side. Part 60; And mounted to the guide part 60 in a state in which the output shaft is in contact with the guide rail 61 so as to be rotatable along the guide rail 61, and coupled to the power transmission rotating part 30. While rotating, the hook body 40 is coupled to the power transmission rotation unit 30 so as to be eccentric with respect to the rotational center X of the power transmission rotation unit 30 so as to be eccentric with respect to the power transmission rotation unit 30. The opening portion 50 is moved in a rotational direction of the power transmission rotating portion 30 by a predetermined phase angle.

A portion of the edge of the power transmission rotating part 30 facing the hook body 40 extends to the other side and abuts against the step portion 42 of the hook body 40 in the rotational direction of the hook body 40. A power transmission protrusion 31 for rotating the hook body 40 is formed.

In addition, in order to rotate the opening portion 50 with the rotation center X 'eccentric to the rotation center X of the output shaft, at least one protrusion formed on the other side of the opening portion 50 extending to the other side ( 51 is formed, and the power transmission rotation part 30 has the power transmission rotation part 30 rotatable to the rotation center X of the output shaft while the opening center 50 is eccentric rotation center (X '). The cam hole 32 into which the at least one protrusion 51 is inserted is formed to rotate in the

The present invention is not limited thereto, and the cam hole 32 may be formed in the opening portion 50 and the protrusion 51 may be formed in the power transmission rotating portion 30.

The hook which contacts the power transmission protrusion 31 when the stitch side upper thread of the loop enters between the step portion 42 of the hook body 40 and the power transmission protrusion 31 of the power transmission rotation portion 30. The stepped portion 42 of the body 40 is temporarily moved relative to the power transmission protrusion 31 in the direction in which the power transmission protrusion 31 rotates to make an escape space of the loop of the upper thread of the stitch side of the loop. To this end, the second step portion 43 extends toward one side of a portion of the edge of the hook body 40 spaced apart in the rotational direction of the hook body 40 from the step portion 42 of the hook body 40. And the opening portion 50 is in contact with the second step portion 43 during the eccentric rotation of the opening portion 50, the hook body 40 in the rotational movement direction of the hook body 40 Is positioned at a position that can be moved by a predetermined angle to cross the power transmission rotating unit 30 The first has two step portions 43 extending in the direction of rotation rid push projections 52 in the other direction are formed on.

In addition, the push protrusion 52, the stepped portion 42 of the hook body 40 and the power transmission protrusion 31 of the power transmission rotation part 30 is spaced apart from each other in order to escape the stitch-side upper thread of the loop. When the power transmission protrusion 31 does not transmit power to the hook body 40, the power transmission protrusion 31 is fixed to the output shaft by the output shaft, so that the power transmission rotation part 30 is externally fixed. As the step portion 42 of the hook body 40 approaches and contacts again, the step portion 42 and the second step portion 43 of the hook body 40 rotate together to push the protrusions 52. The second step 43 is spaced apart from each other so that the loop of the upper thread can finally escape through this space.

In addition, the single yarn prevention means (A) is fastened and fixed to the power transmission rotating part 30 so that the opening part 50 is reliably rotated along the guide rail 61 of the guide part 60. In the guide portion 60 includes a gap separation prevention portion 80 for sliding along the second guide rail 62 formed on one side surface.

In addition, since the position of the needle that moves up and down for each type of sewing machine or embroidery machine is different in the axial direction of the output shaft, the rotary drum barrel provided with the single thread preventing means (A) further includes a housing position adjusting means (70). It is included.

The housing position adjusting means 70 is exposed in the other direction and extends in the axial direction of the output shaft and is screwed so that the bore 71 formed in the center of the other side of the bracket 10 is inserted into the bore 71 and fastened. The bolt 73, a hole 73 formed in the lower part of the housing 10 so that a part of the head of the bolt 73 is rotatably inserted, and the lower part of the housing 10 move in the rotation axis direction of the output shaft. Guide rails 74 formed on the upper surface of the bracket 10 for guiding, as long as the bracket 10 is formed to mount the housing 10 to the bracket 10 to allow movement in the direction of the rotation axis of the output shaft. A pair of long holes 75 and bolts not shown are fastened to the housing 20 through the long holes 75 to couple the housing 20 and the bracket 10 to each other.

Since the bracket 10 is mounted on the main body of the sewing machine, the bore 71 formed in the bracket 10 is fixed in position, and formed in the housing 20 mounted on the bracket 10. Since the hole 73 is movable along the guide rail 74 of the bracket 10, when the adjusting bolt 73 is rotated in one direction, the housing 20 moves in one direction. When the adjusting bolt 73 is rotated in the other direction, the lower jing 20 moves in the other direction.

In order to allow the guide unit 60 to be detachably attached to the bracket 10 and to selectively allow movement along with the housing 20 in the direction of the rotation axis of the output shaft, a central hole is formed at one center of the bracket 10. 76 is formed, and the bottom surface of the guide portion 60 is formed with a threaded hole 63 which is fastened to a bolt (not shown) that penetrates the long hole 76.

Hitch stitch rotary drum (100) having a single yarn prevention means (A) configured as described above can be operated as follows.

When the output shaft is rotated, the power transmission rotating part 30 fixedly circumscribed to the output shaft is rotated so that the power transmission protrusion 31 of the power transmission rotating part 30 is located at the far left of FIG. 6. The hook body 40 rotates clockwise in contact with the step 42 of the hook body 40. At this time, the hook 41 of the hook body 40 walks through the loop of the upper thread and As shown in the drawing located in the second position from the left side of FIG. 6 with respect to the bobbin case base 1, the loop performs a rope skipping movement, between the step portion 42 of the hook body 40 and the power transmission protrusion 32. At this time, the stitch side gastric thread of the loop is indented, and at this time, as shown in the third position located in the left side of FIG. 6, the opening 50 is in contact with the power transmission rotating unit 30. With the center of rotation (X ') eccentric to the center of rotation (X) of the power transmission rotating unit 30 The push protrusion 52 of the opening portion 50 contacts and pushes the second step portion 43 of the hook body 40 while rotating in the direction, thereby pushing the step portion 42 of the hook body 40 above. Dropping from the power transmission protrusion 31 of the power transmission rotation part 30, the escape space of the stitch-side upper thread of the loop is generated, and the stitch-side upper thread of the loop escapes through the escape space, and then the power transmission protrusion ( As shown in the figure located at the far right side of FIG. 6, the clock protrusion advances again to contact the step portion 42 of the hook body 40 to push the projection 52 of the opening portion 50. ) Is separated from the second step portion 43 of the hook body 40, to provide a space for the loop to escape, so that the loop of the upper thread is formed without a resistance, one hitch stitch is formed, and the output shaft is continuously Rotation, the output shaft rotates continuously and the hitch stitch is opened. It is presented to the implementations.

Accordingly, the hitch stitch rotary drum 100 having the single yarn prevention means A of the present embodiment rotates the hook body 40 at high speed while not cutting the loop of the upper thread without cutting the loop of the upper thread. Since it is possible to implement, the efficiency of the sewing operation based on the hitch stitch is significantly increased.

One; Bobbin case base, 10; Bracket, 20; A housing, 30; Power transmission rotating unit 40; Hook body, 50; Gaps, 60; Guide section, 70; Housing position adjusting means, 80; Gap separation prevention part, 100; Rotary drum, A; Single shot prevention means

Claims (6)

Bracket (10) mounted to the body,
Removably mounted to the bracket 10, the housing 20, which is built to prevent the bobbin case base (1) to rotate,
Hook body (40) rotatably inscribed in the housing (20) and having a hook (41) and a step portion (42) at a portion of the circumference;
A power transmission rotating part 30 having a power cutting protrusion 31 fixedly circumscribed to an output shaft and contacting the step portion 42 in the rotational direction of the hook body 40 to rotate the hook body 40; And
When the upper thread of the loop for skipping movement between the stepped portion 42 of the hook body 40 and the power transfer protrusion 31 enters, the stepped portion 42 rotates the power transfer protrusion 31. Including a single yarn prevention means (A) for temporarily moving relative to the power transmission projection 31 in the direction to create an escape space of the upper thread,
Rotating drum for hitch stitch having a single yarn prevention means, characterized in that to implement the hitch stitch. The method of claim 1,
The single yarn prevention means (A)
A second step portion 43 extending from one step portion to one side of an edge of the hook body 40 spaced from the step portion 42 of the hook body 40 in the rotational direction of the hook body 40; And
During the eccentric rotation, the hook body 40 is brought into contact with the second step 43 to rotate the hook body 40 without interrupting the upper thread of the loop that is skipped by the rope movement. The opening portion having a push protrusion 52 which is positioned at a position capable of moving by a predetermined angle and extends in the other direction to face the second step portion 43 in the rotational direction across the power transmission rotating portion 30. Rotating drum for hitch stitch having a single yarn prevention means, characterized in that it comprises a (50). The method of claim 2,
Removably coupled to one side of the housing 20, the output shaft is coupled to the bracket 10 to be selectively moved in the longitudinal direction of the output shaft in a non-contact and penetrated state of the power transmission rotating part 30 Further comprising a guide portion 60 having an annular guide rail 61 having a center (X ') eccentric to the rotation center (X) on the other side,
The opening portion 50 is internally mounted to the guide rail 61 so as to be rotatable along the guide rail 61 in a state where the output shaft is non-contacted and penetrated therein, and is mounted to the guide portion 60. For the hitch stitch having a single yarn prevention means characterized in that the center of rotation (X) of the rotating part 30 is coupled to the power transmission rotating part 30 so as to be eccentric with respect to the power transmission rotating part 30. Revolving drum. The method of claim 3, wherein
In order to rotate the opening 50 with the rotation center X 'eccentric to the rotation center X of the output shaft,
At least one protrusion 51 extending to the other side is formed on the other side of the opening 50, and the power transmission rotating unit 30 has the center of rotation of the output shaft (X). A cam hole 32 into which the at least one protrusion 51 is inserted such that the opening 50 is rotated to an eccentric rotation center X ′ while being rotatable in
The cam hole 32 is formed in the open portion 50 and the projection 51 is formed in the power transmission rotating portion 30 Rotating drum for hitch stitch having a single yarn prevention means characterized in that. The method of claim 4, wherein
On the one side of the guide portion 60 in a state that the opening portion 50 is fastened and fixed to the power transmission rotation portion 30 so as to reliably rotate along the guide rail 61 of the guide portion 60. Rotating drum barrel for hitch stitch having a single yarn prevention means, characterized in that it further comprises a gap opening prevention portion 80 for sliding along the second guide rail (62) formed. The method according to any one of claims 1 to 5,
A bore 71 which is exposed in the other direction and extends in the axial direction of the output shaft and is threaded to be formed at the center of the other side of the bracket 10;
Adjusting bolt 73 is inserted into the bore 71 and fastened,
A hole 73 formed in the lower portion of the housing 10 such that a portion of the head of the bolt 73 is rotatably inserted;
Guide rails 74 formed on the upper surface of the bracket 10 to guide the lower portion of the housing 10 to move in the direction of the rotation axis of the output shaft,
A pair of long holes 75 formed in the bracket 10 to mount the housing 10 to the bracket 10 to allow movement in the direction of the rotation axis of the output shaft, and
It further comprises a housing position adjusting means 70 is fastened to the housing 20 through the long hole 75 and having a bolt for coupling the housing 20 and the bracket 10 to each other,
A long hole 76 is formed at the center of one side of the bracket 10, and a threaded hole 63 fastened to a bolt penetrating the long hole 76 is formed at the bottom of the guide part 60. Rotating drum for hitch stitch having a single yarn prevention means characterized in that.

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