WO2019168326A1

WO2019168326A1 - Rotary shuttle for hitch stitches, provided with thread breakage prevention means

Info

Publication number: WO2019168326A1
Application number: PCT/KR2019/002339
Authority: WO
Inventors: 강소대
Original assignee: 강소대
Priority date: 2018-02-28
Filing date: 2019-02-27
Publication date: 2019-09-06
Also published as: KR20190103866A; KR102018598B1

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 and thus can significantly increase the efficiency of sewing work that is based on hitch stitches.

Description

Rotary drum for hitch stitch with single thread prevention 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.

Stitches implemented using a rotary drum provided in the sewing machine include a perfect switch, a lock stitch and a 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 moves to the power transmission side, and the upper thread of the stitch side moves from the power shear side to the bobbin case base side in front of the upper side of the supply side so that the upper part of the loop intersects the upper side of the stitch side and the upper side of the supply side with X letter. Then, when the rope on the bobbin case base and the supply side upper thread and the stitch side upper thread become U-shaped as the first time, when the stitch side upper thread is twisted while sewing the lower thread (hereinafter referred to as 'net sewing'), the stitch side The upper thread is advanced in the forward direction of the worker so that the loop of the upper thread becomes an open loop. Since it is continuously implemented in a spiral wound incense, the twisting of the upper thread and the lower thread is severe, causing a lot of wrinkles in the sewing area, and the quality of the sewing product is degraded, and one of the sewn upper thread and the lower thread is The problem arises that the stitch is released.

A stitch to overcome this problem is a hitch stitch. To date, the hitch stitch is hooked in a rotary drum for forward 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 reverse 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 reverse hitch stitch implemented by reverse sewing using the rotary drum for the forward lock stitch, like the lock stitch, the needle goes down and 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 From the transmission side to the bobbin case base side in front of the supply side upper thread, the upper part of the loop crosses the stitch side upper thread and the supply side upper thread, and then the hook of the hook body hooks the crossed loop in the net sewing direction (operator's front direction). When skipping the bobbin case base, unlike the forward lock stitch, 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 securely wound about the lower thread by the take-up thread. In a continuous manner, one of the sewn upper and lower threads Even has the advantage that the stitching does not loosen.

However, conventional reverse hitch stitches implemented by reverse sewing using a rotary drum for forward lock stitches, like the forward lock stitches, the upper thread loop first turns from the "U" loop to the "X" loop and jumps over the rope. Then, when the lower thread is hooked and the rope jumps back to the bobbin case base with the letter “U”, the stitched upper thread of the upper thread moves to the bobbin case base side, and the supply upper thread is to one side of the bobbin case base with its back on the power transmission side. Since the rope jumps, the lower thread and the upper thread are twisted like the lock stitch, and there is still a problem that wrinkles occur in the sewing area. Up to now, the forward lock stitch is mainly used in the forward sewing, and in the reverse direction, 3 Make sure the stitches are stitched so that the stitched seams of the forward locks When sewing is common, sometimes the fabric to be sewn in accordance with the rotational speed of the hook during the implementation of the forward lock stitch can not move in all directions of the worker is reverse sewing to form a reverse hitch stitch, the alignment of the sewing is crooked This results in a change in the tension of the upper thread resulting in single yarns, so that all existing published patents relate to techniques for preventing reverse hitch stitches.

Problems of the conventional reverse hitch stitch implemented by reverse stitching using a lock stitch implemented using a rotary drum for a forward lock stitch or a rotary drum for a forward lock stitch are the tenth filed and filed by the present inventors. It can only be overcome by the rotary drum for the forward hitch stitch disclosed in -1657607.

The reason for this is as follows.

The rotating drum barrel disclosed by the present inventors in the patent registration publication, as shown in FIG. 8, is opposite to the direction in which the hook hangs the loop of the upper thread, as opposed to the manner implemented by the rotating drum drum for the forward lock stitch (the operator's When sewing (reverse sewing) while moving the sewing material in the reverse direction, the reverse lock stitch is implemented, and 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. Forward sewing), a forward hitch stitch is implemented.

However, in the rotary drum for the forward hitch stitch disclosed by the present inventors, unlike the conventional structure of the rotary drum for the forward lock stitch, the power transmission protrusion circumscribed to the drive shaft contacts a part of the edge of the hook body of the rotary drum so that the hook body is closed. It is designed to rotate so that the needle goes down and then goes up to make a loop of U-shaped upper thread, and then when the hook of the hook body walks the upper thread in the direction of pure sewing, the U-shaped loop of the upper thread 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, and the upper side of the loop intersects the upper thread of the stitch side and the supply side upper thread, As the loop of the upper thread becomes a closed loop, it is wound securely about the lower thread by the take-up. In particular, the loop of the upper thread jumps about the bobbin case base and enters with the gap between the hook body and the power transmission protrusion touching the power transmission protrusion in the circumferential direction of the hook body. Alternatively, the escape space can be made to exit through the hitch stitch in the forward direction.

That is, in the rotary drum for the forward hitch stitch disclosed by the present inventors, since the loop of the upper thread is a simple U-shaped rope skipping movement using both sides of the bobbin case base in the rotational axis direction, it is the forward lock stitch that the lower thread and the upper thread rub together. It is less than the main rotary drum, so the torsion of the lower thread and the upper thread can be significantly reduced, and wrinkles can be significantly reduced in the sewing area. However, in the conventional forward lock stitch rotary drum, the hook body of the rotary drum is fixed to the power transmission shaft. The outer thread is rotated and the hook body is rotated.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 bobbin case. The X-shaped rope skipping movement with respect to the base makes the forward lock stitch inevitable. .

However, in the rotary drum for the forward hitch stitch disclosed in Korean Patent No. 10-1657607, filed by the present inventor, the loop between the hook body and the power transmission protrusion in contact with the power transmission protrusion in the circumferential direction of the hook body is provided. As the upper thread of the stitch side enters and opens, it creates an entry or exit space and exits through it. When the hook body rotates at high speed, the loop of the upper thread is placed on the power transmission protrusion rotating at high speed. The upper thread loop became single yarn, causing a problem that the forward hitch stitch could not be implemented continuously.

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. When the stitch side upper thread enters or escapes, the part of the hook body which contacts the power transmission protrusion is temporarily moved with respect to the power transmission protrusion toward the direction in which the power transmission protrusion rotates so that the stitch side upper thread of the loop enters or escapes. The problem can be solved by adding an anti-firing means to make a.

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

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 is mounted on the body of the sewing machine (not shown) via a height adjustment bolt (not shown), detachably mounted on the bracket (10) bobbin case as conventional A housing 20 in which the base 1 is not rotated, a power transmission rotating part 30 which is fixedly circumscribed to an output shaft (not shown), and a hook which is rotatably inscribed in the housing 20 and a part of a circumferential part thereof; The hook body 40 provided with the 41 and the step part 42 is included as usual.

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

1 to 6, the single yarn preventing means (A) is detachably or fixedly coupled to one side of the housing 20, the output shaft is in contact with the bracket 10 in a non-contact state ) Is coupled to the output shaft in the longitudinal direction of the output shaft, the annular guide rail 61 having a rotation center (X ') eccentric to the rotation center (X) of the power transmission rotating part 30 to the other side Guide unit 60 provided; 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 step portion 42 of the body 40 is temporarily moved with respect to the power transmission protrusion 31 in the direction in which the power transmission protrusion 31 rotates to enter or exit the space of the loop of the upper thread of the stitch side of the loop. In order to make the second step portion 43 toward one side of the edge portion 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 It is formed to extend, and the opening portion 50 in contact with the second step portion 43 during the eccentric rotation of the opening portion 50 to rotate the hook body 40 of the hook body 40 The power transmission rotating unit 3 is positioned at a position that can be moved by a predetermined angle in the movement direction. A push protrusion 52 extending in the other direction to face the second step portion 43 in the rotational direction across the 0) is formed.

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 rotating portion 30 to enter or escape the stitch-side upper thread of the loop. When the power transmission protrusion 31 does not transmit power to the hook body 40 when it is spaced apart, the power transmission protrusion 31 is output shaft because the power transmission rotation part 30 is externally fixed to the output shaft. By approaching the step portion 42 of the hook body 40 again by contact, the step portion 42 and the second step portion 43 of the hook body 40 is rotated together to the push protrusion ( 52, the second step 43 is spaced apart so that the loop of the upper thread can finally enter or exit through the space.

In addition, the single yarn prevention means (A), in the state in which the opening portion 50 is fastened to the power transmission rotating portion 30 so as to reliably rotate along the guide rail 61 of the guide portion 60. It includes an opening portion departure prevention portion 80 for sliding along the second guide rail 62 formed on one side of the guide portion 60.

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 portion of the housing 20 so that a part of the head of the bolt 73 is rotatably inserted, and the lower portion of the housing 20 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 20 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. It is a time point at which the upper thread of the stitch side of the loop enters or escapes according to the phase. In this case, as shown in the drawing located at the third from the left side of FIG. 6, the opening 50 is the power transmission rotating unit 30. The center of rotation (X ') eccentric to the center of rotation (X) of the power transmission rotating unit 30 in contact with While pushing in the clockwise direction, the push protrusion 52 of the opening portion 50 contacts and pushes the second step portion 43 of the hook body 40, thereby increasing the step portion 42 of the hook body 40. Drop from the power transmission protrusion 31 of the power transmission rotation part 30, the entry or escape space of the stitch-side upper thread of the loop is generated, the stitch-side upper thread of the loop escapes through the entry or escape space Then, the power transmission protrusion 31 is advanced in the clockwise direction, as shown in the figure located on the far right side of Figure 6, contacting the stepped portion 42 of the hook body 40 again the opening portion 50 ) Push projection 52 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 not subjected to resistance and one hitch stitch is formed If the output shaft rotates continuously, the output shaft The enemy rotated in the hitch stitches are to be continuously implemented.

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.

Claims

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;

The hook body 40 is fixed to the output shaft and contacts the step portion 42 in the rotational direction of the hook body 40.

A power transmission rotating unit 30 having a power transmission protrusion 31 for rotating, and

When the upper thread of the loop for skipping movement enters or escapes between the stepped portion 42 of the hook body 40 and the power transfer protrusion 31, the stepped portion 42 is the power transfer protrusion 31. Including the anti-firing means (A) for temporarily moving relative to the power transmission projection 31 toward the direction of rotation to create the entry or 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

Including opening portion 50,

In the opening portion 50, the hook body 40 is contacted with the second step portion 43 at the time of the eccentric rotation of the opening portion 50, and the hook body 40 is predetermined in the rotational movement direction of the hook body 40. Positioned in a position that can be moved by the angle of the single yarn, characterized in that the push projection 52 extending in the other direction facing the rotation step in the second step portion 43 in the direction of rotation across the power transmission rotating unit 30 Rotating drum for hitch stitch provided with prevention means.
The method of claim 2,

Is 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-contacted state and the center of rotation of the power transmission rotating part ( It further comprises a guide portion 60 having an annular guide rail 61 having a center (X ') eccentric to 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,

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

A second portion formed on one side surface of the guide part 60 in a state in which the opening part 50 is engaged with the power transmission rotating part 30 so as to rotate along the guide rail 61 of the guide part 60; Rotating drum case 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 guide rail (62).
The method of claim 1,

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 20 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 20 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 20 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.