JPH11244566A - Hook for embroidery sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To embroider thick textured cloth without thread breakage. SOLUTION: A hook 1 for an embroidery sewing machine has a rail 26 circumferentially provided at the outer peripheral wall of a rotating hook bobbin case holder 3, and receives looped needle thread 12 hooked to the tip 16 of a rotating hook 2, by a thread dividing side end face 26a of the rail 26 to divide the needle thread 12 to the front and rear of the rotating hook bobbin case holder 3. In this case, a thread dividing angle formed by the drop position of a needle 5 and the thread dividing side end face 26a is set to 70 deg. or more. The thread dividing side end face 26a is an end wall of the rail 26 on the side facing the anti-rotating direction of the rotating hook 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shuttle of an embroidery sewing machine which can handle a thick work cloth.

[0002]

2. Description of the Related Art As shown in FIGS. 8 to 10, a hook 50 of a conventional embroidery sewing machine is fitted in an outer hook 54 in which a groove 53 is concavely formed in an inner peripheral wall of a cylindrical portion 51 in a circumferential direction, and a groove 53. An inner rail 58 is provided on the outer peripheral wall of the cylindrical portion 56 in a circumferential direction.
3 and is supported to be rotatable relative to the outer shuttle 54. The outer hook 54 has a portion of the cylindrical portion 51 (groove 53) omitted, and the inner hook 58 fitted therein also has a portion near the drop position of the needle 55 of the rail 57 omitted, and the upper thread 4 crosses the portion.
9 can pass through. Tube part 51 of outer pot 54
In the portion where is omitted, a point 52 having a sharp tip is provided in the circumferential direction, and the point 52 is formed so as to increase in width from the tip toward the proximal side. The outer hook 54 is fixed to the lower shaft 59 and is driven to rotate in the direction of the arrow in FIG.
The rotation of the inner hook 58 is stopped by a hook stopper (not shown) fixed to a sewing machine frame (not shown).

[0003] Next, the shuttle 5 for performing embroidery processing on the work cloth W.
To explain the operation of No. 0, the point 52 of the outer hook 54 hooks a loop of the upper thread 49 formed when the reciprocating vertically moving needle 55 slightly rises from the bottom dead center. When the sword 52 moves with the rotation of the outer hook 54, the loop is enlarged, and the distal end 49a of the loop slides toward the base end along the oblique side 52a of the sword 52. When the blade point 52 moves slightly from the position shown in FIG. 8, the thread splitting side end face 5 which is the end wall of the rail 57 on the side opposite to the rotation direction of the outer shuttle 54
At 7a, the upper thread 49 is received and distributed to the front and rear of the inner hook 58. Then, the loop is gradually enlarged with the movement of the sword 52, and the inner hook 58 dives into the loop.

Here, the angle formed by the falling position of the needle 55 and the thread dividing side end face 57a is referred to as a thread dividing angle A. If the thread splitting angle A is set too large, the rail 57 is shortened and the dynamic balance of the shuttle 50, which is an asymmetrical rotating body, is lost, so that the thread splitting angle A is generally set to 50 ° to 60 °.

[0005]

However, when trying to embroider a work cloth W of a thick material (a thick cloth, a hard cloth, a leather, or the like can be exemplified), the needle 5 is used for the thick work cloth W.
When the needle thread 49 passes through the hole 60 through which the needle thread 5 passes, the resistance is large, and even if the tip 52 is moved by hooking the needle thread 49,
The upper thread 49 is not sufficiently supplied, and the upper thread 49 is in a stretched state. For this reason, the tip 49a of the loop of the upper thread 49
Does not slide sufficiently to the base end side of the sword tip 52, and as shown in FIGS. 9 and 10, the tip portion 49a may hit the thread splitting side end surface 57a of the rail 57 in a state where the tip portion 49a just hits the entrance of the groove 53. . As shown in FIG. 9, the thread dividing side end face 57a
Although the upper thread 49 is formed in a direction substantially perpendicular to the oblique side 52a of the sword tip 52 so as to escape to the base end side of the sword tip 52, the upper thread 49 is still inserted into the gap between the groove 53 and the rail 57. It may be bitten and cut.

[0006] In the case of a sewing machine, a needle having a knife-shaped needle tip is used, and the hole 60 is enlarged by making a cut in the work cloth W when the needle penetrates. The resistance when the upper thread 49 passes can also be reduced. However, in the case of an embroidery sewing machine that forms stitches densely on the work cloth W, if such needles are used, the holes 60 communicate with each other, and thus cannot be used.

An object of the present invention is to solve the above-mentioned problems and to provide an embroidery sewing machine hook capable of embroidering a thick work cloth without thread breakage.

[0008]

In order to achieve the above object, a shuttle of the embroidery sewing machine according to the present invention has a loop shape in which a rail is provided on an outer peripheral wall of an inner shuttle in a circumferential direction, and is hooked on a sword point of an outer shuttle. In the shuttle of the embroidery sewing machine which receives the upper thread at the thread dividing side end face of the rail and distributes it to the front and rear of the inner shuttle, the thread dividing angle between the needle drop position and the thread dividing side end face is 70 °.
It is characterized by the above settings.

Here, in the present specification, the end face on the yarn dividing side refers to an end wall of the rail on the side facing the anti-rotation direction of the outer shuttle.

The thread splitting angle is not particularly limited as long as it is 70 ° or more, but is preferably 75 ° or more, and more preferably 80 ° or more, in order to more reliably sort the upper thread. However, in consideration of the dynamic balance of the shuttle, which is an asymmetrical rotating body, it is preferable that the rail be longer.

[0011]

1 to 7 show an embodiment of a shuttle of an embroidery sewing machine embodying the present invention. The shuttle 1 is driven to rotate around a horizontal axis as shown in FIG. Lower shaft 10
An outer hook 2 fixed to the inner hook, an inner hook 3 rotatably supported in the outer hook relative to the outer hook 2, a bobbin case 4 detachably mounted in the inner hook, and a lower thread And a bobbin 30 wound around the bobbin case 4.

The outer pot 2 has a cylindrical portion 15 into which the inner pot 3 is fitted.
And a groove 17 recessed in the circumferential direction on the inner peripheral wall of the cylindrical portion 15.
And a lower shaft connecting portion 19 provided via a support wall 18 provided on one end side of the cylindrical portion 15. In the outer hook 2, a part of the cylindrical portion 15 (groove 17) is omitted, and a sharpened tip 16 is provided in the circumferential direction in this portion. Sword point 16
Are formed such that the width increases as the distance from the distal end to the proximal end side increases. The lower shaft connecting portion 19 is fixed to the lower shaft 10, and the outer hook 2 is driven to rotate by the lower shaft 10 in the direction of the arrow in FIG. 1.

As shown in FIG. 3, the inner pot 3 has a cylindrical portion 25 into which the bobbin case 4 is fitted, a rail 26 provided on the outer peripheral wall of the cylindrical portion 25 in the circumferential direction, and one end of the cylindrical portion 25. A pole 28 erected at the center axis position in the cylindrical portion 25 via the support wall 27 erected and rotatably supports the bobbin 30.
And a flange portion 29 which is provided on the other end side of the tubular portion 25 and extends in the radial direction of the tubular portion 25. The inner shuttle 3 is fitted into the outer shuttle 2 with the rail 26 fitted in the groove 17 of the outer shuttle 2, and is supported so as to be rotatable relative to the outer shuttle 2. The rail 26 corresponds to a portion of the outer hook where the cylindrical portion 15 (groove 17) is omitted, and approximately the same as that of the portion where the needle 5 is dropped is omitted, and crosses these omitted portions. The upper thread 12 can pass through. The bobbin case 4 accommodating the bobbin 30 is detachably fitted in the cylindrical portion 25. The flange portion 29 is provided with a concave portion 29a into which a hook stopper (not shown) fixed to a sewing machine frame (not shown) is fitted. The rotation is stopped.

The rail 26 of the inner hook 3 is used to hold the loop-shaped upper thread 12 hooked on the point 16 of the outer hook 2 as described later.
Thread splitting side end surface 2 which is an end wall facing the anti-rotation direction of outer hook 2
At 6a, it is received and distributed to the front and rear of the inner pot 3. As shown in FIG. 4, the thread dividing side end surface 26 a is formed in a direction substantially orthogonal to the oblique side 16 a of the sword tip 16. In the shuttle 1, the drop position of the needle 5 and the yarn dividing side end surface 26
The thread splitting angle A, which is the angle formed by a, is set to, for example, about 75 °.

Next, the operation of the shuttle 1 when embroidering a thick work cloth W will be described. The needle thread 12 is supplied to the orbit of the blade point 16 of the outer shuttle 2 which is rotated in synchronization with the vertical movement by the needle 5 which moves up and down. The blade point 16 hooks a loop of the upper thread 12 formed when the needle 5 slightly rises from the bottom dead center as shown in FIGS. When the tip 16 is moved with the rotation of the outer hook 2, the tip 16 is moved.
, The loop of the upper thread 12 is enlarged, and the tip 12a of the loop slides toward the base end along the oblique side 16a of the sword tip 16. Since the work cloth W is a thick material, the upper thread 12 is not sufficiently supplied as described in [Problems to be Solved by the Invention], and the outer hook 2 is in the state shown in FIG. The state where the entrance of the groove 53 on the back side of the rail reaches the position of the thread splitting side end face 57a of the rail 57)
In the figure, the tip 12a of the loop is just hanging on the entrance of the groove 17. In the present invention, since the thread splitting angle A is set to about 75 °, when the outer hook 2 is further rotated about 25 ° from here, as shown in FIG. It reaches the position of the yarn dividing side end surface 26a. At this time, since the inclination of the blade tip 16 is steeper than the state shown in FIG. 4, the tip 12a of the loop of the upper thread 12 slides toward the base end side of the blade tip 16 along the oblique side 16a of the blade tip 16, and FIG. As shown in FIG.
6 over the groove 17 on the back side. Then, as shown in FIG. 7, the upper thread 12 is received by the thread dividing side end surface 26 a of the rail 26 at the back side of the sword tip 16, distributed to the front and rear of the inner hook 3, and the loop is enlarged with the movement of the sword tip 16, The inner pot 3 goes down the loop. Then, the loop-shaped upper thread 12 passes through the shuttle 1 from the thread pull-out side end face 26b,
The lower thread 11 is entangled.

According to the hook 1 of the embroidery sewing machine configured as described above, since the thread splitting angle A is set to 70 ° or more, the upper thread 1 is used as in the case of embroidering a thick work cloth W.
Even when the upper thread 12 is not sufficiently supplied and the upper thread 12 is in a stretched state, the tip 12a of the loop of the upper thread 12 is kept at the point of the sword 1
Slide 6 to the proximal end. Therefore, unlike the related art, the upper thread 12 does not get caught in the gap between the groove 17 and the rail 26, so that the thick work cloth W can be embroidered without thread breakage.

It should be noted that the present invention is not limited to the configuration of the above-described embodiment, and can be embodied by appropriately changing the scope of the invention as follows, for example, as follows. (1) Changing the thread splitting angle A. (2) Changing the shape of the end of the rail 26 as appropriate

[0018]

As described above in detail, according to the embroidery sewing machine hook of the present invention, a thick work cloth can be embroidered without thread breakage.

[Brief description of the drawings]

FIG. 1 is a front view showing a shuttle of an embroidery sewing machine according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 is a front view of an inner pot of the same pot.

FIG. 4 is a side view showing the operation of the shuttle.

FIG. 5 is a side view of another state showing the operation of the shuttle.

FIG. 6 is a view taken in the direction of arrow VI in FIG. 5;

FIG. 7 is a side view showing another state.

FIG. 8 is a front view showing a shuttle of a conventional embroidery sewing machine.

FIG. 9 is a side view of the shuttle.

10 is a view as viewed in the direction of the arrow X in FIG. 8;

[Explanation of symbols]

 1 Hook 2 Outer hook 3 Inner hook 5 Needle 12 Needle thread 16 Sword point 26 Rail 26a Thread dividing side end face A Thread dividing angle

Claims (1)

[Claims] 1. A rail is provided on an outer peripheral wall of an inner hook in a circumferential direction, and a loop-shaped upper thread hooked on a sword tip of an outer hook is received by a thread dividing side end face of the rail and distributed to the front and rear of the inner hook. An embroidery sewing machine hook, wherein a thread dividing angle between a needle drop position and said thread dividing side end surface is set to 70 ° or more.