JPH09294883A - Needle thread holding device for hand stitch sewing machine - Google Patents

Abstract

(57) [Abstract] [Problem] To reduce the influence of the thread on the "twist" to eliminate sewing defects such as thread breakage, expand the types of needle thread that can be used, and expand the usable range of the hand stitch sewing machine. . Prevents tightening of the seams and creates beautiful seams that are soft and have a texture close to that of hand stitching. A needle thread holding device 1 is not provided with a conventional cloth belt 12. The plate 14 extends from the tip of the collar 13 toward the insertion side of the sword tip 51.
Brushes 15 ... Are planted at a plurality of positions at predetermined intervals on the tip portion 141 of the plate 14. This brush 15 ...
The tip 151 side extends toward the end position on the side edge 111c side of the outer peripheral surface 111. Brush 15 ... is the tip 1
The length of 51 reaches the outer peripheral surface 111, and is formed of horsehair or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle-thread holding device for a hand-stitch sewing machine, which holds a needle thread pulled out from a work by a lower looper with the hand-stitch sewing machine.

[0002]

2. Description of the Related Art Hand stitch sewing machines are disclosed in Japanese Patent Laid-Open No. 4-183494 and Japanese Utility Model Publication No. 7-40374.

As shown in FIGS. 3 and 4, the hand-stitch sewing machine has a needle hole N1 at the center in the lengthwise direction with both ends as sword tips.
The needle N formed with the needles is alternately passed through the needle drop holes 41 formed in the needle plate 4 by the two needle bars 2 and 3 provided on the upper and lower sides of the sewing machine table (not shown), and stitches such as hand stitches are formed. It is a sewing machine that forms (hand stitch).

In order to form a stitch like hand-sewn in this sewing machine, the needle thread I has a predetermined finite length, and the needle I penetrating the workpiece W on the needle plate 4 from above is the needle bar at the bottom of the sewing machine table. 3, the needle thread I on the side where the stitch of the needle N is not formed is scooped by the sword tip 51 of the lower looper 5 and is completely pulled out below the needle plate 4. And this needle thread I
Since it is entangled in the sewing machine if it is left free, the hand stitch sewing machine uses a predetermined thread holding device.

As shown in FIGS. 5 and 6, this conventional needle thread holding device 100 is provided with a drum 11. The outer peripheral surface 111 of the drum 11 is formed into an arcuate curved surface. The outer peripheral surface 111 is wholly covered with a cloth belt 12 which is stretchable in the length direction at its end portion by a predetermined elastic member.

The lower looper 5 rotates clockwise in FIG. 4 with the center position of the arc shape of the drum 11 as the center of rotation. Due to this rotation, the sword tip 51 causes the needle N that penetrates the workpiece W to penetrate.
Of the needle thread I passing through the side of the
1, the outer peripheral surface 111 and the cloth belt 12 from the end 111a side
Slides between the outer peripheral surface 111 and the outer peripheral surface 111 along the outer peripheral surface 111.
Moves toward the one end 111b side. Then, the needle thread I which is freed by the rotational movement is attached to the outer peripheral surface 11
The needle thread I is held in the groove 112 by guiding the needle thread I into the groove 112 formed from one end 111a to the other end 111b. Since the groove 112 is covered with the cloth belt 12, the needle thread I does not come out of the drum 11.

The sword tip 51 is inserted from one side edge 111c on one side of the outer peripheral surface 111. In addition, the outer peripheral surface 111
A flange 13 extending toward the outside of the outer peripheral surface 111 is formed on the side edge 111d on the other side. In addition,
The alternate long and short dash line N2 indicates the needle drop position of the needle N.

[0008]

However, the above-mentioned conventional techniques have the following problems.

That is, since the lower looper 5 is in sliding contact with the cloth belt 12, the drum 11 of the conventional needle thread holding device 100 described above.
However, the needle thread I captured by the lower looper 5 is subject to a large frictional resistance between the lower looper 5 and the cloth belt 12, and there is a problem in that the "twist" of the needle thread I is returned and disengaged. In this case, if the strength of the yarn is weak, it also causes breakage of the yarn. Further, on the contrary, "twisting" is further applied, and the thread becomes a dumpling shape, which is also a cause of defective sewing. For these reasons, the conventional hand-stitch sewing machine has a problem that only limited special threads can be used.

Further, the needle thread I is not introduced into the groove 112,
In some cases, the outer peripheral surface 111 and the cloth belt 12 are clamped. In this case, when the needle thread I held on the drum 11 is pulled out, similarly, due to the frictional resistance from the cloth belt 12, the thread that has already formed the stitches on the workpiece W is excessively pulled and tightened. There was a problem of causing.

Therefore, an object of the present invention is to "twist" a yarn.
This reduces the impact on sewing and eliminates sewing failures such as thread breakage, expands the types of needle threads that can be used, expands the usable range of hand stitch sewing machines, and prevents the occurrence of seam tightening. The seams are soft and have a beautiful finish that is closer to the texture of hand-sewn.

[0012]

Means for solving the above-mentioned problems will be described by adding corresponding members and reference numerals in parentheses in the embodiments of the invention described later.

According to the first aspect of the present invention, the needle thread (I) of the needle (N) that reciprocates between the pair of needle bars (2, 3) arranged with the workpiece (W) interposed therebetween is captured. A lower looper (5) having a sword tip portion (51) and a thread holding portion (drum 11) having an outer peripheral surface (111) provided along the movement path of the lower looper.
And the sword tip has one side edge (11
1c) side is extended toward the other side end edge (111d) side, and the lower looper catches the needle thread and moves along the outer peripheral surface to hold the needle thread on the outer peripheral surface. In a needle thread holding device of a hand stitch sewing machine, a locking means is formed from the other side edge of the outer peripheral surface in the lower looper direction and away from the tip of the sword. The locking means and the one side part A first thread withdrawing preventing means (brush 15 ...) For enabling movement of the sword tip portion is provided between the end edge side, and the locking means, the first thread withdrawing preventing means and the outer peripheral surface are used for the above. A needle thread holding device (1) for a hand stitch sewing machine, characterized in that the sword tips are surrounded by a predetermined distance.

According to the needle thread holding device of the hand-stitch sewing machine according to the first aspect, the sword tips of the lower looper are surrounded by the locking means, the first thread pull-out preventing means and the outer peripheral surface at a predetermined interval. It is possible to prevent the needle thread from coming off the outer peripheral surface. The first yarn withdrawal preventing means is arranged on one side end edge side of the outer peripheral surface which is the base end side of the lower looper.
Since the sword tip can be moved, it does not hinder the movement of the sword tip. On the side edge side opposite to the outer peripheral surface, the locking means prevents the needle thread from coming out. Therefore, it is possible to prevent the needle thread from coming out from both side portions of the outer peripheral surface even if the needle thread is prevented from coming off by pressing the outer peripheral surface as a whole, that is, even if the needle thread dances on the outer peripheral surface. Absent.

Therefore, according to the needle thread holding device of the hand stitch sewing machine of the first aspect, the needle thread can be pulled out from both sides of the thread holding portion without pressing the outer peripheral surface as a whole as in the prior art. Since the frictional resistance applied to the needle thread can be reduced compared to the conventional method, the effect on the thread "twist" is reduced, sewing defects such as thread breakage are eliminated, and the types of needle thread that can be used are expanded. Thus, it is possible to expand the usable range of the hand stitch sewing machine, prevent the occurrence of seam tightening, and create a beautiful finished stitch that is soft and has a texture close to that of hand stitching.

According to a second aspect of the present invention, the locking means is provided with a flange portion (13) extending outside the outer peripheral surface, and the sword tip portion is provided from the flange portion toward the one side. 2. A needle thread holding device for a hand-stitch sewing machine according to claim 1, wherein the needle thread holding device is formed by a second thread slip-out preventing means (plate 14) which is arranged so as to face the outer peripheral surface at a predetermined distance from. Is.

According to another aspect of the present invention, there is provided a needle thread holding device for a hand stitch sewing machine, wherein the second thread pull-out preventing means is arranged so as to face the outer peripheral surface with a predetermined distance therebetween with the sword tip passing position therebetween. Since it prevents it from coming out from the outer peripheral surface,
For example, even when the thread holding portion is formed in a drum shape, the needle thread does not fall out of the outer peripheral surface portion and the needle thread does not hang down from the thread holding portion.

Therefore, according to the needle thread holding device of the hand stitch sewing machine of the second aspect, even if the thread holding portion has a drum shape or the like, the thread holding is performed without pressing the outer peripheral surface as a whole as in the conventional case. To prevent the needle thread from coming out of the
Since the frictional resistance applied to the needle thread can be reduced more than before, the effect on the thread "twist" can be reduced, sewing defects such as thread breakage can be eliminated, and the types of needle thread that can be used can be expanded to make a hand stitch sewing machine. It is possible to expand the usable range of the sewing machine and prevent the occurrence of tightening of the seam so that the seam has a beautiful finish close to the texture of the hand-sewn texture.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the structure will be described.

FIG. 1 is a front view of a yarn holding device 1 according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of the same. In FIGS. 1 and 2, the same reference numerals as those in FIGS. 3 to 5 denote the conventional needle thread holding device 10 described above with reference to the drawings.
It is the same member as 0 and its detailed description is omitted. The following description will focus on the point that the yarn holding device 1 is different in structure from the conventional needle yarn holding device 100.

First, the needle thread holding device 1 is a conventional cloth belt 1
2 is not provided. The drum 11 (thread holding portion) has an outer peripheral surface 1 along the movement path of the lower looper 5.
11 is formed. From one side edge 111d side of the outer peripheral surface 111, in the direction of the lower looper 5 and the sword tip 51
The collar 13 extends away from the. A plate 14 as a second yarn extracting means is provided so as to extend from the tip end of the collar 13 to the other side end edge 111c side of the outer peripheral surface 111.

The plate 14 is arranged facing the outer peripheral surface 111 at a predetermined distance from the blade point 51. Brushes 15 (first yarn extracting means) are planted at a plurality of positions at predetermined intervals on the tip portion 141 of the plate 14, and the tip end 151 side of the brush 15 is a side edge 11 of the outer peripheral surface 111.
It extends toward the end position on the 1c side. Brush 15 ...
Is a length such that the tip 151 reaches the outer peripheral surface 111, and is formed of horsehair or the like, and the collar portion 13 and the side edge 1 of the outer peripheral surface 111 are formed.
The sword tip portion 51 can be moved to and from the 11c side.

Next, the operation will be described.

According to the needle thread holding device 1, the brush 15 as the first thread pull-out preventing means has the outer peripheral surface 111 of the needle thread I.
Prevent you from getting out of. The prevention of this slip-out is made by the end position of the outer peripheral surface 111 on the side end edge 111c side (the sword tip 51).
The position of the end portion on the insertion side). Since the brush 15 made of horsehair or the like is arranged at a plurality of positions at predetermined intervals to prevent the thread I from slipping out, the movement of the sword tip 51 is not hindered. On the side edge 111d side opposite to the outer peripheral surface 111, the collar 13 prevents the needle thread from coming out. Therefore, it is not necessary to prevent the needle thread I from coming off by pressing the outer peripheral surface 111 as a whole as in the conventional case, that is, the needle thread I is not attached to the outer peripheral surface 111.
Even if the dance occurs, the needle thread I does not come out from both sides 111c and 111d of the outer peripheral surface 111.

Further, a plate 14 as a second thread withdrawing preventing means extends from the tip end of the collar 13 toward the insertion side of the sword tip 51, whereby the outer peripheral surface sandwiching the passage position of the sword tip 51. The needle thread I is prevented from slipping out of the outer peripheral surface 111 at a position facing the 111 with a predetermined space.
Therefore, even if the outer peripheral surface 111 is not entirely pressed to prevent the needle thread I from coming out as in the conventional case, the needle thread I is prevented from coming out and hanging down from the drum 11.

Therefore, according to the needle thread holding device 1, it is possible to prevent the needle thread I from coming out of the drum 11 without pressing the outer peripheral surface 111 as a whole as in the prior art, and to reduce the frictional resistance applied to the needle thread I. Since the number of needle threads can be reduced compared to the conventional one, the effect of needle thread on "twist" is reduced, sewing defects such as thread breakage are eliminated, and the types of needle thread that can be used are expanded to expand the usable range of hand stitch sewing machines. In addition, it is possible to prevent the occurrence of tightening of the seam and to obtain a beautifully finished seam that has a soft seam and is closer to the texture of hand stitching.

Needless to say, the above embodiments of the present invention do not limit the present invention. For example, the first
Instead of the brush 15 as the yarn withdrawal preventing means, a shaft-shaped member formed of an elastic material such as rubber may be planted. Alternatively, an air curtain may be formed by a well-known technique from the end position of the outer peripheral surface 111 on the side end edge 111c side (the end position of the blade tip 51 insertion side end) to the plate 14. Further, instead of the plate 14, the collar 13
You may make it form an air curtain from the front-end part to the insertion side of the sword tip 51. In addition, the collar 13 as the locking means of the present invention and the plate 14 may be integrally formed.

[0028]

According to the invention described in claim 1, the needle thread is prevented from coming out from both sides of the thread holding portion without pressing the outer peripheral surface as a whole as in the prior art, and Since this frictional resistance can be reduced compared to the past, the effect on the thread "twist" is reduced, sewing defects such as thread breakage are eliminated, and the types of needle thread that can be used are expanded to enable the use of hand stitch sewing machines. By expanding the range and preventing the occurrence of seam tightening, it is possible to create a beautiful seam with a soft seam and a texture close to that of hand-sewn.

According to the second aspect of the present invention, even if the thread holding portion has a drum shape or the like, the needle thread is prevented from coming out of the thread holding portion without pressing the outer peripheral surface as a whole as in the conventional case. Since the frictional resistance applied to the needle thread can be reduced compared to the conventional method, the effect of the thread on the twist is reduced, sewing defects such as thread breakage are eliminated, and the types of needle thread that can be used are expanded. It is possible to expand the usable range of the hand stitch sewing machine and prevent the occurrence of seam tightening so that the seams are soft and have a beautiful finish close to the texture of hand sewing.

[Brief description of drawings]

FIG. 1 is a front view of a needle thread holding device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of a needle thread holding device according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a conventional hand stitch sewing machine.

FIG. 4 is a view for explaining the operation of a conventional hand stitch sewing machine.

FIG. 5 is a front view of a conventional needle thread holding device.

FIG. 6 is a partially enlarged sectional view of a conventional needle thread holding device.

[Explanation of symbols]

 1 Needle thread holding device 11 Drum 111 Outer peripheral surface 111a Outer peripheral surface front edge 111b Outer peripheral surface rear edge 111c Outer peripheral surface side edge 111d Outer peripheral surface side end edge 13 Tsuba 14 Plate 15 Brush 5 Lower looper 51 Sword tip I Needle thread N Sewing needle W to be sewn

Claims (2)

[Claims] 1. A lower looper having a sword tip portion for capturing a needle thread of a needle that reciprocates between a pair of needle bars arranged with a sewn object in between, and an outer periphery provided along a moving path of the lower looper. A thread holding portion having a surface, the sword tip portion is extended from one side end edge side of the outer peripheral surface toward the other side end edge side, the lower looper captures the needle thread and the outer peripheral surface A needle thread holding device for a hand stitch sewing machine, which holds a needle thread on an outer peripheral surface of the needle stitch by moving along the outer peripheral surface of the outer peripheral surface of the needle thread holding apparatus in the lower looper direction and away from the sword tip. A stop means is formed, and a first thread pull-out preventing means that enables movement of the sword tip portion is provided between the locking means and the one side end edge side, and the locking means, the first The sword tips are separated by a predetermined distance by means of the thread withdrawal preventing means and the outer peripheral surface. Characterized in that it surrounds the needle thread holding device of the hand sewing machine. 2. A brim portion in which the locking means is extended to the outside of the outer peripheral surface, a flange portion provided toward the one side from the brim portion, and a predetermined distance from the sword tip portion on the outer peripheral surface. The needle thread holding device for a hand-stitch sewing machine according to claim 1, wherein the needle thread holding device is formed by a second thread pull-out preventing means that is arranged to face each other.