JP2002306884A - Method for manufacturing hand sewing needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for accurately forming a passing hole by an extra fine steel wire and surely fixing the extra fine steel wire to a needle main body. SOLUTION: The method is composed of the bending process of bending the extra fine steel wire 1 in a chevron shape by clamping a part to be the circular arc part 1a and forming two arm pieces 1b, the proximity process of clamping an inner core tool 2 at the circular arc part 1a, bending both arm pieces further in the direction of approaching each other and bringing the tip parts 1c of both arm pieces close, the clamping process of clamping the tip parts of both arm pieces by a clamping tool 3 comprising an upper member 3a and a lower member 3b, the winding process of turning at least one of the inner core tool 2 and the clamping tool 3 for the required number of times with a virtual axis M-M passing through the middle point of the circular arc part 1a and the middle part of the tip part as a center axis, winding both arm pieces each other and forming the passing hole 1e and a winding part 1d, the cutting process of cutting the winding part 1d of a partially fabricated item for which the winding process is completed into a required length and then the fixing process of fitting the winding part 1d to a fitting hole 4b formed at the head part 4a of a needle main body 4 and fixing it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a hand sewing needle in which a thread through hole is formed of an extremely fine steel wire, the inside diameter of the through hole is increased, and the thread is easily passed.

[0002]

2. Description of the Related Art A through hole for passing a thread is formed in the head of a hand sewing needle. However, the through hole usually has a small inner diameter, and therefore, the through hole is used for an elderly person or a person with weak eyes. The operation of passing the thread through the hole was extremely troublesome.

In recent years, in view of these problems, a hand sewing needle has been invented in which a through hole for a hand sewing needle is formed using a fine wire such as a piano wire to form a large diameter through hole, and the through hole is attached to the head of the needle body. Have been.

[0004] In this hand sewing needle, the through hole is large, so that even the elderly can easily pass the thread. Further, since the ultrafine steel wire forming the through hole is elastically deformed when the hand sewing needle is passed through a cloth or the like, there is no adverse effect after sewing.

[0005] Since this hand sewing needle cannot be used with a finger thimble, it can be used only for hand sewing without using a finger thimble. However, it is extremely advantageous for people with weak eyes.

[0006]

To accurately form a through hole with a fine steel wire and securely fix the fine steel wire to the needle body, it is difficult to handle the needle body and the fine steel wire because they are small. It is very difficult in practice.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a method of accurately forming a through hole with a fine steel wire and securely fixing the fine steel wire to a needle body. .

[0008]

A description will be given with reference to FIGS. 1 to 8. The method for manufacturing a hand sewing needle according to the present invention includes a bending step of bending the ultrafine steel wire 1 into a mountain shape with a portion serving as an arc portion 1a therebetween to form two arm pieces 1b, 1b. 1a, the center arm 2 is interposed therebetween, and the both arms 1b, 1b are further bent in a direction approaching each other, and the distal ends 1 of the both arms 1b, 1b are bent.
c, 1c approaching process, a clamping process of clamping the distal end portions 1c, 1c of both arm pieces 1b, 1b with a clamping device 3 composed of an upper member 3a and a lower member 3b; One of them is rotated a required number of times about a virtual axis MM passing through the middle point of the arc portion 1a and the middle point of the tip portions 1c, 1c as necessary, and the arms 1b, 1b are wound around each other to pass through. A winding step for forming the hole 1e and the winding section 1d, a cutting step for cutting the winding section 1d of the semi-finished product having completed the winding step to a required length, and a winding step for connecting the winding section 1d to the head of the needle body 4. It consists of a fixing step of fitting and fixing in the fitting hole 4b formed in the portion 4a.

In the fixing step, after the winding portion 1d is fitted into a fitting hole 4b formed in the head 4a of the needle body 4,
It is preferable to fix the winding portion 1d by caulking the head 4a.

[0010]

An embodiment of a method for manufacturing a hand sewing needle according to the present invention will be described with reference to FIGS. This manufacturing method includes a bending step, a proximity step, a clamping step, a winding step, a cutting step, and a fixing step.

In the first bending step, the ultrafine steel wire 1 such as a piano wire is cut into a required length, and the steel wire 1 is bent into a mountain-like shape with a substantially central portion, which is to be an arc portion 1a, interposed therebetween. One arm piece 1b, 1b is formed (see FIG. 1). In the next approaching step, both the arm pieces 1b, 1b
Are further bent in the direction in which they approach each other, and the tips 1c, 1c of the both arm pieces 1b, 1b are brought close to each other (FIGS. 2 and 3). This core member 2 determines the final shape of the arc portion 1a.

In the subsequent clamping step, the distal ends 1c, 1c of the both arm pieces 1b, 1b are strongly clamped from above and below so as not to move between the lower member 3b and the upper member 3a of the clamp 3 (FIG. 4). In the next winding step, at least one of the core member 2 and the holding member 3 is rotated a required number of times with the virtual axis MM passing through the middle point of the arc portion 1a and the middle point of the tip portions 1c, 1c as the central axis. To move the both arm pieces 1b, 1b around each other so that the through hole 1e and the winding portion 1
d is formed (FIG. 4). Here, only the core tool 2 or only the holding tool 3 may be rotated, or both of them may be rotated in opposite directions.

Further, in the subsequent cutting step, the semi-finished product having completed the winding step is detached from the core member 2 and then its winding portion 1d
Is cut to the required length (FIG. 6). Then, in the final fixing step, the wound portion 1d cut to the required length is fitted and fixed in the fitting hole 4b formed in the head 4a of the needle body 4 (FIG. 7). The hand sewing needle thus completed is shown in FIG.

In the present embodiment, in the fixing step, after the wrapped portion 1d is fitted into the fitting hole 4b formed in the head 4a of the needle body 4, the head 4a is swaged from the left and right. The diameter of the hole 4b is locally reduced, and the wound portion 1d is fixed so as not to be able to come out by the tightening force (see FIG. 7). The recess formed in the head 4a of the needle body 4 is a caulking recess 4c formed by the caulking. The caulking recess 4c may be partially formed on the left, right, front and rear of the head 4a, or may be formed over the entire circumference.
As the fixing means, there is use of an adhesive in addition to caulking.

In the method for manufacturing a hand sewing needle according to the present invention, the core wire 2 is sandwiched between the microfine steel wire 1 and the arc portion 1a, and the distal end portions 1c, 1c are sandwiched between the clamps 3 so as to form the core wire. 2
Is rotated a required number of times to form the through-hole 1e, so that the core member 2 becomes a jig for setting the shape of the through-hole 1e, and thus the through-hole 1e having an accurate shape can be always formed.

Further, both arm pieces 1b, 1b are wound around each other to form a winding portion 1d, and the winding portion 1d is fitted into the fitting hole 4b of the needle body 4, so that the fitting hole 4b is firmly inserted into the fitting hole 4b. Can be fixed. That is, by forming the winding portion 1d, irregularities are formed on the outer peripheral surface, and the frictional resistance with the fitting hole 4b is increased, whereby the fixing portion is firmly fixed so as not to come out.

In the fixing step, by caulking the head 4a of the needle main body 4, the inner peripheral surface of the fitting hole 4b bites into the concave portion of the winding portion 1d. Can be.

In the hand sewing needle formed by the method for manufacturing a hand sewing needle according to the present invention, the through hole 1e formed by the ultrafine steel wire 1 can be freely enlarged, so that the thread can be easily passed. In addition, since the through hole 1e made of the ultrafine steel wire 1 is easily elastically deformed, when the hand sewing needle is passed through a cloth or the like, the hand sewing needle can be passed without resistance similarly to the conventional hand sewing needle.

[0019]

According to the method for manufacturing a hand sewing needle according to the present invention, the ultrafine steel wire 1 is sandwiched between the arcuate portion 1a of the core 2 and the distal ends 1c, 1c by the clamp 3 so that the core is Since the through hole 1e is formed by rotating the tool 2 and the like a required number of times,
Is a jig for setting the shape of the through hole 1e, so that the through hole 1e having an accurate shape can always be formed.

The arms 1b, 1b are wound around each other to form a winding portion 1d, and the uneven winding portion 1d is fitted into the fitting hole 4b of the needle body 4, so that the fitting hole 4b is formed. Can be fixed firmly.

In the fixing step, by caulking the head 4a of the needle main body 4, the inner peripheral surface of the fitting hole 4b bites into the concave portion of the winding portion 1d, so that a stronger fixing is achieved. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view showing a bending step in the present invention.

FIG. 2 is a plan view showing a proximity step in the present invention (state before proximity).

FIG. 3 is a plan view showing a proximity step in the present invention (state after proximity).

FIG. 4 is a view showing a clamping step in the present invention;
(A) is a plan view and (b) is a side view.

FIG. 5 is a plan view showing a winding step in the present invention.

FIG. 6 is a plan view showing a cutting step in the present invention.

FIG. 7 is a plan view showing a fixing step in the present invention.

FIG. 8 is a front view showing a hand sewing needle formed according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Micro-fine steel wire 1a Arc part 1b Arm piece 1c Tip 1d Winding part 1e Through hole 2 Core 3 Nipping tool 3a Upper member 3b Lower member 4 Needle body 4a Head 4b Fitting hole 4c Caulking recess M-M Virtual axis

Claims (2)

[Claims] 1. An ultrafine steel wire (1) having an arc portion (1a)
Bends in a mountain-like shape with the two parts (1
b, 1b) forming a bending step, with the center piece (2) sandwiched between the arcs, further bending both arm pieces in the direction of approaching each other, and bringing the tips (1c, 1c) of both arm pieces closer to each other An approaching step in which the leading ends of both arm pieces are sandwiched by a sandwiching tool (3) composed of an upper member (3a) and a lower member (3b); The arm is rotated a required number of times about a virtual axis (M-M) passing through the middle point between the point and the tip, and the arms are wound around each other, and the through hole (1e) and the winding portion (1d) are wound. A winding step to be formed, a cutting step to cut a wound portion of the semi-finished product after the winding process to a required length, a fitting hole formed in the head (4a) of the needle body (4). (4b) A method for manufacturing a hand sewing needle, comprising a fixing step of fitting and fixing the needle. 2. In the fixing step, after the winding portion (1d) is fitted into a fitting hole (4b) formed in the head portion (4a) of the needle body (4), the head portion is swaged. The method for manufacturing a hand sewing needle according to claim 1, wherein the needle is fixed.