JPS63171236A - Production of sewing needle - Google Patents

Abstract

PURPOSE:To permit mass production of sewing needles having spring holes with fewer stages by forging the head part of a needle material to form a flat head part, then blanking and removing a hole part and yarn inlet. CONSTITUTION:The head part of the needle material 1 is forged to form the flat head part, The part (a) intended to form the hole 5, the part (b) intended to form the yarn inlet and the part b' intended to form a yarn escape groove 7 are constituted to a small thickness and the part (c) intended to form hole columns 8 and lugs 9 on both sides is formed to a large thickness. The thin part is blanked by blanking dies by which the hole 5 and the yarn inlet 6 are integrally bored and the yarn escape groove 7 is formed. The outside edge of the part (c) intended for forming the columns 8 and the lugs 9 is further removed by grinding, by which the sewing needle having the spring hole is prepd. The hole 5, the yarn inlet 6 and the yarn escape groove 7 are thereby exactly formed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing an eyed suture needle having a bullet hole.

<Prior art> In the conventional manufacturing of this type of suture needle, for example, Japanese Patent Publication No. 55-39337 or Figs. 1(A) to (D)
) As shown in (), after a hole 2 is punched in the head of the needle material 1 by adopting a special method, a triangular cutting process is performed to form a thread entrance 3, and then a thread entrance 3 is formed. The yarn escape groove 4 was formed by cutting.

<Problems to be Solved by the Invention> However, in this type of conventional method, three steps are required for punching the head of the needle material 1 and then punching out the hole, and further steps are required to complete the suture needle. To achieve this, three processes are required: triangular cutting, edge cutting, and yarn speed groove processing, resulting in a total of seven processing steps, and each process in the conventional method is extremely complicated. It required skill, had poor work efficiency, and had drawbacks such as the inability to mass-produce uniform products.

The present invention fundamentally improves these conventional drawbacks, and in particular relates to a technology that makes it possible to mass-produce uniform products at low cost with extremely few processing steps.

<Means for Solving the Problems> The present invention involves forging the entire head of the needle material to form a flat head, thereby forming the intended portions of the hole post and ears into a thick wall portion, and forming the hole. A suturing needle in which a part and a planned part of the thread advancement and thread entrance that are continuous thereto are made thinner than the thick part, and then the hole part and the thread entrance are cut out by punching to form an bullet hole in the flat head. This is a manufacturing method.

Function> As described above, the present invention comprises forging the entire head of the needle material, forming a thick wall part on the flat head as the intended part of the hole post and the ear part, and forming a thread that communicates with the hole. A thin wall portion is formed as a planned portion for the quick groove and thread entrance, and the hole and thread entrance are punched and cut to form an bullet hole in the flat head. It can be constructed by processing.

In addition, in the process of forming the bullet holes, the style, ears, and yarn grooves can be formed at the same time, and the entire process of forming the head of the needle material can be easily and reliably carried out automatically. I can do it.

<Example> To specifically explain an example of the method according to the present invention with reference to the drawings, in FIGS. 2(A) to (E), first, FIG.
The outer diameter of the head shown in A) is 0.3 to 1.

By forging the head of the needle material 1 of 3ff111, the whole is formed into a flat head as shown in FIG. 2(B). At this time, the portion a where the hole 5 is to be drilled, the portion where the yarn entrance 6 is planned to be formed, and the portion b' where the yarn speed groove 7 is planned to be formed are each 0.05 to 0.27 m (approximately 4 m of the outer diameter of the head). (1/3 or less), and these thin parts a and b
, b', and the portion C where the style 8 and ears 9 are to be formed is made to have a wall thickness of 0.18 to 0.96++a (approximately one-half or more of the outer diameter of the head).

Next, among the thin parts a, b, and b'' of the head of the needle material 1 which has been forged into a flat shape as described above, the part a where the hole is to be drilled and the part where the thread entrance is to be formed are shown in FIG. ) By punching and cutting with a cutting die having a certain blade shape as shown in FIG. 2(D), a hole 5 and a yarn entrance 6 as shown in FIG. It is possible to do this, and the same figure (D)
The shaded part, that is, the outer edge part of the part C where the style 8 and ear part 9 are to be formed, is cut off by grinding to a predetermined width to obtain an eyed suture needle having a bullet hole as shown in FIG. 2(E). can be produced.

Depending on the method according to the present invention, the head of the needle material 1 is formed into a flat shape by forging, and in particular, the hole 5 and the thread entrance 6 are formed into a flat shape.
and planned portions a and b of yarn speed groove 7.

b' can be made to have a wall thickness of about one-fourth or less of the outer diameter of the head of the needle material 1, so this part can be easily and accurately cut out with a blade having a certain shape. This allows the hole 5, the yarn entrance 6, and the yarn speed groove 7 to be formed easily and accurately.

In addition, when forging the flat head, it is necessary to extend the flat thick part in the direction of the needle tip, or to make the outer side of the style part C thinner during forging, and to make the hole 5 and the thread entrance thinner. 6 are cut out separately, or the hole 5 and the thread entrance 6 are cut out separately.
Needless to say, the process can be carried out with appropriate modifications, such as cutting the opening with a separate thin cutter in order to smooth the communication.

<Effects of the Invention> As described above, in the method according to the present invention, the head of the needle material is forged to form a flat head having a thick wall part and a thin wall part, and the thread entrance and hole periphery are removed. The head of the needle material can be formed at the same time as the cutting part for the thread entrance and the thin wall part for the thread escape groove.Next, by punching and cutting this flat head with a blade mold having a certain shape, the head of the needle material can be formed at the same time. It is possible to simultaneously form the thread entrance and yarn speed groove in the part and drill the bullet hole, so the bullet hole can be constructed in two steps, and finally the outside of the style is ground and shaped. As a result, suturing needles can be manufactured using less than half the processing steps of conventional methods.

Furthermore, the method according to the present invention does not require any formal processing in the micro holes or cutting to form thread grooves around the thread entrance, as is the case with the conventional method. Since a series of processes such as cutting, cutting, and grinding are performed automatically, the needle material can be mass-produced reliably, easily, and inexpensively with extremely high precision.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional method, and FIG. 2 is a simplified explanatory diagram showing a method according to the present invention. 1 is a needle material, 2 and 5 are holes, 3 and 6 are thread entrances, 4.7 are thread grooves, 8 is a style, and 9 is an ear. Patent applicant Matsutani Seisakusho Co., Ltd. Agent Patent attorney Shukichi Nakagawa Figure 1 (A) (C)

Claims (1)

[Claims] By forging the entire head of the needle material to form a flat head, the intended portions of the hole post and ears are formed into a thick part, and the hole and the thread escape groove and thread entrance that are continuous with the hole are formed. A method for manufacturing a suture needle, comprising making the intended portion thinner than the thick portion, and then punching out the hole and the thread entrance to form a bullet hole in the flattened head.