JP2531077B2 - String stopper, its manufacturing method and manufacturing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a cord stopper used for a carrying strap for small articles such as folding umbrellas, portable radios, portable cameras, portable telephones, etc., and a manufacturing method and manufacturing apparatus therefor. .

[0002]

2. Description of the Related Art Mainly, a hand strap provided for a mobile device is used by connecting two cords 21a and 21b formed in an annular shape on the mobile device side and the hand strap side, as shown in FIG. Conventionally, the stopper 20 that joins the straps forming the above-mentioned hand strap is made of a hard resin such as nylon or polypropylene as a material, and as shown in FIGS. , 21b are temporarily joined by welding or the like, and the resin is coated around the converged portion 21 by injection molding. In addition, the stopper 20 is generally communicated with the cord convergence point 21 from above and below, and the cord 2
By using the elasticity of 1a and 21b, the cord 21
A retaining groove 22 for preventing the removal of a and 21b is provided.

[0003]

However, since the conventional stopper 20 described above is made of a hard resin material, the stopper 20 comes into contact with a portable article made of a soft resin. However, there is a risk that the mobile device may be damaged by long-term use. Further, the retaining groove 22 provided in the stopper 20 is excellent in strength as the stopper 20 and is practically good, but it may impair the aesthetic sense in terms of design, and it may be an obstacle to markings or the like. There was a problem that there is also. further,
In the conventional manufacturing method, the resin may entrap dust and dirt attached to the surface of each string loaded in the mold during injection molding, resulting in scratches and stains on the outer surface, which may result in defective products. It was Further, even in the manufacturing apparatus, if accurate positioning cannot be performed, the resin coating becomes uneven, which also causes defective products.

Here, in order to solve the above problems, it is possible to solve each problem by using a soft resin for the material of the stopper. Since the strength is not sufficient and the string and the soft resin are flexible with each other, there arises a problem that the stopper is separated from the contact portion between the string and the stopper.

Therefore, in order to solve the above problems, the present invention provides a cord stopper which is suitable for practical use as a cord stopper without damaging portable articles and which is excellent in design. In addition, it is an object of the present invention to provide a manufacturing method and a manufacturing apparatus that minimize defective products.

[0006]

In order to achieve the above-mentioned object, a cord stopper according to the present invention is constructed so that the ends of the cords (3a, 3b) are converged and the converging point (3) is surrounded. In a string-like fastener (10) coated with a resin, a first molding portion (1) coated with a hard resin on the convergent portion (3) and protruding from the first molding portion (1). A projecting molding part (5) which is continuously molded and covers the periphery of the part where the string extends, and a soft part up to the outer peripheral surface of the projecting molding part (5) around the first molding part (1). It is characterized by comprising a second molding part (2) covered with a resin.

[0007]

In the manufacturing method of the present invention, the string (3
a, 3b) are converged, and in the method of manufacturing a string-like fastener (10) which is coated with a synthetic resin so as to surround the converged point (3), the converged point (3) is loaded. Along with the notch (6), the circumference of the string extending from the converging point (3) is covered with a projection forming part forming space of a predetermined width
Using a first die (6) equipped with b), the converging point (3) is loaded into the first die (6), and the converging point in the first die (6) is After filling the surrounding space and the projection forming portion forming space with a hard resin to cover the first molding portion (1) and the projection molding portion (5) around the converging portion (3),
At least a part of the first molding portion (1) and the protruding molding portion (5) is loaded into the second mold (7), and at least the first molding portion (1) and the protruding molding portion (5) are loaded. The second mold (7) is filled with a soft resin so as to surround a part thereof, and the second molding part (2) is formed around the entire circumference of the first molding part (1) and the protruding molding part (5). Is characterized in that it covers at least a part thereof.

Further, in the manufacturing apparatus of the present invention, the string (3
(a) and (3b) are converged, and in the manufacturing device of the string stopper (10) in which the synthetic resin is coated so as to surround the converged point (3), the converged point (3) is loaded. At the same time, a pressing portion (6a) for sandwiching the loaded converging point (3) from above and below is provided, and a protrusion of a predetermined width is formed around the string (3a, 3b) extending from the converging point (3). A first mold (6) having a notch (6b) covering the part forming space and a first molding part (1) molded by the first mold (6) are loaded. At the same time, the protrusion forming portion (5) of the first forming portion (1) formed by the protrusion forming portion forming space on the inner periphery of the cutout portion (6b) of the first mold (6) is positioned and fitted. A second mold (7) having a matching positioning groove (7a) is provided.

[0010]

The end portions of the cords (3a, 3b) are converged, and the converged portion (3) is positioned and loaded in the first mold (6) and inside the first mold (6). Is filled with hard resin to form the first molding portion (1). In addition, in the first molding part (1), a projection molding part (5) is formed by the notch part (6b) provided in the first mold (6), and the projection molding part (5) is formed. ) Is fitted in the positioning groove (7a) of the second mold (7) and positioned at a desired position. Then, the second mold (7) is filled with a soft resin to form the second molding portion (2), so that the fastener (3) at the converging point (3) of the string (3a, 3b). 10) is molded.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 (a) is a plan view showing an embodiment of a first molding portion of a cord stopper according to the present invention, FIG. 1 (b) is a sectional view taken along the line AA in FIG. 1 (a), and FIG. 2A is a plan view showing the second molding portion, and FIG. 2B is B in FIG. 2A.
FIG. 4 is a cross-sectional view taken along line B. In this embodiment, the ends of the first and second strings 3a and 3b formed in a ring shape are converged, and the first molding portion 1 covered with a synthetic resin so as to surround the convergence point 3 is formed. , And a second molding portion 2 covered with a synthetic resin so as to surround the first molding portion 1.

As shown in FIGS. 1 (a) and 1 (b), the first molding part 1 has cords 3a and 3b on the portable article side and the carrying side.
Ends are converged by temporary bonding such as welding, and the converged portion 3 is covered with a hard resin by injection molding. As in the prior art, the first molding portion 1 is provided with a retaining groove 4 for preventing the cords 3a and 3b from coming off, almost reaching the surface of the cord 3a. Around the strings 3a and 3b extending from the first molding portion 1, a protruding molding portion 5 covered with a hard resin by a predetermined width by injection molding is integrally formed with the first molding portion 1. There is.

As shown in FIGS. 2 (a) and 2 (b), the second molding portion 2 has, for example, urethane around the first molding portion 1.
A soft resin such as synthetic rubber is coated by injection molding. The second molding portion 2 covers the periphery of the first molding portion 1, but this coating does not affect the strings 3a and 3b extending from the protruding molding portion 5 of the first molding portion 1. The outer peripheral surface 5a of the protruding molding portion 5 is covered.

Therefore, in the cord stopper 10 constructed as described above, since the outer skin is covered with the soft resin, even if it comes into contact with the portable article molded of the soft resin, the portable article is damaged. Never. Then, the first molding unit 1
Since it is covered with a hard resin, it is possible to obtain sufficient strength in joining the strings. Further, since the second molding portion 2 covers irregularities such as the retaining groove 4 that appear on the surface of the first molding portion 1, the irregularities do not appear on the surface, and further The surface can be designed such as marks on the surface, and the second molding part 2
By changing the shape of, it is possible to design the shape of a character, for example. Also, the retaining groove 4
Increases the coating strength of the second molding part 2.

The second molding part 2 covered by the first molding part 1.
Is the outer peripheral surface 5a of the protrusion molding portion 5 formed of a hard resin.
Since the coating up to, there is no portion where the soft resin is applied to each of the cords 3a and 3b, and the flexibility of the cords 3a and 3b is absorbed by the protruding molding portion 5, so that the second molding portion 2 that is a soft resin is absorbed. The side is not affected, and the second molding portion 2 is not peeled off.

Further, by using the two-step processing method, if the first molding part 1 has a sufficient bonding strength, a product which has conventionally been defective due to a defective resin filling or the like can be used. By covering with the second molding portion 2, these defective states can be hidden, so that the number of substantially defective products can be reduced and the cost for generating defective products can be reduced.

By the way, in the above-described device for manufacturing a cord stopper, in the formation of the first molding part 1, the cords 3a, 3b converged by the temporary connection are positioned at the tip portions of some cords. Then, as shown in the cross-sectional view of FIG. 3, the first mold 6 is loaded. The first mold 6 has an inner shape that follows the outer shape of the first forming portion 1, and holds the converging point 3 on the inner wall from above and below to position the converging point 3 at the center. A part 6a is provided. Further, in the first die 6, a notch having a protrusion forming portion forming space of a predetermined width in order to form the above-described protrusion forming portion 5 around the strings 3a and 3b extending from the converging portion 3. A part 6b is provided. Then, a hard resin is injected into the first mold 6 to cover and form the first molding portion 1.

In the second molding, as shown in FIG.
The first molding unit 1 molded by the first mold 6 is loaded into the second mold 7. The second mold 7 has an inner shape that conforms to the outer shape of the second molding portion 2, and the protruding molding portion 5 of the first molding portion 1 is provided at the portion where the respective cords 3a and 3b extend. Is formed with a positioning groove 7a. Then, the protruding molding part 5 of the first molding part 1 has the positioning groove 7 a of the second mold 7.
The second mold 7 while being fitted and positioned in the
The soft resin is injected into the second molding part 2 to form a coating.

Therefore, according to the manufacturing apparatus for the cord stopper 10 described above, the protruding molding portion 5 of the first molding portion 1 and the second molding portion 5
With the positioning groove 7a provided in the mold 7, the positioning in the second mold 7 is easily performed, and the second molding portion 2
Since it can be molded, a high-quality molded product can be easily obtained. Further, since the second mold 7 does not have a portion that protrudes into the molding space, such as the pressing portion 6a provided in the first mold 6, the resin flow inside the mold is good,
No defective filling will occur.

By the way, in the above-mentioned embodiment, the ends of the two cords 3a and 3b are converged, and the converged portion 3 is covered with the synthetic resin, whereby the first forming portion 1 and the second forming portion 2 are formed. Although formed, the ends of one string formed in advance in an annular shape may be temporarily joined together at any position on the surface of the string, and the forming portions 1 and 2 may be formed on this part by coating.
The same effects as in the above-described embodiment can be obtained. Further, the above-described stopper 10 can also be used as a connecting tool for connecting the respective ends of the string, and even in this case, it has sufficient strength as a connecting tool for the string and has flexibility on the surface. Keep
Further, it is possible to obtain an effect excellent in designability.

[0021]

As described above, in the cord stopper according to the present invention, the ends of the cords are converged, and the converged portion is made of a soft material around the first molding portion coated with the hard resin. By providing the second molded portion formed by coating with resin, it has sufficient strength as a stopper and maintains flexibility on the surface,
Further, it is possible to obtain a string-like fastener having no irregularities and excellent in design. Further, since the periphery of the first molding portion is covered with the second molding portion made of a soft resin, even if the first molding portion has some shape defect, the second molding portion can compensate for it. Furthermore, since the bending of the string is fixed by the protruding molded part made of hard resin, it does not affect the side of the second molded part made of soft resin, and the second molded part on the surface and the outer periphery of the string are not affected. There is no appearance such as a gap between them. Further, according to the manufacturing method and the apparatus of the present invention, in the first mold for forming the first molding portion, the notch that covers the periphery of the portion where the cords extend through the formation space having the predetermined width. A first molding portion by covering the projection molding portion that continuously projects from the first molding portion and positioning the projection molding portion in the second mold so as to fit with the projection molding portion. Can be easily positioned and loaded in the second mold, and thereby defective products due to uneven filling of the resin can be reduced and high-quality molded products can be obtained. Furthermore, since the second mold does not have a portion that projects into the molding space, the resin flows well inside the mold and filling failure does not occur.

[Brief description of drawings]

FIG. 1 (a) is a plan view showing an embodiment of a first molding part of a cord stopper according to the present invention. (B) The sectional view on the AA line in FIG.

FIG. 2A is a plan view showing a second molding portion. 2B is a sectional view taken along line BB in FIG.

FIG. 3 is a sectional view showing an apparatus for manufacturing a first molding unit.

FIG. 4 is a sectional view showing an apparatus for manufacturing a second molding unit.

FIG. 5 is a perspective view showing a schematic configuration of a strap fastener.

FIG. 6 is a plan view of a conventional cord stopper.

FIG. 7 is a sectional view taken along line CC in FIG.

[Explanation of symbols]

1 ... 1st shaping | molding part, 2 ... 2nd shaping | molding part, 3 ... convergence part, 3
a, 3b ... strings, 4 ... prevention groove, 5 ... projection molding portion, 5a
... outer peripheral surface, 6 ... first mold, 6a ... pressing part, 6b ... notch part, 7 ... second mold, 7a ... positioning groove.

Claims (3)

(57) [Claims] 1. A fastener for a string formed by converging an end portion of a string and coating and molding a synthetic resin so as to surround the converged part, wherein the converged part is covered with a hard resin.
A molding part, a projection molding part that is continuously molded by projecting from the first molding part and covers the periphery of the part where the string extends, and an outer peripheral surface of the projection molding part around the first molding part. And a second molding part covered with a soft resin. 2. A method for manufacturing a string stopper in which ends of a string are converged and synthetic resin is coated so as to surround the converged part , wherein the convergent part is loaded and extends from the convergent part.
Around the string to be ejected through a projection forming part forming space of a predetermined width
Using a first mold having a notch portion for covering with the above, the converging portion is loaded in the first mold, and the collecting in the first mold is performed.
Hard resin in the space that surrounds the bunch and the space where the protrusions are formed
And filled with a projection forming portion and the first mold portion after coating around the convergence point, the protruding mold portion first molding portion low
At least a part is loaded into the second mold, and
A soft resin is filled in the second mold so as to surround at least a part of the protruding molding portion , and the second molding portion is replaced with the first molding portion.
A method of manufacturing a fastener for cords, which comprises covering the entire circumference of the cord and the periphery of at least a part of the protruding molded portion . 3. An apparatus for manufacturing a string stopper in which ends of cords are converged and synthetic resin is coated so as to surround the convergence points, and the convergence points are loaded and loaded. A first mold having a notch part that has a pressing part that sandwiches the convergent part from above and below, and that covers the periphery of the string extending from the convergent part through a projection forming part forming space of a predetermined width. A first molding part molded by the first mold, and a projection molding of a first molding part molded by the projection forming part forming space on the inner circumference of the cutout part of the first mold. And a second die having a positioning groove for positioning and fitting the portion.