JP3092018B2 - Method and apparatus for forming end of flexible cord - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end molding method and an apparatus for molding a synthetic resin material at the end of a flexible cord.

[0002]

2. Description of the Related Art A molding process for solidifying the end of a string with a synthetic resin and a molding for molding a desired molded product on an end of a band are known. As shown in FIG. 2, when the molded article 2 is formed on the end 1a of the flexible string 1 of this type, the end 1a of the string 1 is used as an insert as shown in FIG. In general, a method of accommodating the resin in the engraving space 4 of the mold 3 and injecting the resin into the engraving space 4 has been adopted.

[0003]

In such a prior art, the end of the flexible cord is housed in a mold engraving space to form an insert. Because of this, the handling of the string-shaped body is troublesome, and there is a problem that the work of inserting and fixing the insert at a predetermined position in the die-cut space is troublesome.

[0004] Moreover, when the resin is injected into the die-sinking space,
Since the end of the cord-like body oscillates or is pressed against one side by the flow of the resin, the molded article is difficult to be accurately positioned with respect to the cord-like body, so that there is also a problem that defective products frequently occur. . In addition, in the case where the forming process is performed on both ends of the string-like body, it is necessary to perform two successive forming processes, so that there is a problem that the continuous processing is difficult.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems such as inconvenience of handling when the string itself is used as an insert in the end forming of the flexible string according to the prior art. Along with forming a pair of primary molded articles at a predetermined interval on a continuous flexible cord-like body, a connecting portion connecting the pair of molded articles is simultaneously molded, and in the next step, the pair of primary molded articles is formed. The partial cord-like body between the two is cut and removed near the opposing inner sides of the pair of molded articles while leaving the connecting part, and then the primary molded article is wrapped around the cut end of the cord-like article to perform secondary molding. The above problem is not solved by forming a product, and finally, by cutting and removing a connecting portion connecting the pair of formed products near the inside of the pair of formed products facing each other. is there.

[0006]

According to the above-mentioned structure of the present invention, the continuous flexible cord-like bodies are attached to the mold engraving space as inserts in a state where a certain amount of tension is applied, and are connected to each other. A pair of primary molded articles at a predetermined interval connected by the part is formed on this cord, and after the mold is opened, the primary molded cord is moved, and in the next step, the connection part is left. Then, the partial string-shaped body between the pair of primary molded articles is cut and removed in the vicinity of the opposed inside of the pair of molded articles, and then, the string-like body in the connected state is moved to the next step via the connecting portion. Here, the cut end of the cord-like body and the primary molded product are wrapped and subjected to secondary molding, and after the mold is opened, this is moved, and finally, the connecting portion connecting the two molded products to each other is paired. By cutting and removing near the opposite inside of the molded product of the above, a continuous molding process is performed on the end of the flexible cord. It is intended to act on the Suyo.

[0007]

Next, an embodiment of the present invention will be described with reference to FIGS.

FIG. 3 is a schematic view of an apparatus embodying the present invention. The apparatus includes a primary molding machine 5, a cord-like material cutting machine 6, a secondary molding machine 7, and a connecting part cutting machine. Machine 8. The continuous flexible cord 1 is unwound from the stock reel 9 and flows continuously in the order of the primary forming machine 5, the cord cutting machine 6, the secondary molding machine 7, and the connecting portion cutting machine 8. Finally, the molded product is collected in the collection box 10.

FIG. 4 shows details of each step. In the primary molding step shown in FIG. 4, a pair of primary molding cavities 13 and 13 are engraved in the mold 12. ,
The engraving spaces 13, 13 are connected to each other by an engraving space 14 for forming a connecting portion. It should be noted that the die-forming space 1 for forming the connection portion
It is practical that 4 has a structure also serving as a runner portion. Here, the flexible cord-shaped body 1 moves on the mold 12 under a state where a certain amount of tension is applied, and is inserted into the pair of engraving spaces 13, 13 while traversing the mold 12. It is positioned as an object and stored here. Next, primary molding is performed by injecting resin into the primary molding die-sinking spaces 13, 13.

When the primary molding is completed, the string 1 is transferred after listening to the mold, and as shown in FIG. 5, a pair of primary molded articles 15, 15 formed on the string 1 at predetermined intervals. Is
In a state of being connected by the connecting portion 16, it is transferred to the cord-like body cutting machine 6 as shown in FIG. 3. Here, the cutter 1 of the cutting machine 6
7, the partial string-like body 1b between the pair of primary molded products 15, 15 is connected to the pair of molded products 15,
15 are cut and removed near the opposing inner side. FIG. 6 shows a state after the partial string-like body 1b has been cut and removed, and a pair of primary molded articles 15, 15 are formed on the end 1a of the string-like body 1, and these molded articles 15, 15 are joined together. Are connected by a connecting portion 16, and the string-like body 1 maintains continuity and can be integrally transferred. In the meantime, in the primary molding machine 5 in the previous step, the primary molding is performed on other portions of the cord-like body 1.

[0013] The primary molded products 15, 15 from which the partial cord-like members 1 b have been cut and removed, are then conveyed to the secondary molding machine 7. In FIG. 7, a pair of secondary molding engraving spaces 19, 19 are engraved in the secondary molding die 18, and the end 1 a of the string-shaped body 1 and the primary molded product 15 are formed here. It is positioned and accommodated as an insert. Here, secondary molding is performed,
As shown in FIG. 8, a secondary molded product 20 is molded around the end 1 a of the string-shaped body 1 by enclosing the primary molded product 15.

After the secondary molding, as shown in FIG. 8, the molded product carried to the connecting portion cutting machine 8 is
1 and 21, the connecting portion 16 is formed into a pair of molded products 20 and 2
0 is cut and removed near the opposing inner side and discarded.

In this manner, as shown in FIG. 9, the end 1a of the flexible cord 1 is formed to obtain a final product having the molded product 20. In addition, the string-like body 1 in the above embodiment has no particular restrictions on its shape.
Various cross-sectional shapes such as a square string may be used. Of course, it may be a strip.

[0014]

As described above, according to the present invention, the primary molded articles connected to each other at the connecting portions are formed at two places at a predetermined interval on the continuous flexible cord. In
An excellent effect is exerted in that a certain degree of tension is applied and the handling thereof is significantly easier. In addition, at the time of the primary molding, the consistency of the position of the mold with respect to the engraving space is good,
There is no displacement of the cord in the molding space during molding.

In addition, in the primary molding, since a connecting portion for connecting the primary molded products is formed at the same time, a partial string-like material between the primary molded products is cut and removed in a subsequent cord-like material cutting step. Even if it is performed, the string-like body can be transferred integrally while maintaining continuity, and there is no hindrance to the transfer to the next step.

In the subsequent secondary molding, since the end of the cord-like body and the primary molded product form an insert, the handling of the insert is further improved, and the positioning of the insert within the molding space is ensured. It is simple and easy, and since there is no displacement between the secondary molded product as the final product and the string at the time of injection molding, the occurrence of defective products due to the displacement of the string is completely avoided. it can. In this way, the continuous forming to the end of the flexible string can be performed. In particular, even if the string is formed at both ends of the string, it can be easily formed by a series of continuous operations. Is possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conventional molded product,

FIG. 2 is a top view of a mold showing a conventional molding means,

FIG. 3 is an overall view of a molding apparatus,

FIG. 4

FIG. 5

FIG. 6

FIG. 7

FIG. 8

FIG. 9 is an operation explanatory view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible string body 5 Primary molding machine 6 String-shaped object cutting machine 7 Secondary molding machine 8 Connection part cutting machine 12 Primary molding die 13 Primary molding die-cutting space 14 Connection part molding die-forming space 15 Primary Molded product 16 Connection part 17 Cutter 18 Secondary molding required mold 19 Secondary molding die-sinking space 20 Secondary molded product 21 Cutter

Claims (2)

(57) [Claims] 1. A primary forming step of forming a pair of primary molded products 15 and 15 connected to each other by a connecting portion 16 at two places at a predetermined interval of a continuous flexible cord 1; And a pair of cut ends 1a of the string 1 and a pair of cut ends 1a of the string 1 are cut in the vicinity of the inside facing the molded articles 15, 15. And a pair of secondary molded products 20 enclosing the primary molded products 15
20 and a pair of secondary molded articles 2
A connecting portion cutting step of cutting and removing a connecting portion between 0 and 20 near the inner sides of the pair of molded products 20 and 20 facing each other. 2. A mold forming space for forming a connecting portion which has a pair of mold forming spaces for primary molding for accommodating a continuous flexible cord as an insert, and which communicates with each other. A primary molding machine 5 having the first and the second primary moldings 15 formed by the primary molding machine 5 and a string-like body 1b cut between the pair of primary moldings 15 near the inside of the moldings 15, 15 facing each other. It has a body cutting machine 6, a pair of secondary molding cavities 19, 19 for accommodating a pair of cutting ends 1a of the string-shaped body 1 and a pair of primary molded products 15, 15 as inserts, and cutting. A secondary molding machine 7 that wraps the end portion 1a and the primary molded products 15 and 15 to form the secondary molded products 20 and 20 and a connecting portion 16 between the pair of secondary molded products 20 and 20
And a connecting portion cutting machine 8 for cutting and removing near the inner sides of the flexible cords 0 and 20.