JPH04275117A - Method and apparatus for molding end part of flexible string like body - Google Patents

Abstract

PURPOSE:To transfer a string like body after cutting to a mold cavity for secondary molding by molding a primary of primary molded products on the string like body when the flexible string like body is used as insert matter to apply the molding of a resin to the end part of said string like body and subsequently cutting the string like body to firmly receive the string like body before cutting in the mold cavity as the insert matter while pulling the strip like body through the connection part connecting a pair of the molded products. CONSTITUTION:A pair of primary molded products 15 are formed to a flexible string like body 1 at a predetermined interval so as to be integrally accompanied by the connection part 16 connecting both molded products and, in the next process, the partial string like body 1b between the primary mold products 15 is cut and removed and, further, in the succeeding process, secondary molded products 20 are formed to the cut end parts 1a of the string like bodies 1 so as to cover the primary molded products and, finally, the connection part 16 between the primary molded products 15 is cut and removed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end forming method and apparatus for forming a synthetic resin material onto the end of a flexible string-like body.

0002

[Prior Art] Molding processes for hardening the ends of a string-like body with synthetic resin and molding processes for forming a desired molded product on the ends of a band-like body are known. When molding a molded product 2 on the end 1a of this kind of flexible string-like body 1 as shown in FIG.
Generally, a method has been adopted in which a is housed as an insert in the engraving space 4 of the mold 3, and resin is injected into the engraving space 4.

0003

[Problems to be Solved by the Invention] In this prior art, the end of the flexible string-like body is accommodated in the engraving space of the mold to form an insert. As a result, handling of the string-like body is troublesome, and the work of inserting and fixing the insert into a predetermined location within the die-carving space is time-consuming.

[0004] Moreover, when injecting the resin into the mold-carving space,
There was also the problem that the resin flow caused the end of the string to swing or be pressed to one side, making it difficult to accurately position the molded product relative to the string, resulting in a high number of defective products. . Furthermore, when forming both ends of the string-like body, two successive forming operations are required, making continuous processing difficult.

[0005]

[Means for Solving the Problems] The present invention has been made in view of the problems such as the inconvenience of handling when the string-like body itself is used as an insert in the end forming of a flexible string-like body according to the above-mentioned prior art. , a pair of primary molded products are molded at a predetermined interval on a continuous flexible string-like body, and a connecting part connecting these pair of molded products is also molded at the same time, and in the next process, these pair of primary molded products are molded. The partial string-like body between them is cut and removed near the opposing inner sides of the pair of molded products while leaving the connection part, and then the primary molded product is wrapped around the cut end of the string-like body to perform secondary molding. This method attempts to solve the above-mentioned problems by molding the molded products and finally cutting and removing the connecting portion connecting the pair of molded products near the opposing inner sides of the pair of molded products. be.

[0006]

[Operation] In the above structure of the present invention, a continuous flexible string-like body is placed under a certain degree of tension as an insert in the engraving space of a mold, and connected to each other. A pair of primary molded products connected at a predetermined interval are molded onto this string-like body, and after the mold is opened, the primary-formed string-like body is moved, and in the next process, the connected part remains. The partial string-like body between the pair of primary molded products is cut and removed near the opposing inner sides of the pair of molded products, and then the connected string-like body is moved to the next process via the connecting part. Here, the cut end of the string-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 part that connects both molded products is made into a pair. By cutting and removing near the opposing inner sides of the molded product, continuous molding is performed on the ends of the flexible string-like body.

[0007]

[Embodiment] Next, an embodiment of the present invention will be described below based on the drawings from FIG. 3 onwards.

FIG. 3 shows an overview of an apparatus for carrying out the present invention. machine 8. A continuous flexible string 1 is unwound from a stock reel 9 and continuously flows through a primary forming machine 5, a string cutting machine 6, a secondary forming machine 7, and a joint cutting machine 8 in the stated order. Finally, the molded product is collected into the collection box 10.

Details of each process are shown in FIG. 4 and below. In the primary forming process shown in FIG. ,
The molding spaces 13, 13 are communicated with each other through a molding space 14 for molding the connecting portion. In addition, die-carving space 1 for forming the connecting part
It is practical that 4 has a structure that also serves as a runner part. Here, the flexible string-like body 1 is moved onto the mold 12 under a certain degree of tension, and is inserted into the pair of mold-carving spaces 13, 13 while crossing the mold 12. It is positioned as an object and housed here. Next, primary molding is performed by injecting resin into the molding spaces 13, 13 for primary molding.

When the primary molding is completed, the string-like body 1 is transferred after the molding, and as shown in FIG. teeth,
The string-shaped body cutting machine 6 as shown in FIG. Here, cutter 1 of cutting machine 6
7, the partial string-like body 1b between the pair of primary molded products 15, 15 is a pair of molded products 15 connected by a connecting portion 16,
15 is cut and removed near the opposing inner sides. The state after cutting and removing the partial string-like body 1b is shown in FIG. are connected by a connecting part 16, and the string-like body 1 maintains continuity and can be transported as one piece. In addition, during this time, other parts of the string-like body 1 are subjected to primary forming processing in the primary forming machine 5 in the previous step.

The primary molded products 15, 15 from which the partial string-like bodies 1b have been cut and removed are then conveyed to the secondary molding machine 7. In FIG. 7, a pair of secondary molding spaces 19, 19 are carved in the secondary molding die 18, and the end portion 1a of the string-like body 1 and the primary molded product 15 are inserted here. It is positioned and accommodated as an insert. Secondary forming is performed here,
As shown in FIG. 8, a secondary molded product 20 is formed at the end portion 1a of the string-like body 1 so as to wrap around the primary molded product 15. As shown in FIG.

After the secondary molding, the molded product is transported to the connection cutting machine 8 as shown in FIG.
, 21, the connecting portion 16 connects to the pair of molded products 20, 20.
It is cut off and discarded near the opposing inner side.

In this way, as shown in FIG. 9, the end portion 1a of the flexible string-like body 1 is molded, and a final product comprising a molded article 20 is obtained. Note that the string-like body 1 in the above embodiment has no particular restrictions on its shape, and may be a round string,
It may have various cross-sectional shapes such as a square string. Of course, it may also be a band-shaped body.

[0014]

[Effect] As described above, according to the present invention, primary molded products connected to each other at the connecting portions are molded at two locations at a predetermined interval on a continuous flexible string-like body, so that the string-like body for,
A certain degree of tension is applied, and the excellent effect is that handling becomes much easier. In addition, the positional consistency of the mold with respect to the engraving space during primary molding is good,
The string-like body does not shift in position within the die-cutting space during molding.

In addition, in the primary molding, connecting parts for connecting the primary molded products are also molded at the same time, so in the subsequent string cutting process, the partial strings between the primary molded products are cut and removed. Even if the string-like body is transferred, it can still maintain its continuity and be transferred in one piece, and there is no problem in transferring it to the next step.

[0016] In the next secondary forming, since the end of the string-like body and the primary molded product become an insert, the handling of the insert becomes even better, and the positioning of the insert in the die-cutting space is ensured. Moreover, it is simple, and since there is no misalignment between the final product (secondary molded product) and the string-like body during injection molding, the occurrence of defective products due to misalignment of the string-like body is completely avoided. can. In this way, it is possible to continuously form the ends of a flexible string-like object, and in particular, even if both ends of the string-like object are to be formed, it is easy to form them in a series of continuous operations. It is possible to play an excellent performance.

[Brief explanation of the drawing]

[Figure 1] Cross-sectional view of a conventional molded product,

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

[Figure 3]
Overall overview of the molding equipment,

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

FIG. 9 is an explanatory diagram of operation.

[Explanation of symbols]

1 Flexible string-like body 5 Primary molding machine 6 String material cutting machine 7 Secondary molding machine 8 Connection cutting machine 12 Primary molding mold 13　Die engraving space for primary forming 14　Die engraving space for forming the connection part 15 Primary molded products 16 Connecting part 17 Cutter 18　　　Mold required for secondary forming 19 Die engraving space for secondary forming 20 Secondary molded products 21 Cutter

Claims (2)

[Claims] 1. A primary molding step of molding a pair of primary molded products 15, 15 connected to each other by a connecting portion 16 at two locations at a predetermined interval on a continuous flexible string-like body 1; A string-like body cutting step of cutting the partial string-like body 16 between the primary molded products 15, 15 near the opposing inner sides of the molded products 15, 15, and a pair of cut ends 1a of the string-like body 1 and a pair of A pair of secondary molded products 20 are created by wrapping the primary molded products 15 and 15.
, 20, and a pair of secondary molded products 2.
1. A method for forming an end of a flexible string-like body, comprising: cutting and removing a connecting portion between the molded articles 20 and 20 near the opposing inner sides of the pair of molded articles 20 and 20. [Claim 2] A pair of primary molding molding spaces 13, 13 that accommodate continuous flexible string-like bodies as inserts.
and a partial string-like body between a pair of primary molded products 15, 15 formed by the primary molding machine 5. 1b, near the opposing inner sides of the molded products 15, 15, and the pair of cut ends 1a of the string 1 and the pair of primary molded products 15, 15 as inserts. a pair of secondary molding machines 7 that have a pair of secondary molding molding spaces 19, 19 for accommodating the cut ends 1a and the primary molded products 15, 15 to form secondary molded products 20, 20; The connecting portion 16 between the secondary molded products 20 and 20 of the molded product 2
A device for forming an end of a flexible string-like body, comprising a connecting portion cutter 8 for cutting and removing near the opposing inner sides of wires 0 and 20.