JP3381376B2 - Coil bobbin manufacturing apparatus and manufacturing method using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a coil bobbin used for a coil or a transformer and a manufacturing method using the same.

[0002]

2. Description of the Related Art In recent years, along with the miniaturization and high performance of coils and transformer products, the coil bobbins used for them have also been miniaturized, and the material of the coil bobbins is a composite material of ferrite and resin for improving the characteristics. And so on.

On the other hand, as a method of winding the wire on the coil bobbin, instead of winding the coil 2 on the individual bobbin 1 as shown in FIG. 3, a plurality of bobbins are linearly formed as shown in FIG. The coil 2 is continuously wound on the rod-shaped bobbin 3 formed continuously, and is directly cut into individual pieces through the subsequent steps, thereby significantly improving the winding and carrying steps. It was designed.

[0004]

However, in the above-mentioned conventional structure, the coil bobbin 1 is fragile because the material forming the coil bobbin 1 is a composite material of ferrite and resin. Therefore, a plurality of bobbins are linearly continuously connected. In addition to being difficult in terms of strength, it has a problem that it is very difficult to handle since it is likely to be broken or broken in a subsequent process such as winding or packaging.

The present invention solves this problem and provides a coil bobbin manufacturing apparatus and a manufacturing method using the coil bobbin capable of continuously winding a plurality of linearly formed bobbins. The purpose is to do.

[0006]

In order to solve this problem, a coil bobbin manufacturing apparatus of the present invention comprises a plurality of coil bobbins each having a winding core portion around which a coil is wound and flange portions provided at both ends of the winding bobbin. Cavity part forming a cavity for molding the coil bobbin connected body continuously formed, and core material positioning for insert-molding a linear core material made of resin or glass in the central part of the coil bobbin connected body And a back tension part for applying tension to the core material at the time of insert molding, and an injection part for filling the cavity part with the melted material.

[0007]

With this configuration, it becomes possible to insert-mold a linear core material made of resin or glass into the center of a coil bobbin connecting body in which a plurality of coil bobbins are continuously formed in a straight line. Therefore, the above-mentioned coil bobbin connected body can greatly improve the strength against breakage or breakage.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing an apparatus for manufacturing a coil bobbin according to the embodiment, and FIG. 2 shows a coil bobbin assembly obtained by the apparatus.

In FIGS. 1 and 2, 4 is an upper mold part of a molding die, 5 is a lower mold part thereof, and a plurality of coil bobbins are linearly continuous to the upper mold part 4 and the lower mold part 5. A cavity portion 8 having a cavity portion for molding the coil bobbin coupling body 11 having a length L formed by forming the cavity portion 8 is provided, and a runner portion 9 is provided to fill the molten material into the cavity portion 8.

Further, 10 is the above-mentioned coil bobbin connecting body 11
Is a core material that is insert-molded into the coil bobbin connection body 11 as a reinforcing material and a connection material. The core material 10 needs to be non-conductive from the viewpoint of product characteristics, and a resin or glass wire rod is used. There is.

Reference numeral 6 is a guide block for positioning the core material 10 at a fixed position in the cavity portion 8 so that the core material 10 is not displaced during the insert molding, and 7 is attached to the core material 10 so that the core material 10 does not sag. A back tension unit for applying tension.

The operation of the coil bobbin manufacturing apparatus of the present invention constructed as above will be described below.

First, the core material 10 is inserted into the lower mold part 5. At this time, the core material 10 is positioned at a predetermined position by the guide block 6 and the back tension unit 7 and, at the same time, is tensioned and fixed.

Next, the upper mold part 4 and the lower mold part 5 are closed, and the length L is provided with a cavity for molding the coil bobbin connecting body 11.
As shown in FIG. 2, the cavity portion 8 of FIG. 2 is injected and filled with the composite material of ferrite and resin, which is the material forming the coil bobbin connecting body 11, from the injection portion 4a provided in the upper mold portion 4 via the runner portion 9. In this way, the coil bobbin connected body 11 including n individual coil bobbins is molded.

Next, after the coil bobbin connecting body 11 thus formed is projected and taken out, the coil bobbin connecting body 11 together with the core member 10 has a dimension L + 1 shown in FIG. 2 (where l is the coil bobbin connecting body 11). The distance is a distance between them, which can be set arbitrarily), and then the core material 10 is inserted into the lower mold part 5 again, and the above operation is repeated to perform injection molding.

By repeating this operation, the coil bobbin connecting body 11 is formed in the coil bobbin connecting body 11 through a certain non-molding section (only the core material 10) 1 in the form shown in FIG.
Can be obtained continuously.

In the coil bobbin connecting body 11 of FIG. 2, 12 is a winding core portion of the coil bobbin piece, and 13
Is a collar portion formed at both ends thereof, but the collar portion 13 is not particularly required, and the material forming the coil bobbin connecting body 11 does not need to be a composite material, and even if only a resin material is used, It goes without saying that if the characteristic deterioration is within the permissible level, it can be acceptable.

[0019]

As described above, in the coil bobbin manufacturing apparatus and the manufacturing method using the coil bobbin according to the present invention, the core material insert-molded into the coil bobbin is reinforced against the coil bobbin of the brittle material containing ferrite and the like. It has a structure with extremely high strength against breakage and breakage, and since the coil bobbin connecting bodies composed of a plurality of linearly formed coil bobbins are also connected by the core member, the coil for each coil bobbin is Since the wire can be continuously wound, the winding process can be greatly simplified, and the core material can also be used for transporting to the subsequent process, greatly reducing the cost of product manufacturing equipment. Productivity can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a coil bobbin manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing a coil bobbin assembly obtained in the same example.

FIG. 3 is a front view showing a state in which a coil bobbin is wound.

FIG. 4 is a front view showing a state in which continuous winding is performed on a coil bobbin assembly.

[Explanation of symbols]

4 Upper mold part 4a injection part 5 Lower mold part 6 guide blocks 7 Back tension unit 8 cavity 9 Runner section 10 core material 11 Coil bobbin connection 12 winding core 13 collar part

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromasa Ozaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Takeshi Yoshinaka 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Company (72) Inventor Toyonori Kintaka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-2-158207 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 41/12 H01F 17/00-21/12 H01F 27/00-27/42 H01F 30/00 H01F 38/42

Claims (2)

(57) [Claims] 1. A cavity having a hollow portion for molding a coil bobbin connecting body in which a plurality of coil bobbins each having a winding core portion around which a coil is wound and flange portions provided at both ends thereof are continuously formed in a straight line. Portion, a core material positioning portion for insert-molding a linear core material made of resin or glass in the central portion of the coil bobbin coupling body, a back tension portion for applying tension to the core material during the insert molding, An apparatus for manufacturing a coil bobbin, which comprises an injection unit for filling the cavity with molten material. 2. A cavity formed with a hollow portion for molding a coil bobbin connecting body in which a plurality of coil bobbins each having a winding core portion around which a coil is wound and flange portions provided at both ends thereof are linearly continuously formed. A core material made of resin or glass is placed in the center of the part, and the cavity material is filled with a composite material in which ferrite and resin mixed by heating and melting are filled through the injection part to form a coil bobbin connection body in which the core material is insert-molded. Claim 1 which manufactures
A method for manufacturing a coil bobbin using the described coil bobbin manufacturing apparatus.