JPS62168499A - Integral formation of edge in cone speaker - Google Patents

Abstract

PURPOSE:To improve productivity without using an adhesive by decreasing a mold pressing pressure applied on the peripheral part of a cone set in a mold, injecting unvulcanized rubber to form a thin film on the peripheral part of the cone to form the edge. CONSTITUTION:An upper mold 9, in its part where the cone 11 is loaded, is so constituted that a cone peripheral part abutting part 9a is recessed slightly from other cone peripheral part abutting part 9b via a step part 9c. The cone 11 is sandwiched by the upper mold 9 and a lower mold 8. When the unvulcanized rubber is injected, the part 9a is subjected to a mold pressing pressure lower than that applied on the part 9b. The said rubber constituting the edge intrudes the clearance at the part 9a is stuck integrally to periphery of the edge as a film 21. Thereafter, the edge 20 which is connected integrally with the periphery of the cone is formed. In such a way, a strong adhesion is generated without a necessity for an adhesive, and the productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for integrally forming edges in a cone speaker.

(Prior Art) A flexible edge portion made of rubber or the like is usually provided on the outer periphery of a cone speaker as a connection portion between the mounting portion and the cone portion. Conventionally, this edge portion was constructed from a rubber molded product or a press punched product from a polyurethane sheet, which was bonded to the peripheral edge of the cone with an adhesive. However, not only is it inefficient to go through such multiple steps, but also when joining the edges to the cone, it is necessary to attach each edge to the mold one by one and proceed with the adhesion work.

It was extremely complicated. Furthermore, when obtaining a rubber molded product, complicated finishing work such as deburring is required, resulting in poor work efficiency.On the other hand, when punching a sheet, there is a problem of discarding the surplus portion, which causes economic inconvenience.

(Problems to be Solved by the Invention) This invention proposes integrally molding the edge portion in order to solve these drawbacks all at once.
In particular, we aim to propose an integral molding method that can effectively and beautifully join the periphery of the cone to the knees and knees.

(Means for Solving the Problems) That is, the present invention provides a method for reducing mold clamping pressure applied to the periphery of the cone when inserting a cone into a mold and integrally forming a rubber edge on the periphery of the cone. The present invention relates to a method for integrally forming an edge in a cone speaker, characterized in that unvulcanized rubber is press-fitted with a low pressure, and the edge is integrally molded while forming a thin film on the peripheral edge of the cone.

(Example) The present invention will be described in detail below with reference to the attached drawings.
Fig. 1 is a perspective view showing an example of a cone speaker, Fig. 2 is an exploded perspective view of the cone speaker, Fig. 3 is a central vertical cross-sectional view, Fig. 4 is a cross-sectional view of the main part during molding, Fig. 5a, and Fifth
Figure b shows an enlarged view of section A in Figure 4.

As shown in the figure, the cone speaker 10 is formed by integrally forming an edge 20 made of rubber on the outer periphery of a cone 11 in the shape of a bowl.

Usually, the outer periphery of the edge 20 is further formed with a mounting flange 15a serving as a mounting portion to the speaker box or a reinforcing frame 15b for mounting.

These cones 11, mounting collar 15a, and mounting reinforcement frame 1
5b is generally made of paper.

FIG. 3 is a central vertical sectional view of a cone speaker, with different examples shown on the left and right sides of the figure. First, the left side is an example in which only the edge 20 is integrally joined to the periphery of the cone 11, and the right side of the figure is an example in which a mounting collar 15 is further added to the outer periphery of the edge 20.
This is an example in which the reinforcing frame 15a or the mounting reinforcing frame 15b are integrally joined.

The feature of this invention is that when the edge 20 made of rubber is integrally formed around the periphery of the cone 11, as can be understood from FIG.
The mold clamping pressure applied to the peripheral edge of the cone 11 is lower than that of other parts, and unvulcanized rubber is press-fitted and molded, and the edge 20 is integrally provided while forming a thin rubber coating 21 on the peripheral edge of the cone 711. There is a particular thing.

That is, FIG. 4 and subsequent figures relate to cross-sectional views of transfer molding molds for integral molding, and as shown in FIG. The cone contacting portion 9b is configured to have a slightly concave surface through the stepped portion 9C. With this configuration, the cone 1 is placed between the lower mold 8 and the upper mold 9.
1 and press-fits the unvulcanized rubber R, the clamping pressure of the cone peripheral edge contact portion 9a of the upper mold 9 is lower than that of the other cone contact portions 9b. The sulfur rubber R flows around into the gap between the corresponding contact portions 9a and is integrally attached to the edge periphery as a coating 21. If this is vulcanized and molded, an edge that is integrally joined to the periphery of the cone can be obtained extremely easily and completely.

(Operation/Effect) This invention utilizes the fluidity of unvulcanized rubber and controls it by controlling the mold clamping pressure.

This is intended to form an extremely effective joint.

Naturally, the cone speaker obtained in this way has a major economic and production efficiency advantage, unlike the conventional speaker described above, in that it does not require any adhesive or bonding process. . Roughly speaking, the joint obtained by this invention forms a covering rubber layer by the difference in mold clamping pressure as described above, so the joint can be made extremely thin, and the joint is also more efficient than using adhesives. Since it is much stronger and more complete, it does not reduce the acoustic effect of the cone in any way and also increases its durability. Furthermore, for exactly the same reason, the practical effects of this invention are extremely large, such as the fact that the mounting collar or the mounting reinforcing frame can be integrally formed on the outer periphery of the edge very simply and easily. .

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a cone speaker, Fig. 2 is an exploded perspective view of the cone speaker, Fig. 3 is a central vertical cross-sectional view, Fig. 4 is a cross-sectional view of the main part during molding, Fig. 5a, and Fifth
Figure b shows an enlarged view of section A in Figure 4. 8.9... Molding mold, 9a... Cone periphery contact part,
9b...Cone joint part, 9C...Step part, 10...
Cone speaker, 11... Cone, 15a... Mounting flange, 15b... Mounting reinforcement frame, 20... Edge,
21...Coating.

Claims (1)

[Claims] 1. When inserting a cone into a mold and integrally forming a rubber edge on the periphery of the cone, the mold clamping pressure applied to the periphery of the cone is lowered to produce unvulcanized rubber. 1. A method for integrally forming an edge in a cone speaker, comprising press-fitting the cone and forming a thin film on the peripheral edge of the cone while integrally molding the edge. 2. An edge in a cone speaker according to claim 1, in which the mold clamping pressure applied to the cone periphery is reduced by configuring the cone periphery contact portion in the mold to be more concave than other cone contact portions. integral formation method.