JPS5832397Y2 - Voice coil insertion jig - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a voice coil insertion jig used during the manufacture of dynamic cone speakers.

In general, the structure of a cone speaker, as shown in FIG. an upper plate 5;
A voice coil 6 provided in the gap between the upper plate 5 and the center pole 2, a voice coil bobbin 7 that supports the voice coil 6, and a damper 8 and a cone 9 in the frame 1 that are bonded to the voice coil bobbin 7.
and a dust-proof cap 10.

Conventionally, a jig for supporting the voice coil bobbin 7 inserted into the center pole 2 at uniform intervals has an inner wall that is simply fitted into the outer peripheral wall of the center pole 2 and an outer wall that inserts and supports the voice coil bobbin 7. It is composed of a cylindrical body, which causes inconveniences such as the voice coil falling off when gluing, or the jig becoming stiff and unstable when removing the jig, making it impossible to fulfill the original purpose of the jig. There was a drawback.

The purpose of this invention was to eliminate these drawbacks, and to create a jig that would reliably fix the bobbin when attaching a cone or damper to the voice coil bobbin, and would allow removal of the jig extremely easily and reliably. It is provided by.

That is, as shown in FIGS. 2 and 3, the jig according to this invention consists of a jig main body 11 and an operating part 12, both of which are rotatable relative to each other and are formed in a manner to prevent removal by a washer 13. There is.

For example, the jig main body 11 is made of plastic material.
is a cylindrical outer circumferential surface 1 onto which the voice coil bobbin 7 is inserted;
1a, and a recess 11 inside thereof upward from the bottom surface.
b, and the inner circumferential wall 11C of the recess 11b.
has an inner diameter into which the outer periphery of the center pole 2 is tightly fitted, and is formed so that the upper part of the center pole 2 comes into contact with the ceiling of the recess 11b.

A protruding shaft 11d is provided at the center of the upper surface of such a cylindrical body, and three metal pins 11d are arranged around the protruding shaft 11d.
4. ... has been planted.

A groove 11e is carved in the outer peripheral edge of the upper end of the protruding shaft 11d, and serves as a groove for the washer 13.

The operation part is also molded from a plastic material, and the cylindrical part of the jig main body 11 has an outer peripheral part 1 having the same diameter as the outer peripheral surface 11a.
2a, and has a hole 12b in the center into which the protruding shaft 11d can be inserted and rotated freely.

Furthermore, the lower surface 12C has three biting grooves 15 along the outer circumferential surface in which the three pins 14 can be fitted and slightly slid.
. . . are bored at equal intervals, and a tongue piece 16 is formed between the groove 15 and the outer peripheral wall, and the tongue piece 16 is configured to bulge out from the outer wall depending on the position of the pin 14. There is.

In the jig of the present invention having such a structure, the voice coil bobbin 7 is fitted and inserted across the outer peripheral surface 11a of the cylindrical portion of the jig main body 11 and the outer peripheral surface 12a of the operating section 12, and the operating section 12 is rotated. As a result, the pin 14 pushes and spreads the tongue pieces 16 (see FIG. 2), so that the bobbin 7 is strongly held from the inside.

Next, insert it into the center pole 2 in this state, complete the necessary work such as gluing the damper and cone, and the operation part 1
2 to the opposite side, the bobbin 7 can be easily removed.

Therefore, the voice coil bobbin 7 is set on the outer periphery of the center pole 2 leaving a gap exactly equal to the thickness of the cylindrical part of the jig, and is strongly held by the jig so that the cone 9 or the damper 8 cannot be attached. Because it can be done accurately,
This has the effect of improving the speaker characteristics and significantly improving the workability of attaching the voice coil.

Furthermore, since the jig according to this invention has an extremely simple structure and is molded from plastic or the like, it can be manufactured at extremely low cost, thereby eliminating the increase in speaker manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a general cone speaker, FIG. 2 is a vertical cross-sectional view showing how the present invention is used, and FIG. 3 is an exploded perspective view of the present invention. 11...Jig main body, 12...Operation section,
13...Washer, 14...Pin, 1
5... Biting groove, 16... Tongue piece.

Claims (1)

[Scope of utility model registration request] The voice coil bobbin has an inner circumferential wall having the same diameter as the center pole into which a part of the voice coil bobbin is fitted at uniform intervals, a cylindrical part at the bottom having an outer circumferential wall having the same diameter as the inner circumferential wall of the voice coil bobbin, and a cylindrical part. A jig main body having a small diameter protruding shaft from the center position of the upper surface of the jig main body, and an outer peripheral surface having a hole into which the protruding shaft of the jig main body is inserted and having the same diameter as the cylindrical part of the jig main body. and an operating section having grooves inserted into the inside of the outer wall at a plurality of equally spaced positions on the outer peripheral surface thereof, and a protrusion provided on the upper surface of the cylindrical part of the main body of the jig fits into the groove of the operating section. 1. A voice coil insertion jig, characterized in that the outer walls of the biting grooves bulge outward depending on the rotational position of the voice coil insertion jig.