JPS6013041Y2 - head shell - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a head shell that is detachably attached to the end of a pickup arm, and its purpose is to facilitate automatic assembly of the head shell.

Generally, a head shell that is detachably attached to the end of a pickup arm is constructed as shown in FIG.

In FIG. 1, there is a relay connector at the rear end of the head shell body 1, which connects the output of the pickup cartridge 2 attached to the head shell body 1 to a signal transmission line (not shown) routed inside the pickup arm 3. A connector 4 for transmitting data is provided, and positioning pins 5 are implanted on the outer periphery of the connector 4.

This positioning pin 5 is inserted into the groove 6a of the sleeve 6 when the connector 4 is inserted into the sleeve 6 provided at the end of the pickup arm 3 to attach the head shell to the arm. This is for relative positioning in the rotational direction.

In the figure, 7 is a lock nut for firmly fixing the connector 4 to the arm 3.

Since such a head shell has a relatively simple structure, it seems easy to assemble it automatically.
Due to the small size of the components, there are various problems when attempting to actually carry out this process.

In particular, it is difficult to implant the positioning pins 5 on the outer periphery of the relay connector 4 because the pins 5 are extremely small, and this is currently done mostly by hand.

To explain this using FIG. 2, the tapered part 5a side of the positioning pin 5 shown in FIG. The flat head 5b of the pin 5 is struck using a hammer to press fit a predetermined length.

Incidentally, the diameter of the through hole 4a is 0.29 mm, the maximum outer diameter of the pin 5 is 0.98 mm, and the tapered surface 5a of the pin 5
The minimum outer diameter of is smaller than 0.92 mm.

As mentioned above, the positioning pin 5 needs to be manually inserted and temporarily tightened before being press-fitted into the through hole 4a of the connector 4, so the shape shown in FIG. 3 has been decided upon, and other shapes have not been considered. The current situation was that there was no such thing.

It is not impossible to automate the press-fitting of the positioning pin 5, but since the positioning pin 5 has a shape as shown in Fig. 3, if you try to automatically press-fit the pin 5, the pin 5 must be aligned with its taper. The pins 5 must be aligned so that the surface 5a is the bottom end, and this pin 5
It was extremely difficult to automate the process of arranging these items.

Therefore, the present inventors researched how to easily press-fit the positioning pin 5 automatically, and as a result, they arrived at the present invention as described below.

That is, in one embodiment of the present invention, as shown in FIG. 4, the positioning pin 5' is a cylindrical rod, and its upper and lower ends are chamfered 5a' into the same hemispherical shape.

When this positioning pin 5' is attached to an automatic press-fitting machine and press-fitted into the through-hole 4a of the relay connector 4, the hemispherical chamfered part 5a' of the pin 5' will spread the through-hole 4a, and the pin 5' will be inserted into the automatic press-fitting machine. It is press-fitted by a predetermined length determined by .

Since both the upper and lower ends of the pin 5' have the same shape, there is no need to be careful when installing the automatic press-fitting machine.

In addition, since both ends of the pin 5' are semispherical, it feels good to the touch, and there is no risk of injury to the user's fingertips from the tip of the pin 5' when the user removes the head shell.

Furthermore, the attachment of the head shell 5 to the arm 3 is performed smoothly.

The conventional type has a flat upper end as shown in Figure 3 (conventionally, a flat part was required at the upper end of the pin because it was driven in with a punch).
For this reason, it was sometimes the case that fingers were injured when removing the head shell, or that the attachment of the head shell to the arm did not work properly, but according to the present invention, these drawbacks are completely eliminated.

As explained above, according to the herad shell of the present invention, it becomes possible to easily press-fit the positioning pin of the head shell into the relay connector automatically, thereby streamlining the work and providing an inexpensive head shell. This eliminates the problem of fingers being injured by the tips of the positioning pins.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional herad shell, Fig. 2 is a diagram explaining the press-fitting of the positioning pin of the same head shell, Fig. 3 is a front view of the same positioning pin, and Fig. 4 is a herad shell of the present invention. It is a front view showing an example of the positioning pin in . 1...Head shell body, 3...Zeck up arm, 4...Relay connector, 5'...
...Positioning pin, 5a'...Semispherical chamfer.

Claims (1)

[Scope of utility model registration request] The head shell is removably attached to the end of the pickup arm, and is press-fitted to the outer periphery of the relay connector provided at the rear end of the head shell body.The position when the head shell is attached to the arm is A head shell in which the regulating pin is cylindrical and both ends are chamfered into the same hemispherical shape.