JPH0322786Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a keyboard device for an electronic musical instrument, and in particular provides a structure that facilitates assembly when locking the rear end of each key to the chassis. be.

Structure of a conventional example and its problems FIG. 1 shows a conventional example of a keyboard device for an electronic musical instrument.
The white key or black key 1 (hereinafter simply referred to as key 1) is
The rear end portion is locked to the chassis 4, and is always urged upwardly by a spring 3 using this as a fulcrum so as to be freely rotatable, and its rotation is restricted by a stopper 2 provided on the underside of the key 1. An actuator 5 is integrally formed on the lower surface of the key 1, and is configured to turn on a switch circuit 6 fixed to the lower part of the chassis 4 by pressing the key 1 down.

In such a configuration, the fulcrum portion that rotatably supports the key 1 on the chassis 4 is configured as shown in FIG. 2. That is, the rear end of the chassis 4 is bent into an L shape, and the same number of square holes 10 as the number of keys 1 are inserted here.
A protrusion 8 having a notch 9 of a width corresponding to the thickness of the chassis 4 is provided at the rear end of the key 1, and these are assembled in the order shown in FIG. That is, as shown in FIG. 3a, the key is pushed down in the direction of arrow A while installing the spring 3 between the spring seat 4a provided on the chassis 4 and the lower surface of the key 1, and then as shown in FIG. 3b. Push the key 1 backward (in the direction of arrow B) until the square hole 10 drilled in the chassis 4 is inserted.
Pass the protruding part 8 of the key 1 through the hole, insert the notch 9 provided at the upper end of the protruding part 8 to the L-shaped bent part of the chassis 4, and then remove the force applied to the key 1. As shown in FIG. 3c, the key 1 is pushed upward by the spring 3, and the notch 9 of the key 1 is rotatably supported at the upper end of the square hole 10 of the chassis 4.

However, for such a structure, Fig. 3a
As shown in Fig. 3, the key 1 must be pushed down to a predetermined height in the direction of arrow A, and then pushed in the direction of arrow B shown in Fig. 3b. It was difficult to insert the paper properly, and the work took a lot of time.

Purpose of the Invention The present invention solves these conventional drawbacks, and provides a keyboard device for an electronic musical instrument that facilitates the work of locking keys to the chassis.

Structure of the invention In the present invention, a protruding piece is formed downward near the locking part at the rear end of the key, and when this protruding piece is brought into contact with the main plane of the chassis, the locking part at the rear end of the key is The height is such that it passes through a square hole drilled in a bent piece bent in an L shape with respect to the main plane of the chassis.By doing this, you can adjust the height by relying on your intuition. There is no need to do this, and the key can be smoothly locked in the chassis.

DESCRIPTION OF EMBODIMENTS FIG. 4 shows a main part of an embodiment of the present invention. key 1
A protruding piece 11 that protrudes downward is integrally formed near the rear end locking part of the chassis 4, and the height is such that the tip of the protruding piece 11 is aligned with the main plane of the chassis 4, as shown in FIG. 4a. 4c, the height is such that the protrusion 8 at the rear end of the key passes through a square hole 10 formed in the bent piece 4b bent in an L shape with respect to the main plane 4c of the chassis 4. Therefore, the chassis 4 of the key 12
As shown in FIG. 4a, the spring 3 is installed between the spring seat 4a provided on the chassis 4 and the lower surface of the key 12, and the protruding piece 11 is inserted into the chassis 4 in the direction of arrow A. After pressing down until it contacts the main plane 4a of the key 12, push it in the direction of arrow B as shown in FIG. After inserting the notch 9 provided at the upper end of the part 8 up to the L-shaped bent part of the chassis 4, when the force applied to the key 12 is removed, the key 12 is held by the spring 3 as shown in Fig. 4c. The key 12 is pushed upward, and the notch 9 of the key 12 is rotatably supported at the upper end of the square hole 10 of the chassis 4, thereby completing the installation.

Effects of the invention As described above, according to the invention, by providing a stopper for pressing the key from above, there is no need to rely on intuition to adjust the height, and even non-experts can easily hold the key. It has the advantage of being easy to assemble, and because the work is simple, it is easier to mechanize automatic assembly and improve productivity.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional keyboard device for an electronic musical instrument.
Figure 2 is an exploded perspective view of the main parts, Figure 3 a, b,
c is a partial side view for explaining the assembly work;
4a, b, and c are partial side views for explaining the assembly work of an embodiment of the present invention. 4... Chassis, 4a... Main plane, 4b... Bent piece, 10... Square hole, 11... Protruding piece, 12...
key.

Claims (1)

[Scope of utility model registration request] A chassis having a main plane, a bent piece bent in a direction perpendicular to the main plane and having a square hole bored at the rear end of the main plane, and an upper part having a substantially U-shaped cross section with an opening at the bottom. a key having a notch at the rear end that engages with the upper end of the square hole of the chassis,
A protruding piece of such length that the upper end of the key is approximately at the same height as the upper end of the square hole when the lower end of the key is brought into contact with the main plane of the chassis. An integrated electronic musical instrument keyboard device.