JPH0322785Y2 - - 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 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.
on the other hand, two protrusions 8 having a notch 9 with a width corresponding to the thickness of the chassis 4 at the rear end of the key 1.
are provided and 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), pass the protrusion 8 of the key 1 into the square hole 10 bored in the chassis 4, and remove the protrusion 8.
After inserting the notch 9 provided at the upper end of the chassis 4 up to the L-shaped bent part, by removing the force applied to the key 1, the spring 3 is released as shown in Fig. 3c.
The key 1 is pushed upward, 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, with such a structure, it is necessary to deform the spring 3 by a considerable amount by moving the key 1 back and forth, as shown in FIG. Position of,
It is difficult to determine the shape, etc., and it is difficult to insert the key 1, so the assembly cannot be mechanized and must be done manually, resulting in low productivity.

Purpose of the Invention The present invention solves these conventional drawbacks, and provides a keyboard device for an electronic musical instrument that allows the key to be easily locked to the chassis.

Structure of the invention The present invention provides a plurality of bent pieces at the rear end of the chassis, and integrally forms rectangular locking pieces wider than the width of the bent pieces near the tips of the bent pieces, respectively.
On the other hand, two parallel protrusions are provided at the rear ends of the plurality of keys corresponding to the locking pieces, which are slightly narrower than the width of the locking pieces and spaced slightly wider than the bent pieces. The protrusion is slightly pushed apart and the locking pieces are fitted into holes provided in the protrusion to lock the protrusion.
In this way, the key can be locked to the chassis without applying excessive force to the spring.

DESCRIPTION OF EMBODIMENTS FIG. 4 shows a main part of an embodiment of the present invention. Fourth
In the figure, 11 is a chassis, and the main plane 11
Bend the rear end of a at a nearly right angle to form multiple bent pieces 1
1b, and a bent piece 11b at the tip thereof.
A rectangular locking piece 11c wider than the width of the locking piece 11c is integrally formed. On the other hand, 12 is a key integrally molded from resin, and the rear end has two parallel protrusions 12a, 1
2a, and holes 12b, 12b are formed in the center of each protrusion 12a, 12a. Note that the distance between the two protrusions 12a, 12a is as follows:
It is slightly narrower than the width of the locking piece 11c, and the bent part 1
It is set to be slightly wider than 1b.

In the above configuration, the key 12 is assembled into the chassis 11 as shown in FIG. First, Figure 5 a, b
By pushing down the key 12 in the direction of arrow c from directly above the chassis 11 against the elasticity of the spring 3, the protrusions 12a, 1 of the key 12 are released as shown in FIG. 5c.
2a spreads to the left and right by the locking piece 11c, and when pressed down further, the key 12 eventually opens as shown in Fig. 5 d and e.
The chassis 1 is inserted into the hole 12b drilled in the protrusion 12a of the
At the same time that the rectangular locking piece 11c of 1 is fitted, the protrusions 12a, 12a of the key 12 are restored to the narrowing direction and are locked to the key 12 and chassis 11, and the locking portion is used as a fulcrum and is held together by the spring 3. Assembling is completed by being rotatably supported in the direction.

Effects of the invention As described above, according to the invention, the assembly of the key into the chassis is completed by simply pushing the key down from above, which simplifies the work, facilitates mechanization such as automatic assembly, and improves productivity. In addition, the movement of the spring during the assembly process is simply compressed, and no unreasonable force is applied, resulting in a longer life and easier design. The key can be supported and fixed.

[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 side view for explaining the assembly work, 4th
The figure is an exploded perspective view showing the main parts of an embodiment of the present invention.
Figures 5a to 5e are diagrams for explaining the assembly work. 11... Chassis, 11a... Main plane, 11b
...Bending piece, 11c...Locking piece, 12...Key, 1
2a... protrusion, 12b... hole.

Claims (1)

[Claims for Utility Model Registration] The rear end of the main plane has a plurality of bent pieces bent in a direction perpendicular to the main plane, and the tip of each bent piece has a width larger than the width of the bent piece. a chassis on which a wide rectangular locking piece is integrally formed; and two protrusions provided in parallel at the rear end with an interval slightly narrower than the width of the locking piece and slightly wider than the width of the bent piece. a plurality of resin keys corresponding to the locking pieces, each having a hole in the center of each protruding portion; and a plurality of springs always pushing the key upward; rectangular locking pieces provided on the bent pieces of the chassis are respectively locked in holes provided in the two protruding parts of the key; A keyboard device for an electronic musical instrument, characterized in that the key is supported and fixed by a spring and the locking piece, and the elastic force of the spring biases the key to rotate in one direction using the hole as a fulcrum. .