JPH0449675Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a key device for an electronic musical instrument having a key touch with a feeling of mass.

(Prior art) Conventionally, the third type of key device for this type of electronic musical instrument has been used.
As shown in the figure, a lever c having a weight b at the tip is pivotally supported behind a key a, and an actuator d on the lower surface of the lever c is actuated on the rear end of the key a,
As shown in FIG. 4, the rear end of the key a is a fulcrum e, and an actuator d is provided at the front end of the fulcrum e.
It is known that the lever f comes into contact with the upper part of the shaft support side of a swingably supported lever f having a large moment of inertia, and is rotated when a key is pressed.

In addition, as shown in FIG. 5, in order to reduce the movement of the tip side of the lever f shown in FIG. It is known that an actuator d provided on the rear end side of the front part of the key is brought into contact with the actuator d and rotated when a key is pressed.

(Problem to be solved by the invention) In the case shown in Fig. 3 above, in order to obtain a key touch with a sense of mass, the rear part of the fulcrum of key a must be lengthened, so the key device becomes large. There was an issue of high costs. Furthermore, in the case shown in Fig. 4, the moment of inertia of the lever f acts effectively on the key touch, but there is a problem in that the amount of rotation of the lever f when the key is pressed is large and a large space is required under the key a. .

In addition, in the case shown in FIG. 5, although the space below the key a is small, the actuator d provided on the key a is provided on the front fulcrum side of the fulcrum e of the key a.
There was a problem in that the moment of inertia of the lever f did not effectively affect the key touch.

The present invention aims to solve the above-mentioned problems of the conventional ones.

(Means for Solving the Problems) In order to achieve the above object, the key device for an electronic musical instrument of the present invention provides a key device in which a key is swingable with its rear end as a fulcrum. a first lever that is rotatable when pushed by the key; and a second lever that has a large moment of inertia that is rotatably supported behind the key; The key device is characterized in that the key is connected to the lever by a link mechanism, and in which the key is swingable using the rear end as a fulcrum. The first lever has a second lever with a large moment of inertia that can be rotated by being pushed by the first lever, and the first lever has a length between its pivot point and the tip on the key side. It is characterized in that the lever ratio is formed to be longer than the length between the shaft fulcrum and the tip on the second lever side.

(Function) In the key device for an electronic musical instrument according to claim 1, when the key is pressed, the first lever rotates, and this rotation is caused by the second lever pivotally supported behind the fulcrum of the key via a link mechanism. , and the second lever rotates.
Since the second lever has a large moment of inertia, a key touch with a sense of mass can be obtained. Since the second lever is located behind the fulcrum of the key, the space below the key is smaller compared to the conventional lever that pivots below the key, and the space in the longitudinal direction behind the fulcrum of the key is It is smaller than the conventional one, which rotates the lever behind the key.

In the electronic musical instrument key device according to claim 2, when the key is pressed, the first lever rotates, and the second lever is pushed by the rotation of the first lever and rotates.
The first lever is formed with a lever ratio in which the length between the pivot point and the tip on the key side is longer than the length between the pivot point and the tip on the second lever side. The amount of rotation of the lever is small.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a key, and the key 1 is locked at its rear end to a support shaft 3 provided on a chassis 2, so that it can swing freely, and between the rear end and the chassis 2. A spring 4 for returning the key is tensioned. The key 1
On the lower surface of the front end side of the front part of the support shaft 3, there is a chassis 2.
One end of a rotatable first lever 6 which is pivotally supported by a support shaft 5 provided in the first lever 6 abuts, and the other end of the lever 6 is connected to one end of a link mechanism 7 . The link mechanism 7 is arranged parallel to the lower part of the chassis 2, and its other end is connected to one end of a second lever 8 having a large moment of inertia. The second lever 8 is connected to a support shaft 9 of the chassis 2 located immediately behind the support shaft 3 of the key 1.
It is rotatably supported by a shaft, and its rotation is stopped by a lever stopper 10 having an L-shaped cross section.

In the above-mentioned key device, the moment of inertia of the second lever 8 effectively acts on the tip 1 of the key 1 via the link mechanism 7, so that a key touch with a sense of mass is obtained, and the second lever 8 Since it can be placed immediately behind the fulcrum 3 of the key 1, it can be made smaller.

What is shown in the second figure is another key device of the present invention.

Similarly to the key shown in the first figure, the key 1 is also stopped at its rear end by a support shaft 3 so as to be able to swing freely.
A bell crank-shaped first lever 6 is also pivotally supported by the support shaft 5 at the same position as that shown in the first figure.

The first lever 6 is formed with a lever ratio such that the length between the pivot point and the tip on the key side is longer than the length between the pivot point and the tip on the second lever 8 side, and when the key is pressed, the length between the pivot point and the tip on the key side is longer. The amount of rotation of the point of action A with the lever 6 of the first lever is the first
The amount of rotation of the point of action B of the lever 6 and the second lever 8 is larger than that of the lever 6 and the second lever 8. Since the point of action B is formed at approximately the same position as the point of action A of the actuator d and lever f in the conventional example shown in the fourth figure, the moment of inertia of the second lever 8 is approximately the same as that shown in the fourth figure. Similarly, it effectively acts on the key touch to obtain a key touch with a sense of mass, and the first lever 6
Since the amount of action at point B of action is equivalent to the amount of action at actuator d shown in FIG. 5, and the amount of rotation of second lever 8 can be reduced, the space below key 1 can be reduced.

(Effects of the invention) Since the invention is configured as described above,
It has the effect of providing a key touch with a sense of mass and being able to be made smaller.

[Brief explanation of the drawing]

1 and 2 are side views of a key device for an electronic musical instrument according to the present invention, and FIGS. 3, 4, and 5 are side views of a conventional example. 1... Key, 6... First lever, 7... Link mechanism, 8... Second lever.

Claims (1)

[Claims for Utility Model Registration] 1. A key device in which a key is swingable using its rear end as a fulcrum, a first lever that is pivotable by being pushed by the front of the fulcrum of the key, and a rear end of the key. 1. A key device for an electronic musical instrument, comprising: a second lever having a large moment of inertia that is rotatably supported on a shaft; the first lever and the second lever are connected by a link mechanism. 2. In a key device in which the key is swingable with its rear end as a fulcrum, there is a first lever that can be freely rotated by being pushed by the front part of the fulcrum of the key, and a lever that can be freely rotated by being pushed by the first lever. and a second lever with a large moment of inertia, and the first lever has a lever ratio in which the length between the pivot point and the tip on the key side is longer than the length between the pivot point and the tip on the second lever side. A key device for an electronic musical instrument, characterized in that it is formed as follows.