JP2567763Y2 - Electronic musical instrument keyboard device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic musical instrument, especially an electronic piano.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
There is known a keyboard device for an electronic musical instrument in which a key return means comprising a hammer d is rotatably supported on a key a about a fulcrum c.

The hammer d is for obtaining a key touch feeling similar to that of an acoustic piano, has a predetermined weight, and has a center of gravity at the right end of the drawing. When the key a is pressed, the hammer d rotates via the support member e, and the hammer d and the key a return to the initial position due to the weight of the hammer d. This conventional keyboard device can obtain a key touch feeling similar to that of an acoustic piano only when a key is pressed with a certain force or more, but when the key is pressed very weakly, the key stroke ends. The load increases at the end of the stroke of the key unlike an acoustic piano, and the load does not suddenly decrease (let-off).

Therefore, as shown in FIG. 2, a jack g is provided on a key a pivotally supported on a keyboard frame f so as to be rotatable about a shaft j, and an elastic member h for returning the rotation of the jack g to an initial position is provided. When the key a is pressed and swings, the jack g rotates to break the link with the swingable hammer d, and the key a touches the key a like an acoustic piano irrespective of the strength of the key pressing. (Japanese Patent Application Laid-Open No. 63-155095) has been proposed. In this case, the key a
Is provided with a return spring l, and returns with its elasticity.

[0005]

The prior art hammer d is supported only by a fulcrum m, and does not have means for preventing a lateral run-out that occurs when the hammer swings. Although it was thought that the horizontal swing of the hammer d could be limited at the fulcrum m, it was not sufficient as a means for preventing the horizontal swing of the hammer d which vibrates vigorously. There was a problem that operation could not be obtained.

An object of the present invention is to prevent a hammer of a keyboard device of an electronic musical instrument from swinging sideways.

[0007]

According to the present invention, in order to achieve the above object, a jack which is supported by a fulcrum of a keyboard frame of an electronic musical instrument and which is rotated by being pushed by a swinging key, and a turn of the jack are provided. In a keyboard device provided with an elastic member for restoring movement and rocking of a key, and a hammer that abuts on the jack and gives resistance to rocking of the key, the arm of the hammer enters the jack. A hollow portion for guiding the swing direction is provided. In this case, the jack is rotatably attached to the key, and a hollow portion having an open lower end extending in the swinging direction of the hammer is formed in an extension of the jack, and a part of the arm of the hammer is formed therein. It can be configured to intervene freely.

[0008]

When the key is depressed, the jack is pushed down by the key and the jack is moved down. The tip of the jack contacts the hammer to swing it. When the downward movement of the jack further proceeds, the jack contacts the fixing member provided at an appropriate position, and the jack rotates, whereby the link between the key and the hammer is disconnected. The key then reaches the lower limit at which it touches the keyboard frame. As a result, the player alternately receives resistance, non-resistance, and resistance during key depression, and can obtain a key touch of an acoustic piano.

The hammer swings about a fulcrum, but the arm of the hammer is guided by a hollow portion formed in the jack and swings. Key depression operation can be performed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
In FIG. 3, reference numeral 1 denotes a key (white key) rotatably supported by a fulcrum 2a on a keyboard frame 2 at a base end thereof.
Is formed in a substantially box shape and has a lower surface open, and a stopper portion 3 for determining a swing upper limit of the key 1 is formed on at least one of both side walls of the key 1 so as to protrude downward. A switch 4 and a fulcrum member 5 are fixed to the keyboard frame 2,
A hammer 8 having a weight 7 is rotatably supported on a fulcrum 6 of the fulcrum member 5. In the internal space of the key 1, a jack 9 having a substantially T-shaped side surface is turned into a notch 1a provided at the lower end of the key 1 by a support shaft 9a extending left and right integrally with the jack 9 as shown in FIG. It is pivotally supported. When the key 1 swings downward, the jack 9 rotates clockwise with the corner 9 c of the jack 9 abutting on the keyboard frame 2. The rotation of the jack 9 and the key 1 are performed between the concave portion 9b formed in the middle of the jack 9 and the concave portion 5a formed in the fulcrum member 5 while the elastic member 10 composed of a strip-shaped leaf spring is kept elastic. It was stretched so that it would not fall off due to the rocking motion. Reference numeral 11 denotes a switch board for mounting the switch 4 fixed to the keyboard frame 2, and 12 denotes an actuator for operating the switch 4 fixed to the key 1. As shown in FIG. 4, a hollow portion 9e is formed at the tip end of an extension 9d extending from the jack 9 toward the hammer 8 so that the lower end extending in the swing direction of the hammer 8, in this case, the vertical direction is open. A vertical reinforcing rib 8a formed on the arm of the hammer 8 is swingably interposed in the hollow portion 9e. One end of the hammer 8 is provided with a hammer contact portion 8b which contacts the stopper portion 3 of the key 1 and transmits the return force of the hammer 8 to the key. Return to the initial position with the return force.

To explain the operation of this embodiment, when the key 1 is pushed down and swings downward, the jack 9 provided on the key 1 also moves downward. With the movement of the jack 9, the extension 9 d becomes the jack contact portion 15 of the hammer 8.
And the hammer 8 starts to rotate counterclockwise.
At this time, the player receives the load of the elastic member 10 and the hammer 8. When the key 1 is further depressed, the corner 9c of the jack 9 is pressed.
Abuts on the fixed keyboard frame 2, and the jack 9 starts rotating about the support shaft 9a. At this time, the player receives the drag from the keyboard frame 2 and the load of the elastic member 10. When the key 1 is further depressed, the jack 9 rotates so that the extension 9 d of the jack 9 comes off the hammer 8. At this moment, the resistance of the key 1 decreases and the mass of the hammer 8 decreases.
The player feels momentarily weak. After that, the key 1 is
, And the downward movement of the key 1 ends. Since the reinforcing rib 8a of the hammer 8 swings with its both sides restricted within the hollow portion 9e of the jack 9, the hammer 8 does not swing and the key 1 does not give an unstable key-pressing operation. Further, since the hammer 8 and the jack 9 have a complicated structure, the dimension in the vertical direction is shortened, and the keyboard device is compact.

When the hammer 8 is a hammer that rotates about the fulcrum 6 as shown in the figure, the hammer 8 contacts the upper limit stopper felt 17 due to inertia caused by depressing the key 1, and then returns clockwise by its own weight. When the player starts moving, the force is transmitted to the key 1 via the stopper portion 3, and the player receives a touch feeling after striking a string on a normal acoustic piano. At this time, the extension 9d of the jack 9 is
Does not return to the position where it comes into contact with the jack contact portion 15 of the.

At the time of key release, the key 1 receives the resultant force of the return swinging power of the hammer 8 and the load of the elastic member 10, and the key 1 returns to the initial position in contact with the stopper felt 14, and the hammer 8
Also, the jack 9 is rotated to the initial position by the elastic force of the elastic member 10 so that the extended portion 9 d faces the jack contact portion 15 of the hammer 8.

[0014]

As described above, according to the present invention, there is provided a keyboard apparatus having a hammer which abuts against a jack which is rotated by being pressed by a key of an electronic musical instrument and which gives resistance to the swing of the key. Since the jack is provided with a hollow portion for guiding the swinging direction of the hammer, the hammer swings without lateral swing,
The key operates stably because the key touching the hammer does not transmit the key, and the key operates stably. Since no separate member is required to prevent key deflection, the key can be manufactured at a low cost. There are effects such as being able to do.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of a conventional example.

FIG. 2 is a side view of another conventional example.

FIG. 3 is a cutaway side view of the embodiment of the present invention.

FIG. 4 is an enlarged sectional view of an AA part in FIG. 3;

[Explanation of symbols]

1 key 2 keyboard frame 2a
Fulcrum 5 fulcrum member 6 fulcrum 8
Hammer 9 Jack 9d Extension 9e
Hollow part 10 Elastic member

Claims (2)

(57) [Scope of request for utility model registration] 1. A jack supported by a fulcrum of a keyboard frame of an electronic musical instrument and rotated by being pushed by a swinging key, an elastic member for restoring the rotation of the jack and swinging of the key, and In a keyboard device provided with a hammer that abuts against the rocking motion of the key, a hollow portion is provided in which the arm of the hammer enters the jack and guides the rocking direction. Electronic musical instrument keyboard device. 2. The jack is rotatably attached to the key, and a hollow portion is formed in an extension of the jack, the lower end of which extends in the swinging direction of the hammer, and is formed therein. The keyboard device for an electronic musical instrument according to claim 1, wherein a part of the keyboard device is swingably interposed.