JPH04303891A - Keyboard device for electronic piano - Google Patents

Abstract

PURPOSE:To obtain the keyboard device of an electronic piano with characteristic similar to that of an acoustic piano capable of hitting repeatedly the same key at high speed continuously like a trill. CONSTITUTION:A jack 7 and a repetition lever 8 are pivotally supported on a key 1 in such a way that they can be turned, and the jack 7 and the repetition lever 8 are turned by hitting the key, and accordingly, a hammer 10 supported with a key frame 2 is turned. The jack 7 comes off the jack abutting part 11 of the hammer 10 after operating a first switch 16 by abutting, and after that, the hammer 10 is further turned by inertia, and is turned in a reverse direction after operating a second switch 17, and is brought into contact with a catcher 26 provided at the key 1 being depressed, which suppresses the vibration of the hammer 10. When a finger is separated from the key, the return of the hammer 10 to an initial position can be blocked by the repetition lever 8 turning in a counterclockwise direction by the elastic force of a flat spring 9, and the jack 7 is quickly returned to the jack abutting part 11.

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 piano.

0002

2. Description of the Related Art As shown in FIG. 8, a conventional electronic piano has a jack b rotatably locked to a key a, and a hammer c.
is rotatably locked, and the hammer c is configured to be rotated by the force transmitted from the jack b, which is rotated by the force transmitted from the key a, and when the jack b is released, the spring d to return to the initial position.

0003

[Problems to be Solved by the Invention] According to the configuration of the conventional electronic piano described above, after the jack b comes off from the hammer c during the process of pushing in the key a, the hammer c rotates due to inertia. The touch feels like a hammer hitting a string.

However, since the return of jack b to its initial position does not quickly follow the return of key a, it is difficult to hit the same key continuously at high speed, like a trill that can be performed on an acoustic grand piano. Also, when making a weak hit, jack b rapidly rotates from the predetermined position and there is no resistance to the fingers due to pushing down on hammer c, so there is no let-off feeling when jack b comes off hammer c. The problem was that it was extremely small compared to a grand piano.

[0005] An object of the present invention is to solve these conventional problems.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the invention according to claim 1 provides a jack that rotates by a force transmitted from a key, and a jack that rotates by a force transmitted from the rotating jack. In a keyboard device for an electronic piano equipped with a movable hammer, a jack and a repetition lever are rotatably provided in the hollow part of the key, one end and the other end of an elastic member are respectively locked to the jack and the repetition lever, and the elastic member This allows the jack and repetition lever to return to their initial positions. The invention according to claim 2 provides the keyboard device according to claim 1, wherein when a key is pressed, the hammer rotates by a force transmitted from the rotating jack,
After that, we added a structure in which a catcher is formed integrally with the key to contact the hammer and suppress vibration of the hammer before returning to the initial position.

[0007]

[Operation] When the key is pressed, the jack and repetition lever move down as the key rotates, pushing down the hammer. First, the repetition lever rotates and separates from the hammer.
Next, when the jack has moved a predetermined distance, the jack contacts the keyboard chassis and rotates. At this time, a great sense of resistance is created in the player's fingers. After that, when the jack is rotated further, the jack is removed from the hammer, the force to press down on the key decreases rapidly, and the resistance to the fingers decreases. This peak of resistance (let-off feeling) is essential for expressing the delicate touch when hitting lightly, and it gives the performer a pleasant sense of the end of the keystroke when the key stops. Even after the hammer is removed from the jack, it continues to rotate due to inertia, and after it stops, it rotates in the opposite direction due to gravity, and comes into contact with the catcher of the key being pressed, suppressing vibration. When the key is released, even if the key does not return to the top, the elastic force of the elastic body, one end of which is locked to the repetition lever, returns the jack to the specified position, thus making it possible to press the next key. Can hit repeatedly at high speed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described with reference to the accompanying drawings. 1 and 2 show an embodiment of the present invention and its essential parts in a key-released state.

In the figure, a key 1 is swingably locked to a keyboard frame 2 at its rear end, and returned to the illustrated position by a spring 3. Bearings 5 and 6 consisting of grooves are formed at two locations on the lower edges of both side walls 4 and 4 of the key 1, which has a U-shaped cross section and is open at the bottom. The repetition levers 8 are each rotatably locked. Jack 7 and repetition lever 8
is a jaw-shaped jack contact portion of a hammer 10, in which one end and the other end of a leaf spring 9 are respectively locked in the recesses, and each end is swingably supported on the keyboard frame 2 by the elastic force of the leaf spring 9. 11, and the other end of each comes into contact with the upper inner wall surface of the key 1 to return to the initial position and not to fall off from the key 1.

The hammer 10 is intended to give a key touch feeling similar to that of an acoustic piano, and has a weight at one end.
2, a recess 15 is fitted into a fulcrum part 14 of a hammer fulcrum member 13 fixed to the keyboard frame 2, and is rotatably supported, and in a free state is tilted downward to the right by a weight 12. The keyboard frame 2 includes a first switch 16 that is activated by the contact of the jack 7 when a key is pressed, a second switch 17 that is activated by the rotated hammer 10, and an actuator provided on the upper inner wall surface of the key 1 when the key is pressed. A third switch 19 actuated by 18 is provided.

As clearly shown in FIGS. 3 and 4, the hammer fulcrum member 13 has a hammer guide portion 20 and a keyboard frame reinforcing portion 21 in addition to the fulcrum portion 14, and is fixed to the keyboard frame 2 with screws 22. Ru. The fulcrum portion 14 has a grease reservoir groove 23 on its arcuate surface at the mounting position of the hammer 10, and a protrusion 24 formed in the recess 15 of the hammer 10 fits into this groove 23. The hammer guide portion 20 fits into a recessed portion of the hammer 10 to guide the hammer 10, and the tip of the keyboard frame reinforcing portion 21 comes into contact with a shelf board (not shown) or the like when the keyboard frame 2 is pressed. This is to prevent bending such as.

In this embodiment, as clearly shown in FIG. 2, upper limit stoppers 25, 25 extending downward from both side walls 4, 4 of the key 1 have a function similar to that of a catcher on an acoustic piano. A catcher portion 26 is formed, and the catcher portion 26 comes into contact with the front end surface of the hammer 10 when a key is pressed, thereby suppressing vibration of the hammer 10.

Next, the operation of this embodiment will be explained with reference to FIGS. 5 to 7 showing each process during key depression. When the key 1 shown in FIG. 1 is pressed down, the key 1 rotates the hammer 10 via the jack 7 and the repetition lever 8, as shown in FIG. The jack 7 comes into contact with a member 27 and rotates to separate from the hammer 10. Next, the jack 7 contacts a first switch 16 provided on the keyboard frame 2, actuates it, and rotates to push down the hammer 10. The frictional force between the hammer 10 and the jack 7 gives a great sense of resistance to the player's fingers. Thereafter, the jack 7 rotates further and comes off the jack contact portion 11 of the hammer 10, as shown in FIG. 6, and the sense of resistance to the player's fingers is reduced. This peak of resistance (let-off feeling) is essential for expressing delicate touches, and gives the player a pleasant sense of the end of the keystroke when the key stops. The hammer 10 rotates further due to inertia even after the jack 7 is removed, and operates the second switch 17 provided on the keyboard frame 2. During this time, the player is given the touch of an acoustic piano's hammer hitting the strings. The third switch 19 is actuated by the actuator 18 at a stroke position where the damper of the acoustic piano is inactive, and is inactivated at a stroke position where the damper is active. After the second switch 17 is activated, the hammer 10 is rotated clockwise by the weight 12 as shown in FIG.
Vibration is suppressed by contacting the key, and it does not rotate to the position when the key is released. At this time, the jack contact portion 11 of the hammer 10 is located above the hammer contact portion of the jack 7. When the key is released, the key 1 starts to move toward the initial position shown in FIG. Even if the key 1 moves further toward the initial position, the key 1 is blocked by the repetition lever 8, which rotates counterclockwise about the contact part with the cushioning material 27 of the frame 2 as a fulcrum, due to the elastic force of the leaf spring 9. The hammer 1 is rotated by the repetition lever 8 which rotates counterclockwise about the support part 1 as a fulcrum.
Rotation of 0 is prevented. Thus, in the state shown in FIG. 7, the tip of the jack 7 that does not rest on the jack contact portion 11 of the hammer 10 is positioned above the jack contact portion 11 of the hammer 10 as the key 1 moves to the initial position. When this happens, the elastic force of the leaf spring 9 allows the hammer 10 to quickly ride on the jack abutting portion 11 and return to its initial position, ready for the next keystroke. Therefore, you can hit the same key repeatedly at high speed like a trill.

In the above embodiment, the hammer 1 is activated by pressing the key and turning the jack 7 to activate the first switch 16.
When the second switch 17 is activated, a musical tone having a volume corresponding to the time until the second switch 17 is activated due to the rotation of the second switch 17 is emitted from a sound generator such as a speaker. It rotates when pushed and produces sound at a volume and timing similar to that of an acoustic piano, which produces sound when the strings are struck. In addition to normal strong and soft hits, you can also finely control the strong hits after pressing down on a key halfway, something that was impossible with conventional electronic pianos. The first switch 16, the second switch 17 and the third switch
A well-known circuit may be used for generating a musical tone signal of the above-mentioned volume by operating the switch 19.

[0015]

According to the invention as claimed in claim 1, when the key is released, the jack returns to the predetermined position and the next keystroke is possible even if the key does not return to the initial position. This has the effect of allowing repeated strikes, and according to the second aspect of the invention, the vibration of the hammer can be suppressed without increasing the number of parts unlike an acoustic piano.

[Brief explanation of drawings]

[Fig. 1] Fig. 1 is a partially cutaway side view of one embodiment of the present invention.

[Figure 2] Slanted view showing the relationship between the key, jack, repetition lever, and hammer

[Figure 3] Exploded slope view of the hammer fulcrum member and hammer

[Figure 4] Slope view of the hammer fulcrum member seen from diagonally below

[Figure 5] Partially cutaway side view showing the first process during key depression

[Figure 6] Partially cutaway side view showing the second process

[Figure 7] Partially cutaway side view showing the final process

[Figure 8] Side view of a conventional electronic piano

[Explanation of symbols]

1 key
2 Keyboard frame 7 Jack
8 Repetition lever 9 Leaf spring 10
Hammer 13 Hammer fulcrum member 14
Fulcrum part 16 First switch
17 Second switch 19 Third switch 26, 26a Catcher (part)

Claims (2)

[Claims] Claim 1: A keyboard device for an electronic piano comprising a jack that rotates by force transmitted from a key and a hammer that rotates by force transmitted from the rotating jack, wherein a jack and a repetition plate are provided in a hollow part of the key. This keyboard device for an electronic piano is provided with a rotatable lever, one end and the other end of an elastic member are respectively locked to the jack and repetition lever, and the jack and repetition lever are returned to their initial positions by the elastic member. [Claim 2] When the key is pressed, the hammer rotates due to the force transmitted from the rotating jack, and then a catcher is formed integrally with the key to contact the hammer and suppress vibration of the hammer before returning to the initial position. A keyboard device for an electronic piano according to claim 1, comprising: