JP2581771Y2 - Keyboard for electronic musical instruments - 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 piano having a keyboard and a hammer as a mass that is pressed and rotated.

[0002]

2. Description of the Related Art In a conventional keyboard device for an electronic piano, a keyboard b is mounted on a keyboard chassis a so as to be rotatable around a fulcrum c as shown in FIG.
A hammer-like body e is provided as a mass body which is pressed by the keyboard b and rotates around a fulcrum d.

A cushion member f is provided at a contact portion between the keyboard b and the hammer-shaped body e, and a hammer upper limit stopper g is provided above the hammer-shaped body e.

[0004]

FIG. 4 shows a load characteristic with respect to a keystroke when the above-described conventional electronic piano is actually struck, and the peak in B in the figure is a hammer-like body e.
Is rotated by depressing the keyboard b, collides with the upper limit stopper g of the hammer, rebounds, and is caused by a shock at the time of collision with the keyboard b. There was a problem that.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a keyboard device for an electronic musical instrument capable of obtaining a key touch with less discomfort.

[0006]

According to the present invention, a keyboard 1 and a hammer 2 as a mass body are provided to achieve the above object.
A keyboard device for an electronic musical instrument, comprising: a keyboard 1 mounted on a base 3 and having a lever 5 rotatable around a fulcrum member 4 and rotatably provided at a rear end portion. The hammer-shaped body 2 is supported by the fulcrum member 6 above the rear end of the keyboard 1 so as to be pushed by the rear end and rotate in the opposite direction to the keyboard 1. The lever 5 has a spring 7, a back check surface 9 to which a cushion material 8 is attached is formed on an upper surface, and a contact surface 10 that contacts the base 3 surface is formed on a lower surface, and the spring 7 is , Always press the contact surface 10 against the base 3, rotate the lever 5 when pressing the keyboard 1 to raise the back check surface 9 of the lever 5, and receive the corresponding surface of the hammer 2 on the back check surface 9. It is characterized by the following.

[0007]

When the keyboard 1 is depressed, the hammer 2 at the rear end of the keyboard 1 is turned in the opposite direction to the keyboard 1 (clockwise in the illustrated state).
). The above-mentioned hammer is provided above the hammer 2.
The same hammer upper limit stopper as the upper limit stopper g is attached
The hammer-shaped body 2 is in contact with the hammer upper limit stopper.
Rebounds and turns in the opposite direction (also counterclockwise)
Moves and tries to hit the rear end of the keyboard 1. However , when the keyboard 1 is depressed, the lever 5 provided at the rear end is rotated by the spring 7, the back check surface 9 stands up, and the rear end of the keyboard 1 is moved.
Since it protrudes from the upper surface of the portion 13 , the hammer-shaped body 2 comes into contact with the back check surface 9 . The cushion member 8 is attached to the back check surface 9 and the lever 5 rotates against the spring force of the spring 7 when the hammer-shaped body 2 collides. Is absorbed by the rotation of the cushion member 8 and the lever 5. Therefore, the vibration is not transmitted to the finger when the key is pressed, and the player does not feel uncomfortable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. In FIG. 1, a keyboard 1 is rotatable around a fulcrum member 4 composed of a reed 11 and balance pins 12 on a base 3 which is, for example, a keyboard chassis. Behind the rear end 13 of the keyboard 1, a hammer-shaped fulcrum member 6 is provided, and the hammer-shaped body 2 is turned in the opposite direction to the keyboard 1 by the rear end 13 of the keyboard 1. ing. The above configuration is not particularly different from the conventional configuration.

The present invention is characterized in that a rotatable lever 5 is provided at the rear end 13 of the keyboard 1, and this lever 5 is
It is inserted into a groove 14 formed in the rear end 13 of the keyboard 1, and is pivotally supported by penetrating a metal pin 17 made of brass or the like into the hole 15 of the lever 5 and the holes 16, 16 of the keyboard 1.
A bushing cloth 18 is provided on the inner walls of the holes 16 and 16 of the keyboard 1.
A lubricant such as graphite is applied to a contact surface of the pushing cloth 18 with the pin 17.
Of the bearing portion. This lever 5 has a groove 19
The coil 2 is inserted into
The spring 7 is attached by inserting 1.
One end of the spring 7 to the cushion material 21 -1 and artificial leather which is attached to the lower surface of the keyboard 1, the other end is brought into contact with the cushion material 22 such as an artificial leather which is attached to the lever 5, the spring 7
Urges the lever 5 in the counterclockwise direction in FIG.
The contact surface 10 at the lower end of the lever 5 is always brought into contact with a cushion material 23 such as artificial leather on the base. A cushion material 8 such as artificial leather is stuck on the upper surface of the lever 5 to form a back check surface 9, and as shown in FIG. Although it is horizontal at substantially the same height as the upper surface of the keyboard 1, when the keyboard 1 is depressed, the back check surface 9 of the lever 5 rises as the rear end 13 moves upward, as shown by the broken line, 1
Protrudes from the upper surface of the rear end portion 13.

Thus, when the keyboard 1 is depressed, the hammer-shaped body 2 rotates, collides with a hammer upper limit stopper (not shown), and then rotates in the opposite direction. Lever 5 in key pressed state
Back check surface 9 of standing as indicated by two-dot chain lines in FIG. 1, since protruding from the upper surface of the rear end portion 13 of the keyboard 1, the hammer-like body 2 which is rotated in the reverse direction end after the keyboard 1 13 and is applied to the hammer-shaped body 2 before hitting the upper cushion material 24.
Back check contact surface made of cushion material 25
It comes into contact with the back check surface 9 . When the key is released, the lever 5 returns to the illustrated position.

[0011]

[Effect of the Invention] Since the present invention is configured as described above, the shock applied to the keyboard when the hammer-shaped body rotated by pressing down the keyboard returns to the original position is relieved, and the player feels discomfort. It has the effect of not giving.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the embodiment.

FIG. 3 is a schematic side view of a conventional keyboard device for an electronic musical instrument.

FIG. 4 is a load characteristic diagram with respect to a key stroke of the device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard 2 Hammer-like body 3 Base 5 Lever 7 Spring 8 Cushion material 9 Back check surface 10 Contact surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A keyboard (1) and a hammer body as a mass body
(2) a keyboard device for an electronic musical instrument, wherein the keyboard (1) is mounted on a base (3), is rotatable around a fulcrum member (4), and is rotated to a rear end portion. A hammer-like body (2) located above the rear end of the keyboard (1) and pushed by the rear end to be separated from the keyboard (1). The lever (5) is supported by a fulcrum member (6) so as to rotate in the opposite direction. The surface (9) is provided with a contact surface (10) on the lower surface, which contacts the surface of the base (3) .The spring (7) always presses the contact surface (10) against the base (3),
When the key (1) is pressed, rotate the lever (5) to raise the back check surface (9) of the lever (5), and the back check surface (9)
A keyboard device for an electronic musical instrument, wherein the keyboard device receives the corresponding surface of the hammer-like body (2).