JPH09274483A - Action mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an action mechanism of simpler constitution with nearly the same touch feeling as the keyboard touch feeling of a conventional acoustic piano. SOLUTION: When a jack tail 6 comes into contact with the cloth 34a of a regulating rail 34, the front end 4b of a jack 4 escapes rightward. A let-off is thereby generated. If the key touch state is maintained even after the let-off, a back check felt 8a comes into contact with the skin 24 of the back check contact surface 10c of a butt 10, thereby inducing a back stop. The touch feeling of the keyboard is nearly the same as the key touch of the conventional acoustic piano in spite of the absence of wippen and its attachments in such a manner and, therefore, the number of parts of the action mechanisms is decreased and the simple constitution is made possible. Then, the management of the arts is lessened, the production is facilitated and the cost is reduced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an action mechanism used for a piano or the like.

[0002]

2. Description of the Related Art A typical action mechanism in an acoustic piano, such as a grand piano, is as shown in FIG. 3 and has the following structure. That is,
When the keyboard 104 swings due to a key depression operation, it is pushed up by the capstan screw 106, and the wippen rail 1
The wippen 108 which is attached to the wippen flange 110 is swingable around a swing shaft 110a at the tip end, and the wippen 108 is swingable and can be swung on a swing shaft 108b at the tip end of the support column 108a which is raised as the wippen 108 is raised. The repetition lever 112 supported by the Wippen 1 as well.
The jack 114 and the hammer shank 11 that are swingably supported by the swing shaft 108c that rises with the rise of 08.
6, which is provided on the lower surface of the shank 6, and which is in contact with the tip 114a of the jack 114 that penetrates the long hole 112a at the tip of the repetition lever 112,
Due to the rise of the jack 114, the shank roller 118
When the hammer shank 116 is pushed up via the swing shank 116, it swings about the swing shaft 124a at the tip of the shank flange 124 attached to the shank rail 122, and the string 1
Before the hammer felt 120a of the hammer 120 collides with the hammer 120 and the string 126 that rise toward 26, the regulating button 128 that abuts on the tail portion 114b of the jack 114 and rapidly rocks the jack 114. The regulating rail 128a to which the button 128 is attached, the hammer 1 that falls after striking the string when the key-depressing state continues.
The action mechanism of the grand piano is composed of a back check 130 and the like that receives 20 on the way.

A typical action mechanism in an upright piano is as shown in FIG. That is, the balance pin 2 is swingably supported by the center rail 224 via the wippen flange 222, and when the key is pressed.
A capstan screw 220 that rises when the keyboard 206 swings around the fulcrum 18 serves as a swingable connection to a wippen 226 that swings in a direction opposite to the swinging direction of the keyboard 206 and a swingable connection to a jack spring 22.
Jack 22 biased counterclockwise in the figure by 8b
8. The butt 234 and the butt 234 are swingably supported by the center pin 232b of the bat flange 232a fixed to the center rail 224, and are pushed up to the tip of the jack 228 until the jack tail 228a contacts the regulating button 230. When the bat 234 is pushed up by the jack 228, the keyboard 2
The hammer 242 mounted on the tip of the hammer shank 236 that swings in the direction opposite to the swinging direction of 06, and the bat 23 that projects in a direction orthogonal to the hammer shank 236.
The catcher 240 mounted on the tip of the catcher shank 238 protruding from the No. 4 catches the catcher 240 that returns after striking the string when the key-depressing state continues.
The back check 226a etc. which stop the hammer 242 and the bat 234 on the way are provided.

[0004]

As described above, the action mechanism of the acoustic piano is a mechanism which requires a large number of components to be attached precisely, and which is expensive in terms of component management and manufacturing process. Therefore, it has been desired to reduce the number of parts of the action mechanism and simplify the configuration.

Some electronic pianos incorporate the action mechanism of the acoustic piano as a pseudo action mechanism in order to obtain the touch feeling of the keyboard of the acoustic piano. This kind of thing was the same as an acoustic piano in that many parts were incorporated intricately, only the hammer did not strike the strings. In particular, the electronic piano has the merit that the mechanical structure is simpler than that of the acoustic piano, so installing an action mechanism similar to the acoustic piano is a reverse idea, and the number of parts is the same as the acoustic piano. It was desired to reduce and simplify the configuration.

It is an object of the present invention to provide an action mechanism having a simpler touch feeling, which is almost the same as the touch feeling of a keyboard of a conventional acoustic piano.

[0007]

According to the action mechanism of the present invention, the jack is directly attached to the keyboard. That is, the jack is swingably attached to the upper surface of the rear portion of the keyboard, which is opposed to the key depression operation portion of the keyboard, with the swing center of the keyboard sandwiched therebetween. This makes it possible to omit the wippen.

Therefore, when the key depression operation portion of the keyboard is pushed down, the jack rises and pushes up the bat existing on the passing path of the jack at the tip of the jack. Then, the jack tail comes into contact with a movement preventing member (for example, a regulating rail in the embodiment described later), whereby the tip of the jack swings rapidly and moves away from the bat (let off), resulting in the bat and the hammer. Can move to inertial movement in the string striking direction. That is, since the let-off can be generated similarly to the action of the acoustic piano, it is possible to realize the action mechanism in which the touch feeling of the keyboard is almost the same as the action mechanism of the conventional complicated configuration. Moreover, since the wippen does not exist, the action mechanism including the wippen attachment member can be simplified. Therefore, the number of parts is reduced, part management is reduced, and manufacturing is facilitated.

Further, the jack may be provided with a back check projecting to the side opposite to the jack tail. With this, when the bat and the hammer return from the inertial motion in the string striking direction, when the keyboard is in the depressed state, the back check contacts a part of the bat, and the bat and the hammer It is possible to prevent the movement of and back to their original position. That is, the feel of a backstop can be given to the keyboard, and the touch feeling of the keyboard can be made almost the same as that of a conventional acoustic piano.

When the action mechanism of the present invention is used in an acoustic piano, the hammer hits the strings when it shifts to the inertial motion in the string striking direction. A hammer stop rail is provided to stop the inertial movement of the hammer in the string striking direction by contacting the hammer after the bat and the hammer move to the inertial motion in the string striking direction. As a result, it is possible to configure an electronic piano that employs a mechanism in which an actual sound is emitted from an electronic sound source, with only the touch feeling of the keyboard as a pseudo action being almost the same as that of a conventional acoustic piano.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a keyboard device using an action mechanism 2 as an embodiment. This state represents a state where no key depression operation is performed. The action mechanism 2 includes a jack 4, a jack tail 6, a back check 8, a bat 10, a hammer 12 and a stop rail 14, and is configured as a pseudo action.

The jack 4 is swingably attached to a jack flange 4a provided on a rear portion 16b of the keyboard 16. On the jack flange 4a, there is a key-depressing operation portion 16a at a position opposite to the balance pin 18 which is the swing center of the keyboard 16 so as to be opposed to each other.

A jack tail 6 is provided on the jack 4 so as to project at a position near the swing center of the jack 4 in a direction substantially orthogonal to the tip direction of the jack 4.
Further, the jack 4 is provided with a projecting piece 4c projecting to the side opposite to the jack tail 6, and the back check 8 is provided projecting obliquely upward from the projecting piece 4c. still,
A jack spring 6a is arranged between the jack tail 6 and the keyboard 16 to apply a counterclockwise biasing force to the jack 4 in the figure.

A center rail 20 is arranged above the rear portion 16b of the keyboard 16 with the arrangement direction of the keyboard 16 as the length direction, and the bat flange 10a is arranged on the center rail 20.
The bat 10 is swingably attached via the.
On the lower side of the butt 10, a small-diameter arc-shaped jack contact surface 10b and a large-diameter arc-shaped back check contact surface 10c are formed, and the contact surfaces 10b, 10c and the step surface 10d therebetween are formed. Has skins 22 and 24 or felt 26 attached thereto, respectively. The end surface of the tip portion 4b of the jack 4 contacts the skin 22 of the jack contact surface 10b of the bat 10, and the side surface of the tip portion 4b has the felt 26 of the step surface 10d.
Is in contact with

The butt 10 has a back check contact surface 10
A hammer 12 is attached adjacent to c, and a weight 12a is attached to the tip thereof. Then, the hammer rail portion 1 of the stop rail 14 is formed by the weight 12a portion.
It is in contact with a cushioning material 28 (for example, felt or urethane rubber) attached to the inner surface of 4a.

Further, the stop rail 14 is provided with a hammer stopper portion 14b at a position facing the hammer rail portion 14a, and a cushioning material 30 (for example, felt or urethane rubber) is attached to the inner surface thereof. Further, a regulating bracket 32 extends toward the center tail 20 in the direction of the jack tail 6 and a regulating rail 34 is attached to the tip thereof. A cross 34a is attached to the tip of the regulating rail 34 (corresponding to a movement preventing member).

When the key-depressing operation portion 16a of the keyboard 16 is pushed down, the rear portion 16b of the keyboard 16 rises in the direction of arrow U in FIG. At this time, the jack 4 ascends while pushing up the bat 10 with the tip portion 4b in contact with the skin 22 of the jack contact surface 10b of the bat 10 and the felt 26 of the step surface 10d. The jack 4 slightly swings counterclockwise in FIG. 1 with respect to the keyboard 16.

Then, as shown in FIG. 2A, the jack tail 6 is crossed by the crossing 34 of the regulating rail 34.
When abutting against a, the jack 4 pushing up the bat 10 rapidly swings clockwise in the figure, and the tip 4b of the jack 4 contacts the skin 22 of the jack abutting surface 10b and the felt 26 of the step surface 10d. From the current state, pull out to the right in the figure. As a result, the bat 10 and the hammer 12 that are not pushed up by the jack 4 are in an inertial motion state in the string striking direction. That is, let-off occurs.

In this state of inertial motion in the string striking direction, the weight 12
a collides with the cushioning material 30 of the hammer stopper portion 14b, and the hammer 12 starts the movement of returning in the opposite direction. Here, if the key-depressing state is maintained even after the let-off, the back check 8 is moved to the bat 1 by the rapid swing of the jack 4.
Swinging toward 0, back check felt 8a
As shown in FIG. 2B, the skin 24 of the back check contact surface 10c of the bat 10 returned by the collision between the hammer 12 and the cushioning material 30 of the hammer stopper portion 14b.
And the bat 10 and the hammer 12 are stopped halfway. That is, a back stop can be generated.

When the pressed state is released, the keyboard 16 and the action mechanism 2 return to the state shown in FIG. If the key-depressed state is released immediately after the let-off, the action mechanism 2 returns to the state shown in FIG. 1 without causing a backstop.
In the present embodiment, since the key depression detection switch 36 and the detection circuit 38 thereof are provided below the keyboard 16,
If a key depression operation is detected by an electronic control circuit (not shown) and a sound is produced by an electronic sound source, it functions as an electronic piano.

Since the present embodiment is constructed in this manner, it is possible to cause let-off and back stop like the conventional acoustic piano, even though the wippen and its accessories are not present. . Therefore, the touch feeling of the keyboard is almost the same as that of the conventional acoustic piano, the number of parts of the action mechanism is reduced, and the configuration can be simplified.

Therefore, part management is reduced, manufacturing is facilitated, and cost can be reduced. [Others] In the above-described embodiment, the action mechanism 2 is configured as a pseudo-action because it is an action mechanism incorporated in an electronic piano, but the hammer 12 is a hammer of an ordinary acoustic piano, and the position of the hammer stopper portion 14b. By arranging strings on the keyboard, it can be used also as an action mechanism of an acoustic piano, especially a grand piano, and like the above-mentioned embodiment, it is possible to obtain a touch feeling of a keyboard which is almost the same as that of a conventional acoustic piano, and an action mechanism. It is possible to reduce the number of parts of and to have a simple structure.

Further, if the entire action mechanism 2 is attached to the keyboard 16 in the left-right direction and the hammer 12 is positioned above the bat 10, it can be used as an action mechanism of an acoustic upright piano.
Similar effects can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a keyboard device using an action mechanism as an embodiment.

FIG. 2 is an operation explanatory diagram of an action mechanism as one embodiment.

FIG. 3 is a structural explanatory view of an action mechanism of a conventional grand piano.

FIG. 4 is a structural explanatory view of an action mechanism of a conventional upright piano.

[Explanation of symbols]

2 ... Action mechanism 4 ... Jack 4a ... Jack flange 4b ... Tip 6 ... Jack tail 6a ... Jack spring 8 ... Back check 8a ... Back check felt 10 ... Butt 10a ... Butt flange 10b ...
Jack contact surface 10c ... Back check contact surface 10d ... Step surface
12 ... Hammer 12a ... Weight 14 ... Stop rail 14a ... Hammer rail part 14b ... Hammer stopper part 16 ... Keyboard 16
a: key pressing operation part 16b: rear part 18: balance pin 20 ... center rail 22, 24 ... skin 26 ... felt 28, 30
... cushioning material 32 ... regulating bracket 34 ... regulating rail 34a ... cross 36 ... key detection switch 38 ...
Detection circuit

Claims (3)

[Claims] 1. A jack swingably attached to a rear upper surface of a keyboard facing a key depression operation portion of the keyboard with a swing center of the keyboard sandwiched therebetween, and the jack is raised as the keyboard swings. A bat that is swingably arranged on a path that passes when the bat, a hammer that is attached to the bat, a jack tail that projects from the jack in a direction substantially orthogonal to the tip direction of the jack, and the keyboard When the key operation portion of the keyboard is pushed down, the movement preventing member is provided on a path through which the jack tail passes when the jack rises due to the swinging of the jack. Rises, pushes up the butt with the tip of the jack, and then the jack tail abuts against the movement preventing member, whereby the tip of the jack rapidly rocks. Away from the vat Te, As a result, the action mechanism and the said butt hammer characterized in that the move to the inertial movement of the string striking direction. 2. When the bat and the hammer return from inertial movement in the string striking direction, the jack is provided with a back check projecting to the side opposite to the jack tail. In the case where the keyboard is in a depressed state, the back check contacts a part of the bat to prevent the bat and the hammer from completely returning to their original positions. The action mechanism according to claim 1. 3. A hammer stop rail for stopping the inertial motion of the hammer in the string striking direction after coming into contact with the hammer after the bat and the hammer have moved to the inertial motion in the string striking direction. The action mechanism according to claim 1 or 2, wherein the action mechanism is configured as a pseudo action.