JPH07281660A - Keyboard support mechanism of grand piano - Google Patents

Abstract

PURPOSE:To prevent a noise generated from a keybed accompanying a key depression in the grand piano which provides a musical performance by an electronic sound source in addition to a musical performance by normal key striking. CONSTITUTION:On the keybed 1, a key frame front lower part 5 and a key frame rear part 7 are mounted and support a key frame end 9. At the front part of the top surface of the key frame end 9, a key frame front upper part 17 is fixed, and a foamed urethane layer 22a is arranged as a shock absorbing member so that the key frame front lower part 5 and key frame front upper part 17 are held by the part projecting from the front surface of the rod end 9. In this constitution, the shock generated when the front part of a keyboard 3 and the key frame front upper part 17 abuts on each other is absorbed by the formed urethane layer 22a, so a noise generated by the vibration of the key frame front lower part 5 and floor plate 1 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard support mechanism for a grand piano, which includes a reed on which a keyboard is swingably mounted and a shelf plate which supports the reed.

[0002]

2. Description of the Related Art Conventionally, an acoustic piano has been combined with an electronic sound source so that, in addition to the usual performance by striking strings,
A grand piano has been proposed that enables playing with an electronic sound source. In such a grand piano, a sound stop device is used that prevents a hammer from striking a string at a predetermined position when playing with an electronic sound source to prevent a sound from being striking.

According to this, no string-striking sound is generated, and if the performance sound from the electronic sound source based on the keyboard operation is heard while listening to the sound through headphones or the like, the performance sound does not leak to the outside, and in a housing complex or a densely-populated area of a house. There is an advantage that you can freely perform the performance of, or practice at night.

[0004]

However, according to such a conventional technique, when the electronic tone generator is used to prevent the occurrence of string striking sound, when a grand piano is played by a normal string striking method, The noise associated with the key depression that has been erased by the string striking sound and its resonance can be heard. In particular, when playing while listening to the performance sound from the electronic sound source based on the keyboard operation with headphones or the like, a person other than the performer is worried about the noise, and the above advantage is impaired. .

This noise is generated mainly by the impact of the keyboard being pressed, causing the reed to vibrate, and the impact being transmitted through the reed to the shelf supporting the reed below it, causing the shelf to vibrate. To do. In the case of a grand piano, since the reed is not fixed to the shelf board, if the reed or shelf board warps due to moisture etc., the gap created by the warpage will vibrate when the key is pressed and noise will be generated from the shelf board. .

The present invention has been made in view of the above problems, and in a keyboard supporting mechanism of a grand piano which enables not only ordinary string playing but also electronic sound source, when playing with an electronic sound source, The purpose is to prevent noise from being generated from the reed and the shelf board when the key is pressed.

[0007]

In order to solve the above problems, the present invention provides a keyboard support for a grand piano that includes a reed on which a keyboard is swingably mounted and a shelf board that supports the reed. In the mechanism, the reed includes an impact absorbing member that absorbs an impact caused by a key depression.

A keyboard support mechanism for a grand piano according to a second aspect is the same as the keyboard support mechanism for a grand piano according to the first aspect, in which the reed has a reed supporting front portion of the keyboard and a rear portion of the keyboard. Consisting of a reed after supporting, a reed gable arranged between the reed before and after the reed, and a reed middle disposed on the reed and supporting a swinging fulcrum of the keyboard, The shock absorbing member is fixed before the reed.

A keyboard supporting mechanism for a grand piano according to a third aspect is the keyboard supporting mechanism for a grand piano according to the second aspect, in which the reed is divided into upper and lower parts and the shock absorbing member is divided into upper and lower parts. It is characterized in that it is fixed so as to be clamped in front of the reed.

A keyboard support mechanism for a grand piano according to a fourth aspect is the same as the keyboard support mechanism for a grand piano according to the first aspect, wherein the reed has a reed supporting front portion of the keyboard and a rear portion of the keyboard. Consisting of a reed after supporting, a reed gable arranged between the reed before and after the reed, and a reed middle disposed on the reed and supporting a swinging fulcrum of the keyboard, The shock absorbing member is fixed after the reed.

A keyboard support mechanism for a grand piano according to a fifth aspect is the same as the keyboard support mechanism for a grand piano according to the fourth aspect, in which the rear of the reed is vertically divided and the impact absorbing member is vertically divided. It is characterized in that it is fixed so as to be clamped after the reed.

[0012]

According to the keyboard support mechanism of the grand piano having the structure described in claim 1, the impact applied to the reed by the key depression is absorbed and weakened by the impact absorbing member fixed to the reed. Then, it is transmitted to the shelf board on which the reed is placed. Therefore, unlike the conventional keyboard support mechanism in which the impact absorbing member is not fixed to the reed, the shelf plate or the reed itself vibrates to generate noise when a key is pressed.

According to the keyboard support mechanism of the grand piano having the structure described in claim 2, the impact applied to the front of the reed by the key depression is absorbed by the impact absorbing member fixed to the front of the reed, After being weakened, it is transmitted to the shelf board on which the reed is placed. Therefore, unlike the conventional keyboard support mechanism in which the impact absorbing member is not fixed before the reed, the shelf plate or the reed itself does not vibrate to generate noise when a key is pressed.

According to the keyboard support mechanism of the grand piano having the structure described in claim 3, the impact applied to the front of the reed by the key depression is absorbed by the impact absorbing member sandwiched in front of the reed, After being weakened, it is transmitted to the shelf board on which the reed is placed. Therefore, unlike the conventional keyboard support mechanism in which the shock absorbing member is not sandwiched before the reed, the shelf plate or the reed itself does not vibrate to generate noise when a key is pressed.

According to the keyboard support mechanism of the grand piano having the structure described in claim 4, the impact is generated when the keyboard returns to its original position after the key depression and the rear part of the keyboard abuts after the reed. Is absorbed by the impact absorbing member fixed after the reed and weakened, and then transmitted to the shelf board on which the reed is placed. Therefore, unlike the conventional keyboard support mechanism in which the shock absorbing member is not fixed after the reed, the shelf plate or the reed itself does not vibrate to generate noise.

According to the keyboard supporting mechanism of the grand piano having the structure described in claim 5, after the key is pressed, the keyboard is returned to its original position, and the impact when the rear part of the keyboard abuts after the reed is generated. After being absorbed and weakened by the shock absorbing member sandwiched after the reed, it is transmitted to the shelf board on which the reed is placed. Therefore, unlike the conventional keyboard support mechanism in which the shock absorbing member is not clamped after the reed, the shelf plate or the reed itself does not vibrate to generate noise when a key is pressed.

Further, in the keyboard support mechanism of any of the grand pianos described in claims 1 to 5, noise is not generated from the reed and the shelves, so that the noise is generated even during a normal performance of striking a string. It emits a few high-quality string sounds,
The quality as an acoustic piano also increases.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a basic configuration of a keyboard support mechanism of a grand piano of this embodiment.

On a shelf plate 1 whose both sides are fixed to a piano body (not shown), there are a reed front lower part 5 and a reed rear part 7 which are substantially plate-like members both extending along the arrangement direction of the keyboard 3. It is placed and the reed gable 9 is disposed between the two. The reed girder 9 is a frame-shaped member, and the rear end 7 of the reed girder 9 is fixed so that the rear end surface of the reed girder 9 contacts the front of the reed girder 7. Is fixed so that it is placed, and the front surface 5 of the reed lower part 5
a is projected from the front surface of the reed gable 9.

At the center of the upper surface of the reed gable 9 in the front-back direction,
A reed inside 13 which is a rod-shaped member extending along the arrangement direction of the keyboard 3 is attached to the reed inside 13.
The balance pin 15 for swingably supporting the keyboard 3
The number of keyboards 3 is arranged at intervals of.

In addition, at the front part of the upper surface of the reed gable 9, the reed upper part 1
7, the front surface 17a thereof is fixed by being protruded from the front surface of the reed gable 9 by the same amount as the front surface 5a of the lower reed front portion 5. The reed front upper part 17 is a substantially plate-shaped member that is substantially equal in length to the reed front lower part 5 and extends along the arrangement direction of the keyboard 3, and has step-like stepped surfaces 17b and 17c on the upper and lower sides. Is provided in
The front surface 17b is raised.

Further, a front punching cloth 19 is attached to the upper surface 17b of the upper part 17 of the reed, and the front pin 2 is inserted so as to penetrate the front punching cloth 19.
1 is struck. The front pins 21 are provided for restricting the movement of the keyboard 3 in the arrangement direction of the keyboard 3, and are arranged by the number of the keyboard 3 at intervals of the keyboard 3.

A urethane foam layer 22a is provided as a shock absorbing member so that the lower reed 5 and the upper reed 17 are sandwiched between the portions of the reed 9 protruding from the front surface.
The urethane foam layer 22a includes a reed lower part 5 and a reed upper part 1
Similar to 7, it is a substantially plate-shaped member extending along the arrangement direction of the keyboard 3, and has substantially the same length as the lower reed front part 5 and the upper reed part 17.

A keyboard pillow cloth 23, which is a rod-shaped member extending along the arrangement direction of the keyboard 3, is provided on the upper surface of the reed 7 so that the rear portion of the keyboard 3 does not directly touch the reed 7. , Abut on the keyboard pillow cloth 23. The keyboard 3 is swingably supported by the balance pin 15 and the front pin 21, and its rear portion is supported by the keyboard pillow cloth 23 to take a stable posture.

Note that FIG. 1 shows the main members related to the support of one white key among the plurality of keyboards of the grand piano, and the structure thereof. Therefore, other components, for example, members related to the black key and the shape related thereto, and the part related to the action mechanism for striking the string with the key depression are omitted, and more specifically, The front pin that controls the movement of the black keys in the direction of arrangement is the upper part of the reed 1 in this figure.
Although it is driven into the upper surface 17c of No. 7, it is omitted in this figure.

When the key pressing operation is performed in the keyboard supporting mechanism of the grand piano having the above-mentioned structure, the keyboard 3
Swings around the balance pin 15 as a fulcrum, and the front portion of the keyboard 3 comes into contact with the front punching cross 19. Front punching cloth 19 when normal key depression is performed
Can elastically deform to absorb the impact at the time of contact, but f (forte) and ff (fortissimo)
As described above, when the key is strongly pressed, the impact that cannot be absorbed due to the elastic deformation of the front punching cloth 19 is transmitted to the reed front upper part 17, and the reed front upper part 17 is deformed.

When the reed upper part 17 and the shelf 1 are in a normal state, the deformation of the reed upper part 17 is insignificant, and vibrations that cause noise are not generated, but the reed is damaged by moisture or the like. If the upper portion 17, the shelf board 1, or other portion of the keyboard support mechanism is warped, the warped portion tends to vibrate due to an impact when a key is pressed. Then, the urethane foam layer 22a arranged on the lower surface thereof absorbs the vibration and prevents the vibration from being transmitted to the reed lower part 5, the shelf board 1, or other parts of the reed, and also the vibration of the reed upper part 17 itself. suppress. Therefore, it is possible to prevent noise from being generated from the reed and the shelf 1.

The structure of the present invention is not limited to the above-mentioned embodiment, and may be, for example, as shown in FIG. That is, as in the above configuration, the urethane foam layer 22a is formed at the portion where the front surfaces of the reed upper part 17 and the reed lower part 5 are protruded from the front of the reed gable 9.
Instead of sandwiching, the urethane foam layer 22b is fixed to the lower surface of the reed front lower part 5 so that it is sandwiched between the reed front lower part 5 and the shelf board 1.

Also with this structure, even if the impact when the key is pressed is transmitted to the reed upper part 17, the reed gable 9, and the reed lower part 5, the urethane foam layer 22b absorbs the impact, so that the reed and the shelf board 1 are vibrated. It is possible to suppress and obtain the same effect as that of the above embodiment.
Further, the keyboard support mechanism of the present invention may have a structure as shown in FIG. That is, in addition to the configuration in which the urethane foam layer 22b is fixed to the lower surface of the lower reed 5 shown in FIG. 2, the urethane foam layer 22c is also fixed to the lower surface of the reed 7 and is sandwiched between the reed 7 and the shelf board 1. To be done.

According to this structure, in addition to the effect of the keyboard support mechanism shown in FIG. 2, noise generated near the reed 7 can be prevented. The noise is generated when the pressed keyboard 3 returns to its original state, that is, the state in which the rear portion of the keyboard 3 is supported by the keyboard pillow cloth 23. In a normal key depression, the impact at the time of abutment is absorbed by the keyboard pillow cloth 23, but the keyboard pillow cloth 23 is so strongly impacted that it cannot be absorbed, and after the reed 7 or the shelf 1 When the rear part is warped, that part (rear 7 or shelf 1) vibrates and noise is generated.
In order to suppress both the noise and the noise generated in the vicinity of the reed when the key is pressed, for example, the configuration shown in FIGS. 4 to 6 may be used in addition to the configuration shown in FIG.

That is, in FIG. 4, the reed is divided into a reed upper part 7a and a reed lower part 7b, and the urethane foam layer 22 is interposed therebetween.
d is sandwiched, and the reed front is divided into a reed front upper portion 17 and a reed front lower portion 5 similarly to the configuration shown in FIG. 1, and a urethane foam layer 22a is sandwiched therebetween.

FIG. 5 shows the rear part of the reed and the lower part of the reed 7 after the reed.
The urethane foam layer 22d is sandwiched between them and the urethane foam layer 22b is fixed to the lower surface of the lower reed front part 5. In FIG. 6, a urethane foam layer 22c is fixed to the lower surface of the reed rear part 7, and the reed front is divided into a reed upper part 17 and a reed lower part 5 in the same manner as the configuration shown in FIG. 22a is sandwiched.

In any of the keyboard supporting mechanisms shown in FIGS. 3 to 6, both the noise generated when the keyboard 3 is pushed in and the noise generated when the keyboard 3 is returned to its original state are suppressed. You can Further, the keyboard support mechanism according to any of the configurations shown in FIGS.
Since it is possible to prevent the above noise from being generated, it is possible to play without noise not only when playing with an electronic sound source, but also when playing with a normal string, so that the quality as an acoustic piano is also improved. Can be increased.

Therefore, the keyboard support mechanism of the present invention can be applied to an ordinary grand piano that does not have a performance function by an electronic sound source, and can generate a purer string striking sound and perform a high quality performance. it can.

[0035]

According to the keyboard support mechanism for a grand piano of claim 1, when the electronic tone generator is used to prevent the generation of string striking sound, the shelf is caused by the impact applied to the reed by the key depression. It is possible to prevent the plate and the reed from vibrating and to suppress the generation of noise.

According to the keyboard support mechanism of the grand piano of the second aspect, the shock absorbing member fixed to the front of the reed absorbs the shock when the key is pressed, so that the shelf plate and the front of the reed are prevented from vibrating. However, the generation of noise can be suppressed. According to the keyboard support mechanism of the grand piano of claim 3, since the shock absorbing member sandwiched between the vertically divided reeds absorbs the impact at the time of key depression, the shelf plate and the reeds vibrate. Can be prevented, and the generation of noise can be suppressed.

According to the keyboard support mechanism of the grand piano of the fourth aspect, after the key is pressed, the keyboard returns to its original state, and the rear part of the keyboard is shocked when the rear part of the keyboard touches the reed or the key pillow cloth. It is possible to prevent vibrations on the board and after the reed and suppress the generation of noise. According to the keyboard support mechanism for a grand piano of claim 5, the impact absorbing member sandwiched between the vertically divided reeds returns to the original state after the key is pressed, and the rear portion of the keyboard is Since the shock is absorbed when the reed is in contact with the keyboard pillow cloth or after the reed, it is possible to prevent the shelf plate and the reed from vibrating and suppress the generation of noise.

Further, since the noise is unlikely to occur in any of the keyboard support mechanisms according to the first to fifth aspects, a high-purity string striking sound with little noise is also generated during a normal performance of string striking. And the quality as an acoustic piano can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a keyboard support mechanism of an embodiment.

FIG. 2 is a side view showing a configuration of a keyboard support mechanism in which a shock absorbing member is fixed to a lower surface in front of a reed as another embodiment.

FIG. 3 is a keyboard support mechanism in which one of the shock absorbing members formed as two plate-shaped members is fixed to the lower surface before the reed and the other one is fixed to the lower surface after the reed as another embodiment. It is a side view which shows the structure of.

FIG. 4 shows another embodiment of the shock absorbing member formed as a two-piece plate-like member, in which one is sandwiched between the upper and lower halves of the reed, and the other one is vertically laid after the reed. It is a side view which shows the structure of the keyboard support mechanism pinched | interposed between the divided.

[FIG. 5] As another embodiment, of the shock absorbing members formed as two plate-like members, one is fixed to the lower surface before the reed, and the other is sandwiched between the upper and lower halves of the reed. It is a side view which shows the structure of the keyboard support mechanism made to do.

FIG. 6 shows, as another embodiment, of the shock absorbing member formed as a two-piece plate-shaped member, one is sandwiched between the upper and lower halves of the reed, and the other is fixed to the lower surface after the reed. It is a side view which shows the structure of the keyboard support mechanism made to do.

[Explanation of symbols]

1 ... Shelf board 3 ... Keyboard 5 ... Reed front lower part 7 ... Reed back 9 ... Reed wife 13 ... Reed middle 17 ... Reed front upper part 22a, 22b, 22c, 22d ...
Urethane foam layer

Claims (5)

[Claims] 1. A keyboard supporting mechanism for a grand piano, comprising: a reed on which a keyboard is swingably mounted; and a shelf for supporting the reed, wherein the reed absorbs the impact of key depression. A keyboard support mechanism for a grand piano, which is provided with members. 2. The keyboard support mechanism for a grand piano according to claim 1, wherein the reed supports the front part of the keyboard, the reed supports the rear part of the keyboard, the reed supports the front, and the reed supports. The shock absorbing member is fixed to the front of the reed, and the reed is provided between the rear and the reed, and the reed is provided on the reed to support the swinging fulcrum of the keyboard. A keyboard support mechanism for grand pianos. 3. The keyboard support mechanism for a grand piano according to claim 2, wherein the reed is divided into upper and lower parts, and the shock absorbing member is fixed so as to be sandwiched between the upper and lower divided reeds. A keyboard support mechanism for grand pianos. 4. The keyboard support mechanism for a grand piano according to claim 1, wherein the reed has a reed that supports a front part of the keyboard, a reed that supports a rear part of the keyboard, a reed before and a reed. The reed is arranged between the rear and the reed, and the reed is arranged on the reed to support the swinging fulcrum of the keyboard, and the shock absorbing member is fixed after the reed. A keyboard support mechanism for grand pianos. 5. The keyboard support mechanism for a grand piano according to claim 4, wherein the rear of the reed is divided into upper and lower parts, and the shock absorbing member is fixed so as to be clamped after the divided reed of the upper and lower parts. A keyboard support mechanism for a grand piano.