JPH06214558A - Damper device for grand piano - Google Patents

Abstract

PURPOSE:To damp a grand piano sound by a mechanism similar to that of an upright piano, to guarantee a decrease in load placed on a key by damping, and to eliminate difficulties at the time of disassembling, assembling, and adjustments of an action mechanism. CONSTITUTION:This device is equipped with a damping means 20 which damps the sound by shortening a stroke by supporting a hammer shank a specific distance above its normal position toward strings 3, and a load placing means 30 which prevents the key 5 from being lowered by supporting the key 5 from below in front of a balance pin 7 when the damping means 20 is in operation. The damping means 20 is a mechanism similar to that of the upright piano, so the sound can securely be damped; and the load placing means 30 is below the key 5, so it never hamper disassembling and assembling of the action mechanism, and various adjustments.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound damping device for a grand piano, and more particularly to a sound damping device of the type that reduces the volume during playing by shortening the distance between the hammer and the strings as in the upright piano. .

[0002]

2. Description of the Related Art Conventionally, a soft pedal mechanism for laterally shifting a hammer position and a muffler mechanism for interposing a muffler felt between a hammer and a string have been adopted as a weak sound device of a grand piano. However, the soft pedal mechanism is not used to weaken the sound, but rather to change the timbre to broaden the range of performance expression, and the softening effect could not be improved so much. Also, the muffler mechanism can weaken the sound in the high range, but it is difficult in the low range, and the timbre is deteriorated so that the performance is not tense.

For these reasons, in recent years, there has been proposed a device for reducing the sound by reducing the distance between the hammer and the string (hereinafter referred to as a striking distance) in the grand piano, like the weak sound device of the upright piano. (For example, JP-A-4-34497). In the sound damping device described in this publication, further, as shown in FIG. 4, a leaf spring 101 is arranged in the back of the key, or a load arm 103 is arranged in front of the capstan button 15, and when the sound is weakened, the key 5 is released. The load-applying means was used to prevent the drop.

[0004]

However, since there are various parts such as an action mechanism above the key, in the system in which the leaf spring 101 is arranged in the back of the key 5, the leaf spring 101 is replaced by the key 5.
It was necessary to remove the action mechanism for fine adjustment of the load applied to. In addition, since the space behind this key is small, there are large restrictions on the attachment of the leaf spring 101.

On the other hand, also in the load arm 103, it was necessary to remove the load arm 103 when the action mechanism was pulled out. In addition, the load arm 103 has been an obstacle to various adjustment work of the action mechanism such as adjustment of the capstan button 15. Therefore, the present invention is
In the grand piano, the same mechanism as the upright piano is used to weaken the sound, guarantee that the load received by the key is reduced by the weak sound, and give a load that does not hinder the disassembly / assembly and adjustment of the action mechanism. It is an object of the present invention to provide a noise reduction device having means.

[0006]

The weakening device for a grand piano of the present invention, which has been completed to achieve the above object, raises a supporting position of a hammer when not hitting by a predetermined distance as compared with a normal position. , A weak sound of a grand piano provided with a weakening means for suppressing the force of a hammer striking a string to lower the volume during a performance, and a load applying means for ensuring a load that is not applied to a key by the operation of the weakening means. In the device, the load applying means is provided in a lower part of the key on the front side of the rotation center of the key, and supports the key from below to ensure the load.

According to the weak sound device of the grand piano of the present invention, since the load applying means supports the key from below on the front side of the rotation center of the key, the key can be lowered even if the hammer is lifted by the weak sound means. There is no sound, and the player feels the same load as when playing a key. Moreover, since the load applying means is provided in the lower part of the key on the front side of the rotation center of the key, it does not hinder the action mechanism from being taken in and out at the time of assembly, and does not hinder the adjustment of the action mechanism in the assembled state. I won't.

[0008]

EXAMPLES In order to clarify the contents of the present invention described above, examples will be described below. In the grand piano of the embodiment, as shown in FIG. 1, the hammer shank 1 is supported at a position raised by a predetermined distance to the string 3 side from the normal position to shorten the string striking distance and reduce the sound. 20 and the key 5 when the noise reduction means 20 is operating.
It is provided with a load applying means 30 that prevents the key 5 from being lowered by supporting it from the lower side of the front side.

As shown in FIGS. 1 and 2, the noise reduction means 20 supports a hammer rail 21 at both ends with arms 22, and pushes up the lower surface of the arm 23 with a push-up member 25 so that the hammer shank 1 is predetermined. It is configured to raise the distance. That is, the hammer rail 21 is screwed and fixed to the arm 23 at both ends, and is not fixed to the hammer rail receiver 9. The hammer rail receiver 9 is left to normally support the hammer rail 21 from below and play a role of defining the normal position of the hammer shank 1.

The arm 23 is an action bracket 11.
Is rotatably fixed to the upper end of the via a hinge block 27. The push-up member 25 is the support rail 1
It is fixed to a rotating shaft 29 arranged along the line 3. The rotation shaft 29 is rotated 35 degrees clockwise in the drawing by operating a sound attenuation instruction member (for example, a pedal) (not shown) to push up the arm 23. Then, the arm 23 rotates upward around the hinge block 27 and pushes up the hammer shank 1. In this way, the striking distance is shortened,
The force with which the hammer 2 hits the string 3 when the key is pressed is suppressed, and the sound is weakened. When the sound reduction instruction member is returned to the original position, the push-up member 25 returns to the original position, and the arm 23 and the hammer rail 21 are lowered by their own weight to the position where they come into contact with the hammer rail receiver 9. Note that reference numeral 41 in FIG. 2 is a hammer felt, and reference numeral 43 is artificial leather.

As shown in FIGS. 1 and 3, the load applying means 30 corresponds to each of the reeds 31 having a semicircular cross section and extending in the width direction along the lower surface of the key 5 and 88 keys 5. And a leaf spring 33 made of phosphor bronze disposed on the upper surface of the reed 31,
And a lever 35 for rotating the reed 31. Reed 31
Both ends are rotatably supported by a block 37 provided on the shelf plate 19. Each leaf spring 33 has a spring constant adjusted for each key in accordance with the load of the action mechanism that each key 5 normally receives. When the lever 35 is pulled toward you, the reed 31 rotates counterclockwise in the drawing, and the leaf spring 33 supports the lower surface of the key 5. The lever 35 is also operated when operating the noise reduction means 20.

By the action of the load applying means 30, the hammer load which is not applied to the key 5 at the time of releasing the key due to the weakening of the sound is guaranteed, and the key 5 is not lowered. Further, even when playing in a weakened state, the touch of the key is the same as in the normal state, and it is possible to play without feeling discomfort. Furthermore, the load applying means 30 does not interfere with the adjustment of the capstan button 15. In addition, the load applying means 30 does not get in the way when the entire action mechanism is taken in and out and the key 5 is attached and detached. Then, in fine adjustment of the load applying means 30 itself, only the key 5 needs to be removed, and fine adjustment can be performed very easily.

In addition, in the present embodiment, the load applying means 30 can be made not to function in normal operation by operating the lever 35, so that the keys are not felt heavy during normal playing. Although one embodiment of the present invention has been described above, the present invention is not limited to this, and various modes can be adopted without departing from the scope of the present invention.

For example, in the embodiment, the noise is reduced by raising only the hammer shank 1, but it is also possible to raise the entire action mechanism. Further, in the embodiment, the noise reduction means 20 and the load application means 30 are configured to be operated separately and independently, but it is better to be able to operate both in cooperation with each other. In addition, the load applying means 30 may use a coil spring instead of a leaf spring.

Further, the present invention can be applied not only to the acoustic piano but also to a grand piano having an automatic performance function. In this case, even if the sound is weakened to automatically play like a BGM, the key will move as it normally does, and you can enjoy the fun of the automatic playing piano, which is the operation of the key during the automatic performance. Is particularly suitable. It should be noted that in an automatic playing piano, even if a load is applied to the keys during normal automatic playing, it does not cause a problem so much so that the load applying means does not function normally in the normal operation by lever operation. It does not need to have the mechanism of.

[0016]

As described above, according to the weakening device for a grand piano of the present invention, it is possible to weaken the sound of the grand piano by a mechanism similar to that of the upright piano, and the load received by the key is weakened. It is possible to guarantee the decrease and prevent the key from falling and the feeling of strangeness in the touch when the sound is weakened. Further, the load applying means,
The disassembly / assembly / adjustment can be easily performed without hindering the disassembly / assembly or adjustment of the action mechanism.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of a weak sound device of a grand piano of an embodiment.

FIG. 2 is an explanatory diagram showing a noise reduction means adopted in the embodiment.

FIG. 3 is an explanatory view showing a load applying means adopted in the embodiment.

FIG. 4 is a configuration diagram showing a main part of a conventional quiet sound device of a grand piano.

[Explanation of symbols]

1 ... Hammer shank, 2 ... Hammer, 3 ...
・ Strings, 5 ... keys, 7 ... balance pins, 9 ... hammer rail receivers, 11 ... action brackets,
13 ... Support rails, 15 ... Capstan buttons, 20 ... Damping means, 21 ... Hammer rails, 23 ... Arms, 25 ... Push-up members, 27 ...
・ Hinge block, 29 ... Rotating shaft, 30 ... Load applying means, 31 ... Reed, 33 ... Leaf spring, 35 ...
-Lever, 37 ... Block, 41 ... Hammer felt, 43 ... Artificial leather.

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[Procedure amendment]

[Submission date] February 1, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

As shown in FIGS. 1 and 2, the noise reduction means 20 supports the hammer rail 21 at both ends with arms 23 , and pushes up the lower surface of the arm 23 with a push-up member 25 to predetermined the hammer shank 1. It is configured to raise the distance. That is, the hammer rail 21 is screwed and fixed to the arm 23 at both ends, and is not fixed to the hammer rail receiver 9. The hammer rail receiver 9 is left to normally support the hammer rail 21 from below and play a role of defining the normal position of the hammer shank 1.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

The arm 23 is a hammer shank rail 1
It is rotatably fixed to the upper end of 1 via a hinge block 27. The push-up member 25 is fixed to a rotary shaft 29 arranged along the wippen rail 13.
The rotation shaft 29 is rotated 35 degrees clockwise in the drawing by operating a sound attenuation instruction member (for example, a pedal) (not shown) to push up the arm 23. Then, the arm 23 rotates upward around the hinge block 27 and pushes up the hammer shank 1. In this way, the string striking distance is shortened, the force with which the hammer 2 hits the string 3 when the key is hit is suppressed, and the sound is weakened. When the sound reduction instruction member is returned to the original position, the push-up member 25 returns to the original position, and the arm 23 and the hammer rail 21 are lowered by their own weight to the position where they come into contact with the hammer rail receiver 9. In addition, reference numeral 41 in FIG.
It is a hammer rail felt , and reference numeral 43 is artificial leather.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

As shown in FIGS. 1 and 3, the load applying means 30 corresponds to each of the shafts 31 having a semicircular cross section and extending in the width direction along the lower surface of the key 5 and 88 keys 5. Then this
A leaf spring 33 made of phosphor bronze arranged on the upper surface of the shaft 31,
And a lever 35 for rotating the shaft 31. Axis 31
Both ends are rotatably supported by a block 37 provided on the shelf plate 19. Each leaf spring 33 has a spring constant adjusted for each key in accordance with the load of the action mechanism that each key 5 normally receives. When the lever 35 is pulled toward you, the shaft 31 rotates counterclockwise in the drawing, and the leaf spring 33 supports the lower surface of the key 5. The lever 35 is also operated when operating the noise reduction means 20.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[0014] For example, in the embodiment, a weak sound means 20 and the load applying means 30 is configured as being operated separately and independently, it is more preferable to keep the like can be operated in conjunction with each other. In addition, the load applying means 30 may use a coil spring instead of a leaf spring.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of symbols] 1 ... hammer shank, 2 ... hammer, 3 ...
・ Strings 5 ・ ・ ・ Keys 7 ・ ・ ・ Balance pins 9 ・ ・ ・ Hammer rail receivers 11 ・ ・ ・ Hammer shank rails 13 13 Wipen rails 15 15 Capstan buttons 20 20 Attenuator, 21 ... Hammer rail, 23 ... Arm, 25 ... Push-up member, 27
... Hinge block, 29 ... Rotating shaft, 30 ...
Load applying means, 31 ... Shaft , 33 ... Leaf spring, 35
... Lever, 37 ... Block, 41 ... Hammer
-Rail felt , 43 ... artificial leather.

Claims (1)

[Claims] 1. A weakening means for suppressing the force of a hammer striking a string to lower the volume during a performance by raising a supporting position of a hammer when not hitting, by a predetermined distance as compared with a normal time, and said weak sound. In a sound reducing device for a grand piano, which is provided with a load applying means for ensuring a load that is no longer applied to the key by the operation of the activating means, the load applying means is provided in the lower part of the key on the front side of the rotation center of the key, and from below. A weak sound device for a grand piano, which is a means for ensuring the load by supporting a key.