JPH1124653A - Camber regulating device for piano soundboard and piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chamber regulating device for piano soundboard and a piano in which the chamber of a soundboard can be easily regulated before and after integration into the piano. SOLUTION: A camber regulating device 2 can increase the chamber by swelling about the center of a soundboard 22 by approaching upper nut 52, 54 to lower nuts 56, 58 to minimize the distance between protruding members 36, 38 and conversely, by parting far from both of the nuts 52, 54, 56, 58, each other to maximize the distance, the camber can be decreased. Therefore, the camber can be easily regulated only by regulating the positions of the nuts 52, 54, 56, 58 of a connecting member 50 regardless of before and after the integration into an upright piano 3, and various minute regulation related to the soundboard 22 can be facilitated to improve the productivity of the upright piano 3. Since the camber can be easily regulated anytime even when the upright piano 3 is being in secular change after the manufacture, the quality can be also easily kept.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting swelling of a soundboard for a piano and a piano incorporating the swelling adjusting apparatus.

[0002]

2. Description of the Related Art A piano soundboard has an important function of converting string vibration struck by a hammer into air vibration in a piano configuration. Then, in order to obtain a toned tone and volume peculiar to the piano, it is formed in a unique shape called a crown.

[0003] The swelling has a raised shape on the side of the soundboard where the piece is located, supports the force pressed by the string tension through the piece, applies tension to the soundboard, and transmits the string transmitted from the piece. Vibration is made easy to resonate. The peeling is formed by sufficiently drying the soundboard, adhering a sound stick to the back surface of the dried soundboard, leaving the soundboard in a normal state or seasoning, so that the surface rises by itself.

[0004]

However, after assembling a soundboard having such a peeling into a piano and then trying to fine-tune the peeling due to string pressure, etc., the peeling itself is already It is almost impossible to directly control the peeling. Therefore, the distance between the frame on which the strings are stretched and the strike on which the soundboard is attached, and the height of the piece are adjusted, so that the adjustment is performed in a very time-consuming manner.

[0005] If the adjustment is still not sufficient, it is necessary to adjust the peeling by changing the angle of the strike from the strike, and if this is not possible, it is necessary to replace the soundboard. There were cases. Since it is difficult to adjust the peeling of the soundboard in this way, it takes time and effort to fine-tune the parts related to the soundboard, which has been one factor in the low productivity of the piano. In addition, adjustment of swelling against aging after manufacturing requires disassembling a part of the configuration of the piano, making maintenance work difficult and requiring a great deal of time and labor to maintain quality.

SUMMARY OF THE INVENTION The present invention incorporates a piano soundboard trimming device and a piano soundboard trimming device capable of easily adjusting the soundboard shading not only before assembling into a piano but also after assembling. The purpose is to provide a piano.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a plurality of projecting members projecting from a side opposite to a piece mounting side are provided around or around a piano soundboard. It is installed near the periphery. The connecting member connects the protruding members to each other, so that the distance between the protruding members can be adjusted.

For this reason, if the distance between the projecting members is reduced by adjusting the connecting members, the sound board is pulled further on the connecting member side, so that the opposite side, that is, the piece mounting side, is further raised. The cutting can be adjusted greatly. Conversely, if the distance between the protruding members is returned or increased, the soundboard is extended by the connecting member side, so that the swelling on the opposite side, that is, the piece mounting side, is reduced, and the peeling is adjusted to be small. can do.

For this reason, the peeling can be easily adjusted only by operating the connecting member, regardless of before or after the incorporation into the piano. Since the peeling can be easily adjusted in this manner, various fine adjustments regarding the soundboard can be easily performed, and the productivity of the piano can be improved. Further, even if there is an aging change after manufacturing the piano, the peeling can be easily adjusted at any time, so that the quality can be easily maintained.

[0010] Further, in this configuration, the protruding members are further connected at a position closer to the piano soundboard than the connecting member,
A support member for maintaining the distance between the projecting members at the connection position may be provided. In this way, by adjusting the connection member, if the distance between the protruding members is reduced, the peeling of the soundboard can be reduced, contrary to the case where there is no support member, and if the distance between the protruding members is increased, Increases the size of the soundboard. However, if the soundboard is depressed by the string pressure, that is, if the so-called drop of the string occurs, the distance between the projecting members is reduced, and a strong tension is applied to the soundboard, so that the soundboard is affected by the string pressure. Can be prevented from being dented, and swelling can be recovered to some extent.

The support member may also serve as a support for a piano. Further, the protruding member may also serve as a pillar of the piano. Further, the protruding member may also serve as a driving operation, and may also serve as a pin plate. Since the swelling opposes the string pressure, the connecting member connects the projecting members to each other in a direction substantially along the direction in which the strings are stretched. Preferred for adjustment.

The connecting member has a screwing mechanism between the connecting member and the projecting member, and the distance between the projecting members can be adjusted by rotating the screwing mechanism. Further, the connecting member itself is provided with a screwing mechanism having a relationship between a bolt and a nut, and by rotating a member corresponding to the bolt or the nut, the distance between the projecting members can be adjusted. Can be.

The connecting member can be mainly constituted by, for example, a rigid rod-shaped member or a wire. The shape of the connecting member is not only a linear shape but also a central member and a radial member extending radially from the central member. May be connected to the protruding member.

Also in this case, the radiating member can be mainly constituted by a rigid rod-shaped member or a wire. By incorporating any of the above piano soundboard trimming devices into a piano, it is possible to adjust the soundboard stripping at any time, and not only to improve the quality and efficiency at the time of manufacturing, but also to maintain it over time. Is also easy and can contribute to quality maintenance.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment 1] An upright piano 3 incorporating a piano soundboard swelling adjusting device 2 is shown in a longitudinal sectional view of FIG. 1 and a rear view of FIG. 2 (reduced from the longitudinal sectional view). .

The frame 4 mainly composed of a cast body made of an alloy such as iron or aluminum is provided with a tuning pin 10 on the periphery thereof and a hitch pin 12 facing the tuning pin 10.
A string 30 is stretched between the and the hitch pin 12.
A pin plate 14 is fixed to the rear side of the upper portion of the frame 4 and holds the tuning pin 10 so as not to be loosened.

A sound board 22 is disposed on the back side of the frame 4, and a piece 32 is fixed to the front side of the sound board 22 by screws, and transmits the vibration of the string 30 to the sound board 22. The rectangular soundboard 22 has a hammering 34 attached to the periphery thereof. Of the striking parts 34, the members extending on the upper side and the lower side are the protruding members 36 and 38, and protrude greatly from the back surface of the soundboard 22 as compared with the members extending on the left and right sides. I have.

Prop columns 44 are arranged on the left and right sides of the back of the upright piano 3 and are firmly joined to the lower projecting member 38 and loosely joined to the upper projecting member 38. In addition, the projecting members 36 and 38 also serve as a conventional strut and driving. Between the projecting members 36 and 38, the soundboard 2
A plurality of through-holes 46 and 48 (here, four each in the protruding members 36 and 38) are provided vertically away from the position 2. Of the through holes 46, 48, the through holes 46, 4 existing at corresponding positions in the up-down direction.
8, a rigid connecting member 50 made of a metal rod (here, an iron alloy) penetrates. Through holes 46, 48
A part of the connection member 50 penetrating through and in the vicinity thereof,
A screw groove is cut, and two nuts 52, 54, 56, 58 are screwed into the screw groove portions 50a, 50b, respectively, to form a screwing mechanism, and the projecting members 36, 38 are connected to the nuts 52,5.
The connecting member 50 is fixed by sandwiching the connecting members 50, 56, 58.

The protruding members 36 and 38, the connecting member 50, and the nuts 52, 54, 56 and 58 constitute the burring adjustment device 2. Note that the soundboard 22 and the hollowing adjustment device 2
FIG. 3 shows a vertical cross-sectional view taken out only of the above. The slimming adjusting device 2 configured as described above includes the nuts 52, 54, 56,
By changing the position of 58, two projecting members 36,
The distance between 38 can be changed.

For example, when the string pressure applied from the string 30 is too small, the gap between the upper nuts 52, 54 and the lower nuts 56, 58 is brought closer as shown by the arrow A in the drawing, and the projecting members 36, When the distance between the soundboards 38 is reduced, almost the center of the soundboard 22 in the vertical direction rises in the direction of the arrow X in the drawing, and the swelling can be increased.

Conversely, if the string pressure is too high, the gap between the upper nuts 52, 54 and the lower nuts 56, 58
As shown by the arrow B in the figure, the projection members 36 and 38 are moved away from each other.
When the distance between them is increased, almost the center of the soundboard 22 in the up-down direction returns to the direction of the arrow Y in the drawing, so that peeling can be reduced. The adjustment of the swelling can be adjusted in a state in which it is incorporated in the upright piano 3 or in a state before being incorporated in the upright piano 3, which has only the configuration shown in FIG.

For this reason, the nuts 52, 5 of the connecting member 50 are irrespective of before and after being assembled into the upright piano 3.
The peeling can be easily adjusted only by adjusting the positions of 4, 56 and 58. Since the peeling can be easily adjusted in this manner, various fine adjustments regarding the soundboard 22 can be easily performed, and the productivity of the upright piano 3 can be improved.
Further, even if the upright piano 3 has been changed over time after production, the peeling can be easily adjusted at any time, so that the quality can be easily maintained.

[Embodiment 2] The peeling adjusting device 61 of the upright piano 60 shown in FIG.
Instead of the connecting member 50 arranged in parallel between the metal rings 6 and 38, a metal ring 62 is arranged in the center,
The thread groove portions 63a of the two connecting members 63 each having one end attached to the upper projecting member 36 penetrate through the upper through hole of the second. The metal ring 62 is sandwiched between nuts 65 and 66 screwed into the screw groove 63a. Also,
In the lower through-hole of the metal ring 62, thread groove portions 64 a of two connecting members 64 each having one end attached to the lower projecting member 38 penetrate. The metal ring 62 is sandwiched between nuts 67 and 68 screwed into the thread groove 64a. For this reason, the excavation adjusting device 61 moves the metal ring 62 as the central member from the connecting member 6 as the radiating member.
3, 64 extend radially and have a substantially X-shape. The connection members 63 and 64 are made of rigid metal rods.

The swelling adjusting device 61 constructed as described above.
By changing the positions of the nuts 65, 66, 67, 68, the distance between the two projecting members 36, 38 in an oblique direction (diagonal direction of the soundboard 22) can be changed. For example, if the string pressure applied from the string 30 is too small, the positions of the nuts 65, 66, 67, 68 are adjusted, and the projecting members 36, 38 are drawn toward the metal ring 62, whereby the projecting members When the distance between 36 and 38 is reduced, the center of the soundboard 22 rises, and the swelling can be increased.

Conversely, if the string pressure is too large, the positions of the nuts 65, 66, 67, 68 are adjusted to
By increasing the distance between the protruding members 36 and 38 by separating the metal members 6 and 38 from the metal ring 62, the swelling at the center of the soundboard 22 is reduced and the peeling can be reduced. The adjustment of the swelling can be adjusted in a state where the swelling is incorporated in the upright piano 60 or before the swelling is incorporated in the upright piano 60.

For this reason, the peeling can be easily adjusted only by adjusting the positions of the nuts 65, 66, 67, 68 of the connecting members 63, 64 regardless of before and after the incorporation into the upright piano 60. As in the case of the upright piano 6, the fine adjustment of the soundboard 22 becomes easy.
0 productivity can be improved. Further, even if the upright piano 60 has been changed over time after production, the peeling can be easily adjusted at any time, so that the quality can be easily maintained.

Further, the strings 30 are arranged so as to cross substantially in an X-shape in the low range and the middle and high range, but the connecting members 63, 64 extend in the direction of the strings 30, and the soundboard 22. Can be pulled obliquely toward the central metal ring 62 or conversely separated. From this, the peeling adjusting device 61 of the present embodiment is adapted to the direction of the string 30.
More effective adjustment of the peeling becomes possible.

[Embodiment 3] Fig. 5 shows an example in which the slimming adjusting device of the present invention is applied to a grand piano. FIG.
Prop part 70, 72, 74, 76, 7 of grand piano
8,80,82 (actually, some are 70,
These are referred to as the back frame 80 and the middle frame 82. FIG. 7 shows only the hollowing adjustment device 85 viewed from the bottom. Outside the loading 70,
As shown in FIG. 6, a side plate 71 is provided, and a soundboard 94 is attached to an upper portion of the stack 70.

The four columns 72, 74, 76, 78 support between the stack 70 and the back frame 80. Along the lower side of these four columns 72, 74, 76, 78, the connecting members 8
4 and 86 are disposed, and opposite ends of the connecting members 84 and 86 are fixed to the stacking 70 or the back frame 80 by the fixing brackets 88 and
90 fixed. The connecting members 84 and 86 are made of rigid metal rods.

The opposite ends of the connecting members 84 and 86 form screw grooves 84a and 86a. The screw groove portion 84a and the screw groove portion 86a are reversely screwed to each other, and both screw groove portions 84a and 86a are
To form a screwing mechanism. Therefore, the rotation of the turnbuckle 92 causes the fixing brackets 88, 9 to rotate.
Zero can be pulled in and out.

As shown in FIG. 6, since the fixing brackets 88 and 90 are attached to the lower part of the stack 70 or the back frame 80, the turnbuckle 92 is rotated to connect the connecting members 8 to each other.
When the connecting member 4 and the connecting member 86 are brought close to each other, the lower part of the stack 70 moves as indicated by the arrow A in the figure. As a result, the loading 70
The center of the soundboard 94 attached to the upper part of the slab rises further as shown by the arrow X in the figure, and the peeling increases. The turnbuckle 92 is reversed to connect the connection members 84 and 86
Is released, the lower part of the stack 70 moves as shown by the arrow B in the figure. As a result, the center of the soundboard 94 attached to the upper part of the stack 70 sinks as shown by the arrow Y in the drawing, and the peeling is reduced.

Since the present embodiment is configured as described above, the stripping of the sound board 94 can be adjusted at any time, as in the first embodiment, and the productivity of the grand piano can be improved. Since the peeling can be easily adjusted at any time with respect to aging after the manufacture of the grand piano, the quality can be easily maintained.

[Embodiment 4] FIG. 7 shows an apparatus 100 for adjusting the peeling of a grand piano as viewed from the bottom.
Instead of being provided along 2, 74, 76, 78, a metal ring 102 is disposed at the center, and 4
The threaded portion 103a provided at one end of each of the four connection members 103 is made to pass through the two through holes, and two nuts 10
6, 108 are screwed together to sandwich the metal ring 102. The other end of each connecting member 103 is fixed to a fixing bracket 104 attached to the stack 70 or the back frame 80. The connection member 103 is made of a rigid metal rod.

For this reason, the swelling adjusting device 100 includes a metal ring 102 as a center member, as in the example shown in FIG.
The connecting member 103 as a radiating member extends radially from the radiating member and has a substantially X-shape. By changing the positions of the nuts 106 and 108, the slimming adjusting device 100 configured as described above can change the diagonal distance between the stack 70 corresponding to the protruding member and the inner frame 80. .

For example, when the string pressure applied from the strings is too small, the positions of the nuts 106 and 108 are adjusted to
The lower part of the loading 70 and the lower part of the back frame 80 are
To the lower part of the loading 70 and the back frame 8
When the distance between the sound board 94 and the lower part of the sound board 94 is reduced, the center of the sound board 94 rises, and the peeling can be increased.

Conversely, if the string pressure is too large, the positions of the nuts 106 and 108 are adjusted to separate the lower part of the stack 70 and the lower part of the backing frame 80 from the metal ring 102, thereby making the stack 70 When the distance between the lower part of the rear panel 80 and the lower part of the back frame 80 is increased, the swelling at the center of the sound board 94 is reduced, and the swelling can be reduced. The adjustment of the swelling can be adjusted in a state of being incorporated in a grand piano or before being incorporated in a grand piano.

For this reason, the nuts 106, 10 of the connecting member 103 may be used before or after being assembled into the grand piano.
The peeling can be easily adjusted only by adjusting the position of 8, and similarly to the third embodiment, various fine adjustments regarding the sound board 94 become easy, and the productivity of the grand piano can be improved. Furthermore, even if the grand piano has changed over time after manufacture, the peeling can be easily adjusted at any time, so that the quality can be easily maintained.

Furthermore, since the strings are arranged so as to cross in a substantially X-shape between the low-frequency range and the mid-high frequency range, the peeling adjusting device 100 according to the present embodiment obliquely extends around the soundboard 94 in the oblique direction. Since it can be pulled in the direction of the central metal ring 102 and can be separated in the opposite direction, the shaping adapted to the direction of the chord is formed, so that more effective shaving adjustment is possible.

[Fifth Embodiment] A slimming adjusting device 122 shown in FIG. 8 fixes a soundboard 128 to a pin plate 124 and a hitch pin rail 126, and uses a soundboard 128 without using a frame.
Tuning pin 13 pierced through pin plate 124 from the side
A configuration is shown in which a string 134 is stretched between 0 and a hitch pin 132 penetrating the hitch pin rail 126 from the soundboard 128 side. This configuration is used for a simple upright piano.

Pin plate 124 and hitch pin rail 12
6, on the inner side surfaces 124a and 126a, projecting brackets 136 as projecting members projecting in the opposite direction to the soundboard 128.
138 are fixed. The protrusions 136 and 138
A through hole is provided at the tip of the connecting member 150 formed of a rigid metal rod.
50a and 150b penetrate, each having two nuts 15
2, 154 are fixed by sandwiching the protruding metal fittings 136, 138.

The swelling adjusting device 12 thus configured
By changing the positions of the nuts 152 and 154, the distance between the two protrusions 136 and 138 can be changed. For example, when the string pressure applied from the string 134 is too small, the distance between the upper nuts 152 and 154 and the lower nuts 152 and 154 is brought closer as shown by the arrow A in the drawing, and the distance between the protrusions 136 and 138 is increased. When the distance is reduced, almost the center of the soundboard 128 in the vertical direction rises in the direction of the arrow X in the drawing, and the swelling can be increased.

On the other hand, if the string pressure is too large, the upper nuts 152 and 154 are separated from the lower nuts 152 and 154 as shown by arrow B in FIG.
When the distance between 36 and 138 is increased, almost the center of the soundboard 128 in the vertical direction is lowered in the direction of the arrow Y in the drawing, so that peeling can be reduced. The adjustment of the swelling can be adjusted in a state of being incorporated in the upright piano or before being incorporated in the upright piano. Therefore, an effect similar to that of the first embodiment is obtained.

[Sixth Embodiment] The slimming adjusting device 202 shown in FIG. 9 is different from the slimming adjusting device 2 shown in FIG.
Further, a different point is that a metal rigid support member 204 for connecting the protruding members 36 and 38 to each other at a position closer to the soundboard 22 than the connecting member 50 is provided. This support member 204
Functions to maintain the distance between the projecting members 36 and 38 at the connection position.

When the support member 204 is provided in this manner, by adjusting the nuts 52, 54, 56, 58 of the connection member 50, the distance between the projecting members 36, 38 is reduced as shown by the arrow A in the drawing. Plays a role of a fulcrum, and the projecting members 36 and 38 on the soundboard 22 side are extended in distance, as shown by the arrow Y in the drawing, in the direction to reduce the peeling, as opposed to the case where the support member 204 is not provided. Moving.
However, in a case where the soundboard 22 is depressed due to the string pressure, that is, a so-called string descent occurs, the distance between the protruding members 36 and 38 is reduced, and a strong tension is applied to the soundboard 22.
Since the soundboard 22 can be prevented from being depressed by the string pressure, the peeling can be recovered to some extent.

In this embodiment, the support member 204
Also serves as a column firmly fixed to the protruding members 36, 38. [Others] In the first and second embodiments, the distance between the projecting members is adjusted by the nut. However, a method using a turnbuckle as described in the third embodiment may be used. The same applies to the fourth, fifth, and sixth embodiments, and a turnbuckle may be used.

Conversely, instead of the turnbuckle in the third embodiment, a method using nuts as in the first, second, fourth, fifth and sixth embodiments may be used. Although a metal bar is used as the connection member, a wire may be used instead of the metal bar.

In the fifth embodiment, the sound board 128 is directly connected to the pin board 124 and the hitch pin rail 126. However, the periphery of the sound board 128 is formed thick, and the sound board 128 is attached to the pin board 124 and the hitch pin rail 126. 126 may also be used. When the thick projecting members 36, 38 are attached to the soundboard as in the first, second, and sixth embodiments, the pin plates 124 and the hitch pin rail 12 are attached to the projecting members 36, 38.
6 may also be used.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an upright piano in which a piano soundboard peeling adjusting device according to a first embodiment is incorporated.

FIG. 2 is a rear view thereof.

FIG. 3 is a vertical cross-sectional view showing a piano soundboard swelling adjusting device according to the first embodiment;

FIG. 4 is a rear view of an upright piano according to a second embodiment in which a piano soundboard swelling adjusting device is incorporated.

FIG. 5 is an explanatory diagram of a configuration of a grand piano incorporating a piano soundboard peeling adjusting device according to a third embodiment.

FIG. 6 is a detailed explanatory diagram thereof.

FIG. 7 is an explanatory diagram of a configuration of a grand piano incorporating a piano soundboard peeling adjusting device according to a fourth embodiment.

FIG. 8 is a vertical sectional view showing a piano soundboard swelling adjusting device according to a fifth embodiment.

FIG. 9 is a longitudinal sectional view showing a piano soundboard swelling adjusting device according to a sixth embodiment.

[Explanation of symbols]

2 ... Pulling adjustment device 3 ... Upright piano 4 ... Frame 10 ... Tuning pin 12 ... Hitch pin 14 ... Pin plate 22 ... Sound board 30 ... String 32 ... Piece 34 ... Striking 36,38 ... Protrusion member 44 ... Prop 46, 48 ... through-hole 50 ... connecting member 50a, 50b ... screw groove 52, 54, 56, 58
... Nut 60 ... Upright piano 61 ... Piece adjustment device 62 ... Metal ring 63,64 ... Connecting member 63a
... Screw groove portion 64a ... Screw groove portion 65,66,67,68 ... Nut 70 ... Stowing 71 ... Side plate 72,74,76,78
… Prop 80… Back frame 82… Middle frame 84, 86… Connection member 84 a, 86 a… Screw groove 85… Pulling adjustment device 88, 90… Fixing fixture 92… Turnbuckle 9
4 ... Sound board 100 ... Pulling adjustment device 102 ... Metal ring 103
... Connecting member 103a ... Screw groove 104 ... Fixing bracket 106,10
Reference numeral 8: Nut 122: Exfoliation adjusting device 124: Pin plate 124a, 126a: Inner surface 126: Hitch pin rail 128: Soundboard 130: Tuning pin 132: Hitch pin 134: String 136, 138: Protrusion fitting 150: Connection member 150a, 150b ... Screw groove portions 152,154 ... Nut 202 ... Piece adjustment device 204 ... Support member

Claims (15)

[Claims] 1. A plurality of projecting members attached to the periphery of a piano soundboard or in the vicinity of the periphery and projecting to a side opposite to a piece attaching side, connecting the projecting members, and adjusting a distance between the projecting members. And a connection member capable of adjusting the distance between the protruding members by the connection member, whereby the stripping of the piano soundboard can be adjusted. 2. A plurality of projecting members which are attached to the periphery of a piano soundboard or in the vicinity of the periphery and project to the side opposite to the piece attaching side, connecting the projecting members to each other, and connecting the projecting members at a connection position. And a support member that connects the protruding members to each other at a position closer to the piano soundboard than the connecting member, and maintains a distance between the protruding members at the connection position. A piano soundboard stripping adjusting device, wherein the stripping of a piano soundboard can be adjusted by adjusting the distance between the projecting members at a connection position by the connection member. 3. An apparatus according to claim 2, wherein said support member also serves as a column of a piano. 4. The apparatus according to claim 1, wherein said projecting member also serves as a column of the piano. 5. An apparatus according to claim 1, wherein said projecting member also serves as striking. 6. An apparatus according to claim 1, wherein said projecting member also serves as a pin plate. 7. The piano sound according to claim 1, wherein said connecting member connects said projecting members in a direction substantially along a direction in which the strings are stretched. Board peeling adjustment device. 8. The connecting member has a screwing mechanism between the connecting member and the projecting member, and the distance between the projecting members can be adjusted by rotating the screwing mechanism. 1
8. The apparatus for adjusting swelling of a piano soundboard according to any one of claims 7 to 7. 9. The connecting member includes a screwing mechanism having a relationship between a bolt and a nut, and a distance between the projecting members can be adjusted by rotating a member corresponding to the bolt or the nut. 2. The method according to claim 1, wherein
8. The apparatus for adjusting swelling of a piano soundboard according to any one of claims 7 to 7. 10. The connecting member is a rigid rod-shaped member.
10. The piano soundboard stripping adjusting device according to claim 1, wherein the device is mainly configured. 11. An apparatus for adjusting the peeling of a soundboard for a piano according to claim 1, wherein said connecting member is mainly constituted by a wire. 12. The connecting member comprises a central member and a radiating member extending radially from the central member, and the radiating member is connected to a plurality of protruding members mounted on or near the periphery of the piano soundboard. 10. The apparatus for adjusting the peeling of a soundboard for a piano according to any one of claims 1 to 9, wherein: 13. The radiating member is a rigid rod-shaped member,
13. The apparatus according to claim 12, wherein the apparatus is mainly configured. 14. An apparatus according to claim 12, wherein said radiating member is mainly constituted by a wire. 15. A piano comprising the piano soundboard swelling adjusting device according to any one of claims 1 to 14.