JPH0962253A - Grand piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an assembly process simple and efficient, and enhance assembly accuracy by providing a frame to which a pin plate is directly fitted and on which strings can be stretched via the pin plate, and providing a shelf board which is directly fitted to the frame and on which a keyboard and an action are mounted. SOLUTION: This grand piano is assembled by using a frame F as a base, and by directly fitting strings, a sound board 8, a shelf board 10, and side boards 10 thereto. The frame F has a flat shape coinciding with the grand piano, and is integrally casted. The strings can be directly stretched on the casted frame F, and the sounding board 8, the shelf board 11. and the side boards 10 are also directly fitted to the frame F. Accordingly, the fitting accuracy of respective components is enhanced so that particularly dislocation among three components, the strings, and the keyboard and the action which are to be mounted on the shelf board 11 is reduced, and adjusting work is also facilitated.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a grand piano.

[0002]

2. Description of the Related Art FIG. 10 is a side sectional view of a conventional grand piano, and FIG. 11 is an assembling process diagram thereof. Assembling of a ground is generally performed by the following procedure. First, the pillar assembly 4 is assembled from the wooden pillar 1, the stack 2, the back frame 3, and the like. After mounting the batting 5 on the upper surface of the strut assembly 4, the sound board 8 to which the sound bar 6 and the pieces 7 (long piece 7a and short piece 7b) are attached, and the pin board 9 are attached. Next, after fixing the side plate 10 to the outer periphery of the support post assembly 4, the shelf plate 11 is fixed to the lower surface. Further, the frame 12 is placed and fixed on the column assembly 4 while being placed on the pin plate 9. After the tuning pin 13 is embedded in the pin plate 9 via the frame 12, the string S is stretched between the hitch pin 14 and the piece pin 7c of the piece 7 as a relay point. The keyboard 16 is placed on the shelf board 11 via the reed 15, the action 18 is attached via the action bracket 17, and the damper 19 is further attached. Tuning (adjusting the functions of the keyboard and action to perform proper string striking) and tuning. The case member 24 other than the side plate 10, such as the leg holder 20, the leg 21, the rear of the large roof 22, the front of the large roof 23, etc., is attached, and after the sound adjustment finishing and inspection, the assembly is completed.

[0003]

However, in the above-mentioned conventional grand piano, with the pillar assembly 4 as a base,
Since a number of parts such as a soundboard 8, a pin board 9, a frame 10, a string S, a shelf board 11, a keyboard 16 and an action 18 are sequentially attached thereto, warp and twist are generated in the pillar assembly 4 made of wood. Since it is likely to occur and manufacturing errors and mounting errors of the components are accumulated, the positional relationship between the components is likely to shift, and there is a drawback that it takes a lot of time to adjust them.

Particularly, focusing on the positional relationship among the string S, the keyboard 16 and the action 18, which greatly influences the quality of the piano, the string S is placed on the pin plate 9 attached to the strut assembly 4 and the frame 12 is mounted on the frame 12. While the keyboard 16 and the action 18 are attached via the shelf board 11 fixed to the strut assembly 4, the positional relationship between the three is likely to be greatly displaced immediately after these are attached. . Adjustment of this positional relationship is usually performed at the top and bottom of the foot (vertical distance from the upper surface of the shelf 11 to the striking point by the hammer 18a of the action 18) and before and after the foot (before and after the front of the shelf 11 to the above striking point). Distance) is used as a reference.

However, in the conventional grand piano, since the shelf plate 11 is already fixed to the strut assembly 4 when the string is stretched, the shelf plate 11 may be, for example, a large size in order to adjust the upper and lower parts of the frame and the front and rear of the frame. It is necessary to carry out a shaving process using a shelf board shaving machine, which is a major factor in increasing the assembly cost. Also, the frame 12 is the pin plate 9
Since it is placed on top, the thickness of the pin plate 9 directly affects the installation height of the string S, and thus the upper and lower parts of the space directly, and the pin plate 9 must be manufactured with extremely high thickness accuracy. .

[0006] In the conventional grand piano, the tuning pin 1 is used only after the frame 12 is attached.
3 cannot be buried, and if this burying process is not completed, it will not be possible to proceed to subsequent processes such as the stringing process, so that the troublesome burying process of the tuning pin 13 causes a stagnation of the production line, and eventually the production. This leads to a decrease in efficiency.

The present invention has been made in order to solve such problems, and an object thereof is to provide a grand piano capable of simplifying and assembling the assembling process and improving the assembling accuracy. There is.

[0008]

In order to achieve the above object, a grand piano of the present invention has a metal frame to which a pin plate is directly attached, and a string can be stretched through the pin plate. And a shelf plate for mounting a keyboard and an action, which is directly attached to the frame.

According to this structure, the strings can be stretched on the frame directly through the pin plate attached to the frame,
Since the shelf plate is directly attached to the frame and the keyboard and the action are placed on the shelf plate, the mounting precision of each of these parts is improved. In this case, since the frame is made of metal and the manufacturing dimensional accuracy and dimensional stability are high, the mounting accuracy of each component is further improved, and the positional relationship between the string, keyboard, and action is extremely small. Therefore, it becomes easy to adjust the vertical position and the front and rear of the frame. Further, since the pin plate is directly attached to the frame, the thickness of the pin plate has no influence on the top and bottom of the frame, and the thickness tolerance is relaxed. Further, since the shelves can be attached after the strings are individually stretched on the frame, it is not necessary to carry out a shaving process with a large shaving machine for the shelves.

Further, before attaching other parts to the frame, the steps up to the string tension, including the step of burying the tuning pin in the pin plate attached to the frame, can be completed in advance. The piano can be assembled efficiently without causing a production line stagnation.

In this case, it is preferable to further include a side plate directly attached to the frame. According to this configuration, the side plate is also directly attached to the frame. As a result, it is possible to omit the conventional strut assembly that plays a role of attaching the soundboard, the shelf board, and the side board, and the number of parts can be reduced and the assembling process can be simplified accordingly.

In these cases, it is preferable to further include shelf plate positioning means for positioning the shelf plate at predetermined positions in the front-rear direction and the left-right direction with respect to the frame. According to this configuration, the shelf plate positioning unit accurately positions the shelf plate at a predetermined position in the horizontal plane with respect to the frame, and the displacement such as the front and rear of the rim is further reduced.

In this case, the shelf positioning means has a plurality of frame first reference holes and shelf reference holes formed at predetermined positions of the frame and the shelf corresponding to each other, and the frame first reference aligned with each other. And a shelf positioning pin that is passed between the hole and the shelf reference hole. According to this structure, the shelf plate is accurately positioned with respect to the frame by the simple structure of the reference holes and the shelf plate positioning pins formed in the frame and the shelf plate, respectively.

Further, it is preferable that the apparatus further comprises shelf height adjusting means for adjusting the height of the shelf with respect to the frame. According to this configuration, the height of the shelf can be adjusted by adjusting the height of the shelf with respect to the frame by the height adjusting means for the shelf.

In these cases, it is preferable to further include a soundboard directly attached to the frame. In this configuration, the soundboard is also directly attached to the frame, which improves the accuracy of attachment.

In this case, a skirt portion is provided so as to hang down on the peripheral portion of the frame, the soundboard is attached to the frame in a state of being accommodated in the skirt portion, and the side plates are provided along the outer surface of the skirt portion. It is preferably attached to. According to this configuration, the soundboard and the side plate are
It is possible to efficiently attach the skirt as a common attachment.

In these cases, it is preferable to further include soundboard positioning means for positioning the soundboard at predetermined positions in the front-rear direction and the left-right direction with respect to the frame. With this configuration, the soundboard positioning means accurately positions the soundboard with respect to the frame at a predetermined position within the horizontal plane.

In this case, the soundboard positioning means has a plurality of frame second reference holes and soundboard reference holes formed at predetermined positions corresponding to each other on the frame and soundboard, and the frame second reference aligned with each other. And a soundboard positioning pin that is passed between the hole and the soundboard reference hole. According to this structure, the soundboard is accurately positioned with respect to the frame by the simple structure of the reference holes and the soundboard positioning pins formed in the frame and the soundboard, respectively.

Further, it is preferable to further include soundboard height adjusting means for adjusting the height of the soundboard with respect to the frame. According to this configuration, the sound pressure can be easily adjusted by adjusting the height of the sound board with respect to the frame by the sound board height adjusting means.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows main assembling steps of a grand piano to which the present invention is applied. As shown in the figure, in this grand piano, the strut assembly that has been used conventionally is omitted, and the strings S, the soundboard 8, the shelf board 11, and the side board 10 are directly attached to the frame F as a base. It is assembled by mounting. In the following description, common reference numerals will be used for those components that are common to the already described components.

As shown in FIG. 2, the frame F has a planar shape that matches a grand piano, and is made of an integrally molded casting. Shelf boards 1 on the left and right of the front of frame F
Shelf plate mounting portions 25, 25 for mounting 1 are provided, and each shelf plate mounting portion 25 is provided with a front mounting portion 25a protruding forward from the front end of the frame F and a space behind the front mounting portion 25a. The rear mounting portion 25b is provided and projects downward. Front and rear mounting parts 25a, 25b
Have their lower surfaces flush with each other, and
And a first reference hole (frame first reference hole) 26 for positioning the shelf 11 with respect to the frame F is formed at a predetermined position on the lower surface of each front attachment portion 25a. .

A skirt portion 27 is formed on the peripheral portion of the frame F so as to be located behind the shelf plate attaching portion 25 and hang down. The skirt portion 27 also serves as a mounting portion for the soundboard 8 and the side plate 10. The soundboard 8 is accommodated in the skirt portion 27 and the side plate 10 is mounted along the outer surface of the skirt portion 27. Has become. Further, the frame F is formed with a plurality of second reference holes (frame second reference holes) 28 for positioning the soundboard 11 with respect to the frame F at a plurality of predetermined positions along the skirt portion 27. ing.

A pin plate accommodating portion 29 is provided in the front portion of the frame F, and the pin plate 9 is accommodated and fixed in the pin plate accommodating portion 29. A large number of tuning pins 13 are embedded in the pin plate 9, and the strings S are stretched between the tuning pins 13 and the hitch pins 14 embedded in the rear portion of the frame F. In addition, in this embodiment, the pin plate 9 is the low-pitched-range pin plate 9a and the mid-high-pitched-range pin plate 9b.
Is divided into With such a two-divided configuration of the pin plate 9, it is possible to omit the grinding process for forming the notch required near the boundary between the low tone range and the middle and high tone range when a single plate is used, The yield can be improved by making the mill ends available.

The soundboard 8 has a frame F as shown in FIG.
The piece 7 (long piece 7a and short piece 7b) is bonded to the upper surface and a plurality of sound sticks (not shown) are bonded to the lower surface. The lower surface front end portion (frame portion) of the soundboard 8 is integrally provided with a lower surface driving 30 and an upper surface driving portion 31 is integrally provided at a peripheral edge portion excluding the upper end of the upper surface. The lower surface of the upper surface driving 31 is provided with an inclination in order to smoothly apply the plucking to the soundboard 8 (see (c) in the figure), and the upper surface corresponds to the second reference hole 28 of the frame F. A plurality of soundboard reference holes 32 are formed at predetermined positions.

The soundboard 8 thus constructed is housed in the skirt portion 27 of the frame F, the soundboard reference holes 32 are aligned with the corresponding second reference holes 28 of the frame F, and both reference holes 28 are arranged. , 32 in a state where the soundboard positioning pin 33 (see FIG. 2B) is inserted between the soundboard positioning pins 33, 32, and is fixed to the frame F by the fixing screw 34 through the upper face driving 31. With such a simple configuration of the reference holes 28 and 32 and the soundboard positioning pin 33, the soundboard 8 can be accurately positioned with respect to the frame F at predetermined positions in the front-rear direction and the left-right direction.

A soundboard height adjusting screw (soundboard height adjusting means) 35 is also provided at the tightening portion of the fixing screw 34. As shown in detail in FIG. 4, the soundboard height adjusting screw 35 is screwed into the upper surface turning 31 so as to be able to move back and forth, and in the soundboard 8, the head of the soundboard height adjusting screw 35 is the lower surface of the frame F. The fixing screws 34, 3 on both sides of the fixing screw
Fixed at 4. That is, the soundboard height adjusting screw 35 functions as a spacer, and the soundboard height adjusting screw 3
By rotating 5 to advance and retreat, and adjusting the protruding length thereof, the height of the soundboard 8 with respect to the frame F can be adjusted, thereby achieving a desired turning height and stripping of the soundboard 8. A desired piece pressure can be obtained. At the position facing the soundboard height adjusting screw 35 of the frame F,
An insertion hole 36 is formed penetrating in the vertical direction, and even after the soundboard 8 is attached to the frame F, a driver or the like is inserted through the insertion hole 36 and the soundboard height adjusting screw 35 is operated to It is possible to adjust the height of the plate 8.

After attaching the soundboard 8 to the frame F in this manner, the strings S already stretched on the frame F are
It is hooked on a piece pin (not shown in FIG. 3) of the piece 7.

The shelf plate 11 is made of wood, and after the soundboard 8 is attached to the frame F, it is attached to the lower surface of the shelf plate attaching portion 25 of the frame F with fixing screws 37 as shown in FIG. Similarly to the case of attaching the soundboard 8, the shelf 11 is attached by the first reference hole 26 and the shelf reference hole 38 of the frame F and the shelf positioning pin 39.
Is accurately positioned in the front-rear direction and the left-right direction with respect to the frame F, and the height of the shelf board 11 with respect to the frame F is adjusted by the shelf board height adjusting screw 40 configured similarly to the soundboard height adjusting screw 35. Is adjusted. As a result, desired front and rear frames and upper and lower frames can be accurately obtained. Incidentally, reference numeral 41 in the figure is an insertion hole formed in the shelf board 11 for inserting a driver.
In this way, since the shelf board 11 is mounted on the frame F after the soundboard 8 and the strings S are mounted on the frame F, it is not necessary to carry out a shaving process on the shelf board 11 by a large shaving machine or the like. The keyboard 16 and the action 18 can be placed on the plate 11 and the adjustment can be performed immediately.

The shelf 11 has a soundboard connecting fitting 42. The soundboard connecting fitting 42 and a member corresponding to the intermediate frame integrally provided on the lower surface driving 30 of the soundboard 8. The soundboard 8 is also connected to the soundboard 8 by screwing it to the soundboard 43, and supports the soundboard 8 from below (see FIG. 3 (b)). The soundboard connecting fitting 42 is arranged in the front-back direction with respect to the shelf board 11 (see FIG.
It is attached slidably in the direction of arrow B in (b), and by finely adjusting this slide, the dimensional error and the installation error of the middle frame equivalent member 43 are absorbed, and the soundboard 8 and the shelf 11 are attached. The connection can be done smoothly. In addition,
In order to further reduce the mounting error of the shelf board 11, it may be made of a metal plate excellent in manufacturing dimensional accuracy and dimensional stability, for example, an aluminum plate. A damper unit 44 is attached to the shelf board 11 in advance. this is,
This is for facilitating the assembling of the shelf board 11 after the mounting, and further advancing this viewpoint, the keyboard 16 and the action 18 are also put ahead of the shelf board 11 to promote unitization and facilitate the assembling. You may

The side plate 10 is made of a thin plate made of wood or a flexible resin. The side plate 10 is formed into the outer shape of the grand piano by applying a coating to a flat plate in advance and then mounting the fixing rails 45 shown in FIG. 6 above and below the side plate 10 and bending the side plate 10. . Then, as shown in FIG. 7A, the side plate 10 is formed as a side plate unit in which the keyboard lid 46 is rotatably attached in advance and the front frame 47 is fixed, and then, as shown in FIG. The fixing screw 48 is screwed to the outer surface of the skirt portion 27. In order to firmly fix the screw with the fixing screw 48, as shown in FIG.
Wedge 49 is also used between 0.

The side plate 10 can be attached with the shelf plate 11 as a reference in both the front-back direction and the vertical direction, for example,
As shown in FIG. 7A, the shelf board 11 in the front-back direction is used.
Is performed with reference to the front surface of the shelf board 11 in the vertical direction. Further, as shown in FIG. 2B, it is preferable to arrange the side plate 10 so as to cover both outer side surfaces of the shelf plate 11. This makes it easier to clean the appearance of the piano and makes the side plate for the shelf plate 10 easier. 1
The vertical adjustment of 1 can be easily performed.

After the side plate 10 is attached to the frame F as described above, the leg holder 50 is attached to support the weight of the piano. As shown in FIG. 9, the leg holder 50 integrally has a fixing stay 51 extending to the skirt portion 27 of the frame F, and is screwed to the side plate 10 via the fixing stay 51. Thereafter, another case member 24 is attached and the assembly of the gland is completed.

As described above, according to this embodiment, the strings S can be stretched directly on the cast frame F, and the soundboard 8, the shelves 11 and the side plates 10 can be directly attached to the frame F. The mounting precision of each of these parts is improved, and as a result, the positional difference between the string S and the keyboard 16 and the action 18 placed on the shelf 11 is greatly reduced. It is very easy to adjust the top and bottom of the frame and the front and rear of the frame.

In this case, the shelf 11 is fixed to the frame F by a simple structure of the first reference hole 26 and the shelf reference hole 38 of the frame F and the shelf positioning pin 39 which is inserted between the reference holes 26 and 38. Can be accurately positioned in the front-back and left-right directions with respect to the shelf height adjustment screw 3
The height of the shelf plate 11 with respect to the frame F can be adjusted by 8, and thereby the desired frame front and rear and frame upper and lower can be easily obtained with high precision. Similarly, with respect to the soundboard 8, the soundboard 8 can be accurately positioned with respect to the frame F by the second reference hole 28 and the soundboard reference hole 32 of the frame F, and the soundboard positioning pin 33. The height of the soundboard 8 with respect to the frame F can be adjusted by the height adjusting screw 35, and thus the desired striking height and peeling and piece pressure of the soundboard 8 can be easily obtained with high precision. Further, since the pin plate 9 is directly attached to the frame F, there is an advantage that the thickness of the pin plate 9 has no influence on the upper and lower portions of the space and the thickness tolerance can be relaxed.

Further, the string F, the soundboard 8 and the shelf 1 are attached to the frame F.
Since the 1 and the side plate 10 are directly attached, it is possible to omit the conventional strut assembly 4 that plays this role, and the number of parts and the assembling process can be reduced accordingly. In addition, the string S on the frame F
Since the shelf board 11 can be attached after the sheets are independently stretched, it is not necessary to perform a shaving process on the shelf board 11 with a large shaving machine or the like, and the assembling process can be further simplified.

Further, before attaching other parts to the frame F, the steps up to the string tension, including the step of burying the tuning pin 13 in the pin plate 9 attached to the frame F, can be completed in advance. Thirteen
The burying process will not cause production line stagnation,
The piano can be assembled efficiently. In order to further improve the efficiency of this assembly, it is preferable to promote the unitization of the component parts by, for example, attaching not only the damper unit 44 but also the keyboard 16 and the action 18 to the shelf board 11 in advance. By promoting such unitization, it is possible to disperse and assemble each unit in different places, and it becomes possible to assemble in a smaller space and production facility as compared with the conventional one.

The present invention can be implemented in various modes without being limited to the embodiments described above.
For example, the method of positioning the shelf board and the soundboard with respect to the frame is not limited to the example described above, and other suitable methods can be used. In addition, the configuration of the details can be appropriately changed without departing from the spirit of the present invention.

[0038]

As described above in detail, the grand piano of the present invention has effects such as simplification and efficiency of the assembling process and improvement of the assembling accuracy.

[Brief description of drawings]

FIG. 1 is a process diagram schematically showing an assembly process of a grand piano to which the present invention is applied.

FIG. 2 is a side view and a plan view of a frame of a grand piano according to the present invention.

FIG. 3 is a plan view, a side view, and a side view showing how the soundboard is attached to the frame.

FIG. 4 is a detailed view of a portion indicated by arrow A in FIG.

5A and 5B are a side view showing a mounting state of a shelf board to a frame, and a side view of the shelf board.

FIG. 6 is a perspective view of a fixing rail used for forming a side plate.

FIG. 7 is a side view and a plan view showing how the side plates are attached to the frame and the shelf plate.

FIG. 8 is a side view showing a method of fixing the side plate to the frame.

FIG. 9 is a side view showing a method of fixing the leg holder.

FIG. 10 is a side sectional view of a conventional grand piano.

FIG. 11 is a process diagram showing a conventional method of assembling a grand piano.

[Explanation of symbols]

 8 Sound board 9 Pin board 9a Low range pin board 9b Mid-high range pin board 10 Side plate 11 Shelf board 16 Keyboard 18 Action 26 1st reference hole 27 Skirt part 28 2nd reference hole 32 Sound board reference hole 33 Sound board positioning Pin 35 Soundboard height adjustment screw 38 Shelf plate reference hole 39 Shelf plate positioning pin 40 Shelf plate height adjustment screw F Frame S String

Claims (11)

[Claims] 1. A metal frame to which a pin plate is directly attached and a string can be stretched through the pin plate, and a shelf plate directly attached to the frame for mounting a keyboard and an action. And a grand piano characterized by 2. The grand piano according to claim 1, further comprising a side plate directly attached to the frame. 3. The ground according to claim 1, further comprising shelf plate positioning means for positioning the shelf plate at predetermined positions in the front-rear direction and the left-right direction with respect to the frame. piano. 4. The frame, wherein the shelf positioning means is aligned with a plurality of frame first reference holes and shelf reference holes respectively formed at predetermined corresponding positions of the frame and the shelf. The grand piano according to claim 3, wherein the grand piano is configured by a shelf positioning pin that is inserted between the first reference hole and the shelf reference hole. 5. The grand piano according to claim 3, further comprising a shelf height adjusting means for adjusting the height of the shelf with respect to the frame. 6. The grand piano according to claim 1, further comprising a soundboard directly attached to the frame. 7. A skirt portion is provided so as to hang down on a peripheral portion of the frame, the soundboard is attached to the frame in a state of being accommodated in the skirt portion, and the side plate is an outer surface of the skirt portion. The grand piano according to claim 6, wherein the grand piano is mounted along the frame. 8. The ground according to claim 6, further comprising soundboard positioning means for positioning the soundboard at predetermined positions in the front-rear direction and the left-right direction with respect to the frame. piano. 9. The frame, wherein the soundboard positioning means is aligned with a plurality of frame second reference holes and soundboard reference holes respectively formed at predetermined corresponding positions of the frame and the soundboard. The grand piano according to claim 8, wherein the grand piano comprises a soundboard positioning pin that is inserted between the second reference hole and the soundboard reference hole. 10. The grand piano according to claim 8, further comprising soundboard height adjusting means for adjusting the height of the soundboard with respect to the frame. 11. The grand piano according to claim 1, wherein the pin plate is composed of a plurality of pin plates divided in the musical range direction.