JPH09258723A - Upright piano assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble an upright piano efficiently with accuracy in small space and production equipment by assembling a plural kinds of units separately, and then connecting these units to one another. SOLUTION: An upright piano is divided into a support into UB, a sound plate unit US, a frame unit UF, a string unit UW, an interior unit UM, a case unit UC and a pedal unit UP. These units are separately assembled and then connected to one another. A support assembly 5 constituting the support unit UB, for instance, is assembled using a specified form. The constituent members of the support assembly 5, that is, an outer support 1a, an inner support 1b, a base 2, a box 3 and a cross beam 4, are inserted in the form and clamped to the inner surface of the form by a clamp or the like so as to be positioned on the basis of the inner surface of the form. In this state, these constituent members are connected to one another.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling an upright piano.

[0002]

2. Description of the Related Art FIG. 23 is an assembly process drawing of a conventional upright piano, and FIG. 24 is a side sectional view after assembly thereof.
Upright pianos have generally been assembled in the following procedure. First, the pillar assembly 5 is assembled from the pillar 1, the base 2, the girder 3, and the like. After the turning 71 is attached to the strut assembly 5, the sound board 16 to which the sound stick 18 and the piece 17 are bonded and the pin board 8 are installed. Attach the frame 21 to the pillar assembly 5 and attach the pin plate 8
After the tuning pin 25 is embedded through the frame 21, the string W is stretched between the tuning pin 25 and the hitch pin 22. A parent board 35 having arms attached thereto is attached to both sides of the column assembly 5 to support the shelf board 26 between the arms. In this case, in order to position the shelf plate 26 with respect to the frame 21, a reference hole 75 formed on the back surface of the shelf plate 26 is provided with a reference pin 76 provided on the front surface of the frame 21, as shown in FIG. To the left and right direction (depth direction in the drawing)
Or the rear part of the shelf 26 is attached to the frame 21 via a pair of left and right L metal fittings 77 as shown in FIG. It is conventionally known that the front part of a certain shelf board 26 is fixed to a case component such as a brace. A keyboard 27 is placed on the shelf plate 26 via a reed 31, and an action 28 with a hammer 29 is attached. In this case, the action 28 is supported by the action bracket 72, and the action bracket 72 has the upper end portion via the action bolt 73 to the strut assembly 5 and the lower end portion via the action base (not shown).
Are fixed respectively. Pacing (adjust the functions of keyboard 27 and action 28,
Adjust to perform proper string stroking) and perform tuning. The case 54 such as the roof 54, the lower front plate 55, and the upper front plate 56 is attached, and after the sound adjustment finishing and inspection, the assembly is completed.

[0003]

However, in such a conventional assembling method, the strut assembly 5 is used as a base, and a large number of individual parts, that is, the strut 71, the sound board 16,
Pin board 8, frame 21, string W, parent board 35, shelf board 26,
Since the keyboard 27, the action 28, and the like have to be attached in sequence, normally, these are all assembled at the same place. As a result, a vast space for storing and assembling parts and a large-scale production facility are required, which reduces the flexibility in selecting an assembly site and lacks the mobility of production, which results in small or medium volume production. It has the drawback that it cannot be easily adapted to overseas production.

In the conventional assembling method, the pillar assembly 5 is used.
Since a large number of components are sequentially mounted on the basis of, the manufacturing errors and mounting errors of the components are accumulated, so that the positional relationship between the components is likely to largely shift. Further, as described above, since the shelf plate 26 is attached across the frame 21 and the case parts such as the arms, if there is a problem in the positional relationship between the frame 21 and the case parts, the shelf plate 26 will be attached to the frame 21. It will be out of the proper positional relationship. In this case, since the case parts are generally made of wood, and are easily deformed due to manufacturing errors and twists and warps after manufacturing, the shelf plate 26 may be displaced to the frame 21 to some extent. Is inevitable. As a result, the positional relationship among the keyboard 27 mounted on the shelf board 26, the strings W stretched on the frame 21, and the action 28 located in the middle of them is shifted, and actions such as string alignment after attachment are performed. A great deal of time and labor is spent on the adjustment work of 28, which is a major factor for increasing the assembly cost.

The present invention has been made to solve the above problems and provides an assembling method of an upright piano which can be efficiently and accurately assembled in a smaller space and production equipment. It is an object.

[0006]

In order to achieve this object, the method of assembling an upright piano according to the present invention comprises separately assembling a plurality of types of units and connecting the assembled plurality of types of units to each other. Is characterized by assembling an upright piano.

According to this structure, the piano is unitized into a plurality of types of units, and these units are separately assembled and then connected to each other, whereby the upright piano is assembled. Therefore, each unit can be distributed and assembled in different places,
Compared with conventional products, it can be assembled in a smaller space and production equipment. In addition, as a result of improving the mobility of production in this way, it becomes easy to cope with small to medium volume production and overseas production.

Further, if the units are properly adjusted in advance, it is only necessary to adjust the positional relationship between the units after connecting them, and the adjustment work after assembly can be easily performed.

Preferably, one of the plurality of units is
A pillar unit including a pillar assembly assembled by framing an outer pillar, a base and a girder. According to this structure, the outer strut and the like are framed in the strut assembly to form a strut unit, and the strut assembly is used as a base to connect other units to assemble the upright piano. be able to.

Preferably, the strut assembly encloses the outer strut, the base and the girder in a formwork having a predetermined inner dimension.
It is assembled by connecting to each other while being pressed against the inner surface of the mold. According to this structure, a strut assembly having a predetermined outer dimension (frontage and height) equal to the inner dimension of the mold can be easily and accurately obtained simply by inserting the outer strut into the mold and connecting them. This makes it possible to completely eliminate the secondary processing, which has been conventionally performed for this purpose, due to the peripheral cutting of the column assembly.

Preferably, the strut unit comprises a base and girder affixed to the back of the strut assembly to cover the base and girder, respectively. In this configuration, even if a gap is created between the outer strut and the base or the girder due to the assembly of the strut assembly, the gap is finally hidden by the base or the girder, which affects the appearance of the piano. There is no such thing.

Preferably, the strut unit comprises a pin plate mounted on the upper front surface of the strut assembly, the pin plate being positioned with respect to the upper surface of the strut assembly. With this configuration, the pin plate is configured as a part of the column unit, and the pin plate can be accurately positioned in the vertical direction with reference to the upper surface of the column assembly that is accurately assembled.

Preferably, one of the plurality of units is
A soundboard unit including a soundboard, and a piece and a soundbar attached to the front and back of the soundboard, respectively. By fixing the soundboard to the front of the pillar assembly, the soundboard unit is a pillar unit. Connect to. According to this configuration, the soundboard, the bridge, and the soundbar are configured as a soundboard unit and assembled separately from the support unit. The assembled soundboard unit is connected to the strut unit by fixing the soundboard to the front of the strut assembly.

Preferably, the soundboard unit includes a striking member attached to a peripheral portion of the back surface of the soundboard, and a predetermined inclined surface is formed in advance on a mounting surface of the striking member to the soundboard. Fix the soundboard to the strut assembly through the percussion. According to this configuration, the striking part is formed as a part of the soundboard unit, and the sounding plate can be given a predetermined peeling by the striking inclined surface before the soundboard is fixed to the support post assembly. it can.

Preferably, when connecting the soundboard unit to the strut unit, the soundboard is positioned at a predetermined position on the strut assembly by soundboard positioning means. With this configuration, when the soundboard unit is connected to the strut unit, the soundboard positioning unit can accurately position the soundboard at a predetermined position of the strut assembly.

Preferably, one of the plurality of units is
A frame unit including a frame and a hitch pin provided on the frame. The frame unit is fixed to the front side of the column assembly with a soundboard interposed, thereby connecting the frame unit to the column unit. According to this configuration, the frame and the hitch pin are configured as a frame unit separate from the strut unit and the soundboard unit, facilitating unitization, and the frame unit interposes the soundboard between the frame and the strut assembly. By being fixed to the front side of the column, the column unit is connected.

Preferably, when connecting the frame unit to the column unit, the frame is positioned at a predetermined position of the column assembly by the frame positioning means. According to this configuration, when the frame unit is connected to the support unit, the frame positioning unit can accurately position the frame at a predetermined position of the support assembly.

Preferably, when the frame unit is connected to the strut unit, the spacing between the soundboard and the frame facing each other is adjusted to a predetermined distance by a spacer arranged between the soundboard and the frame. According to this structure, the distance between the soundboard and the frame can be adjusted to a predetermined length by the spacer, and thus a predetermined piece pressure can be easily obtained.

Preferably, one of the plurality of units is
A string unit comprising a string and a large number of sets of string assemblies, each set including two tuning pins with each end of the string wound around the string. According to this configuration, the strings and the tuning pins are configured as a string unit separate from the strut unit, the soundboard unit, and the frame unit, and unitization is further promoted.

Preferably, the two tuning pins of the string assembly are embedded in a pin plate provided on the strut unit, the strings are engaged with the hitch pins of the frame unit, and then the strings are stretched. In this way, the string is wound around the tuning pin in advance, and the string is stretched after the tuning pin is embedded in the pin plate, so the string is loosely stretched between the filaments of the coil part wound around the tuning pin. The strings can be stretched while easily adjusting the gaps. For this reason, the conventional "screw-up" work, which is performed after stringing for the same purpose, such as lifting by coiling and tapping with a driver, is unnecessary, and stringing work can be performed easily.

[0021] Preferably, one of the plurality of units is
It is an interior unit including a shelf board, a keyboard, an action, a hammer, and a damper mounted on the shelf board. By fixing the shelf board to the frame, the interior unit is connected to the frame unit. According to this configuration,
The unitization is further promoted by constructing the shelf, on which the keyboard, the action, the hammer and the damper are attached, as an interior unit. Further, since the shelf plate is directly fixed to the frame, it is not necessary to fix the shelf plate to the case parts such as the arms, and in that case, the positional relationship between the frame and the case parts does not affect the mounting accuracy of the shelf plate.

Preferably, the shelf is fixed to the frame via a plurality of shelf stays fixed to the frame, and each of the plurality of shelf stays has a reference pin and / or a reference hole at a predetermined position on the back surface. The frame has a plurality of shelf stay reference holes and / or shelf stay reference pins at predetermined positions on the front surface, and each of the plurality of shelf stays shelves the reference pins and / or reference holes. It is fixed to the frame while being engaged with the plate stay reference hole and / or the shelf stay reference pin. According to this configuration, the shelf stay is attached to the frame while the reference pin and / or the reference hole of the shelf stay are engaged with the shelf stay reference hole and / or the shelf stay reference pin on the front surface of the frame. By fixing, the shelf stay and the shelf fixed to the shelf stay can be accurately positioned at predetermined positions in the vertical direction and the horizontal direction with respect to the frame.

Preferably, the shelf board is slid in the front-rear direction on the shelf stay by the guide of the shelf guide means and fixed to the shelf stay at a predetermined position in the front-rear direction. With this configuration, the shelf board can be adjusted and fixed to a predetermined position in the front-rear direction. Therefore, the shelf board can be attached to the frame in a state of being positioned at predetermined positions in three directions of up, down, left and right, and front and back with respect to the frame via the shelf stay. In this case, the shelf is attached to the frame completely independently of the case without any case parts, so the positional relationship between the frame and case has no effect on the position accuracy of the shelf. Absent. As a result, the shelf board can be attached to the frame at a predetermined three-dimensional position with high accuracy, and hence the subsequent adjustment work of actions such as string adjustment can be performed very easily.

Preferably, the shelf guide means comprises a guide slot extending in the front-rear direction at the front of the shelf stay, and a screw engaging with the guide slot is attached to the front of the lower surface of the shelf. . According to this configuration, the shelf is guided in the front-rear direction by the screw attached to the front portion of the lower surface of the shelf and the guide elongated hole of the shelf stay, and is fixed to the shelf stay by tightening the screw. In this way, by fixing the front part of the shelf board in the left-right direction by the guide long hole and fixing it with the screws, the shelf board is firmly fixed while surely preventing the displacement of the shelf board in the left-right direction. be able to.
Further, the above advantages can be obtained with a relatively simple structure of only screws and guide elongated holes.

Preferably, the elongated guide hole is opened on the front surface of the shelf stay. With this configuration, screws are attached to the lower surface of the shelf board in advance, the shelf board is placed on the shelf board stay, and then it is easily engaged with the long guide holes that open on the front surface of the shelf board stay while sliding backward. It becomes possible to attach the shelf plate more easily.

In this case, the frame has a shelf plate reference hole and / or a shelf plate reference pin at a predetermined position on the front surface, and the shelf plate has a reference pin that engages with the shelf plate reference hole and / or the shelf plate reference pin. And / or has a reference hole on the back surface. According to this configuration, by engaging the reference pin and / or the reference hole of the shelf plate with the reference plate hole and / or the reference plate pin of the frame, the shelf plate moves in the vertical direction and the horizontal direction with respect to the frame. Since it is directly positioned at a predetermined position, the shelf plate can be attached with higher accuracy. In particular, when a plurality of shelf stays are formed in a left-right pair, a shelf board reference hole and / or a shelf board reference pin are provided in the middle portion of the frame to "drip" the middle portion of the shelf board. Can be reliably prevented.

Preferably, the interior unit is pre-conditioned prior to being connected to the frame unit. With this configuration, the mutual positional relationship among the keyboard, action, hammer, and damper on the shelf plate is adjusted to an appropriate relationship in advance before being connected to the frame unit, so that the shelf plate can be directly attached to the frame and the accuracy can be improved. Coupled with being well mounted, the action adjustment work after the connection of the interior unit can be performed more easily. For example, when the shelf board is attached to the frame, even if the positional relationship between the action and the strings is slightly misaligned, the entire shelf board can be moved relative to the frame and finely adjusted to facilitate the adjustment work. You can

Preferably, the shelf plate is formed by framing a plurality of hollow metal mold members. According to this configuration, since the shelf plate is made of metal, the manufacturing error is small and the dimensional stability is high, the dimensional accuracy of the shelf plate itself is improved, and the mounting accuracy thereof is further improved. Further, since the shelf plate is formed by framing a plurality of hollow mold members, it is possible to reduce the weight.

Preferably, one of the plurality of units is
It is a case unit that is assembled by connecting at least a main plate, arms, and gable base to each other. With this configuration, a part of the case components such as the parent board is configured as a case unit, and unitization is further promoted.

Preferably, one of the plurality of units is
It is a pedal unit assembled by connecting at least a bottom plate and pedal components to each other. With this configuration, the pedal component is also configured as a pedal unit together with the bottom plate, and unitization is further promoted.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an assembling process of an upright piano according to a first embodiment of the present invention. As shown in the figure, in this assembling method, the upright piano has seven units, namely, a pillar unit UB, a soundboard unit US, a frame unit UF, a string unit UW, an interior unit UM, a case unit UC, and a pedal unit UP. After assembling these units separately and independently,
By connecting to each other, the completed piano shown in FIG. 2 is assembled. Hereinafter, the assembly process of each unit and the connection process between the units will be described in this order. In the following description, common reference numerals will be used for those components that are common to those already described with reference to FIGS.

1. Strut unit assembling process The strut unit UB, as shown in FIG.
1a, inner middle columns 1b, 1b, and outer columns 1a,
1a, a pillar assembly 5 composed of a base 2, a box 3 and a girder 4 passed laterally, a base sticker 6 and a girder sticker 7 stuck to the back surface of the pillar assembly 5, a box 3 and a girder 4 And a pin plate 8 (see FIG. 6) attached to the front surface of the.

The column assembly 5 is assembled using a form 9 as shown in FIG. The mold 9 is made of a highly rigid material such as wood or iron and is formed to have a predetermined inner dimension. Within this mold 9 are the components of the strut assembly 5, namely the outer strut 1a and the middle strut 1
b, the base 2, the box 3 and the girder 4 are inserted, and the outer support 1a, the base 2 and the girder 4 are clamped by the clamp 10 or the like to form the form 9
These constituent members are connected to each other in a state in which they are fastened to the inner surface of, that is, in a state of being positioned with reference to the inner surface of the mold 9. The connection of these components is, for example, as shown in FIG.
The fixing dowel 11 is used together with the positioning dowel 11. After that, a base attachment 6 and a girder attachment 7 are adhered to the back surface of the assembled support post assembly so as to cover the base 2, the box 3 and the girder 4, respectively.

According to the method of assembling the pillar assembly 5 as described above, it is only necessary to insert the respective constituent members into the mold 9 and connect them.
The strut assembly 5 having a predetermined outer dimension (frontage and height) equal to the inner dimension of the mold 9 can be easily and accurately obtained, and the outer circumference of the strut assembly conventionally performed for this purpose can be obtained. Secondary processing due to can be completely abolished. Also,
Even if a gap C is formed between the outer strut 1a and the base 2 or the girder 4 due to the assembly of the strut assembly (see FIG. 5), this gap C is finally hidden by the base sticker 6 or the girder sticker 7. Therefore, it does not affect the appearance of the piano.

After assembling the pillar assembly 5, as shown in FIG. 6, the pin plate 8 is positioned with reference to the upper surface thereof,
The pin plate 8 is screwed to the front surfaces of the box 3 and the girder 4 with an adhesive. Thereby, the pin plate 8 can be accurately positioned in the vertical direction. Then, the pillar assembly 5
The two back assembly reference holes 13, 13 are formed at predetermined positions of the pin plate 8 with reference to the upper surface and the side surface on the bass side, and the back assembly reference pins 14, 14 are driven into them. Further, the two soundboard unit mounting reference holes 15, 15 are formed at predetermined positions on the diagonal line of the base 2 and the box 3 with the back assembly reference pin 14 as a reference, and the present process is completed.

2. Soundboard unit assembly process Soundboard unit US, soundboard 16, pieces (long piece and short piece)
It is composed of 17, a sound bar 18, and a batting 19. The manufacturing procedure is shown in FIG. 7. First, the soundboard 16 is formed by laterally stripping and adhering spruce material (FIG. 7A), and a large number of holes are formed at predetermined positions on the soundboard 16. NC
A hole is formed by processing (Fig. (B)). These holes are
Two soundboard unit mounting reference holes 16a, 16a arranged vertically corresponding to the soundboard unit mounting reference holes 15, 15 of the strut assembly 5, a large number of soundboard unit mounting holes 16b in the peripheral portion, and a central portion. These are the side piece mounting holes 16c and the like. Next, on the surface of the soundboard 16, the bridge 17 is inserted through the bridge mounting hole 16c.
Is adhered ((c) in the figure), and the sound bar 18 is adhered to the back surface, and then coating is performed ((d) in the figure).

Then, as shown in FIG.
The sounding board system unit US is completed by staking and bonding 19 around the front peripheral portion of 6. The positioning of the batting 19 at this time is performed by aligning the soundboard unit mounting reference hole 16a and the soundboard unit mounting hole 16b of the soundboard 16 with the holes 19a formed in the batting 19 corresponding to these. By inserting the dowels 20 between the holes, the accuracy is improved. In addition, as shown in FIG. 8, the joint surface of the batting 19 with the soundboard 16 is preliminarily processed so as to be an inclined surface 19a having a predetermined slope in order to give the soundboard 16 an appropriate stroke. .

3. Frame Unit Assembly Process The frame unit UF includes a frame 21 and a hitch pin 22. In this assembly process, first, the frame 21 is cast. As shown in FIG. 9, the frame 21 has a rectangular front shape, and both side portions on the front surface are flat shelf stay attaching portions 21a, 21a for attaching shelf stays described later. Then the frame 21
After forming a large number of various holes such as hitch pin holes (not shown) by NC processing at predetermined positions of the rack plate, the shelf plate reference pin 2 is provided at the two left and right holes (not shown) formed at predetermined positions on the front surface.
3 and 23 are buried. The holes formed in the frame 21 include upper and lower two shelf stay reference holes 24, 24 formed at predetermined positions of each shelf stay attaching portion 21a. Next, the hitch pin 22 is driven into the hitch pin hole, and this step is completed.

4. String unit assembly process As shown in FIG. 10, the string unit UW includes a number of sets of two tuning pins 25, 25 and a string W pre-wound between them and made of a wire. It consists of a string assembly. To assemble each string assembly, pass one end of the string W through a hole 25 (not shown) of one tuning pin 25 and wind it for three and a half turns, and then set the other end of the string W to the other tuning pin 25. The same is done by wrapping.

5. Interior Unit Assembly Process As shown in FIG. 11, the interior unit UM includes a shelf plate 26,
The keyboard 27, the action 28, the hammer 29, and the damper 30 are provided, and the reed 31 and the action bracket 32 for attaching the keyboard 27 to the shelf 26 are provided. The shelf plate 26 is formed by framing a hollow mold material made of metal such as iron, and thereby, it is possible to reduce the weight and obtain high manufacturing dimensional accuracy and dimensional stability. At a predetermined position on the back of the shelf board 26,
2 corresponding to the shelf plate reference pins 23, 23 of the frame 21
One frame reference hole 33 (only one is shown) is formed.

When assembling the interior unit UM, first, the reed 31 is screwed to the shelf plate 26, and then the keyboard 27 is placed thereon.
Attach and support. When attaching the reed 31, the reference holes 31a and 26a formed at predetermined positions on the lower surface of the reed 31 and the upper surface of the shelf plate 26, and the reference holes 31a and 26, respectively.
A dowel 34 inserted between a and is used, whereby
The keyboard 27 is accurately positioned at a predetermined position on the shelf plate 26.

Next, the hammer 28 and the damper 30 are attached to the action 28 supported by the action bracket 32.
After attaching the action bracket 32 to the shelf plate 26
Attach to Also when the action bracket 32 is attached, the reference hole 26a and the reference pin 32a as shown in the figure are used to accurately position the action 28 and the like at a predetermined position with respect to the shelf plate 26. Next, after performing a test shot to familiarize the action 28, the entire interior system unit UM is set on a temporary bag for pacing (not shown), pacing is performed, and damper pressure is further adjusted to adjust the interior system. Complete unit UM. As described above, the interior system unit UM has the keyboard 2 with the shelf plate 26 as a reference.
7, action 28, hammer 29 and damper 30
Are adjusted in advance with high precision so as to have an appropriate positional relationship.

6. Case unit assembly process The case unit UC consists of the main board 35, arms 36, and wife base 3
7 and the shelf support posts 38 are integrally assembled in advance, and are composed of a pair of left and right (see FIG. 17).

7. Pedal unit assembling process The pedal unit UP is composed of the bottom plate 39 and the pedal component 40, that is, the pedal 40a, the balance 40b, and the lifting rod 40c, which are preassembled.

Next, the units UB, US, UF, UW, UM, UC and PU assembled as described above.
With the pillar unit UB as a base in the following connecting step.

8. Soundboard unit connecting step First, the soundboard unit US is connected to the support unit UB. In this step, as shown in FIG. 12, the support unit UB is placed flat, and the soundboard unit mounting reference holes 15 and 15 processed into the support unit UB and the soundboard unit US are used.
By aligning the soundboard unit mounting reference holes 16a and 16a processed into the above, and inserting the dowel 41 between both holes, both units UB and US are accurately positioned. That is, in the present embodiment, the soundboard unit mounting reference hole 1
5, 16a and the dowel 41 constitute a soundboard positioning means. After this positioning, the soundboard unit mounting holes 16b of the soundboard unit US are used to connect both units UB and US with screws, and the present process is completed.

9. Frame unit connecting step Next, the frame unit UF is connected to the soundboard 16 side surface of both connected units UB and US. That is, as shown in FIG. 13, the back assembly reference pin 14 embedded in the pin plate 8 of the column unit UB is positioned by fitting the frame attachment reference hole 42 corresponding to the back assembly reference pin 14 formed in the frame 21. That is, in the present embodiment,
Back assembly reference pin 14 and frame attachment reference hole 42
Form the frame positioning means. In this state, the back surface of the frame 21 is brought into close contact with the upper surface of the pin plate 8 and the screws are tightened to connect the frame unit UF. At the time of this connection, a spacer 43 having a predetermined thickness is interposed in a portion other than the pin plate 8. As a result, the space between the front surface of the soundboard 16 and the back surface of the frame 21 is maintained at a predetermined distance, so that a predetermined piece pressure can be easily obtained.

10. String unit connecting step Next, the string unit UW is connected. In this connection, first, a tuning pin bush (not shown) is driven into the hole formed in the frame 21, and then a pilot hole (not shown) is formed in the pin plate 8 via the tuning pin bush. Then, the tuning pin 25 of the string unit UW is driven into this pilot hole, and the string W wound around the tuning pin 25
After hooking the hitch pin 22 with the tuning pin 2
While adjusting the tuning pin 2 so that there is no gap between the filaments of the coil part 25a of the string W wound around the tuning pin 2,
The string is turned by turning 5, and the lower limit is carried out to complete the present step.

In this way, the string W is attached to the tuning pin 25.
Since the string W is wound in advance and the tuning pin 25 is driven and then the string W is stretched, the string W is loosely stretched, and the string W is easily adjusted so that there is no gap between the filaments of the coil 25a. Can be set up. For this reason, the conventional, which was performed after stringing for the same purpose,
It is not necessary to carry out the work of "raising" by lifting with a coil and hitting with a driver, and the stringing work can be performed easily.

11. Interior Unit Connecting Step Next, the interior unit UM is connected. This connection is shown in FIG.
It carries out using the shelf stay 44 shown in FIGS. The shelf stays 44 are composed of a pair of right and left, and each shelf stay 44 is made of metal, for example, iron, and as shown in FIG. 14, a frame attachment portion 44a having a U-shaped cross section and extending vertically. An L-shape is formed from a flat plate-shaped shelf mounting portion 44b that extends forward from the upper end of the frame mounting portion 44a. Two upper and lower frame reference pins 45, 45 are provided so as to project at a predetermined position on the back surface of the frame attachment portion 44a. Further, the shelf board mounting portion 44b is used for the shelf board 2
It has a length in the front-rear direction sufficient to support 6 and is provided with a guide elongated hole 46 opening to the front surface.

This shelf stay 44 is attached to the frame 21 of the frame unit UF as shown in FIG. That is, a resin bush 47 is inserted into the shelf stay reference hole 24 formed in the frame 21, and a resin washer 48 is interposed in the bush 47 as a spacer. 45 is inserted, and the shelf stay 44 is fixed to the frame 21 with three screws 49 passed from the shelf stay 44 side. By engaging the frame reference pin 45 with the shelf stay reference hole 24, the shelf stay 44 is accurately positioned with respect to the frame 21 at predetermined positions in the left-right direction and the up-down direction.

Next, the interior unit UM is connected to the frame 21 through the attached shelf stays 44 as shown in FIGS. First, a tapping screw 50 (screw) is provided on the front surface of the lower surface of the shelf plate 26 of the interior unit UM.
Is loosely attached, the shelf plate 26 is placed on the shelf plate stay 44, the frame reference hole 33 of the shelf plate 26 is inserted into the shelf plate reference pin 23 of the frame 21, and the tapping screw 50 of the shelf plate 26 is guided to the shelf plate stay 44. The shelf plate 26 is fixed to the shelf plate stay 44 by engaging the elongated hole 46, sliding the shelf plate 26 along the guide elongated hole 46 and adjusting it to a predetermined position, and then tightening the tapping screw 50. Finish the process.

As described above, the shelf plate 26 is placed on the shelf plate stay 44 which is accurately positioned and fixed to the frame 21, and the tapping screw 50 thereof is moved in the left-right direction by the guide elongated hole 46. By being slid and guided in the front-rear direction while being regulated in movement and adjusted, the frame 21 is positioned at predetermined positions in the up-down, left-right, and front-rear directions. In this case, the shelf plate 26 is attached to the frame 21 without any case parts, and is not adversely affected by manufacturing errors of the case parts and deformation after the manufacture. Further, by fixing the front portion of the shelf plate 26 with the tapping screw 50, the vertical movement thereof can be reliably prevented.

Further, by engaging the frame reference holes 33 of the shelf plate 26 with the shelf plate reference pins 23 of the frame 21, the vertical and horizontal positioning of the shelf plate 26 becomes more accurate, and the shelf plate 26 becomes more precise. It is possible to reliably prevent "sagging" of the intermediate portion of the.

Therefore, according to the above connecting method, the shelf plate 26 of the interior unit UM can be attached to the frame 21 while being accurately positioned at predetermined positions in the three directions of left, right, up and down, and front and back. In addition, the interior unit UM itself, as described in the section of the assembly process,
The keyboard 27, the action 28, the hammer 29, and the damper 30 are accurately adjusted in advance with the shelf plate 26 as a reference so as to have an appropriate positional relationship. Therefore, the positional relationship between the keyboard 27, the action 28, and the string W stretched on the frame 21 among the three members after the connection of the interior unit UM is almost eliminated, and the subsequent adjustment work such as string alignment can be performed very easily. be able to.

Further, as is clear from the above description, all the steps from the soundboard unit connecting step to the interior unit connecting step can be performed with the supporting column unit placed flat, so that the workability is very good.

12. Case Unit Connecting Step Next, the case units UC are connected. In this step, as shown in FIG. 17, the pillar unit UB, the frame unit UF and the like connected to each other are set upright,
Attach the case unit UC to the frame 21 with tapping screws 51.
Connect with. In this case, the positioning of the case unit UC is performed, for example, in the up-down direction and the front-back direction by the reference pin 36 provided on the inner surface of the arm 36 of each case unit UC.
a and the reference holes 26b provided on both outer side surfaces of the shelf plate 26, and in the left-right direction, frame left and right plates 52, 52 attached to both side surfaces of the frame 21 are used as shown in FIG. Then do.

More specifically, first, the left and right plates 52, 52 made of wood are adhered to both outer side surfaces of the frame 21 (FIG. 9 (a)), and then attached with reference holes (not shown) of the frame 21 as a reference. The frame left and right plates 52, by sliding the handy molder along the dimensioning jig (not shown) to cut each frame left and right plates 52,
The outer dimension between 52 can be easily adjusted to the predetermined front dimension W of the main plate 35 ((b) of the same figure). As a result, the case unit UC can be accurately positioned with respect to a unit such as the frame unit UF in three directions of up, down, left and right, and front and back.

13. Pedal unit connecting step Next, the last unit, the pedal unit UP, is connected. This completes the connection of all units.

14. The final step end, the rest of the case parts 53, for example a roof 54, lower front plate 55, after coupling and upper front plate 56 and front base 57, performs a final adjustment actions 28 such as string matching, shown in Figure 2 Assembly of the upright piano is completed.

As described above, according to this embodiment, the upright piano is basically composed of seven units UB, US,
It is composed of UF, UW, UM, UC, and UP, and after each unit is individually assembled, these are connected to complete an upright piano. Therefore, the units can be dispersed and assembled at different places, and assembling can be performed in a smaller space and production equipment as compared with the conventional case. As a result, the assembly place can be selected relatively freely.For example, considering the procurement of materials / parts, labor costs and technical capabilities, etc., select the most advantageous region or country to produce the unit, It is easy to adopt a method such as connecting a unit to complete a piano in an area close to the consumption area, and thereby it is possible to reduce labor costs and transportation costs. Further, as a result of improving the mobility of production in this way, it is possible to easily cope with small-to-medium-volume production and overseas production.

Further, the units are connected to each other after the positional relationship and the like have been adjusted appropriately for each unit in advance. Therefore, after the assembly, only minor adjustments between the units are required, which facilitates the adjustment work. It can be carried out. In particular, the interior unit UM has a keyboard 27,
Since the action 28, the hammer 29, and the damper 30 are accurately adjusted in advance so as to have an appropriate positional relationship, when the interior unit UM is subsequently connected to the frame unit UF, the shelf plate 26 is inserted via the shelf plate stay 44. The final adjustment work of the action 28, such as string alignment, can be performed extremely easily in combination with the direct and accurate attachment to the frame 21. That is, when the two units UM and UF are connected, even if the positional relationship between the action 28 and the string W is slightly shifted, the entire interior unit UM including the shelf plate 26 is moved with respect to the frame 21,
The adjustment work can be easily performed by only making fine adjustments.

Next, the method of assembling the upright piano according to the second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 20, this upright piano is a pillarless type in which the pillar assembly 5 of the first embodiment is abolished, and is assembled by using the frame 21 as a base. Further, the string W and the tuning pin 25 are not configured as a string unit but are attached separately.

As a result, in the assembling method of this embodiment, as shown in FIG.
Units, namely frame unit UF2, soundboard unit US2, interior unit UM, case unit U
Assembling is performed by being divided into C and the pedal unit UP. The configuration and assembling method of each unit and the connecting method between the units according to the present embodiment are common to those according to the first embodiment described above, and therefore, in the following description, the common configuration will be described. The same reference numerals will be used for the parts, and the description will focus on the differences from the first embodiment.

1. Frame Unit Assembly Process The frame unit UF2 includes the frame 21 and the hitch pin 2 that form the frame unit UF of the first embodiment.
In addition to 2, it includes a pin plate 8 and a tuning pin 25. At the time of casting, the frame 21 has a pin plate mounting frame portion 21b that opens to the upper portion on the back side of the frame 21 and a soundboard mounting frame portion 21 that opens to the lower side thereof.
c is formed (see FIG. 20). In order to assemble the frame unit UF2, first, a predetermined hole is formed in the frame 21, and then the pin plate 8 is fitted into the pin plate mounting frame portion 21b of the frame 21 and tightened with the clamp 60 as shown in FIG. , Screw it on. Next, the tuning pin 25 is driven into the pin plate 8, the hitch pin 22 is embedded in the frame 21, and this step is completed.

2. Soundboard unit assembly process The soundboard unit US2 is the soundboard unit U of the first embodiment.
Similar to S, the soundboard 16, the piece 17, the soundbar 18 and the batting 61 are used, and the assembling method is also the soundboard unit U.
Similar to S. However, unlike the batting 19 of the first embodiment, the batting 61 is a flat one having a constant thickness without an inclined surface and serves as a spacer when the soundboard unit US2 is attached to the frame 21 described later. Function.

3. Assembly of interior, case and pedal unit
Step configuration and assembly method of interior units UM, case unit UK and pedal unit UP is first
It is exactly the same as the embodiment.

4. Frame unit / Soundboard unit connection
Process In this process, first, as shown in FIG. 22, the frame unit UF2 is turned upside down, and the soundboard unit US2 is fitted into the soundboard mounting frame portion 21c of the frame 21. Next, the frame reference holes and the soundboard reference holes (neither shown) formed at the positions corresponding to each other on the soundboard 16 and the frame 21 were aligned, and the dowels were used to perform mutual positioning. After that, four soundboard retainers 62 made of Matoa or the like are arranged on the peripheral portion of the soundboard 16. The soundboard retainer 62 has screw mounting holes 62a previously formed at positions corresponding to the frame mounting holes 16e of the soundboard 16. Then, after aligning these holes, the tapping screw 63 is tightened so that both units UF
2. Fix US2 to each other.

The rear surface of the soundboard mounting frame portion 21c,
That is, the contact surface with which the batting 61 abuts has a predetermined curved shape, and by mounting the soundboard unit US2, the soundboard 8 has a predetermined peeling along the curved shape of the contact surface. Granted. Therefore, the batting 61 may be a flat one having a constant thickness, and the troublesome batting and shaving conventionally performed is unnecessary, and the soundboard 16 can be easily peeled. Then, the connected units UF2, U
The entire S2 is inverted, the string W is stretched between the tuning pin 25 and the hitch pin 22 embedded in the frame 21, the lower limit is performed, and this step is completed.

5. Connection of interior, case and pedal unit
Steps and Final Steps These steps are performed exactly as in the first embodiment, and the assembly of the upright piano shown in FIG. 20 is completed.

As described above, also in this embodiment, the upright piano is divided into units, and after assembling each unit, these are connected to complete the upright piano. The benefits of the unitization provided can likewise be obtained.

The present invention is not limited to the embodiment described above and can be implemented in various ways.
For example, the number of types of units is arbitrary. For example, in the second embodiment, the string W and the tuning pin 25 are separately configured, but they may be configured as the string unit UW as in the first embodiment. Also,
The configuration of each unit can be changed as appropriate. For example, although the pin plate 8 is a part of the column unit UB in the first embodiment, it may be a part of the frame unit UF as in the second embodiment. Further, the case unit UC is composed of the main plate 35, the arms 36, the gable base 37, and the shelf support post 38 in both embodiments, but other case parts such as the front base 57 are appropriately added thereto. Or you may reduce it conversely.

Further, in the embodiment, in order to position the shelf stay 44 with respect to the frame 21, the frame reference pin 45 is provided in the shelf stay 44 and the shelf stay reference hole 24.
Are provided in the frame 21, respectively, but these may be provided in a male-female opposite relationship, that is, the reference pin may be provided in the frame 21 and the reference hole may be provided in the shelf stay 44, or the reference pin and the reference hole may be mixed. Good. This means
The same applies to the relationship between the reference pin and the reference hole for positioning the shelf plate 26 with respect to the frame 21. Further, although the shelf stays 44 are composed of a pair of left and right sides, it is also possible to have three or more. In addition, the detailed configuration can be appropriately changed without departing from the spirit of the present invention.

[0074]

As described above in detail, the assembling method of the upright piano of the present invention has an effect that it can be assembled efficiently and accurately in a smaller space and production equipment.

[Brief description of drawings]

FIG. 1 is a process diagram showing an assembling method of an upright piano according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of an upright piano assembled by the assembling method of FIG.

FIG. 3 is a front view and a side view of a column unit excluding a pin plate.

FIG. 4 is a perspective view showing a method of assembling a strut assembly of a strut unit.

FIG. 5 is a partially enlarged front view showing a method of assembling the support column assembly.

FIG. 6 is a front view and a side view of the column unit that has been assembled.

FIG. 7 is a diagram showing a manufacturing procedure of the soundboard unit.

FIG. 8 is an enlarged view of an end portion of the soundboard unit.

FIG. 9 is a front view of the frame.

FIG. 10 is a perspective view showing one string assembly of the string unit.

FIG. 11 is a side view of the interior unit.

FIG. 12 is a view showing a method of connecting the soundboard unit to the strut unit.

FIG. 13 is a diagram showing a method of connecting the frame unit to the column unit.

FIG. 14 is a perspective view showing a method of attaching the shelf stays to the frame.

FIG. 15 is a perspective view showing a method of positioning and fixing the shelf plate to the shelf stay.

FIG. 16 is a diagram showing a method of attaching the interior unit to the frame.

FIG. 17 is a perspective view showing a method of connecting case units.

FIG. 18 is a plan view showing a method of positioning the case unit.

FIG. 19 is a process drawing showing the method of assembling the upright piano according to the second embodiment of the present invention.

20 is a side sectional view of the upright piano assembled by the assembling method of FIG.

FIG. 21 is a diagram showing a method of attaching the pin plate to the frame.

FIG. 22 is a perspective view showing a method of connecting the soundboard to the frame.

FIG. 23 is a process drawing showing the method of assembling the conventional upright piano.

FIG. 24 is a side sectional view of an upright piano assembled by a conventional assembling method.

FIG. 25 is a side view schematically showing a conventional shelf plate mounting method.

[Explanation of symbols]

 1a Outer column 2 Base 4 digits 5 Column assembly 6 Base attachment 7 digits attachment 8 Pin plate 9 Formwork 14 Back assembly reference pin 15 Soundboard unit installation reference hole 16 Soundboard 16a Soundboard unit installation reference hole 17 Piece 18 Sound stick 19 Turning around 19a Sloping surface 21 Frame 22 Hitch pin 23 Shelf plate reference pin 24 Shelf plate stay reference hole 25 Tuning pin 26 Shelf plate 27 Keyboard 28 Action 29 Hammer 30 Damper 33 Frame reference hole 35 Parent plate 36 Arms 37 Wife base 38 Shelf support Pillar 39 Bottom plate 40 Pedal part 41 Dowel 42 Frame mounting reference hole 43 Spacer 44 Shelf plate stay 45 Frame reference pin 46 Long guide hole 50 Tapping screw W string UB Column unit US Soundboard unit UF Frame unit UW String unit UM Interior unit UC case Unit U P pedal unit UF2 frame unit US2 soundboard unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidetaka Hanajima 200 Terashima-cho, Hamamatsu City, Shizuoka Prefecture Kawai Musical Instrument Mfg. Co., Ltd.

Claims (23)

[Claims] 1. A method for assembling an upright piano, comprising assembling a plurality of types of units separately and connecting the assembled plurality of types of units to each other to assemble an upright piano. 2. The upright according to claim 1, wherein one of the plurality of types of units is a strut unit including a strut assembly assembled by framing an outer strut, a base and a girder. How to assemble a piano. 3. The strut assembly is configured such that the outer strut, the base and the girder are placed in a mold having a predetermined inner dimension and are connected to each other while being pressed against the inner surface of the mold. The upright piano assembling method according to claim 2, wherein the upright piano is assembled. 4. The up according to claim 3, wherein the strut unit comprises a base attachment and a girder attachment attached to the back of the strut assembly to cover the base and the girder, respectively. How to assemble a light piano. 5. The strut unit comprises a pin plate attached to an upper front surface of the strut assembly, the pin plate being positioned with respect to an upper surface of the strut assembly. The method for assembling the upright piano according to claim 2. 6. One of the plurality of types of units is a soundboard unit including a soundboard, and a piece and a soundbar attached to the front and back surfaces of the soundboard, respectively. The method for assembling an upright piano according to claim 2, wherein the soundboard unit is connected to the strut unit by fixing the soundboard unit to the front surface of the assembly. 7. The soundboard unit includes a striking member attached to a peripheral portion of a rear surface of the soundboard, and a predetermined inclined surface is previously formed on a mounting surface of the striking member to the soundboard. The upright piano assembling method according to claim 6, wherein the soundboard is fixed to the strut assembly through the striking. 8. The soundboard unit is positioned at a predetermined position of the pillar assembly by soundboard positioning means when the soundboard unit is connected to the strut unit. The method for assembling the upright piano described in. 9. One of the plurality of types of units is a frame unit including a frame and a hitch pin provided on the frame, and the frame is placed on the front side of the strut assembly with the soundboard interposed. By fixing
The method for assembling an upright piano according to claim 6, wherein the frame unit is connected to the support unit. 10. The upright according to claim 9, wherein the frame is positioned at a predetermined position of the strut assembly by frame positioning means when the frame unit is connected to the strut unit. How to assemble a piano. 11. When connecting the frame unit to the strut unit, a spacer provided between the soundboard and the frame sets a predetermined distance between surfaces of the soundboard and the frame which face each other. The method for assembling an upright piano according to claim 9, wherein the method is adjusted to a distance. 12. One of the plurality of types of units is a string unit including a plurality of sets of string assemblies, each of which is a string and two tuning pins wound around each end of the string. The assembling method of the upright piano according to claim 9. 13. The two tuning pins of the string assembly are embedded in a pin plate provided in the strut unit, and the strings are tensioned after engaging the strings with the hitch pins of the frame unit. The upright piano assembling method according to claim 12, wherein the upright piano is a string. 14. One of the plurality of types of units is an interior unit including a shelf and a keyboard, an action, a hammer and a damper mounted on the shelf, and the shelf is fixed to the frame. The upright piano assembling method according to claim 9, wherein the interior unit is connected to the frame unit. 15. The shelf is fixed to the frame via a plurality of shelf stays fixed to the frame,
Each of the plurality of shelf stays has a reference pin and / or a reference hole at a predetermined position on the back surface, and the frame is
A plurality of shelf stay reference holes and / or shelf stay reference pins are provided at predetermined positions on the front surface, and each of the plurality of shelf stays is provided with the reference pin and / or reference hole. 15. The method for assembling an upright piano according to claim 14, wherein the upright piano is fixed to the frame while being engaged with a shelf stay reference pin. 16. The shelf board is slid in the front-rear direction on the shelf stay by the guide of the shelf guide means, and is fixed to the shelf stay at a predetermined position in the front-rear direction. The method for assembling the upright piano according to item 15. 17. The shelf guide means comprises a guide elongated hole extending in the front-rear direction in the front portion of the shelf stay, and a screw engaging with the guide elongated hole is attached to the front portion of the lower surface of the shelf plate. The method for assembling the upright piano according to claim 16, wherein the upright piano is assembled. 18. The method for assembling an upright piano according to claim 17, wherein the guide elongated hole is opened on the front surface of the shelf stay. 19. The frame has a shelf reference hole and / or a shelf reference pin at a predetermined position on the front surface, and the shelf engages with the shelf reference hole and / or the shelf reference pin. The method for assembling an upright piano according to any one of claims 15 to 18, further comprising a reference pin and / or a reference hole on the back surface. 20. The method for assembling an upright piano according to claim 14, wherein the interior unit is tuned in advance before being connected to the frame unit. 21. The method for assembling an upright piano according to claim 14, wherein the shelf plate is formed by framing a plurality of hollow metal mold members. 22. The upright piano according to claim 14, wherein one of the plurality of types of units is a case unit assembled by connecting at least a main plate, a brace, and a gable base to each other. Assembly method. 23. The method for assembling an upright piano according to claim 22, wherein one of the plurality of types of units is a pedal unit assembled by connecting at least a bottom plate and a pedal component to each other.