JPH09325764A - Method for assembling grand piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost for assembling a grand piano by using side boards as bases and successively mounting plural parts to these side boards. SOLUTION: The pileups used thus far are abolished for this grand piano. The grand piano is assembled by using the side boards 10 as the bases and directly and successively mounting a soundboard unit US, a frame unit UF, strings S, keybed unit UB and keyboard unit UK at the side boards 10. The side boards 10 are composed of trisected parts consisting of two sheets of flat boards constituting the straight parts on the right and left front sides of the side boards 10 and one sheet of curved board constituting the remaining curved part of the side boards 10. The side boards 10 are used as the bases in such a manner and the parts are successively mounted at the other of the side boards 10. The main parts to be mounted at the side boards 10 are composed of the soundboard unit US, the frame unit UF, the keybed unit UB and the keyboard unit UK, by which the parts are unitized.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method of assembling a grand piano.

[0002]

17 to 19 show the structure of a conventional grand piano, and FIG. 16 shows the assembling process thereof. Assembling of a grand piano has been generally performed by the following procedure. A First, the strut assembly 4 is assembled by "hoso-assembling" the wooden strut 1, the loading 2, the back frame 3, and the like. B After turning on the upper surface of loading 2 and performing bar digging,
The sound board 8 to which the sound bar 6 and the piece 7 (long piece 7a and short piece 7b) are previously attached is adhered, and the attached sound board 8 is also attached.
Moulder the outer circumference of the pile and shape it so that it matches the outer circumference of the stack 2. C The pin plate 9 and the frame 12 are once placed on the soundboard 8, and the pieces are pressed out. Specifically, by using a jig prepared in advance, a piece pressure line is drawn to the side surface of the piece, and the upper surface of the piece 7 is ground in accordance with this piece pressure line, whereby a predetermined piece pressure can be obtained. . D After the pressing of the pieces, the frame 12 and the pin plate 9 are removed, and the pieces 7 are pierced and the pieces are pinned. In parallel with this, the removed frame 12 is painted and the hitch pin 14 and the agraph 15 are attached. E The side plate 10 formed in advance is adhered to the outer periphery of the pile 2 of the pillar assembly 4. The side plate 10 is composed of, for example, a total of 15 layers of laminated laminating plywood of Macaule's decorative veneer, and these are laminated and inserted between the outer mold and the inner mold of the press molding machine. By pressing and adhering, a shape that matches the outer shape of the loading 2 is formed. F Next, the frontage dimension of the side plate 10, that is, the dimension between the inner side surfaces of the left and right front portions of the stack 2 is adjusted. That is, the side plate 10
When the frontage dimension is smaller than the predetermined dimension with the attached, by cutting the inner surface of the loading 2,
Adjust the frontage dimension. G Arming is performed on the left and right front portions of the loading 2 and the side plate 10. Specifically, the left and right front parts of the loading 2 and the side plate 10 are
Cut each with a moulder to match the desired shape of the braces. H Next, a decorative veneer (not shown) is attached to the cut surface, and spray coating is performed by spraying on the surfaces of the side plate 10 and the stack 2 including the decorative veneer (parent coating). I Formed in advance between the lower surfaces of the left and right front parts of the side plate 10.
The painted shelf 11 is fixed. J A pin plate 9 is fixed between the left and right front portions of the stack 2 of the strut assembly 4, and the frame 12 is fixed to the strut assembly 4 while being placed on the soundboard 8 and the pin plate 9. afterwards,
Tuning pin 13 through pin plate 9 and frame 12
After burying, the string S is stretched between the hitch pin 14 and the piece 7. K Next, the top and bottom of the floor (the vertical distance from the top surface of the shelf 11 to the striking point of the string S) is measured, and the top surface of the shelf 11 is cut and adjusted so that the top and bottom of the floor are predetermined. The measurement and adjustment of the upper and lower parts of the space are performed by using a large-sized shelf planer equipped with a sensor. L The leg support 17 and the leg support seat 18 are attached sequentially, and the leg 19 and the pedal 20 are attached. M Next, the damper unit 21 is attached to the back frame 3 of the pillar assembly 4, and the keyboard 22 and the action 23 are also attached.
After the reeds 25 in which the hammers 24 have been set in advance are installed in the shelf board 11, pacing is performed. N Finally, the case parts 30 other than the side plate 10 such as the lower mouth bar 26, the time signature 27, the large roof rear 28 and the large roof front 29 are attached (with a side), and after undergoing inspections such as sound quality finishing and exterior check, Complete the assembly.

[0003]

As described above, according to the conventional assembling method, the pillar assembly 4 is used as a base, parts are sequentially attached to the pillar assembly 4, and predetermined processing and painting are performed, so that the grand piano is Can be assembled. That is, from the start to the end of the assembly, except for some of the parts that are separately prepared, the mounting and processing of the parts are performed for the column assembly 4 having a large weight and size. There is a drawback in that the handling property at the time is insufficient, and the machines and equipment for mounting and the like become large, which increases the assembly cost.

For example, since the side plate 10 is formed as a single continuous curved plate that matches the outer shape of the pile 2 of the column assembly 4, the press molding machine for that purpose inevitably becomes large in size. . For the same reason, there is no choice but to increase the size of the machine tool for performing the turning process of the loading 2 and the armboard process of the side plate 10 and the painting facility for performing the parent painting. Further, since the side plate 10 is composed of one curved plate, when the coating is performed, the coating by spraying and the drying are repeated using a paint having a relatively low flowability so that the paint does not drip. Must be repeated, and the painting process takes a very long time.

In the conventional assembling method, the pillar assembly 4
Since this is a so-called series type assembly line in which most of the steps such as mounting and processing of parts are sequentially performed on the basis of the above, it is not possible to proceed to the next step unless one step is completed. For example, after attaching the frame 12 to the column assembly 4 and burying the tuning pin 13,
Since the string is stretched, the troublesome step of burying the tuning pin 13 causes the stagnation of the assembly line, which in turn lowers the manufacturing efficiency.

Further, in the conventional assembling method, the frame 12
Is mounted on the pin plate 9, the thickness of the pin plate 9 directly affects the installation height of the string S and thus the piece pressure. For this reason, the above-described piece press-out is required, and if the thickness accuracy of the pin plate 9 is low, a great amount of labor and time are required for the piece press-out.

Furthermore, since the shelf 12 is fixed to the side plate 10, the frame 12 is attached and the string is stretched, so that the tension of the string S causes the strut assembly 4 made of wood material and the side plate 10.
Deformation such as warpage or twisting is likely to occur, and due to the influence of this deformation, the positional relationship between components, for example, the top and bottom of a groove, is likely to be greatly displaced. On the other hand, at this time, since the shelf 11 is already fixed to the side plate 10, in order to adjust the upper and lower portions of the rim, as described above, the shelf 10 is scraped using a large shelf scraper equipped with a sensor, for example. It has to be processed, which also causes an increase in assembly costs.

The present invention has been made to solve such a problem, and can greatly simplify the assembling process and improve the efficiency thereof, thereby significantly reducing the assembling cost. It is intended to provide a method of assembling a grand piano that can be performed.

[0009]

In order to achieve this object, a method of assembling a grand piano according to the present invention includes a side plate forming step of forming a side plate and a plurality of other parts on the side plate as a base. It is characterized by including a component mounting process of assembling the grand piano by sequentially mounting.

According to this structure, the side plate is used as a base, and a plurality of other parts are sequentially attached to the side plate,
The grand piano is assembled. The side plate is lighter in weight than the conventional base part, which is a pillar assembly, so that it is easier to mount and process parts, and the handleability during assembly is improved, making assembly easier. become.

In this case, it is preferable that the side plate forming step includes a side plate member forming step of individually forming a plurality of side plate members and a side plate member joining step of joining the formed plurality of side plate members to each other. . In this configuration, since the side plate is divided and configured by a plurality of side plate members, it is necessary to perform molding and processing of the side plate with a smaller size as compared with the conventional case where the side plate is formed as a single continuous plate from the beginning. Will be possible. Therefore, bending of the single plate constituting the side plate can be performed easily and efficiently, and the press forming machine for forming the side plate and other machine tools can be downsized.

In this case, it is preferable that the side plate member forming step includes a side plate member coating step of coating each of the plurality of side plate members. With this configuration, since the coating is performed in the side plate member forming step, that is, before the side plate member is assembled, the size of the coating facility can be reduced as compared with the conventional case.

In these cases, the plurality of side plate members are composed of two flat plates which form the front left and right straight portions of the side plate and one curved plate which forms the remaining part of the side plate. Is preferred. With this configuration, it becomes possible to coat two flat plates with the flow coater in a flat state, which facilitates the coating work and shortens the time.

In these cases, it is preferable that one of the component mounting steps is a soundboard unit mounting step of mounting a soundboard unit including a soundboard to a plurality of soundboard bases fixed to the inner surface of the side plate. According to this configuration, since the soundboard is attached to the sideboard via the soundboard bases fixed to the sideboard, the conventional loading that plays the role of attaching the soundboard and the sideboard is basically unnecessary, and the number of parts is reduced. Reduction can be achieved.

In this case, it is preferable that a predetermined inclined surface is formed on the upper surface of the soundboard base in advance, and the soundboard is fixed to the soundboard base while being placed on the inclined surface. According to this structure, the soundboard is given a predetermined peeling due to the inclined surface formed on the upper surface of the soundboard base. Moreover, since this inclined surface is formed in advance on each soundboard base, it can be formed relatively easily using a small machine tool.

In these cases, it is preferable to attach a reinforcing material to the inner surface of the side plate. With this configuration, the side plate is reinforced by the reinforcing material, and the lack of strength and rigidity due to the abolition of loading can be compensated for, and the required strength and rigidity of the side plate can be secured.

In these cases, the soundboard of the soundboard unit is preferably made of plywood. According to this configuration, the soundboard can be manufactured very easily and inexpensively as compared with the conventional case where the soundboard is manufactured by plate-bonding the unwound material plates and horizontally crossing.

Further, in these cases, it is preferable that the soundboard unit is provided with a piece and a soundbar attached to the front and back surfaces of the soundboard, and the piece is pierced and pinned. With this configuration, before the soundboard is attached to the side plate, the attachment of the piece and the soundbar, and the piece abutment and the piece pinning can be completed in advance. By promoting the unitization of the soundboard, it is possible to immediately proceed to the next step for the sideboard after the soundboard is attached, and the efficiency of the piano assembly can be improved.

In these cases, one of the component mounting steps is a frame unit mounting step of fixing the frame unit including the frame to the soundboard base after the soundboard unit mounting step, with the frame mounted on the soundboard. It is preferable. According to this configuration, the frame is also attached to the side plate via the soundboard base, and thus the conventional hoisting that also serves to attach the frame is completely unnecessary.

In this case, it is preferable that the frame unit includes a pin plate directly attached to the frame. In this configuration, since the pin plate is directly attached to the frame, the installation height of the strings to be tensioned on the frame later,
Therefore, the thickness of the pin plate has no effect on the bridge pressure. As a result, the thickness tolerance of the pin plate is relaxed, and a piece pressure close to the predetermined piece pressure can be obtained when the frame is attached, so that the predetermined piece pressure can be obtained by only finely adjusting the piece pressure. It is possible to abolish the troublesome pressing of the pieces due to the cutting of the conventional pieces.

In these cases, it is preferable to provide a frame bolt for adjusting the bridge pressure by adjusting the vertical distance of the frame with respect to the soundboard. With this configuration, by rotating the frame bolt, the vertical distance between the frame and the soundboard can be changed, and the piece pressure can be easily adjusted.

In these cases, it is preferable that the tuning pin is embedded in the pin plate of the frame unit.
With this configuration, since the tuning pin is embedded in the pin plate in advance as a part of the frame unit, it is possible to immediately proceed to the next step after the frame unit mounting step, and the troublesome step of burying the tuning pin is performed. The piano can be efficiently assembled without causing a stagnation in the assembly line. It is also possible to attach a hitch pin to the frame and to stretch the string loosely in advance between this and the tuning pin.
The unitization of the frame is further promoted.

In these cases, one of the component mounting steps is, after the frame unit mounting step, after the strings are stretched on the frame, the shelf board base is fixed to the inner surface of the side plate, and the shelf board is inserted through the shelf board base. It is preferable that it is a shelf plate unit attaching step of attaching the shelf plate unit including the above to the side plate. According to this configuration, since the shelf plate is attached to the side plate after the strings are stretched on the frame, even if the side plate is deformed due to warp or twist due to the tension of the strings, the side plate after the deformation is By attaching the shelf base at a predetermined height position, it is possible to accurately obtain the upper and lower sides of a predetermined rim without being adversely affected by this deformation. As a result, it is not necessary to perform the conventional shaving process using a large shaving machine for the shelves to adjust the top and bottom of the rim.

In this case, it is preferable that the shelf board base and the soundboard base are attached to respective predetermined height positions with reference to the same height reference position of the side plates. In this configuration, the shelf board and the soundboard base are attached to the shelf board base simply by installing them at predetermined height positions with reference to the height reference position set at the common position of the side plates. And the vertical distance between the string attached to the frame attached to the soundboard base has a predetermined value, that is, a predetermined space can be easily obtained from the vertical direction.

In this case, it is preferable to set the height reference position on the upper surface of the side plate and arrange the shelf plate between the inner side surfaces of the side plate. With this configuration, since the shelves are arranged between the inner surfaces of the side plates, unlike the conventional case where the shelves are arranged between the lower surfaces of the side plates, the shelves can be attached at any position in the vertical direction of the side plates. become. Therefore, the shelf plate can be easily attached to a predetermined height position with respect to the upper surface of the side plate while absorbing (releasing) deformation of the side plate.

In these cases, it is preferable that the shelf unit includes a damper unit attached to the shelf plate. With this configuration, the damper unit is configured as a part of the shelf unit, so that unitization is promoted.

In these cases, it is preferable that the shelf unit includes a reed placed on the shelf and a keyboard, an action and a hammer mounted on the reed. In this configuration, the reed, keyboard, action, and hammer are also configured as a part of the shelf unit, further facilitating unitization, and it is possible to finish the tuning including the damper unit in advance. Also, coupled with the fact that the shelf plate is accurately attached to the predetermined height position, the subsequent adjustment can be performed very easily with only minor adjustment.

In these cases, it is preferable that one of the component attaching steps is a keyboard unit attaching step of attaching the keyboard unit including the keyboard to the shelf board after the shelf board attaching step. According to this structure, the keyboard unit is assembled separately from the shelf board unit, and is attached to the shelf board after the shelf board unit is attached to the side board.

In this case, it is preferable that the keyboard unit includes a reed placed on the shelf and a keyboard, an action and a hammer mounted on the reed. With this configuration, it is possible to finish the adjustment of the portion excluding the damper unit in advance, and the adjustment can be easily performed thereafter.

[0030]

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, this grand piano is abolished from the conventional loading, and based on the side plate 10, a soundboard unit US, a frame unit UF, a string S, a shelf unit UB and Keyboard unit UK
It is assembled by directly attaching in order. Hereinafter, the method of assembling this grand piano will be described in detail in the order of steps. 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. Side Plate Forming Step As shown in FIG. 3, the side plate 10 is composed of two flat plates 10a and 10a forming straight portions on the left and right front sides, and one curved plate 10b forming the remaining curved portion of the side plate 10. It has a divided configuration. Each of the flat plate 10a and the curved plate 10b is formed of a laminated plate similar to the conventional one, for example, a laminated plate of Lauan and Macaule. According to such a divided structure, the bending process is not required for each flat plate 10a, and only the curved plate 10b is required to be bent for each single plate and laminated by a small press molding machine. Can be manufactured easily and at low cost.

The side plate 10 is assembled by the procedure shown in FIG. 2 using the flat plate 10a and the curved plate 10b formed as described above. That is, first, the curved plate 10b is coated by spray coating or the like. In this case, since the curved plate 10b to be coated is smaller than the conventional single continuous side plate, it is possible to perform coating with a small spray.

On the other hand, regarding the flat plate 10a, each flat plate 10
By cutting the front end of a with a moulder or the like, the arm part 10c having a predetermined shape is formed and coating is performed. Since the flat plate 10a is flat, this coating can be performed by a flow coater.
It is possible to easily and quickly perform coating and drying by passing 0a in a flat state and moving it through a curtain of paint having high flowability, and by using light drying with ultraviolet rays in combination. .

Next, as shown in FIG. 4, each flat plate 10a
The armboard plate 31 of the same shape, which is separately formed and painted, is adhered and screwed to the inner side surface of the armboard part 10c to complete the processing of the armboard 32. The coating of the armboard board 31 is performed by the same method as in the case of the flat plate 10a described above.

Next, the soundboard base 33 is adhered and screwed to the inner surfaces of the flat plate 10a and the curved plate 10b. The soundboard base 33 serves as a base to which the soundboard 8 and the frame 12 are attached later, and the upper surfaces of the flat plate 10a and the curved plate 10b are used as the height reference position, and a predetermined position lowered by the same predetermined height from the height reference position. Positioned and attached to. The soundboard base 33 is made of a rod-shaped wood material, has an outer surface shape that matches the inner surfaces of the flat plate 10a and the curved plate 10b, and has a predetermined shape for the soundboard 8 on its upper surface. An inclined surface 33a for giving a peeling is formed in advance. As described above, since the individual soundboard bases 33 are tilted, the working work can be performed easily as compared with the conventional method in which a large strut assembly is piled up. You can

Then, as shown in FIG. 5, two flat plates 1
The side plate 10 is formed by joining the 0a, 10a and the curved plate 10b to each other via the hinge 34 and the reinforcing block (reinforcing material) 35. The hinge 34 is made of metal, and connects the two plates 10a and 10b by being screwed to the upper portion of each joint between the flat plate 10a and the curved plate 10b. Further, the hinge 34 is formed in a special corrugated shape in order to provide decorativeness.

On the other hand, the reinforcing block 35 is made of a wood material, and is positioned and adhered to the lower side of the hinge 34 so as to be flush with the upper surface of the soundboard base 33. The lack of rigidity is compensated for to secure the required strength and rigidity of the side plate 10, and also to play a role as a mounting member for the sound board 8 together with the sound board base 33.

2. Prop / frame mounting process Next, the support 36 is attached to the side plate 10 formed as described above.
And a frame 37 such as an inner frame is attached (see FIG. 1). These columns 36 and frames 37 have a smaller role as conventional strength members, and mainly function as mounting members for related parts such as frame bolts and leg holders 19 described later. Therefore, as shown in FIG. 6, the support columns 36 are different from the conventional support columns 1 in that two columns are parallel to the front-rear direction,
One is arranged in the left-right direction, and the thickness thereof is smaller than that of the conventional column 1.

Further, a connecting fitting 38 shown in FIG. 7 is used to attach the support column 36 and the frame 37 to the side plate 10.
As shown in the figure, the connecting metal fitting 38 is arranged at a predetermined position on the lower portion of the side plate 10 and is screwed from two directions, i.e., the inner side and the lower side, and the support pillar 36 is fitted in the mounting hole 38 a of the connecting metal fitting 38. They are assembled and screwed from three directions. Therefore, the pillar 36 and the frame 3 can be carried out without performing a hoso assembly or the like.
7 can be easily and accurately and firmly attached to the side plate 10.

3. Soundboard unit mounting process Next, the soundboard unit US is mounted via the soundboard base 33.
Attach to the side plate 10. This soundboard unit US is shown in FIG.
As shown in FIG. 7, pieces (long piece and short piece) 7 are provided on the surface of the soundboard 8.
And the sound stick 6 is adhered to the back side, and the process of projecting the pieces and pinning is completed. Two soundboards 8 are taken from commercially available plywood and the outer circumference thereof is cut to form a predetermined shape that matches the inner circumference of the side plate 10. As a result, the soundboard 8 can be manufactured very easily and inexpensively, as compared with the conventional case where the soundboard is manufactured by plate-bonding the strips of material and laterally crimping. Further, the sound stick 6 is provided on the sound board 8 except for the peripheral portion thereof, so that the sound board 8 can be attached to the sound board base 33 without excavating the sound board base 33. It is like this.

Soundboard unit US constructed as described above
As shown in FIG. 9, the peripheral part of the soundboard 8 is connected to the soundboard base 3
It is attached to the side plate 10 by driving the tucker 40 through the soundboard retainer 39 while being placed on the inclined surface of No. 3. The soundboard retainer 39 holds down the soundboard 8 so that it does not float up, and also functions as a clearance gap between the soundboard 8 and the side plate 10. According to this configuration, the soundboard base 3
Since the soundboard 8 can be given a predetermined peeling by the inclined surface 3 and the soundboard base 33 is installed at the predetermined height position described above, the soundboard 8 can be accurately placed at the predetermined height position. Can be installed.

4. Frame Unit Attachment Step Next, the frame unit UF is attached to the side plate 10 via the soundboard base 33. This soundboard unit UF
As shown in FIG. 10, the frame 12 integrally cast into a predetermined shape is first painted, then the hitch pin 14 is driven in, the pin plate 9 is attached, and the tuning pin 13 is embedded in the pin plate 9. is there. Note that the conventionally used agraph has been abolished, and the chord length of the string S is restricted only by a capodastro bar (not shown). As shown in FIG. 11, the frame unit UF is configured such that the peripheral portion of the frame 12 is placed on the soundboard 8.
The soundboard base 33 is attached to the side plate 10 by screwing it with a screw (not shown). In this case, the dowel 41 is used for horizontal positioning.

As described above, since the pin plate 9 is directly attached to the frame 12, the influence of the thickness of the pin plate 9 on the installation height of the string S, which is stretched later on the frame 12, and hence the bridge pressure, is affected. Less. As a result, the thickness tolerance of the pin plate 9 is relaxed, and a piece pressure close to a predetermined piece pressure is obtained when the frame 12 is attached. Therefore, a predetermined piece pressure can be obtained only by finely adjusting the piece pressure. Therefore, it is not necessary to use the conventional troublesome piece press-out by cutting the pieces. This piece pressure adjustment is performed by, for example, penetrating the soundboard 8 and the frame 12 and the support 36.
This can be easily performed by turning a frame bolt (not shown) provided between the two to change the height of the frame 12.

Further, since the tuning pin 13 is previously embedded in the pin plate 9 as a part of the frame unit UF, it is possible to immediately proceed to the next step after the frame unit mounting step, which is a troublesome tuning pin. It is possible to efficiently assemble the piano without the burying step 13 causing a stagnation of the assembly line.

5. Stretching Step Next, the string S is wound between the tuning pin 13 and the hitch pin 14 of the frame 12 via the bridge 7, and is stretched with a predetermined tension. It is also possible to attach the strings S to the frame 12 in advance before attaching the frame 12 to the side plate 10, that is, to configure the strings S as a part of the frame unit UF.
Is loosely stretched on the frame 12 and the frame unit U
After mounting F, string it with a predetermined tension.

6. Shelf board unit mounting process Next, the shelf board unit UB is installed via the shelf board base 42.
It is attached to the flat plate 10a of the side plate 10. As shown in FIG. 12, this shelf unit UB is composed of a shelf 11, a damper unit 21 attached to the upper surface thereof, and a pedal lever 43 attached to the rear surface thereof. As shown in FIG. 13, the shelf board base 42 is composed of, for example, a pair of left and right metal fittings made of metal, and like the soundboard base 33, the upper surface of the side board 10 is used as a height reference position and its predetermined height position is set. And is screwed to the flat plate 10a. Shelf 11
Is arranged between the inner side surfaces of the flat plates 10a, 10a of the side plate 10, and is screwed between the back surfaces of the lower sides of the shelf bases 42.

According to the above construction, the shelf board 1 to the side board 10 is
Since the mounting of No. 1 is performed after the string S is stretched on the frame 12, even if the side plate 10 is deformed by warp or twist due to the tension of the string S, the side plate 10 after the deformation has a predetermined height position. By attaching the shelf board base to, the adverse effect of this deformation can be eliminated. Further, the height reference position of the shelf board base 42 is set to the upper surface of the side board 10 in common with the soundboard base 33, and the shelf board 11 is arranged between the inner side surfaces of the side board 10 to deform the side board 10. While absorbing (releasing) the shelf board base 42, the shelf board 11
Can be attached to any position in the vertical direction of the side plate 10. Therefore, the shelf 11 can be attached at a predetermined height position to accurately obtain the upper and lower sides of a predetermined space, and as a result, the conventional shaving process of a large shaving machine for the shelf can be eliminated. You can The shelf base 42 may be changed from an L metal fitting to, for example, a wooden block shape, and the shelf board 11 may be attached to the lower surface thereof so that the shelf base 42 also serves as an action crosspiece.

7. Keyboard unit mounting step Next, the keyboard unit UK is mounted on the shelf board 11. This keyboard unit UK, as shown in FIG.
The reed 25 is placed on the reed 25, the keyboard 22 mounted on the reed 25, and the action 23 with the hammer 24, and their rectification is completed. According to this structure, the shelf board 1 can be obtained by finishing the adjustment of the portion excluding the damper unit 21 in advance.
Coupled with the fact that 1 is mounted at a predetermined height position with high accuracy, the pacing after mounting the unit can be easily performed with only minor adjustment.

The shelf unit UB and the keyboard unit U
It is also possible to configure K as one unit,
That is, on the shelf board 11, the damper unit 21, the reed 25,
The keyboard 22, the action 23, and the hammer 24 may be attached, and the adjustment including the damper unit 21 may be performed in advance. As a result, unitization is further promoted, and adjustment after unit attachment can be performed more easily.

8. Case component mounting step Next, the case component 44 other than the side plate 10, that is, the small components such as the lower mouth bar 26 and the time signature 27, and the large roof rear 28.
And 29 in front of the big roof. In this case, as shown in FIG. 15, with respect to the time signature 27, the upper corner portion on the side plate 10 side is notched in an R shape, which causes a gap as shown in FIG. But you can make this unnoticeable. This effect allows the gap between the time signature 27 and the side plate 10 to some extent, so that the physical matching work that has been conventionally performed to eliminate this gap can be eliminated.

9. At the end of the finishing process, the final adjustment is performed, the exterior piano is checked, and the assembly of the grand piano is completed.

As described above, according to the grand piano assembling method of this embodiment, the side plate 10 is used as the base and the side plate 1 is used.
0 and other parts in sequence, and side plate 10
Since the structure is divided, the handling at the time of assembly is improved, the overall work can be facilitated, and the machines and equipment can be downsized. Further, since the main parts to be attached to the side plate 10 are unitized as the soundboard unit US, the frame unit UF, the shelf unit UB and the keyboard unit UK, these units are separated from the side plate 10,
By assembling them independently, it is possible to significantly improve the efficiency of the assembly process.

Further, among the conventional steps and parts shown in FIG. 16, those surrounded by broken lines show those which are abolished or greatly simplified by the assembling method of this embodiment. According to the method, as compared with the conventional assembling method, the assembling process and parts can be greatly simplified.

The present invention is not limited to the embodiment described above, and can be carried out in various modes, such as the specific method of each step illustrated, the material, number and shape of the parts used. Can be appropriately changed without departing from the spirit of the present invention.

[0055]

As described above, the method of assembling a grand piano according to the present invention can greatly simplify the assembling process and increase the efficiency thereof, thereby significantly reducing the assembling cost. And so on.

[Brief description of drawings]

FIG. 1 is a process diagram schematically showing an assembly method for a grand piano according to an embodiment of the present invention.

FIG. 2 is a process drawing showing a configuration of a side plate and an assembly procedure.

FIG. 3 is a plan view of a side plate.

FIG. 4 is a perspective view showing arms of a side plate.

FIG. 5 is a perspective view showing a configuration of a joint portion of a side plate.

FIG. 6 is a plan view showing side plates and columns.

FIG. 7 is a perspective view showing a mounting state of a support column on a side plate.

FIG. 8 is a process diagram showing a configuration and an assembling procedure of a soundboard unit.

FIG. 9 is a front view showing how the soundboard unit is attached to the side plate.

FIG. 10 is a process drawing showing the configuration and assembly procedure of the frame unit.

FIG. 11 is a front view showing how the frame unit is attached to the side plate.

FIG. 12 is a process diagram showing a configuration and an assembling procedure of a shelf unit.

FIG. 13 is a front view showing how the shelf unit is attached to the side plate.

FIG. 14 is a process diagram showing the configuration and assembly procedure of a keyboard unit.

FIG. 15 is a front view of a time signature tree and its surroundings.

FIG. 16 is a process diagram showing a conventional method of assembling a grand piano.

FIG. 17 is a perspective view showing the appearance of a conventional grand piano.

FIG. 18 is a side sectional view of a conventional grand piano.

FIG. 19 is a plan view of a conventional grand piano.

[Explanation of symbols]

 6 sound bar 7 piece 8 sound board 9 pin board 10 side board 10a flat board 10b curved board 11 shelf board 12 frame 13 tuning pin 21 damper unit 22 keyboard 23 action 24 hammer 25 reed 33 sound board base 33a inclined surface 35 reinforcing block 42 shelf board Base S String US Soundboard unit UF Frame unit UB Shelf board unit UK Keyboard unit

Claims (20)

[Claims] 1. A side plate forming step of forming a side plate, and a part mounting step of assembling a grand piano by sequentially mounting a plurality of other parts to the side plate using the side plate as a base. How to assemble a grand piano. 2. The side plate forming step includes a side plate member forming step of individually forming a plurality of side plate members, and a side plate member joining step of joining the formed plurality of side plate members to each other. Claim 1 characterized by
The method for assembling the grand piano described in. 3. The method for assembling a grand piano according to claim 2, wherein the side plate member forming step includes a side plate member coating step of coating each of the plurality of side plate members. 4. The plurality of side plate members are composed of two flat plates forming straight portions on the front and left sides of the side plate and one curved plate forming the remaining portion of the side plate. The method for assembling a grand piano according to claim 2 or 3, characterized in that. 5. A soundboard unit mounting step for mounting a soundboard unit including a soundboard to a plurality of soundboard bases fixed to an inner surface of the side plate, wherein one of the component mounting steps is a soundboard unit mounting step. A method for assembling a grand piano according to any one of claims 1 to 4. 6. The soundboard base according to claim 5, wherein a predetermined inclined surface is formed in advance on the upper surface of the soundboard base, and the soundboard is fixed to the soundboard base while being placed on the inclined surface. How to assemble the described grand piano. 7. The method of assembling a grand piano according to claim 5, wherein a reinforcing material is attached to the inner surface of the side plate. 8. The method for assembling a grand piano according to claim 5, wherein the soundboard of the soundboard unit is made of plywood. 9. The soundboard unit comprises a piece and a soundbar respectively attached to the front and back surfaces of the soundboard, and the piece is pierced and piece pinned. 9. The method for assembling a grand piano according to any one of 5 to 8. 10. The frame unit mounting, wherein one of the component mounting steps is to fix the frame unit including a frame to the soundboard base after the soundboard unit mounting step, with the frame mounted on the soundboard. The method for assembling a grand piano according to any one of claims 5 to 9, which is a step. 11. The method of assembling a grand piano according to claim 10, wherein the frame unit includes a pin plate directly attached to the frame. 12. The ground according to claim 10, further comprising a frame bolt that adjusts a piece pressure by adjusting a vertical distance of the frame with respect to the soundboard. How to assemble a piano. 13. A tuning pin is embedded in the pin plate of the frame unit,
The method for assembling the grand piano according to claim 11. 14. One of the component mounting steps is, after the frame unit mounting step, after stringing the strings on the frame, fixing a shelf board base to an inner side surface of the side plate, and through the shelf board base. The method of assembling a grand piano according to any one of claims 10 to 13, wherein the step of attaching a shelf unit including a shelf to the side plate is a shelf unit attaching step. 15. The shelf base and the soundboard base are attached to respective predetermined height positions with reference to the same height reference position of the side plate. How to assemble a grand piano. 16. The method of assembling a grand piano according to claim 15, wherein the height reference position is set on the upper surface of the side plate, and the shelf plate is arranged between the inner side surfaces of the side plate. . 17. The method of assembling a grand piano according to claim 14, wherein the shelf board unit includes a damper unit attached to the shelf board. 18. The shelf unit comprises a reed placed on the shelf, and the keyboard, action and hammer mounted on the reed. 18. A method for assembling a grand piano according to any one of 1 to 17. 19. The keyboard unit mounting step of mounting a keyboard unit including a keyboard on the shelf plate after the shelf plate unit mounting step, in one of the component mounting steps. The method for assembling the grand piano according to any one of 1. 20. The keyboard unit according to claim 19, wherein the keyboard unit includes a reed placed on the shelf and the keyboard, an action and a hammer mounted on the reed. How to assemble a grand piano.