JPH0934443A - Assembling method of upright piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain improvement of production efficiency and downsizing of production facility and facilitate a conditioning work by connecting an assembled back unit and an assembled case unit with each other. SOLUTION: A back unit BU having a frame 10 stretchedly provided with strings S and actions 17 is assembled. Next a case unit CU having a case material 21, a shelf board 15, and a keyboard 16 is assembled. Next the assembled back unit BU and the assembled case unit CU are connected with each other. By this assembling method, at least the back unit BU having the frame 10 stretchedly provided with strings S and the actions 17, and the case unit CU having the case material 21, the shelf board 15, and the keyboard are respectively unitized. Consequently, these units can be separately assembled in parallel, and hence production efficiency is improved. Further, both units can be assembled dispersedly on separate places, and hence they can be assembled in smaller production facilities than the customary one.

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. 5 shows a general procedure for assembling a conventional upright piano. Hereinafter, a conventional assembling method of the upright piano will be described with reference to FIG. 4 and FIG. 4 showing a configuration after assembly. First, the pillar assembly 4 is assembled from the pillar 1, the base 2, the girder 3, and the like. After mounting the turn-around 5 on the strut assembly 4, the sound board 8 to which the sound stick 6 and the piece 7 are bonded and the pin board 9 are installed. A frame 10 in which a hitch pin 12 is embedded is attached to the strut assembly 4, a tuning pin 11 is embedded in the pin plate 9 via the frame 10, and then a string S is stretched between the hitch pin 12 and the string S. A base plate 14 to which arms (not shown) are fixed is attached to both sides of the column assembly 4, and a shelf board 15 is supported between the arms. The keyboard 16 is placed on the shelf board 15, and the action 17 is attached. In this case, the action 17 is supported by the center rail 19 attached to the action bracket 18, as shown in FIG. 4, and the action bracket 18 is placed on the action base (not shown) fixed to the shelf board 15. At the same time, the upper end portion is fixed to the frame 10 by the action bolt 20. Tuning (adjusting the functions of the keyboard and action to perform proper string striking) and tuning. Finally, the roof 21a, the upper front plate 21b and the lower front plate 21c
The case member 21 other than the parent board 14 is attached, and after finishing the sound adjustment and inspection, the assembly is completed.

[0003]

However, in the above-described conventional assembling method, the strut assembly 4 is used as a base, and various kinds of components, that is, the sound board 8, the pin board 9, the frame 10, the tuning pin 11 are added thereto. , String S, parent board 14, shelf board 1
5, keyboard 16 and action 17, etc. in series,
It is a method of mounting. Therefore, each mounting process must be performed after the completion of the previous process, and if a time-consuming process such as the mounting of the tuning pin 11 is in the middle, the time from the start of assembly to the completion thereof is correspondingly increased. Will be longer and production efficiency will decrease. Also, for the same reason,
Assembling a conventional upright piano is usually performed by collecting all the parts in one place and collectively. 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.

Further, in the conventional assembling method, a large number of parts are sequentially mounted on the basis of the strut assembly 4, so that the manufacturing error of each part is different between the parts mounted in the first part and the parts mounted in the latter part. Due to the accumulation of mounting errors and mounting errors, the positional relationship between the parts is likely to be greatly deviated, and the adjustment is difficult to perform, which is very troublesome.
In particular, focusing on the relationship between the string S, the keyboard 16 and the action 17, which greatly influence the quality of the piano, the string S
Is attached to the strut assembly 4 through the frame 10, and the keyboard 16 is provided on the shelf board 15 that is sequentially attached to the strut assembly 4 through the main plate 14 and the arms, and the action 17 is the strut assembly. It is supported across the article 4 and the shelf plate 15. Therefore, the string S and the keyboard 1
In many cases, the positional relationship between the three persons of 6 and action 17 is greatly deviated immediately after attaching them, which results in a large amount of labor and time being spent for the pacing work thereafter, which increases the cost. Is one of the major factors.

The present invention has been made in order to solve the above problems, and it is possible to improve the production efficiency, downsize the production equipment, and easily perform the adjusting work. It is an object of the present invention to provide a method of assembling.

[0006]

In order to achieve the above object, the method for assembling an upright piano according to claim 1 of the present invention comprises a back unit assembling step of assembling a back unit having a frame in which strings are stretched and an action. ,
The method is characterized by including a case unit assembling step of assembling a case unit having a case material, a shelf board and a keyboard, and a unit connecting step of connecting the assembled back unit and case unit to each other.

According to this method of assembling the upright piano, at least the back unit having the frame in which the strings are stretched and the action, and the case unit having the case material, the shelf board and the keyboard are unitized. Therefore, it is possible to assemble these units separately and in parallel, which improves production efficiency. In addition, since both units can be assembled in separate places, the unit can be assembled in a smaller production facility as compared with the conventional one.

Further, it becomes possible to adjust the relationship between the respective constituent parts for each unit, and if such adjustment is appropriately performed in advance, the positional relationship between both units can be properly adjusted at the time of connection. Only by doing so, the positional relationship between the constituent parts of both units, particularly the three of the strings, the action and the keyboard, have a predetermined positional relationship, so that the pacing work can be easily performed.

According to a second aspect of the present invention, in the assembling method of the upright piano according to the first aspect, the back unit assembling step includes an action adjusting step of adjusting the action to a predetermined position with respect to the strings. It is characterized by that.

In this assembling method, since the action is adjusted in advance to a predetermined position with respect to the strings in the action adjusting process of the back unit assembling process, the keyboard is brought into a predetermined position with respect to the action in the unit connecting process later. As described above, by simply connecting the back unit and the case unit while positioning each other, the three members of the string, the action, and the keyboard can be easily adjusted to an appropriate positional relationship, and the adjustment work can be performed more easily.

Further, the assembling method of the upright piano according to claim 3 is the assembling method according to claim 2, wherein the keyboard is provided with a capstan, and the keyboard is located at a predetermined position in the front-rear direction with respect to the action in the unit connecting step. As described above, it is preferable that after the back unit and the case unit are connected to each other while being positioned in the front-rear direction, the height relationship of the keyboard and the action is adjusted by adjusting the height of the capstan.

In this assembling method, in the unit connecting step, the back unit and the case unit are connected while being positioned in the front-rear direction so that the keyboard is located at a predetermined position in the front-rear direction with respect to the action.
At the time of this connection, the position adjustment in the front-back direction between the keyboard and the action is completed at one time. After that, by adjusting the height of the capstan, the vertical positional relationship between the individual keyboards and the action is adjusted appropriately, so the pacing work is further enhanced.
It can be done easily.

[0013]

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.
FIG. 2 shows an assembling process of the upright piano to which the present invention is applied, and FIG. As shown in both figures, in the assembly method of this embodiment, the upright piano is
It is roughly divided into a back unit BU and a case unit CU,
Both units BU and CU are separately and independently assembled and then connected to each other to be assembled into the completed piano shown in FIG. In the following description, common reference numerals will be used for those components that are common to those already described in FIG.

The back unit BU includes a column assembly 4, a soundboard 8, a pin plate 9, a frame 10 and a tuning pin 1.
It consists of 1, action 17 and string S,
As shown in FIG. 1, it is assembled as follows (back unit assembling step). First, the pillar assembly 4 is assembled from the pillar 1, the base 2, the girder 3, and the like. After mounting the turn-around 5 on the strut assembly 4, the sound board 8 to which the sound stick 6 and the piece 7 are bonded and the pin board 9 are installed. A frame 10 in which a hitch pin 12 is embedded is attached to the strut assembly 4, a tuning pin 11 is embedded in the pin plate 9 via the frame 10, and then a string S is stretched between the hitch pin 12 and the string S. Next, the action 17 is attached to the frame 10 via the center rail 19, the action bracket 18, and the action bolt 20. Finally, the action 17 is adjusted to a predetermined position with respect to the string S (action adjusting step), and the assembly of the back unit BU shown in FIG. 2A is completed. This action adjustment is performed, for example, by adjusting the hammer line in which the hammer 17a of the action 17 hits the string S to a predetermined height.

On the other hand, the case unit CU includes a case member 21 including a pair of left and right main plates 14, a shelf plate 15, and a keyboard 1 with a capstan screw (capstan) 16a.
6 and pedal parts 22 and the like, and is assembled in the following procedure in parallel with the assembly of the back unit BU (case unit assembly process). First, the shelf board 15 is supported between the arms fixed to the parent boards 14 and 14, respectively, and the parent boards 14 and 14 include the wife base 21d and the front base 21e of the other case materials 21.
The shelf support columns 21f, the roof 21a, etc. are attached to make a self-supporting framework. Next, the keyboard 16 is placed on the shelf board 15 via the reeds 23. In this case, the shelf plate 15 is preferably made of metal such as an iron plate in order to obtain high manufacturing dimensional accuracy and dimensional stability. Further, at this time, the reed 23 and the keyboard 16 are adjusted to a predetermined position with respect to the shelf board 15. For this position adjustment, for example, reference holes (not shown) are previously formed at predetermined positions of the shelf plate 15 and the reed 23, and the reference holes are aligned with each other, and then the positioning pin 24 is passed between them. It is done by Thereby, the keyboard 16 can be adjusted to a predetermined position with respect to the master board 14 and the shelf board 15. Finally, the pedal 22a, the balance 22b, and the lifting rod 22c.
Pedal parts 22 such as, and the upper front plate 21b and the lower front plate 2
2c is attached with the remaining case material 21 such as 1c.
The assembly of the case unit CU shown in is completed.

Next, the back unit BU and the case unit CU assembled as described above are connected to each other (unit connecting step). In this connection, as shown in FIG. 2, the back unit BU and the case unit CU are opposed to each other, the former BU is fitted into the latter CU, and the main plate 14 and the pillar 1 of the pillar assembly 4 are screwed. It is done by Further, before this screwing, both units BU and CU are arranged so that the keyboard 16 is located at a predetermined position in the front-rear direction with respect to the action 17.
For example, as shown in FIG. 3, the front-rear direction is positioned such that the front-rear distance L between the front surface of the shelf 15 and the striking position of the hammer 17a, that is, the "front-back position" has a predetermined length. To be done. As a result, all keys 16
The action 17 and the string S can be accurately adjusted to a predetermined position in the front-rear direction. Next, by adjusting the height of the capstan screw 16a, the vertical positional relationship between each keyboard 16 and the corresponding action 17 and string S is properly adjusted.

After that, other tuning work and tuning work are performed, and after the tuning work and inspection, the assembly of the upright piano is completed.

As described above, according to the assembling method of the upright piano described above, the back unit BU having the frame 10 with the string S stretched and the action 17, the case member 22, the shelf board 15 and the keyboard 16 are provided. Since the case unit CU and the case unit CU can be separately assembled in parallel, the production efficiency can be improved. Further, since the assembly of both units BU and CU can be performed separately in different places, it becomes possible to assemble with a small production facility as compared with the conventional one.

Further, in this assembling method, the action 17 and the strings S are adjusted in advance to an appropriate positional relationship on the back unit BU side, and the keyboard 16 is set to a predetermined position on the main board 14 and the shelf board 15 on the case unit CU side. Adjust it to the position in advance, and when connecting both units BU and CU,
Both units BU and CU are connected while positioning each other in the front-rear direction so that the keyboard 16 is located at a predetermined position in the front-rear direction with respect to the action 17. Therefore, when connecting both units BU and CU, the keyboard 16 and the action 1
The position adjustment in the front-back direction between 7 can be completed at one time. Since the vertical positional relationship between each keyboard 16 and the corresponding action 17 can be adjusted by the subsequent height adjustment of the capstan 16a, the pacing work can be performed extremely easily.

The present invention is not limited to the embodiment described above and can be implemented in various forms.
For example, the specific assembling procedure of each of the back unit and the case unit is not limited to the one described above, and can be arbitrarily changed. In addition, the configuration of the details can be appropriately changed without departing from the spirit of the present invention.

[0021]

As described in detail above, the method of assembling the upright piano of the present invention has the advantages that the production efficiency can be improved, the production facility can be downsized, and the pacing work can be easily performed. have.

[Brief description of drawings]

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

FIG. 2 is a side cross-sectional view of the back unit and the case unit before they are connected by the assembling method of FIG.

FIG. 3 is a plan view schematically showing a positioning method when connecting the back unit and the case unit of FIG.

FIG. 4 is a side sectional view of an upright piano.

FIG. 5 is a process diagram showing a method for assembling a conventional upright piano.

[Explanation of symbols]

 10 frame 14 parent board 15 shelf board 16 keyboard 16a capstan screw 17 action 21 case material S string BU back unit CU case unit

Claims (3)

[Claims] 1. A back unit assembling step of assembling a back unit having a string-stretched frame and an action, a case unit assembling step of assembling a case unit having a case material, a shelf plate and a keyboard, and the assembled back unit and A unit connecting step of connecting the case units to each other, and a method of assembling an upright piano. 2. The back unit assembling step comprises an action adjusting step of adjusting the action to a predetermined position with respect to the strings.
The method for assembling the upright piano described in. 3. The keyboard includes a capstan, and in the unit connecting step, the back unit and the case unit are mutually forward and backward so that the keyboard is located at a predetermined position in the front and rear direction with respect to the action. After connecting while being positioned to, by adjusting the height of the capstan, to adjust the vertical positional relationship between the keyboard and the action,
The method for assembling the upright piano according to claim 2.