JPH01102597A - Manufacture of sound box - Google Patents

Abstract

PURPOSE: To eliminate the need for materials having excellent workability and the skilled technique in woodworking and to reduce the cost by forming many parallel cut grooves only on the plate material affixed to one surface of a flexible sheet and cutting the plate material in a direction orthogonal with the cut grooves, thereby forming a flexible side body member of a specified width. CONSTITUTION: The rigid plate material 2 is affixed to the paper 1b surface of the flexible sheet 1 formed by superposing and adhering stiff paper 1b contg., for example, carbon fibers, on a sheet 1a and is sawed by a sawing machine, by which the parallel cut grooves 3 are formed on only the sheet material 2. The sheet is then cut in the direction orthogonal with the cut grooves 3 to form the flexible side body member 4 of the specified width. A pair of the side body members 4 are bent with the plate materials 2 on the inner side and both ends thereof are joined by disposing a tail block 5 and a head block 6 on the inner side. As a result, the need for the skill for bending and the good- quality materials is eliminated and the manufacturing cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a sound box for a stringed instrument such as a guitar.

[Conventional technology and its problems] To make a guitar sound box,
Conventionally, as shown in FIG. 6, side body plate members too and t having a thickness of about 2.5 Ill. have excellent bending workability.

The plate member to
o, edge member 102, 103 curved in the same shape as tot
, and both ends of the plate members 102 and 103 are adhered to the wooden tail block 104 and head block 105, respectively, and then the front plate 106 and back plate 107 are attached thereto as shown in FIG. However, the plate member 10
Bending 0.101 requires skill and labor, and also requires high-quality materials, resulting in a significant increase in manufacturing costs. Conventionally, relatively inexpensive mass-produced guitars use press molds to heat and press the plate members 100 and 101 to shape them into the desired curved shape, thereby increasing productivity without requiring skill. However, in addition to the problem of requiring capital investment in molds, there was also the problem that molding with molds could only produce products with a constant curved shape, making it impossible to create unique products.

[Means for Solving the Problems] This invention attempts to solve each of the above-mentioned problems by attaching a thicker and more rigid plate material to one side of a flexible sheet such as a thin plate or paper, and A large number of parallel cutting grooves are formed only on the plate material at regular or irregular intervals, and the plate material and flexible sheet are cut in a direction perpendicular to the cutting grooves to form a flexible side body member of a constant width. A method for manufacturing a sound box for a stringed instrument such as a guitar, comprising bending the side body member into a desired shape with the plate material inside, and bonding both side edges of the side body member to the inner surfaces of a top plate and a back plate, respectively. It is.

[Embodiment] Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 5 for a folk guitar. First, as shown in Fig. 1, one part of a flexible sheet 1 is made by polymerizing and bonding a strong paper 1b containing carbon fiber to a thin plate 1a with a thickness of about 0.51 mm. A rigid plate material 2 having a thickness of about 5III is attached. Then, this is cut into a width of 21 mm by sawing only the plate material 2.
Form parallel cutting grooves 3.3. The spacing between the cutting grooves 3, 3, . In this way, the cutting grooves 3, 3.
. . is cut in a direction perpendicular to the cutting grooves 3, 3, . However, the side body member 4 of the lever
As shown in FIGS. 3 and 4, a pair of dill blocks 5. The head block 6 is placed inside and joined. At this time, the side body member 4 can be freely bent into a desired shape, so it can take a curved shape according to the user's preference.
Since the curvature of the part can be increased without difficulty, a more natural shape can be taken. Once the shape of the side body member 4 is determined in this way, the outer shapes of the top plate 7 and the back plate 8 are cut out according to the planar shape, adhesive is applied to both side edges of the side body member 4, and the top plate 7 is attached. and back plate 8 are pasted together. A rod (not shown) is attached to the head block 6.

Although the flexible sheet 1 shown in this example was made by polymerizing the thin plate 1a and the paper 1b, the flexible sheet does not necessarily have to have a polymeric structure and may be made of a synthetic resin sheet or other flexible sheet. can also be used. Furthermore, although this embodiment has been described with respect to a folk guitar, the present invention can be widely applied to a method of manufacturing a sound box for stringed instruments other than folk guitars.

[Effects of the Invention] As described above with respect to the embodiments, the present invention has the following effects.

(a) Costs can be reduced because it can be manufactured without requiring skilled woodworking techniques for bending.

(b) Material costs can be reduced by making side body parts without having to choose materials with excellent workability as in the past.

(c) There is no need for a press die for bending as in the past, so there is no equipment cost.

(d) Since the side body can be freely bent, stringed instruments with unique sound boxes tailored to the user's tastes can be provided at low cost, and even if a wide variety of products are produced in small quantities, costs will not increase.

(e) Since the top plate and the 1& plate are directly joined by rigid plates separated by cutting grooves, a so-called firm sound can be obtained in terms of acoustics.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of this invention.
Figure 1 is a perspective view of a flexible sheet with plate materials pasted on it, Figure 2 is a perspective view of the flexible side body member being cut after forming cutting grooves thereon, and Figure 3 is an assembly of the side body member. A perspective view showing the state;
FIG. 4 is an enlarged horizontal sectional view of a part of FIG. 3, and FIG. 5 is a partial sectional view of the sound box. FIG. 6 is a perspective view showing an assembled state of a conventional side body, and FIG. 7 is a partial sectional view of a conventional sound box. °1...Flexible sheet, 2...Plate material, 3...
- Cutting groove, 4... Side body member, 5... Tail block, 6... Head block, 7... Top plate, 8
...Back board. Figure 8 Figure 4

Claims (1)

[Claims] A thicker and more rigid plate material is pasted on one side of a flexible sheet such as a thin plate or paper, and a large number of parallel cutting grooves are formed at regular or irregular intervals only on the plate material. A flexible side body member having a constant width is formed by cutting the flexible sheet in a direction orthogonal to the cutting groove, and the side body member is bent into a desired shape with the plate material inside, so that both side edges of the side body member are bent. A method for manufacturing a sound box for a stringed instrument such as a guitar, characterized by adhering to the inner surfaces of a top plate and a back plate, respectively.