JPH09179551A - Method for coating back lid of grand piano and its chamfer part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a smooth coating at low cost even when the chamfer part is provided. SOLUTION: The core material of the grand piano back lid 22 is a particle board 2 which is inexpensive and hard to form a smooth coating surface, but its entire surface is covered with phenol backers 4 and 18 and corner members 14 through easy operation, so that the part where the particle board 2 forms an external surface is never coated. Further, the beveled part 16 and top surface 14b of the corner member 14 are coated as external surfaces, but the corner members 14 are formed of coniferous timber or lauan, so a sufficiently smooth coating surface can easily be formed, and this coating surface which is smooth enough can be formed without taking a time as compared with a case wherein the surface of the particle board 2 is merely coated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grand roof for a grand piano and a method for coating a chamfered portion thereof.

[0002]

2. Description of the Related Art Large roofs for grand pianos are usually formed by using veneer wood or plywood. In particular, particle boards, fiber boards, and the like are used as inexpensive materials for cost reduction.

When wood is used for the grand roof for grand pianos, the grand roof for grand pianos must be finished by painting so that its surface is smooth. However, when the particle board or fiber board is used for cost reduction, the surface is extremely rough, so the paint easily penetrates during painting, and it is impossible to finish the surface smoothly by painting. It has to be applied or has to be painted over and over again, resulting in very poor workability.

For this reason, the surface of the molded grand piano roof has been pre-treated with a surfacer (surface treatment agent) for making it difficult for the paint to penetrate, and then coating is performed. Also, for particle boards, etc., which have a rough surface that cannot be painted smoothly by just applying surfacer a few times, apply a decorative material such as phenol backer, which is a resin-impregnated paper, as a surface material on the surface before painting. Was there.

However, as shown in FIG. 6, a chamfered portion 102 is formed at a corner portion on the surface 100a side of the outer peripheral edge (shown by a region S in the drawing) of the grand piano large roof 100 to produce a design effect. Sometimes you want to. However, the decorative material could not be attached to the chamfered portion 102.

That is, when a grand roof for a grand piano is manufactured by using a material having a rough surface, for example, a particle board, as shown in FIG. 7A, the surface of the particle board 104 molded into the outer shape of the grand roof for a grand piano. The decorative material 106 is attached to the surface 104a and the back surface 104b with an adhesive. Alternatively, after the decorative material 106 is attached to both the front and back surfaces 104a and 104b of the particle board 104 with an adhesive, the outer shape of the grand roof for a grand piano is formed.

Thereafter, as shown in FIG. 7B, the corner portion 108 of the outer peripheral edge on the surface 104a side forming the chamfered portion is
It cuts by the rotary cutter 110, and the chamfered part 102 is formed like FIG.7 (c). Here, the end surface 109 of the particle board 104 is also cut at the same time.

Finally, the paint is applied to the entire surface to finish, but in the state shown in FIG. 7C, the end surface 109 of the particle board 104 and the chamfered portion 102 are rough surfaces, so that the decorative material 106 is used. Need to be covered.

[0009]

The end face 109 can be completely covered by adhering a tape-like decorative material 106, but the chamfered portion 102 has an arc-shaped cross section as shown in the drawing. As shown in a region S of 6, a curved line is drawn and arranged on the outer peripheral edge of the grand roof 100 for a grand piano. Therefore, the chamfered portion 102 has a three-dimensionally curved shape and cannot be completely covered with the planar decorative material 106.

Further, the chamfered portion 102 has a linear or other cross section, and if the planar decorative material 106 can be theoretically covered, it can be completely covered. It is very time-consuming and extremely expensive to form the decorative material 106, and cannot be adopted in actual manufacturing.

Therefore, in order to adopt the design of forming the chamfered portion on the grand roof for grand pianos, it is not possible to use a material having a rough surface such as particle board as the core material, and a single plate of softwood having a high material cost. Alternatively, it was necessary to use plywood. Alternatively, it was necessary to use a lauan veneer or plywood that was slightly soaked with paint but could be suppressed with a surfacer.

An object of the present invention is to provide a grand roof for a grand piano on which a smooth coating is formed and a method for coating the chamfered portion thereof, at a high cost even if the chamfered portion is provided.

[0013]

Means for Solving the Problems and Effects of the Invention A large roof for a grand piano of the present invention comprises a core material made of a material which is difficult to form a smooth coating surface, and smooth coating surfaces on both front and back surfaces of the core material. A grand roof for a grand piano using a plate material made of a material or a surface material using a decorative material, which is easy to form, and corner members that easily form a smooth painted surface are arranged at the corners of the outer peripheral edge. The chamfered portion of the corner member is painted.

That is, the grand roof for a grand piano is made of a material that does not easily form a smooth coated surface as the core material, instead of using a material that makes it easy to form a smooth coated surface as the core material of the grand piano. The structure adopts a structure in which corner members that facilitate the formation of a smooth painted surface are arranged at the corners of the outer peripheral edge. The chamfered portion is formed by cutting this corner member.

Therefore, the formed chamfered portion can be coated as it is without using a decorative material, or a sufficiently smooth coated surface can be formed by a small number of pretreatments of the surfacer. As described above, even if the chamfered portion is provided, the large roof for a grand piano of the present invention is not expensive, and a smooth coating is formed as a whole.

Examples of the material that does not easily form a smooth coated surface include particle board and fiber board. Examples of the corner members include wood such as conifers and lauan. As the form of the corner member, for example, a laminated body of wood veneer is used for mounting along the corner portion of the outer peripheral edge of the grand roof for grand piano. This laminated body may be attached to the corner of the outer peripheral edge of the grand piano large roof after being formed into a shape along the outer peripheral edge of the grand piano large roof,
The wood veneer may be laminated at the same time when it is attached to the corner portion of the outer peripheral edge of the grand piano large roof.

The method for coating the chamfered portion of the large roof for the grand piano is performed as follows, for example. That is,
The corner of the outer edge of the grand roof for a grand piano is shaved larger than the shape of the chamfer, and the chamfered part is embedded and fixed with a corner member that easily forms a smooth painted surface. Cut into a predetermined shape including the shape, and paint the cut part.

In particular, if the corner member is a laminated body of wood veneer, it can be easily formed into a shape along the scraped portion.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment] FIGS. 1 to 3 show steps of manufacturing a grand roof for a grand piano according to an embodiment. First, as shown in FIG. 1 (a), on the front surface 2a and the back surface 2b of a particle board 2 processed into the outer shape of a grand roof for a grand piano, a decorative material as a surface layer material, here, a phenol backer (phenol resin impregnated paper) is used. 4 with adhesive agent
Stick as shown in (b).

Next, by the rotary cutter 8 of the NC machine tool shown by the chain double-dashed line in FIG. 1 (b), the scraping portion 12 having a rectangular cross section of the corner portion 6 of the outer peripheral edge on the surface 2a side is formed. , The end surface 10 of the particle board 2 is scraped off, as shown in FIG.
The state of (c) is obtained. The scraping portion 12 is formed to be larger than the chamfering portion 16 described later. A perspective view of this state is shown in FIG.

Next, as shown in FIG. 5, the scraping portion 12
The corner member 14 in which a plurality of coniferous trees such as spruce or veneer lauan are laminated in a shape along with is arranged in the scraping portion 12 and fixed by an adhesive to obtain the state of FIG. 2 (d). The corner member 14 is slightly larger than the scraping portion 12.

Next, NC shown by a chain double-dashed line in FIG.
The end face 10 side is cut by another rotary cutter 15 of the machine tool. This rotary cutter 15 chamfers the corner portion 14a on the side of the corner member 14 into an arc shape according to its shape,
6 is formed. Next, as shown in FIG. 2E, a tape-like phenol backer 18 is attached to the end surface 10 with an adhesive except the chamfered portion 16, and the surface is smoothed in this state. In order to increase the height, sandpaper is applied to the whole and the state of FIG. ,
After that, coating is performed, and as shown in FIG. 3 (g), the grand roof 22 for the grand piano whose entire surface is covered with the paint layer 20 is completed.

The core material of the large roof 22 for the grand piano is the particle board 2 which is difficult to form a smooth painted surface, but since the entire surface is covered with the phenol backers 4, 18 and the corner member 14, the particle board 2 There is no painting on the outer surface. Moreover,
It is easy to attach the phenol backers 4, 18 and the corner member 14.

The chamfered portion 16 and the upper surface 14b of the corner member 14 are coated as outer surfaces, and the corner member 14 is a softwood or a lauan. In particular, a softwood such as spruce can form a sufficiently smooth coated surface even when it is coated as it is with the sandpaper. With regard to Lauan, if the surfacer is applied at least once or twice, it is possible to form a sufficiently smooth painted surface, which is more troublesome than when the surface of the particle board 2 is simply painted. A sufficiently smooth painted surface can be formed.

[Others] In the above-described manufacturing process of the grand roof 22 for a grand piano, the phenol backer 4 was first attached to the front surface 2a and the back surface 2b of the particle board 2, but not first, but in FIG. 2 (e). At the stage, the phenol backer 4 may be attached to the front surface 2a and the back surface 2b of the particle board 2 together with the phenol backer 18 attached to the end surface 10.

Instead of the particle board 2, another material such as a fiber board can be used as long as it is a material which is hard to form a smooth coated surface but is inexpensive. Further, the corner member 14 may be made of another material as long as it is a material that easily forms a smooth painted surface.

Further, the chamfered portion 16 has a shape in which the cross section is recessed in an arc shape, but other cross sectional shapes can be applied as in the above-described embodiment. In addition, the chamfered portion is the surface 2
When forming not only on the a side but also on the corner portion of the outer peripheral edge on the back surface 2b side, the entire end surface 10 of the particle board 2 is covered with a corner member wider than the corner member 14 shown in FIG. If the chamfered portions 16 are formed at both corners of the outer peripheral edge of the front surface 2a and the back surface 2b as described above and the coating is performed, the material cost is low and a sufficiently smooth coated surface can be formed without trouble.

In the above-mentioned embodiment, the decorative material such as phenol backer was used as the surface layer material.
The same softwood or lauan thin plate as used in 4 may be used.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a manufacturing process of a grand roof for a grand piano as an embodiment of the present invention.

FIG. 2 is likewise a manufacturing process explanatory diagram of a grand piano large roof.

FIG. 3 is likewise a manufacturing process explanatory diagram of a grand piano large roof.

FIG. 4 is a perspective view of the grand roof for the grand piano in the process of being manufactured.

FIG. 5 is a perspective view of a corner member as an embodiment of the present invention.

FIG. 6 is a perspective view of a grand roof for a grand piano.

FIG. 7 is an explanatory diagram of a manufacturing process of a conventional grand piano large roof.

[Explanation of symbols]

2 ... Particle board 2a ... Front surface 2b ... Back surface 4, 18 ... Phenol backer 6 ... Corner 10
... End face 12 ... Shaving part 14 ... Corner member 14a ... Corner part
14b ... upper surface 16 ... chamfered portion 20 ... paint layer 22 ... large roof for grand piano

Claims (8)

[Claims] 1. A plate material comprising a core material made of a material which is difficult to form a smooth coated surface, and a surface layer material made of a material which easily forms a smooth coated surface on both front and back surfaces of the core material or a surface material. Is a large roof for a grand piano, in which a corner member that facilitates the formation of a smooth painted surface is arranged at the corner of the outer peripheral edge, and the chamfered portion of this corner member is painted. A large roof for a grand piano. 2. The large roof for a grand piano according to claim 1, wherein the core material is a particle board or a fiber board. 3. The large roof for a grand piano according to claim 1, wherein the corner member is a laminated body of wood veneer. 4. The large roof for a grand piano according to claim 3, wherein the wood is a conifer or a lauan. 5. A plate material comprising a core material made of a material which is difficult to form a smooth coated surface, and a surface layer material made of a material which easily forms a smooth coated surface on both front and back surfaces of the core material or a surface material. This is a method for painting the chamfered part of the grand roof for grand pianos, in which the corners of the outer peripheral edge of the grand roof for the grand piano are carved larger than the shape of the chamfered part, and a smooth painted surface is formed on the carved part. A method for coating a chamfered part of a grand roof for a grand piano, characterized in that an easy-to-use corner member is embedded and fixed, the corner member is cut into a predetermined shape including the shape of the chamfered portion, and the cut portion is painted. . 6. The method for coating a chamfered portion of a grand roof for a grand piano according to claim 5, wherein the core material is a particle board or a fiber board. 7. The method for coating a chamfered portion of a grand roof for a grand piano according to claim 5, wherein the corner member is a laminated body of wood veneer. 8. The method of coating a chamfered portion of a grand roof for a grand piano according to claim 7, wherein the wood is softwood or lauan.