JPH1055169A - Manufacturing method of side plate and loading of grand piano - Google Patents

Abstract

(57) [Problem] To provide a manufacturing method of a side plate and a stack of a grand piano, which can efficiently manufacture a side plate and a stack, thereby reducing a manufacturing cost. SOLUTION: A side plate veneer laminating step of laminating a plurality of side plate veneers 1a and 1b while applying an adhesive to their laminating surfaces, and a plurality of stacking veneer plates 2a are laminated on each other. A stacking veneer veneer laminating step of laminating while applying an adhesive to the plurality of side veneer veneers 1a, 1b and a plurality of laminating veneer veneers 2a. A molding step of simultaneously molding the side plate 1 and the stack 2 by inserting and pressing between a pair of dies 4a and 4b having a predetermined curved shape with the sheet-shaped spacer 3 interposed therebetween; After the pressurization is released, a separating step of separating the molded side plate 1, the spacer 3, and the molded stack 2 from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a side plate and a stack of a grand piano.

[0002]

2. Description of the Related Art A grand piano is generally provided with a stack and side plates having a shape conforming to the outer shape thereof. The stacking, together with the supports, frames, soundboards, and the like attached to the stack, constitutes the back mechanism of the grand piano and is a portion that serves as a base for attaching the side plate. On the other hand, the side plate is adhered to the outer peripheral surface so as to cover the stacking, and forms the exterior of the grand piano.

[0003] Except for a grand piano of a high-end model, the stacking is constituted by a laminated plate in which a plurality of wooden veneers are laminated and bonded. And pressurized to form a shape that matches the external shape of the grand piano. The side plate is also made of a laminated plate manufactured in the same manner as the loading, and is formed separately from the loading by a press molding machine, and then adhered to the outer peripheral surface of the loading. ing.

[0004]

However, in the above-mentioned conventional method of manufacturing the side plate and the stacking, the side plate and the stacking are manufactured separately by the press molding machine, so that the manufacturing efficiency is not good and the molding is not performed. In many cases, the curved surface shapes of the side plates and the stack do not exactly match due to slight deviation of the curvature, etc., and therefore, an adjustment work is needed to match the curved surface shapes of both, and as a result, manufacturing costs are reduced. It has the disadvantage of rising.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and a side plate of a grand piano and a side plate of a grand piano capable of efficiently manufacturing side plates and stacking, thereby reducing manufacturing costs. It is an object of the present invention to provide a method of manufacturing a stack.

[0006]

In order to achieve this object, a method of manufacturing a side plate and a stack of grand pianos according to the present invention comprises applying a plurality of veneer veneers to each other by applying an adhesive to a laminated surface of the side plates. Veneer veneer laminating step of laminating, veneer veneer laminating step of laminating a plurality of veneer veneers while applying an adhesive to each other's laminating surface, and veneer veneer veneer veneers By inserting a plurality of stacked veneer plates between a pair of molds having a predetermined curved shape with a flexible sheet-like spacer interposed therebetween, and by pressing A molding process for simultaneously molding the side plate and the loading,
And a separating step of separating the molded side plate, the spacer, and the molded stack from each other after releasing the pressurization.

According to this manufacturing method, the plurality of veneer veneers and the plurality of veneer veneers are laminated while applying an adhesive, and the laminated veneer veneer and the veneer veneer are laminated. With the flexible spacer interposed therebetween, the mold is inserted between a pair of molds having a predetermined curved surface shape, and is pressed to simultaneously mold the side plates and the stacking. Then, by separating the molded side plate, the spacer and the molded stack from each other, the side plate and the stack having a shape conforming to the external shape of the grand piano are manufactured.

As described above, according to the present invention, since the side plates and the stacking are press-formed at the same time, the production efficiency thereof can be increased. In addition, since the side plate and the stacking are simultaneously formed with the interposition of a flexible sheet-shaped spacer, the formed side plate and the curved shape of the stacking can be matched, and this is performed for correction thereof. Conventional adjustment operations are unnecessary or very simple. As a result, it is possible to reduce the manufacturing cost of the side plate and the loading.

In this case, it is preferable to further include a dividing step of dividing the formed unloading into two along the length direction.

In a grand piano, the height of the stack is generally about one half of that of the side plate. Therefore, by dividing the formed stack into two along the length direction, two pianos are formed. Stacking can be obtained at the same time, and the production efficiency can be further increased.

In these cases, the side plate and the stacking of the grand piano are respectively constituted by a flat plate portion forming the front left and right portions thereof and a curved plate portion forming the rear portion thereof. It is preferable that the curved plate portion is manufactured by the manufacturing method according to claim 1 or 2.

In this configuration, the side plate and the stacking are divided into a flat plate portion and a curved plate portion, respectively. Of these, the side plate and the curved plate portion of the stacking are manufactured by the above-described method. . By such a side plate and the split configuration of loading,
In addition to facilitating the handling during the manufacture, only the curved plate portion needs to be formed into a curved surface, so that a compact press molding machine can be used, and equipment costs can be reduced. Also,
Each of the side plate and the flat plate portion of the stacking can be easily manufactured by stacking the single plate for the side plate and the single plate for stacking, and simply pressing them with a press having a flat press surface.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 3 shows a side plate and a stack of grand pianos manufactured by a manufacturing method to which the present invention is applied. As shown in the figure, in this grand piano, the side plate 1 and the loading 2 are each 3
It has a split configuration. That is, the side plate 1 is composed of left and right flat plate portions 1L and 1R forming front left and right straight portions of the external shape of the grand piano, and a curved plate portion 1C forming a rear curved portion.
And formed by joining them together. Similarly, the unloading 2 includes the left and right flat plate portions 2L, 2R
And a curved plate portion 2C.

Although not shown, the stack 2 constitutes a backing mechanism of a grand piano together with a support, a frame, a sound board, and the like attached thereto, and serves as a base on which the side plate 1 is attached. On the other hand, as shown in the figure, the side plate 1 is adhered to the outer peripheral surface thereof so as to cover the stack 2 and constitutes the exterior of the grand piano.

The flat plate portions 1L and 1R of the side plate 1 and the curved plate portion 1
Each of C is composed of a laminated plate as shown in FIG. Specifically, for example, 13 pieces of lauan veneers 1a in which the grain is superimposed at right angles to each other, and two decorative veneers 1b made of hippo, macaure, etc. on the front and back surfaces thereof,
1b and a laminated board of about 15 layers in total,
Its width (height when attached) is about 30 cm and its thickness is about 22 mm. The flat plate portions 2L, 2R and the curved plate portion 2C of the stacking 2 are also formed of laminated boards, and as shown in FIG.
Approximately 13 layers of lauan veneer 2a, which is thicker than side plate 1 and is about 35-40 mm in width and about 15c in width
m.

Next, a method of manufacturing the side plate 1 and the stack 2 having the above-described configuration will be described with reference to FIG. This figure shows a manufacturing procedure of the curved plate portions 1C and 2C of the side plate 1 and the stack 2.

A. First, the Lauan veneer 1a and the decorative veneer 1b that constitute the curved plate portion 1C of the side plate 1 are laminated with the above-described predetermined number and layer configuration while applying an adhesive to each other's lamination surface (side plate veneer). Unloading 2 along with board lamination process)
The lauan veneers 2a constituting the curved plate portion 2C are laminated while applying a predetermined number of adhesives as described above (stacking veneer veneer laminating step). B. Next, as shown in FIG. 1 (a), the laminated Lauan veneer 1a, the decorative veneer 1b, and the laminated Lauan veneer 2a stacked as described above have a spacer 3 interposed therebetween. Then, the outer mold 4a and the inner mold 4b of the press molding machine 4
Insert between The spacer 3 is in the form of a sheet having flexibility, and is made of, for example, a thin silicon rubber sheet. The surfaces of the outer die 4a and the inner die 4b of the press molding machine 4, that is, the pressed surfaces are curved plate portions 1C, 2C.
Has a predetermined curved surface shape that matches the curved surface shape of. C. Next, as shown in FIG. 3B, the pressing is performed between the outer die 4a and the inner die 4b under predetermined pressure and temperature conditions. Thereby, the curved plate portion 1 having a predetermined curved surface shape
C and 2C are molded simultaneously (molding step); Next, the press molding machine 4 is depressurized, and immediately thereafter, the curved plate portion 1C, the spacer 3, and the curved plate portion 2C are integrally taken out and separated from each other as shown in FIG. . E. FIG. Finally, by cutting the curved plate portion 2C of the stack 2 along its length direction, as shown in FIG.
Dividing into two curved plates 2C1 and 2C2 for two pianos (dividing step).

Although not shown, the flat plates 1L and 1R of the side plate 1 and the flat plates 2L and 2R of the stack 2 are laminated in a predetermined number and layer structure, and a flat press surface is formed. It can be easily manufactured by simply pressurizing with a press having the same.

As described above, according to the present embodiment, since the curved plate portion 1C of the side plate 1 and the curved plate portion 2C of the stack 2 are simultaneously pressed, the production efficiency thereof can be increased.
In addition, since the curved plate portions 1C and 2C are simultaneously molded with the thin flexible sheet-shaped spacer 3 interposed therebetween, the curved surface shapes of the molded curved plate portions 1C and 2C can be made identical to each other. Therefore, the conventional adjustment work which has been performed is unnecessary or very simple, so that the manufacturing cost of the side plate 1 and the stack 2 can be reduced.

In this embodiment, the side plate 1 and the stack 2 are each divided into three parts, namely, flat plate portions 1L, 1R and 2L, 2R and curved plate portions 1C, 2C. In addition, since only the curved plate portions 1C and 2C are formed into a curved surface, the press molding machine 4 for that purpose can be small and the equipment cost can be reduced. Furthermore, the height of the loading 2 is
Noting that there is a relationship of about 1/2 that of the above, the curved plate portion 2C of the molded stack 2 is divided into two along its length direction, thereby forming a curved plate portion 2C1 for two pianos. , 2C2
Can be obtained at the same time, and the production efficiency can be further increased.

The present invention is not limited to the embodiment described above, but can be implemented in various modes.
For example, in the embodiment, the side plate and the stacking are each configured into three divided portions of two flat plate portions and one curved plate portion, and only the curved plate portion is simultaneously molded. The present invention is also applicable to a single-sheet configuration in which the loading and the loading are respectively continuous. Conversely, even when the divided configuration of the side plate and the stacking is further advanced and each curved plate portion is divided into two or more, the corresponding ones of the divided curved plate portions may be simultaneously molded. In addition, the configuration of the details and the like can be appropriately changed without departing from the spirit of the present invention.

[0022]

As described above in detail, the method for manufacturing the side plates and the stacking of the grand piano of the present invention can efficiently manufacture the side plates and the stacking, thereby reducing the manufacturing cost. Has an effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method of manufacturing a side plate and a stack according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a side plate and a stacking.

FIG. 3 is a plan view of the side plate and the unloading.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side plate 1a Rawan veneer 1b Makeup veneer 1C Curved plate of side plate 1L Left plate of side plate 1R Right plate of side plate 2 Loading 2a Rawan veneer 2C Curved plate of loading 2L Left plate of loading 2R Right flat plate part for loading 3 Spacer 4 Press molding machine 4a Outer die 4b Inner die

Claims (3)

[Claims] 1. A veneer veneer laminating step of laminating a plurality of veneer veneers while applying an adhesive to each other's laminating surface; and bonding a plurality of stacking veneer veneers to each other's laminating surface. A stacking veneer laminating step of laminating while applying, and a sheet-like spacer having a flexibility between the plurality of stacked veneer veneers and the plurality of stacked veneer veneers. In the state of interposed, inserted between a pair of molds having a predetermined curved surface shape, by pressing, the molding step of simultaneously molding the side plate and the loading, and after the pressurization was released, it was molded A separating step of separating the side plate, the spacer, and the formed stack from each other, and a method for manufacturing a side plate and a stack of a grand piano. 2. The method according to claim 1, further comprising a dividing step of dividing the formed stack into two along a length direction thereof. 3. The side plate and the stacking of the grand piano are respectively constituted by a flat plate portion forming the front left and right portions thereof and a curved plate portion forming the rear portion thereof, and the curved plate portion and the stacking portion of the side plate are respectively provided. A method of manufacturing a side plate and a stack of a grand piano, wherein the curved plate portion of the frying is manufactured by the manufacturing method according to claim 1 or 2.