JPH05168746A - Base plate for pachinko machine - Google Patents

Abstract

PURPOSE:To provide a Japanese pinball (pachinko) base plate having excellent nail holding force, strength, and the writing property on the surface without using wood for the core material of the base plate. CONSTITUTION:Hard high-density synthetic resin is used as a core material 1, and a wood veneer 2 is laminated on one face or both faces. The expansion ratio of the high-density synthetic resin is made 1.5-2.5 times to further improve the nail holding force and strength, and polystyrene resin is used for the high- density synthetic resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pachinko machine base plate.

[0002]

2. Description of the Related Art As a base plate for a pachinko machine, beech plywood, which is made by laminating a plurality of single plates with an adhesive, is generally used. Beech plywood is harder than ordinary plywood such as Lauan, so that it has relatively high nail pulling strength and has a feature that nails are not easily loosened during use as a pachinko machine. Further, the laminated veneers are alternately crossed in the fiber direction so as to be bonded and laminated, thereby suppressing the occurrence of warpage to a minimum.

However, in the case of a base plate of a pachinko machine, even if the warp is slight, the direction of the nail changes, which greatly affects the fall of the pachinko ball. In particular, the change in the warpage due to humidity cannot be ignored, and in general, it was very difficult to precisely adjust the payout rate. In addition, it is difficult to stably supply natural timber such as beech plywood, and in recent years, stable raw material procurement has become more and more difficult due to the necessity of forest protection. On the other hand, in recent years, the ball output rate has been adjusted by computer control, and along with this, the precision and stability of the base plate have become more demanding. On the other hand, these natural plywood cannot prevent variations in quality due to its essential properties, which has been an obstacle to computerization.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a base plate for a pachinko machine, which has a high nail pulling strength and is hard to be deformed without using natural wood such as beech plywood as much as possible.

[0005]

The main feature of the present invention is that a hard low-foam synthetic resin is used as a core material, and a wood veneer is laminated on one or both surfaces of the core material.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a base plate according to the present invention. In the figure, 1 is a wood veneer, and 2 is a hard low-foam synthetic resin. 2 is another embodiment of the base plate according to the present invention, and 1 and 2 are the same as FIG. In the present invention, the hard low-foaming synthetic resin is a synthetic resin having a relatively low foaming ratio, specifically, 1 to 3 times, preferably 1.5.
~ 2.5 times. As the resin, polystyrene resin,
Polyester resin, polypropylene resin, vinyl chloride resin and the like can be used, and polystyrene resin having an appropriate hardness is preferably used.

The hardness of the resin is determined by the composition of the resin to be used and the foaming ratio, but normally a hardness of 1 kgf or more can be used in the spring hardness test. When polystyrene resin is used, the expansion ratio is 3 times and the hardness is 1K.
It becomes gf or more. If you do not foam the resin, the hardness is high,
Since problems such as cracks occur during nailing, it is essential to use a resin that has been appropriately foamed.

The veneer that can be used in the present invention is not particularly limited, but it is preferable to use a hardwood veneer because it is excellent in hardness, homogeneity and restoration. The thickness of the veneer used is generally 0.5 mm to 2.0 mm, preferably 0.8 m.
It is m to 1.2 mm. The lamination of the core material made of foamed synthetic resin and the single plate is generally performed with a thermoplastic resin adhesive, an epoxy adhesive, a hot melt adhesive, or the like.

On the surface of the base plate configured as described above (in the case of a single-sided single plate laminated, the single plate surface is the surface), the paper, the plastic film, etc. printed according to the nail position of the pachinko machine are printed. Can be stacked. Also, by screen printing,
It is also possible to perform direct printing before or after laminating the single plates. Nail driving can be performed in exactly the same manner as a base plate made of conventional plywood. Also, after nailing,
It is also possible to adjust the angle of the nail and control the ball output as needed, similarly to the conventional base plate.

[0010]

As explained above, since the base plate of the present invention uses the wood veneer only on the surface, it is possible to significantly reduce the amount of wood used per base plate, and indirectly to the forest resources. It contributes to the protection of. In terms of performance, the elasticity of the foamed synthetic resin enhances the holding force of the nail, and the readjustment of the nail prevents the nail hole from expanding and loosening. In addition, at least one surface (front surface) of the foam synthetic resin plate
In addition, by stacking the single plates, it is possible to print directly, and it is possible to easily attach the printing paper by using a water-based adhesive with excellent writing performance. Further, when the angle of the nail is readjusted, no void is formed on the surface due to the restoring property of the wood. Furthermore, the warp is less than that of a base plate made of conventional plywood, and the influence of humidity is very small. Further, since the hardness of the core material is uniform depending on the place and lot, it is possible to perform more delicate and stable ball output control.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating the configuration of an embodiment of a pachinko machine base plate according to the present invention.

FIG. 2 is a cross-sectional view illustrating the configuration of an embodiment of a pachinko machine base plate according to the present invention.

[Explanation of symbols] 1 hard low-foam synthetic resin plate 2 single plate

Claims (3)

[Claims] 1. A base plate for a pachinko machine, wherein a wood veneer is laminated on one or both sides of a hard low-foam synthetic resin. 2. The expansion ratio of the hard low-foaming synthetic resin is 1.
The base plate for a pachinko machine according to claim 1, which is 5 to 2.5 times larger. 3. The base plate for a pachinko machine according to claim 1, wherein the hard low-foam synthetic resin is polystyrene.