JPH11156008A - Manufacture of hitting rail for pachinko machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To normally perform the hitting operation of pinball at all times. SOLUTION: Respective bend piece parts 4 and 5 are bend downwards along bend lines on both sides of a guide rail part 3 ad the guide rail part 3 is press- molded so that the cross section should be in the projected arc shape of expanding successively higher from one end side in a longitudinal direction to the other end side. Then, the guide rail part 3 is press-molded so that the cross section should be in the latter-V shaped groove 21 of successively lowering from one end side in the longitudinal direction to the other end side.

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 firing rail for a pachinko machine.

[0002]

2. Description of the Related Art Conventionally, a launching rail for a pachinko machine of this type has a guide rail portion for guiding a fired pachinko ball at a central portion along a longitudinal direction of a vertically long strip-shaped metal plate, and is provided on both sides of the guide rail portion. In order to be attached to the front surface of the game board, a bent piece portion which is bent downward via a bending curve along the longitudinal direction is connected. Then, the guide rail portion has a cross section along one side from the other end side along the longitudinal direction, so that the pachinko ball riding on the upper surface of the guide rail portion can be accurately hit with the mallet arm and fly straight. It is formed in a V-shaped groove shape that gradually decreases toward the mallet side. When the firing rail is attached to a predetermined position on the front of the game board, the center line of the V-shaped groove must match the center of the tip of the hammer arm. This is an extremely important part because the center of the pachinko ball on which the player rides is displaced from the center of the tip of the hammer arm, hindering the hitting operation and making the pachinko ball unable to fly straight.

The firing rail for a pachinko machine has a flat metal strip disposed on the upper surface of a lower die, and the upper die is lowered so that the guide rail portion has a V-shaped groove in cross section. The upper die is lowered while the band-shaped metal plate is placed on the upper surface of the lower die, and the guide rail is similarly pressed again, and at the same time, each bent piece on both sides of the guide rail is bent. As a result, the V-shaped groove formed in the guide rail portion is pressed once again.

[0004]

As described above, when the V-shaped groove of the guide rail portion is pressed twice, the center line of the V-shaped groove may be slightly displaced. When the raised firing rail is attached to the front of the game board, V
There was a problem that the center of the pachinko ball riding on the character groove deviated from the center of the tip of the mallet arm, which hindered the hitting operation such that the pachinko ball could not fly straight. Therefore, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a method of manufacturing a firing rail for a pachinko machine, which can always perform a normal hitting operation without causing displacement. It is assumed that.

[0005]

In order to achieve the above object, a method of manufacturing a firing rail for a pachinko machine according to the present invention comprises:
A central portion along the longitudinal direction of the vertically long strip-shaped metal plate is a guide rail portion for guiding the fired pachinko ball, and the both ends of the guide rail portion are bent downward along the longitudinally extending fold curves along the longitudinal edges. A method of manufacturing a firing rail in which bent pieces are connected, wherein each bent piece is bent downward along the two-fold curve, and the guide rail is formed so that the cross section thereof is from one end to the other end in the longitudinal direction. The guide rail is formed into a V-shaped groove whose cross section gradually decreases from one end to the other end in the longitudinal direction. Pressure molding.

Hereinafter, a method of manufacturing a firing rail for a pachinko machine according to the present invention will be described with reference to the drawings. FIG. 1 is a developed plan view of a strip-shaped metal plate made of stainless steel for forming a firing rail A described later. The strip-shaped metal plate 1 has a tapered shape in which the width W1 at one end in the longitudinal direction is wider than the width W2 at the other end. A guide rail 3 is provided for guiding a pachinko ball that has been fired and sectioned in the central longitudinal direction of the strip-shaped metal plate 1 by the folding curves 2 and 2.
Also has a tapered shape in which the width W1 at one end is slightly wider than the width W2 at the other end. As a result, the bending pieces 4 and 5 are connected to the outside of the respective bending curves 2 and 2 via the bending curves 2 and 2, and the outer ends of the respective bending curves 2 and 2 and the bending pieces 4 and 5 are formed. Edge 4
a and 5a are parallel. Three small-diameter holes 6 are provided in one bent piece portion 4 at equal intervals, and the other bent piece portion 5 is provided.
Are provided with three large-diameter holes 7 larger in diameter than the small-diameter holes 6 so as to face the respective small-diameter holes 6. The small-diameter hole 6 and the large-diameter hole 7 are mounting holes for mounting on a front surface of a game board (not shown).

Next, a method for manufacturing the firing rail will be described with reference to FIGS. FIG. 2 shows a state in which primary molding is performed. In the figure, reference numeral 8a denotes an upper die, and 8b denotes a lower die. The upper die 8a is provided on the base 9 with the bent pieces 4, 5 of the strip-shaped metal plate 1.
A pair of side walls 10, 10 are formed to bend in parallel to the left and right, and a cross section is formed between these side walls 10, at the center of the strip-shaped metal plate 1 from one end to the other end in the longitudinal direction. Guide rail part 3 which becomes a convex arc gradually swelling toward
Are formed vertically. The lower end surface 11a of the concave mold 11 is located inside the lower ends of the side walls 10, 10, and its cross section is gradually deepened from one end to the other end as shown in FIGS. It is formed into a concave arc shape. The distance between the side walls 10, 10 is set so that the firing rail has a predetermined width.

On the other hand, in the lower die 8b, a convex die 13 is erected at the center of the base plate 12 so as to face the concave die 11. The upper end surface 13a of the convex mold 13 has a shape conforming to the lower end surface 11a of the concave mold 11, and has a convex arc shape gradually swelling from one end to the other end as shown in FIGS. Molded. Also, on both sides of the convex mold 13, concave recesses 14, 14 into which lower end portions of both side walls 10, 10 of the upper mold 8a can intervene.
Is molded.

Therefore, as shown in FIG. 2, with the upper mold 8a raised, the strip-shaped metal plate 1 is horizontally arranged at a predetermined position on the upper surface of the convex mold 13 of the lower mold 8b. In this state, the upper die 8a is lowered and pressurized, so that the guide rail 3
Has a cross section gradually swelling from one end side to the other end side in the longitudinal direction, and fold curves 2 and 2 on both sides of the guide rail portion 3.
As a result, an intermediate firing rail A1 in which both the bending pieces 4 and 5 are bent downward is formed.

FIG. 4 shows a state in which secondary molding is performed. In the figure, reference numeral 15a denotes an upper die, and 15b denotes a lower die. Upper die 15
a, a pair of left and right side walls 16, 16 is vertically installed at the same distance from the base 9 as in the upper die 8 a,
A protruding mold 17 is provided between 6 and 16. As shown in FIGS. 4 and 5, the lower end face 17a of the convex mold 17 is formed into a symmetrical V-shape whose transverse cross section gradually projects downward from one end side to the other end side in the longitudinal direction. I have.

On the other hand, the lower mold 15b is also provided with a concave mold 19 standing at the center of the base plate 18 like the 8b so as to face the convex mold 17. The upper end surface 19a of the concave mold 19 is
As shown in FIGS. 4 and 5, the symmetrical V gradually lowers from one end to the other end so as to match the lower end surface 17a of the V.
It is formed in a groove shape. Reference numerals 20 and 20 denote concave portions formed on both sides of the concave mold 19, and the lower end portions of both side walls 16 and 16 can intervene.

Therefore, as shown in FIG.
With the a raised, the intermediate firing rail A1 is fitted to the upper end face 19a of the concave mold 19 of the lower mold 15b such that the side of the intermediate firing rail A1 that swells higher is located on the lower concave side of the upper end face 19a. In this state, the upper die 15a is lowered and pressurized. As a result, the transverse cross section of the guide rail portion 3 becomes a symmetrical V-shaped groove shape gradually lowering from one end side to the other end side in the longitudinal direction by the lower end face 17a of the convex 17 and the upper end 19a of the concave 19. As shown in FIG. 6, a firing rail A having a substantially M-shaped cross section in which a V-shaped groove 21 is formed on the upper surface of the guide rail portion 3 and gradually decreases from one end to the other end in the longitudinal direction. .

As described above, according to the method of manufacturing a firing rail for a pachinko machine of the present invention, the guide rail portion 3 is press-formed into a convex arc shape by primary forming, and then the guide rail portion 3 is formed into a cross-sectional V by secondary forming. Since the V-shaped groove 21 is press-formed in the shape of a V-shaped groove, the V-shaped groove 21 is always formed to a predetermined correct size without causing a positional shift due to pressing twice. Therefore, when the firing rail A is mounted by abutting the one side wall 5 at a predetermined position on the front surface of the game board, the center line of the V-shaped groove 21 of the guide rail portion 3 and the center of the tip of the mallet arm are out of alignment. And the pachinko ball supplied from the hit ball supply tray can always be normally fired.

[0014]

As described above, according to the method of manufacturing a firing rail for a pachinko machine according to the present invention, the guide rail is first press-formed into a convex arc shape, and then the guide rail portion is formed into a V-shaped cross section.
Since the V-shaped groove is press-formed twice in the conventional manner, the position is not caused by pressing twice, so that when the firing rail is mounted on the front of the game board, The deviation between the center line of the V-shaped groove and the center of the tip of the mallet arm is eliminated. Therefore, there is an effect that the launching operation of the hit ball can always be performed accurately and the hit ball can fly straight.

[Brief description of the drawings]

FIG. 1 is a developed plan view of a strip-shaped metal plate for forming a firing rail.

FIG. 2 is a schematic front view of upper and lower dies showing a state in which the band-shaped metal plate shown in FIG. 1 is primarily formed.

FIG. 3 is a side view of the convex and concave dies of the above and below dies.

FIG. 4 shows a state in which the intermediate firing rail is formed secondarily.
The schematic front view of a lower type | mold.

FIG. 5 is a side view of the concave and convex molds of the same and lower molds.

FIG. 6 is a perspective view of a firing rail.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Band-shaped metal plate 2, 2 Fold curve 3 Guide rail part 4, 5 Mounting piece part 21 V-shaped groove A Fire rail

Claims (1)

[Claims] 1. A center portion of a vertically long strip-shaped metal plate along a longitudinal direction is a guide rail portion for guiding a fired pachinko ball, and both side edges of the guide rail portion are formed through folding curves along the longitudinal direction. A method of manufacturing a firing rail in which bent pieces that are bent downward are connected, wherein each bent piece is bent downward along the two-fold curve, and the guide rail has a cross-section at one end in the longitudinal direction. From the side to the other end side, and press-formed so as to form a convex arc shape that swells gradually higher, and then the cross section of the guide rail portion gradually lowers from one end side to the other end side in the longitudinal direction. A method for manufacturing a firing rail for a pachinko machine, wherein the firing rail is pressure-formed so as to have a V-shaped groove shape.