JP2000140381A - Pinball game machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a playing ball to travel smoothly in a tank rail. SOLUTION: A tank rail 14 is mounted on a functioning rear board 11 through a mounting plate 17. The mounting plate 17 is provided with an axial hole 50, long holes 52, 54, and 60 and screwed to the functioning rear board 11 with bolts 66 passing through the above-mentioned holes. If the bolts 66 are loosened and a bolt 55 is rotated, the mounting plate 17 can travel in the width of long holes 52, 54, 60, rocking around the axial hole 50, so that the tilt angle of the tank rail 14 can be adjusted. If the each bolt 66 touches the each upper edge of long holes 52, 54, 60, then the tilt angle of the tank rail 14 is three degrees. If the each bolt 66 touches the each lower edge of the long holes 52, 54, 60, then the tilt angle is four degrees. Thus, the tilt angle of the tank rail 14 can be adjusted within three to four degrees, so that a playing ball can travel smoothly in the tank rail 14, whatever the polishing method is.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of ball and ball game machines represented by pachinko machines.

[0002]

2. Description of the Related Art Many ball game machines, such as pachinko machines, have a structure in which game balls are paid out as prize balls in accordance with winning or scoring. For this reason, a normal ball game machine has passed through a prize ball tank storing game balls for prize balls, a tank rail guiding tanks flowing out of the prize ball tank in a substantially horizontal direction while aligning the game balls, and a tank rail. A payout device for discharging game balls in units of a set number of prize balls, for example, six or fifteen, a prize ball guiding passage for guiding game balls discharged from the payout device, and a game ball flowing down a prize ball guiding passage. It has a saucer that accepts. Usually, the receiving tray is installed on the front side of the ball game machine, and the prize ball tank, the tank rail, the payout device, and the prize ball guide path are installed on the back side of the ball game machine.

[0003]

The tank rail guides the game balls flowing out of the winning ball tank in a substantially horizontal direction while aligning them. Here, the reason why the game balls are arranged in, for example, two rows is to carry out accurate and prompt discharge processing by the payout device.

[0004] Since dirt such as iron dust and the like derived from floating dust and collision of the game balls adheres to the game balls, polishing is performed to remove the dirt. The polishing method includes a resin pellet method, a belt lifting method, and a leather polishing method, each of which has advantages and disadvantages.

[0005] In the resin pellet method, when a game ball collected from a ball-and-ball game machine is transported by a screw conveyor, resin pellets of nylon or polyethylene are mixed, and the resin pellet contacts (rubs) with the game ball. , To remove dirt from the game ball. However, since a large load is applied at the time of lifting, particularly when moving in the vertical direction, the surface of the resin pellets may be peeled off, which becomes resin dust and adheres to the surface of the game ball. The resin dust adhering to the game ball remains as a film, so that the lubricating property improves the slip of the game ball. If the game ball slides better, the friction with the guide nail etc. will decrease and the falling speed will not decrease, so the rebound when colliding with the guide nail will also increase, so the fall path on the game board surface is what the game shop expects Unlike this, the ball pitch tends to decrease.

In the belt lifting system, a game ball is lifted between a fixed cloth belt and an artificial leather belt which rotates facing the belt, and the belt contacts at this time. Removes dirt from the game ball. However, since the area of contact with the belt is small, the efficiency of removing dirt is not very good, and fiber debris generated from the cloth belt may cause dirt. Game balls polished in this way,
Compared to the resin pellet type polishing, the ball is less slippery, and the fiber debris attached to the game ball serves as a cushioning material to reduce the rebound, so that the ball-out rate tends to increase.

[0007] Finally, in the leather polishing method, a game ball and a piece of leather are put into a rotating drum and stirred, and the game ball is polished with a piece of leather. In this method, almost no dust or the like is generated at the time of polishing or lifting, and the polishing is also good. However, frequent replacement of the skin pieces is troublesome. In addition, all game balls in the store must be transported to the rotating drum, which is not suitable for a single island.

[0008] As described above, if the difference in the polishing method causes a difference in the sliding of the game balls, the game balls may not move smoothly or may be clogged depending on the inclination angle of the tank rail. For example, when polished by the resin pellet method, the friction of the surface of the game ball becomes small. Therefore, when the inclination of the tank rail 200 (accurately, the inclination of the bottom surface) is large, as shown in FIG. However, since the ball slips under the ball leveling 202, the ball reaches the wrapper 204 covering the exit portion of the tank rail 200 while being overlapped in three stages, and the ball may be clogged there.

FIG. 1 shows that the polishing is performed by the belt lifting method.
As shown in (b), 1 or 2 by the ball leveling 202
Since the wrapper 204 reaches the wrapper 204 after the tiering, the ball is hardly clogged here. However, moisture condensed due to heating and cooling, etc., moves to the fiber debris and the like adhering to the game ball on the game ball transfer path and expands, making it difficult for the game ball to roll. Ball clogging easily at the entrance.

Therefore, it is preferable that the inclination of the tank rail 200 is small for the resin pellet type polishing, and that the inclination of the tank rail 200 is large for the belt lifting type polishing. In the case of the leather polishing method, an intermediate point is suitable. As described above, the appropriate angle of inclination of the tank rail differs depending on the polishing method (that is, the ease of sliding of the game ball). However, in the conventional ball game machine, the difference in the ease of sliding of the game ball is considered. I didn't.

The inclination angle of the tank rail is also affected by the width of a vertical groove provided for removing (falling) a foreign object flowing along with the game ball. If priority is given to the elimination of foreign matter without fail, the wider the vertical groove, the better. However, when the width of the vertical groove is large, the contact point between the game ball and the vertical groove is close to the center of the game ball, so that the moving distance per rotation of the game ball becomes small, and the moment at the time of rotation also becomes small. Therefore, the moving speed is reduced, and the rotation may be suppressed or stopped even with a small resistance.
Therefore, if the width of the vertical groove is set to be wide, it is necessary to increase the inclination of the tank rail. However, if the inclination is increased, the ball pressure applied to the above-mentioned wrapper portion increases, and there is a possibility that the ball may be clogged.

On the other hand, when the width of the vertical groove is set narrow,
Since the contact point between the game ball and the vertical groove is far from the center of the game ball, the movement distance per rotation of the game ball is large, and the moment at the time of rotation is also large. For this reason, the moving speed increases. Therefore, if the width of the vertical groove is set to be narrow, the inclination of the tank rail may be reduced. However, when the width of the vertical groove is reduced, foreign substances cannot be reliably removed.

As described above, the inclination angle of the tank rail has an appropriate angle in accordance with the difference in the polishing method of the game ball (that is, the ease of sliding of the game ball), and the width of the vertical groove is also related. However, as far as the inventor knows, the inclination angle of the tank rail is determined by the polishing method of the game ball (the ease of slip of the game ball).
There is no research example analyzed in connection with the above, and there is no example in which the inclination angle of the tank rail is set in relation to the polishing method (easy sliding of the game ball). Similarly, there is no example in which the inclination angle of the tank rail is related to the width of the vertical groove.

The present invention seeks to set the dimensions of a tank rail from a viewpoint that has not been proposed so far, and an object of the present invention is to ensure smooth movement of a game ball on a tank rail. .

[0015]

According to a first aspect of the present invention, there is provided a ball game machine comprising: a tank rail for guiding game balls flowing out of a prize ball tank in a substantially horizontal direction while aligning the game balls; In a ball game machine including a payout device that discharges game balls that have passed through a tank rail and a prize ball guiding passage that guides game balls discharged from the payout device to a saucer, the inclination angle of the bottom surface of the tank rail is set to The angle is set to 3 to 4 degrees.

According to a second aspect of the present invention, there is provided a ball game machine comprising: a tank rail for guiding game balls flowing out of a prize ball tank in a substantially horizontal direction while aligning the game balls; and a payout device for discharging game balls passing through the tank rail. And a prize ball guiding path for guiding a game ball discharged from the payout device to a receiving tray, wherein the width of the dust removing vertical groove provided on the bottom surface of the tank rail is set to 3.5-4. 0.5 mm.

According to a third aspect of the present invention, there is provided a ball game machine comprising: a tank rail for guiding game balls flowing out of a prize ball tank in a substantially horizontal direction while aligning the game balls; and a payout device for discharging game balls passing through the tank rail. And a prize ball guiding path for guiding a game ball discharged from the payout device to a saucer, wherein the inclination angle of the bottom surface of the tank rail is 3 to
4 degrees, and the width of the vertical groove for dust removal provided on the bottom surface of the tank rail is 3.5 to 4.5 mm.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the case of a game ball polished by a resin pellet method, if the inclination angle of the tank rail is less than 2 degrees, the movement in the tank rail is not smooth. If the angle is set to 2 degrees or more, the movement in the tank rail becomes smooth. In particular, in the range of 2 to 3 degrees, the state shown in FIG. Also, even if it exceeds 3 degrees,
For example, if the angle is about 3.5 degrees, the state shown in FIG. 1A hardly occurs. Therefore, the inclination angle suitable for the game ball polished by the resin pellet method is 2 to 3.5 degrees,
Preferably it is 2-3 degrees.

Next, in the case of a game ball polished by the belt lifting method, the inclination angle of the tank rail is set to about 4 degrees (3.5 to 3.5).
(4.5 degrees), ball clogging due to dirt on the game ball does not occur. If the angle is less than 3.5 degrees, the movement of the game ball becomes slightly less smooth, but if it is more than 3 degrees, there is no practical problem and the ball is not clogged due to the dirt on the game ball. On the other hand, when the inclination angle of the tank rail is 5 degrees or more, the downward momentum increases, so that a malfunction such as that shown in FIG. 1A may occur. Therefore, the inclination angle suitable for the game ball polished by the belt lifting method is 3 to 4.5 degrees, preferably 3.5 to 4.5 degrees.

The ease of sliding of a game ball polished by the leather polishing method is between the resin pellet method and the belt lifting method.
When these are comprehensively evaluated and the ease of sliding of the game ball is used as a reference, it is preferable to set the inclination angle of the tank rail to 3 to 4 degrees. Particularly preferably, it is 3 to 3.5 degrees.

Next, as shown in FIG. 2, the diameter of the game ball is 11 mm, and the width of the vertical groove is 2.50 mm to 0.5 m.
When changed in m units, the rotation diameter of the game ball (the diameter of the cross section passing through the contact point with the vertical groove) is from 10.725 mm to 8.
It changes up to 025 mm. Therefore, the moving distance per revolution of the game ball is 10.725π (about 33.68).
mm to 8.025π (about 25.20) mm.

When the inclination angle of the tank rail is set to the above-mentioned 3 to 4 degrees, although there is a slight difference depending on the polishing method, if the width of the vertical groove is 2.50 to 4.50 mm, the game ball will not stagnate. However, if the distance is more than 5.00 mm, the game ball may stagnate. Therefore, the width of the vertical groove is preferably 2.50 to 4.50 mm based on the rolling resistance of the game ball.

On the other hand, considering foreign matter, fiber waste,
Since the powder and fragments of the resin pellet are relatively small, if the width of the vertical groove is 2.50 mm, for example, the resin pellet sufficiently passes (falls). However, a large foreign object, typically a two-inch nail used to attach a ball game machine to a game machine installation island, or a two-inch nail body for screws used in ball game machines and peripheral devices The diameter is about 3.8mm, and most of the screws have a body diameter of about 3.8mm
It is. Therefore, in consideration of these screws and the like, the width of the vertical groove is preferably 4.00 mm or more. However, it can be said that there is a low possibility that screws or the like are mixed in the original form, so that it can be considered sufficient to deal with fragments of the screws or the like. In this case, the width of the vertical groove may be 3.50 mm or more.

In consideration of both the rolling resistance and the removal of foreign matters, the width of the vertical groove is preferably 3.50 to 4.50 mm, more preferably 4.00 to 4.5 mm. Next, embodiments of the present invention will be described more specifically by describing embodiments of the present invention with reference to the drawings.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
(Only the vicinity of the tank rail is shown because the overall structure is publicly known.) The prize ball tank 1
2 is mounted, and a tank rail 14 is installed below it. Further, a wrapper 16 opened to the tank rail 14 side is connected to a downstream end of the tank rail 14, and a relay gutter 18 leading to a dispensing device (not shown) is connected to a downstream side thereof.

The tank rail 14 has a mounting plate 17 made of steel plate.
Is attached to the back mechanism board 11 of the ball and ball game machine 10. The mounting plate 17 has a circular shaft hole 50 near the downstream end of the tank rail 14, two long holes 52 and 54 near the upstream end of the tank rail 14, and one long hole 60 above the tank rail 14. Are provided respectively, and the shaft hole 5 is provided.
0, and is screwed to the back mechanism board 11 by a bolt 66 with a knob penetrating through the long holes 52, 54, 60. The tank rail 14 is provided with claws 56, 5 provided on the bottom thereof.
8 is screwed to the mounting plate 17 with screws 68 penetrating therethrough.

A nut 53 is fixed to the mounting plate 17, and a bolt 55 is screwed to the nut 53. The bolt 55 is connected to a bearing 57 fixed to the back mechanism panel 11.
, But is held in a state where movement in the axial direction is restricted, and can be rotated by a knob 59 arranged below the bearing 57. When the bolt 55 is rotated, the axial positions of the bolt 55 and the bearing 57 do not change, but the axial positions of the bolt 55 and the nut 53 change.
That is, the nut 53, that is, the mounting plate 17 can be drawn toward or away from the bearing 57.

For this reason, if the bolt 66 is loosened (it is not necessary to remove it, especially the bolt 66 of the shaft hole 50 is not removed) and the bolt 55 is rotated, the mounting plate 17 (tank rail 14)
Can be pivotally displaced around the bolt 66 of the shaft hole 50 in the range of each of the long holes 52, 54, 60, whereby the inclination angle of the tank rail 14 can be adjusted.

In the case of this embodiment, each of the long holes 52, 54, 60
The inclination angle of the bottom plate 34, the bottom plate 36, and the bottom plate 42 of the tank rail 14 when the bolt 66 contacts the upper end of the tank rail 14 is 3 degrees. On the contrary, each of the long holes 52, The setting is such that the bottom plate 34, the bottom plate 36, and the bottom plate 42 have an inclination angle of 4 degrees when the bolt 66 contacts the lower ends of 54 and 60. That is, the inclination angle of the tank rail 14 can be adjusted within a range of 3 to 4 degrees.

Further, a ball leveling attachment pin 64 erected on the back mechanism board 11 penetrates through the mounting plate 17, and this pin 64 holds the ball leveling 62 in a swingable manner. The ball leveling 62 is provided with an arm 62a.
a activates the excess sensor 65. More specifically, as shown in a partial view, when the ball leveling 62 swings counterclockwise beyond the set angle, the arm 62a moves out of the detection range of the excess sensor 65, and the signal level of the excess sensor 65 Changes. Therefore, based on the signal of the excess sensor 65, it can be determined whether or not an excessive game ball is staying in the tank rail 14. The signal of the excess sensor 65 is sent to the management computer, and the management computer is used to stop the supply of the prize ball to the ball game machine 10.

As shown in FIG. 4, at the upstream end of the tank rail 14, a ball receiving portion 20 for receiving a game ball falling from the prize ball tank 12 is provided. The ball receiving portion 20 is divided into two parts by a partition 23 erected in the center.
The height of the partition 23 is about the radius of the game ball.

One rectangular hole 21 is provided on each side of the partition 23, and the detecting plate 24 of the load detecting member 22 is inserted into each of the rectangular holes 21. The load detecting member 22 is urged upward by a spring (not shown).
4 is projected above the bottom of the ball receiving portion 20, but when a load of the game ball is applied, the detection plate 24 is at a lowered position where the detection plate 24 is almost at the same level as the bottom of the ball receiving portion 20. As shown in FIG. 3, an elevating plate 25 is provided at the lower end of the load detecting member 22. When the detecting plate 24 (that is, the load detecting member 22) is at the lowered position, the elevating plate 25 is switched to a replenishing switch 27.
Press the pressure receiving projection 29 to turn off the supply switch 27,
When the load detecting member 22 is at the raised position, the elevating plate 25 is separated from the pressure receiving projection 29, and the supply switch 27 is turned on. The signal of the supply switch 27 is sent to the management computer, and the management computer is used to start supply of the game balls for the prize balls to the ball game machine 10.

The supply switch 27 is provided with a delay time as an operating condition, and does not operate when it is turned on for a moment in the off state or off for a moment in the on state. This is a countermeasure when instantaneous ON / OFF repetition occurs due to, for example, vibrations hit by the player. In the present embodiment, the delay time is set to 0.5 seconds.

As shown in FIG. 4, two guiding grooves 26 and 28 are provided in connection with the ball receiving portion 20. For more information,
The guide groove 26 is provided on the back plate 30 of the tank rail 14 and the partition 23.
Partition plate 32, back plate 30 provided along the extension of
And a bottom plate 36 on the partition plate 32 side. A vertical groove 38 for removing foreign matter is formed between the bottom plate 34 and the bottom plate 36. In addition, the bottom plate 36 also protrudes to the guide groove 28 side under the partition plate 32.

Similarly, the guide groove 28 is constituted by the partition plate 32, the front plate 40, the bottom plate 36 of the tank rail 14, and the bottom plate 42 on the front plate 40 side, and foreign matter is removed between the bottom plate 36 and the bottom plate 42. Vertical groove 44 is formed. Also,
A plurality of reinforcing plates 46 are fixed to the back surfaces of the bottom plate 34, the bottom plate 36, and the bottom plate 42, and the guiding grooves 28 are provided from the side of the ball receiving portion 20.
A projecting portion 48 is provided over an intermediate portion of.

The width of the guide grooves 26 and 28 is slightly larger than the diameter of the game ball (about 11 mm) (about 12 mm in this embodiment), and the height of the partition plate 32 is sufficient for the diameter of the game ball. Better than In the case of the present embodiment, the vertical groove 38,
The width of 44 is set to 4 mm.

As described above, the bottom plate 34, the bottom plate 3
6 and the inclination angle of the bottom plate 42, that is, the inclination angle of the guide grooves 26 and 28 can be adjusted in the range of 3 to 4 degrees. In the ball-and-ball game machine 10, since the inclination angle of the tank rail 14 is variable within a range of 3 to 4 degrees, the inclination angle can be set to an appropriate angle (for example, 3.5 degrees) within this range. For this reason, the game ball polishing method (resin pellet method,
Regardless of the belt lifting method or the leather polishing method), the movement of the game ball in the tank rail 14 is always smooth, and the ball is not clogged. In addition, the inclination angle is adjusted according to the polishing method of the game store, such as making the inclination angle gentle (3 degrees side) in the case of the resin pellet method, and steeply (4 degrees side) in the belt lifting method. The ball clogging can be more appropriately prevented.

Further, the width of the vertical groove 38 for removing foreign matter is 4 m.
Since it is set to m, the rolling resistance of the game ball does not become too large and the ball is clogged, and conversely, the ball becomes too small to increase the speed of the game ball. Also, relatively large foreign matters such as screws used in ball-and-ball game machines and peripheral devices can be reliably removed. (Modification) Even if the tank rail 14 is configured as shown in FIG. 5, for example, the inclination angle can be adjusted. In the example shown in FIG. 5, the back plate 30 of the tank rail 14 extends downward and to the left, and a shaft hole 50a similar to the shaft hole 50 described above and a long hole 52a similar to the long holes 52, 54, and 60 are formed thereon. , 54a, 60
Slots 56a and 58a are provided in place of the holes for a and screws 68. The tank rail 14 is directly attached to the back mechanism board 11 without using the attachment plate 17. At this time, the shaft hole 50a and the long holes 52a, 54a, 56a, 58a, 60
If a is screwed to the back mechanism board 11 with, for example, a bolt 66 with a knob, the inclination angle can be changed as in the embodiment. Although not shown in FIG. 5, an adjusting operation mechanism including the nut 53, the bolt 55, and the bearing 57 of the embodiment may be provided.

Although not shown, the tank rail 14 of the present modified example is provided with four guide grooves.
Since the supply port from the prize ball tank 12 to the tank rail 14 is also opened by four lines, game balls may flow from the prize ball tank 12 at a stretch. As described above, when the game balls flow at once, if the inclination angle of the guide groove of the tank rail 14 is large, the game balls move in a lump shape,
The ball may be clogged at the ball leveling 62. However, if configured in the same manner as in the embodiment, the replenishment can be stopped before the ball clogging occurs in the ball leveling 62 by the operation of the excess sensor 65, and the ball blocking in the ball leveling 62 as described above can be prevented. It can be prevented before it happens.

Of the four guide grooves, the front two are used for paying out prize balls (prize ball rails), and the remaining two are used for ball rentals (ball rental rails). Normally, game balls frequently move on the payout ball rail for payout, and the ball rental rail for loan does not move very often. However, there is a case where the game ball of the lending rail also moves by being inductively swept away by the game ball moving on the prize ball rail. At this time, the game ball of the lending ball rail pushes up the ball leveling 62 and the excess sensor 65 , Which could result in a loss of supply. Such inconveniences can be solved by making the inclination angle of the ball-for-sale rail looser by 0.7 to 1.2 degrees compared to the ball-for-sale ball and increasing the partition between the ball-for-sale rail and the ball-for-sale rail.

In some cases, the prize ball rail may be two, and the lending ball rail may be one. If you make the rental ball rail one,
Unlike the case of Article 2, during lending, the ball pressure at the prize ball rail side causes the ball to be easily clogged at the branch point between the rent ball rail and the prize ball rail. As a countermeasure, it is preferable to make the inclination angle of the ball rental rail larger by 1 to 1.5 degrees than the prize ball rail.

Although the embodiments of the present invention have been described with reference to the embodiments, the present invention is not limited to such embodiments, and it can be implemented in various ways without departing from the gist of the present invention. Needless to say.

[0043]

According to the first aspect of the present invention,
Since the bottom angle of the tank rail is set to 3 to 4 degrees, game balls polished by various polishing methods can be smoothly moved, and ball clogging can be prevented.

According to the second aspect of the present invention, since the width of the vertical groove for dust removal provided on the bottom surface of the tank rail is set to 3.5 to 4.5 mm, the game ball is quickly moved. And foreign substances such as screws can be reliably removed. According to the third aspect of the present invention, the tank rail has a bottom surface having an inclination angle of 3 to 4 degrees and a vertical groove for dust removal provided on the bottom surface has a width of 3.5 to 4.5 mm.
Therefore, the advantages of the first and second aspects are also provided.

[Brief description of the drawings]

FIG. 1 is a view showing an example of behavior of a game ball in a tank rail, and FIG. 1 (a) is a view showing an example of a state where the ball cannot be leveled sufficiently when the friction of the surface of the game ball is small; b)
It is an illustration figure of the state where the ball was normally leveled.

FIG. 2 is an explanatory diagram of a relationship between a width of a vertical groove of a tank rail and a rotation diameter of a game ball.

FIG. 3 is a rear view of the vicinity of the tank rail of the ball game machine of the embodiment.

FIG. 4 is a plan view of a tank rail of the ball game machine of the embodiment.

FIG. 5 is a front view of a tank rail of a modified example.

[Explanation of symbols]

10 ... ball game machine, 12 ... prize ball tank, 14 ... tank rail, 26 ... guide groove, 28 ... guide groove, 34 ... bottom plate, 36
... bottom plate, 38 ... vertical groove, 42 ... bottom plate, 44 ... vertical groove.

Claims (3)

[Claims] 1. A tank rail for guiding game balls flowing from a prize ball tank in a substantially horizontal direction while aligning them, a payout device for discharging game balls passing through the tank rail, and a game discharged from the payout device. A ball game machine having a prize ball guiding passage for guiding a ball to a saucer, wherein the inclination angle of the bottom surface of the tank rail is 3 to 4 degrees. 2. A tank rail for guiding game balls flowing out of the prize ball tank in a substantially horizontal direction while aligning the game balls, a payout device for discharging game balls passing through the tank rail, and a game discharged from the payout device. A ball game machine having a prize ball guiding path for guiding a ball to a saucer, wherein a width of a vertical groove for dust removal provided on a bottom surface of the tank rail is set to 3.5 to 4.5 mm. Ball game machine. 3. A tank rail for guiding game balls flowing out of a prize ball tank in a substantially horizontal direction while aligning them, a payout device for discharging game balls passing through the tank rail, and a game discharged from the payout device. A ball game machine having a prize ball guiding passage for guiding a ball to a saucer, wherein the inclination angle of the bottom surface of the tank rail is 3 to 4 degrees, and the width of a vertical groove for dust removal provided on the bottom surface of the tank rail. The ball-and-ball game machine characterized in that 3.5 to 4.5 mm.