JP2764437B2 - Attaching mechanism of passing ball detection switch in ball and ball game machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a passing ball detection switch mounting mechanism for detecting the passage of a pachinko ball facing a passage through which a pachinko ball used in a ball-and-ball game machine passes.

[Prior art]

Conventionally, as a mounting mechanism for a passing ball detection switch that detects the passage of a pachinko ball facing a passage through which a pachinko ball used in a ball game machine passes, the outer periphery of the passing ball detection switch is located at a position near the passage. It has been known to provide an engaging portion that engages with a portion and to perform positioning by the engaging portion to fix the passing ball detection switch.

[Problems to be solved by the invention]

By the way, for example, a proximity switch or a micro switch is used as a passing ball detection switch that detects the passage of a pachinko ball, and the outer peripheral shape of these passing ball detection switches is usually formed symmetrically on the left and right or up and down. In many cases, the passing ball detection switch may be erroneously mounted in the opposite direction (particularly in the vertical direction). In such a case, in the above-described conventional mounting mechanism, the engaging portion allows the mounting of the passing ball detection switch in the reverse direction, so that the operator does not notice that the mounting has been erroneously performed. There has been a problem that the passing ball detection switch does not accurately detect the pachinko ball, or the pachinko ball does not pass smoothly. The present invention has been made in view of the above problems,
It is an object of the present invention to provide a mounting mechanism of a passing ball detection switch in a ball game machine in which a passing ball detection switch cannot be mounted by mistake.

[Means for Solving the Problems]

In order to achieve the above object, a mounting mechanism for a passing ball detection switch according to the present invention is formed so that an outer peripheral shape of the passing ball detection switch is asymmetric, and a passing ball detection switch is provided near a passage. An engaging portion is formed such that the outer periphery of the passing ball detection switch does not stop when normally mounted, but does stop when mounted in the opposite direction.

[Action]

When the passing ball detection switch is mounted in the reverse direction, the engaging portion and the outer periphery of the asymmetric portion of the passing ball detection switch abut, and the passing ball detection switch is not correctly engaged. Notices that it has been attached to the device, and can be immediately reattached under normal conditions. That is, according to the present invention, the outer shape of the passing ball detection switch is formed to be asymmetrical, and by utilizing the asymmetry, the engaging portion and the outer circumference of the passing ball detection switch are impacted when normally mounted. It does not stop, and it is provided with an engaging portion so that when they are mounted in the opposite direction, they stop, thereby preventing the mounting in the reverse direction,
Normal operation of the passing ball detection switch can be ensured.

【Example】

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a pachinko game machine as an example of a ball game machine to which this embodiment is applied will be described with reference to FIG. FIG. 8 is a front view of the pachinko gaming machine. In the figure, a door holding frame 4 is provided around a frame-shaped front frame 3 which is attached to the outer frame 2 of the pachinko gaming machine 1 so that it can be opened and closed, and the door holding frame 4 has glass plates 5a, 5b (first (See FIG. 6A) and a glass door frame 5 and a front door plate 6 which are pivotally supported on one side and are openably and closably mounted. A game board 11 is attached to a game board holding frame 21 (see FIG. 9) which is fixed to the back of the front frame 3 behind the glass door frame 5.
It is provided detachably by 22a-22c. Further, on the surface of the front door plate 6, a hit ball supply tray 7 for storing the ejected prize balls and supplying one to the firing position of the hit ball is fixed. A speaker 8 for generating a sound effect related to the game is built in an internal space on the upstream side of the hit ball supply tray 7. At the lower part of the front frame 3, there are provided an operation handle 9 constituting a part of the hitting ball firing mechanism, and an excess ball receiving tray 10 for storing prize balls that could not be stored in the hitting ball supply tray 7. I have. A hit ball launching device 34 is mounted on the rear surface of the front frame 3 so as to correspond to the operation handle 9 as shown in FIG. Ball launcher 34
Are collectively provided on the mounting board, a ball motor 35 as a drive source, a ball rod 36 that reciprocates by the rotation of the ball motor 35 to repel a ball, and a reciprocation of the ball rod 36. A ball feed sliding rod 37 which moves up and down in conjunction with the rotation and operates a ball feed member of a hit ball supply device (not shown). On the surface of the game board 11, a game ball guiding rail 12a for guiding a shot ball fired, and a game area 13 in which a ball guided by the ball guiding rail 12a falls for a game area 13 The region forming rail 12b is erected in a substantially circular shape. Near the center of the game area 13, a plurality of rotating drums 15a
Is provided, and a variable winning ball device 40 having an opening / closing plate 44 is provided below the variable display device 14. The variable prize ball device 40 has a prize ball detection switch 63 and a specific prize ball detection switch 64 as pass-through ball detection switches, which are essential parts of this embodiment, built therein. The opening / closing plate 44 is supported by the surface of the game board 11 so as to be freely openable and closable about the lower end thereof, as described later in detail. The inside thereof is a specific winning area 45 at the center and a normal winning area 46a at the left and right. , 46b. The open / close plate 44 of the variable prize ball device 40 enters the specific game state when the combination of the identification display information of the rotating drums 15a to 15c of the variable display device 14 is in a predetermined display mode, and is set for a predetermined period (for example, (Until 20 seconds elapse or until ten winning balls are generated), and the ball hitting the game area 13 during the opening is received. Then, when the hit ball hits the specific winning area 45, the above-described open state is repeated again, and it can be repeated up to ten times each time a winning ball occurs in the specific winning area 45. In addition, a start winning port 42 for allowing rotation of the rotating drums 15a to 15c is provided at the upper center of the variable winning ball apparatus 40. In addition, starting winning ports 80a and 80b are also provided on both lower sides of the variable winning ball apparatus 40. This starting winning opening 80
Each of a and 80b also has a built-in winning ball detection switch 90 as a passing ball detection switch constituting a main part of this embodiment. When the hit ball wins the start winning port 42, 80a, 80b and the start winning ball detection switch 90 is turned on, it acts as a rotation start signal of the rotating drums 15a to 15c. The variable winning ball device 40 and the starting winning ports 80a and 80b will be described later in detail. Further, in the game area 13, normal winning ports 16a, 16b, 17a, 17b are provided on the left and right sides and the lower side of the variable display device 14. In addition, the game area 13 is provided with a windmill and a number of obstacle nails for changing the falling speed and direction of the falling ball, and is lit or flashed when the player enters the above-mentioned specific game state to give the player the Game effect lamps 19a and 19 to inform the effect
b is provided. Frame lamps 20a, 20b provided on the upper part of the front frame 3 have the same effect as the gaming effect lamps 19a, 19b. These lamps are lit or flashed in a different manner, not only when the rotating drums 15a to 15c are rotating, but also in a specific game state, to excite the atmosphere of the game. ing. Further, at the bottom of the game area 13, there is provided an out port 18 through which a hit ball that has not won any of the above-mentioned winning areas is guided to the rear of the game board 11. Next, the structure of the back of the pachinko gaming machine 1 will be described with reference to FIG. On the back surface of the gaming board 11, a winning ball aggregate cover body 23 having a guiding path formed to guide the winning ball winning each of the winning ports to the left and right while guiding the winning ball downward is fixed. At the approximate center of the winning ball set cover 23, an opening is opened so that a drum mechanism 24 having a drive motor 25 of the variable display device 14 projects rearward.
Below this, a solenoid 26 for opening and closing the opening and closing plate 44 of the variable winning ball device 40 is fixed. On the back side of the variable winning ball device 40, a specific winning ball detection switch 64 for detecting that a hit ball has won the specific winning area 45,
A winning ball detection switch 63 for counting the winning balls winning the opening / closing plate 44 is also provided. Further, the winning prize ball collecting cover body 23 is provided with a starting prize ball detector 90 for the starting prize port. The starting winning ball detectors 90 corresponding to the other starting winning ports 80a and 80b are provided integrally with the starting winning ports 80a and 80b. Further, a relay terminal plate 27 for relaying wires extending from the above-described switches, lamps, drive sources, and the like provided on the game board 11 is attached to the upper portion of the rear surface of the winning ball collecting cover body 23. A mechanism plate 28 covers the entire back surface of the game board 11.
The mechanism plate 28 processes the winning balls one by one, and a predetermined number of prize balls corresponding thereto are processed in the hitting ball supply tray 7 or the surplus ball tray 10 as is well known.
There are provided various mechanisms for discharging the oil to the air. That is, on the front side of the mechanism plate 28, a winning ball collecting gutter 29 for collecting winning balls in one place is formed as shown by a dashed line in FIG. 9, and at the exit of the winning ball collecting gutter 29,
A prize ball processor 30 for processing one prize ball is provided. On the other hand, on the rear side of the mechanism plate 28, a prize ball tank 31, a prize ball alignment gutter 32, a prize ball payout device 33, and a prize ball paid out by the prize ball payout device 33 shown by a dashed line in FIG. A prize ball discharge passage (not shown) that guides the ball to the hit ball supply tray 7 and the surplus ball tray 10 is formed. Note that the hit ball launching device 34 is fixed to the lower portion of the back surface of the front frame 3 as described above. Further, a connection gutter 38 for connecting the prize ball discharge passage (not shown) to the surplus ball tray 10 is also fixed to one side of the hit ball firing device 34. Next, with reference to FIGS. 5, 6A and 6B, the configuration of the variable winning ball device 40 including the mounting mechanism of the passing ball detection switch according to the embodiment will be described. Variable winning ball device 40
Has a mounting board 41 mounted on the game board 11, and the starting winning opening 42 is formed on the mounting board 41. A rectangular opening 43 is opened below the start winning opening 42, and the rear of the opening 43 is a winning area. This prize area is divided into three areas, and a specific prize area is located at the center of the area.
45, normal winning areas 46a and 46b are formed on the left and right, respectively. Further, the opening 43 is provided with the opening / closing plate 44 whose lower end is supported by the support shafts 50a and 50b, as described above, so as to be openable and closable. Accordingly, a ball falling in the game area 13 with the open / close plate 44 opened is received by the open / close plate 44 and guided to either the above-described specific winning area 45 or the normal winning areas 46a, 46b. I have. An enclosing frame 47 is protruded below the mounting board 41,
A front decorative plate 48 is fixed to the front of the surrounding frame 47. In the center of the front decoration plate 48, a winning number display 49 for displaying the number of winning balls received in one open state of the opening / closing plate 44.
Are arranged to face. By the way, the opening / closing plate 44 connects the support shafts 50a and 50b to the mounting substrate 4
1, which is supported on both lower sides and is pivotally supported so as to be openable and closable.On one end on the back side of the open / close plate 44, a stopper 51 is protruded, and the stopper 51 is connected to the plunger 26a of the solenoid 26. The operating member 52 is brought into contact. That is, when the solenoid 26 is excited, the operating member 52 is pulled up, whereby the stopper 51 is rotated,
The opening / closing plate 44 integrated with the stopper 51 rotates to be in an open state. And the open state is the solenoid
While the solenoid 26 is excited, it is held, but when the solenoid 26 is demagnetized, the operating member 52 and the stopper 51 do not come into contact with each other, so that the open / close plate 44 is rotated and closed by its own weight. Further, on the back surface of the mounting board 41, falling spaces 53 and 54 are formed in which hit balls fall in an overlapping manner in the front-rear direction. Among them, the first falling space 53 located in the front, as shown in FIG. 6B, is configured such that the winning balls that have won the normal winning areas 46a and 46b fall, and the second falling space 53 located in the rear. In the falling space 54, as shown in FIG. 6A, the winning ball that has won the specific winning area 45 falls. For this reason, a pair of guiding members 55a and 55b are provided so as to cross the first falling space 53 in order to guide the ball that has fallen substantially to the center of the opening / closing plate 44 to the specific winning area 45. In addition, the first falling space 53 is provided with first passage walls 56a projecting from the back surface of the mounting board 41,
The first passage wall 56a, 5
6b is converged so as to collect the winning prize balls in one place, and a prize ball detection switch 63 as a passing ball detection switch is provided at the exit thereof. The winning ball that has passed through the winning ball detection switch 63 collides with the flow path changing protrusion 62 protruding from the lower portion of the back surface of the mounting board 41 and is guided rearward. Further, the second falling space 54
Is a pair of second passage walls 57a, 57b having an interval of approximately one pachinko ball so as to correspond to the size of the specific winning area 45.
A specific winning ball detection switch 64 as a passing ball detection switch is provided at the exit of the side wall. The specific winning ball detection switch 64 is also used to detect the establishment of the repetition condition of the open state of the open / close plate 44 as described above and to detect the number of hit balls that have won the open / close plate 44. . That is, the number of hit balls that have won the open / close plate 44 is detected and counted by the winning ball detection switch 63 and the specific winning ball detection switch 64. The winning ball detecting switch 63 and the specific winning ball detecting switch 64 as the two passing ball detecting switches described above have substantially the same structure and are mounted by substantially the same mounting mechanism. As shown in FIG. Therefore, first, referring to FIG.
Explaining the structure of 64, the passing ball detection switch 63,
64 is a switch body 65 having a passage hole 66 formed at the end thereof through which a pachinko ball passes, a coil 67 provided around the passage hole 66, and a detection circuit 68 for detecting an induced current generated in the coil 67. Are formed, a cover 73 that covers the circuit board 70 with the switch body 65, and a wiring 72 that is connected to a terminal 71 at the rear end of the circuit board 70. It is. More specifically, the circuit board 70 is formed such that most of the circuit board 70 is housed inside the switch body 65, and only the terminals 71 protrude to the outside. And the circuit board 70
A shield plate 69 is interposed between the switch body 65 and the switch body 65. The shield plate 69 is laid not only on the portion corresponding to the circuit board 70 but also on the entire upper surface of the switch body 65. This is a hole through which a pachinko ball charged with static electricity passes
This is provided to transmit an electromagnetic wave generated by the static electricity or the static electricity discharge when passing through the shield board 69 before the detection circuit 68. Therefore, when attaching the passing ball detection switches 63 and 64,
It is necessary to mount 69 so that it is located on the upstream side with respect to the falling direction of the pachinko ball.If it is mounted upside down, the detection circuit 68 may malfunction or be destroyed by static electricity or electromagnetic waves. is there. The shield plate 69 is connected to a ground line of a control board for controlling a game operation and the like via a wiring 72 (-side) connected to the terminal 71. By the way, the passing ball detection switch having the above configuration
63 and 64 are formed almost symmetrically with respect to a vertical center line (a direction parallel to the paper surface of FIG. 1) passing through the center of the passage hole 66 as a whole, and extend horizontally through the center of the passage hole 66. It is formed vertically symmetrically with respect to the center line of the direction (perpendicular direction to the paper surface of FIG. 1), but only the protruding position of the terminal 71 is not left-right symmetric and not vertical symmetric. That is, as shown in FIGS. 2 and 3, the projecting position of the terminal 71 is slightly upward in the up-down direction and slightly outward in the left-right direction. In this sense, the outer shape of the passing ball detection switches 63 and 64 is
It can be said that it is asymmetric. A description will now be given, with reference to FIG. 2, of a mounting mechanism for mounting the passing ball detection switches 63 and 64 having the asymmetric outer peripheral shape as described above. FIG. 2 shows a state in which the winning ball detection switch 63 of the passing ball detection switches 63 and 64 is mounted. Since the other specific winning ball detection switch 64 is also mounted by exactly the same structure, Illustration is omitted. In order to place the ball exits of the first passage walls 56a and 56b so that the passage holes 66 of the passage ball detection switches 63 and 64 face the attachment holes 58a, 58b (5
8b corresponds to the specific winning ball detection switch 64. In the following, those with "b" after the sign correspond to the specific winning ball detection switch 64), and support plate portions 59a, 59b are protruded, and the lower portion from the center of the passing ball detection switch 63, 64 to the rear is provided. Support,
In addition, the engaging portions 61a, with which the tips of the passing ball detection switches 63, 64 engage with the lower ends of the one of the passage walls 56a of the first passage walls 56a, 56b, respectively.
61b is formed. Of these, the mounting pieces 58a and 58b have their tips bent upwards, and the passing ball detection switch 63,
The support plate portions 59a, 59b are bent upwardly at the rear ends to form the engagement portions 60a, 60b. The engaging portions 60a and 60b abut against the rear end surfaces of the passing ball detection switches 63 and 64 and engage so as not to move in the left-right direction. Also,
The bent height “D ₁ ” of the engaging portions 60 a and 60 b is formed to be longer than the distance “D ₂ ” between the upper surface of the passing ball detection switches 63 and 64 and the terminal 71. Since the mounting mechanism for mounting the passing ball detection switches 63 and 64 is configured with the above structure, there is no problem with the mounting when the mounting is performed in a normal state as shown in FIG. When the passing ball detection switches 63 and 64 are mounted upside down, the terminal 71 is connected to the engaging portion 60 of the support plate portions 59a and 59b.
a, 60b, but not completely stored in the support plate portions 59a, 59b,
The passing ball detection switches 63 and 64 are in an oblique state. For this reason, the operator can easily recognize that the mounting is in the opposite direction, and can immediately turn it over and return to the normal mounting state. As described above, in this embodiment, the protruding position of the terminal 71 is formed to be asymmetrical, and the engaging portions 60a and 60b are formed by using this. The asymmetry of the terminal 71 in the above embodiment is projected not only in the up-down direction but also in the left-right direction as described above. Therefore, as shown in FIG. , 64 may protrude from the mounting board 41 in correspondence with the distance between the terminal 71 and the mounting board 41 that occurs when the mounting board 41 is normally mounted. Also in this case, when the passing ball detection switches 63 and 64 are mounted in the opposite directions, the terminal 71 and the engaging projection 74 come into contact with each other and cannot be mounted accurately. In this case, the engaging portion 60
a, 60b may have a length as shown in FIG. 2,
Alternatively, it may be shorter. Further, since it is sufficient that the outer shape of the passing ball detection switches 63 and 64 is asymmetric, for example, as shown in FIG.
A cutout portion 75 may be formed at one corner of the outer periphery of 66 so that the heads of the passing ball detection switches 63 and 64 may be formed asymmetrically, and an engagement corresponding portion 76 may be formed on the mounting board 41 to correspond to this. . In this case, needless to say, when the mounting is performed in the opposite direction, the mounting cannot be performed accurately and the mounting state can be immediately changed to the normal mounting state. In the above-mentioned embodiment, a switch using a proximity switch is shown as the passing ball detection switches 63 and 64, but a passing ball detection switch of a different type from this may be used. For example, it may be a micro switch like the start winning ball detection switch 90 as a passing ball detection switch built in the above-mentioned starting winning ports 80a and 80b. Referring to FIGS. 7A and 7B, the starting winning port 80a (the other starting winning port 80b has exactly the same configuration, and the description thereof is omitted) is a mounting board mounted on the game board 11. A “U” -shaped winning ball receiving frame 82 projects from the front surface of the mounting substrate 81. A decorative plate 83 is provided on the front surface of the winning ball receiving frame 82, and an engaging portion 84 that engages with the upper end of a starting winning ball detecting switch 90 as a passing ball detecting switch described later is provided on the upper portion of the decorative plate 83. Is protruding,
In addition, the start winning ball detection switch 90 is located at the center of the winning ball receiving frame 82.
A support portion 85 for supporting both ends of the lower portion of the cover is protruded. The distance “D ₄ ” between the support portion 85 and the engagement portion 84 is formed so as to match the vertical length of the tip of the start winning ball detection switch 90. A guiding path 88 for guiding a winning ball to the rear is formed below the mounting board 81, and a rear surrounding frame 86 supporting a rear end of the starting winning ball detection switch 90 is formed above the guiding path 88. Is formed. The rear surrounding frame 86 and the winning ball receiving frame 82 are formed so as to communicate with each other, and a guiding protrusion 87 for smoothly guiding the winning ball to the rear is continuously provided at a lower portion thereof. A mounting piece 89 extending rearward is formed substantially at the center of the rear surrounding frame 86, and an engaging portion 89a is formed at the rear end of the mounting piece 89.
Is projected upward. The engaging portion 89a is engaged with the lower part of the rear end of the start winning ball detection switch 90 to fixedly support the starting winning ball detection switch 90. By the way, the starting winning ball detection switch 90 has a through hole 91 formed at the tip thereof for passing a pachinko ball.
An actuator 92 is inserted inside. Since this actuator 92 is obliquely projected downward from above, when normally mounted, it is pressed by a pachinko ball and pivots about the upper portion, but when mounted in an upside-down direction. Then, there is a problem that the pachinko ball that passes through is stopped and stopped in the passage hole 91. Therefore, if the start winning ball detection switch 90 is erroneously mounted in the reverse direction, the function does not function as the starting winning. At the rear end of the start winning ball detection switch 90, a terminal to which a wiring (not shown) is connected protrudes. The starting winning ball detection switch 90 as a passing ball detecting switch having the above-described configuration has a vertical length `` D ₃ '' at the rear end of the starting winning ball detecting switch 90 which is the vertical length of the tip of the starting winning ball detecting switch 90. D ₄ ". That is, since the upper surface of the start winning ball detection switch 90 is formed in a step shape, the outer peripheral shape of the starting winning ball detection switch 90 is asymmetric with respect to the horizontal center line as shown in FIG. 7B. I have. For this reason, when the start winning ball detection switch 90 is mounted upside down, the leading end cannot be engaged with the lower side of the engaging portion 84, and the rear end thereof is engaged with the engaging portion 89a.
Therefore, the operator notices that the mounting has been performed in the opposite direction, and can immediately reverse the mounting and mount in a normal mounting state. Thus, in this embodiment, the outer peripheral shape of the upper surface of the starting winning ball detection switch 90 as the passing ball detection switch is formed so as to be asymmetrical,
The engagement portion 84 and the engagement portion 89a are formed by utilizing the asymmetry. As described above, the mounting mechanism of the winning ball detection switch 63, the specific winning ball detection switch 64, and the starting winning ball detection switch 90 as the passing ball detection switch according to the embodiment has been described. 64, 90
Are formed so as to be asymmetrical, and utilizing the asymmetry, the engaging portions 60a, 60b, 84, 8 when normally mounted.
9a and the outer periphery of the asymmetrical portion of the passing ball detection switches 63, 64, 90 do not collide, and the engaging portions 60a, 60b, 84, 89a are formed so that they collide when mounted in the opposite direction, This prevents the mounting in the reverse direction, and the passing ball detection switches 63, 64, 90
Normal operation can be ensured. In the above-described embodiment, the passing ball detection switch is changed to the variable winning ball device 40 and the starting winning ball detection switch 80a,
Although it is shown that the pachinko ball is attached to 80b, it is sufficient that the pachinko ball is mounted facing the passage through which the pachinko ball passes. It may be applied to roads. Also, as a structure of a ball game machine, a so-called card-type ball game machine that plays with a sealed game ball may be used, or a so-called arrangement type that acquires a score by a winning combination of hit balls. It may be a pachinko gaming machine.

【The invention's effect】

As is apparent from the above description, the mounting mechanism of the passing ball detection switch in the ball game machine according to the present invention is formed such that the outer shape of the passing ball detection switch is asymmetric, and the passing ball detection switch Utilizing the asymmetry of the outer peripheral shape of the above, the engaging portion that forms an abutment with the outer periphery of the asymmetric portion of the passing ball detection switch when normally mounted and does not abut when mounted in the opposite direction is formed. The operator can notice the mounting in the direction and mount it again in a normal state, so that the normal operation of the passing ball detection switch can be ensured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the internal structure of the passing ball detection switch, FIG. 2 is a side view showing the mounting state of the passing ball detection switch, and FIG. 3 is another mounting state of the passing ball detection switch. FIG. 4 is a plan view showing still another mounting state of the passing ball detection switch. FIG. 5 is a front view of a variable winning ball device to which the passing ball detection switch is applied, FIGS. 6A and 6B.
Fig. 7 is a cross-sectional view showing the structure of the variable winning ball apparatus, Figs. 7A and 7B are front and sectional views of a starting winning port to which a passing ball detection switch is applied, and Fig. 8 is a ball game. FIG. 9 is a front view of a pachinko gaming machine as an example of the machine, and FIG. 9 is a schematic rear view of the pachinko gaming machine. 1. Pachinko game machine (ball game machine) 56a, 56b First passage wall (passing path) 57a, 57b Second passage wall (passing path) 60a, 60b Engaging section 63 Prize Ball detection switch (passing ball detection switch) 64… Specific winning ball detection switch (passing ball detection switch) 74… engaging protrusion (engaging portion) 76… engaging corresponding portion (engaging portion) 82… Winning ball receiving frame (passing path) 84 ... Regulator (engaging part) 89a ... Engaging part 90 ... Start winning prize ball detection switch (passing ball detection switch)

Claims (1)

(57) [Claims] 1. A mounting mechanism for a passing ball detection switch for detecting the passage of a pachinko ball facing a passage through which a pachinko ball passes used in a ball and ball game machine, wherein the outer shape of the passing ball detection switch is asymmetric. In the vicinity of the passage, the outer periphery of the passing ball detection switch does not stop when the passing ball detection switch is normally mounted, but does stop when mounted in the opposite direction. An attachment mechanism for a passing ball detection switch in a ball game machine, wherein an engagement portion is formed.