JP2006255056A - Game machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a fraudulent action of changing a winning probability. <P>SOLUTION: The game machine is provided with a power switch, a key cylinder 36 and a setting change button 37 on the front surface side of a power source box 31. The key cylinder 36 is provided with a main body part 36a and a turning part 36b and a key hole 36c is formed at the turning part 36b. A setting change key 40 is provided with a knob 41 and an insertion part 42. On a surface to be turned downwards when the turning part 36b of the knob 41 is turned to an ON position, a 7-segment LED 43 is provided. The insertion part 42 is provided with a key contact 44, and a cylinder contact is provided inside the turning part 36b. When the insertion part 42 is inserted to the key hole 36c, the turning part 36b is turned to the ON position and the power supply switch 35 is turned ON, a setting value signal is inputted to the 7-segment LED 43 through the cylinder contact, the key contact 44 and a connection wire. The 7-segment LED 43 displays a setting value corresponding to the setting value signal in response to it. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gaming machine such as a slot machine installed and used in a game hall such as a pachinko parlor.

  In this specification, description will be made using medals as game media, but the game media includes other media such as coins. “Medal (game medium) insertion” includes betting a stored (credit) medal with a bet button or the like in addition to actually inserting a medal into the medal insertion slot.

  Slot machines that are installed and used in game halls such as pachinko parlors can give a certain value to medals that are used as game media, and exchange medals earned by playing games for various prizes. it can. In the slot machine, for example, a big bonus (hereinafter referred to as BB) mode or a regular bonus (RB) mode is set as a bonus game mode. In particular, the BB mode is shifted to the RB mode a predetermined number of times, and the RB mode. Before the shift to, the shift to the RB introduction mode in which the winning combination of the small role that can be paid out of a certain medal is increased, a large amount of medals can be obtained in a short period of time. Since the player aims to acquire a large number of medals, it is common to select a table that is easy to obtain the right to shift to the bonus game mode and play the game.

  In a slot machine, it is common to provide first to sixth lottery tables (plural lottery tables) having different winning lottery probabilities. One of the first to sixth lottery tables is selected and set. A setting change button is provided which is operated when the operation is performed. To change the lottery table, for example, open the front door of the slot machine, turn off the main power supply, insert a dedicated change key into the key hole of the key cylinder, and turn the key cylinder rotating part to turn. This is done by turning the main power supply after operating the moving part from the off position to the on position and operating the setting change button. Then, after the lottery table is changed, a game on the changed lottery table becomes possible by rotating the rotation unit from the on position to the off position.

  The selection of the lottery table is often performed after the game hall is closed on a daily basis. For example, a slot machine in which the sixth lottery table with a high winning lottery probability is selected has a lottery probability per day. The slot machine in which the low first lottery table is selected, or the slot machine in which the first lottery table is selected selects the sixth lottery table on the next day. Ingenuity is devised. Since the fact that the lottery table has been changed cannot be detected from the appearance of the slot machine, the game is played fairly for any player.

  By the way, in recent years, foreign objects such as wires and plates have entered the storage box through gaps between the front door and the storage box, or holes that have been intentionally opened in the front door, and the setting change button is operated by the foreign object. In some cases, a so-called goto action is performed to change the lottery table. A person who performs this goto action can gain profits illegally by changing the game from the first to sixth lottery tables to the sixth lottery table having the highest winning lottery probability. The fact that some players gain profits illegally through Goto acts not only causes a loss in the profits of the game hall, but also causes the players to lose interest in games because they cannot play fair games. Adding a function to prevent slotting to a slot machine is one of the major challenges for slot machine manufacturers.

Therefore, in order to prevent the goto action as described above, a door opening / closing detection sensor that detects opening / closing of the front door is provided, and when the door opening / closing detection sensor detects that the front door is closed, the setting change button There has been proposed a slot machine that invalidates the change of the lottery table by the operation (for example, Patent Document 1). In this slot machine, in order to change the lottery table, it is necessary to open the front door, and this action can attract the attention of surrounding players and game hall managers.
JP 2004-135844 A

  However, even in the slot machine of Patent Document 1, the lottery table may be changed by erroneously operating the door opening / closing detection sensor or opening the front door quickly in view of the space of the game hall manager.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a gaming machine capable of preventing an illegal act of changing a winning probability.

  The gaming machine according to the present invention includes a probability change switch that changes a winning probability of at least one of a loser and a plurality of types of winning combinations, a possible position that can be changed by the probability change switch, and an impossible position that cannot be changed. In a gaming machine comprising: a key cylinder that rotates between the key cylinders formed with key holes; and a change key that is inserted into the key holes to rotate the key cylinders. A cylinder contact that is capable of conducting an electrical signal, a key contact that is provided on the change key, is capable of conducting an electrical signal, and contacts and connects to the cylinder contact when the change key is inserted into the key hole; A signal output means for outputting a corresponding probability signal toward the cylinder contact and the change key, and when the cylinder contact and the key contact are connected Characterized by comprising a display unit for displaying the winning probability in response to said probability signal. The signal output means preferably outputs the probability signal when the key cylinder is rotated to the possible position in a state where the cylinder contact and the key contact are in contact with each other. The display unit is preferably connected to the key contact by a wire such as a connection wire. Furthermore, examples of the display unit include an LED and an LCD.

  In addition, it is preferable that the display unit is provided on a surface facing downward or a surface facing upward when the key cylinder is rotated to the possible position with the change key inserted into the key hole.

  According to the gaming machine of the present invention, the probability change switch that changes the winning probability of at least one of the loser and the plural types of winning combinations, the possible position that can be changed by the probability change switch, and the impossible position that cannot be changed A key cylinder having a key hole formed therein, a change key inserted into the key hole to rotate the key cylinder, a cylinder contact provided in the key hole and capable of conducting an electrical signal, A key contact that is provided on the change key and that can conduct electrical signals and connects to the cylinder contact when the change key is inserted into the key hole, and a signal that outputs a probability signal corresponding to the winning probability to the cylinder contact Since it is provided with an output means and a display unit provided on the change key and displaying the winning probability in response to the probability signal when the cylinder contact and the key contact are connected, If you insert a foreign object, tried to change the winning probability manipulating the foreign matter within, because it is not possible to confirm the winning probability after the change, it is possible to prevent that illegally change the winning probability.

  In addition, since the display section is provided on the surface facing downward when the key cylinder is rotated to the possible position, even if the person who performs the goto action illegally obtains the change key, the winning probability is confirmed. It is necessary to look up the change key from below, and the action can attract the attention of surrounding players and game hall managers, so it is possible to prevent the winning probability from being changed more reliably and illegally Can do.

  Furthermore, since the display unit is provided on the surface facing upward when the key cylinder is rotated to a possible position, the game hall manager can easily change the winning probability while confirming the winning probability. it can.

  As shown in FIGS. 1 and 2, the casing 5 of the slot machine 2 is roughly divided into a storage box 6 having an opening 6a on the front surface and a front door 7 that closes the opening 6a so as to be opened and closed. A symbol display window 10 is provided in the upper part of the front door 7, and a first reel 11a, a second reel 11b, and a third reel 11c are rotatably incorporated in the interior of the symbol display window 10. As is well known, various symbols are arranged on the outer circumference of the first to third reels 11a to 11c at a constant pitch, and three symbols per reel are observed through the symbol display window 10 when the reels are stopped. . As a result, a total of five straight winning lines, each of which has a combination of the symbols of each reel, are set, with three horizontal lines and two diagonal lines.

  A credit number display window 12 is provided above the front door 7 and below the symbol display window 10. Behind the credit number display window 12, a credit number display device 13 (see FIG. 5) having a 7-segment LED is provided. In the slot machine 2, it is possible to credit (store) appropriate medals up to 50, and the credit number display device 13 displays the number of credited medals through the credit number display window 12. An error display window 14 is provided on the side of the credit number display window 12. An error code display device (not shown) for displaying an error code through the error display window 14 is provided behind the error display window 14. When there is an abnormality in the machine operation or the game operation, an error code corresponding to the abnormality is displayed through the error display window 14. Note that the credit number display device 13 may be configured with an LCD.

  An operation panel 16 is provided on the front door 7. The operation panel 16 is provided with operation buttons such as a single bet button 17, a MAX bet button 18, a settlement button 19, a start lever 20, a first stop button 21, a second stop button 22, and a third stop button 23. ing. The operation panel 16 is provided with a medal slot 25. Since the functions of these operation buttons and the medal slot 25 are well known, details are omitted.

  When the front door 7 is opened, a hopper unit 30 and a power supply box 31 are provided inside the storage box 6 in addition to the first to third reels 11a to 11c. The hopper unit 30 includes a medal storage box 30a for storing medals inserted from the medal insertion slot 25 when the game is executed, and a hopper device 30b. The medals paid out from the hopper device 30 b are paid out to the medal tray 33 through the medal payout port 32.

  On the front side of the power supply box 31, a power switch 35 for turning on / off the main power supply of the slot machine 2, a key cylinder 36, and a setting change button (probability change switch) 37 are provided. When the power switch 35 is turned on, the main power is turned on and power is supplied to various control devices.

  As shown in FIG. 3, the key cylinder 36 is provided in a cylindrical main body 36 a and is rotatable inside the main body 36 a, and the setting change key 37 cannot be changed by inserting the setting change key 40. And a rotating portion 36b that rotates between an off position (see FIG. 3A) as an impossible position and an on position (see FIG. 3B) as a possible position that can be changed. The rotation portion 36b is formed with a key hole 36c for inserting the setting change key 40. Further, the rotation portion 36b is provided with a lock mechanism (not shown), and when the insertion portion 42 is inserted into the key hole 36c with the key groove 42a facing upward (see FIG. 4). Only the lock is released, and the rotation part 36b can be rotated.

  When the power switch 35 is off (the power of the slot machine 2 is off), the setting change key 40 is inserted into the key hole 36c, and the setting change key 40 is rotated to turn the rotating portion 36b to the off position (see FIG. When the power switch 35 is turned on (the power of the slot machine 2 is turned on) after being rotated from the position 3 (see FIG. 3A) to the on position (see FIG. As will be described in detail later, a plurality of winning tables in the slot machine 10 are provided, and a setting value is assigned to each of them. In the present embodiment, the set value is “1” to “6”, and the set value is “1 → 2 →... → 6 → 1 → 2 → whenever the setting change button 37 is operated once when the setting is changed. ... ”(The winning probability is changed).

  The setting change key 40 includes a resin knob 41 and a metal insertion portion 42 to be inserted into the key hole 36c. A 7-segment LED (display unit) 43 (hereinafter referred to as a 7-segment LED 43) is provided on the right side surface of the knob 41 in FIG. The insertion portion 42 has a key groove 42a formed of a plurality of peaks and valleys only on the upper side surface in FIG. When the insertion portion 42 is inserted into the key hole 36c with the key groove 42a facing upward, the lock of the key cylinder 36 is released, and the rotation portion 36b can be rotated. A key contact 44 capable of conducting an electrical signal is provided at the rear end portion of the lower side surface of the insertion portion 42 in FIG. The key contact 44 is connected to the 7-segment LED 43 via a connection wire (not shown) embedded in the insertion portion 42. The 7-segment LED 43 can display numerical values from 0 to 9.

  As shown in FIG. 4, an electrical signal can be conducted inside the rotating portion 36 b to a position where it contacts the key contact 44 when the insertion portion 42 of the setting change key 40 is inserted into the key hole 36 c. A cylinder contact 45 is provided. Accordingly, when the insertion portion 42 is inserted into the key hole 36 c and the key contact 44 comes into contact with the cylinder contact 45, the key contact 44 and the cylinder contact 45 are connected. The cylinder contact 45 is connected to the CPU 50a of the main control board 50. When the key contact 44 and the cylinder contact 45 are connected, the CPU 50a and the 7-segment LED 43 are connected to the cylinder contact 45, the key contact 44, and the connection wire ( (Not shown).

  The insertion portion 42 of the setting change key 40 is inserted into the key hole 36c of the key cylinder 36, and the rotation portion 36b is rotated from the off position (see FIG. 3A) to the on position (see FIG. 3B). Thereafter, when the power switch 35 is turned on (the power of the slot machine 2 is turned on), the CPU 50 a outputs a set value signal (probability signal) toward the cylinder contact 45. The set value signal input to the cylinder contact 45 is input to the 7-segment LED 43 via the key contact 44 and a connection wire (not shown). The 7-segment LED 43 displays the set value (winning probability) according to the set value signal in response to the input of the set value signal. At this time, since the 7-segment LED 43 faces downward as shown in FIG. 3B, the manager of the game hall changes the setting value while checking the setting value in the viewing direction L, which is the direction of looking up from below. I do. When the rotation unit 36b is rotated to the off position, the CPU 50a stops outputting the set value signal, and the set value displayed on the 7-segment LED 43 is not displayed. In the present embodiment, the CPU 50a also functions as a signal output unit that outputs a set value signal (probability signal) corresponding to a set value (winning probability) when the key contact 44 and the cylinder contact 45 are connected.

  As shown in FIG. 5, the operation of the slot machine 10 is basically controlled by the main control board 50. The main control board 50 is provided with a CPU 50a, a ROM 50b, an electronic lottery unit 50c, and a winning combination determining unit 50d. The ROM 50b stores, for example, a control program such as a game execution program executed by the CPU 50a, control data necessary for executing these programs, and the like.

  The ROM 50b stores first to sixth winning tables 51 to 56 and a setting change program 57. The first to sixth winning tables 51 to 56 are provided so that the winning probabilities for the loser and the plural types of winning combinations are different from each other, and the selected winning table shows the payout probability (payout rate) of medals in the game. Will be different. In the present embodiment, the winning table with the lowest payout rate is the first winning table 51, the winning table with the highest payout rate is the sixth winning table 56, and when the set value is “1”, the first winning table is given. When the table 51 is selected and the set value is “6”, the sixth winning table 56 is selected. Moreover, the 1st-6th winning tables 51-56 should just be provided so that the winning probability of at least any one of a loss and multiple types of winning combination may differ, The number of winning combinations will be changed as appropriate. As a result, by operating the key cylinder 36 and the setting change button 37, at least one of the winning combinations and the plurality of types of winning combinations is changed. Further, the first to sixth winning tables 51 to 56 and the setting change program 57 may be stored in the winning combination determining unit 50d.

  In the present embodiment, when the administrator of the game hall where the slot machine 10 is installed changes the setting value of the slot machine 10, first, the setting change key 40 is inserted into the key hole 36 c of the key cylinder 36 and rotated. When the main power supply of the slot machine 2 is turned on by operating the power switch 35 after the part 36b is turned to the ON position (see FIG. 3B), an activation signal is input to the CPU 50a of the main control board 50. The setting change button 37 is activated and the setting change program 57 is activated. In this state, the setting change button 37 is operated to send a setting change signal to the CPU 50a, thereby changing the setting value. . For example, when the setting value before change is “3” and the setting value is changed to “6”, the setting change button 37 is operated three times. As a result, the set value is changed in order of “3 → 4 → 5 → 6”, the set value becomes “6” after three operations, and when the start lever 20 is operated, the changed set value (“6”) ) Is confirmed. After the setting value is confirmed, when the rotation unit 36b is rotated to the off position (see FIG. 3A), the setting change program 57 is terminated. Then, when the setting change key 40 is removed from the key hole 36c, the setting change is completed.

  Further, after the setting change key 40 is inserted into the key hole 36c of the key cylinder 36 and the rotating portion 36b is rotated to the ON position (see FIG. 3B), the power switch 35 is operated to operate the main part of the slot machine 10. When the power is turned on, the CPU 50a outputs a set value signal to the 7-segment LED 43 via the cylinder contact 45, the key contact 44, and a connection wire (not shown). The 7-segment LED 43 displays a set value corresponding to the set value signal in response to the input of the set value signal. Thereby, the administrator of the game hall can change the set value while confirming the set value. When the rotation unit 36b is rotated to the off position (see FIG. 3A), the CPU 50a stops outputting the set value signal to the 7-segment LED 43, and the set value displayed on the 7-segment LED 43 is non-displayed. Display.

  Sensors are provided inside the single bet button 17 and the MAX bet button 18, and when each button is pressed, a signal is input to the CPU 50a. The CPU 50a determines the number of 1-3 medals inserted prior to the start of the game based on a detection signal from the medal sensor 61 or an input signal from either the 1-bet button 17 or the MAX bet button 18. And determine the number of activated winning lines. Further, the bet number of medals inserted into the medal insertion slot 25 at the start of the game is counted by a credit medal counter (not shown) provided in the CPU 50a, and an operation of pressing the one bet button 17 or the MAX bet button 18 is performed. Thus, every time a medal insertion operation is performed, the bet number of medals is successively subtracted from the credit number.

  A sensor is provided inside the checkout button 19, and a signal is input to the CPU 50a when the checkout button 19 is pressed. When the settlement button 19 is pressed while medals are stored in the credit medal counter, all the medals stored in the credit medal counter are subtracted, and medals for the number of medals stored in the credit medal counter. Are all paid out to the medal tray 33 by the hopper device 30b.

  The start signal sensor 62 is turned on when the start lever 20 is operated. When the start lever 20 is operated, a game start signal is input to the CPU 50a. In response to the game start signal, the CPU 50a rotates the first to third reels 11a to 11c based on the game execution program stored in the ROM 50b and starts game processing.

  The reel drive controller 63 controls the drive and stop of each reel. Each of the first to third reels 11a to 11c is fixed to the drive shafts of the individual stepping motors 65a, 65b, and 65c, and each reel is controlled by controlling the driving of the stepping motors 65a to 65c.

  Since the stepping motors 65a to 65c rotate at a rotation angle corresponding to the number of supplied drive pulses, the CPU 50a controls the rotation angle of the first to third reels 11a to 11c by controlling the number of drive pulses supplied. The stop position of the reel can be determined by stopping the supply of the drive pulse. Each reel is integrally formed with reflection signal portions 66a, 66b, and 66c at the reference position, and the photosensors 67a, 67b, and 67c photoelectrically detect the passage of each reflection signal portion for each rotation. Detection signals from the photosensors 67a to 67c are input to the CPU 50a as a reset signal for each reel.

  The CPU 50a is provided with a pulse counter for each of the stepping motors 65a to 65c, and counts the number of drive pulses supplied to each of the stepping motors 65a to 65c. When the reset signal is input from the photosensors 67a to 67c, the count value of the corresponding pulse counter is cleared. Therefore, the number of drive pulses corresponding to the rotation angle within one rotation of each reel is stored in each pulse counter while being sequentially updated.

  The ROM 50b stores a symbol table, and the symbol table corresponds to the number of drive pulses corresponding to the rotation angle from the reference position of each reel and the symbol code representing each symbol arranged on the reel at a constant pitch. It is attached. Therefore, by monitoring the count value of the pulse counter for each reel, for example, it is possible to identify which symbol has moved on the central pay line, and to what extent the reel is further rotated. It can be predicted whether the symbol of will move on the winning line.

  Sensors are provided inside the first to third stop buttons 21 to 23, and a stop signal for each reel is input to the CPU 50a when the first to third stop buttons 21 to 23 are operated. The start lever 20 is operated to start the rotation of all reels. When these rotations reach a steady speed, the operations of the first to third stop buttons 21 to 23 are validated. Thereafter, by operating these, stop control of the corresponding first to third reels 11a to 11c is started.

  The CPU 50a operates the electronic lottery unit 50c in response to the game start signal. The electronic lottery unit 50c includes a random number generator and a random number sampling circuit, and determines one random value by lottery every time a game is started. The random value determined here is input to the winning combination determining unit 50d. The winning combination determining unit 50d determines what winning combination is to be given in the currently executed game according to the input random number value.

  The hopper device 30b pays out a prescribed number of payout medals to the medal tray 33 according to the type of winning combination. Note that a payout table in which the number of payout medals is determined for each type of winning combination is stored in the ROM 41, and the CPU 50a reads this to drive the hopper device 30b.

  Next, the operation of the slot machine 2 configured as described above will be described. When the administrator of the game hall where the slot machine 10 is installed changes the setting value of the slot machine 10, first, as shown in FIGS. 3 and 4, the key groove 42a of the setting change key 40 is first directed upward. In this state, the insertion portion 42 is inserted into the key hole 36c, the lock of the key cylinder 36 is released, the rotation portion 36b is made rotatable, and the rotation portion 36b is turned to the ON position (FIG. 3B). After the operation, the power switch 35 is operated to turn on the main power supply of the slot machine 2. Then, the setting change button 37 is operated to change the set value.In this state, the key contact 44 and the cylinder contact 45 are The CPU 50a outputs a set value signal to the cylinder contact 45. The set value signal input to the cylinder contact 45 is set via a key contact 44 and a connection wire (not shown). The 7-segment LED 43 is input to the 7-segment LED 43 of the key 40. The 7-segment LED 43 displays a set value corresponding to the set-value signal in response to the input of the set-value signal. In order to face downward as shown in 3 (B), the game hall manager changes the set value while confirming the set value in the visual recognition direction L, which is the direction looking up from below.

  When the start lever 20 is operated after the set value is changed, the changed set value is confirmed. When the rotation unit 36b is rotated to the off position after the setting value is determined, the CPU 50a stops outputting the setting value signal, and the setting value displayed on the 7-segment LED 43 is not displayed. Then, when the setting change key 40 is removed from the key hole 36c, the setting change ends.

  In this way, since the set value is displayed only on the 7-segment LED 43 of the setting change key 40, the wire or the Even if a fraudulent act is performed in which a foreign object such as a board enters the storage box 6 and the setting value is changed by operating the setting change button 37 with the foreign object, Since it cannot be confirmed, it is possible to suppress an illegal act of changing the set value illegally.

  Furthermore, even when the setting change key 40 is stolen by a person who performs an illegal act, when changing the setting value, it is necessary to check the setting value in the viewing direction L, which is the direction of looking up from below. In order to attract the attention of surrounding players and game hall managers, fraudulent acts that illegally change setting values can be more reliably prevented.

  In the above embodiment, the slot machine 2 has been described as an example. However, the present invention can also be applied to various game machines such as a pachinko machine.

  FIG. 6 shows another embodiment. Constituent members similar to those in the above embodiment are given the same reference numerals, and the detailed description thereof is simplified. As shown in FIG. 6, in this embodiment, a 7-segment LED (display unit) 43 is provided on the left side surface of the knob 41 in FIG. The insertion portion 42 of the setting change key 40 is inserted into the key hole 36c of the key cylinder 36, and the rotation portion 36b is rotated from the off position (see FIG. 6A) to the on position (see FIG. 6B). Thereafter, when the power switch 35 is turned on, a set value signal is input from the CPU 50 a to the 7-segment LED 43. In response to the input of the set value signal, the 7-segment LED 43 displays a set value (for example, “6”) corresponding to the set value signal. At this time, since the 7-segment LED 43 faces upward as shown in FIG. 6 (B), the administrator of the game hall changes the setting value while checking the setting value in the viewing direction S, which is the direction looking down from above. I do.

  In this way, the setting value is displayed only on the 7-segment LED 43 of the setting change key 40, and the setting value can be changed while confirming the setting value displayed on the 7-segment LED 43 in the viewing direction S, which is the direction looking down from above. Because foreign matter such as a wire or a plate enters the inside of the storage box 6 through a gap formed between the front door 7 and the storage box 6 or a hole intentionally opened in the front door 7, It is possible to suppress an illegal act of changing the setting value by operating the setting change button 37, and it is possible to easily change the setting value of the slot machine 10.

It is a perspective view which shows the external appearance of the slot machine which implemented this invention. It is a perspective view which shows the structure inside a slot machine. It is a perspective view which shows a key cylinder and a setting change key when a rotation part is located in an ON position and an OFF position. It is a functional block diagram showing an electrical configuration of the slot machine. It is a flowchart which shows the flow of a process of selection of the lottery table in a slot machine. The perspective view showing the key cylinder and the setting change key when the turning unit of the embodiment in which the 7-segment LED is provided on the surface facing upward when the turning unit is turned to the on position is located at the on position and the off position. FIG.

Explanation of symbols

2 Slot machines (game machines)
21 Start lever 35 Power switch 36 Key cylinder 36a Main body 36b Rotating part 36c Key hole 37 Setting change button (probability change switch)
40 Setting change key 41 Knob 42 Insertion part 43 7-segment LED (display part)
44 Key contact 45 Cylinder contact 50 Main control board 50a CPU

Claims (3)

A key that rotates between a probability change switch that changes the winning probability of at least one of the loser and a plurality of types of winning combinations, a possible position that can be changed by the probability change switch, and a disabled position that cannot be changed In a gaming machine comprising a key cylinder formed with a hole, and a change key inserted into the key hole to rotate the key cylinder,
A cylinder contact provided in the keyhole and capable of conducting an electrical signal;
A key contact provided on the change key, capable of conducting an electrical signal and contacting the cylinder contact when the change key is inserted into the key hole; and
A signal output means for outputting a probability signal corresponding to the winning probability toward the cylinder contact;
A gaming machine, comprising: a display unit provided on the change key and displaying the winning probability in response to the probability signal when the cylinder contact and the key contact are connected.   The gaming machine according to claim 1, wherein the display portion is provided on a surface facing downward when the key cylinder is rotated to the possible position in a state where the change key is inserted into the key hole. The gaming machine according to claim 1, wherein the display portion is provided on a surface facing upward when the key cylinder is rotated to the possible position in a state where the change key is inserted into the key hole.

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