JP2008245749A - Pinball game machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pinball game machine capable of easily and surely detecting a so-called pin-bending fraud. <P>SOLUTION: This pinball game machine is provided with a game board 8 disposed with winning means and game pins in a front-side game area 8a, and a game board mounting means 22 provided in a game machine body and detachably retaining the game board 8; is further disposed with a measurement means 41 for measuring a pressure value fluctuating according to the magnitude of a force applied from the side of the game board 8 to the side of the game board mounting means 11 between, for example, the game board mounting means 22 and the game board; and is constituted to determine to be abnormal, when the pressure value measured by the measurement means 41 exceeds a prescribed tolerable range. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ball game machine such as a pachinko machine.

  For example, in a pachinko machine, when a game ball launched from the launch means is guided to the game area via the guide rail, and when the game ball wins one of a plurality of winning holes arranged in the game area, A predetermined number of game balls are paid out as prize balls in accordance with the winning opening.

  In this type of pachinko machine, a game board is mounted on a front frame that is pivotably supported on the front side of the outer frame, and a glass having a glass window corresponding to the game area of the game board on the front side of the front frame. A door, a front opening / closing plate with a storage tray for game balls, and the like are pivotally mounted so as to be freely opened and closed.

  By the way, as a go-to action for this type of pachinko machine, for example, a piano wire is inserted from the gap between the glass door and the front frame, etc., and the game balls are bent so that the game balls are easy to win. The act of doing is a problem.

For such a goth action, in addition to the measures taken on the hardware side (see Patent Document 1) such as closing the gap between the glass door and the front frame to cut off the approach path such as a piano wire, etc. The hall side has dealt with measures such as frequently checking the base value and strengthening the staff's patrol.
JP 2004-275257 A

  However, such a conventional anti-goto measure has a large effect on the side of the game hall, but its effect is not always sufficient, such as stealing the eyes of a store clerk and drilling a hole in a glass door with a drill to bend a game nail, etc. There are also reports of bold cheating.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a ball game machine that can easily and reliably find a so-called nail bending goto action.

  The present invention includes a gaming board 8 in which winning means 26 to 28 and gaming nails 29 are arranged in the front gaming area 8a, and a gaming board mounted on the gaming machine body 1 and detachably holding the gaming board 8. In the ball game machine comprising the means 22, a measuring means 41 for measuring a predetermined type of value that varies depending on the magnitude of the force applied from the gaming board 8 side to the gaming board mounting means 22 side, and the measuring means And an abnormality determining means 73 that determines that an abnormality occurs when the value measured by 41 exceeds a predetermined allowable range.

  According to the present invention, when a piano wire or the like is inserted from the gap of the gaming machine body 1 and the game nail 29 is bent illegally, the measured value of the measuring means 41 exceeds the allowable range and is determined to be abnormal. Therefore, the nail bending goto action can be easily and reliably found.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1-10 has illustrated 1st Embodiment which employ | adopted this invention for the pachinko machine. 1 and 2, reference numeral 1 denotes a gaming machine main body, which includes a rectangular outer frame 2 and a front frame 3 pivotably attached to the front side of the outer frame 2.

  As shown in FIGS. 2 and 3, the front frame 3 has a substantially rectangular shape in front view including a pair of left and right vertical frame portions 4 a and 4 b and a pair of upper and lower horizontal frame portions 5 a and 5 b, For example, it is pivotally supported on the outer frame 2 by a vertical hinge 6 provided on the left vertical frame portion 4a side, and a launching means is provided on the lower mounting portion 3a formed in a horizontally long shape along the upper side of the lower horizontal frame portion 5b. 7 etc., the game board 8 etc. are each arrange | positioned at the upper mounting part 3b of the upper side of the lower mounting part 3a.

  Further, on the front side of the front frame 3, a front opening / closing plate 9 corresponding to the lower mounting portion 3 a and a glass door (front door) 10 corresponding to the upper mounting portion 3 b can be opened and closed by a hinge 11 on the same side as the hinge 6. It is pivotally supported by. The front opening / closing plate 9 is provided with a supply tray 12 for storing game balls to be supplied to the launching means 7, a launching handle 13 for operating the launching means 7, and the like. The glass door 10 is provided with a glass window 14 corresponding to the game area 8a on the game board 8 side, and the player can play the game area of the game board 8 from the front side of the gaming machine main body 1 through the glass window 14. 8a is visible.

  As shown in FIG. 2, the lower mounting portion 3 a is provided with a launching means 7 on the front side, for example, approximately in the center in the left-right direction. A launching game ball is placed on the launching means 7 from the supply tray 12 on the front opening / closing plate 9 side. It comes to be supplied. Further, on the left side of the launching means 7, a payout port 15 for discharging the game balls paid out from the payout means (not shown) to the supply tray 12 on the front opening / closing plate 9 side, etc. on the right side, the lower speaker 16 etc. Are arranged respectively.

  As shown in FIG. 3, the upper mounting portion 3b of the front frame 3 is provided with an opening 21 in the substantially center, and a game board mounting means 22 is provided so as to surround the opening 21. The game board 8 is detachably attached to the means 22 from the front side, and the rear side of the game board 8 is exposed from the opening 21 to the rear side.

  The game board 8 is formed in a substantially rectangular shape by a plywood board or the like, and a guide rail 23 for guiding a game ball fired by the launching means 7 is annularly arranged on the front side thereof as shown in FIG. In addition to the various game parts such as a center case 24 having a symbol display means 24a, a passing gate 25, open / close winning means 26 and 27, non-opening / closing winning means 28, etc. A nail 29 is disposed, and a substrate case storing a control substrate is mounted on the back side.

  The game board mounting means 22 includes an upper support frame 31 provided along the upper horizontal frame portion 5a, a lower support frame 32 provided along the upper side of the lower mounting portion 3a, and a left provided along the left vertical frame portion 4a. In addition to the support frame 33 and the right support frame 34 provided along the right vertical frame portion 4b, a plurality of, for example, two locking means 35a and 35b for releasably fixing the game board 8 are provided.

  The upper, lower, left and right support frames 31 to 34 support the game board 8 at the upper, lower, left and right edges, respectively, and the outer peripheral support parts 31 a to 34 a provided along the outer peripheral surface of the game board 8 and the game board 8. Back support portions (front and rear support portions) 31b to 34b provided along the back surface side are provided.

  Further, one of the support frames 31 to 34, for example, the left support frame 33 protrudes along the front surface side of the game board 8 from the outer periphery support portion 33a side, for example, in addition to the outer periphery support portion 33a and the back surface support portion 33b. A front support portion (front / rear support portion) 33c, and an urging means 33d composed of a leaf spring or the like for urging the end portion (left end portion) of the game board 8 toward the front side support portion 33c on the front side. The left edge portion of the game board 8 is sandwiched from three sides of the outer peripheral surface side and the front and rear side surfaces, and is pressed and supported by the urging means 33d to the front side, that is, the front surface support portion 33c side.

  The locking means (front / rear support portions) 35a and 35b support the game board 8 from the front side on the side opposite to the front support portion 33c. As shown in FIG. Upper lock means 35a is provided near the right end portion, and lower lock means 35b is provided near the right end portion on the lower support frame 32 side. Further, the game board 8 is formed with inwardly recessed notches 36a and 36b on the outer edge side, for example, corresponding to these locking means 35a and 35b.

  As shown in FIGS. 4 to 6, the lock means 35 a and 35 b include a shaft portion 37 in the front-rear direction and a fixed knob portion provided on the front end side of the shaft portion 37 so as to protrude in two radial directions, for example. 38 and a projecting portion 39 projecting radially outward at an axially intermediate portion of the shaft portion 37, for example, are integrally provided, and front sides of the rear support portions 31b and 32b of the upper support frame 31 and the lower support frame 32, respectively. It protrudes in a freely rotatable manner.

  Further, the locking means 35a, 35b has a direction in which the fixed knob 38 can pass back and forth without interfering with the notches 36a, 36b, for example, a release position (indicated by a two-dot chain line in FIG. 6) in a vertical direction, The fixed knob 38 can rotate around the axis in a direction in which the fixed knob 38 cannot pass through the notches 36a and 36b, for example, a horizontal position (shown by a solid line in FIG. 6), and is fixed in the locked position. A knob 38 is engaged with the front side of the game board 8 at the periphery of the notches 36a and 36b.

  For example, on the front side of the game board 8 and in the vicinity of the notches 36a and 36b, an inclined portion 40 where the amount of protrusion to the front side gradually increases corresponding to the rotation trajectory of the fixed knob 38 in the locking direction. When the fixed knob portion 38 is rotated from the release position to the locked position, the fixed knob portion 38 gradually rides on the inclined portion 40 and presses the game board 8 backward.

  Further, the protrusion 39 of the locking means 35a, 35b does not interfere with the notches 36a, 36b when the fixed knob 38 is in the release position, and the fixed knob 38 is rotated from the release position to the lock position. The inner surfaces of the notches 36a and 36b are pressed along the board surface of the game board 8 toward a predetermined reference position. In the present embodiment, the game board 8 is fixed with the lower left portion of the game board mounting means 22 as a reference position, and the protrusion 39 on the upper lock means 35a side is inclined downward toward the reference position (see FIG. 6 (a)), the protrusion 39 of the lower lock means 35b is configured to press the inner surface side of the notches 36a and 36b leftward toward the reference position (FIG. 6B).

  A pressure sensor (measuring means) 41 for measuring the pressure applied from the game board 8 side to the game board mounting means 22 side is provided on or near the game board mounting means 22. The pressure sensor 41 measures, for example, the pressure in the two directions along the board surface of the game board 8, that is, the vertical direction and the horizontal direction, as shown in FIGS. 3 to 5, for example, above and below the outer peripheral support portion 33 a of the left support frame 33. It arrange | positions at each two places on the outer periphery support part 32a of the support frame 32. FIG.

  The outer frame 2, the front frame 3, and the glass door 10 are relatively movable in the front-rear direction (far-near direction) with hinges 6 and 11 as fulcrums. A door opening / closing detection means 48 is provided that can detect whether one of them is open or both are closed by a single detection switch 47.

  As shown in FIGS. 7 and 8, the door opening / closing detection means 48 is provided on the upper horizontal frame portion 5a of the front frame 3 via a pair of left and right guide means 51 and a front biasing position A (FIG. 8 (b)). 8 and a rear pressing position B (FIGS. 8A and 8C), a support base 52 provided to be movable in the front-rear direction, and a detection switch detachably fixed to the support base 52 47, an urging means 53 provided on each guide means 51 side and composed of a compression spring or the like for urging the support base 52 toward the urging position A side, and provided on the glass door 10 and in front of the glass door 10 For example, a projection-shaped pressing portion 54 is provided that presses the support base 52 against the urging means 53 toward the pressing position B when closed to the frame 3 side.

  The support base 52 includes, for example, a box-shaped switch case 55 and a pair of guide portions 57 that are provided on both the left and right sides of the switch case 55 and in which front and rear guide holes 56 are formed. A detection switch 47 is fixed on the side.

  The guide means 51 is provided on the upper horizontal frame portion 5a of the front frame 3 so as to protrude forward, for example, and is provided with a biasing means 53. Further, a guide hole 56 on the support base 52 side is provided in front of the biasing means 53. Are slidably fitted in the front-rear direction.

  The detection switch 47 includes a contact type sensor 58 for sensing the outer frame 2 in a state of projecting backward from the switch case 55, and the sensor 58 is outside when the front frame 3 is opened. Even when the frame 2 is not sensed (FIG. 8C) and the front frame 3 is closed, the outer frame 2 can be sensed when the support base 52 is in the urging position A, that is, when the glass door 10 is open. (FIG. 8 (b)), when the support base 52 is in the pressing position B, that is, the glass door 10 is closed and the pressing portion 54 resists the biasing means 53 and presses the support base 52 backward. The frame 2 is sensed (FIG. 8A).

  The detection switch 47 outputs an ON signal when, for example, the sensor 58 does not sense the outer frame 2, that is, when at least one of the glass door 10 and the front frame 3 is in the “door open state”. When the sensor 58 senses the outer frame 2, that is, when the glass door 10 and the front frame 3 are both in the “door closed state”, they are turned off.

  Next, a configuration for monitoring an abnormality caused by a nail bending goat in the control system of the pachinko machine will be described.

  In the main control board 61 of this embodiment, as shown in FIG. 9, a winning processing means 62 for performing processing relating to winning of a game ball in each winning opening, and a symbol processing means for performing processing relating to symbol variation by the symbol displaying means 24a. 63, in addition to the accessory processing means 64 that performs processing related to the opening / closing operation of the open / close winning means 26, 27, etc., the fraud monitoring means 65 is provided for monitoring abnormalities caused by fraud.

  The fraud monitoring means 65 is for monitoring fraudulent acts such as nail bends, and includes a reference value setting means 71, a reference value storage means 72, an abnormality determination means 73, an abnormality notification control means 74, etc. The fraud monitoring process as shown in FIG. 10 is executed every time.

  The reference value setting unit 71 sets a reference value for measurement by the pressure sensor 41. For example, the reference value storage unit 72 stores the pressure value measured by the pressure sensor 41 at a predetermined timing immediately after power-on. In the fraud monitoring process, on the condition that the transition from the “door open state” to the “door closed state” is detected by the door opening / closing detection means 48, the pressure value measured by the pressure sensor 41 is used. The reference value on the reference value storage means 72 is updated.

  The abnormality determination means 73 is for determining an abnormality related to the game nail. In the fraud monitoring process, the reference value stored in the reference value storage means 72 on the condition that the door is in a closed state, The pressure value measured by the pressure sensor 41 is compared, and when the difference exceeds a predetermined allowable range, an abnormality is determined.

  The abnormality notification control means 74 is for notifying abnormality by a predetermined abnormality notification means, and is configured to operate on condition that the abnormality determination means 73 determines that an abnormality has occurred. The abnormality notifying means may be any one such as a hall computer connected via the external output terminal 77 in addition to the lamp 75, the sound output means 76, and the like.

  Subsequently, the fraud monitoring process (FIG. 10) executed by the fraud monitoring unit 65 for each periodic interrupt will be described in more detail. In the fraud monitoring process shown in FIG. 10, first, based on the detection signal from the door opening / closing detection means 48, the state change of the opening / closing doors (the glass door 10 and the front frame 3) during the previous process and the current process is determined ( S1). Then, the following processing is performed based on the state change.

  That is, when the “door closed state” changes to the “door open state”, for example, a door open command is output to the production control board or the like (S2), and when the “door open state” is maintained. For example, a door open signal is output to the external output terminal 77 (S3).

  When the “door open state” is changed to the “door closed state”, the pressure value is acquired from the pressure sensor 41 by the reference value setting means 71 (S4), and the reference value storage means is obtained from the acquired pressure value. The reference value on 72 is updated (S5). Therefore, for example, when an operation is performed in which the glass door 10 is opened and a force is applied to the game board 8, the reference value is determined by the pressure value after the operation when the glass door 10 is closed thereafter. Updated.

  When the “door closed state” has been maintained since the previous process, the abnormality determination unit 73 acquires the pressure value from the pressure sensor 41 (S6), and the acquired pressure value is the reference value storage unit 72. It is compared with the upper reference value (S7). Then, when the difference is not within the predetermined allowable range, it is determined that there is an abnormality (S8: Yes), and abnormality notification processing is performed under the control of the abnormality notification control means 74 (S9).

  Therefore, when the game nail 29 is bent by inserting a piano wire or the like through the gap between the glass door 10 and the front frame 3 without opening the glass door 10 or the front frame 3, the game is accompanied with the nail bending. Since an external force along the board surface is applied to the board 8 and the pressure value measured by the pressure sensor 41 changes greatly from the reference value on the reference value storage means 72, it is determined to be abnormal.

  Since the game board 8 receives external force also from the game ball falling in the game area 8a, the allowable range of the difference between the pressure value measured by the pressure sensor 41 and the reference value considers the external force received from the game ball, etc. Then, it may be set to an appropriate range.

  As described above, in the pachinko machine of the present invention, the pressure sensor 41 that measures the pressure value that varies according to the magnitude of the force applied from the game board 8 side to the game board mounting means 22 side, and the pressure sensor 41 measures the pressure value. And an abnormality determining means 73 for determining that an abnormality occurs when the pressure value exceeds a predetermined allowable range. Therefore, the game nail 29 is bent illegally by inserting a piano wire or the like through a gap in the gaming machine body 1. In such a case, the value of the pressure sensor 41 exceeds the permissible range and is determined to be abnormal, and the nail bending operation can be detected easily and reliably.

  In addition, a reference value setting unit 71 that sets a value measured by the pressure sensor 41 at a predetermined timing after power-on as a reference value is provided, and the abnormality determination unit 73 sets the value measured by the pressure sensor 41 to the reference value. On the other hand, since it is configured to determine that an abnormality occurs when the allowable range is exceeded, the latest measured value after power-on can be set as a reference value to prevent erroneous detection.

  Open / close doors (front frame 3 and glass door 10) provided on the front side of the gaming machine main body 1 so as to be openable / closable, door open / close detecting means 48 for detecting the open / closed state of the open / close doors 3, 10, and open / close doors 3, 10 And a reference value setting means 71 for setting the value measured by the pressure sensor 41 at that time as a reference value when the door opening / closing detection means 48 detects that the change from the open state to the closed state is performed. The determination unit 73 is configured to determine that the value measured by the pressure sensor 41 is abnormal when the value exceeds the allowable range with respect to the reference value. For example, the determination unit 73 opens the glass door 10 to the game board 8. In such a case, an operation is performed such that a force is applied, and abnormality determination is performed using the measured value after the operation as a new reference value, thereby preventing erroneous determination.

  The gaming machine main body 1 includes a rectangular outer frame 2, a front frame 3 that is pivotably supported by the outer frame 2 and mounted with a game board 8, and is pivotally supported by the front frame 3. The door opening / closing detection means 48 detects the door open state when at least one of the front frame 3 and the glass door 10 is opened, and both the front frame 3 and the glass door 10 are closed. Since the door closed state is detected when the two doors are opened, the open / closed state of the two doors can be detected by one detection means.

  The game board mounting means 22 includes outer peripheral support portions 31 a to 34 a that hold the game board 8 in the direction along the board surface, and the pressure sensor 41 is interposed between the outer peripheral support portions 31 a to 34 a and the outer peripheral surface of the game board 8. Since it is disposed and mounted on the game board mounting means 22 side, it is possible to accurately measure the external force acting on the game board 8 by nail bending or the like, and the work such as replacement of the game board 8 can be performed without any trouble as before. it can.

  The game board mounting means 22 is configured to fix the game board 8 in a state of being pressed to a predetermined reference position side, for example, the lower left side, along the board surface, and on the outer peripheral support portion corresponding to the pressing direction, for example, Since at least one pressure sensor 41 is disposed on the left outer support 33a and the lower outer support 32a, measurement in all directions along the board surface can be performed with a small number of sensors.

  FIG. 11 illustrates a second embodiment of the present invention and shows an example in which not only the external force in the direction along the board surface acting on the game board 8 but also the external force in the front-rear direction is measured.

  As shown in FIG. 11, in this embodiment, on the front support part (front-rear support part) 33c which supports the game board 8 from the front side, and back support parts 31b-34b which support the game board 8 from the back side. For example, the pressure sensor 41 is disposed on the back support 34b.

  As a result, not only the external force in the direction along the board surface of the game board 8 but also the external force in the front-rear direction can be measured, so that it is possible to more accurately detect abnormality due to nail bending or the like.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to these embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, the measuring means 41 may be any means that can measure a value that varies depending on the magnitude of the force applied from the game board 8 side to the game board mounting means 22 side, and a load sensor, a strain sensor, or the like may be used.

  When the game board 8 is configured to be fixed in a state of being pressed toward the predetermined reference position along the board surface as in the embodiment, the measuring means 41 may be provided on the pressing means side. For example, in the case of the embodiment, a measuring means 41 capable of measuring a load or the like acting on the shaft portion 37 of the locking means 35a, 35b (pressing means) may be provided.

  The measuring means 41 for measuring the external force acting on the game board 8 in the direction along the board surface is along the board surface unless the external forces in two directions orthogonal to each other, for example, the vertical direction and the horizontal direction are measured simultaneously. It is not possible to measure external forces in all directions, but, for example, when the main direction in which incorrect nail bending is expected is a specific direction such as the left-right direction, only the external force in that direction is measured. May be.

  In the embodiment, the measuring means 41 for measuring the external force acting on the game board 8 in a predetermined direction is provided only on one side of the game board 8 such as in the left-right direction, for example, left and right depending on the magnitude of the measured value and the reference value. The external force in both directions can be measured, but the game board 8 is arranged on both sides of the predetermined direction, for example, both the left and right sides, the upper and lower sides, and the left and right directions are measured by the measuring means 41 on both sides. The external force may be measured.

  When the measuring means 41 is arranged between the game board mounting means 22 and the game board 8, the measuring means 41 may be provided on the game board mounting means 22 side as in the embodiment, or provided on the game board 8 side. Also good.

  The timing for setting or updating the reference value in the reference value setting means 71 is arbitrary. For example, it may be performed only immediately after the power is turned on and not performed after the door is opened or closed.

  Instead of setting or updating the reference value by the reference value setting means 71, the value of the measurement means 41 may be adjusted to zero, that is, the measurement value at that time may be set to zero. In this case, the abnormality determination unit 73 does not need to obtain the difference between the measurement value by the measurement unit 41 and the reference value, and may determine whether the measurement value by the measurement unit 41 is within a predetermined allowable range.

  The game board 8 may be attached to and detached from the game board mounting means 22 from the rear side of the front frame 3.

  The present invention is not limited to pachinko machines and can be similarly implemented in various ball game machines such as an arrangement ball machine and a sparrow ball game machine.

1 is an overall perspective view of a pachinko machine showing a first embodiment of the present invention. It is a front view in the state where the glass door and front opening / closing plate of the pachinko machine which show the 1st embodiment of the present invention were removed. It is a perspective view of the front frame simple substance of the pachinko machine which shows the 1st embodiment of the present invention. It is a plane sectional view of the game board mounting means of the pachinko machine and its vicinity showing the first embodiment of the present invention. It is side surface sectional drawing of the game board mounting means of the pachinko machine which shows the 1st Embodiment of this invention, and its vicinity. It is a front view of the locking means vicinity of the pachinko machine which shows the 1st Embodiment of this invention. It is side surface sectional drawing of the door opening / closing detection means vicinity of the pachinko machine which shows the 1st Embodiment of this invention. It is a plane sectional view near the door opening / closing detection means of the pachinko machine showing the first embodiment of the present invention. It is a block diagram of the control system of the pachinko machine which shows the 1st Embodiment of this invention. It is a flowchart of the fraud monitoring process which shows the 1st Embodiment of this invention. It is a plane sectional view of the game board mounting means of the pachinko machine which shows the 2nd Embodiment of this invention, and its vicinity.

Explanation of symbols

1 gaming machine body 2 outer frame 3 front frame (open / close door)
8 Game board 8a Game area 10 Glass door (open / close door, front door)
22 Game board mounting means 26 Openable winning means (winning means)
27 Openable winning means (winning means)
28 Non-opening and closing type winning means (winning means)
29 game nail 31a-34a outer periphery support part 31b-34b back support part (front-rear support part)
33c Front support part (front / rear support part)
35a Upper lock means (front / rear support part)
35b Lower locking means (front / rear support part)
41 Pressure sensor (measuring means)
48 Door open / close detection means 71 Reference value setting means 73 Abnormality determination means

Claims (8)

A gaming board (8) in which winning means (26) to (28) and a gaming nail (29) are arranged in the front game area (8a), and the gaming board (8) provided on the gaming machine main body (1). ) Is detachably held in a ball game machine equipped with a game board mounting means (22), and varies depending on the magnitude of the force applied from the game board (8) side to the game board mounting means (22) side. Measuring means (41) for measuring a predetermined type of value, and an abnormality determining means (73) for determining an abnormality when the value measured by the measuring means (41) exceeds a predetermined allowable range. A ball game machine characterized by that. Reference value setting means (71) for setting a value measured by the measurement means (41) at a predetermined timing after power-on as a reference value is provided, and the abnormality determination means (73) is the measurement means (41). 2. The ball game machine according to claim 1, wherein the ball game machine is configured to be determined to be abnormal when a value measured by the value exceeds the allowable range with respect to the reference value. An open / close door (3) (10) provided on the front side of the gaming machine main body (1) so as to be openable and closable; door open / close detection means (48) for detecting an open / closed state of the open / close door (3) (10); When the door opening / closing detection means (48) detects that the opening / closing door (3) (10) has changed from an open state to a closed state, the value measured by the measurement means (41) at that time is detected. A reference value setting means (71) for setting a reference value, and the abnormality determination means (73) is configured such that the value measured by the measurement means (41) exceeds the allowable range with respect to the reference value. The bullet ball game machine according to claim 1, wherein the ball game machine is configured to be determined as abnormal. The gaming machine main body (1) has a rectangular outer frame (2) and a front frame (3) that is pivotally supported so as to be openable and closable with respect to the outer frame (2) and to which the gaming board (8) is mounted. And a front door (10) pivotably supported by the front frame (3), wherein the door open / close detection means (48) includes a front door (10) and a front door (10). The door opening state is detected when at least one of the doors is opened, and the door closing state is detected when both the front frame (3) and the front door (10) are closed. The bullet ball game machine according to claim 3. The game board mounting means (22) includes outer peripheral support parts (31a) to (34a) for holding the game board (8) in a direction along the board surface, and the measurement means (41) is provided to the outer peripheral support part. (31a)-(34a) and an outer peripheral surface of the game board (8), and are mounted on the game board mounting means (22) side or the game board (8) side. Item 5. A bullet ball game machine according to any one of Items 1 to 4. The ball game machine according to claim 5, wherein at least one measuring means (41) is arranged corresponding to the vertical and horizontal directions of the game board (8). The game board mounting means (22) includes front and rear support portions (31b) to (34b) (33c) (35a) (35b) for holding the game board (8) in the front-rear direction, and the measurement means (41) Is disposed between the front and rear support portions (31b) to (34b) (33c) (35a) (35b) and the game board (8) and the game board mounting means (22) side or the game board (8 The bullet ball game machine according to claim 4 or 5, wherein the ball game machine is mounted on the side. 8. A ball game machine according to claim 1, wherein a pressure sensor is used as the measuring means (41).

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