JP2008125848A - Pachinko machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Pachinko machine capable of surely detecting that a screwdriver or pincers are inserted into a space between a front door and an inner frame and applies a fraudulent external force thereto. <P>SOLUTION: A metal resistance strain gage 72 is provided at a central part of a pair of vertical hinge parts 4a and 4b or locking parts 31a and 31b provided in respective left/right sides in the frontal view of a front door 4. The strain detecting direction (x) of the metal resistance strain gage 72 is conformed to the left/right direction of the respective side parts. Consequently, this machine can highly efficiently detect the strain due to bending generated in the side parts of the front door caused by forcedly opening the front door with the screwdriver. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pachinko machine provided with fraud detection means for detecting fraud.

  In the pachinko machine, the inner frame provided with the game board can be opened and closed through a pair of upper and lower hinges provided on the left side of the rectangular outer frame attached to the island facility when viewed from the front. The front door, which is pivotally supported and further provided with a glass window portion with respect to the inner frame, has a structure that is pivotably supported by a pair of upper and lower hinges provided on the left side. A game area of the pachinko machine is provided on the front door side of the game board, and a glass window portion of the front door is arranged at a position covering the game area. Further, an upper plate and a lower plate for receiving the paid-out prize balls are attached below the front door. In order to close and lock the front door and the inner frame, a pair of upper and lower locking portions are provided on the right side opposite to the hinge portion. The locking portion and the above-described hinge portion are arranged up and down avoiding the arrangement at the center portion of each side portion in order to secure a game area as large as possible.

  As one of the fraudulent acts on the pachinko machine with the above configuration, a pair of pants that are directly above the starting prize opening are opened by using a screwdriver or a nail punch between the front door and the inner frame and inserting a piano wire into the game area. There is an act of increasing the winning probability of the game ball by tilting the navel for adjusting the winning rate or opening the open / close door provided in front of the big winning opening.

  In addition to using a screwdriver in this way, as a technique to detect when an improper external force is applied to the pachinko machine, such as shaking or hitting a pachinko machine, it is used to detect the open / closed state of the front door A technique of providing a microswitch or a vibration detection device is known (see, for example, Patent Document 1).

JP-A-62-221380

  However, when detecting a fraud using the vibration detection device described in Patent Document 1, there is a possibility that a thing that cannot be said to be a fraud, such as holding a pachinko machine by hand, may be erroneously detected. . Further, when the microswitch described in Patent Document 1 is provided between the front door and the inner frame, there is a possibility that fraud cannot be detected when a place where the microswitch is not provided is locally opened. . In order to detect such a local prying action without omission, it is inconvenient because it is necessary to mount a large number of microswitches between the front door and the inner frame.

  Accordingly, an object of the present invention is to provide a pachinko machine that can reliably detect when a driver or a nail extractor is inserted between the front door and the inner frame and an improper external force is applied. .

The present invention includes an inner frame in which a game board is provided and a front door having a transparent window portion covering a game area provided in the game board, and the front door is left and right when the front door is viewed from the front. One side part of each side part is connected to the inner frame by a pair of upper and lower hinge parts so as to be openable and closable, and the other side part is a pair of upper and lower locking parts for locking the front door and the inner frame. In the pachinko machine where the part is provided,
A strain detecting element provided on at least one of a central portion between the pair of hinge portions on one side portion of the front door and a central portion between the pair of locking portions on the other side portion;
A pachinko machine comprising: a determination unit that outputs a signal for notification when the output satisfies a predetermined determination criterion based on an output from the strain detection element.

  Further, the present invention is characterized in that the strain detection element is attached so as to detect a strain in the left-right direction when the front door is viewed from the front.

  According to the present invention, the strain detection element is provided in at least one of the central portion between the pair of upper and lower hinge portions on one side portion of the front door and the central portion between the pair of upper and lower locking portions on the other side portion. . The reason why the strain detecting element is arranged at the center of each side in this way is as follows.

  Considering the case of illegally prying between the front door and inner frame of a pachinko machine using a screwdriver or a nail punch, it is not easy to pry from the bottom of the front door because there is an upper plate and a lower plate. Opening from above the door is easy to touch the eyes of others. Therefore, it is generally considered that a person who commits cheating will pry from the side of the front door.

  When prying from the side of the front door, the upper and lower sides of each side are fixed by hinges or locking parts, so the fraudster inserts a screwdriver or the like into the part where the hinges or locking parts are not provided Will do. Then, a member constituting the side portion of the front door is bent by the inserted driver or the like, thereby creating a gap between the front door and the inner frame, and inserting a wire or the like into the game area. Here, when the center portion between the hinge portions or between the locking portions is pry open, the deflection of the front door becomes the largest, and the gap generated between the front door and the inner frame is also maximized. As the position to be pry open is shifted from the central portion and closer to the hinge portion or the locking portion, a larger force is required to create a gap between the front door and the inner frame. Therefore, it is considered that the fraudulent person opens a position as close as possible to the center of each side.

  In addition, when an external force is applied to a member that constitutes the side part of the front door and bending occurs, the compressive stress or tensile stress is maximized on the surface at the position where the external force is applied, and the strain on the surface of the member is increased. The size of is also maximized. Therefore, if a strain detection element is provided at least in the middle between the pair of upper and lower hinges or the locking parts on each side of the front door, the position where the fraudulent person can pry open the space between the hinges or the locking parts. It is considered that a relatively large strain can be detected even if it is slightly deviated from the center portion of the.

  Based on the above examination results, in the present invention, it is possible to reliably detect fraud by arranging a strain detection element in the center between the pair of upper and lower hinges or between the locking parts on each side of the front door. enable.

  Further, according to the present invention, the strain detecting element is attached so as to detect the strain in the left-right direction when the front door is viewed from the front. The reason for setting the mounting direction of the strain detecting element in the above direction is as follows.

  Considering the process of prying between the front door and the inner frame from the side of the pachinko machine using a bar member such as a screwdriver, the fraudster firstly, between the front door and the inner frame, Insert the tip in the direction of the back glass window. Then, using the place where the axially intermediate portion of the inserted rod-shaped member comes into contact with the end of the inner frame as a fulcrum, using the tip of the rod-shaped member as the action point and the base end of the rod-shaped member as the power point, the driver is used as a lever. And bend the front door away from the inner frame. When a force is applied to the front door in this way, the plate-like member constituting the front door is most flexed at the position where the tip of the bar-like member and the front door come into contact. On the other hand, the deflection around the transparent window portion to which a transparent member such as glass or acrylic is fixed is small, and since it is restrained by the hinge portion and the locking portion, the deflection at the edge of the front door is small. .

  Here, when the curvature in the left and right direction of the front door due to bending is compared with the curvature in the up and down direction, a relatively narrow region sandwiched between the edge of the front door and the glass window portion is mainly bent in the left and right direction. Whereas the curvature is large, the curvature is reduced in the vertical direction because a relatively wide region between the pair of upper and lower hinges or locking portions is bent. As a result, the absolute value of the distortion of the surface of the plate-like member constituting the side portion of the front door is greater in the left-right direction of the side portion of the front door than in the vertical direction of the side portion.

  Therefore, by attaching a strain detection element to detect the left-right distortion of the front door so that the distortion in the left-right direction can be detected when the front door is viewed from the front, it is more than detecting the vertical distortion of the front door. An absolute value of a large distortion is detected, and it is possible to reliably determine when an illegal act has occurred. Also, when judging the presence or absence of fraud, it detects when the absolute value of the distortion exceeds a predetermined reference value in order to avoid misjudgment, but compared with the case where the vertical distortion of the front door is detected. If the distortion in the left-right direction is detected, the reference value can be set larger, so that the possibility of erroneous detection can be reduced.

  FIG. 1 is a perspective view showing an appearance of an inner frame 3 in a state in which a front door 4 is opened in a pachinko machine 1 that is an embodiment of the present invention. FIG. 2 is a perspective view showing an appearance of the outer frame 2 in a state where the inner frame 3 is opened in the pachinko machine 1 according to the present embodiment shown in FIG. First, the configuration of the pachinko machine 1 to which the present invention is applied will be described with reference to FIGS.

  As shown in FIG. 2, the pachinko machine 1 is provided with a wooden outer frame 2 that is vertically long in a wooden view for fixing to an island facility, and an inner frame 3 made of synthetic resin is provided on the outer frame 2. These are attached to be openable and closable via a pair of hinge portions 3a and 3b provided above and below the left side portion. A mechanism board 6 is attached to the outer frame 2 side of the opening of the inner frame 3, and a game board 5 is attached to the opposite side of the outer frame 2. The game board 5 is formed with a game area (not shown) in which a large number of nails and winning holes are arranged. The mechanism panel 6 is provided with a control board (not shown) provided with a control circuit such as a microprocessor and a RAM (Random Access Memory) for controlling the pachinko machine 1.

  As shown in FIG. 1, a synthetic resin front door 4 is attached to the upper side of the inner frame 3 through a pair of hinge portions 4a and 4b provided on the upper and lower sides of the left side portion. The front door 4 is provided with a glass window 7 as a transparent window at a position covering the game area. A transparent member that transmits visible light, such as an acrylic plate, may be used for the glass window portion 7. Although not shown, an upper plate and a lower plate for receiving a prize ball to be paid out when a game ball is won are attached to the inner frame 3 below the front door 4. An adjustment handle for adjusting the launching force of the game ball is attached to the inner frame 3 at the lower right corner of the front door 4 as viewed from the front. Hereinafter, in a state where the inner frame 3 and the front door 4 are closed, the front door 4 side is referred to as the front side or the front side with respect to the outer frame 2, and the outer frame 2 side is referred to as the rear side or the back side with respect to the front door 4. The side.

  The outer frame 2, the inner frame 3 and the front door 4 are locked and locked together by a door opening / closing device 8. As shown in FIG. 2, the door opening and closing device 8 is provided on the left side of the inner frame 3 when viewed from the back side, and has a pair of upper and lower bowl-shaped first engaging portions 11 a and 11 b protruding to the front side, And a pair of upper and lower hook-shaped second engaging portions 12a and 12b projecting to the side. The reason why the first and second engaging portions 11a, 11b, 12a, and 12b are provided above and below the intermediate portion of the side portion of the inner frame 3 is to secure a game area as large as possible in the central portion of the inner frame 3 It is to do. For the same reason, the hinge portions 4a and 4b on the left side of the front door 4 are arranged above and below the left side so as to avoid the intermediate portion.

  As shown in FIG. 2, a pair of upper and lower portions for detachably engaging the second engaging portions 12 a and 12 b at positions corresponding to the second engaging portions 12 a and 12 b in the outer frame 2. Second engaged portions 13a and 13b are attached. As shown in FIG. 1, a plate-like front door support member 30 is fixed to the left side of the front door 4 when viewed from the back side, and on the front door support member 30, the first engagement portion 11a is fixed. , 11b is provided with a pair of upper and lower first engaged portions 31a, 31b for detachably engaging the first engaging portions 11a, 11b. Each first engaging portion 11a, 11b and each first engaged portion 31a, 31b with which they are engaged constitute a locking portion. Further, a cylinder lock 32 is installed at a substantially central position in the vertical direction of the front door support member 30 so that the keyhole protrudes to the front side. The door opening and closing device 8, the front door support member 30, and the first and second engaged portions 31a, 31b, 13a, and 13b are formed using a metal plate or a hard synthetic resin plate.

  The door opening / closing device 8 described above shows an example of a known mechanism for locking the inner frame 3 and the front door 4 (see, for example, JP-A-10-309363). Hereinafter, the door opening / closing mechanism of the door opening / closing device 8 used in the present embodiment will be outlined.

  FIG. 3 is a perspective view showing an appearance of the door opening / closing device 8 in the pachinko machine 1 according to the present embodiment shown in FIGS. The door opening / closing device 8 includes an inner frame support member 16 fixed to the left side when viewed from the back side of the inner frame 3, and a front door operation rod provided so as to be slidable vertically with respect to the inner frame support member 16. 18 and an inner frame operation rod 20 are configured.

  The front door operating rod 18 is a vertically long and substantially rectangular plate-like member, and the first engaging portions 11a and 11b are provided at both ends in the longitudinal direction. Also, a first cam engaged portion 24 that engages a first cam engaging portion 34 of a cam 33 described later is formed near the center in the longitudinal direction.

  The inner frame operation rod 20 is a vertically long and substantially rectangular plate-like member like the front door operation rod 18, and the second engagement portions 12a and 12b are provided at both ends in the longitudinal direction. Further, a second cam engaged portion 25 to be engaged with a second cam engaging portion 35 of a cam 33, which will be described later, and an inner portion for further opening the inner frame 3 after the front door 4 is opened are located near the center in the longitudinal direction. A frame opening lever 26 is provided.

  The inner frame support member 16 has an L-shaped cross section, a fixed piece 16a fixed to the left side when viewed from the back side of the inner frame 3, and a guide formed at a right angle from one end in the width direction of the fixed piece 16a. And a piece 16b. A plurality of guide protrusions 21 for slidably holding the front door operation rod 18 and the inner frame operation rod 20 are formed on the fixed piece 16a. Specifically, the front door operation rod 18 and the inner frame operation rod 20 are overlapped on the guide piece 16b in this order, and are guided by the guide projection piece 21, whereby the front door operation rod 18 and the inner frame support member 16 are guided. The inner frame operation rod 20 is slidable. Further, springs 22 and 23 are provided between the fixed piece 16a and the front door operating rod 18 and the inner frame operating rod 20, respectively. The front door operating rod 18 and the inner frame operating rod 20 are attached vertically upward. Be forced. In addition, a groove portion 27 that is elongated in the vertical direction is formed at the upper end portion of the inner frame support member 16, and further, a first elongated hole portion 28 and a second elongated hole portion 29 that are elongated in the vertical direction near the center portion and the lower end. Each is formed. The groove portion 27 is provided for projecting the first engaging portion 11a on the upper end side to the front side of the pachinko machine 1, and the first long hole portion 28 includes the first cam engaged portion 24 and the second cam engaged portion. The joint portion 25 and the inner frame release lever 26 are provided to project to the front side, and the second long hole portion 29 is provided to project the first engagement portion 11b on the lower end side to the front side. When the front door 4 or the inner frame 3 is opened, the front door operating rod 18 or the inner frame operating rod 20 is pushed down from the normal state, so that the groove 27, the first long hole portion 28 and the second long hole portion 29 Long.

  As shown in FIG. 3, a cam 33 is provided on the rear side of the cylinder lock 32 fixed to the front door 4 so as to be rotatable around a rotation shaft 36 of the cylinder lock 32. The cam 33 has a first cam engagement portion 34 formed on the left side when viewed from the front, and a second cam engagement portion 35 formed on the right side. The first cam engaging portion 34 extends in a direction perpendicular to the rotation shaft 36 and abuts on the first cam engaged portion 24 of the front door operating rod 18 described above. When the cylinder lock 32 rotates counterclockwise, that is, when the first cam engaging portion 34 is rotated downward, the front door operating rod 18 is pushed downward via the first cam engaged portion 24, and the front door The operating rod 18 slides downward against the spring 22. As a result, the engagement between the first engaging portions 11a and 11b and the first engaged portions 31a and 31b is released, and the front door 4 is opened. The second cam engagement portion 35 extends in a direction parallel to the rotation shaft 36 and abuts on the second cam engaged portion 25 of the inner frame operating rod 20 described above. When the cylinder lock 32 is rotated clockwise, that is, when the second cam engagement portion 35 is rotated downward, the inner frame operation rod 20 is pushed downward via the second cam engaged portion 25, and the inner frame operation is performed. The rod 20 slides downward against the spring 23. As a result, the engagement between the second engaging portions 12a and 12b and the second engaged portions 13a and 13b is released, and the inner frame 3 is released. In order to open the inner frame 3 after the front door 4 is opened, the inner frame operating lever 20 is slid downward against the spring 23 by manually pushing the inner frame release lever 26 downward.

  As one of the illegal acts with respect to the pachinko machine 1 configured as described above, there is an act of using a tool such as a screwdriver or a nail remover. Specifically, the cheating person pry open between the front door 4 and the inner frame 3 using a screwdriver or a tool such as a nail remover, and a wire member such as a piano wire or a synthetic resin such as an acrylic board from the generated gap. Insert the thin plate. And, for example, by changing the inclination of a pair of winning navel nails for adjusting the winning rate directly above the starting winning opening, or opening the open / close door provided on the front of the winning winning opening, Win prize balls illegally. In order to prevent such fraud, it is necessary to detect that the front door 4 and the inner frame 3 are opened by a driver or the like, which is the first stage of fraud. This is effective because it can be prevented. Then, the process of prying between the front door 4 and the inner frame 3 of the pachinko machine 1 using a rod-like member such as a screwdriver will be examined next.

  4 is a perspective view schematically showing a state in which the driver 60 is inserted between the front door 4 and the inner frame 3 to open the front door 4 in the pachinko machine 1 according to the present embodiment shown in FIGS. FIG. Usually, the front door 4 is configured by a front-side resin molded member and a back-side back plate that are decorated so as to be lightweight as a whole. The back plate is made of synthetic resin or metal. It is also possible to integrally mold the front side member and the back plate using a synthetic resin. The two-dot chain line shown in FIG. 4 is an exaggerated representation of the surface shape on the back side of the back plate.

  Examining the process of illegally prying between the front door 4 and the inner frame 3 of the pachinko machine 1 using a rod-like member such as a screwdriver 60, the upper plate and the lower plate (both from the lower side of the front door 4) (It is not shown in the figure), and it is not easy to open the front door 4 from above. Therefore, it is considered that a person who performs a fraudulent act will pry from the side of the front door 4.

  When prying from the side of the front door 4, the upper and lower sides of each side are hinged portions 4 a and 4 b, and the first engaging portions 11 a and 11 b and the first engaged portions 31 a and 31 b are engaged with each other. Since it is fixed by the portion, the fraudster inserts a rod-like member such as the driver 60 from the portion where the hinge portions 4a and 4b and the locking portion are not provided. For example, FIG. 4 shows that a rod-shaped member such as the shaft 61 of the driver 60 is moved from the edge 65 of the front door 4 to the glass window at the center between the pair of upper and lower hinges 4a and 4b on the left side when viewed from the front. The case where it is inserted in the direction closer to 7 is shown.

  As shown in FIG. 4, the fraudster acts as a point of action where the tip of the shaft 61 of the inserted driver 60 contacts the back plate of the front door 4, and the edge of the shaft 61 of the driver 60 and the edge of the inner frame 3. It is considered that the front door 4 is bent and separated from the inner frame 3 by using the driver 60 like a lever with the position 62 where the contact is made as a fulcrum and the base end portion 64 of the handle of the driver as an operating point. When force is applied to the front door 4 in this way, the back plate of the front door 4 bends best where the tip of the shaft 61 of the driver 60 abuts. On the other hand, since the bending around the glass window portion 7 to which the glass having a relatively large elastic coefficient is fixed is small and is restrained by the hinge portions 4a and 4b and the locking portion, the edge of the front door 4 is used. Deflection at 65 is small. When the back plate of the front door 4 is bent, a compressive stress is generated on the surface on the back surface side of the back plate, and negative strain is generated. On the front surface of the back plate, tensile stress is generated and positive strain is generated. The absolute value of the distortion becomes the largest at the place where the tip of the shaft 61 of the driver 60 abuts.

  Here, when the curvature in the left-right direction X of the front door 4 due to bending is compared with the curvature in the up-down direction Y, the left-right direction X is relatively narrow between the edge 65 of the front door 4 and the glass window 7. In contrast, the curvature of the vertical direction Y is small because the relatively wide region sandwiched between the pair of upper and lower hinge portions 4a and 4b or the locking portion is bent. As a result, the absolute value of the distortion of the back plate on the side portion of the front door 4 is larger in the left-right direction X of the side portion of the front door 4 than in the vertical direction Y of the side portion.

  The above examination results are the same when the position where the driver 60 is inserted is shifted in the vertical direction Y of the front door 4, and the absolute value of the distortion is the largest at the place where the tip portion of the shaft 61 of the driver 60 abuts. Further, the absolute value of the distortion in the lateral direction X of the side portion is larger than the absolute value of the distortion in the vertical direction Y. However, as the position where the external force is applied to the back plate of the front door 4 is closer to the upper and lower hinge portions 4a, 4b or the locking portion, a larger force is required to create a gap. It is thought that the position close to the center of each side is pry open.

  Therefore, the strain detection element is provided so that the magnitude of the strain in the left-right direction X of each side portion can be detected at the center portion between the pair of upper and lower hinge portions 4a, 4b or between the locking portions on each side portion of the front door 4. If provided, a relatively large distortion can be detected and the presence or absence of fraud can be reliably determined. Even if the position where the driver 60 is inserted is slightly shifted in the vertical direction Y from the central portion, the deflection of the back plate of the front door 4 at the central portion is larger than the vicinity of the hinge portions 4a and 4b and the locking portion. It is considered that distortion can be detected with sufficient sensitivity. Therefore, next, a strain detection element used in the present embodiment, a distortion determination circuit and a determination procedure for determining the presence / absence of fraud using the strain detection element will be described.

  FIG. 5 is an explanatory diagram for explaining the principle of the strain detection element of the present embodiment. FIG. 6 is a front view showing an example of the configuration of the strain detection element of the present embodiment.

  The strain detection element of the present embodiment refers to an element that detects elongation or contraction per unit length in a predetermined detection direction. Specifically, a metal resistance strain gauge that measures a change in metal resistance using a metal thin film formed on a film-like insulator, and a semiconductor strain gauge that uses the resistance of a semiconductor such as silicon can be exemplified. it can.

  The principle of the strain detection element will be described with reference to FIG. In FIG. 5, it is assumed that a tensile force P acts on both ends of a rod-shaped material 70 having a length L, the length increases by ΔL, and is deformed to L + ΔL. The value ε of the length increment ΔL and the original length L at this time is called strain. The magnitude of this strain ε can be detected by measuring the resistance of the material 70. Specifically, in FIG. 5, the resistance when a current is passed in the length direction of the material 70 having the length L is R, and the resistance of the material 70 when the length is expanded to L + ΔL by the tensile force P is ΔR. Assuming that the resistance changes to R + ΔR, the relationship between the resistance change corresponding to the generated strain and the strain is expressed by the following equation (1). In Equation (1), K is a constant called a gauge factor and is determined by the material 70. In the equation (1), when the length increment ΔL is negative, that is, when the material L contracts in the length direction, the resistance increment ΔR becomes negative and the strain ε also becomes negative.

  The strain detection element shown in FIG. 6 is a uniaxial metal resistance strain gauge 72 and has high detection sensitivity in the left-right direction of FIG. The left and right direction in FIG. 6 with high detection sensitivity is referred to as the x direction or the strain detection direction, and the up and down direction in FIG. 6 perpendicular to the x direction is referred to as the y direction. The metal resistance strain gauge 72 is used by being attached to an area where strain is measured using an adhesive.

  In FIG. 6, the metal resistance strain gauge 72 includes a thin electric insulator base 73 and a linear metal wiring pattern 74 which is formed on the surface of the base 73 and is folded back in a large number of shapes. The metal wiring pattern 74 is formed by etching a metal foil. Specifically, the metal wiring pattern 74 includes a detection unit 74a in which a plurality of linear patterns extending in the x direction are arranged in parallel to each other, and folded portions 74b provided at both ends of the detection unit 74a in the x direction. The length of the portion 74a in the x direction is longer than the interval between the linear patterns. Then, strain measurement is performed by detecting a change in resistance caused by expansion and contraction of the linear pattern formed in the detection unit 74a in the x direction. Further, the metal resistance strain gauge 72 of FIG. 4 is provided with electrode pads 75 formed at both ends of the metal wiring pattern 74 and lead lines 76 connected to the electrode pads 75. The lead line 76 is connected to a distortion detection circuit 90 described later with reference to FIG.

  As described above with reference to FIG. 4, when distortion in the left-right direction X of each side portion of the front door 4 is detected, the detection sensitivity of distortion caused by fraud is high. Therefore, when performing strain detection using the metal resistance strain gauge 72 shown in FIG. 6, it is preferable that the x direction, which is the strain detection direction, coincides with the left-right direction X of each side portion of the front door. Furthermore, the metal resistance strain gauge 72 is preferably arranged at the center between the pair of upper and lower hinges 4a, 4b on each side or between the pair of upper and lower locking portions. An example of the arrangement of such a metal resistance strain gauge 72 is shown in FIG. In FIG. 1, the metal resistance strain gauge 72 may be affixed to the surface on the back side of the back plate of the front door 4 or may be affixed to the front side surface of the back plate inside the front door 4. . In addition, when it affixes on the back surface side of the front door 4, a protective film is provided on the surface of the metal resistance strain gauge 72 so that the metal resistance strain gauge 72 is not damaged. Although not shown in FIG. 1, the mechanism panel on the back side of the inner frame 3 passes through the inside of the front door 4 from the metal resistance strain gauge 72 and through the side portion on which the hinge portions 4 a and 4 b are provided. Electrical wiring up to 6 is provided. This electrical wiring is connected to a strain detection circuit 90 described later on a control board (not shown) provided on the mechanism panel 6.

  FIG. 7 is a block diagram showing a configuration of the distortion detection circuit 90 in the pachinko machine 1 according to the present embodiment.

The strain detection circuit 90 of the fraud detection device of the pachinko machine 1 according to the present embodiment includes a Wheatstone bridge configured by the metal resistance strain gauge 72 and the first to third resistors 91 to 93, and a Wheatstone bridge. A DC power supply 94 for applying the input voltage Vcc, a differential amplifier 95 for amplifying the output voltage from the Wheatstone bridge, and an A / D converter (analogue) for digitally converting the input voltage Vcc and the amplified output voltage / Digital converter) 96 and 97, and a microcomputer 98 for calculating the distortion ε from the digitized input voltage Vcc and output voltage. The microcomputer 98 includes a microprocessor, a RAM (Random Access Memory) and a ROM (Read) which are not shown.
Only memory). Each component of the strain detection circuit 90 is arranged on a control board provided on the mechanism panel 6 except for the metal resistance strain gauge 72.

  Here, the connection relationship of the Wheatstone bridge constituted by the metal resistance strain gauge 72 and each of the resistors 91 to 93 will be specifically described. First, a direct current is applied to each end of the first resistor 91 and the second resistor 92. A power supply 94 is connected and a positive voltage Vcc is input. The other end of the first resistor 91 is connected to the other end of the metal resistance strain gauge 72 having one end grounded, and the other end of the second resistor 92 is grounded. The other end of the third resistor 93 is connected. With this connection, the potential generated between the first resistor 91 and the metal resistance strain gauge 72 is Va, and the potential generated between the second resistor 92 and the third resistor 93 is Vb. Then, the potential difference ΔV = Va−Vb is input to the differential amplifier 95 as the output voltage from the Wheatstone bridge, and the amplified output voltage ΔV is input to the microcomputer 98.

Next, the principle of measuring the strain ε using the strain detection circuit 90 shown in FIG. 7 will be described.
The resistance values of the first to third resistors 91 to 93 and the resistance value of the metal resistance strain gauge 72 in a state where no strain ε is generated are R [Ω], and the strain ε is applied to the metal resistance strain gauge 72. The increment of resistance when it occurs is ΔR [Ω]. At this time, the values of the potentials Va and Vb and the value of the potential difference ΔV = Va−Vb are expressed by the following equations.

式（２）に式（１）を代入して、歪εについて解くと次式（３）が得られる。

Substituting equation (1) into equation (2) and solving for strain ε yields the following equation (3).

  As apparent from equation (3), the strain ε is calculated by giving the input voltage Vcc to the Wheatstone bridge, the output voltage ΔV from the Wheatstone bridge, and the gauge factor K of the metal resistance strain gauge 72. Can do. In the strain detection circuit 90 shown in FIG. 7, the microcomputer 98 stores the gauge factor K in advance, digitally converts the input voltage Vcc and the output voltage ΔV, and inputs the digital voltage to the microcomputer 98. ) To obtain the strain ε. Based on the obtained distortion ε, the microcomputer 98 determines whether or not there has been an illegal act, and outputs a signal for notification when determining that there has been an illegal act. That is, the microcomputer 98 functions as a determination unit.

  Here, when the metal resistance strain gauge 72 is broken and disconnected by an unauthorized person, the value of Va becomes equal to Vcc, and the value of Vb becomes equal to Vcc / 2. Therefore, the output voltage becomes ΔV = Va−Vb = Vcc / 2, which is a value much larger than that when not disconnected, and the differential amplifier 95 overflows. By making use of this fact and making it possible to detect when the output voltage ΔV is greater than or equal to a predetermined value, it is possible to determine when the metal resistance strain gauge 72 has been destroyed by an unauthorized person.

Next, a specific determination procedure for the presence or absence of fraud will be described.
FIG. 8 is a flowchart showing a procedure for determining the presence or absence of fraud by the microcomputer 98 constituting the distortion detection circuit 90 shown in FIG. The procedure shown in FIG. 8 is started by turning on the power to the pachinko machine 1. The following procedure is executed by the microprocessor constituting the microcomputer 98 unless otherwise specified. Further, since the detected distortion includes both positive and negative, the magnitude of distortion ε represents the absolute value of the distortion.

In step s1, the reference value ε _s of the strain magnitude is read from the ROM storage area, stored in the reference value storage area of the RAM, and the process proceeds to the next step s2.

  In step s 2, the input voltage Vcc to the Wheatstone bridge of the distortion detection circuit 90 and the output voltage ΔV from the Wheatstone bridge are digitally converted by the A / D converters 96 and 97. Thereafter, the data is input to the microcomputer and stored in the voltage storage area of the RAM.

  In the next step s3, the magnitude of distortion ε is calculated from the input voltage Vcc and the output voltage ΔV stored in the RAM.

In the next step s4, the microprocessor determines whether the strain magnitude ε is equal to or greater than a predetermined reference value ε _s . When the strain magnitude ε is equal to or greater than the reference value ε _{s, the} process proceeds to step s5, and when it is less than the reference value ε _s , the process returns to step s2, and again the input voltage Vcc to the Wheatstone bridge of the strain detection circuit 90 and the output from the Wheatstone bridge. The voltage ΔV is measured.

  In step s5, a signal is output for notifying that there has been a fraud by sound and light, or for outputting to a computer for pachinko hall management. This completes the procedure for determining the presence or absence of fraud.

As described above, since it is determined by the microprocessor that a change in the magnitude of the distortion equal to or greater than the predetermined reference value ε _s has occurred, there may be cases where it cannot be said that it is an improper act of holding the pachinko machine 1 by hand. It will not be detected. Further, a metal resistance strain gauge 72 is installed at the center between the hinges 4a, 4b on each side of the front door 4 or between the locking parts, and the strain detection direction x coincides with the left-right direction X on each side. Therefore, a relatively large strain can be reliably detected. Therefore, according to the pachinko machine 1 of the present embodiment, the player is less likely to feel uncomfortable by notifying the erroneous detection.

  The above-described embodiment is merely an example of the present invention, and the configuration can be changed within the scope of the present invention. For example, in the above-described embodiment, since it is assumed that the driver is used like a lever, the x direction which is the strain detection direction of the metal resistance strain gauge 72 is made to coincide with the left and right directions as shown in FIG. It is also possible to set the detection direction to the vertical direction in FIG. For example, when a gap is created by inserting a plurality of drivers between the inner door 3 and the outer frame 4 without using the driver like a lever, the vertical deflection is greater than the horizontal deflection. Conceivable. In this case, it is more effective to match the strain detection direction with the vertical direction. Furthermore, if a biaxial strain gauge capable of detecting in the left and right directions and the up and down directions is used, fraud can be detected more accurately.

  Further, in the strain detection circuit 90 shown in FIG. 7, for the sake of simplicity, the size of the first to third resistors 91 to 93 is the same as the resistance value R of the metal resistance strain gauge 72 when there is no strain. The sizes of the first to third resistors 91 to 93 may be R1, R2, and R3, respectively, and may have resistance values different from the resistance value R of the metal resistance strain gauge 72. When the resistance value is set and the relational expression R1: R2 = R: R3 is satisfied, the output voltage ΔV of the Wheatstone bridge bridge becomes 0 [V] when the metal resistance strain gauge 72 is not strained. When the strain ε is generated in the metal resistance strain gauge 72 and the resistance is increased by ΔR [Ω], an output voltage ΔV corresponding to the increase in the resistance is obtained, so that it is similar to the case described with reference to FIG. The magnitude of distortion can be obtained.

  Further, in the flowchart shown in FIG. 8, although the magnitude of the distortion, which is a value obtained by dividing the length increment by the original length, is compared with the measured distortion, the length is determined without comparing the distortion. The same effect can be obtained by comparing the increment of the value with the reference value of the increment of the length.

Further, in the flowchart shown in FIG. 8, the strain magnitude ε ₀ in the initial state when the power is turned on is first measured, and in step s4, the current strain magnitude ε and the initial strain magnitude ε ₀ are determined. The difference ε−ε ₀ may be compared with a reference value ε _s for the magnitude of strain. The output voltage in the initial state in which the resistance value of the first to third resistors 91 to 93 fluctuates due to the change of the ambient temperature or the differential amplifier 95 drifts and the metal resistance strain gauge 72 is not distorted. In some cases, a finite value may occur in ΔV. In such a case, obtaining the difference from the initial state is effective for accurate measurement.

In the pachinko machine 1 which is one Embodiment of this invention, it is a perspective view which shows the external appearance of the inner frame 3 in the state which the front door 4 opened. It is a perspective view which shows the external appearance of the outer frame 2 in the state which the inner frame 3 opened with the pachinko machine 1 of this Embodiment shown in FIG. In the pachinko machine 1 of this Embodiment shown to FIG. 1, 2, it is a perspective view which shows the external appearance of the door opening / closing apparatus 8. FIG. In the pachinko machine 1 of this Embodiment shown to FIG. 1, 2, it is a perspective view which shows typically the state which inserted the driver 60 between the front door 4 and the inner frame 3, and pry open the front door 4. FIG. It is explanatory drawing for demonstrating the principle of the strain detection element of this Embodiment. It is a front view which shows an example of a structure of the distortion | strain detection element of this Embodiment. It is a block diagram which shows the structure of the distortion detection circuit 90 in the pachinko machine 1 of this Embodiment. It is a flowchart which shows the procedure which determines the presence or absence of fraud by the microcomputer 98 which comprises the distortion | strain detection circuit 90 shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Pachinko machine, 2 Outer frame, 3 Inner frame, 3a, 3b, 4a, 4b Hinge part, 4 Front door, 5 Game board, 6 Mechanism board, 7 Glass window part, 8 Door opening and closing device, 11a, 11b 1st person 12a, 12b second engaged portion, 13a, 13b second engaged portion, 31a, 31b first engaged portion, 32 cylinder lock, 72 metal resistance strain gauge, 90 strain detection circuit

Claims (2)

Including an inner frame provided with a game board and a front door having a transparent window part covering a game area provided in the game board, and the front door has left and right sides when the front door is viewed from the front. One side part is connected to the inner frame by a pair of upper and lower hinge parts so that it can be opened and closed, and the other side part is provided with a pair of upper and lower locking parts for locking the front door and the inner frame. In pachinko machines,
A strain detecting element provided on at least one of a central portion between the pair of hinge portions on one side portion of the front door and a central portion between the pair of locking portions on the other side portion;
A pachinko machine comprising: a determination unit that outputs a signal for notification when the output satisfies a predetermined determination criterion based on an output from the strain detection element.   The pachinko machine according to claim 1, wherein the strain detection element is attached so as to detect lateral strain when the front door is viewed from the front.

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