JPH0119983Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an anti-tampering device for a ball game machine which uses a ball detecting magnetic element to detect the falling of a ball to a ball receiving part. This system is designed to prevent fraud caused by malfunctioning the system.

For example, in a so-called mahjong ball machine that allows players to play mahjong with balls launched by a ball-hitting handle, a large number of ball receivers are arranged horizontally at the bottom of a nailed board surface, and each ball receiver has a corresponding one. A magnet that moves when the ball falls and a ball detection magnetic element that operates when the magnet moves are provided, and the magnetic element can detect the ball falling into the ball receiver, and the mahjong ball machine It allows for centralized management. However, since the ball detecting magnetic element is operated by a magnet, there is a risk that a player may bring a magnet and bring it close to the detecting magnetic element, causing it to malfunction, which could lead to fraud.

The present invention solves the above problems, and its features include a magnet that moves when the ball falls, and a ball detection magnetic element that operates due to the movement of the magnet, which corresponds to the ball receiver. In the ball game machine, the magnetic element detects the falling of a ball to the ball receiver, the ball detecting magnetic element is provided with a primary coil to which an alternating current power is applied and an output current connected to the ball detecting magnetic element. A magnetic detector is provided in which a secondary coil that generates the ball is wound internally and externally around the same core so that the magnet does not operate, and a magnet that causes the ball detection magnetic element to malfunction due to a decrease in the output current of the detector is provided. The point is that it can be detected.

Hereinafter, the present invention will be explained according to the illustrated embodiment. In FIGS. 1 and 2, 1 is a handle for hitting a ball 2, 3 is a board surface with nails, and at the bottom thereof are ball inlet ports 4 arranged horizontally. is provided. 5 is a display window provided at the bottom of the nailing board surface 3. Reference numeral 6 denotes a large number of display units arranged horizontally in correspondence with each bulb introduction port 4, and on the front wall of each display unit 6, display sections 7 are arranged in five stages in the vertical direction, from the bottom to the fourth stage. The front surface of each display section 7 has a pattern of tiles of the same type, and the front surface of the fifth display section 7 has a display of out balls. Further, a ball receiving part 8 located directly below the ball introducing port 4 is vertically formed behind the display part 7, and five horizontal axes 9 are arranged equally in the vertical direction between the display part 7 and the ball receiving part 8. A rear part of a shielding plate 10, which is bent in an F-shape, is swingably supported on each of the horizontal shafts 9, which are protruded at intervals. The shielding plate 10 opens and closes each display section 7, and under normal conditions, its front part swings to a position where it blocks the front surface of the display section 7 due to its own weight, and when the ball 2 falls into the ball receiver 8, the ball 2 pushes down the rear end, and the front part swings to open the surface of the display section 7. Each shielding plate 10 from the bottom to the fourth stage
A magnet 11 is fixed to the upper surface of the central portion of each of the magnets. Reference numeral 12 denotes a magnetic element for detecting a magnetically sensitive ball constituted by a reed switch, which is connected to each display unit 6.
4 on the outer surface of the shielding plate 10 corresponding to the magnet 11 of each shielding plate 10.
When the shielding plate 10 is installed in several stages and is blocking the display part 7 with its front part, it is in the off state because it is in a position separated from the magnet 11, and the shielding plate 10 swings and the display part 7 is closed. When opened, the magnet 10 approaches and is turned on, so that the magnetic element 12 can detect the fall of the ball 2 into the corresponding ball receiver 8.

Reference numeral 13 denotes a pair of upper and lower magnet detectors, which are mounted on the upper and lower sides of the inside of the display window 5 at positions that are not affected by the magnet 11 and are not visible from the outside.
Note that the display window 5, display section 7, and other components close to the detector 13 are made of non-magnetic material. Magnet detector 1
3 is in the shape of a horizontally elongated rod that spans the entire width of the display window 5, and is wound almost over its entire length around a round bar-shaped core 14 made of soft iron as shown in FIG.
A secondary coil 15 and a secondary coil 1 wound around the outer circumference of an insulating bobbin 16 externally fitted onto the primary coil 15.
7, a commercial AC power source 18 is applied to both ends of the primary coil 15, and an output current I is taken out from both ends of the secondary coil 17. This detector 13 is designed so that the output current I can be easily reduced by an externally applied magnetic field by utilizing the magnetization characteristics of a ferromagnetic material. That is, as shown in Figure 4, the horizontal axis represents the magnetic field strength H, and the vertical axis represents the magnetic flux density B.
As is clear from the magnetization curve A, which depicts Since B is almost unchanged and reaches a saturated state, this fact is effectively utilized.The detector 13 has a smaller magnetic field by changing the material and thickness of the core 14, the winding method of the coils 15 and 17, etc. It is designed to be saturated by The output current I of the detector 13 is then input to a waveform shaper 19 as shown in FIG. The waveform shaper 19 calculates a shaped current I ₁ by extracting only the positive current from the value obtained by subtracting the reference current I ₀ from the output current I, and outputs this shaped current I ₁ via the amplifier 20. It is sent to circuit 21. The output circuit 21 outputs the shaping current
Determine the size of I ₁ , and if it is small, send an illegal magnet detection signal S
is sent to the output device 22. In response to the input of the illegal magnet detection signal S, the output device 22 operates, for example, to stop the operation of the mahjong ball machine or to issue an alarm, thereby preventing fraud by the magnet.

According to the configuration of the above embodiment, when the ball 2 launched by the handle 1 falls into the ball receiving portion 8, the shielding plate 1
0 rotates in the direction of arrow a, thereby exposing the corresponding display section 7 to the display window 5, and at the same time, the magnet 10 of the shielding plate 10 moves close to the ball detection magnetic element 12 of the corresponding stage, and When turned on, the ball detection magnetic element 12 detects the number of balls 2 falling into the ball receiving portion 8 . At this time, the magnet detector 13 is not affected by the magnet, and its output current I becomes like the solid line shown in FIG _.
Since the shaping current I ₁ obtained by subtracting is as _shown by the solid line shown in FIG.
If the player brings a strong magnet and brings it close to the ball detecting magnetic element 12 from the front of the display window 5, the ball detecting magnetic element 12 will be moved even when the ball 2 does not fall into the ball receiver 8. 12 malfunctions and turns on.
However, at this time, due to the influence of the magnet brought by the magnet detector 13, its output current I decreases as shown by the _dotted line in FIG. Since the rate of change in the output current I is magnified, the output circuit 21
determines that this shaping current I ₁ is reliably small and outputs an illegal magnet detection signal S to the output device 22 . The output device 22 stops the operation of the mahjong ball machine or issues an alarm to prevent fraud by the magnet.

In the above embodiment, the magnet detector 13 is provided inside the display window 5, but it may be provided outside as shown by the two-dot chain line in FIG.
It is preferable to attach a tube or the like to the outer periphery of the sparrow ball 3 so as to have the function of decorating the mahjong ball machine. Further, in the embodiment, the present invention is applied to a mahjong ball machine, but the present invention is not limited to this, and can be applied to a pachinko machine and other ball game machines.

According to the present invention, a primary coil to which AC power is applied and a secondary coil that generates an output current are installed inside and outside the same core near the ball detection magnetic element that detects the fall of a ball into the ball receiver. A magnet detector is provided, which is wound around a magnet, and can detect a magnet that causes the ball detection magnetic element to malfunction due to a decrease in the output current of the detector. If a magnetic element malfunctions, this can be easily detected by a fraudulent magnet detector, and fraud using magnets can be reliably prevented. Moreover, since the detector can be arranged in a long and narrow manner,
It has the advantage of being able to detect fraudulent magnets over a wide range with a single device, and can react to both the north and south poles of fraudulent magnets, and its practical effects are significant. be. Furthermore, since the magnet detector is arranged so that it does not operate with a magnet that moves due to a falling ball, the detector operates only with a magnet that causes the ball detection magnetic element to malfunction, and a legitimate magnet is replaced by an unauthorized magnet. There is no risk of false positive detection.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a sectional view of the same side, Figure 3 is a front view of the same magnet detector, and Figure 4 is a magnetization curve diagram for explaining the same magnet detector.
FIG. 5 is a block circuit diagram of the same, and FIG. 6 is a current waveform diagram for explaining the operation. 2...Ball, 8...Ball receiver, 11...Magnet, 12
... Magnetic element for ball detection, 13 ... Magnet detector, 1
4...Core, 15...Primary coil, 17...2
Next coil, 18...AC power supply.

Claims (1)

[Scope of utility model registration request] Corresponding to the ball receiver, a magnet that moves when the ball falls, and a ball detection magnetic element that operates when the magnet moves, so that the magnetic element detects the ball falling into the ball receiver. In the ball and bullet game machine, a magnetic detector is provided in which a primary coil to which an alternating current power is applied and a secondary coil to generate an output current are wound inside and outside of the same core in the vicinity of the ball detection magnetic element. A fraud prevention device for a ball and bullet game machine, characterized in that a magnet is provided so that the magnet does not operate, and a magnet that causes the ball detection magnetic element to malfunction due to a decrease in the output current of the detector can be detected.