Coin selector for coin-operated machine and error detecting method against deceit in coin insertion

Abstract: A coin selector has a coin passageway where coins are inserted. A magnetic sensor inspects the coins through the coin passageway, and generates an inspecting signal, which a controller evaluates to generate an acceptant or unacceptant signal responsively. A gate plate responds to the acceptant or unacceptant signal, and provides two chutes selectively with the inspected coins. An accepting chute passes acceptable coins. A returning chute returns unacceptable coins. A photo sensor detects the acceptable coins through the accepting chute, and generates a detecting signal. Counters are adapted to counting, respectively, the acceptant signal in increment and the detecting signal in decrement. The controller adds together two counts of the counters, evaluates a sum of the addition, and generates an error signal in accordance with the sum evaluation. The error signal is utilized for implication of possible deceit or imposture of a player who inserts the coins.

Description: The present invention relates to a device for selecting coins of a predetermined kind and a method of detecting an error caused by deceit in insertion of coins through the same device. More particularly, the present invention relates to a coin selector applied to a coin-operated machine such as a gaming machine, and relates to an error detecting method against deceit in coin insertion through the same selector. A coin-operated machine is operated in response to insertion of a coin, token, medal or other disk (herein referred to as coin) into a coin inlet or passageway. As a coin-operated machine, there are known and widely used a slot machine, other gaming machines, a vending machine and a money-changing machine of a simple type. In a slot machine for example, an acceptable coin must be selected before a game can begin, in order to prevent the machine from operating by insertion of a wrong, phony, or unacceptable coin different from the genuine acceptable coin of one predetermined kind. To automate the selection of acceptable coins for the slot machine, there has been proposed a coin selector as illustrated in Fig. 6 of the accompanying drawings. In the conventional coin selector, a coin 9 is sensed through an inlet slot of the slot machine and passed along a coin passageway 10, which is communicated both with an accepting chute 11 and a returning chute 12. The coin 9 is detected two times: at a magnetic sensor 13 and a photo sensor 14. A gate plate 15 is swingable between a position where the coin 9 from the passageway 10 is passed to the accepting chute 11, and another position where the coin 9 is passed to the returning chute 12. An inspecting signal of the coin 9 is entered from the magnetic sensor 13 into a controller 16, and is evaluated as to whether it represents an acceptable or unacceptable coin. When the coin 9 is acceptable, the plate 15 is moved to the accepting position in actuation of a solenoid 17, so as to guide the acceptable coin 9 into the accepting chute 11. The acceptable coin 9 passes at the photo sensor 14 to cause it to output a detecting signal into the controller 16, which evaluates the detecting signal as to effectiveness. To conduct the latter evaluation, the controller 16 judges a time period T1 which begins at the acceptable inspecting signal and lapses at the detecting signal. When the detecting signal is judged as effective, the controller 16 actuates a slot machine mechanism 18. The player can play games corresponding to the number of coins inserted. The conventional coin selector however, suffers the disadvantage in being vulnerable to a foul play, imposture, or deceit. An imposter could make a foul play by use of a tool, as illustrated in Figure 7, for enabling him to play games more than the coins as he has played. A celluloid plate 19 of the tool is crooked in correspondence with the inside of the passageway 10, and is provided with three slots 19a to 19c in positions corresponding to the downstream sensor 14. The acceptable coin 9 as decoy is stuck or adhered to the celluloid plate 19 in the position corresponding to the upstream sensor 13. The coin 9 is evaluated as acceptable by the sensor 13 and the controller 16. The slots 19a to 19c are detected by the photosensor 14, cause the controller 16 to generate three detecting signals before lapse of T1 from the sensing of the coin 9 at the sensor 13, and are evaluated as effective three times. The use of the celluloid plate 19 at one time would enable the imposter to play three games without inserting any more coins. GB 2 121 579 discloses a coin validating apparatus in which a coin is detected both by a true coin sensor in the form of a coil sensor (16) and by an optical sensor (17). As the coin is pressed into the machine, it deflects an obturator plate 21 which, subsequently, is lifted to allow the coin to pass. The logic circuits monitor the output of the inductive coils and also the several outputs from the optical sensor and look for a certain sequence of outputs from these sensors in order to detect achieve final coin acceptance. In view of the foregoing problems,an object of the present invention is to provide a coin selector for a coin-operated machine in which the machine can be protected from a deceit or imposture of a player or user with no further mechanical construction, and an error detecting method in coin supply through the same selector. According to the present invention, there is provided a coin selector for selecting acceptable and unacceptable coins among coins as inserted into a coin passageway, comprising: an accepting chute arranged downstream from said coin passageway for passing said acceptable coin; a returning chute arranged downstream from said coin passageway for returning said unacceptable coin; an upstream sensor arranged in said coin passageway for inspecting said coins as passed through said coin passageway in order to generate an inspecting signal; judging means for evaluating said inspecting signal in order to generate an accept signal for said acceptable coin and a reject signal for said unacceptable coin; gate means for directing to said accepting chute inspected coins as passed through said coin passageway when said accept signal is generated, and for directing to said returning chute said inspected coins when said reject signal is generated; a downstream sensor for detecting said acceptable coin as passed through said accepting chute in order to generate a detecting signal; characterized by:- a first counter for counting said accept signal; a second counter for counting said detecting signal; and control means for processing counts of said first and second counters, for evaluating a processed result of said counts, and for generating an error signal in accordance with said evaluation of said processed result. The invention also provides a corresponding coin selection method. In accordance with the present invention, the coin-operated machine in use with the novel coin selector can be protected from possible fraudulent plays and no change or alteration of a mechanical structure of the conventional selector is required for constructing the novel coin selector. The present invention will be further described by way of example in the following detailed description when read in connection with the accompanying drawings, in which: Fig. 1 is a schematic view illustrating a novel coin selector; Fig. 2 is a timing chart illustrating an acceptable inspecting signal obtained from a magnetic sensor and a detecting signal from a photo sensor; Fig. 3 is a flow chart illustrating a main routine of the coin selector; Fig. 4 is a flow chart illustrating a routine for detecting an error in supply of coins; Fig. 5 is a flow chart illustrating a routine for inputting a setup of an allowable range; Fig. 6 is a schematic view illustrating a conventional coin selector; and Fig. 7 is a perspective view illustrating a tool for making a foul play. In Fig. 1 illustrating a novel coin selector, a coin passageway 10, into which a coin 9 is inserted through an inlet slot 10a of a slot machine 7, is communicated both with an accepting chute 11 and a returning chute 12. The chutes 11 and 12 further communicate to a hopper device (not shown) of the slot machine 7 and a coin tray or outlet 8, respectively. While respective reels of the slot machine 7 are rotated by the slot machine mechanism 18, the reels are stopped automatically or by manual operation of stop buttons. If the reels are stopped to show symbols in a window in a manner falling on such a combination of symbols as predetermined for a win, then the slot machine mechanism 18 causes the hopper device to pay out a predetermined number of coins into the coin tray 8. If the novel coin selector is adapted to a vending machine or the like, the accepting chute 11 communicates to a cash box instead of the hopper device. Inside the passageway 10 is arranged a magnetic sensor 13. Inside the accepting chute 11 is arranged a photoelectric sensor or photo sensor 14. There is arranged a gate plate 15 where the passageway 10 is branched to the chutes 11 and 12. The plate 15 is supported to be swingable between an accepting position where the coin 9 is allowed to pass from the passageway 10 to the accepting chute 11, and a home position or returning position where the coin 9 is passed from the passageway 10 to the returning chute 12. The magnetic sensor 13 is constituted of an oscillator and a receiver which are face to face arranged. When the coin 9 is passed between the oscillator and the receiver, the receiver of the sensor 13 generates an inspecting signal having such voltage that the wave of the signal corresponds the material and diameter of the coin 9. A controller 20 receives the inspecting signal from the magnetic sensor 13, and evaluates the material and the diameter of the coin 9 so as to generate an accept or unaccept signal for the inspected coin 9. The material of the coin 9 is detected according to the waveform of the inspecting signal, whereas the diameter of the coin 9 is detected according to the width of the inspecting signal. When and only when both material and diameter of the coin 9 are judged to be acceptable from the evaluation of the inspecting signal, a solenoid 17 is actuated for a predetermined period of time. In actuation of the solenoid 17, the plate 15 is moved to the accepting position so as to guide the acceptable coin 9 into the accepting chute 11. When the coin 9 is judged to be unacceptable by the magnetic sensor 13 and the controller 20, the solenoid 17 is inactive to keep the plate 15 in the returning position, so that the unacceptable coin is dropped into the returning chute 12. Note that the controller 20 also controls relevant circuits of a slot machine mechanism 18. The photo sensor 14 is constituted of a light projector and a light receiver facing each other on the inside of the accepting chute 11, and generates a detecting signal upon passing the coin 9 therethrough. The detecting signal from the photo sensor 14 is input to the controller 20, which evaluates the detecting signal as to effectiveness. To conduct this evaluation, the controller 20 judges a time period which begins at the inspecting signal and lapses at the detecting signal corresponding thereto. As illustrated in Fig. 2, a reference time period T1 is predetermined in correspondence both with the interval between the sensors 13 and 14 and with the expected velocity of the coin 9 passing between the sensors 13 and 14. It is judged that the detecting signal from the photo sensor 14 is effective when it is generated within the range of T1 from the inspecting signal of the magnetic sensor 13, and is ineffective when it is generated after the lapse of T1 from the inspecting signal of the magnetic sensor 13. Note that the waveform indicated with the broken line in Fig. 2 represents three pulses within T1. These pulses would be generated by the three slots 19a to 19c of the celluloid plate 19 (see Fig. 7) as a fraudster would use, should he try to defraud the downstream sensor 14 to sense as if three coins were accepted. While the controller 20 evaluates the inspecting signal from the magnetic sensor 13, an up counter 21 counts the number of the acceptable coins 9 as passed at the magnetic sensor 13 in accordance with the acceptable inspecting signal. The initial value of the up counter 21 is zero for example. Acceptant signals are counted in the up counter 21 in such increment as 1, 2, 3, and so on. When the detecting signal from the photo sensor 14 is entered in the controller 20, a down counter 22 counts the number of the acceptable coins 9 as passed through the accepting chute 11 in accordance with the detecting signal from the photo sensor 14. The initial value of the down counter 22 is zero for example. Detecting signals are counted in the down counter 22 in such decrement as -1, -2, -3, and so on. The controller 20 is connected to both counters 21 and 22, and adds up the counts obtained in the counters 21 and 22. Let C1 be the count of the up counter 21, and C2 be the count of the down counter 22. The controller 20 constantly monitors the sum of the addition of C1 and C2. Normally, the sum as stabilized of C1 and C2 equals zero, or nearly equals zero. When the controller 20 judges that the sum C1 + C2 is unequal to or somewhat different from zero, an error signal is generated by the controller 20. If the error signal were generated whenever the sum is not exactly zero a situation would be regarded as an error when the time interval between the inspection at the sensor 13 and the detection at the sensor 14 was slightly irregular within an allowable small range. In view of this, it is desirable to predetermine such a small range covering zero as to evaluate the sum of C1 and C2 to be no error, as described later in detail. When the error signal is generated, operation of the relevant mechanism 18 of the slot machine 7 is stopped and the controller 20 causes a display device 23 to display a warning indication to a player or user. To the controller 20 are connected a setup input unit 24 and a reset unit 25. The setup input unit 24 is manually operable to input values to predetermine the above small range covering zero. A changeover switch 24a is operated to select either of the normal mode and a setup input mode. In the setup input mode through the switch 24a, upper and lower limits of the small range are inputted to the controller 20. The reset unit 25 is manually operable to reset the relevant mechanism 18 and the coin selector including the display 23, when the relevant mechanism 18 is stopped and the warning indication is displayed in the display 23. The operation of the coin selector is now described with reference to flow charts in Figs. 3 to 5. The setup input mode is selected through the changeover switch 24a. The upper limit A and the lower limit B for the sum of C1 and C2 of the counters 21 and 22 are entered as intended by an operator, before selecting the normal mode again through the changeover switch 24a. The coin selector is then ready for insertion of the coin 9 into the slot machine 7. The coin 9 as inserted through an inlet slot 10a is passed at the magnetic sensor 13, which generates the inspecting signal representing information of the material and diameter of the coin 9. The inspecting signal is evaluated by comparison with the reference information predetermined in the controller 20. When the coin 9 is judged acceptable, then the solenoid 17 is actuated for the predetermined period to guide the coin 9 to the accepting chute 11. In response to one acceptable inspecting signal, the controller 20 outputs one pulse as acceptant signal to the up counter 21 to cause it to count the coins 9 as passed at the magnetic sensor 13. The coin 9 passes through the photo sensor 14 afterwards. The photo sensor 14 generates the detecting signal at each passage of the coin 9. The detecting signal is evaluated by the controller 20 to be effective or ineffective. The evaluation, as seen in Fig. 2, judges the detecting signal as effective when the detecting signal is generated at or before the lapse of T1 after the generation of the acceptable inspecting signal. Only when effectiveness is judged from evaluation, the controller 20 sends the effective signal to the slot machine mechanism 18. The controller 20 outputs the effective signal to the down counter 22, which is caused to count the coins 9 as passed through the photo sensor 14. After generation of the effective signal, it is judged whether an error flag has been set or not. When and only when no error flag exists, the flow returns to the initial routine. The controller 20 constantly monitors the sum C1 + C2 according to the counters 21 and 22 with reference to the upper and lower limits A and B as determined through the setup input unit 24. When C1 + C2 becomes A or over A, or B or below B, then the error flag is set. Setting of the error flag causes the display 23 to show a warning indication, and stops the slot machine mechanism 18. It is determined for example that A is 5, B is -2. Suppose all the inserted coins be regarded as acceptable. Upon passage of the coins 9 at the magnetic sensor 13, C1 of the up counter 21 is changed to be 1, 2, 3 and so on. Before passage of the coins 9 through the photo sensor 14, C2 of the down counter 22 is still zero. Upon passage of the coins 9 through the photo sensor 14, C2 is changed to be -1, -2, -3 and so on. Each coin 9 passes from the sensor 13 to the sensor 14 by taking time of 100 msec or less, during which C1 + C2 increases 1, 2, 3 and so on initially. After the coins 9 are passed through the photo sensor 14, C1 + C2 decreases to be 3, 2, 1 until zero in a stable condition. In brief, successive insertion of the coins 9 brings C1 + C2 temporarily over zero. Note that the passageway 10 and the accepting chute 11 are so shaped that there can be a small number of coins, e.g. two or three, which have passed the upstream sensor 13 but not the downstream sensor 14 yet, during their passage through the coin selector. The sum C1 + C2 corresponds to the number of the successive coins running between the sensors 13 and 14, but is allowed only to be below the upper limit A. No error flag is set within the allowed range below A, except for an accidental state such that too many coins take place and jam between the sensors 13 and 14. In view of this, A is determined preferably 3, 4, 5, or the like. In fair play, there is no possibility that C1 + C2 comes below zero. When C1 + C2 is -2 or below, the warning indication is immediately displayed upon setting the error flag, because C1 + C2 of at most -2 implies that a fraudulent insertion has occurred by use of the tool, which, as illustrated in Fig. 7, could cause the downstream sensor 14 to generate three effective signals at once. Determination of B as -2 could be somewhat tolerant toward fraud, because it allows acceptance of only one unacceptable coin. Alternatively, B may be determined -1 so that a fraudster can be discovered and arrested immediately upon his fraudulent play. The present invention is also advantageous in invalidation of another type of fraudulent play, by using an acceptable decoy coin and a thread for suspending the coin. In a conventional coin selector, an impostor could insert the suspended coin to the position of the upstream sensor 13, actuate the sensor 13 to close the swingable plate 15, and insert other individual coins through the passageway 10 into the accepting chute 11. In the present invention, such an impostor can be discovered easily, because C1 + C2 comes also below zero. Although the coin 9 is inspected by the magnetic sensor 13 and detected by the photo sensor 14 according to the present embodiment, yet two sensors of other construction as well-known in the art may be adapted to inspection and detection of the coin 9. Although the count C1 of the up counter 21 and the count C2 of the down counter 22 are added together in the present embodiment, two up counters may be used and their counts may be subtracted one from another. Two down counters may be used and their counts may be subtracted one from another. Although the coin selector as described according to the above embodiment is used in the slot machine 7, the coin selector may also be applied in other gaming machines, vending machines, money-changing machine, or coin-operated machines of any kind, for use with a predetermined single kind of coin, token, medal or other disk. Although the present invention has been fully described by way of the preferred embodiments thereof with reference to the accompanying drawings, various changes and modifications will be apparent to those having skill in this field and such changes and modifications are intended to fall within the scope of the present invention as defined by the appended claims.

Claims: A coin selector for selecting acceptable and unacceptable coins among coins (9) inserted into a coin passageway (10), comprising: an accepting chute (11) arranged downstream from said coin passageway for passing said acceptable coin; a returning chute (12) arranged downstream from said coin passageway for returning said unacceptable coin; an upstream sensor (13) arranged in said coin passageway for inspecting said coins as passed through said coin passageway in order to generate an inspecting signal; judging means (20) for evaluating said inspecting signal in order to generate an accept signal for said acceptable coin and a reject signal for said unacceptable coin; gate means (15,17) for directing to said accepting chute (11) inspected coins as passed through said coin passageway (10) when said accept signal is generated, and for directing to said returning chute (12) said inspected coins when said reject signal is generated; a downstream sensor (14) for detecting said acceptable coin as passed through said accepting chute in order to generate a detecting signal; characterized by:- a first counter (21) for counting said accept signal; a second counter (22) for counting said detecting signal; and control means (20) for processing counts (C1, C2) of said first and second counters (21,22), for evaluating a processed result of said counts, and for generating an error signal in accordance with said evaluation of said processed result. A coin selection method for detecting an error in coin supply in a coin selector for selecting acceptable and unacceptable coins among coins (9) inserted into a coin passageway (10) and including: an accepting chute (11) arranged downstream from said coin passageway for passing said acceptable coin; a returning chute (12) arranged downstream from said coin passageway for returning said unacceptable coin; gate means (15,17) for selectively directing inspected coins as passed through said coin passageway (10) to said accepting chute (11) or to said returning chute (12); and control means (20); said method comprising the steps of: inspecting said coins passed through said coin passageway in order to generate an inspecting signal; evaluating said inspecting signal, in order to generate an accept signal for said acceptable coin, and a reject signal for said unacceptable coin; operating said gate means (15,17) to direct to said accepting chute (11) said inspected coins passed through said coin passageway when said accept signal is generated; operating said gate means (15,17) to direct to said returning chute (12) said inspected coins when said reject signal is generated; detecting said acceptable coin passed through said accepting chute in order to generate a detecting signal; counting said accept signal using a first counter (21); counting said detecting signal using a second counter (22); and in the control means (20):- processing counts (C1, C2) of said accept signal and said detecting signal; evaluating a processed result (C1 + C2) of said counts (C1, C2); and generating an error signal in accordance with said evaluation of said processed result. A coin selector as defined in claim 1 or selection method according to claim 2, wherein said error signal is generated for information that a detection through said accepting chute (11) lacks corresponding inspection through said coin passageway (10), and is adapted to indicate possible deceit by a user who inserts said coins. A coin selector according to claim 1 or 3 when dependent therefrom, wherein said upstream sensor (13) senses at least a diameter of said coins (9). A coin selector according to claim 1 or 3 or 4, when dependent therefrom, wherein: said upstream sensor is a magnetic sensor (13) and senses material of said coins; and said downstream sensor is a photoelectric sensor (14). A coin selector according to claim 1 or 3 to 5, when dependent therefrom or a selection method according to claim 2 or 3, when dependent therefrom, wherein said gate means (15,17) closes said returning chute (12) when said accept signal is generated, and closes said accepting chute (11) when said reject signal is generated. A coin selector according to claim 1 or 3 to 6, when dependent therefrom or a selection method according to claim 2 or 3, when dependent therefrom, wherein: said first counter (21) counts said accept signal in increment; said second counter (22) counts said detecting signal in decrement; said processed result is a sum (C1 + C2) of said counts (C1, C2); and said control means (20) generates said error signal when said sum is equal to or less than a reference value (B). A coin selector or selection method according to claim 7, wherein said reference value (B) is a negative integer near to zero. A coin selector or selection method according to claim 7 or 8, wherein said reference value (B) is -2. A coin selector or selection method according to claim 7, 8 or 9, wherein said control means (20) generates said error signal further when said processed result (C1 + C2) is equal to or more than a positive reference value (A), as information that an inspection of an acceptable coin (9) through said coin passageway (10) lacks corresponding detection through said accepting chute (11), to warn of possible jamming of said coins. A coin selector as defined in claim 10, wherein said positive reference value (A) is determined in consideration of an interval between said upstream and downstream sensors (13,14). A coin selector according to claim 1, or any of claims 3 to 11 when dependent therefrom, or a selection method according to claim 2 or any of claims 3 or 6 to 11 when dependent therefrom, wherein said control means (20) further monitors time points of generation of said inspecting and detecting signals, and allows said second counter (22) to count, when said detecting signal is generated within a predetermined period (T1) after said inspecting signal. A coin selector according to claim 1 or any of claims 3 to 12 when dependent therefrom or a selection method according to claim 2 or any of claims 3 or 6 to 12 when dependent therefrom, wherein said gate means (15,17) includes a swingable plate (15) and a solenoid (17) for swinging said plate (15) in response to said accept and reject signals from said control means. A coin selector according to claim 1 or any of claims 3 to 13 when dependent therefrom or a selection method according to claim 2 or any of claims 3 or 6 to 13 when dependent therefrom, further comprising display means (23) for displaying a warning indication to an exterior in response to generation of said error signal from said control means (20). A coin operated machine including a coin selector according to claim 1 or any claim dependent therefrom, wherein said coin selector is adapted to operate according to the method of claim 2 or any claim dependent therefrom, the machine including means for stopping operation when said error signal is generated. A coin operated machine according to claim 15, including means for resetting it after being stopped by said error signal.

Inventors: KUROSU MAKOTO, KUROSU, MAKOTO, Kurosu, Makoto, c/o Universal Technous Co., Ltd.
Applicants: UNIVERSAL SALES CO LTD, UNIVERSAL SALES CO., LTD.
Application year: 1992
Main classification: G07F3
IPC codes: G07D5, G07F1