| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent fraudulent action which inserts a fraudulent instrument in a token charge port and falsely operates a detection sensor. Ž<P>SOLUTION: In a slot machine, when a downstream side sensor detects a token in a state in which the number of credits is 49, that is, the downstream side sensor detects a creditable last token, the downstream side sensor moves toward a second position on the downstream side from a first position on an upstream side in such a way as following the token. Then when the downstream side sensor cannot detect tokens after the movement starts before it reaches the second position, it is determined that fraudulent action has been performed and it is notified of. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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