PURPOSE:To realize excellent operability and safety in protection by providing a slide lid for opening and closing a bank note incoming and outgoing port and the second locking mechanism for locking a cassette mainframe to a housing section. CONSTITUTION:By inserting a cassette mainframe 1 into a cassette housing section, a cam C is inserted into the mainframe 1, put in contact with a horizontal link 35 to protrude a regulating piece 52 and locked to an engagement hole 54. By turning a key to the direction of an arrow mark (a) at the key insertion section 32 of the second locking mechanism, a vertical link 34 is locked to a fixing member 55 via a turn regulating plate 33 and at the same time an engaging member 18 is ready to move and a slide lid 6 is put into a movable condition to the direction of an arrow mark (b), so that a note delivery port 16 in the upper mainframe 2 is open and communicates with a rejected bank note receive port 27. That is, money payment is allowed only when the cassette mainframe 1 is inserted into the housing section and locked to the cassette housing section, and in such a state locking to the cassette housing section is secured by the vertical link 34 and the regulating plate 52, then to keep safety in protection and enable mounting only through operation of the second locking mechanism.
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