PURPOSE: To prevent an acoustic buzzer from sounding when a door for maintenance man is opened by a regular maintenance man, but sound loudly for alarming when the door is opened by a person other then the maintenance man.
CONSTITUTION: This device is equipped with operation switches 4a, 4b, and 4c which can be operated while the door for maintenance is opened and an optical display unit 5 which displays inputs of the operation switches 4a-4c and a password code is previously stored, and, when a code inputted to the operation switches 4a-4c matches the stored password code for T seconds from the arrival of information from a door switch 1 which indicates that the door for maintenance is opened, a sounding control signal is inhibited from being sent out to make the acoustic buzzer 2 not sound. The acoustic buzzer is inhibited from sounding in a time zone wherein shop clerks are present and made to sound when the door for maintenance is opened while the power source is turned off, and it is made possible to easily mount the device on an existent automatic vending machine.
SAKAI TOSHIHIKO