Belt activate the alarm device

The utility model discloses a belt activate the alarm device, this belt connect on interval distribution's initiative cylinder and passive cylinder, and it still includes cam, jingle bell, push rod and gyro wheel, the cam with the initiative cylinder is coaxial fixed, the one end of push rod with gyro wheel roll connection, its other end is corresponding with the first position of the switch of jingle bell, wherein, the gyro wheel with the cam cooperatees, and the upper and lower both ends of push rod are equipped with fixed slide respectively, fixed slide for a plurality of movable pulleies are still installed to one side of push rod, and are a plurality of the movable pulley with push rod sliding contact. The utility model discloses a cam rotates the promotion push rod and moves right, and the touching bell stopping makes the jingle bell in time report to the police when the belt just starts to the staff that the messenger operated on the belt obtains reminding, withdraws rapidly, avoids the emergence of incident, guarantees staff's safety.