SAFETY DEVICE AND SAFETY CONTROL METHOD FOR PASSENGER CONVEYOR

PROBLEM TO BE SOLVED: To detect the travelling speed of a user with accuracy not varying even in conditions of receiving direct sunlight in the daytime, receiving afternoon sun in the evening, and of a less light amount at night and to constitute a safety device. SOLUTION: The travel of users on plane coordinates is measured by laser scan sensors 1a, 1b arranged in the vicinity of an entrance and exit of a passenger conveyor scanning of the laser scanning sensors. When the travelling speed of the users is below a predetermined value, attention attracting announcement is broadcast by a voice synthesizer 11 and speakers 12a, 12b, and in case of a prolonged staying or crowding state of users, the generated frequency and voltage of an inverter device 8 are controlled to lower the speed of a driving motor 9 or to stop the motor. COPYRIGHT: (C)2009,JPO&INPIT