CONTROL DEVICE OF ELEVATOR DOOR

PURPOSE:To conduct a highly reliable feedback control by disposing a detecting means for detecting the door motor speed and door position in a speed reducer situated within a door machine case. CONSTITUTION:The rotation of a door motor 4 is decelerated through a pulley 16, a belt 3, a pulley 14 supported by a bearing 15, a sprocket 12, a chain 2, and a pulley 9 supported by a bearing 10 to conduct the opening and closing of a door. The bearings 15, 10 are fixed to a door machine case 1. An encoder slit plate 26 and an encoder pulse detecting part 25 are disposed on the other end of the rotating shaft of the pulley 14 and sprocket 13 and on the opposite bearing 15 side, respectively, to detect the speed of the door motor 4 and the door position simultaneously without having the effect of the temperature increase of the door motor 4, and also detect the door position precisely without having the effect of slipping of the belt 3. Hence, a precise and highly reliable feedback control of the door opening and closing can be carried out.