CONTROL DEVICE FOR MOTOR-DRIVEN BLIND

PURPOSE:To control operation of a blind certainly by a method wherein the operation of the blind is made with a single and a master controller while data for raising and lowering positions and angles of slats are stored in a memory, and the operation of the blind is controlled by turning a stepping motor. CONSTITUTION:As a raising key 41a is operated when a blind 1 is in the state of stoppage, an MPU generates driving pulses, and thereby a stepping motor 13 starts in normal rotation. Then, an up-and-down/ladder drum 5 is rotated, making an up-and-down cord 7 ascend, and thereby the blind 1 is raised. As a lowering key 41b is operated when the blind 1 is also in the state of stoppage, the stepping motor 13 starts in reverse rotation, making the up-and-down cord 7 descend, and thereby the blind l is lowered. As a stop key 43 is operated while the blind 1 is in up-and-down operation and in operation for working slats, the MPU stops generation of driving pulses, making the stepping motor 13 stop, and thereby up-and-down operation of the blind 1 stops, or turning of the slats 9 stops. In case of power failure, turning of the slats 9 is prevented by operation of an electromagnetic brake 15.