US Patent 7992688 Door device for an elevator

A door device for an elevator includes an elevator door, first and second door drive devices having first and second rotating shafts, respectively, a power transmission mechanism that moves the elevator door according to rotation of the first and second rotating shafts, and a door control device that controls movement of the elevator door. The door control device includes a first processing device that performs first arithmetic processing for controlling the first door drive device, a second processing device that performs second arithmetic processing for controlling the second door drive device, and an information transmitting unit for information transmission between the first and second processing devices.