| 摘要 |
PROBLEM TO BE SOLVED: To control speed of a door opened and closed by a weight at power source cutoff time, and prevent generation of impact by arranging a spring type electromagnetic brake in a double-wing automatic door device for an elevator car. SOLUTION: When a power source of a door driving electric motor 5 is cut off, in a spring type electromagnetic brake 4, an electromagnet 6 is released, and a brake shoe 7 is pressed against a doorway frame by force of a spring 9, and a door moved by a weight 3 is braked by frictional force. A driving pulley to transmit gravity of the weight 3 or a door towing belt may be braked. Therefore, impact is prevented from being generated since the door is excessively accelerated by the weight 3. In a door opening detecting electric contact point device 8, a shock absorbing material such as rubber is laminated under a conductive metallic tape as a fixed contact point, or a metallic brush composed of a conductive metallic needle is used, and an actuating sound of the electric contact point device is reduced. |
