| 摘要 |
<p>An automatic-door lock system in which an endless belt running round a driving pulley driven by an electric motor and a driven pulley spaced apart from the driving pulley, comprises: means for issuing a pulse signal proportionate to a speed of a door member; an automatic door controller which receives the pulse signal to determine the condition of the door member in its position, travel direction and speed on the basis of the pulse signal, and numerically controls the electric motor; a lock mechanism for locking the door member, the lock mechanism having an electromagnet element which is so energized as to attract the driven pulley to its stationary member to make it possible to lock up the door member; and an electromagnetic lock controller for permitting a current to flow through the electromagnet element at a time when the automatic door controller determines that the speed of the door member is reduced to zero in a closing area of the door member.</p> |
