| 摘要 |
<p>An operator (10) for moving movable elements, such as roll-up shutters or the like, comprises a reduction gear (11) and a limit switch device (12). The limit switch device (12) has two detecting sensors (13, 14), each corresponding to one of two end movement positions to be detected and which are associated with cursors (21, 22) coupled with a threaded movement bar (20). For running a procedure for setting the point of the limit switch for one of the sensors automatically, there is provided deactivating means (23) for deactivating the detection of the corresponding cursor for the sensor and arresting means (24) for arresting the movement of the corresponding cursor to the sensor at the point of normal detection thereof by the sensor.</p> |
