| 摘要 |
<p>PURPOSE:To report an abnormality and to recover this abnormality by deciding whether a natural action is carried out in response to a trigger operation and carrying out again the trigger operations in the prescribed frequency after a prescribed time if the natural action is not carried out. CONSTITUTION:In a TV display open system, for example, a display caught by a pawl 3 and kept in a fixed state is triggered. Thus the fixed state of the display is released and the display drops by its gravity. At the same time, an open driver 2 produces a trigger to release the catching state of the pawl 3 under the control of a controller 1. Meanwhile a sensor 4 detects the end of the opening action of the display and reports this fact to the controller 1. The controller 1 decides whether the retrying operations are already repeated in the prescribed frequency as long as the driver 2 is turned on and the display is not opened even after a prescribed time. If the repetitive retrying operations are not carried out, the operations of the driver 2 are repeated. Then an abnormality is recovered when the retrying operations are repeated in the prescribed frequency.</p> |
