| 摘要 |
PURPOSE:To apply fail-safe function in case where a trouble is generated on sensors for composing a joy stick, by setting a means for checking input from a pair of the sensors for generating output according to reciprocal operation. CONSTITUTION:When a joy stick 2 is switched from 'front' to 'rear' and when the return of the output of a front side operating sensor 2A is poor, then output is generated from both sensors 2A, 2B; and both input existence discriminating means 5A, 5B judge that input exists. By accepting this judgement a logic discriminating means 6 judges that an abnormal state exists, and an output stopping means 7 stops command from speed command converting means 3A, 3B, fed to an actuator 4. Besides, when the joy stick 2 is returned to 'neutral' and input from both the sensors 2A, 2B comes to nothing, then the logic discriminating means 6 judges that no abnormal state exists and stop the working of the output stopping means 7. |
