| 摘要 |
PURPOSE:To provide a positive and safe stoppage of an operation in case of occurrence of trouble by a method wherein the number of troubles generated within a specified period of time is detected in reference to a time measurement and a counting of troubles and the operation is stopped only when the number of troubles is more than the specified number of times. CONSTITUTION:Detected signals of various trouble sensors 1 to 4 are inputted to a trouble counting means 6 and then the number of occurrence of troubles is counted. In turn, time ranging from an initial occurrence of trouble to a measuring time is measured by time measuring means 7. An operation stopping means 8 may receive a measuring time and the number of troubles. In case that the troubles of more than a specified number of times are generated within a specified period of time, the operation is terminated. With this arrangement, an erroneous discrimination of trouble is not present and a positive stoppage can be assured. |
