| 摘要 |
PURPOSE:To alarm co-rising of a paper draining material by a method in which a driving reference pulse is compared with a remaining position depth pulse and when the interval of the remaining position depth pulse is great, a signal is sent out by a comparator, and the signal is put in an alarm device to send out alarm signals. CONSTITUTION:By a drive depth meter 5, when a driver tool 1 is driven to a given depth, on the basis of the pisition, the position of the tip of the tool 1 for every unit length when pulled out is detected and then the detected value is sent out as a drive reference pulse signal 6. When pulling out the tool 1, the leaving state of the draining material 2 is verified by sensing plural objectes 4 to be detected, attached to the draining material 2, by the sensor 3, and the value is sent out as a remaining position depth pulse signal 7. Voltage level signals of two pulse signals 6 and 7 are put in a comparator 11 for comparison, and when the interval of the signal 7 is larger than that of the signal 6, the draining material 2 is regarded as being co-risen. Then, anomalous signal 12 is sent out and then an alarm signal 14 is sent out. |
