| 摘要 |
PURPOSE:To permit the comparison with high accuracy in the finishing work by providing an amplification rate calculation part which calculates and instructs the amplification rate of an amplification part on the basis of the set threshold value or the working load signal and a threshold value calculation part which calculates the set threshold value according to the amplification rate of the amplification part. CONSTITUTION:When the set threshold value (p) or the detected working load signal (l) is small, the amplification rate (k) of an amplification part 12 is increased, and when the set threshold value (p) or the detected working load signal (l) is large, the amplification rate (k) of the amplification part 12 is reduced. The threshold value Q is calculated in a threshold value calculation part 17 according to the adjusted amplification rate (k), and the threshold value Q and the working load signal L amplified in the amplification part 12 are compared in a comparison part 14. Therefore, the comparison with high accuracy is permitted in the finishing work, needless to say in the rough working. |
