| 摘要 |
PURPOSE:To detect the tip of steel material quickly and accurately by setting a threshold level from a noise signal before the passage of the steel material from an accelerometer provided on a bearing of a conveying roller. CONSTITUTION:An output of acceleration 3 is taken out when a conveying roller 4 reaches specified revolutions thereof while the lifting, turning and rotating thereof are completed before the tip of a steel material 1 reaches the roller 4. This output is fed to a peak value hold circuit 9 as noise signal transmitted from an accelerometer 3 before the passage of the steel material. Based on an output L0 of the hold circuit 9, a threshold level La is set for a comparator 10. As soon as the tip of the steel material comes in contact with the roller 4, an output P of the accelerometer 3 is generated to the comparator 10. Thus, the tip of the steel material can be detected quickly and accurately. |
