| 摘要 |
A yarn inspector has three detecting circuits, one for detecting major defects, one for detecting minor defects and one for detecting the number of defects per unit length. The sensitivity of each of the defect detecting circuits can be set by means of digitally reading manually operable disc-type switches. A photosensor responsive to yarn defects is connected to all three detecting circuits. After amplification of the signal from the photosensor, a selected value representing the prevailing noise level is subtracted from the amplified signal. The remainder, representing a defect signal without noise, is further amplified to provide an output signal which is used to indicate and record the defect and, if desired, stop the warper or other machine with which the yarn inspector is used. Controls are provided on the front panel for setting the sensitivity of the detecting circuits and also for setting the number of defects, the unit length and the speed of the yarn being inspected. A single meter is provided with a selector switch to permit checking the inspection during operation and also testing and calibrating the inspector when the yarn is stopped. |
