| 摘要 |
PURPOSE:To exactly obtain a detection value even in case when a bending angle is different in the front and the rear, by constituting so that a detecting operation is executed by making two detecting devices rise simultaneously in the front and the rear of a drag. CONSTITUTION:A movement driving device 9 is fixed to the center position of the front and the rear of a web 7 by cutting out the web 7. Probes 13 provided to the tip parts of right and left detectors 11 have such functions as follow spring-up of a sheet metal by a spring, convert a spring-up following distance which has set the same level as the upper surface of a drag to zero, to an electric signal, and transmit it to a computer. In the inside of parallel links 15 having the same size and the same shape, which have been separated in the upper and lower parts on the right and left of the detector housing and have been installed to the shaft, the right and left detectors are pinned to a driving shaft 17, and the driving shaft 17 is fastened to a helical gear 19 in the inside end which has pierced through the web 7. Also, in each outsde of the detectors 11, the other end of the parallel link is connected freely turnably around a fixed shaft 21. When the driving shaft 17 is turned countercloskwise in the figure, the detectors 11 occupy each prescribed position exactly in the upper and lower directions and on the right and left, in the rear of the drag. |
