| 摘要 |
PURPOSE:To enable meaurement of the thickness of a tube regardless of deformation in the sectional shape thereof, by arranging plate springs supporting a sensor movable in a radial direction independent of each other to support a sensor support portion in such a manner as to freely oscillate circumferentially. CONSTITUTION:A probe 2 is made up of a front plate spring 21 and a rear plate spring 22 as holding means fastened on both sides of a guide member 11, a support bar 23 having a sensor 13 mounted thereon, an intermediate plate spring 24 composing a support means of the sensor 13 together therewith and a coil spring 25 adapted to energize the support bar 23 outward radially. Then, plate springs 21 and 22 are provided with eight each of arms 21a and 22a extended radially and are engaged with both ends 24a and 24b of the plate spring 24. The engagement is loose in the connection with an engaging pawl and allows circumferential oscillation of a tube 1 within a range of chattering thereof. The support bar 23 is somewhat energized outward radially with the plate spring 24 and the plate springs 21 and 22 and further done with the coil spring 25 outward in a radial way. In this manner, a roller 14 of the probe 2 is pressed securely on the inner wall of the tube. |
