| 摘要 |
PURPOSE:To increase the yield rate of a product, by measuring the distance from a reference line to a straight tube part and to a tube end part of the tube body by using two sensors, and indicating an appropriate cutting position. CONSTITUTION:An AC signal from a generator 31 is supplied to coils of distance measuring sensors 12 and 13 through amplifiers 32 and 33. The tube body 11 is a conductor, and eddy currents are generated in response to magnetic flux generated in the coils. Based on these currents, the sensor 12 detects the distance to the straight tube part of the tube body, and the sensor 13 detects the distance to the bent part of the tube end. An operating circuit 34 obtains the curvatures from the difference between both distances. The operating circuit also obtaines the curvature at each part of the tube body from the position signal in the longitudinal direction of the tube body from a sensor 35 and the position signal of the rotating direction of the tube body from the sensor 36, compairs the results with a preset value, and determines the cutting part of the tube body. |
