| 摘要 |
PURPOSE:To prevent an incorrect discrimination by measuring the position of a hermetically sealed container lid at its center and two points apart from each other by a prescribed spacing by an electromagnetic sensor and discriminating defective or nondefective by the degree of an unevenness wherein a correcting value within a prescribed range is added to a measured value. CONSTITUTION:Distance signals S1 corresponding to distances, for example, to six cans C1-C6 to be inspected which are accommodated in a corrugated board box 101 in an array are outputted from a vortex distance sensor 104 arranged above a conveyor 102. On the other hand, the pulse generator 107 of a conveyor driving shaft generates read pulses S2 for three measuring points for the cans C1-C6. A correcting signal S6 from a correcting value setting unit 118 is added to an output signal S4 corresponding to the degree of the unevenness of a can lid and derived from the signals S1 to obtain a corrected unevenness degree signal S7. The signal S7 is compared with a value S8 set to a discriminating level setting unit 120 and discriminated in a signal comparator 121 and a signal indicative of deflective product is generated under the condition of S7<S8.
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