| 摘要 |
PROBLEM TO BE SOLVED: To surely detect two-sheet feed of corrugated cardboard. SOLUTION: A pair of a transmitter 10 and a receiver 11 are provided so as to hold the corrugated cardboard 2. The direction of an ultrasonic wave 1 transmitted from the transmitter 10 is inclined by an angle C in the horizontal direction from a direction A for supplying the corrugated cardboard 2 and is inclined by an angle B' from the surface of a surface liner 3. |
